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Sample records for kahn milvi moks

  1. Herman Kahn Remembered.

    ERIC Educational Resources Information Center

    Futurist, 1983

    1983-01-01

    Four of Herman Kahn's co-workers and friends remember him as a calm optimist who believed that there are solutions to every problem. Particular attention is given to clarifying his ideas about thermonuclear war. (IS)

  2. Corner Office: ProQuest's Marty Kahn

    ERIC Educational Resources Information Center

    Fialkoff, Francine; Oder, Norman

    2009-01-01

    In a scant three years at ProQuest, Marty Kahn, CEO, has moved a company coming out of a financial morass back onto solid ground. He came on board after the purchase of ProQuest Information and Learning by the (mostly) privately owned Cambridge Information Group in late 2006 and the merger of ProQuest and CSA to form ProQuest CSA. (It's now just…

  3. The Kodaikanal Experience: Chapter II. Kahn-Montessori Interview

    ERIC Educational Resources Information Center

    NAMTA Journal, 2013

    2013-01-01

    This article provides an interview transcript between David Kahn and Mario Montessori (1898-1982), son of Dr. Maria Montessori. Mario Montessori dedicated his life to the preservation, dissemination and application of Montessori's works. Herein Kahn asks Montessori about his time living in the hills of Kodaikanal, India. Montessori touches upon…

  4. Probing for suitable climatology to estimate the predictability of monsoon onset over Kerala (MOK), India

    NASA Astrophysics Data System (ADS)

    Pal, J.; Chaudhuri, S.; Mukherjee, S.; Chowdhury, A. Roy

    2016-07-01

    Inter-annual variability in the onset of monsoon over Kerala (MOK), India, is investigated using daily temperature; mean sea level pressure; winds at 850, 500 and 200 hPa pressure levels; outgoing longwave radiation (OLR); sea surface temperature (SST) and vertically integrated moisture content anomaly with 32 years (1981-2013) observation. The MOK is classified as early, delayed, or normal by considering the mean monsoon onset date over Kerala to be the 1st of June with a standard deviation of 8 days. The objective of the study is to identify the synoptic setup during MOK and comparison with climatology to estimate the predictability of the onset type (early, normal, or delayed) with 5, 10, and 15 days lead time. The study reveals that an enhanced convection observed over the Bay of Bengal during early MOK is found to shift over the Arabian Sea during delayed MOK. An intense high-pressure zone observed over the western south Indian Ocean during early MOK shifts to the east during delayed MOK. Higher tropospheric temperature (TT) over the western Equatorial Ocean during early MOK and lower TT over the Indian subcontinent intensify the land-ocean thermal contrast that leads to early MOK. The sea surface temperature (SST) over the Arabian Sea is observed to be warmer during delayed than early MOK. During early MOK, the source of 850 hPa southwesterly wind shifts to the west equatorial zone while a COL region has been found during delayed MOK at that level. The study further reveals that the wind speed anomaly at the 200-hPa pressure level coincides inversely with the anomaly of tropospheric temperature.

  5. 220. BUILDING 42 (ENLISTED BARRACKS), 194041. ALBERT KAHN INC., ARCHITECTS. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    220. BUILDING 42 (ENLISTED BARRACKS), 1940-41. ALBERT KAHN INC., ARCHITECTS. DETAIL OF ENTRANCE AND WINDOW TREATMENT; VIEW FROM THE SOUTHWEST. - Quonset Point Naval Air Station, Roger Williams Way, North Kingstown, Washington County, RI

  6. 203. BUILDING 12 (OFFICER'S CLUB), 194041, ALBERT KAHN, INC., ARCHITECTS. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    203. BUILDING 12 (OFFICER'S CLUB), 1940-41, ALBERT KAHN, INC., ARCHITECTS. VIEW OF REAR OF BUILDING FROM THE SOUTH, SHOWING POOL AREA, ROOF TERRACES, ETC. - Quonset Point Naval Air Station, Roger Williams Way, North Kingstown, Washington County, RI

  7. 180. BUILDING 4 (LANDPLANE HANGAR), 194041. ALBERT KAHN, INC., ARCHITECTS. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    180. BUILDING 4 (LANDPLANE HANGAR), 1940-41. ALBERT KAHN, INC., ARCHITECTS. VIEW FROM THE SOUTHWEST: DETAIL OF SIDE ELEVATION SHOWING TYPICAL CURTAIN WALL, WINDOW AND DOOR TREATMENT; PORTIONS OF FRAMING AND ROOF MONITOR VISIBLE. - Quonset Point Naval Air Station, Roger Williams Way, North Kingstown, Washington County, RI

  8. 218. BUILDINGS 4156 (ENLISTED BARRACKS), 194041. ALBERT KAHN, INC., ARCHITECTS. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    218. BUILDINGS 41-56 (ENLISTED BARRACKS), 1940-41. ALBERT KAHN, INC., ARCHITECTS. GENERAL VIEW FROM THE WEST (ACROSS INTERSECTION OF 5TH AVE. AND LEXINGTON ST.) SHOWING, FROM LEFT TO RIGHT, BUILDING 45, 43, 41, 44, AND 42. IN BACKGROUND IS STRUCTURE 68 (WATER TOWER). - Quonset Point Naval Air Station, Roger Williams Way, North Kingstown, Washington County, RI

  9. 187. BUILDING 7 (ADMINISTRATIVE BUILDING), 194041. ALBERT KAHN, INC., ARCHITECTS. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    187. BUILDING 7 (ADMINISTRATIVE BUILDING), 1940-41. ALBERT KAHN, INC., ARCHITECTS. GENERAL VIEW FROM THE SOUTHWEST SHOWING ENTRANCE/MAIN ELEVATION AND SOUTHWEST SIDE. IN BACKGROUND ON LEFT: A PORTION OF BUILDING 41. IN BACKGROUND ON RIGHT: STRUCTURE 68 (WATER TOWER). - Quonset Point Naval Air Station, Roger Williams Way, North Kingstown, Washington County, RI

  10. Myxococcus xanthus mokA Encodes a Histidine Kinase-Response Regulator Hybrid Sensor Required for Development and Osmotic Tolerance

    PubMed Central

    Kimura, Yoshio; Nakano, Hiromi; Terasaka, Hideaki; Takegawa, Kaoru

    2001-01-01

    A gene, mokA, encoding a protein with similarities to histidine kinase-response regulator hybrid sensor, was cloned from a Myxococcus xanthus genomic library. The predicted mokA gene product was found to contain three domains: an amino-terminal input domain, a central transmitter domain, and a carboxy-terminal receiver domain. mokA mutants placed under starvation conditions exhibited reduced sporulation. Mutation of mokA also caused marked growth retardation at high osmolarity. These results indicated that M. xanthus MokA is likely a transmembrane sensor that is required for development and osmotic tolerance. The putative function of MokA is similar to that of the hybrid histidine kinase, DokA, of the eukaryotic slime mold Dictyostelium discoideum. PMID:11157925

  11. Distinct expression patterns of ICK/MAK/MOK protein kinases in the intestine implicate functional diversity.

    PubMed

    Chen, Tufeng; Wu, Di; Moskaluk, Christopher A; Fu, Zheng

    2013-01-01

    ICK/MRK (intestinal cell kinase/MAK-related kinase), MAK (male germ cell-associated kinase), and MOK (MAPK/MAK/MRK-overlapping kinase) are closely related serine/threonine protein kinases in the protein kinome. The biological functions and regulatory mechanisms of the ICK/MAK/MOK family are still largely elusive. Despite significant similarities in their catalytic domains, they diverge markedly in the sequence and structural organization of their C-terminal non-catalytic domains, raising the question as to whether they have distinct, overlapping, or redundant biological functions. In order to gain insights into their biological activities and lay a fundamental groundwork for functional studies, we investigated the spatio-temporal distribution patterns and the expression dynamics of ICK/MAK/MOK protein kinases in the intestine. We found that ICK/MAK/MOK proteins display divergent expression patterns along the duodenum-to-colon axis and during postnatal murine development. Furthermore, they are differentially partitioned between intestinal epithelium and mesenchyme. A significant increase in the protein level of ICK, but not MAK, was induced in human primary colon cancer specimens. ICK protein level was up-regulated whereas MOK protein level was down-regulated in mouse intestinal adenomas as compared with their adjacent normal intestinal mucosa. These data suggest distinct roles for ICK/MAK/MOK protein kinases in the regulation of intestinal neoplasia. Taken together, our findings demonstrate that the expressions of ICK/MAK/MOK proteins in the intestinal tract can be differentially and dynamically regulated, implicating a significant functional diversity within this group of protein kinases.

  12. Evaluation of intelligence in youthful offenders: the Kahn Intelligence Tests.

    PubMed

    Ream, J H

    1978-06-01

    It was hypothesized that there is a correlation between IQs on the Kahn Intelligence Tests and the WAIS. It was predicted that the correlation between the KIT IQs and the WAIS Performance IQs would be significantly higher than those between the KIT IQs and WAIS Verbal and Full Scale IQs. The KIT and WAIS were administered to 30 Negro and 20 white offenders ages 16-0 to 20-11. Pearson rs of .656, .649, and .714 were significant. Contrary to prediction, the r between the KIT IQs and the WAIS Performance was the lowest. Mean IQs were significantly different.

  13. Different architectures of creativity: Louis and Nathaniel Kahn.

    PubMed

    Golinelli, Paola

    2014-04-01

    The author analyzes Nathaniel Kahn's documentary film My Architect: A Son's Journey, a tribute to the writer-director's father Louis, the famous architect, who died suddenly when Nathaniel was eleven years old. The film's poetic, evocative images form a testimony to the silent working through that Nathaniel did in searching for his lost father and to the complex intertwining of mourning and creativity. Creativity is seen as both the cause and the effect of working through, as it gives life to a new meaning and allows replacement of the lost object by an object found again. Bereavement, symbolization, and the birth of representation appear to be connected with one another, both when the most elementary representations are involved and when the more complex and artistic ones are. Where and when it is possible to recover a representation that can survive the absence of the lost object, there is a potentially creative psychic space that can be made fertile again.

  14. Different architectures of creativity: Louis and Nathaniel Kahn.

    PubMed

    Golinelli, Paola

    2014-04-01

    The author analyzes Nathaniel Kahn's documentary film My Architect: A Son's Journey, a tribute to the writer-director's father Louis, the famous architect, who died suddenly when Nathaniel was eleven years old. The film's poetic, evocative images form a testimony to the silent working through that Nathaniel did in searching for his lost father and to the complex intertwining of mourning and creativity. Creativity is seen as both the cause and the effect of working through, as it gives life to a new meaning and allows replacement of the lost object by an object found again. Bereavement, symbolization, and the birth of representation appear to be connected with one another, both when the most elementary representations are involved and when the more complex and artistic ones are. Where and when it is possible to recover a representation that can survive the absence of the lost object, there is a potentially creative psychic space that can be made fertile again. PMID:24777371

  15. Automatic Synthesis and Deployment of Intensional Kahn Process Networks

    NASA Astrophysics Data System (ADS)

    Peralta, Manuel; Mukhopadhyay, Supratik; Bharadwaj, Ramesh

    In this paper we introduce and study, theoretically, a clean slate "formal" foundational approach for developing and deploying high-assurance distributed embedded systems deployed in mission-critical applications. We propose a simple formal distributed asynchronous framework extending Kahn Process Networks with intensional specification. More precisely, we present a model-driven approach based on a platform-independent language and an intensional specification logic that allows us to synthesize distributed agents that can handle interactions with external resources asynchronously, ensure enforcement of information flow and security policies, and have the ability to deal with failures of resources. Our approach allows rapid development and automated deployment of formally verified embedded networked systems that provide guarantees that clients' requirements will be met and QoS guarantees will be respected. Moreover, it allows modeling (and programming) reliable distributed systems for multi-core hosts. Such a capability makes our framework suitable for next generation grid computing systems where multi-core individual hosts need to be utilized for improving scalability.Given an intensional logical specification of a distributed embedded system, that includes Quality of Service (QoS) requirements, a set of software resources and devices available in a network, and their formal interface specifications, a deductive system can automatically generate distributed extended Kahn processes and their deployment information in such a way that the application requirements - including QoS requirements - are guaranteed to be met. The generated processes use the inputs of the sensors/meters/probes and the management policies of the customer to generate real-time control decisions for managing the system. The processes are deployed automatically on a distributed network involving sensors/meters/probes tracking system parameters, actuators controlling devices, and diverse computing

  16. [Fritz Kahn's The Life of Man: Production and Transcription of a Bestseller].

    PubMed

    Eilers, Miriam

    2015-01-01

    This paper investigates the production and circulation of the illustrations in Fritz Kahn's five-volume series The Life of Man, one of the most popular medical publications in the German interwar period. In 1912 Kahn (1888-1968), together with a staff of illustrators, began producing what would later become his best-selling series. Illustrations of this series (in particular, the poster The human factory/Der Mensch als Industriepalast) were widespread throughout Germany during the Weimar Republic. With the rise of National Socialism, Kahn was forced to emigrate in 1933. While his books were forbidden by the Nazi regime, their illustrations continued to play an important role in popular scientific discourse: they reappeared in the Nazi health-education programme and were adapted for Kahn's publications in exile at the same time. This paper discusses how their production process and collective authorship made this complex and heterogeneous reception possible. PMID:26253361

  17. [Fritz Kahn's The Life of Man: Production and Transcription of a Bestseller].

    PubMed

    Eilers, Miriam

    2015-01-01

    This paper investigates the production and circulation of the illustrations in Fritz Kahn's five-volume series The Life of Man, one of the most popular medical publications in the German interwar period. In 1912 Kahn (1888-1968), together with a staff of illustrators, began producing what would later become his best-selling series. Illustrations of this series (in particular, the poster The human factory/Der Mensch als Industriepalast) were widespread throughout Germany during the Weimar Republic. With the rise of National Socialism, Kahn was forced to emigrate in 1933. While his books were forbidden by the Nazi regime, their illustrations continued to play an important role in popular scientific discourse: they reappeared in the Nazi health-education programme and were adapted for Kahn's publications in exile at the same time. This paper discusses how their production process and collective authorship made this complex and heterogeneous reception possible.

  18. Equal Protection of the Laws: Sex is Not a Suspect Classification; Kahn v. Shevin, 94 S. Ct. 1734 (1974)

    ERIC Educational Resources Information Center

    Thomas, Gregg Darrow

    1974-01-01

    In Kahn v. Shevin the Supreme Court upheld a Florida Supreme Court ruling that a state tax exemption for widows was not in violation of the Fourteenth Amendment. The author discusses this and earlier sex discrimination cases, holding that a strict scrutiny test in such cases would promote equality of the sexes. (JT)

  19. Fordism in the hospital: Albert Kahn and the design of Old Main, 1917-25.

    PubMed

    Ahuja, Nitin K

    2012-07-01

    The 1917-25 planning and construction at the University of Michigan of a new University Hospital, later dubbed Old Main, offers a noteworthy case study of the formal convergence of hospital and factory in early twentieth-century America. Designed by Albert Kahn, the architect responsible for Ford Motor Company's archetypal automobile plants, and located in Ann Arbor, Michigan, less than forty miles from Detroit's burgeoning factory landscape, Old Main was well positioned to reflect the values of industry in both appearance and operation. The building's outer surface represents a striking departure from the historicism that characterized several other hospitals of this period, while plans for the building's novel diagnostic unit demonstrate unique operational parallels to the assembly line model of production. Ultimately, Old Main's industrial design similarities cast it as a precociously modernist hospital, relating streamlined form to function more explicitly than many of its contemporary institutions.

  20. Aging well socially through engagement with life: adapting Rowe and Kahn's model of successful aging to Chinese cultural context.

    PubMed

    Ng, Sik Hung; Cheung, Chau-Kiu; Chong, Alice M L; Woo, Jean; Kwan, Alex Y H; Lai, Stephanie

    2011-01-01

    Although aging well socially (engagement with life) is as important as aging well personally (illness avoidance and functioning) (Rowe & Kahn, 1998), it has received less research attention. A caring (CE) and a productive (PE) form of engagement were derived from an analysis of Chinese cultural meanings of engagement, and combined with illness avoidance and functioning to form a 4-factor model. Confirmatory factor analysis based on 2970 Hong Kong Chinese (40 to 74 years) showed a good model fit that was replicated a year later with 2120 of the original sample. Further analysis led to a more parsimonious model where illness avoidance and functioning converged into a single second-order factor whereas CE and PE remained as distinct first-order factors. The results supported the differentiation of Rowe and Kahn's engagement with life component into caring and productive engagements.

  1. Test Review: Swerdlik, M. E., Swerdlik, P., Kahn, J. H., & Thomas, T. (2003). "Psychological Processing Checklist." North Tonawanda, NY: Multi-Health Systems

    ERIC Educational Resources Information Center

    Sullivan, Jeremy R.

    2007-01-01

    The Psychological Processing Checklist (PPC) is a teacher-completed rating scale published by Multi-Health Systems in North Tonawanda, New York. The checklist was published in 2003 along with a technical manual (Swerdlik, Swerdlik, & Kahn, 2003). The 35-item PPC purports to measure difficulties with psychological processing among children in…

  2. What we need to know about callous-unemotional traits: comment on Frick, Ray, Thornton, and Kahn (2014).

    PubMed

    Lahey, Benjamin B

    2014-01-01

    Frick, Ray, Thornton, and Kahn (2014) presented a comprehensive and well-articulated review of studies relevant to the validity and utility of using callous-unemotional traits to subtype the diagnosis of conduct disorder (CD). Like definitions of subtypes of CD in previous versions of the Diagnostic and Statistical Manual of Mental Disorders, the available evidence on the validity of the new subtypes of CD in the Diagnostic and Statistical Manual of Mental Disorders (5th ed.; DSM-5; American Psychiatric Association, 2013) based on callous-unemotional traits is thin. Nonetheless, the target article makes a compelling argument for further study of callous-unemotional and related traits to better understand the heterogeneity of CD. In particular, the possibilities that callous-unemotional traits may facilitate understanding of etiology and psychobiological mechanisms and may help predict the prognosis and treatment outcomes of children with CD deserve greater study. Future research must be stronger than previous research, however, in using more appropriate samples of children with CD along with more informative designs, and in conducting analyses to directly test the incremental validity of callous-unemotional traits as a subtyping variable beyond the severity or aggressiveness of CD. PMID:24364746

  3. Mathematics as Filter of Equity -- An "Old" Story and a New Telling. Response to Michael Kahn: A Class Act--Mathematics as Filter of Equity in South Africa's Schools

    ERIC Educational Resources Information Center

    Adler, Jill; Setati, Mamokgethi

    2005-01-01

    In his article, A class act -- Mathematics as filter of equity in South African schools, Michael Kahn analyses South African data from matriculation examinations and draws on and re-examines previous analyses he himself has done. This document highlights the important insights into participation and performance in mathematics in South Africa that…

  4. The Kodaikanal Experience: Chapter I. Kahn-Wikramaratne Interview

    ERIC Educational Resources Information Center

    NAMTA Journal, 2013

    2013-01-01

    The Kodaikanal years were from late 1942 to March, 1944, a period of internment for Maria Montessori against her will in India. Yet in these remote hills, a fanfare and training course emerged, and so did the inspiration for an in-depth unification principle for the elementary program which we now loosely call Cosmic Education. These two…

  5. Kahn v. Superior Court of the County of Santa Clara: The Right to Privacy and the Academic Freedom Privilege with Respect to Confidential Peer Review Materials.

    ERIC Educational Resources Information Center

    Cunningham, Maureen P.; And Others

    1988-01-01

    A case in which California's constitutional right to privacy is used to protect confidential peer review files is analyzed, and the case's significance and possible ramifications for discovery requests of peer review files are discussed. (MSE)

  6. Sir Sayyid Ahmed Kahn's History of the Bijnor Rebellion, Translated with Notes and Introduction. South Asia Series, Occasional Paper No. 17.

    ERIC Educational Resources Information Center

    Michigan State Univ., East Lansing. Asian Studies Center.

    The Bijnor Rebellion of 1857 was a revolt of the Muslim minority in the Bijnor district of India against the British East India Company and Hindu loyalists. Sir Sayyid Ahmad Khan was an Indian Muslim serving the British Company. His account of the events of 1857 is the only one produced by an Indian who both participated in and analyzed the…

  7. 75 FR 80300 - Five-Year Review of Oil Pipeline Pricing Index

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-12-22

    ... Kahn Methodology 5. The Kahn Methodology measures changes in operating and capital costs ] on a per... 2009 in this proceeding).\\9\\ The Kahn Methodology does not include direct measures of the capital costs related to rate of return on investment or income taxes; as a proxy for this data, the Kahn...

  8. Response to the comment by Henry Kahn and Dennis Santella on a summary of the development of a signature for detection of residual dust from the collapse of the World Trade Center buildings

    USGS Publications Warehouse

    Meeker, Gregory P.; Lowers, Heather; Lioy, Paul J.; Lippmann, Morton

    2010-01-01

    A response by Gregory P. Meeker and colleagues to a commentary on their article on the development of a signature for detection of residual dust from the collapse of the World Trade Center buildings is presented

  9. WOMEN IN SCIENCE. Response to Comment on "Expectations of brilliance underlie gender distributions across academic disciplines".

    PubMed

    Cimpian, Andrei; Leslie, Sarah-Jane

    2015-07-24

    Ginther and Kahn claim that academics' beliefs about the importance of brilliance do not predict gender gaps in Ph.D. attainment beyond mathematics and verbal test scores. However, Ginther and Kahn's analyses are problematic, exhibiting more than 100 times the recommended collinearity thresholds. Multiple analyses that avoid this problem suggest that academics' beliefs are in fact uniquely predictive of gender gaps across academia.

  10. On Blocks and Broccoli: How to Organize Your Classroom.

    ERIC Educational Resources Information Center

    Alexander, Nancy

    1996-01-01

    Compares the organization of supermarkets to classroom environments. Emphasizes the efficient use of space with the use of containers, keeping materials in place, and grouping objects together. Provides suggestions on the use of color and adding storage space. (MOK)

  11. Good Afternoon, Sunshine! Protecting Children from Ultraviolet Rays.

    ERIC Educational Resources Information Center

    Certo, Delaine

    1996-01-01

    Notes caregivers' responsibility to protect children from too much exposure to ultraviolet radiation and the potential for melanoma. Provides suggestions on how to prevent children from sunburn and skin cancer, including the proper way to apply sunscreen. (MOK)

  12. Welcome to Garbage Museum.

    ERIC Educational Resources Information Center

    Elliot, Ian

    1996-01-01

    Introduces the Children's Garbage Museum in southwestern Connecticut and provides pictures as well as descriptions of exhibits. Suggests two activities to heighten students' awareness of recycling and composting and recommends reading materials. (MOK)

  13. Do Child Care Centers Have to Pay Staff for Time Spent in Training?

    ERIC Educational Resources Information Center

    Pekow, Charles

    1996-01-01

    Notes the different labor acts and policies that create confusion over whether centers must pay staff for training time if such training is required by law. Also notes state variations on this matter. (MOK)

  14. Beyond the Weather Chart: Weathering New Experiences.

    ERIC Educational Resources Information Center

    Huffman, Amy Bruno

    1996-01-01

    Describes an early childhood educator's approach to teaching children about rain, rainbows, clouds, precipitation, the sun, air, and wind. Recommends ways to organize study topics and describes experiments that can help children better understand the different elements of weather. (MOK)

  15. Comments on compressible effects on Alfven normal modes in nonuniform plasmas

    NASA Technical Reports Server (NTRS)

    Mok, Y.; Einaudi, G.

    1990-01-01

    The paper discusses the regime of validity of the theory of dissipative Alfven normal modes presented by Mok and Einaudi (1985) and Einaudi and Mok (1985), which was based on the incompressible closure of the system of ideal MHD equations. Some simple extensions of the earlier results to the compressible case are described. In addition, certain misunderstandings of this work, which have appeared in other papers, are clarified.

  16. MISR UAE2 Aerosol Versioning

    Atmospheric Science Data Center

    2013-03-21

    ... the MISR aerosol microphysical properties are "Beta." Uncertainty envelopes for the aerosol optical depths are given in  Kahn et ... particle microphysical property validation is in progress, uncertainty envelopes on particle size distribution, shape, and ...

  17. Genetic testing and disability insurance: an alternative opinion.

    PubMed

    Dodge, John H; Christianson, David J

    2007-01-01

    As members of the Working Group on Genetic Testing in Disability Insurance, the authors of this alternative opinion describe their areas of disagreement with some of the conclusions in the paper written by Susan M. Wolf and Jeffrey P. Kahn.

  18. Future Studies and Environmental Education.

    ERIC Educational Resources Information Center

    Howard, Jeanne

    1981-01-01

    Compares and discusses implications of future scenarios proposed by Herman Kahn and the Hudson River Institute and by the Club of Rome. Includes a decision-tree exercise appropriate for the classroom which involves five different future scenarios. (DC)

  19. Explorations in the Emergent Present

    ERIC Educational Resources Information Center

    Hanvey, Robert

    1975-01-01

    For perspectives, expresses by noted specialist, Meadows, Mesarovic, Heilbroner, and Kahn, on the challenges of world problems are augmented by five lessons for secondary students that promote a systematic approach to these problems. (JH)

  20. User Working Group Members

    Atmospheric Science Data Center

    2014-04-29

    ... Charles Ichoku Member NASA Goddard Space Flight Center (GSFC) charles.ichoku@nasa.gov Brian Kahn ... Hal Maring SMD Representative NASA Headquarters Program Scientist hal.maring@nasa.gov   ASDC ...

  1. WOMEN IN SCIENCE. Response to Comment on "Expectations of brilliance underlie gender distributions across academic disciplines".

    PubMed

    Cimpian, Andrei; Leslie, Sarah-Jane

    2015-07-24

    Ginther and Kahn claim that academics' beliefs about the importance of brilliance do not predict gender gaps in Ph.D. attainment beyond mathematics and verbal test scores. However, Ginther and Kahn's analyses are problematic, exhibiting more than 100 times the recommended collinearity thresholds. Multiple analyses that avoid this problem suggest that academics' beliefs are in fact uniquely predictive of gender gaps across academia. PMID:26206927

  2. A Note on "The Longitudinal Structure of Earnings Losses among Work-Limited Disabled Workers"

    ERIC Educational Resources Information Center

    Mok, Wallace K. C.; Meyer, Bruce D.; Charles, Kerwin Kofi; Achen, Alexandra C.

    2008-01-01

    Charles (2003) examines the dynamic effects of disability, finding a small decline in earnings and hours following disability onset, even for those who have positive disability reports for each of the next ten years. These outcomes also rebound quickly after the onset of disability. In recent work, Meyer and Mok (2006), find a much larger loss in…

  3. Hundreds of Ladybugs, Thousands of Ladybugs, Millions and Billions and Trillions of Ladybugs--and a Couple of Roaches.

    ERIC Educational Resources Information Center

    Tomich, Kelly

    1996-01-01

    Claims that children have a natural curiosity for their environment. Describes children's interaction and involvement in an activity with different kinds of insects in a Head Start classroom. Encourages parents to allow children to investigate without being too preoccupied with concerns for order or cleanliness. (MOK)

  4. Is the Court-Appointed Special Advocate Program Effective? A Longitudinal Analysis of Time Involvement and Case Outcomes.

    ERIC Educational Resources Information Center

    Leung, Patrick

    1996-01-01

    Describes the Court Appointed Special Advocate (CASA) Program for child welfare proceedings. Examines the current literature regarding the impact of CASA across the nation and discusses the findings and implications of an empirical study that evaluated a CASA program in terms of placement outcomes in a major U.S. city. (MOK)

  5. Puzzles: A Pathetically Neglected, Commonly Available Resource.

    ERIC Educational Resources Information Center

    Maldonado, Nancy S.

    1996-01-01

    States that puzzles are an important tool in helping children engage in the problem-solving process. Claims that children are interested in puzzles because they can be active as observers, problem solvers, and learners, with little or no assistance from adults and others. Defines nine characteristics of good puzzle-making situations. (MOK)

  6. "Of Mind, Body, and Spirit": Therapeutic Foster Care - An Innovative Approach to Healing from an NTU Perspective.

    ERIC Educational Resources Information Center

    Gregory, Shawan D. P.; Phillips, Frederick B.

    1997-01-01

    Examines Progressive Life Center's (PLC) Therapeutic Foster Care program and its incorporation of NTU psychotherapy into its program model. Describes how PLC strives to improve the delivery of mental health services through culturally competent therapeutic techniques for African Americans, including seriously emotionally disturbed children. (MOK)

  7. Teaching Reading and Writing.

    ERIC Educational Resources Information Center

    Manning, Maryann; Manning, Gary

    1996-01-01

    Introduces Earth Day. Encourages the use of reading, writing, and theme immersion to increase student participation in such activities. Provides information on several organizations which students can obtain concerning environmental awareness. Recommends reading materials that can be obtained in hard copy as well as on the Internet. (MOK)

  8. Quality Assurance in Private Higher Education in China

    ERIC Educational Resources Information Center

    Ozturgut, Osman

    2011-01-01

    The economic modernization drive of the 21st century has not only fostered the growth of a market economy but has also created the need for a structural change in education (Zha, 2006). Mok (2009) explains that when the Chinese government realized that the state alone could not keep up with the increasing demand for higher education, it allowed…

  9. Restructuring targets global electrical grid

    SciTech Connect

    Kahn, E.

    1997-12-31

    In the United Kingdom, restructuring has failed to produce substantial savings for the private customer. {open_quotes}The reality is that most of the benefits produced by the new competitive system have accrued to producers, not consumers,{close_quotes} says Edward Kahn, vice-president for National Economic Research Associates Inc., in San Francisco. But structural and historical differences are too great to allow the United States to adopt another country`s strategies. For instance, Kahn notes, {open_quotes}Outside the United States, utilities typically are publicly owned; inside the United States, utilities historically have been privately owned and heavily regulated{close_quotes}. In Australia, which most nearly compares with the United States in terms of geography and distribution of power lines, competitive practices have allowed utilities to cut employment rolls. {open_quotes}That`s one of the most effective ways to cut costs in a competitive environment,{close_quotes} Kahn says.

  10. The Impact of Cross-Cultural Experiences on Worldviews of Chinese International Students

    ERIC Educational Resources Information Center

    Yang, Haiwen; Harlow, Steven; Maddux, Cleborne; Smaby, Marlowe

    2006-01-01

    This study compared worldviews of Chinese international students who have been in the United States for 1 year or less, Chinese international students who have been in the United States for 4 years or more, and European American students. Worldview was assessed with the Scale to Assess Worldview (F. A. Ibrahim & H. Kahn, 1987). Results indicated…

  11. Worldview and Counseling: Perceptions of Singaporean Students.

    ERIC Educational Resources Information Center

    Soong, Cecilia

    This paper examines the worldviews of Singapore students, comprised of Chinese, Malays, and Indians, and explores students' perceptions of and preference for counseling approaches. A modified version of Ibrahim and Kahn's Scale to Assess World Views (1994) was used to assess 970 Secondary Four students' worldviews with the independent variables…

  12. How the Montessori Upper Elementary and Adolescent Environment Naturally Integrates Science, Mathematics, Technology, and the Environment

    ERIC Educational Resources Information Center

    McNamara, John

    2016-01-01

    John McNamara shares his wisdom and humbly credits Camillo Grazzini, Jenny Höglund, and David Kahn for his growth in Montessori. Recognizing more than what he has learned from his mentors, he shares the lessons he has learned from his students themselves. Math, science, history, and language are so integrated in the curriculum that students…

  13. Campus Visits

    ERIC Educational Resources Information Center

    Lustig, Susan

    2009-01-01

    In this annual Architectural Portfolio issue, the author presents the main winners that impressed the jury as facilities that will excite and challenge students in dramatic ways. The Children's School, Stamford, Connecticut, the Caudill winner, is "reminiscent of the Crow Island School," according to this year's jury. The Kahn winner, Peninsula…

  14. Support for nurses: paying it forward.

    PubMed

    Kahn, Sarah

    2016-07-14

    Sarah Kahn, Deputy Editor, BJN, speaks to Joan Pons Laplana who was awarded third place at this year's BJN Awards for Nurse of the Year. Joan had not wanted to become a nurse, but by sheer luck (realised in retrospect) that is what he ended up doing. Today, he uses his motivation to raise funds and share nursing knowledge. PMID:27409788

  15. An Analysis of Dyadic Relationships between Administrators and Employees Working Virtually in Higher Education

    ERIC Educational Resources Information Center

    Anderson, Rhonda L.

    2012-01-01

    The use of virtual teams has become a common practice for organizations across all industries nationally and internationally (Carmel & Agarwal, 2001; Hertel, Geister, & Konradt, 2005; Martins, Gilson, & Maynard, 2004; McDonough, Kahn, & Barczak, 2001). Institutions of higher education are also embracing the use of virtual teams…

  16. Below the Salary Line: Employee Engagement of Non-Salaried Employees

    ERIC Educational Resources Information Center

    Shuck, Brad; Albornoz, Carlos

    2007-01-01

    This exploratory empirical phenomological study looks at employee engagement using Kahn (1990) and Maslow's (1970) motivational theories to understand the experience of non-salaried employees. This study finds four themes that seem to affect employee engagement: work environment, employee's supervisor, individual characteristics of the employee,…

  17. Clarifying Notions of the Future: An Imperative for Educators.

    ERIC Educational Resources Information Center

    Catron, Christine

    1982-01-01

    Underscores the imperative for educators to consider futurists' projections of a radically different future. Considers the forecasts and theories of Kahn and Wiener, Meadows, Kuhn, Toffler, and others and questions the implications of educating students for the world each foresees. Urges forethought, constructive planning, and values-based…

  18. Nonviolent Action as a Necessary Component in Educating for Democracy

    ERIC Educational Resources Information Center

    Peterson, Barbara A.

    2014-01-01

    Educating for democracy, seen within a liberal democratic framework, requires that students develop the requisite knowledge and skills to recognize injustice and work effectively to oppose it. Stitzlein's notion of dissent is examined in conjunction with Kahne and Westheimer's argument for teaching democratic capacities by actively…

  19. The Research Self-Efficacy of Counselor Education and Supervision Doctoral Students

    ERIC Educational Resources Information Center

    Jones, Amy L.

    2012-01-01

    Research self-efficacy refers to a person's confidence in their ability to perform research activities (Bailey, 1999; Bard et al., 2000; Deemer, 2010; Holden et al., 1999; Kahn, 2001; Mulliken et al., 2007; Phillips et al., 2004; Unrau & Beck, 2004, Unrau & Grinnel, 2005). Little has been written on this topic in relation to Counselor…

  20. The Parent School Communications Questionnaire: A Measure of School Boundary Permeability.

    ERIC Educational Resources Information Center

    Wiener, William K.; Blumberg, Arthur

    The Parent-School Communications Questionnaire (PSCQ) is based on Katz and Kahn's (1967) notion of a directly proportional relationship between the permeability of the boundaries and the openness of a social system. The instrument is constructed to measure parental perceptions of five factors that seem heuristically to compose the…

  1. Yale Center for British Art

    ERIC Educational Resources Information Center

    Scully, Vincent Jr.

    1977-01-01

    The final building by architect Louis I. Kahn was completed after his death. Panels of gray stainless steel and dark glass form a perfect box. Available from: Architectural Record, 1221 Avenue of the Americas, New York, New York 10020; $5.00 single copy. (Author/MLF)

  2. As You Get Older

    MedlinePlus

    ... DMD, Orthodontics Lisa Young, MS, CCC-SLP, Speech-Language Pathology Edited by Members of the 2002 Publications ... MD, Plastic & Reconstructive Surgery David Jones, PhD, Speech-Language Pathology Alice Kahn, PhD, Speech-Language Pathology Karlind ...

  3. Faculty Development.

    ERIC Educational Resources Information Center

    Gillan, Bob, Ed.; McFerrin, Karen, Ed.

    This document contains the following papers on faculty development and technology: "Involving Faculty in Faculty Development" (Kristine Blair and Dan Madigan); "Technology Use in Higher Education: A Faculty Development Model" (Jessica Kahn); "A Faculty of Education as a Community of Learners: Growing to Meet the Demands of Instruction and…

  4. Laboratory Powder Metallurgy Makes Tough Aluminum Sheet

    NASA Technical Reports Server (NTRS)

    Royster, D. M.; Thomas, J. R.; Singleton, O. R.

    1993-01-01

    Aluminum alloy sheet exhibits high tensile and Kahn tear strengths. Rapid solidification of aluminum alloys in powder form and subsequent consolidation and fabrication processes used to tailor parts made of these alloys to satisfy such specific aerospace design requirements as high strength and toughness.

  5. The Impact of Employee Engagement Factors and Job Satisfaction on Turnover Intent

    ERIC Educational Resources Information Center

    Berry, Mary Lynn; Morris, Michael L.

    2008-01-01

    The current literature review examined a proposed relationship between the antecedent-employee engagement factors--and the outcome variable turnover intent mediated by job satisfaction. Kahn's Personal Engagement Theory, Equity Theory, and Herzberg's Two-Factor Theory of Job Satisfaction were used as the theoretical underpinnings for the review.…

  6. Prediction of Sexual Assault Experiences in College Women Based on Rape Scripts: A Prospective Analysis

    ERIC Educational Resources Information Center

    Turchik, Jessica A.; Probst, Danielle R.; Irvin, Clinton R.; Chau, Minna; Gidycz, Christine A.

    2009-01-01

    Although script theory has been applied to sexual assault (e.g., H. Frith & C. Kitzinger, 2001; A. S. Kahn, V. A. Andreoli Mathie, & C. Torgler, 1994), women's scripts of rape have not been examined in relation to predicting sexual victimization experiences. The purpose of the current study was to examine how elements of women's sexual assault…

  7. The Holocaust and History.

    ERIC Educational Resources Information Center

    Singer, Alan, Ed.

    2003-01-01

    This theme based journal issue consists of articles and teaching ideas focusing on the Holocaust and history. This publication contains the following materials: (1) "Multiple Perspectives on the Holocaust?" (Alan Singer); (2) "Responses to 'Multiple Perspectives on the Holocaust'"; (3) "Escape to Cuba: Story of Laura Kahn, a Holocaust Survivor"…

  8. Conference Attendance Patterns of Outdoor Orientation Program Staff at Four-Year Colleges in the United States

    ERIC Educational Resources Information Center

    Bell, Brent J.

    2009-01-01

    One purpose of professional conference attendance is to enhance social support. Intentionally fostering this support is an important political aim that should be developed. Although many multifactor definitions of social support exist (Cobb, 1979; Cohen & Syme, 1985; Kahn, 1979; Shaefer et al., 1981; Weiss, 1974), all distinguish between an…

  9. The Distress Disclosure Index: A Research Review and Multitrait-Multimethod Examination

    ERIC Educational Resources Information Center

    Kahn, Jeffrey H.; Hucke, Brandy E.; Bradley, Allyson M.; Glinski, Austin J.; Malak, Brittany L.

    2012-01-01

    The Distress Disclosure Index (DDI; J. H. Kahn & R. M. Hessling, 2001) is a brief self-report measure of one's tendency to disclose personally distressing information. The purpose of this article was to summarize what is known about the DDI, present new validity evidence, and make recommendations for use of the DDI. This article reviews research…

  10. "If I Am Losing Them, I'm Going to Change. So That's What We Did!" Third Grade Teachers Contemplate the Literacy Needs of Diverse Students within a Teacher Study Group

    ERIC Educational Resources Information Center

    Nason, Megan A.

    2012-01-01

    According to Birchak, Connor, Crawford, Kahn, Kaser, Turner, & Short (1998), Fang, Fu, & Lamme (2004), Kennedy & Sheil (2010), and Wiliam (2008), teacher study groups can provide a supportive and collaborative professional development environment. The purpose of this study was to examine the professional development experiences of…

  11. Global Science and Social Systems: The Essentials of Montessori Education and Peace Frameworks

    ERIC Educational Resources Information Center

    Kahn, David

    2016-01-01

    Inspired by Baiba Krumins-Grazzini's interdependencies lecture at NAMTA's Portland conference, David Kahn shows the unifying structures of the program that are rooted in the natural and social sciences. Through a connective web, these sciences explore the integration of all knowledge and lead to a philosophical view of life on earth, including…

  12. Summary of the Spring 1978 Conference of the National Consortium on Testing; June 5, 1978.

    ERIC Educational Resources Information Center

    Haney, Walt

    Remarks made at several panel discussions are summarized in this narrative report. The discussion topics and speakers include: (1) public education and testing--Tom Tomlinson, Ann Kahn, Herb Mack, and Jean Nazzaro, with remarks by Patricia Albjerg Graham; (2) standards regarding testing--Walt Haney, Barbara Lerner, Ann Cook, Willo White, and Bob…

  13. Student Engagement: Developing a Conceptual Framework and Survey Instrument

    ERIC Educational Resources Information Center

    Burch, Gerald F.; Heller, Nathan A.; Burch, Jana J.; Freed, Rusty; Steed, Steve A.

    2015-01-01

    Student engagement is considered to be among the better predictors of learning, yet there is growing concern that there is no consensus on the conceptual foundation. The authors propose a conceptualization of student engagement grounded in A. W. Astin's (1984) Student Involvement Theory and W. A. Kahn's (1990) employee engagement research where…

  14. Among the Orange Groves of Academe

    ERIC Educational Resources Information Center

    Monaghan, Peter

    2008-01-01

    This article describes the Citrus Variety Collection with its curator, Tracy L. Kahn. The collection has two trees each of 1,010 citrus types. They stand in row after row on 22 acres at one edge of the University of California campus at Riverside and serve as a resource for research and a safeguard for diversity. Citrus is a key crop in…

  15. Disaster Response and Planning for Libraries, Third Edition

    ERIC Educational Resources Information Center

    Kahn, Miriam B.

    2012-01-01

    Fire, water, mold, construction problems, power-outages--mishaps like these can not only bring library services to a grinding halt, but can also destroy collections and even endanger employees. Preparing for the unexpected is the foundation of a library's best response. Expert Kahn comes to the rescue with this timely update of the best…

  16. A Charged Particle in a Magnetic Field: A Review of Two Formalisms of Coherent States and the Husimi Function

    ERIC Educational Resources Information Center

    Herrera, D.; Valencia, A. M.; Pennini, F.; Curilef, S.

    2008-01-01

    In this work, we review two formalisms of coherent states for the case of a particle in a magnetic field. We focus our revision on both pioneering (Feldman and Kahn 1970 "Phys. Rev." B 1 4584) and recent (Kowalski and Rembielinski 2005 "J. Phys. A: Math. Gen." 38 8247) formulations of coherent states for this problem. We introduce a general…

  17. [Procedure for determination of individual sensitivity to antitumor drugs].

    PubMed

    Abduvaliev, A A; Gil'dieva, M S; Tatarskiĭ, V P

    2006-05-01

    The present paper proposes to employ the cultured tumor cells of the breast and chick fibroblasts after long-term cultivation (for above 24 days) to determine their individual drug sensitivity and, as a criterion of cell damage, to use the percent of destruction of the cell layer formed in the wells 24 hours after drug insertion. It also presents the comparative results of tests of 2 cellular models that have been used to determine the in vitro sensitivity of the cells of breast cancer and chick fibroblasts to melfalan and its complex compound with copper acetylacetonate - MOK*M. At the same time, the cytotoxic activity of MOK*M and melfalan against tumor cells has been not shown to differ greatly (16.02+/-1.85 and 15.71+/-0.65% cell layer destruction, respectively), but the same activity of MOK*M against the model of intact cells (chick fibroblasts) was much less (15.23+/-1.97%) than that of melfalan (95.39+/-1.11%). The test system proposed by the authors is of certain informative value and it may be used for the determination of the individual sensitivity of tumor cells to antitumor drugs.

  18. Cryogenic mechanical properties of low density superplastically formable Al-Li alloys

    SciTech Connect

    Verzasconi, S.L.; Morris, J.W. Jr.

    1989-03-01

    The aerospace industry is considering the use of low density, superplastically formable (SPF) materials, such as Al-Li alloys in cryogenic tankage. SPF modifications of alloys 8090, 2090, and 2090 + In were tested for strength and Kahn tear toughness. The results were compared to those of similar tests of 2219-T87, an alloy currently used in cryogenic tankage, and 2090-T81, a recently studied Al-Li alloy with exceptional cryogenic properties. With decreasing temperature, all materials showed an increase in strength, while most materials showed an increase in elongation and decrease in Kahn toughness. The indium addition to 2090 increased alloy strength, but did not improve the strength-toughness combination. The fracture mode was predominantly intergranular along small, recrystallized grains, with some transgranular fracture, some ductile rupture, and some delamination on large, unrecrystallized grains. 17 refs., 3 figs., 3 tabs.

  19. Remote Sensing of Aerosols from Satellites: Why Has It Been Do Difficult to Quantify Aerosol-Cloud Interactions for Climate Assessment, and How Can We Make Progress?

    NASA Technical Reports Server (NTRS)

    Kahn, Ralph A.

    2015-01-01

    The organizers of the National Academy of Sciences Arthur M. Sackler Colloquia Series on Improving Our Fundamental Understanding of the Role of Aerosol-Cloud Interactions in the Climate System would like to post Ralph Kahn's presentation entitled Remote Sensing of Aerosols from Satellites: Why has it been so difficult to quantify aerosol-cloud interactions for climate assessment, and how can we make progress? to their public website.

  20. Error Propagation in a System Model

    NASA Technical Reports Server (NTRS)

    Schloegel, Kirk (Inventor); Bhatt, Devesh (Inventor); Oglesby, David V. (Inventor); Madl, Gabor (Inventor)

    2015-01-01

    Embodiments of the present subject matter can enable the analysis of signal value errors for system models. In an example, signal value errors can be propagated through the functional blocks of a system model to analyze possible effects as the signal value errors impact incident functional blocks. This propagation of the errors can be applicable to many models of computation including avionics models, synchronous data flow, and Kahn process networks.

  1. Towards a formal semantics for Ada 9X

    NASA Technical Reports Server (NTRS)

    Guaspari, David; Mchugh, John; Wolfgang, Polak; Saaltink, Mark

    1995-01-01

    The Ada 9X language precision team was formed during the revisions of Ada 83, with the goal of analyzing the proposed design, identifying problems, and suggesting improvements, through the use of mathematical models. This report defines a framework for formally describing Ada 9X, based on Kahn's 'natural semantics', and applies the framework to portions of the language. The proposals for exceptions and optimization freedoms are also analyzed, using a different technique.

  2. An Interview with Joe McMann: Lessons Learned from Fifty Years of Observing Hardware and Human Behavior

    NASA Technical Reports Server (NTRS)

    McMann, Joe

    2011-01-01

    Pica Kahn conducted "An Interview with Joe McMann: Lessons Learned in Human and Hardware Behavior" on August 16, 2011. With more than 40 years of experience in the aerospace industry, McMann has gained a wealth of knowledge. This presentation focused on lessons learned in human and hardware behavior. During his many years in the industry, McMann observed that the hardware development process was intertwined with human influences, which impacted the outcome of the product.

  3. 47 CFR 90.22 - Paging operations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...-15.0 118-14-31.3 Chicago, IL 41-52-28.1 87-38-22.2 Philadelphia, PA-NJ 39-56-58.4 75-09-19.6 Detroit...-23.2 Washington, DC-MD-VA 38-53-51.4 77-00-31.9 Cleveland, OH 41-29-51.2 81-41-49.5 St Louis, MO-IL..., OH-KY 39-06-7.2 84-30-34.8 Kansas City, MO-KS 39-04-56.0 94-35-20.8 Buffalo, NY 42-52-52.2...

  4. Star Messenger: Galileo at the Millennium

    NASA Astrophysics Data System (ADS)

    White, R. E.

    1999-05-01

    Smith College has recently established the Louise B. and Edmund J. Kahn Liberal Arts Institute to foster interdisciplinary scholarship among the faculty. In the 1999-2000 academic year, the Kahn Institute is sponsoring a project entitled "Star Messenger: Galileo at the Millennium." The project will explore the impact of the astronomical discoveries of Galileo and his contemporaries on the Renaissance world-view and also use Galileo's experience as a lens for examining scientific and cultural developments at the symbolic juncture represented by the year 2000. Seven faculty fellows and 10-12 student fellows will participate in a year-long colloquium pursuing these themes, aided by the participation of some five Visiting Fellows. The inaugural public event will be a symposium on the historical Galileo, with presentation by three noted scholars, each of whom will return to campus for a second meeting with the Kahn colloquium. Additional events will include an exhibit of prints, artifacts, and rare books related to Galileo and his time, an early music concert featuring music composed by Galileo's father, and a series of other events sponsored by diverse departments and programs, all related to the broad themes of the Galileo project. The culminating events will be the premiere of a new music theater work, which will encapsulate the insights of the colloquium about human reactions to novel insights about the world, and a symposium presenting the research results of faculty and student fellows. The symposium will feature a capstone lecture by an visionary scholar projecting the implication of historical and contemporary trends into the future.

  5. BiDil: from another vantage point.

    PubMed

    Puckrein, Gary

    2006-01-01

    In a recent Health Affairs Web Exclusive, Pamela Sankar and Jonathan Kahn argue against the Food and Drug Administration's approval of BiDil as a new drug for the treatment of heart failure in African Americans. Their paper questions the existence of disparities between African American and other heart-failure patients and the motivations of BiDil's developers and manufacturer. The disparities are confirmed and persistent, however, and BiDil's effectiveness is proven. If the authors' logic were to prevail, patients would be denied life-saving therapy. Continued investigation will likely narrow identification of patients who will benefit. PMID:16912053

  6. An Interview with Joe McMann: His Life Lessons

    NASA Technical Reports Server (NTRS)

    McMann, Joe

    2011-01-01

    Pica Kahn conducted "An Interview with Joe McMann: His Life Lessons" on May 23, 2011. With over 40 years of experience in the aerospace industry, McMann has gained a wealth of knowledge. Many have been interested in his biography, progression of work at NASA, impact on the U.S. spacesuit, and career accomplishments. This interview highlighted the influences and decision-making methods that impacted his technical and management contributions to the space program. McMann shared information about the accomplishments and technical advances that committed individuals can make.

  7. Resourceful earth: a response to global 2000

    SciTech Connect

    Simon, J.L.; Kahn, H.

    1984-01-01

    Dismayed by the negativism of the Carter Administration's report Global 2000 and suspicious of the political uses being made of it, Professor Simon of the University of Maryland and the late Herman Kahn, with support from the Heritage Foundation, put together these studies by experts to correct what they think are fundamental errors. They call their rather optimistic statements about the future of population, food, water, resources, climate and other things unconditional predictions in the absence of an unforeseeable catastrophe - their underlying assumption being that people will do the right things to adjust constructively to change.

  8. Comparative studies on serological tests for syphilis

    PubMed Central

    Nakamura, Keizo; Ishizaka, Kimishige

    1954-01-01

    A comparative study was undertaken by the authors to determine the most reliable of the serodiagnostic tests for syphilis in current use in Japan. The criteria for the selection of sera, the way in which the standard tests were chosen, and the statistical method used for evaluating the results are described, and some of the detailed results are given. Five tests—the VDRL test, the agglutination test, Ogata's test, the Kahn test (with cardiolipin antigen), and Browning's test modified by Taniguchi (with cardiolipin antigen)—were found to be comparable in reliability to the Kolmer (Lederle) and VDRL (Lederle) tests employed in the USA. PMID:14364183

  9. Saving all the bits

    NASA Technical Reports Server (NTRS)

    Denning, Peter J.

    1990-01-01

    The scientific tradition of saving all the data from experiments for independent validation and for further investigation is under profound challenge by modern satellite data collectors and by supercomputers. The volume of data is beyond the capacity to store, transmit, and comprehend the data. A promising line of study is discovery machines that study the data at the collection site and transmit statistical summaries of patterns observed. Examples of discovery machines are the Autoclass system and the genetic memory system of NASA-Ames, and the proposal for knowbots by Kahn and Cerf.

  10. Fever without apparent source on clinical examination, lower respiratory infections in children, other infectious diseases, and acute gastroenteritis and diarrhea of infancy and early childhood.

    PubMed

    McCarthy, P L; Klig, J E; Kahn, J S; Shapiro, E D; Baron, M A

    1997-02-01

    This section focuses on issues in infectious disease that are commonly encountered in pediatric office practice. Paul McCarthy discusses recent literature regarding the evaluation and management of acute fevers without apparent source on clinical examination in infants and children and the evaluation of children with prolonged fevers of unknown origin. Jean Klig reviews recent literature about lower respiratory tract infection in children. Jeffrey Kahn and Eugene Shapiro discuss literature concerning several infectious diseases commonly seen in office settings and concerning which recent developments are of interest. Michael Baron reviews recent literature about gastroenteritis and diarrhea of infancy and early childhood.

  11. Self-handicapping and obesity: is there a sympathetic audience out there?

    PubMed

    Schill, T; Beyler, J; Wehr, J; Swigert, L; Tatter, T

    1991-06-01

    After reading a case description of a 20-year-old woman, subjects attributed her personal shortcomings to her weight rather than to herself per se. In particular, people who scored higher on a measure of self-handicapping were even more likely to attribute shortcomings to a person's weight and excuse or overlook them. A person who attributes shortcomings to being overweight will very likely find a sympathetic audience. These results support the suggestion by Baumeister, Kahn, and Tice (1990) that obesity can be a self-handicapping strategy.

  12. E. Latunde Odeku: the first African-American neurosurgeon trained in the United States.

    PubMed

    McClelland, Shearwood; Harris, Kimbra S

    2007-04-01

    The advances of the Civil Rights movement in the mid-20th century and the success of the first African-American neurosurgeons trained at the Montreal Neurological Institute have led to a number of African-Americans receiving neurosurgery training within the United States. Unfortunately, the details regarding the first African-American neurosurgeon trained in the United States, E. Latunde Odeku, have largely remained in obscurity. Born on June 29, 1927 in Lagos, Nigeria, Dr. Odeku received his M.D. from the Howard University College of Medicine in 1954. He spent the next year at the University of Michigan under the tutelage of Edgar A. Kahn, chief of neurosurgery, and was impressive enough to be offered a residency position. From 1956 to 1960, he trained under Dr. Kahn at the University of Michigan. In 1961, he returned to Howard as a member of the neurosurgery faculty, during which time he became the second African-American to be certified by the American Board of Neurological Surgery. Although he received multiple job offers in the United States, he chose to return to Nigeria where he worked tirelessly, providing excellent neurosurgical care and discipleship until his death in 1974. The diligence and intelligence of E. Latunde Odeku, M.D., F.A.C.S., enabled him to become the first African-American neurosurgeon trained in the United States. A truly global pioneer, his selfless service in America and Nigeria opened the door for people from each country to enhance the field of neurosurgery.

  13. An Einstein survey of the 1 keV soft X-ray background in the Galactic plane

    NASA Technical Reports Server (NTRS)

    Stanford, John M.; Caillault, Jean-Pierre

    1994-01-01

    We have analyzed 56 Einstein Observatory Imaging Proportional Counter (IPC) observations within +/- 3 deg of the Galactic plane in order to determine the low-latitude soft X-ray background flux in the 0.56-1.73 keV band. Any detected X-ray point source which fell within our regions of study was removed from the image, enabling us to present maps of the background flux as a function of Galactic latitude along 18 meridians. These maps reveal considerable structure to the background in the Galactic plane on an angular scale of approximately 1 deg. Our results are compared with those of an earlier study of the 1 keV X-ray background along l = 25 deg by Kahn & Caillault. The double-peaked structure they found is not discernible in our results, possibly because of the presence of solar backscattered flux in their data. A model which takes into account contributions to the background by extragalactic and stellar sources, the distribution of both atomic and molecular absorbing material with the Galaxy, the energy dependence of the cross section for absorption of X-rays, and the energy dependence of the detector has been constructed and fitted to these new data to derive constraints on the scale height, temperature, and volume emissivity of the unaccounted-for X-ray-emitting material. The results of this model along l = 25 deg are roughly similar to those of the model of Kahn & Caillault along the same meridian.

  14. The proliferation of surface-to-surface missiles and weapons of mass destruction and the emerging role of tactical missile defenses in Israel, Syria and Iran

    SciTech Connect

    Clark, T.H.

    1993-01-01

    The proliferation of surface-to-surface missiles (SSMs) and weapons of mass destruction has become one of the more serious security threats to post-Cold War peace. This dissertation examines the history of proliferation within the Middle East by focusing primarily on three trend-setting countries: Israel, Syria and Iran. Building on the theoretical framework established by Lewis A. Dunn and Herman Kahn, this dissertation examines why and how Israel, Syria and Iran have procured SSMs and weapons of mass destruction. The author also includes an analysis of tactical missile defenses and their impact on proliferation trends. The final section investigates the numerous arms control treaties and supplier cartels designed to halt or slow the pace of unconventional weapons proliferation. In many instances, Iraq serves as the primary example of how well-intentioned nonproliferation efforts have fallen short. This dissertation reveals some of the major flaws in these regimes while proposing necessary improvements if nonproliferation efforts are to succeed. In conclusion, this dissertation returns to the expanded Dunn-Kahn nuclear proliferation model. By categorizing the various reasons as to why countries choose to procure unconventional weapons, a more successful nonproliferation policy can be constructed. However, this dissertation warns that without political solutions to long-term disputes in the region, western-imposed nonproliferation regimes will fail. Thus, nonproliferation policies must be accompanied or preceded by a vigorous diplomatic and political effort to solve seemingly intractable differences.

  15. Critical Perspectives on Successful Aging: Does It “Appeal More Than It Illuminates”?

    PubMed Central

    Katz, Stephen; Calasanti, Toni

    2015-01-01

    “Successful aging” is one of gerontology’s most successful ideas. Applied as a model, a concept, an approach, an experience, and an outcome, it has inspired researchers to create affiliated terms such as “healthy,” “positive,” “active,” “productive,” and “effective” aging. Although embraced as an optimistic approach to measuring life satisfaction and as a challenge to ageist traditions based on decline, successful aging as defined by John Rowe and Robert Kahn has also invited considerable critical responses. This article takes a critical gerontological perspective to explore such responses to the Rowe–Kahn successful aging paradigm by summarizing its empirical and methodological limitations, theoretical assumptions around ideas of individual choice and lifestyle, and inattention to intersecting issues of social inequality, health disparities, and age relations. The latter point is elaborated with an examination of income, gender, racial, ethnic, and age differences in the United States. Conclusions raise questions of social exclusion and the future of successful aging research. PMID:24747713

  16. How do leader-member exchange quality and differentiation affect performance in teams? An integrated multilevel dual process model.

    PubMed

    Li, Alex Ning; Liao, Hui

    2014-09-01

    Integrating leader-member exchange (LMX) research with role engagement theory (Kahn, 1990) and role system theory (Katz & Kahn, 1978), we propose a multilevel, dual process model to understand the mechanisms through which LMX quality at the individual level and LMX differentiation at the team level simultaneously affect individual and team performance. With regard to LMX differentiation, we introduce a new configural approach focusing on the pattern of LMX differentiation to complement the traditional approach focusing on the degree of LMX differentiation. Results based on multiphase, multisource data from 375 employees of 82 teams revealed that, at the individual level, LMX quality positively contributed to customer-rated employee performance through enhancing employee role engagement. At the team level, LMX differentiation exerted negative influence on teams' financial performance through disrupting team coordination. In particular, teams with the bimodal form of LMX configuration (i.e., teams that split into 2 LMX-based subgroups with comparable size) suffered most in team performance because they experienced greatest difficulty in coordinating members' activities. Furthermore, LMX differentiation strengthened the relationship between LMX quality and role engagement, and team coordination strengthened the relationship between role engagement and employee performance. Theoretical and practical implications of the findings are discussed. PMID:25000359

  17. Speech development patterns and phonological awareness in preschool children.

    PubMed

    Mann, Virginia A; Foy, Judith G

    2007-06-01

    To examine the association between speech production and early literacy skills, this study of 102 preschool children looked at phonological awareness in relation to whether children were delayed, typical, or advanced in their articulation of consonants. Using a developmental typology inspired by some of the literature on speech development (Kahn and Lewis, The Kahn-Lewis phonological analysis, 1986; Shriberg, Journal of Speech and Hearing Research 36(1):105-140, 1993a), we found that failure to master the early-8 consonants and a greater prevalence of certain types of production errors were associated with deficient phonological awareness. We also found that children who made no consonant errors had advanced phonological awareness relative to other children in the sample. In all cases, both productive speech patterns and speech errors were more closely linked with rhyme awareness than with phoneme awareness. The association between speech production and rhyme awareness may provide some new directions for the early preschool assessment of risk for reading problems. PMID:17849216

  18. Why are repeated words produced with reduced durations? Evidence from inner speech and homophone production

    PubMed Central

    Jacobs, Cassandra L.; Yiu, Loretta K.; Watson, Duane G.; Dell, Gary S.

    2015-01-01

    Acoustic reduction for repeated words could be the result of articulation and motor practice (Lam & Watson, 2014), facilitated production (Kahn & Arnold, 2015; Gahl et al., 2012), or audience design and shared common ground (Galati & Brennan, 2010). We sought to narrow down what kind of facilitation leads to repetition reduction. Repetition could, in principle, facilitate production on a conceptual, lexical, phonological, articulatory, or acoustic level (Kahn & Arnold, 2015). We compared the durations of the second utterance of a target word when the initial production was aloud or silent. The silent presentation either involved unmouthed or mouthed inner speech. Overt production, unmouthed and mouthed inner speech all led to reduction in target word onsets, but target word durations were only shortened when a word was initially said aloud. In an additional experiment, we found that prior naming of a homophone of the target word also led to duration reduction. The results suggest that repetition reduction occurs when there is a recently experienced auditory memory of the item. We propose that duration may be controlled in part by auditory feedback during production, the use of which can be primed by recent auditory experience. PMID:26089592

  19. Family caregiving or caregiving alone: who helps the helper?

    PubMed

    Sims-Gould, Joanie; Martin-Matthews, Anne

    2007-01-01

    This study advances the understanding of family caregiving by examining the relationship between adult children caregivers and their helpers. Specifically, it focuses on examining "who helps whom" and extends analyses beyond the dyadic focus of caregiving in later life. The focus on helping and caregiving addresses the variety of contributions and responsibilities involving not only the caregiver who was the target respondent in this research, but also others identified as helpers in the provision of care. The data for this study are derived from the Work and Eldercare Research group of CARNET: The Canadian Aging Research Network. Secondary analysis of CARNET data focuses on data collected from 250 individuals with significant caregiving responsibilities for at least one older person. Findings extend Kahn & Antonucci's convoys of social support model (1981) and Cantor's model of social care (1991) by disentangling some of the dimensions of helping and caregiving, such as the distinction between direct and assistive help.

  20. Developing and maintaining state-wide adolescent pregnancy prevention coalitions: a preliminary investigation.

    PubMed

    Nezlek, J B; Galano, J

    1993-09-01

    This paper presents the results of a study of state-wide adolescent pregnancy prevention coalitions. Key informants in five states throughout the southern United States were given semi-structured interviews regarding the adolescent pregnancy prevention coalitions in their states. From these interviews and other documents, conclusions were drawn regarding the nature and importance of the environments within which these coalitions operate, the universe of activities in which coalitions engage, and the stages of development of these coalitions. Katz and Kahn's model of social organizations served as the basis for understanding coalitions in terms of these three considerations. Future research should consider the utility of organizational models that can explain more fully the organization--committee hybrid structure that tends to characterize these coalitions.

  1. Better and Worse: A Dual-Process Model of the Relationship between Core Self-evaluation and Work-Family Conflict

    PubMed Central

    Yu, Kun

    2016-01-01

    Based on both resource allocation theory (Becker, 1965; Bergeron, 2007) and role theory (Katz and Kahn, 1978), the current study aims to uncover the relationship between core self-evaluation (CSE) and three dimensions of work interference with family (WIF). A dual-process model was proposed, in which both work stress and career resilience mediate the CSE-WIF relationship. The mediation model was tested with a sample of employees from various organizations (N = 561). The results first showed that CSE was negatively related to time-based and strain-based WIF and positively related to behavior-based WIF via the mediation of work stress. Moreover, CSE was positively associated with behavior-based and strain-based WIF via the mediation of career resilience, suggesting that CSE may also have its “dark-side.” PMID:27790177

  2. Radio wave emitted by an extensive air showers in 10KHz to 1MHz region

    NASA Technical Reports Server (NTRS)

    Nichimura, J.

    1985-01-01

    The importance of radio waves in a frequency range of less than 1MHz in an EAS shower is discussed. Estimates of radio intensities at 10KHz, 100KHz and 1MHz in EAS showers made on the basis of the Kahn-Lerche theory. Negative charge excess in a shower is the main source of low frequency radio emission, in spite of the importance of the contribution of transverse current in the geomagnetic field in a higher frequency range. An estimate is also made for radio intensity produced when the shower hits the ground. The contribution of this process seems to be important at a large distance, i.e., beyond 1km from the shower axis.

  3. Lipopolysaccharide transport to the cell surface: periplasmic transport and assembly into the outer membrane.

    PubMed

    May, Janine M; Sherman, David J; Simpson, Brent W; Ruiz, Natividad; Kahne, Daniel

    2015-10-01

    Gram-negative bacteria possess an outer membrane (OM) containing lipopolysaccharide (LPS). Proper assembly of the OM not only prevents certain antibiotics from entering the cell, but also allows others to be pumped out. To assemble this barrier, the seven-protein lipopolysaccharide transport (Lpt) system extracts LPS from the outer leaflet of the inner membrane (IM), transports it across the periplasm and inserts it selectively into the outer leaflet of the OM. As LPS is important, if not essential, in most Gram-negative bacteria, the LPS biosynthesis and biogenesis pathways are attractive targets in the development of new classes of antibiotics. The accompanying paper (Simpson BW, May JM, Sherman DJ, Kahne D, Ruiz N. 2015 Phil. Trans. R. Soc. B 370, 20150029. (doi:10.1098/rstb.2015.0029)) reviewed the biosynthesis of LPS and its extraction from the IM. This paper will trace its journey across the periplasm and insertion into the OM.

  4. Prediction of R-curves from small coupon tests

    NASA Technical Reports Server (NTRS)

    Yeh, J. R.; Bray, G. H.; Bucci, R. J.; Macheret, Y.

    1994-01-01

    R-curves were predicted for Alclad 2024-T3 and C188-T3 sheet using the results of small-coupon Kahn tear tests in combination with two-dimensional elastic-plastic finite element stress analyses. The predictions were compared to experimental R-curves from 6.3, 16 and 60-inch wide M(T) specimens and good agreement was obtained. The method is an inexpensive alternative to wide panel testing for characterizing the fracture toughness of damage-tolerant sheet alloys. The usefulness of this approach was demonstrated by performing residual strength calculations for a two-bay crack in a representative fuselage structure. C188-T3 was predicted to have a 24 percent higher load carrying capability than 2024-T3 in this application as a result of its superior fracture toughness.

  5. Quantifying Aerosol Types and Their Impact on Trace Gas Retrievals From Satellite Measurements

    NASA Astrophysics Data System (ADS)

    Natraj, V.; Boesch, H.; Yung, Y. L.

    2005-12-01

    One of the major sources of uncertainty in the retrieval of trace gas abundances from space-borne measurements is the type, amount and vertical distribution of aerosols in the atmosphere. Optical properties were derived for the broad classification of aerosol types investigated by Kahn et al. (2001), taking polarization into account. Examination of the scattering matrix elements resulted in a smaller set of independent aerosol types whose radiative effects were different. Weighting functions were then calculated for each of these types, assuming exponentially tailing aerosol concentration in the troposphere and a Junge distribution for the stratosphere. The different shapes of the weighting functions indicate different amount and distribution of the information content. Implications for trace gas retrievals from satellite-based measurements made by polarization-sensitive instruments (such as those on OMI, GOME, SCIAMACHY and OCO) will be discussed.

  6. Photocopy of photograph (from NBPPNSY) photographer unknown, c. 1950's view ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of photograph (from NBP-PNSY) photographer unknown, c. 1950's view northwest from 350-ton crane of drydock no. 2 (Haer no. Pa-387-B), 1950's. Pump house for the drydock is the round building below center of the photograph. The large building at the left center is building 546, the Turret Shop where naval gun turrets were assembled at the center rear is the foundry/propeller shop (Haer No. Pa-387-O) built in 1919. The foundry/propeller shop (building no. 20), designed by Warren-Moore and Company, resembles the Contemporaneous Architecture of Albert Kahn, who designed similar buildings for Henry Ford and the Chrysler Corporation in the 1920's and 1930's. - Naval Base Philadelphia-Philadelphia Naval Shipyard, League Island, Philadelphia, Philadelphia County, PA

  7. Lipopolysaccharide transport to the cell surface: periplasmic transport and assembly into the outer membrane

    PubMed Central

    May, Janine M.; Sherman, David J.; Simpson, Brent W.; Ruiz, Natividad; Kahne, Daniel

    2015-01-01

    Gram-negative bacteria possess an outer membrane (OM) containing lipopolysaccharide (LPS). Proper assembly of the OM not only prevents certain antibiotics from entering the cell, but also allows others to be pumped out. To assemble this barrier, the seven-protein lipopolysaccharide transport (Lpt) system extracts LPS from the outer leaflet of the inner membrane (IM), transports it across the periplasm and inserts it selectively into the outer leaflet of the OM. As LPS is important, if not essential, in most Gram-negative bacteria, the LPS biosynthesis and biogenesis pathways are attractive targets in the development of new classes of antibiotics. The accompanying paper (Simpson BW, May JM, Sherman DJ, Kahne D, Ruiz N. 2015 Phil. Trans. R. Soc. B 370, 20150029. (doi:10.1098/rstb.2015.0029)) reviewed the biosynthesis of LPS and its extraction from the IM. This paper will trace its journey across the periplasm and insertion into the OM. PMID:26370939

  8. UNICEF/W.H.O. glucose electrolyte solution not always appropriate.

    PubMed

    Tripp, J H; Harries, J T

    1980-10-11

    The authors defended Dr. Kahn's and Dr. Blum's suggestion, reported in the May 17, 1980 issue of Lancet, that the formula for making GES (glucose electrolyte solution), used for the management of gastroenteritis, should be determined by the age and condition of the patients in each locality. They disagreed with the proposal of Dr. Clements, reported in the July 5, 1980 issue of Lancet, that all patients could be treated with a single solution, the UNICEF/WHO CES, or with a dilution of this single solution. Recent studies confirmed that there was considerable epidemiological variation in the type and degree of electrolyte disturbances among infants with gastroenteritis. Factors such as age, nutritional status, climate, and the type of pathagens were linked to different type of electrolyte disturbances. These differences should be taken into account in formulating the appropriate GES.

  9. Successful Aging and Subjective Well-Being Among Oldest-Old Adults

    PubMed Central

    Cho, Jinmyoung; Martin, Peter; Poon, Leonard W.

    2015-01-01

    Purpose of the Study: This research integrates successful aging and developmental adaptation models to empirically define the direct and indirect effects of 2 distal (i.e., education and past life experiences) and 5 proximal influences (i.e., physical functioning, cognitive functioning, physical health impairment, social resources, and perceived economic status) on subjective well-being. The proximal influences involved predictors outlined in most extant models of successful aging (e.g., Rowe & Kahn, 1998 [Rowe, J. W., & Kahn, R. L. (1998). Successful aging. New York: Pantheon Books.]). Our model extends such models by including distal impact as well as interactions between distal and proximal impacts. Design and Methods: Data were obtained from 234 centenarians and 72 octogenarians in the Georgia Centenarian Study. Structural equation modeling was conducted with Mplus 6.1. Results: Results showed significant direct effects of physical health impairment and social resources on positive aspects of subjective well-being among oldest-old adults. We also found significant indirect effects of cognitive functioning and education on positive affect among oldest-old adults. Social resources mediated the relationship between cognitive functioning and positive affect; and cognitive functioning and social resources mediated the relationship between education and positive affect. In addition, physical health impairment mediated the relationship between cognitive functioning and positive affect; and cognitive functioning and physical health impairment mediated the relationship between education and positive affect. Implications: Integrating 2 different models (i.e., successful aging and developmental adaptation) provided a comprehensive view of adaptation from a developmental perspective. PMID:25112594

  10. Reflection Grating Array Associated with the Reflection Grating Spectrometer Developed by the Space Research Organization of the Netherlands for the X-ray Multi-Mirror Mission (XMM)

    NASA Technical Reports Server (NTRS)

    Kahn, Steven M.

    2001-01-01

    The University of California, Berkeley (UCB) served as the Principal Investigator institution for the United States participation in the development of the Reflection Grating Spectrometer (RGS) which included the design, development, fabrication, and testing of the Reflection Grating Assembly (RGA). UCB was assisted in this role by the Lawrence Livermore National Laboratory and Columbia University who provided the primary facilities, materials, services and personnel necessary to complete the development. UC Berkeley's Dr. Steven Kahn provided the technical and scientific oversight for the design. development and testing of the RGA units by monitoring the performance of the units at various stages in their development. Dr. Kahn was also the primary contact with the Space Research Organization of the Netherlands (SRON) and represented the RGA development at all SRON and European Space Agency (ESA) reviews of the RGA status. In accordance with the contract, the team designed and developed novel optical technology to meet the unique requirements of the RGS. The ESA XMM-Newton Mission carries two identical Reflection Grating Spectrometers (RGS) behind two of its three nested sets of Wolter I type mirrors. The instrument allows high-resolution measurements in the soft X-ray range (6 to 38 angstroms or 2.1 to 0.3 keV) with a maximum effective area of about 140 sq cm at 15 angstroms. Its design is optimized for the detection of the K-shell transitions of carbon, nitrogen, oxygen, neon, magnesium, and silicon. as well as the L shell transitions of iron. The RGA itself consists of two units. A structure for each unit was designed to hold up to 220 gratings. In its final configuration, one unit holds 182 gratings and the second hold 181 gratings.

  11. Genetic Heterogeneity of Borrelia burgdorferi Sensu Lato in the Southern United States Based on Restriction Fragment Length Polymorphism and Sequence Analysis

    PubMed Central

    Lin, T.; Oliver, J. H.; Gao, L.; Kollars, T. M.; Clark, K. L.

    2001-01-01

    Fifty-six strains of Borrelia burgdorferi sensu lato, isolated from ticks and vertebrate animals in Missouri, South Carolina, Georgia, Florida, and Texas, were identified and characterized by PCR-restriction fragment length polymorphism (RFLP) analysis of rrf (5S)-rrl (23S) intergenic spacer amplicons. A total of 241 to 258 bp of intergenic spacers between tandemly duplicated rrf (5S) and rrl (23S) was amplified by PCR. MseI and DraI restriction fragment polymorphisms were used to analyze these strains. PCR-RFLP analysis results indicated that the strains represented at least three genospecies and 10 different restriction patterns. Most of the strains isolated from the tick Ixodes dentatus in Missouri and Georgia belonged to the genospecies Borrelia andersonii. Excluding the I. dentatus strains, most southern strains, isolated from the ticks Ixodes scapularis and Ixodes affinis, the cotton rat (Sigmodon hispidus), and cotton mouse (Peromyscus gossypinus) in Georgia and Florida, belonged to Borrelia burgdorferi sensu stricto. Seven strains, isolated from Ixodes minor, the wood rat (Neotoma floridana), the cotton rat, and the cotton mouse in South Carolina and Florida, belonged to Borrelia bissettii. Two strains, MI-8 from Florida and TXW-1 from Texas, exhibited MseI and DraI restriction patterns different from those of previously reported genospecies. Eight Missouri tick strains (MOK-3a group) had MseI patterns similar to that of B. andersonii reference strain 21038 but had a DraI restriction site in the spacer. Strain SCGT-8a had DraI restriction patterns identical to that of strain 25015 (B. bissettii) but differed from strain 25015 in its MseI restriction pattern. Strain AI-1 had the same DraI pattern as other southern strains in the B. bissettii genospecies but had a distinct MseI profile. The taxonomic status of these atypical strains needs to be further evaluated. To clarify the taxonomic positions of these atypical Borrelia strains, the complete sequences of

  12. Short-term retrospective versus prospective memory processing as emergent properties of the mind and brain: human fMRI evidence.

    PubMed

    Mok, L W

    2012-12-13

    The functional-neuroanatomical substrates for short-term retrospective versus prospective memory processing were examined in a delay task, in which associative choices were made conditionally based on the presenting discriminative/cue stimulus. Delay-period prospection could be of the intended choice and/or the expected response outcome, whereas delay-period retrospection would be of the just-presented cue stimulus. Previous results have shown that the spontaneous process of unique outcome prospection did not implicate the lateral prefrontal cortex (PFC) but instead implicated the lateral posterior parietal cortex (LPPC) in a modality-independent fashion (Mok et al., 2009). Spontaneous retrospection was more dependent on the medial temporal lobe (MTL). Nevertheless, it was anticipated that the more explicit process of prospecting an intended choice would implicate the lateral PFC. To verify this, Mok et al.'s data were further analyzed, with new control data. Healthy, young adults performed delayed discriminative choices under procedures that biased them toward different degrees of delay-period prospection: higher-using cue-unique, differential outcomes (DO); versus lower-using a non-unique, common outcome (CO), or unpredictable, non-differential outcomes (NDO). Experimental participants performed the DO versus CO procedures concurrently, while undergoing event-related functional magnetic resonance imaging (fMRI). Separately, control participants provided data for: the NDO condition; related comparison tasks, which biased them toward different degrees of delay-period retrospection; and null-event trials. Expectedly, the more explicit process of prospecting an intended associative choice implicated the lateral PFC, as part of and together with other components of the multiple-demand network. Comparisons against null-event trials indicated that the sustained delay activity observed in MTL and LPPC, respectively, was part of default brain activity. These results

  13. Academic stress and positive affect: Asian value and self-worth contingency as moderators among Chinese international students.

    PubMed

    Liao, Kelly Yu-Hsin; Wei, Meifen

    2014-01-01

    The theoretical model proposed by Berry and colleagues (Berry, 1997; Berry, Kim, Minde, & Mok, 1987) highlights the importance of identifying moderators in the acculturation process. Accordingly, the current study examined the Asian cultural value of family recognition through achievement (FRTA) and contingency of self-worth on academic competence (CSW-AC) as moderators in the association between academic stress and positive affect among Chinese international students. A total of 370 Chinese international students completed online surveys. Results from a hierarchical regression indicated that while academic stress was negatively associated with positive affect, FRTA was positively associated with positive affect. In other words, those with high academic stress reported a lower level of positive affect. However, individuals who endorsed high levels of FRTA reported a higher level of positive affect. In addition, results also revealed a significant interaction between academic stress and CSW-AC on positive affect. Thus, the study's finding supported the moderator role of CSW-AC. Simple effect analyses were conducted to examine the significant interaction. The results showed that higher levels of CSW-AC strengthened the negative association between academic stress and positive affect but lower levels of CSW-AC did not. Future research directions and implications are discussed. PMID:24491130

  14. Antitumor cell-complex vaccines employing genetically modified tumor cells and fibroblasts.

    PubMed

    Miguel, Antonio; Herrero, María José; Sendra, Luis; Botella, Rafael; Diaz, Ana; Algás, Rosa; Aliño, Salvador F

    2014-02-19

    The present study evaluates the immune response mediated by vaccination with cell complexes composed of irradiated B16 tumor cells and mouse fibroblasts genetically modified to produce GM-CSF. The animals were vaccinated with free B16 cells or cell complexes. We employed two gene plasmid constructions: one high producer (pMok) and a low producer (p2F). Tumor transplant was performed by injection of B16 tumor cells. Plasma levels of total IgG and its subtypes were measured by ELISA. Tumor volumes were measured and survival curves were obtained. The study resulted in a cell complex vaccine able to stimulate the immune system to produce specific anti-tumor membrane proteins (TMP) IgG. In the groups vaccinated with cells transfected with the low producer plasmid, IgG production was higher when we used free B16 cell rather than cell complexes. Nonspecific autoimmune response caused by cell complex was not greater than that induced by the tumor cells alone. Groups vaccinated with B16 transfected with low producer plasmid reached a tumor growth delay of 92% (p ≤ 0.01). When vaccinated with cell complex, the best group was that transfected with high producer plasmid, reaching a tumor growth inhibition of 56% (p ≤ 0.05). Significant survival (40%) was only observed in the groups vaccinated with free transfected B16 cells.

  15. Antitumor Cell-Complex Vaccines Employing Genetically Modified Tumor Cells and Fibroblasts

    PubMed Central

    Miguel, Antonio; Herrero, María José; Sendra, Luis; Botella, Rafael; Diaz, Ana; Algás, Rosa; Aliño, Salvador F.

    2014-01-01

    The present study evaluates the immune response mediated by vaccination with cell complexes composed of irradiated B16 tumor cells and mouse fibroblasts genetically modified to produce GM-CSF. The animals were vaccinated with free B16 cells or cell complexes. We employed two gene plasmid constructions: one high producer (pMok) and a low producer (p2F). Tumor transplant was performed by injection of B16 tumor cells. Plasma levels of total IgG and its subtypes were measured by ELISA. Tumor volumes were measured and survival curves were obtained. The study resulted in a cell complex vaccine able to stimulate the immune system to produce specific anti-tumor membrane proteins (TMP) IgG. In the groups vaccinated with cells transfected with the low producer plasmid, IgG production was higher when we used free B16 cell rather than cell complexes. Nonspecific autoimmune response caused by cell complex was not greater than that induced by the tumor cells alone. Groups vaccinated with B16 transfected with low producer plasmid reached a tumor growth delay of 92% (p ≤ 0.01). When vaccinated with cell complex, the best group was that transfected with high producer plasmid, reaching a tumor growth inhibition of 56% (p ≤ 0.05). Significant survival (40%) was only observed in the groups vaccinated with free transfected B16 cells. PMID:24556729

  16. Theoretical and Computational Investigation of High-Brightness Beams

    SciTech Connect

    Chen, Chiping

    2013-11-30

    Theoretical and computational investigations of adiabatic thermal beams have been carried out in parameter regimes relevant to the development of advanced high-brightness, high-power accelerators for high-energy physics research and for various applications such as light sources. Most accelerator applications require high-brightness beams. This is true for high-energy accelerators such as linear colliders. It is also true for energy recovery linacs (ERLs) and free electron lasers (FELs) such as x-ray free electron lasers (XFELs). The breakthroughs and highlights in our research in the period from February 1, 2013 to November 30, 2013 were: a) Completion of a preliminary theoretical and computational study of adiabatic thermal Child-Langmuir flow (Mok, 2013); and b) Presentation of an invited paper entitled ?Adiabatic Thermal Beams in a Periodic Focusing Field? at Space Charge 2013 Workshop, CERN, April 16-19, 2013 (Chen, 2013). In this report, an introductory background for the research project is provided. Basic theory of adiabatic thermal Child-Langmuir flow is reviewed. Results of simulation studies of adiabatic thermal Child-Langmuir flows are discussed.

  17. Crystal structure of the heptamolybdate(VI) (paramolybdate) ion, [Mo7O24]6-, in the ammonium and potassium tetrahydrate salts

    USGS Publications Warehouse

    Evans, H.T.; Gatehouse, B.M.; Leverett, P.

    1975-01-01

    The crystal structures of the isomorphous salts MI6 [Mo7O24],4H2O (M = NH4 or K) have been refined by three-dimensional X-ray diffraction methods. Unit cell dimensions of these monoclinic compounds, space group P21/C with Z = 4, are, ammonium salt: a = 8.3934 ?? 0.0008, b = 36.1703 ?? 0.0045, c = 10.4715 ?? 0.0011 A??, ?? = 115.958?? ?? 0.008??; and potassium salt: a = 8.15 ?? 0.02, b = 35.68 ?? 0.1, c = 10.30 ?? 0.02 A??, ?? = 115.2?? ?? 02??. By use of multiple Weissenberg patterns, 8197 intensity data (Mo-K?? radiation) for the ammonium compound and 2178 (Cu-K?? radiation) for the potassium compound were estimated visually and used to test and refine Lindqvist's proposed structure in the space group P21/c. Lindqvist's structure was confirmed and the full matrix least-squares isotropic refinement led to R 0.076 (ammonium) 0.120 (potassium), with direct unambiguous location of the cations and water molecules in the potassium compound.

  18. Academic stress and positive affect: Asian value and self-worth contingency as moderators among Chinese international students.

    PubMed

    Liao, Kelly Yu-Hsin; Wei, Meifen

    2014-01-01

    The theoretical model proposed by Berry and colleagues (Berry, 1997; Berry, Kim, Minde, & Mok, 1987) highlights the importance of identifying moderators in the acculturation process. Accordingly, the current study examined the Asian cultural value of family recognition through achievement (FRTA) and contingency of self-worth on academic competence (CSW-AC) as moderators in the association between academic stress and positive affect among Chinese international students. A total of 370 Chinese international students completed online surveys. Results from a hierarchical regression indicated that while academic stress was negatively associated with positive affect, FRTA was positively associated with positive affect. In other words, those with high academic stress reported a lower level of positive affect. However, individuals who endorsed high levels of FRTA reported a higher level of positive affect. In addition, results also revealed a significant interaction between academic stress and CSW-AC on positive affect. Thus, the study's finding supported the moderator role of CSW-AC. Simple effect analyses were conducted to examine the significant interaction. The results showed that higher levels of CSW-AC strengthened the negative association between academic stress and positive affect but lower levels of CSW-AC did not. Future research directions and implications are discussed.

  19. Fast dose kernel interpolation using Fourier transform with application to permanent prostate brachytherapy dosimetry

    SciTech Connect

    Liu, Derek Sloboda, Ron S.

    2014-05-15

    Purpose: Boyer and Mok proposed a fast calculation method employing the Fourier transform (FT), for which calculation time is independent of the number of seeds but seed placement is restricted to calculation grid points. Here an interpolation method is described enabling unrestricted seed placement while preserving the computational efficiency of the original method. Methods: The Iodine-125 seed dose kernel was sampled and selected values were modified to optimize interpolation accuracy for clinically relevant doses. For each seed, the kernel was shifted to the nearest grid point via convolution with a unit impulse, implemented in the Fourier domain. The remaining fractional shift was performed using a piecewise third-order Lagrange filter. Results: Implementation of the interpolation method greatly improved FT-based dose calculation accuracy. The dose distribution was accurate to within 2% beyond 3 mm from each seed. Isodose contours were indistinguishable from explicit TG-43 calculation. Dose-volume metric errors were negligible. Computation time for the FT interpolation method was essentially the same as Boyer's method. Conclusions: A FT interpolation method for permanent prostate brachytherapy TG-43 dose calculation was developed which expands upon Boyer's original method and enables unrestricted seed placement. The proposed method substantially improves the clinically relevant dose accuracy with negligible additional computation cost, preserving the efficiency of the original method.

  20. Psychrobium conchae gen. nov., sp. nov., a psychrophilic marine bacterium isolated from the Iheya North hydrothermal field.

    PubMed

    Nogi, Yuichi; Abe, Mariko; Kawagucci, Shinsuke; Hirayama, Hisako

    2014-11-01

    A novel psychrophilic, marine, bacterial strain designated BJ-1(T) was isolated from the Iheya North hydrothermal field in the Okinawa Trough off Japan. Cells were Gram-negative, rod-shaped, non-spore-forming, aerobic chemo-organotrophs and motile by means of a single polar flagellum. Growth occurred at temperatures below 16 °C, with the optimum between 9 and 12 °C. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that the closest relatives of strain BJ-1(T) were Shewanella denitrificans OS-217(T) (93.5% similarity), Shewanella profunda DSM 15900(T) (92.9%), Shewanella gaetbuli TF-27(T) (92.9%), Paraferrimonas sedimenticola Mok-106(T) (92.1%) and Ferrimonas kyonanensis Asr22-7(T) (91.7%). The major respiratory quinone was Q-8. The predominant fatty acids were C(16:1)ω7c and C(16:0). The G+C content of the novel strain was 40.5 mol%. Based on phylogenetic, phenotypic and chemotaxonomic evidence, it is proposed that strain BJ-1(T) represents a novel species in a new genus, for which the name Psychrobium conchae gen. nov., sp. nov. is proposed. The type strain of Psychrobium conchae is BJ-1(T) ( =JCM 30103(T) =DSM 28701(T)).

  1. Lipopolysaccharide transport to the cell surface: biosynthesis and extraction from the inner membrane

    PubMed Central

    Simpson, Brent W.; May, Janine M.; Sherman, David J.; Kahne, Daniel; Ruiz, Natividad

    2015-01-01

    The cell surface of most Gram-negative bacteria is covered with lipopolysaccharide (LPS). The network of charges and sugars provided by the dense packing of LPS molecules in the outer leaflet of the outer membrane interferes with the entry of hydrophobic compounds into the cell, including many antibiotics. In addition, LPS can be recognized by the immune system and plays a crucial role in many interactions between bacteria and their animal hosts. LPS is synthesized in the inner membrane of Gram-negative bacteria, so it must be transported across their cell envelope to assemble at the cell surface. Over the past two decades, much of the research on LPS biogenesis has focused on the discovery and understanding of Lpt, a multi-protein complex that spans the cell envelope and functions to transport LPS from the inner membrane to the outer membrane. This paper focuses on the early steps of the transport of LPS by the Lpt machinery: the extraction of LPS from the inner membrane. The accompanying paper (May JM, Sherman DJ, Simpson BW, Ruiz N, Kahne D. 2015 Phil. Trans. R. Soc. B 370, 20150027. (doi:10.1098/rstb.2015.0027)) describes the subsequent steps as LPS travels through the periplasm and the outer membrane to its final destination at the cell surface. PMID:26370941

  2. A laboratory means to produce tough aluminum sheet from powder

    NASA Technical Reports Server (NTRS)

    Singleton, O. R.; Royster, D. M.; Thomas, J. R.

    1990-01-01

    The rapid solidification of aluminum alloys as powder and the subsequent fabrication processes can be used to develop and tailor alloys to satisfy specific aerospace design requirements, including high strength and toughness. Laboratory procedures to produce aluminum powder-metallurgy (PM) materials are efficient but require evidence that the laboratory methods used can produce a product with superior properties. This paper describes laboratory equipment and procedures which can be used to produce tough aluminum PM sheet. The processing of a 2124 + 0.9 percent Zr aluminum alloy powder is used as an example. The fully hardened sheet product is evaluated in terms of properties and microstructure. The key features of the vacuum hot press pressing operation used to consolidate the powder are described. The 2124 + 0.9 percent Zr - T8 temper aluminum sheet produced was both strong (460-490 MPa yield strength) and tough (Kahn Tear unit-propagation- energy values over three times those typical for ingot metallurgy 2024-T81). Both the longitudinal and longitudinal-transverse directions of the sheet were tested. The microstructure was well refined with subgrains of one or two micrometers. Fine dispersoids of Al3Zr in the precipitate free regions adjacent to boundaries are believed to contribute to the improved toughness.

  3. The emergence of a positive gerontology: from disengagement to social involvement.

    PubMed

    Johnson, Kimberly J; Mutchler, Jan E

    2014-02-01

    The latter part of the 20th century was a period characterized by a fundamental transition in scholarship on activity and the aging process. Theory emphasizing the inevitable decline of human capacity was gradually replaced with concepts stressing positive, multidimensional views of aging. In this article, we highlight the key contributors and trace the origins and overlapping themes of successful aging, productive aging, and civic engagement in later life: 3 examples of scholarship representing a "positive" gerontology. Rowe and Kahn's model of successful aging highlights the interplay between social engagement with life, health, and functioning for a positive aging experience. Productive aging, led by Robert Butler, recognizes the previously underappreciated participation of older adults in activities such as volunteering, paid work, and caregiving, and generates interest in the individual and societal barriers to and benefits of participation. Civic engagement in later life raises public awareness about the need to involve older adults in the community, creates opportunities for participation, and generates further interest in the mutual benefit of participation for community beneficiaries and participants. Successful aging, productive aging, and civic engagement represent important contributions to the field of gerontology through applications to policy, advocacy, and theory development.

  4. MISR Global Aerosol Product Assessment by Comparison with AERONET

    NASA Technical Reports Server (NTRS)

    Kahn, Ralph A.; Gaitley, Barbara J.; Garay, Michael J.; Diner, David J.; Eck, Thomas F.; Smirnov, Alexander; Holben, Brent N.

    2010-01-01

    A statistical approach is used to assess the quality of the MISR Version 22 (V22) aerosol products. Aerosol Optical Depth (AOD) retrieval results are improved relative to the early post- launch values reported by Kahn et al. [2005a], varying with particle type category. Overall, about 70% to 75% of MISR AOD retrievals fall within 0.05 or 20% AOD of the paired validation data, and about 50% to 55% are within 0.03 or 10% AOD, except at sites where dust, or mixed dust and smoke, are commonly found. Retrieved particle microphysical properties amount to categorical values, such as three groupings in size: "small," "medium," and "large." For particle size, ground-based AERONET sun photometer Angstrom Exponents are used to assess statistically the corresponding MISR values, which are interpreted in terms of retrieved size categories. Coincident Single-Scattering Albedo (SSA) and fraction AOD spherical data are too limited for statistical validation. V22 distinguishes two or three size bins, depending on aerosol type, and about two bins in SSA (absorbing vs. non-absorbing), as well as spherical vs. non-spherical particles, under good retrieval conditions. Particle type sensitivity varies considerably with conditions, and is diminished for mid-visible AOD below about 0.15 or 0.2. Based on these results, specific algorithm upgrades are proposed, and are being investigated by the MISR team for possible implementation in future versions of the product.

  5. A laboratory means to produce tough aluminum sheet from powder

    NASA Astrophysics Data System (ADS)

    Singleton, O. R.; Royster, D. M.; Thomas, J. R.

    The rapid solidification of aluminum alloys as powder and the subsequent fabrication processes can be used to develop and tailor alloys to satisfy specific aerospace design requirements, including high strength and toughness. Laboratory procedures to produce aluminum powder-metallurgy (PM) materials are efficient but require evidence that the laboratory methods used can produce a product with superior properties. This paper describes laboratory equipment and procedures which can be used to produce tough aluminum PM sheet. The processing of a 2124 + 0.9 percent Zr aluminum alloy powder is used as an example. The fully hardened sheet product is evaluated in terms of properties and microstructure. The key features of the vacuum hot press pressing operation used to consolidate the powder are described. The 2124 + 0.9 percent Zr - T8 temper aluminum sheet produced was both strong (460-490 MPa yield strength) and tough (Kahn Tear unit-propagation- energy values over three times those typical for ingot metallurgy 2024-T81). Both the longitudinal and longitudinal-transverse directions of the sheet were tested. The microstructure was well refined with subgrains of one or two micrometers. Fine dispersoids of Al3Zr in the precipitate free regions adjacent to boundaries are believed to contribute to the improved toughness.

  6. The Contribution of Water Ice Clouds to the Water Cycle in the North Polar Region of Mars: Preliminary Analysis

    NASA Technical Reports Server (NTRS)

    Bass, D. S.; Tamppari, L. K.

    2000-01-01

    While it has long been known that Mars' north residual polar cap and the Martian regolith are significant sources of atmospheric water vapor, the amount of water vapor observed in the northern spring season by the Viking Mars Atmospheric Water Detector instrument (MAWD) cannot be attributed to cap and regolith sources alone. Kahn suggested that ice hazes may be the mechanism by which additional water is supplied to the Martian atmosphere. Additionally, a significant decrease in atmospheric water vapor was observed in the late northern summer that could not be correlated with the return of the cold seasonal C02 ice. While the detection of water ice clouds on Mars indicate that water exists in Mars' atmosphere in several different phases, the extent to which water ice clouds play a role in moving water through the Martian atmosphere remains uncertain. Work by Bass et. al. suggested that the time dependence of water ice cap seasonal variability and the increase in atmospheric water vapor depended on the polar cap center reaching 200K, the night time saturation temperature. Additionally, they demonstrated that a decrease in atmospheric water vapor may be attributed to deposition of water ice onto the surface of the polar cap; temperatures were still too warm at this time in the summer for the deposition of carbon dioxide. However, whether water ice clouds contribute significantly to this variability is unknown. Additional information is contained in original extended abstract.

  7. Commemorating John Dyson

    NASA Astrophysics Data System (ADS)

    Pittard, Julian M.

    2015-03-01

    John Dyson was born on the 7th January 1941 in Meltham Mills, West Yorkshire, England, and later grew up in Harrogate and Leeds. The proudest moment of John's early life was meeting Freddie Trueman, who became one of the greatest fast bowlers of English cricket. John used a state scholarship to study at Kings College London, after hearing a radio lecture by D. M. McKay. He received a first class BSc Special Honours Degree in Physics in 1962, and began a Ph.D. at the University of Manchester Department of Astronomy after being attracted to astronomy by an article of Zdenek Kopal in the semi-popular journal New Scientist. John soon started work with Franz Kahn, and studied the possibility that the broad emission lines seen from the Orion Nebula were due to flows driven by the photoevaporation of neutral globules embedded in a HII region. John's thesis was entitled ``The Age and Dynamics of the Orion Nebula`` and he passed his oral examination on 28th February 1966.

  8. Display symmetry affects positional specificity in same-different judgment of pairs of novel visual patterns.

    PubMed

    Dill, M; Fahle, M

    1999-11-01

    Deciding whether a novel visual pattern is the same as or different from a previously seen reference is easier if both stimuli are presented to the same rather than to different locations in the field of view (Foster & Kahn (1985). Biological Cybernetics, 51, 305-312; Dill & Fahle (1998). Perception and Psychophysics, 60, 65-81). We investigated whether pattern symmetry interacts with the effect of translation. Patterns were small dot-clouds which could be mirror-symmetric or asymmetric. Translations were displacements of the visual pattern symmetrically across the fovea, either left-right or above-below. We found that same-different discriminations were worse (less accurate and slower) for translated patterns, to an extent which in general was not influenced by pattern symmetry, or pattern orientation, or direction of displacement. However, if the displaced pattern was a mirror image of the original one (along the trajectory of the displacement), then performance was largely invariant to translation. Both positional specificity and its reduction in symmetric displays may be explained by location-specific pre-processing of the visual input.

  9. Convoys of care: Theorizing intersections of formal and informal care

    PubMed Central

    Kemp, Candace L.; Ball, Mary M.; Perkins, Molly M.

    2013-01-01

    Although most care to frail elders is provided informally, much of this care is paired with formal care services. Yet, common approaches to conceptualizing the formal–informal intersection often are static, do not consider self-care, and typically do not account for multi-level influences. In response, we introduce the “convoy of care” model as an alternative way to conceptualize the intersection and to theorize connections between care convoy properties and caregiver and recipient outcomes. The model draws on Kahn and Antonucci's (1980) convoy model of social relations, expanding it to include both formal and informal care providers and also incorporates theoretical and conceptual threads from life course, feminist gerontology, social ecology, and symbolic interactionist perspectives. This article synthesizes theoretical and empirical knowledge and demonstrates the convoy of care model in an increasingly popular long-term care setting, assisted living. We conceptualize care convoys as dynamic, evolving, person- and family-specific, and influenced by a host of multi-level factors. Care convoys have implications for older adults’ quality of care and ability to age in place, for job satisfaction and retention among formal caregivers, and for informal caregiver burden. The model moves beyond existing conceptual work to provide a comprehensive, multi-level, multi-factor framework that can be used to inform future research, including research in other care settings, and to spark further theoretical development. PMID:23273553

  10. Sustainable development in British land use regulation

    SciTech Connect

    Basiago, A.D.

    1995-12-01

    Sustainable development is a new international theory of development founded on principles of futurity, environment, equity and participation. It is the legacy of twenty years of international environmental law that has established a doctrine of global trusteeship. Sustainable development has entered British land use regulation through the Maastricth Treaty; the EU`s Fifth Environmental Action Program; as well as the British government`s Planning Policy Guidance notes on land use principles, local plans, transport and historic preservation, and its white papers. The Earth Summit accord Agenda 21 is a blueprint on how to make development socially, economically and environmentally sustainable. Under its terms, Britain has prepared a national sustainable development strategy for the UN`s Commission on Sustainable Development. It features Local Agenda 21 strategies in which local authorities develop policies for sustainable development and establish partnerships with other sectors. In this paper, the Local Agenda 21 strategies of seven local authorities are evaluated according to the paradigm introduced in Agenda 21 and elaborated by Kahn that describes sustainable development as a dynamic system of integrated and interlinked economic, social and environmental sustainability. The author concludes that sustainable development in British land use regulation is guided by notions of economic development, social justice and environmental planning and not by the dynamic, integrated model of Agenda 21. 46 refs., 3 figs.

  11. Using Research-Based Interactive Video Vignettes to Enhance Out-of-Class Learning in Introductory Physics

    NASA Astrophysics Data System (ADS)

    Laws, Priscilla W.; Willis, Maxine C.; Jackson, David P.; Koenig, Kathleen; Teese, Robert

    2015-02-01

    Ever since the first generalized computer-assisted instruction system (PLATO1) was introduced over 50 years ago, educators have been adding computer-based materials to their classes. Today many textbooks have complete online versions that include video lectures and other supplements. In the past 25 years the web has fueled an explosion of online homework and course management systems, both as blended learning and online courses. Meanwhile, introductory physics instructors have been implementing new approaches to teaching based on the outcomes of Physics Education Research (PER). A common theme of PER-based instruction has been the use of active-learning strategies designed to help students overcome alternative conceptions that they often bring to the study of physics.2 Unfortunately, while classrooms have become more active, online learning typically relies on passive lecture videos or Kahn-style3 tablet drawings. To bring active learning online, the LivePhoto Physics Group has been developing Interactive Video Vignettes (IVVs) that add interactivity and PER-based elements to short presentations. These vignettes incorporate web-based video activities that contain interactive elements and typically require students to make predictions and analyze real-world phenomena.

  12. Lipopolysaccharide transport to the cell surface: biosynthesis and extraction from the inner membrane.

    PubMed

    Simpson, Brent W; May, Janine M; Sherman, David J; Kahne, Daniel; Ruiz, Natividad

    2015-10-01

    The cell surface of most Gram-negative bacteria is covered with lipopolysaccharide (LPS). The network of charges and sugars provided by the dense packing of LPS molecules in the outer leaflet of the outer membrane interferes with the entry of hydrophobic compounds into the cell, including many antibiotics. In addition, LPS can be recognized by the immune system and plays a crucial role in many interactions between bacteria and their animal hosts. LPS is synthesized in the inner membrane of Gram-negative bacteria, so it must be transported across their cell envelope to assemble at the cell surface. Over the past two decades, much of the research on LPS biogenesis has focused on the discovery and understanding of Lpt, a multi-protein complex that spans the cell envelope and functions to transport LPS from the inner membrane to the outer membrane. This paper focuses on the early steps of the transport of LPS by the Lpt machinery: the extraction of LPS from the inner membrane. The accompanying paper (May JM, Sherman DJ, Simpson BW, Ruiz N, Kahne D. 2015 Phil. Trans. R. Soc. B 370, 20150027. (doi:10.1098/rstb.2015.0027)) describes the subsequent steps as LPS travels through the periplasm and the outer membrane to its final destination at the cell surface.

  13. Identifying 21st Century STEM Competencies Using Workplace Data

    NASA Astrophysics Data System (ADS)

    Jang, Hyewon

    2016-04-01

    Gaps between science, technology, engineering, and mathematics (STEM) education and required workplace skills have been identified in industry, academia, and government. Educators acknowledge the need to reform STEM education to better prepare students for their future careers. We pursue this growing interest in the skills needed for STEM disciplines and ask whether frameworks for 21st century skills and engineering education cover all of important STEM competencies. In this study, we identify important STEM competencies and evaluate the relevance of current frameworks applied in education using the standardized job-specific database operated and maintained by the US Department of Labor. Our analysis of the importance of 109 skills, types of knowledge and work activities, revealed 18 skills, seven categories of knowledge, and 27 work activities important for STEM workers. We investigate the perspectives of STEM and non-STEM job incumbents, comparing the importance of each skill, knowledge, and work activity for the two groups. We aimed to condense dimensions of the 52 key areas by categorizing them according to the Katz and Kahn (1978) framework and testing for inter-rater reliability. Our findings show frameworks for 21st century skills and engineering education do not encompass all important STEM competencies. Implications for STEM education programs are discussed, including how they can bridge gaps between education and important workplace competencies.

  14. A Survey of Complex Object Technologies for Digital Libraries

    NASA Technical Reports Server (NTRS)

    Nelson, Michael L.; Argue, Brad; Efron, Miles; Denn, Sheila; Pattuelli, Maria Cristina

    2001-01-01

    Many early web-based digital libraries (DLs) had implicit assumptions reflected in their architecture that the unit of focus in the DL (frequently "reports" or "e-prints") would only be manifested in a single, or at most a few, common file formats such as PDF or PostScript. DLs have now matured to the point where their contents are commonly no longer simple files. Complex objects in DLs have emerged from in response to various requirements, including: simple aggregation of formats and supporting files, bundling additional information to aid digital preservation, creating opaque digital objects for e-commerce applications, and the incorporation of dynamic services with the traditional data files. We examine a representative (but not necessarily exhaustive) number of current and recent historical web-based complex object technologies and projects that are applicable to DLs: Aurora, Buckets, ComMentor, Cryptolopes, Digibox, Document Management Alliance, FEDORA, Kahn-Wilensky Framework Digital Objects, Metadata Encoding & Transmission Standard, Multivalent Documents, Open eBooks, VERS Encapsulated Objects, and the Warwick Framework.

  15. A European Mars Simulation Wind Tunnel Facility

    NASA Astrophysics Data System (ADS)

    Merrison, J. P.; Gunnlaugsson, H. P.; Knak-Jensen, S.; Per, N.

    2010-12-01

    We present details of a recently completed European simulation wind tunnel facility which is capable of re-creating the environmental conditions at the surface of Mars, this new addition complements several other large scale simulation facilities at Aarhus University in Denmark. It will be used for the multi-disciplinary scientific study of aerosol formation and transport (on Mars and earth), granular electrification, magnetic properties, erosion, cohesion/adhesion, water transport, UV induced mineralogy, bacterial survival and many others. It will be accessible to international collaborators and space agencies for instrument testing, calibration and qualification. It has been financed by the European space agency (ESA) as well as the Aarhus University Science Faculty and the Villum Kahn Rasmussen fund. The facility consists of a 50m3 environmental chamber capable of low pressure operation (0.02-1000mbar) and cryogenic temperatures (-130°C up to +60°C). This chamber houses a re-circulating wind tunnel able to generate wind speeds up to 25m/s and an automated dust injection system has been developed to produce suspended particulates (aerosols). It employs a unique LED based optical illumination system (solar simulator) and an advanced network based control system. Laser based optoelectronic instrumentation is used to quantify and monitor dust suspension and deposition. This involves a commercial Laser Doppler Anemometer and specially developed instrument prototypes constructed at Aarhus University. Photograph of the new (European) Environmental Wind Tunnel Facility.

  16. A Flipped Pedagogy for Expert Problem Solving

    NASA Astrophysics Data System (ADS)

    Pritchard, David

    The internet provides free learning opportunities for declarative (Wikipedia, YouTube) and procedural (Kahn Academy, MOOCs) knowledge, challenging colleges to provide learning at a higher cognitive level. Our ``Modeling Applied to Problem Solving'' pedagogy for Newtonian Mechanics imparts strategic knowledge - how to systematically determine which concepts to apply and why. Declarative and procedural knowledge is learned online before class via an e-text, checkpoint questions, and homework on edX.org (see http://relate.mit.edu/physicscourse); it is organized into five Core Models. Instructors then coach students on simple ``touchstone problems'', novel exercises, and multi-concept problems - meanwhile exercising three of the four C's: communication, collaboration, critical thinking and problem solving. Students showed 1.2 standard deviations improvement on the MIT final exam after three weeks instruction, a significant positive shift in 7 of the 9 categories in the CLASS, and their grades improved by 0.5 standard deviation in their following physics course (Electricity and Magnetism).

  17. Moisture sensors 1980 on-line roles increase

    SciTech Connect

    Bailey, S.J.

    1980-09-01

    A review of on- and off-line moisture and humidity sensors covers instruments based on the capacitive principle such as Panametrics' Aquamax II and those developed by Ondyne, Moisture Control Systems, Phys-Chemical Research Corp., Shaw Instruments, and Diversified Engineering; instruments based on the microwave plus gamma and nuclear plus gamma radiation principles such as those by Kay-Ray and Ohmart Corp., respectively; sensors based on the saturated salt principle such as Foxboro's self-heated lithium chloride sensor; Kahn and Co.'s electrolytic hygrometer for monitoring the moisture content of pure gases or gas mixtures in natural gas transmissions; the Ohaus gravimetric instrument; microprocessor-based titrators by Foxboro Analytical and Photovolt Corp.; instruments which sense moving web moisture such as Beckman Instrument's Hygroline System HMP20 and Hy-Cal Engineering's sensor; IR stack gas analyzers by Anarad Inc. and Moisture Systems Corp.; optical hygrometers by EG and G and General Eastern; Panametrics' Model 4000 moisture computer; and Du Pont's standard 560 analyzer and new controller.

  18. Testing Clinical Scores to Diagnose Incident Deep Vein Thrombosis in Patients Hospitalized in a Department of Medicine: Can Biomarkers Improve Accuracy?

    PubMed

    Malatino, Lorenzo; Cardella, Antonella M; Puccia, Giuseppe; Cilia, Chiara; Terranova, Valentina; Cataudella, Emanuela; Buonacera, Agata; Tripepi, Giovanni; Di Marca, Salvatore; Mastrosimone, Gianluca; Pisano, Marcella; Giordano, Mauro; Stancanelli, Benedetta

    2016-03-01

    Shifting the context from the emergency department to the department of medicine, we compared different scores to diagnose deep vein thrombosis (DVT) in patients with several comorbidities, hospitalized in a department of internal medicine. We prospectively recruited 178 consecutive hospitalized patients in whom clinical suspicion of DVT was assessed by Wells modified score for DVT, Hamilton, Kahn, and St Andrè Hospital scores. Deep vein thrombosis was confirmed in 85 (48%) patients by both echocolor Doppler and angiocomputed tomography scan. The use of risk scores based on symptoms and clinical signs was weakly useful (area under the curve [AUC]: 0.69, positive predictive value: 59%, and negative predictive value: 74%). Patients with DVT had significantly (P < .0001) lower serum albumin and protein S levels compared to those without DVT. Moreover, serum protein S (AUC: 0.82) and albumin in percentage (AUC: 0.80) showed a better accuracy than clinical scores (P < .001) in assessing the diagnosis of DVT. Therefore, serum albumin and protein S improved the accuracy of clinical scores for the diagnosis of incident DVT in patients hospitalized in a department of medicine.

  19. Professional burnout as the state and process--what to do?

    PubMed

    Rakovec-Felser, Zlatka

    2011-06-01

    The professional staff in human service institutions is often required to spend time in intense involvement with other people. Frequently, the staff-client interaction is centred around the client's current problems (psychological, social, and/ or physical) and is therefore charged with feelings of anger, embarrassment, fear or despair In this article we follow the burnout which could not be only the consequence of such job characteristics but could appear also as the result of type of work organization, social relationships, and some bodies personal characteristics as life style, too. Moreover, it can be a consequence of a disturbed balance between give and take at all three levels of social exchange--at interpersonal, at the team, and at the organizational level. So burnout is not only the problem of individuals but also the problem of social environment in which they work. The workplaces shape how people interact with another and how they carry out their jobs. In addition, we try to find the ways how to prevent or to reduce burnout, too. So we present the theories of social comparison (Festinger, 1954; Schachter, 1959), equity theory (Walster and Berscheid, 1978), as also the Kahn's model of employee engagement (1990) and the Schaufeli- Buunk's integrative comprehensive social exchange model (1993) as the possible key to help individuals and organization. In this context V. also Frankl's logo therapy (sense of purpose, 1960) became much more important as the theories of positive (Seligman, 2000) and humanistic psychology (Maslow, 1971, 1987; Rogers, 1959), too. PMID:21755734

  20. Polarized radio emission from extensive air showers measured with LOFAR

    SciTech Connect

    Schellart, P.; Buitink, S.; Corstanje, A.; Enriquez, J.E.; Falcke, H.; Hörandel, J.R.; Krause, M.; Nelles, A.; Rachen, J.P.; Veen, S. ter; Thoudam, S.

    2014-10-01

    We present LOFAR measurements of radio emission from extensive air showers. We find that this emission is strongly polarized, with a median degree of polarization of nearly 99%, and that the angle between the polarization direction of the electric field and the Lorentz force acting on the particles, depends on the observer location in the shower plane. This can be understood as a superposition of the radially polarized charge-excess emission mechanism, first proposed by Askaryan and the geomagnetic emission mechanism proposed by Kahn and Lerche. We calculate the relative strengths of both contributions, as quantified by the charge-excess fraction, for 163 individual air showers. We find that the measured charge-excess fraction is higher for air showers arriving from closer to the zenith. Furthermore, the measured charge-excess fraction also increases with increasing observer distance from the air shower symmetry axis. The measured values range from (3.3± 1.0)% for very inclined air showers at 25 m to (20.3± 1.3)% for almost vertical showers at 225 m. Both dependencies are in qualitative agreement with theoretical predictions.

  1. Dual Mode Inverter Control Test Verification

    SciTech Connect

    Bailey, J.M.

    2001-04-25

    Permanent Magnet Motors with either sinusoidal back emf (permanent magnet synchronous motor [PMSM]) or trapezoidal back emf (brushless dc motor [BDCM]) do not have the ability to alter the air gap flux density (field weakening). Since the back emf increases with speed, the system must be designed to operate with the voltage obtained at its highest speed. Oak Ridge National Laboratory's (ORNL) Power Electronics and Electric Machinery Research Center (PEEMRC) has developed a dual mode inverter controller (DMIC) that overcomes this disadvantage. This report summarizes the results of tests to verify its operation. The standard PEEMRC 75 kW hard-switched inverter was modified to implement the field weakening procedure (silicon controlled rectifier enabled phase advance). A 49.5 hp motor rated at 2800 rpm was derated to a base of 400 rpm and 7.5 hp. The load developed by a Kahn Industries hydraulic dynamometer, was measured with a MCRT9-02TS Himmelstein and Company torque meter. At the base conditions a current of 212 amperes produced the 7.5 hp. Tests were run at 400, 1215, and 2424 rpm. In each run, the current was no greater than 214 amperes. The horsepower obtained in the three runs were 7.5, 9.3, and 8.12. These results verified the basic operation of the DMIC in producing a Constant Power Speed Ratios (CPSR) of six.

  2. Stiefel-Whitney classes of curve covers

    NASA Astrophysics Data System (ADS)

    Selander, Björn

    2016-10-01

    Let D be a Dedekind scheme with the characteristic of all residue fields not equal to 2. To every tame cover Cto D with only odd ramification we associate a second Stiefel-Whitney class in the second cohomology with mod 2 coefficients of a certain tame orbicurve [D] associated to D. This class is then related to the pull-back of the second Stiefel-Whitney class of the push-forward of the line bundle of half of the ramification divisor. This shows (indirectly) that our Stiefel-Whitney class is the pull-back of a sum of cohomology classes considered by Esnault, Kahn and Viehweg in `Coverings with odd ramification and Stiefel-Whitney classes'. Perhaps more importantly, in the case of a proper and smooth curve over an algebraically closed field, our Stiefel-Whitney class is shown to be the pull-back of an invariant considered by Serre in `Revêtements à ramification impaire et thêta-caractéristiques', and in this case our arguments give a new proof of the main result of that article.

  3. X-ray crystallographic and tungsten-183 nuclear magnetic resonance structural studies of the [M4(H2O)2(XW9O34) 2]10- heteropolyanions (M = COII or Zn, X = P or As)

    USGS Publications Warehouse

    Evans, H.T.; Tourne, C.M.; Tourne, G.F.; Weakley, T.J.R.

    1986-01-01

    The crystal structures of K10[Co4(H2O)2(PW9O 34)2]??22H2O (1) and isomorphous K10[Zn4(H2O)2(AsW9O 34)2]??23H2O (2) have been determined {Mo-K?? radiation, space group P21/n, Z = 2; (1) a = 15.794(2), b = 21.360(2), c = 12.312(1) A??, ?? = 91.96??, R = 0.084 for 3 242 observed reflections [I ??? 3??(I)]; (2) a = 15.842(4), b = 21.327(5), c = 12.308(4) A??, ?? = 92.42(4)??, R = 0.066 for 4 675 observed reflections [F ??? 3??(F)]}. The anions have crystallographic symmetry 1 and non-crystallographic symmetry very close to 2/m (C2h). Each consists of two [XW9O34]9- moieties [??-B isomers; X = P (1) or As (2)] linked via four CoIIO6 or ZnO6 groups. Two Co or Zn atoms each carry a water ligand. The 183W n.m.r. spectra of the anions [Zn4(H2O)2(XW9O34) 2]10- (X = P or As) confirm that the anions retain 2/m symmetry in aqueous solution. Homonuclear coupling constants between 183W atoms are 5.8-9.0 Hz for adjacent WO6 octahedra sharing edges, and 19.6-25.0 Hz for octahedra sharing corners.

  4. The crystal structure and thermal history of orthopyroxene from lunar anorthosite 15415

    USGS Publications Warehouse

    Evans, H.T.; Stephen, Huebner J.; Konnert, J.A.

    1978-01-01

    A single crystal of untwinned orthopyroxene from lunar anorthosite sample 15415, with composition (Mg1.14Fe0.80Mn0.02Ca0.04)(Si1.97Al0.03)O6, has a unit cell in space group Pbca with a = 18.310(15) A ??, b = 8.904(10) A ??, c = 5.214(7) A ??, containing 2 formula units. A set of 742 counter-measured intensity data made with MoK?? radiation has been used to refine the crystal structure in isotropic thermal mode to R = 0.116. Anisotropic refinement led to R = 0.092, but thermal parameters are distorted by non-random errors resulting from poor crystal texture. The resulting structure is in close agreement with that obtained by Ghose [9] for a hypersthene from Greenland. A parameter q, which gives (MgqFe1-q) for cation site M(1) and (Mg1.14-qFeq-0.18Ca0.04) for site M(2), was included in the least-squares analysis, yielding q = 0.90(1). This orthopyroxene has the high degree of cation order expected of pyroxenes subjected to Apollonian metamorphism at lower than 500-600??C. No evidence exists for a subsequent thermal event of sufficient intensity to disorder the pyroxene. On the basis of previous laboratory studies of argon-release patterns of lunar plagioclase and order-disorder kinetics of terrestrial pyroxenes, we attribute the reported isotopic age (3.9-4.1 AE) to cessation of metamorphism, perhaps caused by impact excavation. ?? 1978.

  5. Complete sequence of a F2:A-:B- plasmid pHN3A11 carrying rmtB and qepA, and its dissemination in China.

    PubMed

    Chen, Xiaojie; He, Liangying; Li, Yugu; Zeng, Zhenling; Deng, Yuting; Liu, Yahong; Liu, Jian-Hua

    2014-11-01

    Previous studies have confirmed that the spread of rmtB and qepA was mainly mediated by similar F2:A-:B- plasmids. In this study, a representative rmtB and qepA-harbouring F2:A-:B- plasmid, pHN3A11, originating from an Escherichia coli strain of feline origin, was fully sequenced and compared with other IncFII plasmids. pHN3A11 is 76,626bp long with a backbone similar to that of the IncFII plasmids obtained from China (pHK23a, pFOS-HK151325, pXZ) and Canada (pC15-1a). It contains genes encoding addiction (pemI/pemK, hok/mok/sok) and partitioning (parM, parB, and stbB) systems that promote plasmid maintenance during vertical transmission. rmtB, qepA, blaTEM-1, and dfr were found in previously observed contexts, interspersed with different complete or truncated insertion sequences and transposons (ΔIS1, ΔTn2, ΔintI1, ISCR3, 3 IS26, Tn21). Further analyses confirmed that pHN3A11-like plasmids have disseminated in E. coli isolates from pets, food animals and farm environments in China. The successful dissemination of F2:A-:B- type multidrug resistant plasmid among animals may represent a public health risk, and may further worsen the clinical impact. PMID:25236985

  6. Entangled coordination polymers with mixed N- and O-donor organic linkers: a case of module-matching priority.

    PubMed

    Han, Li-Wei; Gong, Yun; Lin, Zu-Jin; Lü, Jian; Cao, Rong

    2012-04-14

    A series of four coordination polymers showing entangled architectures based on cobalt and mixed N-donor/O-donor ligands, namely [Co(4,4'-BPIPA)(TP)]·2DMF (1), [Co(4,4'-BPIPA)(2,6-NDC)(DMF)]·DMF (2), [Co(4,4'-BPIPA)(2,6-NDC)]·2DMF (3) and [Co(4,4'-BPIPA)(4,4'-BPDC)]·2DMF (4) (4,4'-BPIPA = N,N'-bis-4-pyridinyl-isophthalamide, TP = terephthalic acid, 2,6-NDC = 2,6-naphthalenedicarboxylic acid, 4,4'-BPDC = 4,4'-biphenyldicarboxylic acid), have been synthesized under solvothermal conditions. Complex 1, containing 4,4'-BPIPA and relatively short dicarboxylate ligands (TP), exhibits two-dimensional (2D) two-fold interpenetration of double wavy 4(4)-sql nets. Complex 2 displays interesting 2D→3D parallel polycatenation of undulated 2D 4(4)-sql layers built by 4,4'-BPIPA and moderate dicarboxylate ligands (2,6-NDC). Complexes 3 and 4, although constructed of dicarboxylate ligands with different lengths (moderate 2,6-NDC and long 4,4'-BPDC), possess similar 3-fold interpenetration of identical self-catenated single nets with 6(5)·8-mok topologies. It has been found that the length of the dicarboxylate ligands plays a key role of module-matching in the self-assemblies of complexes 1-4. Moreover, the effect of the conformations of 4,4'-BPIPA, which can be controlled by tuning reaction temperatures, is also discussed.

  7. The identification and quantification of phospholipids from Thermus and Meiothermus bacteria.

    PubMed

    Lagutin, Kirill; MacKenzie, Andrew; Houghton, Karen M; Stott, Matthew B; Vyssotski, Mikhail

    2014-11-01

    Structural identities of the major phospholipid (PL-2), minor phospholipid (PL-1) and trace phospholipid (PL-0) from representative strains of the genera Thermus and Meiothermus were established. Phospholipids were quantified using phosphorus-31 nuclear magnetic resonance ((31)P-NMR). The structures of the major phospholipid (PL-2) from Thermus filiformis MOK14.7 and Meiothermus ruber WRG6.9 were identified as 2'-O-(1,2-diacyl-sn-glycero-3-phospho)-3'-O-(α-N-acetylglucosaminyl)-N-glyceroyl alkylamine (GlcNAc-PGAA) and 2'-O-(2-acylalkyldiol-1-O-phospho)-3'-O-(α-N-acetylglucosaminyl)-N-glyceroyl alkylamine (GlcNAc-diolPGAA). Interestingly, M. ruber contained only a diacyl form of GlcNAc-PGAA (87 %), while T. filiformis contained both GlcNAc-PGAA (59 %) and GlcNAc-diolPGAA (18 %). The structures of the minor phospholipid (PL-1) were established as 2'-O-(1,2-diacyl-sn-glycero-3-phospho)-3'-O-(α-glucosaminyl)-N-glyceroyl alkylamine (GlcN-PGAA, 13 %) in T. filiformis and 2'-O-(1,2-diacyl-sn-glycero-3-phospho)-3'-O-(α-galactosaminyl)-N-glyceroyl alkylamine (GalN-PGAA, 19 %) in M. ruber. This is the first reliable discovery of phosphatidylglyceroylalkylamines modified by glucosamine or galactosamine with a free amino group. No signs of diol-based phosphatidylglyceroylalkylamines were found in PL-1 phospholipids. Similar to PL-2, trace phospholipid (PL-0) from T. filiformis contained both unsubstituted diol-based phosphatidylglyceroylalkylamine (diolPGAA) and PGAA, while M. ruber contained only free PGAA. Unlike analysis using TLC, the diol form of phosphatidylglyceroylalkylamines is clearly resolved from the diacyl form via (31)P-NMR. PMID:25204578

  8. Martian North Polar Water-Ice Clouds During the Viking Era

    NASA Technical Reports Server (NTRS)

    Tamppari, L. K.; Bass, D. S.

    2000-01-01

    The Viking Orbiters determined that the surface of Mars' northern residual cap consists of water ice. Observed atmospheric water vapor abundances in the equatorial regions have been related to seasonal exchange between reservoirs such as the polar caps, the regolith and between different phases in the atmosphere. Kahn modeled the physical characteristics of ice hazes seen in Viking Orbiter imaging limb data, hypothesizing that ice hazes provide a method for scavenging water vapor from the atmosphere and accumulating it into ice particles. Given that Jakosky found that these particles had sizes such that fallout times were of order one Martian sol, these water-ice hazes provided a method for returning more water to the regolith than that provided by adsorption alone. These hazes could also explain the rapid hemispheric decrease in atmospheric water in late northern summer as well as the increase during the following early spring. A similar comparison of water vapor abundance versus polar cap brightness has been done for the north polar region. They have shown that water vapor decreases steadily between L(sub s) = 100-150 deg while polar cap albedo increases during the same time frame. As a result, they suggested that late summer water-ice deposition onto the ice cap may be the cause of the cap brightening. This deposition could be due to adsorption directly onto the cap surface or to snowfall. Thus, an examination of north polar waterice clouds could lend insight into the fate of the water vapor during this time period. Additional information is contained in the original extended abstract.

  9. Deformation and fracture of thin sheet aluminum-lithium alloys: The effect of cryogenic temperatures

    NASA Technical Reports Server (NTRS)

    Wagner, John A.; Gangloff, Richard P.

    1990-01-01

    The objective is to characterize the fracture behavior and to define the fracture mechanisms for new Al-Li-Cu alloys, with emphasis on the role of indium additions and cryogenic temperatures. Three alloys were investigated in rolled product form: 2090 baseline and 2090 + indium produced by Reynolds Metals, and commercial AA 2090-T81 produced by Alcoa. The experimental 2090 + In alloy exhibited increases in hardness and ultimate strength, but no change in tensile yield strength, compared to the baseline 2090 composition in the unstretched T6 condition. The reason for this behavior is not understood. Based on hardness and preliminary Kahn Tear fracture experiments, a nominally peak-aged condition was employed for detailed fracture studies. Crack initiation and growth fracture toughness were examined as a function of stress state and microstructure using J(delta a) methods applied to precracked compact tension specimens in the LT orientation. To date, J(delta a) experiments have been limited to 23 C. Alcoa 2090-T81 exhibited the highest toughness regardless of stress state. Fracture was accompanied by extensive delamination associated with high angle grain boundaries normal to the fatigue precrack surface and progressed microscopically by a transgranular shear mechanism. In contrast the two peak-aged Reynolds alloys had lower toughness and fracture was intersubgranular without substantial delamination. The influences of cryogenic temperature, microstructure, boundary precipitate structure, and deformation mode in governing the competing fracture mechanisms will be determined in future experiments. Results contribute to the development of predictive micromechanical models for fracture modes in Al-Li alloys, and to fracture resistant materials.

  10. Optical and X-Ray Observations of the Western Edge of the Cygnus Loop

    NASA Astrophysics Data System (ADS)

    Levenson, N. A.; Graham, J. R.; Hester, J. J.; Petre, R.; Raymond, J. C.

    1994-12-01

    The western edge of the Cygnus Loop supernova remnant provides an important opportunity to study blast wave--interstellar cloud interactions. On the western edge of the Loop is an extensive coherent network of bright optical filaments from fast radiative shocks. This region is unique within the Cygnus Loop, because the remnant appears to be running into a large molecular cloud in this direction. To study this interaction we have obtained deep wide-field optical line images and X-ray observations with the ROSAT High Resolution Imager. The optical data show a variety of shocks, including non-radiative Balmer-line filaments, incomplete shocks, and shocks with complete cooling and recombination zones. The ROSAT-HRI data show bright, sharply limb-brightened X-rays confined behind the edge of the shock front delineated by the optical filaments. The Einstein-IPC data at this location has been interpreted as an enhancement due to thermal evaporation (Charles et al. 1985). Comparison of the optical and X-ray data sugests that the western limb geometry is simple. If there is evaporation, it must occur across a surface defined by a radiative shock, which contains very strong, highly ordered magnetic fields aligned in the plane of the shock. An alternative explanation for the coincidence of the bright X-rays and the radiative filaments is that compression of the post-blast wave gas by a reverse shock results in increased brightness. In either case, because of the simple geometry in this region, the X-ray emission behind the blast wave offers perhaps the clearest evidence of the structure of the post-blast wave medium in any middle-aged remnant. Charles, P. A., Kahn, S. M., and McKee, C. F. 1985 ApJ 295 456

  11. Assessment of Flood Disaster Impacts in Cambodia: Implications for Rapid Disaster Response

    NASA Astrophysics Data System (ADS)

    Ahamed, Aakash; Bolten, John; Doyle, Colin

    2016-04-01

    Disaster monitoring systems can provide near real time estimates of population and infrastructure affected by sudden onset natural hazards. This information is useful to decision makers allocating lifesaving resources following disaster events. Floods are the world's most common and devastating disasters (UN, 2004; Doocy et al., 2013), and are particularly frequent and severe in the developing countries of Southeast Asia (Long and Trong, 2001; Jonkman, 2005; Kahn, 2005; Stromberg, 2007; Kirsch et al., 2012). Climate change, a strong regional monsoon, and widespread hydropower construction contribute to a complex and unpredictable regional hydrodynamic regime. As such, there is a critical need for novel techniques to assess flood impacts to population and infrastructure with haste during and following flood events in order to enable governments and agencies to optimize response efforts following disasters. Here, we build on methods to determine regional flood extent in near real time and develop systems that automatically quantify the socioeconomic impacts of flooding in Cambodia. Software developed on cloud based, distributed processing Geographic Information Systems (GIS) is used to demonstrate spatial and numerical estimates of population, households, roadways, schools, hospitals, airports, agriculture and fish catch affected by severe monsoon flooding occurring in the Cambodian portion of Lower Mekong River Basin in 2011. Results show modest agreement with government and agency estimates. Maps and statistics generated from the system are intended to complement on the ground efforts and bridge information gaps to decision makers. The system is open source, flexible, and can be applied to other disasters (e.g. earthquakes, droughts, landslides) in various geographic regions.

  12. Cadmium distribution in sediment and the lugworm Arenicola marina in a low concentration exposure experiment

    SciTech Connect

    Everaarts, J.M.; SaralaDevi, K.

    1996-12-31

    In the central and southern North Sea, and in the Dutch coastal zone, total cadmium (Cd) concentrations in water are 0.02 {+-} 0.01 {mu}g/L and 0.06 {+-} 0.02 {mu}g/L, respectively Cadmium in the estuarine waters of the Dutch Wadden Sea varied from 0.3 {+-} 0.01 {mu}g/L in the western part to 0.08 {+-} 0.03 {mu}g/L in the eastern part. In whole sediment, the Cd background concentration for the Wadden Sea is 0.5 {+-} 0.01 {mu}g/g dry weight (dw), whereas the reference concentration is 0.08 {+-} 0.02 {mu}g/g dw. The concentrations of total-Cd in surface bulk sediments (0-2 cm) of the central North Sea (Oyster Grounds), and of intertidal mud-flats in the western Wadden Sea varied from 0.05 to 0.15 {mu}g/g dw and from 0.13 to 0.46 {mu}g dw, respectively (calculated from Kahn et al. 1992). These concentration ranges match the reference Cd concentration for Wadden Sea whole sediment (0.5 {+-} 0.01) {mu}g/g dw. Cadmium concentrations in surface sediments of the Dutch coastal zone and estuaries are only slightly elevated compared to the 0.2 {mu}g/g dw, considered as the background concentrations in pristine areas, but well below the level of 10 {mu}g/g dw at heavily contaminated sites. This laboratory study reports on the distribution of cadmium in the sediment column, and the uptake in the blood/coelomic fluid, intestine and body-wall of lugworms at low cadmium concentration exposure. The aim was to determine possible interaction between the vertical distribution of sediment-bound cadmium and the bioturbating activity of lugworms. 14 refs., 3 figs., 2 tabs.

  13. Using a Data Quality Framework to Clean Data Extracted from the Electronic Health Record: A Case Study

    PubMed Central

    Dziadkowiec, Oliwier; Callahan, Tiffany; Ozkaynak, Mustafa; Reeder, Blaine; Welton, John

    2016-01-01

    Objectives: We examine the following: (1) the appropriateness of using a data quality (DQ) framework developed for relational databases as a data-cleaning tool for a data set extracted from two EPIC databases, and (2) the differences in statistical parameter estimates on a data set cleaned with the DQ framework and data set not cleaned with the DQ framework. Background: The use of data contained within electronic health records (EHRs) has the potential to open doors for a new wave of innovative research. Without adequate preparation of such large data sets for analysis, the results might be erroneous, which might affect clinical decision-making or the results of Comparative Effectives Research studies. Methods: Two emergency department (ED) data sets extracted from EPIC databases (adult ED and children ED) were used as examples for examining the five concepts of DQ based on a DQ assessment framework designed for EHR databases. The first data set contained 70,061 visits; and the second data set contained 2,815,550 visits. SPSS Syntax examples as well as step-by-step instructions of how to apply the five key DQ concepts these EHR database extracts are provided. Conclusions: SPSS Syntax to address each of the DQ concepts proposed by Kahn et al. (2012)1 was developed. The data set cleaned using Kahn’s framework yielded more accurate results than the data set cleaned without this framework. Future plans involve creating functions in R language for cleaning data extracted from the EHR as well as an R package that combines DQ checks with missing data analysis functions. PMID:27429992

  14. Role for AMP-activated protein kinase in glucose-stimulated insulin secretion and preproinsulin gene expression.

    PubMed Central

    da Silva Xavier, Gabriela; Leclerc, Isabelle; Varadi, Aniko; Tsuboi, Takashi; Moule, S Kelly; Rutter, Guy A

    2003-01-01

    AMP-activated protein kinase (AMPK) has recently been implicated in the control of preproinsulin gene expression in pancreatic islet beta-cells [da Silva Xavier, Leclerc, Salt, Doiron, Hardie, Kahn and Rutter (2000) Proc. Natl. Acad. Sci. U.S.A. 97, 4023-4028]. Using pharmacological and molecular strategies to regulate AMPK activity in rat islets and clonal MIN6 beta-cells, we show here that the effects of AMPK are exerted largely upstream of insulin release. Thus forced increases in AMPK activity achieved pharmacologically with 5-amino-4-imidazolecarboxamide riboside (AICAR), or by adenoviral overexpression of a truncated, constitutively active form of the enzyme (AMPK alpha 1.T(172)D), blocked glucose-stimulated insulin secretion. In MIN6 cells, activation of AMPK suppressed glucose metabolism, as assessed by changes in total, cytosolic or mitochondrial [ATP] and NAD(P)H, and reduced increases in intracellular [Ca(2+)] caused by either glucose or tolbutamide. By contrast, inactivation of AMPK by expression of a dominant-negative form of the enzyme mutated in the catalytic site (AMPK alpha 1.D(157)A) did not affect glucose-stimulated increases in [ATP], NAD(P)H or intracellular [Ca(2+)], but led to the unregulated release of insulin. These results indicate that inhibition of AMPK by glucose is essential for the activation of insulin secretion by the sugar, and may contribute to the transcriptional stimulation of the preproinsulin gene. Modulation of AMPK activity in the beta-cell may thus represent a novel therapeutic strategy for the treatment of type 2 diabetes mellitus. PMID:12589707

  15. Outcome among community dwelling older adults with schizophrenia: results using five conceptual models.

    PubMed

    Cohen, Carl I; Pathak, Richa; Ramirez, Paul M; Vahia, Ipsit

    2009-04-01

    There have been few studies examining the outcome of schizophrenia in later life. Using five conceptual models, we test two hypotheses with respect to range of outcomes among older schizophrenia outpatients and how they compare to their age peers in the community. We operationalized five outcome measures from the following conceptual models: Remission, adapting criteria of Andreasen et al. (The American Journal of Psychiatry, 162:441-449, 2005); Recovery, adapting the criteria by Liberman et al. (International Review of Psychiatry, 14:256-272, 2002); Community Integration using the model of Wong and Solomon (Mental Health Services Research, 4:13-28, 2002); Subjective and Objective Successful Aging using the model of Rowe and Kahn (Science, 237:143-149, 1987). The schizophrenia (S) group consisted of 198 community-dwelling persons aged 55 and over who developed schizophrenia before age 45 and a community comparison (CC) group (N = 113). Remission and recovery criteria were met by 49 and 17% of the S group, respectively. There were significant differences between the S and CC groups in the distribution of community integration and successful aging scales: 41% of the CC group met at least 10 of 12 criteria versus 23% of the S group on the Community Integration Scale; 19% of the CC group met all six criteria vs. 2% of the S group on the Objective Successful Aging Scale; 27% of the CC group vs. 13% of the S group met all six criteria on the Subjective Successful Aging Scale. Correlations among the five outcome measures ranged from r = .19 to .48 (median value: r = .26 or 7% shared variance). There is wide variability in outcome in later life depending on which measure is used. Rather than one universal indicator, each measure offers a different perspective that can provide useful guidelines for researchers, clinicians, and policy makers. PMID:18787951

  16. How faceted liquid droplets grow tails: from surface topology to active motion

    NASA Astrophysics Data System (ADS)

    Sloutskin, Eli

    Among all possible shapes of a volume V, a sphere has the smallest surface area A. Therefore, liquid droplets are spherical, minimizing their interfacial energy γA for a given interfacial tension γ > 0 . This talk will demonstrate that liquid oil (alkane) droplets in water, stabilized by a common surfactant can be temperature-tuned to adopt icosahedral and other faceted shapes, above the bulk melting temperature of the oil. Although emulsions have been studied for centuries no faceted liquid droplets have ever been reported. The formation of an icosahedral shape is attributed to the interplay between γ and the elastic properties of the interfacial monomolecular layer, which crystallizes here 10-15K above bulk melting, leaving the droplet's bulk liquid. The icosahedral symmetry is dictated by twelve five-fold topological defects, forming within the hexagonally-packed interfacial crystalline monolayer. Moreover, we demonstrate that upon further cooling this `interfacial freezing' effect makes γ transiently switch its sign, leading to a spontaneous splitting of droplets and an active growth of their surface area, reminiscent of the classical spontaneous emulsification, yet driven by completely different physics. The observed phenomena allow deeper insights to be gained into the fundamentals of molecular elasticity and open new vitas for a wide range of novel nanotechnological applications, from self-assembly of complex shapes to new delivery strategies in bio-medicine. Acknowledgment is made to the Donors of the American Chemical Society Petroleum Research Fund for support of this research and to the Kahn Foundation for the purchase of equipment.

  17. Local dark matter and dark energy as estimated on a scale of ~1 Mpc in a self-consistent way

    NASA Astrophysics Data System (ADS)

    Chernin, A. D.; Teerikorpi, P.; Valtonen, M. J.; Dolgachev, V. P.; Domozhilova, L. M.; Byrd, G. G.

    2009-12-01

    Context: Dark energy was first detected from large distances on gigaparsec scales. If it is vacuum energy (or Einstein's Λ), it should also exist in very local space. Here we discuss its measurement on megaparsec scales of the Local Group. Aims: We combine the modified Kahn-Woltjer method for the Milky Way-M 31 binary and the HST observations of the expansion flow around the Local Group in order to study in a self-consistent way and simultaneously the local density of dark energy and the dark matter mass contained within the Local Group. Methods: A theoretical model is used that accounts for the dynamical effects of dark energy on a scale of ~1 Mpc. Results: The local dark energy density is put into the range 0.8-3.7ρv (ρv is the globally measured density), and the Local Group mass lies within 3.1-5.8×1012 M⊙. The lower limit of the local dark energy density, about 4/5× the global value, is determined by the natural binding condition for the group binary and the maximal zero-gravity radius. The near coincidence of two values measured with independent methods on scales differing by ~1000 times is remarkable. The mass ~4×1012 M⊙ and the local dark energy density ~ρv are also consistent with the expansion flow close to the Local Group, within the standard cosmological model. Conclusions: One should take into account the dark energy in dynamical mass estimation methods for galaxy groups, including the virial theorem. Our analysis gives new strong evidence in favor of Einstein's idea of the universal antigravity described by the cosmological constant.

  18. [Population growth and the environment].

    PubMed

    Hogan, D J

    1991-01-01

    The impact of population growth on the enviornment has been extensively researched; it consists of the depletion of resources (agricultural land absorbed by urban expansion, loss of soils, desertification, loss of biodiversity, less availability of minerals, dwindling of petroleum reserves) and the degradation of natural resources (air and water pollution). For politicians, journalists, and environmentalists, population growth is identified as the principal villain, which is a unidirectional and negative opinion. Demography is supposed to examine the negative and positive effects of the environment-population relationship; however, it is postulated that there has not been much produced in the last 2 centuries in this area. Examination of the research literature does not indicate any view that transcends the Malthusian vision, although a few empirical studies exist (Hogan, 1989). Durham (1979) identified the replacement of subsistence agriculture by export-oriented agriculture as the key factor in overpopulation in El Salvador and Honduras that led to migrations and international conflicts. Tudela (1987) related a similar process in the Mexican state of Tabasco, where a period of malnutrition was accompanied by the expansion of export agriculture and nutritional improvements emanated only from recapturing subsistence agriculture. Fearnside (1986) researched the dynamics of the occupation and destruction of Amazonia. However, Kahn and Simon went further and denied the existence of real environmental problems: population is the ultimate resource, and the more minds, the more good ideas and solutions for any problem. However, in all these cases of pure or modified Malthusianism the relation of population/resources is reduced to a unidimensional relationship; and fertility, mortality, migration, marriage, and age structure receive little attention. A prime candidate for the attention of population specialists should be migration and patterns of settlement and their

  19. Defining Successful Aging: A Tangible or Elusive Concept?

    PubMed Central

    Martin, Peter; Kelly, Norene; Kahana, Boaz; Kahana, Eva; Willcox, Bradley J.; Willcox, D. Craig; Poon, Leonard W.

    2015-01-01

    Purpose of the Study: Everyone wants to age successfully; however, the definition and criteria of successful aging remain vague for laypersons, researchers, and policymakers in spite of decades of research on the topic. This paper highlights work of scholars who made significant theoretical contributions to the topic. Design and Methods: A thorough review and evaluation of the literature on successful aging was undertaken. Results: Our review includes early gerontological definitions of successful aging and related concepts. Historical perspectives reach back to philosophical and religious texts, and more recent approaches have focused on both process- and outcome-oriented models of successful aging. We elaborate on Baltes and Baltes’ theory of selective optimization with compensation [Baltes, P. B., & Baltes, M. M. (1990a). Psychological perspectives on successful aging: The model of selective optimization with compensation. In P. B. Baltes & M. M. Baltes (Eds.), Successful aging: Perspectives from the behavioral sciences (pp. 1–34). United Kingdom: Cambridge University Press], Kahana and Kahana’s preventive and corrective proactivity model [Kahana, E., & Kahana, B. (1996). Conceptual and empirical advances in understanding aging well through proactive adaptation. In V. Bengtson (Ed.), Adulthood and aging: Research on continuities and discontinuities (pp. 18–40). New York: Springer], and Rowe and Kahn’s model of successful aging [Rowe, J. W., & Kahn, R. L. (1998). Successful aging. New York: Pantheon Books], outlining their commonalities and differences. Additional views on successful aging emphasize subjective versus objective perceptions of successful aging and relate successful aging to studies on healthy and exceptional longevity. Implications: Additional theoretical work is needed to better understand successful aging, including the way it can encompass disability and death and dying. The extent of rapid social and technological change influencing

  20. Multiple GTP-binding proteins regulate vesicular transport from the ER to Golgi membranes

    PubMed Central

    1992-01-01

    Using indirect immunofluorescence we have examined the effects of reagents which inhibit the function of ras-related rab small GTP- binding proteins and heterotrimeric G alpha beta gamma proteins in ER to Golgi transport. Export from the ER was inhibited by an antibody towards rab1B and an NH2-terminal peptide which inhibits ARF function (Balch, W. E., R. A. Kahn, and R. Schwaninger. 1992. J. Biol. Chem. 267:13053-13061), suggesting that both of these small GTP-binding proteins are essential for the transport vesicle formation. Export from the ER was also potently inhibited by mastoparan, a peptide which mimics G protein binding regions of seven transmembrane spanning receptors activating and uncoupling heterotrimeric G proteins from their cognate receptors. Consistent with this result, purified beta gamma subunits inhibited the export of VSV-G from the ER suggesting an initial event in transport vesicle assembly was regulated by a heterotrimeric G protein. In contrast, incubation in the presence of GTP gamma S or AIF(3-5) resulted in the accumulation of transported protein in different populations of punctate pre-Golgi intermediates distributed throughout the cytoplasm of the cell. Finally, a peptide which is believed to antagonize the interaction of rab proteins with putative downstream effector molecules inhibited transport at a later step preceding delivery to the cis Golgi compartment, similar to the site of accumulation of transported protein in the absence of NSF or calcium (Plutner, H., H. W. Davidson, J. Saraste, and W. E. Balch. 1992. J. Cell Biol. 119:1097-1116). These results are consistent with the hypothesis that multiple GTP-binding proteins including a heterotrimeric G protein(s), ARF and rab1 differentially regulate steps in the transport of protein between early compartments of the secretory pathway. The concept that G protein-coupled receptors gate the export of protein from the ER is discussed. PMID:1447289

  1. Ask Me Anything - The Reddit Revolution and other Unconventional Ways to Communicate Science

    NASA Astrophysics Data System (ADS)

    Fiondella, F.; Kahn, B. L.; Noori, A.

    2012-12-01

    Instagram. Pinterest. SoundCloud. Storify. Almost every month there's a new platform through which institutions could potentially promote their work. If used effectively, these less-conventional means of communication can indeed be powerful devices to connect scientists and the general public, especially for small institutions with limited resources. We discuss our experiences on Reddit, a social news site, and Projeqt, a visual storytelling platform. We'll talk about the pros and cons of using them, and provide tips on what to do and what to avoid for those interested in having a go. Nearly 1.5 million people post on Reddit daily. One of the most active sections is "Ask Me Anything", where individuals can share expertise and insights. AMAs are essentially online town-hall style meetings. Movie stars host AMAs, as do politicians, athletes, and increasingly, scientists. In fact, the science subtopic is the 6th most subscribed on the site. Forecaster Tony Barnston, from the International Research Institute for Climate and Society hosted an AMA in June 2012. The session generated >200 comments and questions in 24 hours. Barnston was surprisingly pleased with the experience. "I liked having time to think about my answers," he said, noting this type of engagement could be attractive to scientists who might feel anxious about interacting with the public. Projeqt is a creative visual storytelling platform that allows one to integrate activity from a host of social media such as Twitter, Facebook, Flickr, Instagram, YouTube and more. In very short time, an institution can produce a beautiful visual narrative of its research and activities, combining its own in-house content with creative-commons content easily available on the web. The resulting product is itself shareable and embeddable.; Barnston in office where he took questions via Reddit. (Photo: B. Kahn) ; Photo essay about critical role that climate forecasting plays in helping to reduce vulnerability in Sahel

  2. “Successful Aging,” Gerontological Theory and Neoliberalism: A Qualitative Critique

    PubMed Central

    Rubinstein, Robert L.; de Medeiros, Kate

    2015-01-01

    This article is a critique of the successful aging (SA) paradigm as described in the Rowe and Kahn book, Successful Aging (1998). The major point of this article is that two key ideas in the book may be understood as consonant with neoliberalism, a social perspective that came into international prominence at the same time the SA paradigm was initially promoted. These two key ideas are (a) the emphasis on individual social action applied to the nature of the aging experience and (b) the failure to provide a detailed policy agenda for the social and cultural change being promoted and, particularly, for older adults who may be left behind by the approach to change the book suggests. The article provides no evidence for a direct connection between SA and neoliberalism, but rather shows how similarities in their approaches to social change characterize both of them. In sum, the article shows (a) how the implicit social theory developed in the book, in a manner similar to neoliberalism, elevates the individual as the main source of any changes that must accompany the SA paradigm and (b) the focus on SA as individual action does not provide for those older adults who do not or will not age “successfully.” This, we conclude, implicitly sets up a two-class system of older adults, which may not be an optimal means of addressing the needs of all older adults. The article also reviews a number of studies about SA and shows how these, too, may emphasize its similarities to neoliberalism and other issues that the SA paradigm does not adequately address. PMID:25161262

  3. Observing a Severe Dust Storm Event over China using Multiple Satellite Data

    NASA Astrophysics Data System (ADS)

    Xu, Hui; Xue, Yong; Guang, Jie; Mei, Linlu

    2013-04-01

    make use of all useful satellite data to observe one severe dust procedure, multi-sensor and multi-algorithm AOD data were combined. In this paper, the satellite instruments considered are MISR, MODIS, POLDER and CALIPSO. In addition, air pollution index (API) data were used to validate the satellite AOD data. We chose the study region with a longitude range from 76°N to 136°N and a latitude range from 15°E to 60°E. Index Terms—aerosol optical depth, dust, satellite REFERENCES Adhikary, B., Kulkarni, S., Dallura A., Tang, Y., Chai, T., Leung, L. R., Qian, Y., Chung, C. E., Ramanathan,V. and Carmichael, G. R., 2008, A regional scale chemical transport modeling of Asian aerosols with data assimilation of AOD observations using optimal interpolation technique, Atmospheric Environment, 42(37), 8600-8615. Carboni, E., Thomas, G. E., Sayer, A. M., Siddans, R., Poulsen, C. A., Grainger, R. G., Ahn, C., Antoine, D., Bevan, S., Braak, R., Brindley, H., DeSouza-Machado, S., Deuz'e, J. L., Diner, D., Ducos, F., Grey, W., Hsu, C., Kalashnikova, O. V., Kahn, R., North, P. R. J., Salustro, C., Smith, A., Tanr'e, D., Torres, O., and Veihelmann, B., 2012, Intercomparison of desert dust optical depth from satellite measurements, Atmospheric Measurement Techniques, 5, 1973-2002. Deuze', J. L., Bre'on, F. M., Devaux, C., Goloub, Herman, M., Lafrance, B., Maignan, F., Marchand, A.,Nadal, F., Perry, G., and Tanre', D., 2001, Remote sensing of aerosols over land surfaces from POLDER-ADEOS-1 polarized measurements, Journal of Geophysical Research, 106(D5), 4913-4926. Ehlers, M., 1991, Multisensor image fusion techniques in remote sensing, ISPRS Journal of Photogrammetry and Remote Sensing, 46, 19-30. Han, X., Ge. C., Tao, J. H., Zhang, M. G., Zhang, R. J., 2012, Air Quality Modeling for a Strong Dust Event in East Asia in March 2010, Aerosol and Air Quality Research, 12: 615-628. Hsu, N. C., Tsay, S. C., King, M. D. and Herman, J. R., 2004, Aerosol Properties over Bright

  4. Bobjonesite, V4+ O (SO4) (H2O 3, a new mineral species from Temple Mountain, Emery County, Utah, U.S.A

    USGS Publications Warehouse

    Schindler, M.; Hawthorne, F.C.; Huminicki, D.M.C.; Haynes, P.; Grice, Joel D.; Evans, H.T.

    2003-01-01

    Bobjonesite, V4+ O (SO4) (H2O 3, is a new mineral species from Temple Mountain, Emery County, Utah, U.S.A. It occurs as blue-green crusts and efflorescences in fractures in a fossil (Triassic) tree: individual crystals are ??1 mm and are intimately intergrown. Bobjonesite hydrates very easily, and is unstable in all but the driest atmosphere. Its structure was determined on a crystal of bobjonesite: however, the physical properties, optical properties and X-ray powder-diffraction pattern were recorded on the synthetic equivalent, and an electron-microprobe analysis was not possible. Bobjonesite has a pale blue streak, a vitreous luster and no observable fluorescence under ultraviolet light. It has no cleavage or parting. The Mohs hardness is ???1, and the calculated density is 2.28 g/cm3. Bobjonesite is biaxial positive, with ?? 1.555(2 , ?? 1.561(1), ?? 1.574(2), 2V(obs.) = 72(1)??, 2V(calc.) = 69??; it is non-pleochroic, X = b, Y ??? 19?? (in ?? obtuse). Bobjonesite is monoclinic, space group P21/n, cell dimensions from single-crystal data: a 7.3940(5), b 7.4111(3), c 12.0597(9) A??, ?? 106.55(1)??, V 633.5(1) A??3, Z=4. The strongest seven lines in the X-ray powder-diffraction pattern [d in A??(I)(hkl)] are as follows: 5.795(100)(002), 3.498(90)(112), 3.881(48)(1??03), 5.408(37) (101), 4.571(20)(012), 6.962(11 (1??01) and 6.254(11)(011). The chemical formula was derived from crystal-structure analysis; the end-member formula is V O (SO4) (H2O)3. The crystal structure of bobjonesite was refined to an R index of 3.6% for 1105 observed (Fo> 5??F) reflections measured with an automated four-circle X-ray diffractometer using MoK?? X-radiation. There is one V site occupied by V4+ and surrounded by three O atoms and three (H2O) groups in an octahedral arrangement, with one short vanadyl bond (1.577 A??), four similar equatorial bonds (<2.022 A??), and one longer V-O bond (2.278 A??) trans to the vanadyl bond. The structure consists of isolated [V4+2 O2 (H2O)6 (SO4

  5. Connexin 43 reboots meiosis and reseals blood-testis barrier following toxicant-mediated aspermatogenesis and barrier disruption.

    PubMed

    Li, Nan; Mruk, Dolores D; Mok, Ka-Wai; Li, Michelle W M; Wong, Chris K C; Lee, Will M; Han, Daishu; Silvestrini, Bruno; Cheng, C Yan

    2016-04-01

    support round spermatids to enter spermiogenesis.-Li, N., Mruk, D. D., Mok, K.-W., Li, M. W. M., Wong, C. K. C., Lee, W. M., Han, D., Silvestrini, B., Cheng, C. Y. Connexin 43 reboots meiosis and reseals blood-testis barrier following toxicant-mediated aspermatogenesis and barrier disruption.

  6. Lithium-bearing fluor-arfvedsonite from Hurricane Mountain, New Hampshire: A crystal-chemical study

    USGS Publications Warehouse

    Hawthorne, F.C.; Oberti, R.; Ottolini, L.; Foord, E.E.

    1996-01-01

    The structures of two crystals of Li-bearing fluor-arfvedsonite (1) (K0.32Na0.68)Na2(Li0.48Fe 2+2.83Mn2+0.10Zn 0.06Fe3+1.46Ti0.07) (Si7.88Al0.12)O22[Fu1.15(OH) 0.85] and (2) (K0.25Na0.75)Na2(Li0.48Fe 2+2.84Mn2+0.11Zn 0.05Fe3+1.45Ti0.07)(Si 7.89Al0.11)O22[F1.35(OH) 0.65] from a granitic pegmatite, Hurricane Mountain, New Hampshire, have been refined to R indices of 1.5(1.6)% based on 1380(1387) reflections measured with MoK?? X-radiation. The unit cell parameters are (1) a 9.838(4), b 17.991(6), c 5.315(2) A??, 103.78(3)??, V 913.7 A??3 and (2) a 9.832(3), b 17.990(7), c 5.316(3) A??, ?? 103.79(3)??, V 913.2 A??3. Site-scattering refinement shows Li to be completely ordered at the M(3) site in these crystals. The amphibole composition is intermediate between fluor-arfvedsonite and fluor-ferro-leakeite with a small component (???10%) of fluor-ferro-ferri-nybo??ite. These amphibole crystals project into miarolitic cavities in a pegmatitic phase of a riebeckite granite. The early-crystallizing amphibole is close to fluor-ferro-leakeite in composition, but becomes progressively depleted in Li and F as crystals project out into miarolitic cavities; the final amphibole to crystallize is a fibrous Li-poor riebeckite. Li plays a significant role in late-stage fractionation involving the crystallization of alkali amphibole in peralkaline granitic environments.

  7. Reconstructing Links between AMOC and Surface Temperature Variability in the North Atlantic

    NASA Astrophysics Data System (ADS)

    Borchert, Leonard; Fischer, Matthias; Müller, Wolfgang; Baehr, Johanna

    2016-04-01

    Kruger, GJ Marshall, M Mauger, HY Mok, Ø Nordli, TF Ross, RM Trigo, XL Wang, SD Woodruff, SJ Worley (2011): The Twentieth Century Reanalysis Project. Q J R Meteorol Soc, 137: 1-28 Müller, W, D Matei, M Bersch, JH Jungclaus, H Haak, K Lohmann, GP Compo, PD Sardeshmukh, J Marotzke (2014): A twentieth-century reanalysis forced ocean model to reconstruct the North Atlantic climate variation during the 1920s. Clim Dyn, 44: 1935-1955

  8. Variability of cyclones over the North Atlantic and Europe since 1871

    NASA Astrophysics Data System (ADS)

    Welker, C.; Martius, O.

    2012-04-01

    . Kruk, A. C. Kruger, G. J. Marshall, M. Maugeri, H. Y. Mok, Ø. Nordli, T. F. Ross, R. M. Trigo, X. L. Wang, S. D. Woodruff, and S. J. Worley, 2011: The Twentieth Century Reanalysis project. Quarterly J. Roy. Meteorol. Soc., 137, 1-28. Wernli, H. and C. Schwierz, 2006: Surface cyclones in the ERA-40 dataset (1958-2001). Part I: Novel identification method and global climatology. J. Atmos. Sci., 63, 2486-2507.

  9. Transition metal coordination polymers based on tetrabromoterephthalic and bis(imidazole) ligands: Syntheses, structures, topological analysis and photoluminescence properties

    NASA Astrophysics Data System (ADS)

    Zhang, Xiaowei; Xing, Peiqi; Geng, Xiujuan; Sun, Daofeng; Xiao, Zhenyu; Wang, Lei

    2015-09-01

    Eight new coordination polymers (CPs), namely, [Zn(1,2-mbix)(tbtpa)]n (1), [Co(1,2-mbix)(tbtpa)]n (2), [CdCl(1,2-mbix)(tbtpa)0.5]n (3), {[Cd(1,2-bix)(tbtpa)]·H2O}n (4), {[Cd0.5(1,2-bix)(tbtpa)0.5]·H2O}n (5), {[Co0.5(1,2-bix)(tbtpa)0.5]·2H2O}n (6), {[Co(1,2-bix)(tbtpa)]·H2O}n (7) and {[Co(1,2-bix)(tbtpa)]·Diox·2H2O}n (8), were synthesized under solvothermal conditions based on mix-ligand strategy (H2tbtpa=tetrabromoterephthalic acid and 1,2-mbix=1,2-bis((2-methyl-1H-imidazol-1-yl)methyl)benzene, 1,2-bix=1,2-bis(imidazol-1-ylmethyl)benzene). All of the CPs have been structurally characterized by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analyses (TGA). X-ray diffraction analyses show that 1 and 2 are isotypics which have 2D highly undulated networks with (4,4)-sql topology with the existence of C-H ⋯Br interactions; for 3, it has a 2D planar network with (4,4)-sql topology with the occurrence of C-H ⋯Cl interactions other than C-H ⋯Br interactions; 4 shows a 3D 2-fold interpenetrated nets with rare 65·8-mok topology which has a self-catention property. As the same case as 1 and 2, 5 and 6 are also isostructural with planar layers with 44-sql topology which further assembled into 3D supramolecular structure through the interdigitated stacking fashion and the C-Br ⋯Cph interactions. As for 7, it has a 2D slightly undulated networks with (4,4)-sql topology which has one dimension channel. While 8 has a 2-fold interpenetrated networks with (3,4)-connect jeb topology with point symbol {63}{65·8}. And their structures can be tuned by conformations of bis(imidazol) ligands and solvent mixture. Besides, the TGA properties for all compounds and the luminescent properties for 1, 3, 4, 5 are discussed in detail.

  10. Kinetic and product studies of Criegee intermediate reactions with halogenated and non-halogenated carboxylic acids and their implications in the troposphere

    NASA Astrophysics Data System (ADS)

    Chhantyal-Pun, Rabi; Rotavera, Brandon; Eskola, Arkke; Taatjes, Craig; Percival, Carl; Shallcross, Dudley; Orr-Ewing, Andrew

    2016-04-01

    Criegee intermediates are important species formed during the ozonolysis of alkenes. Direct measurement and modelling studies have shown that reactions of stabilized Criegee intermediates with species like SO2 and NO2 may have a significant effect in tropospheric chemistry.[1, 2] Reaction rates of Criegee intermediates with simple carboxylic acids like HCOOH and CH3COOH have been shown to be near the collision limit and may be a significant sink for these otherwise stable species in the atmosphere.[3, 4] Results obtained from our time-resolved Cavity Ring-Down Spectroscopy (CRDS) apparatus[5] for reactions of the Criegee intermediates, CH2OO and (CH3)2COO with various halogenated (CF3COOH, CF3CF2COOH, CClF2COOH and CHCl2COOH) and non-halogenated (HCOOH and CH3COOH) carboxylic acids will be presented, together with Structure Activity Relationship (SAR) based on these observations. Structure characterization of the products from these reactions using the Multiplexed PhotoIonization Mass Spectrometry (MPIMS) apparatus[1,3] as well as implications for Secondary Organic Aerosol (SOA) formation, assessed using the global atmospheric model STOCHEM, will also be discussed. Bibliography 1. O. Welz, J. D. Savee, D. L. Osborn, S. S. Vasu, C. J. Percival, D. E. Shallcross and C. A. Taatjes, Science, 2012, 335, 204-207. 2. C. J. Percival, O. Welz, A. J. Eskola, J. D. Savee, D. L. Osborn, D. O. Topping, D. Lowe, S. R. Utembe, A. Bacak, G. McFiggans, M. C. Cooke, P. Xiao, A. T. Archibald, M. E. Jenkin, R. G. Derwent, I. Riipinen, D. W. K. Mok, E. P. F. Lee, J. M. Dyke, C. A. Taatjes and D. E. Shallcross, Faraday Discuss., 2013, 165, 45-73. 3. O. Welz, A. J. Eskola, L. Sheps, B. Rotavera, J. D. Savee, A. M. Scheer, D. L. Osborn, D. Lowe, A. M. Booth, P. Xiao, M. A. H. Khan, C. J. Percival, D. E. Shallcross and C. A. Taatjes, Angew. Chem. Int. Ed., 2014, 53, 4547-4550. 4. M. D. Hurley, M. P. S. Andersen, T. J. Wallington, D. A. Ellis, J. W. Martin and S. A. Mabury, J. Phys. Chem. A

  11. Searching for the Lost Jurassic and Cretaceous Ocean Basins of the Circum-Arctic Linking Plate Models and Seismic Tomography

    NASA Astrophysics Data System (ADS)

    Shephard, G. E.; Müller, R.

    2012-12-01

    pink. Labeled oceanic features in white include ANG Angayucham Ocean AM Amerasia Basin CCR Cache Creek Ocean FAR Farallon Plate IZA Izanagi Plate MOK Mongol-Okhotsk Ocean OMY Oimyakon Ocean SAO South Anuyi Ocean. Selected blue-labeled terranes include AL Alazeya LAU Laurasia NAM North America OM Omolon QS Quesnellia ST Stikinia, WR Wrangellia YTT Yukon-Tanana terrane.

  12. Galbibacter marinus sp. nov., isolated from deep-sea sediment.

    PubMed

    Li, Chongping; Lai, Qiliang; Fu, Yuanyuan; Chen, Shuangxi; Shao, Zongze

    2013-04-01

    A taxonomic study was carried out on a novel bacterium, designated strain ck-I2-15(T), which was isolated from deep-sea sediment collected from the South-west Indian Ocean Ridge. Cells of strain ck-I2-15(T) were Gram-reaction-negative, rod-shaped, non-motile, moderately halophilic and capable of denitrification. Growth was observed with 0-9 % (w/v) NaCl and at temperatures of 10-37 °C. The novel strain was unable to degrade gelatin. The dominant cellular fatty acids were iso-C15 : 0, iso-C17 : 0 3-OH and summed feature 9 (iso-C17 : 1ω9c and/or 10-methyl C16 : 0). The major respiratory quinone was MK6 and the polar lipid profile comprised phosphatidylethanolamine, one unidentified phospholipid, two unidentified aminolipids, one unidentified glycolipid and four other unidentified lipids. The G+C content of the genomic DNA was 38 mol%. 16S rRNA gene sequence comparison indicated that strain ck-I2-15(T) was most closely related to Galbibacter mesophilus Mok-17(T) (92.9 % sequence similarity), followed by 'Joostella atrarenae' M1-2 (92.8 %), Joostella marina En5(T) (92.7 %) and Zhouia amylolytica HN-171(T) (91.6 %). Phylogenetic analyses based on 16S rRNA gene sequences showed that strain ck-I2-15(T) formed a clade with the genus Galbibacter, within the family Flavobacteriaceae. Several phenotypic properties allowed strain ck-I2-15(T) to be distinguished from its closest phylogenetic relatives. On the basis of the phenotypic and phylogenetic data, strain ck-I2-15(T) represents a novel species of the genus Galbibacter, for which the name Galbibacter marinus is proposed. The type strain is ck-I2-15(T) ( = CCTCC AB 209062(T) = LMG 25228(T) = MCCC 1A03044(T)).

  13. Growing plants on atoll soils

    SciTech Connect

    Stone, E L; Migvar, L; Robison, W L

    2000-02-16

    Many years ago people living on atolls depended entirely on foods gathered from the sea and reefs and grown on land. Only a few plants, such as coconut (ni), Pandanus (bob), and arrowroot (mok-mok), could be grown on the lower rainfall atolls, although adequate groundwater conditions also allowed taro (iaraj, kotak, wot) to be cultivated. On higher rainfall atolls, breadfruit (ma) was a major food source, and banana (binana, kepran), lime (laim), and taros (iaraj, kotak, wot) could be grown. The early atoll populations were experts in growing plants that were vital to sustaining their nutrition requirements and to providing materials for thatch, basketry, cordage, canoe construction, flowers, and medicine. They knew which varieties of food plants grew well or poorly on their atolls, how to propagate them, and where on their atoll they grew best. They knew the uses of most native plants and what the various woods were well suited for. Many varieties of Pandanus (bob) and breadfruit (ma) grew well with high rainfall, but only a few produced well on drier atolls. Such information had been passed down through the generations although some of it has been lost in the last century. Today there are new plants and new varieties of existing plants that can be grown on atolls. There are also new materials and information on how to grow both the old and new plants more effectively. However, there are also introduced weeds and pests to control. Today, there is also an acute need to grow more of the useful plants adapted to atolls. Increasing numbers of people living on an atoll without an equal increase in income or food production stretches the available food supplies. Much has been written about the poor conditions for plant growth on atolls. As compared with many places in the world where crops are grown, however, atolls can provide some highly favorable conditions. For instance, the driving force for plant growth is sunlight, and on atolls light is abundant throughout the

  14. Revisiting the 'Buy versus Build' decision for publicly owned utilities in California considering wind and geothermal resources

    SciTech Connect

    Bolinger, Mark; Wiser, Ryan; Golove, William

    2001-10-01

    The last two decades have seen a dramatic increase in the market share of independent, non-utility generators (NUGs) relative to traditional, utility-owned generation assets. Accordingly, the ''buy versus build'' decision facing utilities--i.e., whether a utility should sign a power purchase agreement (PPA) with a NUG, or develop and own the generation capacity itself--has gained prominence in the industry. Specific debates have revolved around the relative advantages of, the types of risk created by, and the regulatory incentives favoring each approach. Very little of this discussion has focused specifically on publicly owned electric utilities, however, perhaps due to the belief that public power's tax-free financing status leaves little space in which NUGs can compete. With few exceptions (Wiser and Kahn 1996), renewable sources of supply have received similarly scant attention in the buy versus build debate. In this report, we revive the ''buy versus build'' debate and apply it to the two sectors of the industry traditionally underrepresented in the discussion: publicly owned utilities and renewable energy. Contrary to historical treatment, this debate is quite relevant to public utilities and renewables because publicly owned utilities are able to take advantage of some renewable energy incentives only in a ''buy'' situation, while others accrue only in a ''build'' situation. In particular, possible economic advantages of public utility ownership include: (1) the tax-free status of publicly owned utilities and the availability of low-cost debt, and (2) the renewable energy production incentive (REPI) available only to publicly owned utilities. Possible economic advantages to entering into a PPA with a NUG include: (1) the availability of federal tax credits and accelerated depreciation schedules for certain forms of NUG-owned renewable energy, and (2) the California state production incentives available to NUGs but not utilities. This report looks at a

  15. Evolution of vacuolar proton pyrophosphatase domains and volutin granules: clues into the early evolutionary origin of the acidocalcisome

    PubMed Central

    2011-01-01

    domains support the early origin of the acidocalcisome organelle. In particular, the universality of volutin granules and presence of a functional V-H+PPase domain in the three superkingdoms of life reveals that the acidocalcisomes may have appeared earlier than the divergence of the superkingdoms. This result is remarkable and highlights the possibility that a high degree of cellular compartmentalization could already have been present in the LUCA. Reviewers This article was reviewed by Anthony Poole, Lakshminarayan Iyer and Daniel Kahn PMID:21974828

  16. Serological study of yaws in Java

    PubMed Central

    Li, Huan-Ying; Soebekti, R.

    1955-01-01

    This report presents the results of serological analyses made by the laboratory of the Treponematoses Control Project, Indonesia, from its establishment in April 1951 until April 1953. All sera were tested quantitatively with the VDRL and Kline slide-tests or the Kahn test, or with all three. A study of the mean reagin titre in untreated yaws cases showed that the percentage of seronegative reactors among clinically positive cases was low. Less seronegativity was observed among females than males. Examination of decrease in mean reagin titre after treatment by clinical group showed maximum to minimum decrease in the following sequence: early contagious, early contagious plus hyperkeratosis, ulcerative plus osteo-articular, ulcerative, hyperkeratosis, and osteo-articular lesions. The decrease tended to be greater in females than males and in patients with high than with low titre; it also varied with the age of the patient. No significant variation in decrease was noted when four different PAM treatment schedules were tested comparatively. The percentage of serological cure and improvement with all schedules was highest in the cases with early lesions, and in the younger age-groups. A study of patients requiring re-treatment at the time of resurvey showed no important difference in mean reagin titre between clinically cured and uncured patients suffering from palmar or plantar hyperkeratosis and ulcerative or osteo-articular lesions. Serological testing of sera from clinically negative household contacts and non-contacts, with or without previous history of yaws, gave the following results: Among the household contacts, the number of seronegative reactors, while not affected by age-distribution, was significantly higher in the history-positive than in the history-negative groups. The percentage of seropositive reactors was in direct proportion to the prevalence of yaws, the seropositivity-rate being high in villages with a yaws incidence of 11%-30%. The report also

  17. Di-, tri-, and tetranuclear nickel(II) complexes with oximato bridges: magnetism and catecholase-like activity of two tetranuclear complexes possessing rhombic topology.

    PubMed

    Das, Lakshmi Kanta; Biswas, Apurba; Kinyon, Jared S; Dalal, Naresh S; Zhou, Haidong; Ghosh, Ashutosh

    2013-10-21

    Oxime-based tridentate Schiff base ligands 3-[2-(diethylamino)ethylimino]butan-2-one oxime (HL(1)) and 3-[3-(dimethylamino)propylimino]butan-2-one oxime (HL(2)) produced the dinuclear complex [Ni2L(1)2](ClO4)2 (1) and trinuclear complex [Ni3(HL(2))3(μ3-O)](ClO4)4·CH3CN (2), respectively, upon reaction with Ni(ClO4)2·6H2O. However, in a slightly alkaline medium, both of the ligands underwent hydrolysis and resulted in tetranuclear complexes [{Ni(deen)(H2O)}2(μ3-OH)2{Ni2(moda)4}](ClO4)2·2CH3CN (3) and [{Ni(dmpn)(CH3CN)2}2(μ3-OH)2{Ni2(moda)4}](ClO4)2·CH3CN (4), where deen = 2-(diethylamino)ethylamine, dmpn = 3-(dimethylamino)-1-propylamine, and modaH = diacetyl monoxime. All four complexes have been structurally characterized. Complex 1 is a centrosymmetric dimer where the square planar nickel(II) atoms are joined solely by the oximato bridges. In complex 2, three square planar nickel atoms form a triangular core through a central oxido (μ3-O) and peripheral oximato bridges. Tetranuclear complexes 3 and 4 consist of four distorted octahedral nickel(II) ions held together in a rhombic chair arrangement by two central μ3-OH and four peripheral oximato bridges. Magnetic susceptibility measurements indicated that dinuclear 1 and trinuclear 2 exhibited diamagnetic behavior, while tetranuclear complexes 3 and 4 were found to have dominant antiferromagnetic intramolecular coupling with concomitant ferromagnetic interactions. Despite its singlet ground state, both 3 and 4 serve as useful examples of Kahn's model for competing spin interactions. High-frequency EPR studies were also attempted, but no signal was detected, likely due to the large energy gap between the ground and first excited state. Complexes 3 and 4 exhibited excellent catecholase-like activity in the aerial oxidation of 3,5-di-tert-butylcatechol to the corresponding o-quinone, whereas 1 and 2 did not show such catalytic activity. Kinetic data analyses of this oxidation reaction in acetonitrile

  18. Scalable Methods for Electronic Excitations and Optical Responses of Nanostructures: Mathematics to Algorithms to Observables

    SciTech Connect

    Carter, Emily A

    2013-02-02

    Kohn-Sham density functional theory (DFT) is a powerful, well-established tool for the study of condensed phase electronic structure. However, there are still a number of situations where its applicability is limited. The basic theme of our research is the development of first principles electronic structure approaches for condensed matter that goes beyond what can currently be done with standard implementations ofKohn-Sham DFT. Our efforts to this end have focused on two classes or' methods. The first addresses the well-lmown inability of DFT to handle strong, many-body electron correlation effects. Our approach is a DFT -based embedding theory, to treat localized features (e.g. impurity, adsorbate, vacancy, etc.) embedded in a periodic, metallic crystal. A description for the embedded region is provided by explicitly correlated, ab initio wave function methods. DFT, as a fo1n1ally ground state theory, does not give a good description of excited states; an additional feature of our approach is the ability to obtain excitations localized in this region. We apply our method to a first-principles study of the adsorption of a single magnetic Co ada tom on non-magnetic Cu( 111 ), a known Kondo system whose behavior is governed by strong electron correlation. The second class of methods that we are developing is an orbital-free density functional theory (OFDFT), which addresses the speed limitations ofKohn-Sham DFT. OFDFT is a powerful, O(N) scaling method for electronic structure calculations. Unlike Kohn-Sham DFT, OFDFT goes back to the original Hohenberg-Kohn idea of directly optimizing an energy functional which is an explicit functional of the density, without invoking an orbital description. This eliminates the need to manipulate orbitals, which leads to O(N{sup 3}) scaling in the Kahn-Sham approach. The speed of OFDFT allows direct electronic structure calculations on large systems on the order of thousands to tens of thousands of atoms, an expensive feat within

  19. Education, population, environment and sustainable development.

    PubMed

    Clarke, J I

    1993-03-01

    Attention is focused worldwide on the overlapping concerns of population growth, environmental change, inequalities in development, and political instability. There is awareness that the earth is one unit of interrelated activity, which can disrupt the single fragile ecosystem. A diverse set of explanations for these interrelationships is offered. Ehrlich and Ehrlich propose that population growth is a driving force that must be reckoned with for a sustainable planet. Both Simon and Kahn and Boserup suggest that human ingenuity is a viable solution for overcoming environmental challenges. The Commoner thesis is that social, economic, technological, and political factors are important intervening factors between the environment and population views. Now the focus is on research. Researching the interrelationships is a complex operation of multiple major, minor, and intervening factors, which may be approached at a local, national, regional, or world scale. Comparisons between scales is difficult. The primary policy question is how does population increase impact locally on the environment. The examination of this policy issue is dependent on human perceptions and values. Who is blameworthy and the bridging of economic gaps between rich and poor nations is now important. The world's population is becoming increasingly more urbanized, which lessons the impact on the environment, but the problem remains of how to adjust to rapid population growth. The goal of sustainable development for the present and future generations is important conceptually. Sustainable development implies that population activities must be integrated with environmental awareness, changes must be made in lifestyles and consumption, land tenure and use must be reformed, and poverty alleviated. The UN Population Fund directs activity toward reordering priorities and emphasizes greater energy efficiency and resource conservation, poverty alleviation, and reduced population growth. Population

  20. Studies on some important characteristics of radioemission from large EAS

    NASA Astrophysics Data System (ADS)

    Baishya, Runima

    The title of the thesis is Studies on some important characteristics of radioemission from large EAS. For this theoretical and experimental study frequencies selected are 50 KHz, 120 KHz, 2 MHz, 9 MHz, 110 MHz and 220 MHz. Experimental works are done at the Cosmic Ray Research Laboratory, Gauhati University, Guwahati, Assam, India, 781014 from 1991 to 1996. The thesis comprises of six chapters. Abstracts of different chapters are given below. Chapter 1. Introduction. In this chapter important characteristics of primary cosmic rays (CR) such as energy spectra, mass composition and origin are given. Longitudinal development of Extensive Air Shower (EAS) in the atmosphere, particle and radiation components of EAS, are also described. The present works aim at the following aspects of radioemission. (1) Characteristics of LF-MF-HF radioemission (i) Frequency spectrum (ii) Variation of fieldstrength with age parameter (s) (iii) Lateral distribution of fieldstrength. (2) Characteristics of VHF radioemission (i) Variation of fieldstrength with height of shower maximum (Hm) at 110 MHz and 220MHz. (ii) Correlation between fieldstrength and age parameter Scas (S cas < 1). (3) Comparison between modified Kahn and Lerche's model and modified Allan's model of radioemission. (i) Frequency spectrum (ii) Lateral distribution of fieldstrength at 110 MHz and 220 MHz. (4) A theoretical model on the basis of transition radiation for LF-MF-HF radioemission. Chapter 2 : Theoretical studies on radioemission (A Review). Theoretical and experimental investigations on radioemission made by different workers are reviewed in this chapter. A brief note on justification of the present work is also presented. Chapter 3: Experimental set-up.. Details of the experimental arrangements, design, fabrication and installation of various units are discussed in this chapter. The study is based on the ground level observations using microprocessor based data acquisition system. Particle detector channels

  1. Gravity Fields Generation In The Universe By The Large Range of Scales Convection Systems In Planets, Stars, Black Holes and Galaxies Based On The "Convection Bang Hypothesis"

    NASA Astrophysics Data System (ADS)

    Gholibeigian, H.; Amirshahkarami, A.; Gholibeigian, K.

    2015-12-01

    In our vision it is believed that the Big Bang was Convection Bang (CB). When CB occurred, a gigantic large-scale forced convection system (LFCS) began to create space-time including gravitons and gluons in more than light speed. Then, simultaneously by a swirling wild wind, created inflation process including many quantum convection loops (QCL) in locations which had more density of temperature and energetic particles like gravitons. QCL including fundamental particles, grew and formed black holes (BHs) as the core of galaxies. LFCSs of heat and mass in planets, stars, BHs and galaxies generate gravity and electromagnetic fields and change the properties of matter and space-time around the systems. Mechanism: Samples: 1- Due to gravity fields of Sun and Moon, Earth's inner core is dislocated toward them and rotates around the Earth's center per day and generates LFCSs, Gholibeigian [AGU, 2012]. 2- Dislocated Sun's core due to gravity fields of planets/ Jupiter, rotates around the Sun's center per 25-35 days and generates LFCSs, Gholibeigian [EGU, 2014]. 3- If a planet/star falls into a BH, what happens? It means, its dislocated core rotates around its center in less than light speed and generates very fast LFCS and friction, while it is rotating/melting around/inward the center of BH. Observable Factors: 1- There is not logical relation between surface gravity fields of planets/Sun and their masses (general relativity); see Planetary Fact Sheet/Ratio to Earth Values-NASA: Earth: mass/gravity =1/1, Jupiter=317.8/2.36, Neptune=17.1/1.12, Saturn=95.2/0.916, Moon=0.0128/0.166, Sun=333000/28. 2- Convective systems in thunderstorms help bring ozone down to Earth [Brian-Kahn]. 3- In 12 surveyed BHs, produced gravity force & magnetic field strength were matched (unique LFCS source) [PhysOrg - June 4, 2014]. Justification: After BB/CB, gravitons were created without any other masses and curvature of space-time (general relativity), but by primary gigantic convection

  2. Blood Lead Concentration and Thyroid Function during Pregnancy: Results from the Yugoslavia Prospective Study of Environmental Lead Exposure

    PubMed Central

    Kahn, Linda G.; Liu, Xinhua; Rajovic, Biljana; Popovac, Dusan; Oberfield, Sharon; Graziano, Joseph H.

    2014-01-01

    Background: Although maternal hypothyroidism increases the risk of adverse neonatal and obstetric outcomes as well as lower IQ in children, the environmental determinants of maternal thyroid dysfunction have yet to be fully explored. Objectives: We aimed to examine associations between mid-pregnancy blood lead (BPb) and concomitant measures of thyroid function among participants in the Yugoslavia Prospective Study of Environmental Lead Exposure. Methods: As part of a population-based prospective study of two towns in Kosovo—one with high levels of environmental lead and one with low—women were recruited during the second trimester of pregnancy, at which time blood samples and questionnaire data were collected. We measured concentrations of BPb, free thyroxine (FT4), thyroid-stimulating hormone (TSH), and thyroid peroxidase antibodies (TPOAb) in archived serum samples. Results: Compared with women from the unexposed town, women from the exposed town had lower mean FT4 (0.91 ± 0.17 vs. 1.03 ± 0.16 ng/dL), higher mean TPOAb (15.45 ± 33.08 vs. 5.12 ± 6.38 IU/mL), and higher mean BPb (20.00 ± 6.99 vs. 5.57 ± 2.01 μg/dL). No differences in TSH levels were found. After adjustment for potential confounders, for each natural log unit increase in BPb, FT4 decreased by 0.074 ng/dL (95% CI: –0.10, –0.046 ng/dL), and the odds ratio for testing positive to TPOAb was 2.41 (95% CI: 1.53, 3.82). We found no association between BPb and TSH. Conclusions: Prolonged lead exposure may contribute to maternal thyroid dysfunction by stimulating autoimmunity to the thyroid gland. Citation: Kahn LG, Liu X, Rajovic B, Popovac D, Oberfield S, Graziano JH, Factor-Litvak P. 2014. Blood lead concentration and thyroid function during pregnancy: results from the Yugoslavia Prospective Study of Environmental Lead Exposure. Environ Health Perspect 122:1134–1140; http://dx.doi.org/10.1289/ehp.1307669 PMID:24866691

  3. Rhodobacter sphaeroides rdxA, a homolog of Rhizobium meliloti fixG, encodes a membrane protein which may bind cytoplasmic [4Fe-4S] clusters.

    PubMed Central

    Neidle, E L; Kaplan, S

    1992-01-01

    In the photosynthetic bacterium Rhodobacter sphaeroides, a chromosomal gene, rdxA, which encodes a 52-kDa protein, was found to be homologous to fixG, the first gene of a Rhizobium meliloti nitrogen fixation operon on the pSym plasmid (D. Kahn, M. David, O. Domergue, M.-L. Daveran, J. Ghai, P. R. Hirsch, and J. Batut, J. Bacteriol. 171:929-939, 1989). The deduced amino acid sequences of RdxA and FixG are 53% identical and 73% similar; sequence analyses suggested that each has five transmembrane helices and a central region resembling bacterial-type ferredoxins. Translational fusion proteins with an alkaline phosphatase reporter group were expressed in both R. sphaeroides and Escherichia coli and were used to assess the membrane topology of RdxA. Its ferredoxinlike sequence, which may bind two [4Fe-4S] centers, was found to be cytoplasmically located. Genetic disruptions showed that rdxA is not essential for nitrogen fixation in R. sphaeroides. Immediately downstream of rdxA, an open reading frame (ORFT2) that encoded a 48-kDa protein was found. This DNA sequence was not homologous to any region of the R. meliloti fixG operon. The N-terminal sequence of the ORFT2 gene product resembled amino acid sequences found in members of the GntR family of regulatory proteins (D. J. Haydon and J. R. Guest, FEMS Microbiol. Lett. 79:291-296, 1991). The rdxA gene was localized to the smaller of two R. sphaeroides chromosomes, upstream of and divergently transcribed from hemT, which encodes one of two 5-aminolevulinate synthase isozymes. The rdxA and hemT genes may share a transcriptional regulatory region. Southern hybridization analysis demonstrated the presence of an rdxA homolog on the R. sphaeroides large chromosome. The functions of this homolog, like those of rdxA, remain to be determined, but roles in oxidation-reduction processes are likely. Images PMID:1400197

  4. Mixing and turbulent mixing in fluids, plasma and materials: summary of works presented at the 3rd International Conference on Turbulent Mixing and Beyond

    NASA Astrophysics Data System (ADS)

    Gauthier, Serge; Keane, Christopher J.; Niemela, Joseph J.; Abarzhi, Snezhana I.

    2013-07-01

    was held in the summer of 2011 at the Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy. The papers are arranged by TMB themes, and within each theme they are ordered alphabetically by the last name of the first author. The collection includes regular research papers, a few research briefs and review papers. The review papers are published as 'Comments' articles in Physica Scripta . Canonical turbulence and turbulent mixing. Six papers are devoted to canonical turbulence and turbulent mixing. Baumert presents a theory of shear-generated turbulence, which is based on a two-fluid concept. Gampert et al investigate the problem of adequate representation of turbulent structures by applying a decomposition of the field of the turbulent kinetic energy into regions of compressive and extensive strain. Paul and Narashima consider the dynamics of a temporal mixing layer using a vortex sheet model. Schaefer et al analyse the joint statistics and conditional mean strain rates of streamline segments in turbulent flows. Sirota and Zybin deepen their discussion of the connection between Lagrangian and Eulerian velocity structure functions in hydrodynamic turbulence. Talbot et al investigate the heterogeneous mixing by considering gases of very nearly equal densities and very different viscosities. Wall-bounded flows. Three papers are dedicated to wall-bounded flows. Mok et al use the Bayesian spectral density approach to identify the dominant free surface fluctuation frequency downstream of an oscillating hydraulic jump. Tejada-Martinez et al employ large eddy numerical simulations to study wind-driven shallow water flows with and without full-depth Langmuir circulation (parallel counter rotating vortices). Wu et al re-evaluate the Karman constant based on a multi-layer analytical theory of Prandtl's mixing length function. Non-equilibrium processes. This theme is represented by two papers. Chasheckhin and Zagumennyi consider non-equilibrium processes

  5. Reassessing the impacts and the atmospheric circulation of the large storms over Portugal

    NASA Astrophysics Data System (ADS)

    Varino, F.; Trigo, R. M.; Zêzere, J. L.

    2012-04-01

    level pressure fields. Additionally a number of other fields were computed and shown in common graphics, namely precipitation rate and CAPE, wind speed and wind divergence at 250 hPa and at 850 hPa geopotential height levels, air temperature at 850 hPa and geopotential height at 500h Pa and finally wind speed barbs and specific moisture content. Compo G. P., Whitaker J.S., Sardeshmukh P.D., Matsui N., Allan R.J., Yin X., Gleason E., J.r., Vose R. S., Rutledge G., Bessemoulin P., Brönnimann S., Brunet M., Crouthamel R.I., Grant A.N., Groisman P. Y., Jones P. D., Kruk M. C., Kruger A.C., Marshall G. J., Maugeri M., Mok H. Y., Nordlki, Ross T.F., Trigo R. M., Wang X. L., Woodruff S. D., Worley S. J. (2011). The Twentieth Century Reanalysis Project. Quarterly Journal of the Royal Meteorological Society, 137(654), 1-28. doi:10.1002/qj.776

  6. Downscaling 20th century flooding events in complex terrain (Switzerland) using the WRF regional climate model

    NASA Astrophysics Data System (ADS)

    Heikkilä, Ulla; Gómez Navarro, Juan Jose; Franke, Jörg; Brönnimann, Stefan; Cattin, Réne

    2016-04-01

    validate the model performance during a larger number of events. Compo, G. P., J. S. Whitaker, P. D. Sardeshmukh, N. Matsui, R. J. Allan, X. Yin,B. E. Gleason, R. S. Vose, G. Rutledge, P. Bessemoulin, S. Bronnimann, M. Brunet, R. I. Crouthamel, A. N. Grant, P. Y. Groisman, P. D. Jones, M. C. Kruk, A. C. Kruger, G. J. Marshall, M. Maugeri, H. Y. Mok, O. Nordli, T. F. Ross, R. M. Trigo, X. L. Wang, S. D. Woodruff, S. J. Worley, 2011: The Twentieth Century Reanalysis Project. Quarterly J. Roy. Met. Soc., 137, 1-28, DOI: 10.1002/qj.776. Hohenegger, C., Walser, A., Langhans, H. and Schär, C., 2008, Cloud-resolving ensemble simulations of the August 2005 Alpine flood, Q. J. R. Meteorol. Soc. 2008, DOI: 10.1002/qj.252 Stucki, P., Rickli, R., Brönnimann, S., Martius, O., Wanner, H., Grebner, D. and Luterbacher, J., 2012, Weather patterns and hydro-climatological precursors of extreme floods in Switzerland since 1868, Meteorologische Zeitschrift, Vol. 21, No. 6, 531-550.

  7. Atmospheric circulation leading to record breaking precipitation and floods in southern Iberia in December 1876

    NASA Astrophysics Data System (ADS)

    Trigo, R. M.; Varino, F.; Vaquero, J.; Valente, M. A.

    2012-04-01

    exception of events in February 2008 in the Lisbon precipitation (Fragoso et al., 2010) and October 1944 in Évora (in both cases for daily precipitation only). Compo G. P., Whitaker J.S., Sardeshmukh P.D., Matsui N., Allan R.J., Yin X., Gleason E., J.r., Vose R. S., Rutledge G., Bessemoulin P., Brönnimann S., Brunet M., Crouthamel R.I., Grant A.N., Groisman P. Y., Jones P. D., Kruk M. C., Kruger A.C., Marshall G. J., Maugeri M., Mok H. Y., Nordlki, Ross T.F., Trigo R. M., Wang X. L., Woodruff S. D., Worley S. J. (2011). The Twentieth Century Reanalysis Project. Quarterly Journal of the Royal Meteorological Society, 137(654), 1-28. doi:10.1002/qj.776 Fragoso, M., Trigo, R. M., Zêzere, J. L., & Valente, M. A. (2010). The exceptional rainfall event in Lisbon on 18 February 2008. Weather, 65(2), 31-35. doi:10.1002/wea.513

  8. [Evaluation of ambulatory antibiotic use in Hungary using drug-specific quality indicators].

    PubMed

    Matuz, Mária; Benkő, Ria; Hajdú, Edit; Viola, Réka; Soós, Gyöngyvér

    2013-06-16

    Bevezetés: A bakteriális rezisztencia visszaszorítására az antibiotikumok átgondolt alkalmazása lehetséges beavatkozási pont. Célkitűzés: A hazai ambuláns antibiotikum-alkalmazás gyakorlatának nemzetközi minőségi indikátorokon keresztül történő bemutatása. Módszer: Az 1996–2010 közötti időszakra vonatkozó nyers, nagykereskedői eladásokon alapuló, ambuláns szisztémás antibiotikum-felhasználási adatokat az Egészségügyi Világszervezet 2010. évi napi terápiás dózisai (defined daily dose – DDD) figyelembevételével DDD/1000 fő/nap egységben adták meg. Az antibiotikum-felhasználás értékelésére a nemzetközileg kidolgozott és validált minőségi indikátorokat alkalmazták. Eredmények: A hazai ambuláns antibiotikum-alkalmazás a vizsgálat során mennyiségileg kiegyenlített (18,0±1,8 DDD/1000 fő/nap) volt, szerkezetében azonban jelentős változások történtek. A széles versus szűk spektrumú béta-laktámok és makrolidek felhasználási aránya többszörösére nőtt (1996: 2,2 vs. 2010: 15,8), a fluorokinolonok felhasználása megháromszorozódott. A vizsgált tíz minőségi indikátor közül Magyarország három indikátor esetében az európai elithez, négy, valamint három esetében a gyengébb, illetve leggyengébb országok közé tartozott. Következtetés: A hazai ambuláns antibiotikum-felhasználás mennyiségileg a skandináv, az összetétel tekintetében a déli országokhoz hasonlít. Orv. Hetil., 2013, 154, 947–956.

  9. The effects of student-level and classroom-level factors on elementary students' science achievement in five countries

    NASA Astrophysics Data System (ADS)

    Kaya, Sibel

    needed. For all the countries investigated, with the exception of Singapore, the between-class variance was much smaller than the within-class variance. Japan had the smallest variation in science achievement among classrooms which indicates the homogeneity across classrooms in Japan. Increasing awareness and knowledge of gender neutral instructional techniques, providing a non-threatening, rich and supportive environment for both genders in classrooms by elementary teachers are to be encouraged. To improve students' self beliefs about science, it is recommended that teachers model science activities and accommodate students' needs and abilities (Bandura, 1997; Britner & Pajares, 2006). Schools and teachers are recommended to develop a successful home-school partnership for improved student learning and positive attitudes toward science (Eccles & Harold, 1996; Epstein & Salinas, 2004). Furthermore, developing a knowledge base for teachers regarding the influences of classroom and school composition is highlighted (Honig, Kahne, & McLaughlin, 2001; Murrel, 2001). At the classroom- and school-level, policy efforts could focus on the distribution of educational resources (Condron & Roscigno, 2003; Goesling, 2003) to compensate for poor family background.

  10. Evidence for smaller extents of the northwestern Greenland Ice Sheet and North Ice Cap during the Holocene

    NASA Astrophysics Data System (ADS)

    Kelly, M. A.; Osterberg, E. C.; Axford, Y.; Bigl, M.; Birkel, S. D.; Corbett, L. B.; Roy, E. P.; Thompson, J. T.; Whitecloud, S.

    2013-12-01

    The Greenland Ice Sheet (GrIS) and local glaciers on Greenland are responding dynamically to warming temperatures with widespread retreat. GRACE satellite data (e.g., Kahn et al., 2010) and the Petermann Glacier calving events document the recent expansion of ice loss into northwestern Greenland. To improve the ability to estimate future ice loss in a warming climate, we are developing records of the response of the northwestern Greenlandic cryosphere to Holocene climatic conditions, with a focus on past warm periods. Our ongoing research includes analyses of glacial geology, sub-fossil vegetation, lake sediment cores, chironomid assemblages and ice cores combined with glaciological modeling. To constrain past ice extents that were as small as, or smaller than, at present, we recovered sub-fossil vegetation exposed at the receding margins of the GrIS and North Ice Cap (NIC) in the Nunatarssuaq region (~76.7°N, 67.4°W) and of the GrIS near Thule (~76.5°N, 68.7°W). We present vegetation types and radiocarbon ages of 30 plant samples collected in August 2012. In the Nunatarssuaq region, five ages of in situ (rooted) vegetation including Polytrichum moss, Saxifraga nathorstii and grasses located <5 m outboard of the GrIS margin are ~120-200 cal yr BP (range of medians of the 2-sigma calibrated age ranges). Nine ages of in situ Polytrichum, Saxifraga oppositafolia and grasses from ~1-5 m inboard of the NIC margin (excavated from beneath ice) range from ~50 to 310 cal yr BP. The growth of these plants occurred when the GrIS and NIC were at least as small as at present and their ages suggest that ice advances occurred in the last 50-120 yrs. In addition to the in situ samples, we collected plants from well-preserved ground material exposed along shear planes in the GrIS margins. In Nunatarssuaq, two Polytrichum mosses rooted in ground material and exposed along a shear plane in the GrIS margin date to 4680 and 4730 cal yr BP. Near Thule, three ages of Salix arctica

  11. Accretion-powered Compact Binaries

    NASA Astrophysics Data System (ADS)

    Mauche, Christopher W.

    2003-12-01

    Preface; The workshop logo; A short history of the CV workshop F. A. Córdova; Part I. Observations: 1. Low mass x-ray binaries A. P. Cowley, P. C. Schmidtke, D. Crampton, J. B. Hutchings, C. A. Haswell, E. L. Robinson, K. D. Horne, H. M. Johnston, S. R. Kulkarni, S. Kitamoto, X. Han, R. M. Hjellming, R. M. Wagner, S. L. Morris, P. Hertz, A. N. Parmar, L. Stella, P. Giommi, P. J. Callanan, T. Naylor, P. A. Charles, C. D. Bailyn, J. N. Imamura, T. Steiman-Cameron, J. Kristian, J. Middleditch, L. Angelini and J. P. Noris; 2. Nonmagnetic cataclysmic variables R. S. Polidan, C. W. Mauche, R. A. Wade, R. H. Kaitchuck, E. M. Schlegel, P. A. Hantzios, R. C. Smith, J. H. Wood, F. Hessman, A. Fiedler, D. H. P. Jones, J. Casares, P. A. Charles, J. van Paradijs, E. Harlaftis, T. Naylor, G. Sonneborn, B. J. M. Hassall, K. Horne, C. A. la Dous, A. W. Shafter, N. A. Hawkins, D. A. H. Buckley, D. J. Sullivan, F. V. Hessman, V. S. Dhillon, T. R. Marsh, J. Singh, S. Seetha, F. Giovannelli, A. Bianchini, E. M. Sion, D. J. Mullan, H. L. Shipman, G. Machin, P. J. Callanan, S. B. Howell, P. Szkody, E. M. Schlegel and R. F. Webbink; 3. Magnetic cataclysmic variables C. Hellier, K. O. Mason, C. W. Mauche, G. S. Miller, J. C. Raymond, F. K. Lamb, J. Patterson, A. J. Norton, M. G. Watson, A. R. King, I. M. McHardy, H. Lehto, J. P. Osborne, E. L. Robinson, A. W. Shafter, S. Balachandran, S. R. Rosen, J. Krautter, W. Buchholz, D. A. H. Buckley, I. R. Tuoly, D. Crampton, B. Warner, R. M. Prestage, B. N. Ashoka, M. Mouchet, J. M. Bonnet-Bidaud, J. M. Hameury, P. Szkody, P. Garnavich, S. Howell, T. Kii, M. Cropper, K. Mason, J. Bailey, D. T. Wickramasinghe, L. Ferrario, K. Beuermann, A. D. Schwope, H.-C. Thomas, S. Jordan, J. Schachter, A. V. Filippenko, S. M. Kahn, F. B. S. Paerels, K. Mukai, M. L. Edgar, S. Larsson, R. F. Jameson, A. R. King, A. Silber, R. Remillard, H. Bradt, M. Ishida, T. Ohashi and G. D. Schmidt; Part II. Accretion Theory: 4. Nonmagnetic W. Kley, F. Geyer, H. Herold, H

  12. Nevadaite, (Cu2+, Al, V3+)6 [Al8 (PO4)8 F8] (OH 2 (H2O)22, a new phosphate mineral species from the Gold Quarry mine, Carlin, Eureka County, Nevada: description and crystal structure

    USGS Publications Warehouse

    Cooper, M.A.; Hawthorne, F.C.; Roberts, Andrew C.; Foord, E.E.; Erd, Richard C.; Evans, H.T.; Jensen, M.C.

    2004-01-01

    21.65. The crystal structure of nevadaite was solved by direct methods and refined to an R index of 4.0% based on 1307 observed reflections collected on a four-circle diffractometer with MoK?? X-radiation. The structure consists of ordered layers of vertex-sharing octahedra and tetrahedra alternating with layers of disordered vertex-sharing and face-sharing octahedra in the b direction. [Al??5] chains of octahedra are decorated by (PO4) tetrahedra that share vertices with octahedra adjacent in the chain. These chains link in the c direction by sharing vertices between octahedra and tetrahedra to form an ordered layer of the form [Al8(PO4)8F8(H2O 8]. In the disordered layer, octahedra containing positionally disordered Cu2+, V3+, Al and ??? (vacancy) share trans faces to form columns that link by sharing octahedron vertices to form ribbons extending in the c direction; the resulting layer has the form (Cu2+2???2V3+, Al ??6 (H2O)12 (OH)2 (H2O)x,, X ??? 2. The layers link in the b direction by sharing vertices between octahedra and tetrahedra. Although decorated chains topologically equivalent to that in nevadaite are common in many oxysalt minerals, its chain is geometrically distinct from those topologically equivalent chains. The M-M linkage along the [M??5] chains in most minerals take place through trans vertices of the octahedra, with one example of linkage through cis vertices; in nevadaite, the M-M linkage involves both trans and cis vertices, as does the chain in slavi??kite. In most of these decorated chains, alternate tetrahedra along the chain occur either in a trans or a cis arrangement. In nevadaite and slavi??kite, the tetrahedra are arranged in both trans and cis arrangements; the arrangements in these two minerals are geometrically distinct, however.

  13. Uncertainties of aerosol retrieval from neglecting non-sphericity of dust aerosols

    NASA Astrophysics Data System (ADS)

    Li, Chi; Xue, Yong; Yang, Leiku; Guang, Jie

    2013-04-01

    Travis, L. D. (1995). Nonsphericity of dust-like aerosols: Implications for aerosol remote sensing and climate modeling, Geophyscal Research Letters, 22, 1077- 1080. Mishchenko, M. I., Travis, L. D., Kahn, R. A., and West, R. A. (1997). Modeling phase functions for dustlike tropospheric aerosols using a shape mixture of randomly oriented polydisperse spheroids, Journal of Geophysical Research, 102, 16831- 16847.

  14. The Value of Renewable Energy as a Hedge Against Fuel Price Risk: Analytic Contributions from Economic and Finance Theory

    SciTech Connect

    Bolinger, Mark A; Wiser, Ryan

    2008-09-15

    gas in the United States over a relatively brief period. Perhaps of most concern is that this dramatic price increase was largely unforeseen. Figure 2 compares the EIA's natural gas wellhead price forecast from each year's Annual Energy Outlook (AEO) going back to 1985 against the average US wellhead price that actually transpired. As shown, our forecasting abilities have proven rather dismal over time, as over-forecasts made in the late 1980's eventually yielded to under-forecasts that have persisted to this day. This historical experience demonstrates that little weight should be placed on any one forecast of future natural gas prices, and that a broad range of future price conditions ought to be considered in planning and investment decisions. Against this backdrop of high, volatile, and unpredictable natural gas prices, increasing the market penetration of renewable generation such as wind, solar, and geothermal power may provide economic benefits to ratepayers by displacing gas-fired generation. These benefits may manifest themselves in several ways. First, the displacement of natural gas-fired generation by increased renewable generation reduces ratepayer exposure to natural gas price risk--i.e., the risk that future gas prices (and by extension future electricity prices) may end up markedly different than expected. Second, this displacement reduces demand for natural gas among gas-fired generators, which, all else equal, will put downward pressure on natural gas prices. Lower natural gas prices in turn benefit both electric ratepayers and other end-users of natural gas. Using analytic approaches that build upon, yet differ from, the past work of others, including Awerbuch (1993, 1994, 2003), Kahn and Stoft (1993), and Humphreys and McClain (1998), this chapter explores each of these two potential 'hedging' benefits of renewable electricity. Though we do not seek to judge whether these two specific benefits outweigh any incremental cost of renewable energy

  15. Preface: Proceedings of the Colloidal Dispersions in External Fields II Conference (Bonn-Bad Godesberg, 31 March 2 April 2008)

    NASA Astrophysics Data System (ADS)

    Löwen, H.

    2008-10-01

    (Edinburgh), D Y H Chui (Mainz), D Deb (Graz), C Dellago (Vienna), J Dhont (Jülich), P Dillmann (Konstanz), G Dominguez (Leipzig), M Duits (Enschede), B Dünweg (Mainz), F Ebert (Konstanz), S Egelhaaf (Düsseldorf), E Eggen (Utrecht), R Eichhorn (Bielefeld), E Eiser (Cambridge), H B Eral (Enschede), A Erbe (Konstanz), L Filion (Utrecht), G Foffi (Lausanne), J Fornleitner (Vienna), K Franzrahe (Konstanz), D Frenkel (Cambridge), M Fuchs (Konstanz), G Fytas (Heraklion), P Garstecki (Warsaw), I Gazuz (Konstanz), N Geerts (Amsterdam), G Gompper (Jülich), E Gonzalez-Tovar (San Luis Potosi), I Götze (Jülich), S Grandner (Berlin), L Gránásy (London), C Gutsche (Leipzig), D Hajnal (Mainz), R Hanes (Düsseldorf), A Härtel (Düsseldorf), P Henseler (Konstanz), C Hertlein (Stuttgart), C Holm (Mainz), J Hoogenboom (Barcelona), P Hopkins (Bristol), J Horbach (Cologne), C-C Huang (Jülich), K Huang (Göttingen), S Huißmann (Düsseldorf), M Humar (Ljubljana), S Iacopini (Mainz), A Imhof (Utrecht), A Ivlev (Garching), K Jacobs (Saarbrücken), J Jakobi (Hannover), O Jansen (Düsseldorf), M Jenkins (Düsseldorf), J Jordanovic (Berlin), S Jungblut (Mainz), M Kahn (Vienna), T Kalwarczyk (Warsaw), K Kegler (Leipzig), P Keim (Konstanz), Z Keqin (Singapore), U F Keyser (Leipzig), T Köller (Mainz), K Kremer (Mainz), M Krüger (Konstanz), A Kuijk (Utrecht), P Lang (Jülich), M Laurati (Düsseldorf), W Lechner (Vienna), H Lehle (Stuttgart), P Leiderer (Konstanz), H Lekkerkerker (Utrecht), P Lettinga (Jülich), A Libal (San Mart), B Lonetti (Jülich), N J Lorenz (Mainz), H Löwen (Düsseldorf), H Maleki (Mainz), J-G Malherbe (Paris), M Marechal (Utrecht), G Maret (Konstanz), C Mayer (Rome), S Mazoyer (Konstanz), M McPhie (Jülich), M Medina-Noyola (San Luis Potosi), A Melzer (Greifswald), A Menéndez-Manjón (Hannover), R Messina (Düsseldorf), H Michiel (Utrecht), P Mishra (Düsseldorf), J Mixteco (Guanajuato), B Moser (Düsseldorf), G Nägele (Jülich), R R Netz (Munich), P Nielaba (Konstanz

  16. STUDIES IN THE SEROLOGY OF SYPHILIS : III. EXPLANATION OF THE FORTIFYING EFFECT OF CHOLESTERIN UPON THE ANTIGEN AS USED IN THE WASSERMANN AND FLOCCULATION TESTS.

    PubMed

    Eagle, H

    1930-10-31

    :1, when there is not sufficient antigen to act as an efficient protective colloid. Cholesterin therefore causes a coarsened dispersion of antigen by forming a relatively large nucleus upon which antigen is adsorbed. As shown in the text, the larger the antigen particle the greater is its avidity for reagin per unit surface or mass. Thus, the coarse sol formed by dropping water-into-antigen is about twice as efficient as a finely dispersed antigen-into-water sol of the same concentration. The coarsened dispersion caused by cholesterin completely explains the greater sensitivity of the cholesterinized antigen in complement fixation. The same factor obtains in the flocculation reactions. In addition, the coarsened dispersion acts as a preliminary quasi-aggregation, facilitating by just so much the subsequent formation of visible clumps (or sedimenting aggregates) upon the addition of syphilitic serum; moreover, there is less surface in a coarse sol, with more reagin per unit surface, and correspondingly more efficient flocculation. The foregoing would be of purely academic interest were it not for the following considerations. From several points of view cholesterin is unsatisfactory as a sensitizer for antigen. Its solubility in alcohol is small. Even the 0.6 per cent concentration used in the Kahn test is difficult to keep in solution. Yet, as our experiments show, its sensitizing action increases indefinitely with its concentration. If it were sufficiently soluble, even 3 per cent could be used to advantage, increasing the sensitivity of 1(1/2) per cent antigen for complement fixation some 200 to 400 per cent, instead of about 50 per cent, as does 0.2 per cent cholesterin. Since, as we have shown, the sensitizing action of cholesterin upon antigen is due solely to the coarse dispersion it causes, and since it is quite inert during the actual combination of the lipoid particles with reagin, it can be replaced by any substance with similar physical properties. The problem

  17. PERSPECTIVE: Waorani at the head of the table: towards inclusive conservation in Yasuní

    NASA Astrophysics Data System (ADS)

    McSweeney, Kendra; Pearson, Zoe

    2009-09-01

    the difference between them, let alone find the time and breathing room to help develop their own collective initiatives and political positions free from outsider influence. Building on the points above, a third imperative is to be patient. Effective conservation alliances evolve slowly and painstakingly. Flashy, short-term conservation successes are too often eroded in the long term by inattention to the priorities of (indigenous) residents who will collectively endure long beyond the lifespan of any single organization, budget cycle, or state entity. In Yasuní, this means that effective conservation initiatives must be built, from their inception forward, on meaningful dialogue from a range of Waorani to capture the breadth of their priorities. Some conservation groups are making great gains in this direction, but it is important to remember that there is a difference between programmatic inclusion of Waorani (i.e., ensuring their input into a project) and the programmatic prioritization of Waorani's autonomously-defined goals (see also Chapin 2004). The latter is not easy. Collaborators will find their alliances strained, frustrating, contentious, 'political', and probably more trouble than they appear to be worth. But the task will be made more manageable if outsiders accept their actions as the power plays that they are, expect such challenges, budget money and time for them, and enlist personnel trained to facilitate inter-cultural dialogue so that Waorani desires are properly understood. Any other approaches risk long-term alienation of the only stakeholder with a demonstrated multi-generational commitment to Yasuní. References Chapin M 2004 A challenge to conservationists World Watch (Nov/Dec) 17-31 Finer M, Vijay V, Ponce F, Jenkins C N and Kahn T R 2009 Ecuador's Yasuní Biosphere Reserve: a brief modern history and conservation challenges Environ. Res. Lett. 4 034005 Hale C R 2001 What is activist research? Items & Issues 2(1-2) 13-15 High C 2006

  18. Mixing and turbulent mixing in fluids, plasma and materials: summary of works presented at the 3rd International Conference on Turbulent Mixing and Beyond

    NASA Astrophysics Data System (ADS)

    Gauthier, Serge; Keane, Christopher J.; Niemela, Joseph J.; Abarzhi, Snezhana I.

    2013-07-01

    was held in the summer of 2011 at the Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy. The papers are arranged by TMB themes, and within each theme they are ordered alphabetically by the last name of the first author. The collection includes regular research papers, a few research briefs and review papers. The review papers are published as 'Comments' articles in Physica Scripta . Canonical turbulence and turbulent mixing. Six papers are devoted to canonical turbulence and turbulent mixing. Baumert presents a theory of shear-generated turbulence, which is based on a two-fluid concept. Gampert et al investigate the problem of adequate representation of turbulent structures by applying a decomposition of the field of the turbulent kinetic energy into regions of compressive and extensive strain. Paul and Narashima consider the dynamics of a temporal mixing layer using a vortex sheet model. Schaefer et al analyse the joint statistics and conditional mean strain rates of streamline segments in turbulent flows. Sirota and Zybin deepen their discussion of the connection between Lagrangian and Eulerian velocity structure functions in hydrodynamic turbulence. Talbot et al investigate the heterogeneous mixing by considering gases of very nearly equal densities and very different viscosities. Wall-bounded flows. Three papers are dedicated to wall-bounded flows. Mok et al use the Bayesian spectral density approach to identify the dominant free surface fluctuation frequency downstream of an oscillating hydraulic jump. Tejada-Martinez et al employ large eddy numerical simulations to study wind-driven shallow water flows with and without full-depth Langmuir circulation (parallel counter rotating vortices). Wu et al re-evaluate the Karman constant based on a multi-layer analytical theory of Prandtl's mixing length function. Non-equilibrium processes. This theme is represented by two papers. Chasheckhin and Zagumennyi consider non-equilibrium processes