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简介:Datingbackto1933,SCNU'sPhysicsdisciplinewasselectedforthenationalproject"World-ClassDisciplineDevelopment"bytheMinistryofEducationin2017.CurrentlytheSchoolacceptsanaverageof1800full-timeundergraduatesand500postgraduateresearchstudents,producingapproximately20000graduatessinceitsfoundation.
简介:最近,放射压力加速(RPA)被建议了并且广泛地学习了,它证明那循环地极化了(CP)激光脉搏能在phase-stable-acceleration(PSA)加速单音精力充沛的离子捆从ultrathin陪衬的方法。自我组织的质子横梁能稳定地在10点在和一个平面目标的CP激光的相互作用被加速到GeV,这被发现<啜class=“a-plus-plus”>22W/cm<啜class=“a-plus-plus”>2。称为紧缩的激光血浆质子加速器(CLAPA)的一个工程最近被大多数在中国同意。激光的一个原型驾驶质子加速器(1~15MeV/1Hz)将基于PSA机制和血浆透镜在下一五年里在北京大学被造。它以后将为惯性的范围熔化为象癌症治疗,血浆成像和快点火那样的应用被升级到200兆电子伏。
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简介:AbstractBackground:Human immunodeficiency virus (HIV) prevalence among student men who have sex with men (MSM) in college is more than 5.0% and keeps on increasing in China. This study aims to clarify the proportion of HIV recent infection, its propeller and the source among college student MSM.Methods:We conducted a multicenter cross-sectional study in seven major Chinese cities during 2012-2013. HIV recent infections (≤168 days) and incidence was measured and estimated by BED HIV-1 capture enzyme immunoassay (BED-CEIA) testing strategy. HIV-related behaviors and transmitted drug resistance (TDR) were investigated and compared between the college student MSM, < 25-year-old non-student youth MSM (NSYM), and ≥25-year-old non-student non-youth MSM (NSNYM), using structured survey, and analyses of drug resistance.Results:Overall, 4496 (4496/4526, 99.3%) were eligible for enrollment, comprising 565 college student MSM, 1094 NSYM, and 2837 NSNYM. The proportion of HIV recent infection were 70.3% (26/37), 50.8% (65/128) and 35.1% (95/271), the HIV incidence rate were 10.0 (95% CI: 6.2-13.9)/100 person-year (PY), 12.9 (95% CI: 9.8-16.1 )/100PY, 6.8 (95% CI: 5.4-8.2)/100 PY, and TDR prevalences were 7.4% (2/27), 2.0%, (2/98) and 4.9% (11/226), among student MSM, NSYM, and NSNYM, respectively. Among HIV positive student MSM with age <21 years, the proportion of HIV recent infection is 90.9% (10/11). Factors independently associated with HIV recent infection in student MSM was usage of recreational drug in the past 6 months (adjusted odds ratio [aOR]: 2.5; 95% CI: 1.0-5.8).Conclusions:College student MSM had higher proportion of HIV recent infection and TDR than the youth and older MSM in China during 2012-2013. The HIV infections were more likely to happen during the early year of college life among student MSM.