有限维线性空间上子空间并的性质的一个注记

对于特征为零的域上的有限维线性空间的子空间的并,我们知道下述性质:有限个互不包含的非平凡子空间的并不是原来的线性空间.一方面,本文通过介绍有限维线性空间中任一子空间与齐次线性方程组解子空间的关系,及商空间的维数公式,给出了上述性质的一个改进证明.另一方面,本文把仿射簇的概念和子空间联系起来,并根据仿射簇的一个简单性质,给出了上述性质的另一个更为简洁的证法.     

亚纯函数的正规族

In this paper, we deal with the problem of normal families concerning share-values. The results extend and improve some theorems put forward by Miranda, Pang, Chen, Hua and Fang. Moreover, we answer one question posed by Gu, Pang, Fang and so on.     

A CENTRAL LIMIT THEOREM FOR STRONG NEAR-EPOCH DEPENDENT RANDOM VARIABLES

In this paper, a central limit theorem for strong near-epoch dependent sequences of random variables introduced in [9] is showed. Under the same moments condition, the authors essentially weaken the "size" requirement mentioned in other papers about near epoch dependence.     

ITERATIVE QUASI-LIKELIHOOD FOR SEEMINGLY UNRELATED REGRESSION SYSTEMS

In the seemingly unrelated regression systems, the existing quasi-likelihood is always involved in the difficult problem of calculating inverse of a high order matrix specially for large systems. To avoid this problem, the new quasi-likelihood proposed in this paper is based mainly on a linearly iterative process of some unbiased estimating functions. Some finite sample properties and asymptotic behaviours for this new quasi-likelihood are investigated. These results show that the new quasi-likelihood for parameter of interest is E-sufficient, iteratively efficient and approximately efficient. Some examples are given to illustrate the theoretical results.     

Ultrafast Optical Kerr Effect of ConjugatedSilver Phenylacetylide Complex Oligomer

Conjugatedpolymerswithlargethird-orderopticalnonlinearityhavebeedfocusedfortheirpromisingpotentialsforadvancedmaterialsapplications'.Recently,investigationsoftransitionmetalwithorganicligandsystemshavebeengreatlyintensifiedduetothedelectronsincorporatedintheconjugatedsystem,whichareexpectedtoellhancethehyperpolarizability.Phenylacetyleneandthemetalphenylacetylidesplayimportantrolesinformationofuniquecoordinatedc-lusters',butitseamsthatthestudyofmetalphenylacetylides,particularlyofthesilverphen…     

卡宾与醚C—H键插入反应的理论研究（Ⅲ）：CX（X=H,F,Cl）与甲乙醚C—H键插入反

用量子化学从头计算方法在ＭＰ２／６－３１Ｇ（ｇ）水平上研究了ＣＸ２（Ｘ＝Ｈ，Ｆ，Ｃｌ）与甲乙醚的Ｃ－Ｈ键插入反应，在甲乙醚的３个不同的Ｃ－Ｈ键（即甲基中ａ′－Ｃ－Ｈ键，乙基中ａ－Ｃ－Ｈ键和β－Ｃ－Ｈ键）上，反应势垒分别为１２３．８，３２．５，１５７．３ｋＪ／ｍｏｌ（Ｘ＝Ｃｌ）和２５４．３，１３０．０．３０４．２ｋＪ／ｍｏｌ（Ｘ＝Ｆ）。亚甲基与毗邻氧原子的各Ｃ－Ｈ键插入反应没有势垒，与乙基中β－Ｃ－Ｈ键插入势垒仅３．４ｋＪ／ｍｏｌ．甲乙醚中乙基α－Ｃ上的Ｃ－Ｈ键最有利于ＣＸ２的插入，甲基上的Ｃ－Ｈ键次之，乙基β－Ｃ上的又次之。     

"色谱分离分析技术在生化检验中的应用"引言

现代色谱概念的提出，至今已有100多年的历史。1903年俄国植物学家Tswett在华沙自然科学学会生物学会议上发表了题为“一种新型吸附现象及其在生化分析上的应用”的论文。三年后，他将这种方法命名为色谱法（Chromatography），并于1907年的德国生物学术会议上向人们公开展示了采用色谱法提纯的植物色素溶液以及色谱图。一个世纪以来，伴随着科学技术的不断进步，色谱概念和范畴也发生了很大的变化，出现了目前常用的高效液相色谱、气相色谱、薄层色谱、凝胶渗透色谱、纸色谱、毛细管电泳，以及正在迅速发展的多维色谱和微流控芯片等。色谱的应用领域不断拓宽，在医药卫生、环境健康、食品安全、石油化工、有机合成、新能源开发、乃至空间探索等诸多领域发挥了重要的作用。色谱分析与各种有关的联用技术的出现，如色谱-质谱联用，色谱-荧光分析联用等开辟了复杂混合物分析检测的新天地。     

First experimental research of the bunch compressor at CAEPLI

Magnetic bunch compressor is one of the key technologies on the path to next generation accelerator driven facilities. In this paper we report the design principles and the first experimental research of the bunch compressor developed at Chinese Academy of Engineering Physics (CAEP). The length of the bunch after compressor is found to be about 0.7 ps (rms) and the peak current exceeds 500 A when operated in the optimized condition. The sensitivity of the bunch length on the phase of the acceleration field and magnetic field of the bunch compressor was also measured and analyzed.     

Gnetifolin L and O, Two Dimeric Stilbenes from Gnetum Montanum

GnetuI)1monlanlImgr0wsinthes0uthernpart0fChinaandhasbeenusedf0rthetreatment0fbronchitisandarthritisinf0lkmedicinel.Previously,aninvestigationofthisspeciesledt0theis0lationofs0meaIkal0idsanddibenzyletherderivatives2.lnourstudies,tenc0mp0nentsincludingresveratr0l,is0rhapontigenin,daucoster0l,O-sitosterol,stearicacid,gnetif0linE,gnet0l,is0rhapontigenin-3-O-6-gluc0pyra(-)8-viniferinandgnetifolinCwere0btainedfromthisplant'.Inthefurtherstudy,f0urnewdimericstilbenesnamedgnetif0IinMandN',gnetifoli…