生物降解ε—己内酯／d,l—丙交酯共聚物的合成与表征

采用一种新型的稀土配位化合物Ｙ（ＣＦ３ＣＯＯ）３／Ａｌ（ｉ－Ｂｕ）３为催化剂，制备了不同组成的ε－己内酯／ｄ，ｌ－丙交酯共聚物，并用ＧＰＣ、ＮＭＲ和ＤＳＣ表征了共聚物的结构．结果表明通过改变初始投料中两种单体的比例，可以调节共聚酯的化学结构，而共聚物的形态则受结构影响很大．     

人工神经网络模型在非ABO3型希土复氧化物电阻率特性分析中的应用

目前,人工神经网络在模式识别及其他领域的应用引起了普遍的关注.本文叙述“反向传播”神经网络模型,算法和在非ABO_3型希土复氧化物电阻率分析中的应用,实验结果表明,神经网络的判别正确率为100％,因此,该方法可望成为化合物分析,材料设计的辅助手段.     

Different detection systems for the HPLC analysis of oxylipins, by-products of the enzymatic generation of 2E-hexenal

The incubation of 13-hydroperoxy-9Z,11E,15Z-octadecatrienoic acid (13-HPOT) with a hydroperoxide lyase containing extract of mung bean seedlings (Phaseolus radiatus L.) led not only to the formation of 2E-hexenal, but also to the generation of several non-volatile by-products (oxylipins). These oxylipins, generated by the catalysis of other 13-HPOT metabolizing enzymes, were analyzed by high performance liquid chromatography (HPLC) without time-comsuming derivatization procedures, which would be necessary for their volatilization and stabilization during gaschromatography (GC). Different detection systems such as an evaporative light-scattering detector (ELSD), diode-array detector (DAD), and particle beam-mass spectrometry (PB-MS) were applied. The utilization of an ELSD represented an improvement of sensitivity compared to a DAD, especially in the case of substances with low UV-activity.     

A novel[2 + 3]cycloaddition reaction: singlet oxygen mediated formation of 1,3-dipole from iminodiacetic acid dimethyl ester and its addition to maleimides

Sensitized photolysis of iminodiacetic acid methyl ester and maleimides follows a [2 + 3] cycloaddition pathway yielding pyrrolidine derivatives. This is similar to the photochemical reaction between C(60) and amines. A series of pyrrolidine derivatives are prepared by the method including multipyrrolidines from bis- and tris-maleimide starting materials. The yields range from 13% to 85%. The reaction is highly stereoselective. All the isolated products have the 1,3-dimethoxycarbonyl groups in the cis configuration. Various sensitizers may be used with slightly different yields. A plausible mechanism is proposed that involves the singlet oxygen abstraction of two alpha hydrogen atoms from the iminodiacetate and formation of a 1,3-dipole with a structure similar to the classical thermally generated 1,3-dipole.     

用傅里叶变换红外光谱差减技术自动监测大气毒物的软件及应用

本文介绍了大气毒物傅里叶变换红外光谱自动差减定量软件，介绍了方法的原理和软件的结构与功能。该技术能够进行数据库的实时咨询，差减谱位的智能搜索和光谱自动差减定量，实现了大气毒物自动定量分析。运用于实际样品分析，快速准确，优于其它的傅里叶变换红外光谱定量技术。     

碘化亚铜微晶掺杂硅酸盐玻璃的制备及其光学性质

采用可分相的Na2O－Al2O3－B2O3－SiO2系为基础玻璃，以CuO／SnO、NaI为原料分别引入Cu＋、I－，成功地制备出CuI激晶掺杂硅酸盐玻璃．通过X射线粉末衍射（XRD）和高分辨透射电镜（HRTEM）分析观察到玻璃中的晶相和微晶的分布情况；由玻璃的室温透射光谱研究了玻璃的热处理条件与光吸收性的关系．实验发现，该玻璃对Nd：YAG激光器腔内自由振荡具有脉定压缩效应．     

线性变位极谱法研究（Ⅸ）——CAEM过程配位吸附溶出可逆波理论

本文报道CAEM过程配位吸附溶出可逆波理论，用铟（Ⅲ）－铜铁试剂－醋酸和醋酸钠缓冲体系进行验证，实验结果与理论相符。     

Magnetic and magneto-optical properties of Cu-doped Bi,Ga:DyIG and Bi,Al:DyIG films prepared by sol-gel

Cu doped Bi,Al:DyIG and Bi,Ga:DyIG thin films have been prepared on glass substrates by sol-gel method. As-deposited films were amorphous, and after annealing polycrystalline magnetic thin films could be obtained. X-ray diffraction pattern showed that the films were garnet phase with no preferred crystal orientation. The H _c value of 7 kOe was obtained in Cu doped Bi, Al:DyIG films, and the Faraday rotation angle was about 7°/µm at the wavelength of 500 nm. An extremely high H _c value of 13 kOe at room temperature has been got in Bi, Ga:DyIG films, and the Faraday rotation angle was 8°/µm at the wavelength of 510 nm for the optimum value of Ga content. The perpendicular magnetic anisotropy (Ku) of garnet films on glass substrate resulted from the inverse magnetostriction. The influence of doping and garnet composition on magnetostriction has been studied. The mechanism of increasing coercive force by Cu doping could be attributed to Cu entering lattice sites.     

含氟表面活性剂溶液的动态表面张力研究

本文研究了阳离子氟表面活性剂CF₃CF₂CF₂O(CF(CF₃)CF₂O)₂CF(CF₃)CONH(CH₂)₃N⁺(C₂H₅)₂CH₃I^-(简写FC-4 )的动态表面性质，利用Krüss K12和MBP动态表面张力仪分别测定了该体系的平衡表面张力和动态表面张力。由平衡表面张力测定结果得到了临界胶束浓度和表面吸附量。利用渐进的Ward and Tordai方程对动态数据进行了分析。结果表明：在吸附的最初阶段符合扩散控制模型，而在吸附的后期，证明了吸附势垒的存在，表明在吸附后期属于混合动力学模型。计算得出25 ℃时，该体系势垒约在25到35 kJ/mol. 由于氟表面活性剂分子间作用力小，表面压是导致吸附势垒的主要原因。