可聚合手性酰胺类单体的合成

以S-(+)-1-甲基环己乙胺或S-(-)-1-甲基苯乙胺为手性源,分别与甲基丙烯酰氯和10-十一烯酰氯酰胺化合成了4个典型的可聚合手性酰胺类单体,其结构经NMR,IR和元素分析表征。     

新型实时时钟芯片DS12887原理与运用

ＤＳ１２８８７为ＤＡＬＬＡＳ公司生产的实时钟芯片，除具有实时钟功能外，它还具有１１４字节的这用ＲＡＭ，内藏锂电池，并与广泛应用的ＤＳ１２８７，ＭＣ１４６８１８Ｂ脚对脚兼容。本文对应用角度出发，概述了其功能特点，外部特性，内部结构及与微机芯片的接口应用。     

颗粒超导体中静电效应的非对角项对有序转变的影响

本文用有限温自洽类声子近似,对引入静电能的非对角项后颗粒超导体中相有序转变的影响进行了计算。发现比不考虑非对角项时,其相有序转变温度T_c~*降低,相有序的出现临界值α_c提高。     

Ar作稀释气体的长寿命XeCl激光器的研究

稀释气体对 XeCl 激光性能有重大影响,对此理论上实验上都巳进行了大量的研究。常用的稀释气体是 He。但理论上 He 的激发态和电离电位太高(>19eV),结果由弹性碰撞所引起的能量损失相当显著,因此,Ar 作为 XeCl激光的稀释气体可能比 He 更合适。另一方面,He、Ne 与 Ar 的价格相差十分悬殊,用价廉易得的 Ar 作为 XeCl 激光的稀释气体,预计可以大大降低 XeCl 激光运转的成本,这对实际应     

两种新型四甲川苯乙烯菁染料的激光输出特性

用脉冲Nd:YAG激光倍频(532nm,脉宽10ns)作泵浦源,测定了两种新型四甲川苯乙烯菁染料的激光输出特性,中心激光波长分别为670nm和718nm。经过二级放大,激光转换效率达5％和9％。     

浅谈光纤入户的规划、施工及检测要点

网络技术、信息技术高度发达,光纤通信技术已经相当成熟,在生产生活中得到了广泛的普及与应用。光纤通信具有传输速度快、稳定性高、安全可靠的优势,能够为人们提供更好的网络通信服务。通过对光纤入户的概念、优势进行简单阐述,从规划、施工、检测等多个角度入手,详细探讨光纤入户的操作规程,为以后的光纤入户施工提供了重要的方向指引,对我国光纤通信事业的健康发展具有重要的借鉴意义。     

STUDIES ON RESPONSE CHARACTERISTICS OF DRUG ISE''''S (Ⅳ) SELECTIVITY OF, DRUG ISE''''S WITH HETERO-POLY ACID ANION SITE TOWARD METAL IONS

The relationship between the selectivity of six drug ion-selective electrodes with anionic species of hetero-poly acid as exchange site and the structural and thermodynamical parameters of the metal ion has been investigated experimentally and theoretically. The electrode selectivity is controlled mainly by the extractibility or hydrophobicity of the metal ion, but not by the ion-association-complex formation process. Linear relationship exists between the pK_(ij) value and the structural parameter z~2/(r + 0.85) and the thermodynamic parameter of hydration (△G_h) of the metal ion. Better correlation is obtained for the pK_(ij)vs. (z~2/r)~(-k) relationship.     

Comparative Characterization of InGaN/GaN Multiple Quantum Wells by Transmission Electron Microscopy, X-Ray Diffraction and Rutherford Backscattering

The composition, elastic strain and structural defects of InCaN/CaN multiple quantum wells （MQWs） are comparatively investigated by using x-ray diffraction （XRD）, transmission electron microscopy and Rutherford backscattering/channelling. The InGaN well layers are fully strained on CaN, i.e. the degree of relaxation is zero. The multilayered structure has a clear defined periodic thickness and abrupt interfaces. The In composition is deduced by XRD simulation. We show how the periodic structure, the In composition, the strain status and the crystalline quality of the InGaN/GaN MQ, Ws can be determined and cross-checked by various techniques.     

三原子准分子辐射寿命公式(RLF)

该文首次报道了三原子准分子辐射寿命公式(RLF)。利用RLF对三原子准分子的物理量计算结果表明,它与实验值比较吻合。 根据海森堡测不准原理,我们假设受激准分子