Feasibility study of a 200 watt per kilogram lightweight solar array system

Progress in an investigation of the feasibility of designing a lightweight solar array with a power-to-weight ratio of 200 watts per kilogram is described. This solar array will produce 10,000 watts of electrical power at 1 A.U. at its beginning of life (BOL), and degrade less than 20% over a three year period in interplanetary flight. A review of existing lightweight solar array system concepts is presented along with discussion pertaining to their applicable technology as it relates to a 200 watt/kilogram array. Also presented is a discussion of the candidate development solar cells being considered, and various deployable boom concepts under investigation

Evaluating the Diversity of Emergency Medicine Foundation (EMF) Grant Recipients in the Last Decade

On behalf of the ACEP Research CommitteeIntroduction: To study diversity of researchers and barriers to success among Emergency Medicine Foundation (EMF) grant recipients in the last 10 years.Methods: EMF grant awardees were approached to complete a brief survey, which included demographics, queries related to contributions to the literature, success in obtaining grants, and any perceived barriers they encountered.Results: Of the 342 researchers contacted by email, a total of 147 completed the survey for a response rate of 43%. The respondents were predominately mid to late career white-male-heterosexual-Christian with an average age of 44 years (range 25-69 years of age). With regards to training and education, the majority of respondents (50%) were either Associate or Professor clinical rank (8% instructor/resident/fellow and 31% Assistant). Sixty-two percent of the respondents reported perceived barriers to career advancement since completion of residency. The largest perceived barrier to success was medical specialty (26%), followed by gender (21%) and age (16%).Conclusion: Our survey of EMF grant recipients in the last 10 years shows a considerable lack of diversity. The most commonly perceived barriers to career advancement by this cohort were medical specialty, gender, and age. An opportunity exists for further definition of barriers and development of mechanisms to overcome them, with a goal of increased success for those that are underrepresented. 

Solar array conceptual design for the Halley's Comet ion drive mission, phase 2

Conceptual design studies were performed directed toward a high power, ultralightweight solar array, compatible with the requirements for the Halley's Comet Ion Drive Mission. A planar, rollup array design concept capable of producing 120 kW at 1 AU and 6 kW at 4.5 AU, and a concentrator, rollup array design concept capable of producing 60 kW at 1 AU and 15.5 kW at 4.5 AU evolved. Both arrays make maximum use of thin film, lightweight technology. The Halley's Comet spacecraft and mission requirements developed from preliminary definition to a more finalized and mature design. As solar array requirements were updated, conceptual design iterations were necessary to keep pace with the rapidly changing program objectives and goals. The Halley's Comet Mission program status and design approaches were reviewed and more realistic power requirements at 4.5 AU for the ion engines were established at the 12 to 16 kW range. This higher power necessitated a change from the planar array design to a concentrator array design in order to remain within suitable cost and weight objectives

Spatial and Temporal Habitat Use of an Asian Elephant in Sumatra

Increasingly, habitat fragmentation caused by agricultural and human development has forced Sumatran elephants into relatively small areas, but there is little information on how elephants use these areas and thus, how habitats can be managed to sustain elephants in the future. Using a Global Positioning System (GPS) collar and a land cover map developed from TM imagery, we identified the habitats used by a wild adult female elephant (Elephas maximus sumatranus) in the Seblat Elephant Conservation Center, Bengkulu Province, Sumatra during 2007–2008. The marked elephant (and presumably her 40–60 herd mates) used a home range that contained more than expected medium canopy and open canopy land cover. Further, within the home range, closed canopy forests were used more during the day than at night. When elephants were in closed canopy forests they were most often near the forest edge vs. in the forest interior. Effective elephant conservation strategies in Sumatra need to focus on forest restoration of cleared areas and providing a forest matrix that includes various canopy types

Finding Identity through Irish Music in the Appalachian Mountains

The Appalachian Mountains are filled with remnants of Scot-Irish heritage. The music found in this region includes bluegrass, Old-time, and country music, all created from the blending of Scottish and Irish traditional music with other ethnic sounds. Despite these music variations, traditional Irish music has remained consistent in its original form in the mountain region. This concept is supported by the popularity of two key events occurring in both the northern and southern sections of the Appalachians. Through fieldwork and personal interviews, the rationales of those who participated were discovered. The research brought to light three people sub-groups revealing the three ways they identified with the Irish culture through traditional Irish music and dance. Each event attracted a different primary sub-group which aligned with the mission and objectives of the individual host organizations. Participants found a way to acquire Irish identity in some form. Although specific motivations of cultural identification were unique to the individual, ultimately the participants attended the events to establish, develop, or sustain connection to the culture. The process of learning and making music together facilitated the accomplishment of that goal

An investigation of the adhesive bonding of Teflon solar cell covers

The concept of introducing organic agents into silicone resins to stabilize these materials against the ravages of ultraviolet radiation is presented. A screening of coating materials, cover materials and ultraviolet screening agents is described. Fabrication processes were developed for the application of thin 25 micrometer coatings to Teflon. Temperature shock and temperature-humidity tests were conducted

Pengaruh Perbandingan Sari Ubi Jalar Ungu (Ipomoea batatas var. Ayamurakasi) dan Sari Dami Nangka (Artocarpus heterophyllus) terhadap Karakteristik Mutu Sirup Dami Nangka

Penelitian ini bertujuan untuk mengetahui pengaruh perbandingan sari ubi jalar ungu dan sari dami nangka terhadap karakteristik mutu sirup dami nangka secara kimia dan fisika, dan untuk mengetahui perbandingan sari ubi jalar ungu degan sari dami nangka yang tepat. Penelitian ini menggunakan Rancangan Acak Lengkap dengan 5 perlakuan dan 3 kali ulangan. Perlakuan yang digunakan adalah perbandingan sari ubi jalar ungu dengan sari dami nangka sebanyak A (3% : 97%), perlakuan B (6% : 94%), perlakuan C (9% : 91%), perlakuan D (12% : 88%), dan perlakuan E (15% : 85%). Data yang diperoleh dianalisa secara statistika dengan ANOVA (Analysis of Varience) dan dilanjutkan dengan uji Duncan’s New Multiple Range Test (DNMRT) pada taraf nyata 5%. Hasil penelitian menunjukkan bahwa perlakuan A, B, C, D, dan E berpengaruh nyata terhadap analisis warna, nilai pH, aktivitas antioksidan, kadar antosianin, total asam, total padatan terlarut dan berpengaruh tidak nyata terhadap total gula dan viskositas sirup dami nangka. Perlakuan terbaik menurut uji organoleptik yang dilakukan terdapat pada perlakuan E (Perbandingan sari ubi jalar ungu 15% dan sari dami nangka 85%) dengan nilai rata rata yaitu warna (4,6%), aroma (4,0%) dan rasa (4,2%). Kata kunci: sirup dami nangka, ubi jalar ungu, sirup, dami nangk

Lightbeam

Review of Lightbeam, Reviewed June 2015 by Heather Rayl, Emerging Technology Librarian Indiana State University Library [email protected]

The Wolsey Manuscripts

Review of The Wolsey Manuscripts, Reviewed August 2017 by Heather Rayl, Director of Technology and Special Collections Vigo County Public Library [email protected]