White and Red Organic Light Emitting Materials

Derivatives of 2,3-(1,4-dialkoxyaceno)norbornadiene underwent ring-opening metathesis polymerization (ROMP) upon the catalysis of a ruthenium complex to afford the corresponding polymers. The polymeric materials containing anthracene chromophores emit white electro-luminescence, which can be fabricated into light-emitting diodes (LED). The broad emission band is composed of a blue emission from anthracene and a red emission from aggregates. A single layer device, ITO/polymer/Ca/Al, can be turned on at 7V and exhibits maximum intensity 427 cd/m2 at 15 V. A double layer device, ITO/polymer/TPBI/Mg:Ag (TPBI = (2,2′,2"-(1,3,5-benzenetriyl)-tris(1-phenyl-1H-benzimidazole)) displayed blue light with turn-on voltage 6 V and maximal intensity 930 cd/m2 at 15 V.Derivatives of bisindolylmaleimide were found to form amorphous solid films which exhibit intensive red luminescence. The property of forming glasses can be ascribed to the nonplanar geometry of these molecules. LED devices were fabricated by a layer of pure dye sandwiched between two charge transporting films. The yellow emission spectrum of the devices utilizing Alq (tris(8-hydoxyquinolinato)aluminum) contains a green component from Alq. Pure red emissions can be achieved by replacing Alq with TPBI. Typical devices can be turned on at ～3 V with maximal intensity 2000 cd/m2. White color devices are under current investigation, in which the green Alq layer is replaced by its blue derivative (bis(2-methyl-8-hydoxyquinolinato)(phenolato)aluminum).     

斜向静磁场中光导波模式转换与衍射理论

应用经典场论和耦合模理论计算了斜向静磁场作用下，磁性薄膜波导中静磁波与导波光的相互作用.计算结果表明，与垂直静磁场情形相比，斜向静磁场时的相匹配条件有所变化，由于磁性薄膜波导中法拉第磁光效应增强等因素，导波光的Bragg衍射效率得以显著增加.这有利于应用YIG等低损耗磁性薄膜做成高衍射效率的磁光波导器件，亦有利于降低Bi∶YIG等高比法拉第旋转的磁光薄膜波导器件的体积和损耗.此外，理论指出的在斜向静磁场条件下所具有的一些磁光特性与实验结果亦符合得很好. 关键词：     

过渡金属配合物催化剂及其分子设计构思的发展与相互作用

讨论了某些不对称合成和α－烯烃定向配位聚合及α－烯烃氢甲酰化的过渡金属配合物向络合催化剂的发展与催化剂分子设计构思的发展及相互促进作用，并藉以说明过渡金属配合物定向络合物催化剂的分子设计已具备向计算机辅助设计发展的科学基础。     

Quantum Interference Effect in General Rotating Systems

As the mechanical counterpart of the Aharonov-Bohm effect and the Aharonov-Cashier effect in a magnetic field, the existence and possibility of observation of a quantum interference effect between the split paths of a coherent particle beam in a uniformly rotating frame have been studied previously. The discussion is now generalized to the case of a reference frame rotating at arbitrary time varying angular velocity about a fixed center. The phase difference between the split beams of particles and the resulting interference pattern depend not only upon the speed, but also upon the orientation of the axis of rotation. The conclusion may have, therefore, inferences on gyroscopic applications.     

Ward-Takahashi Identity at Finite Temperature

A new real time formalism, based on the closed-time-path Green's function theory (CTPGF),is employed to obtain Ward-llfrkahashi identities of QED at finite temperature. It is shown that WT identity in coordinate space is of the same covariant form aa that in vacuum field theory. A perturbative check is provided to #how that in momentum spze, Takahashi's iden tities hold only in a weak sense.     

EHMO Studies of Chemisorbed Dioxygen Species on Na＿2O and K＿2O and of Their Interaction with CH＿4 and CH＿3－Radical

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ELECTRONIC STRUCTURE OF BIMETALLIC LAYERED SYSTEMS WITH RANDOMNESS IN LAYER THICKWESSESⅠ. CPA STUDY OF A SIMPLE MODEL

The influence of randomness in layer thicknesses in a blmetallic layered system, i.e., of randomness in the "modulation period" of a,bimetallic "superlattice" on its electronic structure is studied in terms of a simple model in the coherent potential approximation (CPA).Numerical examples are presented for illustration.     

A RECURSION THEORY STUDY OF THE ELECTRONIC STRUCTURE OF METALLIC SUPERLATTICES

We illustrate that the recursion method is useful in the study of the electronic structure of metallic superlattices.It reduces considerably the amount of computational works,and gives,nevertheless,fairly satisfactory densities of states.     

A Two-stage screening procedure for mailing credit assessment

Direct mailing is one of the tools of business marketing. Itcan stimulate the purchase of mail-order products or financialservices. When selecting a mailing list, we hope to obtain ahigher mailing response; on the other hand, we also have toconsider the risk of defaulting. In the case of selling financialservices, customers who respond must be examined for credit.In order to avoid jeopardizing the existing relations with suchcustomers, companies try to reduce their rate of declining suchapplicants by controlling, at the mailing stage, for the riskof choosing customers who will default. In this article, a two-stage screening procedure is constructedto solve a problem of mailing credit assessment with mailingand credit-assessment stages;A screening method can be appliedto select a mailing list at the mailing stage, while the needfor a credit assessment depends on the types of product or service.Therefore, this problem may include four possible models: screeningwith or without credit assessment and random sampling with orwithout credit assessment. Moreover, the optimal cutoff scoresare determined by maximizing total profit. A mailing exampleis then given to illustrate the use of the proposed models formailing credit assessment. Compared with a random sampling method,a screening method has a significant improvement in terms ofresponse rate, decline rate, bad rate, and total profit.     

甾体化合物 XLⅢ.16 α,17α-环氧-16β-甲基-20-羰基甾体化合物的铝氢化锂还原

16α,17α-环氧-16β-甲基-△⁵-3β-羥基孕甾烯-20酮(Ⅱ)经铝氢化鋰还原,得化合物3β,20β,17α-三羟基-16α-甲基-△⁵-孕甾烯(Ⅶ_a)、3β,20α,17α-三羟基-16α-甲基-△⁵-孕甾烯(Ⅷ_a)和3β,20β,17α-三羟基-16-次甲基-△⁵-孕甾烯(Ⅸ_a).其结构均经降解反应证明,又C₂₀-羟基的构型根据降解反应速度、分子模型及比较分子旋光差而推定.