Science.gov

Sample records for aplicados al analisis

  1. On random walk de Lévy aplicado aos mapas de variâncias

    NASA Astrophysics Data System (ADS)

    Klafke, J. C.

    2003-08-01

    Uma pergunta que surge ao nos confrontarmos com os mapas de variâncias, ou s-Maps [Klafke, J. C. "Estudo da Difusão Caótica em Ressonâncias Asteroidais", Tese de Doutorado, IAG/USP, 2002] diz respeito ao conteúdo físico de tais representações do espaço de fase. Ou seja, o que representa as variâncias das ações obtidas para uma determinada condição inicial e como relacioná-las com o tempo de difusão das órbitas, supondo-se que estas de fato estejam envolvidas em um processo difusivo? Para discutirmos essa questão, lançamos mão da modelagem dos processos estocásticos subjacentes às variâncias determinadas e implementamos uma série de simulações do tipo Monte Carlo a partir das informações registradas nos s-Maps calculados para algumas ressonâncias asteroidais bem estudadas (p.ex. 3: 1, 2: 1 e 3: 2). Para tanto, temos usado uma função de densidade de probabilidade gaussiana ao definir os n passos que permitirão estabelecer uma relação direta entre o Mapa de Difusão e o Mapa de Variâncias. Contudo, os resultados obtidos até agora tem subestimado o tempo de difusão esperado para os fenômenos conhecidos. Tal se deve ao fato de que, no processo difusivo real, é possível existirem passos de comprimento consideravelmente maiores que a média estabelecida pelas distribuições gaussiana ou normal, sobretudo quando se cruza uma região caótica. Neste trabalho, apresentamos os resultados comparativos de simulações de Monte Carlo com base no random walk de Lévy [Klafter, J. et al. 2002. "Beyond Brownian motion", Phys. Today, Feb, 33-39.], o qual possibilita passos esporádicos de comprimento acima do valor médio (saltos) permitindo estabelecer uma escala de tempo mais próxima da esperada para a difusão.

  2. Revision curricular a partir de un analisis comparativo de las discrepancias en los curriculos de una escuela de optometria en Puerto Rico con las competencias requeridas para las agencias de revalida y acreditacion 2004

    NASA Astrophysics Data System (ADS)

    Rivera Pacheco, Andres

    El proposito de esta investigacion, un estudio cualitativo de caso, fue comparar y contrastar el curriculo vigente de la Escuela de Optometria de la UIAPR con las competencias y estandares requeridos por las agencias de acreditacion y de revalida. Con este proposito, decidimos realizar una revision y un analisis de documentos: el prontuario de cada uno de los cursos de los curriculos implantados en el 1993 y en el 2001; las competencias y estandares establecidos por las agencias de revalida y de acreditacion; y las estadisticas en las que se analiza el porcentaje de estudiantes que aprueban cada una de las partes de los examenes de revalida entre el 1998 al 2003. Se realizaron entrevistas dirigidas para dar apoyo y complementar la revision y el analisis de estos documentos. Los participantes de las entrevistas fueron tres estudiantes de la clase de optometria del 2004 (ultima clase del curriculo del 1993); tres estudiantes de la clase de optometria del 2005 (primera clase graduanda del curriculo vigente) y tres profesores y/o directores de los Departamentos de Ciencias Basicas, Ciencias Clinicas y Cuidado al Paciente. Esta investigacion se enmarco en el modelo de evaluacion curricular de discrepancia de Malcolm Provus y en el modelo de desarrollo basado en competencias. Uno de los hallazgos mas importantes del estudio es que los cambios que se implantaron al curriculo del 2001 no han logrado que los estudiantes mejoren su ejecucion en los examenes de revalida. Por otro lado, se encontro que el curriculo vigente atiende completamente los estandares de la practica de Optometria, pero no las competencias. Esta informacion fue validada mediante el uso de una tabla de cotejo para el analisis de los cursos y de la informacion obtenida de las entrevistas. El estudio determina y concluye que existen discrepancias entre los prontuarios de los cursos del curriculo y las competencias requeridas por la agencia de revalida. Segundo, que el Departamento de Ciencias Basicas es el que presenta mas deficiencias en el desarrollo de las competencias. El investigador recomienda disenar e implantar un curriculo basado en competencias y proveer formacion en didactica y procesos de aprendizaje a los profesores.

  3. Diagnosing ALS

    MedlinePLUS

    ... ChallengeALS About This Site Site Map Link Policy Privacy Policy Pay tribute to those fighting ALS with a ... the National Office . Site Map | Press Room | FAQ | Privacy Policy | Link Policy | RSS | Contact Us The ALS Association - ...

  4. ALS - resources

    MedlinePLUS

    Resources - ALS ... The following organizations are good resources for information on amyotrophic lateral sclerosis : Muscular Dystrophy Association -- mda.org/disease/amyotrophic-lateral-sclerosis National Amyotrophic Lateral Sclerosis (ALS) Registry -- ...

  5. Al Composites

    NASA Astrophysics Data System (ADS)

    Chandanayaka, Tharaka; Azarmi, Fardad

    2014-05-01

    In the present study, cold spraying technique was used to fabricate a metal matrix composite (MMC) that consists of Ni matrix and 20 vol.% Ni3Al particles at two different particle sizes as reinforcement. This study intends to investigate the effect of reinforcement particle size on microstructural and mechanical properties of cold sprayed MMCs. Two different Ni3Al powders with nominal particle size of -45 to +5 and +45 to 100 ?m were used as reinforcement in this study. Cold sprayed Ni-Ni3Al samples were subjected to the microstructural observation and characterization prior to any mechanical testing. Then, samples were tested using nano-indentation, Knoop hardness, Vickers hardness, and Resonance frequency to evaluate their mechanical properties. No significant changes were observed in microstructural characteristics due to different particle sizes. The results obtained from a variety of mechanical testings indicated that the increasing reinforcement particle size resulted in the slight reduction of mechanical properties such as elastic modulus and hardness in cold sprayed MMCs. The mechanical interlock between deposited particles defines the bonding strength in cold sprayed samples. Small size particles have a higher velocity and impact resulting in stronger interlock between deformed particles.

  6. [Analoghi sintetici dell'ormone di rilascio dell'ormone luteinizzante per il trattamento del carcinoma prostatico localmente avanzato o metastatico: analisi dei costi diretti e indiretti nello scenario italiano].

    PubMed

    Fadda, Valeria; Maratea, Dario

    2015-12-01

    Riassunto. Introduzione. Gli analoghi sintetici dell'ormone di rilascio dell'ormone luteinizzante (Lh-Rh) sono utilizzati per diverse indicazioni cliniche. I dati di outcome non riportano differenze significative in termini di efficacia tra i diverse analoghi di sintesi Lh-Rh. Materiali e metodi. La ricerca di letteratura è stata eseguita inserendo le seguenti parole chiave nelle biblioteche biomediche online (PubMed) e nei database online delle Agenzie regolatorie (EMA e FDA): "LHRH agonist AND prostatic cancer", "androgen deprivation therapy", "androgen suppression", "buserelin", "leuprorelin", "goserelin", "triptorelin", "degarelix". Nei costi diretti sono stati inclusi i costi relativi alle visite specialistiche di controllo, il costo dell'esame del PSA e il costo del farmaco. Tra i costi indiretti sono stati inclusi le giornate lavorative perse dal paziente. Risultati. Considerando lo schema terapeutico intermittente per tutti i farmaci considerati, il costo di trattamento più basso è attribuibile alla formulazione di Eligard 22,5 mg mentre la spesa più alta si registra con la somministrazione di Firmagon. Quando però vengono considerati anche i costi di accesso ospedaliero dovuti alla necessaria presenza di un operatore, la terapia meno costosa è rappresentata da Suprefact depot. Conclusioni. La presente analisi dimostra che il prezzo di acquisto del farmaco non può, da solo, rappresentare la spesa come unico determinante della stessa. A carico del Servizio Sanitario è infatti necessario imputare anche i costi associati alle visite specialistiche, agli accessi ambulatoriali e al tempo impiegato dall'operatore, necessari nel caso in cui per la somministrazione del farmaco sia obbligatoria la presenza di un operatore. PMID:26780073

  7. /Cu-Al System

    NASA Astrophysics Data System (ADS)

    Kish, Orel; Froumin, Natalya; Aizenshtein, Michael; Frage, Nachum

    2014-05-01

    Wettability and interfacial interaction of the Ta2O5/Cu-Al system were studied. Pure Cu does not wet the Ta2O5 substrate, and improved spreading is achieved when relatively a high fraction of the active element (~40 at.% Al) was added. The Al2O3 and AlTaO4 phases were observed at the Ta2O5/Cu-Al interface. A thermodynamic evaluation allowed us to suggest that the lack of wetting bellow 40 at.% Al is due to the presence of a native oxide, which covers the drop. The conditions of the native oxide decomposition and the formation of the volatile Al2O suboxide strongly depend on the vacuum level during sessile drop experiments and the composition of the Cu-Al alloy. In our case, Al contents greater than 40% provides thermodynamic conditions for the formation of Al2O (as a result of Al reaction with Al2O3) and the drop spreading. It was suggested that the final contact angle in the Ta2O5/Cu-Al system (50°) is determined by Ta adsorption on the newly formed alumina interlayer.

  8. Initial Symptoms of ALS

    MedlinePLUS

    ... world without ALS Start an Event Combine your passion and commitment to finding a cure for ALS while achieving ... 1275 K Street NW - Suite 250 - Washington, DC 20005 All content and works posted on this website are owned and copyrighted ...

  9. Who Gets ALS?

    MedlinePLUS

    ... world without ALS Start an Event Combine your passion and commitment to finding a cure for ALS while achieving ... 1275 K Street NW - Suite 250 - Washington, DC 20005 All content and works posted on this website are owned and copyrighted ...

  10. MDA ALS Caregiver's Guide

    MedlinePLUS

    ... MDA Partners in Progress Search form Search MDA ALS Caregiver's Guide March 2013 Download a printable PDF ... probably because someone you care about deeply has ALS. This guide will help you to help your ...

  11. Analisis del contenido curricular de los Documentos Normativos del Programa de Ciencias en el area de biologia para la escuela superior del sistema de educacion publica de Puerto Rico: 1993-2012

    NASA Astrophysics Data System (ADS)

    Davila Montanez, Melissa

    Esta investigacion de naturaleza cualitativa se ocupo de realizar un analisis de contenido documental de los Documentos Normativos del Programa de Ciencias en el area de biologia de la escuela superior del sistema de educacion publica de Puerto Rico del periodo 1993-2012. Los documentos analizados fueron: Guia Curricular, 1995; Marco Curricular, 2003; Estandares de Excelencia, 1996, 2000 y Estandares de Contenido y Expectativas de Grado, 2007. Se indago si hubo cambios en significados en los Componentes Estructurales: Naturaleza de la ciencia, Paradigmas para la ensenanza de la ciencia, Funcion del curriculo formal, Mision de la ensenanza de la ciencia; Contenidos, destrezas y competencias, Estrategias de ensenanza y Evaluacion/Assessment del aprendizaje. El analisis sugiere que no hubo cambios sustanciales en los significados de los Componentes Estructurales. Los documentos estudiados muestran mayormente caracteristicas similares, aunque los documentos mas recientes eran mas descriptivos, explicativos y especificos.

  12. Analisis de Alteraciones EN la Imagen Debidas a Descolimacion de un Telescopio

    NASA Astrophysics Data System (ADS)

    Cobos, F. J.; Galan, M. J.

    1987-05-01

    Podemos considerar, en términos generales, que los espejos de un telescopio tienen una calidad óptica intrínseca, entendiendo por ésta la que se ha obtenido como resultado, fundamentalmente, de la destreza del personal del Taller Optico, que considerará terminadas las superficies ópticas cuando éstas satisfagan los requisitos de diseño y las pruebas de evaluación pertinentes. Debemos esperar que, una vez instalados los espejos en el telescopio, no se altere esta calidad de la óptica por un funcionamiento inadecuado de partes mecánicas del mismo. En los últimos años, en la medida que los problemas de infraestructuratura de nuestros Observatorios se han ido resolviendo, se ha hecho más patente la necesidad de llevar a la instrumentación existente al máximo de su potencial y parte esencial de ésta la conforman los mismos te lescopios. Mejorar la calidad óptica de las imágenes obtenidas con ellos ha hecho que sea prioritario el realizar una investigación más sistemática de sus características. Este trabajo ha tenido como objetivo primordial el usar un programa de diseño óptico, en el caso particular del telescopio UNAM212, con el fin de calcular y obtener gráficamente los diagramas de manchas de imagenes en foco y extrafocales, tanto con la óptica perfectamente alineada como descolimándola (mediante pequenos giros y descentramientos de los espejos). De esta manera, se hizo una evaluación de los efectos que estas alteraciones simuladas producirían en las imágenes focales y extra focales para así poder compararlas con las que realmente se han observado. Asimismo, se ha buscado información bibliográfica, en particular sobre los efectos de giros y descentramientos en las imágenes extrafocales, en lo que se ref iere a la falta de concentricidad de los círculos que forman la "dona" y a la distribución de intensidad luminosa en la misma. De ésta, l futuro un proceso que, haciendo uso de los detectores bidimensionales, nos permita Ilevar a cabo una alineación más rigurosa de la óptica del telescopio y evaluar con precisión Si variaciones en el posicionado del misesperamos desarrollar en emo producen efectos de descolimación.

  13. Ventilatory Control in ALS

    PubMed Central

    Nichols, Nicole L.; Van Dyke, J.; Nashold, L.; Satriotomo, I.; Suzuki, M.; Mitchell, G.S.

    2015-01-01

    Amyotrophic lateral sclerosis (ALS) is a fatal, progressive neurodegenerative disease. ALS selectively causes degeneration in upper and lower (spinal) motor neurons, leading to muscle weakness, paralysis and death by ventilatory failure. Although ventilatory failure is generally the cause of death in ALS, little is known concerning the impact of this disorder on respiratory motor neurons, the consequences of respiratory motor neuron cell death, or the ability of the respiratory control system to “fight back” via mechanisms of compensatory respiratory plasticity. Here we review known effects of ALS on breathing, including possible effects on rhythm generation, respiratory motor neurons, and their target organs: the respiratory muscles. We consider evidence for spontaneous compensatory plasticity, preserving breathing well into disease progression despite dramatic loss of spinal respiratory motor neurons. Finally, we review current and potential therapeutic approaches directed toward preserving the capacity to breathe in ALS patients. PMID:23692930

  14. [Environmental factors in ALS].

    PubMed

    Juntas-Morales, Raul; Pageot, Nicolas; Corcia, Philippe; Camu, William

    2014-05-01

    ALS is likely to be a disorder of multifactorial origin. Among all the factors that may increase the risk of ALS, environmental ones are being studied for many years, but in the recent years, several advances have pointed to a new interest in their potential involvement in the disease process, especially for the cyanotoxin BMAA. Food containing BMAA has been found on Guam, a well-known focus of ALS/parkinsonism/dementia and high levels of BMAA have been identified into the brain of these patients. The BMAA cyanotoxin is potentially ubiquitous and have also been found into the food of patients who died from ALS both in Europe and USA. BMAA can be wrongly integrated into the protein structure during mRNA traduction, competing with serine. This may induce abnormal protein folding and a subsequent cell death. Heavy metals, such as lead or mercury may be directly toxic for neuronal cells. Several works have suggested an increased risk of ALS in individuals chronically exposed to these metals. Exposure to pesticides has been suggested to be linked to an increased risk of developing ALS. The mechanism of their toxicity is likely to be mediated by paraoxonases. These proteins are in charge of detoxifying the organism from toxins, and particularly organophosphates. To date, there are insufficient scientific data to suggest that exposure to electromagnetic fields may increase the risk of having ALS. We are particularly missing longitudinal cohorts to demonstrate that risk. PMID:24703731

  15. ALS2 mutations

    PubMed Central

    Schneider, Susanne A.; Carr, Lucinda; Deuschl, Guenther; Hopfner, Franziska; Stamelou, Maria; Wood, Nicholas W.; Bhatia, Kailash P.

    2014-01-01

    Objective: To determine the genetic etiology in 2 consanguineous families who presented a novel phenotype of autosomal recessive juvenile amyotrophic lateral sclerosis associated with generalized dystonia. Methods: A combination of homozygosity mapping and whole-exome sequencing in the first family and Sanger sequencing of candidate genes in the second family were used. Results: Both families were found to have homozygous loss-of-function mutations in the amyotrophic lateral sclerosis 2 (juvenile) (ALS2) gene. Conclusions: We report generalized dystonia and cerebellar signs in association with ALS2-related disease. We suggest that the ALS2 gene should be screened for mutations in patients who present with a similar phenotype. PMID:24562058

  16. Genetic Testing for ALS

    MedlinePLUS

    ... Involved Donate Familial Amyotrophic Lateral Sclerosis (FALS) and Genetic Testing By Deborah Hartzfeld, MS, CGC, Certified Genetic ... guarantee a person will develop symptoms of ALS. Genetic Counseling If there is more than one person ...

  17. All About ALS

    MedlinePLUS

    ... External link, please review our exit disclaimer . Subscribe All About ALS Understanding a Devastating Disorder In the ... a coffee pot, or button a shirt. Eventually, all muscles under voluntary control are affected, and people ...

  18. MDA ALS Caregiver's Guide

    MedlinePLUS

    ... for an official diagnosis of FTD. Most people’s perceptions of “dementia” include the dramatic memory loss, confusion ... for those with ALS. The seat’s width and depth adjustments are indexed and clearly marked for a ...

  19. What Is ALS?

    MedlinePLUS

    ... scarring or hardening ("sclerosis") in the region. Motor neurons reach from the brain to the spinal cord ... the body. The progressive degeneration of the motor neurons in ALS eventually leads to their demise. When ...

  20. About ALS: FAQ

    MedlinePLUS

    ... Hall of Fame basketball player George Yardley , pro football player Glenn Montgomery , golfer Jeff Julian , golf caddie ... in physical therapy, speech, occupational therapy, nursing, psychology, social work, nutrition and other fields, the ALS neurologist ...

  1. Leakage current behaviors of Al/ZrO2/Al and Al/YSZ/Al devices

    NASA Astrophysics Data System (ADS)

    Yeh, Tsung-Her; Lin, Ruei-De; Cherng, Bo-Ruei; Cherng, Jyh-Shiarn

    2015-01-01

    The leakage current behaviors of Al/ZrO2/Al and Al/yttria stabilized zirconia (YSZ)/Al devices are investigated for resistive random access memory (RRAM) applications. A silicon oxide layer (450 nm) is first formed on a Si wafer by thermal oxidation. Onto it an Al bottom electrode (270 nm), a ZrO2 or YSZ nano-film (75 nm), and an Al top electrode (270 nm) are sequentially deposited by sputtering. These RRAM devices exhibit ohmic behaviors in the low-field region, while Schottky and Poole-Frenkel emissions take over in the high-field regions. Both the Schottky and trap barrier levels are decreased when monoclinic ZrO2 is replaced by cubic YSZ in the metal/oxide/metal structure. This is attributed not only to the higher symmetry crystal structure and lower binding energy of YSZ, but also to the formation of more oxygen vacancies and their re-distribution associated with yttria doping.

  2. Frequently Asked Questions about ALS and the ALS Registry

    MedlinePLUS

    ... long do people with familial ALS live? Do clusters of ALS possibly exist? (I have been told ... related?) What are the problems with studying possible clusters of ALS? What are motor neuron (nerve cell) ...

  3. ALS superbend magnet performance

    SciTech Connect

    Marks, Steve; Zbasnik, John; Byrne, Warren; Calais, Dennis; Chin, Michael; DeMarco, Richard; Fahmie, Michael; Geyer, Alan; Krupnick, Jim; Ottens, Fred; Paterson, James A.; Pipersky, Paul; Robin, David S.; Schlueter, RossD.; Steier, Christoph; Wandesforde, Alan

    2001-12-10

    The Lawrence Berkeley National Laboratory has been engaged in the design, construction and testing of four superconducting dipoles (Superbends) that are installed in three arcs of the Advanced Light Source (ALS), with the fourth magnet as a spare. This represents a major upgrade to the ALS providing an enhanced flux and brightness at photon energies above 10 keV. In preparation for installation, an extensive set of tests and measurements have been conducted to characterize the magnetic and cryogenic performance of the Superbends and to fiducialize them for accurate placement in the ALS storage ring. The magnets are currently installed, and the storage ring is undergoing final commissioning. This paper will present the results of magnetic and cryogenic testing.

  4. Fosetyl-al

    Integrated Risk Information System (IRIS)

    Fosetyl - al ; CASRN 39148 - 24 - 8 Human health assessment information on a chemical substance is included in the IRIS database only after a comprehensive review of toxicity data , as outlined in the IRIS assessment development process . Sections I ( Health Hazard Assessments for Noncarcinogenic Ef

  5. Al Shanker Remembers.

    ERIC Educational Resources Information Center

    American Educator, 2000

    2000-01-01

    In a 1996 interview shortly before his death, Al Shanker, longtime president of the American Federation of Teachers, discussed such topics as: his own educational experiences; how he learned about political fighting in the Boy Scouts; the appeal of socialism; multinational corporations and the nation state; teaching tough students; and John Dewey…

  6. Al Shanker Remembers.

    ERIC Educational Resources Information Center

    American Educator, 2000

    2000-01-01

    In a 1996 interview shortly before his death, Al Shanker, longtime president of the American Federation of Teachers, discussed such topics as: his own educational experiences; how he learned about political fighting in the Boy Scouts; the appeal of socialism; multinational corporations and the nation state; teaching tough students; and John Dewey…

  7. Modelo de accesibilidad de conceptos matematicos aplicados en el curso de Astronomia Descriptiva para estudiantes con impedimentos visuales en la UPR

    NASA Astrophysics Data System (ADS)

    Isidro Villamizar, Gloria Maria

    Este estudio utiliza metodologia de investigacion cualitativa, con el proposito de describir, analizar y evaluar los procesos de diseno y desarrollo de un modelo de accesibilidad que consiste en estrategias de ensenanza de las matematicas para estudiantes con impedimentos visuales matriculados en el curso de Astronomia Descriptiva en la UPR. Se utilizaron las siguientes estrategias para recopilar la informacion, 1) reflexiones de la investigadora en el proceso de diseno y desarrollo de las lecciones adaptadas, que se registraron en un diario reflexivo. 2) entrevista semiestructurada luego de haber trabajado las lecciones de aprendizaje adaptadas con los participantes. 3) observaciones y notas de la investigadora del trabajo de los participantes. Para obtener la informacion de los participantes se obtuvo los permisos institucionales necesarios; se seleccionaron los participantes y se validaron los instrumentos; se realizo el desarrollo de las lecciones adaptadas con los participantes; y finalmente, se analizo la informacion obtenida. El diseno de las lecciones de aprendizaje adaptadas se hizo siguiendo las recomendaciones curriculares de los temas de matematicas aplicados en el curso de Astronomia Descriptiva realizado por la investigadora durante su semestre de internado. El testimonio de las voces de los participantes se obtuvo del proceso de desarrollo de las lecciones de aprendizaje adaptadas de temas seleccionados de conceptos matematicos requeridos en el curso de Astronomia Descriptiva y de la entrevista semiestructurada con los participantes, luego de haber trabajado las lecciones de aprendizaje. Para el desarrollo de las lecciones de aprendizaje, se utilizaron materiales tactiles adaptados, materiales tactiles disenados y materiales disponibles comercialmente. Los textos de las lecciones se imprimieron en tinta y en Braille. Se exhorta a disenar y desarrollar estrategias de ensenanza accesibles, considerando como recursos para evaluar su efectividad a personas con impedimentos visuales. El utilizar estrategias de aprendizaje accesibles de acuerdo a las necesidades individuales de los estudiantes, contribuye para que los estudiantes con impedimentos visuales descubran, exploren, investiguen y formulen sus propias conclusiones durante su proceso de aprendizaje.

  8. /Al-Si Composite

    NASA Astrophysics Data System (ADS)

    Li, Wei; Chen, Jian; Hu, Yongle; Cong, Li; Sun, YouPing; Yang, JiMing

    2014-08-01

    The cyclic fatigue characteristics of spray-deposited SiCp/Al-Si composite were investigated in comparison with the unreinforced Al-Si alloy. The as-extruded specimens were cyclically deformed with fully reversed loading under a range of total strain amplitudes. The results show that the cyclic response characteristics for the reinforced and unreinforced materials are similar to each other. Both the composite and matrix alloys display cyclic hardening under total strain amplitude of 0.35-0.5%. Otherwise, the composite exhibits higher degree of strain hardening than that of the matrix alloy. Dislocation substructure developed during cyclic deformation was analyzed using transmission electron microscopy. The discrepancy between dislocation substructures obtained from processing compared to its development during cyclic strain loading is thought to give rise to the observed cyclic stress response behavior. Fractographic analysis shows that particle/matrix debonding and particle cracking are the main mechanisms of failure in the SiC particle-reinforced composite.

  9. ALS Project Management Manual

    SciTech Connect

    Krupnick, Jim; Harkins, Joe

    2000-05-01

    This manual has been prepared to help establish a consistent baseline of management practices across all ALS projects. It describes the initial process of planning a project, with a specific focus on the production of a formal project plan. We feel that the primary weakness in ALS project management efforts to date stems from a failure to appreciate the importance of ''up-front'' project planning. In this document, we present a guide (with examples) to preparing the documents necessary to properly plan, monitor, and control a project's activities. While following the manual will certainly not guarantee good project management, failure to address the issues we raise will dramatically reduce the chance of success. Here we define success as meeting the technical goals on schedule and within the prescribed budget.

  10. ALS insertion devices

    SciTech Connect

    Hoyer, E.; Chin, J.; Halbach, K.; Hassenzahl, W.V.; Humphries, D.; Kincaid, B.; Lancaster, H.; Plate, D.

    1990-11-01

    The Advanced Light Source (ALS), the first US third generation synchrotron radiation source, is currently under construction at the Lawrence Berkeley Laboratory. The low-emittance, 1.5 GeV electron storage ring and the insertion devices are specifically designed to produce high brightness beams in the UV to soft X-Ray range. The planned initial complement of insertion devices includes four 4.6 m long undulators, with period lengths of 3.9 cm, 5.0 cm (2) and 8.0 cm, and a 2.9 m long wiggler of 16 cm period length. Undulator design is well advanced and fabrication has begun on the 5.0 cm and 8.0 cm period length undulators. This paper discusses ALS insertion device requirements; general design philosophy; and design of the magnetic structure, support structure/drive systems, control system and vacuum system. 18 refs., 9 figs., 5 tabs.

  11. Jasechko et al. reply.

    PubMed

    Jasechko, Scott; Sharp, Zachary D; Gibson, John J; Birks, S Jean; Yi, Yi; Fawcett, Peter J

    2014-02-13

    replying to A. M. J. Coenders-Gerrits et al. 506, http://dx.doi.org/10.1038/nature12925 (2014)In their Comment, Coenders-Gerrits et al. suggest that our conclusion that transpiration dominates the terrestrial water cycle is biased by unrepresentative input data and optimistic uncertainty ranges related to runoff, interception and the isotopic compositions of transpired and evaporated moisture. We clearly presented the uncertainties applied in our Monte-Carlo sensitivity analysis, we reported percentile ranges of results rather than standard deviations to best communicate the nonlinear nature of the isotopic evaporation model, and we highlighted that the uncertainty in our calculation remains large, particularly in humid catchments (for example, figure 2 in our paper). PMID:24522604

  12. Al Jazirah, Sudan

    NASA Technical Reports Server (NTRS)

    2008-01-01

    Al Jazirah (also Gezira) is one of the 26 states of Sudan. The state lies between the Blue Nile and the White Nile in the east-central region of the country. It is a well populated area suitable for agriculture. The area was at the southern end of Nubia and little is known about its ancient history and only limited archaeological work has been conducted in this area. The region has benefited from the Gezira Scheme, a program to foster cotton farming begun in 1925. At that time the Sennar Dam and numerous irrigation canals were built. Al Jazirah became the Sudan's major agricultural region with more than 2.5 million acres (10,000 km) under cultivation. The initial development project was semi-private, but the government nationalized it in 1950. Cotton production increased in the 1970s but by the 1990s increased wheat production has supplanted a third of the land formerly seeded with cotton.

    The image was acquired December 25, 2006, covers an area of 56 x 36.4 km, and is located near 14.5 degrees north latitude, 33.1 degrees east longitude.

    The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

  13. Al(+)-ligand binding energies

    NASA Technical Reports Server (NTRS)

    Sodupe, M.; Bauschlicher, Charles W., Jr.

    1991-01-01

    Ab initio calculations are used to optimize the structure and determine the binding energies of Al(+) to a series of ligands. For Al(+)-CN, the bonding was found to have a large covalent component. For the remaining ligands, the bonding is shown to be electrostatic in origin. The results obtained for Al(+) are compared with those previously reported for Mg(+).

  14. Studies of 27Al NMR in EuAl4

    NASA Astrophysics Data System (ADS)

    Niki, H.; Nakamura, S.; Higa, N.; Kuroshima, H.; Toji, T.; Yogi, M.; Nakamura, A.; Hedo, M.; Nakama, T.; ?nuki, Y.; Harima, H.

    2015-03-01

    EuAl4 orders antiferromagnetically at TN ? 16 K with an effective magnetic moment of 8.02 ?B. In the paramagnetic phase, the magnetic susceptibility of EuAl4 follows the Curie-Weiss law with a positive Curie-Weiss temperature ?P = +14 K. The antiferromagnetic state is changed into the field induced ferromagnetic state at a critical field Hc of approximately 2 T. In order to microscopically investigate the magnetic and electronic properties in EuAl4, the NMR measurements of EuAl4 have been carried out at temperatures between 2 and 300 K, applying an external magnetic field of approximately 6.5 T. The 27Al NMR spectra corresponding to Al(I) and Al(II) sites are obtained. From the 27Al NMR spectra, the isotropic part Kiso and anisotropic part Kaniso of Knight shift, and nuclear quadrupole frequncy ?Q are obtained. The Kiso and Kaniso shift to negative side with decreasing temperature due to the RKKY interaction. These temperature dependences follow the Curie-Weiss law with ?P = +14 K, which is consistent with that of the magnetic susceptibility. From the K - ? plot, the values of the hyperfine fields Hhf_iso and Hhf_aniso are -3.231 and -0.162 kOe/?B for Al(I) site, and -1.823 and -0.264 kOe/?B for Al(II) site, respectively. The values of ?Q of 27Al nucleus for Al(I) and Al(II) sites are approximately 0.865 and 0.409 MHz, respectively. The nuclear relaxation time T1 of 27Al NMR for both sites is almost constant in the paramagnetic phase, while the value of 1/T1 is abruptly decreased in the ordered ferromagnetic state.

  15. Growth and Optical Properties of Al rich AlN/AlGaN Quantum Wells

    NASA Astrophysics Data System (ADS)

    Tahtamouni, T. M. Al; Nepal, N.; Nakarmi, M. L.; Lin, J. Y.; Jiang, H. X.

    2006-03-01

    Al rich AlGaN alloys are promising materials for the applications in the optoelectronic devices such as deep ultraviolet (UV) emitters and detectors in the spectral range down to 200 nm. AlGaN based UV emitters (?<340nm) has applications in bio-chemical agent detection and medical research/ health care. To realize deep UV emission (?< 280 nm) Al rich AlGaN based quantum wells (QWs) are required. We report here the growth of AlN/AlxGa1-xNQWs (x>0.65) on AlN/sapphire templates by metalorganic chemical vapor deposition (MOCVD). Deep UV photoluminescence (PL) was employed to study the optical properties of the QWs. Well width (Al composition) dependence was studied by varying the QW thickness (Al composition) with fixed x ˜ 0.65 (well width at 3 nm). Optical properties of these QWs such as the effects of alloy fluctuation, temperature, strain and piezoelectric field, carrier and exciton localizations on the quantum efficiency have been studied. Carrier and exciton dynamics were probed. Implications of our findings on the applications of Al rich AlN/AlGaN QWs for UV emitters and detectors will also be discussed.

  16. Theoretical studies of AlF, AlCl, and AlBr

    NASA Technical Reports Server (NTRS)

    Langhoff, Stephen R.; Bauschlicher, Charles W., Jr.; Taylor, Peter R.

    1988-01-01

    Spectroscopic constants have been obtained for the lowest six singlet and lowest five triplet states of AlF and AlCl. The results suggest that the correct ordering of the triplet manifold in these molecules is: a 3Pi, b 3Sigma(+), c 3Sigma(+), d 3Pi, and e 3Delta. Radiative lifetimes have been determined for the excited states, and the A 1Pi to X 1Sigma(+) transition in AlF, AlCl, and AlBr has been examined in detail. A-X transition moment functions, Einstein coefficients, and A 1Pi vibrational lifetimes have been obtained for AlF and AlCl.

  17. Rub' al Khali, Arabia

    NASA Technical Reports Server (NTRS)

    2008-01-01

    The Rub' al Khali is one of the largest sand deserts in the world, encompassing most of the southern third of the Arabian Peninsula. It includes parts of Oman, United Arab Emirates, and Yemen. The desert covers 650,000 square kilometers, more than the area of France. Largely unexplored until recently, the desert is 1000 km long and 500 km wide. The first documented journeys made by Westerners were those of Bertram Thomas in 1931 and St. John Philby in 1932. With daytime temperatures reaching 55 degrees Celsius, and dunes taller than 330 meters, the desert may be one of the most forbidding places on Earth.

    The image was acquired December 2, 2005, covers an area of 54.8 x 61.9 km, and is located near 20.7 degrees north latitude, 53.6 degrees east longitude.

    The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

  18. Interfacial reactions and oxidation behavior of Al 2O 3 and Al 2O 3/Al coatings on an orthorhombic Ti 2AlNb alloy

    NASA Astrophysics Data System (ADS)

    Li, H. Q.; Wang, Q. M.; Gong, J.; Sun, C.

    2011-02-01

    The uniform and dense Al2O3 and Al2O3/Al coatings were deposited on an orthorhombic Ti2AlNb alloy by filtered arc ion plating. The interfacial reactions of the Al2O3/Ti2AlNb and Al2O3/Al/Ti2AlNb specimens after vacuum annealing at 750 °C were studied. In the Al2O3/Ti2AlNb specimens, the Al2O3 coating decomposed significantly due to reaction between the Al2O3 coating and the O-Ti2AlNb substrate. In the Al2O3/Al/Ti2AlNb specimens, a ?-TiAl layer and an Nb-rich zone came into being by interdiffusion between the Al layer and the O-Ti2AlNb substrate. The ?-TiAl layer is chemically compatible with Al2O3, with no decomposition of Al2O3 being detected. No internal oxidation or oxygen and nitrogen dissolution zone was observed in the O-Ti2AlNb alloy. The Al2O3/Al/Ti2AlNb specimens exhibited excellent oxidation resistance at 750 °C.

  19. Characteristics of CeCoIn5/Al/AlOx/Nb and CeCoIn5/Al/AlOx/Al Tunnel Junctions

    SciTech Connect

    Petrovic, C.; Nevirkovets, I.P.; Chernyashevskyy, O.; Hu, R.; Ketterson, J.B.; Sarma, B.K.

    2009-03-03

    We report characteristics of CeCoIn{sub 5}/Al/AlO{sub x}/Nb and CeCoIn{sub 5}/Al/AlO{sub x}/Al tunnel junctions fabricated on the (0 0 1) surface of CeCoIn{sub 5} crystal platelets. The main result of this work is the observation of a low Josephson current (as compared with that expected from the Ambegaokar-Baratoff formula), which is consistent with idea that the order parameter in the heavy-fermion superconductor CeCoIn{sub 5} has unconventional pairing symmetry.

  20. Medical application of 26Al

    NASA Astrophysics Data System (ADS)

    Steinhausen, C.; Gerisch, P.; Heisinger, B.; Hohl, Ch.; Kislinger, G.; Korschinek, G.; Niedermayer, M.; Nolte, E.; Dumitru, M.; Alvarez-Brückmann, M.; Schneider, M.; Ittel, T. H.

    1996-06-01

    Accelerator mass spectrometry (AMS) measurements with 26Al as tracer were performed in order to study the aluminium metabolism and anomalies in the human body and in rats. In particular, the differences between healthy volunteers and patients with renal failure were investigated. The obtained data points of 26Al in blood and urine were described by an open compartment model with three peripheral compartments. It was found that the minimum of peripheral compartments needed to describe 26Al concentrations in blood and urine over a time period of three years is at least three.

  1. Understanding ALS: new therapeutic approaches.

    PubMed

    Musarò, Antonio

    2013-09-01

    Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease associated with motor neuron degeneration, muscle atrophy and paralysis. Although numerous pathological mechanisms have been elucidated, ALS remains an invariably fatal disease in the absence of any effective therapy. The heterogeneity of the disease and the failure to develop satisfactory therapeutic protocols reinforce the view that ALS is a multi-factorial and multi-systemic disease. Thus, a better understanding of the pathogenic mechanisms and study of the potential pathological relationship between the various cellular processes is required to ensure efficacious therapy. The pathogenic mechanisms associated with ALS are reviewed, and the strengths and limitations of some new therapeutic approaches are discussed. PMID:23217177

  2. Reply to Fischer et al.

    PubMed

    Watson, Stuart K; Townsend, Simon W; Schel, Anne M; Wilke, Claudia; Wallace, Emma K; Cheng, Leveda; West, Victoria; Slocombe, Katie E

    2015-11-01

    We welcome the correspondence from Fischer and colleagues regarding our recent paper on vocal learning in chimpanzee food grunts [1]. Fischer et al. make two challenges to our paper's conclusions, which we address here. PMID:26528741

  3. Reply to Gopalswamy et al.

    NASA Technical Reports Server (NTRS)

    Cane, H. V.; Richardson, I. G.

    2003-01-01

    The comment of Gopalswamy et al. (thereafter GMY) relates to a letter discussing coronal mass ejections (CMEs), interplanetary ejecta and geomagnetic storms. GMY contend that Cane et al. incorrectly identified ejecta (interplanetary CMEs) and hypothesize that this is because Cane et al. fail to understand how to separate ejecta from "shock sheaths" when interpreting solar wind and energetic particle data sets. They (GMY) are wrong be cause the relevant section of the paper was concerned with the propagation time to 1 AU of any potentially geoeffective structures caused by CMEs, i.e. upstream compression regions with or without shocks, or ejecta. In other words, the travel times used by Cane et al. were purposefully and deliberately distinct from ejecta travel times (except for those slow ejecta, approx. 30% of their events, which generated no upstream features), and no error in identification was involved. The confusion of GMY stems from the description did not characterize the observations sufficiently clearly.

  4. In memory of Al Cameron

    NASA Astrophysics Data System (ADS)

    Cowan, John; Truran, James W.

    Al Cameron, who died recently (October 3, 2005) at 80, was one of the giants in astrophysics. His insights were profound and his interests were wide-ranging. Originally trained as a nuclear physicist, he made major contributions in a number of fields, including nuclear reactions in stars, nucleosynthesis, the abundances of the elements in the Solar System, and the origin of the Solar System and the Moon. In 1957, Cameron and, independently, Burbidge, Burbidge, Fowler and Hoyle, wrote seminal papers on nuclear astrophysics. Most of our current ideas concerning ele- ment formation in stars have followed from those two pioneering and historical works. Al also made many contributions in the field of Solar System physics. Particularly noteworthy in this regard was Cameron's work on the formation of the Moon. Al was also a good friend and mentor of young people. Al Cameron will be missed by many in the community both for his scientific contributions and for his friendship.

  5. Transcranial magnetic stimulation in ALS

    PubMed Central

    Floyd, A G.; Yu, Q P.; Piboolnurak, P; Tang, M X.; Fang, Y; Smith, W A.; Yim, J; Rowland, L P.; Mitsumoto, H; Pullman, S L.

    2009-01-01

    Objective: To investigate transcranial magnetic stimulation (TMS) measures as clinical correlates and longitudinal markers of amyotrophic lateral sclerosis (ALS). Methods: We prospectively studied 60 patients with ALS subtypes (sporadic ALS, familial ALS, progressive muscular atrophy, and primary lateral sclerosis) using single pulse TMS, recording from abductor digiti minimi (ADM) and tibialis anterior (TA) muscles. We evaluated three measures: 1) TMS motor response threshold to the ADM, 2) central motor conduction time (CMCT), and 3) motor evoked potential amplitude (correcting for peripheral changes). Patients were evaluated at baseline, compared with controls, and followed every 3 months for up to six visits. Changes were analyzed using generalized estimation equations to test linear trends with time. Results: TMS threshold, CMCT, and TMS amplitude correlated (p < 0.05) with clinical upper motor neuron (UMN) signs at baseline and were different (p < 0.05) from normal controls in at least one response. Seventy-eight percent of patients with UMN (41/52) and 50% (4/8) of patients without clinical UMN signs had prolonged CMCT. All three measures revealed significant deterioration over time: TMS amplitude showed the greatest change, decreasing 8% per month; threshold increased 1.8% per month; and CMCT increased by 0.9% per month. Conclusions: Transcranial magnetic stimulation (TMS) findings, particularly TMS amplitude, can objectively discriminate corticospinal tract involvement in amyotrophic lateral sclerosis (ALS) from controls and assess the progression of ALS. While central motor conduction time and response threshold worsen by less than 2% per month, TMS amplitude decrease averages 8% per month, and may be a useful objective marker of disease progression. GLOSSARY ADM = abductor digiti minimi; ALS = amyotrophic lateral sclerosis; ANOVA = analysis of variance; CI = confidence interval; CMAP = compound motor action potential; CMCT = central motor conduction time; DTR = deep tendon stretch reflex; fALS = familial ALS; GEE = generalized estimation equations; LMN = lower motor neuron; MEP = motor evoked potential; PLS = primary lateral sclerosis; PMA = progressive muscular atrophy; sALS = sporadic ALS; TA = tibialis anterior; TMS = transcranial magnetic stimulation; UMN = upper motor neuron. PMID:19204259

  6. ALS: focus on purinergic signalling.

    PubMed

    Volonté, Cinzia; Apolloni, Savina; Carrì, Maria Teresa; D'Ambrosi, Nadia

    2011-10-01

    Amyotrophic lateral sclerosis (ALS) is one of the most common neuromuscular diseases. It is devastating and fatal, causing progressive paralysis of all voluntary muscles and eventually death, while sparing cognitive functions. A pathological hallmark of ALS is neuroinflammation mediated by non-neuronal cells in the nervous system, such as microglia and astrocytes that accelerate the disease progression. Scientists have neither found a unique key mechanism, nor an effective treatment against ALS, supposedly because it is a multi-factorial and multi-systemic disease. Extracellular purines and pyrimidines are widespread and powerful physiopathological molecules, signalling to most cell types and directing cell-to-cell communication networks. They are instrumental for instance for neurotransmission, muscle contraction and immune surveillance. Recent work has reported the crucial involvement of purinergic pathways in many neurodegenerative and neuroinflammatory diseases, comprising ALS. Especially P2 receptors for ATP, P1 receptors for adenosine, and nucleotide transporters were found to be modulated in ALS cells and tissues, playing a potential role in the disease. Given the composite cellular cross-talk occurring during ALS and the established action of extracellular purines/pyrimidines as neuron-to-glia alarm signal in the nervous system, a mutual query in these two fields should now be whether, how and when purinergic would meet ALS. In this review, we will highlight the early cellular and molecular purinergic cross-talk that participates to ALS etiopathology, with the conviction that better understanding of purinergic dynamics might provide original research perspectives, stimulate alternative disease modelling, and the design and testing of more powerful targeted therapeutics against this relentlessly progressive disorder. PMID:21704075

  7. Comparing the Thermodynamic Behaviour of Al(1)+ZrO2(s) to Al(1)+Al2O3(s)

    NASA Technical Reports Server (NTRS)

    Copland, Evan

    2004-01-01

    In an effort to better determine the thermodynamic properties of Al(g) and Al2O(g). the vapor in equilibrium with Al(l)+ZrO2(s) was compared to the vapor in equilibrium with Al(l)+Al2O3(s) over temperature range 1197-to-1509K. The comparison was made directly by Knudsen effusion-cell mass spectrometry with an instrument configured for a multiple effusion-cell vapor source (multi-cell KEMS). Second law enthalpies of vaporization of Al(g) and Al2O(g) together with activity measurements show that Al(l)+ZrO2(s) is thermodynamically equivalent to Al(l)+Al2O3(s), indicating Al(l) remained pure and Al2O3(s) was present in the ZrO2-cell. Subsequent observation of the Al(l)/ZrO2 and vapor/ZrO2 interfaces revealed a thin Al2O3-layer had formed, separating the ZrO2-cell from Al(l) and Al(g)+Al2O(g), effectively transforming it into an Al2O3 effusion-cell. This behavior agrees with recent observations made for Beta-NiAl(Pt) alloys measured in ZrO2 effusion-cell.

  8. Corrosion Behavior of Al-Al3Ni and Al-Al2Cu Functionally Graded Materials Fabricated by a Centrifugal Method

    NASA Astrophysics Data System (ADS)

    Noda, Kazuhiko; Miyahara, Keita; Watanabe, Yoshimi

    2008-02-01

    Intermetallic compounds, such as Al3Ni and Al2Cu, are effective for enhancing the mechanical properties of an alloy. Al-Al3Ni and Al-Al2Cu functionally graded materials (FGMs) might be attractive materials for advanced materials. Al-Al3Ni and Al-Al2Cu FGMs were fabricated by a centrifugal method; the centrifugal method is an extremely effective method for fabricating FGMs. Al-Al3Ni and Al-Al2Cu FGMs that had a graded distribution of intermetallic compounds could be produced by this in-situ centrifugal method. Particle size, particle shape and the distribution of intermetallic compounds were controlled by varying the content of the alloy element (Ni, Cu) in the master alloy, the cooling rate in casting and the gravity number. The casting mechanism is explained in terms of the microstructures of the Al-Al3Ni and Al-Al2Cu FGMs fabricated by this method. The corrosion behavior of the FGMs was investigated by electrochemical analysis. Polarization curves of the FGMs in a borate solution were measured by a potentiodynamic method. The presence of Al2Cu exerted a larger effect on the corrosion behavior of the FGMs than Al3Ni. Analysis of the polarization curve parameters was effective for evaluating the corrosion resistance of the FGMs.

  9. High Density Sliding at Ta/Al and Al/Al Interfaces

    SciTech Connect

    Hammerberg, J. E.; Germann, T. C.; Ravelo, R.

    2006-07-28

    We present 3D-nonequilibrium molecular dynamics results for the velocity dependence of the frictional force at smooth sliding interfaces for Ta and Al single crystals. For Ta/Al we consider Al(100)/Ta(100) and Al(111)/Ta(110) interfaces sliding along [001] and [11(bar sign)0]fcc /[001]bcc respectively. These are compared with Al(111)/Al(100) interfaces at the same loads, corresponding to a pressure of 15 GPa. Both interfacial pairs show similar behavior in the velocity dependence of the frictional force: a low velocity regime with an increasing frictional force followed by a strain induced transformation regime at velocities above approximately 1/10 the transverse sound speed, followed by a fluidized interface at high velocities. For both interfacial pairs, the high velocity dependence of the frictional force exhibits power law behavior, Ft {proportional_to} v-{beta} with {beta}=3/4. We discuss the structural changes that influence dissipation in each of these regimes.

  10. Everyday Life with ALS: A Practical Guide

    MedlinePLUS

    ... likely be affected by ALS. An astonish- ing array of assistive technology is now available to help ... neuromuscular diseases. MDA’s ALS Division provides a vast array of services to people with ALS, one of ...

  11. Modeling of the ALS linac

    SciTech Connect

    Kim, C.H.

    1996-08-01

    The ALS injector linac is used for the Beam Test Facility (BTF) and the Damping Experiments when it is available in between the ALS filings. These experiments usually require higher quality beams and a better characterization than is normally required for ALS operations. This paper focuses on the beam emittance, energy tilt, and especially the longitudinal variation of the beam parameters. For instance, the authors want to avoid longitudinal variations at the low beta section of the BTF. On the other hand, a large energy tilt is required for post-acceleration compression of the bunch using an alpha magnet. The PARMELA code was modified to calculate and display longitudinal variations of the emittance ellipse. Using the Microsoft Development Studio under Windows NT environment the code can handle a much larger number of particles than was previously possible.

  12. AlN/Fe/AlN nanostructures for magnetooptic magnetometry

    SciTech Connect

    Lišková-Jakubisová, E. Viš?ovský, Š.; Široký, P.; Hrabovský, D.; Pištora, J.

    2014-05-07

    AlN/Fe/AlN/Cu nanostructures with ultrathin Fe grown by sputtering on Si substrates are evaluated as probes for magnetooptical (MO) mapping of weak currents. They are considered for a laser wavelength of ??=?410?nm (3.02?eV) and operate at oblique light incidence angles, ?{sup (0)}, to enable detection of both in-plane and out-of-plane magnetization. Their performance is evaluated in terms of MO reflected wave electric field amplitudes. The maximal MO amplitudes in AlN/Fe/AlN/Cu are achieved by a proper choice of layer thicknesses. The nanostructures were characterized by MO polar Kerr effect at ?{sup (0)}???5° and longitudinal Kerr effect spectra (?{sup (0)}?=?45°) at photon energies between 1 and 5?eV. The nominal profiles were refined using a model-based analysis of the spectra. Closed form analytical expressions are provided, which are useful in the search for maximal MO amplitudes.

  13. 27Al NMR study in ZrNiAl.

    PubMed

    Nowak, B; Hayashi, S

    2000-01-01

    We have studied the microscopic properties of the hexagonal ZrNiAl, a model compound for a wide family of intermetallic compounds crystallizing in this type of structure, by using 27Al NMR spectroscopy. We have investigated the lineshape of static and MAS NMR spectra as a function of magnetic field strength (4.7-9.4 T) and temperature (5-300 K). Our data indicate that the 27Al NMR spectra result from a combined effect of quadrupole and anisotropic shift interactions. The 27Al nuclei are in an environment characterized by the quadrupole coupling constant e2qQ/h of 3.3 MHz, asymmetry parameter etaQ of 0.42, isotropic shift delta(iso) of 393 ppm, shift anisotropy delta(anis) = delta(zz) - (delta(xx) + delta(yy))/2 of 150 ppm, and asymmetry factor etaS of 0.5. They are found to be temperature independent. The spin-lattice relaxation rate measured at 7.05 T is proportional to the temperature with T1T = 135 s K. The mechanisms responsible for observed values of delta(iso), delta(anis), T1T, and the enhanced Korringa constant are discussed. PMID:11270742

  14. Microstructure Evolution and Mechanical Properties of Al/Al-Mg/Al composite sheet metals

    NASA Astrophysics Data System (ADS)

    Cho, Jaehyung; Kim, Su-Hyeon; Kim, Hyoung-Wook; Lim, Cha-Yong; Kim, Eun-Young; Choi, Shi-Hoon

    2011-08-01

    Two different types of aluminum alloys of AA1050 and AA5182 were used to manufacture Al/Al-Mg/Al composite sheet metals by roll bonding technology at room temperature. The composite sheet metals were annealed at 400 °C and carried out uniaxial tension tests to investigate mechanical properties. Macroscopic mechanical properties are strongly dependent on the volume (or thickness) fraction of two component layers. Microstructure and texture evolution were also investigated during roll bonding process. The AA1050 sheets located in the outer layer mainly consist of shear texture components and the AA5182 sheet located in the center layer consists of plane strain texture components. With differential speeds of the top and bottom rolls, roll bonding was also carried out. Elongation along the RD and TD was improved at a speed difference of approximately 10%-20%.

  15. Cdk5 sinks into ALS.

    PubMed

    Patzke, Holger; Tsai, Li Huei

    2002-01-01

    Recent research points to an involvement of deregulated cdk5 activity in the pathogenesis of mutant SOD1-mediated disease. In addition, inhibition of this activity might promote motor neuron survival. These observations have opened the door to further research into the role of cdk5 in ALS and other neurodegenerative diseases. PMID:11801324

  16. Dynamic Modeling of ALS Systems

    NASA Technical Reports Server (NTRS)

    Jones, Harry

    2002-01-01

    The purpose of dynamic modeling and simulation of Advanced Life Support (ALS) systems is to help design them. Static steady state systems analysis provides basic information and is necessary to guide dynamic modeling, but static analysis is not sufficient to design and compare systems. ALS systems must respond to external input variations and internal off-nominal behavior. Buffer sizing, resupply scheduling, failure response, and control system design are aspects of dynamic system design. We develop two dynamic mass flow models and use them in simulations to evaluate systems issues, optimize designs, and make system design trades. One model is of nitrogen leakage in the space station, the other is of a waste processor failure in a regenerative life support system. Most systems analyses are concerned with optimizing the cost/benefit of a system at its nominal steady-state operating point. ALS analysis must go beyond the static steady state to include dynamic system design. All life support systems exhibit behavior that varies over time. ALS systems must respond to equipment operating cycles, repair schedules, and occasional off-nominal behavior or malfunctions. Biological components, such as bioreactors, composters, and food plant growth chambers, usually have operating cycles or other complex time behavior. Buffer sizes, material stocks, and resupply rates determine dynamic system behavior and directly affect system mass and cost. Dynamic simulation is needed to avoid the extremes of costly over-design of buffers and material reserves or system failure due to insufficient buffers and lack of stored material.

  17. AlN/Al dual protective coatings on NdFeB by DC magnetron sputtering

    NASA Astrophysics Data System (ADS)

    Li, Jinlong; Mao, Shoudong; Sun, Kefei; Li, Xiaomin; Song, Zhenlun

    2009-11-01

    AlN/Al dual protective coatings were prepared on NdFeB by DC magnetron sputtering in a home-made industrial apparatus. Comparing with Al coating, AlN/Al coatings have a denser structure of an outmost AlN amorphous layer following an inner Al columnar crystal layer. The coatings and NdFeB substrate combine well, and moreover, there is occurrence of metallurgy bonding in the interface layer. Both Al and AlN/Al coatings have a good protective ability to NdFeB. Especially, the corrosion resistance of AlN/Al coated NdFeB is improved largely. AlN/Al and Al protective coatings not only do not deteriorate the magnetic properties of NdFeB, but contribute to their slight increase.

  18. Large rectification magnetoresistance in nonmagnetic Al/Ge/Al heterojunctions.

    PubMed

    Zhang, Kun; Li, Huan-Huan; Grünberg, Peter; Li, Qiang; Ye, Sheng-Tao; Tian, Yu-Feng; Yan, Shi-Shen; Lin, Zhao-Jun; Kang, Shi-Shou; Chen, Yan-Xue; Liu, Guo-Lei; Mei, Liang-Mo

    2015-01-01

    Magnetoresistance and rectification are two fundamental physical properties of heterojunctions and respectively have wide applications in spintronics devices. Being different from the well known various magnetoresistance effects, here we report a brand new large magnetoresistance that can be regarded as rectification magnetoresistance: the application of a pure small sinusoidal alternating-current to the nonmagnetic Al/Ge Schottky heterojunctions can generate a significant direct-current voltage, and this rectification voltage strongly varies with the external magnetic field. We find that the rectification magnetoresistance in Al/Ge Schottky heterojunctions is as large as 250% at room temperature, which is greatly enhanced as compared with the conventional magnetoresistance of 70%. The findings of rectification magnetoresistance open the way to the new nonmagnetic Ge-based spintronics devices of large rectification magnetoresistance at ambient temperature under the alternating-current due to the simultaneous implementation of the rectification and magnetoresistance in the same devices. PMID:26387967

  19. Large rectification magnetoresistance in nonmagnetic Al/Ge/Al heterojunctions

    PubMed Central

    Zhang, Kun; Li, Huan-huan; Grünberg, Peter; Li, Qiang; Ye, Sheng-tao; Tian, Yu-feng; Yan, Shi-shen; Lin, Zhao-jun; Kang, Shi-shou; Chen, Yan-xue; Liu, Guo-lei; Mei, Liang-mo

    2015-01-01

    Magnetoresistance and rectification are two fundamental physical properties of heterojunctions and respectively have wide applications in spintronics devices. Being different from the well known various magnetoresistance effects, here we report a brand new large magnetoresistance that can be regarded as rectification magnetoresistance: the application of a pure small sinusoidal alternating-current to the nonmagnetic Al/Ge Schottky heterojunctions can generate a significant direct-current voltage, and this rectification voltage strongly varies with the external magnetic field. We find that the rectification magnetoresistance in Al/Ge Schottky heterojunctions is as large as 250% at room temperature, which is greatly enhanced as compared with the conventional magnetoresistance of 70%. The findings of rectification magnetoresistance open the way to the new nonmagnetic Ge-based spintronics devices of large rectification magnetoresistance at ambient temperature under the alternating-current due to the simultaneous implementation of the rectification and magnetoresistance in the same devices. PMID:26387967

  20. Thermodynamic modeling of Pt-Al and Pd-Al

    NASA Astrophysics Data System (ADS)

    Carr, Derek

    2011-03-01

    Pure platinum and pure palladium are too soft for typical jewelry applications. Adding small amounts of other metals can significantly increase their performance. However, international hallmarking standards require the alloys to be 95% pure by weight. How does one achieve significant improvements in performance adding only small amounts (5 wt-%) of other metals? Significant improvements are possible even with small additions if precipitate hardening can be induced. Using a combination of first-principles, cluster expansion, and Monte Carlo modeling, we have identified new Pt-rich/Pd-rich phases in Pt-Al and Pd-Al that should be useful in precipitate hardening. Thermodynamical modeling indicates that the phases are experimentally feasible (not kinetically inhibited).

  1. Large rectification magnetoresistance in nonmagnetic Al/Ge/Al heterojunctions

    NASA Astrophysics Data System (ADS)

    Zhang, Kun; Li, Huan-Huan; Grünberg, Peter; Li, Qiang; Ye, Sheng-Tao; Tian, Yu-Feng; Yan, Shi-Shen; Lin, Zhao-Jun; Kang, Shi-Shou; Chen, Yan-Xue; Liu, Guo-Lei; Mei, Liang-Mo

    2015-09-01

    Magnetoresistance and rectification are two fundamental physical properties of heterojunctions and respectively have wide applications in spintronics devices. Being different from the well known various magnetoresistance effects, here we report a brand new large magnetoresistance that can be regarded as rectification magnetoresistance: the application of a pure small sinusoidal alternating-current to the nonmagnetic Al/Ge Schottky heterojunctions can generate a significant direct-current voltage, and this rectification voltage strongly varies with the external magnetic field. We find that the rectification magnetoresistance in Al/Ge Schottky heterojunctions is as large as 250% at room temperature, which is greatly enhanced as compared with the conventional magnetoresistance of 70%. The findings of rectification magnetoresistance open the way to the new nonmagnetic Ge-based spintronics devices of large rectification magnetoresistance at ambient temperature under the alternating-current due to the simultaneous implementation of the rectification and magnetoresistance in the same devices.

  2. CO oxidation mechanism on AlAun

    NASA Astrophysics Data System (ADS)

    Guo, Ling; An, Xiaoyu; Li, Shuying; Li, Aixia

    2015-04-01

    CO oxidation via LH mechanism on AlAun (n = 1-12) have been studied by density functional theory calculations with the aim to shed light on reaction mechanism and catalytic activity of AlAu alloy. The AlAun molecular structures and adsorption energies of a single CO or O2 molecule as well as coadsorption energies of CO + O2, CO2 + O, and CO + O on various distinctive sites of each AlAun are predicted. The calculated results show that the overall LH, AlAun + O2(gas) + CO(gas) ?A lAun-O2(ads) + CO(ads) ? AlAun-OOCO(ads) ? AlAun-O(ads) + CO2(gas) ? AlAun-O(ads) + CO(ads) ? AlAun-OCO(ads) ? AlAun + CO2(gas) is calculated to by exothermic by -144.8 kcal/mol. It suggests that the CO oxidation catalyzed by the AlAu6 and AlAu12 is likely to occur at or even below room temperature. AlAu6 and AlAu12 exhibit a larger catalytic activity for CO oxidation by O2 molecule.

  3. Synthesis of AlN/Al Polycrystals along with Al Nanoparticles Using Thermal Plasma Route

    SciTech Connect

    Kanhe, Nilesh S.; Nawale, A. B.; Kulkarni, N. V.; Bhoraskar, S. V.; Mathe, V. L.; Das, A. K.

    2011-07-15

    This paper for the first time reports the (200) oriented growth of hexagonal Aluminum nitride crystals during synthesis of aluminum nanoparticles in dc transferred arc thermal plasma reactor by gas phase condensation in nitrogen plasma. The structural and morphological study of as synthesized AlN crystal and aluminium nanoparticles was done by using the x-ray diffraction method, scanning electron microscopy and transmission electron microscopy.

  4. Synthesis of AlN/Al Polycrystals along with Al Nanoparticles Using Thermal Plasma Route

    NASA Astrophysics Data System (ADS)

    Kanhe, Nilesh S.; Nawale, A. B.; Kulkarni, N. V.; Bhoraskar, S. V.; Mathe, V. L.; Das, A. K.

    2011-07-01

    This paper for the first time reports the (200) oriented growth of hexagonal Aluminum nitride crystals during synthesis of aluminum nanoparticles in dc transferred arc thermal plasma reactor by gas phase condensation in nitrogen plasma. The structural and morphological study of as synthesized AlN crystal and aluminium nanoparticles was done by using the x-ray diffraction method, scanning electron microscopy and transmission electron microscopy.

  5. NiAl-base composite containing high volume fraction of AlN for advanced engines

    NASA Technical Reports Server (NTRS)

    Hebsur, Mohan (Inventor); Whittenbeger, John D. (Inventor); Lowell, Carl F. (Inventor)

    1994-01-01

    A particulate reinforced NiAl-AlN composite alloy has a NiAl matrix and greater than about 13 volume percent fine particles of AlN within the matrix. The particles preferably have a diameter from about 15 nanometers to about 50 nanometers. The particulate reinforced NiAl-AlN composite alloy may be prepared by cryomilling prealloyed NiAl in liquid nitrogen using grinding media having a diameter of from about 2 to 6 mm at an impeller speed of from about 450 RPM to about 800 RPM. The cryomilling may be done for a duration of from about 4 hours to about 20 hours to obtain a cryomilled powder. The cryomilled powder may be consolidated to form the particulate reinforced NiAl-AlN composite alloy. The particulate reinforced alloy can further include a toughening alloy. The toughening alloy may include NiCrAlY, FeCrAlY, and FeAl.

  6. Everyday Life with ALS: A Practical Guide

    MedlinePLUS

    ... in Progress Search form Search Everyday Life with ALS: A Practical Guide March 2010 Download a printable ... in this one. Back to top Resources MDA ALS Division The Muscular Dystrophy Association, one of the ...

  7. Benefits for Military Veterans with ALS

    MedlinePLUS

    ... Get Involved Donate Military Veterans Resources for Military Veterans, Families & Survivors The ALS Association is working everyday to ... not served. This site is designed specifically for veterans with ALS, their families and survivors. Here you will learn what benefits ...

  8. New synthetic route to Al4O4C reinforced Al-Al2O3 composite materials

    NASA Astrophysics Data System (ADS)

    Jiang, Peng; Sun, Jialin; Xue, Wendong; Chen, Junhong; Vasant Kumar, R.; Li, Yong

    2015-08-01

    Carbon free Al-Al2O3 composite sliding gate materials were successfully prepared by adding excess amount of Al powders through carbon burial sintering at 1450 °C for 6 h. Physical properties including apparent porosity, bulk density, ambient temperature crushing strength and hot rupture modulus were characterized for all the samples and addition of 9 at% aluminum powder was proved to exhibit optimal properties. The XRD and SEM results reveal that Al4O4C and AlN phases shown in the product samples are serving as reinforcement phase, contributing to better physical performances.

  9. Photoelectrical, photophysical and photocatalytic properties of Al based MOFs: MIL-53(Al) and MIL-53-NH2(Al)

    NASA Astrophysics Data System (ADS)

    An, Yang; Li, Huiliang; Liu, Yuanyuan; Huang, Baibiao; Sun, Qilong; Dai, Ying; Qin, Xiaoyan; Zhang, Xiaoyang

    2016-01-01

    Two Al based MOFs (MIL-53(Al) and MIL-53-NH2 (Al)) were synthesized, and their photoelectrical, photophysical and photocatalytic properties towards oxygen evolution from water were investigated. Different from the ligand to metal charge transfer process previously reported, we proposes a new photocatalytic mechanism based on electron tunneling according to the results of theoretical calculation, steady state and time resolved fluorescence spectra. The organic linkers absorb photons, giving rise to electrons and holes. Then, the photogenerated electrons tunnel through the AlO6-octahedra, which not only inhibit the recombination of photogenerated charge carriers, but also is a key factor to the photocatalytic activity of Al based MOFs.

  10. Al-Co-Fe (Aluminium - Cobalt - Iron)

    NASA Astrophysics Data System (ADS)

    Materials Science International Team MSIT®

    This document is part of Subvolume A1 'Light Metal Systems. Part 1: Selected Systems from Ag-Al-Cu to Al-Cu-Er' of Volume 11 'Ternary Alloy Systems - Phase Diagrams, Crystallographic and Thermodynamic Data critically evaluated by MSIT®' of Landolt-Börnstein - Group IV Physical Chemistry. It provides the data for the ternary system Al-Co-Fe (Aluminium - Cobalt - Iron).

  11. Framework Al zoning in zeolite ECR-1.

    PubMed

    Shin, Jiho; Ahn, Nak Ho; Cho, Sung June; Ren, Limin; Xiao, Feng-Shou; Hong, Suk Bong

    2014-02-25

    Rietveld analyses of the synchrotron X-ray diffraction data for various cation forms of zeolite ECR-1 have demonstrated framework Al zoning, which parallels the alternation of Al-rich maz and Al-poor mor layers. This can be further supported by notable differences in the average bond valence of its 10 crystallographically distinct tetrahedral sites. PMID:24409461

  12. Nonstoichiometry of Al-Zr intermetallic phases

    SciTech Connect

    Radmilovic, V.; Thomas, G.

    1994-06-01

    Nonstoichiometry of metastable cubic {beta}{prime} and equilibrium tetragonal {beta} Al-Zr intermetallic phases of the nominal composition Al{sub 3}Zr in Al-rich alloys has been extensively studied. It is proposed that the ``dark contrast`` of {beta}{prime} core in {beta}{prime}/{sigma}{prime} complex precipitates, in Al-Li-Zr based alloys, is caused by incorporation of Al and Li atoms into the {beta}{prime} phase on Zr sublattice sites, forming nonstoichiometric Al-Zr intermetallic phases, rather than by Li partitioning only. {beta}{prime} particles contain very small amounts of Zr, approximately 5 at.%, much less than the stoichiometric 25 at.% in the Al{sub 3}Zr metastable phase. These particles are, according to simulation of high resolution images, of the Al{sub 3}(Al{sub 0.4}Li{sub 0.4}Zr{sub 0.2}) type. Nonstoichiometric particles of average composition Al{sub 4}Zr and Al{sub 6}Zr are observed also in the binary Al-Zr alloy, even after annealing for several hours at 600{degree}C.

  13. Aluminium distribution in ZSM-5 revisited: The role of Al-Al interactions

    SciTech Connect

    Ruiz-Salvador, A. Rabdel; Grau-Crespo, Ricardo; Gray, Aileen E.; Lewis, Dewi W.

    2013-02-15

    We present a theoretical study of the distribution of Al atoms in zeolite ZSM-5 with Si/Al=47, where we focus on the role of Al-Al interactions rather than on the energetics of Al/Si substitutions at individual sites. Using interatomic potential methods, we evaluate the energies of the full set of symmetrically independent configurations of Al siting in a Si{sub 94}Al{sub 2}O{sub 192} cell. The equilibrium Al distribution is determined by the interplay of two factors: the energetics of the Al/Si substitution at an individual site, which tends to populate particular T sites (e.g., the T14 site), and the Al-Al interaction, which at this Si/Al maximises Al-Al distances in general agreement with Dempsey's rule. However, it is found that the interaction energy changes approximately as the inverse of the square of the distance between the two Al atoms, rather than the inverse of the distance expected if this were merely charge repulsion. Moreover, we find that the anisotropic nature of the framework density plays an important role in determining the magnitude of the interactions, which are not simply dependent on Al-Al distances. - Graphical abstract: Role of Al-Al interactions in high silica ZSM-5 is shown to be anisotropic in nature and not dependent solely on Coulombic interactions. Highlights: Black-Right-Pointing-Pointer Si-Al distribution in ZSM-5 is revisited, stressing the role of the Al-Al interaction. Black-Right-Pointing-Pointer Coulomb interactions are not the key factors controlling the Al siting. Black-Right-Pointing-Pointer Anisotropy of the framework is identified as a source of departure from Dempsey's rule.

  14. Opportunity's 'Rub al Khali' Panorama

    NASA Technical Reports Server (NTRS)

    2005-01-01

    [figure removed for brevity, see original site] Click on the image for Opportunity's 'Rub al Khali' Panorama (QTVR)

    This panoramic image, dubbed 'Rub al Khali,' was acquired by NASA's Mars Exploration Rover Opportunity on the plains of Meridiani during the period from the rover's 456th to 464th sols on Mars (May 6 to May 14, 2005). Opportunity was about 2 kilometers (1.2 miles) south of 'Endurance Crater' at a place known informally as 'Purgatory Dune.'

    The rover was stuck in the dune's deep fine sand for more than a month. 'Rub al Khali' (Arabic translation: 'the empty quarter') was chosen as the name for this panorama because it is the name of a similarly barren, desolate part of the Saudi Arabian desert on Earth.

    The view spans 360 degrees. It consists of images obtained in 97 individual pointings of the panoramic camera. The camera took images with five camera filters at each pointing. This 22,780-by-6,000-pixel mosaic is an approximately true-color rendering generated using the images acquired through filters admitting light wavelengths of 750, 530, and 480 nanometers.

    Lighting varied during the nine sols it took to acquire this panorama, resulting in some small image seams within the mosaic. These seams have been smoothed in sky parts of the mosaic to better simulate the vista that a person would see if able to view it all at the same time on Mars.

    Opportunity's tracks leading back to the north (center of the panorama) are a reminder of the rover's long trek from Endurance Crater. The deep ruts dug by Opportunity's wheels as it became stuck in the sand appear in the foreground. The crest and trough of the last ripple the rover crossed before getting stuck is visible in the center. These wind-formed sand features are only about 10 to 15 centimeters (4 to 6 inches) tall. The crest of the actual ripple where the rover got stuck can be seen just to the right of center. The tracks and a few other places on and near ripple crests can be seen in this color image to be dustier than the undisturbed or 'normal' plains soils in Meridiani. Since the time these ruts were made, some of the dust there has been blown away by the wind, reaffirming the dynamic nature of the martian environment, even in this barren, ocean-like desert of sand.

  15. Cyclic oxidation resistance of a reaction milled NiAl-AlN composite

    NASA Technical Reports Server (NTRS)

    Lowell, Carl E.; Barrett, Charles A.; Whittenberger, J. D.

    1990-01-01

    Based upon recent mechanical property tests a NiAl-AlN composite produced by cryomilling has very attractive high temperature strength. This paper focuses on the oxidation resistance of the NiAl-AlN composite at 1473 and 1573 K as compared to that of Ni-47Al-0.15Zr, one of the most oxidation resistant intermetallics. The results of cyclic oxidation tests show that the NiAl-AlN composite has excellent properties although not quite as good as those of Ni-47Al-0.15Zr. The onset of failure of the NiAl-AlN was unique in that it was not accompanied by a change in scale composition from alumina to less protective oxides. Failure in the composite appears to be related to the entrapment of AlN particles within the alumina scale.

  16. Instandhaltungsmanagement als Gestaltungsfeld Ganzheitlicher Produktionssysteme

    NASA Astrophysics Data System (ADS)

    Dombrowski, Uwe; Schulze, Sven; Otano, Isabel Crespo

    Sich kontinuierlich verändernde Rahmenbedingungen, wie beispielsweise eine steigende Variantenvielfalt, verkürzte Produktlebenszyklen sowie Kundenforderungen nach höherer Qualität, kürzeren Lieferzeiten und geringeren Kosten, fordern von produzierenden Unternehmen eine stetige Anpassung der Prozesse, der Organisation und der Strukturen. Seit den 90er Jahren versuchen immer mehr deutsche Unternehmen diesen veränderten Anforderungen mit der Einführung eines Ganzheitlichen Produktionssystems (GPS) zu begegnen. Ganzheitliche Produktionssysteme sind dabei in ihren Grundlagen an das Toyota Produktionssystem angelehnt, vereinigen aber auch weitere Methoden zu einem unternehmensspezifischen Regelwerk. Im Rahmen des langfristigen Trends zu unternehmensindividuellen Produktionssystemen wird sowohl in der Industrie als auch in der Forschung intensiv über das Toyota Produktionssystem, Lean Production, Lean Management und Ganzheitliche Produktionssysteme diskutiert, werden Konzepte zu Implementierung und Betrieb erstellt und die Wirtschaftlichkeit untersucht.

  17. Systems Engineering Techniques for ALS Decision Making

    NASA Technical Reports Server (NTRS)

    Rodriquez, Luis F.; Drysdale, Alan E.; Jones, Harry; Levri, Julie A.

    2004-01-01

    The Advanced Life Support (ALS) Metric is the predominant tool for predicting the cost of ALS systems. Metric goals for the ALS Program are daunting, requiring a threefold increase in the ALS Metric by 2010. Confounding the problem, the rate new ALS technologies reach the maturity required for consideration in the ALS Metric and the rate at which new configurations are developed is slow, limiting the search space and potentially giving the perspective of a ALS technology, the ALS Metric may remain elusive. This paper is a sequel to a paper published in the proceedings of the 2003 ICES conference entitled, "Managing to the metric: an approach to optimizing life support costs." The conclusions of that paper state that the largest contributors to the ALS Metric should be targeted by ALS researchers and management for maximum metric reductions. Certainly, these areas potentially offer large potential benefits to future ALS missions; however, the ALS Metric is not the only decision-making tool available to the community. To facilitate decision-making within the ALS community a combination of metrics should be utilized, such as the Equivalent System Mass (ESM)-based ALS metric, but also those available through techniques such as life cycle costing and faithful consideration of the sensitivity of the assumed models and data. Often a lack of data is cited as the reason why these techniques are not considered for utilization. An existing database development effort within the ALS community, known as OPIS, may provide the opportunity to collect the necessary information to enable the proposed systems analyses. A review of these additional analysis techniques is provided, focusing on the data necessary to enable these. The discussion is concluded by proposing how the data may be utilized by analysts in the future.

  18. Wear behavior of Al-Al{sub 3}Ti composite manufactured by a centrifugal method

    SciTech Connect

    Watanabe, Yoshimi; Yamanaka, Noboru; Fukui, Yasuyoshi

    1999-12-01

    The purpose of the present study was to develop a wear-resistant, light Al-Al{sub 3}Ti composite material. An Al-Al{sub 3}Ti composite specimen was machined from a thick-walled tube of Al-Al{sub 3}Ti functionally graded material (FGM) manufactured by the centrifugal method from a commercial ingot of Al-5 mass% Ti master alloy. The alloy was heated to a temperature where solid Al{sub 3}Ti particles resided in a liquid Al matrix, and then the centrifugal method was carried out. Al{sub 3}Ti particles in a commercial alloy ingot exist as platelets, and this shape was maintained through the casting. Three kinds of wear specimens were prepared, taking into account the morphology of the Al{sub 3}Ti particles in the thick-walled FGM tube; the Al{sub 3}Ti particles were arranged with their platelet planes nearly normal to the radial direction as a result of the applied centrifugal force. The wear resistance of the Al-Al{sub 3}Ti composite was significantly higher than that of pure Al. Wear-resistance anisotropy and dissolution of the Al{sub 3}Ti into the Al matrix at the near-surface region, around 100 {micro}m in depth, were also observed. The mechanism of the supersaturated-layer formation and the origin of the anisotropic wear resistance are discussed.

  19. Oxidation induced softening in Al nanowires

    NASA Astrophysics Data System (ADS)

    Sen, Fatih G.; Qi, Yue; van Duin, Adri C. T.; Alpas, Ahmet T.

    2013-02-01

    The mechanical properties of metallic nanowires depend dramatically on the atmospheric conditions. Molecular-dynamics simulations with ReaxFF were conducted to study tensile elastic deformation of oxidized Al nanowires. The thin amorphous oxide shell formed around Al nanowires had a very low Young's modulus of 26 GPa, due to its low density and low Al-O coordination. Consequently, for diameters less than 100 nm, the composite Young's modulus of oxide-covered Al nanowires showed a size dependence implying that in this case "smaller is softer." The model developed also explained the discrepancies in the reported modulus values of nanometer-scale Al thin films.

  20. Nucleation and Precipitation Strengthening in Dilute Al-Ti and Al-Zr Alloys

    NASA Astrophysics Data System (ADS)

    Knipling, Keith E.; Dunand, David C.; Seidman, David N.

    2007-10-01

    Two conventionally solidified Al-0.2Ti alloys (with 0.18 and 0.22 at. pct Ti) exhibit no hardening after aging up to 3200 hours at 375 °C or 425 °C. This is due to the absence of Al3Ti precipitation, as confirmed by electron microscopy and electrical conductivity measurements. By contrast, an Al-0.2Zr alloy (with 0.19 at. pct Zr) displays strong age hardening at both temperatures due to precipitation of Al3Zr (L12) within Zr-enriched dendritic regions. This discrepancy between the two alloys is explained within the context of the equilibrium phase diagrams: (1) the disparity in solid and liquid solubilities of Ti in ?-Al is much greater than that of Zr in ?-Al; and (2) the relatively small liquid solubility of Ti in ?-Al limits the amount of solute retained in solid solution during solidification, while the comparatively high solid solubility reduces the supersaturation effecting precipitation during post-solidification aging. The lattice parameter mismatch of Al3Ti (L12) with ?-Al is also larger than that of Al3Zr (L12), further hindering nucleation of Al3Ti. Classical nucleation theory indicates that the minimum solute supersaturation required to overcome the elastic strain energy of Al3Ti nuclei cannot be obtained during conventional solidification of Al-Ti alloys (unlike for Al-Zr alloys), thus explaining the absence of Al3Ti precipitation and the presence of Al3Zr precipitation.

  1. Reactive Plasma Spraying of Fine Al2O3/AlN Feedstock Powder

    NASA Astrophysics Data System (ADS)

    Shahien, Mohammed; Yamada, Motohiro; Yasui, Toshiaki; Fukumoto, Masahiro

    2013-12-01

    Reactive plasma spraying (RPS) is a promising technology for in situ formation of aluminum nitride (AlN) coatings. Recently, AlN-based coatings were fabricated by RPS of alumina (Al2O3) powder in N2/H2 thermal plasma. This study investigated the feasibility of RPS of a fine Al2O3/AlN mixture and the influence of the plasma gases (N2, H2) on the nitriding conversion, and coating microstructure and properties. Thick AlN/Al2O3 coatings with high nitride content were successfully fabricated. The coatings consist of h-AlN, c-AlN, Al5O6N, γ-Al2O3, and a small amount of α-Al2O3. Use of fine particles enhanced the nitriding conversion and the melting tendency by increasing the surface area. Furthermore, the AlN additive improved the AlN content in the coatings. Increasing the N2 gas flow rate improved the nitride content and complete crystal growth to the h-AlN phase, and enhanced the coating thickness. On the other hand, though the H2 gas is required for plasma nitriding of the Al2O3 particles, increasing its flow rate decreased the nitride content and the coating thickness. Remarkable influence of the plasma gases on the coating composition, microstructure, and properties was observed during RPS of the fine particles.

  2. Mg isotopic heterogeneity, Al-Mg isochrons, and canonical 26Al/27Al in the early solar system

    NASA Astrophysics Data System (ADS)

    Wasserburg, G. J.; Wimpenny, Josh; Yin, Qing-Zhu

    2012-12-01

    Abstract-There is variability in the Mg isotopic composition that is a reflection of the widespread heterogeneity in the isotopic composition of the elements in the solar system at approximately 100 ppm. Measurements on a single calcium-aluminum-rich inclusion (CAI) gave a good correlation of 26Mg/24Mg with 27<span class="hlt">Al</span>/24Mg, yielding an isochron corresponding to an initial (26<span class="hlt">Al</span>/27<span class="hlt">Al</span>)o = (5.27 ± 0.18) × 10-5 and an initial (26Mg/24Mg)o = -0.127 ± 0.032‰ relative to the standard. This isochron is parallel to that obtained by <link href="#b41 #b42">Jacobsen et <span class="hlt">al</span>. (2008), but is distinctively offset. This demonstrates that there are different initial Mg isotopic compositions in different samples with the same 26<span class="hlt">Al</span>/27<span class="hlt">Al</span>. No inference about uniformity/heterogeneity of 26<span class="hlt">Al</span>/27<span class="hlt">Al</span> on a macro scale can be based on the initial (26Mg/24Mg)o values. Different values of 26<span class="hlt">Al</span>/27<span class="hlt">Al</span> for samples representing the same point in time would prove heterogeneity of 26<span class="hlt">Al</span>/27<span class="hlt">Al</span>. The important issue is whether the bulk solar inventory of 26<span class="hlt">Al</span>/27<span class="hlt">Al</span> was approximately 5 × 10-5 at some point in the early solar system. We discuss ultra refractory phases of solar type oxygen isotope composition with 26<span class="hlt">Al</span>/27<span class="hlt">Al</span> from approximately 5 × 10-5 to below 0.2 × 10-5. We argue that the real issues are: intrinsic heterogeneity in the parent cloud; mechanism and timing for the later production of 16O-poor material; and the relationship to earlier formed 16O-rich material in the disk. 26<span class="hlt">Al</span>-free refractories can be produced at a later time by late infall, if there is an adequate heat source, or from original heterogeneities in the placental molecular cloud from which the solar system formed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013ApPhL.102k1603M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013ApPhL.102k1603M"><span id="translatedtitle">Atom probe analysis of <span class="hlt">Al</span>N interlayers in <span class="hlt">AlGaN/Al</span>N/GaN heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mazumder, Baishakhi; Kaun, Stephen W.; Lu, Jing; Keller, Stacia; Mishra, Umesh K.; Speck, James S.</p> <p>2013-03-01</p> <p>Atom probe tomography was used to characterize <span class="hlt">Al</span>N interlayers in <span class="hlt">AlGaN/Al</span>N/GaN heterostructures grown by plasma-assisted molecular beam epitaxy (PAMBE), NH3-based molecular beam epitaxy (NH3-MBE), and metal-organic chemical vapor deposition (MOCVD). The PAMBE-grown <span class="hlt">Al</span>N interlayer had the highest purity, with nearly 100% of group-III sites occupied by <span class="hlt">Al</span>. The group-III site concentrations of <span class="hlt">Al</span> for interlayers grown by NH3-MBE and MOCVD were ˜85% and ˜47%, respectively. Hall measurements were performed to determine the two-dimensional electron gas mobility and sheet concentration. Sheet concentrations were ˜25%-45% higher with molecular beam epitaxy than with MOCVD, and these results matched well with atom probe data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22162790','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22162790"><span id="translatedtitle">Atom probe analysis of <span class="hlt">Al</span>N interlayers in <span class="hlt">AlGaN/Al</span>N/GaN heterostructures</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mazumder, Baishakhi; Kaun, Stephen W.; Speck, James S.; Lu, Jing; Keller, Stacia; Mishra, Umesh K.</p> <p>2013-03-18</p> <p>Atom probe tomography was used to characterize <span class="hlt">Al</span>N interlayers in <span class="hlt">AlGaN/Al</span>N/GaN heterostructures grown by plasma-assisted molecular beam epitaxy (PAMBE), NH{sub 3}-based molecular beam epitaxy (NH{sub 3}-MBE), and metal-organic chemical vapor deposition (MOCVD). The PAMBE-grown <span class="hlt">Al</span>N interlayer had the highest purity, with nearly 100% of group-III sites occupied by <span class="hlt">Al</span>. The group-III site concentrations of <span class="hlt">Al</span> for interlayers grown by NH{sub 3}-MBE and MOCVD were {approx}85% and {approx}47%, respectively. Hall measurements were performed to determine the two-dimensional electron gas mobility and sheet concentration. Sheet concentrations were {approx}25%-45% higher with molecular beam epitaxy than with MOCVD, and these results matched well with atom probe data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/443755','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/443755"><span id="translatedtitle">Reply to Vance et <span class="hlt">al</span>.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Woon-Chee Yee; Elliott, J.L; Kwon, J.M.; Goodfellow, P.</p> <p>1996-07-01</p> <p>In our report of a family with a motor and sensory polyneuropathy that was linked to chromosome 3q, we classified this neuropathy as a form of hereditary motor and sensory neuropathy II (HMSN II, also known as {open_quotes}CMT2{close_quotes}). Doubts have been raised by Vance et <span class="hlt">al</span>. as to whether this neuropathy should be classified as hereditary sensory autonomic neuropathy I (HSAN I) instead of HMSN II. While it is reasonable to raise such doubts, we believe that the neuropathy is best designated as HMSN II for the reasons described below. The group of disorders described as HSAN are characterized by primary or predominant involvement of sensory and autonomic neurons that fail to develop or that undergo atrophy and degeneration. These disorders were extensively reviewed by Dyck and Ohta, who initially described them as the hereditary sensory neuropathies (HSN). It was Dyck who subsequently suggested that these disorders be designated HSAN rather than HSN, because of the presence of autonomic involvement. 8 refs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/15510857','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/15510857"><span id="translatedtitle">Development of <span class="hlt">Al</span>2O3 fiber-reinforced <span class="hlt">Al</span>2O3-based ceramics.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Tanimoto, Yasuhiro; Nemoto, Kimiya</p> <p>2004-09-01</p> <p>The purpose of this study was to use a tape casting technique to develop an <span class="hlt">Al</span>2O3 fiber-reinforced <span class="hlt">Al</span>2O3-based ceramic material (<span class="hlt">Al</span>2O3-fiber/<span class="hlt">Al</span>2O3 composite) into a new type of dental ceramic. The <span class="hlt">Al</span>2O3-based ceramic used a matrix consisting of 60 wt% <span class="hlt">Al</span>2O3 powder and 40 wt% SiO2-B2O3 powder. The prepreg sheets of <span class="hlt">Al</span>2O3-fiber/<span class="hlt">Al</span>2O3 composite (in which uniaxially aligned <span class="hlt">Al</span>2O3 fibers were infiltrated with the <span class="hlt">Al</span>2O3-based matrix) were fabricated continuously using tape casting technique with a doctor blade system. Multilayer preforms of <span class="hlt">Al</span>2O3-fiber/<span class="hlt">Al</span>2O3 composite sheets were then sintered at a maximum temperature of 1000 degrees C under an atmospheric pressure in a furnace. The results showed that the shrinkage and bending properties of <span class="hlt">Al</span>2O3-fiber/<span class="hlt">Al</span>2O3 composite exceeded those of unreinforced <span class="hlt">Al</span>2O3--hence demonstrating the positive effects of fiber reinforcement. In conclusion, the tape casting technique has been utilized to successfully develop a new type of dental ceramic material. PMID:15510857</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/8817656','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/8817656"><span id="translatedtitle">Structure and regulation of the <span class="hlt">ALS</span> gene.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ooi, G T; Cohen, F J; Hsieh, S; Seto, D; Rechler, M M; Boisclair, Y R</p> <p>1995-01-01</p> <p>The mouse <span class="hlt">ALS</span> gene spans at least 6 kb. It contains 2 exons which encode a protein highly homologous to human and rat <span class="hlt">ALS</span>. It was localized to mouse chromosome 17 by flourescent in situ hybridization. The 5' flanking region lacks a TATA box but contains GC boxes that may be recognised by transcription factors such as Spl. Hepatic <span class="hlt">ALS</span> mRNA is decreased in rats following hypophysectomy, and restored by stimulated <span class="hlt">ALS</span> promoter activity in a rat hepatoma cell line, but not in 3T3-F442A mouse preadipocyte fibroblasts, suggesting that utilisation of the <span class="hlt">ALS</span> promoter is cell-type specific. The rat hepatoma system is a promising system to study the regulation of <span class="hlt">ALS</span> gene expression, and the signalling pathways of CH regulation. PMID:8817656</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4683522','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4683522"><span id="translatedtitle">Growth and Stress-induced Transformation of Zinc blende <span class="hlt">Al</span>N Layers in <span class="hlt">Al-Al</span>N-TiN Multilayers</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Li, Nan; Yadav, Satyesh K.; Wang, Jian; Liu, Xiang-Yang; Misra, Amit</p> <p>2015-01-01</p> <p><span class="hlt">Al</span>N nanolayers in sputter deposited {111}<span class="hlt">Al/Al</span>N/TiN multilayers exhibit the metastable zinc-blende-structure (z-<span class="hlt">Al</span>N). Based on density function theory calculations, the growth of the z-<span class="hlt">Al</span>N is ascribed to the kinetically and energetically favored nitridation of the deposited aluminium layer. In situ nanoindentation of the as-deposited {111}<span class="hlt">Al/Al</span>N/TiN multilayers in a high-resolution transmission electron microscope revealed the z-<span class="hlt">Al</span>N to wurzite <span class="hlt">Al</span>N phase transformation through collective glide of Shockley partial dislocations on every two {111} planes of the z-<span class="hlt">Al</span>N. PMID:26681109</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015NatSR...518554L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015NatSR...518554L"><span id="translatedtitle">Growth and Stress-induced Transformation of Zinc blende <span class="hlt">Al</span>N Layers in <span class="hlt">Al-Al</span>N-TiN Multilayers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Nan; Yadav, Satyesh K.; Wang, Jian; Liu, Xiang-Yang; Misra, Amit</p> <p>2015-12-01</p> <p><span class="hlt">Al</span>N nanolayers in sputter deposited {111}<span class="hlt">Al/Al</span>N/TiN multilayers exhibit the metastable zinc-blende-structure (z-<span class="hlt">Al</span>N). Based on density function theory calculations, the growth of the z-<span class="hlt">Al</span>N is ascribed to the kinetically and energetically favored nitridation of the deposited aluminium layer. In situ nanoindentation of the as-deposited {111}<span class="hlt">Al/Al</span>N/TiN multilayers in a high-resolution transmission electron microscope revealed the z-<span class="hlt">Al</span>N to wurzite <span class="hlt">Al</span>N phase transformation through collective glide of Shockley partial dislocations on every two {111} planes of the z-<span class="hlt">Al</span>N.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26681109','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26681109"><span id="translatedtitle">Growth and Stress-induced Transformation of Zinc blende <span class="hlt">Al</span>N Layers in <span class="hlt">Al-Al</span>N-TiN Multilayers.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Li, Nan; Yadav, Satyesh K; Wang, Jian; Liu, Xiang-Yang; Misra, Amit</p> <p>2015-01-01</p> <p><span class="hlt">Al</span>N nanolayers in sputter deposited {111}<span class="hlt">Al/Al</span>N/TiN multilayers exhibit the metastable zinc-blende-structure (z-<span class="hlt">Al</span>N). Based on density function theory calculations, the growth of the z-<span class="hlt">Al</span>N is ascribed to the kinetically and energetically favored nitridation of the deposited aluminium layer. In situ nanoindentation of the as-deposited {111}<span class="hlt">Al/Al</span>N/TiN multilayers in a high-resolution transmission electron microscope revealed the z-<span class="hlt">Al</span>N to wurzite <span class="hlt">Al</span>N phase transformation through collective glide of Shockley partial dislocations on every two {111} planes of the z-<span class="hlt">Al</span>N. PMID:26681109</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JMEP...24.4083L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JMEP...24.4083L"><span id="translatedtitle">Effects of <span class="hlt">Al</span> Contents on Carburization Behavior and Corrosion Resistance of Ti<span class="hlt">Al</span> Alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liao, Cui Jiao; He, Yue Hui; Ming, Xing Zu</p> <p>2015-10-01</p> <p>Ti<span class="hlt">Al</span> alloys with <span class="hlt">Al</span> contents of 30.7, 37, 46.5, and 54.2 at.% were carburized. Corrosion resistance of the untreated and the carburized Ti<span class="hlt">Al</span> alloys was comparatively analyzed. The phase and microstructure of the carburized Ti<span class="hlt">Al</span> alloys were studied by x-ray diffraction and scanning electron microscopy, respectively. Electrochemical corrosion behavior of the untreated and the carburized Ti<span class="hlt">Al</span> alloys was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy. Experimental results indicate that different <span class="hlt">Al</span> contents bring about distinct microstructure of the carburized layers. The lower <span class="hlt">Al</span> content leads to the formation of the thicker binary carbides and the thinner Ti2<span class="hlt">Al</span>C phase. Additionally, the lower <span class="hlt">Al</span> content leads to higher corrosion resistance in the untreated and the carburized states.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19970023021','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19970023021"><span id="translatedtitle">Tensile Behavior of <span class="hlt">Al</span>2o3/feal + B and <span class="hlt">Al</span>2o3/fecraly Composites</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Draper, S. L.; Eldridge, J. I.; Aiken, B. J. M.</p> <p>1995-01-01</p> <p>The feasibility of <span class="hlt">Al</span>2O3/Fe<span class="hlt">Al</span> + B and <span class="hlt">Al</span>2O3/FeCr<span class="hlt">Al</span>Y composites for high-temperature applications was assessed. The major emphasis was on tensile behavior of both the monolithics and composites from 298 to 1100 K. However, the study also included determining the chemical compatibility of the composites, measuring the interfacial shear strengths, and investigating the effect of processing on the strength of the single-crystal <span class="hlt">Al</span>2O3 fibers. The interfacial shear strengths were low for <span class="hlt">Al</span>203/Fe<span class="hlt">Al</span> + B and moderate to high for <span class="hlt">Al</span>203/FeCr<span class="hlt">Al</span>Y. The difference in interfacial bond strengths between the two systems affected the tensile behavior of the composites. The strength of the <span class="hlt">Al</span>203 fiber was significantly degraded after composite processing for both composite systems and resulted in poor composite tensile properties. The ultimate tensile strength (UTS) values of the composites could generally be predicted with either rule of mixtures (ROM) calculations or existing models when using the strength of the etched-out fiber. The <span class="hlt">Al</span>2O3/Fe<span class="hlt">Al</span> + B composite system was determined to be unfeasible due to poor interfacial shear strengths and a large mismatch in coefficient of thermal expansion (CTE). Development of the <span class="hlt">Al</span>2O3/FeCr<span class="hlt">Al</span>Y system would require an effective diffusion barrier to minimize the fiber strength degradation during processing and elevated temperature service.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ClinicalTrials.gov/ct2/show/study/NCT00821132','CLINICALTRIALS'); return false;" href="https://ClinicalTrials.gov/ct2/show/study/NCT00821132"><span id="translatedtitle">Genetics of Familial and Sporadic <span class="hlt">ALS</span></span></a></p> <p><a target="_blank" href="http://www.clinicaltrials.gov/ct/screen/SimpleSearch">ClinicalTrials.gov</a></p> <p></p> <p>2016-03-21</p> <p>Amyotrophic Lateral Sclerosis (<span class="hlt">ALS</span>); Familial Amyotrophic Lateral Sclerosis; Amyotrophic Lateral Sclerosis With Frontotemporal Dementia; Lou Gehrig's Disease; Motor Neuron Disease; Primary Lateral Sclerosis</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20425287','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20425287"><span id="translatedtitle">Psychiatric aspects of amyotrophic lateral sclerosis (<span class="hlt">ALS</span>).</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Norris, Lorenzo; Que, Guinevere; Bayat, Elham</p> <p>2010-06-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is a progressive disorder characterized by degeneration of motor neurons. Given the severe nature of <span class="hlt">ALS</span>, many believed that patients would suffer from a high level of depression and a low quality of life. However, research into the psychological health of patients with <span class="hlt">ALS</span> has shown that this is not the case. This article reviews the state of current knowledge as it pertains to the psychological health of <span class="hlt">ALS</span> patients in four broad areas: quality of life, personality characteristics, emotional reactions, and end-of-life choices. PMID:20425287</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1994PhyB..193...25W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1994PhyB..193...25W"><span id="translatedtitle">Antiferromagnetic properties of Eu<span class="hlt">Al</span> 2</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wada, H.; Shiga, M.</p> <p>1994-01-01</p> <p>The magnetization, specific heat, thermal expansion and electrical resistivity have been measured for Eu<span class="hlt">Al</span> 2. Anomalies associated with the antiferromagnetic transition were observed in their temperature dependence at or below 30 K. The thermal and transport properties were analyzed by the effective Debye temperature model, in which the temperature dependence of ? D is taken into account. It is shown that the s-f exchange interaction of Eu<span class="hlt">Al</span> 2 is considerably smaller than in Gd<span class="hlt">Al</span> 2. The anomalous magnetization process of Eu<span class="hlt">Al</span> 2 is also presented and discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26053104','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26053104"><span id="translatedtitle">Hepatocyte growth factor measurement in <span class="hlt">AL</span> amyloidosis.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Abraham, Julie; Desport, Estelle; Rigaud, Charlotte; Marin, Benoit; Bender, Sébastien; Lacombe, Corinne; Moreau, Stéphane; Yagoubi, Fatima; Bordessoule, Dominique; Lavergne, David; Bridoux, Frank; Jaccard, Arnaud</p> <p>2015-01-01</p> <p>Hepatocyte growth factor (HGF) is a pro-angiogenic cytokine activated by tissue-type plasminogen activator (tPA) that might play a role in the progression of multiple myeloma (MM). Preliminary studies indicated that serum HGF levels were higher in patients with <span class="hlt">AL</span> amyloidosis (<span class="hlt">AL</span>) compared to those with MM. The aim of the present study was to determine whether HGF is a relevant marker of diagnosis and prognosis in <span class="hlt">AL</span>. HGF serum levels were measured at diagnosis in patients with monoclonal gammopathy (MG) without <span class="hlt">AL</span> (76 controls), or with biopsy-proven systemic <span class="hlt">AL</span> (69 patients). HGF serum levels were significantly higher in patients with <span class="hlt">AL</span> compared to controls, respectively, 11.2?ng/mL [min: 0.95-max: 200.4] versus 1.4?ng/mL [min: 0.82-max: 6.2] (p?<?0.0001). The threshold value of 2.2?ng/mL conferred optimal sensitivity (88%) and specificity (95%) to differentiate <span class="hlt">AL</span> and monoclonal gammopathy of undetermined significance (MGUS) patients. Serum HGF concentrations were correlated positively with the severity of cardiac involvement and the serum level of monoclonal light chains. These data suggest that HGF measurement could be used in patients with MG to detect <span class="hlt">AL</span> or to reinforce a clinical suspicion of <span class="hlt">AL</span> and to guide indications for diagnostic tissue biopsies. PMID:26053104</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JaJAP..49a0201S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JaJAP..49a0201S"><span id="translatedtitle">Dissolution Behavior of <span class="hlt">Al</span> and Formation Process of Zn<span class="hlt">Al</span>2O4 Phases in <span class="hlt">Al</span>2O3-Doped ZnO Sintered Bodies</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shirouzu, Keita; Kawamoto, Tohru; Enomoto, Naoya; Hojo, Junichi</p> <p>2010-01-01</p> <p><span class="hlt">Al</span>-doped ZnO sintered bodies, which were doped with 0-2 mol % <span class="hlt">Al</span>2O3, were prepared from a powder mixture. <span class="hlt">Al</span> could dissolve in ZnO grains uniformly and a fraction of <span class="hlt">Al</span> tended to segregate along ZnO grain boundaries when the <span class="hlt">Al</span> concentration was low. The decrease in the [c/a] lattice ratio suggested that the solubility of <span class="hlt">Al</span> in ZnO increased with increasing concentration of <span class="hlt">Al</span>2O3. The solubility of <span class="hlt">Al</span> reached the limit when <span class="hlt">Al</span>2O3 was doped at more than 1 mol %. Zn<span class="hlt">Al</span>2O4 particles appeared before the solubility of <span class="hlt">Al</span> reached the limit, indicating that the dissolution of <span class="hlt">Al</span> and the formation of Zn<span class="hlt">Al</span>2O4 phases occurred simultaneously in the <span class="hlt">Al</span>2O3-ZnO sintering process.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19970022133','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19970022133"><span id="translatedtitle">Processing and Mechanical Properties of Directionally Solidified Ni<span class="hlt">Al/NiAl</span>Ta Alloys</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Johnson, D. R.; Oliver, B. F.; Noebe, R. D.; Whittenberger, J. D.</p> <p>1994-01-01</p> <p>Promising creep strengths were found for a directionally solidified Ni<span class="hlt">Al-NiAl</span>Ta alloy when compared to other Ni<span class="hlt">Al</span> based intermetallics. The directionally solidified alloy had an off-eutectic composition that resulted in microstructures consisting of Ni<span class="hlt">Al</span> dendrites surrounded by aligned eutectic regions. The room temperature toughness of the two phase alloy was similar to that of polycrystalline Ni<span class="hlt">Al</span> even with the presence of the brittle Laves phase Ni<span class="hlt">Al</span>Ta. Alloying additions that may improve the room temperature toughness by producing multiphase alloys are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JMBM...24...18F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JMBM...24...18F"><span id="translatedtitle">Strengthening of <span class="hlt">Al</span> and <span class="hlt">Al</span>-Mg alloy wires by melt inoculation with <span class="hlt">Al</span>/MgB2 nanocomposite</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Florián-Algarín, David; Marrero, Raúl; Padilla, Alexandra; Suárez, Oscar Marcelo</p> <p>2015-12-01</p> <p>This study hinges on the feasibility of strengthening <span class="hlt">Al</span> and <span class="hlt">Al</span>-Mg wires by adding <span class="hlt">Al</span> nanocomposite pellets containing MgB2 nanoparticles into the melt upon fabrication. These MgB2 nanoparticles were obtained by fragmentation using a high-energy ball mill, and were, afterward, mechanically alloyed with pure aluminum. The resulting MgB2/<span class="hlt">Al</span> nanocomposite pellets were sintered at 260°C to be subsequently added into molten aluminum and an <span class="hlt">Al</span>-Mg alloy melt. Cold rolling intercalated with stepwise annealing allowed the fabrication of 1 mm diameter wires with a final area reduction of 96%. Mechanical and physical properties of the treated wire specimens were compared to those of similarly processed pure aluminum wire. The ultimate tensile strength of the treated wires increased approximately double fold with respect to untreated wires at the expense of some loss in electrical conductivity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JMEP...24..426N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JMEP...24..426N"><span id="translatedtitle">Evaluation of Methods of Soldering <span class="hlt">Al</span>Si and <span class="hlt">Al</span>Si-SiC Particle Composite <span class="hlt">Al</span> Foams</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nowacki, Jerzy; Moraniec, Kacper</p> <p>2015-01-01</p> <p>The cellular structure and unique properties of aluminum foams are the reason of their numerous applications and interests in respect of their joining. The paper includes the characterization of the essence of properties and application of aluminum and aluminum composite foams, the limitations, and possibilities of their soldering. The aim of the research is the consideration of methods of soldering <span class="hlt">Al</span>Si foams and <span class="hlt">Al</span>Si-SiC composite foams, and the joint structure. EDS and XRD investigations of the <span class="hlt">Al</span>Si-SiC composite foams' joints were done. The possibility of soldering <span class="hlt">Al</span>Si9 foams and <span class="hlt">Al</span>Si9-SiC composite foams using S-Bond 220 solder was confirmed, and higher tensile strength of the joint than the parent material was also ascertained</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li class="active"><span>5</span></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_5 --> <div id="page_6" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="101"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2000MMTA...31.2369X','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2000MMTA...31.2369X"><span id="translatedtitle">Design and fabrication of W-Mo-Ti-Ti<span class="hlt">Al-Al</span> system functionally graded material</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Xiong, Huaping; Zhang, Lianmeng; Chen, Lidong; Hirai, Toshio; Yuan, Runzhang</p> <p>2000-09-01</p> <p>To obtain a kind of functionally graded material (FGM) with a density gradient, the W-Mo-Ti-Ti<span class="hlt">Al-Al</span> system graded material was designed, and the powder metallurgy method was chosen for its fabrication. The sintering of W, W-Mo, and Mo-Ti alloys at low temperature was studied, and then the approximately wholly dense W-Mo-Ti-Ti<span class="hlt">Al</span> system FGM was achieved by one-step sintering at 1473 K for 1 hour under a pressure of 30 MPa. It was found that through sintering at 1473 K, mainly the mechanical mixtures of W and Mo were formed in W-Mo alloys. In Mo-Ti alloys, the newly designed Fe-<span class="hlt">Al</span> sintering aids not only have an important effect on the densification of the alloys, but also contribute to the formation of the (Mo, Ti) solid solution. However, the solid-solution reaction that occurred in Mo-Ti alloys was still insufficient. During the sintering of Ti + Ti<span class="hlt">Al</span>, the chemical reaction of Ti + Ti<span class="hlt">Al</span> ? <span class="hlt">Al</span>Ti2 was induced within the sintered body. The W-Mo-Ti-Ti<span class="hlt">Al-Al</span> system FGM was finally fabricated by joining of the Ti<span class="hlt">Al</span> side of the sintered W-Mo-Ti-Ti<span class="hlt">Al</span> system FGM to metal <span class="hlt">Al</span> with an <span class="hlt">Al</span>-based brazing filler metal, and its density changed quasi-continuously within the large range from 17.15 to 2.70 g/cm3.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1149231','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1149231"><span id="translatedtitle">Quantitatively Probing the <span class="hlt">Al</span> Distribution in Zeolites</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Vjunov, Aleksei; Fulton, John L.; Huthwelker, Thomas; Pin, Sonia; Mei, Donghai; Schenter, Gregory K.; Govind, Niranjan; Camaioni, Donald M.; Hu, Jian Z.; Lercher, Johannes A.</p> <p>2014-06-11</p> <p>The degree of substitution of Si4+ by <span class="hlt">Al</span>3+ in the oxygen-terminated tetrahedra (<span class="hlt">Al</span> T-sites) of zeolites determines the concentration of ion-exchange and Brønsted acid sites. As the location of the tetrahedra and the associated subtle variations in bond angles influence the acid strength, quantitative information about <span class="hlt">Al</span> T-sites in the framework is critical to rationalize catalytic properties and to design new catalysts. A quantitative analysis is reported that uses a combination of extended X-ray absorption fine structure (EXAFS) analysis and 27<span class="hlt">Al</span> MAS NMR spectroscopy supported by DFT-based molecular dynamics simulations. To discriminate individual <span class="hlt">Al</span> atoms, sets of ab initio EXAFS spectra for various T-sites are generated from DFT-based molecular dynamics simulations allowing quantitative treatment of the EXAFS single- and multiple-photoelectron scattering processes out to 3-4 atom shells surrounding the <span class="hlt">Al</span> absorption center. It is observed that identical zeolite types show dramatically different <span class="hlt">Al</span>-distributions. A preference of <span class="hlt">Al</span> for T-sites that are part of one or more 4-member rings in the framework over those T-sites that are part of only 5- and 6-member rings in the HBEA150 sample has been determined from a combination of these methods. This work was supported by the U. S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences & Biosciences.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=%22youth+population+growth%22+OR+%22u.s.+national+security%22+OR+%22potential+impacts%22+OR+%22presidential+administration%22+OR+%22middle+east%22&pg=6&id=EJ997797','ERIC'); return false;" href="http://eric.ed.gov/?q=%22youth+population+growth%22+OR+%22u.s.+national+security%22+OR+%22potential+impacts%22+OR+%22presidential+administration%22+OR+%22middle+east%22&pg=6&id=EJ997797"><span id="translatedtitle">Diana <span class="hlt">Al</span>-Hadid: Identity and Heritage</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Jungerberg, Tom; Smith, Anna; Borsh, Colleen</p> <p>2012-01-01</p> <p>Diana <span class="hlt">Al</span>-Hadid's sculptures reflect the many locations, cultures, histories, and mythologies that have shaped her as an artist. In large-scale works which have the appearance of architectural ruins, <span class="hlt">Al</span>-Hadid employs imagery drawn from many diverse interests including science and technology, history, and literature. She also incorporates images and…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25193032','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25193032"><span id="translatedtitle">Sporadic and hereditary amyotrophic lateral sclerosis (<span class="hlt">ALS</span>).</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ajroud-Driss, Senda; Siddique, Teepu</p> <p>2015-04-01</p> <p>Genetic discoveries in <span class="hlt">ALS</span> have a significant impact on deciphering molecular mechanisms of motor neuron degeneration. The identification of SOD1 as the first genetic cause of <span class="hlt">ALS</span> led to the engineering of the SOD1 mouse, the backbone of <span class="hlt">ALS</span> research, and set the stage for future genetic breakthroughs. In addition, careful analysis of <span class="hlt">ALS</span> pathology added valuable pieces to the <span class="hlt">ALS</span> puzzle. From this joint effort, major pathogenic pathways emerged. Whereas the study of TDP43, FUS and C9ORF72 pointed to the possible involvement of RNA biology in motor neuron survival, recent work on P62 and UBQLN2 refocused research on protein degradation pathways. Despite all these efforts, the etiology of most cases of sporadic <span class="hlt">ALS</span> remains elusive. Newly acquired genomic tools now allow the identification of genetic and epigenetic factors that can either increase <span class="hlt">ALS</span> risk or modulate disease phenotype. These developments will certainly allow for better disease modeling to identify novel therapeutic targets for <span class="hlt">ALS</span>. This article is part of a Special Issue entitled: Neuromuscular Diseases: Pathology and Molecular Pathogenesis. PMID:25193032</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080047349','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080047349"><span id="translatedtitle">Durability Assessment of Ti<span class="hlt">Al</span> Alloys</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Draper, Susan L.; Lerch, Bradley A.</p> <p>2008-01-01</p> <p>The durability of Ti<span class="hlt">Al</span> is a prime concern for the implementation of Ti<span class="hlt">Al</span> into aerospace engines. Two durability issues, the effect of high temperature exposure on mechanical properties and impact resistance, have been investigated and the results are summarized in this paper. Exposure to elevated temperatures has been shown to be detrimental to the room temperature ductility of gamma alloys with the most likely mechanisms being the ingress of interstitials from the surface. Fluorine ion implantation has been shown to improve the oxidation resistance of gamma alloys, and ideally it could also improve the environmental embrittlement of high Nb content Ti<span class="hlt">Al</span> alloys. The effect of F ion implantation on the surface oxidation and embrittlement of a third generation, high Nb content Ti<span class="hlt">Al</span> alloy (Ti-45<span class="hlt">Al</span>-5Nb-B-C) were investigated. Additionally, the ballistic impact resistance of a variety of gamma alloys, including Ti-48<span class="hlt">Al</span>-2Cr- 2Nb, Ti-47<span class="hlt">Al</span>-2Cr-2Nb, ABB-2, ABB-23, NCG359E, 95A and Ti-45<span class="hlt">Al</span>-5Nb-B-C was accessed. Differences in the ballistic impact properties of the various alloys will be discussed, particularly with respect to their manufacturing process, microstructure, and tensile properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=+%22youth+population+growth%22+OR+%22u.s.+national+security%22++OR+%22potential+impacts%22++OR+%22presidential+administration%22++OR+%22middle+east%22+&pg=6&id=EJ997797','ERIC'); return false;" href="http://eric.ed.gov/?q=+%22youth+population+growth%22+OR+%22u.s.+national+security%22++OR+%22potential+impacts%22++OR+%22presidential+administration%22++OR+%22middle+east%22+&pg=6&id=EJ997797"><span id="translatedtitle">Diana <span class="hlt">Al</span>-Hadid: Identity and Heritage</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Jungerberg, Tom; Smith, Anna; Borsh, Colleen</p> <p>2012-01-01</p> <p>Diana <span class="hlt">Al</span>-Hadid's sculptures reflect the many locations, cultures, histories, and mythologies that have shaped her as an artist. In large-scale works which have the appearance of architectural ruins, <span class="hlt">Al</span>-Hadid employs imagery drawn from many diverse interests including science and technology, history, and literature. She also incorporates images and…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016MS%26E..116a2012G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016MS%26E..116a2012G"><span id="translatedtitle">Contact hardening of <span class="hlt">Al</span> interlayer in laminated Mg/<span class="hlt">Al</span> composites during compressive and tensile loading</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gurevich, L.; Pronichev, D.; Trunov, M.</p> <p>2016-02-01</p> <p>The study presents result of the FEM simulation of Mg alloy/<span class="hlt">Al</span>/Ti alloy composite under tensile and compression loads. The simulation revealed the strength of <span class="hlt">Al</span> interlayer at its various thickness values.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940007975','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940007975"><span id="translatedtitle">Ni<span class="hlt">Al</span> alloys for structural uses</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Koss, D. A.</p> <p>1991-01-01</p> <p>Alloys based on the intermetallic compound Ni<span class="hlt">Al</span> are of technological interest as high temperature structural alloys. These alloys possess a relatively low density, high melting temperature, good thermal conductivity, and (usually) good oxidation resistance. However, Ni<span class="hlt">Al</span> and Ni<span class="hlt">Al</span>-base alloys suffer from poor fracture resistance at low temperatures as well as inadequate creep strength at elevated temperatures. This research program explored macroalloying additions to Ni<span class="hlt">Al</span>-base alloys in order to identify possible alloying and processing routes which promote both low temperature fracture toughness and high temperature strength. Initial results from the study examined the additions of Fe, Co, and Hf on the microstructure, deformation, and fracture resistance of Ni<span class="hlt">Al</span>-based alloys. Of significance were the observations that the presence of the gamma-prime phase, based on Ni3<span class="hlt">Al</span>, could enhance the fracture resistance if the gamma-prime were present as a continuous grain boundary film or 'necklace'; and the Ni-35<span class="hlt">Al</span>-20Fe alloy was ductile in ribbon form despite a microstructure consisting solely of the B2 beta phase based on Ni<span class="hlt">Al</span>. The ductility inherent in the Ni-35<span class="hlt">Al</span>-20Fe alloy was explored further in subsequent studies. Those results confirm the presence of ductility in the Ni-35<span class="hlt">Al</span>-20Fe alloy after rapid cooling from 750 - 1000 C. However exposure at 550 C caused embrittlement; this was associated with an age-hardening reaction caused by the formation of Fe-rich precipitates. In contrast, to the Ni-35<span class="hlt">Al</span>-20Fe alloy, exploratory research indicated that compositions in the range of Ni-35<span class="hlt">Al</span>-12Fe retain the ordered B2 structure of Ni<span class="hlt">Al</span>, are ductile, and do not age-harden or embrittle after thermal exposure. Thus, our recent efforts have focused on the behavior of the Ni-35<span class="hlt">Al</span>-12Fe alloy. A second parallel effort initiated in this program was to use an alternate processing technique, mechanical alloying, to improve the properties of Ni<span class="hlt">Al</span>-alloys. Mechanical alloying in the conventional sense requires ductile powder particles which, through a cold welding and fracture process, can be dispersion strengthened by submicron-sized oxide particles. Using both the Ni-35<span class="hlt">Al</span>-Fe alloys to contain approx. 1 v/o Y2O3. Preliminary results indicate that mechanically alloyed and extruded Ni<span class="hlt">Al</span>-Fe + Y2O3 alloys when heat treated to a grain-coarsened condition, exhibit improved creep resistance at 1000 C when compared to Ni<span class="hlt">Al</span>; oxidation resistance comparable to Ni<span class="hlt">Al</span>; and fracture toughness values a factor of three better than Ni<span class="hlt">Al</span>. As a result of the research initiated on this NASA program, a subsequent project with support from Inco Alloys International is underway.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24472060','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24472060"><span id="translatedtitle">Opportunities for improving therapy development in <span class="hlt">ALS</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bruijn, Lucie; Cudkowicz, Merit</p> <p>2014-06-01</p> <p>In May 2013, The <span class="hlt">ALS</span> Association and The Northeast <span class="hlt">ALS</span> Consortium (NEALS) convened a meeting of stakeholders for a round-table discussion of ways to improve therapy development in <span class="hlt">ALS</span>. The following overview summarizes issues raised and potential new directions discussed at the meeting. We recommend that future phase II clinical trials in <span class="hlt">ALS</span> proceed when the proposed treatment is directed at targets that are likely to be involved in <span class="hlt">ALS</span> pathogenesis in a defined subgroup of patients, and be accompanied by one or more biomarkers to track both clinical progression and pharmacodynamic engagement of the target. Innovations in trial structure and design, and greater involvement of patient advocates, may also improve trials. PMID:24472060</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1984ApPhL..44..310C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1984ApPhL..44..310C"><span id="translatedtitle">Interaction in Cu/<span class="hlt">Al</span> and Pt/Cu/<span class="hlt">Al</span> thin films: Competing oxygen effects and preferential reaction between Pt and Cu<span class="hlt">Al</span> alloy</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chang, Chin-An</p> <p>1984-02-01</p> <p>The effects of oxygen on the interactions of the Cu-<span class="hlt">Al</span> thin-film system are studied using both Cu/<span class="hlt">Al</span> and Pt/Cu/<span class="hlt">Al</span> structures. For the Cu/<span class="hlt">Al</span> structure, oxygen-enhanced outdiffusion of <span class="hlt">Al</span> and accumulation of <span class="hlt">Al</span> on the Cu surface are observed. Using the Pt/Cu/<span class="hlt">Al</span> structure, however, no surface accumulation of <span class="hlt">Al</span> on Pt is observed; instead, the observed interdiffusion and alloy formation between Cu and <span class="hlt">Al</span> are both suppressed by oxygen. At increasing temperatures, <span class="hlt">Al</span> preferentially outdiffuses from the Cu<span class="hlt">Al</span> alloy to form a Pt <span class="hlt">Al</span> alloy with the top Pt layer. This last process is also suppressed by oxygen, similar to the binary Pt/<span class="hlt">Al</span> system reported previously. The mechanisms for the competing interactions and ambient effects observed are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19980019510','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19980019510"><span id="translatedtitle">Corrosion Studies of 2195 <span class="hlt">Al</span>-Li Alloy and 2219 <span class="hlt">Al</span> Alloy with Differing Surface Treatments</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Danford, M. D.; Mendrek, M. J.</p> <p>1998-01-01</p> <p>Corrosion studies of 2195 <span class="hlt">Al</span>-Li and 2219 <span class="hlt">Al</span> alloys have been conducted using the scanning reference electrode technique (SRET) and the polarization resistance (PR) technique. The SRET was used to study corrosion mechanisms, while corrosion rate measurements were studied with the PR technique. Plates of <span class="hlt">Al</span>203 blasted, soda blasted and conversion coated 2219 <span class="hlt">Al</span> were coated with Deft primer and the corrosion rates studied with the EIS technique. Results from all of these studies are presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015ApPhL.107y3502P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015ApPhL.107y3502P"><span id="translatedtitle">Experimental determination of tunneling characteristics and dwell times from temperature dependence of <span class="hlt">Al/Al</span>2O3/<span class="hlt">Al</span> junctions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Patiño, Edgar J.; Kelkar, N. G.</p> <p>2015-12-01</p> <p>Measurements of current-voltage (I-V) characteristics of a high quality <span class="hlt">Al/Al</span>2O3/<span class="hlt">Al</span> junction at temperatures ranging from 3.5 K to 300 K have been used to extract the barrier properties. Fitting results using Simmons's model led to a constant value of barrier width s ˜ 20.8 Å and a continuous increase in the barrier height with decreasing temperature. The latter is used to determine the energy band gap temperature dependence and average phonon frequency ? = 2.05 × 1013 s-1 in <span class="hlt">Al</span>2O3, which adds confidence to the precision of our measurements. The barrier parameters are used to extract the temperature dependent dwell times in tunneling (?D = 3.6 × 10-16 s at mid-barrier energies) and locate resonances above the barrier.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/296638','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/296638"><span id="translatedtitle">Effects of hydrogen absorption in TbNi<span class="hlt">Al</span> and UNi<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Bordallo, H.N.; Nakotte, H.; Schultz, A.; Kolomiets, A.V.; Havela, L.; Andreev, A.V.</p> <p>1998-12-31</p> <p>Although hydrides of intermetallic compounds are used extensively as hydrogen-storage media, little is known about the exact nature of metal-hydrogen interactions. However, this knowledge is of essential importance for the understanding of thermodynamics and other properties. Hydrides (deuterides) of TbNi<span class="hlt">Al</span> and UNi<span class="hlt">Al</span> have been widely studied because of drastic increase of magnetic ordering temperature under hydrogenation. Here the authors report neutron-diffraction results of the three deuterides, TbNi<span class="hlt">Al</span>D{sub 1.28}, TbNi<span class="hlt">Al</span>D{sub 0.8}a nd UNi<span class="hlt">Al</span>D{sub 2.23}.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20020071128','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20020071128"><span id="translatedtitle">Atomistic Modeling of Ru<span class="hlt">Al</span> and (RuNi) <span class="hlt">Al</span> Alloys</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Gargano, Pablo; Mosca, Hugo; Bozzolo, Guillermo; Noebe, Ronald D.; Gray, Hugh R. (Technical Monitor)</p> <p>2002-01-01</p> <p>Atomistic modeling of Ru<span class="hlt">Al</span> and Ru<span class="hlt">Al</span>Ni alloys, using the BFS (Bozzolo-Ferrante-Smith) method for alloys is performed. The lattice parameter and energy of formation of B2 Ru<span class="hlt">Al</span> as a function of stoichiometry and the lattice parameter of (Ru(sub 50-x)Ni(sub x)<span class="hlt">Al</span>(sub 50)) alloys as a function of Ni concentration are computed. BFS based Monte Carlo simulations indicate that compositions close to Ru25Ni25<span class="hlt">Al</span>50 are single phase with no obvious evidence of a miscibility gap and separation of the individual B2 phases.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5857468','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/5857468"><span id="translatedtitle">Extended <span class="hlt">Al</span>(Mn) solution in a rapidly solidified <span class="hlt">Al</span>-Li-Mn-Zr alloy</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Ruhr, M.; Baram, J.C. ); Lavernia, E.J. )</p> <p>1990-06-01</p> <p>This paper reports the effect of coolingrate on the extension of Mn solid solubility in <span class="hlt">Al</span> and on the relative amount of Mn<span class="hlt">Al</span> (Mn<span class="hlt">Al</span>{sub 6} and Mn<span class="hlt">Al</span>{sub 4}) secondary phases during gas atomization and spray deposition critically examined. An alloy of composition <span class="hlt">Al</span>-6.5Mn-2.3Li-0.65Zr (wt pct) currently being investigated for applications requiring high strength and low density at high temperatures was selected for this study. The material was exposed to various solidification histories by altering gas pressure and powder size during solidification.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/756425','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/756425"><span id="translatedtitle">A new discontinuously reinforced aluminum MMC: <span class="hlt">Al+Al</span>B{sub 2} flakes</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>HALL,AARON C.; ECONOMY,J.</p> <p>2000-06-08</p> <p>Development of a novel metal matrix composite based on the <span class="hlt">Al</span>-B alloy system has been undertaken. Preparation of this discontinuously reinforced material is based on the precipitation of high aspect ratio <span class="hlt">Al</span>B{sub 2} from an <span class="hlt">Al</span>-B alloy. This paper describes a number of efforts forced on preparing high volume fractions (> 30 v%) of <span class="hlt">Al</span>B{sub 2} in aluminum. New insights into the behavior of the <span class="hlt">Al</span>-B alloys system allowed this effort to be successful.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19910043314&hterms=1573&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3D%2526%25231573','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19910043314&hterms=1573&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3D%2526%25231573"><span id="translatedtitle">Reaction of Ti and Ti-<span class="hlt">Al</span> alloys with alumina</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Misra, Ajay K.</p> <p>1991-01-01</p> <p>The reaction of single-crystal <span class="hlt">Al</span>2O3 with pure Ti and Ti-<span class="hlt">Al</span> alloys with different <span class="hlt">Al</span> concentrations was examined in the temperature range of 1173 to 1573 K. Significant reaction occurred between <span class="hlt">Al</span>2O3 and the Ti-<span class="hlt">Al</span> alloys with <span class="hlt">Al</span> concentrations lower than that corresponding to the gamma-Ti<span class="hlt">Al</span> phase. The reaction mechanism was determined to be simultaneous diffusion of <span class="hlt">Al</span> and atomic oxygen from <span class="hlt">Al</span>2O3 into Ti and the Ti-<span class="hlt">Al</span> alloys.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6394628','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6394628"><span id="translatedtitle">Transition element modifications of <span class="hlt">Al</span>-Li</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Gayle, F.W.; Levoy, N.F.; Vandersande, J.B.</p> <p>1987-05-01</p> <p>The development of aluminum-lithium metallurgy has led to alloys with unsurpassed combinations of density, specific strength, and specific modulus. This paper describes recent advances in the modification of aluminum-lithium binary alloys through additions of the Group IV-A transition metals (titanium, zirconium, and hafnium). These elements lead to a duplex precipitation hardening behavior through the formation of <span class="hlt">Al</span>3Li and <span class="hlt">Al</span>3(TM,Li) (TM = transition element) which act as strengthening precipitates. The influence of the duplex structure on deformation mechanisms and the improvement of mechanical properties in these systems is illustrated by using results for the <span class="hlt">Al</span>-Li-Zr system. 12 references.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10191071','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10191071"><span id="translatedtitle">Ni{sub 3}<span class="hlt">Al</span> aluminide alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Liu, C.T.</p> <p>1993-10-01</p> <p>This paper provides a brief review of the recent progress in research and development of Ni{sub 3}<span class="hlt">Al</span> and its alloys. Emphasis has been placed on understanding low ductility and brittle fracture of Ni{sub 3}<span class="hlt">Al</span> alloys at ambient and elevated temperatures. Recent studies have resulted in identifying both intrinsic and extrinsic factors governing the fracture behavior of Ni{sub 3}<span class="hlt">Al</span> alloys. Parallel efforts on alloy design using physical metallurgy principles have led to properties for structural use. Industrial interest in these alloys is high, and examples of industrial involvement in processing and utilization of these alloys are briefly mentioned.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26613179','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26613179"><span id="translatedtitle">Arsenate uptake by <span class="hlt">Al</span> nanoclusters and other <span class="hlt">Al</span>-based sorbents during water treatment.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mertens, Jasmin; Rose, Jérôme; Wehrli, Bernhard; Furrer, Gerhard</p> <p>2016-01-01</p> <p>In many parts of the world, arsenic from geogenic and anthropogenic sources deteriorates the quality of drinking water resources. Effective methods of arsenic removal include adsorption and coagulation with iron- and aluminum-based materials, of which polyaluminum chloride is widely employed as coagulant in water treatment due to its low cost and high efficiency. We compared the arsenic uptake capacity and the arsenic bonding sites of different <span class="hlt">Al</span>-based sorbents, including <span class="hlt">Al</span> nanoclusters, polyaluminum chloride, polyaluminum granulate, and gibbsite. Extended X-ray absorption fine structure (EXAFS) spectroscopy revealed that As(V) forms bidentate-binuclear complexes in interaction with all <span class="hlt">Al</span>-based removal agents. The octahedral configuration of nanoclusters and the distribution of sorption sites remain the same in all types of removal agents consisting of nano-scale <span class="hlt">Al</span> oxyhydroxide particles. The obtained distances for As(V)-O and As(V)-<span class="hlt">Al</span> agreed with previously published data and were found to be 1.69 ± 0.02 Å and 3.17-3.21 Å, respectively. Our study suggests that As(V) binds to <span class="hlt">Al</span> nanoclusters as strongly as to <span class="hlt">Al</span> oxide surfaces. The As sorption capacity of <span class="hlt">Al</span> nanoclusters was found to be very similar to that of <span class="hlt">Al</span> clusters in a polyaluminum chloride. The most efficient <span class="hlt">Al</span>-based sorbents for arsenic removal were <span class="hlt">Al</span> nanoclusters, followed by polyaluminum granulate. PMID:26613179</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_6 --> <div id="page_7" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="121"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010SCPMA..53...49D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010SCPMA..53...49D"><span id="translatedtitle">Characterization of different-<span class="hlt">Al</span>-content <span class="hlt">Al</span>GaN/GaN heterostructures on sapphire</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ding, Guojian; Guo, Liwei; Xing, Zhigang; Chen, Yao; Xu, Peiqiang; Jia, Haiqiang; Zhou, Junming; Chen, Hong</p> <p>2010-01-01</p> <p><span class="hlt">Al</span> x Ga1- x N/GaN high-electron-mobility transistor (HEMT) structures with <span class="hlt">Al</span> composition ranging from x = 0.13 to 0.36 are grown on sapphire substrates by low-pressure metalorganic chemical vapor deposition (LP-MOCVD). The effects of <span class="hlt">Al</span> content on crystal quality, surface morphology, optical and electrical characteristics of the <span class="hlt">Al</span>GaN/GaN heterostructures have been analyzed. Although high <span class="hlt">Al</span>-content (36%) heterostructure exhibits a distinguished photoluminescence peak related to recombination between the two-dimensional electron gas and photoexcited holes (2DEG-h), its crystal quality and rough surface morphology are poor. 2DEG mobility increases with the <span class="hlt">Al</span> content up to 26% and then it apparently decreases for high <span class="hlt">Al</span>-content (36%) <span class="hlt">Al</span>GaN/GaN heterostructure. The increase of sheet carrier density with the increase of <span class="hlt">Al</span> content has been observed. A high mobility at room temperature of 2105 cm2/V s with a sheet carrier density of n s = 1.10 × 1013 cm-2, for a 26% <span class="hlt">Al</span>-content <span class="hlt">Al</span>GaN/GaN heterostructure has been obtained, which is approaching state-of-the-art for HEMT grown on SiC. Sheet resistance as low as 274 ?/? has also been achieved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013Nanot..24I5203X','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013Nanot..24I5203X"><span id="translatedtitle">High-performance nonvolatile <span class="hlt">Al/Al</span>Ox/CdTe:Sb nanowire memory device</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Xie, Chao; Nie, Biao; Zhu, Long; Zeng, Long-Hui; Yu, Yong-Qiang; Wang, Xian-He; Fang, Qun-Ling; Luo, Lin-Bao; Wu, Yu-Cheng</p> <p>2013-09-01</p> <p>Here we demonstrate a room temperature processed nonvolatile memory device based on an <span class="hlt">Al/Al</span>Ox/CdTe:Sb nanowire (NW) heterojunction. Electrical analysis shows an echelon hysteresis composed of a high-resistance state (HRS) and a low-resistance state (LRS), which can allow it to write and erase data from the device. The conductance ratio is as high as 106, with a retention time of 3 × 104 s. Moreover, the SET voltages ranged from +6 to +8 V, whilst the RESET voltage ?0 V. In addition, flexible memory nano-devices on PET substrate with comparable switching performance at bending condition were fabricated. XPS analysis of the <span class="hlt">Al/Al</span>Ox/CdTe:Sb NW heterojunction after controlled Ar+ bombardment reveals that this memory behavior is associated with the presence of ultra-thin <span class="hlt">Al</span>Ox film. This <span class="hlt">Al/Al</span>Ox/CdTe:Sb NW heterojunction will open up opportunities for new memory devices with different configurations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012HTMP...31....3B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012HTMP...31....3B"><span id="translatedtitle">Contribution to Kinetics of Superplastic Deformation of Dispersion Strengthened <span class="hlt">Al-Al</span>4C3 System</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Besterci, Michal; Varchola, Marián; Ková?, Ladislav; Velgosová, Oksana</p> <p>2012-02-01</p> <p>The influence of temperature at constant strain rate has been evaluated with respect to superplastic behavior of dispersion strengthened <span class="hlt">Al-Al</span>4C3 composite with 4 vol.% of <span class="hlt">Al</span>4C3 phase. The dispersion strengthened <span class="hlt">Al-Al</span>4C3 was prepared by powder metallurgy. Material can be characterized by grain size around 1 ?m and dispersed particle <span class="hlt">Al</span>4C3 size around 50 nm. This material showed superplastic behavior for strain rate 10-3 s-1 by test temperature 573 K. The mechanism of superplastic deformation was also investigated. For the presented material with low content of disperse particle slip on grain boundaries is typical. The final fracture is transcrystalline with dimples with their mean size 1.25 ?m. The dimples are initialized by <span class="hlt">Al</span>4C3 particles in size from 40 to 50 nm.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/971365','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/971365"><span id="translatedtitle">Interdiffusion in Diffusion Couples: U-Mo v. <span class="hlt">Al</span> and <span class="hlt">Al</span>-Si</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>D. D. Keiser, Jr.; E. Perez; B. Yao; Y. H. Sohn</p> <p>2009-11-01</p> <p>Interdiffusion and microstructural development in the U-Mo-<span class="hlt">Al</span> system was examined using solid-tosolid diffusion couples consisting of U-7wt.%Mo, U-10wt.%Mo and U-12wt.%Mo vs. pure <span class="hlt">Al</span>, annealed at 600°C for 24 hours. The influence of Si alloying addition (up to 5 wt.%) in <span class="hlt">Al</span> on the interdiffusion microstructural development was also examined using solid-to-solid diffusion couples consisting of U-7wt.%Mo, U-10wt.%Mo and U-12wt.%Mo vs. pure <span class="hlt">Al</span>, <span class="hlt">Al</span>-2wt.%Si, and <span class="hlt">Al</span>-5wt.%Si annealed at 550°C up to 20 hours. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron probe microanalysis (EPMA) were employed to examine the development of a very fine multiphase intermetallic layer. In ternary U-Mo-<span class="hlt">Al</span> diffusion couples annealed at 600°C for 24 hours, interdiffusion microstructure varied of finely dispersed UAl3, UAl4, U6Mo4<span class="hlt">Al</span>43, and UMo2<span class="hlt">Al</span>20 phases while the average composition throughout the interdiffusion zone remained constant at approximately 80 at.% <span class="hlt">Al</span>. Interdiffusion microstructure observed by SEM/TEM analyses and diffusion paths drawn from concentration profiles determined by EPMA appear to deviate from the assumption of “local thermodynamic equilibrium,” and suggest that interdiffusion occurs via supersaturated UAl4 followed by equilibrium transformation into UAl3, U6Mo4<span class="hlt">Al</span>43, UAl4 and UMo2<span class="hlt">Al</span>20 phases. Similar observation was made for U-Mo vs. <span class="hlt">Al</span> diffusion couples annealed at 550°C. The addition of Si (up to 5 wt.%) in <span class="hlt">Al</span> significantly reduced the thickness of the intermetallic layer by changing the constituent phases of the interdiffusion zone developed in U-Mo vs. <span class="hlt">Al</span>-Si diffusion couples. Specifically, the formation of (U,Mo)(<span class="hlt">Al</span>,Si)3 with relatively large solubility for Mo and Si, along with UMo2<span class="hlt">Al</span>20 phases was observed along with disappearance of U6Mo4<span class="hlt">Al</span>43 and UAl4 phases. Simplified understanding based on U-<span class="hlt">Al</span>, U-Si, and Mo-Si binary phase diagrams is discussed in the light of the beneficial effect of Si alloying addition.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012JAP...111f3708H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012JAP...111f3708H"><span id="translatedtitle">Electroforming and Ohmic contacts in <span class="hlt">Al-Al</span>2O3-Ag diodes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hickmott, T. W.</p> <p>2012-03-01</p> <p>Electroforming of metal-insulator-metal (MIM) diodes is a non-destructive dielectric breakdown process that changes the diode from its initial high resistance state (HRS) to a low resistance state (LRS). After electroforming, resistance switching memories (RSMs) use voltages to switch from HRS to LRS and back. Many MIM combinations are proposed for use in RSMs. In many cases conduction in the LRS is nearly temperature independent at low temperatures; an Ohmic contact with a barrier to electron injection of ˜0 eV results from electroforming. Electroforming of <span class="hlt">Al-Al</span>2O3-Ag diodes with amorphous anodic <span class="hlt">Al</span>2O3 thicknesses between 12 and 41 nm has been studied. Two anodizing electrolytes have been used; 0.1 M ammonium pentaborate (bor-H2O) and a solution of 0.1 M of ammonium pentaborate per liter of ethylene glycol (bor-gly). Polarization of <span class="hlt">Al</span>2O3 and negative charge in <span class="hlt">Al</span>2O3 are much larger when <span class="hlt">Al</span>2O3 is formed in bor-H2O solution than when <span class="hlt">Al</span> is anodized in bor-gly solution. Electroforming of <span class="hlt">Al-Al</span>2O3-Ag diodes results in an Ohmic contact at the <span class="hlt">Al-Al</span>2O3 interface, voltage-controlled negative resistance (VCNR) in the current-voltage (I-V) characteristics, electroluminescence (EL), and electron emission into vacuum (EM) from filamentary conducting channels. Two distinct modes of electroforming occur for <span class="hlt">Al-Al</span>2O3-Ag diodes. α-forming occurs for 2.5 V ≲ VS ≲ 5 V, where VS is the applied voltage. It is characterized by an abrupt current jump with the simultaneous appearance of EL and EM. β-forming occurs for VS ≳ 7 V. I-V curves, EL, and EM develop gradually and are smaller than for α-forming. Electroforming occurs more readily for diodes with <span class="hlt">Al</span>2O3 formed in bor-H2O that have greater defect densities. Fully developed I-V curves have similar VCNR, EL, and EM after α-forming or β-forming. A model is proposed in which excited states of F-centers, oxygen vacancies in amorphous anodic <span class="hlt">Al</span>2O3, form defect conduction bands. Electroforming that results in an Ohmic contact requires injection of positive charge at the <span class="hlt">Al-Al</span>2O3 interface. α-forming is the result of ionization of F-center recombination centers with energies that are close to the <span class="hlt">Al</span> Fermi level. Hole injection by high-field ionization of valence band states of <span class="hlt">Al</span>2O3 causes β-forming.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/792926','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/792926"><span id="translatedtitle">12th Annual <span class="hlt">ALS</span> Users' Association Meeting</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Robinson, Arthur L.</p> <p>1999-12-17</p> <p>Science took the front seat as 219 Advanced Light Source (<span class="hlt">ALS</span>) users and staff gathered on Monday and Tuesday, October 18 and 19 for the twelfth annual users' meeting. The bulk of the meeting was dedicated to reports on science at the <span class="hlt">ALS</span>. Packed into two busy days were 31 invited oral presentations and 80 submitted poster presentations, as well as time to visit 24 vendor booths. The oral sessions were dedicated to environmental science, chemical dynamics, biosciences, magnetic materials, and atomic and molecular science. In addition, there was an <span class="hlt">ALS</span> highlights session that emphasized new results and a session comprising highlights from the young scientists who will carry the <span class="hlt">ALS</span> into the future.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/18625409','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/18625409"><span id="translatedtitle">Glial cells in <span class="hlt">ALS</span>: the missing link?</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Raibon, Elsa; Todd, Lisa Marie; Möller, Thomas</p> <p>2008-08-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) was initially known as Charcot's sclerosis, named after the French neurobiologist and physician Jean-Martin Charcot who first described this type of muscular atrophy in the early nineteenth century. In the United States, <span class="hlt">ALS</span> became widely known as Lou Gehrig's disease after the famous baseball player who succumbed to the disease in the late 1930s. Currently, <span class="hlt">ALS</span> is the most common motor neuron disease, with a worldwide incidence of 8 cases per 100,000 population per year. Familial forms constitute approximately 5% to 10% of all cases. Onset increases with age, with a peak in the seventh decade and a slight preponderance (relative risk, 1.3-1.5) among men compared with women. Rapid progression of motor neuron loss leads to death an average of 3 to 5 years after symptom onset. The cause of <span class="hlt">ALS</span> remains unknown and there is still no curative therapy. PMID:18625409</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23186722','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23186722"><span id="translatedtitle">Transplantation of mesenchymal stem cells in <span class="hlt">ALS</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mazzini, Letizia; Vercelli, Alessandro; Ferrero, Ivana; Boido, Marina; Cantello, Roberto; Fagioli, Franca</p> <p>2012-01-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is a devastating incurable, neurodegenerative disease that targets motor neurons (MNs) in the primary motor cortex, brainstem, and spinal cord, leading to muscle atrophy, paralysis, and death due to respiratory failure within 2-5 years. Currently, there is no cure for <span class="hlt">ALS</span>. The development of a therapy that can support or restore MN function and attenuate toxicity in the spinal cord provides the most comprehensive approach for treating <span class="hlt">ALS</span>. Mesenchymal stem cells might be suitable for cell therapy in <span class="hlt">ALS</span> because of their immunomodulatory and protective properties. In this review, the authors discuss the major challenges to the translation of in vitro and animal studies of MSCs therapy in the clinical setting. PMID:23186722</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3866720','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3866720"><span id="translatedtitle"><span class="hlt">ALS</span> and Oxidative Stress: The Neurovascular Scenario</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Thakur, Keshav; Gupta, Pawan Kumar</p> <p>2013-01-01</p> <p>Oxidative stress and angiogenic factors have been placed as the prime focus of scientific investigations after an establishment of link between vascular endothelial growth factor promoter (VEGF), hypoxia, and amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) pathogenesis. Deletion of the hypoxia-response element in the vascular endothelial growth factor promoter and mutant superoxide dismutase 1 (SOD1) which are characterised by atrophy and muscle weakness resulted in phenotype resembling human <span class="hlt">ALS</span> in mice. This results in lower motor neurodegeneration thus establishing an important link between motor neuron degeneration, vasculature, and angiogenic molecules. In this review, we have presented human, animal, and in vitro studies which suggest that molecules like VEGF have a therapeutic, diagnostic, and prognostic potential in <span class="hlt">ALS</span>. Involvement of vascular growth factors and hypoxia response elements also highlights the converging role of oxidative stress and neurovascular network for understanding and treatment of various neurodegenerative disorders like <span class="hlt">ALS</span>. PMID:24367722</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4439492','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4439492"><span id="translatedtitle"><span class="hlt">AL</span> Amyloidosis Complicated by Persistent Oral Bleeding</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Marconcini, Luiz Antonio Liarte; Stewart, Forrest Marc; Sonntag, Lisa; Stevens, Emily; Burwick, Nicholas</p> <p>2015-01-01</p> <p>A case of amyloid light chain (<span class="hlt">AL</span>) amyloidosis is presented here with uncontrolled bleeding after a nonsurgical dental procedure, most likely multifactorial in nature, and consequently treated with a multidisciplinary approach. PMID:26064714</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Anthropology+AND+epistemology&pg=5&id=EJ310992','ERIC'); return false;" href="http://eric.ed.gov/?q=Anthropology+AND+epistemology&pg=5&id=EJ310992"><span id="translatedtitle">On Dobbert et <span class="hlt">al</span>, 'Cultural Transmission...'</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Gearing, Frederick</p> <p>1984-01-01</p> <p>Criticizes Dobbert et <span class="hlt">al</span>'s model of cultural transmission (presented in earlier article) as being a species of social physics. Suggests improvements to the model, notably that observation and analysis at the emic level be taken into account. (RDN)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015IJT....36.3037L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015IJT....36.3037L"><span id="translatedtitle">Thermal Conductivity of <span class="hlt">Al</span>-Salt Composites</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Peng; Zhang, Mei; Wang, Lijun; Seetharaman, Seshadri</p> <p>2015-11-01</p> <p>With a view to examine the possibility of estimating the content of entrapped metallic aluminium in the salt cake from aluminium remelting, the thermal diffusivity of reference composites of KCl-NaCl-<span class="hlt">Al</span> was measured as a function of aluminium metal content at room temperature. The thermal conductivity of the reference composites was found to increase with the metallic <span class="hlt">Al</span> content. The lumped parameter model approach was carried out to discuss the influence of different geometry arrangements of each phase, viz. air, salts and metallic aluminium on the thermal conductivity. Application of the present results to industrial samples indicates that factors such as the interfacial condition of metallic <span class="hlt">Al</span> particles have to be considered in order to estimate the amount of entrapped <span class="hlt">Al</span> in the salt cake.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2650295','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2650295"><span id="translatedtitle">Substitutional alloy of Ce and <span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Zeng, Qiao-Shi; Ding, Yang; Mao, Wendy L.; Luo, Wei; Blomqvist, Andreas; Ahuja, Rajeev; Yang, Wenge; Shu, Jinfu; Sinogeikin, Stas V.; Meng, Yue; Brewe, Dale L.; Jiang, Jian-Zhong; Mao, Ho-kwang</p> <p>2009-01-01</p> <p>The formation of substitutional alloys has been restricted to elements with similar atomic radii and electronegativity. Using high-pressure at 298 K, we synthesized a face-centered cubic disordered alloy of highly dissimilar elements (large Ce and small <span class="hlt">Al</span> atoms) by compressing the Ce3<span class="hlt">Al</span> intermetallic compound >15 GPa or the Ce3<span class="hlt">Al</span> metallic glass >25 GPa. Synchrotron X-ray diffraction, Ce L3-edge absorption spectroscopy, and ab initio calculations revealed that the pressure-induced Kondo volume collapse and 4f electron delocalization of Ce reduced the differences between Ce and <span class="hlt">Al</span> and brought them within the Hume-Rothery (HR) limit for substitutional alloying. The alloy remained after complete release of pressure, which was also accompanied by the transformation of Ce back to its ambient 4f electron localized state and reversal of the Kondo volume collapse, resulting in a non-HR alloy at ambient conditions. PMID:19188608</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25802988','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25802988"><span id="translatedtitle">Continuous germanene layer on <span class="hlt">Al</span>(111).</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Derivaz, Mickael; Dentel, Didier; Stephan, Régis; Hanf, Marie-Christine; Mehdaoui, Ahmed; Sonnet, Philippe; Pirri, Carmelo</p> <p>2015-04-01</p> <p>Germanene, a 2D honeycomb structure similar to silicene, has been fabricated on <span class="hlt">Al</span>(111). The 2D germanene layer covers uniformly the substrate with a large coherence over the <span class="hlt">Al</span>(111) surface atomic plane. It is characterized by a (3 × 3) superstructure with respect to the substrate lattice, shown by low energy electron diffraction and scanning tunnelling microscopy. First-principles calculations indicate that the Ge atoms accommodate in a very regular atomic configuration with a buckled conformation. PMID:25802988</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3139582','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3139582"><span id="translatedtitle">Analysis of <span class="hlt">al</span>-2 Mutations in Neurospora</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Díaz-Sánchez, Violeta; Estrada, Alejandro F.; Trautmann, Danika; Limón, M. Carmen; Al-Babili, Salim; Avalos, Javier</p> <p>2011-01-01</p> <p>The orange pigmentation of the fungus Neurospora crassa is due to the accumulation of the xanthophyll neurosporaxanthin and precursor carotenoids. Two key reactions in the synthesis of these pigments, the formation of phytoene from geranylgeranyl pyrophosphate and the introduction of ? cycles in desaturated carotenoid products, are catalyzed by two domains of a bifunctional protein, encoded by the gene <span class="hlt">al</span>-2. We have determined the sequence of nine <span class="hlt">al</span>-2 mutant alleles and analyzed the carotenoid content in the corresponding strains. One of the mutants is reddish and it is mutated in the cyclase domain of the protein, and the remaining eight mutants are albino and harbor different mutations on the phytoene synthase (PS) domain. Some of the mutations are expected to produce truncated polypeptides. A strain lacking most of the PS domain contained trace amounts of a carotenoid-like pigment, tentatively identified as the squalene desaturation product diapolycopene. In support, trace amounts of this compound were also found in a knock-out mutant for gene <span class="hlt">al</span>-2, but not in that for gene <span class="hlt">al</span>-1, coding for the carotene desaturase. The cyclase activity of the <span class="hlt">AL</span>-2 enzyme from two albino mutants was investigated by heterologous expression in an appropriately engineered E. coli strain. One of the <span class="hlt">AL</span>-2 enzymes, predictably with only 20% of the PS domain, showed full cyclase activity, suggesting functional independence of both domains. However, the second mutant showed no cyclase activity, indicating that some alterations in the phytoene synthase segment affect the cyclase domain. Expression experiments showed a diminished photoinduction of <span class="hlt">al</span>-2 transcripts in the <span class="hlt">al</span>-2 mutants compared to the wild type strain, suggesting a synergic effect between reduced expression and impaired enzymatic activities in the generation of their albino phenotypes. PMID:21818281</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10175632','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10175632"><span id="translatedtitle">Performance of the <span class="hlt">ALS</span> injection system</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kim, C.H.</p> <p>1993-05-01</p> <p>The authors started commissioning the Advanced Light Source (<span class="hlt">ALS</span>) storage ring on January 11, 1993. The stored beam reached 60 mA on March 24, 1993 and 407 mA on April 9, 1993. The fast pace of storage ring commissioning can be attributed partially to the robust injection system. In this paper they describe the operating characteristics of the <span class="hlt">ALS</span> injection system.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25123918','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25123918"><span id="translatedtitle">Genetic architecture of <span class="hlt">ALS</span> in Sardinia.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Borghero, Giuseppe; Pugliatti, Maura; Marrosu, Francesco; Marrosu, Maria Giovanna; Murru, Maria Rita; Floris, Gianluca; Cannas, Antonino; Parish, Leslie D; Occhineri, Patrizia; Cau, Tea B; Loi, Daniela; Ticca, Anna; Traccis, Sebastiano; Manera, Umberto; Canosa, Antonio; Moglia, Cristina; Calvo, Andrea; Barberis, Marco; Brunetti, Maura; Pliner, Hannah A; Renton, Alan E; Nalls, Mike A; Traynor, Bryan J; Restagno, Gabriella; Chiò, Adriano</p> <p>2014-12-01</p> <p>Conserved populations, such as Sardinians, displaying elevated rates of familial or sporadic amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) provide unique information on the genetics of the disease. Our aim was to describe the genetic profile of a consecutive series of <span class="hlt">ALS</span> patients of Sardinian ancestry. All <span class="hlt">ALS</span> patients of Sardinian ancestry, identified between 2008 and 2013 through the Italian <span class="hlt">ALS</span> Genetic Consortium, were eligible to be included in the study. Patients and controls underwent the analysis of TARDBP, C9ORF72, SOD1, and FUS genes. Genetic mutations were identified in 155 out of 375 Sardinian <span class="hlt">ALS</span> cases (41.3%), more commonly the p.A382T and p.G295S mutations of TARDBP and the GGGGCC hexanucleotide repeat expansion of C9ORF72. One patient had both p.G295S and p.A382T mutations of TARDBP and 8 carried both the heterozygous p.A382T mutation of TARDBP and a repeat expansion of C9ORF72. Patients carrying the p.A382T and the p.G295S mutations of TARDBP and the C9ORF72 repeat expansion shared distinct haplotypes across these loci. Patients with cooccurrence of C9ORF72 and TARDBP p.A382T missense mutation had a significantly lower age at onset and shorter survival. More than 40% of all cases on the island of Sardinia carry a mutation of an <span class="hlt">ALS</span>-related gene, representing the highest percentage of <span class="hlt">ALS</span> cases genetically explained outside of Scandinavia. Clinical phenotypes associated with different genetic mutations show some distinctive characteristics, but the heterogeneity between and among families carrying the same mutations implies that <span class="hlt">ALS</span> manifestation is influenced by other genetic and nongenetic factors. PMID:25123918</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/862324','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/862324"><span id="translatedtitle">17th Annual <span class="hlt">ALS</span> Users' Association Meeting</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Robinson, Art; Tamura, Lori</p> <p>2004-11-29</p> <p>It's not exactly Russian roulette, but scheduling October events outdoors is not risk-free, even in usually sunny California. An overflow crowd of more than 400 registered users, <span class="hlt">ALS</span> staff, and vendors enjoyed a full indoor program featuring science highlights and workshops spread over two and a half days from October 18 to October 20. However, a major storm, heralding the onset of the San Francisco Bay Area rainy season, posed a few weather challenges for the events on the <span class="hlt">ALS</span> patio.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6395567','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6395567"><span id="translatedtitle">Magnetism of <span class="hlt">Al</span>-Mn quasicrystals</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Liu, F.; Khanna, S.N.; Magaud, L.; Jena, P. ); de Coulon, V.; Reuse, F. ); Jaswal, S.S.; He, X. ); Cyrot-Lackman, F. )</p> <p>1993-07-01</p> <p>The effect of symmetry and concentration of Mn on the magnetism of <span class="hlt">Al</span>-Mn quasicrystals has been investigated through self-consistent density-functional calculations using molecular clusters and supercell band-structure schemes. A single Mn atom surrounded by 54 <span class="hlt">Al</span> atoms in an icosahedral or a cuboctahedral structure is found to be nonmagnetic. However, as the Mn concentration is increased, moments develop on Mn sites whose magnitude and coupling depend on their location.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20406180','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20406180"><span id="translatedtitle">Clinical trials for neuroprotection in <span class="hlt">ALS</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Siciliano, G; Carlesi, C; Pasquali, L; Piazza, S; Pietracupa, S; Fornai, F; Ruggieri, S; Murri, L</p> <p>2010-07-01</p> <p>Owing to uncertainty on the pathogenic mechanisms underlying motor neuron degeneration in amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) riluzole remains the only available therapy, with only marginal effects on disease survival. Here we review some of the recent advances in the search for disease-modifying drugs for <span class="hlt">ALS</span> based on their putative neuroprotective effetcs. A number of more or less established agents have recently been investigated also in <span class="hlt">ALS</span> for their potential role in neuroprotection and relying on antiglutamatergic, antioxidant or antiapoptotic strategies. Among them Talampanel, beta-lactam antibiotics, Coenzyme Q10, and minocycline have been investigated. Progress has also been made in exploiting growth factors for the treatment of <span class="hlt">ALS</span>, partly due to advances in developing effective delivery systems to the central nervous system. A number of new therapies have also been identified, including a novel class of compounds, such as heat-shock protein co-inducers, which upregulate cell stress responses, and agents promoting autophagy and mitochondriogenesis, such as lithium and rapamycin. More recently, alterations of mRNA processing were described as a pathogenic mechanism in genetically defined forms of <span class="hlt">ALS</span>, as those related to TDP-43 and FUS-TLS gene mutations. This knowledge is expected to improve our understanding of the pathogenetic mechanism in <span class="hlt">ALS</span> and developing more effective therapies. PMID:20406180</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_7 --> <div id="page_8" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="141"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26584004','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26584004"><span id="translatedtitle">Excitotoxicity in <span class="hlt">ALS</span>: Overstimulation, or overreaction?</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>King, Anna E; Woodhouse, Adele; Kirkcaldie, Matthew T K; Vickers, James C</p> <p>2016-01-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is an adult onset neurodegenerative disease that results in motor dysfunction and death, generally from respiratory failure. 90% of <span class="hlt">ALS</span> cases are sporadic with no known cause. Familial cases have been linked with mutations in several disparate classes of genes, including those involved in DNA/RNA metabolism, protein misfolding, oxidative stress and the cytoskeleton, leading to the proposition that <span class="hlt">ALS</span> could be a multi-factorial disease. However, alterations in excitability have been reported in all types of <span class="hlt">ALS</span> cases, and may be a common disease mechanism predisposing neurons to degeneration. Excitotoxicity has long been suspected as a mediator in the disease process, and may arise from changes in synaptic inputs, or alterations in the excitability of the neurons being stimulated. Although the glutamatergic system is widely recognised as a therapeutic avenue with the potential to extend lifespan and delay disease onset, the causes of altered excitability in <span class="hlt">ALS</span> are currently unclear and warrant further investigation. This article reviews current evidence of alterations to excitatory and inhibitory signalling in the cortex and spinal cord, and in the intrinsic excitability of motor neurons, in <span class="hlt">ALS</span>. PMID:26584004</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/516447','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/516447"><span id="translatedtitle">Modeling of precipitation in <span class="hlt">Al</span> alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Asta, M.; Foiles, S.M.; Wolfer, W.G.</p> <p>1996-10-01</p> <p>Objective was the development of a computational model of precipitation from a supersaturated alloy solid solution. The model is based on the formalism of chemical-reaction-rate theory combined with classical descriptions of precipitate thermodynamic properties and a mean-field treatment of diffusion-limited growht and coarsening. For the case of precipitation of <span class="hlt">Al</span>{sub 3}Sc in supersaturated <span class="hlt">Al</span>-Sc alloys, it is demonstrated how the model can be used to calculate number densities and size distributions of precipitates as a function of aging time and temperature, including effects of continuous cooling and thermally generated point defects. Application of the model to a specific alloy system requires knowledge of diffusion data, point defect energetics, and thermodynamic properties for bulk phases and interphase interfaces. For interfaces and point defects, thermodynamic data can be difficult to measure and reliable values of defect free energies are often unavailable. For this reason, part of the efforts were devoted to applying semiempirical and first-principles atomistic techniques to the calculation of interfacial and point-defect thermodynamic properties. This report discusses applications for interphase interfaces in the <span class="hlt">Al</span>-Ag, <span class="hlt">Al</span>-Sc, and <span class="hlt">Al</span>-Li alloy systems. We also describe atomistic work aimed at understanding the energetics of vacancy clusters in <span class="hlt">Al</span>. These clusters serve as sinks for isolated vacancies during aging and their growth can lead to more complex defects, such as dislocation loops, that act as heterogeneous nucleation sites.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1185327','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1185327"><span id="translatedtitle">Metastability in the Mg<span class="hlt">Al</span>2O4-<span class="hlt">Al</span>2O3 System</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Wilkerson, Dr. Kelley R.; Smith, Jeffrey D; Hemrick, James Gordon</p> <p>2014-01-01</p> <p>Aluminum oxide must take a spinel form ( -<span class="hlt">Al</span>2O3) at elevated temperatures in order for extensive solid solution to form between Mg<span class="hlt">Al</span>2O4 and -<span class="hlt">Al</span>2O3. The solvus line between Mg<span class="hlt">Al</span>2O4 and <span class="hlt">Al</span>2O3 has been dened at 79.6 wt% <span class="hlt">Al</span>2O3 at 1500C, 83.0 wt% <span class="hlt">Al</span>2O3 at 1600C, and 86.5 wt% <span class="hlt">Al</span>2O3 at 1700C. A metastable region has been dened at temperatures up to 1700C which could have signicant implications for material processing and properties. Additionally, initial processing could have major implications on nal chemistry. The spinel solid solution region has been extended to form an innite solid solution with <span class="hlt">Al</span>2O3 at elevated temperatures. A minimum in melting at 1975C and a chemistry of 96 wt% <span class="hlt">Al</span>2O3 rather than a eutectic is present, resulting in no eutectic crystal formation during solidication.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012AIPC.1426..275Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012AIPC.1426..275Z"><span id="translatedtitle">Air blast characteristics of laminated <span class="hlt">al</span> and NI-<span class="hlt">AL</span> casings</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Fan; Ripley, Robert; Wilson, William</p> <p>2012-03-01</p> <p>Air blast characteristics of <span class="hlt">Al</span> and Ni-<span class="hlt">Al</span> laminated materials were experimentally investigated in a 23 m3 closed chamber. Ni and <span class="hlt">Al</span> foils, 50 to 100 micrometers in thickness, were rolled and compacted to form a cylindrical casing with a density of 95% TMD through an explosive formation technique. Charges were prepared using 2 kg C4 explosive packed in the laminated casing to a metal-explosive mass ratio of 1.75. The blast pressure history measured on the chamber wall showed a double-shock front structure with a precursor shock followed by the primary blast. The front peak pressure for the Ni-<span class="hlt">Al</span> cased charge reaches 1.5-2 times that of the <span class="hlt">Al</span> cased, consistent with the larger fireball recorded for the Ni-<span class="hlt">Al</span> cased. The long time quasi-static explosion pressure (QSP) from the Ni- <span class="hlt">Al</span> cased charge is 0.8 of that of the <span class="hlt">Al</span> cased, due to half of <span class="hlt">Al</span> mass in the Ni-<span class="hlt">Al</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1986JNuM..141..401T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1986JNuM..141..401T"><span id="translatedtitle">Effects of neutron-irradiation on Mg<span class="hlt">Al</span> 2O 4 and <span class="hlt">Al</span> 20 3</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tucker, D. S.; Zocco, T.; Kise, C. D.; Kennedy, J. C.</p> <p>1986-11-01</p> <p>Specimens of Mg<span class="hlt">Al</span> 2O 4 and <span class="hlt">Al</span> 20 3 were irradiated to a neutron fluence of approximately 2×10 26 n/m 2, E > 0.1 MeV at 660 K. Tensile strength was seen to decrease by 25.6% for <span class="hlt">Al</span> 2O 3 and to increase by 24.4% for Mg<span class="hlt">Al</span> 2O 4. Density measurements revealed that <span class="hlt">Al</span> 2O 3 swelled by 3.22% while Mg<span class="hlt">Al</span> 2O 4 densified slightly (0.316%). Both exhibited mixed failure modes in both control and irradiated samples with a shift from intergranular to transgranular for Mg<span class="hlt">Al</span> 2O 4 and vice-versa for <span class="hlt">Al</span> 2O 3 upon irradiation. The Mg<span class="hlt">Al</span> 2O 4 damage microstructure consisted of interstitial dislocation loops and denuded grain boundaries. The microstructure of irradiated <span class="hlt">Al</span> 2O 3 revealed fine areas of damage assumed to be interstitial dislocation loops and voids. Strength and structural changes are correlated with the results and compared with previously obtained results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26742954','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26742954"><span id="translatedtitle">Next-generation sequencing of 28 <span class="hlt">ALS</span>-related genes in a Japanese <span class="hlt">ALS</span> cohort.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Nakamura, Ryoichi; Sone, Jun; Atsuta, Naoki; Tohnai, Genki; Watanabe, Hazuki; Yokoi, Daichi; Nakatochi, Masahiro; Watanabe, Hirohisa; Ito, Mizuki; Senda, Jo; Katsuno, Masahisa; Tanaka, Fumiaki; Li, Yuanzhe; Izumi, Yuishin; Morita, Mitsuya; Taniguchi, Akira; Kano, Osamu; Oda, Masaya; Kuwabara, Satoshi; Abe, Koji; Aiba, Ikuko; Okamoto, Koichi; Mizoguchi, Kouichi; Hasegawa, Kazuko; Aoki, Masashi; Hattori, Nobutaka; Tsuji, Shoji; Nakashima, Kenji; Kaji, Ryuji; Sobue, Gen</p> <p>2016-03-01</p> <p>We investigated the frequency and contribution of variants of the 28 known amyotrophic lateral sclerosis (<span class="hlt">ALS</span>)-related genes in Japanese <span class="hlt">ALS</span> patients. We designed a multiplex, polymerase chain reaction-based primer panel to amplify the coding regions of the 28 <span class="hlt">ALS</span>-related genes and sequenced DNA samples from 257 Japanese <span class="hlt">ALS</span> patients using an Ion Torrent PGM sequencer. We also performed exome sequencing and identified variants of the 28 genes in an additional 251 <span class="hlt">ALS</span> patients using an Illumina HiSeq 2000 platform. We identified the known <span class="hlt">ALS</span> pathogenic variants and predicted the functional properties of novel nonsynonymous variants in silico. These variants were confirmed by Sanger sequencing. Known pathogenic variants were identified in 19 (48.7%) of the 39 familial <span class="hlt">ALS</span> patients and 14 (3.0%) of the 469 sporadic <span class="hlt">ALS</span> patients. Thirty-two sporadic ALS patients (6.8%) harbored 1 or 2 novel nonsynonymous variants of <span class="hlt">ALS</span>-related genes that might be deleterious. This study reports the first extensive genetic screening of Japanese <span class="hlt">ALS</span> patients. These findings are useful for developing genetic screening and counseling strategies for such patients. PMID:26742954</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JAP...114w3702H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JAP...114w3702H"><span id="translatedtitle">Optical microcavities and enhanced electroluminescence from electroformed <span class="hlt">Al-Al</span>2O3-Ag diodes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hickmott, T. W.</p> <p>2013-12-01</p> <p>Electroluminescence (EL) and electron emission into vacuum (EM) occur when a non-destructive dielectric breakdown of <span class="hlt">Al-Al</span>2O3-Ag diodes, electroforming, results in the development of a filamentary region in which current-voltage (I-V) characteristics exhibit voltage-controlled negative resistance. The temperature dependence of I-V curves, EM, and, particularly, EL of <span class="hlt">Al-Al</span>2O3-Ag diodes with anodic <span class="hlt">Al</span>2O3 thicknesses between 12 nm and 30 nm, has been studied. Two filters, a long-pass (LP) filter with transmission of photons with energies less than 3.0 eV and a short-pass (SP) filter with photon transmission between 3.0 and 4.0 eV, have been used to characterize EL. The voltage threshold for EL with the LP filter, VLP, is ˜1.5 V. VLP is nearly independent of <span class="hlt">Al</span>2O3 thickness and of temperature and is 0.3-0.6 V less than the threshold voltage for EL for the SP filter, VSP. EL intensity is primarily between 1.8 and 3.0 eV when the bias voltage, VS ? 7 V. EL in the thinnest diodes is enhanced compared to EL in thicker diodes. For increasing VS, for diodes with the smallest <span class="hlt">Al</span>2O3 thicknesses, there is a maximum EL intensity, LMX, at a voltage, VLMX, followed by a decrease to a plateau. LMX and EL intensity at 4.0 V in the plateau region depend exponentially on <span class="hlt">Al</span>2O3 thickness. The ratio of LMX at 295 K for a diode with 12 nm of <span class="hlt">Al</span>2O3 to LMX for a diode with 25 nm of <span class="hlt">Al</span>2O3 is ˜140. The ratio of EL intensity with the LP filter to EL intensity with the SP filter, LP/SP, varies between ˜3 and ˜35; it depends on <span class="hlt">Al</span>2O3 thickness and VS. Enhanced EL is attributed to the increase of the spontaneous emission rate of a dipole in a non-resonant optical microcavity. EL photons interact with the Ag and <span class="hlt">Al</span> films to create surface plasmon polaritons (SPPs) at the metal-<span class="hlt">Al</span>2O3 interfaces. SPPs generate large electromagnetic fields in the filamentary region of the electroformed <span class="hlt">Al-Al</span>2O3-Ag diode, which then acts as an optical microcavity. A model is proposed for electronic processes in electroformed <span class="hlt">Al-Al</span>2O3-Ag diodes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1093153','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1093153"><span id="translatedtitle">Thermal Properties in the Mg<span class="hlt">Al</span>2O4-<span class="hlt">Al</span>2O3 System</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Wilkerson, Dr. Kelley R.; Smith, Jeffrey D; Hemrick, James Gordon</p> <p>2013-01-01</p> <p>Compositional effects on the thermal diffusivity in the Mg<span class="hlt">Al</span>2O4-<span class="hlt">Al</span>2O3 system were studied. The lowest thermal diffusivity, 0.0258 +/-5% cm/s, was measured between 79.8 and 83.9 wt% <span class="hlt">Al</span>2O3 quenched from various temperatures between 1500 and 1700C. All of the chemistries in this range extend past the solvus, but still form a singe super-saturated spinel solid solution, regardless of quenching tempeature. A super-saturated metastable solid solution region was observed at 1500, 1600, and 1700C extending to 83.9, 85.2, and 87.1 wt% <span class="hlt">Al</span>2O3, respectively. Beyond 83.9% <span class="hlt">Al</span>2O3 a significant increase in thermal diffusivity, 11.7%, was observed and its attributed to precipiation of <span class="hlt">Al</span>2O3 through spinodal decomposition.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JIEIC..94...93S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JIEIC..94...93S"><span id="translatedtitle">Process Capability Analysis of Vacuum Moulding for Development of <span class="hlt">Al-Al</span>2O3 MMC</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Singh, R.</p> <p>2013-01-01</p> <p>The purpose of the present study is to investigate process capability of vacuum moulding (VM) for development of <span class="hlt">Al-Al</span>2O3 metal matrix composite (MMC). Starting from the identification of component, prototypes were prepared (with three different input parameters namely: vacuum pressure; component volume and sand grit size to give output in form of dimensional accuracy). Measurements on the coordinate measuring machine helped in calculating the dimensional tolerances of the <span class="hlt">Al-Al</span>2O3 MMC prepared. Some important mechanical properties were also compared to verify the suitability of the components. Final components produced are acceptable as per ISO standard UNI EN 20286-I (1995). The results of study suggest that VM process lies in ±4.5 sigma (?) limit as regard to dimensional accuracy of <span class="hlt">Al-Al</span>2O3 MMC is concerned. This process ensures rapid production of pre-series technological prototypes and proof of concept at less production cost and time.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/7023556','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/7023556"><span id="translatedtitle">Tin/<span class="hlt">Al</span> sub 2 O sub 3 /Ti<span class="hlt">Al</span>On composite</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Han, K.</p> <p>1990-04-02</p> <p>The present invention pertains to novel improved density ceramic composites of TiN/<span class="hlt">Al</span>2O3/Ti<span class="hlt">Al</span>ON in which there is no spinel and no <span class="hlt">Al</span>N, but alpha-alumina, titanium nitride, and titanium aluminum oxynitride. In general, the improved density TiN/<span class="hlt">Al</span>2O3/Ti<span class="hlt">Al</span>ON ceramic composites of the invention are prepared by: adding aluminum isobutoxide (<span class="hlt">Al</span>(O-iBu)3) to a refluxing mixture of deionized water and formic acid at elevated temperatures to obtain an aluminum sol; casting the slurry in molds; drying the cast material and calcining it at about 600 C; screening the calcined material to minus 200 mesh; pressing pellets at about 10 KPsi, isostatically pressing them at about 40 KPsi; and sintering the pellets below 1,700 C to obtain sintered bodies having densities greater than about 4.2 g/cc.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015ApPhL.107g2105L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015ApPhL.107g2105L"><span id="translatedtitle">Scattering induced by <span class="hlt">Al</span> segregation in <span class="hlt">Al</span>GaN/GaN heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Xiwen; Ji, Dong; Lu, Yanwu</p> <p>2015-08-01</p> <p>The effect of <span class="hlt">Al</span> segregation near dislocations on the mobility of two-dimensional electron gas in <span class="hlt">Al</span>GaN/GaN heterostructure-based high-electron-mobility transistors was investigated. Exponentially varied composition fluctuation was effective in describing <span class="hlt">Al</span> segregation near dislocations when calculating scattering behavior. Mobility, which was limited by <span class="hlt">Al</span> segregation surrounding dislocation lines, was calculated to be in the order of 103 cm2/Vs to 106 cm2/Vs. Results indicated that the mobility in <span class="hlt">Al</span>GaN/GaN heterojunction was enhanced upon the reduction of dislocation density at low temperature. This study contributes to generating higher electron mobility in <span class="hlt">Al</span>GaN/GaN heterojunctions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3231464','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3231464"><span id="translatedtitle">Effects of <span class="hlt">Al</span>(III) and Nano-<span class="hlt">Al</span>13 Species on Malate Dehydrogenase Activity</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Yang, Xiaodi; Cai, Ling; Peng, Yu; Li, Huihui; Chen, Rong Fu; Shen, Ren Fang</p> <p>2011-01-01</p> <p>The effects of different aluminum species on malate dehydrogenase (MDH) activity were investigated by monitoring amperometric i-t curves for the oxidation of NADH at low overpotential using a functionalized multi-wall nanotube (MWNT) modified glass carbon electrode (GCE). The results showed that <span class="hlt">Al</span>(III) and <span class="hlt">Al</span>13 can activate the enzymatic activity of MDH, and the activation reaches maximum levels as the <span class="hlt">Al</span>(III) and <span class="hlt">Al</span>13 concentration increase. Our study also found that the effects of <span class="hlt">Al</span>(III) and <span class="hlt">Al</span>13 on the activity of MDH depended on the pH value and aluminum speciation. Electrochemical and circular dichroism spectra methods were applied to study the effects of nano-sized aluminum compounds on biomolecules. PMID:22163924</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008MMTA...39.1610H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008MMTA...39.1610H"><span id="translatedtitle">Microscopic Properties of Long-Period Ordering in <span class="hlt">Al</span>-Rich Ti<span class="hlt">Al</span> Alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hata, S.; Nakano, T.; Kuwano, N.; Itakura, M.; Matsumura, S.; Umakoshi, Y.</p> <p>2008-07-01</p> <p>The ordering mechanism of long-period superstructures (LPSs) in <span class="hlt">Al</span>-rich Ti<span class="hlt">Al</span> alloys has been investigated by high-resolution transmission electron microscopy (HRTEM). The LPSs are classified in terms of arrangements of base clusters with different shapes and compositions formed in Ti-rich (002) layers of L10-Ti<span class="hlt">Al</span> matrix: square Ti4<span class="hlt">Al</span>, fat rhombus Ti3<span class="hlt">Al</span>, and lean rhombus Ti2<span class="hlt">Al</span> type clusters. The HRTEM observations revealed that antiphase boundaries of long-range-ordered LPS domains and short-range-ordered microdomains are constructed by various space-filling arrangements of the base clusters. Such a microscopic property characterized by the base clusters and their arrangements is markedly analogous to that of the {left< {{text{1,1/2,0}}} rightrangle } * special-point ordering alloys such as Ni-Mo.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19890057866&hterms=charles+taylor&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dcharles%2Btaylor','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19890057866&hterms=charles+taylor&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dcharles%2Btaylor"><span id="translatedtitle">Lowest ionization potentials of <span class="hlt">Al</span>2</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bauschlicher, Charles W., Jr.; Barnes, Leslie A.; Taylor, Peter R.</p> <p>1989-01-01</p> <p>Potential curves for the lowest two electronic states, X 2Sigma(+)g and A 2Pi(u), of <span class="hlt">Al</span>2(+) were computed using complete active space SCF/multireference CI wave functions and large Gaussian basis sets. The lowest observable vertical ionization potential, to <span class="hlt">Al</span>2(+) X 2Sigma(+)g, of the <span class="hlt">Al</span>2 X 3 Pi(u) ground state is calculated to occur around 6.1 eV, in excellent agreement with the experimental range of 6.0 to 6.42 eV obtained in recent cluster ionization studies by Cox and co-workers. The second vertical ionization potential, to <span class="hlt">Al</span>2(+) A 2Pi(u), occurs near 6.4 eV, also within the experimental range. The adiabatic IP of 5.90 eV is in good agreement with the value of 5.8 to 6.1 eV deduced by Hanley and co-workers from the difference in thresholds between collision induced dissociation processes of <span class="hlt">Al</span>3(+). The computed IP values are somewhat larger than those deduced from branching ratios in cluster fragmentation experiments by Jarrold and co-workers. The observation of an ionization threshold below 6.42 eV is shown to be incompatible with an <span class="hlt">Al</span>2 ground electronic state assignment of 3Sigma(-)g, but the separation between the two lowest states of <span class="hlt">Al</span>2 is so small that it is likely that both are populated in the experiments, so that this does not provide unambiguous support for the recent theoretical assignment of the ground state as 3Pi(u).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19890001234','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19890001234"><span id="translatedtitle">The lowest ionization potentials of <span class="hlt">Al</span>2</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bauschlicher, Charles W., Jr.; Barnes, Leslie A.; Taylor, Peter R.</p> <p>1988-01-01</p> <p>Potential curves for the lowest two electronic states (X 2 sigma g + and A 2 pi u) of <span class="hlt">Al</span>2(+) were computed using complete active space SCF/multireference CI wave functions and large Gaussian basis sets. The lowest observable vertical ionization potential (to <span class="hlt">Al</span>2(+) X 2 sigma g +) of the <span class="hlt">Al</span>2 X 3 pi u ground state is calculated to occur around 6.1 eV, in excellent agreement with the experimental range of 6.0 to 6.42 eV obtained in recent cluster ionization studies by Cox and co-workers. The second vertical ionization potential (to <span class="hlt">Al</span>2(+) A 2 pi u) occurs near 6.4 eV, also within the experimental range. The adiabatic IP of 5.90 eV is in good agreement with the value of 5.8 to 6.1 eV deduced by Hanley and co-workers from the difference in thresholds between collision induced dissociation processes of <span class="hlt">Al</span>3(+). The computed IP values are somewhat larger than those deduced from branching ratios in cluster fragmentation experiments by Jarrold and co-workers. The observation of an ionization threshold below 6.42 eV is shown to be incompatible with an <span class="hlt">Al</span>2 ground electronic state assignment of 3 sigma g -, but the separation between the two lowest states of <span class="hlt">Al</span>2 is so small that it is likely that both are populated in the experiments, so that this does not provide unambiguous support for the recent theoretical assignment of the ground state as 3 pi u.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016CP....465....9S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016CP....465....9S"><span id="translatedtitle">Quantum chemical study of the reactions of <span class="hlt">Al</span>, <span class="hlt">Al</span>O and <span class="hlt">Al</span>OH with H2O2</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sharipov, Alexander S.; Starik, Alexander M.</p> <p>2016-02-01</p> <p>Quantum chemical calculations with the use of hybrid density functional with perturbative second-order correlation and dispersion correction are carried out to study the reactions of <span class="hlt">Al</span>, <span class="hlt">Al</span>O and <span class="hlt">Al</span>OH with the H2O2 molecule. The values of energy barriers are estimated by means of extrapolation to the basis set limit. The energetically favorable reaction pathways have been revealed during the examination of the potential energy surfaces. Complex character of the processes under study has been established. It has been found that the initial stages of the considered processes are barrierless. Appropriate rate constants for principal channels of the reactions under study have been estimated by using capture model and canonical variational theory. The Arrhenius approximations for these channels have been proposed for the temperature range T = 300-4000 K.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/919660','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/919660"><span id="translatedtitle">The Stability of <span class="hlt">Al</span> 11Sm3 (<span class="hlt">Al</span>4Sm) Phases in the <span class="hlt">Al</span>-Sm Binary System</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>S.H.Zhou; R.E. Napolitano</p> <p>2007-06-01</p> <p>The relative stability of <span class="hlt">Al</span>{sub 11}Sm{sub 3} (<span class="hlt">Al</span>{sub 4}Sm) intermetallic phases was experimentally investigated through a series of heat treatments followed by microstructural, microchemical, and X-ray diffraction (XRD) analyses. The principal findings are that the high-temperature tetragonal phase is stable from 1655 to 1333 K and that the low-temperature orthorhombic phases, {alpha} and {gamma}, have no range of full stability but are metastable with respect to the crystalline <span class="hlt">Al</span> and Sm reference states down to 0 K. Thermodynamic modeling is used to describe the relative energetics of stable and metastable phases along with the associated two-phase mixtures. Issues regarding transition energetics and kinetics are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19990008594','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19990008594"><span id="translatedtitle">Two-Phase (Ti<span class="hlt">Al+TiCrAl</span>) Coating Alloys for Titanium Aluminides</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Brady, Michael P. (Inventor); Smialek, James L. (Inventor); Brindley, William J. (Inventor)</p> <p>1998-01-01</p> <p>A coating for protecting titanium aluminide alloys, including the Ti<span class="hlt">Al</span> gamma + Ti3<span class="hlt">Al</span> (alpha(sub 2)) class, from oxidative attack and interstitial embrittlement at temperatures up to at least 1000 C. is disclosed. This protective coating consists essentially of titanium, aluminum. and chromium in the following approximate atomic ratio: Ti(41.5-34.5)<span class="hlt">Al</span>(49-53)Cr(9.5-12.5)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014RJPCA..88..729S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014RJPCA..88..729S"><span id="translatedtitle">Thermodynamic properties of alloys of the <span class="hlt">Al</span>-Co and <span class="hlt">Al</span>-Co-Sc systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shevchenko, M. A.; Berezutskii, V. V.; Ivanov, M. I.; Kudin, V. G.; Sudavtsova, V. S.</p> <p>2014-05-01</p> <p>Enthalpies of mixing for melts of the binary <span class="hlt">Al</span>-Co system at 1870 K in the range 0 < x Co < 0.25, and at 1620 K, 0 < x Co < 0.12, are investigated by means of isoperibolic calorimetry. Enthalpies of mixing for melts of the ternary <span class="hlt">Al</span>-Co-Sc system are investigated at 1870 K for sections <span class="hlt">Al</span>0.75(1 - x)Co0.25(1 - x)Sc x , 0 < x < 0.024, and <span class="hlt">Al</span>0.88(1 - x)Co0.12(1 - x)Sc x , 0 < x < 0.044. Using the literature data on the enthalpies of mixing for liquid and solid alloys, the activities of melt components, and the phase diagram of the <span class="hlt">Al</span>-Co system, the thermodynamic properties of liquid and solid alloys of the <span class="hlt">Al</span>-Co system over a wide range of temperatures and compositions are calculated using a software package of our own design, based on the model of ideal associated solutions (IAS). The enthalpies of mixing and the liquidus surface of the phase diagram of the ternary <span class="hlt">Al</span>-Co-Sc system over the interval of concentrations are estimated by modeling with data on binary boundary subsystems. All of the components of both the binary <span class="hlt">Al</span>-Co and ternary <span class="hlt">Al</span>-Co-Sc systems tend to interact with one another quite strongly: ? H min(<span class="hlt">Al</span>-Co) = -32.5 kJ/mol at x Co = 0.44; ? H min(<span class="hlt">Al</span>-Co-Sc) = -46 kJ/mol for <span class="hlt">Al</span>0.4Co0.3Sc0.3 (estimated).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4435199','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4435199"><span id="translatedtitle">Remarks on Peinado et <span class="hlt">al.'s</span> Analysis of J3Gen</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Garcia-Alfaro, Joaquin; Herrera-Joancomartí, Jordi; Melià-Seguí, Joan</p> <p>2015-01-01</p> <p>Peinado et <span class="hlt">al</span>. analyzed the security of the J3Gen pseudorandom number generator proposed by Melià-Seguí et <span class="hlt">al</span>., and claimed weaknesses regarding its security properties. They also presented a deterministic attack based on the decimation of the J3Gen output sequences. We show that the assumptions made by Peinado et <span class="hlt">al</span>. are not correct and that the proposed deterministic attack against J3Gen does not hold in practice. PMID:25781510</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_8 --> <div id="page_9" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="161"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25781510','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25781510"><span id="translatedtitle">Remarks on Peinado et <span class="hlt">al.'s</span> Analysis of J3Gen.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Garcia-Alfaro, Joaquin; Herrera-Joancomartí, Jordi; Melià-Seguí, Joan</p> <p>2015-01-01</p> <p>Peinado et <span class="hlt">al</span>. analyzed the security of the J3Gen pseudorandom number generator proposed by Melià-Seguí et <span class="hlt">al</span>., and claimed weaknesses regarding its security properties. They also presented a deterministic attack based on the decimation of the J3Gen output sequences. We show that the assumptions made by Peinado et <span class="hlt">al</span>. are not correct and that the proposed deterministic attack against J3Gen does not hold in practice. PMID:25781510</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2004NIMPB.218..158C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2004NIMPB.218..158C"><span id="translatedtitle">Depolarization currents in <span class="hlt">Al</span> 2O 3 and Mg<span class="hlt">Al</span> 2O 4 oxides</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Carvalhaes, R. P. M.; Rocha, M. S.; de Souza, S. S.; Blak, A. R.</p> <p>2004-06-01</p> <p>In the present work, dipole defects in ?-irradiated and thermally treated samples of <span class="hlt">Al</span> 2O 3 and Mg<span class="hlt">Al</span> 2O 4 oxides are investigated, applying the thermally stimulated depolarisation currents technique (TSDC). The TSDC spectra of Mg<span class="hlt">Al</span> 2O 4 doped with Fe 2+, Fe 3+, Co 2+, Cr 3+ and Mn 2+ show four bands at 130 K, 160 K, 250 K and 320 K, and the spectra of <span class="hlt">Al</span> 2O 3 doped with Mg 2+, Cr 3+ and Fe 3+ show bands between 230 K and 260 K. It has been observed that the bands at 130 K, 160 K and 250 K in Mg<span class="hlt">Al</span> 2O 4 spinel and that the 230 K and 240 K bands in <span class="hlt">Al</span> 2O 3 are related to dipole defects. The other bands are possibly related to different types of charge storage mechanisms (space-charge and interfacial polarisation) or deal with distributions in activation energies and/or in relaxation times. A thermal decrease of the TSDC bands for heat treatments above 1000 K has been observed. In Mg<span class="hlt">Al</span> 2O 4 spinel, the 250 K band could be recovered after ?-irradiation and the two dipole peaks in <span class="hlt">Al</span> 2O 3 were partially recovered. Thermal treatments affect the dipole aggregation processes in both oxides. Optical absorption (AO) results indicate that the presence of bands of water molecules in the infrared region obstructs the appearance of the TSDC bands in both <span class="hlt">Al</span> 2O 3 and Mg<span class="hlt">Al</span> 2O 4. The 250 K peak in Mg<span class="hlt">Al</span> 2O 4 was correlated to V-type centres and the 250 K peak in <span class="hlt">Al</span> 2O 3 to a substitutional Mg 2+ ion near a trapped hole localised on an adjacent oxygen ion.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26241194','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26241194"><span id="translatedtitle"><span class="hlt">Al</span>3AuIr: A New Compound in the <span class="hlt">Al</span>-Au-Ir System.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kadok, Joris; de Weerd, Marie-Cécile; Boulet, Pascal; Gaudry, Émilie; Grin, Yuri; Fournée, Vincent; Ledieu, Julian</p> <p>2015-08-17</p> <p>A new ternary phase with a composition of <span class="hlt">Al</span>3AuIr has been found in the <span class="hlt">Al</span>-rich area of the <span class="hlt">Al</span>-Au-Ir system. Differential thermal analysis indicates a melting point of 990 °C, and single-crystal X-ray diffraction measurements reveal that this ternary phase adopts a Ni2<span class="hlt">Al</span>3 structure type (space group P3̅m1) with a = 4.2584(5) Å and c = 5.1991(7) Å. This compound is isostructural to the <span class="hlt">Al</span>3Cu1.5Co0.5 phase also found in the <span class="hlt">Al</span>-rich part of the <span class="hlt">Al</span>-Cu-Co ternary diagram. Experimental evidence combined with ab initio calculations point toward an <span class="hlt">Al</span>3AuIr phase stabilized by a Hume-Rothery mechanism. Quantum chemical calculations indicate two-center and multicenter interactions in the <span class="hlt">Al</span>3AuIr phase. Layered distribution of two-center interactions separated by regions with four- and five-center bonds suggests a preferential cleavage of the material at puckered planes perpendicular to the [001] direction. PMID:26241194</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20001647','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20001647"><span id="translatedtitle">Microsample testing of single crystalline Ti-52 at% <span class="hlt">Al</span> and Ti-55.5 at% <span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zupan, M.; Dimiduk, D.M.; Hemker, K.J.</p> <p>1999-07-01</p> <p>Dislocation activity in two-phase commercial Ti<span class="hlt">Al</span> alloys occurs most readily in the {gamma}-Ti<span class="hlt">Al</span> phase, and measurements of the CRSS of single crystalline {gamma}-Ti<span class="hlt">Al</span> provides a solid foundation for understanding the mechanical performance of these alloys. Single crystals of {gamma}-Ti<span class="hlt">Al</span> with greater than 54.5 at% <span class="hlt">Al</span> have been grown using the optical float zone crystal growing technique, but single crystals with lower <span class="hlt">Al</span> content, closer to that of commercial alloys, have not. In the present study, polycrystalline ingots of Ti-52 at% <span class="hlt">Al</span> have been heat treated to form very large grains, and microsample tensile specimens, which have a nominal gage cross-section of 250{micro}m x 300{micro}m, a gage length of 250{micro}m and an overall length of 3 mm, have been machined from within single grains. Microsample high-temperature stress-strain curves for Ti-55.5 at% <span class="hlt">Al</span> single crystals oriented along the [001] and [010] are presented. Tensile test results for Ti-52 at% <span class="hlt">Al</span> tested at 1,073K along the[{bar 2}37], [{bar 1}73] and [{bar 3}44] orientations will also be discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19830003032&hterms=coal&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D80%26Ntt%3Dcoal','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19830003032&hterms=coal&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D80%26Ntt%3Dcoal"><span id="translatedtitle">High temperature deformation of Ni<span class="hlt">Al</span> and Co<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Nix, W. D.</p> <p>1982-01-01</p> <p>The high temperature mechanical properties of the aluminides are reviewed with respect to their potential as high temperature structural materials. It is shown that Ni<span class="hlt">Al</span> and Co<span class="hlt">Al</span> are substantially stronger than the pure metals Ni and Co at high temperatures and approach the strength of some superalloys, particularly when those superalloys are tested in "weak" directions. The factors that limit and control the high temperature strengths of Ni<span class="hlt">Al</span> and Co<span class="hlt">Al</span> are examined to provide a basis for the development of intermetallic alloys of this type.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19920053767&hterms=metal+heat+combustion&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dmetal%2Bheat%2Bcombustion','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19920053767&hterms=metal+heat+combustion&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dmetal%2Bheat%2Bcombustion"><span id="translatedtitle">Combustion synthesis of TiB2-<span class="hlt">Al</span>2O3-<span class="hlt">Al</span> composite materials</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Feng, H. J.; Moore, J. J.; Wirth, D. G.</p> <p>1991-01-01</p> <p>The oxide-aluminum exothermic reduction reaction is presently used in the combustion-synthesis of ceramic/metal composites. An excess of <span class="hlt">Al</span> is used in the reacting materials, which rapidly generate enough heat to exceed <span class="hlt">Al</span>'s melting point. The molten <span class="hlt">Al</span> thus evolved is allowed to infiltrate the porous ceramic matrix as the exothermic reaction proceeds; this feature of the process turns the disadvantage of high porosity levels in combustion-synthesized materials into an advantage. Attention is given to the system obtained with 3TiO2 + 3B2O3 + (10-x)<span class="hlt">Al</span> starting materials.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/100049','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/100049"><span id="translatedtitle">Solid state reaction of <span class="hlt">Al</span> and Zr in <span class="hlt">Al</span>/Zr multilayers: A calorimetry study</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Blobaum, K.J.; Weihs, T.P.; Barbee, T.W. Jr.; Wall, M.A.</p> <p>1995-04-14</p> <p>The exothermic, solid state reaction of <span class="hlt">Al</span> and Zr has been studied in thick <span class="hlt">Al</span>/Zr multilayers using Differential Scanning Calorimetry and X-ray diffraction. The multilayer samples were magnetron sputter deposited into highly textured alternate layers of <span class="hlt">Al</span> and Zr with nominal composition <span class="hlt">Al</span>{sub 3}Zr. The samples used in this study were 47{mu}m thick with a 427{Angstrom} period. When samples were isochronally scanned from 25 to 725C, a large exotherm at {approximately}350C was followed by one or two smaller exotherms at {approximately}650C. The first exotherm is dominated by a diffusion based reaction of <span class="hlt">Al</span> and Zr that produces two phases in isochronal scans: amorphous <span class="hlt">Al</span>-Zr and cubic <span class="hlt">Al</span>{sub 3}Zr, and two additional phases in isothermal anneals: <span class="hlt">Al</span>{sub 2}Zr and tetragonal <span class="hlt">Al</span>{sub 3}Zr. The exothermic heat from this multi-phase reaction is measured using isochronal scans and isothermal anneals, and the heat flow is analyzed using a 1-D diffusion based model. An average activation energy and a diffusion constant are determined. In the isothermal scans, the total exothermic heat increases linearly with {radical}time, and layer thicknesses vary linearly with heat.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2004APS..MARD33006C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2004APS..MARD33006C"><span id="translatedtitle">Photoemission from <span class="hlt">Al</span> Alloys during Tensile Deformation</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Cai, Mingdong; Langford, Stephen; Levine, Lyle; Dickinson, Thomas</p> <p>2004-03-01</p> <p>We report simultaneous measurements of strain and photoelectron emission intensity from high purity <span class="hlt">Al</span> (1350), <span class="hlt">Al</span>-Mg (5052), <span class="hlt">Al</span>-Mn (3003), <span class="hlt">Al</span>-Cu (2024) and <span class="hlt">Al</span>-Mg-Si (6061) alloys under uniaxial tension due to pulsed excimer laser radiation (248-nm). The photoemission signals are sensitive to deformation-induced changes in surface morphology, including the formation of slip lines and slip bands. In the early stages of deformation (strain Â¡Ü 0.03), the photoemission intensity increases gradually in a nonlinear fashion. Depending on sample composition and heat treatment, the photoemission intensity subsequently grows linearly until the accumulated strain reaches about 0.20. Finally, the photoemission intensity increases parabolically until failure. The onset of strain localization corresponds to the transition from linear to parabolic growth. A constitutional model incorporating microstructure evolution and work-hardening during tensile deformation is proposed to qualitatively interpret the growth of the photoemission signals as a function of strain. The photoemission signals from the tested alloys are interpreted in terms of the effect of surface treatment, work function, microstructure, and composition on the development of dislocation structures during deformation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/616445','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/616445"><span id="translatedtitle">Long range order and vacancy properties in <span class="hlt">Al</span>-rich Fe{sub 3}<span class="hlt">Al</span> and Fe{sub 3}<span class="hlt">Al</span>(Cr) alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kim, S.M.; Morris, D.G.</p> <p>1998-05-01</p> <p>Neutron powder diffraction measurements have been carried out in situ from room temperature to about 100 C in Fe28<span class="hlt">Al</span> (28 at.% <span class="hlt">Al</span>), Fe32.5<span class="hlt">Al</span> (32.5 at.% <span class="hlt">Al</span>) and Fe28<span class="hlt">Al</span>15Cr (28 at.% <span class="hlt">Al</span>, 5 at.% Cr) alloys. X-ray diffraction and TEM studies provided supporting information. The data were analyzed to obtain information about the temperature dependence of the DO{sub 3} and B2 long range order parameters, the location of the Cr atoms and their effect on the ordering energies, and on the vacancy formation and migration properties in Fe28<span class="hlt">Al</span> and Fe32.5<span class="hlt">Al</span> alloys. The location of the ternary alloying addition in DO{sub 3} and B2 ordered <span class="hlt">Al</span>-rich Fe{sub 3}<span class="hlt">Al</span> is shown to be consistent with considerations of interatomic bond energies.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014SurSc.624....1L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014SurSc.624....1L"><span id="translatedtitle">First-principle study of adhesion, wetting and bonding on <span class="hlt">Al/Al</span>3V(001) interface</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Jian; Qi, Yuning; Zhang, Ming; Zhou, Yong; Li, Xiao</p> <p>2014-06-01</p> <p>The adhesion, wetting, and bonding on fcc-<span class="hlt">Al</span>(001)/D022-<span class="hlt">Al</span>3V(001) interface were investigated using density functional calculations. Considering different terminations of <span class="hlt">Al</span>3V(001) (<span class="hlt">Al</span>- and <span class="hlt">Al</span> + V-terminated) and stacking sites (center-, hollow- and top-sites), six <span class="hlt">Al/Al</span>3V(001) models were calculated. For the models with same stacking site, <span class="hlt">Al</span> + V-terminated model has larger work of adhesion (Wad) than the <span class="hlt">Al</span>-terminated one. For the models with same termination, the work of adhesion decreases, and the interface energy (γint) increases as the order of top-, bridge- and center-sites. <span class="hlt">Al</span>-terminated-center-sited and <span class="hlt">Al</span> + V-terminated-center-sited models are more stable among six models. After complete structure relaxation, both models have the same epitaxial stacking style. Therefore, the both models can be regarded as of the same and most stable one (noted as CSI model), but separating along <span class="hlt">Al-Al</span> and <span class="hlt">Al-Al</span>+V inter-planes. Based on the perfect wetting and strong adhesion in CSI model, the heterogeneous nucleation of α-<span class="hlt">Al</span> on <span class="hlt">Al</span>3V(001) was interpreted in terms of crystallography and thermodynamics. The interfacial bonding was discussed with analysis of valence electron density distribution and partial density of states (PDOS). The bonding is mainly contributed from <span class="hlt">Al</span>V covalent bonds and <span class="hlt">AlAl</span> metallic interactions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26524174','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26524174"><span id="translatedtitle">The new structure type Gd3Ni7<span class="hlt">Al</span>14.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Pukas, Svitlana; Gladyshevskii, Roman</p> <p>2015-11-01</p> <p>The crystal structure of Gd3Ni7<span class="hlt">Al</span>14 (trigadolinium heptanickel tetradecaaluminide) belongs to a family of two-layer structures and can be described as an assembly of interpenetrating centred straight prisms. For the Ni atoms, trigonal prisms (<span class="hlt">Al</span>4Gd2 and <span class="hlt">Al</span>6) are observed, the <span class="hlt">Al</span> atoms are inside tetragonal (Ni2<span class="hlt">Al</span>2Gd4, Ni2<span class="hlt">Al</span>4Gd2, <span class="hlt">Al</span>4Gd4, Ni4<span class="hlt">Al</span>4 and <span class="hlt">Al</span>8) and pentagonal (Ni4<span class="hlt">Al</span>6 and <span class="hlt">Al</span>10) prisms, while the Gd atoms are at the centres of pentagonal (Ni4<span class="hlt">Al</span>6) and hexagonal (Ni4<span class="hlt">Al</span>8) prisms. In each case, the true coordination polyhedron is a capped prism, also including atoms from the same layer. The structural features of Gd3Ni7<span class="hlt">Al</span>14 are similar to those of the intermetallides PrNi2<span class="hlt">Al</span>3 and ZrNi<span class="hlt">Al</span>. In all these structures, Ni-centred trigonal prisms form infinite columns via common triangular faces. The columns share prism edges and form a three-dimensional framework with six-membered rings in the (001) plane in the case of the PrNi2<span class="hlt">Al</span>3 and ZrNi<span class="hlt">Al</span> types. In the case of Gd3Ni7<span class="hlt">Al</span>14, six-membered rings are also observed, but only two-thirds of the rings are interconnected via prism edges. PMID:26524174</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6542417','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6542417"><span id="translatedtitle">Combustion synthesis of Ti<span class="hlt">Al</span>-matrix composites in the Ti-<span class="hlt">Al</span>-BN system</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mabuchi, H.; Tsuda, H.; Nakayama, Y. . Dept. of Metallurgy and Materials Science)</p> <p>1995-01-15</p> <p>The intermetallic compound Ti<span class="hlt">Al</span> has attracted much attention for its potential use as a structural high-temperature material. However, its use has been limited because of its negligible low-temperature ductility and fracture toughness and low high-temperature strength and creep. To improve these properties, recently this compound has been made as a composite material containing a secondary phase such as boride, carbide, nitride, or oxide. Recently, combustion synthesis or self-propagating, high-temperature synthesis (SHS) using powder compacts has been developed to produce intermetallics or ceramics. It is also possible to form intermetallic-intermetallic, intermetallic-ceramic, or ceramic-ceramic composites from combustion reactions between corresponding elemental constituents. It has the advantage of an in-situ forming technique compared with conventional artificial composite production approaches. In the previous studies using elemental powders, combustion reaction was carried out to form intermetallic-ceramic composites in the Ti-<span class="hlt">Al</span>-C, or Ti-<span class="hlt">Al</span>-N system. The compacts of Ti and <span class="hlt">Al</span> powders with carbon powder or in gaseous nitrogen reacted exothermically, and formed a mixture product which had a fine distribution of the Ti[sub 2]<span class="hlt">Al</span>C or Ti[sub 2]<span class="hlt">Al</span>N particles in the matrix Ti<span class="hlt">Al</span> with a small amount of Ti[sub 3]<span class="hlt">Al</span>. The processing technique, therefore, is of interest as a combustion reaction synthesis to make in-situ intermetallic-based composite materials. In the present work, to investigate the effect of BN addition on the reaction of Ti And <span class="hlt">Al</span> powder mixtures, combustion synthesis of Ti<span class="hlt">Al</span>-matrix composites has been performed for the Ti-<span class="hlt">Al</span>-BN system.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/19089902','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/19089902"><span id="translatedtitle">Aquaporin-4 overexpression in rat <span class="hlt">ALS</span> model.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Nicaise, Charles; Soyfoo, Muhammad Shahnawaz; Authelet, Michèle; De Decker, Robert; Bataveljic, Danijela; Delporte, Christine; Pochet, Roland</p> <p>2009-02-01</p> <p>Onset of motoneuron death characterizing amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is closely linked to modified astrocytic and glial environments. Here, we show that in the spinal cord from transgenic rat overexpressing mutated human SOD1, aquaporin-4 mRNA and protein are specifically overexpressed in the gray matter at end stage of disease. Immunohistochemistry and double immunofluorescence allowed to detect, in the spinal cord gray matter of the <span class="hlt">ALS</span> rat, increased aquaporin-4 surrounding both vessel and motoneuron perikarya. The use of pre-embedding immunohistochemistry at electron microscopic level confirmed such localization associated with swollen astrocytic processes surrounding the vessels. The AQP4 immunohistochemical labeling surrounding several motoneuron perikarya was only seen in <span class="hlt">ALS</span> rats. Identification of this AQP4-positive cellular type remains unclear. PMID:19089902</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/676870','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/676870"><span id="translatedtitle">Boron strengthening in Fe<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Baker, I.; Li, X.; Xiao, H.; Klein, O.; Nelson, C.; Carleton, R.L.; George, E.P.</p> <p>1998-11-01</p> <p>The effect of boron on the strength of B2-structured Fe<span class="hlt">Al</span> is considered as a function of composition, grain size and temperature. Boron does not affect the concentrations of antisite atoms or vacancies present, with the former increasing and the latter decreasing with increasing deviation from the stoichiometric composition. When vacancies are absent, the strength increase per at. % B per unit lattice strain, {Delta}{sigma}/({Delta}c x {epsilon}) increases with increasing aluminum concentration, but when vacancies are present (>45 at. % <span class="hlt">Al</span>), {Delta}{sigma}/({Delta}c x {epsilon}) decreases again. Boron increases grain size strengthening in Fe<span class="hlt">Al</span>. B strengthening is roughly independent of temperature up to the yield strength peak but above the point, when diffusion-assisted deformation occurs, boron strengthening increases dramatically.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/434994','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/434994"><span id="translatedtitle">The mechanical properties of Fe<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Baker, I.; George, E.P.</p> <p>1996-12-31</p> <p>Only in the last few years has progress been made in obtaining reproducible mechanical properties data for Fe<span class="hlt">Al</span>. Two sets of observations are the foundation of this progress. The first is that the large vacancy concentrations that exist in Fe<span class="hlt">Al</span> at high temperature are easily retained at low temperature and that these strongly affect the low-temperature mechanical properties. The second is that RT ductility is adversely affected by water vapor. Purpose of this paper is not to present a comprehensive overview of the mechanical properties of Fe<span class="hlt">Al</span> but rather to highlight our understanding of key phenomena and to show how an understanding of the factors which control the yield strength and fracture behavior has followed the discovery of the above two effects. 87 refs, 9 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/11465925','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/11465925"><span id="translatedtitle">Calcium: the Darth Vader of <span class="hlt">ALS</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Appel, S H; Beers, D; Siklos, L; Engelhardt, J I; Mosier, D R</p> <p>2001-03-01</p> <p>Motor neuron dysfunction and loss in amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) have been attributed to several different mechanisms, including increased intracellular calcium, glutamate excitotoxicity, oxidative stress and free radical damage, mitochondrial dysfunction, and neurofilament aggregation and dysfunction of transport mechanisms. These alterations are not mutually exclusive, and increased calcium could be a common denominator. Furthermore, the selective vulnerability of spinal motor neurons and the relative sparing of eye motor neurons represent striking features of both sporadic and familial <span class="hlt">ALS</span>. Here we review the evidence that calcium homeostasis is altered in <span class="hlt">ALS</span>, and that low levels of the calcium binding proteins parvalbumin and calbindin-D28K contribute to selective vulnerability by decreasing the ability of motor neurons to handle an increased calcium load, with cell injury and death as the consequence. PMID:11465925</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20406177','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20406177"><span id="translatedtitle">Repetitive transcranial magnetic stimulation for <span class="hlt">ALS</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Dileone, M; Profice, P; Pilato, F; Ranieri, F; Capone, F; Musumeci, G; Florio, L; Di Iorio, R; Di Lazzaro, V</p> <p>2010-07-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is a devastating neurodegenerative disease affecting upper and lower motor neurons characterized by progressive weakness, respiratory failure and death within 3-5 years. It has been proposed that glutamate-related excitotoxicity may promote motor neuron death in <span class="hlt">ALS</span>. Glutamatergic circuits of the human motor cortex can be activated noninvasively using transcranial magnetic stimulation (TMS) of the brain, and repetitive TMS (rTMS) can produce changes in neurotransmission that outlast the period of stimulation. In recent years a remarkable number of papers about the potential effects of rTMS in several neurological disorders including <span class="hlt">ALS</span> has been published. Preliminary studies have shown that rTMS of the motor cortex, at frequencies that decrease cortical excitability, causes a slight slowing in the progression rate of <span class="hlt">ALS</span>, suggesting that these effects might be related to a diminution of glutamate-driven excitotoxicity. RTMS could also interfere with motor neuron death through different mechanisms: rTMS could modulate the production of brain-derived neurotrophic factor (BDNF), a potent survival factor for neurons, that in turn might represent a promoter of motor neuron sparing in <span class="hlt">ALS</span>. Despite some promising preliminary data, recent studies have demonstrated a lack of significant long-term beneficial effects of rTMS on neurological deterioration in <span class="hlt">ALS</span>. However, further studies are warranted to evaluate the potential efficacy of different protocols of motor cortex stimulation (in terms of technique, duration and frequency of stimulation), particularly during the early stages of the disease when the progression rate is more pronounced. PMID:20406177</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/10386051','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/10386051"><span id="translatedtitle">[<span class="hlt">Al</span>-Biruni--a universal scientist].</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kujundzić, E; Masić, I</p> <p>1999-01-01</p> <p><span class="hlt">Al</span>-Biruni's was of Persian descent. He was born in Horesmiya and had studied mathematics, history and medicine. Acquiring knowledge from these sciences, he wrote an outstanding work on chronology of several nations and devoted it to Ziyarit ruler Kabus. He made a chronological overview of calendars from many nations, including Persians, Greeks, Egyptians, Jews, Melkitian and Nestorian Christians, Sabeyaans as well as the old Arabs. Data presented in the work, according to the later authors, were taken from very reliable sources. He was contemporary of Ibn-Sina, and thanks to their friendship, they have discussed very much miscellaneous topics. He belonged to the group of scholars, taken by Gaznevian Soultan Mahmud to a long journey to India. Afterwards <span class="hlt">Al</span>-Biruni wrote and published detailed work "Description of India"--a work on cultural history of India. Due to excellent abilities of <span class="hlt">Al</span>-Biruni as a philosopher and scholar, there are still significant and reliable notes about buddhistic philosophy, structure of castes and Brahmans' life style. In this <span class="hlt">Al</span>-Biruni's masterpiece, there are many comparative analysis of Suffism and certain Indian philosophical methods. <span class="hlt">Al</span>-Biruni's most important work is "Pharmacopoeia"--"Kitab <span class="hlt">al</span>-saydala", which brilliantly describes all medicaments. This work has been published in many languages. He also wrote few works on astronomy and astrology. In those works he has explained some astrological events through scientific approach in a such peculiar way that nobody has ever explained before. He was also interested in sciences like geology, mineralology, geography, mathematics, psychology and many others. PMID:10386051</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011mave.book..105G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011mave.book..105G"><span id="translatedtitle">Mathematik <span class="hlt">als</span> Geisteswissenschaft Der Mathematikschädigung dialogisch vorbeugen</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gallin, Peter</p> <p></p> <p>Ursprünglich wollte ich Architekt werden getreu den Vorbildern von Vater und Großvater. Darum zeichnete ich bereits <span class="hlt">als</span> neunjähriges Kind Pläne von Häusern in der Art, wie ich sie oft zu sehen bekam. Ein ausgemustertes Holzdreieck mit einem rechten und zwei halben rechten Winkeln war das einzige Konstruktionswerkzeug, das ich damals besaß und mit dem ich mich ans Werk machte. Zuerst einmal war da natürlich ein Rechteck <span class="hlt">als</span> Grundriss des Hauses zu zeichnen: Eine Seite, ein rechter Winkel, die zweite Seite, wieder ein rechterWinkel, die dritte Seite in gleicher Länge wie die erste und dann der dritte rechte Winkel, dessen letzter Schenkel die vierte Seite gab.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19850044007&hterms=ductility&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dductility','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19850044007&hterms=ductility&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dductility"><span id="translatedtitle">Ductility in rapidly solidified Ni<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Gaydosh, D. J.; Jech, R. W.; Titran, R. H.</p> <p>1985-01-01</p> <p>An attempt is made to refine the grain structure of equiatomic Ni<span class="hlt">Al</span> by means of rapid solidification processing, and to examine the effect of small grain size on room temperature ductility. Free melt spinning was used to produce the rapidly solidified material. Room temperature bend testing of both as-spun and heat-treated Ni<span class="hlt">Al</span> ribbon was conducted by free bending the ribbon around a mandrel of successively smaller diameter until failure occurred. Room-temperature plastic deformation was exhibited both before and after a 1-h heat treatment at 1000 C. Heat treatment increased the observed ductility.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_9 --> <div id="page_10" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="181"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4712627','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4712627"><span id="translatedtitle">Complementary and Alternative Therapies in <span class="hlt">ALS</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Bedlack, Richard S.; Joyce, Nanette; Carter, Gregory T.; Pagononi, Sabrina; Karam, Chafic</p> <p>2015-01-01</p> <p>Synopsis Given the severity of their illness and lack of effective disease modifying agents, it is not surprising that most patients with <span class="hlt">ALS</span> consider trying complementary and alternative therapies. Some of the most commonly considered alternative therapies include special diets, nutritional supplements, cannabis, acupuncture, chelation and energy healing. This chapter reviews these in detail. We also describe 3 models by which physicians may frame discussions about alternative therapies: paternalism, autonomy and shared decision making. Finally, we review a program called ALSUntangled which using shared shared decision making to review alternative therapies for <span class="hlt">ALS</span>. PMID:26515629</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19980028484','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19980028484"><span id="translatedtitle">Directional Solidification and Mechanical Properties of Ni<span class="hlt">Al-NiAl</span>Ta Alloys</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Johnson, D. R.; Chen, X. F.; Oliver, B. F.; Noebe, R. D.; Whittenberger, J. D.</p> <p>1995-01-01</p> <p>Directional solidification of eutectic alloys is a promising technique for producing in-situ composite materials exhibiting a balance of properties. Consequently, the microstructure, creep strength and fracture toughness of directionally solidified Ni<span class="hlt">Al-NiAl</span>Ta alloys were investigated. Directional solidification was performed by containerless processing techniques to minimize alloy contamination. The eutectic composition was found to be Ni<span class="hlt">Al</span>-15.5 at% Ta and well-aligned microstructures were produced at this composition. A near-eutectic alloy of Ni<span class="hlt">Al</span>-14.5Ta was also investigated. Directional solidification of the near-eutectic composition resulted in microstructures consisting of Ni<span class="hlt">Al</span> dendrites surrounded by aligned eutectic regions. The off-eutectic alloy exhibited promising compressive creep strengths compared to other Ni<span class="hlt">Al</span>-based intermetallics, while preliminary testing indicated that the eutectic alloy was competitive with Ni-base single crystal superalloys. The room temperature toughness of these two-phase alloys was similar to that of polycrystalline Ni<span class="hlt">Al</span> even with the presence of the brittle Laves phase Ni<span class="hlt">Al</span>Ta.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Replication&pg=4&id=EJ821622','ERIC'); return false;" href="http://eric.ed.gov/?q=Replication&pg=4&id=EJ821622"><span id="translatedtitle">Replication and Extension of Little et <span class="hlt">al.'s</span> (2003) Forms and Functions of Aggression Measure</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Fite, Paula J.; Stauffacher, Kirstin; Ostrov, Jamie M.; Colder, Craig R.</p> <p>2008-01-01</p> <p>The goal of the current study was to replicate the confirmatory factor analysis of Little et <span class="hlt">al.'s</span> (2003) aggression measure in an American sample of 69 children (mean age = 12.93 years; SD = 1.27). Although an exact replication of the original model could not be estimated given the small sample, a modified model representing a conceptual…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JOM....66i1785S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JOM....66i1785S"><span id="translatedtitle">Melting, Processing, and Properties of Disordered Fe-<span class="hlt">Al</span> and Fe-<span class="hlt">Al</span>-C Based Alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Satya Prasad, V. V.; Khaple, Shivkumar; Baligidad, R. G.</p> <p>2014-09-01</p> <p>This article presents a part of the research work conducted in our laboratory to develop lightweight steels based on Fe-<span class="hlt">Al</span> alloys containing 7 wt.% and 9 wt.% aluminum for construction of advanced lightweight ground transportation systems, such as automotive vehicles and heavy-haul truck, and for civil engineering construction, such as bridges, tunnels, and buildings. The melting and casting of sound, porosity-free ingots of Fe-<span class="hlt">Al</span>-based alloys was accomplished by a newly developed cost-effective technique. The technique consists of using a special flux cover and proprietary charging schedule during air induction melting. These alloys were also produced using a vacuum induction melting (VIM) process for comparison purposes. The effect of aluminum (7 wt.% and 9 wt.%) on melting, processing, and properties of disordered solid solution Fe-<span class="hlt">Al</span> alloys has been studied in detail. Fe-7 wt.% <span class="hlt">Al</span> alloy could be produced using air induction melting with a flux cover with the properties comparable to the alloy produced through the VIM route. This material could be further processed through hot and cold working to produce sheets and thin foils. The cold-rolled and annealed sheet exhibited excellent room-temperature ductility. The role of carbon in Fe-7 wt.% <span class="hlt">Al</span> alloys has also been examined. The results indicate that Fe-<span class="hlt">Al</span> and Fe-<span class="hlt">Al</span>-C alloys containing about 7 wt.% <span class="hlt">Al</span> are potential lightweight steels.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/872577','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/872577"><span id="translatedtitle">Electronic circuits having Ni<span class="hlt">Al</span> and Ni.sub.3 <span class="hlt">Al</span> substrates</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Deevi, Seetharama C.; Sikka, Vinod K.</p> <p>1999-01-01</p> <p>An electronic circuit component having improved mechanical properties and thermal conductivity comprises Ni<span class="hlt">Al</span> and/or Ni.sub.3 <span class="hlt">Al</span>, upon which an alumina layer is formed prior to applying the conductive elements. Additional layers of copper-aluminum alloy or copper further improve mechanical strength and thermal conductivity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009MMTA...40.1541Q','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009MMTA...40.1541Q"><span id="translatedtitle">Combustion Synthesis Reactions in Cold-Rolled Ni/<span class="hlt">Al</span> and Ti/<span class="hlt">Al</span> Multilayers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Qiu, Xiaotun; Liu, Ranran; Guo, Shengmin; Graeter, Jesse Harris; Kecskes, Laszlo; Wang, Jiaping</p> <p>2009-07-01</p> <p>In this article, a cold rolling method was developed to fabricate Ni/<span class="hlt">Al</span> and Ti/<span class="hlt">Al</span> multilayer foils, and the combustion synthesis reactions in the cold-rolled foils were investigated. Combustion synthesis reactions were initiated by heating one end of the cold-rolled foil in a flame for several seconds. The Ni/<span class="hlt">Al</span> foils went through three reaction stages. The first reaction stage was a displacement of reaction zone with <span class="hlt">Al</span>3Ni as the reaction product. During the second stage, the part of the foil in the flame underwent thermal explosion. In the last stage, the heat released by thermal explosion triggered a self-propagating high-temperature synthesis (SHS) reaction across the foil that resulted in the formation of <span class="hlt">Al</span>Ni. In contrast, the Ti/<span class="hlt">Al</span> foils experienced only two reaction stages. First, a displacement of the reaction zone propagated across the foil with formation of <span class="hlt">Al</span>3Ti at the Ti/<span class="hlt">Al</span> interface. Then a thermal explosion reaction occurred in the part of foil that was heated in the flame, resulting in many different phases in the reacted foil.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009SPIE.7518E..13M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009SPIE.7518E..13M"><span id="translatedtitle">The evaluation and measurement of <span class="hlt">Al</span>GaN epitaxial layer with high <span class="hlt">Al</span> mole fraction</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Meng, Zhao; Yu, Libo; Li, Xiao; Liu, Qibin; Duan, Huiqiang; Yu, Chenhui; Chen, Changqing</p> <p>2009-08-01</p> <p>The epitaxial layer quality of AlxGa1-xN (x>0.6) on sapphire substrate grown by metal organic chemical vapor deposition (MOCVD) needs to be further improved. In this paper, we evaluated the properties of defects, lattice mismatch between epitaxial layer and substrate, crystal quality and conductivity for these high <span class="hlt">Al</span> mole fraction materials from the viewpoint of fabricating high performance solar blind detectors by comprehensive utilizing various undamaged measurements. The measurement of transmission spectrum was used to evaluate the absorption edge, band gap, mole fraction of <span class="hlt">Al</span> content, hetero-epitaxial interface, and transmissivity in the ultraviolet spectral range. X-ray diffraction (XRD) was used to measure the component of the <span class="hlt">Al</span>GaN material, uniformity of the material and crystal quality. The conductivity of the surface layer of the <span class="hlt">Al</span>GaN film material was obtained by using high precision current-voltage curve measurement. In short, the material quality, optical and electrical properties, and uniformity for high <span class="hlt">Al</span> mole fraction <span class="hlt">Al</span>GaN epitaxial layers were qualitatively or quantitatively measured and analyzed. These works lay the foundation for manufacturing high performance solar blind ultraviolet detectors based on high <span class="hlt">Al</span> mole fraction <span class="hlt">Al</span>GaN epitaxial materials on sapphire substrate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22150063','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22150063"><span id="translatedtitle">Synthesis of nanostructured <span class="hlt">Al</span>N by solid state reaction of <span class="hlt">Al</span> and diaminomaleonitrile</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rounaghi, S.A.; Eshghi, H.; Kiani Rashid, A.R.; Vahdati Khaki, J.; Samadi Khoshkhoo, M.; Scudino, S.; Eckert, J.; TU Dresden, Institut fuer Werkstoffwissenschaft, Dresden D-01062 </p> <p>2013-02-15</p> <p>The solid state reaction of diaminomaleonitrile (DAMN) with aluminum via both mechanochemical and thermal treatment routes was studied by X-ray diffraction and Fourier transform infrared spectroscopy. During the milling process, the reaction starts with the deammoniation of the DAMN molecules, followed by the formation of nanostructured <span class="hlt">Al</span>N powder as the main solid product after milling for 7 h. The reactivity of the mixed powder was also investigated during the conventional thermal treatment process using differential scanning calorimetry, derivative thermogravimetry and thermogravimetric analysis. The results reveal that DAMN starts to polymerize at 192 Degree-Sign C by the elimination of the amine groups. Furthermore, increasing the annealing temperature leads to the formation of a nitrogen-containing carbonaceous material with the structure similar to non-crystalline carbon. However, no evidence for the formation of <span class="hlt">Al</span>N was observed in the annealed samples even at temperatures as high as the <span class="hlt">Al</span> melting point. - Graphical abstract: <span class="hlt">Al</span>N nanoparticles obtained after milling of <span class="hlt">Al</span> and diaminomaleonitrile (DAMN) for 12 h. Highlights: Black-Right-Pointing-Pointer Solid state reaction of diaminomaleonitrile (DAMN) with <span class="hlt">Al</span> was studied via mechanochemical and thermal treatment routs. Black-Right-Pointing-Pointer Nanocrystalline <span class="hlt">Al</span>N was successfully synthesized by the mechanochemical process. Black-Right-Pointing-Pointer The C/N material was formed by polymerization of DAMN during the thermal treatment process. Black-Right-Pointing-Pointer No reaction between DAMN and <span class="hlt">Al</span> was detected during the thermal treatment method.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6137079','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6137079"><span id="translatedtitle">Stress-strain behavior of fine-grained <span class="hlt">Al/Al</span>[sub 3]Ti alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Wang, S.H.; Kao, P.W.; Chang, C.P. )</p> <p>1993-08-01</p> <p>It has been recognized that dispersion strengthening with hard, stable, high melting point phases offers an effective technique for improving the stiffness of aluminum alloys over a wider temperature range compared to precipitation strengthening. Recent research indicates that mechanically alloyed (MA) <span class="hlt">Al</span>-Ti alloys have good ambient and elevated temperature properties. The MA <span class="hlt">Al</span>-Ti alloys are characterized by the presence of large volume fractions of submicron sized <span class="hlt">Al</span>[sub 3]Ti dispersoids within a fine grain aluminum matrix. In addition, such alloys contain a significant amount of ultrafine <span class="hlt">Al</span>[sub 4]C[sub 3] and <span class="hlt">Al</span>[sub 2]O[sub 3] dispersoids incorporated during the MA process. The carbide and oxide dispersoids reside mainly along grain boundaries and can stabilize a fine-grain structure even after long term exposure at elevated temperature. The high temperature strength of these MA aluminum alloys is strongly controlled by carbide and oxide dispersoids. The Young's modulus of <span class="hlt">Al</span>[sub 3]Ti phase was determined to be about 220 GPa. Hence, the presence of the <span class="hlt">Al</span>[sub 3]Ti phase is very effective in increasing the stiffness of the MA aluminum alloys is strongly controlled by carbide and oxide dispersoids. The Young's modulus of <span class="hlt">Al</span>[sub 3]Ti phase was determined to be about 220 GPa. Hence, the presence of the <span class="hlt">Al</span>[sub 3]Ti phase is very effective in increasing the stiffness of the MA aluminum alloys. The strength of such alloys increases with increasing <span class="hlt">Al</span>[sub 3]Ti content; however, the strengthening effect of <span class="hlt">Al</span>[sub 3]Ti dispersoids diminishes at temperatures above about 400C. On the other hand, such dispersoids also appear responsible for improving the high temperature ductility of the MA <span class="hlt">Al</span>-Ti alloys. A better understanding of the strengthening mechanisms is desirable. This paper presents the room temperature stress-strain behavior of two <span class="hlt">Al-Al</span>[sub 3]Ti alloys made by mechanical alloying and hot-pressing.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19980210984','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19980210984"><span id="translatedtitle">CVD Fiber Coatings for <span class="hlt">Al</span>2O3/Ni<span class="hlt">Al</span> Composites</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Boss, Daniel E.</p> <p>1995-01-01</p> <p>While sapphire-fiber-reinforced nickel aluminide (<span class="hlt">Al</span>2O3/Ni<span class="hlt">Al</span>) composites are an attractive candidate for high-temperature structures, the significant difference in the coefficient of thermal expansion between the Ni<span class="hlt">Al</span> matrix and the sapphire fiber creates substantial residual stresses in the composite. This study seeks to produce two fiber-coating systems with the potential to reduce the residual stresses in the sapphire/Ni<span class="hlt">Al</span> composite system. Chemical vapor deposition (CVD) was used to produce both the compensating and compliant-fiber coatings for use in sapphire/Ni<span class="hlt">Al</span> composites. A special reactor was designed and built to produce the FGM and to handle the toxic nickel precursors. This process was successfully used to produce 500-foot lengths of fiber with coating thicknesses of approximately 3 microns, 5 microns, and 10 microns.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010ApPhL..97m3104S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010ApPhL..97m3104S"><span id="translatedtitle">In situ microscopy of rapidly heated nano-<span class="hlt">Al</span> and nano-<span class="hlt">Al</span>/WO3 thermites</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sullivan, Kyle T.; Chiou, Wen-An; Fiore, Richard; Zachariah, Michael R.</p> <p>2010-09-01</p> <p>The initiation and reaction mechanism of nano-<span class="hlt">Al</span> and nano-<span class="hlt">Al</span> thermites in rapid heating environments is investigated in this work. A semiconductor-based grid/stage was used, capable of in situ heating of a sample from room temperature to 1473 K, and at a rate of 106 K/s, inside an electron microscope. Nano-<span class="hlt">Al</span> was rapidly heated in a transmission electron microscope, and before and after images indicate that the aluminum migrates through the shell, consistent with a diffusion-based mechanism. A nano-<span class="hlt">Al</span>/WO3 composite was then heated in a scanning electron microscope. The results indicate that a reactive sintering mechanism is occurring for the nano-<span class="hlt">Al</span>/WO3 thermite, as the products are found to be in surface contact and significantly deformed after the heating pulse.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19910034051&hterms=stuttgart&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3Dstuttgart','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19910034051&hterms=stuttgart&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3Dstuttgart"><span id="translatedtitle">1300 K compressive properties of a reaction milled Ni<span class="hlt">Al-Al</span>N composites</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Whittenberger, J. Daniel; Arzt, Eduard; Luton, Michael J.</p> <p>1990-01-01</p> <p>When B2 crystal-structure nickel aluminide is subjected to high-intensity mechanical ball milling in a liquid nitrogen bath, or 'cryomilling', an Ni<span class="hlt">Al</span> composite is obtained which contains about 10 vol pct <span class="hlt">Al</span>N particles. This composition arises from the incorporation of N during cryomilling; during subsequent thermomechanical processing, the N reacts with <span class="hlt">Al</span>. While compressive testing of extruded or isostatically pressed specimens at 1300 K indicated that strength at relatively fast strain rates is slightly dependent on consolidation method, slower strain rates indicate no clear dependency on densification technique: four different consolidation methods were found to yield similar creep strengths. The creep properties of Ni<span class="hlt">Al-Al</span>N are similar to those of the single-crystal Ni-base superalloy NASAIR 100.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/5188197','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/5188197"><span id="translatedtitle"><span class="hlt">Al</span>/sub 2/O/sub 3/ adherence on CoCr<span class="hlt">Al</span> alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kingsley, L.M.</p> <p>1980-04-01</p> <p>Adherence of protective oxides on NiCr<span class="hlt">Al</span> and CoCr<span class="hlt">Al</span> superalloys has been promoted by a dispersion of a highly oxygen reactive element or its oxide being produced within the protection system. Two aspects of this subject are investigated here: the use of <span class="hlt">Al</span>/sub 2/O/sub 3/ as both the dispersion and protective oxide; and the production of an HfO/sub 2/ dispersion while simultaneously aluminizing the alloy. It was found that an <span class="hlt">Al</span>/sub 2/O/sub 3/ dispersion will act to promote the adherence of an external scale of <span class="hlt">Al</span>/sub 2/O/sub 3/ to a degree comparable to previously tested dispersions and an HfO/sub 2/ dispersion comparable to that produced by a Rhines pack treatment is produced during aluminization.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6118818','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6118818"><span id="translatedtitle">Calculation of the optical spectra of. beta. prime -Ni<span class="hlt">Al</span> and Co<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kim, K.J.; Harmon, B.N.; Lynch, D.W. )</p> <p>1991-01-15</p> <p>Band structures of {beta}{prime}-Ni<span class="hlt">Al</span> and Co<span class="hlt">Al</span> have been calculated to interpret the experimental optical spectra. The optical transitions of both compounds are calculated as direct interband transitions including electric-dipole matrix elements between the eigenstates of the ground state of the system. All of the structures found in the optical spectra of both compounds involve states with some Ni or Co {ital d} character in both the initial and the final states. The overall agreement is good between the calculated spectrum and the optical data for {beta}{prime}-Ni<span class="hlt">Al</span>. For {beta}{prime}-Co<span class="hlt">Al</span> there is qualitative agreement but some discrepancy for the energy positions and the intensities of the structures. A self-energy correction for the excitation spectrum has been used for {beta}{prime}-Co<span class="hlt">Al</span> to improve the agreement.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011MS%26E...23a2040D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011MS%26E...23a2040D"><span id="translatedtitle">An impedance study of complex <span class="hlt">Al/Cu-Al</span>2O3 electrode</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Denisova, J.; Katkevics, J.; Erts, D.; Viksna, A.</p> <p>2011-06-01</p> <p>Electrochemical impedance spectroscopy (EIS) was used to investigate different Cu deposition regimes on <span class="hlt">Al</span> surface obtained by internal electrolysis and to characterize properties of fabricated electrodes. EIS experimental data confirmed that Cu deposition by internal electrolysis is realized and the complex electrode system is obtained. The main difficulty in preparation of <span class="hlt">Al</span>/Cu electrodes is to prevent aluminium oxidation before and during electrochemical deposition of Cu particles. In this work NaCl, CH3COONa, K2SO4, mono- and diammonium citrate electrolytes were examined to determine their suitability for impedance measurements. <span class="hlt">Al/Cu-Al</span>2O3 electrode composition was approved by equivalent circuit analysis, optical and scanning electron microscope methods. The most optimal Cu deposition mode using internal electrolysis was determined. The obtained results are promising for future electrochemical fabrication of nanostructures directly on <span class="hlt">Al</span> surfaces by internal electrolysis.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MS%26E...75a2034P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MS%26E...75a2034P"><span id="translatedtitle">Wear characteristics of <span class="hlt">Al-Al</span>N composites produced in-situ by nitrogenation</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Pradhan, S.; Jena, S. K.; Patnaik, S. C.; Swain, P. K.; Majhi, J.</p> <p>2015-02-01</p> <p>In the present scenario most of the parts used in automobile and aerospace industries are made of composites. Aluminium metal has a very high strength to weight ratio. <span class="hlt">Al-Al</span>N metal matrix composites have excellent mechanical properties like good wear resistance, high hardness and high strength to weight ratio which are obtained from low density of aluminium and high hardness and wear resistance of <span class="hlt">Al</span>N. Therefore, use of <span class="hlt">Al-Al</span>N MMC leads to advantages in automobile industries as it reduces fuel consumption and gives better structural strength. The composites can be produced ex-situ by introducing <span class="hlt">Al</span>N as reinforcement into the metal matrix and in- situ by nitrogenation process. In the present process <span class="hlt">Al-Al</span>N composites were fabricated by treating molten aluminium with a mixture of CaO and NH4Cl and held at temperature range at 750-930°C and then cast into a metal mould. Addition of CaO to NH4Cl is found to have a more pronounced effect as a nitrogenation agent in comparison with NH4Cl in the molten aluminium in the temperature range of 700- 1000°C. Castings of aluminium and <span class="hlt">Al-Al</span>N composites were prepared by mixing different ratios of aluminium and NH4Cl, at different casting temperatures and holding time. Wear resistance and hardness of the samples were determined, and microstructure studies were carried out. The composite formed using higher amount of NH4Cl had higher hardness and wear resistance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JaJAP..49c5701H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JaJAP..49c5701H"><span id="translatedtitle">Effects of the <span class="hlt">Al</span>N Interlayer on the Distribution and Mobility of Two-Dimensional Electron Gas in <span class="hlt">AlGaN/Al</span>N/GaN Heterojunctions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hu, Weiguo; Ma, Bei; Li, Dabing; Miyagawa, Reina; Miyake, Hideto; Hiramatsu, Kazumasa</p> <p>2010-03-01</p> <p><span class="hlt">Al</span>0.25Ga0.75N/<span class="hlt">Al</span>N/GaN heterojunctions with <span class="hlt">Al</span>N interlayers of various thicknesses were grown on c-plane sapphire by metalorganic vapor phase epitaxy (MOVPE). We have revealed that the <span class="hlt">Al</span>N interlayer hardly affects morphologies and crystal qualities; however, it prominently enhances the two-dimensional electron gas (2DEG) mobility. The optimum thickness of the <span class="hlt">Al</span>N interlayer is 1 nm, and the corresponding room temperature Hall mobility and the sheet carrier density are 1700 cm2 V-1 s-1 and 1.27 ×1013 cm-2, respectively. Self-consistent calculation results indicates that with increasing <span class="hlt">Al</span>N thickness, i) the conduction-band discontinuity between <span class="hlt">Al</span>GaN and GaN linearly increases; ii) the percentage of the total carriers in the <span class="hlt">Al</span>GaN layer exponentially decreases, and content in the <span class="hlt">Al</span>N layer exponentially increases.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JaJAP..49c5701W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JaJAP..49c5701W"><span id="translatedtitle">Effects of the <span class="hlt">Al</span>N Interlayer on the Distribution and Mobility of Two-Dimensional Electron Gas in <span class="hlt">AlGaN/Al</span>N/GaN Heterojunctions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Weiguo Hu,; Bei Ma,; Dabing Li,; Reina Miyagawa,; Hideto Miyake,; Kazumasa Hiramatsu,</p> <p>2010-03-01</p> <p><span class="hlt">Al</span>0.25Ga0.75N/<span class="hlt">Al</span>N/GaN heterojunctions with <span class="hlt">Al</span>N interlayers of various thicknesses were grown on c-plane sapphire by metalorganic vapor phase epitaxy (MOVPE). We have revealed that the <span class="hlt">Al</span>N interlayer hardly affects morphologies and crystal qualities; however, it prominently enhances the two-dimensional electron gas (2DEG) mobility. The optimum thickness of the <span class="hlt">Al</span>N interlayer is 1 nm, and the corresponding room temperature Hall mobility and the sheet carrier density are 1700 cm2 V-1 s-1 and 1.27 × 1013 cm-2, respectively. Self-consistent calculation results indicates that with increasing <span class="hlt">Al</span>N thickness, i) the conduction-band discontinuity between <span class="hlt">Al</span>GaN and GaN linearly increases; ii) the percentage of the total carriers in the <span class="hlt">Al</span>GaN layer exponentially decreases, and content in the <span class="hlt">Al</span>N layer exponentially increases.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080047352','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080047352"><span id="translatedtitle">Formation of gamma(sup prime)-Ni3<span class="hlt">Al</span> via the Peritectoid Reaction: gamma + beta (+ <span class="hlt">Al</span>2O3)=gamma(sup prime)(+ <span class="hlt">Al</span>2O3)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Copeland, Evan</p> <p>2008-01-01</p> <p>The activities of <span class="hlt">Al</span> and Ni were measured using multi-cell Knudsen effusion-cell mass spectrometry (multi-cell KEMS), over the composition range 8-32 at.%<span class="hlt">Al</span> and temperature range T=1400-1750 K in the Ni-<span class="hlt">Al</span>-O system. These measurements establish that equilibrium solidification of gamma(sup prime)-Ni3<span class="hlt">Al</span>-containing alloys occurs by the eutectic reaction, L (+ <span class="hlt">Al</span>2O3)=gamma + Beta(+ <span class="hlt">Al</span>2O3), at 1640 +/- 1 K and a liquid composition of 24.8 +/- 0.2 at.%<span class="hlt">al</span> (at an unknown oxygen content). The {gamma + Beta (+<span class="hlt">Al</span>2O3} phase field is stable over the temperature range 1633-1640 K, and gamma(sup prime)-Ni3<span class="hlt">Al</span> forms via the peritectoid, gamma + Beta (+ <span class="hlt">Al</span>2O3)=gamma(sup prime) (+ <span class="hlt">Al</span>2O3), at 1633 +/- 1 K. This behavior is consistent with the current Ni-<span class="hlt">Al</span> phase diagram and a new diagram is proposed. This new Ni-<span class="hlt">Al</span> phase diagram explains a number of unusual steady-state solidification structures reported previously and provides a much simpler reaction scheme in the vicinity of the gamma(sup prime)-Ni2<span class="hlt">Al</span> phase field.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20100042390','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20100042390"><span id="translatedtitle">Formation of gamma'-Ni3<span class="hlt">Al</span> via the Peritectoid Reaction: gamma plus beta (+<span class="hlt">Al</span>2O3) equals gamma'(+<span class="hlt">Al</span>2O3)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Copland, Evan</p> <p>2008-01-01</p> <p>The activities of <span class="hlt">Al</span> and Ni were measured using multi-cell Knudsen effusion-cell mass spectrometry (multi-cell KEMS), over the composition range 8 - 32 at.%<span class="hlt">Al</span> and temperature range T = 1400 - 1750 K in the Ni-<span class="hlt">Al</span>-O system. These measurements establish that equilibrium solidification of gamma'-Ni3<span class="hlt">Al</span>-containing alloys occurs by the eutectic reaction, L (+ <span class="hlt">Al</span>2O3) = gamma + beta (+ <span class="hlt">Al</span>2O3), at 1640 plus or minus 1 K and a liquid composition of 24.8 plus or minus 0.2 at.%<span class="hlt">Al</span> (at an unknown oxygen content). The {gamma + beta + <span class="hlt">Al</span>2O3} phase field is stable over the temperature range 1633 - 1640 K, and gamma'-Ni3<span class="hlt">Al</span> forms via the peritectiod, gamma + beta (+ <span class="hlt">Al</span>2O3) = gamma'(+ <span class="hlt">Al</span>2O3), at 1633 plus or minus 1 K. This behavior is inconsistent with the current Ni-<span class="hlt">Al</span> phase diagram and a new diagram is proposed. This new Ni-<span class="hlt">Al</span> phase diagram explains a number of unusual steady state solidification structures reported previously and provides a much simpler reaction scheme in the vicinity of the gamma'-Ni3<span class="hlt">Al</span> phase field.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_10 --> <div id="page_11" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="201"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/87741','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/87741"><span id="translatedtitle">Ternary Dy-Er-<span class="hlt">Al</span> magnetic refrigerants</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Gschneidner, K.A. Jr.; Takeya, Hiroyuki</p> <p>1995-07-25</p> <p>A ternary magnetic refrigerant material comprising (Dy{sub 1{minus}x}Er{sub x})<span class="hlt">Al</span>{sub 2} for a magnetic refrigerator using the Joule-Brayton thermodynamic cycle spanning a temperature range from about 60K to about 10K, which can be adjusted by changing the Dy to Er ratio of the refrigerant. 29 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/869994','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/869994"><span id="translatedtitle">Ternary Dy-Er-<span class="hlt">Al</span> magnetic refrigerants</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Gschneidner, Jr., Karl A. (Ames, IA); Takeya, Hiroyuki (Ibaraki, JP)</p> <p>1995-07-25</p> <p>A ternary magnetic refrigerant material comprising (Dy.sub.1-x Er.sub.x)<span class="hlt">Al</span>.sub.2 for a magnetic refrigerator using the Joule-Brayton thermodynamic cycle spanning a temperature range from about 60K to about 10K, which can be adjusted by changing the Dy to Er ratio of the refrigerant.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/791807','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/791807"><span id="translatedtitle">Joint SSRTNet/<span class="hlt">ALS</span>-MES Workshop report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Shuh, David; Van Hove, Michel</p> <p>2001-11-30</p> <p>This joint workshop brought together experimentalists and theorists interested in synchrotron radiation and highlighted subjects relevant to molecular environmental science (MES). The strong mutual interest between the participants resulted in joint sessions on the first day, followed by more specialized parallel sessions on the second day. Held in conjunction with the Advanced Light Source (<span class="hlt">ALS</span>) Users' Association Annual Meeting at the Lawrence Berkeley National Laboratory (Berkeley Lab), the Synchrotron Radiation Research Theory Network (SRRTNet) workshop was co-organized by Michel Van Hove (Berkeley Lab and University of California, Davis) and Andrew Canning (Berkeley Lab), while David Shuh (Berkeley Lab) organized the <span class="hlt">ALS</span>-MES workshop. SRRTNet is a global network that promotes the interaction of theory and experiment (http://www.cse.clrc.ac.uk/Activity/SRRTnet). The <span class="hlt">ALS</span>-MES project is constructing Beamline 11.0.2.1-2, a new soft x-ray beamline for MES investigations at photon energies from 75 eV to 2 keV, to provide photons for wet spectroscopy end stations and an upgraded scanning transmission x-ray microscope (STXM). The <span class="hlt">ALS</span>-MES beamline and end stations will be available for users in the late fall of 2002.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23856645','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23856645"><span id="translatedtitle">Sirtuins as therapeutic targets of <span class="hlt">ALS</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Pasinetti, Giulio Maria; Bilski, Amanda E; Zhao, Wei</p> <p>2013-09-01</p> <p>Sirtuins have received a lot of attention in biological functions associated with metabolism, survival development, and most recently, neurodegeneration. The versatile role of sirtuins can be readily redirected for drug discovery studies for novel treatment in amyotrophic lateral sclerosis (<span class="hlt">ALS</span>), as presented in this highlight, by sirtuin-mediated ketogenic responses influencing mitochondrial function. PMID:23856645</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2010-01-25/pdf/2010-1338.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2010-01-25/pdf/2010-1338.pdf"><span id="translatedtitle">75 FR 3895 - Yale University, et <span class="hlt">al</span>.;</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2010-01-25</p> <p>... notice at 74 FR 67851, December 21, 2009. Docket Number: 09-065. Applicant: U.S. Department of Homeland..., Quanta 200 FEG. Manufacturer: FEI Company, Czech Republic. Intended Use: See notice at 74 FR 67851... International Trade Administration Yale University, et <span class="hlt">al</span>.; Notice of Consolidated Decision on Applications...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2013-01-23/pdf/2013-01210.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2013-01-23/pdf/2013-01210.pdf"><span id="translatedtitle">78 FR 4967 - Alabama Disaster #<span class="hlt">AL</span>-00046</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2013-01-23</p> <p>... ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00046 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a notice of an Administrative declaration of a disaster for the State of ALABAMA dated 01/10... INFORMATION CONTACT: A. Escobar, Office of Disaster Assistance, U.S. Small Business Administration, 409...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Psychoactive+AND+drugs&pg=4&id=EJ492979','ERIC'); return false;" href="http://eric.ed.gov/?q=Psychoactive+AND+drugs&pg=4&id=EJ492979"><span id="translatedtitle">Synopsis of "Reply to Levitas et <span class="hlt">al</span>."</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>O'Brien, John</p> <p>1994-01-01</p> <p>This synopsis of a reply by Wolf Wolfensberger to a critique by Levitas et <span class="hlt">al</span>. (EC 609 743) notes extensive documentation supporting Wolfensberger's assertion that prescription psychoactive drugs are health destroying and life destroying. Issues of truth and of epistemology are identified as they apply to the treatment of these socially devalued…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19720000526','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19720000526"><span id="translatedtitle"><span class="hlt">Al</span>/Cl2 molten salt battery</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Giner, J.</p> <p>1972-01-01</p> <p>Molten salt battery has been developed with theoretical energy density of 5.2 j/kg (650 W-h/lb). Battery, which operates at 150 C, can be used in primary mode or as rechargeable battery. Battery has aluminum anode and chlorine cathode. Electrolyte is mixture of <span class="hlt">Al</span>Cl3, NaCl, and some alkali metal halide such as KCl.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=lips&pg=2&id=EJ869605','ERIC'); return false;" href="http://eric.ed.gov/?q=lips&pg=2&id=EJ869605"><span id="translatedtitle">Kinematics of Disease Progression in Bulbar <span class="hlt">ALS</span></span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Yunusova, Yana; Green, Jordan R.; Lindstrom, Mary J.; Ball, Laura J.; Pattee, Gary L.; Zinman, Lorne</p> <p>2010-01-01</p> <p>The goal of this study was to investigate the deterioration of lip and jaw movements during speech longitudinally in three individuals diagnosed with bulbar amyotrophic lateral sclerosis (<span class="hlt">ALS</span>). The study was motivated by the need to understand the relationship between physiologic changes in speech movements and clinical measures of speech…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=pattern+AND+recognition+AND+letters+AND+pattern+AND+recognition+AND+letters&pg=5&id=EJ734728','ERIC'); return false;" href="http://eric.ed.gov/?q=pattern+AND+recognition+AND+letters+AND+pattern+AND+recognition+AND+letters&pg=5&id=EJ734728"><span id="translatedtitle">Correction to Rothermund et <span class="hlt">al</span>. (2005)</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Rothermund, Klaus; Wentura, Dirk; De Houwer, Jan</p> <p>2005-01-01</p> <p>This article reports an error in the article "Retrieval of Incidental Stimulus-Response Associations as a Source of Negative Priming" by Rothermund et <span class="hlt">al</span>. ("Journal of Experimental Psychology: Learning, Memory, and Cognition," Vol 31(3) May 2005, 482-495). Table 1 (p. 484) was incorrectly typeset. The correct layout is provided. (The following…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2011-10-07/pdf/2011-25927.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2011-10-07/pdf/2011-25927.pdf"><span id="translatedtitle">76 FR 62481 - Incapital LLC, et <span class="hlt">al</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2011-10-07</p> <p>... From the Federal Register Online via the Government Publishing Office SECURITIES AND EXCHANGE COMMISSION Incapital LLC, et <span class="hlt">al</span>.; Notice of Application September 30, 2011. AGENCY: Securities and Exchange Commission (``Commission''). ACTION: Notice of application for an order under section 12(d)(1)(J) of...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=Green+AND+movement&pg=5&id=EJ869605','ERIC'); return false;" href="http://eric.ed.gov/?q=Green+AND+movement&pg=5&id=EJ869605"><span id="translatedtitle">Kinematics of Disease Progression in Bulbar <span class="hlt">ALS</span></span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Yunusova, Yana; Green, Jordan R.; Lindstrom, Mary J.; Ball, Laura J.; Pattee, Gary L.; Zinman, Lorne</p> <p>2010-01-01</p> <p>The goal of this study was to investigate the deterioration of lip and jaw movements during speech longitudinally in three individuals diagnosed with bulbar amyotrophic lateral sclerosis (<span class="hlt">ALS</span>). The study was motivated by the need to understand the relationship between physiologic changes in speech movements and clinical measures of speech…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED542783.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED542783.pdf"><span id="translatedtitle">U-<span class="hlt">ALS</span>: A Ubiquitous Learning Environment</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Piovesan, Sandra Dutra; Passerino, Liliana Maria; Medina, Roseclea Duarte</p> <p>2012-01-01</p> <p>The diffusion of the use of the learning virtual environments presents a great potential for the development of an application which meet the necessities in the education area. In view of the importance of a more dynamic application and that can adapt itself continuously to the students' necessities, the "U-<span class="hlt">ALS</span>" (Ubiquitous Adapted Learning…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5649223','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/5649223"><span id="translatedtitle">Low cost, reliable <span class="hlt">ALS</span> turbopump concept</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Csomor, A.</p> <p>1989-01-01</p> <p>An empirical perspective is presented on the cost structure of past and current turbomachinery for liquid rocket engine turbopumps. The issues which must be addressed in the development of turbopumps for the Advanced Launch System (<span class="hlt">ALS</span>) at an order of magnitude lower recurring cost than for present hardware are discussed. An approach proposed to attain reliability and cost objectives is outlined.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/503734','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/503734"><span id="translatedtitle">Bierman {ital et <span class="hlt">al</span>.}Reply:</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Bierman, J.D.; Chan, P.; Liang, J.F.; Kelly, M.P.; Sonzogni, A.A.; Vandenbosch, R.</p> <p>1997-05-01</p> <p>reply to the Comment by C.H.Dasso et <span class="hlt">al</span>., Phys. Rev. Lett. 78,XXX(1997). A Reply to the Comment by C.H. Dasso and J. Fern{acute a}ndez-Niello. {copyright} {ital 1997} {ital The American Physical Society}</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003cnam.conf...72M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003cnam.conf...72M"><span id="translatedtitle">Extensión del Formalismo de Orbitales de Defecto Cuántico <span class="hlt">al</span> tratamiento del efecto Stark (SQDO).</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Menéndez, J. M.; Martín, I.; Velasco, A. M.</p> <p></p> <p>El estudio experimental de las interacciones de átomos Rydberg altamente excitados con campos eléctricos ha experimentado un creciente interés durante las dos últimas décadas debido, en gran medida, <span class="hlt">al</span> desarrollo de nuevas técnicas para crear y estudiar átomos Rydberg en el laboratorio. Acompañando a estas nuevas técnicas experimentales, es necesario el desarrollo de modelos teóricos que nos permitan contrastar sus medidas y conocer mejor los fundamentos de los mismos. Desde el punto de vista teórico el conocimiento del desdoblamiento de los niveles energéticos de un átomo en función de la magnitud del campo eléctrico <span class="hlt">aplicado</span> (lo que se conoce como mapa Stark) es el mejor punto de partida para la descripción del sistema y un prerrequisito fundamental para el cálculo de distintas propiedades atómicas en presencia del campo eléctrico tales como intensidades de transición, umbrales de ionización de campo eléctrico, tiempos de vida, posición y anchura de cruces evitados, etc. En este trabajo presentamos la adaptación del método de orbitales de defecto cuántico [1,2,3] <span class="hlt">al</span> tratamiento del efecto Stark (SQDO) [4] y su aplicación <span class="hlt">al</span> cálculo de los desdoblamientos energéticos y fuerzas de oscilador de estados Rydberg en los átomos de Li, Na y K. El propósito de este estudio es, por un lado, desarrollar métodos fiables para la determinación de propiedades atómicas en presencia de campos eléctricos y, por otro, mostrar la fiabilidad de las funciones de onda QDO en la descripción del efecto Stark en sistemas atómicos.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4293318','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4293318"><span id="translatedtitle"><span class="hlt">ALS</span> onset is influenced by the burden of rare variants in known <span class="hlt">ALS</span> genes</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Cady, Janet; Allred, Peggy; Bali, Taha; Pestronk, Alan; Goate, Alison; Miller, Timothy M.; Mitra, Rob; Ravits, John; Harms, Matthew B.; Baloh, Robert H.</p> <p>2014-01-01</p> <p>Objective To define the genetic landscape of amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) and assess the contribution of possible oligogenic inheritance, we aimed to comprehensively sequence 17 known <span class="hlt">ALS</span> genes in 391 <span class="hlt">ALS</span> patients from the United States. Methods Targeted pooled-sample sequencing was used to identify variants in 17 <span class="hlt">ALS</span> genes. Fragment size analysis was used to define ATXN2 and C9ORF72 expansion sizes. Genotype-phenotype correlations were made with individual variants and total burden of variants. Rare variant associations for risk of <span class="hlt">ALS</span> were investigated at both the single variant and gene level. Results 64.3% of familial and 27.8% of sporadic subjects carried potentially pathogenic novel or rare coding variants identified by sequencing or an expanded repeat in C9ORF72 or ATXN2. 3.8% of subjects had variants in more than one <span class="hlt">ALS</span> gene, and these individuals had disease onset ten years earlier (p=0.0046) than subjects with variants in a single gene. The number of potentially pathogenic coding variants did not influence disease duration or site of onset. Interpretation Rare and potentially pathogenic variants in known <span class="hlt">ALS</span> genes are present in over 25% of apparently sporadic and 64% of familial patients, significantly higher than previous reports using less comprehensive sequencing approaches. A significant number of subjects carried variants in more than one gene, which influenced the age of symptom onset and supports oligogenic inheritance as relevant to disease pathogenesis. PMID:25382069</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011SuMi...49..654H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011SuMi...49..654H"><span id="translatedtitle">Nanocrystalline Fe<span class="hlt">Al</span> intermetallics obtained in mechanically alloyed Fe 50<span class="hlt">Al</span> 40Ni 10 powder</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hadef, F.; Otmani, A.; Djekoun, A.; Grenèche, J. M.</p> <p>2011-06-01</p> <p>B2-Fe 47<span class="hlt">Al</span> 53 intermetallics has been produced by mechanical alloying in a planetary ball mill, using elemental Fe, <span class="hlt">Al</span> and Ni powder mixture. The microstructural and magnetic properties of the mechanically alloyed Fe 50<span class="hlt">Al</span> 40Ni 10 powdered samples were investigated by X-ray diffraction and 57Fe Mössbauer spectrometry at 300 and 77 K. As resulted from the X-ray diffraction studies, the ordered B2 structure was formed in the Fe 50<span class="hlt">Al</span> 40Ni 10 powder, together with the bcc ? i-Fe(<span class="hlt">Al</span>, Ni) ( i = 1, 2) solid solutions. Further milling led to a partial disordering of B2-Fe 47<span class="hlt">Al</span> 53; it has undergone an order-disorder transition which is characterized by an expansion of the volume ? a0 (lattice disorder) and a magnetic transition from the paramagnetic to ferromagnetic state which is characterized by strong ferromagnetic interactions in the alloy. The nanocrystalline bcc ? i-Fe(<span class="hlt">Al</span>, Ni) solid solution was ferromagnetic with a mean crystallite size of 6 nm.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19790025135','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19790025135"><span id="translatedtitle">Some TEM observations of <span class="hlt">Al</span>2O3 scales formed on NiCr<span class="hlt">Al</span> alloys</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Smialek, J.; Gibala, R.</p> <p>1979-01-01</p> <p>The microstructural development of <span class="hlt">Al</span>2O3 scales on NiCr<span class="hlt">Al</span> alloys has been examined by transmission electron microscopy. Voids were observed within grains in scales formed on a pure NiCr<span class="hlt">Al</span> alloy. Both voids and oxide grains grew measurably with oxidation time at 1100 C. The size and amount of porosity decreased towards the oxide-metal growth interface. The voids resulted from an excess number of oxygen vacancies near the oxidemetal interface. Short-circuit diffusion paths were discussed in reference to current growth stress models for oxide scales. Transient oxidation of pure, Y-doped, and Zr-doped NiCr<span class="hlt">Al</span> was also examined. Oriented alpha-(<span class="hlt">Al</span>, Cr)2O3 and Ni(<span class="hlt">Al</span>, Cr)2O4 scales often coexisted in layered structures on all three alloys. Close-packed oxygen planes and directions in the corundum and spinel layers were parallel. The close relationship between oxide layers provided a gradual transition from initial transient scales to steady state <span class="hlt">Al</span>2O3 growth.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19800028901&hterms=corundum&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dcorundum','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19800028901&hterms=corundum&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dcorundum"><span id="translatedtitle">Some TEM observations of <span class="hlt">Al</span>2O3 scales formed on NiCr<span class="hlt">Al</span> alloys</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Smialek, J.; Gibala, R.</p> <p>1979-01-01</p> <p>The microstructural development of <span class="hlt">Al</span>2O3 scales on NiCr<span class="hlt">Al</span> alloys has been examined by transmission electron microscopy. Voids have been observed within grains in scales formed on a pure NiCr<span class="hlt">Al</span> alloy. Both voids and oxide grains grew measurably with oxidation time at 1100 C. The size and amount of porosity decreased towards the oxide-metal growth interface. It was postulated that the voids resulted from an excess number of oxygen vacancies near the oxide-metal interface. Short-circuit diffusion paths were discussed in reference to current growth stress models for oxide scales. Transient oxidations of pure, Y-doped, and Zr-doped NiCr<span class="hlt">Al</span> was also examined. Oriented alpha-(<span class="hlt">Al</span>,Cr)2O3 and Ni(<span class="hlt">Al</span>,Cr)2O4 scales often coexisted in layered structures on all three alloys. Close-packed oxygen planes and directions in the corundum and spinel layers were parallel. The close relationships between oxide layers provided a gradual transition from initial transient scales to steady state <span class="hlt">Al</span>2O3 growth.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_11 --> <div id="page_12" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="221"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21175660','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21175660"><span id="translatedtitle">Electron irradiation of <span class="hlt">Al</span>GaN/GaN and <span class="hlt">Al</span>N/GaN heterojunctions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Polyakov, A. Y.; Smirnov, N. B.; Govorkov, A. V.; Markov, A. V.; Pearton, S. J.; Dabiran, A. M.; Wowchak, A. M.; Cui, B.; Osinsky, A. V.; Chow, P. P.; Kolin, N. G.; Boiko, V. M.; Merkurisov, D. I.</p> <p>2008-10-13</p> <p>The effects of 10 MeV electron irradiation on <span class="hlt">Al</span>GaN/GaN and <span class="hlt">Al</span>N/GaN heterojunctions grown by molecular beam epitaxy are reported. The irradiation increases the resistivity of the GaN buffer due to compensation by radiation defects with levels near E{sub c}-1 eV and decreases the mobility of the two-dimensional electron gas (2DEG) near the <span class="hlt">Al</span>GaN/GaN (or <span class="hlt">Al</span>N/GaN) interface. The bulk carrier removal rate in the GaN buffer is the same for both types of structures and similar to carrier removal rates for undoped n-GaN films. In structures with a density of residual donors of {approx}10{sup 15} cm{sup -3}, irradiation with electron doses of {approx}5x10{sup 15} cm{sup -2} renders the buffer semi-insulating. The 50% degradation of the 2DEG conductivity happens at several times higher doses (close to 3x10{sup 16} cm{sup -2} versus 6.5x10{sup 15} cm{sup -2}) for <span class="hlt">Al</span>N/GaN than for <span class="hlt">Al</span>GaN/GaN structures, most likely because of the lower thickness of the <span class="hlt">Al</span>N barrier.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2001JNET...26..125F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2001JNET...26..125F"><span id="translatedtitle">Thermoelectric Powers of Cells With NaF-<span class="hlt">Al</span>F3-<span class="hlt">Al</span>2O3 Melts</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Flem, Belinda E.; Xu, Qian; Kjelstrup, Signe; Sterten, Åsmund</p> <p>2001-07-01</p> <p>A thermodynamic description of the Peltier heat at the aluminum and the oxygen electrode in the system NaF-<span class="hlt">Al</span>F3-<span class="hlt">Al</span>2O3 is given. The thermoelectric power in melts with molar ratios <italic>n</italic> NaF/<italic>n</italic> <span class="hlt">Al</span>F3 from 3.0 to 1.0, saturated with alumina are measured. Seebeck coefficients for molten fluoride electrolytes saturated with alumina, electrolytes that are relevant for aluminum electrowinning electrolysis cells, are reported. The results allow determinations of Peltier heats of aluminum, oxygen and carbon electrodes in NaF-<span class="hlt">Al</span>F3 electrolytes saturated with alumina. For molar ratios of <italic>n</italic> NaF/<italic>n</italic> <span class="hlt">Al</span>F3 between 2.6 and 1.2, there is a Peltier heating of the aluminum cathode. This heating is in the same order of magnitude as the electrolyte Joule heat, when the current density is 0.7 A cm-2. For molar ratio <italic>n</italic> NaF/<italic>n</italic> <span class="hlt">Al</span>F3 equal to 1.0 the Peltier effect at the aluminum electrode approaches zero. From theoretical considerations we expect a drop also for molar ratio 3.0. For the anode we report a Peltier cooling that is larger than the heat produced by the anodic overvoltage, in melts with NaF/<span class="hlt">Al</span>F3 molar ratio between 2.6 and 1.2 saturated with alumina.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JaJAP..55aAG03W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JaJAP..55aAG03W"><span id="translatedtitle">Aluminum matrix texture in <span class="hlt">Al–Al</span>3Ti functionally graded materials analyzed by electron back-scattering diffraction</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Watanabe, Yoshimi; Sequeira, Paulo D.; Sato, Hisashi; Inamura, Tomonari; Hosoda, Hideki</p> <p>2016-01-01</p> <p><span class="hlt">Al</span> matrix functionally graded materials (FGMs) with oriented <span class="hlt">Al</span>3Ti platelets were fabricated by a centrifugal solid-particle method. The applied centrifugal forces were 30, 60, and 120G (units of gravity). The orientation and volume fraction gradients of the <span class="hlt">Al</span>3Ti platelets within the samples were measured. Since a good lattice correspondence was reported for the close-packed directions and the close-packed planes between <span class="hlt">Al</span> and <span class="hlt">Al</span>3Ti, the <span class="hlt">Al</span> matrix in the <span class="hlt">Al–Al</span>3Ti FGMs fabricated by the centrifugal solid-particle method should have some texture. <span class="hlt">Al</span> matrix texture was, therefore, analyzed by electron back-scattering diffraction (EBSD). Analysis of the resulting pole figures indicates a preferred orientation along the (200) plane for the <span class="hlt">Al</span> matrix crystals. Furthermore, increasing the applied centrifugal force enhances the orientation effect. A correlation appears to exist between platelet orientation and the preferred texture of the <span class="hlt">Al</span> matrix.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012AcSpA..97..885M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012AcSpA..97..885M"><span id="translatedtitle">Investigation and comparison of bovine hemoglobin binding to <span class="hlt">Al</span>13 and <span class="hlt">Al</span>(III): Evidences from spectroscopic studies</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ma, Fei; Sun, Chong; Zhou, Wenshu; Xu, Chongzheng; Zhou, Jiahong; Wang, Guoxiang; Yang, Xiaodi</p> <p>2012-11-01</p> <p>The UV-vis, steady state/time resolved fluorescence spectroscopy and circular dichroism spectroscopy are employed to investigate the interaction mechanisms of <span class="hlt">Al</span>13-Hb and <span class="hlt">Al</span>(III)-Hb, respectively. The UV-vis studies represent that <span class="hlt">Al</span>13 and <span class="hlt">Al</span>(III) could directly disturb the structure of Hb and induce the heme group exposed to the aqueous medium. Steady state/time resolved and synchronous fluorescence spectroscopy reveal that <span class="hlt">Al</span>13 and <span class="hlt">Al</span>(III) can change the polarity around the fluorophore molecule of Hb. <span class="hlt">Al</span>13 makes the protein unfolding and <span class="hlt">Al</span>(III) induces the protein buried inside the structure. The interaction processes are static quenching mechanisms and the main forces are electrostatic interactions. Moreover, circular dichroism spectra display <span class="hlt">Al</span>13 makes greater effect than <span class="hlt">Al</span>(III), which is reflected on the degrees of ?-helix of Hb. The comparison results suggest that <span class="hlt">Al</span>13 displays stronger toxicity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3587753','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3587753"><span id="translatedtitle">An Epidemiological Study of Cutaneous Leishmaniasis in <span class="hlt">Al</span>-Jabal <span class="hlt">Al</span>-Gharbi, Libya</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Abdellatif, Manal Z. M.; El-Mabrouk, Khamis</p> <p>2013-01-01</p> <p>Cutaneous leishmaniasis (CL) is an endemic parasitic infection in the Mediterranean region, including Libya and its <span class="hlt">Al</span>-jabal <span class="hlt">Al</span>-gharbi province. We aimed at studying the occupational relevance as well as other epidemiological aspects of CL. We investigated 140 CL cases who attended at Gharyan outpatient polyclinic during a period of 6 months in 2009. CL infection was clinically diagnosed and confirmed by demonstration of Leishmania parasites on smears from lesions. Our findings showed that males were more affected than females (P=0.04), and people above 10-years were more affected than younger ones (P=0.0001). A significant percent of CL cases belonged to <span class="hlt">Al</span>-Kawasem subprovince (P=0.0001). Farm-related activities were the most frequent occupations among CL cases (P=0.04). In addition to farm workers, housewives and students are at risk groups since they are engaged at farm activities. Moreover, those who have occupations that require staying outdoors for a part of night, e.g., policemen, are also at risk. Compared to children, adult CL patients had multiple lesions (P=0.001) that were more prevalent in their upper and lower extremities than the face (P=0.0001). We conclude that CL is a major health problem in <span class="hlt">Al</span>-jabal <span class="hlt">Al</span>-gharbi province of Libya. The presence of rodents and sandflies makes it a suitable environment for Leishmania to spread in an endemic epidemiological pattern. Being engaged in farming activities or outdoor occupations increases the risk of infection. Various clinical patterns of CL suggest the presence of more than 1 species of Leishmania at <span class="hlt">Al</span>-jabal <span class="hlt">Al</span>-gharbi province. We propose that the 2 species responsible for CL in this area are L. major and L. tropica. Further investigations to identify the leishmanial species responsible for CL at <span class="hlt">Al</span>-jabal <span class="hlt">Al</span>-gharbi together with adoption of preventive and control programs are needed. PMID:23467624</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/605671','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/605671"><span id="translatedtitle">Growth temperature measurements and solidification microstructure selection of primary <span class="hlt">Al</span>{sub 3}Ni and eutectic in the {alpha}<span class="hlt">Al-Al</span>{sub 3}Ni system</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Juarez-Hernandez, A.; Jones, H.</p> <p>1998-02-03</p> <p>Competition between growth of contending primary phases and their eutectics is a key consideration in determining the solidification microstructure of a material that results from particular conditions. Application of the principle that solidification is led by the constituent which grows at the highest temperature under the prevailing conditions gives predictions that are in good accord with experimental fact. The necessary growth temperatures and their dependence on materials composition and solidification conditions have been measured, however, for rather few constituents in relatively few systems as yet. The present purpose is to extend to primary <span class="hlt">Al</span>{sub 3}Ni and the <span class="hlt">Al-Al</span>{sub 3}Ni eutectic in the <span class="hlt">Al</span>-Ni system the measurements made earlier during Bridgman growth, for primary <span class="hlt">Al</span>{sub 3}Fe(<span class="hlt">Al</span>{sub 13}Fe{sub 4}) and for the <span class="hlt">Al-Al</span>{sub 3}Fe and <span class="hlt">Al-Al</span>{sub 6}Fe eutectics in the <span class="hlt">Al</span>-Fe system. These measurements will be compared with predictions of dendrite and eutectic growth theory and related to the relevant boundary of the reported <span class="hlt">Al-Al</span>{sub 3}Ni solidification microstructure selection diagram. Some preliminary results together with other findings were reported earlier in a cited reference.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1000697','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1000697"><span id="translatedtitle">Structure of vapor-phase deposited <span class="hlt">Al</span>-Ge thin films and <span class="hlt">Al</span>-Ge intermediate layer bonding of <span class="hlt">Al</span>-based microchannel structures.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mei, F. H.; Meng, W. J.; Hiller, J.; Miller, D. J.; Materials Science Division; Louisana State Univ.</p> <p>2009-02-01</p> <p><span class="hlt">Al</span>-based high-aspect-ratio microscale structures (HARMS) are basic building blocks for all-<span class="hlt">Al</span> microdevices. Bonding of <span class="hlt">Al</span>-based HARMS is essential for device assembly. In this paper, bonding of <span class="hlt">Al</span>-based HARMS to flat <span class="hlt">Al</span> plates using <span class="hlt">Al</span>-Ge thin film intermediate layers is investigated. The structure of sputter codeposited <span class="hlt">Al</span>-Ge thin films was studied by high-resolution transmission electron microscopy as a function of the average film composition. The structure of the interface region between <span class="hlt">Al</span>-based HARMS bonded to flat <span class="hlt">Al</span> plates is studied by combining focused ion beam sectioning and scanning electron microscopy. An extended bonding interface region, {approx}100 {micro}m in width, is observed and suggested to result from liquidus/solidus reactions as well as diffusion of Ge in solid <span class="hlt">Al</span> at the bonding temperature of 500 C. The extended interface region is suggested to be beneficial to <span class="hlt">Al-Al</span> bonding via <span class="hlt">Al</span>-Ge intermediate layers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006JaJAP..45.3176N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006JaJAP..45.3176N"><span id="translatedtitle">Non-volatile <span class="hlt">Al</span>2O3 Memory using Nanoscale <span class="hlt">Al</span>-rich <span class="hlt">Al</span>2O3 Thin Film as a Charge Storage Layer</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nakata, Shunji; Saito, Kunio; Shimada, Masaru</p> <p>2006-04-01</p> <p>This article describes the fabrication process and capacitance-voltage (C-V) characteristics of a new non-volatile <span class="hlt">Al</span>2O3 memory with nanoscale thin film deposited by electron-cyclotron-resonance sputtering. <span class="hlt">Al</span>-rich <span class="hlt">Al</span>2O3 shows characteristics somewhere between <span class="hlt">Al</span> and <span class="hlt">Al</span>2O3 in the refractive index and wet etching rate. C-V characteristics of <span class="hlt">Al</span>-rich <span class="hlt">Al</span>2O3 memory show a large hysteresis window due to the <span class="hlt">Al</span>-rich structure, while there is no hysteresis window in the case of stoichiometric <span class="hlt">Al</span>2O3. This memory is expected to stay non-volatile for several years or more because the capacitance value after writing and erasing operation remained almost unchanged after 4 h at T=85 °C. Also, another new memory structure comprising SiO2/<span class="hlt">Al</span>2O3 and the <span class="hlt">Al</span>-rich <span class="hlt">Al</span>2O3 structure is proposed, which features increased mobility due to the reduction of electron scattering at the Si/<span class="hlt">Al</span>2O3 interface.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JMMM..387...72M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JMMM..387...72M"><span id="translatedtitle">Ferromagnetic ordering in Np<span class="hlt">Al</span>2: Magnetic susceptibility and 27<span class="hlt">Al</span> nuclear magnetic resonance</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Martel, L.; Griveau, J.-C.; Eloirdi, R.; Selfslag, C.; Colineau, E.; Caciuffo, R.</p> <p>2015-08-01</p> <p>We report on the magnetic properties of the neptunium based ferromagnetic compound Np<span class="hlt">Al</span>2. We used magnetization measurements and 27<span class="hlt">Al</span> NMR spectroscopy to access magnetic features related to the paramagnetic and ordered states (TC=56 K). While very precise DC SQUID magnetization measurements confirm ferromagnetic ordering, they show a relatively small hysteresis loop at 5 K reduced with a coercive field HCo~3000 Oe. The variable offset cumulative spectra (VOCS) acquired in the paramagnetic state show a high sensitivity of the 27<span class="hlt">Al</span> nuclei spectral parameters (Knight shifts and line broadening) to the ferromagnetic ordering, even at room temperature.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011IJTP...50.2790H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011IJTP...50.2790H"><span id="translatedtitle">Revisiting Deng et <span class="hlt">al.'s</span> Multiparty Quantum Secret Sharing Protocol</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hwang, Tzonelih; Hwang, Cheng-Chieh; Yang, Chun-Wei; Li, Chuan-Ming</p> <p>2011-09-01</p> <p>The multiparty quantum secret sharing protocol [Deng et <span class="hlt">al</span>. in Chin. Phys. Lett. 23: 1084-1087, 2006] is revisited in this study. It is found that the performance of Deng et <span class="hlt">al.'s</span> protocol can be much improved by using the techniques of block-transmission and decoy single photons. As a result, the qubit efficiency is improved 2.4 times and only one classical communication, a public discussion, and two quantum communications between each agent and the secret holder are needed rather than n classical communications, n public discussions, and 3n/2 quantum communications required in the original scheme.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JPhCS.653a2039S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JPhCS.653a2039S"><span id="translatedtitle">Superconductivity of <span class="hlt">Al/Al</span>2O3 interface formed under shock-wave conditions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shakhray, D. V.; Avdonin, V. V.; Palnichenko, A. V.; Vyaselev, O. M.</p> <p>2015-11-01</p> <p>A mixture of powdered <span class="hlt">Al</span> and <span class="hlt">Al</span>2O3 has been subjected to a shock-wave pressure of ? 170 kbar, followed by vacuum-encapsulating and quenching of the product to liquid nitrogen. The ac magnetic susceptibility measurements of the samples have revealed metastable superconductivity with Tc ? 37 K, characterized by glassy dynamics of the shielding currents below Tc. Comparison of the ac susceptibility and the dc magnetization measurements infers that the superconductivity arises within the interfacial granular layer formed between metallic <span class="hlt">Al</span> and its oxide due to the shock-wave treatment.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1992GeCoA..56.3831F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1992GeCoA..56.3831F"><span id="translatedtitle">The formation of polynuclear <span class="hlt">Al</span> 13 under simulated natural conditions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Furrer, Gerhard; Trusch, Bernhard; Müller, Christian</p> <p>1992-10-01</p> <p>Polynuclear aluminum species can be formed in nature by the dissolution of <span class="hlt">Al</span>-containing minerals, as a consequence of soil and surface water acidification, followed by neutralization processes. Under simulated natural conditions in the laboratory, i.e., by allowing acidic <span class="hlt">Al</span>(III) solutions to flow over granulated marble at flow velocities of 3-4 mm/min, large fractions of monomeric <span class="hlt">Al</span>(III) were transformed to the <span class="hlt">Al</span> 13O 4(OH) 24(H 2O) 127+ polymer (thereafter referred to as <span class="hlt">Al</span> 13 or <span class="hlt">Al</span> 137+), which was measured by 27<span class="hlt">Al</span>-NMR spectroscopy. Over two-thirds of the monomeric <span class="hlt">Al</span>(III) was converted to polynuclear <span class="hlt">Al</span> 13 even when gibbsite particles were mixed with the marble granules. The <span class="hlt">Al</span> 13 polymer was also formed in stirred batch experiments containing marble granules and dissolved phthalate or salicylate. The results suggest that <span class="hlt">Al</span> 13formation is easily possible in nature if the total <span class="hlt">Al</span>(III) concentration is high enough. In these experiments, <span class="hlt">Al</span> 13 was detected when the total dissolved <span class="hlt">Al</span>(III) was 1.9 × 10 -4 mol/L. The minimum total <span class="hlt">Al</span>(III) concentration required to produce <span class="hlt">Al</span> 13, which can be predicted from available thermodynamic data, is on the order of 10 -5mol/L.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007PhDT.........3S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007PhDT.........3S"><span id="translatedtitle"><span class="hlt">Analisis</span> fotometrico del cumulo abierto NGC 6611</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Suarez Nunez, Johanna</p> <p></p> <p>Matlab programs were designed to apply differential aperture photometry. Two images were taken with a charge-couple device ( CCD ) in the visible V and blue filters, to calculate physical parameters (the flux( f ), the apparent magnitude ( m V ) and its reddening corrected value ( V 0 ), color index ( B- V ) and ( B-V ) 0 , the log of effective temperature (log T eff ), the absolute magnitude ( M V ), the bolometric magnitude ( M B ) & log(L [low *] /[Special characters omitted.] )) of each studied star pertaining to the open cluster NGC 6611. Upon obtaining the parameters, the color-magnitude diagram was graphed and by fitting to the main sequence, the distance modulus and thus the distance to the cluster was found. The stars were assumed to be at the same distance and born at approximately the same moment.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1997SPIE.2921..131Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1997SPIE.2921..131Z"><span id="translatedtitle">Structural evolution of Ti-<span class="hlt">Al</span> via mechanical alloying</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, F.; Lu, Li; Lai, Man O.; Wong, H. Y.</p> <p>1997-03-01</p> <p>Ti<span class="hlt">Al</span> intermetallic compound with composition of Ti-58at.%<span class="hlt">Al</span> was synthesized from elemental Ti and <span class="hlt">Al</span> powder mixture. X-ray measurement showed the presence of both face-centered- tetragonal Ti<span class="hlt">Al</span> phase and face-centered-cubic TiN phase. The formation of Ti<span class="hlt">Al</span> can be divided into three stages: (1) solid solution, (2) partial amorphization, and (3) formation of Ti<span class="hlt">Al</span> phase. The process of formation of Ti<span class="hlt">Al</span> phase via mechanical alloying took about 40 to approximately 50 hours.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MMTB...46..485V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MMTB...46..485V"><span id="translatedtitle">Density of Low-Temperature KF-<span class="hlt">Al</span>F3 Aluminum Baths with <span class="hlt">Al</span>2O3 and <span class="hlt">Al</span>PO4 Additives</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Vasková, Zuzana; Kontrík, Martin; Mlynáriková, Jarmila; Boča, Miroslav</p> <p>2015-02-01</p> <p>The density of the KF-<span class="hlt">Al</span>F3 melts of various KF and <span class="hlt">Al</span>F3 ratio with <span class="hlt">Al</span>2O3 and <span class="hlt">Al</span>PO4 addition has been measured using the Archimedean method. On the basis of the obtained density data the molar volumes of the melts were calculated. These molar volumes decrease with concentration of <span class="hlt">Al</span>2O3 or <span class="hlt">Al</span>PO4. In the system containing <span class="hlt">Al</span>PO4, the relation between cryolite ratios (CRs) vs slopes of molar volume trend lines was identified with excellent correlation factor of R 2 = 0.9844, while in the system containing <span class="hlt">Al</span>2O3 a discontinuity at CR = 2.5 can be observed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10178202','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10178202"><span id="translatedtitle">On the crack growth resistance and strength of the B2 iron aluminides Fe-40<span class="hlt">Al</span>, Fe-45<span class="hlt">Al</span>, and Fe-10Ni-40<span class="hlt">Al</span> (at. %)</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Schneibel, J.H.; Maziasz, P.J.</p> <p>1994-09-01</p> <p>The crack growth resistance and yield strength of the B2 iron aluminides Fe-40<span class="hlt">Al</span>, Fe-45<span class="hlt">Al</span>, are Fe-10Ni-40<span class="hlt">Al</span> (at. %) have been investigated at room temperature laboratory air. After fast cooling from 1273 K, Fe-45<span class="hlt">Al</span> and Fe-10Ni-40<span class="hlt">Al</span> are much stronger than Fe-40<span class="hlt">Al</span>, and exhibit considerably lower crack growth resistance. The crack growth resistance decreases with decreasing crack propagation velocity. Low crack propagation velocities favor intergranular fracture, whereas high velocities can lead to significant contributions from transgranular fracture. Boron additions to Fe-40<span class="hlt">Al</span> and Fe-10Ni-40<span class="hlt">Al</span> improve the crack growth resistance, reduce its dependence on the crack propagation velocity, and cause the path to be predominantly transgranular. In a plot of fracture toughness versus yield strength, the properties of the iron aluminides are similar to those of typical aluminum alloys.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1985PhRvB..32.5525K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1985PhRvB..32.5525K"><span id="translatedtitle">Core-excitonic lines at the <span class="hlt">Al</span> 2p surface optical-absorption threshold of <span class="hlt">Al</span>As and <span class="hlt">Al</span>P</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kelly, M. K.; Niles, D. W.; Perfetti, P.; Colavita, E.; Savoia, A.; Margaritondo, G.; Henzler, M.</p> <p>1985-10-01</p> <p>The optical-absorption spectra of <span class="hlt">Al</span>As and <span class="hlt">Al</span>P exhibit unusual features-strong <span class="hlt">Al</span> 2p core-excitonic lines. The data were obtained with synchrotron-radiation photoemission in the partial-yield mode. The analysis was based on the approach proposed by Johnson, Fock, Ley, and Cardona for <span class="hlt">Al</span>Sb and on Onodera and Toyozawa's exciton theory.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/16523990','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/16523990"><span id="translatedtitle">[Symptomatic management in amyotrophic lateral sclerosis (<span class="hlt">ALS</span>)].</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Czaplinski, A; Schweikert, K; Strobel, W; Steck, A J; Weber, M</p> <p>2006-02-22</p> <p>Although disease-specific treatment of amyotrophic lateral sclerosis is still unsatisfactory, a number of advances have been made in the symptomatic therapy of <span class="hlt">ALS</span> patients within the last decade. Current data suggest that active and aggressive multidisciplinary management of <span class="hlt">ALS</span> patients improve their quality of life and prolong their survival. Patient and caregiver communications and decisions are increasingly recognized to be a relevant part of this management. A wide range of supportive and palliative measures, in particular the widely use of symptomatic drugs for pseudobulbar affect, sialorrhea, and sleep disorders is available to relieve patients symptomatology. In addition, patients quality of life has been profoundly improved by the introduction of enteral nutrition and non-invasive ventilation. PMID:16523990</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24292005','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24292005"><span id="translatedtitle">[Communication with <span class="hlt">ALS</span> patients: neurosurgical approach].</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Yoshimine, Toshiki; Yanagisawa, Takufumi; Sawada, Jin-Ichi; Hazama, Takanori; Mochizuki, Hideki; Hirata, Masayuki</p> <p>2013-01-01</p> <p>By progression of the disease, motor neurons degenerate in patients with amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) eventually lose nearly all voluntary muscles in the body. They are awake and aware but cannot move or communicate (locked-in state). Since the function of the brain is preserved, one possible measure to support their communication is to interpret their motor intention by decoding (deciphering) brain signals and present it with external devices. This technology called "brain-machine interface (BMI)" is now close to clinical use in Japan and USA.In our system, we record electrocorticogram (ECoG) obtained with subudural electrodes during their motor imagery, decode it and determine the movement they intended. So far, one patient of <span class="hlt">ALS</span> with severe paralysis, implanted with this electrodes, successfully operated the PC communication tool only by thinking. PMID:24292005</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20001590','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20001590"><span id="translatedtitle">The mechanical properties of Fe<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Baker, I.; George, E.P.</p> <p>1999-07-01</p> <p>In the last few years, considerable progress has been made in obtaining reproducible mechanical properties data for binary Fe<span class="hlt">Al</span> alloys. Two sets of observations are the foundation of this progress. The first is that the large equilibrium vacancy concentrations that exist in Fe<span class="hlt">Al</span> at high temperature are easily retained during cooling, and that these strongly affect the low-temperature mechanical properties. The second is that room-temperature ductility is adversely affected by water vapor. The purpose of this paper is to highlight their understanding of key phenomena and to show how an understanding of the factors which control the yield strength and fracture behavior has followed from the discovery of the above two effects. 94 refs., 8 figs.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_12 --> <div id="page_13" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="241"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19790025087','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19790025087"><span id="translatedtitle">Development of Si<span class="hlt">Al</span>ON materials</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Layden, G. K.</p> <p>1979-01-01</p> <p>Cold pressing and sintering techniques were used to produce ceramic test specimens in which the major phase was either Si3N4 or a solid solution having the beta Si3N4 structure. Additional components were incorporated to promote liquid phase sintering. Glass and/or crystalline phase were consequently retained in boundaries between Si3N4 grains which largely determined the physical properties of the bodies. Systems investigated most extensively included R-Si-<span class="hlt">Al</span>-O-N (R = rare earth element) Zr-Si-<span class="hlt">Al</span>-O-N, Y-Si-Be-O-N, and R1-R2-Si-O-N. Room temperature and 1370 C modulus of ruptured, 1370 C creep, and oxidation behavior are discussed in terms of phase relationships in a parent quinery, and relavent oxide systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/7375','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/7375"><span id="translatedtitle">Impact of superbends at the <span class="hlt">ALS</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Nishimura, H.; Robin, D.</p> <p>1999-03-19</p> <p>To satisfy a demand for high energy, high brightness x-ray sources at the Advanced Light Source (<span class="hlt">ALS</span>), a plan is in place to replace three 1.3 Tesla normal conducting bending magnets with three 5 Tesla superconducting magnets (superbends) in the year 2001. In this paper they discuss the impact of the superbends on the <span class="hlt">ALS</span> beam parameters and particle dynamics. In particular they show the effect on the emittance, energy spread, and lifetime. They find that by adjusting the dispersion to be positive in the straight section they are able to largely restore the horizontal emittance. The vertical emittance can be adjusted independently to control the lifetime. The particle dynamics are investigated through particle tracking with a frequency analysis postprocessor. They find that by placing the three superbends symmetrically around the ring there is ample dynamic aperture for injection and lifetime.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/792924','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/792924"><span id="translatedtitle">Berkeley Lab's <span class="hlt">ALS</span> generates Femtosecond Synchrotron Radiation</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Robinson, Arthur L.</p> <p>2000-05-23</p> <p>A Lawrence Berkeley National Laboratory (Berkeley Lab) team drawing its members from the Materials Sciences Division (MSD), the Center for Beam Physics in the Accelerator and Fusion Research Division, and the Advanced Light Source (<span class="hlt">ALS</span>) has succeeded in generating 300-femtosecond pulses of synchrotron radiation at the <span class="hlt">ALS</span> synchrotron radiation machine. Though this ''proof-of-principle'' experiment made use of visible light on a borrowed beamline, the laser ''time-slicing'' technique at the heart of the demonstration will soon be applied in a new bend-magnet beamline designed explicitly for the production of femtosecond pulses of X-rays to study long-range and local order in condensed matter with ultrafast time resolution. An undulator beamline based on the same technique has been proposed that will dramatically increase the flux and brightness.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1995AdSpR..15R.123D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1995AdSpR..15R.123D"><span id="translatedtitle"><span class="hlt">Al</span>-26 imaging details from COMPTEL</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Diehl, R.; Knodlseder, J.; Bennett, K.; Bloemen, H.; Dupraz, C.; Hermsen, W.; Lichti, G. G.; Morris, D.; Oberlack, U.; Ryan, J.</p> <p>1995-05-01</p> <p>The Compton Telescope (COMPTEL) map of 1.809 MeV emission from Galactic <span class="hlt">Al</span>-26 is now based on 2 1/2 years of data. Different imaging analysis approaches are discussed: Likelihood maps from point source scans are utilized for searches of emission regions; astrophysical source models are fitted to the measurement with the maximum likelihood method; deconvolved images are produced with the maximum entropy algorithm. Simulations and statistical analysis with the bootstrap method demonstrate that the intensity irregularity and asymmetry along the Galactic plane is significant, although weaker individual features are insignificant by themselves. The comparison of classical <span class="hlt">Al</span>-26 source tracer distributions shows that none of these models represents the COMPTEL data well. The measured 1.809 MeV feature from the Vela region, positionally consistent with the Vela supernova remnant, shows an indication for extended emission.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/960677','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/960677"><span id="translatedtitle">Observable Proxies For 26 <span class="hlt">Al</span> Enhancement</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Fryer, Christopher L; Young, Patrick A; Ellinger, Carola I; Arnett, William D</p> <p>2008-01-01</p> <p>We consider the cospatial production of elements in supernova explosions to find observationally detectable proxies for enhancement of {sup 26}<span class="hlt">Al</span> in supernova ejecta and stellar systems. Using four progenitors we explore a range of 1D explosions at different energies and an asymmetric 3D explosion. We find that the most reliable indicator of the presence of {sup 26}<span class="hlt">Al</span> in unmixed ejecta is a very low S/Si ratio ({approx} 0.05). Production of N in O/S/Si-rich regions is also indicative. The biologically important element P is produced at its highest abundance in the same regions. Proxies should be detectable in supernova ejecta with high spatial resolution multi wavelength observations, but the small absolute abundance of material injected into a proto-planetary disk makes detection unlikely in existing or forming stellar/planetary systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014MS%26E...61a2005A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014MS%26E...61a2005A"><span id="translatedtitle">Stress evolution during ultrasonic <span class="hlt">Al</span> ribbon bonding</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ando, Masaya; Takashima, Kazumasa; Maeda, Masakatsu; Takahashi, Yasuo</p> <p>2014-08-01</p> <p>The present study reveals the stress distribution in the substrate during ultrasonic bonding. The deformations of the Si substrate, <span class="hlt">Al</span> ribbon, and <span class="hlt">Al</span> pad were numerically analyzed using a finite element method. Experimental observation of the interface using a highspeed video camera was also conducted to determine the actual interfacial slip amplitude. This amplitude becomes smaller than that of tool-tip with bonding time. It was suggested from the numerical simulations that frictional adhesion enhanced the friction force, resulting in an increase in the equivalent stress in the ribbon and pad. As a result, very large stresses occur in the substrate during ultrasonic bonding. These stresses evolve with the progress of ultrasonic bonding, i.e., frictional adhesion.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1983JAP....54.3172R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1983JAP....54.3172R"><span id="translatedtitle">Interdiffusion in ? phase Cu-<span class="hlt">Al</span> alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Romig, A. D., Jr.</p> <p>1983-06-01</p> <p>The diffusion behavior of ? phase Cu-<span class="hlt">Al</span> has been studied at 800, 850, and 950 °C using the experimental approach and analysis scheme of Kirkendall and Darken. Diffusion couples were made using the window frame technique and concentration profiles were determined by electron probe microanalysis. The chemical diffusion coefficient, D˜ was found to be D˜=0.65 exp(-42200/RT) cm2/s. The diffusivity was observed to be independent of composition over the range 11-13 wt. % <span class="hlt">Al</span>. The self-diffusion coefficients DCu and DAl were determined to be DAl =0.13 exp(-38900/RT) cm2/s and DCu =2.2 exp(-43400/RT) cm2/s. All activation energies are in calories/mole.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19930070119&hterms=fgm&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dfgm','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19930070119&hterms=fgm&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dfgm"><span id="translatedtitle">Fabrication and properties of functionally graded Ni<span class="hlt">Al/Al</span>2O3 composites</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Miller, D. P.; Lannutti, J. J.; Noebe, R. D.</p> <p>1993-01-01</p> <p>A modified sedimentation process was used in the production of a functionally gradient material (FGM), Ni<span class="hlt">Al/Al</span>2O3. A simple finite element model was used to guide our design and fabrication efforts by estimating residual stress states as a function of composite structure. This approach could lead to tailored designs that enhance or avoid specific residual stress states. Thermal cycling tests were factored into the model to predict time dependent or steady-state internal temperature and stress profiles. Four-point bend tests were conducted to establish the mechanical load-displacement behavior of a single interlayer FGM at room temperature, 800 and 1000 K. Room temperature bend strength of the FGM was 3-4 times that of the base Ni<span class="hlt">Al</span>. At elevated temperatures, composite fracture occurred in a gradual, noncatastrophic mode involving Ni<span class="hlt">Al</span> retardation of a succession of cracks originating in the alumina face.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1007835','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1007835"><span id="translatedtitle">Interdiffusion in the Mg-<span class="hlt">Al</span> system and Intrinsic Diffusion in (<span class="hlt">Al</span>3Mg2) Phase</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Brennan, Sarah; Bermudez, Katrina; Kulkarni, Nagraj S; Sohn, Yong Ho</p> <p>2011-01-01</p> <p>Increasing use and development of lightweight Mg-alloys have led to the desire for more fundamental research in and understanding of Mg-based systems. As a strengthening component, <span class="hlt">Al</span> is one of the most important and common alloying elements for Mg-alloys. In this study, solid-to-solid diffusion couple techniques were employed to examine the interdiffusion between pure Mg and <span class="hlt">Al</span>. Diffusion anneals were carried out at 300 , 350 , and 400 C for 720, 360, and 240 hours, respectively. Optical and scanning electron microscopies (SEM) were employed to observe the formation of the intermetallics -<span class="hlt">Al</span>12Mg17 and -<span class="hlt">Al</span>3Mg2, but not -phase. Concentration profiles were determined using X-ray energy dispersive spectroscopy (XEDS). The growth constants and activation energies were determined for each intermetallic phase.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20863724','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20863724"><span id="translatedtitle">Nonstatistical fluctuations for deep inelastic processes in {sup 27}<span class="hlt">Al</span>+{sup 27}<span class="hlt">Al</span> collisions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Berceanu, I.; Duma, M.; Moisa, D.; Petrovici, M.; Pop, A.; Simion, V.; Zoppo, A. Del; D'Erasmo, G.; Imme, G.; Lanzano, G.; Pagano, A.; Pantaleo, A.; Raciti, G.</p> <p>2006-08-15</p> <p>The excitation functions (EFs) for different fragments produced in the {sup 27}<span class="hlt">Al</span>+{sup 27}<span class="hlt">Al</span> dissipative collisions have been measured in steps of 250 keV in the incident energy range 122-132 MeV. Deep inelastic processes have been selected by integrating events on a total kinetic energy loss window of 12 MeV between 20 and 32 MeV. Large fluctuations are observed in all the studied EFs. Large-channel cross-correlation coefficients confirm the nonstatistical origin of these fluctuations. The energy autocorrelation function (EAF) shows damped oscillation structure as expected when a dinuclear system with a lifetime [{tau}=(5.1{+-}2.1){center_dot}10{sup -21}s], similar with its revolution period (T=4.9{center_dot}10{sup -21}sec), is formed. From the periodicity of the EAF oscillations, information on the deformation of the {sup 27}<span class="hlt">Al</span>+{sup 27}<span class="hlt">Al</span> dinucleus is inferred.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19720050230&hterms=flow+battery&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dflow%2Bbattery','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19720050230&hterms=flow+battery&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dflow%2Bbattery"><span id="translatedtitle">Rechargeable <span class="hlt">Al</span>/Cl2 battery with molten <span class="hlt">Al</span>Cl4/-/ electrolyte.</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Holleck, G. L.; Giner, J.; Burrows, B.</p> <p>1972-01-01</p> <p>A molten salt system based on <span class="hlt">Al</span>- and Cl2 carbon electrodes, with an <span class="hlt">Al</span>Cl3 alkali chloride eutectic as electrolyte, offers promise as a rechargeable, high energy density battery which can operate at a relatively low temperature. Electrode kinetic studies showed that the electrode reactions at the <span class="hlt">Al</span> anode were rapid and that the observed passivation phenomena were due to the formation at the electrode surface of a solid salt layer resulting from concentration changes on anodic or cathodic current flow. It was established that carbon electrodes were intrinsically active for chlorine reduction in <span class="hlt">Al</span>Cl3-alkali chloride melts. By means of a rotating vitreous carbon disk electrode, the kinetic parameters were determined.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21054813','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21054813"><span id="translatedtitle">Fusion cross sections for the 6,7Li+27<span class="hlt">Al</span>, 9Be+27<span class="hlt">Al</span> systems</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Barbara, E. de; Marti, G. V.; Arazi, A.; Capurro, O. A.; Fernandez Niello, J. O.; Figueira, J. M.; Pacheco, A. J.; Ramirez, M.; Rodriguez, M. D.; Testoni, J. E.; Verruno, M.; Padron, I.; Gomes, P. R. S.</p> <p>2007-02-12</p> <p>We present the results of total fusion cross sections measurements for the 6,7Li + 27<span class="hlt">Al</span>, 9Be + 27<span class="hlt">Al</span>, systems at energies above and below the Coulomb barrier (0.8Vb {<=} E {<=} 2.0Vb). The experimental evidence at the measured energy regime show that the total fusion cross sections of 6Li and 9Be with a light mass target are not affected by the break-up process. The elastic break up cross sections for the 6Li + 27<span class="hlt">Al</span> system were also measured and the results are being presented in this issue. The data for the 7Li + 27<span class="hlt">Al</span> system are still being analyzed and therefore these results should be considered preliminary.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ars.usda.gov/research/publications/Publications.htm?seq_no_115=193650','TEKTRAN'); return false;" href="http://www.ars.usda.gov/research/publications/Publications.htm?seq_no_115=193650"><span id="translatedtitle">TRANSCRIPTIONAL ANALYSIS BETWEEN TWO WHEAT NEAR-ISOGENIC LINES CONTRASTING IN ALUMINUM (<span class="hlt">AL</span>) TOLERANCE UNDER <span class="hlt">AL</span> STRESS</span></a></p> <p><a target="_blank" href="http://www.ars.usda.gov/services/TekTran.htm">Technology Transfer Automated Retrieval System (TEKTRAN)</a></p> <p></p> <p></p> <p>To understand the mechanisms of aluminum (<span class="hlt">Al</span>) tolerance and identify genes responsible for <span class="hlt">Al</span> tolerance in wheat (Triticum aestivum L.), suppression subtractive hybridization (SSH) libraries were constructed from <span class="hlt">Al</span>-stressed roots for two wheat near- isogenic lines (NILs), Chisholm-T (<span class="hlt">Al</span>-tolerant) a...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009bime.book..197B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009bime.book..197B"><span id="translatedtitle">Tumor-Wachstumsmodellierung <span class="hlt">als</span> parametrisches Bildregistrierproblem</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Becker, Stefan; Jungmann, Jan Ole; Mang, Andreas; Buzug, Thorsten M.</p> <p></p> <p>In der vorliegenden Arbeit stellen wir ein neues Modell zur Kopplung des Tumormasseeffektes an die, der Wachstumsmodellierung unterliegende, anisotrope Reaktionsdiffusionsgleichung vor. Die Gleichung wird auf einem hochaufgelösten Voxelgitter diskretisiert. Eine Modellierung der Anisotropie des Diffusionsprozesses ermöglicht die Integration von Diffusions-Tensor-Bildgebungsdaten. Die raumfordernde Wirkung des Tumors wird <span class="hlt">als</span> parametrisches Bildregistrierproblem aufgefasst. Hierbei wird die resultierende Verteilung der Tumorzellkonzentration in die zu optimierende Zielfunktion integriert. Erste qualitative Ergebnisse zeigen, dass eine Minimierung der aufgestellten Zielfunktion zu einer plausiblen Modellierung des Masseeffektes führt.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=retrieve&db=pubmed&list_uids=23345638&dopt=AbstractPlus','TOXNETTOXLINE'); return false;" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=retrieve&db=pubmed&list_uids=23345638&dopt=AbstractPlus"><span id="translatedtitle"><span class="hlt">ALS</span> dysphagia pathophysiology: differential botulinum toxin response.</span></a></p> <p><a target="_blank" href="http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?TOXLINE">TOXLINE Toxicology Bibliographic Information</a></p> <p>Restivo DA; Casabona A; Nicotra A; Zappia M; Elia M; Romano MC; Alfonsi E; Marchese-Ragona R</p> <p>2013-02-12</p> <p>OBJECTIVES: This study looked at the effect of botulinum toxin type A (BoTox-A) in patients with amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) with dysphagia due to isolated upper motor neuron (UMN) involvement or combined UMN/lower motor neuron (LMN) impairment associated with oral phase or oropharyngeal muscles involvement. Establishing whether different pathophysiologic mechanisms underlie different responses to BoTox-A treatment may have important implications for patient management.PATIENTS AND METHODS: We screened 35 patients with sporadic <span class="hlt">ALS</span> with dysphagia and included in the study 20 out of 35 with upper esophageal sphincter (UES) hyperactivity. We divided these 20 patients into 2 groups, based on the presence or absence of LMN impairment. Irrespective of the groups, we treated all 20 patients with BoTox-A injected into the UES. The study outcome was dysphagia severity scored using the Penetration/Aspiration Scale (PAS), measured before and 2, 4, and 20 weeks after injection.RESULTS: Significant mean PAS reduction was noted at weeks 2 and 4. The botulinum-dependent PAS reduction was entirely associated with the variability shown by the group of patients with no sign of LMN impairment (group 2) and was not observed in group 1.CONCLUSIONS: The significant improvement observed in patients with isolated UES dysfunction suggests that a different pathophysiology of <span class="hlt">ALS</span> dysphagia predisposes patients to a different response to treatment with BoTox-A. This treatment may represent an alternative treatment to percutaneous endoscopic gastrostomy (PEG) or prolong PEG-free time.CLASSIFICATION OF EVIDENCE: This study provides Class III evidence that botulinum is more effective at 2 and 4 weeks in improving dysphagia in patients with <span class="hlt">ALS</span> with UES hyperactivity without LMN involvement (vs those with LMN involvement).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4568392','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4568392"><span id="translatedtitle">Psychosocial adjustment to <span class="hlt">ALS</span>: a longitudinal study</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Matuz, Tamara; Birbaumer, Niels; Hautzinger, Martin; Kübler, Andrea</p> <p>2015-01-01</p> <p>For the current study the Lazarian stress-coping theory and the appendant model of psychosocial adjustment to chronic illness and disabilities (Pakenham, 1999) has shaped the foundation for identifying determinants of adjustment to <span class="hlt">ALS</span>. We aimed to investigate the evolution of psychosocial adjustment to <span class="hlt">ALS</span> and to determine its long-term predictors. A longitudinal study design with four measurement time points was therefore, used to assess patients' quality of life, depression, and stress-coping model related aspects, such as illness characteristics, social support, cognitive appraisals, and coping strategies during a period of 2 years. Regression analyses revealed that 55% of the variance of severity of depressive symptoms and 47% of the variance in quality of life at T2 was accounted for by all the T1 predictor variables taken together. On the level of individual contributions, protective buffering, and appraisal of own coping potential accounted for a significant percentage in the variance in severity of depressive symptoms, whereas problem management coping strategies explained variance in quality of life scores. Illness characteristics at T2 did not explain any variance of both adjustment outcomes. Overall, the pattern of the longitudinal results indicated stable depressive symptoms and quality of life indices reflecting a successful adjustment to the disease across four measurement time points during a period of about two years. Empirical evidence is provided for the predictive value of social support, cognitive appraisals, and coping strategies, but not illness parameters such as severity and duration for adaptation to <span class="hlt">ALS</span>. The current study contributes to a better conceptualization of adjustment, allowing us to provide evidence-based support beyond medical and physical intervention for people with <span class="hlt">ALS</span>. PMID:26441696</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/5197016','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/5197016"><span id="translatedtitle">Commissioning experiences of the <span class="hlt">ALS</span> booster synchrotron</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kim, C.</p> <p>1991-05-01</p> <p>Installation of the <span class="hlt">ALS</span> booster synchrotron proper was completed on April 30, 1991, and commissioning has just begun. Circulating beam around the booster was observed on the first day of operation, May 3, 1991. The beam was visible for about 400 turns. In this paper we describe the status and commissioning experience of the 1.5-GeV electron synchrotron accelerator. 14 refs., 2 figs., 4 tabs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/11207932','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/11207932"><span id="translatedtitle">Transmission electron microscopy studies of squeeze cast <span class="hlt">Al-Al</span>N composites.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Chédru, M.; Vicens, J.; Chermant, J. L.; Mordike, B. L.</p> <p>2001-02-01</p> <p>Aluminium-matrix composites containing approximately 45 vol.% <span class="hlt">Al</span>N particles were fabricated by melt infiltration of aluminium into an <span class="hlt">Al</span>N preform under a pressure up to 130 MPa. Three types of aluminium alloy (2024, 6060 and 5754) were used. The as-prepared composites were studied by light microscopy, scanning and transmission electron microscopies, and energy-dispersive X-ray spectroscopy. As a result of the melt infiltration process, the composites are very dense and the microstructure shows a homogeneous distribution of the reinforcement. The interfaces are clean with very little porosity. Composites with 2024 and 6060 matrices were carefully studied by transmission electron microscopy (TEM) and high resolution electron microscopy (HREM) after heat treatments. Dislocation density in the matrix of the reinforced material increases due to the difference in thermal expansion coefficients of aluminium alloys and <span class="hlt">Al</span>N. This can induce an accelerated ageing response of the coherent and semicoherent precipitations of age-hardened matrices. This behaviour has been studied in the 2024 and 6060 composites by using microhardness measurements and TEM. Reactions between the <span class="hlt">Al</span>N reinforcement and aluminium matrices (6060 and 5754) were observed and analysed by TEM. Matrices containing some of magnesium display a Mg<span class="hlt">Al</span>2O4 spinel formation at the <span class="hlt">Al</span>N/matrix interface. The spinel formation is probably due to the reaction between magnesium of the matrix and the thin <span class="hlt">Al</span>2O3 layer on the <span class="hlt">Al</span>N surfaces. This reaction can affect the mechanical behaviour of the composite infiltrated with the 5754 matrix. This has been confirmed by overageing some samples at high temperatures (300 degrees C and 550 degrees C) for 10 days in order to emphasize the interfacial reactions. PMID:11207932</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013RuMet2013..633L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013RuMet2013..633L"><span id="translatedtitle">Simulation of aluminothermic smelting of <span class="hlt">Al</span>-Zr and <span class="hlt">Al</span>-Zr-Mo-Sn alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Larionov, A. V.; Chumarev, V. M.; Udoeva, L. Yu.; Mansurova, A. N.; Rylov, A. N.; Raikov, A. Yu.; Aleshin, A. P.; Trubachev, M. V.</p> <p>2013-09-01</p> <p>Aluminothermic smelting of <span class="hlt">Al</span>-Zr and <span class="hlt">Al</span>-Zr-Mo-Sn alloys has been simulated in terms of thermodynamics. The thermodynamic properties of molybdenum and zirconium intermetallic compounds are calculated. It is demonstrated that, with consideration for their formation, the calculated compositions of aluminothermic blends and the forecasted extraction of target metals into an alloy are in good agreement with the data obtained during pilot tests.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/11732280','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/11732280"><span id="translatedtitle">[Symptomatic treatment and palliative care of <span class="hlt">ALS</span>].</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kwieci?ski, H</p> <p>2001-01-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is a neurodegenerative disease, affecting upper and lower motor neurons, which eventually progresses to respiratory deterioration and death in most of the patients. Only one drug, riluzole, has been approved for the treatment of <span class="hlt">ALS</span>. The drug has a benefit, prolonging life by 3-6 months, but the disease progresses inexorably, with no better quality of life. The fundamental role of medicine is sometimes to cure, but always to bring comfort. In current situation, <span class="hlt">ALS</span> patients need adequate palliative care more than anything else. Prognosis and treatment options should be discussed with the patient and the relatives, but full information about the prognosis may deprive the patient of hope. However, disclosure of the prognosis is necessary to obtain informed consent for management decisions such as tracheostomy and artificial ventilation. Nasal positive-pressure ventilation (BiPAP) is an alternative to tracheostomy, at least for some patients without advanced bulbar impairment. Nutritional status in patients who cannot swallow can be efficiently improved by a percutaneous endoscopic gastrostomy. (PEG). PMID:11732280</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_13 --> <div id="page_14" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="261"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/15014726','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/15014726"><span id="translatedtitle">KCAT, Xradia, <span class="hlt">ALS</span> and APS Performance Summary</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Waters, A; Martz, H; Brown, W</p> <p>2004-09-30</p> <p>At Lawrence Livermore National Laboratory (LLNL) particular emphasis is being placed on the nondestructive characterization (NDC) of components, subassemblies and assemblies of millimeter-size extent with micrometer-size features (mesoscale). These mesoscale objects include materials that vary widely in composition, density, geometry and embedded features. Characterizing these mesoscale objects is critical for corroborating the physics codes that underlie LLNL's Stockpile Stewardship mission. In this report we present results from our efforts to quantitatively characterize the performance of several x-ray systems in an effort to benchmark existing systems and to determine which systems may have the best potential for our mesoscale imaging needs. Several different x-ray digital radiography (DR) and computed tomography (CT) systems exist that may be applicable to our mesoscale object characterization requirements, including microfocus and synchrotron systems. The systems we have benchmarked include KCAT (LLNL developed) and Xradia {mu}XCT (Xradia, Inc., Concord, CA), both microfocus systems, and Beamline 1-ID at the Advance Photon Source (APS) and the Tomography Beamline at the Advanced Light Source (<span class="hlt">ALS</span>), both synchrotron based systems. The <span class="hlt">ALS</span> Tomography Beamline is a new installation, and the data presented and analyzed here is some of the first to be acquired at the facility. It is important to note that the <span class="hlt">ALS</span> system had not yet been optimized at the time we acquired data. Results for each of these systems has been independently documented elsewhere. In this report we summarize and compare the characterization results for these systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/7278143','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/7278143"><span id="translatedtitle">Precipitation hardening in ternary alloys of the <span class="hlt">Al</span>-Sc-Cu and <span class="hlt">Al</span>-Sc-Si systems</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kharakterova, M.L.; Eskin, D.G.; Toropova, L.S. . A.A. Baikov Inst. of Metallurgy)</p> <p>1994-07-01</p> <p>The processes of precipitation hardening in cast ternary alloys of the <span class="hlt">Al</span>-Sc-Cu and <span class="hlt">Al</span>-Sc-Si systems were studied in the temperature range of aging from 100 to 450 C and at exposures to 200 h. It was shown that the Cu<span class="hlt">Al</span>[sub 2] and Sc<span class="hlt">Al</span>[sub 3] phases were involved in the process of aging in ternary <span class="hlt">Al</span>-Sc-Cu alloys, and the Si and V (<span class="hlt">Al</span>SiSc) phases, in ternary <span class="hlt">Al</span>-Sc-Si alloys with excess silicon in a supersaturated solid solution. The V phase was for the first time revealed as the hardening phase in aluminum alloys.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/364119','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/364119"><span id="translatedtitle">The rates of water exchange in <span class="hlt">Al</span>(III)-salicylate and <span class="hlt">Al</span>(III)-sulfosalicylate complexes</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Sullivan, D.J.; Nordin, J.P.; Phillips, B.L.; Casey, W.H.</p> <p>1999-05-01</p> <p>Rate parameters are reported for exchange of hydration waters from the inner coordination sphere of <span class="hlt">Al</span>(III)-sulfosalicylate [<span class="hlt">Al</span>(sSal){sup +}] and <span class="hlt">Al</span>(III)-salicylate [<span class="hlt">Al</span>(Sal){sup +}] complexes to bulk solution as determined with {sup 17}O-NMR. The rate parameters for the <span class="hlt">Al</span>(sSal){sup +} complex are: K{sub ex}{sup 298} = (3.0 {+-} 0.2){center_dot}10{sup 3} s{sup {minus}1}, {Delta}H{sup {double_dagger}} = 37({+-}3)kJ/mol, {Delta}S{sup {double_dagger}} = {minus}54({+-}9) J/mol K; and for the <span class="hlt">Al</span>(Sal){sup +} complex are: k{sub ex}{sup 298} = 4.9({+-}0.3){center_dot}10{sup 3} s{sup {minus}1}, {Delta}H{sup {double_dagger}} = 35({+-}3) kJ/mol, {Delta}S{sup {double_dagger}} = {minus}57({+-}11) J/mol K. These results, along with previous work, suggest that the lability of water molecules in bidentate carboxylate-phenolic complexes scales with the electron-donating properties of the ligand oxygens. Replacement of a coordinated carboxyl with a phenolic group in the ligand increases both the Lewis basicity and the value of k{sub ex}{sup 298}. A correlation between these parameters is proposed that can be used to predict rate coefficients for other bidentate aluminum complexes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007JPhD...40.4653N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007JPhD...40.4653N"><span id="translatedtitle"><span class="hlt">Al</span> composition dependent structural and electrical properties of In<span class="hlt">Al</span>GaN/GaN heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nagarajan, S.; Senthil Kumar, M.; Choi, Y. J.; Chung, S. J.; Hong, C.-H.; Suh, E.-K.</p> <p>2007-08-01</p> <p>In<span class="hlt">Al</span>GaN/GaN heterostructures with various <span class="hlt">Al</span> compositions have been grown on sapphire substrate using the metal organic chemical vapour deposition technique. The solid-to-gas phase ratio indicates a high <span class="hlt">Al</span> incorporation efficiency. Atomic force microscopy reveals a smooth surface with the formation of hexagonal pits. The size and the density of the hexagonal pits increase with increasing <span class="hlt">Al</span> mole fraction. The Hall effect and the capacitance-voltage (C-V) studies show the formation of a two-dimensional electron gas (2DEG) at the In<span class="hlt">Al</span>GaN/GaN interface. A relatively higher Hall sheet carrier density compared with the 2DEG density estimated from the C-V profile indicates parallel conduction via the underlying GaN layer. It is observed that the 2DEG density decreases as a function of the <span class="hlt">Al</span> composition and these results are discussed based on the increasing depth of the hexagonal pit and the background donor density.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19790056074&hterms=kdp&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dkdp','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19790056074&hterms=kdp&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dkdp"><span id="translatedtitle">Internal photoemission in Ag-<span class="hlt">Al</span>2O3-<span class="hlt">Al</span> junctions</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Guedes, J. M. P.; Slayman, C. W.; Gustafson, T. K.; Jain, R. K.</p> <p>1979-01-01</p> <p>The magnitude of the photon-induced current in Ag-<span class="hlt">Al</span>2O3-<span class="hlt">Al</span> metal-oxide-metal junctions has been studied as a function of photon energy and angle of incident radiation. Photocurrents were theoretically analyzed on the basis of a modified vacuum photoemission model (Jain, 1975; Slayman et <span class="hlt">al</span>., to be published). Optical constants previously reported in the literature (Irani et <span class="hlt">al</span>., 1971; Ehnrereich et <span class="hlt">al</span>., 1963) were used to calculate the true spatial generation rate in Ag and <span class="hlt">Al</span> as a function of the angle, polarization of incident radiation, and film thickness. Results were found to be in very good agreement with experimentally determined values for a tunable dye laser with a KDP doubling crystal pumped by a Q-switched Nd:YAG laser with a LiIO3 doubling crystal. The system provided risetimes of 50 ns or less and peak powers of 10 W. Under short circuit conditions, the photoresponse to incident power was linear up to available power densities of 10 kW/sq cm. Quantum efficiencies of about 0.1% at zero-bias, near 3.8 eV under P polarization, were typically observed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1996PhRvB..54.8501K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1996PhRvB..54.8501K"><span id="translatedtitle">Electronic structure of <span class="hlt">Al</span>3Ni and <span class="hlt">Al</span>Ni3 alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kovács, Zs.; Kövér, L.; Weightman, P.; Varga, D.; Sanjinés, R.; Pálinkás, J.; Margaritondo, G.; Adachi, H.</p> <p>1996-09-01</p> <p>Experimental <span class="hlt">Al</span> KL23V and Ni LMM Auger and high-resolution valence band XPS spectra of <span class="hlt">Al</span>3Ni and <span class="hlt">Al</span>Ni3 alloys are presented and compared to the corresponding spectra of pure metals. The spectra are interpreted in terms of the results of the discrete-variational (DV)-X? cluster MO model using atomic Auger transition probabilities. Good agreement has been obtained between the theory and experiment concerning the energy widths of the spectra. For <span class="hlt">Al</span>3Ni the total number of electrons at the Fermi level obtained from the calculations agrees better with the experimental value than those from previous calculations. In the case of the alloys, the calculated charge transfer is small (<0.4 electrons), playing only a minor role in the filling of the Ni d band. The hybridization between the Ni d and <span class="hlt">Al</span> s and p bands can be deduced from the reduction of the <span class="hlt">Al</span> s and p DOS at the Ni d resonance energy. Our results suggest that for these alloys the corresponding Auger matrix elements do not depend on the Auger transition energy. The Ni LMM spectra of the alloys demonstrate the localization of the Ni d band.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1998PhRvB..5815078G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1998PhRvB..5815078G"><span id="translatedtitle">Strong coupling effects in (Nb-<span class="hlt">Al-Al</span>Ox)2-Nb stacked Josephson junctions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Goldobin, E.; Kupriyanov, M. Yu.; Nevirkovets, I. P.; Ustinov, A. V.; Blamire, M. G.; Evetts, J. E.</p> <p>1998-12-01</p> <p>Stacked (Nb-<span class="hlt">Al-Al</span>Ox)2-Nb long Josephson junctions with very thin intermediate Nb-<span class="hlt">Al</span> superconducting layer are investigated experimentally and theoretically. Stable coherent in-phase zero-field steps (ZFS's) are observed; both the critical current and the maximum ZFS current dependence on magnetic field are measured to prove the in-phase nature of this mode. The dependences are in good agreement with the inductive coupling model. The Swihart velocities for in-phase (c¯+) and antiphase (c¯-) modes are measured for different lengths of the stacks. In order to make a proper interpretation of the experimental results, an extension of the existing model is developed, taking into account the fact that the middle electrode consists of two different superconductors (Nb and proximized <span class="hlt">Al</span>). A comparison of a new model with the conventional model and experimental data is made. The extended model gives the c¯+/c¯- ratio as 30% different from what the conventional model predicts. For thin Nb and <span class="hlt">Al</span> layers the correction factor depends only on the ratio of the magnetic field penetration depths in Nb and proximized <span class="hlt">Al</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25170561','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25170561"><span id="translatedtitle">TEM and HRTEM characterization of Ti<span class="hlt">Al</span> diffusion bonds using Ni/<span class="hlt">Al</span> nanolayers.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Simões, Sónia; Viana, Filomena; Ramos, Ana S; Vieira, Maria T; Vieira, Manuel F</p> <p>2015-02-01</p> <p>Diffusion bonding of Ti<span class="hlt">Al</span> alloys can be enhanced by the use of reactive nanolayer thin films as interlayers. Using these interlayers, it is possible to reduce the conventional bonding conditions (temperature, time, and pressure) and obtain sound and reliable joints. The microstructural characterization of the diffusion bond interfaces is a fundamental step toward understanding and identifying the bonding mechanisms and relating them to the strength of the joints. The interface of Ti<span class="hlt">Al</span> samples joined using Ni/<span class="hlt">Al</span> nanolayers was characterized by transmission electron microscopy and scanning transmission electron microscopy. Microstructural characterization of the bond revealed that the interfaces consist of several thin layers of different composition and grain size (nanometric and micrometric). The bonding temperature (800, 900, or 1,000°C) determines the grain size and thickness of the layers present at the interface. Phase identification by high-resolution transmission electron microscopy combined with fast Fourier transform and electron energy-loss spectroscopy analyses reveals the presence of several intermetallic compounds: <span class="hlt">Al</span>TiNi, Ni<span class="hlt">Al</span>, and <span class="hlt">Al</span>2TiNi. For bonds produced at 800 and 900°C, nanometric grains of Ti were detected at the center of the interface. PMID:25170561</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009JTST...18..536G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009JTST...18..536G"><span id="translatedtitle">Fe<span class="hlt">Al</span> and Nb<span class="hlt">Al</span>3 Intermetallic-HVOF Coatings: Structure and Properties</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Guilemany, J. M.; Cinca, N.; Dosta, S.; Cano, I. G.</p> <p>2009-12-01</p> <p>Transition metal aluminides in their coating form are currently being explored in terms of resistance to oxidation and mechanical behavior. This interest in transition metal aluminides is mainly due to the fact that their high <span class="hlt">Al</span> content makes them attractive for high-temperature applications. This is also a reason to study their resistance to wear; they may be suitable for use in applications that produce a lot of wear in aggressive environments, thus replacing established coating materials. In this study, the microstructure, microhardness, and wear and oxidation performance of Fe<span class="hlt">Al</span> and Nb<span class="hlt">Al</span>3 coatings produced by high-velocity oxy-fuel spraying are evaluated with two main aims: (i) to compare these two coating systems—a commonly studied aluminide (Fe<span class="hlt">Al</span>) and, Nb<span class="hlt">Al</span>3, an aluminide whose deposition by thermal spraying has not been attempted to date—and (ii) to analyze the relationship between their microstructure, composition and properties, and so clarify their wear and oxidation mechanisms. In the present study, the higher hardness of niobium aluminide coatings did not correlate with a higher wear resistance and, finally, although pesting phenomena (disintegration in oxidizing environments) were already known of in bulk niobium aluminides, here their behavior in the coating form is examined. It was shown that such accelerated oxidation was inevitable with respect to the better resistance of Fe<span class="hlt">Al</span>, but further improvements are foreseen by addition of alloying elements in that alloy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011APS..SHK.Q2004Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011APS..SHK.Q2004Z"><span id="translatedtitle">Air Blast Characteristics for Laminate <span class="hlt">Al</span> and <span class="hlt">Al</span>-Ni Composites</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Fan</p> <p>2011-06-01</p> <p>Air blast characteristics of laminate <span class="hlt">Al</span> and <span class="hlt">Al</span>-Ni composites were investigated in a 23 m3 closed chamber. 50 to 100 ?m thick <span class="hlt">Al</span>-Ni or <span class="hlt">Al</span> foils were rolled to form a cylindrical shell, which was then compacted to a density larger than 99% TMD through an explosive formation technique. Charges were prepared using 2 kg C4 explosive packed in the laminate metal shell to a metal-explosive mass ratio of 1.75. Pressure and temperature were measured through transducers on the chamber wall and pyrometry sensors facing the charge center. The pressure history showed a double-shock front structure with an accelerating precursor shock of high amplitude followed by the primary blast, suggesting considerable early-time reaction of small laminate fragments. Significant enhanced explosion pressure (QSP) was observed as compared with baseline charges in solid shell. Recovered residue showed fragments in flakes with a considerable fraction in the molten. The pressure and temperature results are further analyzed to distinguish the reaction properties between the <span class="hlt">Al</span>-Ni (gasless reaction for them alone) and <span class="hlt">Al</span> laminates as well as their effect on air blast. The results are also compared with previous investigations using various shell materials and compositing techniques.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/280018','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/280018"><span id="translatedtitle">The protective coatings of NdFeB magnets by <span class="hlt">Al</span> and <span class="hlt">Al</span>(Fe)</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Qin, C.; Li, A.S.; Ng, D.H.</p> <p>1996-04-01</p> <p>NdFeB permanent magnets are coated by two different methods, dip coating and evaporation coating, with <span class="hlt">Al</span>. It is found that an intermetallic reaction has occurred and formed a dominant phase of Fe<span class="hlt">Al</span>{sub 2.5}B{sub {ital x}} at the interface between the <span class="hlt">Al</span> coating and the magnet material. Such reaction enhances strong bonding between the coating and the magnet. When <span class="hlt">Al</span>(Fe) is used for the coating, no detectable intermetallic phase is observed, and therefore the amount of magnet material is conserved. We have studied the effect of the intermetallic phase on corrosion protection of the magnet. It is found that this phase is less resistive towards HNO{sub 3} solution than pure <span class="hlt">Al</span>; but it is more resistive towards NaOH and NaCl. The investigation of the changes of microstructures of the coatings under different tempering conditions have also been carried out. The results show that the heat treatment at 500{degree}C for 10 min for a {approximately} 2 {mu}m thick <span class="hlt">Al</span> coating by evaporation can produce an optimal layer of intermetallics. If the temperature is too low, the coating will not adhere to the magnet or if too high, it will fully react with the magnet and produce a rough coating surface. {copyright} {ital 1996 American Institute of Physics.}</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22261715','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22261715"><span id="translatedtitle">A comparative wear study on <span class="hlt">Al</span>-Li and <span class="hlt">Al</span>-Li/SiC composite</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Okumus, S. Cem Karslioglu, Ramazan Akbulut, Hatem</p> <p>2013-12-16</p> <p>Aluminum-lithium based unreinforced (<span class="hlt">Al</span>-8090) alloy and <span class="hlt">Al</span>-8090/SiCp/17 vol.% metal matrix composite produced by extrusion after spray co-deposition. A dry ball-on disk wear test was carried out for both alloy and composite. The tests were performed against an <span class="hlt">Al</span>{sub 2}O{sub 3} ball, 10 mm in diameter, at room temperature and in laboratory air conditions with a relative humidity of 40-60%. Sliding speed was chosen as 1.0 ms{sup ?1} and normal loads of 1.0, 3.0 and 5.0 N were employed at a constant sliding distance of 1000 m. The wear damage on the specimens was evaluated via measurement of wear depth and diameter. Microstructural and wear characterization was carried out via scanning electron microscopy (SEM). The results showed that wear loss of the <span class="hlt">Al</span>-8090/SiC composite was less than that of the <span class="hlt">Al</span>-8090 matrix alloy. Plastic deformation observed on the wear surface of the composite and the matrix alloy, and the higher the applied load the greater the plastic deformation. Scanning electron microscopy examinations of wear tracks also reveal that delamination fracture was the dominant wear mechanism during the wear progression. Friction coefficient was maximum at the low applied load in the case of the <span class="hlt">Al</span>-8090/SiC composite while a gradual increase was observed with applied load for the matrix alloy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JMEP...24.1279P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JMEP...24.1279P"><span id="translatedtitle">Softening Kinetics in High <span class="hlt">Al</span> and High <span class="hlt">Al</span>-Nb-Microalloyed Steels</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Pereda, B.; Aretxabaleta, Z.; López, B.</p> <p>2015-03-01</p> <p>Double-hit torsion tests were performed in order to study the effect of high <span class="hlt">Al</span> levels (up to 2 wt.%) and Nb microalloying (up to 0.07 wt.%) on the static softening kinetics of 0.2%C-2%Mn steels. The addition of 1%<span class="hlt">Al</span> leads to a delay in the softening kinetics due to solute-drag effect, equivalent to that exerted by 0.027%Nb. For the 2%<span class="hlt">Al</span> steels, at temperatures below 1000 °C, ? ? ? phase transformation occurs after deformation, resulting in a larger retardation of the softening kinetics. At temperatures higher than 1000 °C, Nb in solid solution also contributes to the retardation of the static softening kinetics, and at lower temperatures NbC strain-induced precipitation leads to incomplete softening for the 1%<span class="hlt">Al</span> steel, and to a complex interaction between softening, phase transformation, and NbC strain-induced precipitation for the 2%<span class="hlt">Al</span>-Nb steels. The effect of <span class="hlt">Al</span> on the static softening kinetics was quantified and introduced in a model developed in previous works for the prediction of the austenite microstructural evolution. In order to validate the results of the model, multipass torsion tests were carried out at conditions representative of hot strip and plate rolling mills. Model predictions show reasonable agreement with the results obtained at different deformation conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3472785','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3472785"><span id="translatedtitle">Room Temperature Radiolytic Synthesized Cu@Cu<span class="hlt">Al</span>O2-<span class="hlt">Al</span>2O3 Nanoparticles</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Abedini, Alam; Saion, Elias; Larki, Farhad; Zakaria, Azmi; Noroozi, Monir; Soltani, Nayereh</p> <p>2012-01-01</p> <p>Colloidal Cu@Cu<span class="hlt">Al</span>O2-<span class="hlt">Al</span>2O3 bimetallic nanoparticles were prepared by a gamma irradiation method in an aqueous system in the presence of polyvinyl pyrrolidone (PVP) and isopropanol respectively as a colloidal stabilizer and scavenger of hydrogen and hydroxyl radicals. The gamma irradiation was carried out in a 60Co gamma source chamber with different doses up to 120 kGy. The formation of Cu@Cu<span class="hlt">Al</span>O2-<span class="hlt">Al</span>2O3 nanoparticles was observed initially by the change in color of the colloidal samples from colorless to brown. Fourier transform infrared spectroscopy (FTIR) confirmed the presence of bonds between polymer chains and the metal surface at all radiation doses. Results of transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDX), and X-ray diffraction (XRD) showed that Cu@Cu<span class="hlt">Al</span>O2-<span class="hlt">Al</span>2O3 nanoparticles are in a core-shell structure. By controlling the absorbed dose and precursor concentration, nanoclusters with different particle sizes were obtained. The average particle diameter increased with increased precursor concentration and decreased with increased dose. This is due to the competition between nucleation, growth, and aggregation processes in the formation of nanoclusters during irradiation. PMID:23109893</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009APS..NWS.B2009N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009APS..NWS.B2009N"><span id="translatedtitle">Jump frequencies of tracer atoms on <span class="hlt">Al</span>-sites in <span class="hlt">Al</span>4Ba phases</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Newhouse, Randal; Collins, Gary S.</p> <p>2009-05-01</p> <p>The <span class="hlt">Al</span>4Ba structure has two inequivalent <span class="hlt">Al</span> sites with collinear electric field gradients (EFGs) of unequal magnitude. Nuclear quadrupole interactions (NQIs) were measured at ^111In/Cd probe atoms in <span class="hlt">Al</span>4Ba, In4Ba and <span class="hlt">Al</span>4Eu phases using perturbed angular correlation spectroscopy (PAC). The probes were found to occupy both <span class="hlt">Al</span>-type sites. At low temperature, two NQI frequencies were detected that, with increasing temperature, approached each other and merged at ˜400 C, above which only a single NQI was observed. This is attributed to rapid jumping of probe atoms between the <span class="hlt">Al</span>-sites, leading to motional averaging of the EFGs. Merging occurs at the temperature for which the jump frequency equals the difference between static NQI frequencies. Since differences in static frequencies were all about 20 Mrad/s, we conclude that the jump frequencies equaled about 3 MHz at ˜400 C in each phase. This type of motional averaging differs from motional averaging through reorientation of EFGs observed in previous work [Phys. Rev. Lett. 92, 225901 (2004)]. This work was supported in part by the NSF under grant DMR 05-04843 (Metals Program).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012MS%26E...39a2010T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012MS%26E...39a2010T"><span id="translatedtitle">Reactive HIPIMS with auxiliary <span class="hlt">Al</span> electrode for ZnO:<span class="hlt">Al</span> thin film deposition</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tiron, Vasile; Costin, Claudiu; Sirghi, Lucel; Popa, Gheorghe</p> <p>2012-09-01</p> <p>In this paper a new technique is proposed for precise doping control of ZnO:<span class="hlt">Al</span> thin films deposited in reactive High Power Impulse Magnetron Sputtering (HIPIMS). An auxiliary aluminum electrode was added to a reactive Ar/O2 pulsed magnetron with planar Zn target in order to obtain a controlled doping of ZnO films. <span class="hlt">Al</span> neutral density in gas phase has been controlled by the discharge current and the biasing voltage on the auxiliary electrode (which influence the ion bombardment of the electrode) and measured by laser resonant absorption spectroscopy. The fraction of <span class="hlt">Al</span> dopant in the deposited films was estimated by X-ray Photoelectron Spectroscopy (XPS) measurements. The goal of this work was to correlate <span class="hlt">Al</span> density measured in the gas phase with <span class="hlt">Al</span> concentration in the deposited films. It was also investigated the effect of the aluminum concentration on the structural, electrical and optical properties of ZnO:<span class="hlt">Al</span> thin films deposited by HIPIMS. The internal microstructure and chemical composition of the deposited films was examined by X-ray difractometry (XRD) and X-ray Photoelectron Spectroscopy (XPS). The optical properties of the deposited films were studied by UV/VIS and photoluminescence spectroscopy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/19409689','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/19409689"><span id="translatedtitle">Study on the hydrolysis/precipitation behavior of Keggin <span class="hlt">Al</span>13 and <span class="hlt">Al</span>30 polymers in polyaluminum solutions.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Chen, Zhaoyang; Luan, Zhaokun; Jia, Zhiping; Li, Xiaosen</p> <p>2009-06-01</p> <p>The hydrolysis/precipitation behaviors of <span class="hlt">Al</span>(3+), <span class="hlt">Al</span>(13) and <span class="hlt">Al</span>(30) under conditions typical for flocculation in water treatment were investigated by studying the particulates' size development, charge characteristics, chemical species and speciation transformation of coagulant hydrolysis precipitates. The optimal pH conditions for hydrolysis precipitates formation for <span class="hlt">Al</span>Cl(3), PAC(<span class="hlt">Al</span>13) and PAC(<span class="hlt">Al</span>30) were 6.5-7.5, 8.5-9.5, and 7.5-9.5, respectively. The precipitates' formation rate increased with the increase in dosage, and the relative rates were <span class="hlt">Al</span>Cl(3)>PAC(<span class="hlt">Al</span>30)>PAC(<span class="hlt">Al</span>13). The precipitates' size increased when the dosage increased from 50 microM to 200 microM, but it decreased when the dosage increased to 800 microM. The Zeta potential of coagulant hydrolysis precipitates decreased with the increase in pH for the three coagulants. The iso-electric points of the freshly formed precipitates for <span class="hlt">Al</span>Cl(3), PAC(<span class="hlt">Al</span>13) and PAC(<span class="hlt">Al</span>30) were 7.3, 9.6 and 9.2, respectively. The Zeta potentials of <span class="hlt">Al</span>Cl(3) hydrolysis precipitates were lower than those of PAC(<span class="hlt">Al</span>13) and PAC(<span class="hlt">Al</span>30) when pH>5.0. The Zeta potential of PAC(<span class="hlt">Al</span>30) hydrolysis precipitates was higher than that of PAC(<span class="hlt">Al</span>13) at the acidic side, but lower at the alkaline side. The dosage had no obvious effect on the Zeta potential of hydrolysis precipitates under fixed pH conditions. The increase in Zeta potential with the increase in dosage under uncontrolled pH conditions was due to the pH depression caused by coagulant addition. <span class="hlt">Al</span>-Ferron research indicated that the hydrolysis precipitates of <span class="hlt">Al</span>Cl(3) were composed of amorphous <span class="hlt">Al</span>(OH)(3) precipitates, but those of PAC(<span class="hlt">Al</span>13) and PAC(<span class="hlt">Al</span>30) were composed of aggregates of <span class="hlt">Al</span>(13) and <span class="hlt">Al</span>(30), respectively. <span class="hlt">Al</span>(3+) was the most un-stable species in coagulants, and its hydrolysis was remarkably influenced by solution pH. <span class="hlt">Al</span>(13) and <span class="hlt">Al</span>(30) species were very stable, and solution pH and aging had little effect on the chemical species of their hydrolysis products. The research method involving coagulant hydrolysis precipitates based on <span class="hlt">Al</span>-Ferron reaction kinetics was studied in detail. The <span class="hlt">Al</span> species classification based on complex reaction kinetic of hydrolysis precipitates and Ferron reagent was different from that measured in a conventional coagulant assay using the <span class="hlt">Al</span>-Ferron method. The chemical composition of <span class="hlt">Al</span>(a), <span class="hlt">Al</span>(b) and <span class="hlt">Al</span>(c) depended on coagulant and solution pH. The <span class="hlt">Al</span>(b) measured in the current case was different from Keggin <span class="hlt">Al</span>(13), and the high <span class="hlt">Al</span>(b) content in the <span class="hlt">Al</span>Cl(3) hydrolysis precipitates could not used as testimony that most of the <span class="hlt">Al</span>(3+) was converted to highly charged <span class="hlt">Al</span>(13) species during <span class="hlt">Al</span>Cl(3) coagulation. PMID:19409689</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012PhyS...85e5601B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012PhyS...85e5601B"><span id="translatedtitle">Phase transformation in rapidly solidified <span class="hlt">Al-Al</span>2O3 alloys by high-frequency melting</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bourbia, A.; Boulkhessaim, S.; Bedboudi, H.; Draissia, M.</p> <p>2012-05-01</p> <p>The microstructure properties of rapidly solidified <span class="hlt">Al</span>-0-40 wt% (?-<span class="hlt">Al</span>2O3) alloys by high-frequency (HF) melting were investigated by means of x-ray diffraction measurements, optical observations and combined scanning electronic microscopy and energy-dispersive x-ray spectroscopy (SEM/EDX) analyses. Phase transformation was correlated by heat treatment with pure <span class="hlt">Al</span> and solid ?-<span class="hlt">Al</span>2O3 alumina spectra. It was found that the microstructure is a solid solution of the <span class="hlt">Al</span> phase with a notable solubility of ?-<span class="hlt">Al</span>2O3 in the <span class="hlt">Al</span> matrix for lower contents. For 4wt.% of alumina compositions and above, it was a mixture of phases, <span class="hlt">Al</span> solid solution and ?-<span class="hlt">Al</span>2O3, with a tendency to reach the ?-<span class="hlt">Al</span>2O3 alumina morphology. Other forms of alumina phases are observed in the heat-treated (HF) alloys.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26717713','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26717713"><span id="translatedtitle">[<span class="hlt">Al</span>3+ Absorption and Assimilation by Four Ectomycorrhizal Fungi].</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wang, Ming-xia; Yuan, Ling; Huang, Jian-guo; Zhou, Zhi-feng</p> <p>2015-09-01</p> <p>The present experiment was carried out in order to know the resistance mechanism of the ectomycorrhizal (ECM) fungi under <span class="hlt">Al</span> stress, to establish the theoretical foundation to alleviate the <span class="hlt">Al</span> toxicity of trees, to guide the selection of <span class="hlt">Al</span>-resisted ECM fungi and preserve forest health. The absorption and assimilation of <span class="hlt">Al</span>3+ by four ECM fungi [Pisolithus tinctorius (Pt 715), Suillus luteus (Sl 08 and Sl 14), Gyroporus cyanescens (Gc 99)], which were isolated from different forest soils, were investigated in pure culture in liquid media. The growths of Pt 715 and Sl 08 were less affected by <span class="hlt">Al</span>3+, but growths of S114 and Gc 99 were obviously inhibited by <span class="hlt">Al</span>3+. With the increasing of <span class="hlt">Al</span>3+ concentration in culture, the absorption and assimilation of <span class="hlt">Al</span>3+ by four ECM fungi increased. It indicated that the concentration of <span class="hlt">Al</span>3+ in environments might be the primary factor determining the <span class="hlt">Al</span>3+ content in the cell of each tested fungi. Amounts of <span class="hlt">Al</span>3+ absorbed (in total or calculated in unit hyphae) by the <span class="hlt">Al</span>3+ tolerant strains (Pt 715 and Sl 08) were significantly lower than those by the <span class="hlt">Al</span>3+ sensitive strains (S1 14 and Gc 99), which illustrated that reducing the absorption of <span class="hlt">Al</span>3+ under <span class="hlt">Al</span>3+ stress environment might be an effective approach to alleviate the <span class="hlt">Al</span>3+ poison for these <span class="hlt">Al</span>3+ tolerant strains. Furthermore, <span class="hlt">Al</span>3+ stress could stimulate the ECM fungi to assimilate more N, P, and K, which might indicate that increasing requirement of the nutrients also could be helpful for ECM fungi to fight against the harmful effects caused by <span class="hlt">Al</span>3+ stress. PMID:26717713</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/39889','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/39889"><span id="translatedtitle">Elevated temperature wear of <span class="hlt">Al</span>6061 and <span class="hlt">Al</span>6061-20%<span class="hlt">Al</span>{sub 2}O{sub 3}</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Singh, J.; Alpas, A.T.</p> <p>1995-04-01</p> <p>Both current and potential applications of particulate reinforced aluminum alloys involve components which are required to operate under sliding contact conditions at elevated temperatures. Examples include brake rotors, piston and cylinder liners in automotive engines where operating temperatures can reach 0.5--0.8 of the melting temperature of the matrix alloy. For this reason, study of the high temperature wear resistance of aluminum alloys reinforced by <span class="hlt">Al</span>{sub 2}O{sub 3} or SiC particles is important. These studies are also of interest for the problem of die wear during hot extrusion of aluminum matrix composites and to rationalize the process of frictional welding involved in joining of the composites. Although the room temperature tribological and mechanical behaviors of aluminum matrix composites have received considerable attention, their high temperature properties have only recently started being considered. It has been shown that <span class="hlt">Al</span>-Si-Mg (A356) alloys with or without SiC particles show a transition from mild to severe wear when a critical temperature (at about 0.4 T{sub m}, where T{sub m} is the melting temperature of aluminum) is reached as a result of frictional heating under dry sliding conditions. In this work, high temperature wear of A16061 and A16061-20%<span class="hlt">Al</span>{sub 2}O{sub 3} was studied at temperatures between 25--500 C. The microstructural changes that occurred during wear have been delineated in order to understand the wear mechanisms that operate at high temperatures.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_14 --> <div id="page_15" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="281"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/21694214','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/21694214"><span id="translatedtitle">Thermodynamic properties of <span class="hlt">Al</span>-Mn, <span class="hlt">Al</span>-Cu, and <span class="hlt">Al</span>-Fe-Cu melts and their relations to liquid and quasicrystal structure.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zaitsev, A I; Zaitseva, N E; Shimko, R Yu; Arutyunyan, N A; Dunaev, S F; Kraposhin, V S; Lam, Ha Thanh</p> <p>2008-03-19</p> <p>Thermodynamic properties of molten <span class="hlt">Al</span>-Mn, <span class="hlt">Al</span>-Cu and <span class="hlt">Al</span>-Fe-Cu alloys in a wide temperature range of 1123-1878 K and the whole range of concentrations have been studied using the integral effusion method and Knudsen mass spectrometry. Thermodynamic functions of melts were described by the associated solution model. The possibility of icosahedral quasicrystal (i-QC) precipitation from liquid <span class="hlt">Al</span>-Mn and <span class="hlt">Al</span>-Cu-Fe alloys was found to be a consequence of the existence in liquid associates (clusters). A geometric model is suggested for the structure of associates in liquid. PMID:21694214</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009SPIE.7216E..21H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009SPIE.7216E..21H"><span id="translatedtitle">222-282 nm <span class="hlt">Al</span>GaN and In<span class="hlt">Al</span>GaN based deep-UV LEDs fabricated on high-quality <span class="hlt">Al</span>N template</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hirayama, Hideki; Noguchi, Norimichi; Fujikawa, Sachie; Norimatsu, Jun; Kamata, Norihiko; Takano, Takayoshi; Tsubaki, Kenji</p> <p>2009-02-01</p> <p>We demonstrate 222-282 nm <span class="hlt">Al</span>GaN and In<span class="hlt">Al</span>GaN-based deep ultraviolet (DUV) light-emitting diodes (LEDs) fabricated on low threading dislocation density (TDD) <span class="hlt">Al</span>N template. Low TDD <span class="hlt">Al</span>N templates were realized by using ammonia (NH3) pulse-flow multilayer (ML) growth technique. The edge- and screw-type dislocation densities of <span class="hlt">Al</span>N layer were reduced to 7.5×108 and 3.8×107, respectively. We obtained significant increase of an <span class="hlt">Al</span>GaN quantum well (QW) emission (by more than 50 times) by fabricating them on a low TDD ML-<span class="hlt">Al</span>N template. We fabricated <span class="hlt">Al</span>GaN multi (M)QW DUV-LEDs with emission range of 222-273 nm on ML-<span class="hlt">Al</span>N templates. Single-peaked electroluminescence (EL) was obtained for <span class="hlt">Al</span>GaN DUV-LEDs. We obtained the maximum output power of 1.1, 2.4 and 3.3 mW for the <span class="hlt">Al</span>GaN LEDs with wavelengths of 241, 253 and 273 nm, respectively, under RT CW operation. The maximum output power of 227 and 222 nm <span class="hlt">Al</span>GaN-QW were 0.15mW and 0.014mW, respectively, under RT pulsed operation. The maximum external quantum efficiency (EQE) of the 227 and 250 nm <span class="hlt">Al</span>GaN LEDs were 0.2% and 0.43 %, respectively. We also fabricated 280 nm-band quaternary In<span class="hlt">Al</span>GaN-MQW DUV-LEDs with p-type In<span class="hlt">Al</span>GaN layers on low TDD ML-<span class="hlt">Al</span>N templates. We obtained significant increase of photoluminescence (PL) intensity by introducing Si-doped In<span class="hlt">Al</span>GaN buffer and barrier layers and undoped In<span class="hlt">Al</span>GaN interlayer. We then demonstrated high internal quantum efficiency (IQE) of 284 nm In<span class="hlt">Al</span>GaN-QW emission, which was confirmed by the fact that the ratio of the integrated intensity of the RT-PL against the 77K-PL was 86%. The maximum output power and EQE of the 282 nm In<span class="hlt">Al</span>GaN LED were 10.6 mW and 1.2%, respectively, under RT CW operation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20070021778','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20070021778"><span id="translatedtitle">Solidification Behavior of gamma'-Ni3<span class="hlt">Al</span> Containing Alloys in the Ni-<span class="hlt">Al</span>-O System</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Copland, Evan</p> <p>2007-01-01</p> <p>The chemical activities of <span class="hlt">Al</span> and Ni in gamma(prime)-Ni3<span class="hlt">Al</span>-containing systems were measured using the multi-cell Knudsen effusion-cell mass spectrometry technique (multi-cell KEMS), over the composition range 8 - 32 at.%<span class="hlt">Al</span> and temperature range T = 1400 - 1750 K. From these measurements a better understanding of the equilibrium solidification behaviour of gamma(prime)-Ni3<span class="hlt">Al</span>-containing alloys in the Ni-<span class="hlt">Al</span>-O system was established. Specifically, these measurements revealed that (1) gamma(prime)-Ni3<span class="hlt">Al</span> forms via the peritectiod reaction, gamma + Beta (+ A12O3) = gamma (prime) (+ <span class="hlt">Al</span>2O3), at 1633 +/- 1 K, (2) the {gamma + Beta + <span class="hlt">Al</span>2O3} phase field is stable over the temperature range 1633 through 1640 K, and (3) equilibrium solidification occurs by the eutectic reaction, L (+ <span class="hlt">Al</span>2O3) = gamma + Beta (+ <span class="hlt">Al</span>2O3), at 1640 +/- 1 K and a liquid composition of 24.8 +/- 0.2 at.%<span class="hlt">Al</span> (at an unknown oxygen content). When projected onto the Ni-<span class="hlt">Al</span> binary, this behaviour is inconsistent with the current Ni-<span class="hlt">Al</span> phase diagram and a new diagram is proposed. This new Ni-<span class="hlt">Al</span> phase diagram explains a number of unusual steady-state solidification structures reported previously and provides a much simpler reaction scheme in the vicinity of the gamma(prime)-Ni3<span class="hlt">Al</span> phase field.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JPhCS.665a2018B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JPhCS.665a2018B"><span id="translatedtitle">Study of the 26<span class="hlt">Al</span>(n,p)26Mg and 26<span class="hlt">Al</span>(n,α)23Na reactions using the 27<span class="hlt">Al</span>(p,p')27<span class="hlt">Al</span> inelastic scattering reaction</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Benamara, S.; de Séréville, N.; Adsley, P.; Laird, A. M.; Hammache, F.; Stefan, I.; Roussel, P.; Ancelin, S.; Assié, M.; Barton, C.; Coc, A.; Diget, C.; Deloncle, I.; Fox, S.; Guillot, J.; Hamadache, C.; Kiener, J.; Le Crom, B.; Lefebvre, L.; Lefebfre-Schuhl, A.; Marquinez Duran, G.; Mavilla, G.; Morfouace, P.; Mutschler, A.; Nsangu, C. T.; Perrot, L.; Oulebsir, N.; Sánchez-Benítez, Á.-M.; Suzuki, D.; Tatischeff, V.; Vandebrouck, M.</p> <p>2016-01-01</p> <p>26<span class="hlt">Al</span> was the first cosmic radioactivity ever detected in the galaxy as well as one of the first extinct radioactivity observed in refractory phases of meteorites. Its nucleosynthesis in massive stars is still uncertain mainly due to the lack of nuclear information concerning the 26<span class="hlt">Al</span>(n,p)26Mg and 26 <span class="hlt">Al</span>(n,α)23Na reactions. We report on a single and coincidence measurement of the 27<span class="hlt">Al</span>(p,p')27<span class="hlt">Al</span>(p)26Mg and 27<span class="hlt">Al</span>(p,p')27<span class="hlt">Al</span>(α)23Na reactions performed at the Orsay TANDEM facility aiming at the spectroscopy study of 27<span class="hlt">Al</span> above the neutron threshold. Fourteen states are observed for the first time within 350 keV above the 26<span class="hlt">Al</span>+n threshold.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20010060374','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20010060374"><span id="translatedtitle">Creep and Toughness of Cryomilled Ni<span class="hlt">Al</span> Containing Cr</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Whittenberger, J. Daniel; Aikin, Beverly; Salem, Jon</p> <p>2000-01-01</p> <p>Ni<span class="hlt">Al-Al</span>N + Cr composites were produced by blending cryomilled Ni<span class="hlt">Al</span> powder with approx. 10 vol % Cr flakes. In comparison to the as-consolidated matrices, hot isostatically pressed Cr-modified materials did not demonstrate any significant improvement in toughness. Hot extruded Ni<span class="hlt">Al-Al</span>N+10.5Cr, however, possessed a toughness twice that determine for the base Ni<span class="hlt">Al-Al</span>N alloy. Measurement of the 1200 to 1400 K plastic flow properties revealed that the strength of the composites was completely controlled by the properties of the Ni<span class="hlt">Al-Al</span>N matrices. This behavior could be successfully modeled by the Rule-of-Mixtures, where load is shed from the weak Cr to the strong matrix.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19890005862','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19890005862"><span id="translatedtitle">The oxidation of Ni-rich Ni-<span class="hlt">Al</span> intermetallics</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Doychak, Joseph; Smialek, James L.; Barrett, Charles A.</p> <p>1988-01-01</p> <p>The oxidation of Ni-<span class="hlt">Al</span> intermetallic alloys in the beta-Ni<span class="hlt">Al</span> phase field and in the two phase beta-Ni<span class="hlt">Al</span>/gamma'-Ni3<span class="hlt">Al</span> phase field has been studied between 1000 and 1400 C. The stoichiometric beta-Ni<span class="hlt">Al</span> alloy doped with Zr was superior to other alloy compositions under cyclic and isothermal oxidation. The isothermal growth rates did not increase monotonically as the alloy <span class="hlt">Al</span> content was decreased. The characteristically ridged alpha-<span class="hlt">Al</span>2O3 scale morphology, consisting of cells of thin, textured oxide with thick growth ridges at cell boundaries, forms on oxidized beta-Ni<span class="hlt">Al</span> alloys. The correlation of scale features with isothermal growth rates indicates a predominant grain boundary diffusion growth mechanism. The 1200 C cyclic oxidation resistance decreases near the lower end of the beta-Ni<span class="hlt">Al</span> phase field.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JMEP...22.2098S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JMEP...22.2098S"><span id="translatedtitle">The Nature of Interfaces in <span class="hlt">Al</span>-1050/<span class="hlt">Al</span>-1050 and <span class="hlt">Al</span>-1050/Mg-AZ31 Couples Joined by Magnetic Pulse Welding (MPW)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Stern, A.; Aizenshtein, M.; Moshe, G.; Cohen, S. R.; Frage, N.</p> <p>2013-07-01</p> <p>The microstructure and the phase composition of the interfaces of <span class="hlt">Al</span>-1050/<span class="hlt">Al</span>-1050 and <span class="hlt">Al</span>-1050/Mg-AZ31 magnetic pulse welding (MPW) joints were characterized by SEM and TEM analyses. The mechanical properties were tested by nanoindentation. Properties of the <span class="hlt">Al</span>-1050/<span class="hlt">Al</span>-1050 interface joint were established. The interface is almost free from <span class="hlt">Al</span>3Fe precipitates, which are present in the base metal. The hardness value is higher than that of the base metal; however, values of the Young's modulus of the interface and base metal are similar. It was suggested that the interface evolution in the <span class="hlt">Al</span>-1050/<span class="hlt">Al</span>-1050 system includes local melting and rapid solidification of the base materials. A wavy shaped heterogeneous interface was detected in the <span class="hlt">Al</span>-1050/Mg-AZ31 joints. Some areas are free from visible intermetallic phases (IMPs), while others contain pockets of relatively coarse intermetallic precipitates. The presence of a relatively large fraction of globular porosity at the interface indicates that local melting takes place in the course of MPW. TEM characterization of regions free of IMPs at the interface reveals regions consisting of fcc supersaturated <span class="hlt">Al</span>-Mg solid solution, apparently formed as a result of local mechanical alloying during MPW. In other regions, the composition and structure correspond to the Mg17<span class="hlt">Al</span>12 phase, which was probably formed by local melting and rapid solidification.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010ChPhL..27c7102D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010ChPhL..27c7102D"><span id="translatedtitle">Effects of <span class="hlt">Al</span>N and <span class="hlt">Al</span>GaN Interlayer on Properties of In<span class="hlt">Al</span>N/GaN Heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Dong, Xun; Li, Zhong-Hui; Li, Zhe-Yang; Zhou, Jian-Jun; Li, Liang; Li, Yun; Zhang, Lan; Xu, Xiao-Jun; Xu, Xuan; Han, Chun-Lin</p> <p>2010-03-01</p> <p>In<span class="hlt">Al</span>N/GaN heterojunction structures are grown on two-inch c-face(0001) sapphire substrates by metalorganic chemical vapour deposition. <span class="hlt">Al</span>N and <span class="hlt">Al</span>GaN interlayers are intentionally inserted into the structure to improve the electrical properties. The lowest sheet resistance of 359?/sq and the highest room-temperature two-dimensional electron gas (2DEG) mobility of 1051 cm2 V-1s-1 is obtained in the structure with <span class="hlt">Al</span>N thickness of 1.3 nm. The structure with <span class="hlt">Al</span>N thickness of 2 nm exhibits the highest 2DEG concentration of 1.84 × 1013 cm-2. The sample with an <span class="hlt">Al</span>GaN interlayer gives a smoother surface morphology compared to the one using an <span class="hlt">Al</span>N interlayer, indicating potential applications of this technique in device fabrication.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2001PhRvA..64e3202Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2001PhRvA..64e3202Z"><span id="translatedtitle">Conformers of <span class="hlt">Al</span>13, <span class="hlt">Al</span>12M, and <span class="hlt">Al</span>13M (M=Cu, Ag, and Au) clusters and their energetics</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zope, Rajendra R.; Baruah, Tunna</p> <p>2001-11-01</p> <p>The candidate structures for the ground-state geometry of the <span class="hlt">Al</span>13, <span class="hlt">Al</span>12M, and <span class="hlt">Al</span>13M (M=Cu, Ag, and Au) clusters are obtained within the spin-polarized density-functional theory with a three-parameter hybrid functional to describe the exchange-correlation effects. Binding energy, vertical ionization potential, vertical electron affinity, and the energy gap between the highest-occupied molecular-orbital level and the lowest-unoccupied molecular-orbital level have been calculated to investigate the stability of these clusters. These results are compared with those of the alkali doped <span class="hlt">Al</span>12 and <span class="hlt">Al</span>13 clusters. The adatom energies (defined as the energy gained upon adding the atom to the host <span class="hlt">Al</span>13 clusters) are found to be substantially larger for the coinage metal atom than those for alkali and <span class="hlt">Al</span> atoms. The natural population analysis was carried out to get a qualitative picture of the bonding in these clusters.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016ApSS..361...90W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016ApSS..361...90W"><span id="translatedtitle">A novel Ti<span class="hlt">Al</span>3/<span class="hlt">Al</span>2O3 composite coating on γ-Ti<span class="hlt">Al</span> alloy and evaluating the oxidation performance</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, Jiqiang; Kong, Lingyan; Li, Tiefan; Xiong, Tianying</p> <p>2016-01-01</p> <p>A novel Ti<span class="hlt">Al</span>3/<span class="hlt">Al</span>2O3 composite coating was prepared on γ-Ti<span class="hlt">Al</span> alloy. The process included two steps: (1) Ti<span class="hlt">Al</span>3/<span class="hlt">Al</span>2O3 composite powders were prepared by high energy ball milling of pure <span class="hlt">Al</span> and nano-TiO2 powders, followed by a heat-treatment; (2) the as-prepared composite powders were deposited on γ-Ti<span class="hlt">Al</span> substrate by cold spray. The cyclic oxidation was conducted at 900 °C to test the performance of the composite coating. The results showed that the composite coating had good crack resistance and effectively decreased the oxidation rate of the substrate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20634400','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20634400"><span id="translatedtitle">Short-period superlattices of <span class="hlt">AlN/Al</span>{sub 0.08}Ga{sub 0.92}N grown on <span class="hlt">Al</span>N substrates</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Nikishin, S.A.; Borisov, B.A.; Chandolu, A.; Kuryatkov, V.V.; Temkin, H.; Holtz, M.; Mokhov, E.N.; Makarov, Yu.; Helava, H.</p> <p>2004-11-08</p> <p>High-quality short-period superlattices of <span class="hlt">AlN/Al</span>{sub 0.08}Ga{sub 0.92}N have been grown by gas-source molecular-beam epitaxy with ammonia on <span class="hlt">Al</span> face of <span class="hlt">Al</span>N (0001) substrates. A significant reduction was achieved in the dislocation density, down to 3x10{sup 8} cm{sup -2}. Complete removal of residual <span class="hlt">Al</span>{sub 2}O{sub 3} surface oxide is needed in order to obtain low dislocation density in homoepitaxy on <span class="hlt">Al</span>N. We show that the presence of <span class="hlt">Al</span>{sub 2}O{sub 3} islands with the surface coverage as low as 0.2% results in increased dislocation density.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1048512','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1048512"><span id="translatedtitle"><span class="hlt">Al</span>-Ca and <span class="hlt">Al</span>-Fe metal-metal composite strength, conductivity, and microstructure relationships</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kim, Hyong June</p> <p>2011-12-01</p> <p>Deformation processed metal-metal composites (DMMC’s) are composites formed by mechanical working (i.e., rolling, swaging, or wire drawing) of two-phase, ductile metal mixtures. Since both the matrix and reinforcing phase are ductile metals, the composites can be heavily deformed to reduce the thickness and spacing of the two phases. Recent studies have shown that heavily drawn DMMCs can achieve anomalously high strength and outstanding combinations of strength and conductivity. In this study, <span class="hlt">Al</span>-Fe wire composite with 0.07, 0.1, and 0.2 volume fractions of Fe filaments and <span class="hlt">Al</span>-Ca wire composite with 0.03, 0.06, and 0.09 volume fractions of Ca filaments were produced in situ, and their mechanical properties were measured as a function of deformation true strain. The <span class="hlt">Al</span>-Fe composites displayed limited deformation of the Fe phase even at high true strains, resulting in little strengthening effect in those composites. <span class="hlt">Al</span>-9vol%Ca wire was deformed to a deformation true strain of 13.76. The resulting Ca second-phase filaments were deformed to thicknesses on the order of one micrometer. The ultimate tensile strength increased exponentially with increasing deformation true strain, reaching a value of 197 MPa at a true strain of 13.76. This value is 2.5 times higher than the value predicted by the rule of mixtures. A quantitative relationship between UTS and deformation true strain was determined. X-ray diffraction data on transformation of <span class="hlt">Al</span> + Ca microstructures to <span class="hlt">Al</span> + various <span class="hlt">Al</span>-Ca intermetallic compounds were obtained at the Advanced Photon Source at Argonne National Laboratory. Electrical conductivity was measured over a range of true strains and post-deformation heat treatment schedules.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19910059170&hterms=Groh&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAuthor-Name%26N%3D0%26No%3D30%26Ntt%3DGroh','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19910059170&hterms=Groh&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAuthor-Name%26N%3D0%26No%3D30%26Ntt%3DGroh"><span id="translatedtitle">Intermediate temperature thermomechanical processing of <span class="hlt">Al</span> 2090 for superplasticity</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hales, S. J.; Mcnelley, T. R.; Groh, G. E.</p> <p>1989-01-01</p> <p>The <span class="hlt">Al</span>-Cu-Li phase diagram indicates that during thermomechanical processing of <span class="hlt">Al</span> 2090 at 300 C both T(1) and T(2) phases will precipitate. Following work on <span class="hlt">Al</span>-Mg-X alloys, it is possible that TMP at such temperatures might promote intragranular formation of these phases and promote microstructural refinement during recrystallization. Microstructural analyses reveal that the T(2) phase in <span class="hlt">Al</span> 2090 may play a similar role to the beta-phase in <span class="hlt">Al</span>-Mg-X alloys during microstructural evolution. Mechanical property data indicate that <span class="hlt">Al</span> 2090 can be moderately (215-245 percent) superplastic at 370 C following processing at 300 C.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014RMxAC..44Q.167S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014RMxAC..44Q.167S"><span id="translatedtitle"><span class="hlt">ALS</span> 2883: Analysis of spectroscopic features</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Silva, A. R.; Levenhagen, R. S.; Künzel, R.; Leister, N. V.</p> <p>2014-10-01</p> <p><span class="hlt">ALS</span> 2883 (RA 13^{h} 02^{m} 47^{s}, DEC -63^{o} 50' 08'', M_{v} 10.1) is the first known radio pulsar with an emission B-type companion system, discovered in 1992. The Be companion of <span class="hlt">ALS</span> 2883 has all line profiles in the visible range in emission. This emission is a common hallmark among many Be stars, and this effect is thought to be due to the presence of a circumstellar environment. Also, the star is orbiting a X-ray source as has been detected by the XMM-Newton Science Operation Center. In this study, we present the observations of <span class="hlt">ALS</span> 2883 made at the OPD/LNA 1.60 m telescope with the Coudé spectrograph in the range 4000 to 5000 Å and S/N simeq 200, performed in April 2011. First-order estimations of T_{eff} and log g parameters have been performed through Johnson's UBV and JHK photometric calibrations. Projected rotation velocity V sin i has been estimated through the mean of the first zeroes of the Fourier transforms of neutral helium rotation profiles adopting linear, quadratic and square-root limb-darkening laws. The physical conditions of the circumstellar envelope were estimated through the solution of the radiative transport equation assuming local thermodynamic equilibrium within a disk-shaped circumstellar environment with a Keplerian velocity field. The radiative transport equation is solved assuming the Roche model as a boundary condition in the circumstellar environment. Iterating the computations with a downhill-simplex algorithm, this analysis leads to a best solution for an envelope with T simeq 9500 K, gas density ? simeq 2 × 10^{-15} g.cm^{-3}, internal radius r_{i} simeq 8 R_{odot} and external radius r_e simeq 30 R_{odot}, rotating with V_{rot} simeq 140 km.s^{-1} and expanding with V_{exp} simeq 90 km.s^{-1}.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24972820','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24972820"><span id="translatedtitle">Delayed diagnosis in <span class="hlt">ALS</span>: the problem continues.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Nzwalo, Hipolito; de Abreu, Daisy; Swash, Michael; Pinto, Susana; de Carvalho, Mamede</p> <p>2014-08-15</p> <p>We studied the limitations to early diagnosis in amyotrophic lateral sclerosis (<span class="hlt">ALS</span>). The diagnostic process was assessed in 120 consecutive patients, including onset, interval to diagnosis, investigations, specialist assessment and pre-diagnostic management. Times from onset to first consultation (T1), second consultation (T2) and diagnosis (TD) were considered. Predictors of diagnostic delay were determined by multivariate logistic regression, adjusted for gender, age, clinical manifestations, and specialism of the first and second consultants. There were 101 consecutive <span class="hlt">ALS</span> patients with complete datasets (69% men; median age at diagnosis 61.5 years). The mean TD and median TD were respectively 10.1 and 9.5 months. In 55%, the first consultant was a general practitioner (GP), in 16% a neurologist and in 14% an orthopedist. The diagnosis of <span class="hlt">ALS</span> was made by non-neurologists in 9 patients. The odds of delayed diagnosis (≥ 12 months) were higher (1.56; 0.19-12.56) in younger patients (≤ 45 years) (p<0.05). Female gender (0.56; 0.29-1.70) and bulbar-onset (0.56; 0.29-1.70) were independently associated with earlier diagnosis (p<0.05). Assessment by a neurologist at the first (0.32; 0.19-2.46) or second consultation (0.87; 0.21-1.21) was associated with a shorter diagnosis time (< 12 months) (p<0.05). We conclude that diagnostic delay mainly resulted from delayed referral from non-neurologist physicians to a neurologist. Moreover, incomplete neurophysiological investigation had a relevant impact. PMID:24972820</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JAP...114f3712I','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JAP...114f3712I"><span id="translatedtitle">Hf dopants in ?'-Ni3<span class="hlt">Al</span> alloy</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ivanovski, V. N.; Ceki?, B.; Umi?evi?, A.; Beloševi?-?avor, J.; Schumacher, G.; Koteski, V.; Barudzija, T.</p> <p>2013-08-01</p> <p>The Time Differential Perturbed Angular (TDPAC) measurements of nuclear quadrupole interactions (NQIs) at 181Ta ion probe in the polycrystalline intermetallic alloy ?'-Ni3<span class="hlt">Al</span> doped with 0.2 at. % Hf were performed in the temperature range 78-1230 K, in order to determine the lattice location of Hf atoms in the ordered ?'-Ni3<span class="hlt">Al</span> structure. The two NQIs obtained are discussed within the present L12 cubic structure and a tetragonal distortion of L12 to another two DO22 and L60 type structures. The first low frequency NQI at the site of the 181Ta ion-probe after substitution of aluminum for hafnium in DO22 at ambient temperature, is vQ1(300 K) = 39(1) MHz with ?1 = 0. The corresponding high frequency value on the second crystallographic site in L60, is vQ2(300 K) = 204(14) MHz with ?2 = 0.47(11). These two NQI's have different temperature behavior. The presence of both DO22 and L60 tetragonal distortions of the parent cubic L12 lattice, detected after adding 0.2 at. % Hf, are with modulations to the lattice constant (a) with a ratio (c/a), 2.04 and 0.87, respectively. Ab initio calculations of electronic and structural properties and hyperfine parameters at the 181Ta ion probe of the ?'-Ni3<span class="hlt">Al</span>-0.2 at. % Hf alloy were performed using the full potential augmented plane wave plus local-orbital (APW+lo) method as implemented in the WIEN2k code. The accuracy of the calculations and comparison with the experimental results enabled us to identify the observed hyperfine interactions and to infer the EFG sign that cannot be measured in conventional TDPAC measurements.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/953776','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/953776"><span id="translatedtitle">Influence of Reaction with XeF2 on Surface Adhesion of <span class="hlt">Al</span> and <span class="hlt">Al</span>2O3 Surfaces</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zhang, Tianfu; Park, Jeong Y.; Huang, Wenyu; Somorjai, Gabor A.</p> <p>2008-07-28</p> <p>The change of surface adhesion after fluorination of <span class="hlt">Al</span> and <span class="hlt">Al</span>{sub 2}O{sub 3} surfaces using XeF{sub 2} was investigated with atomic force microscopy. The chemical interaction between XeF{sub 2} and <span class="hlt">Al</span> and <span class="hlt">Al</span>{sub 2}O{sub 3} surfaces was studied by in situ x-ray photoelectron spectroscopy. Fresh <span class="hlt">Al</span> and <span class="hlt">Al</span>{sub 2}O{sub 3} surfaces were obtained by etching top silicon layers of Si/<span class="hlt">Al</span> and Si/<span class="hlt">Al</span>{sub 2}O{sub 3} with XeF{sub 2}. The surface adhesion and chemical composition were measured as a function of time after the exposure to air or annealing (at 200 C under vauum). The correlation between the adhesion force increase and presence of <span class="hlt">Al</span>F{sub 3} on the surface was revealed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012JPSJ...81b3703O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012JPSJ...81b3703O"><span id="translatedtitle">Superconductivity in the Einstein Solid AxV2<span class="hlt">Al</span>20 (A= <span class="hlt">Al</span> and Ga)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Onosaka, Atsushi; Okamoto, Yoshihiko; Yamaura, Jun-ichi; Hiroi, Zenji</p> <p>2012-02-01</p> <p>A cage compound of the form AxV2<span class="hlt">Al</span>20 (<span class="hlt">Al</span>10V), which was called an Einstein solid by Caplin and coworkers 40 years ago, is revisited to investigate the low-energy, local vibrations of the A atoms and their effects on the electronic and superconducting properties of the compound. Polycrystalline samples with A= <span class="hlt">Al</span>, Ga, Y, and La are studied through resistivity and heat capacity measurements. Weak-coupling BCS superconductivity is observed below Tc = 1.49, 1.66, and 0.69 K for Ax= <span class="hlt">Al</span>0.3, Ga0.2, and Y, respectively, but not above 0.4 K for Ax= La. Low-energy modes are detected only for A= <span class="hlt">Al</span> and Ga, which are approximately described by the Einstein model with Einstein temperatures of 24 and 8 K, respectively. A weak but significant coupling between the low-energy modes, which are almost identical to those called rattling in a recent study, and conduction electrons manifests itself as anomalous enhancement in resistivity at low temperatures approximately corresponding to the Einstein temperatures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3967201','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3967201"><span id="translatedtitle">Revisiting the <span class="hlt">Al/Al</span>2O3 Interface: Coherent Interfaces and Misfit Accommodation</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Pilania, Ghanshyam; Thijsse, Barend J.; Hoagland, Richard G.; Lazi?, Ivan; Valone, Steven M.; Liu, Xiang-Yang</p> <p>2014-01-01</p> <p>We study the coherent and semi-coherent <span class="hlt">Al/?-Al</span>2O3 interfaces using molecular dynamics simulations with a mixed, metallic-ionic atomistic model. For the coherent interfaces, both <span class="hlt">Al</span>-terminated and O-terminated nonstoichiometric interfaces have been studied and their relative stability has been established. To understand the misfit accommodation at the semi-coherent interface, a 1-dimensional (1D) misfit dislocation model and a 2-dimensional (2D) dislocation network model have been studied. For the latter case, our analysis reveals an interface dislocation structure with a network of three sets of parallel dislocations, each with pure-edge character, giving rise to a pattern of coherent and stacking-fault-like regions at the interface. Structural relaxation at elevated temperatures leads to a further change of the dislocation pattern, which can be understood in terms of a competition between the stacking fault energy and the dislocation interaction energy at the interface. Our results are expected to serve as an input for the subsequent dislocation dynamics models to understand and predict the macroscopic mechanical behavior of <span class="hlt">Al/?-Al</span>2O3 composite heterostructures. PMID:24670940</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JMiMi..25h7002B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JMiMi..25h7002B"><span id="translatedtitle">Deep SiO2 etching with <span class="hlt">Al</span> and <span class="hlt">Al</span>N masks for MEMS devices</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bliznetsov, Vladimir; Mao Lin, Hua; Zhang, Yue Jia; Johnson, David</p> <p>2015-08-01</p> <p>Silicon oxide-based materials such as quartz and silica are widely used in microelectromechanical systems (MEMS). One way to enhance the capability of their deep plasma etching is to increase selectivity by the use of hard masks. Although this approach was studied previously, information on the use of hard masks for the etching of silicon-oxide based materials on 200?mm substrates is scarce. We present the results of etching process development for amorphous silicon oxide using <span class="hlt">Al</span> and <span class="hlt">Al</span>N masks with a view of the application of the results for the etching of silica and quartz. Three gas chemistries (C4F8/O2, CF4 and SF6) and their mixtures were compared in an industrial reactive ion etch (RIE) chamber with two plasma sources. It was established that pure SF6 is the best etchant and <span class="hlt">Al</span>N is a better mask than <span class="hlt">Al</span> for providing higher selectivity and a sidewall angle close to vertical. A range of etching parameters for micromasking-free etching was established and etched structures of up to a 4?:?1 aspect ratio were created in 21??m-thick oxide using the process with an etch rate of 0.32-0.36??m?min-1 and a selectivity to <span class="hlt">Al</span>N mask of (38-49) : 1.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_15 --> <div id="page_16" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="301"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JAP...117u4904G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JAP...117u4904G"><span id="translatedtitle">Simulations of nanoscale Ni/<span class="hlt">Al</span> multilayer foils with intermediate Ni2<span class="hlt">Al</span>3 growth</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gunduz, I. E.; Onel, S.; Doumanidis, C. C.; Rebholz, C.; Son, S. F.</p> <p>2015-06-01</p> <p>Nanoscale multilayers of binary metallic systems, such as nickel/aluminum, exhibit self-propagating exothermic reactions due to the high formation enthalpy of the intermetallic compounds. Most of the previous modeling approaches on the reactions of this system rely on the use of mass diffusion with a phenomenological derived diffusion coefficient representing single-phase (Ni<span class="hlt">Al</span>) growth, coupled with heat transport. We show that the reaction kinetics, temperatures, and thermal front width can be reproduced more satisfactorily with the sequential growth of Ni2<span class="hlt">Al</span>3 followed by Ni<span class="hlt">Al</span>, utilizing independently obtained interdiffusivities. The computational domain was meshed with a dynamically generated bi-modal grid consisting of fine and coarse zones corresponding to rapid and slower reacting regions to improve computational efficiency. The PDEPE function in MATLAB was used as a basis for an alternating direction scheme. A modified parabolic growth law was employed to model intermetallic growth in the thickness direction. A multiphase enthalpy function was formulated to solve for temperatures after discrete phase growth and transformations at each time step. The results show that the Ni2<span class="hlt">Al</span>3 formation yields a preheating zone to facilitate the slower growth of Ni<span class="hlt">Al</span>. At bilayer thicknesses lower than 12 nm, the intermixing layer induces oscillating thermal fronts, sharply reducing the average velocities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JKPS...65.1101Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JKPS...65.1101Z"><span id="translatedtitle">Properties of an <span class="hlt">AlGaN/Al</span>N distributed-Bragg-reflector structure</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Li-Li; Liu, Zhan-Hui; Huang, Xiao-Gu; Li, Qing-Fang; Zhang, Rong; Xie, Zi-Li; Xiu, Xiang-Qian</p> <p>2014-10-01</p> <p>An <span class="hlt">AlGaN/Al</span>N distributed-Bragg-reflector (DBR) structure with a high <span class="hlt">Al</span> content was grown by using plasma-assisted molecular beam epitaxy (PA-MBE). The properties of the sample were characterized by using the transmission electron microscopy, high-resolution X-ray diffraction, atomic force microscopy, and reflectivity spectrum measurements. The reciprocal space mapping analysis indicated that the strain in the <span class="hlt">Al</span>GaN layers was partially relaxed. The morphology of the DBR exhibited a surface covered by grains (average size of about 130 nm), and the surface roughness was about 2 nm. The spectral measurements showed that the DBR structure presented a peak reflectivity of 68.8% at the center wavelength of 247 nm, which indicated that this DBR structure could work in the deep solar-blind UV region with acceptable reflectivity. However, the optical properties of the DBR structure were deteriorated by the fluctuation of the <span class="hlt">Al</span> composition, non-uniformity of the layer thickness, the blurry, rough interface in the DBR structure, and so on.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/5740247','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/5740247"><span id="translatedtitle"><span class="hlt">ALS</span> insertion device block measurement and inspection</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Marks, S.; Carrieri, J.; Cook, C.; Hassenzahl, W.V.; Hoyer, E.; Plate, D.</p> <p>1991-05-01</p> <p>The performance specifications for <span class="hlt">ALS</span> insertion devices require detailed knowledge and strict control of the Nd-Fe-B permanent magnet blocks incorporated in these devices. This paper describes the measurement and inspection apparatus and the procedures designed to qualify and characterize these blocks. A detailed description of a new, automated Helmholtz coil facility for measurement of the three components of magnetic moment is included. Physical block inspection and magnetic moment measurement procedures are described. Together they provide a basis for qualifying blocks and for specifying placement of blocks within an insertion devices' magnetic structures. 1 ref., 4 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/495821','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/495821"><span id="translatedtitle">Orbit stability of the <span class="hlt">ALS</span> storage ring</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Keller, R.; Nishimura, H.; Biocca, A.</p> <p>1997-05-01</p> <p>The Advanced Light Source (<span class="hlt">ALS</span>) storage ring, a synchrotron light source of the third generation, is specified to maintain its electron orbit stable within one tenth of the rms beam size. In the absence of a dedicated orbit feed-back system, several orbit-distorting effects were investigated, aided by a new interactive simulation tool, the code TRACY V. The effort has led to a better understanding of the behavior of a variety of accelerator subsystems and in consequence produced a substantial improvement in day-to-day orbit stability.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19780013346','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19780013346"><span id="translatedtitle">Development of Si<span class="hlt">Al</span>ON materials</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Layden, G. K.</p> <p>1977-01-01</p> <p>Cold pressing and sintering techniques were used to produce ceramic bodies in which the major phase was beta prime Si3-<span class="hlt">Al</span>-O-N4 solid solution. A variety of foreign oxides were used to promote liquid phase sintering, and this resulted in the incorporation of additional solid phases in the ceramic bodies which controlled elevated temperature properties. None of the bodies studied to date exhibited both adequate high temperature mechanical properties and oxidation resistance. Criteria are suggested to guide the formulation of bodies with improved high temperature properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009JNuM..395..162K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009JNuM..395..162K"><span id="translatedtitle">Interdiffusion between U(Mo,Pt) or U(Mo,Zr) and <span class="hlt">Al</span> or <span class="hlt">Al</span> A356 alloy</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Komar Varela, C.; Mirandou, M.; Aricó, S.; Balart, S.; Gribaudo, L.</p> <p>2009-12-01</p> <p>Solid state reactions in chemical diffusion couples U-7 wt.%Mo-0.9 wt.%Pt/<span class="hlt">Al</span> at 580 °C and U-7 wt.%Mo-0.9 wt.%Pt/<span class="hlt">Al</span> A356 alloy, U-7 wt.%Mo-1 wt.%Zr/<span class="hlt">Al</span> and U-7 wt.%Mo-1 wt.%Zr/<span class="hlt">Al</span> A356 alloy at 550 °C were characterized. Results were obtained from optical and scanning electron microscopy, electron probe microanalysis and X-ray diffraction. The UAl 3, UAl 4 and <span class="hlt">Al</span> 20Mo 2U phases were identified in the interaction layers of γU(Mo,Pt)/<span class="hlt">Al</span> and γU(Mo,Zr)/<span class="hlt">Al</span> diffusion couples. <span class="hlt">Al</span> 43Mo 4U 6 ternary compound was also identified in γU(Mo,Zr)/<span class="hlt">Al</span> due to the decomposition of γU(Mo,Zr) phase. The U(<span class="hlt">Al</span>,Si) 3 and U 3Si 5 phases were identified in the interaction layers of γU(Mo,Pt)/<span class="hlt">Al</span> A356 and γU(Mo,Zr)/<span class="hlt">Al</span> A356 diffusion couples. These phases are formed due to the migration of Si to the interaction layer. In the diffusion couple U(Mo,Zr)/<span class="hlt">Al</span> A356, Zr 5<span class="hlt">Al</span> 3 phase was also identified in the interaction layer. The use of synchrotron radiation at Brazilian Synchrotron Light Laboratory (LNLS, CNPq, Campinas, Brazil) was necessary to achieve a complete crystallographic characterization.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/29452','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/29452"><span id="translatedtitle">TEM characterization of <span class="hlt">Al/Al</span>{sub 2}O{sub 3} composite fabricated by reactive metal infiltration</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Gao, Y.; Jia, J.; Loehman, R.E.; Ewsuk, K.G.</p> <p>1994-12-31</p> <p>The microstructure of <span class="hlt">Al/{alpha}-Al</span>{sub 2}0{sub 3} composites made by infiltrating <span class="hlt">Al</span> into dense mullite preforms has been characterized using transmission electron microscopy. Observations revealed that the formation of the <span class="hlt">Al/Al</span>{sub 2}0{sub 3} composites involves three stages. Initially, <span class="hlt">Al</span> infiltrates into a dense mullite preform through grain boundary diffusion, and reacts with mullite at grain boundaries to form a partial reaction zone. Then, a complete reaction takes place in the reaction region between the partial reaction zone and the full reaction zone to convert the dense mullite preform to a composite of {alpha}-<span class="hlt">Al</span>{sub 2}0{sub 3} (matrix) and an <span class="hlt">Al</span>-Si phase (thin channels). Finally, the reduced Si from the reaction diffuses out of the <span class="hlt">Al/Al</span>{sub 2}0{sub 3} composite through the metal channels, whereas <span class="hlt">Al</span> from the molten <span class="hlt">Al</span> pool is continuously drawn to the reaction region until the mullite preform is consumed or the sample is removed from the molten <span class="hlt">Al</span> pool. Based on the observed microstructure, infiltration mechanisms have been discussed, and a growth model of the composites is proposed in which the process involves repeated nucleation of <span class="hlt">Al</span>{sub 2}0{sub 3} grains and grain growth.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JSMME...4..167N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JSMME...4..167N"><span id="translatedtitle">Oxidation of Ti<span class="hlt">Al</span>3 and L12 Coatings on Ti-45<span class="hlt">Al</span>-5Nb Alloy at 1173K</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nishimoto, Takumi; Kitajima, Yuri; Hayashi, Shigenari; Narita, Toshio</p> <p></p> <p>Oxidation behavior of Ti<span class="hlt">Al</span>3 and L12 coated Ti-45at%<span class="hlt">Al</span>-5at%Nb alloys at 1173K in air was investigated using mass gain measurement, field emission scanning electron microscopy, transmission electron microscopy, electron-probe microanalysis, glow discharge optical electron spectroscopy, and glancing angle X-ray diffraction analysis. The Ti<span class="hlt">Al</span>3 formed meta-stable alumina ?-<span class="hlt">Al</span>2O3, while the oxide scale on the L12 consisted of a duplex structure with an outer rutile TiO2 and an inner ?-<span class="hlt">Al</span>2O3. During the very initial stages of oxidation both Ti and <span class="hlt">Al</span> in the L12 coating could be oxidized, and then the faster diffusing Ti goes out to form an outer, continuous Ti-rich oxide which covers the slow growing <span class="hlt">Al</span>2O3. In case of the Ti<span class="hlt">Al</span>3 an outer, continuous TiO2 layer was not observed because of the smaller amount of Ti in the Ti<span class="hlt">Al</span>3. It could be concluded that the outer, Ti-rich oxide enhanced a phase transformation of <span class="hlt">Al</span>2O3 from ? to ?. To elucidate the Ti effect, Ti-vapor treated Ti<span class="hlt">Al</span>3 and Ni-50at%<span class="hlt">Al</span> were oxidized at 1173K in air, and showed formation of an ?-<span class="hlt">Al</span>2O3, in contrast to ?-<span class="hlt">Al</span>2O3 on their bare alloys.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JPCS...89...84L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JPCS...89...84L"><span id="translatedtitle">Theoretical and experimental investigation on structural and electronic properties of <span class="hlt">Al/O/Al</span>, O-doped WS2</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Ning; Su, Jie; Xu, Zhuo; Li, Da-Peng; Liu, Zheng-Tang</p> <p>2016-02-01</p> <p>Effects of the doping atom (O, <span class="hlt">Al</span>, and (<span class="hlt">Al</span>, O)) on structural and electronic properties of the monolayer WS2 have been studied by using first-principles calculations. Results show that the covalent character of W-S bonding has been enhanced after doping. Meanwhile, W-O, <span class="hlt">Al-S</span> and W-S bonds of (<span class="hlt">Al</span>, O) co-doped WS2 monolayer have higher covalent character compared with O-doped and <span class="hlt">Al</span>-doped WS2 monolayer of this work. After doping with <span class="hlt">Al</span> (or <span class="hlt">Al</span>, O) atoms, Fermi level moves close to the valence band and the dopant atoms produce the defect energy levels, indicating that <span class="hlt">Al</span> doped and (<span class="hlt">Al</span>, O) co-doped WS2 monolayer both have p-type conductivity. O-doped and (<span class="hlt">Al</span>, O) co-doped WS2 ultrathin films was prepared on Si substrates. Results of Raman spectra show the formation of the O-doped and (<span class="hlt">Al</span>, O) co-doped WS2 films. Moreover, compared with the pure WS2, the approximate reduction of 0.43 eV and 0.46 eV for W 4f and S 2p in binding energy after (<span class="hlt">Al</span>, O) co-doped shows that p-type doping of (<span class="hlt">Al</span>, O) co-doped WS2 has been verified.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013ApSS..283...87W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013ApSS..283...87W"><span id="translatedtitle">Characterization of <span class="hlt">Al</span>2O3 coatings oxidized from <span class="hlt">Al</span> with different proportion of seed crystals at a lower temperature</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, Chen; Lin, Yuebin; He, Fei; Luo, Xinyi; Tao, Jie</p> <p>2013-10-01</p> <p><span class="hlt">Al</span> layer with ?-<span class="hlt">Al</span>2O3 seed crystals was prepared on the surface of 316L stainless steel (SS) by a double cathodes discharge technique, in which the mixed targets of pure <span class="hlt">Al</span> doped with different proportions of ?-<span class="hlt">Al</span>2O3 were used. Then, <span class="hlt">Al</span>2O3 coatings were obtained after plasma oxidization at 580 °C. The phase composition, microstructure and morphology of the coatings were studied respectively by means of glancing-angle (1°) X-ray diffractometry (GAXRD) and scanning electron microscopy (SEM). Furthermore, the bonding force and corrosion resistance of the coatings were measured. The results indicated that ?-<span class="hlt">Al</span>2O3 nucleated and grew surrounding the seed crystals as the Volmer-Weber Mode. The <span class="hlt">Al</span>2O3 coating was compact, performing a good corrosion resistance and metallurgical bonding. The inducing effects of ?-<span class="hlt">Al</span>2O3 with different fractions were discussed. ?-<span class="hlt">Al</span>2O3 (5.5 wt.%) was distributed in the <span class="hlt">Al</span> layer when the target possessing 10% ?-<span class="hlt">Al</span>2O3 was used. After plasma oxidation, 65.54 wt.% ?-<span class="hlt">Al</span>2O3 was obtained which was 10.34% more than that obtained by the oxidation of pure <span class="hlt">Al</span> at the same condition. However, the inducing effects became weak with the further increment of content of ?-<span class="hlt">Al</span>2O3 seed crystals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26258886','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26258886"><span id="translatedtitle">Theory and X-ray Absorption Spectroscopy for Aluminum Coordination Complexes – <span class="hlt">Al</span> K-Edge Studies of Charge and Bonding in (BDI)<span class="hlt">Al</span>, (BDI)<span class="hlt">Al</span>R2, and (BDI)<span class="hlt">Al</span>X2 Complexes.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Altman, Alison B; Pemmaraju, C D; Camp, Clément; Arnold, John; Minasian, Stefan G; Prendergast, David; Shuh, David K; Tyliszczak, Tolek</p> <p>2015-08-19</p> <p>Polarized aluminum K-edge X-ray absorption near edge structure (XANES) spectroscopy and first-principles calculations were used to probe electronic structure in a series of (BDI)<span class="hlt">Al</span>, (BDI)<span class="hlt">Al</span>X2, and (BDI)<span class="hlt">Al</span>R2 coordination compounds (X = F, Cl, I; R = H, Me; BDI = 2,6-diisopropylphenyl-?-diketiminate). Spectral interpretations were guided by examination of the calculated transition energies and polarization-dependent oscillator strengths, which agreed well with the XANES spectroscopy measurements. Pre-edge features were assigned to transitions associated with the <span class="hlt">Al</span> 3p orbitals involved in metal-ligand bonding. Qualitative trends in <span class="hlt">Al</span> 1s core energy and valence orbital occupation were established through a systematic comparison of excited states derived from <span class="hlt">Al</span> 3p orbitals with similar symmetries in a molecular orbital framework. These trends suggested that the higher transition energies observed for (BDI)<span class="hlt">Al</span>X2 systems with more electronegative X(1-) ligands could be ascribed to a decrease in electron density around the aluminum atom, which causes an increase in the attractive potential of the <span class="hlt">Al</span> nucleus and concomitant increase in the binding energy of the <span class="hlt">Al</span> 1s core orbitals. For (BDI)<span class="hlt">Al</span> and (BDI)<span class="hlt">Al</span>H2 the experimental <span class="hlt">Al</span> K-edge XANES spectra and spectra calculated using the eXcited electron and Core-Hole (XCH) approach had nearly identical energies for transitions to final state orbitals of similar composition and symmetry. These results implied that the charge distributions about the aluminum atoms in (BDI)<span class="hlt">Al</span> and (BDI)<span class="hlt">Al</span>H2 are similar relative to the (BDI)<span class="hlt">Al</span>X2 and (BDI)<span class="hlt">Al</span>Me2 compounds, despite having different formal oxidation states of +1 and +3, respectively. However, (BDI)<span class="hlt">Al</span> was unique in that it exhibited a low-energy feature that was attributed to transitions into a low-lying p-orbital of b1 symmetry that is localized on <span class="hlt">Al</span> and orthogonal to the (BDI)<span class="hlt">Al</span> plane. The presence of this low-energy unoccupied molecular orbital on electron-rich (BDI)<span class="hlt">Al</span> distinguishes its valence electronic structure from that of the formally trivalent compounds (BDI)<span class="hlt">Al</span>X2 and (BDI)<span class="hlt">Al</span>R2. The work shows that <span class="hlt">Al</span> K-edge XANES spectroscopy can be used to provide valuable insight into electronic structure and reactivity relationships for main-group coordination compounds. PMID:26258886</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19930060673&hterms=1051&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3D%2526%25231051','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19930060673&hterms=1051&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3D%2526%25231051"><span id="translatedtitle">Investigation of etching techniques for superconductive Nb/<span class="hlt">Al-Al</span>2O3/Nb fabrication processes</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lichtenberger, A. W.; Lea, D. M.; Lloyd, F. L.</p> <p>1993-01-01</p> <p>Wet etching, CF4 and SF6 reactive ion etching (RIE), RIE/wet hybrid etching, Cl-based RIE, ion milling, and liftoff techniques have been investigated for use in superconductive Nb/<span class="hlt">Al-Al</span>2O3/Nb fabrication processes. High-quality superconductor-insulator-superconductor (SIS) junctions have been fabricated using a variety of these etching methods; however, each technique offers distinct tradeoffs for a given process an wafer design. In particular, it was shown that SF6 provides an excellent RIE chemistry for low-voltage anisotropic etching of Nb with high selectivity to <span class="hlt">Al</span>. The SF6 tool has greatly improved the trilevel resist junction insulation process. Excellent repeatability, selectivity with respect to quartz, and submicron resolution make Cl2 + BCl3 + CHCl3 RIE a very attractive process for trilayer patterning.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1110976','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1110976"><span id="translatedtitle">Energy localization on the <span class="hlt">Al</span> sublattice of Pt3<span class="hlt">Al</span> with L12 order</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Medvedev, Nikolay N; Starostenkov, Mikhail D; Manley, Michael E</p> <p>2013-01-01</p> <p>A three-dimensional molecular-dynamics model of with order was developed and found to support the excitation of discrete breathers (DBs) and energy localization on the <span class="hlt">Al</span> sublattice. For an initial lattice temperature of 0 K, large-amplitude DBs polarized along [100] are found to be very weakly damped, retaining most of their initial energy for more than 2000 cycles, while DBs polarized along [111] damped out over ~30 cycles. Because the DBs and their dissipation channels are confined to the <span class="hlt">Al</span> sublattice, long-lived nonequilibrium states with large energy differences between the <span class="hlt">Al</span> and Pt sublattices occur. Since collisions during irradiation more efficiently generate lattice vibrations in light atoms than heavy atoms, such nonequilibrium states may occur and alter the relaxation processes occurring during radiation damage.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20001568','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20001568"><span id="translatedtitle">High-temperature deformation of uniaxially aligned lamellar Ti<span class="hlt">Al</span>/Ti{sub 3}<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Heinrich, H.; Abaecherli, V.; Wilkins, D.J.; Kostorz, G.</p> <p>1999-07-01</p> <p>Uniaxially aligned polysynthetically twinned two-phase Ti<span class="hlt">Al</span>/Ti{sub 3}<span class="hlt">Al</span> material is produced by induction zone melting and deformed in uniaxial compression. Above 1,000 K the strain rate sensitivity is independent of the lamellar orientation and increases strongly with increasing deformation temperature. Results for the strain rate sensitivity parameters are somewhat lower than those obtained for {gamma}-Ti<span class="hlt">Al</span> single- and polycrystals. If the lamellae are oriented parallel or perpendicular to the deformation axis, the flow stress decreases with increasing strain. After plastic deformation the dislocation density in the lamellae is remarkably low indicating recovery processes. At the lamellar interfaces misfit dislocations and periodic arrangements of dislocations with Burgers vectors inclined to the lamellar boundaries are found. In contrast to deformation at lower temperatures, deformation twinning is rare.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014ApPhL.105d1909C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014ApPhL.105d1909C"><span id="translatedtitle">Local stress-induced effects on <span class="hlt">AlGaAs/Al</span>Ox oxidation front shape</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chouchane, F.; Almuneau, G.; Cherkashin, N.; Arnoult, A.; Lacoste, G.; Fontaine, C.</p> <p>2014-07-01</p> <p>The lateral oxidation of thick <span class="hlt">Al</span>GaAs layers (>500 nm) is studied. An uncommon shape of the oxide tip is evidenced and attributed to the embedded stress distribution, inherent to the oxidation reaction. Experimental and numerical studies of the internal strain in oxidized AlxGa1-xAs/GaAs structures were carried out by dark-field electron holography and finite element methods. A mapping of the strain distribution around the <span class="hlt">Al</span>GaAs/oxide interface demonstrates the main role of internal stress on the shaping of the oxide front. These results demonstrate the high relevance of strain in oxide-confined III-V devices, in particular, with over-500-nm thick <span class="hlt">Al</span>Ox confinement layers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19780069154&hterms=HR+diagrams&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3D%2528HR%2Bdiagrams%2529','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19780069154&hterms=HR+diagrams&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3D%2528HR%2Bdiagrams%2529"><span id="translatedtitle">Reaction diffusion in the NiCr<span class="hlt">Al</span> and CoCr<span class="hlt">Al</span> systems</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Levine, S. R.</p> <p>1978-01-01</p> <p>The paper assesses the effect of overlay coating and substrate composition on the kinetics of coating depletion by interdiffusion. This is accomplished by examining the constitution, kinetics and activation energies for a series of diffusion couples primarily of the NiCr<span class="hlt">Al</span>/Ni-10Cr or CoCr<span class="hlt">Al</span>/Ni-10Cr type annealed at temperatures in the range 1000-1205 C for times up to 500 hr. A general procedure is developed for analyzing diffusion in multicomponent multiphase systems. It is shown that by introducing the concept of beta-source strength, which can be determined from appropriate phase diagrams, the Wagner solution for consumption of a second phase in a semiinfinite couple is successfully applied to the analysis of MCr<span class="hlt">Al</span> couples. Thus, correlation of beta-recession rate constants with couple composition, total and diffusional activation energies, and interdiffusion coefficients are determined.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/958938','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/958938"><span id="translatedtitle">FORMING <span class="hlt">Al-Al</span>2O3 NANOCOMPOSITE SURFACES USING FRICTION STIR PROCESSING</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Qu, Jun; Xu, Hanbing; Feng, Zhili; An, Ke; Battiste, Rick; An, Linan; Heinrich, Helge</p> <p>2009-01-01</p> <p>This study presents a solid state surface engineering process to form a nanocomposite layer on aluminum surface. Friction stir processing (FSP) was used to stir and mix nano-sized <span class="hlt">Al</span>2O3 particles into a commercially pure aluminum surface to form an <span class="hlt">Al-Al</span>2O3 nanocomposite layer of up to several millimeters thick. Compared with a non-processed aluminum surface, a nanocomposite surface with 15 vol% nano-particles has demonstrated increased hardness (by 3X) and yield strength (by 10X), and reduced friction coefficient (by 55%) and wear rate (by 100X). Transmission electron microscopy (TEM) has revealed high matrix dislocation density in the nanocomposite surface that is believed to be largely responsible to such significant property improvements. Neutron diffraction measurements suggested tensile residual stress in the aluminum matrix. The stress was mainly induced by thermal-expansion-mismatch between aluminum and alumina.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21194991','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21194991"><span id="translatedtitle">Growth and characterization of Ti<span class="hlt">AlN/CrAl</span>N superlattices prepared by reactive direct current magnetron sputtering</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Barshilia, Harish C.; Deepthi, B.; Rajam, K. S.; Bhatti, Kanwal Preet; Chaudhary, Sujeet</p> <p>2009-01-15</p> <p>Ti<span class="hlt">Al</span>N and Cr<span class="hlt">Al</span>N coatings were prepared using a reactive direct current magnetron sputtering system from Ti<span class="hlt">Al</span> and Cr<span class="hlt">Al</span> targets. Structural characterization of the coatings using x-ray diffraction (XRD) revealed the B1 NaCl structure of Ti<span class="hlt">Al</span>N and Cr<span class="hlt">Al</span>N coatings with a prominent reflection along the (111) plane. The XPS data confirmed the bonding structures of Ti<span class="hlt">Al</span>N and Cr<span class="hlt">Al</span>N single layer coatings. Subsequently, nanolayered multilayer coatings of Ti<span class="hlt">AlN/CrAl</span>N were deposited on silicon and mild steel (MS) substrates at different modulation wavelengths ({lambda}) with a total thickness of approximately 1.0 {mu}m. The modulation wavelengths were calculated from the x-ray reflectivity data using modified Bragg's law. Ti<span class="hlt">AlN/CrAl</span>N multilayer coatings were textured along (111) for {lambda}<200 A and the XRD patterns showed the formation of superlattice structure for coatings deposited at {lambda}=102 A. The x-ray reflectivity data showed reflections of fifth and seventh orders for multilayer coatings deposited at {lambda}=102 and 138 A, respectively, indicating the formation of sharp interfaces between Ti<span class="hlt">Al</span>N and Cr<span class="hlt">Al</span>N layers. The cross-sectional scanning electron microscopy image of Ti<span class="hlt">AlN/CrAl</span>N multilayer coatings indicated a noncolumnar and dense microstructure. A maximum hardness of 39 GPa was observed for Ti<span class="hlt">AlN/CrAl</span>N multilayer coatings deposited at {lambda}=93 A, which was higher than the rule-of-mixture value (30 GPa) for Ti<span class="hlt">Al</span>N and Cr<span class="hlt">Al</span>N. Study of thermal stability of the coatings in air using micro-Raman spectroscopy indicated that the Ti<span class="hlt">AlN/CrAl</span>N multilayer coatings were stable up to 900 deg. C in air. Ti<span class="hlt">AlN/CrAl</span>N multilayer coatings also exhibited improved corrosion resistance when compared to the MS substrate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19930041111&hterms=therms&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dtherms','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19930041111&hterms=therms&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dtherms"><span id="translatedtitle">Transformation to Ni5<span class="hlt">Al</span>3 in a 63.0 at. pct Ni-<span class="hlt">Al</span> alloy</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Khadkikar, P. S.; Locci, I. E.; Vedula, K.; Michal, G. M.</p> <p>1993-01-01</p> <p>Microstructures of 63 at. pct P/M Ni-<span class="hlt">Al</span> alloys with a composition close to the stoichiometry of the Ni5<span class="hlt">Al</span>3 phase were investigated using homogenized and quenched specimens aged at low temperatures for various times. Results of analyses of XRD data and electron microscopy observations were used for quantitative phase analysis, performed to calculate the (Ni<span class="hlt">Al</span> + Ni5<span class="hlt">Al</span>3)/Ni5<span class="hlt">Al</span>3 phase boundary locations. The measured lattice parameters of Ni5<span class="hlt">Al</span>3 phase formed at 823, 873, and 923 K indicated an increase in tetragonality of the phase with increasing nickel content.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/865693','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/865693"><span id="translatedtitle">Acoustic resonator with <span class="hlt">Al</span> electrodes on an <span class="hlt">Al</span>N layer and using a GaAs substrate</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Kline, Gerald R.; Lakin, Kenneth M.</p> <p>1985-12-03</p> <p>A method of fabricating an acoustic wave resonator wherein all processing steps are accomplished from a single side of said substrate. The method involves deposition of a multi-layered <span class="hlt">Al/Al</span>N structure on a GaAs substrate followed by a series of fabrication steps to define a resonator from said composite. The resulting resonator comprises an <span class="hlt">Al</span>N layer between two <span class="hlt">Al</span> layers and another layer of <span class="hlt">Al</span>N on an exterior of one of said <span class="hlt">Al</span> layers.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_16 --> <div id="page_17" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="321"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1984ric..rept.....C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1984ric..rept.....C"><span id="translatedtitle">Ga<span class="hlt">Al</span>As Sb APD optimization</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chin, R.</p> <p>1984-10-01</p> <p>It has been demonstrated that avalanche gain can be obtained in Ga<span class="hlt">Al</span>Sb avalanche photodiodes which exhibit ionization coefficient enhancement. These devices exhibit gain at relatively high impurity background density of 8-9 x 10 to the 15th power/cu cm. This indicates that a tunneling process which occurs in these devices is associated with a deep level rather than a band-to-band process. Surface leakage current, which dominates the total dark current of these avalanche photodiodes at room temperature, can be reduced with the use of special structures. However, as shown in this work through both modeling and experiment, defect assisted tunneling may be a fundamental limitation to obtaining high sensitivity devices. Finally, a serious problem from the manufacturing standpoint is the necessity to compensate the native defect that results in a high concentration of intrinsic p-type acceptor levels. Precise control of dopant incorporation is required to reproducibly obtain the required net impurity levels. This is an extremely difficult process with the available LPE Ga<span class="hlt">Al</span>Sb materials technology.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4498448','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4498448"><span id="translatedtitle">Abrupt Schottky Junctions in <span class="hlt">Al</span>/Ge Nanowire Heterostructures</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2015-01-01</p> <p>In this Letter we report on the exploration of axial metal/semiconductor (<span class="hlt">Al</span>/Ge) nanowire heterostructures with abrupt interfaces. The formation process is enabled by a thermal induced exchange reaction between the vapor–liquid–solid grown Ge nanowire and <span class="hlt">Al</span> contact pads due to the substantially different diffusion behavior of Ge in <span class="hlt">Al</span> and vice versa. Temperature-dependent I–V measurements revealed the metallic properties of the crystalline <span class="hlt">Al</span> nanowire segments with a maximum current carrying capacity of about 0.8 MA/cm2. Transmission electron microscopy (TEM) characterization has confirmed both the composition and crystalline nature of the pure <span class="hlt">Al</span> nanowire segments. A very sharp interface between the ?111? oriented Ge nanowire and the reacted <span class="hlt">Al</span> part was observed with a Schottky barrier height of 361 meV. To demonstrate the potential of this approach, a monolithic <span class="hlt">Al/Ge/Al</span> heterostructure was used to fabricate a novel impact ionization device. PMID:26052733</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/428172','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/428172"><span id="translatedtitle">Wet chemical etching of <span class="hlt">Al</span>N and In<span class="hlt">Al</span>N in KOH solutions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Vartuli, C.B.; Pearton, S.J.; Lee, J.W.; Abernathy, C.R.; Mackenzie, J.D.; Zolper, J.C.; Shul, R.J.; Ren, F.</p> <p>1996-11-01</p> <p>Wet chemical etching of <span class="hlt">Al</span>N and In{sub x}<span class="hlt">Al</span>{sub 1{minus}x}N was investigated in KOH-based solutions as a function of etch temperature and material quality. The etch rates for both materials increased with increasing etch temperatures, which was varied from 20 to 80 C. The crystal quality of <span class="hlt">Al</span>N prepared by reactive sputtering was improved by rapid thermal annealing at temperatures to 1,100 C, with a decreased wet etch rate of the material measured with increasing anneal temperature. The etch rate decreased approximately an order of magnitude at 80 C etch temperature after an 1,100 C anneal. The etch rate for In{sub 0.19}<span class="hlt">Al</span>{sub 0.81}N grown by metallorganic molecular beam epitaxy was approximately three times higher for material on Si than on GaAs. This corresponds to the superior crystalline quality of the material grown on GaAs. Etching of In{sub x}<span class="hlt">Al</span>{sub 1{minus}x}N was also examined as a function of In composition. The etch rate initially increased as the In composition changed from 0 to 36%, and then decreased to 0 {angstrom}min for InN. The authors also compared the effect of doping concentration on etch rate. Two In<span class="hlt">Al</span>N samples of similar crystal quality were also etched; one was fully depleted with n < 10{sup 16} cm{sup {minus}3} (2.6% In) and the other n {approximately} 5 {times} 10{sup 18} cm{sup {minus}3} (3.1% In). At low etch temperature, the rates were similar, but above 60 C the n-type sample etched faster, approximately three times faster at 80 C. The activation energy for these etches is very low, 2.0 {+-} 0.5 kcal/mol for the sputtered <span class="hlt">Al</span>N. The activation energies for In<span class="hlt">Al</span>N were dependent on In composition and were in the range 2 to 6 kcal/mol. GaN and InN layers did not show any etching in KOH at temperatures up to 80 C.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JOM....67h1881Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JOM....67h1881Z"><span id="translatedtitle">Molar Volume Modeling of Ti-<span class="hlt">Al</span>-Nb and Ti-<span class="hlt">Al</span>-Mo Ternary Systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhu, Jun; Zhang, Chuan; Cao, Weisheng; Chen, Shuanglin; Zhang, Fan; Park, Joon Sik; Yi, Seonghoon</p> <p>2015-08-01</p> <p>Molar volume modeling was performed for both Ti-<span class="hlt">Al</span>-Nb and Ti-<span class="hlt">Al</span>-Mo ternary systems based on the thermodynamic modeling of these two systems. Comparison between the calculated phase equilibria and the experimental data proved the accuracy of thermodynamic modeling. With the calculated density contour curves superimposed on the equilibrium phase diagram, it provides a map for alloy developers to identify the promising alloy compositions that satisfy both the phase stability and density requirements and rule out those that fail to meet the requirements.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MMTA...46.4772N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MMTA...46.4772N"><span id="translatedtitle">Through Thickness Microstructural and Texture Inhomogeneity Within <span class="hlt">Al</span> Layers in ARB-Produced <span class="hlt">Al-Al</span>(Sc) Layered Composite Sheets</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Najafzadeh, Niloofar; Quadir, M. Z.; Munroe, Paul</p> <p>2015-10-01</p> <p>Alternatively layered composite sheets of commercially pure (99.8 pct purity) aluminum and an <span class="hlt">Al</span>-0.3wtpctSc alloy (either in the supersaturated solid solution or age-hardened conditions) were generated through accumulative roll bonding for up to 5 cycles. The transverse sections of the sheets were examined to investigate the microstructure and texture inhomogeneities developed during the rolling process. Electron backscatter diffraction and transmission electron microscopy was used for this investigation. It was found that an inhomogeneous microstructure and texture was developed through the aluminum layers of the sheet thickness. The nature of inhomogeneities changes as the ARB bonding progresses to higher cycles. Microstructural inhomogeneities remain prominent in the first ARB cycle and diminish during the subsequent cycles. Texture inhomogeneities appear in different forms as rolling progresses. High frictional shear forces in the surface and in-plane shear forces across bonding interfaces derive these inhomogeneities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016MMTB...47...89W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016MMTB...47...89W"><span id="translatedtitle">Simulation Study of <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si Circular Clad Ingots Prepared by Direct Chill Casting</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wu, Li; Kang, Huijun; Chen, Zongning; Fu, Ying; Wang, Tongmin</p> <p>2016-02-01</p> <p>A modified direct chill casting process based on Novelis FusionTM Technology co-casting process was used recently to prepare <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si circular clad ingots. In the current study, a comprehensive simulation model was developed to investigate the direct chill casting process for preparing the <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si circular clad ingots, and a parametric study and experimental research of the direct chill casting process was conducted to explore potential success and failure casting conditions. The simulation results revealed the bonding mechanism of the <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si interface in the direct chill casting process and identified the effect of certain parameters on casting performance. The results indicated that the effect of casting speed and <span class="hlt">Al</span>-1Mn casting temperature on the variations of the minimum solid fraction of <span class="hlt">Al</span>-1Mn at the interface is stronger than that of cooling water flow rate in inner mold, while <span class="hlt">Al</span>-10Si casting temperature is the weakest of the four casting parameters. The corresponding experimental results verified that <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si circular clad ingot with acceptable metallurgical bonding can be successfully prepared by direct chill casting process under the proper casting parameters. The thickness of diffusion zone is about 40 μm, and the fractured position in tensile test was located in the <span class="hlt">Al</span>-1Mn alloy side which indicated the strength of the interfacial region is higher than that of <span class="hlt">Al</span>-1Mn alloy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MMTA...46.4783L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MMTA...46.4783L"><span id="translatedtitle">Effect of <span class="hlt">Al</span> on the Wetting Behavior Between TiC x and Molten Ti-<span class="hlt">Al</span> Alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Xuyang; Lv, Xuewei; Dong, Hongbiao; Li, Chunxin; Bai, Chenguang</p> <p>2015-10-01</p> <p>The wetting behavior and the interfacial reactions between TiC x substrate and molten Ti-<span class="hlt">Al</span> alloys with different <span class="hlt">Al</span> contents were studied using the Sessile Drop method at 1758 K (1485 °C) in argon atmosphere. It is found that the wettability and interface reaction products depend on <span class="hlt">Al</span> content in the molten alloy. The initial contact angles between the molten Ti-<span class="hlt">Al</span> alloy and TiC0.78 surface reduces from 110 to 80 deg when <span class="hlt">Al</span> content in the alloy changes from 40 to 80 wt pct. The reduction in the initial contact angle is due to the decrease of surface tension of the molten Ti-<span class="hlt">Al</span> alloys with increasing <span class="hlt">Al</span> contents. The segregation of <span class="hlt">Al</span> atoms to the surface occurred at all bulk concentrations of Ti-<span class="hlt">Al</span> alloys. <span class="hlt">Al</span> with lower surface tension tends to segregate on the surface of liquid Ti-<span class="hlt">Al</span> alloy. In the spreading stage, the interfacial reaction led to the decrease in the contact angle. The adhesion in Ti-<span class="hlt">Al</span>/TiC x system can be interpreted in terms of strong chemical interactions, which is greatly affected by the diffusion of C. The equilibrium contact angle was measured less than 10 deg. Finally, the reaction sequence at the Ti-<span class="hlt">Al</span> melt and TiC x substrate interface is proposed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26373112','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26373112"><span id="translatedtitle">Effect of <span class="hlt">Al</span> Doping on Optical Band Gap Energy of <span class="hlt">Al</span>-TiO2 Thin Films.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Song, Yo-Seung; Kim, Bae-Yeon; Cho, Nam-Ihn; Lee, Deuk Yong</p> <p>2015-07-01</p> <p><span class="hlt">Al</span>-TiO2 thin films were prepared using a sol-gel derived spin coating by varying the <span class="hlt">Al</span>/Ti molar ratio from 0 to 0.73 to investigate the effect of <span class="hlt">Al</span> doping on the optical band gap energy (Eg) of the films. GAXRD results indicated that <span class="hlt">Al</span>-TiO2 is composed of anatase and FTO phases when the <span class="hlt">Al</span>/Ti molar ratio was less than 0.18. Above 0.38, no other peaks except FTO were found and transparency of the films was severely deteriorated. Eg of <span class="hlt">Al</span>-TiO2 decreased from 3.20 eV to 2.07 eV when the <span class="hlt">Al</span>/Ti ratio was raised from 0 to 0.38. Eg of 2.59 eV was found for the anatase <span class="hlt">Al</span>-TiO2 films having the <span class="hlt">Al</span>/Ti ratio of 0.18. The absorption band of <span class="hlt">Al</span>-TiO2 coatings shifted dramatically from the UV region to the visible region with increasing the amount of <span class="hlt">Al</span> dopant. The <span class="hlt">Al</span> doping was mainly attributed to the optical band gap energy of <span class="hlt">Al</span>-TiO2. PMID:26373112</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MMTB..tmp..216W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MMTB..tmp..216W"><span id="translatedtitle">Simulation Study of <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si Circular Clad Ingots Prepared by Direct Chill Casting</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wu, Li; Kang, Huijun; Chen, Zongning; Fu, Ying; Wang, Tongmin</p> <p>2015-10-01</p> <p>A modified direct chill casting process based on Novelis FusionTM Technology co-casting process was used recently to prepare <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si circular clad ingots. In the current study, a comprehensive simulation model was developed to investigate the direct chill casting process for preparing the <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si circular clad ingots, and a parametric study and experimental research of the direct chill casting process was conducted to explore potential success and failure casting conditions. The simulation results revealed the bonding mechanism of the <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si interface in the direct chill casting process and identified the effect of certain parameters on casting performance. The results indicated that the effect of casting speed and <span class="hlt">Al</span>-1Mn casting temperature on the variations of the minimum solid fraction of <span class="hlt">Al</span>-1Mn at the interface is stronger than that of cooling water flow rate in inner mold, while <span class="hlt">Al</span>-10Si casting temperature is the weakest of the four casting parameters. The corresponding experimental results verified that <span class="hlt">Al</span>-1Mn/<span class="hlt">Al</span>-10Si circular clad ingot with acceptable metallurgical bonding can be successfully prepared by direct chill casting process under the proper casting parameters. The thickness of diffusion zone is about 40 ?m, and the fractured position in tensile test was located in the <span class="hlt">Al</span>-1Mn alloy side which indicated the strength of the interfacial region is higher than that of <span class="hlt">Al</span>-1Mn alloy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19890030007&hterms=coal&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dcoal','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19890030007&hterms=coal&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dcoal"><span id="translatedtitle">Mechanisms of elevated-temperature deformation in the B2 aluminides Ni<span class="hlt">Al</span> and Co<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Yaney, D. L.; Nix, W. D.</p> <p>1988-01-01</p> <p>A strain rate change technique, developed previously for distinguishing between pure-metal and alloy-type creep behavior, was used to study the elevated-temperature deformation behavior of the intermetallic compounds Ni<span class="hlt">Al</span> and Co<span class="hlt">Al</span>. Tests on Ni<span class="hlt">Al</span> were conducted at temperatures between 1100 and 1300 K while tests on Co<span class="hlt">Al</span> were performed at temperatures ranging from 1200 to 1400 K. Ni<span class="hlt">Al</span> exhibits pure-metal type behavior over the entire temperature range studied. Co<span class="hlt">Al</span>, however, undergoes a transition from pure-metal to alloy-type deformation behavior as the temperature is decreased from 1400 to 1200 K. Slip appears to be inherently more difficult in Co<span class="hlt">Al</span> than in Ni<span class="hlt">Al</span>, with lattice friction effects limiting the mobility of dislocations at a much higher tmeperature in Co<span class="hlt">Al</span> than in Ni<span class="hlt">Al</span>. The superior strength of Co<span class="hlt">Al</span> at elevated temperatures may, therefore, be related to a greater lattice friction strengthening effect in Co<span class="hlt">Al</span> than in Ni<span class="hlt">Al</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JMoSt1100..154M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JMoSt1100..154M"><span id="translatedtitle">Comparison on the interaction of <span class="hlt">Al</span>3+/nano-<span class="hlt">Al</span>13 with calf thymus DNA /salmon sperm DNA</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ma, Fei; Ma, Yue; Du, Changwen; Yang, Xiaodi; Shen, Renfang</p> <p>2015-11-01</p> <p>The conformation change, binding mode and binding site between <span class="hlt">Al</span>3+/nano-<span class="hlt">Al</span>13 and calf thymus DNA/salmon sperm DNA were investigated by UV-vis absorption, FTIR spectra, Raman spectroscopy and CD spectra, as well as melting curves measurement. The UV-vis spectra and circular dichroism spectra results suggested that the phosphate group structure was changed when <span class="hlt">Al</span>3+ interacted with DNA, while the double-helix was distorted when nano-<span class="hlt">Al</span>13 interacted with DNA. The FTIR and Raman spectroscopy revealed that the binding sites were <span class="hlt">Al</span>3+ … PO2, <span class="hlt">Al</span>3+ … N7/guanine PO2 … <span class="hlt">Al</span>13 … N7-C8/guanine with calf thymus DNA, and <span class="hlt">Al</span>3+ … N3-O2/cytosine, <span class="hlt">Al</span>3+ … N7-C8/guanine, PO2 … <span class="hlt">Al</span>13 … N7-C8/guanine, PO2 … <span class="hlt">Al</span>13 … N1/adenine with salmon sperm DNA, respectively. The electrostatic binding was existed between <span class="hlt">Al</span>3+ and DNA, and the electrostatic binding and complexing were found between nano-<span class="hlt">Al</span>13 and DNA.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JTST...25..509Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JTST...25..509Z"><span id="translatedtitle">Influence of FeCr<span class="hlt">Al</span> Content on Microstructure and Bonding Strength of Plasma-Sprayed FeCr<span class="hlt">Al/Al</span>2O3 Coatings</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhou, Liang; Luo, Fa; Zhou, Wancheng; Zhu, Dongmei</p> <p>2016-02-01</p> <p>Low-power plasma-sprayed FeCr<span class="hlt">Al/Al</span>2O3 composite coatings with 1.5 mm thickness have been fabricated for radar absorption applications. The effects of FeCr<span class="hlt">Al</span> content on the coating properties were studied. The FeCr<span class="hlt">Al</span> presents in the form of a few thin lamellae and numerous particles, demonstrating relatively even distribution in all the coatings. Results show that the micro-hardness and porosity decrease with the increase in FeCr<span class="hlt">Al</span> content. With FeCr<span class="hlt">Al</span> content increasing from 28 to 47 wt.%, the bonding strength of the coatings with 1.5 mm thickness increases from 10.5 to 27 MPa, and the failure modes are composed of cohesive and adhesive failure, which are ascribed to the coating microstructure and the residual stress, respectively.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JTST..tmp..151Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JTST..tmp..151Z"><span id="translatedtitle">Influence of FeCr<span class="hlt">Al</span> Content on Microstructure and Bonding Strength of Plasma-Sprayed FeCr<span class="hlt">Al/Al</span>2O3 Coatings</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhou, Liang; Luo, Fa; Zhou, Wancheng; Zhu, Dongmei</p> <p>2015-12-01</p> <p>Low-power plasma-sprayed FeCr<span class="hlt">Al/Al</span>2O3 composite coatings with 1.5 mm thickness have been fabricated for radar absorption applications. The effects of FeCr<span class="hlt">Al</span> content on the coating properties were studied. The FeCr<span class="hlt">Al</span> presents in the form of a few thin lamellae and numerous particles, demonstrating relatively even distribution in all the coatings. Results show that the micro-hardness and porosity decrease with the increase in FeCr<span class="hlt">Al</span> content. With FeCr<span class="hlt">Al</span> content increasing from 28 to 47 wt.%, the bonding strength of the coatings with 1.5 mm thickness increases from 10.5 to 27 MPa, and the failure modes are composed of cohesive and adhesive failure, which are ascribed to the coating microstructure and the residual stress, respectively.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/1178259','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/1178259"><span id="translatedtitle">MCr<span class="hlt">Al</span>Y bond coat with enhanced Yttrium layer</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Jablonski, Paul D; Hawk, Jeffrey A</p> <p>2015-04-21</p> <p>One or more embodiments relates to an MCr<span class="hlt">Al</span>Y bond coat comprising an MCr<span class="hlt">Al</span>Y layer in contact with a Y--<span class="hlt">Al</span>.sub.2O.sub.3 layer. The MCr<span class="hlt">Al</span>Y layer is comprised of a .gamma.-M solid solution, a .beta.-MAl intermetallic phase, and Y-type intermetallics. The Y--<span class="hlt">Al</span>.sub.2O.sub.3 layer is comprised of Yttrium atoms coordinated with oxygen atoms comprising the <span class="hlt">Al</span>.sub.2O.sub.3 lattice. Both the MCr<span class="hlt">Al</span>Y layer and the Y--<span class="hlt">Al</span>.sub.2O.sub.3 layer have a substantial absence of Y--<span class="hlt">Al</span> oxides, providing advantage in the maintainability of the Yttrium reservoir within the MCr<span class="hlt">Al</span>Y bulk. The MCr<span class="hlt">Al</span>Y bond coat may be fabricated through application of a Y.sub.2O.sub.3 paste to an MCr<span class="hlt">Al</span>Y material, followed by heating in a non-oxidizing environment.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=als&id=EJ1004284','ERIC'); return false;" href="http://eric.ed.gov/?q=als&id=EJ1004284"><span id="translatedtitle">The Practical Enactment of Adventure Learning: Where Will You <span class="hlt">AL</span>@?</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Miller, Brant G.; Hougham, R. Justin; Eitel, Karla Bradley</p> <p>2013-01-01</p> <p>The Adventure Learning (<span class="hlt">AL</span>) approach to designing and implementing learning experiences has great potential for practitioners. This manuscript delineates the practical enactment of <span class="hlt">AL</span> to support the K-12 community, teacher educators, and residential environmental science program providers in the conceptualization and delivery of their own <span class="hlt">AL</span>…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24981792','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24981792"><span id="translatedtitle">Diagnostic timelines and delays in diagnosing amyotrophic lateral sclerosis (<span class="hlt">ALS</span>).</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Paganoni, Sabrina; Macklin, Eric A; Lee, Alexandra; Murphy, Alyssa; Chang, Judith; Zipf, Amanda; Cudkowicz, Merit; Atassi, Nazem</p> <p>2014-09-01</p> <p>The objective of this study was to characterize the diagnostic timelines and their predictors in people with amyotrophic lateral sclerosis (<span class="hlt">ALS</span>). Patients were identified through <span class="hlt">ALS</span> billing codes. Time from presenting symptom to first doctor visit, first doctor visit to suspected <span class="hlt">ALS</span> diagnosis, suspected to confirmed <span class="hlt">ALS</span> diagnosis, and presenting symptom to confirmed <span class="hlt">ALS</span> diagnosis (total diagnostic time) were collected. Regression models were used to analyze the predictors of diagnostic delay. Three hundred and four <span class="hlt">ALS</span> patients were included in the analysis. Median total diagnostic time was 11.5 months. Diagnostic timelines were longer in patients with age > 60 years (p < 0.001), sporadic <span class="hlt">ALS</span> (p = 0.043), and limb onset (p = 0.010). The presence of fasciculations, slurred speech, and lower extremity weakness when symptoms were first noted were independent predictors of shorter time to <span class="hlt">ALS</span> diagnosis (p = 0.04, p = 0.02, and p = 0.04, respectively). About half of the patients (52%) received an alternative diagnosis and each patient saw an average of three different physicians before <span class="hlt">ALS</span> diagnosis was confirmed. In conclusion, diagnostic timelines in <span class="hlt">ALS</span> are long, and patients see many physicians and receive multiple alternative diagnoses before the diagnosis of <span class="hlt">ALS</span> is confirmed. Older age, sporadic disease, and limb onset can delay <span class="hlt">ALS</span> diagnosis. PMID:24981792</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/24607221','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/24607221"><span id="translatedtitle">Motor neuron death in <span class="hlt">ALS</span>: programmed by astrocytes?</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Pirooznia, Sheila K; Dawson, Valina L; Dawson, Ted M</p> <p>2014-03-01</p> <p>Motor neurons in <span class="hlt">ALS</span> die via cell-autonomous and non-cell-autonomous mechanisms. Using adult human astrocytes and motor neurons, Re et <span class="hlt">al</span>. (2014), in this issue of Neuron, discover that familial and sporadic <span class="hlt">ALS</span>-derived human adult astrocytes secrete neurotoxic factors that selectively kill motor neurons through necroptosis, suggesting a new therapeutic avenue. PMID:24607221</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4040524','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4040524"><span id="translatedtitle">Motor neuron death in <span class="hlt">ALS</span> – programmed by astrocytes?</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Pirooznia, Sheila K.; Dawson, Valina L.; Dawson, Ted M.</p> <p>2014-01-01</p> <p>Motor neurons in <span class="hlt">ALS</span> die via cell-autonomous and non-cell autonomous mechanisms. Using adult human astrocytes and motor neurons, Re et <span class="hlt">al</span> (2014) discover that familial and sporadic <span class="hlt">ALS</span> derived human adult astrocytes secrete neurotoxic factors that selectively kill motor neurons through necroptosis, suggesting a new therapeutic avenue. PMID:24607221</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AIPA....5k7115F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AIPA....5k7115F"><span id="translatedtitle">Screw dislocation-induced growth spirals as emissive exciton localization centers in <span class="hlt">Al</span>-rich <span class="hlt">AlGaN/Al</span>N quantum wells</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Funato, Mitsuru; Banal, Ryan G.; Kawakami, Yoichi</p> <p>2015-11-01</p> <p>Screw dislocations in <span class="hlt">Al</span>-rich <span class="hlt">AlGaN/Al</span>N quantum wells cause growth spirals with an enhanced Ga incorporation, which create potential minima. Although screw dislocations and their surrounding potential minima suggest non-radiative recombination processes within growth spirals, in reality, screw dislocations are not major non-radiative sinks for carriers. Consequently, carriers localized within growth spirals recombine radiatively without being captured by non-radiative recombination centers, resulting in intense emissions from growth spirals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JNuM..399..189A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JNuM..399..189A"><span id="translatedtitle">U-Mo/<span class="hlt">Al</span>-Si interaction: Influence of Si concentration</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Allenou, J.; Palancher, H.; Iltis, X.; Cornen, M.; Tougait, O.; Tucoulou, R.; Welcomme, E.; Martin, Ph.; Valot, C.; Charollais, F.; Anselmet, M. C.; Lemoine, P.</p> <p>2010-04-01</p> <p>Within the framework of the development of low enriched nuclear fuels for research reactors, U-Mo/<span class="hlt">Al</span> is the most promising option that has however to be optimised. Indeed at the U-Mo/<span class="hlt">Al</span> interfaces between U-Mo particles and the <span class="hlt">Al</span> matrix, an interaction layer grows under irradiation inducing an unacceptable fuel swelling. Adding silicon in limited content into the <span class="hlt">Al</span> matrix has clearly improved the in-pile fuel behaviour. This breakthrough is attributed to an U-Mo/<span class="hlt">Al</span>-Si protective layer around U-Mo particles appeared during fuel manufacturing. In this work, the evolution of the microstructure and composition of this protective layer with increasing Si concentrations in the <span class="hlt">Al</span> matrix has been investigated. Conclusions are based on the characterization at the micrometer scale (X-ray diffraction and energy dispersive spectroscopy) of U-Mo7/<span class="hlt">Al</span>-Si diffusion couples obtained by thermal annealing at 450 °C. Two types of interaction layers have been evidenced depending on the Si content in the <span class="hlt">Al</span>-Si alloy: the threshold value is found at about 5 wt.% but obviously evolves with temperature. It has been shown that for Si concentrations ranging from 2 to 10 wt.%, the U-Mo7/<span class="hlt">Al</span>-Si interaction is bi-layered and the Si-rich part is located close to the <span class="hlt">Al</span>-Si for low Si concentrations (below 5 wt.%) and close to the U-Mo for higher Si concentrations. For Si weight fraction in the <span class="hlt">Al</span> alloy lower than 5 wt.%, the Si-rich sub-layer (close to <span class="hlt">Al</span>-Si) consists of U(<span class="hlt">Al</span>, Si) 3 + UMo 2<span class="hlt">Al</span> 20, when the other sub-layer (close to U-Mo) is silicon free and made of UAl 3 and U 6Mo 4<span class="hlt">Al</span> 43. For Si weight concentrations above 5 wt.%, the Si-rich part becomes U 3(Si, <span class="hlt">Al</span>) 5 + U(<span class="hlt">Al</span>, Si) 3 (close to U-Mo) and the other sub-layer (close to <span class="hlt">Al</span>-Si) consists of U(<span class="hlt">Al</span>, Si) 3 + UMo 2<span class="hlt">Al</span> 20. On the basis of these results and of a literature survey, a scheme is proposed to explain the formation of different types of ILs between U-Mo and <span class="hlt">Al</span>-Si alloys (i.e. different protective layers).</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_17 --> <div id="page_18" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="341"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21518326','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21518326"><span id="translatedtitle">Ab initio molecular dynamics of <span class="hlt">Al</span> irradiation-induced processes during <span class="hlt">Al</span>{sub 2}O{sub 3} growth</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Music, Denis; Nahif, Farwah; Friederichsen, Niklas; Schneider, Jochen M.; Sarakinos, Kostas</p> <p>2011-03-14</p> <p><span class="hlt">Al</span> bombardment induced structural changes in {alpha}-<span class="hlt">Al</span>{sub 2}O{sub 3} (R-3c) and {gamma}-<span class="hlt">Al</span>{sub 2}O{sub 3} (Fd-3m) were studied using ab initio molecular dynamics. Diffusion and irradiation damage occur for both polymorphs in the kinetic energy range from 3.5 to 40 eV. However, for {gamma}-<span class="hlt">Al</span>{sub 2}O{sub 3}(001) subplantation of impinging <span class="hlt">Al</span> causes significantly larger irradiation damage and hence larger mobility as compared to {alpha}-<span class="hlt">Al</span>{sub 2}O{sub 3}. Consequently, fast diffusion along {gamma}-<span class="hlt">Al</span>{sub 2}O{sub 3}(001) gives rise to preferential {alpha}-<span class="hlt">Al</span>{sub 2}O{sub 3}(0001) growth, which is consistent with published structure evolution experiments.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2000PhRvB..6112570Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2000PhRvB..6112570Z"><span id="translatedtitle">Electronic structure and bonding properties of layered machinable Ti2<span class="hlt">Al</span>C and Ti2<span class="hlt">Al</span>N ceramics</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhou, Yanchun; Sun, Zhimei</p> <p>2000-05-01</p> <p>The electronic structure and chemical bonding of the layered ternary compounds Ti2<span class="hlt">Al</span>C and Ti2<span class="hlt">Al</span>N have been calculated by the ab initio pseudopotential total-energy method. The results show that Ti2<span class="hlt">Al</span>C and Ti2<span class="hlt">Al</span>N exhibit metallic electrical conductivity with an anisotropic character and Ti2<span class="hlt">Al</span>C should be more conductive than Ti2<span class="hlt">Al</span>N. The chemical bonding in Ti2<span class="hlt">Al</span>C and Ti2<span class="hlt">Al</span>N is also anisotropic and is metallic-covalent-ionic in nature. On the basis of total-energy estimation we conclude that the replacement of C by N will result in a stabilization of the hexagonal structure and decrease in metallic properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JPhCS.683a2015K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JPhCS.683a2015K"><span id="translatedtitle">Analysis of 27<span class="hlt">Al</span>- and 93Nb-NMR spectra of PrNb2<span class="hlt">Al</span>20 single crystal</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kubo, Tetsuro; Kotegawa, Hisashi; Tou, Hideki; Higashinaka, Ryuji; Nakama, Akihiro; Aoki, Yuji; Sato, Hideyuki</p> <p>2016-02-01</p> <p>We report the results of 27<span class="hlt">Al</span>- and 93Nb- nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements in PrNb2<span class="hlt">Al</span>20 single crystals. The field angle dependence of the observed 93Nb-NMR lines for the single crystal at around 5 T and at 50 K is reproduced by a simulation using previously reported NQR parameters νQ,Nb ≈ 1.82 MHz and ηNb ≈ 0, while 27<span class="hlt">Al</span>-NMR lines were not reproduce by the previously reported NQR parameters νQ,<span class="hlt">Al</span>(3) ≈ 1.53 MHz and η<span class="hlt">Al</span>(3) ≈ 0.17. By reexamining and reconsidering the NMR and NQR lines for powder samples, we obtained a correct NQR parameters for <span class="hlt">Al</span>(3) site to be νQ,<span class="hlt">Al</span>(3),new ≈ 1 MHz and η<span class="hlt">Al</span>(3),new ≈ 0.4.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1997PhDT.......204K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1997PhDT.......204K"><span id="translatedtitle">The structure and mechanical properties of <span class="hlt">Al</span> and <span class="hlt">Al-Al</span>(2)O(3) microlaminate films synthesized by ion beam-assisted deposition</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kalnas, Christine Elaine</p> <p>1997-09-01</p> <p>The effects of the constituent <span class="hlt">Al</span> and Alsb2Osb3 layer properties, as modified by ion beam assisted deposition (IBAD), on the fracture behavior of <span class="hlt">Al</span>-Alsb2Osb3 microlaminate films were analyzed. Residual stress in monolithic <span class="hlt">Al</span> and Alsb2Osb3 films could be tailored by proper control of the R-ratio (ion to atom arrival rate ratio) and Esbn (ion energy deposited per atom, eV/atom). Residual stress in microlaminate films could be controlled by adjusting the deposition parameters of the individual layers because the stress followed a rule of mixtures. Alsb2Osb3 films exhibited a transition from tensile to compressive stress with increasing Esbn. <span class="hlt">Al</span> films exhibited a tensile residual stress over the entire range of Esbn from 0 to 50 eV/atom. Fracture behaviors of Alsb2Osb3 films and <span class="hlt">Al</span>-Alsb2Osb3 microlaminate films were assessed by deformation of films deposited on ductile substrates. The true fracture strain of both PVD and IBAD (R = 0.1), 5-bilayer microlaminate films increased with decreasing magnitude of residual stress as the volume fraction of <span class="hlt">Al</span> was increased from 0.20 to 0.55. Critical strain energy release rates, calculated from the experiments, for two IBAD R = 0.02 Alsb2Osb3 films indicated that differences in the strain energy release rates by a factor of 2 are not significant. The role of the <span class="hlt">Al</span> layer on microlaminate fracture was analyzed in trilayer films with near zero residual film stress. Critical strain energy release rates for all trilayer films were similar (6-14 J/msp2); there was no effect of the <span class="hlt">Al</span> layer processing or mixing at the interfaces. However, the effects of IBAD on the structure and mechanical properties of 500 nm thick <span class="hlt">Al</span> films were significant. Mean grain size of IBAD <span class="hlt">Al</span> was 120 nm compared with a mean grain size of 260 nm for IBAD <span class="hlt">Al</span>. 0.2% offset yield strengths of both films were similar (˜180 GPa). IBAD <span class="hlt">Al</span> exhibited a region of increased work-hardening compared to PVD <span class="hlt">Al</span>, albeit a decreased mean elongation to fracture. PVD <span class="hlt">Al</span> failed by necking to a point, while the IBAD <span class="hlt">Al</span> exhibited intergranular fracture. Differences in grain boundary character between PVD and IBAD may be responsible for both the reduced ductility and the intergranular fracture in IBAD <span class="hlt">Al</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JAP...117k5702I','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JAP...117k5702I"><span id="translatedtitle">Co-existence of a few and sub micron inhomogeneities in <span class="hlt">Al</span>-rich <span class="hlt">AlGaN/Al</span>N quantum wells</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Iwata, Yoshiya; Oto, Takao; Gachet, David; Banal, Ryan G.; Funato, Mitsuru; Kawakami, Yoichi</p> <p>2015-03-01</p> <p>Inhomogeneity in <span class="hlt">Al</span>-rich <span class="hlt">AlGaN/Al</span>N quantum wells is directly observed using our custom-built confocal microscopy photoluminescence (?-PL) apparatus with a reflective system. The ?-PL system can reach the <span class="hlt">Al</span>N bandgap in the deep ultra-violet spectral range with a spatial resolution of 1.8 ?m. In addition, cathodoluminescence (CL) measurements with a higher spatial resolution of about 100 nm are performed. A comparison of the ?-PL and CL measurements reveals that inhomogeneities, which have different spatial distributions of a few- and sub-micron scales that are superimposed, play key roles in determining the optical properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009APS..SHK.B5002B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009APS..SHK.B5002B"><span id="translatedtitle">Constitutive Model Constants for <span class="hlt">Al</span>7075-T651 and <span class="hlt">Al</span>7075-T6</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Brar, Nachhatter; Joshi, Vasant; Harris, Bryan</p> <p>2009-06-01</p> <p>Aluminum 7075-T651 and 7075-T6 are characterized at quasi-static and high strain rates to determine Johnson-Cook (J-C) strength and fracture model constants. Constitutive model constants are required as input to computer codes to simulate projectile (fragment) impact or similar impact events on structural components made of these material. J-C strength model constants (A, B, n, C, and m) for the two alloys are determined from tension stress-strain data at room and high temperature to 250^oC. J-C strength model constants for <span class="hlt">Al</span>7075-T651 are: A=527 MPa, B=676 MPa, n=0.71, C=0.017, and m=1.61 and for <span class="hlt">Al</span>7075-T6: A = 546 MPa, B = 674 MPa, n = 0.72, C = 0.059, and m =1.56. J-C fracture model constants are determined form quasi-static and high strain rate/high temperature tests on notched and smooth tension specimens. J-C fracture model constants for the two alloys are: <span class="hlt">Al</span>7075-T651; D1 = 0.110, D2 = 0.573, D3= -3.4446, D4 = 0.016, and D 5= 1.099 and <span class="hlt">Al</span>7075-T6; D1= 0.451 D2= -0.952 D3= -.068, D4 =0.036, and D5 = 0.697.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20000030652','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20000030652"><span id="translatedtitle">Cyclic Oxidation of FeCr<span class="hlt">AlY/Al</span>2O3 Composites</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Nesbitt, James A.; Draper, Susan L.; Barrett, Charles A.</p> <p>1999-01-01</p> <p>Three-ply FeCr<span class="hlt">AlY/Al</span>2O3 composites and FeCr<span class="hlt">Al</span>Y matrix-only samples were cyclically oxidized at 1000 C and 1100 C for up to 1000 1-hr cycles. Fiber ends were exposed at the ends of the composite samples. Following cyclic oxidation, cracks running parallel to and perpendicular to the fibers were observed on the large surface of the composite. In addition, there was evidence of increased scale damage and spallation around the exposed fiber ends, particularly around the middle ply fibers. This damage was more pronounced at the higher temperature. The exposed fiber ends showed cracking between fibers in the outer plies, occasionally with Fe and Cr-rich oxides growing out of the cracks. Large gaps developed at the fiber/matrix interface around many of the fibers, especially those in the outer plies. Oxygen penetrated many of these gaps resulting in significant oxide formation at the fiber/matrix interface far within the composite sample. Around several fibers, the matrix was also internally oxidized showing <span class="hlt">Al</span>2O3 precipitates in a radial band around the fibers. The results show that these composites have poor cyclic oxidation resistance due to the CTE mismatch and inadequate fiber/matrix bond strength at temperatures of 1000 C and above.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/897563','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/897563"><span id="translatedtitle">Magnetization anomaly of Nb3<span class="hlt">Al</span> strands and instability of Nb3<span class="hlt">Al</span> Rutherford cables</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Yamada, Ryuji; Kikuchi, Akihiro; Wake, Masayoshi; /KEK, Tsukuba</p> <p>2006-08-01</p> <p>Using a Cu stabilized Nb{sub 3}<span class="hlt">Al</span> strand with Nb matrix, a 30 meter long Nb{sub 3}<span class="hlt">Al</span> Rutherford cable was made by a collaboration of Fermilab and NIMS. Recently the strand and cable were tested. In both cases instability was observed at around 1.5 Tesla. The magnetization of this Nb{sub 3}<span class="hlt">Al</span> strand was measured first using a balanced coil magnetometer at 4.2 K. Strands showed an anomalously large magnetization behavior around at 1.6 T, which is much higher than the usual B{sub c2} {approx} 0.5 Tesla (4.2 K) of Nb matrix. This result is compared with the magnetization data of short strand samples using a SQUID magnetometer, in which a flux-jump signal was observed at 0.5 Tesla, but not at higher field. As a possible explanation for this magnetization anomaly, the interfilament coupling through the thin Nb films in the strands is suggested. The instability problem observed in low field tests of the Nb{sub 3}<span class="hlt">Al</span> Rutherford cables is attributed to this effect.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JEMat..44..194K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JEMat..44..194K"><span id="translatedtitle">Structural, Optical, and Electrical Characterization of <span class="hlt">Al</span>/ n-ZnO/ p-Si/<span class="hlt">Al</span> Heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kumar, Rajender; Chand, Subhash</p> <p>2015-01-01</p> <p>For heterojunction fabrication, zinc oxide thin films were grown on p-Si by pulsed laser deposition. X-ray diffraction patterns were used to study the grain size and morphology of the films. The optical properties of the films were studied by UV-visible and photoluminescence spectroscopy. Experimental observations confirmed that the deposited films have potential for sharp emission in the visible region. High-purity (99.999%) vacuum evaporated aluminium metal was used to make contacts to the n-ZnO and p-Si. The current-voltage characteristics of the <span class="hlt">Al</span>/ n-ZnO/ p-Si(100)/<span class="hlt">Al</span> heterostructure measured over the temperature range 60-300 K were studied on the basis of the thermionic emission diffusion mechanism. The equivalent Schottky barrier height and the diode ideality factor were determined by fitting measured current-voltage data to the thermionic emission diffusion equation. It was observed that the barrier height decreased and the ideality factor increased with decreasing temperature, and that the activation energy plot was non-linear at low temperature. These characteristics are attributed to the Gaussian distribution of barrier heights. The capacitance-voltage characteristics of the <span class="hlt">Al</span>/ n-ZnO/ p-Si(100)/<span class="hlt">Al</span> heterostructure diode were studied over a wide temperature range. The impurity concentration in deposited n-type ZnO films was estimated from measured capacitance-voltage data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940011519','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940011519"><span id="translatedtitle">A sulfur segregation study of PWA 1480, NiCr<span class="hlt">Al</span>, and Ni<span class="hlt">Al</span> alloys</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Jayne, D. T.; Smialek, J. L.</p> <p>1993-01-01</p> <p>Some nickel based superalloys show reduced oxidation resistance from the lack of an adherent oxide layer during high temperature cyclic oxidation. The segregation of sulfur to the oxide-metal interface is believed to effect oxide adhesion, since low sulfur alloys exhibit enhanced adhesion. X ray Photoelectron Spectroscopy (XPS) was combined with an in situ sample heater to measure sulfur segregation in NiCr<span class="hlt">Al</span>, PWA 1480, and Ni<span class="hlt">Al</span> alloys. The polished samples with a 1.5 to 2.5 nm (native) oxide were heated from 650 to 1100 C with hold times up to 6 hr. The sulfur concentration was plotted as a function of temperature versus time at temperature. One NiCr<span class="hlt">Al</span> sulfur study was performed on the same casting used by Browning to establish a base line between previous Auger Electron Spectroscopy (AES) results and the XPS results of this study. Sulfur surface segregation was similar for PWA 1480 and NiCr<span class="hlt">Al</span> and reached a maximum of 30 at% at 800 to 850 C. Above 900 C the sulfur surface concentration decreased to about 3 at% at 1100 C. These results are contrasted to the minimal segregation observed for low sulfur hydrogen annealed materials which exhibit improved scale adhesion.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20442029','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20442029"><span id="translatedtitle">Guided lamb wave electroacoustic devices on micromachined <span class="hlt">AlN/Al</span> plates.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Di Pietrantonio, Fabio; Benetti, Massimiliano; Cannatà, Domenico; Beccherelli, Romeo; Verona, Enrico</p> <p>2010-05-01</p> <p>An electroacoustic micro-device based on the propagation of guided acoustic Lamb waves in <span class="hlt">AlN/Al</span> plate is described. The <span class="hlt">Al</span>N thin film is deposited by sputtering technique, optimized to achieve a high degree of orientation (rocking curve full-width at half-maximum /sp lap/ 3.5 degrees ) of the c-axis perpendicular to the plate surface. The <span class="hlt">Al</span>N plate is micromachined using anisotropic reactive ion etching (RIE), followed by isotropic RIE to remove the silicon underlayer. Simulation results for the dispersion phase velocity curves and the electromechanical coupling coefficient (K(2)) are obtained by the matrix method and by the finite element method and compared with experimental data. A delay line is implemented on the structure and tested for the propagation of the first symmetrical Lamb mode (s(0)) at the frequency of 1.22 GHz. Measurements have shown that the structure is suitable for implementation of arrays of electroacoustic devices on a single chip for application to both sensing devices and signal processing systems. PMID:20442029</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/pages/biblio/1239365-electronic-transport-through-al-inn-nanowire-al-junctions','SCIGOV-DOEP'); return false;" href="http://www.osti.gov/pages/biblio/1239365-electronic-transport-through-al-inn-nanowire-al-junctions"><span id="translatedtitle">Electronic transport through <span class="hlt">Al</span>/InN nanowire/<span class="hlt">Al</span> junctions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGESBeta</a></p> <p>Lu, Tzu -Ming; Wang, George T.; Pan, Wei; Zhao, S.; Mi, Z.</p> <p>2016-02-10</p> <p>We report non-linear electronic transport measurement of <span class="hlt">Al</span>/Si-doped n-type InN nanowire/<span class="hlt">Al</span> junctions performed at T = 0.3 K, below the superconducting transition temperature of the <span class="hlt">Al</span> electrodes. The proximity effect is observed in these devices through a strong dip in resistance at zero bias. In addition to the resistance dip at zero bias, several resistance peaks can be identified at bias voltages above the superconducting gap of the electrodes, while no resistance dip is observed at the superconducting gap. The resistance peaks disappear as the <span class="hlt">Al</span> electrodes turn normal beyond the critical magnetic field except one which remains visible atmore » fields several times higher than critical magnetic field. An unexpected non-monotonic magnetic field dependence of the peak position is observed. As a result, we discuss the physical origin of these observations and propose that the resistance peaks could be the McMillan-Rowell oscillations arising from different closed paths localized near different regions of the junctions.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19990021236','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19990021236"><span id="translatedtitle">High Temperature Mechanical Characterization and Analysis of <span class="hlt">Al</span>2O3 /<span class="hlt">Al</span>2O3 Composition</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Gyekenyesi, John Z.; Jaskowiak, Martha H.</p> <p>1999-01-01</p> <p>Sixteen ply unidirectional zirconia coated single crystal <span class="hlt">Al</span>2O3 fiber reinforced polycrystalline <span class="hlt">Al</span>2O3 was tested in uniaxial tension at temperatures to 1400 C in air. Fiber volume fractions ranged from 26 to 31%. The matrix has primarily open porosity of approximately 40%. Theories for predicting the Young's modulus, first matrix cracking stress, and ultimate strength were applied and evaluated for suitability in predicting the mechanical behavior of <span class="hlt">Al</span>2O3/<span class="hlt">Al</span>2O3 composites. The composite exhibited pseudo tough behavior (increased area under the stress/strain curve relative to monolithic alumina) from 22 to 1400 C. The rule-of-mixtures provides a good estimate of the Young's modulus of the composite using the constituent properties from room temperature to approximately 1200 C for short term static tensile tests in air. The ACK theory provides the best approximation of the first matrix cracking stress while accounting for residual stresses at room temperature. Difficulties in determining the fiber/matrix interfacial shear stress at high temperatures prevented the accurate prediction of the first matrix cracking stress above room temperature. The theory of Cao and Thouless, based on Weibull statistics, gave the best prediction for the composite ultimate tensile strength.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/18232674','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/18232674"><span id="translatedtitle">Photoelectron spectroscopy and Ab initio study of the structure and bonding of <span class="hlt">Al</span>7N- and <span class="hlt">Al</span>7N.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Averkiev, Boris B; Call, Seth; Boldyrev, Alexander I; Wang, Lei-Ming; Huang, Wei; Wang, Lai-Sheng</p> <p>2008-03-01</p> <p>The electronic and geometrical structures of <span class="hlt">Al</span>7N- are investigated using photoelectron spectroscopy and ab initio calculations. Photoelectron spectra of <span class="hlt">Al</span>7N- have been obtained at three photon energies with six resolved spectral features at 193 nm. The spectral features of <span class="hlt">Al</span>7N- are relatively broad, in particular for the ground state transition, indicating a large geometrical change from the ground state of <span class="hlt">Al</span>7N- to that of <span class="hlt">Al</span>7N. The ground state vertical detachment energy is measured to be 2.71 eV, whereas only an upper limit of approximately 1.9 eV can be estimated for the ground state adiabatic detachment energy due to the broad detachment band. Global minimum searches for A7N- and <span class="hlt">Al</span>7N are performed using several theoretical methods. Vertical electron detachment energies are calculated using three different methods for the lowest energy structure and compared with the experimental data. Calculated results are in excellent agreement with the experimental data. The global minimum structure of <span class="hlt">Al</span>7N- is found to possess C3v symmetry, which can be viewed as an <span class="hlt">Al</span> atom capping a face of a N-centered <span class="hlt">Al</span>6N octahedron. In the ground state of <span class="hlt">Al</span>7N, however, the capping <span class="hlt">Al</span> atom is pushed inward with the three adjacent <span class="hlt">Al-Al</span> distances being stretched outward. Thus, even though <span class="hlt">Al</span>7N still possesses C3v symmetry, it is better viewed as a N-coordinated by seven <span class="hlt">Al</span> atoms in a cage-like structure. The chemical bonding in <span class="hlt">Al</span>7N- is discussed on the basis of molecular orbital and natural bond analysis. PMID:18232674</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/197802','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/197802"><span id="translatedtitle">An elliptical wiggler beamline for the <span class="hlt">ALS</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Martynov, V.V. |; McKinney, W.R.; Padmore, H.A.</p> <p>1995-10-01</p> <p>A beamline for circularly polarized radiation produced by an elliptical wiggler has been designed at the <span class="hlt">ALS</span> covering the broad energy range from 50 eV to 2000 eV. The rigorous theory of grating diffraction efficiency has been used to maximize transmitted flux. The nature of the elliptical wiggler insertion device creates a challenging optical problem due to the large source size in the vertical and horizontal directions. The requirement of high resolving power, combined with the broad tuning range and high heat loads complicate the design. These problems have been solved by using a variable included angle monochromator of the ``constant length`` type with high demagnification onto its entrance slit, and cooled optics.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015APS..MARM14006N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015APS..MARM14006N"><span id="translatedtitle"><span class="hlt">Al</span> Nanowire Arrays For Plasmonic Devices</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nesbitt, Nathan T.; Rose, Aaron H.; Calm, Yitzi M.; Merlo, Juan M.; Shepard, Steve; McMahon, Greg; Tsung, Chia-Kuang; Burns, Michael J.; Naughton, Michael J.</p> <p>2015-03-01</p> <p>Aluminum nanowires have been fabricated in ordered vertical arrays on bulk <span class="hlt">Al</span> foil with controlled wire dimensions and spacing. Large aspect ratio wires were obtained, including sub-micron wire diameters and supra-10 ?m height. The somewhat novel method of fabrication utilizes nanoimprint lithography and the economical electrochemical anodization process used to make anodized aluminum oxide (AAO) templates, suggesting potential facile production and scalability. To our knowledge, arrays of vertical metallic nanowires (i.e. differing from semiconductor nanowire or carbon nanofiber arrays) of the obtained dimensions have not previously been reported. These dimensions may be favorable for nanoscale photonic and plasmonic transmission, nanocoax solar cells, and non-diffaction-limited optical microscopy. This material is based upon work supported by the National Science Foun- dation Graduate Research Fellowship under Grant No. (DGE-1258923).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20104681','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20104681"><span id="translatedtitle">Cavity nucleation in <span class="hlt">Al</span> 5083 alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Chandra, N.; Chen, Z.</p> <p>2000-07-01</p> <p>In this paper the authors address the controversial issue of nucleation of cavities in <span class="hlt">Al</span> 5083 alloys. They focus on the origin of cavities during the manufacture of these alloys into SPF (superplastic forming) sheet form. Experimental observations on the pre-existing cavities in this alloy are made using optical and electron microscopy. The effects of rolling direction and state of stress during superplastic deformations on the formation of cavities are also discussed. Numerical simulations of the sheet manufacturing process are carried out to understand the effect of hard phase/matrix, mechanical properties and interfacial strength on the origin of cavities. Based on the numerical results, a simplified model relating the process, material parameters and the cavity nucleation is presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1999MMTA...30..335A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1999MMTA...30..335A"><span id="translatedtitle">Cavitation erosion of Ni<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Akhtar, A.; Salvi, R.; Sikka, V. K.</p> <p>1999-02-01</p> <p>Vibratory cavitation erosion tests were carried out on as-cast Ni<span class="hlt">Al</span> intermetallic compounds containing 46.5 to 62.1 at pct Ni. The erosion rate decreased with increasing nickel content by over two orders of magnitude, from a high of 16.4 to 0.11 mg·h-1. These low erosion rates exhibited by the nickel-rich alloys containing 58 and 62.1 at. pct Ni, the interruptions in their mass loss with time, and the unusual effects associated with surface finish and intensity of cavitation were found to be associated with the stress-induced martensitic transformation. Alloys containing 58 to 62 at. pct Ni have the potential for use as materials for the cavitation protection of hydraulic machinery.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009Nanot..20b5611W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009Nanot..20b5611W"><span id="translatedtitle">Single-crystal <span class="hlt">Al</span>N nanonecklaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, Huatao; Xie, Zhipeng; Wang, Yiguang; Yang, Weiyou; Zeng, Qingfeng; Xing, Feng; An, Linan</p> <p>2009-01-01</p> <p>Distinct single-crystal aluminum nitride nanonecklaces with uniform \\{10\\bar {1}1\\} faceted beads are synthesized via catalyst-assisted nitriding of <span class="hlt">Al</span>. The detailed morphology and structure of the nanonecklaces have been characterized. The growth process has been investigated by comparing the products obtained at different synthesis times. The results reveal that the formation of the nanonecklaces is via a process consisting of facet formation and bead unification. The formation of the \\{10\\bar {1}1\\} facets is due to the presence of a liquid phase that lowers the surface tension of otherwise high-energy \\{10\\bar {1}1\\} planes. The bead unification is driven by minimizing the energy contributed by surface energy and electrostatic energy. The unique morphology of the nanonecklaces could be useful for studying fundamental physical phenomena and fabricating nanodevices.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1997PhDT.......109A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1997PhDT.......109A"><span id="translatedtitle">NMR study and hardness behavior of nanophase <span class="hlt">Al/Al</span>-oxide consolidated composite</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Apte, Palash Prakash</p> <p></p> <p>Over the past few years, nanostructured materials (grain sizes 1-100 nm) have generated a lot of interest in the scientific community. This interest has mainly stemmed from the reported superior properties of these materials over conventional ones and their potential for commercial applications. A variety of techniques including SEM, TEM, PAS, etc. have been used to study nanophase materials. This work reports the study of a nanophase composite material using the non-destructive NMR spectroscopic technique. The composite studied is a nanophase <span class="hlt">Al/Al</span>-Oxide system with the <span class="hlt">Al</span> metal in the grains and the <span class="hlt">Al</span>-Oxide in the grain boundaries. The production of such a nanoscale <span class="hlt">Al/Al</span>-Oxide powder is described. Hardness, mass density and electrical conductivity measurements on the pellets formed by the consolidation of this powder at different consolidation pressures is reported. NMR studies of this composite material are reported at room temperature. The design and construction of a high temperature NMR probe is described. Limited high temperature NMR measurements are then described. Hardness measurements conducted on the samples indicate an increase in hardness with decrease in grain size in accordance with the Hall-Petch relationship. Interestingly, some of the samples were electrically conducting and some non-conducting. An increase in hardness with an insignificant change in mass density was observed in some samples. High temperature NMR results indicate the melting of the <span class="hlt">Al</span> metal within the oxide at or around the melting point of aluminum (660sp°C). X-Ray measurements show no evidence of grain growth with increase in temperature. Both the X-Ray and NMR measurements show a substantial increase in the aluminum-oxide content of the samples after heating. NMR measurements performed on the samples before and after heating show a non-reversible behavior of the samples upon heating with respect to their signal intensity. Hardness tests performed on the samples after heating them indicate an increase in hardness by as much as a factor of five as compared to the hardness of the unheated samples. In conclusion, the experiments have successfully demonstrated the synthesis of a unique nanophase low density, high strength composite material capable of retaining its superior properties even above the melting point of aluminum.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_18 --> <div id="page_19" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="361"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26803101','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26803101"><span id="translatedtitle">Assessment of the Heavy Metals in <span class="hlt">Al</span> Asfar Lake, <span class="hlt">Al</span>-Hassa, Saudi Arabia.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hussein, Adel H A; El Mahmoudi, Ahmed S; Al Naeem, Ahmed A</p> <p>2016-01-01</p> <p><span class="hlt">Al</span> Asfar Lake is a shallow wetland and habitat for wildlife and birds in a desert environment. The water of this lake is originated from the drainage water collected by earthen drainage network and discharged into the lake. The purpose of this study was to assess physico- chemical characteristics and some of heavy metals in <span class="hlt">Al</span> Asfar lake water. The studied parameters are iron, manganese, copper, zinc, cadmium, chromium, lead, pH, electrical conductivity, and nitrate. Forty-five surface water samples were collected in March 2013. The results revealed that the pH ranged from 7.33 to 8.67, electrical conductivity ranged from 8.28 to 11.34 dS/m, and NO3(-) ranged from 0.84 to 2.29 mg/L. In addition, heavy metals concentrations in water were found in the following order: Fe > Mn > Cu > Zn > Cd > Cr = Pb. The mean concentrations of heavy metals in surface water of <span class="hlt">Al</span> Asfar lake ranged from 0.027 to 0.159 ppm, 0.007 to 0.142 ppm, 0.005 to 0.017 ppm, 0.005 to 0.066 ppm, 0.001 to 0.033 ppm, 0 ppm, and 0 ppm for iron, manganese, copper, zinc, cadmium, chromium, and lead, respectively. Moreover, pH, NO3(-), Fe, Mn, and Zn concentrations in the surface water of <span class="hlt">Al</span> Asfar Lake were found to be within the international permissible limits. On the other hand, Cu and Cd concentrations exceeded the international permissible limits. The high level of some parameters of the measured heavy metals could be attributed to the contamination of <span class="hlt">Al</span> Asfar Lake with discharge water enriched with chemical fertilizers in addition to domestic and industrial effluents. PMID:26803101</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/348927','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/348927"><span id="translatedtitle">Surface structures of <span class="hlt">Al</span>-Pd-Mn and <span class="hlt">Al</span>-Cu-Fe icosahedral quasicrystals</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Shen, Z.</p> <p>1999-02-12</p> <p>In this dissertation, the author reports on the surface structure of i-<span class="hlt">Al</span>-Pd-Mn twofold, threefold, fivefold and i-<span class="hlt">Al</span>-Cu-Fe fivefold surfaces. The LEED studies indicate the existence of two distinct stages in the regrowth of all four surfaces after Ar{sup +} sputtering. In the first stage, upon annealing at relatively low temperature: 500K--800K (depending on different surfaces), a cubic phase appears. The cubic LEED patterns transform irreversibly to unreconstructed quasicrystalline patterns upon annealing to higher temperatures, indicating that the cubic overlayers are metastable. Based upon the data for three chemically-identical, but symmetrically-inequivalent surfaces, a model is developed for the relation between the cubic overlayers and the quasicrystalline substrate. The model is based upon the related symmetries of cubic close-packed and icosahedral-packed materials. These results may be general among <span class="hlt">Al</span>-rich, icosahedral materials. STM study of <span class="hlt">Al</span>-Pd-Mn fivefold surface shows that terrace-step-kink structures start to form on the surface after annealing above 700K. Large, atomic ally-flat terraces were formed after annealing at 900K. Fine structures with fivefold icosahedral symmetry were found on those terraces. Data analysis and comparison of the STM images and structure model of icosahedral <span class="hlt">Al</span>-Pd-Mn suggest that the fine structures in the STM images may be the pseudo Mackay (PMI) clusters which are the structure units of the structure model. Based upon his results, he can conclude that quasicrystalline structures are the stable structures of quasicrystal surfaces. In other words, quasicrystalline structures extend from the bulk to the surface. As a result of the effort reported in this dissertation, he believes that he has increased his understanding of the surface structure of icosahedral quasicrystals to a new level.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6433498','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6433498"><span id="translatedtitle">Infiltration of Saffil alumina fiber with <span class="hlt">Al</span>Cu and <span class="hlt">Al</span>Si alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Garbellini, O.; Morando, C.; Biloni, H.; Palacio, H. . Inst. de Fisica de Materiales)</p> <p>1999-06-18</p> <p>Currently there is a considerable scientific and technological interest in the composite materials, which a strong ceramic reinforcement is incorporated into a metal matrix (MMC) to tailor its properties for specific applications. Among the various techniques for fabricating MMC, the liquid metal infiltration process by means of a pressurized gas is an attractive fabrication route for near net shaped metal matrix composite and has been successfully used to fabricate <span class="hlt">Al</span>, Mg and more recently, Ni and Ni aluminide matrix composites, which can be reinforced by SiC or <span class="hlt">Al</span>[sub 2]O[sub 3] particles, whiskers, or short fibers. This paper describes the experimental technique used and presents an experimental investigation of the effects of the process parameters employed, such as the preform and melt temperatures, the volume fraction of fibers in the preform and the applied pressure upon the infiltration length of a chopped preform during a unidirectional infiltration aided by gas pressure casting. The experiments of the present work were conducted to provide kinetic data with a view to optimizing the selection of the process initial conditions for infiltration which have an effect on the infiltration length of the molten matrix alloy into a preform and it is a first step in investigating the correlation between the infiltration length (fluidity) of <span class="hlt">Al</span>CuSi matrix alloys and the microstructure of the composites fabricated by pressure casting. For this purpose, this paper focuses on <span class="hlt">Al</span>Cu and <span class="hlt">Al</span>Si matrix alloys reinforced by short-fibers [delta]-alumina SAFFIL. The experiments reported here were performed with the fibers initially at a temperature significantly below the metal melting point. This is the case of practical interest for the fabrication of many fiber-reinforced metal components.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23043345','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23043345"><span id="translatedtitle">Removal of phosphate from water using six <span class="hlt">Al</span>-, Fe-, and <span class="hlt">Al</span>-Fe-modified bentonite adsorbents.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Shanableh, Abdallah M; Elsergany, Moetaz M</p> <p>2013-01-01</p> <p>This study was part of a larger effort that involves evaluating alternatives to upgrading secondary treatment systems in the United Arab Emirates for the removal of nutrients. In this study, six modified bentonite (BNT) phosphate adsorbents were prepared using solutions that contained hydroxy-polycations of aluminum (<span class="hlt">Al</span>-BNT), iron (Fe-BNT), and mixtures of aluminum and iron (<span class="hlt">Al</span>-Fe-BNT). The adsorption kinetics and capacities of the six adsorbents were evaluated, and the adsorbents were used to remove phosphorus from synthetic phosphate solutions and from treated wastewater. The experimental adsorption kinetics results were well represented by the pseudo-second-order kinetic model, with R(2) values ranging from 0.99 to 1.00. Similarly, the experimental equilibrium adsorption results were well represented by the Freundlich and Langmuir isotherms, with R(2) values ranging from 0.98 to 1.00. The adsorption capacities of the adsorbents were dependent on the BNT preparation conditions; the types, quantities and combination of metals used; BNT particle size; and adsorption pH. The Langmuir maximum adsorption capacities of the six adsorbents ranged from 8.9-14.5 mg P/g-BNT. The results suggested that the BNT preparations containing Fe alone or in combination with <span class="hlt">Al</span> achieved higher adsorption capacities than the preparations containing only <span class="hlt">Al</span>. However, the <span class="hlt">Al</span>-BNT preparations exhibited higher adsorption rates than the Fe-BNT preparation. Three of the six adsorbents were used to remove phosphate from secondarily treated wastewater samples, and the removal results were comparable to those obtained using synthetic phosphate solutions. The BNT adsorbents also exhibited adequate settling characteristics and significant regeneration potential. PMID:23043345</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JMEP...23.2877S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JMEP...23.2877S"><span id="translatedtitle">Metallurgical Characteristics of Ti<span class="hlt">AlN/Al</span>CrN Coating Synthesized by the PVD Process on a Cutting Insert</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sampath Kumar, T.; Balasivanandha Prabu, S.; Manivasagam, Geetha</p> <p>2014-08-01</p> <p>Ti<span class="hlt">AlN/Al</span>CrN coating was deposited on a tungsten carbide insert, using the plasma-enhanced physical vapor deposition (PEPVD) process. The microstructure of the coating was examined and it was found that the Ti<span class="hlt">AlN/Al</span>CrN coating was uniform, highly dense, and less porous. The different phases formed in the coating were analyzed using the x-ray diffraction. The hardness and scratch resistance were measured using the nanoindentation tester and scratch tester, respectively. Ti<span class="hlt">AlN/Al</span>CrN exhibited higher hardness, higher Young's modulus, and superior scratch resistance when compared to the conventional coatings, such as Ti<span class="hlt">Al</span>N, <span class="hlt">Al</span>CrN, and TiN. The surface morphology of the coating was characterized using the atomic force microscope (AFM). The surface roughness was found to be lesser in the Ti<span class="hlt">AlN/Al</span>CrN coating. The Ti<span class="hlt">AlN/Al</span>CrN coating has proved to have better corrosion resistance, compared to the uncoated carbide substrate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015ApSS..326..174Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015ApSS..326..174Z"><span id="translatedtitle">Catalytic effect of <span class="hlt">Al</span> and <span class="hlt">Al</span>N interlayer on the growth and properties of containing carbon films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhou, Bing; Liu, Zhubo; Tang, Bin; Rogachev, A. V.</p> <p>2015-01-01</p> <p>Diamond-like carbon (DLC) and carbon nitride (CNx) bilayer films with <span class="hlt">Al</span> and <span class="hlt">Al</span>N interlayer were fabricated by pulse cathode arc technique. The structure, composition, morphology and mechanical properties of the films were investigated by Raman, Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), Knoop sclerometer and surface profilometer. The results indicated that the complete diffusion between C and <span class="hlt">Al</span> atoms occurs in the <span class="hlt">Al</span>/DLC and <span class="hlt">Al</span>/CNx bilayer. <span class="hlt">Al</span> interlayer induces the increase of the size and ordering of Csp2 clusters in the films but <span class="hlt">Al</span>N interlayer increases the disordering degree of Csp2 clusters. XPS results showed that a higher content of Csp3/Csp2 bonds presents in the <span class="hlt">Al</span>/CNx bilayer, and <span class="hlt">Al</span> and <span class="hlt">Al</span>N interlayer decreases the atomic ratio of N/C. AFM with phase contrast mode illustrated the morphologic characteristics of the bilayer films. All the bilayers show a nano-structural surface. The morphology changes of the bilayer were well explained by the surface state of the substrate and the growth mechanism of DLC films. The hardness of <span class="hlt">Al</span>/DLC bilayer decreases but it increases for the other bilayers compared to the corresponding DLC (CNx) monolayer. The internal stress of the bilayer is significantly lower than that of the monolayer except for the <span class="hlt">Al</span>N/CNx bilayer. These studies could make the difference at the time of choosing a suitable functional film for certain application.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1023304','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1023304"><span id="translatedtitle">Creep in Directionally Solidified Ni<span class="hlt">Al</span>-Mo Eutectics</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Dudova, Marie; Kucharova, Kveta; Bartak, Tomas; Bei, Hongbin; George, Easo P; Somsen, Ch.; Dlouhy, A.</p> <p>2011-01-01</p> <p>A directionally solidified Ni<span class="hlt">Al</span>-Mo eutectic and an Ni<span class="hlt">Al</span> intermetallic, having respective nominal compositions Ni-45.5<span class="hlt">Al</span>-9Mo and Ni-45.2<span class="hlt">Al</span> (at.%), were loaded in compression at 1073 and 1173 K. Formidable strengthening by regularly distributed Mo fibres (average diameter 600 nm, volume fraction 14%) was observed. The fibres can support compression stresses transferred from the plastically deforming matrix up to a critical stress of the order of 2.5 GPa, at which point they yield. Microstructural evidence is provided for the dislocation-mediated stress transfer from the Ni<span class="hlt">Al</span> to the Mo phase.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/22183686','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/22183686"><span id="translatedtitle">Crystal structure of novel compounds in the systems Zr-Cu-<span class="hlt">Al</span>, Mo-Pd-<span class="hlt">Al</span> and partial phase equilibria in the Mo-Pd-<span class="hlt">Al</span> system.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Khan, Atta U; Rogl, P; Giester, G</p> <p>2012-02-28</p> <p>The crystal structures of three <span class="hlt">Al</span>-rich compounds have been solved from X-ray single crystal diffractometry: ?(1)-MoPd(2-x)<span class="hlt">Al</span>(8+x) (x = 0.067); ?(7)-Zr(Cu(1-x)<span class="hlt">Al</span>(x))(12) (x = 0.514) and ?(9)-ZrCu(1-x)<span class="hlt">Al</span>(4) (x = 0.144). ?(1)-MoPd(2-x)<span class="hlt">Al</span>(8+x) adopts a unique structure type (space group Pbcm; lattice parameters a = 0.78153(2), b = 1.02643(3) and c = 0.86098(2) nm), which can be conceived as a superstructure of the Mo(Cu(x)<span class="hlt">Al</span>(1-x))(6)<span class="hlt">Al</span>(4) type. Whereas Mo-atoms occupy the 4d site, Pd(2) occupies the 4c site, <span class="hlt">Al</span> and Pd(1) atoms randomly share the 4d position and the rest of the positions are fully occupied by <span class="hlt">Al</span>. A Bärnighausen tree documents the crystallographic group-subgroup relation between the structure types of Mo(Cu(x)<span class="hlt">Al</span>(1-x))(6)<span class="hlt">Al</span>(4) and ?(1). ?(7)-Zr(Cu(1-x)<span class="hlt">Al</span>(x))(12) (x = 0.514) has been confirmed to crystallize with the ThMn(12) type (space group I4/mmm; lattice parameters a = 0.85243(2) and c = 0.50862(3) nm). In total, 4 crystallographic sites were defined, out of which, Zr occupies site 2a, the 8f site is fully occupied by Cu, the 8i site is entirely occupied by <span class="hlt">Al</span>, but the 8j site turned out to comprise a random mixture of Cu and <span class="hlt">Al</span> atoms. The compound ?(9)-ZrCu(1-x)<span class="hlt">Al</span>(4) (x = 0.144) crystallizes in a unique structure type (space group P4/nmm; lattice parameters a = 0.40275(3) and c = 1.17688(4) nm) which exhibits full atom order but a vacancy (14.4%) on the 2c site, shared with Cu atoms. ?(9)-ZrCu(1-x)<span class="hlt">Al</span>(4) is a superstructure of Cu with an arrangement of three unit cells of Cu in the direction of the c-axis. A Bärnighausen tree documents this relationship. The ZrCu(1-x)<span class="hlt">Al</span>(4) type (n = 3) is part of a series of structures which follow this building principle: Cu (n = 1), Ti<span class="hlt">Al</span>(3) (n = 2), ?(5)-TiNi(2-x)<span class="hlt">Al</span>(5) (n = 4), HfGa(2) (n = 6) and Cu(3)Pd (n = 7). A partial isothermal section for the <span class="hlt">Al</span>-rich part of the Mo-Pd-<span class="hlt">Al</span> system at 860 °C has been established with two ternary compounds ?(1)-MoPd(2-x)<span class="hlt">Al</span>(8+x) and ?(2) (unknown structure). The Vickers hardness (H(v)) for ?(1) was found to be 842 ± 40 MPa. PMID:22183686</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/102246','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/102246"><span id="translatedtitle">Overview of the development of Fe<span class="hlt">Al</span> intermetallic alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Maziasz, P.J.; Liu, C.T.; Goodwin, G.M.</p> <p>1995-09-01</p> <p>B2-phase Fe<span class="hlt">Al</span> ordered intermetallic alloys based on an Fe-36 at.% <span class="hlt">Al</span> composition are being developed to optimize a combination of properties that includes high-temperature strength, room-temperature ductility, and weldability. Microalloying with boron and proper processing are very important for Fe<span class="hlt">Al</span> properties optimization. These alloys also have the good to outstanding resistance to oxidation, sulfidation, and corrosion in molten salts or chlorides at elevated temperatures, characteristic of Fe<span class="hlt">Al</span> with 30--40 at.% <span class="hlt">Al</span>. Ingot- and powder-metallurgy (IM and PM, respectively) processing both produce good properties, including strength above 400 MPa up to about 750 C. Technology development to produce Fe<span class="hlt">Al</span> components for industry testing is in progress. In parallel, weld-overlay cladding and powder coating technologies are also being developed to take immediate advantage of the high-temperature corrosion/oxidation and erosion/wear resistance of Fe<span class="hlt">Al</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1997NIMPB.123..279Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1997NIMPB.123..279Y"><span id="translatedtitle">26<span class="hlt">Al</span> uptake and accumulation in the rat brain</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yumoto, S.; Nagai, H.; Imamura, M.; Matsuzaki, H.; Hayashi, K.; Masuda, A.; Kumazawa, H.; Ohashi, H.; Kobayashi, K.</p> <p>1997-03-01</p> <p>To investigate the cause of Alzheimer's disease (senile dementia), 26<span class="hlt">Al</span> incorporation in the rat brain was studied by accelerator mass spectrometry (AMS). When 26<span class="hlt">Al</span> was injected into healthy rats, a considerable amount of 26<span class="hlt">Al</span> entered the brain (cerebrum) through the blood-brain barrier 5 days after a single injection, and the brain 26<span class="hlt">Al</span> level remained almost constant from 5 to 270 days. On the other hand, the level of 26<span class="hlt">Al</span> in the blood decreased remarkably 75 days after injection. Approximately 89% of the 26<span class="hlt">Al</span> taken in by the brain cell nuclei bound to chromatin. This study supports the theory that Alzheimer's disease is caused by irreversible accumulation of aluminium (<span class="hlt">Al</span>) in the brain, and brain cell nuclei.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007ApPhL..90y1902P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007ApPhL..90y1902P"><span id="translatedtitle">Structural stability in the <span class="hlt">Al</span>-Li-Si system</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Pisch, A.; Jakse, N.; Pasturel, A.; Harvey, J. P.; Chartrand, P.</p> <p>2007-06-01</p> <p>Density functional theory calculations are performed to theoretically interpret the structural stability of different ternary phases in the <span class="hlt">Al</span>-Li-Si system. The stability of the already well-known <span class="hlt">Al</span>LiSi compound is determined and found to be in excellent agreement with calorimetric measurements. The authors also study the stability of different phases reported in the literature. It is found that the ternary <span class="hlt">Al</span>3Li7Si4, <span class="hlt">Al</span>Li5Si2, and <span class="hlt">Al</span>Li9Si3 compounds display much higher negative formation energies than that of the <span class="hlt">Al</span>3Li8Si5 compound, giving new insights in understanding phase stabilities of compounds in the ternary <span class="hlt">Al</span>-Li-Si system.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19890066126&hterms=Daniel&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3DDaniel%2BK','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19890066126&hterms=Daniel&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3DDaniel%2BK"><span id="translatedtitle">1200 to 1400 K slow strain rate compressive behavior of small grain size Ni<span class="hlt">Al</span>/Ni2<span class="hlt">Al</span>Ti alloys and Ni<span class="hlt">Al</span>/Ni2<span class="hlt">Al</span>Ti-TiB2 composites</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Whittenberger, J. Daniel; Viswanadham, R. K.; Mannan, S. K.; Kumar, K. S.</p> <p>1989-01-01</p> <p>In order to impart ductility into Ni<span class="hlt">Al</span>-Ni2<span class="hlt">Al</span>Ti alloys, small grain size single (Ni-45<span class="hlt">Al</span>-5Ti) and two (Ni-40<span class="hlt">Al</span>-10Ti) phase intermetallics are fabricated by a process which yields fine microstructures in Ni<span class="hlt">Al</span>. The results of a study of elevated temperature compressive properties of two small grain size Ni<span class="hlt">Al</span>-Ni2<span class="hlt">Al</span>Ti alloys are then described. In addition, the behavior of the Ti-modified nickel aluminides with 20 vol pct TiB2 particles of approximately 1 micron in diameter is also investigated, since these compositions have the potential for being the matrix material in high temperature particulate-strengthened composites.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/935060','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/935060"><span id="translatedtitle">The Role of PentaCoordinated <span class="hlt">Al</span>3+ Ions in the High Temperature Phase Transformation of ?-<span class="hlt">Al</span>2O3</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kwak, Ja Hun; Hu, Jian Zhi; Lukaski, Adrienne C.; Kim, Do Heui; Szanyi, Janos; Peden, Charles HF</p> <p>2008-06-26</p> <p>In this work, the structural stability of gamma-alumina (?-<span class="hlt">Al</span>2O3) was investigated by a combination of XRD and high resolution solid state 27<span class="hlt">Al</span> MAS NMR at an ultra-high magnetic field of 21.1 tesla. XRD measurements show that ?-<span class="hlt">Al</span>2O3 undergoes a phase transition to ?-<span class="hlt">Al</span>2O3 during calcination at 1000oC for 10hr. The formation of the ?-<span class="hlt">Al</span>2O3 phase is further confirmed by 27<span class="hlt">Al</span> MAS NMR; additional 27<span class="hlt">Al</span> peaks centered at 10.5 and ~78 ppm were observed in samples calcined at this high temperature. Both the XRD and NMR results indicate that, after calcination at 1000°C for 10 hrs, the ratio of the ?-<span class="hlt">Al</span>2O3 phase to the total alumina in samples modified by either BaO or La2O3 is significantly reduced in comparison with ?-<span class="hlt">Al</span>2O3. 27<span class="hlt">Al</span> MAS NMR spectra revealed that the reduction in the extent of ?-<span class="hlt">Al</span>2O3 formation was highly correlated with the reduction in the amount of penta-coordinated aluminum ions, measured after 500°C calcination, in both BaO- and La2O3-modified ?-<span class="hlt">Al</span>2O3 samples. These results strongly suggest that the penta-coordinated aluminum ions, present exclusively on the surface of ?-<span class="hlt">Al</span>2O3, play a critical role in the phase transformation of ?-<span class="hlt">Al</span>2O3 to ?-<span class="hlt">Al</span>2O3. The role of the modifiers, in our case BaO or La2O3, is to convert the penta-coordinated aluminum ions into octahedral ones, thereby improving the thermal stabilities of the samples. Oxide additives, on the other hand, had no beneficial effect on preventing the specific surface area reduction that occurred during high temperature (?1000°C) calcination.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2012-08-09/pdf/2012-19563.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2012-08-09/pdf/2012-19563.pdf"><span id="translatedtitle">77 FR 47691 - In the Matter of the Designation of Azzam Abdullah Zureik <span class="hlt">Al</span>-Maulid <span class="hlt">Al</span>-Subhi, Also Known as Azzam...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2012-08-09</p> <p>..., Also Known as Mansur <span class="hlt">al</span>- Harbi, Also Known as Azam Abdullah Razeeq <span class="hlt">Al</span> Mouled Alsbhua, Also Known as Abu... <span class="hlt">Al</span>-Maulid <span class="hlt">Al</span>-Subhi, also known as Azzam <span class="hlt">al</span>-Subhi, also known as Mansur <span class="hlt">al</span>-Harbi, also known as...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25740686','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25740686"><span id="translatedtitle">Tropical soils cultivated with tomato: fractionation and speciation of <span class="hlt">Al</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Nogueirol, Roberta Corrêa; Monteiro, Francisco Antonio; Azevedo, Ricardo Antunes</p> <p>2015-04-01</p> <p>Soil acidity and the associated problems of aluminum (<span class="hlt">Al</span>) toxicity and scarce exchangeable bases are typically the most important limiting factors of agricultural yield in wet tropical regions. The goals of this study were to test how soil lime rates affect the forms and distribution of <span class="hlt">Al</span> in the soil fractions and how different levels of bioavailable <span class="hlt">Al</span> affect two tomato genotypes grown in wet tropical soils. The tomato genotypes CNPH 0082 and Calabash Rouge were grown in two wet tropical soils in a greenhouse. Soil lime rates of 0, 560, and 2240 mg kg(-1) soil (clay soil) and 0, 280, and 1120 mg kg(-1) soil (sandy soil) were applied to modify <span class="hlt">Al</span> concentrations. Dry mass production and <span class="hlt">Al</span> concentrations were determined in shoots and roots. <span class="hlt">Al</span> was fractionated in the soil, and the soil solution was speciated after cultivation. The Calabash Rouge genotype possesses mechanisms to tolerate <span class="hlt">Al</span>3+, absorbed less <span class="hlt">Al</span>, exhibited smaller reduction in growth, and lower <span class="hlt">Al</span> concentrations in plant parts than the CNPH 0082. Increased soil pH reduced the exchangeable <span class="hlt">Al</span> fraction and increased the fraction mainly linked to organic matter. <span class="hlt">Al</span> in the soil in the form of complexes with organic compounds and <span class="hlt">Al</span>(SO4)+ (at the highest lime rate) did not affect plant development. Soil acidity can be easily neutralized by liming the soil, which transforms toxic <span class="hlt">Al</span>3+ in the soil into forms that do not harm tomato plants, thereby avoiding oxidative stress in the plants. <span class="hlt">Al</span>-induced stress in tomatoes varies with genotypes and soil type. PMID:25740686</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009JAP...105a3707T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009JAP...105a3707T"><span id="translatedtitle">Comparison of the transport properties of high quality <span class="hlt">AlGaN/Al</span>N/GaN and <span class="hlt">AlInN/Al</span>N/GaN two-dimensional electron gas heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tülek, Remziye; Ilgaz, Aykut; Gökden, Sibel; Teke, Ali; Öztürk, Mustafa K.; Kasap, Mehmet; Özçelik, Süleyman; Arslan, Engin; Özbay, Ekmel</p> <p>2009-01-01</p> <p>The transport properties of high mobility <span class="hlt">AlGaN/Al</span>N/GaN and high sheet electron density <span class="hlt">AlInN/Al</span>N/GaN two-dimensional electron gas (2DEG) heterostructures were studied. The samples were grown by metal-organic chemical vapor deposition on c-plane sapphire substrates. The room temperature electron mobility was measured as 1700 cm2/V s along with 8.44×1012 cm-2 electron density, which resulted in a two-dimensional sheet resistance of 435 ?/? for the <span class="hlt">Al</span>0.2Ga0.8N/<span class="hlt">Al</span>N/GaN heterostructure. The sample designed with an <span class="hlt">Al</span>0.88In0.12N barrier exhibited very high sheet electron density of 4.23×1013 cm-2 with a corresponding electron mobility of 812 cm2/V s at room temperature. A record two-dimensional sheet resistance of 182 ?/? was obtained in the respective sample. In order to understand the observed transport properties, various scattering mechanisms such as acoustic and optical phonons, interface roughness, and alloy disordering were included in the theoretical model that was applied to the temperature dependent mobility data. It was found that the interface roughness scattering in turn reduces the room temperature mobility of the <span class="hlt">Al</span>0.88In0.12N/<span class="hlt">Al</span>N/GaN heterostructure. The observed high 2DEG density was attributed to the larger polarization fields that exist in the sample with an <span class="hlt">Al</span>0.88In0.12N barrier layer. From these analyses, it can be argued that the <span class="hlt">AlInN/Al</span>N/GaN high electron mobility transistors (HEMTs), after further optimization of the growth and design parameters, could show better transistor performance compared to <span class="hlt">AlGaN/Al</span>N/GaN based HEMTs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009A%26A...496..713W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009A%26A...496..713W"><span id="translatedtitle">Spectral and intensity variations of Galactic 26<span class="hlt">Al</span> emission</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, W.; Lang, M. G.; Diehl, R.; Halloin, H.; Jean, P.; Knödlseder, J.; Kretschmer, K.; Martin, P.; Roques, J. P.; Strong, A. W.; Winkler, C.; Zhang, X. L.</p> <p>2009-03-01</p> <p>Aims: Gamma-ray line emission from the radioactive decay of 26<span class="hlt">Al</span> reflects nucleosynthesis in massive stars and supernovae. We use INTEGRAL 26<span class="hlt">Al</span> measurements to characterize the distribution and characteristics of 26<span class="hlt">Al</span> source regions throughout the Galaxy. Methods: The spectrometer SPI aboard INTEGRAL has accumulated over five years of data on 26<span class="hlt">Al</span> gamma-ray emission from the Galactic plane. We analyzed these data using suitable instrumental-background models and adopted sky distribution models to produce high-resolution 26<span class="hlt">Al</span> spectra of Galactic emission, spatially resolved along the Galaxy plane. Results: We detect the 26<span class="hlt">Al</span> line from the inner Galaxy at 28? significance. The line appears narrow, and we constrain broadening in the source regions to <1.3 keV (2?). Different sky distribution models do not significantly affect those large-scale results. The 26<span class="hlt">Al</span> intensity for the inner Galaxy is derived as (2.9± 0.2) × 10-4 ph cm-2 s^{-1 rad-1}, consistent with earlier results from COMPTEL and SPI data. This can be translated to an 26<span class="hlt">Al</span> mass of 2.7 ± 0.7 M_? in the Galaxy as a whole. The 26<span class="hlt">Al</span> intensity is also confirmed to be somewhat brighter in the 4th than in the 1st quadrant (ratio 1.3 ± 0.2). 26<span class="hlt">Al</span> spectra separately derived for regions along the Galactic plane show clear line centroid shifts, attributed largely to the Galaxy's large-scale rotation. The 26<span class="hlt">Al</span> line toward the direction of the Aquila region (20° < l < 40°) appears somewhat broadened. Latitudinal variations of 26<span class="hlt">Al</span> emission towards the inner Galaxy are studied, finding a latitudinal scale height of 130+120-70 pc (1?) for 26<span class="hlt">Al</span> in the inner Galaxy and a hint (3?) of peculiar 26<span class="hlt">Al</span> emission towards the region l<0°, b>5°</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/7019378','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/7019378"><span id="translatedtitle">Passive film structure of supersaturated <span class="hlt">Al</span>-Mo alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Davis, G.D. ); Moshier, W.C. ); Long, G.G.; Black, D.R. )</p> <p>1991-11-01</p> <p>This paper reports that reflection-extended x-ray absorption fine-structure spectroscopy has been used to probe the local atomic structure of the passive film of supersaturated <span class="hlt">Al</span>-Mo alloys polarized in KCl. These alloys (with 7-11 atom percent Mo) exhibit resistance to localized attack with an increase in the pitting potential of {approximately} 600 mV relative to pure aluminum. Measurements show that the structure of the <span class="hlt">Al</span>-Mo passive films resembles that of {alpha}-<span class="hlt">Al</span>{sub 2}O{sub 3}/<span class="hlt">Al</span>OOH, whereas an oxide film grown on pure <span class="hlt">Al</span> in tartaric acid, which does not possess enhanced passivity, is more like {gamma}-<span class="hlt">Al</span>{sub 2}O{sub 3}/<span class="hlt">Al</span>OOH. Complementary x-ray photoelectron spectroscopy measurements indicate the <span class="hlt">Al</span>-Mo passive film composition to be near that of <span class="hlt">Al</span>OOH and the tartaric-acid film to be <span class="hlt">Al</span>{sub 2}O{sub 3}. Because corundum ({Alpha}-<span class="hlt">Al</span>{sub 2}O{sub 3}) and diaspore ({Alpha}-<span class="hlt">Al</span>OOH), which contain only octahedrally coordinated <span class="hlt">Al</span> atoms, are very stable and inert while {gamma}-<span class="hlt">Al</span>{sub 2}O{sub 3}, which contains both octahedral and tetrahedral sites, is reactive, the change in structure of the passive film suggest that improved passivity may be correlated with a reduction in the density of tetrahedrally coordinated atoms. This structural change likely results from the incorporation of oxidized Mo into the passive film; only as this Mo is hydrated with a presumed change in local structure does the alloy pit.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/21446423','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/21446423"><span id="translatedtitle">Formation of (H+, <span class="hlt">Al</span>+, <span class="hlt">Al</span>2+) co-doped bayerite and gamma-<span class="hlt">Al</span>2O3 plates from spinel-type related nanocondensates in water.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Liu, I-Lung; Chen, Shuei-Yuan; Shen, Pouyan</p> <p>2011-01-01</p> <p>The <span class="hlt">Al</span>2O3 nanocondensates of spinel-type related structures, i.e., gamma- and theta-type with a significant internal compressive stress via pulsed laser ablation in water were subjected to prolonged dwelling in water to form columnar bayerite plates for further transformation as platy gamma-<span class="hlt">Al</span>2O3. Transmission electron microscopic observations indicated the gamma-<span class="hlt">Al</span>2O3 follows the crystallographic relationship (100)b//(011)gamma; [001]b//[111]gamma with relic bayerite (denoted as b). The gamma-<span class="hlt">Al</span>2O3 also shows {111} twin/faults and rock salt-type domains due to dehydroxylation of bayerite which involves {1111} shuffling and disordering of the <span class="hlt">Al</span> ions in the octahedral and tetrahedral sites. The combined evidences of X-ray photoelectron spectroscopy, vibrational spectroscopy and UV-visible absorbance indicated that the H+, <span class="hlt">Al</span>+ and <span class="hlt">Al</span>2+ co-doped bayerite and gamma-<span class="hlt">Al</span>2O3 composite plates have a minimum band gap as low as approximately 5 eV for potential catalytic and electro-optical applications in water environment. PMID:21446423</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2012-12-11/pdf/2012-29870.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2012-12-11/pdf/2012-29870.pdf"><span id="translatedtitle">77 FR 73732 - In the Matter of Amendment of the Designation of <span class="hlt">al</span>-Qa'ida in Iraq, aka Jam'at <span class="hlt">al</span> Tawhid wa'<span class="hlt">al</span>...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2012-12-11</p> <p>...: November 20, 2012. Hillary Rodham Clinton, Secretary of State. BILLING CODE 4710-10-P ..., the Secretary of State concludes that there is a sufficient factual basis to find that <span class="hlt">al</span>-Qa'ida in... Secretary of State hereby amends the 2004 designation of <span class="hlt">al</span>-Qa'ida in Iraq as a foreign...</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_19 --> <div id="page_20" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="381"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20070032921','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20070032921"><span id="translatedtitle">Measured Activities of <span class="hlt">Al</span> and Ni in gamma-(Ni) and gamma'-(Ni)3<span class="hlt">Al</span> in the Ni-<span class="hlt">Al</span>-Pt System</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Copland, Evan</p> <p>2007-01-01</p> <p>Adding Pt to Ni-<span class="hlt">Al</span> coatings is critical to achieving the required oxidation protection of Ni-based superalloys, but the nature of the Pt effect remains unresolved. This research provides a fundamental part of the answer by measuring the influence of Pt on the activities of <span class="hlt">Al</span> and Ni in gamma-(Ni), gamma prime-(Ni)3<span class="hlt">Al</span> and liquid in the Ni-<span class="hlt">Al</span>-Pt system. Measurements have been made at 25 compositions in the Ni-rich corner over the temperature range, T = 1400-1750 K, by the vapor pressure technique with a multiple effusion-cell mass spectrometer (multi-cell KEMS). These measurements clearly show adding Pt (for X(sub Pt) less than 0.25) decreases a(<span class="hlt">Al</span>) while increasing a(Ni). This solution behavior supports the idea that Pt increases <span class="hlt">Al</span> transport to an alloy / <span class="hlt">Al</span>2O3 interface and also limits the interaction between the coating and substrate alloys in the gamma-(Ni) + gamma prime-(Ni)3<span class="hlt">Al</span> region. This presentation will review the progress of this study.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006ZNatA..61..389K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006ZNatA..61..389K"><span id="translatedtitle">Surface Tension of the System NaF -<span class="hlt">Al</span>F3-<span class="hlt">Al</span>2O3 and Surface Adsorption of <span class="hlt">Al</span>2O3</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kucharík, Marián; Vasiljev, Roman</p> <p>2006-08-01</p> <p>Part of the molten system NaF-<span class="hlt">Al</span>F3-<span class="hlt">Al</span>2O3 was studied by surface tension measurements, which were performed at cryolite ratios (CR) between 1.5 and 3 [CR = n(NaF)/n(<span class="hlt">Al</span>F3)]. The maximal bubble pressure method was applied. The surface adsorption of alumina (<span class="hlt">Al</span>2O3) was also calculated. The obtained results were discussed in terms of the anionic composition of the melt. The addition of <span class="hlt">Al</span>F3 to melt with CR= 3 decreases the surface tension, as <span class="hlt">Al</span>F3 is surface-active in molten Na3<span class="hlt">Al</span>F6. The concentration dependence of the surface tension and the surface adsorption of alumina in the title system are influenced by the formation of surface-active oxofluoroaluminates. An increase of the difference between the surface tension of NaF-<span class="hlt">Al</span>F3 mixtures and the surface tension of pure alumina was observed with decreasing cryolite ratio.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2004PSSAR.201.2356L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2004PSSAR.201.2356L"><span id="translatedtitle">Charge exchange in H+ grazing scattering off clean and <span class="hlt">Al</span>F3 covered <span class="hlt">Al</span>(111) surfaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lugo, J. O.; Goldberg, E. C.; Sánchez, E. A.; Grizzi, O.</p> <p>2004-08-01</p> <p>Ion Scattering Spectroscopy with Time-of-Flight analysis is used to characterize the deposition of thin insulating films (<span class="hlt">Al</span>F3) on <span class="hlt">Al</span>(111) samples, and to measure the ion fractions for 20 keV H+ projectiles scattered off clean and <span class="hlt">Al</span>F3 covered <span class="hlt">Al</span>(111) surfaces. The ion fraction measured for the clean surface is 12%, composed mainly of negative ions. For 2 ML of <span class="hlt">Al</span>F3, the ion fraction increases, be- ing in this case mainly composed of positive ions (+ = 33%, - = 3%). A calculation of the dynami- cal evolution of the collision and the resonant charge exchange processes describes the experimental trends.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26597298','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26597298"><span id="translatedtitle">Influence of Content of <span class="hlt">Al</span>2O3 on Structure and Properties of Nanocomposite Nb-B-<span class="hlt">Al</span>-O films.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Liu, Na; Dong, Lei; Dong, Lei; Yu, Jiangang; Pan, Yupeng; Wan, Rongxin; Gu, Hanqing; Li, Dejun</p> <p>2015-12-01</p> <p>Nb-B-<span class="hlt">Al</span>-O nanocomposite films with different power of <span class="hlt">Al</span>2O3 were successfully deposited on the Si substrate via multi-target magnetron co-sputtering method. The influences of <span class="hlt">Al</span>2O3's content on structure and properties of obtained nanocomposite films through controlling <span class="hlt">Al</span>2O3's power were investigated. Increasing the power of <span class="hlt">Al</span>2O3 can influence the bombarding energy and cause the momentum transfer of NbB2. This can lead to the decreasing content of <span class="hlt">Al</span>2O3. Furthermore, the whole films showed monocrystalline NbB2's (100) phase, and <span class="hlt">Al</span>2O3 shaded from amorphous to weak cubic-crystalline when decreasing content of <span class="hlt">Al</span>2O3. This structure and content changes were proof by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). When NbB2 grains were far from each other in lower power of <span class="hlt">Al</span>2O3, the whole films showed a typical nanocomposite microstructure with crystalline NbB2 grains embedded in a matrix of an amorphous <span class="hlt">Al</span>2O3 phase. Continuing increasing the power of <span class="hlt">Al</span>2O3, the less content of <span class="hlt">Al</span>2O3 tended to cause crystalline of cubic-<span class="hlt">Al</span>2O3 between the close distances of different crystalline NbB2 grains. The appearance of cubic-crystallization <span class="hlt">Al</span>2O3 can help to raise the nanocomposite films' mechanical properties to some extent. The maximum hardness and elastic modulus were up to 21.60 and 332.78 GPa, which were higher than the NbB2 and amorphous <span class="hlt">Al</span>2O3 monolithic films. Furthermore, this structure change made the chemistry bond of O atom change from the existence of O-Nb, O-B, and O-<span class="hlt">Al</span> bonds to single O-<span class="hlt">Al</span> bond and increased the specific value of <span class="hlt">Al</span> and O. It also influenced the hardness in higher temperature, which made the hardness variation of different <span class="hlt">Al</span>2O3 content reduced. These results revealed that it can enhance the films' oxidation resistance properties and keep the mechanical properties at high temperature. The study highlighted the importance of controlling the <span class="hlt">Al</span>2O3's content to prepare well-defined films with high mechanical properties and thermal stability. PMID:26597298</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015NRL....10..451L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015NRL....10..451L"><span id="translatedtitle">Influence of Content of <span class="hlt">Al</span>2O3 on Structure and Properties of Nanocomposite Nb-B-<span class="hlt">Al</span>-O films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Na; Dong, Lei; Dong, Lei; Yu, Jiangang; Pan, Yupeng; Wan, Rongxin; Gu, Hanqing; Li, Dejun</p> <p>2015-11-01</p> <p>Nb-B-<span class="hlt">Al</span>-O nanocomposite films with different power of <span class="hlt">Al</span>2O3 were successfully deposited on the Si substrate via multi-target magnetron co-sputtering method. The influences of <span class="hlt">Al</span>2O3's content on structure and properties of obtained nanocomposite films through controlling <span class="hlt">Al</span>2O3's power were investigated. Increasing the power of <span class="hlt">Al</span>2O3 can influence the bombarding energy and cause the momentum transfer of NbB2. This can lead to the decreasing content of <span class="hlt">Al</span>2O3. Furthermore, the whole films showed monocrystalline NbB2's (100) phase, and <span class="hlt">Al</span>2O3 shaded from amorphous to weak cubic-crystalline when decreasing content of <span class="hlt">Al</span>2O3. This structure and content changes were proof by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). When NbB2 grains were far from each other in lower power of <span class="hlt">Al</span>2O3, the whole films showed a typical nanocomposite microstructure with crystalline NbB2 grains embedded in a matrix of an amorphous <span class="hlt">Al</span>2O3 phase. Continuing increasing the power of <span class="hlt">Al</span>2O3, the less content of <span class="hlt">Al</span>2O3 tended to cause crystalline of cubic-<span class="hlt">Al</span>2O3 between the close distances of different crystalline NbB2 grains. The appearance of cubic-crystallization <span class="hlt">Al</span>2O3 can help to raise the nanocomposite films' mechanical properties to some extent. The maximum hardness and elastic modulus were up to 21.60 and 332.78 GPa, which were higher than the NbB2 and amorphous <span class="hlt">Al</span>2O3 monolithic films. Furthermore, this structure change made the chemistry bond of O atom change from the existence of O-Nb, O-B, and O-<span class="hlt">Al</span> bonds to single O-<span class="hlt">Al</span> bond and increased the specific value of <span class="hlt">Al</span> and O. It also influenced the hardness in higher temperature, which made the hardness variation of different <span class="hlt">Al</span>2O3 content reduced. These results revealed that it can enhance the films' oxidation resistance properties and keep the mechanical properties at high temperature. The study highlighted the importance of controlling the <span class="hlt">Al</span>2O3's content to prepare well-defined films with high mechanical properties and thermal stability.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22402920','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22402920"><span id="translatedtitle">The atomic details of the interfacial interaction between the bottom electrode of <span class="hlt">Al/Al</span>O{sub x}/<span class="hlt">Al</span> Josephson junctions and HF-treated Si substrates</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zeng, L. J.; Nik, S.; Olsson, E.; Krantz, P.; Delsing, P.</p> <p>2015-04-28</p> <p>The interface between the <span class="hlt">Al</span> bottom contact layer and Si substrates in <span class="hlt">Al</span> based Josephson junctions is believed to have a significant effect on the noise observed in <span class="hlt">Al</span> based superconducting devices. We have studied the atomic structure of it by transmission electron microscopy. An amorphous layer with a thickness of ∼5 nm was found between the bottom <span class="hlt">Al</span> electrode and HF-treated Si substrate. It results from intermixing between <span class="hlt">Al</span>, Si, and O. We also studied the chemical bonding states among the different species using energy loss near edge structure. The observations are of importance for the understanding of the origin of decoherence mechanisms in qubits based on these junctions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JCrGr.405...64S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JCrGr.405...64S"><span id="translatedtitle">Growth of crystallized <span class="hlt">Al</span>Ox on <span class="hlt">Al</span>N/GaN heterostructures by in-situ RF-MBE</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sugiura, Yohei; Honda, Tohru; Higashiwaki, Masataka</p> <p>2014-11-01</p> <p>We report successful growth of a crystallized <span class="hlt">Al</span>Ox layer on top of <span class="hlt">Al</span>N/GaN heterostructures by using RF-plasma molecular-beam epitaxy for exploring a new-type oxide/nitride heterostructure system. The insertion of an <span class="hlt">Al</span>Ox buffer layer, which was formed by following three steps of (i) an <span class="hlt">Al</span> metal deposition at 150 °C, (ii) an oxidation of the <span class="hlt">Al</span> metal by oxygen plasma irradiation, and (iii) an annealing of the oxidized layer at 800 °C, facilitated the formation of a crystalline <span class="hlt">Al</span>Ox layer on top of the <span class="hlt">Al</span>N/GaN structures. Surface morphologies observed by atomic force microscope showed that the <span class="hlt">Al</span>Ox buffer layer was directly formed on the nitride structure and fully covered the <span class="hlt">Al</span>N layer. The <span class="hlt">Al</span>Ox top layer grown on the buffer layer had a flat and smooth surface. A cross-sectional transmission electron microscopy micrograph revealed that the <span class="hlt">Al</span>Ox thin film grown at 800 °C on the nitride structure was fully crystallized.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25339547','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25339547"><span id="translatedtitle">Effect of silicate on the formation and stability of Ni-<span class="hlt">Al</span> LDH at the ?-<span class="hlt">Al</span>2O3 surface.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Tan, Xiaoli; Fang, Ming; Ren, Xuemei; Mei, Huiyang; Shao, Dadong; Wang, Xiangke</p> <p>2014-11-18</p> <p>The formation of mixed metal precipitates has been identified as a significant mechanism for the immobilization and elimination of heavy metal ions. Silicate is present in natural systems ubiquitously, which may interfere with metal uptake on the mineral surface and thereby influences the solubility of the precipitate. Herein, kinetic sorption and dissolution experiments combined with extended X-ray absorption fine structure spectroscopy (EXAFS) were performed to elucidate the effect of silicate on the formation of Ni precipitates at the ?-<span class="hlt">Al</span>2O3 surfaces. The uptake of Ni on ?-<span class="hlt">Al</span>2O3 decreased with increasing amounts of silicate coated onto the ?-<span class="hlt">Al</span>2O3 surface. Results of EXAFS analyses suggested the formation of Ni-<span class="hlt">Al</span> layered double hydroxide (LDH) phases. The surface coating of silicate on ?-<span class="hlt">Al</span>2O3 reduced <span class="hlt">Al</span> release and finally resulted in a high Ni:<span class="hlt">Al</span> ratio due to a lower extent of <span class="hlt">Al</span> substitution into the precipitates. The presence of silicate prevented the growth of the precipitates and led to the formation of less stable Ni-<span class="hlt">Al</span> LDH. The influence of silicate on the precipitate formation provided the evidence for the growth relationship between the precipitate and mineral substrate in the real environment. Increased rates of proton-promoted dissolution of Ni surface precipitates were mainly attributed to higher Ni:<span class="hlt">Al</span> ratios in Ni-<span class="hlt">Al</span> LDH precipitates formed in the presence of silicate. PMID:25339547</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6611923','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6611923"><span id="translatedtitle">Microstructures and mechanical behavior of Ni<span class="hlt">Al</span>-Mo and Ni<span class="hlt">Al</span>-MoTi two-phase alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Subramanian, P.R.; Mendiratta, M.G. . Materials Research Division); Miracle, D.B. )</p> <p>1994-12-01</p> <p>The phase relationship in the Ni<span class="hlt">Al</span>-Mo system is characterized by a eutectic equilibrium between binary Ni<span class="hlt">Al</span> and the terminal (Mo) solid solution, thereby offering the potential for development of ductile-phase-toughened composites. A study was conducted to evaluate the effect of varying volume fraction of the (Mo) phase on the microstructure, bend strength, and ambient temperature fracture behavior of selected Ni<span class="hlt">Al</span>-Mo two-phase alloys. Above room temperature, the Ni<span class="hlt">Al</span>-Mo alloys showed an increase in bend strength compared to monolithic Ni<span class="hlt">Al</span>, with reasonable strength retention up to [approximately]800 C. A further enhancement in toughness was realized through hot working. Fractography studies showed evidence for substantial decohesion between the (Mo) phase and the Ni<span class="hlt">Al</span> matrix, thereby suggesting the presence of a weak interface. This weak interface between the (Mo) phase and the Ni<span class="hlt">Al</span> matrix, in conjunction with modulus mismatch stresses, causes the crack to deflect from the (Mo) reinforcement and propagate preferentially along the (Mo)/Ni<span class="hlt">Al</span> interface. These attributes limit the potential for significant ductile-phase toughening in the Ni<span class="hlt">Al</span>-Mo system. An addition of 0.2 at. pct Ti resulted in a marked improvement in the room-temperature fracture toughness of Ni<span class="hlt">Al</span>-Mo. Fractography observations show some evidence for (Mo)/Ni<span class="hlt">Al</span> interface strengthening with the Ti addition.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4282486','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4282486"><span id="translatedtitle">Molecular and phenotypic characterization of <span class="hlt">Als</span>1 and <span class="hlt">Als</span>2 mutations conferring tolerance to acetolactate synthase herbicides in soybean</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Walter, Kay L; Strachan, Stephen D; Ferry, Nancy M; Albert, Henrik H; Castle, Linda A; Sebastian, Scott A</p> <p>2014-01-01</p> <p>BACKGROUND Sulfonylurea (SU) herbicides are effective because they inhibit acetolactate synthase (<span class="hlt">ALS</span>), a key enzyme in branched-chain amino acid synthesis required for plant growth. A soybean line known as W4-4 was developed through rounds of seed mutagenesis and was demonstrated to have a high degree of <span class="hlt">ALS</span>-based resistance to both post-emergence and pre-emergence applications of a variety of SU herbicides. This report describes the molecular and phenotypic characterization of the <span class="hlt">Als</span>1 and <span class="hlt">Als</span>2 mutations that confer herbicide resistance to SUs and other <span class="hlt">ALS</span> inhibitors. RESULTS The mutations are shown to occur in two different <span class="hlt">ALS</span> genes that reside on different chromosomes: <span class="hlt">Als</span>1 (P178S) on chromosome 4 and <span class="hlt">Als</span>2 (W560L) on chromosome 6 (P197S and W574L in Arabidopsis thaliana). CONCLUSION Although the <span class="hlt">Als</span>1 and <span class="hlt">Als</span>2 genes are unlinked, the combination of these two mutations is synergistic for improved tolerance of soybeans to <span class="hlt">ALS</span>-inhibiting herbicides. © 2014 DuPont Pioneer. Pest Management Science published by JohnWiley & Sons Ltd on behalf of Society of Chemical Industry. PMID:24425499</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JEMat.tmp..639B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JEMat.tmp..639B"><span id="translatedtitle"><span class="hlt">Al</span> Incorporation at All Growth Stages of <span class="hlt">Al</span> x Ga1-x N Epilayers Using SiN Treatment</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Benzarti, Z.; Halidou, I.; Touré, A.; El Jani, B.</p> <p>2015-12-01</p> <p><span class="hlt">Al</span> compositional distribution of <span class="hlt">Al</span> x Ga1-x N epilayers grown on SiN-treated sapphire substrate by atmospheric pressure metalorganic vapor phase epitaxy is investigated. The growth process was interrupted at various stages allowing a systematic study of <span class="hlt">Al</span> x Ga1-x N epilayers during the smoothing process. A transition from three-dimensional (3D) to two-dimensional (2D) growth mode is revealed by in situ laser reflectometry (? = 632.8 nm) as well as by atomic force microscopic images. Then, ion mass spectrometry analysis was performed to obtain the solid <span class="hlt">Al</span> composition (x) profile as well as by photoluminescence measurements. Moreover, the in situ reflectivity signal is simulated; thereby <span class="hlt">Al</span> x Ga1-x N growth rate is derived and compared with that of GaN layer in order to study the effect of the aluminum incorporation on the growth mechanism. It is worth emphasising that the growth mode of <span class="hlt">Al</span> x Ga1-x N layers is dictated by SiN treatment, which influences the <span class="hlt">Al</span> compositional distribution. Electron mobility and refractive index against the thickness of <span class="hlt">Al</span> x Ga1-x N layers have similar trends, which confirm a competitive mechanism between growth mode and <span class="hlt">Al</span> incorporation. Therefore, the correlation between the <span class="hlt">Al</span> composition and morphological, optical, and electrical properties of <span class="hlt">Al</span> x Ga1-x N layers is established.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JEMat..45..872B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JEMat..45..872B"><span id="translatedtitle"><span class="hlt">Al</span> Incorporation at All Growth Stages of <span class="hlt">Al</span> x Ga1- x N Epilayers Using SiN Treatment</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Benzarti, Z.; Halidou, I.; Touré, A.; El Jani, B.</p> <p>2016-02-01</p> <p><span class="hlt">Al</span> compositional distribution of <span class="hlt">Al</span> x Ga1- x N epilayers grown on SiN-treated sapphire substrate by atmospheric pressure metalorganic vapor phase epitaxy is investigated. The growth process was interrupted at various stages allowing a systematic study of <span class="hlt">Al</span> x Ga1- x N epilayers during the smoothing process. A transition from three-dimensional (3D) to two-dimensional (2D) growth mode is revealed by in situ laser reflectometry (λ = 632.8 nm) as well as by atomic force microscopic images. Then, ion mass spectrometry analysis was performed to obtain the solid <span class="hlt">Al</span> composition ( x) profile as well as by photoluminescence measurements. Moreover, the in situ reflectivity signal is simulated; thereby <span class="hlt">Al</span> x Ga1- x N growth rate is derived and compared with that of GaN layer in order to study the effect of the aluminum incorporation on the growth mechanism. It is worth emphasising that the growth mode of <span class="hlt">Al</span> x Ga1- x N layers is dictated by SiN treatment, which influences the <span class="hlt">Al</span> compositional distribution. Electron mobility and refractive index against the thickness of <span class="hlt">Al</span> x Ga1- x N layers have similar trends, which confirm a competitive mechanism between growth mode and <span class="hlt">Al</span> incorporation. Therefore, the correlation between the <span class="hlt">Al</span> composition and morphological, optical, and electrical properties of <span class="hlt">Al</span> x Ga1- x N layers is established.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25322003','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25322003"><span id="translatedtitle">Enhanced spectral response of an <span class="hlt">Al</span>GaN-based solar-blind ultraviolet photodetector with <span class="hlt">Al</span> nanoparticles.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bao, Guanghong; Li, Dabing; Sun, Xiaojuan; Jiang, Mingming; Li, Zhiming; Song, Hang; Jiang, Hong; Chen, Yiren; Miao, Guoqing; Zhang, Zhiwei</p> <p>2014-10-01</p> <p>An enhanced spectral response was realized in an <span class="hlt">Al</span>GaN-based solar-blind ultraviolet (SB-UV) detector using aluminum (<span class="hlt">Al</span>) nanoparticles (NPs) of 20-60 nm. The peak responsivity of the detector (about 288 nm) with 60 nm <span class="hlt">Al</span> NPs is more than two times greater than that of a detector without <span class="hlt">Al</span> NPs under a 5-V bias, reaching 0.288 A/W. To confirm the enhancement mechanism of the <span class="hlt">Al</span> NPs, extinction spectra were simulated using time-domain and frequency-domain finite-element methods. The calculation results show that the dipole surface plasmon resonance wavelength of the <span class="hlt">Al</span> NPs is localized near the peak responsivity position of <span class="hlt">Al</span>GaN-based SB-UV detectors. Thus, the improvement in the detectors can be ascribed to the localized surface plasmon resonance effect of the <span class="hlt">Al</span> NPs. The localized electric field enhancement and related scattering effect result in the generation of more electron-hole pairs and thus a higher responsivity. In addition, the dark current of <span class="hlt">Al</span>GaN-based SB-UV detectors does not increase after the deposition of <span class="hlt">Al</span> nanoparticles. The results presented here is promising for applications of <span class="hlt">Al</span>GaN-based SB-UV detectors. PMID:25322003</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014MMTB...45.2057R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014MMTB...45.2057R"><span id="translatedtitle">Formation and Thermodynamics of Mg-<span class="hlt">Al</span>-Ti-O Complex Inclusions in Mg-<span class="hlt">Al</span>-Ti-Deoxidized Steel</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ren, Ying; Zhang, Lifeng; Yang, Wen; Duan, Haojian</p> <p>2014-12-01</p> <p>The formation of Mg-<span class="hlt">Al</span>-Ti-O complex inclusions in steel was investigated by laboratory experiments and thermodynamic calculation. The composition evolutions of Mg-<span class="hlt">Al</span>-Ti-O inclusions in steel with different contents of [<span class="hlt">Al</span>], [Mg], and [Ti] were discussed. Mg-<span class="hlt">Al</span>-Ti-O complex inclusion with high TiOx content was liquid at 1873 K (1600 °C), indicating Mg<span class="hlt">Al</span>2O4 spinel inclusions can be modified to low melting temperature ones by combining TiOx component. The stability diagram of <span class="hlt">Al</span>-Mg-Ti-O system inclusions in the molten steel at 1873 K (1600 °C) was calculated, considering many kinds of oxide inclusions such as MgO, <span class="hlt">Al</span>2O3, TiOx, MgTi2O4, Mg<span class="hlt">Al</span>2O4, <span class="hlt">Al</span>2TiO5, and liquid inclusion. The thermodynamic calculations are in good agreement with experimental results, which can predict the formation of <span class="hlt">Al</span>-Mg-Ti-O complex inclusions in molten steel with a large concentration range of [<span class="hlt">Al</span>], [Mg], and [Ti].</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JPhCS.683a2016T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JPhCS.683a2016T"><span id="translatedtitle">Single crystal 27<span class="hlt">Al</span>-NMR study of the cubic ?3 ground doublet system PrTi2<span class="hlt">Al</span>20</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Taniguchi, T.; Yoshida, M.; Takeda, H.; Takigawa, M.; Tsujimoto, M.; Sakai, A.; Matsumoto, Y.; Nakatsuji, S.</p> <p>2016-02-01</p> <p>We report results of 27<span class="hlt">Al</span>-NMR measurements on a single crystal of PrTi2<span class="hlt">Al</span>20, in which the ground state of Pr3+ ions in the crystalline electric field is the nonmagneitc ?3 doublet. From the analysis of NMR spectra with the magnetic field applied precisely along the ?111? and ?100? directions, we determined the electric field gradient tensors for all three inequivalent <span class="hlt">Al</span> sites (<span class="hlt">Al</span>(1) ? <span class="hlt">Al</span>(3) sites) and the anisotropic Knight shifts for the <span class="hlt">Al</span>(3) sites. The hyperfine coupling tensor at the <span class="hlt">Al</span>(3) sites is strongly anisotropic and much larger than the classical dipolar coupling, indicating importance of the anisotropic hybridization between the conduction and ƒ electron states.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2001JAP....89.6874S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2001JAP....89.6874S"><span id="translatedtitle">High-resolution electron microscopy study of tunnelling junctions with <span class="hlt">Al</span>N and <span class="hlt">Al</span>ON barriers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shang, Ping; Petford-Long, Amanda K.; Nickel, Janice H.; Sharma, Manish; Anthony, Thomas C.</p> <p>2001-06-01</p> <p>Spin-dependent tunnel junctions with <span class="hlt">Al</span>ON and <span class="hlt">Al</span>N barriers have been investigated using high-resolution electron microscopy. Plasma gas composition, nitridation time, and deposited <span class="hlt">Al</span> thickness were studied independently. Plasma-nitrided <span class="hlt">Al</span> produces thinner tunnel barriers than those obtained with an oxygen or oxygen+nitrogen plasma, for the same plasma exposure time. Experiments to study an increase in plasma nitridation time for a constant <span class="hlt">Al</span> deposition thickness showed that overexposure to the plasma resulted in a thinner barrier—possibly due to the competing processes of nitride formation and slight etching of the barrier. The <span class="hlt">Al</span>N barrier thickness increases monotonically with deposited <span class="hlt">Al</span> thickness for a constant nitridation time. Electron energy loss spectroscopy compositional mapping has confirmed that nitrogen is present in the barrier layer. The roughness between the barrier layer and the two ferromagnetic layers has also been estimated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22303852','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22303852"><span id="translatedtitle">High quality semipolar (11{sup ¯}02) <span class="hlt">AlGaN/Al</span>N quantum wells with remarkably enhanced optical transition probabilities</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Ichikawa, S. Iwata, Y.; Funato, M.; Kawakami, Y.; Nagata, S.</p> <p>2014-06-23</p> <p>Adjusting the growth conditions from those for c-plane growth realizes high-quality semipolar (11{sup ¯}02) <span class="hlt">AlGaN/Al</span>N quantum wells (QWs) with atomically smooth surfaces and abrupt interfaces on <span class="hlt">Al</span>N substrates. Upon comparing the optical properties to those of c-plane QWs using time-integrated and time-resolved photoluminescence spectroscopy, the estimated internal electric field is much smaller in (11{sup ¯}02) <span class="hlt">AlGaN/Al</span>N QWs than in c-plane QWs. Thus, (11{sup ¯}02) <span class="hlt">AlGaN/Al</span>N QWs have narrower emission line widths and remarkably faster radiative recombination lifetimes, realizing highly efficient deep ultraviolet emissions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1995JAP....77.5718G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1995JAP....77.5718G"><span id="translatedtitle">Formation of thin <span class="hlt">Al</span>N films on Ni<span class="hlt">Al</span>(001) upon thermal decomposition of ammonia</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gassmann, P.; Bartolucci, F.; Franchy, R.</p> <p>1995-06-01</p> <p>The formation of thin <span class="hlt">Al</span>N films on Ni<span class="hlt">Al</span>(001) has been studied by means of high resolution electron energy loss spectroscopy (HREELS), low-energy electron diffraction (LEED), and Auger electron spectroscopy. The <span class="hlt">Al</span>N films were grown by the adsorption of NH3 on Ni<span class="hlt">Al</span>(001) at T=80 K and subsequent thermal decomposition at elevated temperatures. After annealing to T=1250 K, a distinct LEED pattern appears which exhibits pseudo-twelvefold symmetry. This indicates the formation of two hexagonal domains of <span class="hlt">Al</span>N which are rotated by 90° with respect to each other. HREEL spectra of the ordered <span class="hlt">Al</span>N film show a Fuchs-Kliewer phonon mode at 865 cm-1 in good agreement with theoretical spectra calculated on the base of the dielectric theory. The electronic energy gap of the thin <span class="hlt">Al</span>N films is determined to be Eg?6.1 eV.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/665229','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/665229"><span id="translatedtitle">Positron lifetime studies of decomposition in 2024 (<span class="hlt">Al</span>-Cu-Mg) and 7010 (<span class="hlt">Al</span>-Zn-Cu-Mg) alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Dlubek, G.; Lademann, P.; Krause, H.; Krause, S.; Unger, R.</p> <p>1998-09-04</p> <p>In the current paper, the decomposition behavior of the engineering alloys 2024 (<span class="hlt">Al</span>-Cu-Mg) and 7010 (<span class="hlt">Al</span>-Zn-Cu-Mg) is studied using positron lifetime measurements. Positrons probe open volume defects such as vacancies and dislocations. However, they may also be used to investigate coherent zones and incoherent precipitates. In order to understand the rather complicated precipitation sequences and the response of positrons to different type of precipitates occurring in 2024 and 7010 alloys, binary and ternary laboratory alloys were also investigated under the same experimental conditions as the engineering alloys. The interpretations of the results are based on experiences of the group from extensive positron studies of laboratory alloys such as <span class="hlt">Al</span>-Zn, <span class="hlt">Al</span>-Zn-Mg, <span class="hlt">Al</span>-Cu, and further <span class="hlt">Al</span> alloys (see also the review (4)). Their collected results are shown as lifetimes and curve-shape parameters S of the electron-positron momentum distribution curves characteristic for different precipitates in <span class="hlt">Al</span> alloys.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016SSCom.227....9B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016SSCom.227....9B"><span id="translatedtitle">Temperature effects on the radiative recombination in In<span class="hlt">AlAs/GaAl</span>As quantum dots</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ben Daly, A.; Bernardot, F.; Barisien, T.; Lemaître, A.; Maaref, M. A.; Testelin, C.</p> <p>2016-02-01</p> <p>The influence of the temperature has been studied in self-assembled In<span class="hlt">AlAs/GaAl</span>As quantum dots (QDs) using photoluminescence (PL) and time-resolved PL (TRPL). With increasing temperature, the exciton retrapping in QDs, after a thermal activation, is evidenced and confirmed by a narrowing of the PL spectrum width, and an increase of the PL decay time. From the temperature dependence of the integrate PL signal, the activation energy is estimated at 110 meV, in agreement with the electronic state in QD and wetting layer (WL) determinate by PL spectroscopy measurements. The influence of the QD size on the QD confinement energy, is also observed in the evolution of the decay time with temperature and detection energy.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_20 --> <div id="page_21" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="401"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JMEP...22.1582Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JMEP...22.1582Z"><span id="translatedtitle">Inverse Thermal Analysis of Heat-Affected Zone in <span class="hlt">Al</span>2129 and <span class="hlt">Al</span>2198 Laser Welds</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zervaki, A. D.; Haidemenopoulos, G. N.; Lambrakos, S. G.</p> <p>2013-06-01</p> <p>Case study analyses of A12139 and <span class="hlt">Al</span>2198 laser welds are presented. These analyses demonstrate the concept of constructing parameter spaces for prediction of properties within the heat-affected zone (HAZ) of welds using inverse modeling, which are in turn for process control. The construction of these parameter spaces consists of two procedures. One procedure entails calculation of a parameterized set of temperature histories by inverse analysis of the heat deposition occurring during welding. The other procedure entails correlating these temperature histories with a specific physical property of the weld that is measurable. The analyses presented here examines some characteristics of inverse modeling with respect to the prediction of hardness within the HAZ for deep penetration laser welding of the Aluminum alloys A12139 and <span class="hlt">Al</span>2198. This study further demonstrates the feasibility of constructing a parameter space for the prediction of weld properties using weld cross section measurements that are independent of weld process conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22402463','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22402463"><span id="translatedtitle">Tunneling spectroscopy of <span class="hlt">Al/Al</span>O{sub x}/Pb subjected to hydrostatic pressure</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zhu, Jun; Hou, Xing-Yuan; Guan, Tong; Zhang, Qin-Tong; Li, Yong-Qing; Han, Xiu-Feng; Li, Chun-Hong; Ren, Cong; Yang, Zheng-Xin; Zhang, Jin; Shan, Lei; Chen, Gen-Fu</p> <p>2015-05-18</p> <p>We develop an experimental tool to investigate high-pressure electronic density of state by combining electron tunneling spectroscopy measurements with high-pressure technique. It is demonstrated that tunneling spectroscopy measurement on <span class="hlt">Al/Al</span>O{sub x}/Pb junction is systematically subjected to hydrostatic pressure up to 2.2 GPa. Under such high pressure, the normal state junction resistance is sensitive to the applied pressure, reflecting the variation of band structure of the barrier material upon pressures. In superconducting state, the pressure dependence of the energy gap Δ{sub 0}, the gap ratio 2Δ{sub 0}/k{sub B}T{sub c}, and the phonon spectral energy is extracted and compared with those obtained in the limited pressure range. Our experimental results show the accessibility and validity of high pressure tunneling spectroscopy, offering wealthy information about high pressure superconductivity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007PhyC..451...19Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007PhyC..451...19Y"><span id="translatedtitle">Missing superconductivity in Ba<span class="hlt">Al</span>Si with the <span class="hlt">Al</span>B 2 type structure</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yamanaka, Shoji; Otsuki, Teruyoshi; Ide, Takayuki; Fukuoka, Hiroshi; Kumashiro, Ryotaro; Rachi, Takeshi; Tanigaki, Katsumi; Guo, FangZhun; Kobayashi, Keisuke</p> <p>2007-01-01</p> <p>The solid solutions Ba<span class="hlt">Al</span> 1- xSi 1+ x (0 ? x ? 0.5) were prepared. The compound with the stoichiometric composition ( x = 0) did not show superconductivity as reported by other investigators, but the solid solutions with x > 0 became superconductors with a transition temperature Tc = 2.8 K. The comparison of the lattice parameters with those of the other isotypic ternary superconductors MAlSi (M = Ca, Sr) suggested that the superconductivity could be related to the lattice parameter within the (<span class="hlt">Al</span>Si) plane rather than the interlayer spacing. The band structures near the Fermi level of MAlSi (M = Ca, Sr, Ba) were measured using soft X-ray photoelectron spectroscopy, which were in good agreement with the calculated ones, confirming that the contribution of the d orbitals of the alkaline-earth metals were predominant in the conduction bands.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/571824','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/571824"><span id="translatedtitle">Investigation of superplastic behavior of Ni<span class="hlt">Al</span> and Ni{sub 3}<span class="hlt">Al</span> duplex alloy</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Liu Zhenyun; Lin Dongliang; Gu Yuefeng; Shan Aidang</p> <p>1997-12-31</p> <p>The superplastic behavior of a Ni<span class="hlt">Al</span> and Ni{sub 3}<span class="hlt">Al</span> duplex alloy was investigated. It was found that the alloy exhibits superplastic behavior over a narrow temperature range, from 975 C to 1,025 C at the strain rate of 1.52 {times} 10{sup {minus}4}s{sup {minus}1}. A maximum tensile elongation of 149% was obtained at 1,000 C with the strain rate sensitivity up to 0.375. The superplastic deformation of the duplex alloy can be approximately described by an empirical equation of the form: {dot {var_epsilon}} = Ao{sup 2.67} exp({minus}303,000/RT). Optical microstructure and TEM observation show that the superplastic behavior mechanism of the investigated alloy is a process of continuous recovery and recrystallization during deformation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10115776','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10115776"><span id="translatedtitle">Kinetic energy distributions of sputtered neutral aluminum clusters: <span class="hlt">Al--Al</span>{sub 6}</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Coon, S.R.; Calaway, W.F.; Pellin, M.J.; Curlee, G.A.; White, J.M.</p> <p>1992-12-01</p> <p>Neutral aluminum clusters sputtered from polycrystalline aluminum were analyzed by laser postionization time-of-flight (TOF) mass spectrometry. The kinetic energy distributions of <span class="hlt">Al</span> through <span class="hlt">Al</span>{sub 6} were measured by a neutrals time-of-flight technique. The interpretation of laser postionization TOF data to extract velocity and energy distributions is presented. The aluminum cluster distributions are qualitatively similar to previous copper cluster distribution measurements from our laboratory. In contrast to the steep high energy tails predicted by the single- or multiple- collision models, the measured cluster distributions have high energy power law dependences in the range of E{sup {minus}3} to E{sup {minus}4.5}. Correlated collision models may explain the substantial abundance of energetic clusters that are observed in these experiments. Possible influences of cluster fragmentation on the distributions are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/6829007','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/6829007"><span id="translatedtitle">Kinetic energy distributions of sputtered neutral aluminum clusters: <span class="hlt">Al--Al</span>[sub 6</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Coon, S.R.; Calaway, W.F.; Pellin, M.J. ); Curlee, G.A. . Dept. of Physics); White, J.M. . Dept. of Chemistry and Biochemistry)</p> <p>1992-01-01</p> <p>Neutral aluminum clusters sputtered from polycrystalline aluminum were analyzed by laser postionization time-of-flight (TOF) mass spectrometry. The kinetic energy distributions of <span class="hlt">Al</span> through <span class="hlt">Al</span>[sub 6] were measured by a neutrals time-of-flight technique. The interpretation of laser postionization TOF data to extract velocity and energy distributions is presented. The aluminum cluster distributions are qualitatively similar to previous copper cluster distribution measurements from our laboratory. In contrast to the steep high energy tails predicted by the single- or multiple- collision models, the measured cluster distributions have high energy power law dependences in the range of E[sup [minus]3] to E[sup [minus]4.5]. Correlated collision models may explain the substantial abundance of energetic clusters that are observed in these experiments. Possible influences of cluster fragmentation on the distributions are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005JOM....57h..34B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005JOM....57h..34B"><span id="translatedtitle">Removing <span class="hlt">Al</span> and regenerating caustic soda from the spent washing liquor of <span class="hlt">Al</span> etching</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Barakat, M. A.; El-Sheikh, S. M.; Farghly, F. E.</p> <p>2005-08-01</p> <p>Spent liquor from washing of aluminum section materials after etching with caustic soda (NaOH) has been treated. Aluminum was removed from the liquor and caustic soda was regenerated by adding precipitating agents to hydrolyze sodium aluminate (Na2<span class="hlt">Al</span>O2), separating the aluminumprecipitate, and concentrating free NaOH in the resulting solution for reuse in the etching process. Four systems were investigated: hydrated lime [Ca(OH)2], hydrogen peroxide (H2O2), H2O2/Ca(OH)2 mixture, and dry lime (CaO). Results revealed that CaO was more efficient in the removal of aluminum from the spent liquor with a higher hydrolyzing rate of Na2<span class="hlt">Al</span>O2 than Ca(OH)2, H2O2, or their mixture.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/62971','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/62971"><span id="translatedtitle">Internal friction in <span class="hlt">AlCu-Al</span>{sub 2}O{sub 3} metal matrix composites</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Parrini, L.; Schaller, R.</p> <p>1994-12-31</p> <p>In MMC`s the metal matrix is exposed to plastic deformation and damage accumulation in the region close to the reinforcements, following mechanical or thermal stress. In this connection, <span class="hlt">Al</span>-4%Cu based MMC`s reinforced with 20% <span class="hlt">Al</span>{sub 2}O{sub 3} fibers were characterized by internal friction (IF) measurements. IF measurements as a function of the vibration amplitude present a solid friction peak connected with interfaces loosening, while plastic deformation was associated with a high amplitude IF background. On this basis, IF measurements allowed the authors to identify the distribution of internal stresses and damage accumulation at matrix-fiber interfaces or plastic flow in the matrix in different thermomechanical conditions. Furthermore, IF measurements allowed damage accumulation consequent to mechanical fatigue to be followed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1988JaJAP..27L1579I','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1988JaJAP..27L1579I"><span id="translatedtitle">Glass Transition Behavior of <span class="hlt">Al</span>-Y-Ni and <span class="hlt">Al</span>-Ce-Ni Amorphous Alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Inoue, Akihisa; Ohtera, Katsumasa; Tsai, An-Pang; Kimura, Hisamichi; Masumoto, Tsuyoshi</p> <p>1988-09-01</p> <p>Ductile <span class="hlt">Al</span>-Y-Ni and <span class="hlt">Al</span>-Ce-Ni amorphous alloys were found to exhibit a glass transition at temperatures just below crystallization temperature. The glass transition temperature increases from 490 to 582 K with increasing solute concentration. The difference in specific heat between amorphous solid (AS) and supercooled liquid (SL) reaches 9.2 J/mol-K and the temperature coefficient of expansion and viscosity of the supercooled liquid are 100× 10-5 K-1 and 3× 1013 poise. By the transition of AS to SL, the Young’s modulus and tensile strength also decrease steeply by about 63 and 66%, accompanied with an increase of elongation by about 320%.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26426433','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26426433"><span id="translatedtitle">Gate-Tunable Electron Transport Phenomena in <span class="hlt">Al</span>-Ge⟨111⟩-<span class="hlt">Al</span> Nanowire Heterostructures.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Brunbauer, Florian M; Bertagnolli, Emmerich; Lugstein, Alois</p> <p>2015-11-11</p> <p>Electrostatically tunable negative differential resistance (NDR) is demonstrated in monolithic metal-semiconductor-metal (<span class="hlt">Al-Ge-Al</span>) nanowire (NW) heterostructures integrated in back-gated field-effect transistors (FETs). Unambiguous signatures of NDR even at room temperature are attributed to intervalley electron transfer. At yet higher electric fields, impact ionization leads to an exponential increase of the current in the ⟨111⟩ oriented Ge NW segments. Modulation of the transfer rates, manifested as a large tunability of the peak-to-valley ratio (PVR) and the onset of impact ionization is achieved by the combined influences of electrostatic gating, geometric confinement, and heterojunction shape on hot electron transfer and by electron-electron scattering rates that can be altered by varying the charge carrier concentration in the NW FETs. PMID:26426433</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JMEP...22.1471I','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JMEP...22.1471I"><span id="translatedtitle">Improvement of the Electrochemical Behavior of Steel Surfaces Using a [Ti-<span class="hlt">Al/Ti-Al</span>-N] n Multilayer System</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ipaz, L.; Aperador, W.; Caicedo, J. C.; Esteve, J.; Zambrano, G.</p> <p>2013-05-01</p> <p>The aim of this work is to improve the corrosion resistance of AISI D3 steel surfaces using a [Ti-<span class="hlt">Al/Ti-Al</span>-N] n multilayer system deposited with different periods (?) and bilayer numbers ( n), via magnetron co-sputtering pulsed d.c. procedure, from a metallic (Ti-<span class="hlt">Al</span>) binary target. The multilayer coatings were characterized by cross-sectional scanning electron microscopy that showed the modulation and microstructure of the [Ti-<span class="hlt">Al/Ti-Al</span>-N] n multilayer system. The composition of the single Ti-<span class="hlt">Al</span> and Ti-<span class="hlt">Al</span>-N layer films was studied via x-ray photoelectron spectroscopy, where typical signals for Ti2p1/2, Ti2p, N1s, and <span class="hlt">Al</span>2p3/2 were detected. The electrochemical properties were evaluated by electrochemical impedance spectroscopy and Tafel polarization curves. The optimal electrochemical behavior was obtained for the [Ti-<span class="hlt">Al/Ti-Al</span>-N] n multilayered period of ? = 25 nm (100 bilayers). At these conditions, the maximum polarization resistance (1719.32 k? cm2) and corrosion rate (0.7 ?my) were 300 and 35 times higher than that of uncoated AISI D3 steel substrate (5.61 k? cm2 and 25 ?my, respectively). Finally, scanning electron microscopy was used to analyze the [Ti-<span class="hlt">Al/Ti-Al</span>-N] n multilayered surface after the corrosive attack. The improvement effects in the electrochemical behavior of the AISI D3 coated with the [Ti-<span class="hlt">Al/Ti-Al</span>-N] n multilayered coatings could be attributed to the number of interfaces that act as obstacles for the inward and outward diffusions of Cl- ions, generating an increment in the energy or potential required for translating the corrosive ions across the coating/substrate interface.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JOM....67g1505M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JOM....67g1505M"><span id="translatedtitle">In Situ <span class="hlt">Al</span> Based Composites Fabricated in <span class="hlt">Al</span>-SiO2-C System by Reaction Sintering</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mokhnache, El Oualid; Wang, Guisong; Geng, Lin; Kaveendran, Balasubramaniam; Henniche, Abdelkhalek; Ramdani, Noureddine</p> <p>2015-07-01</p> <p>In situ <span class="hlt">Al</span>-based composites with different SiO2/C/<span class="hlt">Al</span> molar ratios were fabricated by reaction hot pressing. Differential scanning calorimetry (DSC) was used to investigate the reaction mechanisms in the <span class="hlt">Al</span>-SiO2-C system. X-ray diffraction results revealed that no new resultant phase was observed below the melting temperature of aluminum except the SiO2, C and <span class="hlt">Al</span> phases. Heating at different synthesis temperatures showed that, up to 1000°C with a holding time of 1 h, the reactions in the <span class="hlt">Al</span>-SiO2-C system took place completely, where the final products were <span class="hlt">Al</span>2O3, SiC, <span class="hlt">Al</span>4C3 and Si. Microstructural observation showed that the in situ synthesized <span class="hlt">Al</span>2O3, SiC, <span class="hlt">Al</span>4C3, and Si were dispersed uniformly and had fine sizes less than 2 µm. The formed interfaces between the reinforcements and <span class="hlt">Al</span> matrix are clean and free from any interfacial phase. During cooling, the synthesized Si formed a multilayer growth in the (111) direction. When the SiO2/C/<span class="hlt">Al</span> molar ratio was (6/3/9), more <span class="hlt">Al</span>2O3 and Si were produced along with the complete prevention of <span class="hlt">Al</span>4C3 in the <span class="hlt">Al</span>-SiO2-C system. The yield strength, ultimate tensile strength and Brinell hardness of the in situ fabricated composites are significantly higher than those of pure aluminum matrix, with a decrease of ductility. Mechanisms governing the tensile fracture process are also discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5187900','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/5187900"><span id="translatedtitle">Exploratory development in the system <span class="hlt">Al</span>-Sc-X</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Sawtell, R.R.; Morris, J.W. Jr.</p> <p>1988-01-01</p> <p>In the search for new structural materials, systems based on the cubic, <span class="hlt">Al</span>/sub 3/X phase show particular promise both as monolithic materials and as dispersions in an <span class="hlt">Al</span> matrix. One of the most interesting candidates is the <span class="hlt">Al</span>/sub 3/Sc phase which has been observed as a highly stable, coherent precipitate in <span class="hlt">Al</span> alloys. <span class="hlt">Al</span>-Sc-X alloys hardened by this phase have been shown to develop unique combinations of properties. This work examines the <span class="hlt">Al</span>(ss) ..-->.. <span class="hlt">Al</span>/sub 3/Sc phase transition for the purpose of predicting potential substitutes or replacements for Sc. Theoretical analyses of intermetallic compound formation and precipitation in the <span class="hlt">Al</span>-Sc-RE (RE = rare earth elements) are described as are the results of experimental evaluations of such systems. These results include descriptions of new <span class="hlt">Al</span>-Sc-RE alloys with tensile strengths as high as 310MPa (45 ksi); some of the highest levels attained in an <span class="hlt">Al</span> alloy on a per atom basis. 22 refs., 3 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SeScT..30e5015L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SeScT..30e5015L"><span id="translatedtitle">Unintentional gallium incorporation in <span class="hlt">Al</span>N and its impact on the electrical properties of GaN/<span class="hlt">Al</span>N and GaN/<span class="hlt">AlN/Al</span>GaN heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Haoran; Keller, Stacia; Chan, Silvia H.; Lu, Jing; DenBaars, Steven P.; Mishra, Umesh K.</p> <p>2015-05-01</p> <p>Thin <span class="hlt">Al</span>N interlayers are widely used in (In,<span class="hlt">Al</span>,Ga)N based high-electron-mobility transistors to improve the mobility of the two-dimensional electron gas forming at the GaN/(In,<span class="hlt">Al</span>,Ga)N interface. <span class="hlt">Al</span>N layers grown by metal-organic chemical vapor deposition, however, were recently shown to contain high amounts of gallium caused by carry over reactions, resulting in AlxGa1-xN layers with x ˜ 0.5 under typical deposition conditions. By modifying the <span class="hlt">Al</span>N growth conditions in this study, layers with an <span class="hlt">Al</span> mole fraction up to 0.78 were obtained. The unintentional Ga incorporation had a negligible effect on the electronic properties of GaN/<span class="hlt">AlN/Al</span>GaN structures with nominally 0.7 nm thick <span class="hlt">Al</span>N interlayer and sheet carrier densities in the order of 1 × 1013 cm-3. It resulted, however, in low electron mobility values for samples with thicker nominal <span class="hlt">Al</span>N layers and/or higher sheet carrier densities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6239660','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6239660"><span id="translatedtitle">The physical and mechanical properties of Ni<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Miracle, D.B. )</p> <p>1993-03-01</p> <p>A critical review of the physical and mechanical properties of Ni<span class="hlt">Al</span> is presented. The physical properties examined include electronic structure and bonding, crystal structure and phase stability, thermodynamic properties, elastic properties, and electrical, magnetic, and thermal properties. Discussion of crystal defects in Ni<span class="hlt">Al</span> include both constitutional and thermal point defects, the core structure and energy of line defects, and planar defects (shear faults, grain boundaries, and free surfaces). The mechanical properties, substructure, and mechanisms of ductility of Ni<span class="hlt">Al</span> single crystals and polycrystals are reviewed in detail, while alloying effects and the deformation of Ni<span class="hlt">Al</span> martensite are briefly described. The fracture toughness, modes of fracture, and cyclic properties reported in the literature are assessed. A critical analysis of diffusion data for Ni<span class="hlt">Al</span> is followed by a discussion of the activation energy and mechanisms of diffusion. This information is related to the creep properties of Ni<span class="hlt">Al</span>, and additional critical comments concerning the substructure and creep mechanisms of Ni<span class="hlt">Al</span> are provided. A review of the environmental resistance of Ni<span class="hlt">Al</span> is followed by a brief discussion of several current and potential applications of Ni<span class="hlt">Al</span>. Concluding remarks include suggestions for future research on Ni<span class="hlt">Al</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JEMat..44.1263W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JEMat..44.1263W"><span id="translatedtitle"><span class="hlt">AlGaN/Al</span>N-GaN-SL HEMTs with Multiple 2DEG Channels</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wille, Ada; Yacoub, Hady; Debald, Arne; Kalisch, Holger; Vescan, Andrei</p> <p>2015-05-01</p> <p>We report on a multichannel approach for <span class="hlt">Al</span>GaN/GaN high-electron-mobility transistors (HEMTs) to increase the carrier mobility in the low and high sheet carrier concentration regimes. Between the <span class="hlt">Al</span>GaN barrier and GaN buffer, alternating thin layers of <span class="hlt">Al</span>N and GaN were inserted to create multiple two-dimensional electron gas (2DEG) channels. All samples were grown by metalorganic vapor-phase epitaxy (MOVPE) on sapphire substrates and compared with conventional single-channel HEMT with the same sheet carrier concentration. For low total 2DEG carrier concentrations (<8 × 1012 cm-2), the mobility for the multichannel HEMT was enhanced due to a reduction of ionized impurity and dislocation scattering, which originates from a backbarrier effect of the underlying <span class="hlt">Al</span>N layers. In the high total carrier concentration regime (>8 × 1012 cm-2), a mobility improvement is attributed to distribution of the sheet charge into multiple 2DEG channels. This has been found to reduce the carrier concentration per individual channel, which leads to larger distance between 2DEG and heterointerfaces and therefore less impact of interface roughness and alloy scattering. With increasing number of channels, phonon scattering is also reduced due to lowering of the three-dimensional (3D) electron density, which results from the added volume of the multiple 2DEGs. With this approach, the HEMT mobility was increased from 1620 cm2 V-1 s-1 to 1960 cm2 V-1 s-1 for a triple-channel device at sheet carrier concentration of 7.5 × 1012 cm-2.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10107534','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10107534"><span id="translatedtitle">NMR study of nanophase <span class="hlt">Al/Al</span>-oxide powder and consolidated composites</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Suits, B.H.; Apte, P.; Wilken, D.E.; Siegel, R.W.</p> <p>1994-10-01</p> <p>{sup 27}<span class="hlt">Al</span> Nuclear Magnetic Resonance (NMR) measurements from aluminum powders and consolidated nanophase aluminum made from those powders are presented. The signals from the metal and surface oxidation are easily separated and are compared before and after consolidation. The results presented indicate that the oxide coating becomes the interface region within the nanophase composite material and that during consolidation the metal has undergone a deformation equivalent to that seen for bulk material under a compressive strain of between 4% and 8%.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013SPIE.8993E..06O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013SPIE.8993E..06O"><span id="translatedtitle">Near-infrared OPO in an <span class="hlt">AlGaAs/Al</span>Ox waveguide</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ozanam, C.; Savanier, M.; Lanco, L.; Lafosse, X.; Andronico, A.; Favero, I.; Ducci, S.; Leo, G.</p> <p>2013-12-01</p> <p>Within the ambitious quest for an electrically pumped version of the optical parametric oscillator (OPO), we demonstrate the first near-infrared integrated OPO in a direct gap semiconductor. This nonlinear device is based on a selectively oxidized GaAs/<span class="hlt">Al</span>As heterostructure, the same "<span class="hlt">Al</span>Ox" technology that is at the heart of VCSEL fabrication. The heterostructure and waveguide design allows for type-I form-birefringent phase matching, with a TM00 pump around 1 μm and TE00 signal and idler around 2 μm. Relying on the high non-resonant χ(2) of GaAs, relatively weak guided-wave optical losses, and monolithic SiO2/TiO2 dichroic Bragg mirrors, we observe a threshold of 210 mW at degeneracy in the continuous-wave regime, with a single-pass-pump doubly resonant scheme. Further improvement can be achieved by adopting a double-pump-pass scheme and, in a more fundamental way, by further optimizing the waveguide optical losses. The latter are induced by a not entirely mastered <span class="hlt">Al</span>As oxidation process and are of two distinct types: Rayleighlike scattering at signal and idler wavelength (α <= 1cm-1), due to the interface roughness between GaAs and <span class="hlt">Al</span>Ox layers; and absorption at pump wavelengths (α ≍ 3cm-1), due to volume defects in the GaAs layers adjacent to the aluminum oxide. This result marks a milestone for integrated nonlinear photonics and represents a significant step toward the goal of a broadly tunable coherent light source on chip.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3873619','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3873619"><span id="translatedtitle">Familial clustering of <span class="hlt">ALS</span> in a population-based resource</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Gibson, Summer B.; Figueroa, Karla P.; Bromberg, Mark B.; Cannon-Albright, Lisa</p> <p>2014-01-01</p> <p>Objective: To determine the extent of an inherited contribution to amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) mortality. Methods: Death certificates (DCs) from 1904 to 2009 were analyzed from patients with at least 3 generations recorded in the Utah Population Database, a genealogic and medical database of more than 2 million Utah residents. Among probands whose DCs listed <span class="hlt">ALS</span>, the relative risk (RR) of death with <span class="hlt">ALS</span> was determined among spouses and first- through fifth-degree relatives, using birth year-, sex-, and birthplace-matched cohorts. Results: Eight hundred seventy-three patients with <span class="hlt">ALS</span> met the inclusion criteria. Among 3,531 deceased first-degree relatives of probands, the RR of dying with <span class="hlt">ALS</span> was increased compared with control cohorts (RR = 4.91, 95% confidence interval 3.36, 6.94). The RR of dying with <span class="hlt">ALS</span> was also increased among 9,386 deceased second-degree relatives (RR = 2.85, 95% confidence interval 2.06, 3.84). The RR of dying with <span class="hlt">ALS</span> was not increased among third- through fifth-degree relatives. More affected first-degree relatives were male (p = 0.014). No cases of conjugal <span class="hlt">ALS</span> were observed. Conclusions: This study is suggestive of familial clustering in excess of expected for <span class="hlt">ALS</span>. Our results confirm the results of prior studies of familial <span class="hlt">ALS</span>, suggesting applicability of our findings to other mixed European populations. Furthermore, this work expands on previous studies by quantifying the RR of <span class="hlt">ALS</span> among more distant relatives. The use of mortality data obtained from DCs reduces the ascertainment and recall bias of many previous studies. Finally, the excess of <span class="hlt">ALS</span> among second-degree relatives and lack of conjugal <span class="hlt">ALS</span> are strongly supportive of a genetic contribution. PMID:24306004</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AIPC.1353.1379H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AIPC.1353.1379H"><span id="translatedtitle">Roll Casting of <span class="hlt">Al</span>-25%Si</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Haga, Toshio; Harada, Hideto; Watari, Hisaki</p> <p>2011-05-01</p> <p>Strip casting of <span class="hlt">Al</span>-25%Si strip was tried using an unequal diameter twin roll caster. The diameter of the lower roll (large roll) was 1000 mm and the diameter of the upper roll (small roll) was 250 mm. Roll material was mild steel. The sound strip could be cast at the speeds ranging from 8 m/min to 12 m/min. The strip did not stick to the roll without the parting material. The primary Si, which existed at centre area of the thickness direction, was larger than that which existed at other area. The size of the primary Si was smaller than 0.2 mm. Eutectic Si was smaller 5 ?m. The as-cast strip was ranging from 2 mm to 3 mm thick and its width was 100 mm. The as-cast strip could be hot rolled down to 1 mm. The hot rolled strip was cold rolled. The primary Si became smaller and the pore occurred around the primary Si after the rolling.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_21 --> <div id="page_22" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="421"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19960021028','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19960021028"><span id="translatedtitle">3DGRAPE/<span class="hlt">AL</span> User's Manual</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Sorenson, Reese L.; Alter, Stephen J.</p> <p>1995-01-01</p> <p>This document is a users' manual for a new three-dimensional structured multiple-block volume g generator called 3DGRAPE/<span class="hlt">AL</span>. It is a significantly improved version of the previously-released a widely-distributed programs 3DGRAPE and 3DMAGGS. It generates volume grids by iteratively solving the Poisson Equations in three-dimensions. The right-hand-side terms are designed so that user-specific; grid cell heights and user-specified grid cell skewness near boundary surfaces result automatically, with little user intervention. The code is written in Fortran-77, and can be installed with or without a simple graphical user interface which allows the user to watch as the grid is generated. An introduction describing the improvements over the antecedent 3DGRAPE code is presented first. Then follows a chapter on the basic grid generator program itself, and comments on installing it. The input is then described in detail. After that is a description of the Graphical User Interface. Five example cases are shown next, with plots of the results. Following that is a chapter on two input filters which allow use of input data generated elsewhere. Last is a treatment of the theory embodied in the code.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015NatPh..11..321A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015NatPh..11..321A"><span id="translatedtitle">Modulated magnetism in PrPt<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Abdul-Jabbar, Gino; Sokolov, Dmitry A.; O'Neill, Christopher D.; Stock, Christopher; Wermeille, Didier; Demmel, Franz; Krüger, Frank; Green, Andrew G.; Lévy-Bertrand, Florence; Grenier, Béatrice; Huxley, Andrew D.</p> <p>2015-04-01</p> <p>The transition between paramagnetism and ferromagnetism is the paradigm for a continuous phase transition at finite temperature. When such a transition is tuned to zero temperature in clean materials, the growth of low-energy zero-point fluctuations potentially drives an array of phenomena, including the formation of novel states such as non-conventional superconductivity. Experimentally, the growth of the fluctuations, however, is curtailed and the transition becomes discontinuous as its temperature is reduced. This is understood to arise from non-analytic corrections to the free energy that always occur. In a recent theory, changes of the excitation spectrum are self-consistently considered alongside the ground state. This analysis reveals that a transition to a new state may be an alternative outcome. As the excitation spectrum (the `disorder’) is pivotal to promoting the new `order’ this mechanism is referred to as `order by disorder’. Here, we report the discovery of modulated order in PrPt<span class="hlt">Al</span>, consistent with complex spirals, at the boundary between paramagnetism and ferromagnetism, giving the first clear experimental realization of such a state.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19910016882','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19910016882"><span id="translatedtitle"><span class="hlt">ALS</span> liquid hydrogen turbopump: Advanced Development Program</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Shimp, Nancy R.; Claffy, George J.</p> <p>1989-01-01</p> <p>The point of departure (POD) turbopump concept was reviewed and finalized. The basis for the POD was the configuration presented in the Aerojet proposal. After reviewing this proposal concept, several modifications were made. These modifications include the following: (1) the dual pump discharge arrangement was changed to a single discharge; (2) commonality of the turbine inlet manifold with the advanced launch system (<span class="hlt">ALS</span>) liquid oxygen (LOX) TPA was dropped for this program; (3) the turbine housing flange arrangement was improved by relocating it away from the first stage nozzles; (4) a ten percent margin (five percent diameter increase) was built into the impeller design to ensure meeting the required discharge pressure without the need for increasing speed; (5) a ten percent turbine power margin was imposed which is to be obtained by increasing turbine inlet pressure if required; and (6) the backup concept, as an alternative to the use of cast impellers, now incorporates forged/machined shrouded impellers, rather than the unshrouded type originally planned.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1982EOSTr..63..571L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1982EOSTr..63..571L"><span id="translatedtitle">Disziplingeschichte <span class="hlt">als</span> wissenschaftliche Selbstreflexion der historischen Wissenschaftsforschung</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Landsberg, H. E.</p> <p></p> <p>This monograph, Disziplingeschichte <span class="hlt">als</span> wissenschaftliche Selbstreflexion der historischen Wissenschaftsforschung: Eine Darstellung unter Heranziehung von Fallstudien der Wissenschaftsgeschichte der Geophysik, is principally concerned with the problem of how scientific disciplines develop. The historical aspects of geophysics and meteorology, as they became separated from the classical sciences of geography, physics, and astronomy, are the principal topics of discussion. There are three main sections.In the first the author traces some of the symptoms that characterize the emergence of an independent branch of science. These include establishment of journals specifically focused on advances in the specialty, the appearance of personalities with pioneering research, and organizations devoted to the particular field. In touching on these elements in the context of geophysics, a particular aspect becomes immediately obvious. It is the arising need for international cooperation. In the last century this was demonstrated by the establishment of the International Meteorological Organization in 1873 and the 11-nation venture of the International Polar Year 1882/83. It also becomes clear that geophysics is distinctly different from the laboratory sciences because it is notably steered by external events such as the Krakatoa eruption 1883, major earthquakes, notable floods, etc.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013PMM...114..327G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013PMM...114..327G"><span id="translatedtitle">Mechanical spectroscopy of <span class="hlt">Al</span>-Mg alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Golovin, I. S.; Bychkov, A. S.; Medvedeva, S. V.; Hu, X. S.; Zheng, M. Y.</p> <p>2013-04-01</p> <p>The internal friction of deformed, annealed, and quenched <span class="hlt">Al</span>-Mg alloys with Mg contents of 0-12 wt % has been studied as a function of temperature. The measurements have been performed in the range of 25-580°C at 0.3-30 Hz using a DMA Q800 TA Instruments dynamic mechanical analyzer at the maximum amplitude of deformation ?0 = 5 × 10-5. In annealed alloys with Mg contents up to 5 %, a relaxation IF peak with activation parameters (activation energy H ? 1.7-2.1 eV) has been detected. In alloys with 8-12% Mg, this relaxation peak is absent and, at a lower temperature, another IF peak appears (with an activation energy H of about 1 eV), which is interpreted as the Zener peak in terms of the combination of activation parameters. The article discusses the nature of these peaks and the influence of alloying on the relaxation mechanisms. In cold-worked alloys, an IF pseudo-peak takes place, which is related to the recrystallization of samples, and its temperature position in the alloys that contain more than 5% Mg depends not only on the degree of deformation, but also on the dissolution temperature of the ? phase.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JMiMi..25c5025M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JMiMi..25c5025M"><span id="translatedtitle">Impact of SiO2 on <span class="hlt">Al-Al</span> thermocompression wafer bonding</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Malik, Nishant; Schjølberg-Henriksen, Kari; Poppe, Erik U.; Taklo, Maaike M. V.; Finstad, Terje G.</p> <p>2015-03-01</p> <p><span class="hlt">Al-Al</span> thermocompression bonding suitable for wafer level sealing of MEMS devices has been investigated. This paper presents a comparison of thermocompression bonding of <span class="hlt">Al</span> films deposited on Si with and without a thermal oxide (SiO2 film). Laminates of diameter 150?mm containing device sealing frames of width 200?µm were realized. The wafers were bonded by applying a bond force of 36 or 60?kN at bonding temperatures ranging from 300-550?°C for bonding times of 15, 30 or 60?min. The effects of these process variations on the quality of the bonded laminates have been studied. The bond quality was estimated by measurements of dicing yield, tensile strength, amount of cohesive fracture in Si and interfacial characterization. The mean bond strength of the tested structures ranged from 18-61?MPa. The laminates with an SiO2 film had higher dicing yield and bond strength than the laminates without SiO2 for a 400?°C bonding temperature. The bond strength increased with increasing bonding temperature and bond force. The laminates bonded for 30 and 60?min at 400?°C and 60?kN had similar bond strength and amount of cohesive fracture in the bulk silicon, while the laminates bonded for 15?min had significantly lower bond strength and amount of cohesive fracture in the bulk silicon.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/2519560','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/2519560"><span id="translatedtitle">The influence of advertising on tobacco consumption: some problems with Chetwynd et <span class="hlt">al.'s</span> analysis.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Jackson, J D; Ekelund, R B</p> <p>1989-11-01</p> <p>In a recent study of the relationship between cigarette advertising and the aggregate consumption of cigarettes in New Zealand between 1973 and 1985, Chetwynd et <span class="hlt">al</span>. (1988) argue that quarterly data suggest that advertising affects overall consumption of cigarettes with an elasticity of +0.07. In addition, they argue that advertising has a 'carry over' effect of about four quarters on current consumption. These results are potentially important for two reasons. Although the evidence is mixed, the conventional view is that cigarette advertising affects brand choice among smokers but not aggregate demand for cigarettes. Chetwynd et <span class="hlt">al.'s</span> results, (hereafter, Chetwynd) contradict this traditional view. Secondly, if advertising does increase the aggregate demand for cigarettes, then a public policy banning cigarette advertising might reduce aggregate demand for cigarettes. Unfortunately, the Chetwynd, study is sufficiently flawed with conceptual and econometric problems that their inference that advertising increases cigarette demand is questionable. Certainly cigarette advertising may increase or decrease cigarette consumption. The point we wish to make is that, any inference one way or the other based on the results of Chetwynd, cannot be viewed as well-grounded in either scientific methodology or statistical principles. PMID:2519560</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1009339','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1009339"><span id="translatedtitle">Creep in {alpha}-<span class="hlt">Al</span>{sub 2}O{sub 3} thermally grown on {beta}-Ni<span class="hlt">Al</span> and Ni<span class="hlt">Al</span>Pt alloys.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Veal, B. W.; Paulikas, A. P.; Gleeson, B.; Hou, P. Y.</p> <p>2007-12-01</p> <p>We have measured creep relaxation in {alpha}-<span class="hlt">Al</span>{sub 2}O{sub 3}, thermally grown on stoichiometric {beta}-Ni<span class="hlt">Al</span>, and on {beta}- and {gamma}{prime}-phase alloys of Ni-<span class="hlt">Al</span>-Pt at temperatures between 950-1100 C. Creep was monitored using in-situ measurements of strain relaxation in the oxide following the sudden imposition of a stress. A stress was imposed by abruptly changing the sample temperature, exploiting the thermal expansion difference between oxide and substrate. The in-plane elastic strain was obtained using a sin{sup 2}{psi} X-ray diffraction technique exploiting synchrotron radiation. For oxides grown on {beta}-Ni<span class="hlt">Al</span> and Ni-<span class="hlt">Al</span>-Pt samples, we found that strain relaxation rates are comparable to those observed in fine grained {alpha}-<span class="hlt">Al</span>{sub 2}O{sub 3} bulk ceramics, when bulk results are extrapolated to the lower temperatures examined here. When Hf was added to the Ni-<span class="hlt">Al</span>-Pt alloy, creep rates in the thermally grown oxide were substantially slowed. Creep rates at stress levels of 100 MPa, or less, are proportional to on, with n {le} 2, consistent with a diffusional creep mechanism.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3569176','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3569176"><span id="translatedtitle">Na3<span class="hlt">Al</span>(AsO4)2</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Fakhar Bourguiba, Noura; Zid, Mohamed Faouzi; Driss, Ahmed</p> <p>2013-01-01</p> <p>The structure of the title compound tris­odium aluminium bis­(arsenate), Na3<span class="hlt">Al</span>(AsO4)2, is built up from <span class="hlt">Al</span>O4 and AsO4 corner-sharing tetra­hedra, forming an undulating two-dimensional framework parallel to (100). The layers are constituted of large <span class="hlt">Al</span>6As6O36 rings made up from six <span class="hlt">Al</span>O4 and AsO4 tetra­hedra in which two sodium cations are situated, the third sodium cation being located in the inter­layer space. The structural relationships between the title compound and Na3Fe(PO4)2, Na<span class="hlt">Al</span>Co(PO4)2 and <span class="hlt">Al</span>5Co3(PO4)8 are discussed. PMID:23424394</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009JCrGr.311.3147B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009JCrGr.311.3147B"><span id="translatedtitle">Sc<span class="hlt">Al</span>N nanowires: A cathodoluminescence study</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bohnen, T.; Yazdi, G. R.; Yakimova, R.; van Dreumel, G. W. G.; Hageman, P. R.; Vlieg, E.; Algra, R. E.; Verheijen, M. A.; Edgar, J. H.</p> <p>2009-05-01</p> <p>Wurtzite Sc<span class="hlt">Al</span>N nanowires, grown on a scandium nitride (ScN) thin film by hydride vapor phase epitaxy (HVPE), were analyzed by energy dispersive analysis of X-rays (EDX), CL, high resolution transmission electron spectroscopy (HRTEM), and scanning electron microscopy (SEM). The wires were grown along the [0 0 0 1] axis, had an average length of 1 ?m, a diameter between 50 and 150 nm, and a Sc<span class="hlt">Al</span>N composition with a 95:5 <span class="hlt">Al</span>:Sc ratio. Cathodoluminescence studies on the individual wires showed a sharp emission near 2.4 eV, originating from the Sc atoms in the aluminum nitride (<span class="hlt">Al</span>N) matrix. The formation of such a semiconducting Sc<span class="hlt">Al</span>N alloy could present a new alternative to In<span class="hlt">Al</span>N for optoelectronic applications operating in the 200-550 nm range.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20352898','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20352898"><span id="translatedtitle">Charging effect of aluminum nitride thin films containing <span class="hlt">Al</span> nanocrystals.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Liu, Y; Chen, T P; Ding, L; Wong, J I; Yang, M; Liu, Z; Li, Y B; Zhang, S</p> <p>2010-01-01</p> <p>In this work, the <span class="hlt">Al</span>-rich AIN thin film is deposited on Si substrate by radio frequency (RF) sputtering to form a metal-insulator-semiconductor (MIS) structure. <span class="hlt">Al</span> nanocrystals (nc-<span class="hlt">Al</span>) are formed and embedded in the AIN thin film. Charge trapping/detrapping in the nc-<span class="hlt">Al</span> leads to a shift in the flat-band voltage (VFB) of the MIS structure. The charge storage ability of the AIN thin films containing <span class="hlt">Al</span> nanocrystals provides the possibility of memory applications. On the other hand, charge trapping in nc-<span class="hlt">Al</span> reduces the current conduction because of the breaking of some tunneling paths due to Coulomb blockade effect and the current conduction evolves with a trend towards one-dimensional transport. PMID:20352898</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25289585','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25289585"><span id="translatedtitle">A fruitful endeavor: modeling <span class="hlt">ALS</span> in the fruit fly.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Casci, Ian; Pandey, Udai Bhan</p> <p>2015-05-14</p> <p>For over a century Drosophila melanogaster, commonly known as the fruit fly, has been instrumental in genetics research and disease modeling. In more recent years, it has been a powerful tool for modeling and studying neurodegenerative diseases, including the devastating and fatal amyotrophic lateral sclerosis (<span class="hlt">ALS</span>). The success of this model organism in <span class="hlt">ALS</span> research comes from the availability of tools to manipulate gene/protein expression in a number of desired cell-types, and the subsequent recapitulation of cellular and molecular phenotypic features of the disease. Several Drosophila models have now been developed for studying the roles of <span class="hlt">ALS</span>-associated genes in disease pathogenesis that allowed us to understand the molecular pathways that lead to motor neuron degeneration in <span class="hlt">ALS</span> patients. Our primary goal in this review is to highlight the lessons we have learned using Drosophila models pertaining to <span class="hlt">ALS</span> research. This article is part of a Special Issue entitled <span class="hlt">ALS</span> complex pathogenesis. PMID:25289585</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AGUFMMR41B4397S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AGUFMMR41B4397S"><span id="translatedtitle">Thermoelasticity of <span class="hlt">Al</span>3+- and Fe3+-bearing bridgemanite</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shukla, G.; Wentzcovitch, R. M.</p> <p>2014-12-01</p> <p>We present quasi-harmonic LDA+U calculations of thermoelastic properties of Fe3+- and <span class="hlt">Al</span>3+-bearing bridgemanite (MgSiO3), the main phase of the Earth's lower mantle, at relevant P,T conditions and compositions. Four charge-coupled substitutions, namely, <span class="hlt">Al</span>3+-<span class="hlt">Al</span>3+, Fe3+-Fe3+, Fe3+-<span class="hlt">Al</span>3+, and <span class="hlt">Al</span>3+-Fe3+have been studied. Aggregate elastic moduli and sound velocities are compared with available experimental measurements. In the case of the Fe3+-Fe3+ substitution, the effect of pressure induced high-spin (HS) to low-spin (LS) crossover in the B-site iron has been investigated in great detail. Using these results, we analyze the possible influence of <span class="hlt">Al</span> and Fe on lower mantle velocity heterogeneities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20030112241','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20030112241"><span id="translatedtitle">Cost-Effective Ti<span class="hlt">Al</span> based Materials</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Moxson, V. S.; Sun, Fusheng; Draper, Susan L.; Froes, F. H.; Duz, V.</p> <p>2003-01-01</p> <p>Because of their inherent low ductility, Ti<span class="hlt">Al</span>-based materials are difficult to fabricate, especially thin gage titanium gamma aluminide (Ti<span class="hlt">Al</span>) sheet and foil. In this paper, an innovative powder metallurgy approach for producing cost-effective thin gage Ti<span class="hlt">Al</span> sheets (with 356 mm long and 235 mm wide, and a thickness of 0.74, 1.09, 1.55, and 2.34 mm, respectively) is presented. The microstructures and tensile properties at room and elevated temperatures of the thin gage Ti<span class="hlt">Al</span> are studied. Results show that these Ti<span class="hlt">Al</span> sheets have a relatively homogenous chemistry, uniform microstructure, and acceptable mechanical properties. This work demonstrates a cost-effective method for producing both flat products (sheet/foil) and complex chunky parts of Ti<span class="hlt">Al</span> for various advanced applications including aerospace and automotive industries.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/983100','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/983100"><span id="translatedtitle">Reactive codoping of Ga<span class="hlt">Al</span>InP compound semiconductors</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Hanna, Mark Cooper (Boulder, CO); Reedy, Robert (Golden, CO)</p> <p>2008-02-12</p> <p>A Ga<span class="hlt">Al</span>InP compound semiconductor and a method of producing a Ga<span class="hlt">Al</span>InP compound semiconductor are provided. The apparatus and method comprises a GaAs crystal substrate in a metal organic vapor deposition reactor. <span class="hlt">Al</span>, Ga, In vapors are prepared by thermally decomposing organometallic compounds. P vapors are prepared by thermally decomposing phospine gas, group II vapors are prepared by thermally decomposing an organometallic group IIA or IIB compound. Group VIB vapors are prepared by thermally decomposing a gaseous compound of group VIB. The <span class="hlt">Al</span>, Ga, In, P, group II, and group VIB vapors grow a Ga<span class="hlt">Al</span>InP crystal doped with group IIA or IIB and group VIB elements on the substrate wherein the group IIA or IIB and a group VIB vapors produced a codoped Ga<span class="hlt">Al</span>InP compound semiconductor with a group IIA or IIB element serving as a p-type dopant having low group II atomic diffusion.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21371700','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21371700"><span id="translatedtitle">Corrosion Behaviour of <span class="hlt">Al</span> Alloys in Sea Water</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kamarudin, S. R. M.; Daud, M.; Muhamad, A.; Sattar, M. S.; Daud, A. R.</p> <p>2010-03-11</p> <p>The electrochemical behaviour of aluminum (<span class="hlt">Al</span>) alloys in seawater medium was investigated using potentiodynamic technique, complemented by Scanning Electron Microscopy (SEM) and EDAX. SEM was used to characterize the corroded surface and to observe the extent of corrosion attack on the <span class="hlt">Al</span> alloys after tested in seawater. EDAX analysis was used to identify elements present on the specimen surface. The results indicate that influences of alloying elements present in the <span class="hlt">Al</span> alloys play important role in the corrosion of <span class="hlt">Al</span> alloys in seawater. The behaviour of <span class="hlt">Al</span> alloys with addition of Zn, Sn, Cu and Si was greatly enhanced in terms of its potential and corrosion behaviour. Potential of <span class="hlt">Al</span> with alloying elements reached value more negative than -0.9 V{sub SCE} and showed active corrosion behaviour.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003APS..MARY15012C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003APS..MARY15012C"><span id="translatedtitle">Iron d-band occupancy in Ni<span class="hlt">Al</span> intermetallics</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chisholm, M. F.; Fu, C. L.; Liu, C. T.</p> <p>2003-03-01</p> <p>Iron when sitting at <span class="hlt">Al</span> sites in intermetallic Ni<span class="hlt">Al</span> has been shown to expand the lattice and produce an unusual solid solution softening effect. First-principles calculations predict that an Fe atom develops a large magnetic moment and an expanded effective atomic size when it occupies a site on the <span class="hlt">Al</span>-sublattice(1). In this study, electron energy loss spectroscopy was used to examine the magnetic characteristics of Fe substituted on the Ni and <span class="hlt">Al</span> sites in the B2 ordered Ni<span class="hlt">Al</span> compound. We have found a higher L-edge branching ratio for Fe when on the <span class="hlt">Al</span> site compared to Fe on the Ni site. This corresponds to an enhanced magnetic moment of Fe confirming the theoretical predication. (1) C.T. Liu, C.L. Fu, L.M.Pike and D.S. Easton, Acta Materialia 50 3203 (2002).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013PhPro..50..206Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013PhPro..50..206Z"><span id="translatedtitle">Preparation of <span class="hlt">Al</span>-Cr-Fe Coatings by Heat Treatment of Electrodeposited Cr/<span class="hlt">Al</span> Composite Coatings</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Min; Chen, Chang'an; Zhang, Guikai; Rao, Yongchu; Ling, Guoping</p> <p></p> <p><span class="hlt">Al</span>-Cr-Fe coatings have been widely used in the surface engineering field of materials, due to their excellent corrosion resistance to water vapor and fused salt deposits. In this study, a new two-step approach was developed to prepare <span class="hlt">Al</span>-Cr-Fe coatings on surfaces of SUS430 stainless steels. First, the Cr/<span class="hlt">Al</span> composite coatings were prepared by electrodepositing Cr from aqueous solution then electrodepositing <span class="hlt">Al</span> from <span class="hlt">Al</span>Cl3-1-ethyl-3-methyl-imidazolium chloride (<span class="hlt">Al</span>Cl3-EMIC) ionic liquid on SUS430 stainless steel substrate. In the second, heat treatment of the Cr/<span class="hlt">Al</span> composite coatings was carried out to acquire <span class="hlt">Al</span>-Cr-Fe coatings. Effects of the thickness of Cr/<span class="hlt">Al</span> composite coatings, the time and temperature of heat treatment on composition and phase structure of alloy layers were studied by using scanning electron microscope (SEM), backscattered electron (BSE), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The structure transformation process and formation mechanism of <span class="hlt">Al</span>-Cr-Fe coatings were discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JMEP...23.3425A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JMEP...23.3425A"><span id="translatedtitle">Influence of Mixing Technique on the Mechanical Properties and Structural Evolution of <span class="hlt">Al-NiAl</span> Composites</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Abd Elhamid, M.; Emara, Mohamed M.; Salem, Hanadi G.</p> <p>2014-10-01</p> <p>Fabrication and processing of 99.7% purity aluminum powder reinforced with 0, 5, 10% volume fractions Ni<span class="hlt">Al</span> intermetallic metal matrix composites were conducted. The mechanically alloyed nanostructured Ni<span class="hlt">Al</span> was mixed by both regular and high energy ball milling techniques. Powders of Ni<span class="hlt">Al</span> employed for reinforcement were milled for 18 and 31 h, and therefore denoted as Ni<span class="hlt">Al</span>18 and Ni<span class="hlt">Al</span>31, respectively. The mixed powders were consolidated via a combination of cold pressing followed by hot extrusion at 480 °C for 1 h at a reduction ratio 4:1. Hardness, tensile properties, and fracture behavior of the extruded composite powders were evaluated. Structural evolution of the milled composite powders was investigated before and after extrusion using optical microscopy, field emission scanning, and transmission electron microscopy. In addition, particle type identification was carried out via energy dispersive x-ray analysis. Introducing Ni<span class="hlt">Al</span>31 (0.8 µm) enhanced the mechanical properties of the composites compared to Ni<span class="hlt">Al</span>18 (1.0 µm). Moreover, powders milling enhanced the tensile properties post hot extrusion compared to the mixed conditions due to the enhanced reinforcement distribution and bonding with the <span class="hlt">Al</span> matrices. Hot extruded milled composite powders of <span class="hlt">Al</span> reinforced with 10% Ni<span class="hlt">Al</span>31 produced nanostructured high-angle grain boundary structure <200 nm.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20788121','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20788121"><span id="translatedtitle">X-ray absorption spectroscopy studies on magnetic tunnel junctions with <span class="hlt">Al</span>O and <span class="hlt">Al</span>N tunnel barriers</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mun, B. S.; Moon, J. C.; Hong, S. W.; Kang, K. S.; Kim, K.; Kim, T. W.; Ju, H. L.</p> <p>2006-04-15</p> <p>X-ray photoelectron spectroscopy (XPS) and x-ray absorption spectroscopy (XAS) measurements of the optimized magnetic tunnel junctions (MTJs) with <span class="hlt">Al</span>O and <span class="hlt">Al</span>N barriers have been performed to study the chemical structures of the barrier and the underlying layer. These MTJs with <span class="hlt">Al</span>O and <span class="hlt">Al</span>N barriers exhibited increased tunneling magnetoresistance (TMR) after annealing at 200 deg. C from 27% to 45% and from 25% to 33%, respectively. Surprisingly, the XPS and XAS measurements confirmed that both the as-grown and the annealed MTJs had metallic Co and Fe at the interface between the barrier and the underlying CoFe layer. After annealing, under-stoichiometric <span class="hlt">Al</span>O{sub x} and <span class="hlt">Al</span>N{sub x} phases in MTJs with <span class="hlt">Al</span>O and <span class="hlt">Al</span>N barriers partially transformed into stoichiometric <span class="hlt">Al</span>{sub 2}O{sub 3} and <span class="hlt">Al</span>N phases, respectively. Thus the increase in TMR after annealing for MTJs with clean interface between the barrier and the underlying layer is believed due to the anion redistribution inside the barrier layer, not from back diffusion from pinned magnetic layer to barrier layer.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_22 --> <div id="page_23" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="441"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014SuScT..27k5015S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014SuScT..27k5015S"><span id="translatedtitle">Characterization of superconducting single-electron transistors with small <span class="hlt">Al/Al</span>O_{x}/V Josephson junctions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shimada, Hiroshi; Miyawaki, Kenji; Hagiwara, Ayano; Takeda, Kouichi; Mizugaki, Yoshinao</p> <p>2014-11-01</p> <p>Superconducting single-electron transistors (SSETs) composed of small <span class="hlt">Al/Al</span>Ox/V junctions were fabricated, and their transport properties were investigated. The device with an <span class="hlt">Al</span> island exhibited a supercurrent that was 2e-periodic in the gate charge while that with a V island showed a periodicity of e, where e is an elementary charge. The Josephson-quasiparticle (JQP)-cycle current appeared at the bias voltage V in the range {{? }<span class="hlt">Al</span>}+{{E}c}\\lt e|V|\\lt {{? }<span class="hlt">Al</span>}+3{{E}c}, where {{? }<span class="hlt">Al</span>} is the superconducting gap of <span class="hlt">Al</span> and {{E}c} is the charging energy of an elementary charge. This is different from the commonly accepted range for the JQP current such as that in the case of an all <span class="hlt">Al</span> SSET. There also appeared a large leakage current at 2{{? }<span class="hlt">Al</span>}?slant e|V|\\lt 2({{? }V}+{{? }<span class="hlt">Al</span>}+{{E}c}), where {{? }V} is the superconducting gap of V. All these properties are accounted for by considering the finite subgap quasiparticle density of states in the V electrode.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JaJAP..54k0303W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JaJAP..54k0303W"><span id="translatedtitle">Interfacial and electrical characterization of HfO2/<span class="hlt">Al</span>2O3/In<span class="hlt">Al</span>As structures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wu, Li-fan; Zhang, Yu-ming; Lu, Hong-liang; Zhang, Yi-men</p> <p>2015-11-01</p> <p>The HfO2/<span class="hlt">Al</span>2O3 double layer has been deposited by the atomic layer deposition (ALD) technique to a In<span class="hlt">Al</span>As epitaxial layer. The chemical composition at the interface was revealed by angle-resolved X-ray photoelectron spectroscopy (XPS). The electrical properties of the ALD-HfO2/<span class="hlt">Al</span>2O3/In<span class="hlt">Al</span>As metal–oxide–semiconductor (MOS) capacitor have been investigated and compared with those of the ALD-HfO2/In<span class="hlt">Al</span>As capacitor. It is demonstrated that the insertion of the <span class="hlt">Al</span>2O3 layer can decrease interfacial oxidation and trap charge formation. Compared with the HfO2/In<span class="hlt">Al</span>As capacitor, the HfO2/<span class="hlt">Al</span>2O3/In<span class="hlt">Al</span>As capacitor exhibits better electrical properties with reduced hysteresis and decreasing stretch-out of the capacitance–voltage (C–V) characteristics, and the oxide trapped charge (Qot) value is significantly decreased after inserting the <span class="hlt">Al</span>2O3 interlayer.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015ApSS..331....1Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015ApSS..331....1Z"><span id="translatedtitle">Preparation and characterization of ?-<span class="hlt">Al</span>2O3 film by low temperature thermal oxidation of <span class="hlt">Al</span>8Cr5 coating</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Min; Xu, Bajin; Ling, Guoping</p> <p>2015-03-01</p> <p>In this paper, ?-<span class="hlt">Al</span>2O3 film was prepared by low temperature thermal oxidation of <span class="hlt">Al</span>8Cr5 coating. The <span class="hlt">Al</span>8Cr5 alloy coating was prepared on SUS430 stainless steel through a two-step approach including electrodepositing Cr/<span class="hlt">Al</span> composite coating and subsequent heat treatment at 740 °C for 16 h. After mechanical polishing removal of voids on the surface, the <span class="hlt">Al</span>8Cr5 coating was thermal oxidized at 720 °C in argon for 100 h. The samples were characterized by SEM, EDX, XRD, XPS and TEM. XPS detection on the surface of oxidized <span class="hlt">Al</span>8Cr5 coating showed that the oxide film mainly consisted of <span class="hlt">Al</span>2O3. TEM characterization of the oxide film showed that it was ?-<span class="hlt">Al</span>2O3 films ca. 110 nm. The formation of ?-<span class="hlt">Al</span>2O3 films at low temperature can be attributed to the formation of Cr2O3 nuclei at the initial stage of oxidation which lowers the nucleation energy barrier of ?-<span class="hlt">Al</span>2O3.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JPhCS.592a2093K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JPhCS.592a2093K"><span id="translatedtitle">93Nb- and 27<span class="hlt">Al</span>-NMR/NQR studies of the praseodymium based PrNb2<span class="hlt">Al</span>20</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kubo, Tetsuro; Kotegawa, Hisashi; Tou, Hideki; Higashinaka, Ryuji; Nakama, Akihiro; Aoki, Yuji; Sato, Hideyuki</p> <p>2015-03-01</p> <p>We report a study of 93Nb- and 27<span class="hlt">Al</span>-nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) in a praseodymium based compound PrNb2<span class="hlt">Al</span>20. The observed NMR line at around 3 T and 30 K shows a superposition of typical powder patterns of one Nb signal and at least two <span class="hlt">Al</span> signals. 93Nb-NMR line could be reproduced by using the previously reported NQR frequency ?Q ? 1.8MHz and asymmetry parameter ? ? 0 [Kubo T et <span class="hlt">al</span> 2014 JPS Conf. Proc. 3 012031]. From 27<span class="hlt">Al</span>-NMR/NQR, NQR parameters are obtained to be ?Q,A ? 1.53 MHz, and ?A ? 0.20 for the site A, and ?Q,B ? 2.28 MHz, and ?B ? 0.17 for the site B. By comparing this result with the previous 27<span class="hlt">Al</span>-NMR study of PrT2<span class="hlt">Al</span>20 (T = Ti, V) [Tokunaga Y et <span class="hlt">al</span> 2013 Phys. Rev. B 88 085124], these two <span class="hlt">Al</span> site are assigned to the two of three crystallographycally inequivalent <span class="hlt">Al</span> sites.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/17059525','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/17059525"><span id="translatedtitle">TEM and HREM study of <span class="hlt">Al</span>3Zr precipitates in an <span class="hlt">Al</span>-Mg-Si-Zr alloy.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Lityñska, L; Abou-Ras, D; Kostorz, G; Dutkiewicz, J</p> <p>2006-09-01</p> <p>The structure of <span class="hlt">Al</span>(3)Zr precipitates in <span class="hlt">Al</span>-1.0Mg-0.6Si-0.5Zr (in wt.%) alloy was investigated using conventional transmission electron microscopy (TEM) and high-resolution TEM (HREM). After annealing of the alloy in the temperature range 450-540 degrees C, spherical precipitates of metastable L1(2)-<span class="hlt">Al</span>(3)Zr phase appeared nearly homogeneously within the matrix, and elongated particles were found at grain boundaries. L1(2)-structured <span class="hlt">Al</span>(3)Zr were about 20-30 nm in diameter and coherent with the matrix. Inside some of them, planar faults parallel to {100} planes were revealed by use of HREM. Most probably, these faults are an indication of the transition stage of transformation to the stable D0(23)-type <span class="hlt">Al</span>(3)Zr phase. The elongated precipitates (about 100 nm) were identified as D0(22)-type <span class="hlt">Al</span>(3)Zr. Energy-dispersive X-ray analysis showed that they contain, apart from <span class="hlt">Al</span>, mainly Zr with small amounts of Si. The substitution of <span class="hlt">Al</span> by Si increased the stability of the D0(22)-<span class="hlt">Al</span>(3)Zr as compared with D0(23)-<span class="hlt">Al</span>(3)Zr. PMID:17059525</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21182602','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21182602"><span id="translatedtitle">Electrical and structural properties of <span class="hlt">Al</span>N/GaN and <span class="hlt">Al</span>GaN/GaN heterojunctions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Polyakov, A. Y.; Smirnov, N. B.; Govorkov, A. V.; Markov, A. V.; Yugova, T. G.; Dabiran, A. M.; Wowchak, A. M.; Cui, B.; Osinsky, A. V.; Chow, P. P.; Pearton, S. J.; Scherbatchev, K. D.; Bublik, V. T.</p> <p>2008-09-01</p> <p>The electrical and structural properties of <span class="hlt">Al</span>N/GaN heterostructures grown by molecular beam epitaxy on sapphire are compared with those of <span class="hlt">Al</span>GaN/GaN heterostructures. The structural characteristics as assessed by x-ray diffraction show little difference but the electron density in the two-dimensional electron gas is about twice higher for <span class="hlt">Al</span>N/GaN structures with only slightly lower mobility than in <span class="hlt">Al</span>GaN/GaN. By proper choice of the Fe doping in GaN(Fe) and the thickness of unintentionally doped GaN layers, the composite buffer of the structure can be made semi-insulating. The current through the <span class="hlt">Al</span>N/GaN structures is determined by tunneling through the <span class="hlt">Al</span>N barrier and is much higher than that for <span class="hlt">Al</span>GaN/GaN films due to the lower thickness of <span class="hlt">Al</span>N compared to <span class="hlt">Al</span>GaN. Increasing the thickness of <span class="hlt">Al</span>N from 3 to 4 nm decreases the leakage current by about an order of magnitude.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10120132','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10120132"><span id="translatedtitle">Fabrication, phase transformation studies and characterization of SiC-<span class="hlt">AlN-Al</span>{sub 2}OC ceramics. Progress report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Virkar, A.V.</p> <p>1992-01-12</p> <p>SiC and <span class="hlt">Al</span>N are two of the important high temperature structural ceramics. <span class="hlt">Al</span>N and the 2H polytype of SiC are isostructural. Prior work has shown that they form an extension solid solution at temperatures {ge} 2000{degrees}C. At lower temperatures, the solid solution can undergo phase separation. Additionally, <span class="hlt">Al</span>{sub 2}OC is also isostructural and can form extensive solid solutions with SiC and <span class="hlt">Al</span>N. The formation of solid solutions in such refractory materials as well as the tendency to undergo diffusional phase transformations suggests that a potential exists to improve properties through alloying. The principal objective of the proposed work is to examine phase relations, phase transformations, the resulting precipitate morphologies and their influence on mechanical properties of SiC-<span class="hlt">AlN-Al</span>{sub 2}OC ceramics. Formation of modulated structures have been documented in SiC-<span class="hlt">Al</span>N ceramics in our work. It has been shown that modulations occur along directions other than the [0001] direction and this results in the formation of a tweed type of a microstructure. In the <span class="hlt">AlN-Al</span>{sub 2}OC system, the occurrence of cellular precipitates as well as coherent, disc-shaped precipitates has been observed. During the past year, work has progressed in the following areas: (1) Phase separation in SiC-<span class="hlt">Al</span>N system: The effect of coherency strain energy on the precipitate morphology. (2) High temperature creep of SiC-<span class="hlt">Al</span>N ceramics containing modulated structures and SiC-<span class="hlt">Al</span>{sub 2}OC ceramics. (3) Fabrication and characterization of damage-resistant SiC-<span class="hlt">Al</span>N ceramics. Three manuscripts have been submitted for publication.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/5932831','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/5932831"><span id="translatedtitle">Fabrication, phase transformation studies and characterization of SiC-<span class="hlt">AlN-Al</span> sub 2 OC ceramics</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Virkar, A.V.</p> <p>1992-01-12</p> <p>SiC and <span class="hlt">Al</span>N are two of the important high temperature structural ceramics. <span class="hlt">Al</span>N and the 2H polytype of SiC are isostructural. Prior work has shown that they form an extension solid solution at temperatures {ge} 2000{degrees}C. At lower temperatures, the solid solution can undergo phase separation. Additionally, <span class="hlt">Al</span>{sub 2}OC is also isostructural and can form extensive solid solutions with SiC and <span class="hlt">Al</span>N. The formation of solid solutions in such refractory materials as well as the tendency to undergo diffusional phase transformations suggests that a potential exists to improve properties through alloying. The principal objective of the proposed work is to examine phase relations, phase transformations, the resulting precipitate morphologies and their influence on mechanical properties of SiC-<span class="hlt">AlN-Al</span>{sub 2}OC ceramics. Formation of modulated structures have been documented in SiC-<span class="hlt">Al</span>N ceramics in our work. It has been shown that modulations occur along directions other than the (0001) direction and this results in the formation of a tweed type of a microstructure. In the <span class="hlt">AlN-Al</span>{sub 2}OC system, the occurrence of cellular precipitates as well as coherent, disc-shaped precipitates has been observed. During the past year, work has progressed in the following areas: (1) Phase separation in SiC-<span class="hlt">Al</span>N system: The effect of coherency strain energy on the precipitate morphology. (2) High temperature creep of SiC-<span class="hlt">Al</span>N ceramics containing modulated structures and SiC-<span class="hlt">Al</span>{sub 2}OC ceramics. (3) Fabrication and characterization of damage-resistant SiC-<span class="hlt">Al</span>N ceramics. Three manuscripts have been submitted for publication.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1056318','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1056318"><span id="translatedtitle">Radiation Hard <span class="hlt">Al</span>GaN Detectors and Imager</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p></p> <p>2012-05-01</p> <p>Radiation hardness of <span class="hlt">Al</span>GaN photodiodes was tested using a 65 MeV proton beam with a total proton fluence of 3x10{sup 12} protons/cm{sup 2}. <span class="hlt">Al</span>GaN Deep UV Photodiode have extremely high radiation hardness. These new devices have mission critical applications in high energy density physics (HEDP) and space explorations. These new devices satisfy radiation hardness requirements by NIF. NSTec is developing next generation <span class="hlt">Al</span>GaN optoelectronics and imagers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6545125','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6545125"><span id="translatedtitle">Preferred Mn spacings in <span class="hlt">Al</span>-Mn compounds</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zou, J.; Carlsson, A.E. )</p> <p>1993-06-14</p> <p>A model pair potential is calculated for Mn-Mn pairs in <span class="hlt">Al</span> using a Green's function method. The pair potential has a preferred spacing of 4.7 A. The energy resulting from these Mn-Mn interactions strongly favors the <span class="hlt">Al</span>[sub 6]Mn, [alpha]-<span class="hlt">Al</span>MnSi, and icosahedral quasicrystal structures relative to competing simple structures, providing a possible mechanism for stabilizing the complex structures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4148684','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4148684"><span id="translatedtitle">High breakdown voltage in <span class="hlt">Al</span>GaN/GaN HEMTs using <span class="hlt">AlGaN/GaN/Al</span>GaN quantum-well electron-blocking layers</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2014-01-01</p> <p>In this paper, we numerically study an enhancement of breakdown voltage in <span class="hlt">Al</span>GaN/GaN high-electron-mobility transistors (HEMTs) by using the <span class="hlt">AlGaN/GaN/Al</span>GaN quantum-well (QW) electron-blocking layer (EBL) structure. This concept is based on the superior confinement of two-dimensional electron gases (2-DEGs) provided by the QW EBL, resulting in a significant improvement of breakdown voltage and a remarkable suppression of spilling electrons. The electron mobility of 2-DEG is hence enhanced as well. The dependence of thickness and composition of QW EBL on the device breakdown is also evaluated and discussed. PMID:25206318</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19920015311','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19920015311"><span id="translatedtitle">The cyclic oxidation resistance at 1200 C of beta-Ni<span class="hlt">Al</span>, Fe<span class="hlt">Al</span>, and Co<span class="hlt">Al</span> alloys with selected third element additions</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Barrett, C. A.; Titran, R. H.</p> <p>1992-01-01</p> <p>The intermetallic compounds Beta-Ni<span class="hlt">Al</span>, Fe<span class="hlt">Al</span>, and Co<span class="hlt">Al</span> were tested in cyclic oxidation with selected third element alloy additions. Tests in static air for 200 1-hr cycles at 1200 C indicated by specific weight change/time data and x-ray diffraction analysis that the 5 at percent alloy additions did not significantly improve the oxidation resistance over the alumina forming baseline alloys without the additions. Many of the alloy additions were actually deleterious. Ta and Nb were the only alloy additions that actually altered the nature of the oxide(s) formed and still maintained the oxidation resistance of the protective alumina scale.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22413214','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22413214"><span id="translatedtitle">Spectra of surface plasmon polariton enhanced electroluminescence from electroformed <span class="hlt">Al-Al</span>{sub 2}O{sub 3}-Ag diodes</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hickmott, T. W.</p> <p>2015-03-07</p> <p>Narrow band-pass filters have been used to measure the spectral distribution of electroluminescent photons with energies between 1.8 eV and 3.0 eV from electroformed <span class="hlt">Al-Al</span>{sub 2}O{sub 3}-Ag diodes with anodic <span class="hlt">Al</span>{sub 2}O{sub 3} thicknesses between 12 nm and 18 nm. Electroforming of metal-insulator-metal (MIM) diodes is a non-destructive dielectric breakdown that results in a conducting channel in the insulator and changes the initial high resistance of the MIM diode to a low resistance state. It is a critical step in the development of resistive-switching memories that utilize MIM diodes as the active element. Electroforming of <span class="hlt">Al-Al</span>{sub 2}O{sub 3}-Ag diodes in vacuum results in voltage-controlled negative resistance (VCNR) in the current-voltage (I-V) characteristics. Electroluminescence (EL) and electron emission into vacuum (EM) develop simultaneously with the current increase that results in VCNR in the I-V characteristics. EL is due to recombination of electrons injected at the <span class="hlt">Al-Al</span>{sub 2}O{sub 3} interface with radiative defect centers in <span class="hlt">Al</span>{sub 2}O{sub 3}. Measurements of EL photons between 1.8 eV and 3.0 eV using a wide band-pass filter showed that EL intensity is exponentially dependent on <span class="hlt">Al</span>{sub 2}O{sub 3} thickness for <span class="hlt">Al-Al</span>{sub 2}O{sub 3}-Ag diodes between 12 nm and 20 nm thick. Enhanced El intensity in the thinnest diodes is attributed to an increase in the spontaneous emission rate of recombination centers due to high electromagnetic fields generated in <span class="hlt">Al</span>{sub 2}O{sub 3} when EL photons interact with electrons in Ag or <span class="hlt">Al</span> to form surface plasmon polaritons at the <span class="hlt">Al</span>{sub 2}O{sub 3}-Ag or <span class="hlt">Al</span>{sub 2}O{sub 3}-<span class="hlt">Al</span> interface. El intensity is a maximum at 2.0–2.2 eV for <span class="hlt">Al-Al</span>{sub 2}O{sub 3}-Ag diodes with <span class="hlt">Al</span>{sub 2}O{sub 3} thicknesses between 12 nm and 18 nm. EL in diodes with 12 nm or 14 nm of <span class="hlt">Al</span>{sub 2}O{sub 3} is enhanced by factors of 8–10 over EL from a diode with 18 nm of <span class="hlt">Al</span>{sub 2}O{sub 3}. The extent of EL enhancement in the thinnest diodes can vary significantly between samples. A narrow band of recombination centers was found in one <span class="hlt">Al-Al</span>{sub 2}O{sub 3}-Ag diode with 12 nm of <span class="hlt">Al</span>{sub 2}O{sub 3}; it had EL intensity 100 times greater at 2.15 eV than the diode with 18 nm of <span class="hlt">Al</span>{sub 2}O{sub 3}. EL intensity for photons with energies greater than 2.6 eV is nearly the same for all diodes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JAP...117i4303H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JAP...117i4303H"><span id="translatedtitle">Spectra of surface plasmon polariton enhanced electroluminescence from electroformed <span class="hlt">Al-Al</span>2O3-Ag diodes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hickmott, T. W.</p> <p>2015-03-01</p> <p>Narrow band-pass filters have been used to measure the spectral distribution of electroluminescent photons with energies between 1.8 eV and 3.0 eV from electroformed <span class="hlt">Al-Al</span>2O3-Ag diodes with anodic <span class="hlt">Al</span>2O3 thicknesses between 12 nm and 18 nm. Electroforming of metal-insulator-metal (MIM) diodes is a non-destructive dielectric breakdown that results in a conducting channel in the insulator and changes the initial high resistance of the MIM diode to a low resistance state. It is a critical step in the development of resistive-switching memories that utilize MIM diodes as the active element. Electroforming of <span class="hlt">Al-Al</span>2O3-Ag diodes in vacuum results in voltage-controlled negative resistance (VCNR) in the current-voltage (I-V) characteristics. Electroluminescence (EL) and electron emission into vacuum (EM) develop simultaneously with the current increase that results in VCNR in the I-V characteristics. EL is due to recombination of electrons injected at the <span class="hlt">Al-Al</span>2O3 interface with radiative defect centers in <span class="hlt">Al</span>2O3. Measurements of EL photons between 1.8 eV and 3.0 eV using a wide band-pass filter showed that EL intensity is exponentially dependent on <span class="hlt">Al</span>2O3 thickness for <span class="hlt">Al-Al</span>2O3-Ag diodes between 12 nm and 20 nm thick. Enhanced El intensity in the thinnest diodes is attributed to an increase in the spontaneous emission rate of recombination centers due to high electromagnetic fields generated in <span class="hlt">Al</span>2O3 when EL photons interact with electrons in Ag or <span class="hlt">Al</span> to form surface plasmon polaritons at the <span class="hlt">Al</span>2O3-Ag or <span class="hlt">Al</span>2O3-<span class="hlt">Al</span> interface. El intensity is a maximum at 2.0-2.2 eV for <span class="hlt">Al-Al</span>2O3-Ag diodes with <span class="hlt">Al</span>2O3 thicknesses between 12 nm and 18 nm. EL in diodes with 12 nm or 14 nm of <span class="hlt">Al</span>2O3 is enhanced by factors of 8-10 over EL from a diode with 18 nm of <span class="hlt">Al</span>2O3. The extent of EL enhancement in the thinnest diodes can vary significantly between samples. A narrow band of recombination centers was found in one <span class="hlt">Al-Al</span>2O3-Ag diode with 12 nm of <span class="hlt">Al</span>2O3; it had EL intensity 100 times greater at 2.15 eV than the diode with 18 nm of <span class="hlt">Al</span>2O3. EL intensity for photons with energies greater than 2.6 eV is nearly the same for all diodes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26344185','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26344185"><span id="translatedtitle">On the microscopic dynamics of the 'Einstein solids' <span class="hlt">Al</span>V2<span class="hlt">Al</span>20 and GaV2<span class="hlt">Al</span>20, and of YV2<span class="hlt">Al</span>20: a benchmark system for 'rattling' excitations.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Koza, Michael Marek; Mutka, Hannu; Okamoto, Yoshihiko; Yamaura, Jun-ichi; Hiroi, Zenji</p> <p>2015-10-14</p> <p>The inelastic response of AV2<span class="hlt">Al</span>20 (with A = <span class="hlt">Al</span>, Ga and Y) was probed by high-resolution inelastic neutron scattering experiments and density functional theory (DFT) based lattice dynamics calculations (LDC). Features characteristic of the dynamics of <span class="hlt">Al</span>, Ga and Y are established experimentally in the low-energy range of the compounds. In the stereotype 'Einstein-solid' compound <span class="hlt">Al</span>V2<span class="hlt">Al</span>20 we identify a unique spectral density extending up to 10 meV at 1.6 K. Its dominating feature is a peak centred at 2 meV at the base temperature. A very similar spectral distribution is established in GaV2<span class="hlt">Al</span>20 albeit the strong peak is located at 1 meV at 1.6 K. In YV2<span class="hlt">Al</span>20 signals characteristic of Y dynamics are located above 8 meV. The spectral distributions are reproduced by the DFT-based LDC and identified as a set of phonons. The response to temperature changes between 1.6 and ∼300 K is studied experimentally and the exceptionally vivid renormalization of the A characteristic modes in <span class="hlt">Al</span>V2<span class="hlt">Al</span>20 and GaV2<span class="hlt">Al</span>20 is quantified by following the energy of the strong peak. At about 300 K it is shifted to higher energies by 300% for A = <span class="hlt">Al</span> and 450% for A = Ga. The dynamics of A = Y in YV2<span class="hlt">Al</span>20 show a minor temperature effect. This holds in general for modes located above 10 meV in any of the compounds. They are associated with vibrations of the V2<span class="hlt">Al</span>20 matrix. Atomic potentials derived through DFT calculations indicate the propensity of A = <span class="hlt">Al</span> and Ga to a strong positive energy shift upon temperature increase by a high quartic component. The effect of the strong phonon renormalization on thermodynamic observables is computed on grounds of the LDC results. It is shown that through the hybridization of A = <span class="hlt">Al</span> and Ga with the V2<span class="hlt">Al</span>20 dynamics the matrix vibrations in the low-energy range follow this renormalization. PMID:26344185</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19870048075&hterms=Boron&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3DBoron','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19870048075&hterms=Boron&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3DBoron"><span id="translatedtitle">The role of boron in ductilizing Ni3<span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Vedula, K.; Shabel, B. S.; Khadkikar, P. S.</p> <p>1987-01-01</p> <p>Ductilization of Ni3<span class="hlt">Al</span> at room temperature by microalloying with boron has been primarily attributed to the increased grain boundary cohesion in the presence of boron. However, another aspect of the role played by boron in ductilizing Ni3<span class="hlt">Al</span> is revealed when the Hall-Petch relationships for Ni3<span class="hlt">Al</span> and B-doped Ni3<span class="hlt">Al</span> are compared. A shallower slope for the B-doped Ni3<span class="hlt">Al</span> compared to that for Ni3<span class="hlt">Al</span> indicates a reduced resistance to slip propagation across grain boundaries, and therefore reduced stress concentration at boundaries, in the presence of boron. This comparison of Hall-Petch relationships was carried out by generating data for powder processed B-doped Ni3<span class="hlt">Al</span> at various grain sizes and by compiling data for Ni3<span class="hlt">Al</span> from the literature. In addition, the room temperature fracture of B-doped Ni3<span class="hlt">Al</span> has been shown to initiate along certain grain boundaries. The fracture eventually occurs by transgranular ductile tearing.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JPhCS.663a2004G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JPhCS.663a2004G"><span id="translatedtitle">Structure determination of Fe-<span class="hlt">Al</span>-Ge alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gargicevich, D.; Galván Josa, V. M.; Blanco, C.; Lambri, A.; Cuello, G. J.</p> <p>2015-11-01</p> <p>We studied the crystalline structure of Fe - 8at.%<span class="hlt">Al</span> - 4at.%Ge alloy between 300 and 1300 K and its relation to the mechanical response by means of neutron diffraction and mechanical spectroscopy. At room temperature we observe a Fe3<span class="hlt">Al</span>-type ordered structure with a deficiency of <span class="hlt">Al</span> in the 8c sites. The Ge atoms are distributed in the 4a and <span class="hlt">Al</span> atoms in 8c sites. At high temperature we observe an order-disorder transformation when the crystal structure becomes Fe-α type. This loss of order gives rise to the hysteresis behavior of damping between the heating and cooling runs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26519574','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26519574"><span id="translatedtitle">Isotopically exchangeable <span class="hlt">Al</span> in coastal lowland acid sulfate soils.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Yvanes-Giuliani, Yliane A M; Fink, D; Rose, J; Waite, T David; Collins, Richard N</p> <p>2016-01-15</p> <p>Periodic discharges of high concentrations of aluminium (<span class="hlt">Al</span>) causing fish kills and other adverse effects occur worldwide in waterways affected by coastal lowland acid sulfate soils (CLASS). The exchangeability - a metal's ability to readily transfer between the soil solid- and solution-phases - of <span class="hlt">Al</span> in these soils is therefore of particular importance as it has implications for metal transport, plant availability and toxicity to living organisms. In the present study, the concentrations of isotopically exchangeable <span class="hlt">Al</span> (E values) were measured in 27 CLASS and compared with common salt extractions (i.e. KCl and CuCl2) used to estimate exchangeable soil pools of <span class="hlt">Al</span>. E values of <span class="hlt">Al</span> were high in the soils, ranging from 357 to 3040mg·kg(-1). Exchangeable concentrations estimated using 1M KCl were consistently lower than measured E values, although a reasonable correlation was obtained between the two values (E=1.68×<span class="hlt">Al</span>KCl, r(2)=0.66, n=25). The addition of a 0.2M CuCl2 extraction step improved the 1:1 agreement between extractable and isotopically exchangeable <span class="hlt">Al</span> concentrations, but lead to significant mobilisation of non-isotopically exchangeable <span class="hlt">Al</span> in surficial 'organic-rich' CLASS having E values<1000mg·kg(-1). It was concluded that currently used (i.e. 1M KCl) methodology severely underestimates exchangeable <span class="hlt">Al</span> and total actual acidity values in CLASS and should be corrected by a factor similar to the one determined here. PMID:26519574</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19790029805&hterms=partial+lead&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dpartial%2Blead','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19790029805&hterms=partial+lead&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dpartial%2Blead"><span id="translatedtitle"><span class="hlt">Al</span>-26 and the partial ionization of the solar nebula</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Consolmagno, G. J.; Jokipii, J. R.</p> <p>1978-01-01</p> <p>It is shown that an even distribution of the amount of <span class="hlt">Al</span>-26 equal to 10 to the minus tenth power of the amount of H (the amount of <span class="hlt">Al</span>-26 suggested by scaling from cosmic abundances) will lead to a small but significant partial ionization of the nebular gas. Calculation of the ionization state and consequent magnetic Reynolds number for the solar nebula shows that the presence of <span class="hlt">Al</span>-26 will result in strong coupling of the gas to magnetic fields. In the absence of <span class="hlt">Al</span>-26, K-40 will still result in substantial ionization, but the degree of magnetic coupling is much more model dependent.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1999PhyB..259..621J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1999PhyB..259..621J"><span id="translatedtitle">Tunneling into epitaxial UPd 2<span class="hlt">Al</span> 3 thin films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jourdan, M.; Huth, M.; Haibach, P.; Adrian, H.</p> <p>1999-01-01</p> <p>UPd 2<span class="hlt">Al</span> 3-<span class="hlt">Al</span>O x-Pb Giaever-type tunneling junctions were prepared employing an in vacuo process. The high junction quality is evident by the observation of the well-known superconducting density of states of the Pb counter electrode. For HPbc2< H≪ HUPd 2<span class="hlt">Al</span> 3c2 an energy gap for UPd 2<span class="hlt">Al</span> 3 along the c-axis is well-resolved. This represents the first direct observation of the superconducting density of states of a heavy-fermion-compound by spectroscopic means.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_23 --> <div id="page_24" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="461"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21428733','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21428733"><span id="translatedtitle">Diamond/<span class="hlt">Al</span>N Thin Films for Optical Applications</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Knoebber, F.; Bludau, O.; Williams, O. A.; Sah, R. E.; Kirste, L.; Baeumler, M.; Nebel, C. E.; Ambacher, O.; Cimalla, V.; Lebedev, V.; Leopold, S.; Paetz, D.</p> <p>2010-11-01</p> <p>In this work we report on membranes made of nanocrystalline diamond (NCD) and <span class="hlt">Al</span>N for the use in tunable micro-optics. For the growth of the <span class="hlt">Al</span>N and NCD thin films, magnetron sputtering and chemical vapor deposition techniques have been used, respectively. A chemical-mechanical polishing process of NCD layers has been introduced, which is crucial for the growth of c-oriented, fiber textured <span class="hlt">Al</span>N films. <span class="hlt">Al</span>N layers deposited on as grown and polished nanocrystalline diamond along with free standing membranes have been compared by studying microstructure, surface morphology, piezoelectrical response as well as optical properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/432985','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/432985"><span id="translatedtitle">Energetic-particle synthesis of nanocomposite <span class="hlt">Al</span> alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Follstaedt, D.M.; Knapp, J.A.; Barbour, J.C.; Myers, S.M.; Dugger, M.T.</p> <p>1996-11-26</p> <p>Ion implantation of O into <span class="hlt">Al</span> and growth of <span class="hlt">Al</span>(O) layers using electro-cyclotron resonance plasma and pulsed laser depositions produce composite alloys with a high density of nanometer-size oxide precipitates in an <span class="hlt">Al</span> matrix. The precipitates impart high strength to the alloy and reduced adhesion during sliding contact, while electrical conductivity and ductility are retained. Implantation of N into <span class="hlt">Al</span> produces similar microstructures and mechanical properties. The athermal energies of deposited atoms are a key factor in achieving these properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JNuM..466..576K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JNuM..466..576K"><span id="translatedtitle">Thermal conductivity modeling of U-Mo/<span class="hlt">Al</span> dispersion fuel</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kim, Yeon Soo; Cho, Byoung Jin; Sohn, Dong-Seong; Park, Jong Man</p> <p>2015-11-01</p> <p>A dataset for the thermal conductivity of U-Mo/<span class="hlt">Al</span> dispersion fuel made available by KAERI was reanalyzed. Using this dataset, an analytical model was obtained by expanding the Bruggeman model. The newly developed model incorporates thermal resistances at the interface between the U-Mo particles and the <span class="hlt">Al</span> matrix and the defects within the <span class="hlt">Al</span> matrix (grain boundaries, cracks, and dislocations). The interfacial resistances are expressed as functions of U-Mo particle size and <span class="hlt">Al</span> grain size obtained empirically by fitting to measured data from KAERI. The model was then validated against an independently measured dataset from ANL.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AIPC.1536..591T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AIPC.1536..591T"><span id="translatedtitle">Electrical resistivity of <span class="hlt">Al</span>-Cu liquid binary alloy</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Thakor, P. P.; Patel, J. J.; Sonvane, Y. A.; Jani, A. R.</p> <p>2013-06-01</p> <p>Present paper deals with the electrical resistivity (?) of liquid <span class="hlt">Al</span>-Cu binary alloy. To describe electron-ion interaction we have used our parameter free model potential along with Faber-Ziman formulation combined with Ashcroft-Langreth (<span class="hlt">AL</span>) partial structure factor. To see the influence of exchange and correlation effect, Hartree, Taylor and Sarkar et <span class="hlt">al</span> local field correlation functions are used. From present results, it is seen that good agreements between present results and experimental data have been achieved. Lastly we conclude that our model potential successfully produces the data of electrical resistivity (?) of liquid <span class="hlt">Al</span>-Cu binary alloy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/12365834','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/12365834"><span id="translatedtitle">Enhanced dehalogenation of halogenated methanes by bimetallic Cu/<span class="hlt">Al</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Lien, Hsing-Lung; Zhang, Weixian</p> <p>2002-10-01</p> <p>A low-cost and high effective copper/aluminum (Cu/<span class="hlt">Al</span>) bimetal has been developed for treatments of halogenated methanes, including dichloromethane, in near neutral and high pH aqueous systems. Bimetallic Cu/<span class="hlt">Al</span> was prepared by a simple two-step synthetic method where Cu was deposited onto the <span class="hlt">Al</span> surface. The presence of Cu on <span class="hlt">Al</span> significantly enhanced rates of degradation of halogenated methanes and reduced toxic halogenated intermediates. The stability of Cu/<span class="hlt">Al</span> was preliminarily studied by a multi-spiking batch experiment where complete degradation of carbon tetrachloride was achieved for seven times although the Cu/<span class="hlt">Al</span> aging was found. Roles of Cu may involve protecting <span class="hlt">Al</span> against an undesirable oxidation with water, enhancing reaction rates through the galvanic corrosion, and increasing the selectivity to a benign compound (i.e., methane). Kinetic analyses indicated that the activity of bimetallic Cu/<span class="hlt">Al</span> was comparable to that of iron-based bimetals (e.g., palladized iron) and zero-valent metals. Bimetallic Cu/<span class="hlt">Al</span> could be a promising reactive reagent for remediation of halogenated solvents-contaminated groundwater associated with high pH problems. PMID:12365834</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1054995','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1054995"><span id="translatedtitle">Interdiffusion and Intrinsic Diffusion in the Mg-<span class="hlt">Al</span> System</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Brennan, Sarah; Bermudez, Katrina; Sohn, Yong Ho; Kulkarni, Nagraj S</p> <p>2012-01-01</p> <p>Solid-to-solid diffusion couples were assembled and annealed to examine the diffusion between pure Mg (99.96%) and <span class="hlt">Al</span> (99.999%). Diffusion anneals were carried out at 300 , 350 , and 400 C for 720, 360, and 240 hours, respectively. Optical and scanning electron microscopes were utilized to identify the formation of the intermetallic phases, -<span class="hlt">Al</span>12Mg17 and -<span class="hlt">Al</span>3Mg2 and absence of the -phase in the diffusion couples. Thicknesses of the -<span class="hlt">Al</span>12Mg17 and -<span class="hlt">Al</span>3Mg2 phases were measured and the parabolic growth constants were calculated to determine the activation energies for the growth, 165 and 86 KJ/mole, respectively. Concentration profiles were determined with electron microprobe analysis using pure elemental standards. Composition-dependent interdiffusion coefficients in Mg-solid solution, -<span class="hlt">Al</span>12Mg17 and - <span class="hlt">Al</span>3Mg2 and <span class="hlt">Al</span>-solid solutions were calculated based on the Boltzmann-Matano analysis. Average effective interdiffusion coefficients for each phase were also calculated, and the magnitude was the highest for the -<span class="hlt">Al</span>3Mg2 phase, followed by -<span class="hlt">Al</span>12Mg17, <span class="hlt">Al</span>-solid solution and Mg-solid solution. Intrinsic diffusion coefficients based on Huemann s analysis (e.g., marker plane) were determined for the ~38 at.% Mg in the -<span class="hlt">Al</span>3Mg2 phase. Activation energies and the pre-exponential factors for the inter- and intrinsic diffusion coefficients were calculated for the temperature range examined. The -<span class="hlt">Al</span>3Mg2 phase was found to have the lowest activation energies for growth and interdiffusion among all four phases studied. At the marker location in the -<span class="hlt">Al</span>3Mg2 phase, the intrinsic diffusion of <span class="hlt">Al</span> was found to be faster than that of Mg. Extrapolations of the impurity diffusion coefficients in the terminal solid solutions were made and compared to the available self- and impurity diffusion data from literature. Thermodynamic factor, tracer diffusion coefficients and atomic mobilities at the marker plane composition were approximated using available literature values of Mg activity in the -<span class="hlt">Al</span>3Mg2 phase.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/sciencecinema/biblio/988018','SCIGOVIMAGE-SCICINEMA'); return false;" href="http://www.osti.gov/sciencecinema/biblio/988018"><span id="translatedtitle"><span class="hlt">al</span>-Qaida Strategy, Ideology, Doctrine, and Media</span></a></p> <p><a target="_blank" href="http://www.osti.gov/sciencecinema/">ScienceCinema</a></p> <p>Dr. Jarret Brachman</p> <p>2010-09-01</p> <p>Dr. Jarret Brachman, an internationally recognized <span class="hlt">al</span>-Qaida specialist, author and public lecturer, shares his thoughts on a range of topics, including the differences involved in fighting insurgent groups versus terrorist organizations, the future of the global <span class="hlt">al</span>-Qaida movement, and assessing America's efforts to combat <span class="hlt">al</span>-Qaida. In his talk, Brachman focuses specifically on current trends in <span class="hlt">al</span>-Qaida's military and messaging strategies, both from the perspective of the group's senior leadership and its regional commands. Presented on June 17, 2010.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AIPC.1669b0042A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AIPC.1669b0042A"><span id="translatedtitle">Effect of calcination time on Ni<span class="hlt">Al-Al</span>2O3 using gel combustion synthesis method</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Afandi, N. F.; Manap, A.; Yusof, S. N. A.; Salim, M. A.; Azim, M. Al.; Othman, S. Z.; Pauzi, N. I. M.; Omar, Nooririnah; Misran, H.</p> <p>2015-07-01</p> <p>This study was conducted in order to investigate the effect of calcination time on phase and microstructural characteristics of intermetallic matric composite (IMC), Ni<span class="hlt">Al-Al</span>2O3 powder. This powder was synthesized using gel combustion method with octyl alcohol as fuel. Upon completion of the combustion process, the loose powder was calcined at 1050°C for 1, 2 and 4 hours and characterized using XRD, FESEM and TEM. The crystallite size was calculated to be in the range of 29-30 nm. It was found that Ni<span class="hlt">Al-Al</span>2O3 exhibits high crystalline structure after calcination for 4 hours. Furthermore, longer calcination time also cause growth of the particle size. Findings indicate that high crystalline nanostructured Ni<span class="hlt">Al-Al</span>2O3 powder consisting of submicron particles can be successfully produced using gel combustion synthesis with longer calcination time.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/10184679','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/10184679"><span id="translatedtitle">Processing and mechanical properties of laminar <span class="hlt">Al</span>{sub 2}O{sub 3}-Ni{sub 3}<span class="hlt">Al</span> composites</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Schneibel, J.H.; Alexander, K.B.</p> <p>1994-09-01</p> <p>Several compositions of the intermetallic alloy Ni{sub 3}<span class="hlt">Al</span> were examined with respect to (a) their wetting of <span class="hlt">Al</span>{sub 2}O{sub 3} and (b) their energy absorption capability in <span class="hlt">Al</span>{sub 2}O{sub 3}/Ni{sub 3}<span class="hlt">Al</span> laminates. Wetting is enhanced by small additions of carbon (e.g., 0.1 at. %), and bonding by additions of zirconium (e.g., 1 at. %). Chevron-notched laminate specimens were tested in three-point bending to assess the energy absorption due to the presence of a thin layer of Ni{sub 3}<span class="hlt">Al</span>. A nickel aluminide with the composition of Ni-22<span class="hlt">Al</span>-1Zr-0.1C-0.1B was found to have a reasonable combination of wetting, adhesion and energy absorption. Interfacial bonding was found to be weak in all laminates.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008AcSpA..70..154D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008AcSpA..70..154D"><span id="translatedtitle">Synthesis and spectral investigation of <span class="hlt">Al</span>(III) catechin/?-cyclodextrin and <span class="hlt">Al</span>(III) quercetin/?-cyclodextrin inclusion compounds</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Dias, Karina; Nikolaou, Sofia; De Giovani, Wagner F.</p> <p>2008-06-01</p> <p><span class="hlt">Al</span>-catechin/?-cyclodextrin and <span class="hlt">Al</span>-quercetin/?-cyclodextrin (?-CD) inclusion compounds were synthesized and characterized by IR, UV-vis, 1H and 13C NMR and TG and DTA analyses. Because quercetin is sparingly soluble in water, the stability constants of the <span class="hlt">Al</span>-quercetin/?-CD and <span class="hlt">Al</span>-catechin/?-CD compounds were determined by phase solubility studies. The A L-type diagrams indicated the formation of 1:1 inclusion compounds and allowed calculation of the stability constants. The thermodynamic parameters were obtained from the dependence of the stability constants on temperature and results indicated that the formation of the inclusion compounds is an enthalpically driven process. The thermal decomposition of the solid <span class="hlt">Al</span>-quercetin/?-CD and <span class="hlt">Al</span>-catechin/?-CD inclusion compounds took place at different stages, compared with the respective precursors, proving that an inclusion complexation process really occurred.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22340378','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22340378"><span id="translatedtitle">Microstructure evolution during annealing of Ti<span class="hlt">Al/NiCoCrAl</span> multilayer composite prepared by EB-PVD</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zhang, Rubing; Zhang, Deming; Chen, Guiqing; Wang, Yuesheng</p> <p>2014-07-01</p> <p>Ti<span class="hlt">Al/NiCoCrAl</span> laminate composite sheet with a thickness of 0.4–0.6 mm as well as a dimension of 150 mm × 100 mm was fabricated successfully by using electron beam physical vapor deposition (EB-PVD) method. The annealing treatment was processed at 1123 and 1323 K for 3 h in a high vacuum atmosphere, respectively. The phase composition and microstructure of Ti<span class="hlt">Al/NiCoCrAl</span> microlaminated sheet have been analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Based on the sheet characterization and results of the microstructure evolution during annealing treatment process, the diffusion mechanism of interfacial reaction in Ti<span class="hlt">Al/NiCoCrAl</span> microlaminate was investigated and discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JTST...24.1071W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JTST...24.1071W"><span id="translatedtitle">Microstructure Evolution of Cold-Sprayed <span class="hlt">Al</span>-Si Alloy Coatings on ?-Ti<span class="hlt">Al</span> During Heat Treatment</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, Jiqiang; Kong, Lingyan; Li, Tiefan; Xiong, Tianying</p> <p>2015-08-01</p> <p>This paper investigated the influence of heat treatment on the microstructure of <span class="hlt">Al</span>-Si alloy coatings on ?-Ti<span class="hlt">Al</span> alloy. The coatings were prepared by cold spraying with <span class="hlt">Al</span>-12Si and <span class="hlt">Al</span>-20Si alloy powders as the feedstock, and then the as-sprayed coatings were subjected to heat treatment. The microstructure, chemical composition, and phase transformation of the coatings were studied by SEM, XRD, and EPMA. The diffusing behavior of <span class="hlt">Al</span> and Si during heat treatment was investigated. The results showed that a silicon-aluminizing coating was formed through the inward diffusion of <span class="hlt">Al</span>/Si elements into the substrate. The obtained kinetics curve of the formation of silicon-aluminizing coating at 580 °C similarly followed parabolic law.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014NIMPB.326...90I','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014NIMPB.326...90I"><span id="translatedtitle">Thermoluminescence study of <span class="hlt">Al</span>2O3 and Y3<span class="hlt">Al</span>5O12 single crystals irradiated with reactor neutrons</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Izerrouken, M.; Meftah, A.; Berkani, S.</p> <p>2014-05-01</p> <p><span class="hlt">Al</span>2O3 and Y3<span class="hlt">Al</span>5O12 singles crystals were irradiated by reactor neutrons at about 40 °C. After irradiation the generated point defects were investigated by optical absorption, thermoluminescence (TL) and differential scanning calorimetry (DSC) techniques. From the experimental data, it is found that 300 nm absorption band observed in <span class="hlt">Al</span>2O3 and Y3<span class="hlt">Al</span>5O12 crystals is attributed to Ali+ ion and O- - hole center localized near the cation vacancy respectively. It acts as hole traps with activation energies of 1.4 and 1.3 eV, respectively. Different annealing steps are observed and discussed in both Y3<span class="hlt">Al</span>5O12 and <span class="hlt">Al</span>2O3 crystals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JPhCS.643a2085S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JPhCS.643a2085S"><span id="translatedtitle">Increasing of <span class="hlt">Al</span>GaAs/GaAs quantum well robustness to resonant excitation by lowering <span class="hlt">Al</span> concentration in barriers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Solovev, I. A.; Davydov, V. G.; Kapitonov, Yu V.; Shapochkin, P. Yu; Efimov, Yu P.; Lovcjus, V. A.; Eliseev, S. A.; Petrov, V. V.; Ovsyankin, V. V.</p> <p>2015-11-01</p> <p>The robustness of <span class="hlt">Al</span>GaAs/GaAs quantum well to strong resonant excitation is studied. It was found that lowering <span class="hlt">Al</span> concentration in barriers to 3% does not influence the measured radiative linewidth of exciton resonance in the sample at low intensities. At the same time parasitic broadening of the resonance by an additional resonant illumination is strongly suppressed as compared to the quantum well with 30% of <span class="hlt">Al</span> in barriers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JPhCS.214a2077C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JPhCS.214a2077C"><span id="translatedtitle">Thermal diffusivity of <span class="hlt">Al</span>-Mg based metallic matrix composite reinforced with <span class="hlt">Al</span>2O3 ceramic particles</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Cruz-Orea, A.; Morales, J. E.; Saavedra S, R.; Carrasco, C.</p> <p>2010-03-01</p> <p>Thermal diffusivities of <span class="hlt">Al</span>-Mg based metallic matrix composite reinforced with ceramic particles of <span class="hlt">Al</span>2O3 are reported in this article. The samples were produced by rheocasting and the studied operational condition in this case is the shear rate: 800, 1400 and 2000 rpm. Additionally, the <span class="hlt">Al</span>Mg base alloy was tested. Measurements of thermal diffusivity were performed at room temperature by using photoacoustic technique.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23764233','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23764233"><span id="translatedtitle">The removal of bisphenol A from aqueous solutions by MIL-53(<span class="hlt">Al</span>) and mesostructured MIL-53(<span class="hlt">Al</span>).</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zhou, Meimei; Wu, Yi-Nan; Qiao, Junlian; Zhang, Jing; McDonald, Amanda; Li, Guangtao; Li, Fengting</p> <p>2013-09-01</p> <p>In this work, metal-organic framework MIL-53(<span class="hlt">Al){Al</span>(OH)[O2C-C6H4-CO2]} and MIL-53(<span class="hlt">Al</span>)-F127{<span class="hlt">Al</span>(OH)[O2C-C6H4-CO2]} were synthesized and used as sorbents to remove bisphenol A (BPA) from aqueous system. The sorption kinetics data of BPA were found to be in agreement with the pseudo-second-order model. The equilibrium sorption amounts of BPA on MIL-53(<span class="hlt">Al</span>) and MIL-53(<span class="hlt">Al</span>)-F127 reached 329.2±16.5 and 472.7±23.6 mg g(-1), respectively, far more than that of commercial activated carbons (ranging from 129.6 to 263.1 mg g(-1)). Both MIL-53(<span class="hlt">Al</span>) and MIL-53(<span class="hlt">Al</span>)-F127 could remove BPA fast from aqueous solutions, and the required contact time to reach equilibrium was approximately 90 min for MIL-53(<span class="hlt">Al</span>) and 30 min for MIL-53(<span class="hlt">Al</span>)-F127, respectively. The optimum pH levels for the removal of BPA using MIL-53 (<span class="hlt">Al</span>) and MIL-53(<span class="hlt">Al</span>)-F127 were 4 and 6 separately. The optimum temperature for the sorption behavior of BPA on the two sorbents was 20 °C. The results performed show that the resulting products, as one kind of MOFs, can be regarded as a new class of sorbents for water treatment and could find great applications in the fields of environmental water pollution control and resources reuse. PMID:23764233</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012ApPhL.101z2102K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012ApPhL.101z2102K"><span id="translatedtitle">Effect of dislocations on electron mobility in <span class="hlt">Al</span>GaN/GaN and <span class="hlt">AlGaN/Al</span>N/GaN heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kaun, Stephen W.; Burke, Peter G.; Hoi Wong, Man; Kyle, Erin C. H.; Mishra, Umesh K.; Speck, James S.</p> <p>2012-12-01</p> <p>AlxGa1-xN/GaN (x = 0.06, 0.12, 0.24) and <span class="hlt">AlGaN/Al</span>N/GaN heterostructures were grown on 6 H-SiC, GaN-on-sapphire, and free-standing GaN, resulting in heterostructures with threading dislocation densities of ˜2 × 1010, ˜5 × 108, and ˜5 × 107 cm-2, respectively. All growths were performed under Ga-rich conditions by plasma-assisted molecular beam epitaxy. Dominant scattering mechanisms with variations in threading dislocation density and sheet concentration were indicated through temperature-dependent Hall measurements. The inclusion of an <span class="hlt">Al</span>N interlayer was also considered. Dislocation scattering contributed to reduced mobility in these heterostructures, especially when sheet concentration was low or when an <span class="hlt">Al</span>N interlayer was present.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/934727','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/934727"><span id="translatedtitle">The wetting behavior of Ni<span class="hlt">Al</span> and NiPt<span class="hlt">Al</span> on polycrystalline alumina</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Saiz, Eduardo; Gauffier, Antoine; Saiz, Eduardo; Tomsia, Antoni P.; Hou, Peggy Y.</p> <p>2007-07-01</p> <p>In order to understand the beneficial effect of Pt on the adherence of thermally grown alumina scales, sessile drop experiments were performed to study the wetting of poly-crystalline alumina by nickel-aluminum alloys with or without platinum addition where the amount of Pt ranged from 2.4 to 10 at.%. Subsequent interfacial structure was evaluated using atomic force microscopy. Platinum addition enhances the wettability of Ni<span class="hlt">Al</span> alloys on alumina, reduces the oxide/alloy interface energy and increases the interfacial mass transport rates.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4284125','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4284125"><span id="translatedtitle">Inhibiting drug efflux transporters improves efficacy of <span class="hlt">ALS</span> therapeutics</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Jablonski, Michael R; Markandaiah, Shashirekha S; Jacob, Dena; Meng, Ni J; Li, Ke; Gennaro, Victoria; Lepore, Angelo C; Trotti, Davide; Pasinelli, Piera</p> <p>2014-01-01</p> <p>Objective Research identified promising therapeutics in cell models of Amyotrophic Lateral Sclerosis (<span class="hlt">ALS</span>), but there is limited progress translating effective treatments to animal models and patients, and <span class="hlt">ALS</span> remains a disease with no effective treatment. One explanation stems from an acquired pharmacoresistance driven by the drug efflux transporters P-glycoprotein (P-gp) and breast cancer-resistant protein (BCRP), which we have shown are selectively upregulated at the blood-brain and spinal cord barrier (BBB/BSCB) in <span class="hlt">ALS</span> mice and patients. Pharmacoresistance is well appreciated in other brain diseases, but overlooked in <span class="hlt">ALS</span> despite many failures in clinical trials. Methods Here, we prove that a P-gp/BCRP-driven pharmacoresistance limits the bioavailability of <span class="hlt">ALS</span> therapeutics using riluzole, the only FDA-approved drug for <span class="hlt">ALS</span> and a substrate of P-gp and BCRP. <span class="hlt">ALS</span> mice (SOD1-G93A) were treated with riluzole and elacridar, to block P-gp and BCRP, and monitored for survival as well as behavioral and physiological parameters. Results We show that riluzole, which normally is not effective when given at onset of symptoms, is now effective in the <span class="hlt">ALS</span> mice when administered in combination with the P-gp/BCRP inhibitor elacridar. Chronic elacridar treatment increases riluzole Central nervous system (CNS) penetration, improves behavioral measures, including muscle function, slowing down disease progression, and significantly extending survival. Interpretation Our approach improves riluzole efficacy with treatment beginning at symptom onset. Riluzole will not provide a cure, but enhancing its efficacy postsymptoms by addressing pharmacoresistance demonstrates a proof-of-principle concept to consider when developing new <span class="hlt">ALS</span> therapeutic strategies. We highlight a novel improved therapeutic approach for <span class="hlt">ALS</span> and demonstrate that pharmacoresistance can no longer be ignored in <span class="hlt">ALS</span>. PMID:25574474</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2000eaa..bookE3409.','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2000eaa..bookE3409."><span id="translatedtitle"><span class="hlt">al</span>-Khwarizmi [<span class="hlt">al</span>-Khawarizmi; <span class="hlt">al</span>'Khwarizmi], Abu Abd-Allah [Abdullah; Ja'far] Mohammad [Muhammad] ibn Musa [Bin Musa] (c. 800-c. 850)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Murdin, P.</p> <p>2000-11-01</p> <p>Born at Khawarizm (Kheva), south of the Aral Sea, he flourished in Baghdad from 813 to 833. He was an astronomer and geographer but is best known as a mathematician. The word algebra was derived from his book <span class="hlt">Al</span>-Jabr wa-<span class="hlt">al</span>-Muqabilah. He brought into mathematics the use of zero and the rest of the Indian system of numerals (now known as `Arabic numerals'), and developed the decimal system. His nam...</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_24 --> <div id="page_25" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="481"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19970009935','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19970009935"><span id="translatedtitle">Oxidation Resistant Ti-<span class="hlt">Al</span>-Fe Diffusion Barrier for FeCr<span class="hlt">Al</span>Y Coatings on Titanium Aluminides</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Brady, Michael P. (Inventor); Smialke, James L. (Inventor); Brindley, William J. (Inventor)</p> <p>1996-01-01</p> <p>A diffusion barrier to help protect titanium aluminide alloys, including the coated alloys of the Ti<span class="hlt">Al</span> gamma + Ti3<span class="hlt">Al</span> (alpha2) class, from oxidative attack and interstitial embrittlement at temperatures up to at least 1000 C is disclosed. The coating may comprise FeCr<span class="hlt">Al</span>X alloys. The diffusion barrier comprises titanium, aluminum, and iron in the following approximate atomic percent: Ti-(50-55)<span class="hlt">Al</span>-(9-20)Fe. This alloy is also suitable as an oxidative or structural coating for such substrates.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22288689','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22288689"><span id="translatedtitle">Precipitation in cold-rolled <span class="hlt">Al</span>–Sc–Zr and <span class="hlt">Al</span>–Mn–Sc–Zr alloys prepared by powder metallurgy</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Vlach, M.; Stulikova, I.; Smola, B.; Kekule, T.; Kudrnova, H.; Danis, S.; Gemma, R.; Ocenasek, V.; Malek, J.; Tanprayoon, D.; Neubert, V.</p> <p>2013-12-15</p> <p>The effects of cold-rolling on thermal, mechanical and electrical properties, microstructure and recrystallization behaviour of the <span class="hlt">Al</span>ScZr and <span class="hlt">Al</span>MnScZr alloys prepared by powder metallurgy were studied. The powder was produced by atomising in argon with 1% oxygen and then consolidated by hot extrusion at 350 °C. The electrical resistometry and microhardness together with differential scanning calorimetry measurements were compared with microstructure development observed by transmission and scanning electron microscopy, X-ray diffraction and electron backscatter diffraction. Fine (sub)grain structure developed and fine coherent <span class="hlt">Al</span>{sub 3}Sc and/or <span class="hlt">Al</span>{sub 3}(Sc,Zr) particles precipitated during extrusion at 350 °C in the alloys studied. Additional precipitation of the <span class="hlt">Al</span>{sub 3}Sc and/or <span class="hlt">Al</span>{sub 3}(Sc,Zr) particles and/or their coarsening was slightly facilitated by the previous cold rolling. The presence of Sc,Zr-containing particles has a significant antirecrystallization effect that prevents recrystallization at temperatures minimally up to 420 °C. The precipitation of the <span class="hlt">Al</span>{sub 6}Mn- and/or <span class="hlt">Al</span>{sub 6}(Mn,Fe) particles of a size ? 1.0 ?m at subgrain boundaries has also an essential antirecrystallization effect and totally suppresses recrystallization during 32 h long annealing at 550 °C. The texture development of the alloys seems to be affected by high solid solution strengthening by Mn. The precipitation of the Mn-containing alloy is highly enhanced by a cold rolling. The apparent activation energy of the <span class="hlt">Al</span>{sub 3}Sc particles formation and/or coarsening and that of the <span class="hlt">Al</span>{sub 6}Mn and/or <span class="hlt">Al</span>{sub 6}(Mn,Fe) particle precipitation in the powder and in the compacted alloys were determined. The cold deformation has no effect on the apparent activation energy values of the <span class="hlt">Al</span>{sub 3}Sc-phase and the <span class="hlt">Al</span>{sub 6}Mn-phase precipitation. - Highlights: • The Mn, Sc and Zr additions to <span class="hlt">Al</span> totally suppresses recrystallization at 550 °C. • The Sc,Zr-containing particle precipitation is slightly facilitated by cold rolling. • The Mn-containing particle precipitation is highly enhanced by cold rolling. • Cold rolling has no effect on activation energy of the <span class="hlt">Al</span>{sub 3}Sc and <span class="hlt">Al</span>{sub 6}Mn precipitation. • The texture development is affected by high solid solution strengthening by Mn.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MMTA...46.3342B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MMTA...46.3342B"><span id="translatedtitle">Characterization of Dendritic Microstructure, Intermetallic Phases, and Hardness of Directionally Solidified <span class="hlt">Al</span>-Mg and <span class="hlt">Al</span>-Mg-Si Alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Brito, Crystopher; Costa, Thiago A.; Vida, Talita A.; Bertelli, Felipe; Cheung, Noé; Spinelli, José Eduardo; Garcia, Amauri</p> <p>2015-08-01</p> <p>Despite the widespread application of <span class="hlt">Al</span>-Mg-Si alloys, especially in the automotive industry, interrelations of solidification thermal parameters (cooling rate and growth rate), microstructure, and hardness are not properly established. For instance, the control of the scale of the microstructure on both <span class="hlt">Al</span>-Mg and <span class="hlt">Al</span>-Mg-Si alloys by adequate pre-programming of the solidification thermal parameters remains a task to be accomplished. In the present study, the directional solidification (DS) of these alloys under unsteady-state solidification conditions is investigated in an attempt to characterize the evolution of microstructural features, macrosegregation, and hardness as a function of local solidification thermal parameters along the DS castings length. Silicon addition to the <span class="hlt">Al</span>-Mg alloy was found not to affect the sizes of primary and secondary dendrite arm spacings, but induced the onset of tertiary dendritic branches and affected also the size and distribution of intermetallic particles within the interdendritic regions. The <span class="hlt">Al</span>-Mg-Si alloy is characterized by a more complex arrangement of phases, including binary ( ?-<span class="hlt">Al</span> + Mg2Si) and refined ternary ( ?-<span class="hlt">Al</span> + Mg2Si + <span class="hlt">Al</span>Fe(Si) eutectic mixtures. As a consequence, a higher Vickers hardness profile is shown to be associated with the ternary <span class="hlt">Al</span>-Mg-Si alloy DS casting. For both alloys examined, hardness is shown to increase with the increase in the microstructural spacing according to Hall-Petch type equations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015TePhL..41..922K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015TePhL..41..922K"><span id="translatedtitle">Experimental determination of the top of the valence band in amorphous <span class="hlt">Al</span>2O3 and ?-<span class="hlt">Al</span>2O3</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Konyushenko, M. A.; Filatova, E. O.; Konashuk, A. S.; Nelyubov, A. V.; Shulakov, A. S.</p> <p>2015-10-01</p> <p>Abstract—Investigation of the energy distribution of occupied states in the valence band and determination of its upper level in films of amorphous <span class="hlt">Al</span>2O3 and ?-<span class="hlt">Al</span>2O3, synthesized by atomic layer deposition on a silicon substrate, was performed by X-ray photoelectron spectroscopy. The top of the valence gap in ?-<span class="hlt">Al</span>2O3 was found to shift by 0.8 eV towards larger electron binding energies with respect to amorphous <span class="hlt">Al</span>2O3.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007MMTA...38.2796S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007MMTA...38.2796S"><span id="translatedtitle">Nucleation Effects in Thermally Managed Graphite Fiber-Reinforced <span class="hlt">Al</span>-Cu and <span class="hlt">Al</span>-Si Composites</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Seong, H. G.; Lopez, H. F.; Gajdardziska-Josifovska, M.; Rohatgi, P. K.</p> <p>2007-11-01</p> <p>The influence of heat extraction through fiber reinforcements on the resultant solidification morphologies was investigated in cast <span class="hlt">Al</span>-Cu and <span class="hlt">Al</span>-Si alloy composites reinforced with graphite fibers (GRFs). For this purpose, the GRFs were externally cooled by exposing their ends to ambient air during pressure infiltration. It was found that in the <span class="hlt">Al</span>-Cu system, heat extraction through the fiber ends promoted the development of single ?-<span class="hlt">Al</span> envelopes around the GRFs. In particular, radial growth of the ? envelopes occurred with a planar solid/liquid solidification front as a result of heat extraction. Apparently, the high thermal conductivity of GRFs causes significant heat extraction to enable the development of a positive temperature gradient at the GRF/melt interface. High-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAD) unveiled the occurrence of (002) ?-<span class="hlt">Al</span>//(0002)GR orientation relationship at ?-<span class="hlt">Al</span>/GRF interfaces. Preferential nucleation of primary Si along the graphite surfaces of the GRF-reinforced <span class="hlt">Al</span>-Si alloy composite was also promoted by external fiber heat extraction. However, in this case, numerous nucleation events along the fiber interfaces were common, as well as nucleation at active substrates within the constrained melt. Finally, differential thermal analysis (DTA) indicated that the onset temperatures for nucleation shift toward higher values (by 7 °C for the <span class="hlt">Al</span>-Cu composite and 2 °C for the <span class="hlt">Al</span>-Si composite) when compared with their corresponding matrix alloys.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013NRL.....8..392C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013NRL.....8..392C"><span id="translatedtitle">Laser irradiation of ZnO:<span class="hlt">Al/Ag/ZnO:Al</span> multilayers for electrical isolation in thin film photovoltaics</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Crupi, Isodiana; Boscarino, Stefano; Torrisi, Giacomo; Scapellato, Giorgia; Mirabella, Salvatore; Piccitto, Giovanni; Simone, Francesca; Terrasi, Antonio</p> <p>2013-09-01</p> <p>Laser irradiation of ZnO:<span class="hlt">Al/Ag/ZnO:Al</span> transparent contacts is investigated for segmentation purposes. The quality of the irradiated areas has been experimentally evaluated by separation resistance measurements, and the results are complemented with a thermal model used for numerical simulations of the laser process. The presence of the Ag interlayer plays two key effects on the laser scribing process by increasing the maximum temperature reached in the structure and accelerating the cool down process. These evidences can promote the use of ultra-thin ZnO:<span class="hlt">Al/Ag/ZnO:Al</span> electrode in large-area products, such as for solar modules.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3849428','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3849428"><span id="translatedtitle">Laser irradiation of ZnO:<span class="hlt">Al/Ag/ZnO:Al</span> multilayers for electrical isolation in thin film photovoltaics</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2013-01-01</p> <p>Laser irradiation of ZnO:<span class="hlt">Al/Ag/ZnO:Al</span> transparent contacts is investigated for segmentation purposes. The quality of the irradiated areas has been experimentally evaluated by separation resistance measurements, and the results are complemented with a thermal model used for numerical simulations of the laser process. The presence of the Ag interlayer plays two key effects on the laser scribing process by increasing the maximum temperature reached in the structure and accelerating the cool down process. These evidences can promote the use of ultra-thin ZnO:<span class="hlt">Al/Ag/ZnO:Al</span> electrode in large-area products, such as for solar modules. PMID:24053228</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19920072523&hterms=cladding&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dcladding','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19920072523&hterms=cladding&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dcladding"><span id="translatedtitle">Nonequilibrium synthesis of Nb<span class="hlt">Al</span>3 and Nb-<span class="hlt">Al</span>-V alloys by laser cladding. II - Oxidation behavior</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Haasch, R. T.; Tewari, S. K.; Sircar, S.; Loxton, C. M.; Mazumder, J.</p> <p>1992-01-01</p> <p>Isothermal oxidation behaviors of Nb<span class="hlt">Al</span>3 alloy synthesized by laser cladding were investigated at temperatures between 800 and 1400 C, and the effect of vanadium microalloying on the oxidation of the laser-clad alloy was examined. The oxidation kinetics of the two alloys were monitored using thermal gravimetric weight gain data, and the bulk and surface chemistries were analyzed using XRD and XPS, respectively. It was found that Nb<span class="hlt">Al</span>3 did not form an exclusive layer of protective <span class="hlt">Al</span>2O3. The oxidation products at 800 C were found to be a mixture of Nb2O5 and <span class="hlt">Al</span>2O3. At 1200 C, a mixture of Nb<span class="hlt">Al</span>O4, Nb2O5, and <span class="hlt">Al</span>2O3 formed; and at 1400 C, a mixture of Nb<span class="hlt">Al</span>O4, <span class="hlt">Al</span>2O3, NbO2, NbO(2.432), and Nb2O5 formed. The addition of V led to a dramatic increase of the oxidation rate, which may be related to the formation of (Nb, V)2O5 and VO2, which grows in preference to protective <span class="hlt">Al</span>2O3.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://pubs.er.usgs.gov/publication/70155836','USGSPUBS'); return false;" href="http://pubs.er.usgs.gov/publication/70155836"><span id="translatedtitle">How well can wave runup be predicted? comment on Laudier et <span class="hlt">al</span>. (2011) and Stockdon et <span class="hlt">al</span>. (2006)</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Plant, Nathaniel G.; Stockdon, Hilary F.</p> <p>2015-01-01</p> <p>Laudier et <span class="hlt">al</span>. (2011) suggested that there may be a systematic bias error in runup predictions using a model developed by Stockdon et <span class="hlt">al</span>. (2006). Laudier et <span class="hlt">al</span>. tested cases that sampled beach and wave conditions that differed from those used to develop the Stockdon et <span class="hlt">al</span>. model. Based on our re-analysis, we found that in two of the three Laudier et <span class="hlt">al</span>. cases observed overtopping was actually consistent with the Stockdon et <span class="hlt">al</span>. predictions. In these cases, the revised predictions indicated substantial overtopping with, in one case, a freeboard deficit of 1 m. In the third case, the revised prediction had a low likelihood of overtopping, which reflected a large uncertainty due to wave conditions that included a broad and bi-modal frequency distribution. The discrepancy between Laudier et <span class="hlt">al</span>. results and our re-analysis appear to be due, in part, to simplifications made by Laudier et <span class="hlt">al</span>. when they implemented a reduced version of the Stockdon et <span class="hlt">al</span>. model.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22066146','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22066146"><span id="translatedtitle">Microstructural investigations on as-cast and annealed <span class="hlt">Al</span>-Sc and <span class="hlt">Al</span>-Sc-Zr alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lohar, A.K.; Mondal, B.; Rafaja, D.; Klemm, V.; Panigrahi, S.C.</p> <p>2009-11-15</p> <p><span class="hlt">Al</span>-Sc and <span class="hlt">Al</span>-Sc-Zr alloys containing 0.05, 0.1 and 0.5 wt.% Sc and 0.15 wt.% Zr were investigated using optical microscopy, electron microscopy and X-ray diffraction. The phase composition of the alloys and the morphology of precipitates that developed during solidification in the sand casting process and subsequent thermal treatment of the samples were studied. XRD analysis shows that the weight percentage of the <span class="hlt">Al</span>{sub 3}Sc/<span class="hlt">Al</span>{sub 3}(Sc, Zr) precipitates was significantly below 1% in all alloys except for the virgin <span class="hlt">Al</span>0.5Sc0.15Zr alloy. In this alloy the precipitates were observed as primary dendritic particles. In the binary <span class="hlt">Al</span>-Sc alloys, ageing at 470 deg. C for 24 h produced precipitates associated with dislocation networks, whereas the precipitates in the annealed <span class="hlt">Al</span>-Sc-Zr alloys were free of interfacial dislocations except at the lowest content of Sc. Development of large incoherent precipitates during precipitation heat treatment reduced hardness of all the alloys studied. Growth of the <span class="hlt">Al</span>{sub 3}Sc/<span class="hlt">Al</span>{sub 3}(Sc, Zr) precipitates after heat treatment was less at low Sc content and in the presence of Zr. Increase in hardness was observed after heat treatment at 300 deg. C in all alloys. There is a small difference in hardness between binary and ternary alloys slow cooled after sand casting.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1166716','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1166716"><span id="translatedtitle">Ultrafast Bulk Diffusion of <span class="hlt">Al</span>Hxin High-Entropy Dehydrogenation Intermediates of Na<span class="hlt">Al</span>H4</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zhang, Feng; Wood, Brandon C; Wang, Yan; Wang, Cai-Zhuang; Ho, Kai-Ming; Chou, Mei-Yin</p> <p>2014-08-14</p> <p>Using first-principles molecular dynamics (FPMD) and total-energy calculations, we demonstrate low-barrier bulk diffusion of <span class="hlt">Al</span>-bearing species in γ-Na<span class="hlt">Al</span>H4, a recently proposed high-entropy polymorph of Na<span class="hlt">Al</span>H4. For charged <span class="hlt">Al</span>H4– and neutral <span class="hlt">Al</span>H3 vacancies, the computed barriers for diffusion are <0.1 eV, and we directly observe the predicted diffusive pathways in FPMD simulations at picosecond time scales. In contrast, such diffusion in the α phase is inaccessible to FPMD, consistent with much higher barriers. The transport behavior of γ-Na<span class="hlt">Al</span>H4, in addition to key dynamical and structural signatures, is consistent with experimental observations of high-mobility species, strongly supporting the idea that an intermediate transition from the α phase to a high-entropy polymorph facilitates the hydrogen-releasing decomposition of Na<span class="hlt">Al</span>H4. Our results provide an answer to longstanding questions regarding the responsible agent for the experimentally observed efficient <span class="hlt">Al</span> transport during dehydrogenation and suggest that mass transport and phase transformation kinetics are coupled. Implications for understanding the (de)hydrogenation of undoped and catalyzed Na<span class="hlt">Al</span>H4 are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010RuMet2010..707B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010RuMet2010..707B"><span id="translatedtitle">Electrical conductivity of NaF-<span class="hlt">Al</span>F3-CaF2-<span class="hlt">Al</span>2O3 melts</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bakin, K. B.; Simakova, O. N.; Polyakov, P. V.; Mikhalev, Yu. G.; Simakov, D. A.; Gusev, A. O.</p> <p>2010-08-01</p> <p>The electrical conductivity of NaF-<span class="hlt">Al</span>F3-<span class="hlt">Al</span>2O3 melts with a CaF2 concentration of 5 wt % is measured at a continuously varying cell constant when the molar cryolitic ratio CR = [NaF]/[<span class="hlt">Al</span>F3] changes from 1.2 to 2.0 [1, 2]. The experimental data are used to obtain a regression equation to describe the dependence of the electrical conductivity of the melts under study on CR, the alumina content, and temperature { χ] = f(CR, [<span class="hlt">Al</span>2O3], T)}.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22269333','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22269333"><span id="translatedtitle">Effect of <span class="hlt">Al</span>-mole fraction in <span class="hlt">Al</span>{sub x}Ga{sub 1−x}N grown by MOCVD</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Jayasakthi, M. Ramesh, R. Prabakaran, K. Loganathan, R. Kuppulingam, B. Balaji, M. Arivazhagan, P. Sankaranarayanan, S. Singh, Shubra Baskar, K.</p> <p>2014-04-24</p> <p><span class="hlt">AlGaN/Al</span>N layers were grown by metalorganic chemical vapor deposition (MOCVD) on sapphire substrates. The <span class="hlt">Al</span>{sub x}Ga{sub 1−x}N layer composition was varied from 15% to 25%. The crystalline quality, thickness and aluminum (<span class="hlt">Al</span>) composition of <span class="hlt">Al</span>GaN were determined using high resolution X-ray diffraction (HRXRD). The growth rate decreases on increasing <span class="hlt">Al</span> composition. Reciprocal space mapping (RSM) was used to estimate the strain and relaxation between <span class="hlt">Al</span>GaN and <span class="hlt">Al</span>N. The optical properties of <span class="hlt">Al</span>GaN layers were investigated by room temperature Photoluminescence (PL). The <span class="hlt">Al</span>GaN peak shifts towards lower wavelength with <span class="hlt">Al</span> composition. The surface morphology of <span class="hlt">Al</span>GaN was studied by atomic force microscopy (AFM). Root mean square (RMS) roughness values were found to be increased in <span class="hlt">Al</span>GaN layers with composition.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JEMat.tmp..700J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JEMat.tmp..700J"><span id="translatedtitle">Impact of <span class="hlt">Al</span>N Spacer on Analog Performance of Lattice-Matched <span class="hlt">AlInN/Al</span>N/GaN MOSHEMT</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jena, Kanjalochan; Swain, Raghunandan; Lenka, T. R.</p> <p>2015-12-01</p> <p>In this work, a detailed investigation of the impact of spacer layer thickness on analog performance of an <span class="hlt">AlInN/Al</span>N/GaN metal oxide semiconductor high electron mobility transistor (MOSHEMT) is carried out. A thorough analysis of the key figure-of-merits such as threshold voltage (V th), two-dimensional electron gas sheet charge density (n s), drain current (I d), transconductance (g m), and gate leakage current are performed for various spacer thicknesses ranging from 0.5 nm to 1.8 nm. From the two-dimensional ATLAS device simulation results, it is observed that the performance of <span class="hlt">AlInN/Al</span>N/GaN MOSHEMT is affected by the variation of spacer thickness. Also, we have developed mathematical expressions for the evaluation of V th , n s , I d , g m and gate leakage current for the proposed device. The model results and technology computer-aided design simulation results are verified and also found to be satisfactory. Improved sheet charge density and superior analog performance is observed due to the insertion of the <span class="hlt">Al</span>N spacer. Suppression in the forward gate current is observed due to the insertion of the <span class="hlt">Al</span>N spacer which made it possible to apply a high gate voltage in the transistor operation. From the fabrication point of view, it is also feasible to utilize the existing complementary metal-oxide-semiconductor process flows to fabricate the proposed device.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2012-10-05/pdf/2012-24702.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2012-10-05/pdf/2012-24702.pdf"><span id="translatedtitle">77 FR 61046 - The Amendment of the Designation of <span class="hlt">Al</span>-Qa'ida in the Arabian Peninsula, aka <span class="hlt">Al</span>-Qa'ida of Jihad...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2012-10-05</p> <p>... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF STATE The Amendment of the Designation of <span class="hlt">Al</span>-Qa'ida in the Arabian Peninsula, aka <span class="hlt">Al</span>-Qa'ida of Jihad Organization in the Arabian Peninsula, aka Tanzim Qa'idat <span class="hlt">al</span>-Jihad fi Jazirat <span class="hlt">al</span>-Arab, aka <span class="hlt">Al</span>- Qa'ida in Yemen, aka...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2012-10-05/pdf/2012-24710.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2012-10-05/pdf/2012-24710.pdf"><span id="translatedtitle">77 FR 61046 - The Review and Amendment of the Designation of <span class="hlt">Al</span>-Qa'ida in the Arabian Peninsula, aka <span class="hlt">Al</span>-Qa'ida...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2012-10-05</p> <p>... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF STATE The Review and Amendment of the Designation of <span class="hlt">Al</span>-Qa'ida in the Arabian Peninsula, aka <span class="hlt">Al</span>-Qa'ida of Jihad Organization in the Arabian Peninsula, aka Tanzim Qa'idat <span class="hlt">al</span>-Jihad fi Jazirat <span class="hlt">al</span>-Arab, aka <span class="hlt">Al</span>- Qa'ida in...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2010-12-09/pdf/2010-31001.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2010-12-09/pdf/2010-31001.pdf"><span id="translatedtitle">75 FR 76771 - In the Matter of the Designation of Fahd Mohammed Ahmed <span class="hlt">al</span>-Quso, also known as Fahd <span class="hlt">al</span>-Quso, also...</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR">Federal Register 2010, 2011, 2012, 2013, 2014</a></p> <p></p> <p>2010-12-09</p> <p>... Matter of the Designation of Fahd Mohammed Ahmed <span class="hlt">al</span>-Quso, also known as Fahd <span class="hlt">al</span>-Quso, also known as Abu...-Bara', also known as Abu Hathayfah <span class="hlt">al</span>-Adani, also known as Fahd Mohammed Ahmed <span class="hlt">al</span>-Awlaqi, also known as... January 23, 2003, I hereby determine that the individual known as Fahd Mohammed Ahmed <span class="hlt">al</span>-Quso, also...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012MMTA...43..303F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012MMTA...43..303F"><span id="translatedtitle"><span class="hlt">Al</span>-to-Cu Friction Stir Lap Welding</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Firouzdor, Vahid; Kou, Sindo</p> <p>2012-01-01</p> <p>Recently, friction stir welding (FSW) has been used frequently to join dissimilar metals, for instance, <span class="hlt">Al</span> to Mg, Cu, and steel. The formation of brittle intermetallic compounds often severely limits the strength and ductility of the resultant welds. In the present study, <span class="hlt">Al</span>-to-Cu lap FSW was studied by welding 6061 <span class="hlt">Al</span> to commercially pure Cu. Conventional lap FSW was modified by butt welding a small piece of <span class="hlt">Al</span> to the top of Cu, with a slight pin penetration into the bottom of <span class="hlt">Al</span>. At travel speeds up to 127 mm/min (5 ipm), the modified welds were about twice the joint strength and five to nine times the ductility of the conventional lap welds. In the conventional lap welds, voids were present along the <span class="hlt">Al</span>-Cu interface, and fracture occurred along the interface in tensile testing. No such voids were observed in the modified lap welds, and fracture occurred through Cu. Thus, as in the case of <span class="hlt">Al</span>-to-Mg lap FSW recently studied by the authors, modified lap FSW significantly improved the weld quality in <span class="hlt">Al</span>-to-Cu lap FSW. At the relatively high travel speed of 203 mm/min (8 ipm), however, modified lap FSW was no longer superior because of channel formation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19890004926','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19890004926"><span id="translatedtitle">Oxidation behavior of Fe<span class="hlt">Al</span>+Hf,Zr,B</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Smialek, James L.; Doychak, Joseph</p> <p>1988-01-01</p> <p>The oxidation behavior of Fe-40<span class="hlt">Al</span>-1Hf, Fe-40<span class="hlt">Al</span>-1Hf-0.4B, and Fe-40<span class="hlt">Al</span>-0.1Zr-0.4B (at. percent) alloys was characterized after 900, 1000, and 100 C exposures. Isothermal tests revealed parabolic kinetics after a period of transitional theta-alumina scale growth. The parabolic growth rates for the subsequent alpha-alumina scales were about five times higher than those for Ni<span class="hlt">Al</span>+0.1Zr alloys. The isothermally grown scales showed a propensity toward massive scale spallation due to both extensive rumpling from growth stresses and to an inner layer of HfO2. Cyclic oxidation for 200 1-hr cycles produced little degradation at 900 or 1000 C, but caused significant spallation at 1100 C in the form of small segments of the outer scale. The major difference in the cyclic oxidation of the three Fe<span class="hlt">Al</span> alloys was increased initial spallation for Fe<span class="hlt">Al</span>+Zr,B. Although these Fe<span class="hlt">Al</span> alloys showed many similarities to Ni<span class="hlt">Al</span> alloys, they were generally less oxidation resistant. It is believed that this resulted from nonoptimal levels of dopants and larger thermal expansion mismatch stresses.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=kees&pg=4&id=EJ972102','ERIC'); return false;" href="http://eric.ed.gov/?q=kees&pg=4&id=EJ972102"><span id="translatedtitle">Assessing the Incremental Algorithm: A Response to Krahmer et <span class="hlt">al</span>.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>van Deemter, Kees; Gatt, Albert; van der Sluis, Ielka; Power, Richard</p> <p>2012-01-01</p> <p>This response discusses the experiment reported in Krahmer et <span class="hlt">al.'s</span> Letter to the Editor of "Cognitive Science". We observe that their results do not tell us whether the Incremental Algorithm is better or worse than its competitors, and we speculate about implications for reference in complex domains, and for learning from "normal" (i.e.,…</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_25 --> <center> <div class="footer-extlink text-muted"><small>Some links on this page may take you to non-federal websites. 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