Optimum doping achieves high quantum yields in GaAs photoemitters

Experimental data indicate that optimum doping exists. Measured quantum yield curves indicate optimum overall response is obtained in GaAs emitters with doping in high 10 to the 18th power per cu cm range. Doping for optimum response is not necessarily in this range

World War II: On the Home Front - M. Francis Coulson Interview

Americans love anniversaries. The fiftieth anniversary of the end of the Second World War has afforded citizens an opportunity to remember with pride the great men and events of a war that saved the world from totalitarian tyranny. Happily, memories of World War II have not been restricted to recalling battlefield heroics or diplomatic intrigues. Across the United States, public libraries and local historical societies have commemorated the Home Front during the war years with exhibits that recapture the texture of life on farms, factories, in classrooms, and at home during what Studs Terkel has labeled the Good War. These exhibits remind us what we know instinctively: that experiencing wartime is not simply the province of men and women in uniform. Anyone over the age of fifty-five has some vivid memories of America at war from 1941-1945. Millions of Americans who never put on a military uniform made their own contributions to the war effort. Their contributions mattered, and so do their memories. At Gettysburg College, in recognition of this basic truth, students in Historical Methods courses have for several years been interviewing senior citizens about their wartime memories. Perhaps two dozen or more of these interviews were conducted with Adams countians, across a broad spectrum of experience. Among the interview subjects were farmers, housewives, nurses, schoolteachers, businessmen, college students, and seminarians. One subject, a conscientious objector, provided a most distinctive perspective on a war that mythology suggests was supported fervently by all Americans. In fact, most Americans did enthusiastically support the war effort, as testimony from Adams Countians suggests. In the following interview, conducted by Gettysburg College student Jenny Sonnenberg with Francis Coulson, readers will learn some of the ways that average citizens were affected by the war and contributed to a remarkable home-front effort to support the boys overseas. A teacher in a one-room school in the county for much of the war, Mr. Coulson recounts his experiences with rationing and civil defense, and offers a persuasive picture of a populace that was willing to make sacrifices in order to help American soldiers bring the war to a quicker end. It is an important story, not because Francis Coulson\u27s experiences were spectacular, much less unique, but rather, because they were commonplace. As the interview itself suggests, the war years marked a time when Americans had much less materially than they would in the boom times following the war. It was still a time of simple habits and old fashioned values. In bringing to life the experiences of these years and the habits of everyday life, oral histories like those Ms. Sonnenberg conducted with Francis Coulson make an important contribution to local history and can help spark other conversations with individuals who had their own distinctive experiences during the war years. What follows is an edited transcription of a taped interview that is available in its entirety at the Adams County Historical Society Library. [excerpt

Advanced infrared photomultiplier

Photocathode for the 8500 angstrom through 9000 angstrom range, improving efficiency by an order of magnitude, is achieved with a gallium arsenide cesium oxide photocathode. Protection of the GaAs surface from contamination during bake-out is another important function

Experiments, Surveys and the Use of Representative Samples as Reference Data

During the last two decades, laboratory experiments have come into increasing prominence and constitute a popular method of research to examine behavioral outcomes and social preferences. However, it has been debated whether results from these experiments can be extrapolated to the real world and whether, for example, sample selection into the experiment might constitute a major shortcoming of this methodology. This note discusses potential benefits of combining experimental methods and representative datasets as a means to overcome some of the limitations of lab experiments. We also outline how large representative surveys can serve as reference data for researchers collectingexperiments, survey, representativity

An Assessment of University Infrastructure Impact on the Safety of Individuals with Physical Disabilities at the University of Texas at Austin - Poster

Personal safety at the University of Texas is an increasingly popular topic of conversation between students, staff, faculty, and University administration. Concerns stemming from the recently passed “Campus Carry” legislation and the on-campus murder of an undergraduate student that occurred in the spring of 2016 spark debate over the utility of various safety resources currently available on-campus. However, the accessibility of said resources is hardly addressed. Per the 2010 U.S. Census, over 15% of U.S. adults identify as having any physical functioning difficulty. As the University of Texas campus hosts tens of thousands of adults each day, this thesis was conducted to address the flowing overarching question: How does the physical infrastructure of current safety resources on the University of Texas at Austin campus impact the safety of students, faculty, and staff with physical disabilities? To address this question, a survey was developed based on 2 semi-structured interviews gauging safety concerns with individuals from the disabled community, news articles documenting the use of campus safety resources, and University published documents. The survey underwent content review by 4 subject matter experts in areas such as civil engineering, campus diversity and community engagement, and the Americans with Disabilities act of 1990. Social media platforms such as Facebook and email list serves for various groups at the University of Texas were used to distribute the survey. It is expected that the results of the survey will indicate the perceptions of current and former students, faculty, and staff will underestimate the prevalence and use and overestimate the accessibility of certain safety resources mentioned in the survey. This poster is a summarized presentation of the findings from the survey.Civil, Architectural, and Environmental Engineerin

HIV testing intervention development among men who have sex with men in the developed world

HIV testing is a ‘gateway’ technology, enabling access to treatment and HIV prevention. Biomedical approaches to prevention, such as pre-exposure prophylaxis and treatment as prevention, require accurate and regular HIV test results. HIV testing also represents a powerful ‘teachable moment’ for behavioural prevention. An increasing range of HIV tests and the emergence of self-managed diagnostic technologies (e.g. self-testing) means there is now considerable diversification of when, where and how results are available to those who test. These changes have profound implications for intervention development and, indeed, health service redesign. This paper highlights the need for better ways of conceptualising testing in order to capitalise on the health benefits that diverse HIV testing interventions will bring. A multidimensional framework is proposed to capture ongoing developments in HIV testing among men who have sex with men and focus on the intersection of: (1) the growing variety of HIV testing technologies and the associated diversification of their pathways into care; (2) psychosocial insights into the behavioural domain of HIV testing; and (3) better appreciation of population factors associated with heterogeneity and concomitant inequities. By considering these three aspects of HIV testing in parallel, it is possible to identify gaps, limitations and opportunities in future HIV testing-related interventions. Moreover, it is possible to explore and map how diverse interventions may work together having additive effects. Only a holistic and dynamic framework that captures the increasing complexity of HIV testing is fit for purpose to deliver the maximum public health benefit of HIV testing

Isolation, characterisation and expression patterns of a RAD51 ortholog from Pleurotus ostreatus

AB: Using degenerated primers for conserved regions of RecA homologs we have isolated a gene from Pleurotus ostreatus that shows characteristic features of RAD51 homologs. The encoded amino acid sequence of P. ostreatus RAD51 (PoRAD51) shows greatest sequence similarities with RAD51 from Coprinus cinereus (89% identity). Furthermore the genomic organisation of PoRAD51 is almost identical to that of RAD51 from C. cinereus. Northern analysis shows that the expression of PoRAD51 is found in vegetative mycelium, and fruit body tissue, and that it is expressed at elevated levels in lamellae/basidia and following DNA damage. A sporulation deficient mutant strain of P. ostreatus (ATTC 58937) showed expression patterns of the RAD51 gene that are similar those of the normal sporulating strain