e/π Separation analysis from L3 Calorimeter Beam Test

The L3 calorimeter beam test data were analyzed.An e/π separation scheme including "key cut" and "Δ cut" is suggested.We show that,using the scheme,in the energy range 4—20GeV,e/π separation is better than 93.7%.     

Existence and Uniqueness of Matrix Padé Approximants

For the problems of the left and right matrix Padé approximations, we give the necessary and sufficient conditions for the existence of their solutions. If the left Padé approximant exists, then we prove that its uniqueness is equivalent to the existence of right Padé approximants, and we further give the exact results about the dimension of the linear space $^LR^{*}(m,n)$ formed from the left Padé approximants.     

Multivariate Padé Approximation and Its Application in Solving Systems of Nonlinear Equations

For a certain kind of multivariate Padéapproximation problems, we establish in this paper some results about the solvability and uniqueness of its solution. We alsogive the necessary and sufficient conditions for the continuity of Padé approximation operator. The application of such approximations in finding solutions of systems of nonlinear equations is considered, and some numerical examples are given, in which it is shown that the Padé methods are more effective than the Newton methods in some cases.     

一种新型磷酸铍微孔晶体的合成与表征

水热晶化法合成并培养一种新型磷酸铍微孔晶体。经多晶X射线衍射, 四圆X射线单晶结构分析, 红外光谱等测定, 其骨架结构是由磷氧四面体和铍氧四面体交替的, 通过共用顶点氧原子(氧桥形式)构成的阴离子骨架。晶体属正交晶系,空间群为Pna21, 晶胞参数a=0.8699(1)nm, b=0.856(1)nm, c=0.4953(2)nm, 晶胞体积V=0.3691(7)nm^3。Z=4, 求解结构中最后R=0.054, Rw=0.048。微孔体系由4,6和8元环组成。水分子和平衡阴离子骨架电荷的质子位于平行(100)方向的六元环通道中, 研究其热稳定性能。     

邻硝基乙酰苯胺衍生物电子结构的UPS研究

本文报道邻硝基乙酰苯胺衍生物的HeI紫外光电子能谱(PES), 同时也给出了邻硝基苯胺衍生物的PES谱。PES谱的指认由相应分子的MNDO计算所支持, 并指出带有不同取代基基团的邻硝基乙酰苯胺合成耐高温喹啉高聚物的难易依赖于PES所测化合物分子的最低电离能(IP)。     

液体混合物的推广Vander Waals理论

本文通过对Van der Waals模型中排斥体积的修正, 建立了一个液体状态方程式,并将它推广到了二元液体混合物, 预测和关联了液体混合物的过量性质, 计算结果表明, 可与Flory理论相比拟, 但所需提供的纯组分性质比Flory理论少, 计算也得到了简化.     

一些氢化茚酮和氢化萘酮物的环氧立体构型

在不同浓度的三乙胺乙酸乙酯溶液中2-甲基环戊-1,3-二酮与氯代甲基乙烯酮(1b)反应可分别得三酮、α-氯代醇或环氧双酮. α-氯代醇经X射线单晶衍射分析结果推断出环氧双酮的环氧是β构型, 其异构体为α, 用相似的方法制得的同系环氧物也经X射线单晶衍射分析, 结果表明其环氧为β构型.     

Existence of Rational Interpolation Function and an Open Problems of P. Turán

An existence theorem of rational interpolation function for the sufficient condition has correctly been stated by Macon-Dupree in [2], but some arguments in their proof are not true. In this paper: (i) A related theorem for both the sufficient and necessary condition is asserted and proved by a new and rigorous approach, namely by introducing the notion of (m/n) quasi-rational interpolant of a given function. (ii) With use of these results thus obtained an open problem proposed by P. Turán in [4] is completely solved.     

苯丙氨酸桥联手性锌双卟啉受体对胺的分子识别

金属卟啉的分子识别研究是当今卟啉仿生化学的重要课题.手性金属卟啉作为光学活性分子的对映选择识别受体和手性核磁共振试剂^[1]尤为引人注目.     

Spectral Interferences in the Determination of REEs in Samarium and Dysprosium Matrices by High Resolution Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES)

There is an increasing need for sensitive, accurate and convenient analytical techniques for rare earth elements (REEs) analysis and determination with their expanding applications. Rare earth elements (REEs) are widely used in the areas of industry, agriculture and modern technologies, e.g., as growth promotion agent in agriculture,catalyst in oil refining, additives in new ceramic material and special steels, etc. It is also finding important application in nuclear industry.