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Proceedings from the Ice Hockey Summit III: Action on Concussion
Aynsley M Smith(Aynsley M Smith ),Patrick A Alford(Patrick A Alford ),Mark Aubry(Mark Aubry ),Brian Benson(Brian Benson ),Amanda Black(Amanda Black ),Alison Brooks(Alison Brooks ),Charles Burke(Charle 사피엔시아 2019 Exercise Medicine Vol.3 No.-
Objectives: The Ice Hockey Summit III provided updated scientific evidence on concussions in hockey to inform these five objectives: (1) describe sport related concussion (SRC) epidemiology, (2) classify prevention strategies, (3) define objective, diagnostic tests, (4) identify treatment and (5) integrate science and clinical care into prioritized action plans and policy. Methods: Our action plan evolved from 40 scientific presentations. The 155 attendees (physicians, athletic trainers, physical therapists, nurses, neuropsychologists, scientists, engineers, coaches and officials) voted to prioritize these action items in the final Summit session. Results: (1) establish a national and international hockey data base for SRCs at all levels; (2) eliminate body checking in Bantam youth hockey games; (3) expand a behavior modification program (Fair Play) to all youth hockey levels; (4) enforce game ejection penalties for fighting in Junior A and professional hockey leagues; (5) establish objective tests to diagnose concussion at point of care (POC); and (6) mandate baseline testing to improve concussion diagnosis for all age groups. Conclusions: Expedient implementation of the Summit III prioritized action items is necessary to reduce the risk, severity and consequences of concussion in the sport of ice hockey.
Microwave Dielectric Properties of Bi<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> Composite Ceramics
Axelsson, Anna-karin,Sebastian, Maladil,McN Alford, Neil The Korean Ceramic Society 2003 한국세라믹학회지 Vol.40 No.4
B $i_2$ $O_3$-Ti $O_2$ composite dielectric ceramics have been prepared by a conventional solid state ceramic route. The composite ceramics were prepared with starting materials of different origin and the microwave dielectric properties were investigated. The sintered ceramics were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray microanalysis, Raman and microwave methods. Structural and microstructural analyses identified two separate phases: Ti $O_2$(rutile) and B $i_2$ $Ti_4$0$_{11}$. The separate grains of titania and bismuth titanate were distributed uniformly in the ceramic matrix. The composition 0.88Ti $O_2$-0.12B $i_2$ $Ti_4$ $O_{11}$ was found to have a Q$\times$f of 9300 GHz (measured at a frequency of 3.9 GHz), a temperature coefficient of frequency, $\tau$$_{cf}$ near zero and a high relative permittivity, $\varepsilon$r of 83. The microwave dielectric properties were measured down to 20$^{\circ}$K K. The quality factor increased on cooling the ceramic samples.les.
Scaling properties at freeze-out in relativistic heavy-ion collisions
Aggarwal, M. M.,Ahammed, Z.,Alakhverdyants, A. V.,Alekseev, I.,Alford, J.,Anderson, B. D.,Anson, C. D.,Arkhipkin, D.,Averichev, G. S.,Balewski, J.,Barnby, L. S.,Beavis, D. R.,Bellwied, R.,Betancourt, American Physical Society 2011 PHYSICAL REVIEW C - Vol.83 No.3
Observation of the antimatter helium-4 nucleus
Agakishiev, H.,Aggarwal, M. M.,Ahammed, Z.,Alakhverdyants, A. V.,Alekseev, I.,Alford, J.,Anderson, B. D.,Anson, C. D.,Arkhipkin, D.,Averichev, G. S.,Balewski, J.,Beavis, D. R.,Behera, N. K.,Bellwied, Nature Publishing Group, a division of Macmillan P 2011 Nature Vol.473 No.7347
High-energy nuclear collisions create an energy density similar to that of the Universe microseconds after the Big Bang; in both cases, matter and antimatter are formed with comparable abundance. However, the relatively short-lived expansion in nuclear collisions allows antimatter to decouple quickly from matter, and avoid annihilation. Thus, a high-energy accelerator of heavy nuclei provides an efficient means of producing and studying antimatter. The antimatter helium-4 nucleus (), also known as the anti-慣 (), consists of two antiprotons and two antineutrons (baryon number B = ??4). It has not been observed previously, although the 慣-particle was identified a century ago by Rutherford and is present in cosmic radiation at the ten per cent level. Antimatter nuclei with B??<????1 have been observed only as rare products of interactions at particle accelerators, where the rate of antinucleus production in high-energy collisions decreases by a factor of about 1,000 with each additional antinucleon. Here we report the observation of , the heaviest observed antinucleus to date. In total, 18 counts were detected at the STAR experiment at the Relativistic Heavy Ion Collider (RHIC; ref. 6) in 10<SUP>9</SUP> recorded gold-on-gold (Au+Au) collisions at centre-of-mass energies of 200??GeV and 62??GeV per nucleon??nucleon pair. The yield is consistent with expectations from thermodynamic and coalescent nucleosynthesis models, providing an indication of the production rate of even heavier antimatter nuclei and a benchmark for possible future observations of in cosmic radiation.
조경익,구재본,추혜용,Cho, K.I.,Koo, J.B.,Chu, H.Y.,Alford, T.L. 한국전자통신연구원 2013 전자통신동향분석 Vol.28 No.5
대면적 태양전지와 디스플레이용 투명전극으로 지금까지는 투명전도성산화물(TCO: Transparent Conductive Oxide)이 일반적으로 사용되어 왔지만, 성능이 향상된 새로운 소자가 등장함에 따라 현재보다 우수한 광학 특성을 가지면서 낮은 전기저항을 갖는 새로운 투명전극을 개발하기 위한 관심이 집중되고 있다. 다양한 종류의 차세대 투명전극 기술 중 현재 응용 가능성이 가장 높은 투명합성전극(TCE: Transparent Composite Electrode, TCO/금속/TCO 구조) 기술은 단일 층 TCO를 사용하는 것보다 우수한 전기 광학적 특성을 보여주고, 더구나 플라스틱 기판 위에 저온에서도 공정이 가능하기 때문에 새로운 투명전극 기술로 부상하게 되었다. 본고에서는 투명합성전극 기술에 대해 소재의 선택, 전기 광학적 특성, 기계적 열적 습도 안정성과 소자 응용 관련 주요 현황에 대해 살펴보고자 한다.