The impact of ATLAS and CMS single differential top-quark pair measurements at √s=8 TeV on CTEQ-TEA PDFs

By applying the Error PDF Updating Method,we analyze the impact of the absolute and normalized single differential cross-sections for top-quark pair production data from the ATLAS and CMS experiments at the Large Hadron Collider,at a center-of-mass energy of √s=8TeV,on the CT14HERA2 PDFs.We find that the top quark pair single differential distributions provide minor constraints on the CT14HERA2 gluon PDF when the nominal CT14HERA2 inclusive jet production data are included in the fit.Larger constraints on the gluon distribution are present when the jet data are removed(CT14HERA2mJ)and/or when increased weights are given to the top data in the CT14HERA2 fits.The weighted$t\bar t$data provide significant constraints on the CT14HERA2mJ gluon PDF,which are comparable to those obtained from inclusive jet production data.Furthermore,we examine the top quark mass sensitivity of the top-quark pair single differential distributions.     

应用不同光谱技术,动物RBC,Hb及人皮肤表面血流氧化-还原状态检测

目的:检测与分析实验动物血液RBC(RBC·O2,RBC·CO2),Hb(HbO2,HbCO2)和人体皮肤表面流动血液氧化·还原状态的成像与未成像可见光谱领域OD值特征,并为该技术对白癜风病表皮黑色素颗粒检测中的应用尊定基础。方法:利用不同光谱技术和invitro和invivo检测手段,统计分析血液不同状态下波长与位置的OD值信息。结果:invitro检测:动物血液Hb·O2和RBC·O2两者在可见领域均有367,414(Soret带)nm与541,576(Q带)nm的吸收峰位;血液Hb·CO2和RBC·CO2均有432(Soret带)与和553(Q带)nm的波长吸收峰位;血液RBC状态和Hb溶血状态波长吸收峰位无改变,只是在氧化与还原状态下有完全独立的吸收峰位,血液RBC状态和Hb溶血状态波长吸光度OD值之间,有显著性差异(p<0·01)。浓度为1·5×107cell·mL-1的RBC·O2和Hb·O2在576nm的吸收峰位吸光度(y)与红细胞浓度(x)做成两条回归曲线:既,Hb·O2(b1)^y=0·05 0·983x;RBC·O2(b2)y^=0·127 1·934x,两者之间差异有显著性(p<0·01)。invivo检测:在人手背皮肤表面ImSpector图像中RBC·O2状态在540,576nm,RBC·CO2状态在555和755nm处有吸收峰。选择(a:指甲,b:指,c:手背)三个点位分别进行波长检测,每点(n=10)545nm吸收峰的平均OD值,依次为0·83±0·001,0·73±0·001和0·62±0·001,其三处测定点的OD值之间有显著性差异(p<0·01)。结论:invitro检测的RBC与Hb两者波长吸收峰位不变,但吸光度OD值不同,认为RBC状态测定结果更接近于活体组织血管内原始状态。invivo检测对人体无任何侵袭与损伤,灵敏度高,测试时间短,并且同时获得被测样品的波长与位置信息画面等优势,有望表皮中黑素等有色颗粒的直接检测。     

M.E.SHVEZ ITERATIVE METHOD AND ITS APPLICATION IN MECHANICS

Ｍ．Ｅ．ＳＨＶＥＺＩＴＥＲＡＴＩＶＥＭＥＴＨＯＤＡＮＤＩＴＳＡＰＰＬＩＣＡＴＩＯＮＩＮＭＥＣＨＡＮＩＣＳ￥(袁镒吾，刘又文)ＹｕａｎＹｉｗｕ；ＬｉｕＹｏｕｗｅｎ（ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ，Ｃｈａｎｇｓｈａ４１...     

新疆保险公司营业大楼大体积筏板基础冬期施工

1996年，商品混凝土在乌鲁木齐还未得到广泛推广应用的情况下，不留施工缝，一次浇筑长65m，宽25m，厚1．6m，防渗等级S8这样大体积筏板基础混凝土，确有一定难度．为此，本文采取了有条件时优先选用商品混凝土，无条件或商品混凝土供应中断时现场搅拌进行浇筑的方法解决了这一难题．     

新疆干旱地区褐家鼠种群结构特征的初步研究

根据多年的实地调查数据，研究了褐家鼠在新疆干旱环境中的种群生态学特征。结果表明，褐家鼠种群内禀增长率(rm)0.221，种群周限增长率(λ)为1．247。同时还发现，褐家鼠移入新疆干旱环境后，其种群年凝结构尚未见明显变化，仍为稳定增长。     

梭梭种子发芽生理初探

梭梭种子发芽的适宜ｐＨ值范围较宽（７～１１），梭梭种子在水中浸泡１ｈｒ后种皮透性开始有较明显的增大，浸泡７ｈｒ后外修速率减慢，浸泡２１ｈｒ后渗透基本达到平衡．ＮａＣｌ和６—ＢＡ促进种子萌发，ＫＣｌ、ＫＮＯ和α—ＮＡＡ影响胚的伸展．梭梭种子中含有内源性抑制物，其Ｒ值为０．２９～０．３９．     

Quasi-soliton generation in solid-state lasers with semiconductor saturable absorber

Recent advances in ultrafast, ultra-short solid-state lasers have resulted in sub-6 fs pulses generated directly from the cavity of Ti:sapphire lasers. The generation of extremely short pulses is possible due to the formation of a quasi-Schrodinger soliton. Our investigation is directed to the peculiarities of the transition between femtosecond to picosecond generation. We found that the above transition is accompanied by the threshold and hysteresis phenomena. On the basis of soliton perturbation theory, the numerical simulation studying two different experimental situations has been performed, the first situation corresponds to the study of the lasers field's parameters under variation of control parameters (dispersion or pump power), the second one is for continuous variation of control parameter within a single generation session. Physically it corresponds to not repeated laser session but the variation of control parameter when the pulse has formed already.     

ψ辐射衰变的角分布

J/ψ和ψ′粒子辐射衰变到介子的过程是寻找胶球,混杂态,抽取gg-qq耦合的极佳场所.北京正负电子对撞机(BEPC)已经积累了大量的J/ψ和ψ′事例,即将改进升级的BEPC及美国的CLEO-c还将获取更多的事例.这里首先利用协变张量方法提供了该类过程的角分布公式,然后利用螺旋度方法给出了ψ辐射衰变到两个赝标介子的角分布公式,以此为例讨论了螺旋度方法和协变张量方法的关系.