基于均匀化理论的拓扑优化算法研究

在研究均匀化理论和拓扑优化理论基础上，推导了复合材料的均匀化求解方程，并将均匀化理论应用于拓扑优化中，推导了基于均匀化理论的二维拓扑优化求解算法。     

喷枪运动速率对熔射皮膜温度影响的分析

采用基于匀质化理论的宏细观连成温度场计算数学模型，模拟了等离子熔射过程中皮膜生长过程及其温度场，并采用不同的喷枪运动速率研究其对熔射中皮膜生长过程温度场的影响，以期得到合理的喷枪运动速率和改善皮膜质量．     

新型明弧硬面药芯焊丝研制

研制出了新型明弧硬面药芯焊丝 ,堆焊层的显微组织为马氏体加少量残余奥氏体 ,在马氏体上弥散分布着细小的碳化物、氮化物和碳氮化物质点 .试验结果表明 :新型明弧硬面药芯焊丝堆焊层的结合强度高 ,有良好的耐磨性能、抗疲劳裂纹和剥落性能 .堆焊层的硬度为 5 1～ 5 3HRC ,堆焊层硬度不均匀性为± 1.5HRC     

STRUCTURE OF TRISUBSTITUTED TUNGSTOSILICATE ANION [A-β-SiW_9Al_3(H_2O)_2O_36(μ_3-O2/2)]_2~14-

<正> Crystal of H14C[A-β-SiW9Al3(H2O)2O36(μ3-O2/2)]2 ·8H2O belongs to monoclinic system, space group P2/m. with a= 1 7. 525(6), b=14.348(3). c= 21. 669(8) A , β=113. 12(8)°, V = 5011 (3) A3,Z = 2. Dc = 3. 254 g. cm-3, A (MoKα) = 0. 70169 A , μ=223. 21 cm-1, F(000) = 4614, T = 298K. R=0. 066 for 3010 unique reflections [I≥5σ(I) ]. The crystal consists of water molecules, protons (or H3O+ ) and dimeric anions [A-β-SiW9Al3 (H2O)2O36(μ3-O2/2)D214.the half of which has a SiO1 tetrahedron in the center, a W3O13 group, two W2Al(H2O) O12 groups and a W2AlO13 group around the SiO4.     

Synthesis and Characterization of Benzimidazolium Salts as Novel Ionic Liquids and their Catalytic Behavior in the Reaction of Alkylation

A new series of ionic liquids have been prepared containing benzimidazolium cation (abbreviated as Bim). These salts were characterized by DSC, NMR, elemental analysis and thermogravimetric analysis. They showed different properties compared to imidazolium cation due to the introduction of benzene ring. The alkylation of benzene/diphenyl ether with 1-dodecene was carded in C4eBimBr-AlCl3 ionic liquids showing high catalytic activity when the mole ratio of C4eBimB:AlCl3 was 1:2.     

Ab initio studies on the pyrolysis mechanism of 2-haloacetic acids in the gas phase

The dehydrohalogenation mechanism of 2-haloacetic acids (XCH2CO2H, X=F, Cl and Br) has been studied theoretically by HF/3-21G and AM1 methods. The results indicate that these reactions are most probably proceeded in terms of a polar five-membered cyclic transition state in the gas phase. Their microscopic processes are beleived to be a stepwise reaction and the rate-determining step is the first one. By comparing the energy barriers of different 2-haloacetic acids, it can be realized that 2-fluoroacetic acid is easier to react than 2-chloroacetic and 2-bromoacetic acids.     

Studies of Ce（Ⅲ）-ALC-F^- Interacting with Herring Sperm DNA by Electrochemical,Fluorimetric and UV-spectrophotometric Method

Ce(Ⅲ)-ALC-F^- complex can react with hsDNA to form an electrochemically non-active supermolecular complex Ce(Ⅲ)-ALC-F^--DNA in the buffer solution of (CH2)6N4(pH=4.9),which results in the decrease of the peak current of Ce(Ⅲ)-ALC-F^-.This method can be applied to determine DNA concentration.In addition,by using fluorimetric and UV-spectrophotometric methods with studies of denatured DNA and the effect of NaC1 solution,it is also found that the binding mode is intercalation.     

Photolyse von Monochloressigsäure bei 253,7 nm in wäßriger Lösung

The photolysis of 0.5 mole/l monochloroacetic acid in aqueous solution at 253.7 nm was studied and as products were determined: Cl^? (?=0.34), CH₂OHCOOH (?=0.19), CO₂ (?=0.12), CH₃COOH (?=0.08), HCHO (?=0.004) and CH₄ (?=0.001). Based on these results a probable reaction mechanism is discussed to explain the rather complicated process.     

新疆喀什市地下水系统管理模型研究

本文运用系统工程的理论和方法对喀什市地下水系统进行分析和研究,提出系统的数学模型;探讨了模型优化识别问题;研究了"系统"响应函效的含义及其求解、验证方法.最后,利用响应矩阵法建立地下水系统管理模型,通过数字仿真、灵敏度分析,证明了该模型运行结果准确可靠,可供决策部门参考.     

The Preparation of Perovskite Nano Powder by Sol-gel from DTPA and the Mechanism of Thermal Decomposition

Dy0.8Sr0.2FeO3 nano powder, a synthetic oxide, is made by sol-gel method from metal nitrate and diethylenetriaminepentaaeetic acid (DTPA), and the processing parameters are optimized.The process of the preparation, thermal decomposition and the property of the powder are studied by TG-DTA, IR, TEM, and XRD. The diameter of the average grain is about 70 nm. This new technique can be used in the preparation and the studying of ha‘no materials in the complex oxide system.