Study of association thermodynamics between crystal violet and sodium bis(2-ethylhexyl)sulfosuccinate and kinetics of basic fading of crystal violet in microemulsions

The thermodynamics of the association between 4,4′,4″-tris(dimethyl-amino)triphenylmethyl chloride (crystal violet or CV) and sodium bis(2-ethylhexyl)-sulfosuccinate (aerosol OT or AOT) in water/AOT/n-decane microemulsion and the kinetics of the basic hydrolysis of CV in a water-in-oil microemulsion were investigated by UV–vis spectroscopic measurements. An association model of CV and AOT was used to analyze the experimental data to obtain the association constants at various temperatures. By taking the association into account, the “actual” rate constants and the activation energies of the basic hydrolysis of CV in the media of water/AOT/oil were obtained. The difference in thermodynamics and kinetics between the two media of water/AOT/n-decane and water/AOT/isooctane is discussed. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 294–300, 2008     

A new synthesis of alkynyl tellurides promoted by CsOH and 4(A°) MS

The mixture of cesium hydroxide and terminal alkynes in dry DMF in the presence of 4(A°), molecular sieves was stirred for 3.0 h at room temperature under N2, then aryltellurenyl bromide in THF was added, and the reaction mixture was stirred for 2.0 h. Alkynyl tellurides were obtained in about 90% yields by flash chromatography.     

A unified method for a class of convex separable nonlinear knapsack problems

In this paper, a unified algorithm is proposed for solving a class of convex separable nonlinear knapsack problems, which are characterized by positive marginal cost (PMC) and increasing marginal loss–cost ratio (IMLCR). By taking advantage of these two characteristics, the proposed algorithm is applicable to the problem with equality or inequality constraints. In contrast to the methods based on Karush–Kuhn–Tucker (KKT) conditions, our approach has linear computation complexity. Numerical results are reported to demonstrate the efficacy of the proposed algorithm for different problems.     

四级自动复叠系统压力保护装置的试验研究

针对五元混合工质四级自动复叠制冷循环系统启动压力过高和降温速率缓慢的问题,搭建了试验装置;设计了适合四级自动复叠循环系统的一种压力保护装置;分析了对系统压缩机吸排气压力和降温特性的影响。试验结果表明:所设计的压力保护装置能起到优化压缩机吸排气压力、加快降温速率的作用。     

四种三唑化合物的合成及它们在盐酸介质中对碳钢缓蚀性能的研究

本文通过“点击化学”的方法合成了四种1,2,3-三唑化合物(3a, 3b, 4a和4b)，通过IR, ¹H NMR, ¹³C NMR 和 single crystal X-ray 晶体结构衍射分析对化合物进行了表征。通过交流阻抗和动电位扫描极化曲线研究四种化合物在1 mol/L HCl 中对碳钢的缓蚀性能。研究结果表明，四种化合物均可作为高效阳离子缓蚀剂，其中化合物4b的缓蚀效果最好，最高抑制效率可达97％。     

Preparation and evaluation of ammonia decomposition catalysts by high-throughput technique

The high-throughput technique has been successfully employed to investigate systematically NH₃ decomposition catalysts for COx-free hydrogen production. Supported γ-Mo₂N catalysts not only could be prepared and evaluated by the high-throughput experiment, but are also active for NH₃ decomposition luke supported Ni and Co catalysts. Additionally, the preparation process and support play important roles on the catalytic performance of supported γ-Mo₂N catalysts.     

Construction of Ka-Band Preselected Harmonic Mixer

In this paper, a new method to realize pre-selected harmonic mixer is introduced. It includes a harmonic mixer, and a YIG turning filter (YTF) design. A digital driver is used for YTF, which can realize linearization modification and temperature compensation. The spectrum analyzer's out scanning voltage is given an A/D conversion and interface to digital driver.