银基汞膜电极测定苯胺中的微量硝基苯

利用银基汞膜电极对苯胺中的微量硝基苯进行了测定.结果表明:硝基苯在-0.575 V(vs.Ag/AgCl)处有一良好的方波伏安峰;在1～500 ppm范围内,其浓度与方波伏安峰的电流峰值呈很好的线性关系;检出限为0.25 ppm.本法简便快捷,灵敏度高,结果准确,特别适合于苯胺生产线上的质量中控操作以及终产品的检测.     

4-(1-芳基-3-烃基-3-氧代丙胺基)-N-(5-甲基-3-异噁唑基)苯磺酰胺的 合成与抗糖尿病活性的初步研究

为寻找新型高效低毒的过氧化物酶体增殖物激活受体(PPAR)激动剂, 通过Mannich反应一步合成了13个含有磺胺甲噁唑结构单元的未见报道的β-氨基酮衍生物, 收率为39.8%～92.5%. 化合物的结构通过IR, 1H NMR, 13C NMR, ESI MS和HRMS表征. 生物活性测试结果表明, 化合物1a能够显著激活PPAR反应元件. 文中还对合成反应条件及化合物结构-活性关系进行了初步讨论.     

5-氯尿嘧啶质子转移异构化的密度泛函理论研究

采用密度泛函B3LYP/6-311+G**方法,对5-氯尿嘧啶分子内质子转移及水助催化质子转移引起的互变异构反应机理进行了计算研究,获得了互变异构过程的反应焓、活化能、活化吉布斯自由能和质子转移反应的速率常数等参数。计算结果表明,5-氯尿嘧啶无论是孤立分子还是一水合物,其双酮式CU1是最稳定异构体,由双酮式向烯醇式异构化找到3条通道(P1,P2,P3),各通道速控步骤的活化能分别为177.85、177.05和197.58kJ/mol。当水分子参与反应以双质子转移机理异构化时,活化能显著降低,各通道速控步骤的活化能依次降为66.24、69.36和77.85kJ/mol,有利于双酮式向烯醇式或酮醇式转变。计算结果还表明,氢键作用在增大5-氯尿嘧啶一水复合物稳定性、降低质子转移异构化反应活化能等方面起着重要作用。     

Oxide-apertured VCSEL with short period superlattice

Novel distributed Bragg reflectors (DBRs) with 4.5 pairs of GaAs/AlAs short period superlattice (SPS)used in oxide-apertured vertical-cavity surface-emitting lasers (VCSELs) were designed. The structure of a 22-period Al0.9Ga0.1As (69.5 nm)/4.5-pair [GaAs (10 nm)-AlAs (1.9 nm)] DBR was grown on an n+ GaAs substrate (100) 2° off toward (111)A by molecular beam epitaxy. The emitting wavelength was 850 nm with low threshold current of about 2 mA, corresponding to the threshold current density of 2 kA/cm2. The maximum output power was more than 1 mW. The VCSEL device temperature was increased by heating ambient temperature from 20 to 100 ℃ and the threshold current increased slowly with the increase of temperature.     

多功能电测教学实验装置的开发与实践

 介绍多功能电测教学实验装置的基本结构和功用，简 述新增电测项目的实验和计算方法. 通过具体的电测实验， 证明该实验装置测试效果良好.     

蔗糖铁口服液抗贫血作用实验研究

用蔗糖铁络合物配伍太阳神鸡蛇提取液（生物健）、维生素Ｃ等制作蔗糖铁口服液；用低铁料造成大鼠贫血模型（Ｈｂ由１１０ｇ／Ｌ下降到６０±４ｇ／Ｌ）并将动物分为四组，Ａ组继续喂低铁料，Ｂ、Ｃ、Ｄ组在低铁料基础上分别加８×１０－６、１６×１０－６、３２×１０－６元素铁（来自蔗糖铁口服液）．２８天后断头取血测Ｈｂ、血清铁、肝脏铁．结果表明实验组血清铁、肝脏铁均比Ａ组高，血红蛋白Ａ组继续下降至３３．９±１２．０ｇ／Ｌ，而Ｂ、Ｃ、Ｄ组则分别为５５．４±１２．８、９２．０±８．０、１１０．０±６．０ｇ／Ｌ，本研究提示蔗糖铁口服液具有良好的抗贫血作用．     

Flexible Bis(benzimidazole)-based Ligands Directed the Structure Characteristics of Coordination Polymers Based on Diphenic Acid Co-ligands:Syntheses,Structures and Properties

Two new coordination polymers [Cu_2(bbim)(dpa)_2(C_2H_5OH)_2](1), [Co(dpa)_2(bbbm)](2)(H_2dpa = diphenic acid, bbim = 1,1?-(1,6-hexanediyl)bis-1H-benzimidazole, bbbm = 1,1?-(1,4-butanediyl)bis-1 H-benzimidazole) constructed from bis(benzimidazole)-based ligands with different lengths and diphenic acid co-ligand have been synthesized under solvothermal conditions.Complex 1 possesses Cu-dpa helical chains. The adjacent chains are connected by the bbim ligands into two-dimensional(2D) 3-connected(63) topology. Differently, the layer structure of 2 was consisted by one-dimensional chains containing alternated 8-and 18-membered rings. Furthermore,the thermal stability and fluorescence property for all crystalline materials have been investigated.     

基于粗集理论的MIB变量开采

利用粗集理论对大量的MIB（Manager information base)变量进行数据挖掘,找出反映网络故障现象的MIB变量组及其逻辑组合关系,通过对网络故障采集的MIB变量离散化,运用粗集方法去处错误和不必要的数据,提取表现故障现象的规则,并将规则用于设计计算机网络故障诊断程序,给出了具体的分析过程和算法的实现步骤。     

指纹图像脊线提取

在分析指纹纹线特点的基础上,提出了基于多窗口的区域方向图滤波法.该方法利用指纹图像的局部区域内纹线方向的一致性和区域间纹线方向的相关性,有效地确定了纹线的区域方向,解决了单窗口区域方向图法中存在的局部误判问题,进而实现了沿指纹纹线方向的滤波,提取出了指纹的脊线.