Science.gov

Sample records for aplicados al analisis

  1. On random walk de Lvy aplicado aos mapas de varincias

    NASA Astrophysics Data System (ADS)

    Klafke, J. C.

    2003-08-01

    Uma pergunta que surge ao nos confrontarmos com os mapas de varincias, ou s-Maps [Klafke, J. C. "Estudo da Difuso Catica em Ressonncias Asteroidais", Tese de Doutorado, IAG/USP, 2002] diz respeito ao contedo fsico de tais representaes do espao de fase. Ou seja, o que representa as varincias das aes obtidas para uma determinada condio inicial e como relacion-las com o tempo de difuso das rbitas, supondo-se que estas de fato estejam envolvidas em um processo difusivo? Para discutirmos essa questo, lanamos mo da modelagem dos processos estocsticos subjacentes s varincias determinadas e implementamos uma srie de simulaes do tipo Monte Carlo a partir das informaes registradas nos s-Maps calculados para algumas ressonncias asteroidais bem estudadas (p.ex. 3: 1, 2: 1 e 3: 2). Para tanto, temos usado uma funo de densidade de probabilidade gaussiana ao definir os n passos que permitiro estabelecer uma relao direta entre o Mapa de Difuso e o Mapa de Varincias. Contudo, os resultados obtidos at agora tem subestimado o tempo de difuso esperado para os fenmenos conhecidos. Tal se deve ao fato de que, no processo difusivo real, possvel existirem passos de comprimento consideravelmente maiores que a mdia estabelecida pelas distribuies gaussiana ou normal, sobretudo quando se cruza uma regio catica. Neste trabalho, apresentamos os resultados comparativos de simulaes de Monte Carlo com base no random walk de Lvy [Klafter, J. et al. 2002. "Beyond Brownian motion", Phys. Today, Feb, 33-39.], o qual possibilita passos espordicos de comprimento acima do valor mdio (saltos) permitindo estabelecer uma escala de tempo mais prxima da esperada para a difuso.

  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. ALS Association

    MedlinePlus

    ... toward a world without ALS! Walk to Defeat ALS® Walk to Defeat ALS® draws people of all ... We need your help. I Will Advocate National ALS Registry The National ALS Registry is a congressionally ...

  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. Diagnosing ALS

    MedlinePlus

    ... Street NW - Suite 250 - Washington, DC 20005 All content and works posted on this website are owned and copyrighted by The ALS Association. ©2015 Lou Gehrig® used with permission of the Rip Van Winkle Foundation / www.LouGehrig.com nonprofit software

  6. 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 μm 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.

  7. [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

  8. Initial Symptoms of ALS

    MedlinePlus

    ... Chapters Certified Centers and Clinics Support Groups About ALS About Us Our Research In Your Community Advocate ... Diagnosis En español Symptoms The initial symptoms of ALS can be quite varied in different people. One ...

  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. Al-Anon/Alateen

    MedlinePlus

    Find an Al-Anon meeting Español | Français 2018 Int'l Convention Home About Group Meetings What If I'm not ready ... a meeting? What can I expect at an Al-Anon meeting? What was my first meeting like? ...

  11. 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

  12. [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

  13. 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.

  14. 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

  15. Genetic Testing for ALS

    MedlinePlus

    ... called predictive testing. Some medical centers may require psychological assessment and counseling before predictive testing. If a person in the family with ALS has a negative genetic test result (no identified genetic mutation), testing family members ...

  16. 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 ...

  17. What Is ALS?

    MedlinePlus

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

  18. 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.

  19. 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.

  20. 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.

  1. Rapidly solidified NiAl and FeAl

    NASA Technical Reports Server (NTRS)

    Gaydosh, D. J.; Crimp, M. A.

    1984-01-01

    Melt spinning was used to produce rapidly solidified ribbons of the B2 intermetallics NiAl and FeAl. Both Fe-40Al and Fe-45Al possessed some bend ductility in the as spun condition. The bend ductility of Fe-40Al, Fe-45Al, and equiatomic NiAl increased with subsequent heat treatment. Heat treatment at approximately 0.85 T (sub m) resulted in significant grain growth in equiatomic FeAl and in all the NiAl compositions. Low bend ductility in both FeAl and NiAl generally coincided with intergranular failure, while increased bend ductility was characterized by increasing amounts of transgranular cleavage fracture.

  2. 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.

  3. 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

  4. 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…

  5. 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.

  6. Frequently Asked Questions about ALS and the ALS Registry

    MedlinePlus

    ... Why is it necessary to provide my Social Security Number (SSN) when registering in the National ALS ... Why is it necessary to provide my Social Security Number (SSN) when registering in the National ALS ...

  7. Optical gain characteristics in Al-rich AlGaN/AlN quantum wells

    SciTech Connect

    Oto, Takao; Banal, Ryan G.; Funato, Mitsuru; Kawakami, Yoichi

    2014-05-05

    The optical gain characteristics of Al-rich AlGaN/AlN quantum wells (QWs) were assessed by the variable stripe length method at room temperature. An Al{sub 0.79}Ga{sub 0.21}N/AlN QW with a well width of 5 nm had a large optical gain of 140 cm{sup −1}. Increasing the excitation length induced a redshift due to the gain consumption and the consequent saturation of the amplified spontaneous emission. Moreover, a change in the dominant gain polarization with Al composition, which was attributed to switching of the valence band ordering of strained AlGaN/AlN QWs at Al compositions of ∼0.8, was experimentally demonstrated.

  8. 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.

  9. 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(+).

  10. 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.; Ōnuki, Y.; Harima, H.

    2015-03-01

    EuAl4 orders antiferromagnetically at TN ≈ 16 K with an effective magnetic moment of 8.02 μB. In the paramagnetic phase, the magnetic susceptibility of EuAl4 follows the Curie-Weiss law with a positive Curie-Weiss temperature θP = +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 νQ 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 θP = +14 K, which is consistent with that of the magnetic susceptibility. From the K - χ plot, the values of the hyperfine fields Hhf_iso and Hhf_aniso are -3.231 and -0.162 kOe/μB for Al(I) site, and -1.823 and -0.264 kOe/μB for Al(II) site, respectively. The values of νQ 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.

  11. Studies of 27Al NMR in SrAl4

    NASA Astrophysics Data System (ADS)

    Niki, Haruo; Higa, Nonoka; Kuroshima, Hiroko; Toji, Tatsuki; Morishima, Mach; Minei, Motofumi; Yogi, Mamoru; Nakamura, Ai; Hedo, Masato; Nakama, Takao; Ōnuki, Yoshichika; Harima, Hisatomo

    A charge density wave (CDW) transition at TCDW = 243 K and a structural phase (SP) transition at approximately 100 K occur in SrAl4 with the BaAl4-type body center tetragonal structure, which is the divalent and non-4f electron reference compound of EuAl4. To understand the behaviors of the CDW and SP transitions, the 27Al NMR measurements using a single crystal and a powder sample of SrAl4 have been carried out. The line width below TCDW is modulated by an electrical quadruple interaction between 27Al nucleus and CDW charge modulation. The incommensurate CDW state below TCDW changes into a different structure below TSP. The temperature dependences of Knight shifts of 27Al(I) and 27Al(II) show the different behaviors. The temperature variation of 27Al(I) Knight shift shows anomalies at the CDW and SP transition temperatures, revealing the shift to negative side below TCDW, which is attributable to the core polarization of the d-electrons. However, 27Al(II) Knight shift keeps almost constant except for the small shift due to the SP transition. The 1/T1T of 27Al(I) indicates the obvious changes due to the CDW and SP transitions, while that of 27Al(II) takes a constant value. The density of state at the Fermi level at Al(I) site below 60 K would be about 0.9 times less than that above TCDW.

  12. 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.

  13. Alexandria (Al Iskandariya), Egypt

    NASA Technical Reports Server (NTRS)

    2002-01-01

    This image of Alexandria was taken by astronauts on board the International Space Station in December 2000 using an Electronic Still Camera. A wider-angle view (STS088-739-90) taken from the Space Shuttle in December 1998 is available for context. Alexandria (Al Iskandariya) occupies a T-shaped peninsula and strip of land separating the Mediterranean from Lake Mariout. Originally the town was built upon a mole (stone breakwater) called Heptastadium, which joined the island of Pharos (see referenced website, below) to the mainland. Since then sedimentary deposits have widened the mole. Since 1905, when the 370,000 Alexandrians lived in an area of about 4 sq km between the two harbors, the city (population 4 million; see referenced website, below) has grown beyond its medieval walls and now occupies an area of about 300 sq km. The Mahmudiya Canal, connecting Alexandria with the Nile, runs to the south of the city and, by a series of locks, enters the harbor of the principal port of Egypt (note ships). The reddish and ochre polygons west of Lake Mariout are salt-evaporation, chemical-storage, and water-treatment ponds within the coastal lagoon. Reference Youssef Halim and Fatma Abou Shouk, 2000, Human impacts on Alexandria's marine environment: UNESCO, Coastal Regions and Small Islands Unit (CSI), Coastal Management Sourcebooks 2 (accessed December 20, 2000) Additional photographs taken by astronauts can be viewed at NASA-JSC's Gateway to Astronaut Photography of Earth. Image ISS001-ESC-5025 provided by the Earth Sciences and Image Analysis Laboratory, Johnson Space Center.

  14. Undulators at the ALS

    SciTech Connect

    Hoyer, E.; Akre, J.; Chin, J.

    1994-07-01

    At Lawrence Berkeley Laboratory`s (LBL) Advanced Light Source (ALS), three 4.6 m long undulators have been completed, tested and installed. A fourth is under construction. The completed undulators include two 5.0 cm period length, 89 period devices (U5.0s) which achieve a 0.85 T effective field at a 14 mm minimum gap and a 8.0 cm period length, 55 period device (U8.0) that reaches a 1.2 T effective field at a 14 mm minimum gap. The undulator under construction is a 10.0 cm period length, 43 period device (U10.0) that is designed to achieve 0.98 T at a 23 mm gap. Undulator magnetic gap variation (rms) is within 25 microns over the periodic structure length. Reproducibility of the adjustable magnetic gap has been measured to be within +/{minus} 5 microns. Gap adjusting range is from 14 mm to 210 mm, which can be scanned in one minute. The 5.1 m long vacuum chambers are flat in the vertical direction to within 0.74 mm and straight in the horizontal direction to within 0.08 mm over the 4.6 m magnetic structure sections. Vacuum chamber base pressures after UHV beam conditioning are. in the mid 10{sup {minus}11} Torr range and storage ring operating pressures with full current are in the low 10{sup {minus}10} Torr range. Measurements show that the uncorrelated magnetic field errors are 0.23%, and 0.20% for the two U5.Os and the U8.0 respectively and that the field integrals are small over the 1 cm by 6 cm beam aperture. Device description, fabrication, and measurements are presented.

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

    NASA Astrophysics Data System (ADS)

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

    2005-07-01

    We present 3D-NEMD results for the velocity dependence of the frictional force at smooth and roughened interfaces for Ta and Al single crystals. For Ta/Al we consider Ta (100)/Al (100) and Ta (110)/Al (111) interfaces sliding along [001] and [11&-circ;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, v^-β, with β = 3/4. We discuss the structural changes that influence dissipation in these regimes.

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

    NASA Astrophysics Data System (ADS)

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

    2006-07-01

    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¯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 ∝ v-β with β=3/4. We discuss the structural changes that influence dissipation in each of these regimes.

  17. Properties of HAlO, AlO, Al, and Al2O3 Clusters

    NASA Astrophysics Data System (ADS)

    Dong, Yi; Springborg, Michael

    2009-08-01

    Upon heating, nanostructured, stoichiometric HAlO looses its hydrogen. The resulting AlO material may be unstable against segregation into Al and Al2O3. In order to understand these processes further, we have carried through calculations on (HAlO)n, (AlO)n, (Al)n, and (Al2O3)n clusters and shall report the results of the study. The calculations were performed using a combination of genetic algorithms for the unbiased determination of the structure of the global total-energy minimum and of a parameterized, density-functional tight-binding method for the calculation of the properties for a given structure. We shall focus on structural motifs, stability, and the spatial distribution of the different types of atoms.

  18. Intercombination lines of Al VIII, Al IX, and Al X ions

    SciTech Connect

    Denne, B.; Hinnov, E.

    1984-06-01

    Several aluminum lines observed in the Princeton Large Torus tokamak discharges have been identified as intersystem transitions, establishing the energies of the Al VIII 2s2p/sup 3/ /sup 5/S, Al IX 2s2p/sup 2/ /sup 4/P, and Al X 2s2p /sup 3/P terms. Some observations of isoelectronic transitions in scandium and titanium ions are also reported.

  19. Al-26 and circumstellar envelopes

    NASA Technical Reports Server (NTRS)

    Glassgold, A. E.

    1995-01-01

    The effects of the radioactive decay of Al-26 on the circumstellar envelopes of asymptotic giant branch stars are analyzed. The gamma-rays emitted by the product nucleus Mg-26 escape most envelopes, but the beta-decay positrons are stopped and can ionize and heat the gas. The ionization may produce observable effects in C-rich circumstellar envelopes, particularly if the photospheric Al-26 abundance is as large as inferred from measurements of live Al-26 in the primitive solar nebula or the observations of interstellar 1.8 MeV gamma-rays. For the nearby carbon star IRC +10216, the measured abundance of the molecular ion HCO(+) provides an upper limit of about 4 x 10(exp -3) for the photospheric Al-26/Al-27 ratio, consistent with presolar SiC grains with about the same C-12/C-13 ratio.

  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. 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.

  2. 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.

  3. 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

  4. 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

  5. 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.

  6. 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.

  7. Bound and resonant surface states at the (110) surfaces of AlSb, AlAs, and AlP

    SciTech Connect

    Beres, R.P.; Allen, R.E.; Buisson, J.P.; Bowen, M.A.; Blackwell, G.F.; Hjalmarson, H.P.; Dow, J.D.

    1982-07-01

    The dispersion curves E(k-bar) have been calculated for bound and resonant (110) surface states of AlSb, AlAs, and AlP. AlSb is predicted to have no surface states within the bulk fundamental band gap, but AlAs and AlP are predicted to have surface state band minima which are very near the conduction band edge, and could lie either within the gap or immediately above the edge.

  8. 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

  9. AlN/Fe/AlN nanostructures for magnetooptic magnetometry

    SciTech Connect

    Lišková-Jakubisová, E. Višňovský, 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 λ = 410 nm (3.02 eV) and operate at oblique light incidence angles, φ{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 φ{sup (0)} ≈ 5° and longitudinal Kerr effect spectra (φ{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.

  10. AlN/Fe/AlN nanostructures for magnetooptic magnetometry

    NASA Astrophysics Data System (ADS)

    Lišková-Jakubisová, E.; VišÅovský, Š.; Široký, P.; Hrabovský, D.; Pištora, J.; Harward, I.; Celinski, Z.

    2014-05-01

    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 λ = 410 nm (3.02 eV) and operate at oblique light incidence angles, φ(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 φ(0) ≈ 5° and longitudinal Kerr effect spectra (φ(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.

  11. 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.

  12. ASK Talks with Al Diaz

    NASA Technical Reports Server (NTRS)

    Diaz, Alphonso; OKeefe, Sean

    2004-01-01

    Following the release of the Columbia Accident Investigation Board (CAIB) Report, Alphonso (Al) Diaz, Goddard Center director, was asked by NASA Administrator Sean O'Keefe to head up the Agency's response. The Diaz team, as it came to be known, was changed with making sure the CAIB Report did not become another dusty volume on a shelf of old Agency reviews.

  13. 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

  14. 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).

  15. 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.

  16. Thermal conductance of a pressed Al-Al contact

    NASA Astrophysics Data System (ADS)

    Wanner, M.

    1981-01-01

    Thermal conductance of a screw-fastened joint between two blocks of Al-alloys has been measured. An AlMg4.5Mn-block, the end of which is cooled by liquid helium, constitutes the upper part of the sample and the contact is formed at the face surface of a cylindrical extension of that block onto which a cylinder, made of AlMgSi1, is pressed by means of a copper-nickel screw. Pressing of the contact was carried out at room temperature by applying a defined torque, M, to the fastening screw. Three samples of the same shape but with differently treated surfaces of contact (machined flat, electro-chemically polished, with gold plated contacts) were studied. The results showed that the machined flat surfaces yield the best contact and that the contact conductance (measured in the range 4.2 K to 1.8 K) of all samples increased with increasing torque. In addition to thermal measurements, a study of the electrical conductance would be very interesting to determine the different contributions of phonon and electron heat conduction by means of the Wiedemann-Franz law. The work is useful for the GIRL (German Infra-Red Laboratory) space experiment.

  17. Effect of interface geometry on electron tunnelling in Al/Al2O3/Al junctions

    NASA Astrophysics Data System (ADS)

    Koberidze, M.; Feshchenko, A. V.; Puska, M. J.; Nieminen, R. M.; Pekola, J. P.

    2016-04-01

    We investigate how different interface geometries of an Al/Al2O3 junction, a common component of modern tunnel devices, affect electron transport through the tunnel barrier. We study six distinct Al/Al2O3 interfaces which differ in stacking sequences of the metal and the oxide surface atoms and the oxide termination. To construct model potential barrier profiles for each examined geometry, we rely on first-principles density-functional theory (DFT) calculations for the barrier heights and the shapes of the interface regions as well as on experimental data for the barrier widths. We show that even tiny variations in the atomic arrangement at the interface cause significant changes in the tunnel barrier parameters and, consequently, in electron transport properties. Especially, we find that variations in the crucial barrier heights and widths can be as large as 2 eV and 5 Å, respectively. Finally, to gain information about the average properties of the measured junction, we fit the conductance calculated within the Wentzel-Kramers-Brillouin approximation to the experimental data and interpret the fit parameters with the help of the DFT results.

  18. Tunneling through Al/AlOx/Al junction: Analytical models and first-principles simulations

    NASA Astrophysics Data System (ADS)

    Zemanová Diešková, M.; Ferretti, A.; Bokes, P.

    2013-05-01

    Ultrathin AlOx layers are nowadays widely employed to make tunneling junctions and, as a common practice, experimental transport data are often rationalized in terms of analytical models invoking effective electronic and geometric properties of the oxide layer. In this paper we examine the reliability of such models by performing first-principles simulations of the transport properties of Al/AlOx/Al junctions. The band gap, effective mass, and interface width obtained from ground state density-functional calculations are used within a potential barrier model, known also as the Simmons model, and its predictions of the conductance are compared with first-principles results. We also propose an analytical expression for the conductance based on a tight-binding model of the interface oxide. We show that the success of the potential barrier model in fitting experimental transport measurements rests on its formal similarity with the tight binding model which, in contrast to the former, is directly related to the realistic electronic structure of the interface.

  19. The effect of Si in Al-alloy on electromigration performance in Al filled vias

    NASA Astrophysics Data System (ADS)

    Kageyama, Makiko; Hashimoto, Keiichi; Onoda, Hiroshi

    1998-01-01

    Electromigration performance of vias filled with Al-Si-Cu alloys on Ti glue layers was investigated in comparison with W-stud vias. In Al-Si-Cu filled vias, voids were formed at only a few locations in the test structure, while voids were formed at every via in W-stud via chains. It is supposed that Al moves through the Al-Si-Cu via during electromigration in spite of the existence of a glue layer at the via bottom. This phenomenon was observed only in the vias filled with Al-Si-Cu alloy. Al movement was prohibited in Al-Cu filled vias. In Al-Si-Cu filled vias, an Al-Ti-Si alloy was formed at the via bottom while Al3Ti was formed at Al-Cu filled vias. Al is speculated to move through this Al-Ti-Si alloy during electromigration.

  20. Dehydrogenation of benzene on liquid Al100(+).

    PubMed

    Leslie, Katheryne L; Jarrold, Martin F

    2013-03-14

    The reactions of benzene on Al100(+) have been investigated as a function of cluster temperature (300-1100 K) and relative kinetic energy (1-14 eV) by low-energy ion-beam methods and mass spectrometry. Benzene chemisorbs on both solid and liquid aluminum clusters to generate Al100C6D6(+). A series of Al(100-n)(+) (n = 1, 2, 3, ...) products was also observed. As the cluster temperature was raised above the melting temperature of Al100(+), the Al100C6D6(+) product dehydrogenates to form Al100C6D4(+), Al100C6D2(+), and Al100C6(+). The degree of dehydrogenation was measured as a function of temperature. Very little Al100C6D2(+) was observed, suggesting that the losses of the second and third D2 molecules are coordinated. PMID:23445466

  1. Emerging mechanisms of molecular pathology in ALS

    PubMed Central

    Peters, Owen M.; Ghasemi, Mehdi; Brown, Robert H.

    2015-01-01

    Amyotrophic lateral sclerosis (ALS) is a devastating degenerative disease characterized by progressive loss of motor neurons in the motor cortex, brainstem, and spinal cord. Although defined as a motor disorder, ALS can arise concurrently with frontotemporal lobal dementia (FTLD). ALS begins focally but disseminates to cause paralysis and death. About 10% of ALS cases are caused by gene mutations, and more than 40 ALS-associated genes have been identified. While important questions about the biology of this disease remain unanswered, investigations of ALS genes have delineated pathogenic roles for (a) perturbations in protein stability and degradation, (b) altered homeostasis of critical RNA- and DNA-binding proteins, (c) impaired cytoskeleton function, and (d) non-neuronal cells as modifiers of the ALS phenotype. The rapidity of progress in ALS genetics and the subsequent acquisition of insights into the molecular biology of these genes provide grounds for optimism that meaningful therapies for ALS are attainable. PMID:25932674

  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. Reply to Pachai et al.

    PubMed

    Harrison, William J; Bex, Peter J

    2016-05-01

    Peripheral vision is fundamentally limited by the spacing between objects. When asked to report a target's identity, observers make erroneous reports that sometimes match the identity of a nearby distractor and sometimes match a combination of target and distractor features. The classification of these errors has previously been used to support competing 'substitution' [1] or 'averaging' [2] models of the phenomenon known as 'visual crowding'. We recently proposed a single model in which both classes of error occur because observers make their reports by sampling from a biologically-plausible population of weighted responses within a region of space around the target [3]. It is critical to note that there is no probabilistic substitution or averaging process in our model; instead, we argue that neither substitution nor averaging occur, but that these are misclassifications of the distribution of reports that emerge when a population response distribution is sampled. This is a fundamentally different way of thinking about crowding, and on this basis we claim to have provided a mechanism unifying categorically distinct perceptual errors. Our goal was not to model all crowding phenomena, such as the release from crowding when target and flanks differ in color or depth [4]. Pachai et al.[5] have suggested that our model is not unifying because it inaccurately predicts perceptual performance for a particular stimulus. Although we agree that our model does not predict their data, this specific demonstration overlooks the critical aspect of the model: perceptual reports are drawn from a weighted population code. We show that Pachai et al.'s [5] own data actually provide evidence for the population code we have described [3], and we suggest a biologically-plausible analysis of their stimuli that provides a computational basis for their 'grouping' account of crowding. PMID:27166690

  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. The ALS project: lessons learned

    NASA Astrophysics Data System (ADS)

    Monckton, Simon; Collier, Jack; Giesbrecht, Jared; Broten, Greg; MacKay, David; Erickson, David; Verret, Sean; Digney, Bruce

    2006-05-01

    In support of Canadian Forces transformation, Defence R&D Canada (DRDC) has established an ongoing program to develop machine intelligence for semi-autonomous vehicles and systems. Focussing on mine clearance and remote scouting for over a decade, DRDC Suffield has developed numerous UGVs controlled remotely over point-to-point radio links. Though this strategy removes personnel from potential danger, DRDC recognized that human factors and communications bandwidth limit teleoperation and that only networked, autonomous unmanned systems can conserve these valuable resources. This paper describes the outcome of the first autonomy project, Autonomous Land Systems (ALS), designed to demonstrate basic autonomous multivehicle land capabilities.

  7. An XPS study of Al 2Au and AlAu 4 intermetallic oxidation

    NASA Astrophysics Data System (ADS)

    Xu, C.; Sritharan, T.; Mhaisalkar, S. G.; Srinivasan, M.; Zhang, S.

    2007-05-01

    Samples of Al 2Au and AlAu 4 were examined using XPS after controlled oxidation in air. AlAu 4 showed a strong tendency to oxidize compared to Al 2Au. The binding energies (b.e.) of Au 4f and Al 2p XPS emissions were determined for both intermetallics. Heavy oxidation of AlAu 4 resulted in a unique Au 4f emission near the surface which was attributed to Au dissolved in aluminum oxide.

  8. 77 FR 73732 - In the Matter of Amendment of the Designation of al-Qa'ida in Iraq, aka Jam'at al Tawhid wa'al...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-11

    ... Matter of Amendment of the Designation of al-Qa'ida in Iraq, aka Jam'at al Tawhid wa'al-Jihad, aka The... al-Rafidayn, aka The Organization of al-Jihad's Base of Operations in Iraq, aka al-Qaida of Jihad in Iraq, aka al-Qaida in Iraq, aka al-Qaida in Mesopotamia, aka al-Qaida in the Land of the Two...

  9. Benefits for Military Veterans with ALS

    MedlinePlus

    ... Chapters Certified Centers and Clinics Support Groups About ALS About Us Our Research In Your Community Advocate ... Veterans Resources for Military Veterans, Families & Survivors The ALS Association is working everyday to support people with ...

  10. Impurity effects on the solidification of primary Al3(Sc,Zr) phase in Al alloys

    NASA Astrophysics Data System (ADS)

    Li, J. H.; Schumacher, P.

    2016-03-01

    The nucleation and growth of primary Al3Sc phase has been investigated in high purity Al alloys and commercial purity Al alloys, with a special focus on the impurity effects. In the case of high purity Al alloys, most primary Al3Sc phases were pushed to grain boundaries during moving solidification front. Such type of primary Al3Sc phase does not contribute to the heterogeneous nucleation and thereby no significant grain refinement of Al alloys was observed, although some Al3Sc particles remain the same orientation with the Al matrix. In the case of commercial purity Al alloy, the presence of impurities, e.g. Ti, Fe and Si, enhances the heterogeneous nucleation of primary Al3Sc phase. Most primary Al3Sc phases are located within the Al matrix, and keep the same orientation with the Al matrix. Furthermore, the presence of impurities also changes the growth mode of primary Al3Sc phase. In the case of commercial purity Al alloy, a layer by layer growth was observed. This investigation demonstrates that impurities have important effects on the nucleation and growth of primary Al3Sc phases in Al based alloys.

  11. 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.

  12. 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.

  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. 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.

  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. 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.

  17. 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.

  18. 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.

  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. 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.

  1. Formation of Al2O3/Al Composites by Directed Melt Oxidation of Al-Si-Zn Alloy

    NASA Astrophysics Data System (ADS)

    Zhao, Jingzhong; Chai, Huiping; Zhang, Fajian

    2010-02-01

    Observations are presented on the initiation and growth of Al2O3/Al composites by the directed melt oxidation of Al-Si alloys containing metallic Zn or using external dopant ZnO. Thermal gravimetric analysis, optical microscopy, and x-ray diffraction analysis were employed to characterize the progress of oxidation and the nature of oxidation products. Both Zn and ZnO dopants were able to initiate the directed melt oxidation of Al-Si alloys without any Mg being present. Al2O3/Al composites were produced when the alloying Zn concentration exceeding 3 wt.%. The incubation period of the oxidation process for Al-Si-Zn alloys was shortened markedly and the amount of composite products increased with the increasing of Zn content in the alloy. In addition, doping with ZnO powder resulted in dense composite formation. A macroscopically planar surface and a fine microstructure promote oxidation growth in Al2O3/Al composites. Doping with ZnO powder offers a significant advantage over using metallic Zn for the directed melt oxidation of Al-Si alloy.

  2. 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.

  3. 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/2014ApSS..292..620C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014ApSS..292..620C"><span id="translatedtitle">Influences of <span class="hlt">Al</span> particles on the microstructure and property of electrodeposited Ni-<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>Cai, Fei; Jiang, Chuanhai</p> <p>2014-02-01</p> <p>Ni-<span class="hlt">Al</span> composite coatings with different contents of <span class="hlt">Al</span> microparticles were prepared from a conventional Watt bath. The influences of <span class="hlt">Al</span> particle loadings in the bath on the surface morphology, composition, texture, grain size, microstrain, residual stress and anti-corrosion of the Ni-<span class="hlt">Al</span> composite coating were investigated. The friction coefficients of the coatings at 200 °C were also evaluated by a pin-on-disctribometer. The results showed that the surface morphology of the coatings changed from pyramid + colonied structure to colonied structure with increasing <span class="hlt">Al</span> particle loadings. The (2 0 0) preferred orientation for pure Ni coating evolved to random orientation with increasing <span class="hlt">Al</span> particle loadings. The grain size obtained the minimum value of 72.28 nm at <span class="hlt">Al</span> particle loading of 100 g/L and the microstrain of the coating increased with increasing the <span class="hlt">Al</span> particle loadings. The incorporation of <span class="hlt">Al</span> particles decreased the residual stress of the electro-deposited coating and all the coatings deposited at different <span class="hlt">Al</span> particle loadings possessed low residual stress. As the <span class="hlt">Al</span> particle loading increased, the anti-corrosion of the Ni-<span class="hlt">Al</span> coatings increased owing to the combined effect of increasing <span class="hlt">Al</span> content in the coatings and the texture evolution from (2 0 0) plane to (1 1 1) plane. The wear result suggested that the increasing <span class="hlt">Al</span> particle content did not improve the wear performance of the Ni-<span class="hlt">Al</span> composite coatings.</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/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://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://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/2015JAP...118m5305S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JAP...118m5305S"><span id="translatedtitle">Chemical mixing at "<span class="hlt">Al</span> on Fe" and "Fe on <span class="hlt">Al</span>" interfaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Süle, P.; Kaptás, D.; Bujdosó, L.; Horváth, Z. E.; Nakanishi, A.; Balogh, J.</p> <p>2015-10-01</p> <p>The chemical mixing at the "<span class="hlt">Al</span> on Fe" and "Fe on <span class="hlt">Al</span>" interfaces was studied by molecular dynamics simulations of the layer growth and by 57Fe Mössbauer spectroscopy. The concentration distribution along the layer growth direction was calculated for different crystallographic orientations, and atomically sharp "<span class="hlt">Al</span> on Fe" interfaces were found when <span class="hlt">Al</span> grows over (001) and (110) oriented Fe layers. The <span class="hlt">Al</span>/Fe(111) interface is also narrow as compared to the intermixing found at the "Fe on <span class="hlt">Al</span>" interfaces for any orientation. Conversion electron Mössbauer measurements of trilayers—<span class="hlt">Al</span>/57Fe/<span class="hlt">Al</span> and <span class="hlt">Al</span>/57Fe/Ag grown simultaneously over Si(111) substrate by vacuum evaporation—support the results of the molecular dynamics calculations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4815872','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4815872"><span id="translatedtitle">Orientation relationship of eutectoid Fe<span class="hlt">Al</span> and Fe<span class="hlt">Al</span>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>Scherf, A.; Kauffmann, A.; Kauffmann-Weiss, S.; Scherer, T.; Li, X.; Stein, F.; Heilmaier, M.</p> <p>2016-01-01</p> <p>Fe–<span class="hlt">Al</span> alloys in the aluminium range of 55–65 at.% exhibit a lamellar microstructure of B2-ordered Fe<span class="hlt">Al</span> and triclinic Fe<span class="hlt">Al</span>2, which is caused by a eutectoid decomposition of the high-temperature Fe5<span class="hlt">Al</span>8 phase, the so-called ∊ phase. The orientation relationship of Fe<span class="hlt">Al</span> and Fe<span class="hlt">Al</span>2 has previously been studied by Bastin et <span class="hlt">al</span>. [J. Cryst. Growth (1978 ▸), 43, 745] and Hirata et <span class="hlt">al</span>. [Philos. Mag. Lett. (2008 ▸), 88, 491]. Since both results are based on different crystallographic data regarding Fe<span class="hlt">Al</span>2, the data are re-evaluated with respect to a recent re-determination of the Fe<span class="hlt">Al</span>2 phase provided by Chumak et <span class="hlt">al</span>. [Acta Cryst. (2010 ▸), C66, i87]. It is found that both orientation relationships match subsequent to a rotation operation of 180° about a 〈112〉 crystallographic axis of Fe<span class="hlt">Al</span> or by applying the inversion symmetry of the Fe<span class="hlt">Al</span>2 crystal structure as suggested by the Chumak data set. Experimental evidence for the validity of the previously determined orientation relationships was found in as-cast fully lamellar material (random texture) as well as directionally solidified material (∼〈110〉Fe<span class="hlt">Al</span> || solidification direction) by means of orientation imaging microscopy and global texture measurements. In addition, a preferential interface between Fe<span class="hlt">Al</span> and Fe<span class="hlt">Al</span>2 was identified by means of trace analyses using cross sectioning with a focused ion beam. On the basis of these habit planes the orientation relationship between the two phases can be described by (01)Fe<span class="hlt">Al</span> || (114) and [111]Fe<span class="hlt">Al</span> || [10]. There is no evidence for twinning within Fe<span class="hlt">Al</span> lamellae or alternating orientations of Fe<span class="hlt">Al</span> lamellae. Based on the determined orientation and interface data, an atomistic model of the structure relationship of Fe5<span class="hlt">Al</span>8, Fe<span class="hlt">Al</span> and Fe<span class="hlt">Al</span>2 in the vicinity of the eutectoid decomposition is derived. This model is analysed with respect to the strain which has to be accommodated at the interface of Fe<span class="hlt">Al</span> and Fe<span class="hlt">Al</span>2. PMID:27047304</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://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> <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://eric.ed.gov/?q=Cultural+AND+Heritage%2c&pg=5&id=EJ997797','ERIC'); return false;" href="http://eric.ed.gov/?q=Cultural+AND+Heritage%2c&pg=5&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.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://adsabs.harvard.edu/abs/2009LanB..44A..174F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009LanB..44A..174F"><span id="translatedtitle"><span class="hlt">Al</span>As: camel's back parameter</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Fernandes da Silva, E. C.</p> <p></p> <p>This document is part of Volume 44 `Semiconductors', Subvolume A `New Data and Updates for I-VII, III-V, III-VI and IV-VI Compounds' of Landolt-Börnstein Group III `Condensed Matter'. It contains data on <span class="hlt">Al</span>As (aluminum arsenide), Element System <span class="hlt">Al</span>-As.</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://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> </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://www.osti.gov/scitech/biblio/15020715','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/15020715"><span id="translatedtitle">Stress Corrosion Cracking of <span class="hlt">Al</span>-Mg and Mg-<span class="hlt">Al</span> Alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Jones, Russell H.; Vetrano, John S.; Windisch, Charles F.</p> <p>2004-12-01</p> <p>Aluminum and magnesium based alloys are being used for reducing the weight of automobiles. For structural applications they must have adequate stress corrosion resistance and yet, under some circumstances, stress corrosion cracking can occur in both alloy systems. Precipitation of the Mg rich Beta-phase (<span class="hlt">Al</span>3Mg2) at grain boundaries of <span class="hlt">Al</span>-Mg alloys and the Beta-phase (Mg17<span class="hlt">Al</span>12) at grain boundaries of the Mg-<span class="hlt">Al</span> alloys are critical factors in their stress corrosion performance. In Mg-<span class="hlt">Al</span>, the Beta-phase is cathodic to the matrix while in the <span class="hlt">Al</span>-Mg case, the Beta-phase is anodic to the matrix. These phases produce localized galvanic induced-corrosion that leads to intergranular stress corrosion cracking and cracking growth rates of 5 and 103 times faster than the solution treated condition, for <span class="hlt">Al</span>-Mg and Mg-<span class="hlt">Al</span>, respectively.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/353217','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/353217"><span id="translatedtitle">U-<span class="hlt">Al</span> alloy charge makeup equation</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rhode, F.C.</p> <p>1988-12-13</p> <p>The {sup 235}U content in fuel tubes (g{sup 235}U/ft) is directly proportional to the {sup 235}U concentration (g{sup 235}U/cc) in the U-<span class="hlt">Al</span> core alloy. In order to prepare enriched uranium metal, aluminum, and U-<span class="hlt">Al</span> scrap for U-<span class="hlt">Al</span> production melts, the overall alloy composition (wt % U-<span class="hlt">Al</span>) must be calculated for the desired {sup 235}U concentration (g{sup 235}U/cc) and uranium enrichment (*wt % {sup 235}U). This memorandum documents an alternative equation for calculation of U-<span class="hlt">Al</span> alloy casting compositions in Building 321-M. This equation confirms the results of another, undocumented equation that has been used in the past.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23890868','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23890868"><span id="translatedtitle"><span class="hlt">Al</span>-Akhawayni's description of pulmonary circulation.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Yarmohammadi, Hassan; Dalfardi, Behnam; Rezaian, Jafar; Ghanizadeh, Ahmad</p> <p>2013-10-01</p> <p>Since antiquity, heart function and the mechanism of blood circulation within the human body have been the focus of attention of scientists from different parts of the world. Over the passage of time, the theories and works of these scientists have resulted in the achievement of today's knowledge of circulation. The medieval Persian scholar, <span class="hlt">Al</span>-Akhawayni Bukhari (?-983AD), is among the physicians who investigated both the anatomy and the physiology of the human body. <span class="hlt">Al</span>-Akhawayni describes the mechanism of pulmonary circulation in his only extant book, "Hidayat <span class="hlt">al</span>-Muta`llemin fi <span class="hlt">al</span>-Tibb" (A Scholar's Guide to Medicine) with which he made a contribution to the development of knowledge regarding this mechanism in the medicine of the Islamic world. In this paper, <span class="hlt">Al</span>-Akhawayni's viewpoints on anatomy and the function of the heart, its related vessels, and also pulmonary circulation will be briefly discussed. PMID:23890868</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://ntrs.nasa.gov/search.jsp?R=19840053031&hterms=Trigger+points&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3DTrigger%2Bpoints','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19840053031&hterms=Trigger+points&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3DTrigger%2Bpoints"><span id="translatedtitle"><span class="hlt">Al</span>-26 in the interstellar medium</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Clayton, D. D.</p> <p>1984-01-01</p> <p>The amount of dispersed interstellar <span class="hlt">Al</span>-26 detected by the HEAO 3 gamma-ray spectrometer cannot have been synthesized by supernova explosions if current calculations of the production ratio p(26)/p(27) approximately equal to 0.001 are correct. Simple models of chemical evolution of the Galaxy are presented to explain this point. The observed <span class="hlt">Al</span>-26 is more likely due to about 100 million dispersed novae, or to a single old (10,000-1,000,000 yr) supernova remnant that today surrounds the solar system. If the <span class="hlt">Al</span>-26 is dispersed, the high interstellar ratio today <span class="hlt">Al</span>-26/<span class="hlt">Al</span>-27 about equal to 0.00002 calls into question the requirement that a supernova trigger for formation of the solar system was the cause of a concentration 3-times larger. Also discussed is p-process production in novae with application to the question of live Sm-146 in the solar system.</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/2003EAEJA....14868S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003EAEJA....14868S"><span id="translatedtitle"><span class="hlt">AL</span>(0) in municipal waste incinerator ash</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Stipp, S. L.; Ronsbo, J. G.; Zunic, T. B.; Christensen, T. H.</p> <p>2003-04-01</p> <p>Disposal of municipal waste is a challenge to society. Waste volume is substantially decreased by incineration but residual ash usually contains a number of toxic components which must be immobilised to insure environmental protection. One element, chromium, is mobile and toxic in its oxidised state as Cr(VI) but it can be reduced to Cr(III) and immobilised. Reduction can be promoted by ash treatment with Fe(0) or Fe(II), but recent evidence shows that at least some Cr(VI) is reduced spontaneously in the ash. Aspects of ash behaviour suggest metallic aluminium as the reducing agent, but no direct evidence of <span class="hlt">Al</span>(0) has been found until now. We examined filter ash from an energy-producing, municipal-waste incinerator (Vest-forbrænding) near Copenhagen. X-ray diffraction (XRD) identified expected salts of Na, K and Ca such as halite, sylvite, calcite, anhydrite and gypsum as well as quartz, feldspar and some hematite. Wave-dispersive electron microprobe produced elemen-tal maps of the ash; <span class="hlt">Al</span>-rich areas were analysed quantitatively by comparison with standards. We identified metallic <span class="hlt">Al</span> particles, averaging 50 to 100 micrometers in di-ameter, often with a fractured, glassy border of aluminum oxide. The particles were porous, explaining fast Cr(VI) reduction and they contained thin exsolution lamellae of <span class="hlt">Al</span>-alloys of Pb and Cu or Mn, Fe and Ag, which provide clues of the <span class="hlt">Al</span>(0) origin in the waste. Sometimes <span class="hlt">Al</span>(0) occurred inside glassy globes of <span class="hlt">Al</span>2O3. Time-of-flight secondary ion mass spectroscopy (TOF-SIMS) and X-ray photoelectron spectroscopy (XPS) proved that surface <span class="hlt">Al</span> concentrations on ash particles were below detection, confirming reactivity of the <span class="hlt">Al</span>(0) bulk. The persistence of reduced <span class="hlt">Al</span> through the highly oxidising combustion procedure comes as a surprise and is a benefit in the immobilisation of Cr(VI) from municipal-waste incineration residues.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003ApPhL..82.2832D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003ApPhL..82.2832D"><span id="translatedtitle">The use of Simmons' equation to quantify the insulating barrier parameters in <span class="hlt">Al/AlOx/Al</span> tunnel junctions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Dorneles, L. S.; Schaefer, D. M.; Carara, M.; Schelp, L. F.</p> <p>2003-04-01</p> <p>We have analyzed the electron transport processes in <span class="hlt">Al/AlOx/Al</span> junctions. The samples were produced by glow-discharge-assisted oxidation of the bottom electrode. The nonlinear I-V curves of 17 samples were measured at room temperature, being very well fitted using the Simmons' equation with the insulating barrier thickness, barrier height, and the junction area as free parameters. An exponential growth of the area normalized electrical resistance with thickness is obtained, using just values from I-V curve simulations. The effective tunneling area corresponding to the "hot spots" can be quantified and is five orders of magnitude smaller than the physical area in the studied samples.</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.ncbi.nlm.nih.gov/pubmed/22335280','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/22335280"><span id="translatedtitle">Localized <span class="hlt">AL</span> amyloidosis: a suicidal neoplasm?</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Westermark, Per</p> <p>2012-05-01</p> <p>Although <span class="hlt">AL</span> amyloidosis usually is a systemic disease, strictly localized <span class="hlt">AL</span> deposits are not exceptionally rare. Such case reports form a considerable body of published articles. Although both <span class="hlt">AL</span> amyloidosis types are formed from an N-terminal segment of a monoclonal immunoglobulin light chain, a typical localized <span class="hlt">AL</span> amyloid differs from the systemic counterpart by the morphological appearance of the amyloid, and presence of clonal plasma cells and of giant cells. In this article it is pointed out that localized <span class="hlt">AL</span> amyloidosis ('amyloidoma') represents a true plasma cell neoplasm and not a pseudotumor. The pathogenesis of localized <span class="hlt">AL</span> amyloidosis may differ from that of the systemic type, a suggestion underlined by the fact that localized <span class="hlt">AL</span> amyloidosis of kappa type is as common as that of lambda origin, in contrast to the systemic form where lambda chains constitute the overwhelming majority of cases. It is suggested that oligomeric assemblies of the produced immunoglobulin light chain are toxic to plasma cells, which in this way commit suicide. PMID:22335280</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003A%26A...412L..47K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003A%26A...412L..47K"><span id="translatedtitle">Line shape diagnostics of Galactic 26<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>Kretschmer, K.; Diehl, R.; Hartmann, D. H.</p> <p>2003-12-01</p> <p>The shape of the gamma-ray line from radioactive 26<span class="hlt">Al</span>, at 1808.7 keV energy in the frame of the decaying isotope, is determined by its kinematics when it decays, typically 106 y after its ejection into the interstellar medium from its nucleosynthesis source. Three measurements of the line width exist: HEAO-C's 1982 value of (0+3) keV FWHM, the GRIS 1996 value of (5.4+/- 1.3) keV FWHM, and the recent RHESSI value of (2.0+/- 0.8) keV FWHM, suggesting either ``cold'', ``hot'', or ``warm'' 26<span class="hlt">Al</span> in the ISM. We model the line width as expected from Galactic rotation, expanding supernova ejecta, and/or Wolf-Rayet winds, and predict a value below 1 keV (FWHM) with plausible assumptions about 26<span class="hlt">Al</span> initial velocities and expansion history. Even though the recent RHESSI measurement reduces the need to explain a broad line corresponding to 540 km s-1 mean 26<span class="hlt">Al</span> velocity through extreme assumptions about grain transport of 26<span class="hlt">Al</span> or huge interstellar cavities, our results suggest that standard 26<span class="hlt">Al</span> ejection models produce a line on the narrow side of what is observed by RHESSI and INTEGRAL. Improved INTEGRAL and RHESSI spatially-resolved line width measurements should help to disentangle the effects of Galactic rotation from the ISM trajectories of 26<span class="hlt">Al</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1991MTA....22..183N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1991MTA....22..183N"><span id="translatedtitle">Ni<span class="hlt">Al</span>-Based microstructurally toughened composites</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nardone, Vincent C.; Strife, James R.</p> <p>1991-01-01</p> <p>Intermetallic Ni<span class="hlt">Al</span>-based composites with dramatically higher energy absorption capability and damage tolerance have been demonstrated. The approach consisted of incorporating continuous tubular 304 stainless steel toughening regions throughout the majority phase Ni<span class="hlt">Al</span> matrix. To compensate for the increase in density resulting from the 304 stainless steel, B4C particulate was added to the Ni<span class="hlt">Al</span> so that the overall composite density was within 5 pct of the value for monolithic Ni<span class="hlt">Al</span>. The notched Charpy impact energy absorption of the B4C/Ni<span class="hlt">Al</span>/304 stainless steel composites was in the range of 15 to 90 J/cm2, compared to a value of 0.8 J/cm2 for Ni<span class="hlt">Al</span>. The higher energies were measured on samples that deflected the crack front more extensively during failure. A model has been developed that is consistent with the energy absorption values measured during notched impact testing of the composites. Finally, significant room-temperature tensile strains (20 to 35 pct) were achieved due to constrained yielding of the 304 stainless steel, which prevented composite failure after the Ni<span class="hlt">Al</span> regions had cracked.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/414333','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/414333"><span id="translatedtitle">Wet oxidation of <span class="hlt">Al</span>GaAs vs. <span class="hlt">Al</span>As: A little gallium is good</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Choquette, K.D.; Geib, K.M.; Hou, H.Q.; Lear, K.L.; Chui, H.C.; Hammons, B.E.; Nevers, J.A.; Hull, R. |</p> <p>1996-12-01</p> <p>Buried oxides formed from the wet oxidation of <span class="hlt">Al</span>GaAs alloys, rather than <span class="hlt">Al</span>As, are found to be superior in terms of oxidation isotropy, mechanical stability, and strain. It is not surprising that vertical-cavity surface-emitting lasers (VCSELs) using <span class="hlt">Al</span>GaAs oxide layers as current apertures have shown promising reliability as compared to VCSELs using <span class="hlt">Al</span>As layers. Comparisons of lifetime data for VCSELs with differing oxide layers is presented. The beneficial properties of oxides converted from <span class="hlt">Al</span>GaAs alloys are found to provide robust device processing of reliable VCSELs and may play an important role in other advanced optoelectronic devices.</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://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://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://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://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 ω = 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 (τD = 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://adsabs.harvard.edu/abs/2016JaJAP..55eFH01Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JaJAP..55eFH01Z"><span id="translatedtitle">Comparative study on interface and bulk charges in <span class="hlt">Al</span>GaN/GaN metal-insulator-semiconductor heterostructures with <span class="hlt">Al</span>2O3, <span class="hlt">Al</span>N, and <span class="hlt">Al</span>2O3/<span class="hlt">Al</span>N laminated dielectrics</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhu, Jie-Jie; Ma, Xiao-Hua; Chen, Wei-Wei; Hou, Bin; Xie, Yong; Hao, Yue</p> <p>2016-05-01</p> <p>In this paper, the interface and bulk charges in <span class="hlt">Al</span>GaN/GaN metal-insulator-semiconductor (MIS) heterostructures with <span class="hlt">Al</span>N, <span class="hlt">Al</span>2O3, and <span class="hlt">Al</span>2O3/<span class="hlt">Al</span>N laminated dielectrics were studied. In situ plasma pretreatment resulted negligible interface trap states and voltage hysteresis. The fixed charge density at <span class="hlt">Al</span>2O3/<span class="hlt">Al</span>N (or <span class="hlt">Al</span>2O3/barrier) interface was estimated to be 1.66 × 1013 cm-2 by using flat-band voltage shift, and the oxide bulk charge concentration was 2.86 × 1017 cm-3. The interface charge density at other interfaces were at the order of 1011 cm-2. Simulation results using the above charge density/concentration indicated that <span class="hlt">Al</span>2O3/<span class="hlt">Al</span>N interface fixed charges dominated the dielectric-related voltage shift in <span class="hlt">Al</span>GaN/GaN MIS heterostructures, which caused a large voltage shift of -3 V with 10 nm <span class="hlt">Al</span>2O3 thickness, while the flat-band voltage variety resulting from other types of charges was within 0.1 V.</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/1993IJMPB...7.4261K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1993IJMPB...7.4261K"><span id="translatedtitle">Effect of <span class="hlt">AL</span> on Electric Conductivity and Superconductivity of NB-Si-<span class="hlt">AL</span>-O Ceramic</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Koba, S.; Higo, S.; Hakuraku, Y.; Kawano, I.; Ogushi, T.; Nakao, A.</p> <p></p> <p>Metal-insulator transition and superconductivity with changing <span class="hlt">Al</span> composition were observed in the Nb-Si-<span class="hlt">Al</span>-O system. Semiconductor-like characteristic and normal conductive characteristic were observed for <span class="hlt">Al</span><40% and <span class="hlt">Al</span>>50% respectively. Super-conductive compositions are distributed around the boundary between those two types of conductivity, such as NbxSi<span class="hlt">Al</span>(α-x)Oz((α, x)=(1.5, 0.7), (2.0,0.8), (3.0, 0.7~1.4)). The superconductivity was confirmed by resistive transitions and diamagnetic transitions. The superconductors in this study have Tc=10.0~11.5 K with resistive transitions, and the amplitudes of the diamagnetism reach 30~58% of that of pure Nb powder. X-ray diffraction patterns of any other superconducting Nb-systems such as Nb, Nb3<span class="hlt">Al</span>, Nb3Si, NbN, and NbC, have not been observed in Nb-Si-<span class="hlt">Al</span>-O.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JEMat.tmp..235C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JEMat.tmp..235C"><span id="translatedtitle">Characterization of <span class="hlt">AlInN/Al</span>N/GaN Heterostructures with Different <span class="hlt">Al</span>N Buffer Thickness</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Çörekçi, S.; Dugan, S.; Öztürk, M. K.; Çetin, S. Ş.; Çakmak, M.; Özçelik, S.; Özbay, E.</p> <p>2016-05-01</p> <p>Two <span class="hlt">AlInN/Al</span>N/GaN heterostructures with 280-nm- and 400-nm-thick <span class="hlt">Al</span>N buffer grown on sapphire substrates by metal-organic chemical vapor deposition (MOCVD) have been investigated by x-ray diffraction (XRD), atomic force microscopy (AFM), photoluminescence (PL) and Hall-effect measurements. The symmetric (0002) plane with respect to the asymmetric (10bar{1} 2) plane in the 280-nm-thick <span class="hlt">Al</span>N buffer has a higher crystal quality, as opposed to the 400-nm-thick buffer. The thinner buffer improves the crystallinity of both (0002) and (10bar{1} 2) planes in the GaN layers, it also provides a sizeable reduction in dislocation density of GaN. Furthermore, the lower buffer thickness leads to a good quality surface with an rms roughness of 0.30 nm and a dark spot density of 4.0 × 108 cm-2. The optical and transport properties of the <span class="hlt">AlInN/Al</span>N/GaN structure with the relatively thin buffer are compatible with the enhancement in its structural quality, as verified by XRD and AFM results.</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/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://www.ncbi.nlm.nih.gov/pubmed/27113253','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27113253"><span id="translatedtitle"><span class="hlt">ALS</span>: Recent Developments from Genetics Studies.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Therrien, Martine; Dion, Patrick A; Rouleau, Guy A</p> <p>2016-06-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is a fatal disorder that is characterized by a progressive degeneration of the upper and lower motor neurons. Most cases appear to be sporadic, but 5-10 % of cases have a family history of the disease. High-throughput DNA sequencing and related genomic capture tools are methodological advances which have rapidly contributed to an acceleration in the discovery of genetic risk factors for both familial and sporadic <span class="hlt">ALS</span>. It is interesting to note that as the number of <span class="hlt">ALS</span> genes grows, many of the proteins they encode are in shared intracellular processes. This review will summarize some of the recent advances and gene discovery made in <span class="hlt">ALS</span>. PMID:27113253</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/90466','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/90466"><span id="translatedtitle">Wet chemical etching of <span class="hlt">Al</span>N</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mileham, J.R.; Pearton, S.J.; Abernathy, C.R.; MacKenzie, J.D.; Shul, R.J.; Kilcoyne, S.P.</p> <p>1995-08-21</p> <p>Single-crystal <span class="hlt">Al</span>N grown on <span class="hlt">Al</span>{sub 2}O{sub 3} is found to be wet etched by AZ400K photoresist developer solution, in which the active component is KOH. The etching is thermally activated with an activation energy of 15.5{plus_minus}0.4 kcal mol{sup {minus}1}, and the etch rate is found to be strongly dependent on the crystalline quality of the <span class="hlt">Al</span>N. There was no dependence of etch rate on solution agitation or any crystallographic dependence noted, and the etching is selective over other binary group III nitrides (GaN, InN) and substrate materials such as <span class="hlt">Al</span>{sub 2}O{sub 3} and GaAs. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.</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=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('https://www.gpo.gov/fdsys/pkg/FR-2011-06-20/pdf/2011-15290.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2011-06-20/pdf/2011-15290.pdf"><span id="translatedtitle">76 FR 35938 - The Designation of Othman <span class="hlt">al</span>-Ghamdi Also Known as <span class="hlt">Al</span> Umairah <span class="hlt">al</span>-Ghamdi, Also Known as Uthman <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>2011-06-20</p> <p>... Othman <span class="hlt">al</span>-Omirah as a Specially Designated Global Terrorist Pursuant to Section 1(b) of Executive Order... of terrorism that threaten the security of U.S. nationals or the national security, foreign...</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.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.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('https://www.mda.org/sites/default/files/publications/Everyday_Life_with_ALS_P-532.pdf','NIH-MEDLINEPLUS'); return false;" href="https://www.mda.org/sites/default/files/publications/Everyday_Life_with_ALS_P-532.pdf"><span id="translatedtitle">Everyday Life with <span class="hlt">ALS</span>: A Practical Guide</span></a></p> <p><a target="_blank" href="http://medlineplus.gov/">MedlinePlus</a></p> <p></p> <p></p> <p>... accuracy. Software programs such as Dragon NaturallySpeaking or IBM ViaVoice are appropriate for people with <span class="hlt">ALS</span> who ... housekeeper, 33 housework, 31 Hoyer lift, 94 I IBM ViaVoice, 85 ILC, see independent living centers immobility, ...</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.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://adsabs.harvard.edu/abs/2011AIPC.1349.1191N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AIPC.1349.1191N"><span id="translatedtitle">Magnetic Properties of Disordered Fe3<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>Nehra, J.; Kabra, K.; Jani, S.; Ranjith, P. M.; Lakshmi, N.; Venugopalan, K.</p> <p>2011-07-01</p> <p>The magnetic properties of Fe3<span class="hlt">Al</span> powders prepared by filing the ingot in both as-filed and annealed form are studied. Results of Mössbauer, X-ray diffraction and DC magnetization studies show that the magnetic properties are modified due to formation of non-magnetic Fe3<span class="hlt">Al</span>C0.5 phase due to C intercalated on filing. The hyperfine fields obtained are explained in terms of nearest and next nearest neighbor configurations of 57Fe.</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.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> </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.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4793781','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4793781"><span id="translatedtitle">How common are <span class="hlt">ALS</span> plateaus and reversals?</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Vaughan, Timothy; Wicks, Paul; Heywood, Jamie; Sinani, Ervin; Selsov, Roger; Macklin, Eric A.; Schoenfeld, David; Cudkowicz, Merit; Sherman, Alex</p> <p>2016-01-01</p> <p>Objective: To determine the frequency of amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) plateaus and reversals in the Pooled Resource Open-Access <span class="hlt">ALS</span> Clinical Trials (PRO-ACT) database. Methods: We analyzed Amyotrophic Lateral Sclerosis Functional Rating Scale (ALSFRS) and ALSFRS–revised (ALSFRS-R) data from PRO-ACT participants. The frequencies of participants experiencing plateaus (periods where scores did not change) were calculated over 6-, 12-, and 18-month epochs. The percentage of participants ever experiencing reversals (periods where scores improved) of different lengths were also calculated and plotted. Results: Over 6 months, 25% of 3,132 participants did not decline. Over 12 months, 16% of 2,105 participants did not decline. Over 18 months, 7% of 1,218 participants did not decline. Small <span class="hlt">ALS</span> reversals were also common, especially over shorter follow-up intervals; 14% of 1,343 participants had a 180-day interval where their ALSFRS-R slope was greater than zero. Fewer than 1% of participants ever experienced improvements of 4 or more ALSFRS-R points lasting at least 12 months. Conclusion: <span class="hlt">ALS</span> plateaus and small reversals are common, especially over brief intervals. In light of these data, stable disease, especially for a short period of time, should not be interpreted as an <span class="hlt">ALS</span> treatment effect. Large sustained <span class="hlt">ALS</span> reversals, on the other hand, are rare, potentially important, and warrant further study. PMID:26658909</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> <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/servlets/purl/1185327','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/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://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://www.osti.gov/pages/biblio/1185327-metastability-mgal2o4-al2o3-system','SCIGOV-DOEP'); return false;" href="http://www.osti.gov/pages/biblio/1185327-metastability-mgal2o4-al2o3-system"><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/pages">DOE PAGESBeta</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 elevatedmore » 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.« less</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/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://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 (σ) 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://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.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://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/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: Δ H min(<span class="hlt">Al</span>-Co) = -32.5 kJ/mol at x Co = 0.44; Δ 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://adsabs.harvard.edu/abs/2016MS%26E..114a2100B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016MS%26E..114a2100B"><span id="translatedtitle">Influence of RCS on <span class="hlt">Al</span>-3Mg and <span class="hlt">Al</span>-3Mg-0.25Sc alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bhovi, Prabhakar M.; Venkateswarlu, K.</p> <p>2016-02-01</p> <p>An influence of repetitive corrugation and straightening (RCS) was studied on <span class="hlt">Al</span>-3Mg and <span class="hlt">Al</span>-3Mg-0.25Sc alloys up to eight passes. Each pass consist of a corrugation and followed by straightening. This has resulted in introducing large plastic strain in sample, and thus led to formation of sub-micron grain sizes with high angle grain boundaries. These sub grain formation was eventually resulted in improved mechanical properties. The average grain size of <span class="hlt">Al</span>-3Mg-0.25Sc alloy after 8 passes yielded to ∼0.6pm. Microhardness, strength properties were evaluated and it suggests that RCS was responsible for high hardness values as compared to the as cast samples. The microhardness values after RCS were 105 HV and 130 HV for <span class="hlt">Al</span>-3Mg and <span class="hlt">Al</span>-3Mg-0.25Sc alloys, respectively. Similarly, ∼ 40% improvement in tensile strength from 240 MPa to 370 MPa was observed for <span class="hlt">Al</span>- 3Mg-0.25Sc alloy after RCS process.<span class="hlt">Al</span>-3Mg and <span class="hlt">Al</span>-3Mg-0.25Scalloys exhibited maximum strength of 220 MPa and 370 MPa, respectively. It is concluded that RCS process has a strong influence on <span class="hlt">Al</span>- 3Mg and <span class="hlt">Al</span>-3Mg-0.25Sc alloys for obtaining improved mechanical properties and grain refinement. In addition to RCS process and presence of AESc precipitates in <span class="hlt">Al</span>-3Mg-0.25Sc alloy had a significant role in grain refinement and improved mechanical properties as compared to <span class="hlt">Al</span>-3Mg alloy.</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://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> <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/2008ges..conf..247A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008ges..conf..247A"><span id="translatedtitle">Another Security Improvement over the Lin et <span class="hlt">al.'s</span> E-voting Scheme</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Asaar, Maryam Rajabzadeh; Mohajeri, Javad; Salmasizadeh, Mahmoud</p> <p></p> <p>In 2003, Lin et <span class="hlt">al</span>. have proposed an electronic voting scheme which can be utilized in large-scale elections, and claimed it detects double voting. But in this paper, by presenting an attack, we show that voters can successfully vote more than once without being detected. Hence, we propose a new modified scheme based on the Lin et <span class="hlt">al.'s</span> scheme with the same efficiency to solve this weakness and analyze its security.</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> </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/27053603','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27053603"><span id="translatedtitle">Synthesis of core-shell <span class="hlt">Al</span>OOH hollow nanospheres by reacting <span class="hlt">Al</span> nanoparticles with water.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Lozhkomoev, A S; Glazkova, E A; Bakina, O V; Lerner, M I; Gotman, I; Gutmanas, E Y; Kazantsev, S O; Psakhie, S G</p> <p>2016-05-20</p> <p>A novel route for the synthesis of boehmite nanospheres with a hollow core and the shell composed of highly crumpled <span class="hlt">Al</span>OOH nanosheets by oxidizing <span class="hlt">Al</span> nanopowder in pure water under mild processing conditions is described. The stepwise events of <span class="hlt">Al</span> transformation into boehmite are followed by monitoring the pH in the reaction medium. A mechanism of formation of hollow <span class="hlt">Al</span>OOH nanospheres with a well-defined shape and crystallinity is proposed which includes the hydration of the <span class="hlt">Al</span> oxide passivation layer, local corrosion of metallic <span class="hlt">Al</span> accompanied by hydrogen evolution, the rupture of the protective layer, the dissolution of <span class="hlt">Al</span> from the particle interior and the deposition of <span class="hlt">Al</span>OOH nanosheets on the outer surface. In contrast to previously reported methods of boehmite nanoparticle synthesis, the proposed method is simple, and environmentally friendly and allows the generation of hydrogen gas as a by-product. Due to their high surface area and high, slit-shaped nanoporosity, the synthesized <span class="hlt">Al</span>OOH nanostructures hold promise for the development of more effective catalysts, adsorbents, vaccines and drug carriers. PMID:27053603</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=20020041465&hterms=Alessandra&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3DAlessandra','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20020041465&hterms=Alessandra&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3DAlessandra"><span id="translatedtitle">The Dissociation Energies of <span class="hlt">Al</span>H2 and <span class="hlt">Al</span>Ar</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Ricca, Alessandra; Partridge, Harry; Bauschlicher, Charles W., Jr.; Visscher, Luuk; Langhoff, Stephen R. (Technical Monitor)</p> <p>1995-01-01</p> <p>The D(sub 0) values for <span class="hlt">Al</span>H2 and <span class="hlt">Al</span>Ar are computed using the coupled cluster approach in conjunction with large basis sets. Basis set superposition and spin-orbit effects are accounted for as they are sizeable due to the small binding energy. The computed dissociation energy for <span class="hlt">Al</span>Ar is 101 /cm , which is 83% of the experimental value (122.4/ cm). Our best estimate for the H2 binding energy in <span class="hlt">Al</span>H2 is 40 +/- 28 /cm.</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://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://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://ntrs.nasa.gov/search.jsp?R=19870064653&hterms=cluster+wave&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Dcluster%2Bwave','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19870064653&hterms=cluster+wave&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Dcluster%2Bwave"><span id="translatedtitle">Small <span class="hlt">Al</span> clusters. II - Structure and binding in <span class="hlt">Al</span>(n) (n = 2-6, 13)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Pettersson, Lars G. M.; Bauschlicher, Charles W., Jr.; Halicioglu, Timur</p> <p>1987-01-01</p> <p>The structure and stability of aluminum clusters containing up to six atoms have been studied using correlated wave functions and extended basis sets. The lowest energy structure is planar for <span class="hlt">Al</span>4 and <span class="hlt">Al</span>5, but three dimensional for <span class="hlt">Al</span>6. The icosahedral, hcp, fcc, and two planar structures of <span class="hlt">Al</span>13 were considered at the SCF level. The lowest energy structure is the icosahedron, but the planar structures are fairly low lying even in this case. A simplified description using two- and three-body interaction potentials is found to agree well with the ab initio structures and binding energies.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016Nanot..27t5603L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016Nanot..27t5603L"><span id="translatedtitle">Synthesis of core–shell <span class="hlt">Al</span>OOH hollow nanospheres by reacting <span class="hlt">Al</span> nanoparticles with water</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lozhkomoev, A. S.; Glazkova, E. A.; Bakina, O. V.; Lerner, M. I.; Gotman, I.; Gutmanas, E. Y.; Kazantsev, S. O.; Psakhie, S. G.</p> <p>2016-05-01</p> <p>A novel route for the synthesis of boehmite nanospheres with a hollow core and the shell composed of highly crumpled <span class="hlt">Al</span>OOH nanosheets by oxidizing <span class="hlt">Al</span> nanopowder in pure water under mild processing conditions is described. The stepwise events of <span class="hlt">Al</span> transformation into boehmite are followed by monitoring the pH in the reaction medium. A mechanism of formation of hollow <span class="hlt">Al</span>OOH nanospheres with a well-defined shape and crystallinity is proposed which includes the hydration of the <span class="hlt">Al</span> oxide passivation layer, local corrosion of metallic <span class="hlt">Al</span> accompanied by hydrogen evolution, the rupture of the protective layer, the dissolution of <span class="hlt">Al</span> from the particle interior and the deposition of <span class="hlt">Al</span>OOH nanosheets on the outer surface. In contrast to previously reported methods of boehmite nanoparticle synthesis, the proposed method is simple, and environmentally friendly and allows the generation of hydrogen gas as a by-product. Due to their high surface area and high, slit-shaped nanoporosity, the synthesized <span class="hlt">Al</span>OOH nanostructures hold promise for the development of more effective catalysts, adsorbents, vaccines and drug carriers.</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.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://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://adsabs.harvard.edu/abs/2015AIPC.1653b0023B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AIPC.1653b0023B"><span id="translatedtitle">The formation of (<span class="hlt">Al</span>8Fe2Si, <span class="hlt">Al</span>13Fe4) phases from <span class="hlt">Al</span>-Fe-Si system by TE mode</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Boulouma, A.; Drici, A.; Benaldjia, A.; Guerioune, M.; Vrel, D.</p> <p>2015-03-01</p> <p>This work prepared <span class="hlt">Al</span>8Fe2Si, <span class="hlt">Al</span>13Fe4 mixed sample by ball milling and thermal explosion techniques applying <span class="hlt">Al</span>, Fe and Si powders as precursors. Thermal combustion of powder mixes of composition 24, 37 <span class="hlt">Al</span>+ 50, 36 Fe + 25, 27 Si in mass reveals production of several binary and ternary intermetallic phases such: A113Fe4 and <span class="hlt">Al</span>8Fe2Si.. Synthesis conditions were optimized to fabricate these phases having many potential applications.</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.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.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3423946','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3423946"><span id="translatedtitle"><span class="hlt">ALS</span> and Frontotemporal Dysfunction: A Review</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Achi, Eugene Y.; Rudnicki, Stacy A.</p> <p>2012-01-01</p> <p>Though once believed to be a disease that was limited to the motor system, it is now apparent that amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) may be associated with cognitive changes in some patients. Changes are consistent with frontotemporal dysfunction, and may range from mild abnormalities only recognized with formal neuropsychological testing, to profound frontotemporal dementia (FTD). Executive function, behavior, and language are the most likely areas to be involved. Screening helpful in detecting abnormalities includes verbal or categorical fluency, behavioral inventories filled out by the caregiver, and evaluation for the presence of depression and pseudobulbar affect. Patients with cognitive dysfunction have shortened survival and may be less compliant with recommendations regarding use of feeding tubes and noninvasive ventilation. Evolving knowledge of genetic and pathological links between <span class="hlt">ALS</span> and FTD has allowed us to better understand the overlapping spectrum of <span class="hlt">ALS</span> and FTD. PMID:22919484</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3639398','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3639398"><span id="translatedtitle">Stress granules as crucibles of <span class="hlt">ALS</span> pathogenesis</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>King, Oliver D.</p> <p>2013-01-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is a fatal human neurodegenerative disease affecting primarily motor neurons. Two RNA-binding proteins, TDP-43 and FUS, aggregate in the degenerating motor neurons of <span class="hlt">ALS</span> patients, and mutations in the genes encoding these proteins cause some forms of <span class="hlt">ALS</span>. TDP-43 and FUS and several related RNA-binding proteins harbor aggregation-promoting prion-like domains that allow them to rapidly self-associate. This property is critical for the formation and dynamics of cellular ribonucleoprotein granules, the crucibles of RNA metabolism and homeostasis. Recent work connecting TDP-43 and FUS to stress granules has suggested how this cellular pathway, which involves protein aggregation as part of its normal function, might be coopted during disease pathogenesis. PMID:23629963</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007APS..SHK.Q2002H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007APS..SHK.Q2002H"><span id="translatedtitle">Frictional interactions at compressed <span class="hlt">Al</span> interfaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hammerberg, J. E.; Ravelo, R.; Germann, T. C.; Holian, B. L.</p> <p>2007-06-01</p> <p>We discuss the velocity and temperature dependence of the frictional force at sliding <span class="hlt">Al-Al</span> interfaces. A series of 3-D 1.5 million atom Non Equilibrium Molecular Dynamics (NEMD) simulations for single crystal <span class="hlt">Al</span> incommensurate interfaces have been carried out for a range of imposed boundary temperatures and sliding velocities at an imposed boundary pressure of 15 GPa in the solid state. Velocities in the range 50-2000 m/s are considered for temperatures of 232, 464, and 696 K. We discuss the regimes of interfacial stability, from stable, anharmonic phonon dominated at low velocities, through plasticity dominated interfacial instability at intermediate velocities, to high velocity Couette flow, and present a scaled model for the frictional force in the intermediate to high velocity regimes. Connection will be made to recent dynamic friction experiments carried out at the DOE ATLAS pulsed power facility.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007AIPC..955..309H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007AIPC..955..309H"><span id="translatedtitle">Frictional Interactions at Compressed <span class="hlt">al</span> Interfaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hammerberg, J. E.; Ravelo, R.; Germann, T. C.; Holian, B. L.</p> <p>2007-12-01</p> <p>We discuss the velocity and temperature dependence of the frictional force at sliding <span class="hlt">Al-Al</span> interfaces. A series of 3-D 1.4 million atom Non Equilibrium Molecular Dynamics (NEMD) simulations for single crystal <span class="hlt">Al</span> incommensurate interfaces have been carried out for a range of imposed boundary temperatures and sliding velocities at an imposed boundary pressure of 15 GPa in the solid state. Velocities in the range 50-3000 m/s are considered for temperatures of 232, 464, and 696 °K. We discuss the regimes of interfacial stability, from stable anharmonic phonon dominated at low velocities, through plasticity dominated interfacial instability at intermediate velocities, to high velocity Couette flow, and present a scaled model for the frictional force in the intermediate to high velocity regimes.</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.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> </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://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://adsabs.harvard.edu/abs/1986JMMM...54..473L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1986JMMM...54..473L"><span id="translatedtitle">Magnetic properties of Tb<span class="hlt">Al</span> 2 and Er<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>Leson, A.; Schelp, W.; Drewes, W.; Purwins, H.-G.</p> <p>1986-02-01</p> <p>Magnetization measurements parallel and perpendicular to the applied field are reported for single crystals of Tb<span class="hlt">Al</span> 2 and Er<span class="hlt">Al</span> 2. In addition the low temperature specific heat for different magnetic fields has been determined. The results are interpreted using a cubic crystalline field and a molecular field approximation for the exchange interaction.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003JPCM...15.8103L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003JPCM...15.8103L"><span id="translatedtitle">Adhesion of metal carbide/nitride interfaces: <span class="hlt">Al</span>/TiC and <span class="hlt">Al</span>/TiN</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, L. M.; Wang, S. Q.; Ye, H. Q.</p> <p>2003-12-01</p> <p>We employ density functional theory to investigate and compare <span class="hlt">Al</span>/TiC and <span class="hlt">Al</span>/TiN interfaces by electronic structures, relaxed atomic geometries and adhesions. The results show that the preferred bonding site is the interfacial <span class="hlt">Al</span> atoms above the ceramic's metalloid atoms for both systems. The calculated adhesion energies are quantitatively in agreement with other calculated and experimental results of <span class="hlt">Al</span> on the carbide and nitride. A detailed comparison of the adhesion energies and relaxed structures shows weaker bonding and less relaxation in the <span class="hlt">Al</span>/nitride case, which is correlated with the lower surface energy of the ceramic. We have thoroughly characterized the electronic structure and determined that the polar covalent <span class="hlt">Al</span>3sp-C(N)2s bonds constitute the primary interfacial bonding interaction. The larger overlapping bonding states at the <span class="hlt">Al</span>/TiC interface reveal the reason why it exhibits relatively larger adhesion energy. Cleavage may take place preferentially at the interface, especially for the <span class="hlt">Al</span>/TiN, which is in agreement with experimental results.</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://eric.ed.gov/?q=cho&pg=4&id=EJ689425','ERIC'); return false;" href="http://eric.ed.gov/?q=cho&pg=4&id=EJ689425"><span id="translatedtitle">An Alternative Perspective on von Winterfeldt et <span class="hlt">al.'s</span> (1997) Test of Consequence Monotonicity</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>Ho, Moon-Ho R.; Regenwetter, Michel; Niederee, Reinhard; Heyer, Dieter</p> <p>2005-01-01</p> <p>D. von Winterfeldt, N.-K. Chung, R. D. Luce, and Y. Cho (see record 1997-03378-008) provided several tests for consequence monotonicity of choice or judgment, using certainty equivalents of gambles. The authors reaxiomatized consequence monotonicity in a probabilistic framework and reanalyzed von Winterfeldt et <span class="hlt">al.'s</span> main experiment via a…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=reason+NOT+buying+AND+original+AND+goods&pg=7&id=EJ821622','ERIC'); return false;" href="http://eric.ed.gov/?q=reason+NOT+buying+AND+original+AND+goods&pg=7&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://adsabs.harvard.edu/abs/2005JTST...14..264K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005JTST...14..264K"><span id="translatedtitle"><span class="hlt">Al</span>-rich precipitation in CoNiCr<span class="hlt">Al</span>Y bondcoat at high temperature</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Koomparkping, T.; Damrongrat, S.; Niranatlumpong, P.</p> <p>2005-06-01</p> <p>A thermal barrier coating (TBC) is applied on a surface of a gas turbine blade to provide a thermal barrier and oxidation resistant properties for the components. The ability to resist oxidation of the coating arises from the self-healing, protective <span class="hlt">Al</span>2O3 scale on top of the bondcoat, which is formed during service. However, if <span class="hlt">Al</span> depletion occurs within the bondcoat, the protective scale will lose its self-healing ability, and hence, its oxidation-resistant property. This paper investigated the depletion of <span class="hlt">Al</span> within the bondcoat by studying the microstructure of the bondcoat on a gas turbine blade after it has been in 4000 h service at 1200 °C. The results showed that <span class="hlt">Al</span> depletion had occurred at different levels throughout the turbine blade. In the area where <span class="hlt">Al</span> depletion had not yet occurred, precipitation of an <span class="hlt">Al</span>-rich phase was detected. Most of the <span class="hlt">Al</span> was contained within this phase, leaving only small amount of <span class="hlt">Al</span> in the surrounding matrix. A well-defined boundary was observed between the depleted and non-depleted regions.</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://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/biblio/21013666','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21013666"><span id="translatedtitle">Intersubband absorption in <span class="hlt">AlN/GaN/Al</span>GaN coupled quantum wells</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Driscoll, Kristina; Bhattacharyya, Anirban; Moustakas, Theodore D.; Paiella, Roberto; Zhou, Lin; Smith, David J.</p> <p>2007-10-01</p> <p><span class="hlt">AlN/GaN/Al</span>GaN coupled quantum wells grown by molecular beam epitaxy have been developed and characterized via intersubband absorption spectroscopy. In these structures, an <span class="hlt">Al</span>GaN layer of sufficiently low <span class="hlt">Al</span> content is used to achieve strong interwell coupling without the need for ultrathin inner barriers. At the same time, <span class="hlt">Al</span>N is used in the outer barriers to provide the large quantum confinement required for near-infrared intersubband transitions. The composition of the inner barriers also provides a continuously tunable parameter to control the coupling strength. Double intersubband absorption peaks are measured in each sample, at photon energies in good agreement with theoretical expectations.</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://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://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/2014ApPhL.105x1908H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014ApPhL.105x1908H"><span id="translatedtitle">Alloy inhomogeneity and carrier localization in <span class="hlt">Al</span>GaN sections and <span class="hlt">AlGaN/Al</span>N nanodisks in nanowires with 240-350 nm emission</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Himwas, C.; den Hertog, M.; Dang, Le Si; Monroy, E.; Songmuang, R.</p> <p>2014-12-01</p> <p>We present structural and optical studies of <span class="hlt">Al</span>GaN sections and <span class="hlt">AlGaN/Al</span>N nanodisks (NDs) in nanowires grown by plasma-assisted molecular beam epitaxy. The <span class="hlt">Al</span>-Ga intermixing at <span class="hlt">Al</span>(Ga)N/GaN interfaces and the chemical inhomogeneity in <span class="hlt">Al</span>GaN NDs evidenced by scanning transmission electron microscopy are attributed to the strain relaxation process. This interpretation is supported by the three-dimensional strain distribution calculated by minimizing the elastic energy in the structure. The alloy inhomogeneity increases with the <span class="hlt">Al</span> content, leading to enhanced carrier localization signatures in the luminescence characteristics, i.e., red shift of the emission, s-shaped temperature dependence, and linewidth broadening. Despite these effects, the emission energy of <span class="hlt">AlGaN/Al</span>N NDs can be tuned in the 240-350 nm range with internal quantum efficiencies around 30%.</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> <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://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/2016APExp...9e1001H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016APExp...9e1001H"><span id="translatedtitle">Effect of stress on the <span class="hlt">Al</span> composition evolution in <span class="hlt">Al</span>GaN grown using metal organic vapor phase epitaxy</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>He, Chenguang; Qin, Zhixin; Xu, Fujun; Zhang, Lisheng; Wang, Jiaming; Hou, Mengjun; Zhang, Shan; Wang, Xinqiang; Ge, Weikun; Shen, Bo</p> <p>2016-05-01</p> <p>Two series of <span class="hlt">Al</span>GaN samples with different stresses were designed to investigate the effect of stress on the <span class="hlt">Al</span> composition. X-ray diffraction reciprocal space mapping (XRD RSM) demonstrated that the <span class="hlt">Al</span>GaN epilayers with different stresses have large <span class="hlt">Al</span> composition differences despite the same growth conditions. The largest <span class="hlt">Al</span> composition difference reached up to 21.3%, which was also confirmed using secondary ion mass spectroscopy (SIMS). This result is attributed to a large stress discrepancy in the <span class="hlt">Al</span>GaN epilayers. Finally, the dependences of the solid-phase <span class="hlt">Al</span> composition on the gas-phase <span class="hlt">Al</span> composition under different stresses were systematically analyzed.</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://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://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://www.ncbi.nlm.nih.gov/pubmed/11465924','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/11465924"><span id="translatedtitle">Genetics of <span class="hlt">ALS</span> in Italian families.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Gellera, C</p> <p>2001-03-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is a progressive neurodegenerative disorder affecting motor neurons. The majority of the patients are sporadic cases (SALS), while 10-15% of patients has a family history of <span class="hlt">ALS</span> (familial <span class="hlt">ALS</span> or FALS). Mutations in the gene coding for cytoplasmic Cu/Zn superoxide dismutase (SOD1) have been identified in 20% of FALS. We found SOD1-gene mutations in 7 of 36 unrelated FALS and in 3 of 48 SALS patients. Four FALS patients carried previously described mutations, the A4V (2 cases), the L84F mutations (1 case), and the G93D (1 case), while three FALS patients carried new missense mutations: the G12R mutation, the F45C mutation and the V47F mutation, respectively. Two SALS patients carried previously reported mutations: the homozygous D90A and the heterozygous I113T mutation, respectively. In addition, in one SALS patient we identified an apparently non-pathogenic SOD1 variant: the A95T mutation. Our study contributes to expand the number of <span class="hlt">ALS</span>-associated SOD1 gene mutations. PMID:11465924</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=word+AND+lends&pg=5&id=EJ734728','ERIC'); return false;" href="http://eric.ed.gov/?q=word+AND+lends&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-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://www.osti.gov/scitech/biblio/87741','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/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/scitech/servlets/purl/869994','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/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.; Takeya, Hiroyuki</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('https://www.gpo.gov/fdsys/pkg/FR-2013-05-03/pdf/2013-10506.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2013-05-03/pdf/2013-10506.pdf"><span id="translatedtitle">78 FR 26100 - Alabama Disaster #<span class="hlt">AL</span>-00050</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>2013-05-03</p> <p>... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00050 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...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2011-05-10/pdf/2011-11428.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2011-05-10/pdf/2011-11428.pdf"><span id="translatedtitle">76 FR 27141 - Alabama Disaster # <span class="hlt">AL</span>-00036</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>2011-05-10</p> <p>... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00036 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for the State of Alabama...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2010-01-05/pdf/E9-31259.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2010-01-05/pdf/E9-31259.pdf"><span id="translatedtitle">75 FR 474 - Alabama Disaster #<span class="hlt">AL</span>-00026</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>2010-01-05</p> <p>... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00026 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for Public Assistance Only for...</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('https://www.gpo.gov/fdsys/pkg/FR-2011-05-23/pdf/2011-12524.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2011-05-23/pdf/2011-12524.pdf"><span id="translatedtitle">76 FR 29810 - Alabama Disaster #<span class="hlt">AL</span>-00037</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>2011-05-23</p> <p>... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00037 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for Public Assistance Only for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2010-05-12/pdf/2010-11199.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2010-05-12/pdf/2010-11199.pdf"><span id="translatedtitle">75 FR 26813 - Alabama Disaster #<span class="hlt">AL</span>-00029</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>2010-05-12</p> <p>... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00029 AGENCY: Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for the State of Alabama...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2012-10-01/pdf/2012-24147.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2012-10-01/pdf/2012-24147.pdf"><span id="translatedtitle">77 FR 60003 - Alabama Disaster #<span class="hlt">AL</span>-00044</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>2012-10-01</p> <p>... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00044 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for Public Assistance Only for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2010-05-12/pdf/2010-11201.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2010-05-12/pdf/2010-11201.pdf"><span id="translatedtitle">75 FR 26814 - Alabama Disaster #<span class="hlt">AL</span>-00031</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>2010-05-12</p> <p>... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00031 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for Public Assistance Only for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2013-04-15/pdf/2013-08761.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2013-04-15/pdf/2013-08761.pdf"><span id="translatedtitle">78 FR 22361 - Alabama Disaster #<span class="hlt">AL</span>-00049</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>2013-04-15</p> <p>... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00049 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...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2012-02-10/pdf/2012-3083.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2012-02-10/pdf/2012-3083.pdf"><span id="translatedtitle">77 FR 7227 - Alabama Disaster #<span class="hlt">AL</span>-00040</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>2012-02-10</p> <p>... From the Federal Register Online via the Government Publishing Office SMALL BUSINESS ADMINISTRATION Alabama Disaster <span class="hlt">AL</span>-00040 AGENCY: U.S. Small Business Administration. ACTION: Notice. SUMMARY: This is a Notice of the Presidential declaration of a major disaster for the State of Alabama...</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('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('http://eric.ed.gov/?q=morality+AND+education&pg=2&id=EJ775716','ERIC'); return false;" href="http://eric.ed.gov/?q=morality+AND+education&pg=2&id=EJ775716"><span id="translatedtitle"><span class="hlt">Al</span>-Ghazali on Moral Education</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>Alavi, Hamid Reza</p> <p>2007-01-01</p> <p><span class="hlt">Al</span>-Ghazali (1058-1111 CE) is probably the most influential scholar, philosopher, theologian, legal expert, religious reformer and mystic in the history of Islam. Although he wrote extensively about education, and particularly about moral education, this writing is scattered through a number of different works and has received less scholarly…</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://adsabs.harvard.edu/abs/2016APS..MARF19012G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016APS..MARF19012G"><span id="translatedtitle">Quantum Criticality in YFe2<span class="hlt">Al</span>10</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gannon, William; Wu, Liusuo; Zaliznyak, Igor; Qiu, Yiming; Rodriguez-Rivera, Jose; Aronson, Meigan</p> <p></p> <p>Quantum criticality has been studied in many systems, but there are few systems where observed scaling can be unified with a critical free energy F, or where the critical exponents form the basis for QC universality classes. We have identified a new layered material YFe2<span class="hlt">Al</span>10 that shows remarkably strong QC behavior, where the scaling properties of the magnetic susceptibility and specific heat are consistent with the same F. Recent neutron scattering results paint a remarkable picture of the QC fluctuations in YFe2<span class="hlt">Al</span>10. In contrast to classical transitions, where fluctuations are relatively long ranged and inelastic scattering is observed at a magnetic zone center, in YFe2<span class="hlt">Al</span>10 the scattering is independent of wave vector in the critical plane, indicating that the fluctuations are spatially localized, while out of plane scattering indicates that the interplaner interactions are restricted to nearest neighbors. The dynamical susceptibility χ'' ~=E-2 , and is wholly temperature independent, indicating that E/T scaling is present, the signature of QC fluctuations. These results hint that the the criticality in YFe2<span class="hlt">Al</span>10 is local, which until now has only been found in a few f-electron based compounds.</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/23030513','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23030513"><span id="translatedtitle">Clinical epidemiology of <span class="hlt">ALS</span> in Liguria, Italy.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bandettini di Poggio, Monica; Sormani, Maria Pia; Truffelli, Romina; Mandich, Paola; Origone, Paola; Verdiani, Simonetta; Mantero, Vittorio; Scialò, Carlo; Schenone, Angelo; Mancardi, Giovanni Luigi; Caponnetto, Claudia</p> <p>2013-01-01</p> <p>Our objective was to assess the incidence and trends of amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) in Liguria, a north-west region of Italy, utilizing a prospective design. Liguria (1,615,064 residents in 2010) is the site of a multicentre-multisource prospective population based registry called LIGALS (Liguria Amyotrophic Lateral Sclerosis Registry). All incident <span class="hlt">ALS</span> cases during the period 2009-2010 were enrolled and followed up. Cases were identified using several concurrent sources. <span class="hlt">ALS</span> diagnosis was based on the revised El Escorial criteria. One hundred and four cases were enrolled, generating an annual crude incidence of 3.22/100,000 (95% CI 2.66-3.90), with a male/female ratio of 1.34. The annual standardized incidence, age and gender adjusted to the 2001 Italian population, was 2.51. At last observation on 1 March 2012, 45% of patients registered in the LIGALS had died, with a median survival of 45 months from symptoms onset. According to capture-recapture estimation, three patients were unobserved. For both genders, demographic and clinical features were collected. In conclusion, comparing these data to those of epidemiological studies with a similar prospective design, the occurrence of <span class="hlt">ALS</span> is similar. The observed crude incidence was higher compared to other Italian studies, due in part to a very careful case ascertainment and in part to a high percentage of the elderly in Liguria. PMID:23030513</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1994HyInt..83..327M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1994HyInt..83..327M"><span id="translatedtitle">Thermal mixing of <span class="hlt">Al</span>-Fe multilayers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Meyer, M.; Mendoza Zélis, L.; Sánchez, F. H.; Traverse, A.</p> <p>1994-12-01</p> <p><span class="hlt">Al</span>-Fe multilayers have been mixed by thermal treatment and their evolution followed by conversion electron Mössbauer spectroscopy. The initial and final states have been characterized by Rutherford backscattering spectrometry. The results are compared with those previously obtained in the ion beam mixing of similar systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=track+AND+field&pg=7&id=EJ1019783','ERIC'); return false;" href="http://eric.ed.gov/?q=track+AND+field&pg=7&id=EJ1019783"><span id="translatedtitle">Hughes et <span class="hlt">al</span>.: Science or Promotion?</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>Loman, L. Anthony; Siegel, Gary L.</p> <p>2013-01-01</p> <p>The Hughes et <span class="hlt">al</span>. paper is critiqued generally and in specific areas. The weak nature of the authors' empirical work is discussed along with their enigmatic writing and vague and incorrect use of references, and their simultaneous use of sweeping statements of opinion and narrow analytical focus. This review examines the authors' errors…</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/2014JNuM..452..197L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JNuM..452..197L"><span id="translatedtitle">Electrochemical formation of <span class="hlt">Al</span>-Tm intermetallics in eutectic LiCl-KCl melt containing Tm and <span class="hlt">Al</span> ions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Xing; Yan, Yong-De; Zhang, Mi-Lin; Tang, Hao; Ji, De-Bin; Han, Wei; Xue, Yun; Zhang, Zhi-Jian</p> <p>2014-09-01</p> <p>This work focuses on investigating the electrochemical formation of <span class="hlt">Al</span>-Tm and <span class="hlt">Al</span>-Li-Tm alloys in LiCl-KCl-<span class="hlt">Al</span>Cl3-Tm2O3 melt on both W and <span class="hlt">Al</span> electrodes. Thermodynamic calculation and electrochemical behavior of LiCl-KCl melt containing both <span class="hlt">Al</span>Cl3 and Tm2O3 showed that <span class="hlt">Al</span>Cl3 can chlorinate Tm2O3 to release Tm(III) ions. Three kinds of <span class="hlt">Al</span>-Tm intermetallics at about -1.26, -1.32 and -1.43 V were detected by means of various electrochemical measurement techniques, i.e. cyclic voltammetry, square wave voltammetry and open circuit chronopotentiometry. Potentiostatic and galvanostatic electrolysis were carried out on <span class="hlt">Al</span> and W electrodes to prepare <span class="hlt">Al</span>-Tm and <span class="hlt">Al</span>-Li-Tm alloys, respectively. The composition of <span class="hlt">Al</span>-Li-Tm alloys was analyzed by inductive coupled plasma atomic emission spectrometer (ICP-AES).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014ApSS..317..140C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014ApSS..317..140C"><span id="translatedtitle">Wetting of polycrystalline SiC by molten <span class="hlt">Al</span> and <span class="hlt">Al</span>-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>Cong, Xiao-Shuang; Shen, Ping; Wang, Yi; Jiang, Qichuan</p> <p>2014-10-01</p> <p>The wetting of α-SiC by molten <span class="hlt">Al</span> and <span class="hlt">Al</span>-Si alloys was investigated using a dispensed sessile drop method in a high vacuum. In the <span class="hlt">Al</span>-SiC system, representative wetting stages were identified. The liquid spreading was initially controlled by the deoxidation of the SiC surface and then by the formation of <span class="hlt">Al</span>4C3 at the interface. The intrinsic contact angle for molten <span class="hlt">Al</span> on the polycrystalline α-SiC surface was suggested to be lower than 90̊ provided that the oxide films covering the <span class="hlt">Al</span> and SiC surfaces were removed, i.e., the system is partial wetting in nature. An increase in the Si concentration in liquid <span class="hlt">Al</span> weakened the interfacial reaction but improved the final wettability. The role of the Si addition on the wetting was presumably attributed to its segregation at the interface and the formation of strong chemical bonds with the SiC surface.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/19237777','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/19237777"><span id="translatedtitle">Effect of speciation transformation on the coagulation behavior of <span class="hlt">Al</span>(13) and <span class="hlt">Al</span>(13) aggregates.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wu, Xiaohong; Ye, Changqing; Wang, Dongsheng; Ge, Xiaopeng; Tang, Hongxiao</p> <p>2009-01-01</p> <p>Flocculation of kaolin suspension with aluminium fractal polycations was investigated as a function of aluminium concentration and pH. Aluminium flocculants included <span class="hlt">Al</span>(13) and <span class="hlt">Al</span>(13) aggregates with OH/<span class="hlt">Al</span> ratio of 2.6 and 2.8, respectively. The flocculation kinetics and floc size distribution were monitored by light scattering. The characterization of flocculants showed that the tridecatmer <span class="hlt">Al</span>(13) and bridged [<span class="hlt">Al</span>(13)](n) with out-sphere structure were the dominant species for all flocculants in a wide pH range. The coagulation results indicated that the pre and in situ-formed [<span class="hlt">Al</span>(13)](n) play a key role in removing particles. With the increasing concentration of [<span class="hlt">Al</span>(13)](n), coagulation mechanisms were transformed from charge-neutralization, electro-patch coagulation to bridge-aggregation. Moreover, sweep-flocculation was involved at higher dosage besides other three mechanisms when amorphous aluminium oxides formed. Hence, chemical interaction between particles and flocculants evolved from surface adsorption to surface precipitation for aluminium polycations by virtue of species transformation. PMID:19237777</p> </li> <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/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://www.ncbi.nlm.nih.gov/pubmed/21880027','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/21880027"><span id="translatedtitle">An <span class="hlt">Al</span>-inducible MATE gene is involved in external detoxification of <span class="hlt">Al</span> in rice.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Yokosho, Kengo; Yamaji, Naoki; Ma, Jian Feng</p> <p>2011-12-01</p> <p>A number of plant species, including rice, secretes citrate from roots in response to <span class="hlt">Al</span> stress. Here we characterized the functions of a gene, OsFRDL4 (Os01g0919100) that belongs to the multidrug and toxic compound extrusion (MATE) family in rice (Oryza sativa). Heterologous expression in Xenopus oocyte showed that the OsFRDL4 protein was able to transport citrate and was activated by <span class="hlt">Al</span>. The expression level of the OsFRDL4 gene in roots was very low in the absence of <span class="hlt">Al</span>, but was greatly enhanced by <span class="hlt">Al</span> after short exposure. Furthermore, the OsFRDL4 expression was regulated by ART1, a C2H2-type zinc finger transcription factor for <span class="hlt">Al</span> tolerance. Transient expression of OsFRDL4 in onion epidermal cells showed that it localized to the plasma membrane. Immunostaining showed that OsFRDL4 was localized in all cells in the root tip. These expression patterns and cell specificity of localization of OsFRDL4 are different from other MATE members identified previously. Knockout of OsFRDL4 resulted in decreased <span class="hlt">Al</span> tolerance and decreased citrate secretion compared with the wild-type rice, but did not affect citrate concentration in the xylem sap. Furthermore, there is a positive correlation between OsFRDL4 expression level and the amount of citrate secretion in rice cultivars that are differing in <span class="hlt">Al</span> tolerance. Taken together, our results show that OsFRDL4 is an <span class="hlt">Al</span>-induced citrate transporter localized at the plasma membrane of rice root cells and is one of the components of high <span class="hlt">Al</span> tolerance in rice. PMID:21880027</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://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; Mller, 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://www.osti.gov/scitech/biblio/7286075','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/7286075"><span id="translatedtitle">Calculation of the structure of the <span class="hlt">Al</span>(331) stepped surface</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Nelson, J.S.; Feibelman, P.J. )</p> <p>1992-04-06</p> <p>Car-Parinello-like calculations have been used to compute the relaxation of the <span class="hlt">Al</span>(331) surface, with results that are in remarkable agreement with the low-energy electron-diffraction analysis of Adams and So( )renson. Rapid screening of the steps on <span class="hlt">Al</span>(331) is illustrated by comparing its charge density and relaxations to those of <span class="hlt">Al</span>(110) and <span class="hlt">Al</span>(111).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009MMTA...40.2919K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009MMTA...40.2919K"><span id="translatedtitle">Diffusion of Au in the Intermetallic Compound Ti3<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>Koizumi, Y.; Tanaka, T.; Minamino, Y.</p> <p>2009-12-01</p> <p>The Au diffusion in the Ti3<span class="hlt">Al</span> compound was investigated at six compositions from 25 to 35 at. pct <span class="hlt">Al</span> by using the diffusion couples (Ti- X at. pct <span class="hlt">Al</span>/Ti- X at. pct <span class="hlt">Al</span>-2 at. pct Au; X = 25, 27, 29, 31, 32, and 35) at 1273 to 1423 K. The diffusion coefficients of Au in Ti3<span class="hlt">Al</span> left( {D_{text{Au}}^{{{text{Ti}}3 {text{<span class="hlt">Al</span>}}}} } right) are relatively close to those of Ti. The {D}_{text{Au}}^{{{text{Ti}}3 {text{<span class="hlt">Al</span>}}}} {text{s}} slightly increase with <span class="hlt">Al</span> concentration within the same order of magnitude. The activation energies of Au diffusion, Q_{text{Au}}^{{{text{Ti}}3 {text{<span class="hlt">Al</span>}}}} {text{s}}, evaluated from the Arrhenius plots were relatively close to those of Ti diffusion, Q_{text{Ti}}^{{{text{Ti}}3 {text{<span class="hlt">Al</span>}}}} {text{s}}, rather than those of <span class="hlt">Al</span> diffusion, {Q}_{text{<span class="hlt">Al</span>}}^{{{text{Ti}}3 {text{<span class="hlt">Al</span>}}}} {text{s}}; therefore, it was suggested that Au atoms diffuse by the sublattice diffusion mechanism in which Au atoms substitute for Ti sites preferentially in Ti3<span class="hlt">Al</span> and diffuse by vacancy mechanism on Ti sublattice. The influence of the D019 ordered structure (hcp base) of Ti3<span class="hlt">Al</span> on diffusion of Au and other elements is discussed by comparing the diffusivities in Ti3<span class="hlt">Al</span> and α-Ti.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27123890','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27123890"><span id="translatedtitle">Announcement: Amyotrophic Lateral Sclerosis (<span class="hlt">ALS</span>) Awareness Month - May 2016.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p></p> <p>2016-01-01</p> <p>May is Amyotrophic Lateral Sclerosis (<span class="hlt">ALS</span>) Awareness Month. <span class="hlt">ALS</span>, also known as Lou Gehrig's disease, is a progressive, fatal, neurodegenerative disorder of upper and lower motor neurons. The cause of <span class="hlt">ALS</span> is not known, and no cure exists. Persons with <span class="hlt">ALS</span> usually die within 2-5 years of diagnosis. PMID:27123890</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://www.ncbi.nlm.nih.gov/pubmed/25772671','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25772671"><span id="translatedtitle">A 25-year replication of Katz et <span class="hlt">al.'s</span> (1988) metaphor norms.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Campbell, Spencer J; Raney, Gary E</p> <p>2016-03-01</p> <p>Research in metaphor processing has made extensive use of the normed metaphor database created by Katz, Paivio, Marschark, & Clark (Metaphor and Symbolic Activity, 3, 191-214, 1988). Because of the plasticity of figurative language, we conducted a renorming of selected metaphors from the database on a new student population. Correlations between Katz et <span class="hlt">al.'s</span> and the present data showed that the pattern of responses has remained highly consistent across time and populations. The consistency of the normative ratings allows us to be confident in future research that will use the Katz et <span class="hlt">al</span>. collection. PMID:25772671</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://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/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://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.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://www.osti.gov/scitech/biblio/20971833','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20971833"><span id="translatedtitle">Role of Si on the <span class="hlt">Al</span> behavior in the reaction layer of <span class="hlt">Al</span>/UMo diffusion couples</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Garces, Jorge E.; Bozzolo, Guillermo; Hofman, Gerard; Rest, Jeffrey</p> <p>2007-02-12</p> <p>The basic experimental features characterizing the <span class="hlt">Al</span>-Si/U-Mo interface are identified in this atomistic modeling effort, such as the formation of interfacial compounds, Si depletion in the <span class="hlt">Al</span> matrix near the interface, reduced <span class="hlt">Al</span> diffusion in the UMo solid solution, and the interaction between Mo and Si which inhibits <span class="hlt">Al</span> and Si diffusion to the UMo bulk.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/17654976','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/17654976"><span id="translatedtitle">Synthesis and characterization of <span class="hlt">Al-Zn/Al</span>2O3 nano-powder composites.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Durai, T G; Das, Karabi; Das, Siddhartha</p> <p>2007-06-01</p> <p>Composites consisting of <span class="hlt">Al-Zn/Al</span>2O3 have been synthesized using high energy mechanical milling. High energy ball milling increases the sintering rate of the composite powder due to increased diffusion rate. Owing to the finer microstructure, the hardness of the sintered composite produced by using the mechanically milled nanocomposite powder is significantly higher than that of the sintered composite produced by using the as-mixed powder. The mean crystallite size of the matrix has been determined to be 27 nm by Scherrer equation using X-ray diffraction data. The powders have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and differential thermal analysis (DTA). The effect of high-energy ball milling and subsequent annealing on a mixture of <span class="hlt">Al</span> and ZnO has also been investigated. DTA result show that the reaction temperature of <span class="hlt">Al</span>-ZnO decreases with the increase in the ball milling time. PMID:17654976</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/22311190','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22311190"><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://www.osti.gov/scitech">SciTech Connect</a></p> <p>Chouchane, F.; Almuneau, G. Arnoult, A.; Lacoste, G.; Fontaine, C.; Cherkashin, N.</p> <p>2014-07-28</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 <span class="hlt">Al</span>{sub x}Ga{sub 1−x}As/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=19720050230&hterms=Rechargeable+Batteries&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DRechargeable%2BBatteries','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19720050230&hterms=Rechargeable+Batteries&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DRechargeable%2BBatteries"><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/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=19930070119&hterms=fgm+materials&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dfgm%2Bmaterials','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19930070119&hterms=fgm+materials&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dfgm%2Bmaterials"><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/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://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/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> <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.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3096454','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3096454"><span id="translatedtitle">Communication Support for People with <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>Beukelman, David; Fager, Susan; Nordness, Amy</p> <p>2011-01-01</p> <p>Almost all people with amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) experience a motor speech disorder, such as dysarthria, as the disease progresses. At some point, 80 to 95% of people with <span class="hlt">ALS</span> are unable to meet their daily communication needs using natural speech. Unfortunately, once intelligibility begins to decrease, speech performance often deteriorates so rapidly that there is little time to implement an appropriate augmentative and alternative communication (AAC) intervention; therefore, appropriate timing of referral for AAC assessment and intervention continues to be a most important clinical decision-making issue. AAC acceptance and use have increased considerably during the past decade. Many people use AAC until within a few weeks of their deaths. PMID:21603029</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://www.osti.gov/scitech/servlets/purl/10179461','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10179461"><span id="translatedtitle">Forging of Fe<span class="hlt">Al</span> intermetallic compounds</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Flores, O.; Juarez, J.; Campillo, B.; Martinez, L.; Schneibel, J.H.</p> <p>1994-09-01</p> <p>Much activity has been concentrated on the development of intermetallic compounds with the aim of improving tensile ductility, fracture toughness and high notch sensitivity in order to develop an attractive combination of properties for high and low temperature applications. This paper reports experience in processing and forging of Fe<span class="hlt">Al</span> intermetallic of B2 type. During the experiments two different temperatures were employed, and the specimens were forged after annealing in air, 10{sup {minus}2} torr vacuum and argon. From the results it was learned that annealing Fe<span class="hlt">Al</span> in argon atmosphere prior to forging resulted in better deformation behavior than for the other two environments. For the higher forging temperature used in the experiments (700C), the as-cast microstructure becomes partially recrystallized.</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> </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.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>Chdru, 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://www.ncbi.nlm.nih.gov/pubmed/27232539','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27232539"><span id="translatedtitle">Characterization of <span class="hlt">Al</span>30 in commercial poly-aluminum chlorohydrate by solid-state (27)<span class="hlt">Al</span> NMR spectroscopy.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Phillips, Brian L; Vaughn, John S; Smart, Scott; Pan, Long</p> <p>2016-08-15</p> <p>Investigation of commercially produced hydrolysis salts of aluminum by solid-state (27)<span class="hlt">Al</span> NMR spectroscopy and size-exclusion chromatography (SEC) reveals well-defined and distinct <span class="hlt">Al</span> environments that can be related to physicochemical properties. (27)<span class="hlt">Al</span> MAS and MQ-MAS NMR spectroscopic data show that the local structure of the solids is dominated by moieties that closely resemble the <span class="hlt">Al</span>30 polyoxocation (<span class="hlt">Al</span>30O8(OH)56(H2O)26(18+)), accounting for 72-85% of the total <span class="hlt">Al</span>. These <span class="hlt">Al</span>30-like clusters elute as several size fractions by SEC. Comparison of the SEC and NMR results indicates that the <span class="hlt">Al</span>30-like clusters includes intact isolated clusters, moieties of larger polymers or aggregates, and possibly fragments resembling δ-<span class="hlt">Al</span>13 Keggin clusters. The coagulation efficacy of the solids appears to correlate best with the abundance of intact <span class="hlt">Al</span>30-like clusters and of smaller species available to promote condensation reactions. PMID:27232539</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://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/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.ncbi.nlm.nih.gov/pubmed/27046810','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27046810"><span id="translatedtitle">Response to de la Iglesia et <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>Yetish, Gandhi; Kaplan, Hillard; Gurven, Michael; Wood, Brian; Pontzer, Herman; Manger, Paul R; Wilson, Charles; McGregor, Ronald; Siegel, Jerome M</p> <p>2016-04-01</p> <p>We wish to respond to the commentary of de la Iglesia et <span class="hlt">al</span>. [1]. Studies comparing sleep in different communities have different goals. One frequent goal has been to determine how sleep is affected by manipulating specific 'modern' conditions. Many studies have investigated the effect of artificial light and electronic entertainment. Such studies have clearly shown that light, particularly blue light, delays sleep onset [2]. Studying the effect of artificial light on sleep was not a goal of our study. PMID:27046810</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/16923240','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/16923240"><span id="translatedtitle">Diet and dietetics in <span class="hlt">al</span>-Andalus.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Salas-Salvadó, Jordi; Huetos-Solano, Maria D; García-Lorda, Pilar; Bulló, Mònica</p> <p>2006-08-01</p> <p><span class="hlt">Al</span>-Andalus society (711-1492) based its idea of health on the wisdom of Classical Greece, the Hippocratic-Galenic theories, as well as the Persian and Hindu cultures. The twelfth century in <span class="hlt">al</span>-Andalus is considered to be the most prolific period for works of a scientific and technical nature. At the time, the main treatises on dietetics were written and this science reached its widest expression with such leading figures as Ibn Wāfīd, Avenzoar, Averroes and Maimonides, whose works revealed the first scientific knowledge on the nutritional processes of the human body. Diet was regarded as being essential for health and the prevention of disease. Dietary guidelines were written for different age groups, different body types and different seasons of the year. The amount of food to be ingested, the number of meals recommended and the order in which the food should be consumed were all issues that were discussed. A variety of foods were thought to have medicinal properties, some of which are known today. The diet in <span class="hlt">al</span>-Andalus was varied and very probably made a substantial contribution to the origin of the present-day Mediterranean diet, rich in olive oil, wholemeal cereals, fruit and vegetables, fish, lamb, poultry, nuts and spices. We also find that many of the terms in current use in diet and agriculture are a living testimony to the Arabic influence, as are many of the dishes of our varied Mediterranean gastronomy. PMID:16923240</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3515205','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3515205"><span id="translatedtitle">Prognostic factors in <span class="hlt">ALS</span>: A critical review</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Chio, Adriano; Logroscino, Giancarlo; Hardiman, Orla; Swingler, Robert; Mitchell, Douglas; Beghi, Ettore; Traynor, Bryan G.</p> <p>2012-01-01</p> <p>We have performed a systematic review to summarize current knowledge concerning factors related to survival in <span class="hlt">ALS</span> and to evaluate the implications of these data for clinical trials design. The median survival time from onset to death ranges from 20 to 48 months, but 10–20% of <span class="hlt">ALS</span> patients have a survival longer than 10 years. Older age and bulbar onset are consistently reported to have a worse outcome. There are conflicting data on gender, diagnostic delay and El Escorial criteria. The rate of symptom progression was revealed to be an independent prognostic factor. Psychosocial factors, FTD, nutritional status, and respiratory function are also related to <span class="hlt">ALS</span> outcome. The effect of enteral nutrition on survival is still unclear, while NIPPV has been found to improve survival. There are no well established biological markers of progression, although some are likely to emerge in the near future. These findings have relevant implications for the design of future trials. Randomization, besides the type of onset, should take into account age, respiratory status at entry, and a measure of disease progression pre-entry. Alternative trial designs can include the use of natural history controls, the so-called minimization method for treatment allocation, and the futility approach. PMID:19922118</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> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21137056','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21137056"><span id="translatedtitle">Devitrification of <span class="hlt">Al</span>-Y-Ni Glasses</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Vasiliev, A. L.; Aindow, M.</p> <p>2008-04-10</p> <p>Crystallization of gas-atomized <span class="hlt">Al</span>-4.3Y-3.8Ni alloy powder during consolidation has been studied ex-situ in a transmission electron microscope using high-resolution lattice imaging together with the image simulations, selected-area diffraction and energy-dispersive X-ray spectrometry experiments. The as-atomized powder is predominantly amorphous but some particles others show evidence of decomposition. On the application of heat and pressure two types of decomposition product are formed initially; equiaxed nanoscale {alpha}-<span class="hlt">Al</span> grains embedded in an amorphous matrix, and dendritic aluminum grains containing complex ordered structures. The ordered structures in the {alpha}-<span class="hlt">Al</span> were identified as Guinier-Preston like zones: thin sheets of solute rich material parallel to {l_brace}100{r_brace} and {l_brace}110{r_brace} aluminum planes with ordered cubic symmetry. Amorphous and micro-crystalline phases are in between the aluminum-rich regions. The second and third stages of crystallization involve the conversion of these ordered phases and embryonic precipitates to the better-known binary and ternary compounds.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008AIPC..999..257V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008AIPC..999..257V"><span id="translatedtitle">Devitrification of <span class="hlt">Al</span>-Y-Ni Glasses</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Vasiliev, A. L.; Aindow, M.</p> <p>2008-04-01</p> <p>Crystallization of gas-atomized <span class="hlt">Al</span>-4.3Y-3.8Ni alloy powder during consolidation has been studied ex-situ in a transmission electron microscope using high-resolution lattice imaging together with the image simulations, selected-area diffraction and energy-dispersive X-ray spectrometry experiments. The as-atomized powder is predominantly amorphous but some particles others show evidence of decomposition. On the application of heat and pressure two types of decomposition product are formed initially; equiaxed nanoscale α-<span class="hlt">Al</span> grains embedded in an amorphous matrix, and dendritic aluminum grains containing complex ordered structures. The ordered structures in the α-<span class="hlt">Al</span> were identified as Guinier-Preston like zones: thin sheets of solute rich material parallel to {100} and {110} aluminum planes with ordered cubic symmetry. Amorphous and micro-crystalline phases are in between the aluminum-rich regions. The second and third stages of crystallization involve the conversion of these ordered phases and embryonic precipitates to the better-known binary and ternary compounds.</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://www.ncbi.nlm.nih.gov/pubmed/23109893','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23109893"><span id="translatedtitle">Room temperature radiolytic synthesized Cu@Cu<span class="hlt">Al</span>O(2)-<span class="hlt">Al</span>(2)O(3) nanoparticles.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</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>O(2)-<span class="hlt">Al</span>(2)O(3) 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 (60)Co gamma source chamber with different doses up to 120 kGy. The formation of Cu@Cu<span class="hlt">Al</span>O(2)-<span class="hlt">Al</span>(2)O(3) 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>O(2)-<span class="hlt">Al</span>(2)O(3) 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://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/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, γ → α 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://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>Kovcs, Zs.; Kvr, L.; Weightman, P.; Varga, D.; Sanjins, R.; Plinks, 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/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 μm 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://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> </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://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/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://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/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://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://adsabs.harvard.edu/abs/2015RuMet2015...51B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015RuMet2015...51B"><span id="translatedtitle">Effect of the composition of <span class="hlt">Al</span>-Li alloys on the quantitative relation between the δ'(<span class="hlt">Al</span>3Li), S1(<span class="hlt">Al</span>2MgLi), and T1(<span class="hlt">Al</span>2CuLi) phases</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Betsofen, S. Ya.; Antipov, V. V.; Grushin, I. A.; Knyazev, M. I.; Khokhlatova, L. B.; Alekseev, A. A.</p> <p>2015-01-01</p> <p><span class="hlt">Al</span>-Li alloys are considered. A quantitative approach to the determination of the ratio of the fractions of the binary and ternary intermetallic phases in <span class="hlt">Al</span>-Mg(Cu)-Li alloys is developed on the basis of chemical and phase composition balance equations and the experimentally measured lattice parameter of the α solid solution. The ratio of the fractions of the δ'(<span class="hlt">Al</span>3Li) and S1(T1) phases in <span class="hlt">Al</span>-Mg(Cu)-Li alloys is shown to be determined by the ratio of the mole fractions of Li and Mg(Cu). Equations are proposed for calculating the weight fractions of the S1(<span class="hlt">Al</span>2MgLi), T1(<span class="hlt">Al</span>2CuLi) and δ'(<span class="hlt">Al</span>3Li) phases in domestic and foreign <span class="hlt">Al</span>-Mg-Li alloys 1420, 1424, 5090 and <span class="hlt">Al</span>-Cu-Li alloys 1440, 1460, 1461, 1441, 1469, 2090, 2095, 8090, and Weldalite 049.</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://ntrs.nasa.gov/search.jsp?R=19900037800&hterms=phase-field&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dphase-field','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19900037800&hterms=phase-field&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dphase-field"><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, J.; Smialek, J. L.; Barrett, C. A.</p> <p>1989-01-01</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>203 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://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> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/379597','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/379597"><span id="translatedtitle">Reactive plasma spraying of <span class="hlt">Al</span>-Ti alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Entezarian, M.; Shanker, K.; Tsantrizos, P.G.; Allaire, F.; Immarigeon, J.P.; Drew, R.A.L.</p> <p>1995-12-31</p> <p>Reactive plasma spraying was used to synthesize <span class="hlt">Al</span> alloys containing a dispersion of Ti<span class="hlt">Al</span>{sub 3} intermetallics. Either <span class="hlt">Al</span> powder or <span class="hlt">Al</span> wire and TiCl{sub 4} were the raw materials used. The size, distribution, and morphology of the intermetallic phase were a function of the injection manner of the starting materials, the plasma process parameters, and the molar ratio of the reactants (TiCl{sub 4}/<span class="hlt">Al</span>). Under optimum conditions, a fine dispersion of micron sized intermetallics was obtained. Investigation of the reaction mechanism showed that the particle`s temperature was a critical factor in producing a fine dispersion of Ti<span class="hlt">Al</span>{sub 3} phase in an <span class="hlt">Al</span> matrix. Materials produced at temperatures below the melting point of Ti<span class="hlt">Al</span>{sub 3} resulted in a microstructure containing an <span class="hlt">Al</span> core with a Ti<span class="hlt">Al</span>{sub 3} shell. In contrast, materials produced at higher temperatures resulted in a fine Ti<span class="hlt">Al</span>{sub 3} phase precipitating from the <span class="hlt">Al</span>-Ti melt during the solidification process. Products were collected as porous deposited layers whose surface was contaminated with chlorides. The products were subjected to purification followed by hot rolling for further consolidation. The effectiveness of vacuum thermal treatment on the removal of Cl was investigated. <span class="hlt">Al</span> chlorides could be removed by thermal treatments at temperatures below the melting point of <span class="hlt">Al</span>, while some of the Ti subchlorides required higher temperatures. The mechanical properties of the consolidated materials were also determined and are reported.</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/2012ChPhL..29j8501L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012ChPhL..29j8501L"><span id="translatedtitle">Enhanced Light Extraction in <span class="hlt">Al</span>InGaN UV Light-Emitting Diodes by an Embedded <span class="hlt">AlN/Al</span>GaN Distributed Bragg Reflector</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Hui; Zhao, Heng; Hou, Jin; Liu, Dan; Gao, Yi-Hua</p> <p>2012-10-01</p> <p>A novel kind of <span class="hlt">Al</span>InGaN ultraviolet (UV) light-emitting diode (LED) with an embedded <span class="hlt">AlN/Al</span>0.3Ga0.7N distributed Bragg reflector (DBR) is proposed to enhance light extraction efficiency (LEE). The simulation technique we adopt to calculate the LEE of LEDs is based on the theory of spontaneous emission in a layered medium, the well-known mode-matching technique and the scattering matrix approach. The <span class="hlt">AlN/Al</span>0.3Ga0.7N DBR was intentionally designed to have peak reflectivity at the LED emission wavelength and the optical properties of the DBR were simulated by using the transfer matrix method. A high LEE of 45.7% at 370 nm wavelength was predicted for a proposed <span class="hlt">Al</span>InGaN UV LED consisting of 24 periods of the <span class="hlt">AlN/Al</span>0.3Ga0.7N DBR, which is 1.5 times of that of the conventional <span class="hlt">Al</span>InGaN UV LED. The investigation shows that the <span class="hlt">AlN/Al</span>0.3Ga0.7N DBR grown on GaN templates with sapphire as a substrate by MOCVD can enhance the LEE effectively and would be very promising for the fabrication of high performance GaN-based UV LEDs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1995ZPhyD..33..281C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1995ZPhyD..33..281C"><span id="translatedtitle">Gaussian density-functional study for small neutral (<span class="hlt">Al</span> n ), positive (<span class="hlt">Al</span>{/n +}) and negative (<span class="hlt">Al</span>{/n -}) aluminium clusters ( n=2 5)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Calaminici, Patrizia; Russo, Nino; Toscano, Marirosa</p> <p>1995-12-01</p> <p>The structures and properties of <span class="hlt">Al</span> n , <span class="hlt">Al</span>{/n +}, <span class="hlt">Al</span>{/n -} ( n=1,5) clusters have been investigated by using the Linear Combination of Gaussian Type Orbitals (LCGTO) method, considering Local (LSD) and Non Local (NLSD) Spin Density Approximations and employing a Model Core Potential (MCP) that allows the explicit treatment of 3 s 2 3 p 1 valence electrons. For each system different geometrical structures and electronic states have been considered. For <span class="hlt">Al</span>3, <span class="hlt">Al</span>{3/+}, <span class="hlt">Al</span>{3/-} the most stable geometry proved to be the equilateral triangle ( D 3 h ). <span class="hlt">Al</span>4 and <span class="hlt">Al</span>{4/+} prefer the rhombus ( D 2 h ) structure, while the corresponding anion prefers the square ( D 4 h ) one. The trapezoidal form ( C 2 v ) is the most stable isomer for <span class="hlt">Al</span>5, <span class="hlt">Al</span>{5/+} and <span class="hlt">Al</span>{5/-} clusters. The analysis of vibrational frequencies shows that these structures are minima in the potential energy surface. The binding energies ( D e), the adiabatic ionization potentials (IP) and electron affinities (EA), the chemical potentials or absolute hardnesses (η) and electronegativities (χ) have been computed. Results are in good agreement with the available experimental data and the previous high level theoretical computations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016APExp...9e3004S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016APExp...9e3004S"><span id="translatedtitle">Chemical ordering and large tunnel magnetoresistance in Co2Fe<span class="hlt">Al/MgAl</span>2O4/Co2Fe<span class="hlt">Al</span>(001) junctions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Scheike, Thomas; Sukegawa, Hiroaki; Inomata, Koichiro; Ohkubo, Tadakatsu; Hono, Kazuhiro; Mitani, Seiji</p> <p>2016-05-01</p> <p>Epitaxial magnetic tunnel junctions (MTJs) with a Co2Fe<span class="hlt">Al</span>/CoFe (0.5 nm)/Mg<span class="hlt">Al</span>2O4/Co2Fe<span class="hlt">Al</span>(001) structure were fabricated by magnetron sputtering. High-temperature in situ annealing led to a high degree of B2-order in the Co2Fe<span class="hlt">Al</span> layers and cation order of the Mg<span class="hlt">Al</span>2O4 barrier. Large tunnel magnetoresistance (TMR) of up to 342% was obtained at room temperature (616% at 4 K), in contrast to the TMR ratio ( ≲ 160%) suppressed by the band-folding effect in Fe/cation-ordered Mg<span class="hlt">Al</span>2O4/Fe MTJs. The present study reveals that the high degree of B2-order and the resulting high spin polarization in the Co2Fe<span class="hlt">Al</span> electrodes enable us to bypass the band-folding problem in spinel barriers.</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('https://www.gpo.gov/fdsys/pkg/FR-2012-12-11/pdf/2012-29868.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2012-12-11/pdf/2012-29868.pdf"><span id="translatedtitle">77 FR 73732 - In the Matter of the 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></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>... Matter of the 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>-Jihad, aka... fi Bilad <span class="hlt">al</span>-Rafidayn, aka The Organization of <span class="hlt">al</span>-Jihad's Base of Operations in Iraq, aka <span class="hlt">al</span>-Qaida of Jihad in Iraq, aka <span class="hlt">al</span>-Qaida in Iraq, aka <span class="hlt">al</span>-Qaida in Mesopotamia, aka <span class="hlt">al</span>-Qaida in the Land of the...</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> </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/2013ApPhL.102c2103C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013ApPhL.102c2103C"><span id="translatedtitle">Characterization of thin <span class="hlt">AlSb/Al</span>As barriers on InAs by mid-infrared intersubband absorption measurements</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Castellano, Fabrizio; Ohtani, Keita; Nevou, Laurent; Faist, Jerome</p> <p>2013-01-01</p> <p>We present mid-infrared intersubband absorption measurements on InAs/<span class="hlt">Al</span>Sb coupled-quantum-wells systems with thin <span class="hlt">Al</span>Sb barriers. The <span class="hlt">Al</span>Sb barrier width in our samples is varied between 1 and 4 monolayers, with a strained <span class="hlt">Al</span>As boundary layer used for strain compensation. The optical absorption energy difference between the 1-4 and 2-3 transitions is used as a measure of the barrier coupling strength and modeled by a one-band Schroedinger solver. Our results let us conclude that the composite <span class="hlt">AlSb/Al</span>As barrier behaves like an effective <span class="hlt">Al</span>Sb barrier with an effective thickness that does not include the last As layer. This observation must be taken into account when designing complex heterostructures relying on very thin <span class="hlt">Al</span>Sb, like in InAs/<span class="hlt">Al</span>Sb quantum cascade lasers.</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://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/2000NIMPB.172..925Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2000NIMPB.172..925Y"><span id="translatedtitle">Transplacental passage of 26<span class="hlt">Al</span> from pregnant rats to fetuses and 26<span class="hlt">Al</span> transfer through maternal milk to suckling rats</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.; Matsuzaki, H.; Kobayashi, T.; Tada, W.; Ohki, Y.; Kakimi, S.; Kobayashi, K.</p> <p>2000-10-01</p> <p>Aluminium (<span class="hlt">Al</span>) is toxic to the growth of fetuses and sucklings. However, the incorporation of <span class="hlt">Al</span> into fetuses and sucklings in the periods of gestation and lactation has not been well clarified because <span class="hlt">Al</span> lacks a suitable isotope for a tracer experiment. In this study, we used 26<span class="hlt">Al</span> (a radioisotope of <span class="hlt">Al</span> with half-life of 716,000 yr) as a tracer, and measured 26<span class="hlt">Al</span> incorporation into fetuses and sucklings by accelerator mass spectrometry (AMS). To investigate <span class="hlt">Al</span> incorporation into fetuses through transplacental passage, 26<span class="hlt">Al</span> ( 26<span class="hlt">Al</span>Cl 3) was subcutaneously injected into pregnant rats on day 15 of gestation. 26<span class="hlt">Al</span> was also subcutaneoulsy injected into lactating rats from day 1 to day 20 postpartum. By day 20 of gestation, 0.2% of the 26<span class="hlt">Al</span> injected into a pregnant rat had been transferred to the fetuses, and 26<span class="hlt">Al</span> was detected in the brain and liver of the fetuses. On day 9 postpartum, high levels of 26<span class="hlt">Al</span> were demonstrated in the brain, liver, kidneys and blood of suckling rats. It is concluded that 26<span class="hlt">Al</span> subcutaneously injected into pregnant rats and/or lactating rats is incorporated into their offspring through transplacental passage and/or maternal milk.</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://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/2009IJMPB..23.1407S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009IJMPB..23.1407S"><span id="translatedtitle">Tribological Properties of Ti(<span class="hlt">Al,O)/Al</span>2O3 Composite Coating by Thermal Spraying</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Salman, Asma; Gabbitas, Brian; Cao, Peng; Zhang, Deliang</p> <p></p> <p>The use of thermal spray coatings provides protection to the surfaces operating in severe environments. The main goal of the current work is to investigate the possibility of using a high velocity air fuel (HVAF) thermally sprayed wear resistant Ti(<span class="hlt">Al,O)/Al</span>2O3 coating on tool steel (H13) which is used for making dies for aluminium high pressure die casting and dummy blocks aluminium extrusion. A feedstock of Ti(<span class="hlt">Al,O)/Al</span>2O3 composite powder was produced from a mixture of <span class="hlt">Al</span> and TiO2 powders by high energy mechanical milling, followed by a thermal reaction process. The feedstock was then thermally sprayed using a high velocity air-fuel (HVAF) technique onto H13 steel substrates to produce a composite coating. The present study describes and compares the tribological properties such as friction and sliding wear rate of the coating both at room and high temperature (700°C). The wear resistance of the coating was investigated by a tribometer using a spherical ended alumina pin as a counter body under dry and lubricating conditions. The results showed that composite coating has lower wear rate at high temperature than at room temperature without using lubricant. The composite coating was characterized using scanning electron microscopy (SEM), optical microscopy and X-ray diffractometry (XRD). This paper reports the experimental observations and discusses the wear resistance performance of the coatings at room and high 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/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://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 μm-thick oxide using the process with an etch rate of 0.32-0.36 μm min-1 and a selectivity to <span class="hlt">Al</span>N mask of (38-49) : 1.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JaJAP..52jMA07K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JaJAP..52jMA07K"><span id="translatedtitle">Electrical Characteristics of Ti/<span class="hlt">Al</span> Contacts on <span class="hlt">Al</span>InN:Mg/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>Kim, Seongjun; Kim, Hee Jin; Choi, Suk; Lochner, Zachary; Ryou, Jae-Hyun; Dupuis, Russell D.; Ahn, Kwang-Soon; Kim, Hyunsoo</p> <p>2013-10-01</p> <p>The electrical characteristics of a Ti/<span class="hlt">Al</span> metal contact on Mg-doped <span class="hlt">Al</span>InN/GaN heterostructures were investigated using a transmission line model. The as-deposited Ti/<span class="hlt">Al</span> contact exhibited near Ohmic contact with a specific contact resistance of 1.78×10-2 Ω cm2, while the thermal annealing performed at 600 °C led to better Ohmic contact with a contact resistance of 9.38×10-4 Ω cm2. This could be attributed to the formation of a direct Ohmic path connecting the contact and the two-dimensional electron gas beneath an <span class="hlt">Al</span>InN:Mg barrier upon thermal annealing, namely, a spike contact through the indiffusion of <span class="hlt">Al</span> as verified from secondary ion mass spectroscopy. Current-voltage-temperature measurements showed an insignificant temperature dependence in both the sheet resistance and the contact resistance, which seemed to be associated with the distinctive feature of the spike contact.</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.; Beloevi?-?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://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 ρ 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/2016JTST..tmp...28T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JTST..tmp...28T"><span id="translatedtitle">Hot Corrosion Performance of <span class="hlt">AlO-CrO/NiCoCrAl</span>YTa and <span class="hlt">AlO/NiCoCrAl</span>YTa Coatings Deposited by Atmospheric Plasma Spraying</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tao, Chong; Wang, Lei; Cheng, Nailiang; Hu, Hengfa; Liu, Yang; Song, Xiu</p> <p>2016-03-01</p> <p><span class="hlt">AlO-CrO/NiCoCrAl</span>YTa and <span class="hlt">AlO/NiCoCrAl</span>YTa coatings were deposited on 316L stainless steel substrate using atmospheric plasma spraying, respectively, in order to improve the oxidation and corrosion resistance. The hot corrosion performance of the coatings at 700 and 900 °C were studied, and the detailed microstructures and phase composition of the coatings were analyzed using x-ray diffraction, scanning electron microscope with energy dispersive spectrometer, and transmission electron microscope. The results show that both coatings are structurally featured by slatted layers, consisting of amorphous phase, Cr2O3, Ni3<span class="hlt">Al</span>, and <span class="hlt">Al</span>2O3. The hot corrosion resistance of <span class="hlt">AlO-CrO/NiCoCrAl</span>YTa coating is better than that of <span class="hlt">AlO/NiCoCrAl</span>YTa coating. This improvement is attributed to lower porosity and more compact Cr2O3 in <span class="hlt">AlO-CrO/NiCoCrAl</span>YTa coating which performs better than <span class="hlt">Al</span>2O3 in blocking further inward progress of corrosion and oxidization.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JTST...25..797T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JTST...25..797T"><span id="translatedtitle">Hot Corrosion Performance of <span class="hlt">AlO-CrO/NiCoCrAl</span>YTa and <span class="hlt">AlO/NiCoCrAl</span>YTa Coatings Deposited by Atmospheric Plasma Spraying</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tao, Chong; Wang, Lei; Cheng, Nailiang; Hu, Hengfa; Liu, Yang; Song, Xiu</p> <p>2016-04-01</p> <p><span class="hlt">AlO-CrO/NiCoCrAl</span>YTa and <span class="hlt">AlO/NiCoCrAl</span>YTa coatings were deposited on 316L stainless steel substrate using atmospheric plasma spraying, respectively, in order to improve the oxidation and corrosion resistance. The hot corrosion performance of the coatings at 700 and 900 °C were studied, and the detailed microstructures and phase composition of the coatings were analyzed using x-ray diffraction, scanning electron microscope with energy dispersive spectrometer, and transmission electron microscope. The results show that both coatings are structurally featured by slatted layers, consisting of amorphous phase, Cr2O3, Ni3<span class="hlt">Al</span>, and <span class="hlt">Al</span>2O3. The hot corrosion resistance of <span class="hlt">AlO-CrO/NiCoCrAl</span>YTa coating is better than that of <span class="hlt">AlO/NiCoCrAl</span>YTa coating. This improvement is attributed to lower porosity and more compact Cr2O3 in <span class="hlt">AlO-CrO/NiCoCrAl</span>YTa coating which performs better than <span class="hlt">Al</span>2O3 in blocking further inward progress of corrosion and oxidization.</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://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://adsabs.harvard.edu/abs/2008SSCom.148...59A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008SSCom.148...59A"><span id="translatedtitle">First principles study of <span class="hlt">Al</span>Bi</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Amrani, B.; Achour, H.; Louhibi, S.; Tebboune, A.; Sekkal, N.</p> <p>2008-10-01</p> <p>Using the first principles method of the full potential linear augmented plane waves (FPLAPW), the structural and the electronic properties of <span class="hlt">Al</span>Bi are investigated. It is found that this compound has a small and direct semiconducting gap at Γ. Through the quasi-harmonic Debye model, in which the phononic effects are considered, the dependences of the volume, the bulk modulus, the variation of the thermal expansion α, as well as the Debye temperature θD and the heat capacity Cv are successfully obtained in the whole range from 0 to 30 GPa and temperature range from 0 to 1200 K.</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, Clment; 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> </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://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> <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=19920045624&hterms=rich&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Drich%2Bk','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19920045624&hterms=rich&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Drich%2Bk"><span id="translatedtitle">Compressive strength of directionally solidified Ni<span class="hlt">Al-NiAl</span>Nb intermetallics at 1200 and 1300 K</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Whittenberger, J. D.; Reviere, R.; Noebe, R. D.; Oliver, B. F.</p> <p>1992-01-01</p> <p>Results are presented from measurements of 1200 K and 1300 K compressive properties of two directionally solidified Ni<span class="hlt">Al-NiAl</span>Nb compositions (in at. pct): Ni-41.75<span class="hlt">Al</span>-16.5Nb (eutectic composition) and Ni-47.5<span class="hlt">Al</span>-8.9Nb-1.3C (<span class="hlt">Al</span>-rich composition). Results showed that the strength of the eutectic was a factor of 2 greater than that of the <span class="hlt">Al</span>-rich composition. However, the analysis of the compressive stress-strain data indicated that the deformation mechanism was the same in both materials.</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/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/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/2010APS..MARL32009H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010APS..MARL32009H"><span id="translatedtitle">The effect of defect structure on the dynamic frictional force at sliding <span class="hlt">Al/Al</span> interfaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hammerberg, J. E.; Holian, B. L.; Ravelo, R. J.; Germann, T. C.</p> <p>2010-03-01</p> <p>For moderate sliding velocities, less than velocities which induce structural or phase transformations, the defect and dislocation densities determine the local plastic flow characteristics near a sliding interface. We present the results of large-scale NEMD simulations for the tangential frictional force at an <span class="hlt">Al/Al</span> interface in the velocity range 10 - 500 m/s for pressures of 15 GPa. The defect structures in the initial state are similar to those used in NEMD simulations to characterize the effect of defect densities on the high strain rate branch of the flow stress for Cu and <span class="hlt">Al</span> (R.Ravelo, B.L.Holian and T.C.Germann, SCCM-2009). We discuss the contribution to dissipation of pre-existing defects and dynamically generated defects and their influence on the resulting steady state frictional force.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19780069154&hterms=MULTICOMPONENT+REACTIONS&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DMULTICOMPONENT%2BREACTIONS','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19780069154&hterms=MULTICOMPONENT+REACTIONS&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DMULTICOMPONENT%2BREACTIONS"><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/20879955','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20879955"><span id="translatedtitle">The microstructure and stability of <span class="hlt">Al/Al</span>N multilayered films</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Xiao, X. L.; McCulloch, D. G.; McKenzie, D. R.; Bilek, M. M. M.</p> <p>2006-07-01</p> <p><span class="hlt">Al/Al</span>N multilayers with bilayer thicknesses ranging from 10 to 50 nm were fabricated using a filtered cathodic arc deposition system. The effects on the microstructure of using two different deposition rates and applying an 8 kV pulsed voltage (plasma immersion ion implantation or PIII) to the substrate were explored. The microstructure was found to undergo a transition in which the <span class="hlt">Al</span> transformed from layers to an aggregated phase under some conditions. This behavior is explained by a model in which the aggregation process is limited by diffusion. High deposition rates and the application of PIII were both found to encourage the transition by increasing diffusion. The model defines a phase diagram which predicts whether a multilayer or an aggregated structure will occur. A maximum in intrinsic stress was found to occur when the average feature size was 15 nm for both layers and aggregates.</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=19930060673&hterms=etching+aluminum&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Detching%2Baluminum','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19930060673&hterms=etching+aluminum&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Detching%2Baluminum"><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://adsabs.harvard.edu/abs/2009EPJAP..45b0502L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009EPJAP..45b0502L"><span id="translatedtitle">Spectroscopic study of interfaces in <span class="hlt">Al</span>/Ni periodic multilayers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Le Guen, K.; Gamblin, G.; Jonnard, P.; Salou, M.; Ben Youssef, J.; Rioual, S.; Rouvellou, B.</p> <p>2009-02-01</p> <p>Using electron-induced X-ray emission spectroscopy (XES), we have studied two <span class="hlt">Al</span>/Ni periodic multilayers that differ only by their annealing temperature: as-deposited and annealed at 115 °C. Our aim is to show that XES can provide further details about the chemistry at the metal-metal interface, in addition to what is obtained by X-ray diffraction. The distribution of valence states exhibiting <span class="hlt">Al</span> 3p and Ni 3d character is determined from the analysis of the <span class="hlt">Al</span>Kβ and NiLα emission bands respectively. The multilayer emission bands are compared to those of reference materials: pure <span class="hlt">Al</span> and Ni metals as well as <span class="hlt">Al</span>{3}Ni, <span class="hlt">Al</span>{3}Ni{2} and <span class="hlt">Al</span>Ni intermetallics. We provide evidence that, for temperatures up to 115 °C, <span class="hlt">Al</span>{3}Ni is the major component of the multilayer.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010GeCoA..74.1220Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010GeCoA..74.1220Y"><span id="translatedtitle">Density functional theory study and kinetic analysis of the formation mechanism of <span class="hlt">Al</span> 30O 8(OH) 56(H 2O) 2618+ (<span class="hlt">Al</span> 30) in aqueous solution</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yang, Wenjing; Qian, Zhaosheng; Lu, Bangmei; Zhang, Jing; Bi, Shuping</p> <p>2010-02-01</p> <p>The formation mechanism of <span class="hlt">Al</span> 30O 8(OH) 56(H 2O) 2618+ (<span class="hlt">Al</span> 30) has been investigated by the density functional theory based on the supermolecule model and kinetic analysis on the 27<span class="hlt">Al</span> nuclear magnetic resonance (NMR) experimental results in monitoring <span class="hlt">Al</span> 30 synthesis process. The theoretical chemistry calculations on the four possible schemes show that δ-Na-<span class="hlt">Al</span> 13 is the reasonable intermediate followed by the substitution of Na with <span class="hlt">Al</span> to form δ-<span class="hlt">Al</span> 14, and Na + plays an important role in stabilizing the intermediate (δ-Na-<span class="hlt">Al</span> 13) in the transformation. The kinetic analysis on the 27<span class="hlt">Al</span> NMR experimental data indicates that ɛ-<span class="hlt">Al</span> 13 decomposes and isomerizes in the formation of <span class="hlt">Al</span> 30, while <span class="hlt">Al</span> monomers facilitate the decomposition of ɛ-<span class="hlt">Al</span> 13 and so the isomerization of ɛ-isomers to δ-isomers effectively. The favorable formation mechanism of <span class="hlt">Al</span> 30 includes three steps: (1) ɛ-<span class="hlt">Al</span> 13 decomposes and rearranges into the isomer δ-<span class="hlt">Al</span> 13; (2) Na + reacts with δ-<span class="hlt">Al</span> 13 to stabilize the intermediate δ-Na-<span class="hlt">Al</span> 13, followed by <span class="hlt">Al</span> monomers replacing Na to form δ-<span class="hlt">Al</span> 14; (3) δ-<span class="hlt">Al</span> 14 reacts with the <span class="hlt">Al</span> monomers in the solution to finally form <span class="hlt">Al</span> 30. Both <span class="hlt">Al</span> monomers and Na + are important in the transformation. <span class="hlt">Al</span> monomers are the basic building units and helpful to the isomerization while Na + can well stabilize the isomer δ-<span class="hlt">Al</span> 13 to yield intermediate δ-Na-<span class="hlt">Al</span> 13. The results also show that other isomers of ɛ-<span class="hlt">Al</span> 13 (β-<span class="hlt">Al</span> 13 and α-<span class="hlt">Al</span> 13) form in the formation of <span class="hlt">Al</span> 30, and their calculated 27<span class="hlt">Al</span> NMR tetrahedral resonance shifts are consistent with the experimental 27<span class="hlt">Al</span> NMR tetrahedral signals in the preparation process of <span class="hlt">Al</span> 30.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20160005369','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20160005369"><span id="translatedtitle">Carb<span class="hlt">Al</span> Heat Transfer Material</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Fink, Richard</p> <p>2015-01-01</p> <p>The increasing use of power electronics, such as high-current semiconductor devices and modules, within space vehicles is driving the need to develop specialty thermal management materials in both the packaging of these discrete devices and the packaging of modules consisting of these device arrays. Developed by Applied Nanotech, Inc. (ANI), Carb<span class="hlt">Al</span> heat transfer material is uniquely characterized by its low density, high thermal diffusivity, and high thermal conductivity. Its coefficient of thermal expansion (CTE) is similar to most power electronic materials, making it an effective base plate substrate for state-of-the-art silicon carbide (SiC) super junction transistors. The material currently is being used to optimize hybrid vehicle inverter packaging. Adapting Carb<span class="hlt">Al</span>-based substrates to space applications was a major focus of the SBIR project work. In Phase I, ANI completed modeling and experimentation to validate its deployment in a space environment. Key parameters related to cryogenic temperature scaling of CTE, thermal conductivity, and mechanical strength. In Phase II, the company concentrated on improving heat sinks and thermally conductive circuit boards for power electronic applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015ApJ...809...31G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015ApJ...809...31G"><span id="translatedtitle">Inferred Initial 26<span class="hlt">Al</span>/27<span class="hlt">Al</span> Ratios in Presolar Stardust Grains from Supernovae are Higher than Previously Estimated</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Groopman, Evan; Zinner, Ernst; Amari, Sachiko; Gyngard, Frank; Hoppe, Peter; Jadhav, Manavi; Lin, Yangting; Xu, Yuchen; Marhas, Kuljeet; Nittler, Larry R.</p> <p>2015-08-01</p> <p>We performed an in-depth exploration of the <span class="hlt">Al</span>-Mg system for presolar graphite, SiC, and Si3N4 grains found to contain large excesses of 26Mg, indicative of the initial presence of live 26<span class="hlt">Al</span>. Ninety of the more than 450 presolar grains processed in this study contain well-correlated {δ }26{Mg}{/}24{Mg} and 27<span class="hlt">Al</span>/24Mg ratios, derived from Nano-scale Secondary Ion Mass Spectrometer depth profiles, whose isochron-like regression lines yield inferred initial {}26{<span class="hlt">Al</span>}{/}27{<span class="hlt">Al</span>} ratios that, on average, are ˜1.5-2 times larger than the ratios previously reported for the grains. The majority of presolar graphite and SiC grains are heavily affected by <span class="hlt">Al</span> contamination, resulting in large negative {δ }26{Mg}{/}24{Mg} intercepts of the isochron lines. <span class="hlt">Al</span> contamination is potentially due to etching of the grains’ surfaces and subsequent capture of dissolved <span class="hlt">Al</span> during the acid dissolution of their meteorite host rocks. From the isochron fits, the magnitude of <span class="hlt">Al</span> contamination was quantified for each grain. The amount of <span class="hlt">Al</span> contamination on each grain was found to be random and independent of grain size, following a uniform distribution with an upper bound at 59% contamination. The <span class="hlt">Al</span> contamination causes conventional whole-grain estimates to underpredict the initial {}26{<span class="hlt">Al</span>}{/}27{<span class="hlt">Al</span>} ratios. The presolar grains with the highest {}26{<span class="hlt">Al</span>}{/}27{<span class="hlt">Al</span>} ratios are from Type II supernovae whose isochron-derived initial {}26{<span class="hlt">Al</span>}{/}27{<span class="hlt">Al</span>} ratios greatly exceed those predicted in the He/C and He/N zones of SN models.</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/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/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> </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://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://www.osti.gov/scitech/biblio/421419','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/421419"><span id="translatedtitle"><span class="hlt">Al</span>-Fe-Ni (Aluminum-Iron-Nickel)</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Raghavan, V.</p> <p>1994-08-01</p> <p>[88Ray] reviewed the experimental results on the phase equilibria of this system. The reviewed results were presented as: (1) liquidus and solidus projections for <span class="hlt">Al</span>-poor Fe-Ni alloys and for compositions near the <span class="hlt">Al</span>-corner; (2) a reaction sequence for the solidification reactions; (3) isothermal sections at 1250, 950, 850, and 750{degrees}C for <span class="hlt">Al</span>-poor Fe-Ni compositions; and (4) an isothermal section at 600{degrees}C near the <span class="hlt">Al</span>-corner.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JEE....65..174P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JEE....65..174P"><span id="translatedtitle">Ac Impedance Spectroscopy Of <span class="hlt">Al/A-Sic/C-Si(P)/Al</span> Heterostructure under Illumination</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Perný, Milan; Šály, Vladimír; Váry, Michal; Mikolášek, Miroslav; Huran, Jozef; Packa, Juraj</p> <p>2014-05-01</p> <p>The amorphous silicon carbide/crystalline silicon heterojunction was prepared and analyzed. The current-voltage (I - V ) measurements showed the barrier properties of prepared sample. Biased impedance spectra of <span class="hlt">Al/a-SiC/c-Si(p)/Al</span> heterojunction under the standard illumination are reported and analyzed. AC measurements in the illuminated conditions were processed in order to identify electronic behavior using equivalent AC circuit which was suggested and obtained by fitting the measured impedance data. A phenomenon of negative capacitance/resistance in certain frequency range has been observed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003IJMPB..17..751C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003IJMPB..17..751C"><span id="translatedtitle">NB/<span class="hlt">AL</span>2O3/<span class="hlt">AL</span>/MGB2 Large Area Thin Films Heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Carapella, G.; Martucciello, N.; Costabile, G.; Ferdeghini, C.; Ferrando, V.; Grassano, G.</p> <p></p> <p>We report the demonstration of dc and ac Josephson effects as well as conductance spectra measurements on Nb/<span class="hlt">Al</span>2O3/<span class="hlt">Al</span>/MgB2 thin films heterostructure. The heterostructure exhibits moderately hysteretic current-voltage characteristic with a dc Josephson current branch and regular microwave-induced Shapiro steps. Conductance spectra measurements point toward a two-gap scenario and are explained with the probable presence of tunneling both from dirty limit regions, reflecting a proximized order parameter Δdirty ~ 2 meV, and from clean limit regions, reflecting a proximized order parameter Δ3D ~ 0.9 meV.</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/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/scitech/servlets/purl/1178259','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/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/scitech">SciTech Connect</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://adsabs.harvard.edu/abs/2016ApPhA.122..500R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016ApPhA.122..500R"><span id="translatedtitle">Laser ablation of <span class="hlt">Al</span>-Ni alloys and multilayers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Roth, Johannes; Trebin, Hans-Rainer; Kiselev, Alexander; Rapp, Dennis-Michael</p> <p>2016-05-01</p> <p>Laser ablation of <span class="hlt">Al</span>-Ni alloys and multilayers has been studied by molecular dynamics simulations. The method was combined with a two-temperature model to describe the interaction between the laser beam, the electrons, and the atoms. As a first step, electronic parameters for the alloys had to be found and the model developed originally for pure metals had to be generalized to multilayers. The modifications were verified by computing melting depths and ablation thresholds for pure <span class="hlt">Al</span> and Ni. Here known data could be reproduced. The improved model was applied to the alloys <span class="hlt">Al</span>_3Ni, <span class="hlt">Al</span>Ni and <span class="hlt">Al</span>Ni_3. While melting depths and ablation thresholds for <span class="hlt">Al</span>Ni behave unspectacular, sharp drops at high fluences are observed for <span class="hlt">Al</span>_3Ni and <span class="hlt">Al</span>Ni_3. In both cases, the reason is a change in ablation mechanism from phase explosion to vaporization. Furthermore, a phase transition occurs in <span class="hlt">Al</span>_3Ni. Finally, <span class="hlt">Al</span> layers of various thicknesses on a Ni substrate have been simulated. Above threshold, 8 nm <span class="hlt">Al</span> films are ablated as a whole while 24 nm <span class="hlt">Al</span> films are only partially removed. Below threshold, alloying with a mixture gradient has been observed in the thin layer system.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2012-07-09/pdf/2012-16620.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2012-07-09/pdf/2012-16620.pdf"><span id="translatedtitle">77 FR 40265 - Drawbridge Operation Regulation; Tennessee River, Decatur, <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>2012-07-09</p> <p>... SECURITY Coast Guard 33 CFR Part 117 Drawbridge Operation Regulation; Tennessee River, Decatur, <span class="hlt">AL</span> AGENCY... across the Tennessee River, mile 304.4, at Decatur, <span class="hlt">AL</span>. The deviation is necessary to install new rail..., at Decatur, <span class="hlt">AL</span>. The vertical clearance of the bridge in the closed position is 10.5 feet. The...</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://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/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://ntrs.nasa.gov/search.jsp?R=19790027929&hterms=phase-field&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dphase-field','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19790027929&hterms=phase-field&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dphase-field"><span id="translatedtitle">Interdiffusion and intrinsic diffusion in the Ni<span class="hlt">Al</span> /delta/ phase of the <span class="hlt">Al</span>-Ni system</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Shankar, S.; Seigle, L. L.</p> <p>1978-01-01</p> <p>Interdiffusion coefficients at 950 to 1150 C and the ratio of intrinsic diffusion coefficients at 1100 C were measured as functions of composition in the Ni<span class="hlt">Al</span> (delta) phase of the <span class="hlt">Al</span>-Ni system, using a vapor-solid technique. Diffusivity values were also obtained for the Ni3<span class="hlt">Al</span> (epsilon) and Ni (<span class="hlt">Al</span>) solid solution (zeta) phases from 950 to 1150 C. The interdiffusion coefficient in Ni<span class="hlt">Al</span> (delta) varies several orders of magnitude over the delta phase field with a deep minimum in the diffusivity-composition curve at 48 to 49 at% <span class="hlt">Al</span>. The ratio of intrinsic diffusion coefficients DNi/DAl, in the delta phase also varies with composition from a value of 3 to 3.5 below 50 at% <span class="hlt">Al</span> to 0.1 or less above 50 at% <span class="hlt">Al</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22475623','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22475623"><span id="translatedtitle">Structure of oxides prepared by decomposition of layered double Mg–<span class="hlt">Al</span> and Ni–<span class="hlt">Al</span> hydroxides</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Cherepanova, Svetlana V.; Leont’eva, Natalya N.; Arbuzov, Aleksey B.; Drozdov, Vladimir A.; Belskaya, Olga B.; Antonicheva, Nina V.</p> <p>2015-05-15</p> <p>Abstracts: Thermal decomposition of Mg–<span class="hlt">Al</span> and Ni–<span class="hlt">Al</span> layered double hydroxides LDH at temperatures lower than 800 °C leads to the formation of oxides with different structures. Mg–<span class="hlt">Al</span> oxide has a very defective structure and consists of octahedral layers as in periclase MgO and mixed octahedral–tetrahedral layers as in spinel Mg<span class="hlt">Al</span>{sub 2}O{sub 4}. Mixed Ni–<span class="hlt">Al</span> oxide has a sandwich-like structure, consisting of a core with <span class="hlt">Al</span>-doped NiO-like structure and some surface layers with spinel Ni<span class="hlt">Al</span>{sub 2}O{sub 4} structure epitaxial connected with the core. Suggested models were verified by simulation of X-ray diffraction patterns using DIFFaX code, as well as HRTEM, IR-, UV-spectroscopies, and XPS. - Graphical abstract: In the Mg–<span class="hlt">Al</span> layered double hydroxide <span class="hlt">Al</span>{sup 3+} ions migrate into interlayers during decomposition. The Mg–<span class="hlt">Al</span> oxide represents sequence of octahedral and octahedral–tetrahedral spinel layers with vacancies. The Ni–<span class="hlt">Al</span> oxide has a sandwich-like structure with NiO-like core and surface spinel layers as a result of migration of <span class="hlt">Al</span>{sup 3+} ions on the surface. The models explain the presence and absence of “memory effect” for the Mg–<span class="hlt">Al</span> and Ni–<span class="hlt">Al</span> oxides, respectively. - Highlights: • We study products of Mg(Ni)–<span class="hlt">Al</span> LDH decomposition by calcination at 500(400)–800 °C. • In Mg–<span class="hlt">Al/Ni–Al</span> LDH <span class="hlt">Al</span> ions migrate into interlayers/on the surface during decomposition. • Mg–<span class="hlt">Al</span> oxide represents sequence of periclase- and spinel-like layers with vacancies. • Ni–<span class="hlt">Al</span> oxide has a sandwich-like structure with NiO-like core and surface spinel layers. • The models explain the presence/absence of “memory effect” for Mg–<span class="hlt">Al/Ni–Al</span> oxides.</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> </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://adsabs.harvard.edu/abs/2011ApSS..257.3489A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011ApSS..257.3489A"><span id="translatedtitle">Enhanced fibroblast cell adhesion on <span class="hlt">Al/Al</span>2O3 nanowires</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Aktas, O. C.; Sander, M.; Miró, M. M.; Lee, J.; Akkan, C. K.; Smail, H.; Ott, A.; Veith, M.</p> <p>2011-02-01</p> <p>Biological cells stick together via transmembrane proteins, which are linked to receptor molecules of the extracellular matrix (ECM). This specific biochemical adhesion plays a leading role in many cellular processes, among them cell differentiation, morphogenesis, and wound healing. Various medical applications require endogen cells to bind to an exogene substrate as in the case of an implant. Coatings with proteins that naturally belong to the ECM are known to enhance the cell adhesion. However, the choice of inorganic materials, which promote cell adhesion, is limited. Here, we report on a new engineered surface composed of <span class="hlt">Al/Al</span>2O3 bi-phasic nanowires (NWs), which promotes the adhesion of fibroblast cells. Fibroblasts grow well on this inorganic layer and keep proliferating. Using the cell monolayer rheology (CMR) technique, we show that the adhesion of fibroblasts on <span class="hlt">Al/Al</span>2O3 NWs is comparable to fibronectin coated surfaces. To our knowledge, this is one of the strongest cell adhesions on an inorganic surface, which has been reported on so far, since it compares to bio-organic layers such as fibronectin.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016ApPhL.108f3104L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016ApPhL.108f3104L"><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://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lu, T. M.; Wang, G. T.; Pan, W.; Zhao, S.; Mi, Z.</p> <p>2016-02-01</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 at fields several times higher than critical magnetic field. An unexpected non-monotonic magnetic field dependence of the peak position is observed. 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.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011MMTA...42..170M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011MMTA...42..170M"><span id="translatedtitle">X-Ray Videomicroscopy Studies of Eutectic <span class="hlt">Al</span>-Si Solidification in <span class="hlt">Al</span>-Si-Cu</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mathiesen, R. H.; Arnberg, L.; Li, Y.; Meier, V.; Schaffer, P. L.; Snigireva, I.; Snigirev, A.; Dahle, A. K.</p> <p>2011-01-01</p> <p><span class="hlt">Al</span>-Si eutectic growth has been studied in-situ for the first time using X-ray video microscopy during directional solidification (DS) in unmodified and Sr-modified <span class="hlt">Al</span>-Si-Cu alloys. In the unmodified alloys, Si is found to grow predominantly with needle-like tip morphologies, leading a highly irregular progressing eutectic interface with subsequent nucleation and growth of <span class="hlt">Al</span> from the Si surfaces. In the Sr-modified alloys, the eutectic reaction is strongly suppressed, occurring with low nucleation frequency at undercoolings in the range 10 K to 18 K. In order to transport Cu rejected at the eutectic front back into the melt, the modified eutectic colonies attain meso-scale interface perturbations that eventually evolve into equiaxed composite-structure cells. The eutectic front also attains short-range microscale interface perturbations consistent with the characteristics of a fibrous Si growth. Evidence was found in support of Si nucleation occurring on potent particles suspended in the melt. Yet, both with Sr-modified and unmodified alloys, Si precipitation alone was not sufficient to facilitate the eutectic reaction, which apparently required additional undercooling for <span class="hlt">Al</span> to form at the Si-particle interfaces.</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://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://adsabs.harvard.edu/abs/2009IJMPB..23.1377P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009IJMPB..23.1377P"><span id="translatedtitle">Microstructure and Mechanical Properties of Hypereutectic <span class="hlt">Al-Si/Al</span>Np Composite</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Park, Seulki; Choi, Jinmyung; Park, Bonggyu; Park, Ikmin; Park, Yongho; Kim, Yongjin</p> <p></p> <p>Hypereutectic <span class="hlt">Al</span>-Si alloys with fine and evenly distributed Si precipitates have superior mechanical properties In this study, hypereutectic <span class="hlt">Al</span>-Si alloy powders which contained 15 and 20wt% Si were prepared by a gas atomization process. 1, 3 and 5wt% <span class="hlt">Al</span>N particles were blended with the <span class="hlt">Al</span>-Si alloy powders using turbular mixer. The mixture was consolidated by Hot Press at 550°C for 1h under 60MPa. Relative density of the sintered samples was about 98% of theoretical density. This study was investigated by two ways. One is the effect of reinforcement weight fraction and the other is the effect of Silicon contents on the mechanical properties of the composite. Microstructural characterization and phase evaluation were carried out using X-ray Diffraction, Scanning Electron Microscopy equipped with Energy Dispersive Spectrometer. The results showed that the smaller the reinforcement particle size was and the better its distribution was, the higher ultimate tensile strength and hardness were.</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>2016-02-01</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://eric.ed.gov/?q=cronbach+AND+alpha+AND+reliability&pg=6&id=EJ923625','ERIC'); return false;" href="http://eric.ed.gov/?q=cronbach+AND+alpha+AND+reliability&pg=6&id=EJ923625"><span id="translatedtitle">Aesthetic Leadership (<span class="hlt">AL</span>): Development and Implementation of Aesthetic Leadership Scale (<span class="hlt">ALS</span>) of the School Directors</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>Polat, Soner; Oztoprak-Kavak, Zehra</p> <p>2011-01-01</p> <p>This study aims to develop a scale for measuring the aesthetic leadership (<span class="hlt">AL</span>) characteristics of the school directors and to show that it can be applicable. The population of the study is composed of the teachers who are on duty in the elementary, secondary and high schools located in Izmit, Kocaeli. Sample of this descriptive study comprises 400…</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/2016APS..MAR.M1382H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016APS..MAR.M1382H"><span id="translatedtitle">Enhanced TC in granular and thin film <span class="hlt">Al-Al</span>2O3 nanostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Higgins, J. S.; Greene, R. L.</p> <p></p> <p>It is known since the 1970s that the superconducting transition temperature of granular aluminum films can be as high as two to three times the transition temperature of bulk aluminum, depending on the grain size and how strongly the nanometer size grains are connected1,2. As the strength of the grain connectivity becomes increasingly weak, the enhanced TC is suppressed. The mechanism behind this enhancement is still under debate. Recently, work on larger aluminum nanoparticles (18nm) embedded in an insulating <span class="hlt">Al</span>2O3 matrix showed an onset of the superconducting transition as high as three times that of bulk aluminum3. In this situation, the <span class="hlt">Al</span> grains are electrically disconnected and in a regime far removed from that of the granular films. Here we compare the two situations through electronic and thermal measurements in order to help elucidate the mechanism behind the enhancements. 1S. Pracht, et <span class="hlt">al</span>., arXiv:1508.04270v1 [cond-mat.supr-con] (2015). 2G. Deutscher, New Superconductors From Granular to High TC, New Jersey: World Scientific, 2006, p. 72-74. 3V. N. Smolyaninova, et <span class="hlt">al</span>., Sci. Rep. 5, 15777 (2015). Funding by NSF DMR # 1410665.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007SPIE.6473E..1HS','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007SPIE.6473E..1HS"><span id="translatedtitle">High reflectivity ultraviolet distributed Bragg reflector based on <span class="hlt">AlGaN/Al</span>GaN multilayer</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shimada, Ryoko; Xie, Jinqiao; Morkoç, Hadis</p> <p>2007-02-01</p> <p><span class="hlt">AlGaN/Al</span>GaN distributed Bragg reflectors (DBRs) designed for the ultraviolet spectral region have been attained. The crack-free structures were grown on c-plane sapphire by plasma assisted molecular beam epitaxy (MBE). To minimize the built-in strain in DBRs, a thin buffer layer was used directly on c-plane sapphire. A peak reflectivity of 95% at 381 nm with a 21 nm stop band width was obtained at room temperature (RT) using a 32.5 pairs <span class="hlt">Al</span> 0.7Ga 0.3N/<span class="hlt">Al</span> 0.15Ga 0.85N DBR. With a driving force for DBRs and emitting regions in wide band gap semiconductor microcavities, such as those based on GaN and ZnO, is the quest for cavity polariton which is the coupled mode between the exciton and photon modes. Moreover, the exploitation of cavity polaritons could be expected in the course of the development of extremely low-threshold optoelectronics devices.</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://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/27058131','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27058131"><span id="translatedtitle">Enhancing phosphate adsorption by Mg/<span class="hlt">Al</span> layered double hydroxide functionalized biochar with different Mg/<span class="hlt">Al</span> ratios.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Li, Ronghua; Wang, Jim J; Zhou, Baoyue; Awasthi, Mukesh Kumar; Ali, Amjad; Zhang, Zengqiang; Gaston, Lewis A; Lahori, Altaf Hussain; Mahar, Amanullah</p> <p>2016-07-15</p> <p>Mg/<span class="hlt">Al</span> ratio plays a significant role for anion adsorption by Mg/<span class="hlt">Al</span>-layered double hydroxides (Mg/<span class="hlt">Al</span>-LDHs) modified biochar. In this study, Mg/<span class="hlt">Al</span>-LDHs biochar with different Mg/<span class="hlt">Al</span> ratios (2, 3, 4) were prepared by co-precipitation for phosphate removal from aqueous solution. Factors on phosphate adsorption including Mg/<span class="hlt">Al</span> ratio, pH, and the presence of other inorganic anions were investigated through batch experiments. Increasing Mg/<span class="hlt">Al</span> ratio in the Mg/<span class="hlt">Al</span>-LDHs biochar composites generally enhanced phosphate adsorption with Langmuir adsorption maximum calculated at 81.83mg phosphorous (P) per gram of 4:1Mg/<span class="hlt">Al</span>-LDHs biochar at pH3.0. The adsorption process was best described by the pseudo-second-order kinetic model. Solution pH had greater effects on the phosphate adsorption by Mg/<span class="hlt">Al</span> LDHs biochar composites with lower Mg/<span class="hlt">Al</span> ratios. The presence of other inorganic anions decreased the phosphate adsorption efficiency in the order of F(-) > SO4(2-) > NO2(-) >Cl(-). Phosphate adsorption mechanism involves ion exchange, electrostatic attraction and surface inner-sphere complex formation. Overall, Mg/<span class="hlt">Al</span>-LDHs biochar composites offer a potential alternative of carbon-based adsorbent for phosphate removal from aqueous solution. PMID:27058131</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://adsabs.harvard.edu/abs/1993SPIE.1805...54K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1993SPIE.1805...54K"><span id="translatedtitle"><span class="hlt">Al</span>-Si-Cu/TiN multilayer interconnection and <span class="hlt">Al</span>-Ge reflow sputtering technologies for quarter-micron devices</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kikkawa, Takamaro; Kikuta, Kuniko</p> <p>1993-05-01</p> <p>Issues of interconnection technologies for quarter-micron devices are the reliability of metal lines with quarter-micron feature sizes and the formation of contact-hole-plugs with high aspect ratios. This paper describes a TiN/<span class="hlt">Al</span>-Si-Cu/TiN/<span class="hlt">Al</span>-Si-Cu/TiN/Ti multilayer conductor structure as a quarter-micron interconnection technology and aluminum-germanium (<span class="hlt">Al</span>-Ge) reflow sputtering as a contact-hole filling technology. The TiN/<span class="hlt">Al</span>-Si-Cu/TiN/<span class="hlt">Al</span>-Si-Cu/TiN/Ti multilayer conductor structure could suppress stress-induced voiding and improve the electromigration mean-time to failure. These improvements are attributed to the fact that the grain boundaries for the <span class="hlt">Al</span>-Si-Cu film and the interfaces between the <span class="hlt">Al</span>-Si-Cu and the TiN films are strengthened by the rigid intermetallic compound, Ti<span class="hlt">Al</span>3. The <span class="hlt">Al</span>-Ge alloy reflow sputtering is a candidate for contact- and via-hole filling technologies in terms of reducing fabrication costs. The <span class="hlt">Al</span>-Ge reflow sputtering achieved low temperature contact hole filling at 300 degree(s)C. Contact holes with a diameter of 0.25 micrometers and aspect ratio of 4 could be filled. This is attributed to the low eutectic temperature for <span class="hlt">Al</span>-Ge (424 degree(s)C) and the effect of thin polysilicon underlayer on the enhancement of <span class="hlt">Al</span>-Ge reflow.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/FR-2012-06-26/pdf/2012-15587.pdf','FEDREG'); return false;" href="https://www.gpo.gov/fdsys/pkg/FR-2012-06-26/pdf/2012-15587.pdf"><span id="translatedtitle">77 FR 38126 - The Designation of Khalid <span class="hlt">al</span>-Barnawi, Also Known as Khalid Barnawi, Also Known as Khaled <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>2012-06-26</p> <p>... Designation of Khalid <span class="hlt">al</span>-Barnawi, Also Known as Khalid Barnawi, Also Known as Khaled <span class="hlt">al</span>-Barnawi, Also Known as Khaled el- Barnaoui, Also Known as Mohammed Usman, Also Known as Abu Hafsat, as a Specially Designated... that the individual known as Khalid <span class="hlt">al</span>- Barnawi, also known as Khalid Barnawi, also known as Khaled...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4848514','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4848514"><span id="translatedtitle">Revealing heterogeneous nucleation of primary Si and eutectic Si by <span class="hlt">Al</span>P in hypereutectic <span class="hlt">Al</span>-Si alloys</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, Jiehua; Hage, Fredrik S.; Liu, Xiangfa; Ramasse, Quentin; Schumacher, Peter</p> <p>2016-01-01</p> <p>The heterogeneous nucleation of primary Si and eutectic Si can be attributed to the presence of <span class="hlt">Al</span>P. Although P, in the form of <span class="hlt">Al</span>P particles, is usually observed in the centre of primary Si, there is still a lack of detailed investigations on the distribution of P within primary Si and eutectic Si in hypereutectic <span class="hlt">Al</span>-Si alloys at the atomic scale. Here, we report an atomic-scale experimental investigation on the distribution of P in hypereutectic <span class="hlt">Al</span>-Si alloys. P, in the form of <span class="hlt">Al</span>P particles, was observed in the centre of primary Si. However, no significant amount of P was detected within primary Si, eutectic Si and the <span class="hlt">Al</span> matrix. Instead, P was observed at the interface between the <span class="hlt">Al</span> matrix and eutectic Si, strongly indicating that P, in the form of <span class="hlt">Al</span>P particles (or <span class="hlt">Al</span>P ‘patch’ dependent on the P concentration), may have nucleated on the surface of the <span class="hlt">Al</span> matrix and thereby enhanced the heterogeneous nucleation of eutectic Si. The present investigation reveals some novel insights into heterogeneous nucleation of primary Si and eutectic Si by <span class="hlt">Al</span>P in hypereutectic <span class="hlt">Al</span>-Si alloys and can be used to further develop heterogeneous nucleation mechanisms based on adsorption. PMID:27120994</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/2010IJMPB..24.3203Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010IJMPB..24.3203Z"><span id="translatedtitle">Effect of <span class="hlt">al</span> Content on the Combustion Synthesis of (TiB2-<span class="hlt">Al</span>2O3)/<span class="hlt">Al</span> Products from AN <span class="hlt">Al</span>-TiO2-B2O3 System</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhan, Lei; Shen, Ping; Jiang, Qichuan</p> <p></p> <p>The effect of <span class="hlt">Al</span> content on the self-propagating high-temperature synthesis (SHS) reaction among <span class="hlt">Al</span>, TiO2 and B2O3 was experimentally investigated. The <span class="hlt">Al</span> content plays an important role in controlling the reaction behaviors. With the increase in reactant <span class="hlt">Al</span>, the maximum combustion temperature decreases, the propagating wave velocity first increases and then decreases, while the ignition delay time shows an opposite tendency. More importantly, the increase of the <span class="hlt">Al</span> content in the reactants has an insignificant effect on the phase constitutions of the synthesized products but reduces the size of the synthesized TiB2 particles.</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://adsabs.harvard.edu/abs/2004AIPC..706..565H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2004AIPC..706..565H"><span id="translatedtitle">Sliding Friction at Compressed Ta/<span class="hlt">Al</span> Interfaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hammerberg, J. E.; Ravelo, R.; Germann, T. C.; Kress, J. D.; Holian, B. L.</p> <p>2004-07-01</p> <p>The physics of sliding at compressed Ta/<span class="hlt">Al</span> interfaces is discussed based upon the results of large scale 3D NEMD simulations. A new set of Embedded Atom Method potentials has been constructed to treat the Ta-<span class="hlt">Al</span> interaction. Pressures of order 15 GPa are studied and the velocity dependence of the frictional force is studied for several interfacial configurations including <span class="hlt">Al</span>(100)/Ta(100) and <span class="hlt">Al</span>(111)/Ta(110). Generic behavior is observed, characterized by a linear increase at low velocities followed by a power law decrease at high velocities associated with near interface structural transformation in <span class="hlt">Al</span>.</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://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://www.osti.gov/scitech/servlets/purl/108179','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/108179"><span id="translatedtitle">Beam lifetime and beam brightness in <span class="hlt">ALS</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kim, C.; Jackson, A.; Warwick, A.</p> <p>1995-04-01</p> <p>Beam lifetime in <span class="hlt">ALS</span> is dominated by the Touschek scattering. Measurements of lifetime in single-bunch mode with estimates of bunch dimensions obtained from undulator radiation data are consistent with expectations (t=1.8 hours at 1.25 mA per bunch). However, the lifetime is significantly longer in multi-bunch mode (t=ll hours at 400 mA per 320 bunches). This discrepancy has been traced to an increase in the momentum spread and bunch length in the beam caused by longitudinal coupled-bunch motions driven by higher-order modes in the rf cavities. The increased momentum spread leads to a significant degradation in the undulator spectral performance. Feedback stabilization of the coupled-bunch motion improves the spectral characteristics of the undulator beam at the expense of beam lifetime. We observe an increase of {approximately}200% in beam lifetime by operating at the betatron coupling resonance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/19417280','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/19417280"><span id="translatedtitle">Single-crystal <span class="hlt">Al</span>N nanonecklaces.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wang, Huatao; Xie, Zhipeng; Wang, Yiguang; Yang, Weiyou; Zeng, Qingfeng; Xing, Feng; An, Linan</p> <p>2009-01-14</p> <p>Distinct single-crystal aluminum nitride nanonecklaces with uniform [1011] 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 [1011] facets is due to the presence of a liquid phase that lowers the surface tension of otherwise high-energy [1011] 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. PMID:19417280</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 μm 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://adsabs.harvard.edu/abs/1982JAP....53.2368G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1982JAP....53.2368G"><span id="translatedtitle">Magnetic viscosity in Mn<span class="hlt">Al</span>C</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gaunt, P.; Kenning, G.; Ram, U. S.</p> <p>1982-03-01</p> <p>Magnetic viscosity has been measured in aged Mn<span class="hlt">Al</span>C alloys having an intrinsic coercive force of 1.44 kOe at 295 K rising to 1.97 kOe at 77 K. The measurements are used to estimate the derivative (∂E/∂H) of the activation energy E which must be supplied thermally to move segments of domain wall through coherent jumps. This derivative is found to vary linearly with the reciprocal of the effective applied field. These results are consistent with a domain wall pinning model which allows a range parameter 4b to be deduced, from the viscosity results, as 44 Å. This result is close to the estimated wall width of 49 Å.</p> </li> <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>2016-02-01</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 NO(3)(-) 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, NO(3)(-), 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/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://adsabs.harvard.edu/abs/2009MS%26E....4a2006S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009MS%26E....4a2006S"><span id="translatedtitle">Tribological properties of thermally sprayed Ti<span class="hlt">Al-Al</span>2O3 composite coating</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Salman, A.; Gabbitas, B.; Li, J.; Zhang, D.</p> <p>2009-08-01</p> <p>The use of thermal spray coatings provides protection to the surfaces operating in severe environments. The main goal of the current work is to investigate the possibility of using a high velocity oxy fuel (HVOF) thermally sprayed wear resistant Ti<span class="hlt">Al/Al</span>2O3 coating on tool steel (H13) which is used for making dies for aluminium high pressure die casting. A feedstock of Ti<span class="hlt">Al/Al</span>2O3 composite powder was produced from a mixture of <span class="hlt">Al</span> and TiO2 powders by high energy mechanical milling, followed by a thermal reaction process. The feedstock was then thermally sprayed using a high velocity oxy-fuel (HVOF) technique onto H13 steel substrates to produce a composite coating. The present study describes and compares the tribological properties such as friction and sliding wear rate of the coating both at room and high temperature (700°C). The results showed that the composite coating has lower wear rate at high temperature (700°C) than the uncoated H13 sample. At Room temperature without using lubricant there is no much significant difference between the wear rate of the coated and uncoated samples. The experimental results showed that the composite coating has great potential for high temperature application due to its lower wear rate at high temperature in comparison with the uncoated sample at the same temperature. The composite coating was characterized using scanning electron microscopy (SEM), optical microscopy and X-ray diffractometry (XRD). This paper reports the experimental observations and discusses the wear resistance performance of the coatings at room and high temperatures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/27093557','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27093557"><span id="translatedtitle">Surface Energy and Work Function Control of <span class="hlt">AlOx/Al</span> Surfaces by Fluorinated Benzylphosphonic Acids.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Abraham, Ffion; Ford, William E; Scholz, Frank; Nelles, Gabriele; Sandford, Graham; von Wrochem, Florian</p> <p>2016-05-11</p> <p>The performance of organic electronic devices can be significantly improved by modifying metal electrodes with organic monolayers, which alter the physical and chemical nature of the interface between conductor and semiconductor. In this paper we examine a series of 12 phosphonic acid compounds deposited on the native oxide layer of aluminum (<span class="hlt">AlOx/Al</span>), an electrode material with widespread applications in organic electronics. This series includes dodecylphosphonic acid as a reference and 11 benzylphosphonic acids, seven of which are fluorinated, including five newly synthesized derivatives. The monolayers are experimentally characterized by contact angle goniometry and by X-ray photoemission spectroscopy (XPS), and work function data obtained by low-intensity XPS are correlated with molecular dipoles obtained from DFT calculations. We find that monolayers are formed with molecular areas ranging from 17.7 to 42.9 Å(2)/molecule, and, by the choice of appropriate terminal groups, the surface energy can be tuned from 23.5 mJ/m(2) to 70.5 mJ/m(2). Depending on the number and position of fluorine substituents on the aromatic rings, a variation in the work function of <span class="hlt">AlOx/Al</span> substrates over a range of 0.91 eV is achieved, and a renormalization procedure based on molecular density yields a surprising agreement of work function changes with interface dipoles as expected from Helmholtz' equation. The ability to adjust energetics and adhesion at organic semiconductor/<span class="hlt">Al</span>Ox interfaces has immediate applications in devices such as OLEDs, OTFTs, organic solar cells, and printed organic circuits. PMID:27093557</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/6294055','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/6294055"><span id="translatedtitle">Formation of Nb/sub 3/<span class="hlt">Al</span> in powder processed Nb-<span class="hlt">Al</span> superconductors</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Johnson, P.E.</p> <p>1987-05-01</p> <p>In high magnetic fields, the critical current density is strongly dependent on the upper critical field, which is determined primarily by the stoichiometry of the Nb/sub 3/<span class="hlt">Al</span>. The critical temperature (T/sub c/), like the upper critical field, is considered to be a measure of the ''intrinsic'' quality of the superconductor, indicating the stoichiometry, order, and strain. If the A15 phase is stoichiometric and well ordered, a high T/sub c/ (and high H/sub C/sub 2//) is expected, regardless of the volume fraction of superconductor. On the other hand, if sigma phase is present with the A15, the resultant composition gradient across the sigma-A15 interface(s) requires that some of the A15 be off-stoichiometric, and therefore that the T/sub c/ (and H/sub C/sub 2//) be low. Thus the extent of the A15 (Nb/sub 3/<span class="hlt">Al</span>) reaction and the quality of the A15 formed are interdependent. This work focuses on the factors that control the extent of Nb/sub 3/<span class="hlt">Al</span> formation in Nb/<span class="hlt">Al</span> powder wires. The morphology and content of the reacted and unreacted wires are studied in optical, SEM, and TEM micrographs. Critical current density data and its dependence on processing are explained in terms of the unreacted microstructure and its effect on the extent of Nb/sub 3/<span class="hlt">Al</span> formation. As a method of improving the critical current density, a new variation of the conventional powder process for wire manufacturing is developed and tested.</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.ncbi.nlm.nih.gov/pubmed/27221345','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/27221345"><span id="translatedtitle">The immiscibility of In<span class="hlt">Al</span>N ternary alloy.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zhao, Guijuan; Xu, Xiaoqing; Li, Huijie; Wei, Hongyuan; Han, Dongyue; Ji, Zesheng; Meng, Yulin; Wang, Lianshan; Yang, Shaoyan</p> <p>2016-01-01</p> <p>We have used two models based on the valence force field and the regular solution model to study the immiscibility of In<span class="hlt">Al</span>N ternary alloy, and have got the spinodal and binodal curves of In<span class="hlt">Al</span>N. Analyzing the spinodal decomposition curves, we obtain the appropriate concentration region for the epitaxial growth of the InN-<span class="hlt">Al</span>N pseudobinary alloy. At a temperature most common for the epitaxial growth of In<span class="hlt">Al</span>N (1000 K), the solubility of InN is about 10%. Then we introduce the mismatch strain item into the Gibbs free energy, and the effect of different substrates is taken into consideration. Considering Si, <span class="hlt">Al</span>2O3, InN, GaN, <span class="hlt">Al</span>N as a substrate respectively, it is found that all the five systems are stabilized with the upper critical solution temperature largely reduced. Finally, InN and GaN are potential substrates for In-rich In<span class="hlt">Al</span>N, while <span class="hlt">Al</span>N and GaN substrates are recommended in the <span class="hlt">Al</span>-rich region. Si and <span class="hlt">Al</span>2O3 may be ideal substrates for thin In<span class="hlt">Al</span>N film. PMID:27221345</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>... Huthaifah <span class="hlt">al</span>-Yemeni, also known as Abu Huthaifah <span class="hlt">al</span>-Abu <span class="hlt">al</span>-Bara', also known as Fahd Muhammad Ahmad <span class="hlt">al</span>-Kusso...-Abu <span class="hlt">al</span>-Bara', also known as Fahd Muhammad Ahmad <span class="hlt">al</span>-Kusso, committed, or poses a significant risk...</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/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://www.osti.gov/scitech/biblio/603874','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/603874"><span id="translatedtitle">On creep behavior in powder metallurgy 6061 <span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mohamed, F.A.</p> <p>1998-01-06</p> <p>There has been a considerable interest in studying the creep characteristics of powder metallurgy (PM) <span class="hlt">Al</span> alloys such as PM 6061 <span class="hlt">Al</span> and PM 2124 <span class="hlt">Al</span>. First, these alloys have been used as matrices in the development of discontinuous SiC-<span class="hlt">Al</span> composites which have been under consideration as attractive materials for high temperature applications. Second, creep data on these alloys can be used not only to characterize the elevated temperature mechanical behavior of SiC-<span class="hlt">Al</span> composites in terms of deformation mechanisms but also to provide a close comparison between the creep strength of a composite and its unreinforced matrix alloy. Such a comparison under similar experimental conditions may determine whether the composite is more creep resistant than the alloy. The purpose of this note is to examine the experimental results reported for PM 6061 <span class="hlt">Al</span> in the light of the advances that have been made in rationalizing the creep behavior of <span class="hlt">Al</span>-based solid-solution alloys.</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> </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://www.osti.gov/scitech/biblio/941089','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/941089"><span id="translatedtitle">Appearance of the Bulk Motif in <span class="hlt">Al</span> Clusters</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Jiao Sun; Wen-Cai Lu; Ze-Sheng Li; C.Z. Wang; K.M. Ho</p> <p>2008-07-07</p> <p>We have performed an unbiased search for the lowest-energy structures of medium-sized aluminum clusters <span class="hlt">Al</span>{sub n} (n=19-26) using a genetic algorithm (GA) coupled with a tight-binding interatomic potential. Structural candidates obtained from our GA search were further optimized using density functional theory. It is found that the double icosahedron is not the most stable structure for <span class="hlt">Al</span>{sub 19} but serves as the core for <span class="hlt">Al</span>{sub 20} and <span class="hlt">Al</span>{sub 21}. The lowest-energy structures of <span class="hlt">Al</span>{sub n} are found to undergo a transition to an aluminum bulk motif above <span class="hlt">Al</span>{sub 23}. In particular, the lowest-energy structure of <span class="hlt">Al</span>{sub 26} is almost a fragment of the bulk face-centered-cubic crystal except for the stacking fault at the bottom layer. Anion clusters were also studied.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/18624496','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/18624496"><span id="translatedtitle">Appearance of the bulk motif in <span class="hlt">Al</span> clusters.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Sun, Jiao; Lu, Wen-Cai; Li, Ze-Sheng; Wang, C Z; Ho, K M</p> <p>2008-07-01</p> <p>We have performed an unbiased search for the lowest-energy structures of medium-sized aluminum clusters <span class="hlt">Al</span>(n) (n=19-26) using a genetic algorithm (GA) coupled with a tight-binding interatomic potential. Structural candidates obtained from our GA search were further optimized using density functional theory. It is found that the double icosahedron is not the most stable structure for <span class="hlt">Al</span>(19) but serves as the core for <span class="hlt">Al</span>(20) and <span class="hlt">Al</span>(21). The lowest-energy structures of <span class="hlt">Al</span>(n) are found to undergo a transition to an aluminum bulk motif above <span class="hlt">Al</span>(23). In particular, the lowest-energy structure of <span class="hlt">Al</span>(26) is almost a fragment of the bulk face-centered-cubic crystal except for the stacking fault at the bottom layer. Anion clusters were also studied. PMID:18624496</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.osti.gov/scitech/biblio/21020874','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21020874"><span id="translatedtitle">Thermal stability of sputtered intermetallic <span class="hlt">Al</span>-Au coatings</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Moser, M.; Mayrhofer, P. H.; Ross, I. M.; Rainforth, W. M.</p> <p>2007-09-15</p> <p>Recently, the authors have shown that single-phase <span class="hlt">Al</span>{sub 2}Au coatings, prepared by unbalanced magnetron sputtering, exhibit a dense columnar structure and highest hardness and indentation moduli of 8 and 144 GPa, respectively, within the <span class="hlt">Al</span>-Au films investigated. This study focuses on the thermal stability of <span class="hlt">Al</span>{sub 2}Au with respect to films containing more <span class="hlt">Al</span> and Au having <span class="hlt">Al</span>/Au at. % ratios of 4.32 and 1.85, respectively. Single-phase <span class="hlt">Al</span>{sub 2}Au has the highest onset temperature for recovery of 475 deg. C and recrystallization of 575 deg. C. Upon annealing Au- and <span class="hlt">Al</span>-rich films, their stresses deviate from the linear thermoelastic behavior at temperatures (T) above 200 and 450 deg. C, respectively, due to pores and metallic phases present. Metastable Au within the as-deposited Au-rich film is consumed by the growing intermetallic <span class="hlt">Al</span>Au and <span class="hlt">Al</span>Au{sub 2} phases at T{>=}450 deg. C, which themselves melt at {approx}625 deg. C. Due to nanometer scale segregations of <span class="hlt">Al</span>, encapsulated by <span class="hlt">Al</span>{sub 2}Au in <span class="hlt">Al</span>-rich coatings, their melting point is reduced by {approx}85 deg. C to 575 deg. C. Dynamic thermal analyses up to 1100 deg. C in synthetic air reveal the single-phase <span class="hlt">Al</span>{sub 2}Au films with a superior thermal stability and only negligible oxidation. At 750 deg. C, the mass gain is {approx}1.5 mg/cm{sup 2} after 50 h isothermal exposure. Based on the investigations, the authors can conclude that single-phase intermetallic <span class="hlt">Al</span>{sub 2}Au films have a high potential for oxidation protection of sensitive materials.</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/2013BAAA...56..215L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013BAAA...56..215L"><span id="translatedtitle"><span class="hlt">Analisis</span> evolutivo del cumulo abierto NGC2527</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lovos, F.; Gonzalez, J. F.; Veramendi, M. E.</p> <p></p> <p>We present a spectroscopic analysis of 13 (V ) stars in the open cluster NGC2527. We carried out a study of radial velocity variability and kinematic membership. We detected three double-lined spectroscopic binaries; two of which are cluster members. One of the binaries is a blue straggler; for which we discuss possible formation scenarios. We conclude that this system would have been formed dynamically through a binary-binary or binary-single encounter; being the blue straggler the result of the merger of the companions of the original binary. FULL TEXT IN SPANISH</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://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://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://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.osti.gov/scitech/servlets/purl/10192034','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10192034"><span id="translatedtitle">The electrochemical behavior of the <span class="hlt">Al</span>{sub 3}Fe intermetallic compound and localized corrosion of impure 1100 <span class="hlt">Al</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Buchheit, R.G.; Maestas, L.M.; Sorensen, N.R.</p> <p>1993-11-01</p> <p>Pitting of 1100 <span class="hlt">Al(Al</span>-1.0(Fe,Cu,Si)) due to <span class="hlt">Al</span>{sub 3}Fe constituent particles has been studied by examining a variety of intrinsic, extrinsic, and environmental factors that contribute to localized corrosion. Consistent with results from other studies, <span class="hlt">Al</span>{sub 3}Fe is noble with respect to its microstructural surroundings and pitting is localized to the particle periphery. Polarization curves indicate that cathodic electron transfer reactions are supported on <span class="hlt">Al</span>{sub 3}Fe at high rates, however, a anodic electron transfer reactions are not. Interparticle spacing appears to play a strong role in determining where pitting will occur, while <span class="hlt">Al</span>{sub 3}Fe particle area plays a lesser role. Solution pH, applied potential, and exposure time each have measurable effects on the electrochemical behavior of <span class="hlt">Al</span>{sub 3}Fe and the {alpha}-<span class="hlt">Al</span> matrix phase which can impact either the galvanic potential of the <span class="hlt">Al</span>{sub 3}Fe/{alpha}-<span class="hlt">Al</span> couple, or charge transfer processes on <span class="hlt">Al</span>{sub 3}Fe particles.</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.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/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.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://www.osti.gov/scitech/biblio/22089639','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22089639"><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://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kaun, Stephen W.; Burke, Peter G.; Kyle, Erin C. H.; Speck, James S.; Wong, Man Hoi; Mishra, Umesh K.</p> <p>2012-12-24</p> <p><span class="hlt">Al</span>{sub x}Ga{sub 1-x}N/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 {approx}2 Multiplication-Sign 10{sup 10}, {approx}5 Multiplication-Sign 10{sup 8}, and {approx}5 Multiplication-Sign 10{sup 7} cm{sup -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/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://www.osti.gov/scitech/biblio/40203897','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/40203897"><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://www.osti.gov/scitech">SciTech Connect</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{emdash}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. {copyright} 2001 American Institute of Physics.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JaJAP..55eFJ06I','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JaJAP..55eFJ06I"><span id="translatedtitle">Investigation of amber light-emitting diodes based on InGaN/<span class="hlt">AlN/Al</span>GaN 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>Iida, Daisuke; Lu, Shen; Hirahara, Sota; Niwa, Kazumasa; Kamiyama, Satoshi; Ohkawa, Kazuhiro</p> <p>2016-05-01</p> <p>We investigated InGaN-based amber light-emitting diodes (LEDs) with <span class="hlt">AlN/(Al</span>)GaN barrier layers grown by metalorganic vapor-phase epitaxy. Tensilely strained <span class="hlt">AlN/Al</span>0.03Ga0.97N barriers improved the crystalline quality of compressively strained InGaN quantum wells. We found that strain compensation among wells and barriers improves the external quantum efficiency of high-In-content InGaN-based amber LEDs. The amber LEDs with <span class="hlt">AlN/Al</span>0.03Ga0.97N barriers have shown an electroluminescence (EL) intensity approximately 2.5-fold that of LEDs with the <span class="hlt">Al</span>N/GaN barriers at 20 mA.</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://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/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://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 (Λ) 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 Λ = 25 nm (100 bilayers). At these conditions, the maximum polarization resistance (1719.32 kΩ cm2) and corrosion rate (0.7 μmy) were 300 and 35 times higher than that of uncoated AISI D3 steel substrate (5.61 kΩ cm2 and 25 μmy, 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://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/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://adsabs.harvard.edu/abs/2016MMTB..tmp..121A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016MMTB..tmp..121A"><span id="translatedtitle">Intermetallic Phase Formation in Explosively Welded <span class="hlt">Al</span>/Cu Bimetals</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Amani, H.; Soltanieh, M.</p> <p>2016-05-01</p> <p>Diffusion couples of aluminum and copper were fabricated by explosive welding process. The interface evolution caused by annealing at different temperatures and time durations was investigated by means of optical microscopy, scanning electron microscopy equipped with energy dispersive spectroscopy, and x-ray diffraction. Annealing in the temperature range of 573 K to 773 K (300 °C to 500 °C) up to 408 hours showed that four types of intermetallic layers have been formed at the interface, namely <span class="hlt">Al</span>2Cu, <span class="hlt">Al</span>Cu, <span class="hlt">Al</span>3Cu4, and <span class="hlt">Al</span>4Cu9. Moreover, it was observed that iron trace in aluminum caused the formation of Fe-bearing intermetallics in <span class="hlt">Al</span>, which is near the interface of the <span class="hlt">Al</span>-Cu intermetallic layers. Finally, the activation energies for the growth of <span class="hlt">Al</span>2Cu, <span class="hlt">Al</span>Cu + <span class="hlt">Al</span>3Cu4, <span class="hlt">Al</span>4Cu9, and the total intermetallic layer were calculated to be about 83.3, 112.8, 121.6, and 109.4 kJ/mol, respectively. Considering common welding methods (i.e., explosive welding, cold rolling, and friction welding), although there is a great difference in welding mechanism, it is found that the total activation energy is approximately the same.</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/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> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JCrGr.441..107G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JCrGr.441..107G"><span id="translatedtitle">Radial macrosegregation and dendrite clustering in directionally solidified <span class="hlt">Al</span>-7Si and <span class="hlt">Al</span>-19Cu alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ghods, M.; Johnson, L.; Lauer, M.; Grugel, R. N.; Tewari, S. N.; Poirier, D. R.</p> <p>2016-05-01</p> <p>Hypoeutectic <span class="hlt">Al</span>-7 wt% Si and <span class="hlt">Al</span>-19 wt% Cu alloys were directionally solidified upward in a Bridgman furnace through a range of constant growth speeds and thermal gradients. Though processing is thermo-solutally stable, flow initiated by gravity-independent advection at, slightly leading, central dendrites moves rejected solute out ahead and across the advancing interface. Here any lagging dendrites are further suppressed which promotes a curved solid-liquid interface and the eventual dendrite "clustering" seen in transverse sections (dendrite "steepling" in longitudinal orientations) as well as extensive radial macrosegregation. Both aluminum alloys showed considerable macrosegregation at the low growth speeds (10 and 30 μm s-1) but not at higher speed (72 μm s-1). Distribution of the fraction eutectic-constituent on transverse sections was determined in order to quantitatively describe radial macrosegregation. The convective mechanisms leading to dendrite-steepling were elucidated with numerical simulations, and their results compared with the experimental observations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012SuMi...51..809M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012SuMi...51..809M"><span id="translatedtitle">Chemical shielding properties for BN, BP, <span class="hlt">Al</span>N, and <span class="hlt">Al</span>P nanocones: DFT studies</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mirzaei, Mahmoud; Yousefi, Mohammad; Meskinfam, Masoumeh</p> <p>2012-06-01</p> <p>The properties of boron nitride (BN), boron phosphide (BP), aluminum nitride (<span class="hlt">Al</span>N), and aluminum phosphide (<span class="hlt">Al</span>P) nanocones were investigated by density functional theory (DFT) calculations. The investigated structures were optimized and chemical shielding (CS) properties including isotropic and anisotropic CS parameters were calculated for the atoms of the optimized structures. The magnitudes of CS parameters were observed to be mainly dependent on the bond lengths of considered atoms. The results indicated that the atoms could be divided into atomic layers due to the similarities of their CS properties for the atoms of each layer. The trend means that the atoms of each layer detect almost similar electronic environments. Moreover, the atoms at the apex and mouth of nanocones exhibit different properties with respect to the other atomic layers.</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://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 Youngs 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://adsabs.harvard.edu/abs/2007APS..MARU22007H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007APS..MARU22007H"><span id="translatedtitle">High velocity sliding at a compressed <span class="hlt">Al</span>(111)/<span class="hlt">Al</span>(100) interface</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hammerberg, J. E.; Ravelo, R.; Germann, T. C.; Holian, B. L.</p> <p>2007-03-01</p> <p>We discuss high velocity sliding at a compressed <span class="hlt">Al</span>(111)/<span class="hlt">Al</span>(100) interface sliding in the 110 direction at a pressure of 15 GPa. Three temperatures are considered, T=232, 464 and 696 K. System sizes are 1.4 10^6 atoms .We find that for velocities above a critical velocity, vc, the frictional force scales as (v/vc)^-β with β 3/4. We discuss the temperature and size dependence of vc. We find that below vc the frictional force is an increasing function of velocity with an initial linear dependence. Above vc there is a regime of interfacial instability characterized by a (100) transformation front moving into the (111) material. This is followed by a fluid regime for which a Couette flow profile develops at the interface, the thickness of which grows with increasing velocity.</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/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/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://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> </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/2001APS..MARY17003R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2001APS..MARY17003R"><span id="translatedtitle">Dispersing Electronic States in d-<span class="hlt">Al</span>NiCo and i-<span class="hlt">Al</span>PdMn Quasicrystals</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rotenberg, Eli</p> <p>2001-03-01</p> <p>A basic question about the nature of the valence electronic states -- whether they are extended as in periodic crystals, or localized as in amorphous materials -- remains largely unanswered for quasicrystals. To address this question, we directly measured the momentum (k-) dependent distribution of the electronic states using high-resolution, k-resolved photoemission measurements of quasicrystals at the Advanced Light Source in Berkeley, CA. We present results for both s-p- and d-bands of decagonal <span class="hlt">Al</span>NiCo (for 10-fold and two principal 2-fold surfaces), and compare the dispersion of the states in the periodic and aperiodic directions. The electronic states were found to strongly disperse in both these directions, with periodic and aperiodic character, respectively. The effective mass of some of these states approaches m*=1, indicating a high degree of delocalization. Renderings of the constant energy surfaces in 3-dimensional k-space show that the s-p bands have spherical energy surfaces emanating from the locations of the strongest in-plane diffraction spots. This supports a nearly-free electron picture in quasicrystals, whereby the strongest Fourier components of the atomic potential contribute most significantly to the momentum distribution of electronic states, and define a pseudo-Brillouin zone. The d-bands were also found to have a delocalized character within the aperiodic plane. These delocalized d-bands cross the Fermi level and so form a well-defined Fermi surface. Similar states were found for icosahedral <span class="hlt">Al</span>PdMn 5-fold surfaces as well. Since all relevant properties of metals derive from the detailed topology of the Fermi surface, these results should have immediate bearing on the properties of decagonal <span class="hlt">Al</span>NiCo and icosahedral <span class="hlt">Al</span>PdMn in particular, and quasicrystals in general.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015APS..MARQ25010H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015APS..MARQ25010H"><span id="translatedtitle">Frictional sliding at a compressed polycrystalline 50 nm grain size <span class="hlt">Al-Al</span> interface</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hammerberg, J. E.; Ravelo, R. J.; Germann, T. C.</p> <p>2015-03-01</p> <p>We present the results of large-scale NEMD simulations for a polycrystalline <span class="hlt">Al-Al</span> interface sliding at a relative velocity of 60 m/s and a pressure of 15 GPa with a boundary temperature of 300K. The sample consisted of annealed grains, 125 grains on either side of the initial sliding interface, with dimensions of 2x(236) nm in the normal direction and 236 nm in the periodic sliding and transverse directions. Simulation times were of order 20 ns and the sample had 1.8B atoms interacting with an <span class="hlt">Al</span>-EAM potential. The initial grain structure evolves to a complex dynamic steady state grain morphology that is very different from the initial grain structure and is characterized by large plastic strains and strain rates in a deformation region of thickness 150 nm at the interface in the normal direction. The steady state shows a sequence of grain growth and refinement and a highly strained graded microstructure. This behavior is similar to that seen in simulations for 13 and 20 nm grains and a mesoscale model that takes into account the large plastic strains and strain rates, and the size of the deformation region is able to reproduce the values of the frictional force per unit area. This work was performed under the auspices of the U.S. Dept. of Energy under Contract DE-AC52-06NA25396. The support of the LANL ASC-PEM program is gratefully acknowledged.</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://www.osti.gov/scitech/biblio/21516720','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21516720"><span id="translatedtitle">Roll Casting of <span class="hlt">Al</span>-25%Si</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Haga, Toshio; Harada, Hideto; Watari, Hisaki</p> <p>2011-05-04</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 {mu}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> <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/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://www.osti.gov/scitech/servlets/purl/491584','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/491584"><span id="translatedtitle">Ion instability experiments on the <span class="hlt">ALS</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Byrd, J.M.; Thomson, J.; Chao, A.W.; Heifets, S.; Minty, M.G.; Seeman, J.T.; Stupakov, G.V.; Zimmermann, F.; Raubenheimer, T.O.</p> <p>1996-12-01</p> <p>The authors report the results of experiments to study ion effects at the Advanced Light Source (<span class="hlt">ALS</span>) in two pressure regimes. At the nominal pressure of 0.25 nTorr, they observe small vertical coherent beam oscillations for the nominal filling pattern (2.5% gap) that correlate with the expected ion frequency for nitrogen or carbon monoxide. The signals disappear for larger gaps in the filling pattern. They observe little increase in vertical beam size. They have also made experiments to look for unconventional ion effects at elevated gas pressures that may be important for future accelerators. In these experiments, they introduce a single gas species (helium) into the storage ring, raising the pressure approximately two orders of magnitude above the nominal pressure. For filling patterns with gaps in the bunch train large enough that conventional ion trapping should not play a role, they observe roughly a doubling of the vertical beam size along with coherent beam oscillations. They compare the results of the experiments with the predictions of one possible mechanism: the fast beam-ion instability.</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://adsabs.harvard.edu/abs/1998MMTA...29..937G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1998MMTA...29..937G"><span id="translatedtitle">Coherency stresses in lamellar Ti-<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>Grinfeld, M. A.; Hazzledine, P. M.; Shoykhet, B.; Dimiduk, D. M.</p> <p>1998-03-01</p> <p>General formulas are given for the coherency strains and stresses in a multilayer far from the free surfaces. The multilayer is assumed to be a periodic stack of different elastically isotropic materials, but there may be any number of layers in the stack and they may each have any thickness and any elastic constants. The results are applied to lamellar Ti-<span class="hlt">Al</span> alloys, in which there are shear misfits between different γ layers and both shear and biaxial misfits between the γ and α2 layers. In a fully coherent multilayer, the stresses would be large, in the GPa range, and in high strength, thin lamella alloys, the coherency stresses are a substantial fraction of a GPa. The shear stresses act principally on hard mode deformation systems, and the biaxial stresses place every α2 lamella in biaxial compression. This biaxial compression, which, for dislocation glide, is equivalent to a uniaxial tension normal to the lamella, is particularly large when the α2 volume fraction is small.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3299873','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3299873"><span id="translatedtitle">A Monoclonal Antibody Specific for Candida albicans <span class="hlt">Als</span>4 Demonstrates Overlapping Localization of <span class="hlt">Als</span> Family Proteins on the Fungal Cell Surface and Highlights Differences between <span class="hlt">Als</span> Localization in vitro and in vivo</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Coleman, David A.; Oh, Soon-Hwan; Manfra-Maretta, Sandra L.; Hoyer, Lois L.</p> <p>2011-01-01</p> <p>The Candida albicans <span class="hlt">ALS</span> (agglutinin-like sequence) family encodes large cell-surface glycoproteins that function in adhesion of the fungus to host and abiotic surfaces. Monoclonal antibodies (mAbs) specific for each <span class="hlt">Als</span> protein were developed to study <span class="hlt">Als</span> localization on the C. albicans surface. An anti-<span class="hlt">Als</span>4 mAb demonstrated that <span class="hlt">Als</span>4 covers the surface of yeast cells, with a greater abundance of <span class="hlt">Als</span>4 on cells grown at 30°C compared to 37°C. On germ tubes, <span class="hlt">Als</span>4 is localized in a restricted area proximal to the mother yeast. Immunolabeling with several anti-<span class="hlt">Als</span> mAbs showed overlapping localization of <span class="hlt">Als</span>1 and <span class="hlt">Als</span>4 on yeast cells and <span class="hlt">Als</span>1, <span class="hlt">Als</span>3 and <span class="hlt">Als</span>4 on germ tubes. Overlapping localization of <span class="hlt">Als</span> proteins was also observed on yeast and hyphae recovered from mouse models of disseminated and oral candidiasis. Differences between <span class="hlt">Als</span> localization in vivo and in vitro suggested changes in regulation of <span class="hlt">Als</span> production in the host compared to the culture flask. Characterization with the anti-<span class="hlt">Als</span> mAbs reveals the simultaneous presence and differences in relative abundance of <span class="hlt">Als</span> proteins, creating an accurate image of <span class="hlt">Als</span> representation and localization that can be used to guide conclusions regarding individual and collective <span class="hlt">Als</span> protein function. PMID:22106872</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/1991JaJAP..30.1571H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1991JaJAP..30.1571H"><span id="translatedtitle">Mechanism of Corrosion in <span class="hlt">Al</span>-Si-Cu</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hayasaka, Nobuo; Koga, Yuri; Shimomura, Koji; Yoshida, Yukimasa; Okano, Haruo</p> <p>1991-07-01</p> <p>An <span class="hlt">Al</span>-Cu local cell was formed between the Cu precipitation and adjacent <span class="hlt">Al</span> in an <span class="hlt">Al</span>-Si-Cu alloy when Cu was added in excess to the alloy. Once an <span class="hlt">Al</span>-Cu local cell was formed, corrosion took place simply by dipping the alloy in deionized water without any contamination. Furthermore, it was found that corrosion was enhanced at the <span class="hlt">Al</span>-Si-Cu lines in contact with the p+-n junction of Si. The reason for this is that holes are injected into <span class="hlt">Al</span>-Si-Cu from p+-Si due to electromotive force produced by light irradiation and an external circuit connecting the alloy and n-Si formed by the adsorption of moisture on the surface. Furthermore, it was found that the irradiation of light with a wavelength between 320 to 380 nm was most effective in enhancing the corrosion reaction.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/983100','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/scitech/servlets/purl/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; Reedy, Robert</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://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.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://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://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> <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/909992','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/909992"><span id="translatedtitle">Probing the Structure and Bonding in <span class="hlt">Al</span>6N- and <span class="hlt">Al</span>6N by Photoelectron Spectroscopy and Ab Initio Calculations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Averkiev, Boris B.; Boldyrev, Alexander I.; Li, Xi; Wang, Lai S.</p> <p>2007-01-11</p> <p>The electronic and geometrical structure of a nitrogen-doped <span class="hlt">Al</span>6 - cluster (<span class="hlt">Al</span>6N-) is investigated using photoelectron spectroscopy and ab initio calculations. Photoelectron spectra of <span class="hlt">Al</span>6N- have been obtained at three photon energies with seven resolved spectral features. The electron affinity of <span class="hlt">Al</span>6N has been determined to be 2.58 (0.04 eV. Global minimum structure searches for A6N- and its corresponding neutral form are performed using several theoretical methods. Vertical electron detachment energies, calculated using three different methods for the lowest energy structure and a low-lying isomer, are compared with the experimental data. The ground-state structure of <span class="hlt">Al</span>6N- is established from the joint experimental and theoretical study to consist of an <span class="hlt">Al</span>2 dimer bonded to the top of a quasi-planar tetracoordinated N unit, <span class="hlt">Al</span>4N-, or it can be viewed as a distorted trigonal prism structure with the N atom bonded in one of the prism faces. For neutral <span class="hlt">Al</span>6N, three low-lying isomers are found to compete for the global minimum, two of which are built from the tetracoordinated <span class="hlt">Al</span>4N unit. The chemical bonding in <span class="hlt">Al</span>6N- is discussed on the basis of molecular orbital and natural bond analyses.</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> </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://adsabs.harvard.edu/abs/2016ChPhB..25d3101R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016ChPhB..25d3101R"><span id="translatedtitle">Ab initio study on the electronic states and laser cooling of <span class="hlt">Al</span>Cl and <span class="hlt">Al</span>Br</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rong, Yang; Bin, Tang; Tao, Gao</p> <p>2016-04-01</p> <p>We investigate whether <span class="hlt">Al</span>Cl and <span class="hlt">Al</span>Br are promising candidates for laser cooling. We report new ab initio calculations on the ground state X1Σ+ and two low-lying states (A1Π and a3Π) of <span class="hlt">Al</span>Cl and <span class="hlt">Al</span>Br. The calculated spectroscopic constants show good agreement with available theoretical and experimental results. We also obtain the permanent dipole moments (PDMs) curve at multi-reference configuration interaction (MRCI) level of theory. The transition properties of A1Π and a3Π states are predicted, including the transition dipole moments (TDMs), Franck–Condon factors (FCFs), radiative times and radiative width. The calculated radiative lifetimes are of the order of a nanosecond, implying that they are sufficiently short for rapid laser cooling. Both <span class="hlt">Al</span>Cl and <span class="hlt">Al</span>Br have highly diagonally distributed FCFs which are crucial requirement for molecular laser cooling. The results demonstrate the feasibility of laser cooling <span class="hlt">Al</span>Cl and <span class="hlt">Al</span>Br, and we propose laser cooling schemes for <span class="hlt">Al</span>Cl and <span class="hlt">Al</span>Br.</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/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 νQ ≊ 1.8MHz and asymmetry parameter η ≊ 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 νQ,A ≊ 1.53 MHz, and ηA ≊ 0.20 for the site A, and νQ,B ≊ 2.28 MHz, and ηB ≊ 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.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/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://adsabs.harvard.edu/abs/2001PhyB..308..110A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2001PhyB..308..110A"><span id="translatedtitle">Positron annihilation in <span class="hlt">Al</span>N and GaN</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Arutyunov, N. Yu.; Emtsev, V. V.; Mikhailin, A. V.; Davidov, V. Yu.</p> <p>2001-12-01</p> <p>The measurements of one-dimensional angular correlation of the annihilation radiation (1D-ACAR) have been carried out for <span class="hlt">Al</span>N and GaN as well as for some related materials (<span class="hlt">Al</span>, Ga, GaP, GaAs, GaSb) which have been used as samples of references the analysis of results. The numeral values of characteristic length of radius of spherical volume to be occupied by annihilating electron ( rs‧) have differed significantly from the corresponding values ( rs) calculated by the conventional independent-particle-model (IPM) for ideal Fermi-gas: rs‧ (<span class="hlt">Al</span>N)≃1.28 rs, where rs (<span class="hlt">Al</span>N)≃1.61 a.u., and rs‧ (GaN)≃1.66 rs, where rs (GaN)≃1.64 a.u. The electron-positron “ion radii” reconstructed by the high-momentum components (HMC) of 1D-ACAR for <span class="hlt">Al</span> 3+, Ga 3+ cores as well as numeral rs‧ values provide some reasons to believe that Ga- and <span class="hlt">Al</span>-vacancies and their impurity complexes are effective centers of the positron localization in <span class="hlt">Al</span>N and GaN; it is assumed that these complexes include V Ga, V <span class="hlt">Al</span>, and N atom (V Ga-N Ga in GaN and V <span class="hlt">Al</span>-N <span class="hlt">Al</span> in <span class="hlt">Al</span>N) where the nitrogen atom is likely to be in the configuration of substitution (anti-site), N +Ga and N +<span class="hlt">Al</span>, respectively.</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/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://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://adsabs.harvard.edu/abs/2000JAP....88.3988L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2000JAP....88.3988L"><span id="translatedtitle">Oxidation induced precipitation in <span class="hlt">Al</span> implanted epitaxial silicon</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>La Ferla, A.; Galvagno, G.; Giri, P. K.; Franzò, G.; Rimini, E.; Raineri, V.; Gasparotto, A.; Cali, D.</p> <p>2000-10-01</p> <p>The behavior of <span class="hlt">Al</span> implanted in silicon has been investigated during thermal oxidation. It has been found that precipitation of <span class="hlt">Al</span> into <span class="hlt">Al</span>-O-defect complexes depends on the implant energy, i.e., on the distance of the dopant from the surface. It occurs at 650 keV, but it does not at 2.0 MeV or higher energies. This phenomenon has been explained taking into account the diffusivity of self-interstitials introduced during oxidation, the oxygen present in the Si, the <span class="hlt">Al</span> concentration, and the annealing out of defects.</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/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> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21371677','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21371677"><span id="translatedtitle">Nb<span class="hlt">Al</span> Intelligent Material Through Mechanical Alloying</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Chinniah, K.; Aikra, K.</p> <p>2010-03-11</p> <p>An intelligent material of Nb-<span class="hlt">Al</span> composite, is expected to produce intermetallics phase instantaneously upon collision with hypervelocity space debris to stop the crack propagation. Intermetallics-free MA powder with Nb dispersion in <span class="hlt">Al</span> matrix is targeted. Nb-<span class="hlt">Al</span> powders are mechanically alloyed using agate media. Mechanical alloying (MA) with agate media produced fine intermetallics-free powder of Nb dispersion in <span class="hlt">Al</span> matrix. Intermetallics-free critical MA powder curve for agate media were established. The optimum critical agate MA powder of 200 rpm 132 hours had intelligent properties.</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://www.ncbi.nlm.nih.gov/pubmed/19444952','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/19444952"><span id="translatedtitle">Cystatin C in cerebrospinal fluid as a biomarker 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>Tsuji-Akimoto, Sachiko; Yabe, Ichiro; Niino, Masaaki; Kikuchi, Seiji; Sasaki, Hidenao</p> <p>2009-03-01</p> <p>Amyotrophic lateral sclerosis (<span class="hlt">ALS</span>) is diagnosed on the basis of progressive symptoms in both the upper and lower motor neurons. Because there are no specific biomarkers for <span class="hlt">ALS</span>, it is difficult to diagnose this disease in its early stages. Cerebrospinal fluid (CSF) samples were obtained from 14 patients in the early stages of <span class="hlt">ALS</span>, from 13 with polyneuropathy, and from 16 with other neurological disorders. The concentration of cystatin C in the CSF was measured using a sandwich enzyme-linked immunosorbent assay (ELISA) kit. The concentration of cystatin C in the CSF was significantly lower in <span class="hlt">ALS</span> patients than in the control subjects who were patients with polyneuropathy or other neurological diseases (patients with <span class="hlt">ALS</span>, polyneuropathy, and other diseases exhibited 5.5 +/- 0.3, 6.7 +/- 0.4, and 6.9 +/- 0.3 mg/L cystatin C, respectively; <span class="hlt">ALS</span> patients vs. control subjects: p = 0.014 and <span class="hlt">ALS</span> patients vs. polyneuropathy patients: p = 0.024). Cystatin C may be a useful biomarker of <span class="hlt">ALS</span> and can be used to distinguish between <span class="hlt">ALS</span> and polyneuropathy. PMID:19444952</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://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://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.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4858726','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4858726"><span id="translatedtitle">Rare and unusual clinicopathologic presentation of renal <span class="hlt">AL</span> amyloidosis</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Zuppan, Craig; Pi, Alexander; Zhang, Zhiwei; Jaipaul, Navin</p> <p>2016-01-01</p> <p>Lesson Rarely, renal light chain (<span class="hlt">AL</span>) amyloidosis may present without significant proteinuria owing to glomerular sparing and amyloid deposition confined to the vasculature and tubulointerstitium. PMID:27186381</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://www.osti.gov/scitech/biblio/988018','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/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/scitech">SciTech Connect</a></p> <p>Dr. Jarret Brachman</p> <p>2010-06-29</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://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://adsabs.harvard.edu/abs/2016JCrGr.440..110S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JCrGr.440..110S"><span id="translatedtitle">Comments on the papers recently published by Kalaivani et <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>Srinivasan, Bikshandarkoil R.; Narvekar, Kedar U.</p> <p>2016-04-01</p> <p>We argue that the so-called L-lysinium succinate 1 (Kalaivani et <span class="hlt">al</span>. (2015) [16], zinc chloride doped L-lysinium succinate 2 (Kalaivani et <span class="hlt">al</span>. (2015) [17], L-threonine phthalate 3 (Elberin Mary Theras et <span class="hlt">al</span>. (2015) [18] and sodium acetate doped L-tyrosine 4 (Arthi et <span class="hlt">al</span>. (2015) [19] are all dubious crystals. Taking compounds 1-4 as examples we show that EDAX is an inappropriate method for characterization of new materials based on elemental composition data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19830057375&hterms=Albuquerque+al&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3DAlbuquerque%2Bal.','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19830057375&hterms=Albuquerque+al&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3DAlbuquerque%2Bal."><span id="translatedtitle">Ca-<span class="hlt">Al</span>-rich chondrules and inclusions in ordinary chondrites</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bischoff, A.; Keil, K.</p> <p>1983-01-01</p> <p>Ca-<span class="hlt">Al</span>-rich objects, hitherto mostly found in carbonaceous chondrites, are shown to be widespread, albeit rare, constituents of type 3 ordinary chondrites. Widespread occurrence and textural similarities of Ca-<span class="hlt">Al</span>-rich chondrules to common, Mg-Fe-rich chondrules suggest that they formed by related processes. It is suggested in this article that Ca-<span class="hlt">Al</span>-rich chondrules were formed by total melting and crystallization of heterogeneous, submillimeter- to submillimeter-sized dustballs made up of mixtures of high-temperature, Ca-<span class="hlt">Al</span>-rich and lower-temperature, Na-K-rich components.</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.osti.gov/scitech/biblio/22472499','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22472499"><span id="translatedtitle">Microstructure of the <span class="hlt">Al</span>-La-Ni-Fe system</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Vasil’ev, A. L.; Ivanova, A. G.; Bakhteeva, N. D.; Kolobylina, N. N.; Orekhov, A. S.; Presnyakov, M. Yu.; Todorova, E. V.</p> <p>2015-01-15</p> <p>The microstructure of alloys based on the <span class="hlt">Al</span>-La-Ni-Fe system, which are characterized by a unique ability to form metal glasses and nanoscale composites in a wide range of compositions, has been investigated. <span class="hlt">Al</span>{sub 85}Ni{sub 7}Fe{sub 4}La{sub 4} and <span class="hlt">Al</span>{sub 85}Ni{sub 9}Fe{sub 2}La{sub 4} alloys have been analyzed by electron microscopy (including high-resolution scanning transmission electron microscopy), energy-dispersive X-ray microanalysis, electron diffraction (ED), and X-ray diffraction (XRD). It is found that, along with fcc <span class="hlt">Al</span> and <span class="hlt">Al</span>{sub 4}La (<span class="hlt">Al</span>{sub 11}La{sub 3}) particles, these alloys contain a ternary phase <span class="hlt">Al</span>{sub 3}Ni{sub 1−x}Fe{sub x} (sp. gr. Pnma) isostructural to the <span class="hlt">Al</span>{sub 3}Ni phase and a quaternary phase <span class="hlt">Al</span>{sub 8}Fe{sub 2−x}Ni{sub x}La isostructural to the <span class="hlt">Al</span>{sub 8}Fe{sub 2}Eu phase (sp. gr. Pbam). The unit-cell parameters of the <span class="hlt">Al</span>{sub 3}Ni{sub 1−x}Fe{sub x} and <span class="hlt">Al</span>{sub 8}Fe{sub 2−x}Ni{sub x}La compounds, determined by ED and refined by XRD, are a = 0.664(1) nm, b = 0.734(1) nm, and c = 0.490(1) nm for <span class="hlt">Al</span>{sub 3}Ni{sub 1−x}Fe{sub x} and a = 1.258(3) nm, b = 1.448(3) nm, and c = 0.405(8) nm for <span class="hlt">Al</span>{sub 8}Fe{sub 2−x}Ni{sub x}La. In both cases Ni and Fe atoms are statistically arranged, and no ordering is found. <span class="hlt">Al</span>{sub 8}Fe{sub 2−x}Ni{sub x}La particles contain inclusions in the form of <span class="hlt">Al</span>{sub 3}Fe δ layers.</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://ntrs.nasa.gov/search.jsp?R=19860043339&hterms=etching+aluminum&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Detching%2Baluminum','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19860043339&hterms=etching+aluminum&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Detching%2Baluminum"><span id="translatedtitle">Anisotropic etching of <span class="hlt">Al</span> by a directed Cl2 flux</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Efremow, N. N.; Geis, M. W.; Mountain, R. W.; Lincoln, G. A.; Randall, J. N.</p> <p>1986-01-01</p> <p>A new <span class="hlt">Al</span> etching technique is described that uses an ion beam from a Kaufman ion source and a directed Cl2 flux. The ion beam is used primarily to remove the native oxide and to allow the Cl2 to spontaneously react with the <span class="hlt">Al</span> film forming volatile <span class="hlt">Al</span>2Cl6. By controlling both the flux equivalent pressure of Cl2 and the ion beam current, this etching technique makes possible the anisotropic etching of <span class="hlt">Al</span> with etch rates from 100 nm/min to nearly 10 microns/min with a high degree of selectivity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JaJAP..53hNG02G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JaJAP..53hNG02G"><span id="translatedtitle">Enhanced charge storage performance in <span class="hlt">Al</span>Ti4Ox/<span class="hlt">Al</span>2O3 multilayer charge trapping memory devices</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gong, Changjie; Ou, Xin; Xu, Bo; Lan, Xuexin; Lei, Yan; Lu, Jianxin; Chen, Yan; Yin, Jiang; Xia, Yidong; Liu, Zhiguo; Li, Aidong; Yan, Feng</p> <p>2014-08-01</p> <p>The charge-trapping memory devices with the structures p-Si/<span class="hlt">Al</span>2O3/<span class="hlt">Al</span>Ti4Ox/<span class="hlt">Al</span>2O3/Pt were fabricated by using atomic layer deposition and RF magnetron sputtering techniques, and a memory window of 6.61 V and a high charge-trapping density of 1.29 × 1013 cm-2 at gate voltage of ±11 V have been obtained. The remarkable charge-trapping effect in the high-k composite oxide layer was ascribed to the electron-occupied defect states formed by the inter-diffusion at the interface of TiO2/<span class="hlt">Al</span>2O3. An <span class="hlt">Al</span>2O3 layer intercalated in the charge-trapping layer <span class="hlt">Al</span>Ti4Ox enlarged the memory window to 14.59 V and also improved the data retention property by suppressing the vertical charge migration.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014IJMMM..21..720L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014IJMMM..21..720L"><span id="translatedtitle">Thermoelectric properties of <span class="hlt">Al</span> substituted misfit cobaltite Ca3(Co1- x <span class="hlt">Al</span> x )4O9 at low temperature</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Yi; Chen, Hong-mei; Hu, Jin-lian; Tang, Xu-bing; Li, Hai-jin; Wang, Wei</p> <p>2014-07-01</p> <p>Thermoelectric properties of <span class="hlt">Al</span> substituted compounds Ca3(Co1- x <span class="hlt">Al</span> x )4O9 ( x = 0, 0.03, 0.05), prepared by a sol-gel process, have been investigated in the temperature range 305-20 K. The results indicate that after <span class="hlt">Al</span> substitution for Co in Ca3(Co1- x <span class="hlt">Al</span> x )4O9, the direct current electrical resistivity and thermopower increase due to the reduction of carrier concentration. Experiments show that <span class="hlt">Al</span> substitution results in decreased lattice thermal conductivity. The figure of merit of temperature behavior suggests that Ca3(Co0.97<span class="hlt">Al</span>0.03)4O9 would be a promising candidate thermoelectric material for high-temperature thermoelectric application.</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/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://www.ncbi.nlm.nih.gov/pubmed/21613690','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/21613690"><span id="translatedtitle">Signature of <span class="hlt">Al</span>11Sm3 fragments in undercooled <span class="hlt">Al</span>90Sm10 liquid from ab initio molecular dynamics simulations.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Fang, X W; Wang, C Z; Yao, Y X; Ding, Z J; Ho, K M</p> <p>2011-06-15</p> <p>An ab initio molecular dynamics (MD) simulation is performed to investigate the structural evolution in <span class="hlt">Al</span>(90)Sm(10) liquid from 1500 to 900 K. Development of <span class="hlt">Al</span>(11)Sm(3) local order upon rapid cooling is suggested by the Honeycutt-Anderson (HA) index analysis and the appearance of a predominant Sm-Sm-Sm bond angle around 90° when the liquid approaches the melting point (∼920 K). Direct structural evidence of <span class="hlt">Al</span>(11)Sm(3) fragments at 900 K is obtained using an atomic cluster alignment method developed recently. Meanwhile, development of strong icosahedral short range order (ISRO) and a non-negligible amount of fcc-type clusters around <span class="hlt">Al</span> in the system are also observed. These results suggest that fcc <span class="hlt">Al</span> and <span class="hlt">Al</span>(11)Sm(3) crystalline phases would compete strongly with the formation of an amorphous phase that exhibits ISRO in the diffusionless solidification limit upon rapid quenching. PMID:21613690</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 γ-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 γ-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/2016MS%26E..124a2139S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016MS%26E..124a2139S"><span id="translatedtitle">Boron-modified Ni3<span class="hlt">Al</span> intermetallic compound formed by spark plasma sintering of mechanically activated Ni and <span class="hlt">Al</span> powders</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shevtsova, L. I.; Ogneva, T. S.; Mul, D. O.; Esikov, M. A.; Larichkin, A. Yu; Malikov, V. N.</p> <p>2016-04-01</p> <p>A Ni3<span class="hlt">Al</span> intermetallic compound was obtained by spark plasma sintering of mechanically activated Ni and <span class="hlt">Al</span> powders in atomic ratio 3:1 respectively. Samples with boron addition of 0.1 and 0.2% (wt.) and samples without boron were obtained. The maximum value of the relative density (~99 %) has been obtained for the material by sintering of mechanically activated mixture powders modified with 0.1% of boron. No differences have been found between the structure of boron-modified Ni3<span class="hlt">Al</span> and Ni3<span class="hlt">Al</span> without boron addition. The maximum level of bending strength (2200 MPa) has been achieved for Ni3<span class="hlt">Al</span> with 0.1% (wt.) of boron. This value is almost 3 times the bending strength of the sample of Ni3<span class="hlt">Al</span> sintered without boron addition.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012ApPhL.101z2104T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012ApPhL.101z2104T"><span id="translatedtitle">Role of <span class="hlt">Al</span> and Ti for ohmic contact formation 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>Tokuda, Hirokuni; Kojima, Toshikazu; Kuzuhara, Masaaki</p> <p>2012-12-01</p> <p>A mechanism for ohmic contact formation using Ti/<span class="hlt">Al</span> based metals on <span class="hlt">Al</span>GaN/GaN heterostructures has been investigated by measuring temperature dependence of sheet electron density (ns) and mobility (μ). It was found that both ns and μ at room temperature for Ti/<span class="hlt">Al</span> deposited sample were increased by annealing in vacuum, while not for <span class="hlt">Al</span>/Ti deposited one. The results, especially increase in μ, cannot be understood by the conventional ohmic formation model, including Ti-N (nitrogen) complex formation or N vacancy formation. As the most probable mechanism for the increase in ns and μ, we have proposed a model, in which tensile strain is induced by the reaction of Ti/<span class="hlt">Al</span> and <span class="hlt">Al</span>GaN after annealing.</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://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://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/2016NIMPB.371..258C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016NIMPB.371..258C"><span id="translatedtitle">IBA analysis and corrosion resistance of Ti<span class="hlt">AlPtN/TiAlN/TiAl</span> multilayer films deposited over a CoCrMo using magnetron sputtering</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Canto, C. E.; Andrade, E.; de Lucio, O.; Cruz, J.; Solís, C.; Rocha, M. F.; Alemón, B.; Flores, M.; Huegel, J. C.</p> <p>2016-03-01</p> <p>The corrosion resistance and the elemental profile of multilayer coatings of Ti<span class="hlt">AlPtN/TiAlN/TiAl</span> synthesized by Physical Vapor Deposition (PVD) reactive magnetron sputtering over a CoCrMo alloy substrate in 10 periods of 30 min each were analyzed and compared to those of the substrate alone and to that of a Ti<span class="hlt">Al</span>PtN single layer coating of the same thickness. The objective of the present work was to create multilayers with different amounts of Pt to enhance the corrosion resistance of a biomedical alloy of CoCrMo. Corrosion tests were performed using Simulated Body Fluid (SBF) using potentiodynamic polarization tests at typical body temperature. The elemental composition and thickness of the coatings were evaluated with the combination of two ion beam analysis (IBA) techniques: a Rutherford Backscattering Spectroscopy (RBS) with alpha beam and a Nuclear Reaction Analysis with a deuteron beam.</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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