带有修正项的双边投影拟牛顿方法

本文中我们对Nocedal与Overton所提出的双边投影拟牛顿方法加以改进,增添一个修正项。这个修正项的计算量是很少的,但修改后的方法可以同时改进局部收敛性与全局性收敛性。本文将集中讨论局部收敛性,特别是证明了在使用DFP或PSB等矩阵校正公式时,修正后的方法在一定的条件下是超线性收敛的。对于全局收敛性的讨论将另文给出。     

光学速调管结构喇曼自由电子激光器研究

本文提出光学速调管结构喇曼自由电子激光器总体实验设计。采用一维单粒子模型对光学速调管结构目由电子激光器增益和效率的提高进行了研究。 关键词：     

THE TSHB TECHNIQUE FOR MATERIAL TESTING AT HIGH RATES OF STRAIN

The material testing technique of Torsional Split Hopkinson Bar(TSHB)isinvestigated in this paper.It can solve nearly all the problems of Split Hopkinson PressureBar(SHPB).Furthermore. accurate experimental results can be obtained in largedeformation condition.In this paper some dynamic stress-strain curves of some engineeringmaterials are also given which are obtained from a TSHB apparatus made by ourselves.     

单扫描示波极谱法测定磷酸氯喹

建立了极谱测定磷酸氯喹的方法。在4.0×10-2mol LNH3·H2O NH4Cl(pH9.5)支持电解质中,磷酸氯喹极谱还原波的峰电位Ep为-1.61V(vs.SCE),其二阶导数峰峰电流ip″与磷酸氯喹浓度在1.0×10-8mol L～1.0×10-6mol L和1.0×10-6mol L～1.0×10-4mol L范围内呈线性关系。10次测量1.0×10-6mol L磷酸氯喹还原波二阶导数峰峰电流,相对标准偏差RSD为0.92%。该方法用于片剂中磷酸氯喹的测定。     

具有农药活性的微生物源核苷类化合物

微生物天然产物在新农药的研究与开发中占据着重要的地位。核苷作为一类重要的生理活性物质, 具有丰富多样的结构及生物活性。本文对微生物来源的具有农药活性的核苷类化合物进行总结,重点综述了具有农药活性的微生物源嘧啶或嘌呤、核苷及其衍生物及核苷酸类似物等三类微生物源核苷类化合物,分别对其来源、结构多样性、农药活性及杀虫、杀菌及抗病毒作用机制进行了概括, 以期对新型农用抗生素的开发及新农药创制提供一些有益的借鉴。     

稀土—桑色素配合物的研究

报道了固态Ln(Ⅲ)-桑色素(C_(15)H_(10)O_7·2H_2O)配合物的合成方法,并通过红外光谱、紫外光谱、核磁共振谱、萤光光谱、差热-热重分析、X射线四圆衍射和摩尔电导等手段对配合物进行了表征。结合元素分析数据确定其化学组成为Ln(C_(15)H_(10)O_7)_2Cl_3(Ln=La,Ce,Pr,Nd,Eu)。     

聚丙烯—聚对苯二甲酸乙二酯共混物的扫描电镜观察(Ⅱ)

使用扫描电镜和化学蚀刻的方法研究了聚丙烯(PP)和聚对苯二甲酸乙二酯(PET)共混物(PP:PET:9:1)在不同温度结晶时的形态结构,并与在相应条件下结晶的纯PP样品作比较。结果表明:(1)纯PP在0℃结晶时没有观察到明显的球晶,部分区域呈树枝晶,在30℃以上结晶时呈三类不同形态球晶;在0—140℃范围结晶的PP—PET共混物中都没有观察到第三类球晶和树枝晶。(2)在0—140℃温度下结晶的共混物中两组份互不相溶,PET都是以直径为1—5μ的小球分散在PP连续相的球晶内和球晶之间;PET的加入使PP球晶的尺寸比在相应条件结晶的纯PP球晶小,同时球晶的大小也随结晶温度降低而变小;PET小球与PP连续相之间存在着易受蚀刻的界面层。     

An Ionic Liquid Bulk-Modified Carbon Paste Electrode and Its Electrocatalytic Activity toward p-Aminophenol

An ionic liquid bulk-modified carbon paste electrode （M-CPE） has been fabricated by using 1-heptyl-3-methylimidazolium bromide as a modifier. Cyclic voltammetry （CV） and differential pulse voltammetry （DPV） were used to evaluate the electrocatalytic activity of the proposed electrode by choosing p-aminophenol （p-AP） as a model compound. Both at a bare carbon paste electrode （CPE） and the M-CPE, p-AP yielded a pair of redox peaks in 0.1 mol·L^-1 phosphate buffer solution （PBS, pH 7.0）. At the CPE, the peak-to-peak potential separation （AEp） was 0.233 V, while at the M-CPE the AEp was decreased to 0.105 V. Furthermore, the current response to p-AP at the M-CPE was 10.2 times of that at the CPE by DPV. The electron transfer rate constant （ks） ofp-AP at the M-CPE was 13.3 times of that at the CPE. Under the optimal condition, a linear dependence of the catalytic current versus p-AP concentration was obtained in the range of 2.0× 10^- 6 to 3.0× 10^- 4 mol·L^-1 with a detection limit of 6.0× 10^-7 mol·L^-1 by DPV. In addition, compared to other modified method the proposed electrode exhibited distinct advantages of simple prapartion, surface renewal, good reproducibility and good stability. It has been used to determine p-AP in simulated wastewater samples.