遗传算法的进展及其在电子对抗中的应用

介绍了遗传算法是一种源于进化论和基因遗传学的新的智能优化算法．概述了其基本思想、操作方法、优点和问题，并介绍了近年来对遗传算法的改进和应用研究，最后对其在电子对抗领域中的应用现状作了分析和展望．     

化学实验中合作策略的研究

学生从实验中获得知识、发展培养各方面能力,在这个过程中,小组合作探究是最佳方式。相对个别学习,我们提出了小组合作学习,也就是学生进行分工合作在各自小组中共同完成学习任务,其本身也是一种学习的组织形式。作者就化学实验中如何发挥学生的合作能力进行了研究,旨在提高学生独立自主性的同时培养其团结合作能力,以适应现代教育改革的需要。     

Kinetics Study on the Thermal Decomposition of Europium p-methyl benzoate Complex with 1, 10-penanthroline under Non-isothermal Con ditions

The thermal decomposition reaction of Eu2(p-MBA)6(PHEN)2 (p-MBA=CH3C6H4COO, methylbenzoate;PHEN=C12H8N2, 1,10-phenanthroline) was studied in a static atmosphere usingTG-DTG method. The thermal decom position process of the complex was determined and its kinetics was investigated. Kinetic parameters were obtained from the analysis of TG-DTG curves by means of the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) method.The most probable mechanism functions of the thermal decomposition reaction for the first stage are: f(α)= (1-α)2,g(α) = (1 -α) 1- 1. The activation energy for the first stage is 255.18 k J/mol, the entropy of activation AS is 227.32 J/mol and the Gibbs free energy of activation AG is 128.04 k J/mol.     

热处理对硬质合金钎焊焊缝强度的影响

硬质合金钎焊后进行淬火、回火处理,焊缝强度明显下降。本文分析了钎焊焊缝强度下降的原因,并提出改进措施。     

圆锥螺纹中径的测量及不确定度分析

本文叙述了在万能测长仪上用L形斜块和三针组合测量圆锥螺纹中径的方法，并介绍了L型斜块的设计和制作方法及各部分尺寸的确定。最后对该测量方法的不确定度进行了分析。     

PRODAVE在S7-300PLC监控系统中的应用

介绍了PRODAVE在S7-300PLC监控系统中的应用，包括硬件连接和软件设计过程，实践证明，此方法能够满足工程实践的要求。     

Microstructure and mechanical properties of CeO2 doped diamond-like carbon films

A kind of rare earth oxide, CeO₂, was doped into the diamond-like carbon (DLC) films with thickness of 180–200 nm, using unbalanced magnetron sputtering. All the adhesion strength of CeO₂ doped DLC films is increased, while the residual compressive stress is obviously decreased compared to pure DLC film. Specially, the residual compressive stress of the deposited films are reduced by 90%, when the CeO₂ content is in the range of 5–7%, from a value of about 4.1 GPa to 0.5 GPa. When the CeO₂ content is increased to 10%, the deposited films possess the highest adhesion strength of 85 mN, 37% higher than that of pure DLC film. The nanohardness and elastic modulus exist a transition point at 8% of CeO₂ content within the DLC film. Before this value, nanohardness and elastic modulus of CeO₂ doped DLC films are lower than those of pure DLC film, and after this value, they are higher or adjacent to those of pure DLC film. Auger electron spectroscopy shows a more widened interface of 6% CeO₂ doped DLC film compared to pure DLC film. The enhancement of adhesion strength is mainly attributed to the widening of the film-substrate interface, as well as the decrease of residual compressive stress.     

Fractal Dimensions of Simulated and Real Fat Crystal Networks in 3D Space

The microstructure of fat crystal networks is closely related to rheological properties of fat products, and thus is of particular interest to food scientists. The fractal dimensions of fat crystal networks calculated by microscopy methods such as box-counting, D _b, particle-counting, D _f, and mass fractal dimension, D _m, have been extensively employed to quantify the microstructure of fats. This work revealed the microstructural basis of D _b, D _f, and D _m in 3D space through both computer simulation and experiments on the high melting fraction of milk fat crystal networks. Similar to our previous simulation study on the fractal dimensions of fat crystal networks in 2D space, D _b is sensitive to crystal size, area fraction, and not sensitive to distribution orderliness of crystals, which is the percentage of evenly distributed fat crystals within the simulated fat crystal networks. D _f and D _m were not affected by any of the microstructural factors studied in the simulation.     

Eu~(2+) Luminescence in BaZnAl_(10)O_(17)∶ Eu Phosphor

Ａｎｉｍｐｏｒｔａｎｔｃｌａｓｓｏｆｆｌｕｏｒｅｓｃｅｎｔｌａｍｐａｎｄｐｌａｓｍａｄｉｓｐｌａｙｐｈｏｓｐｈｏｒｓｉｓｂａｓｅｄｏｎｃｏｍ ｐｏｕｎｄｓｏｆｔｈｅａｌｋａｌｉｅａｒｔｈ ｒａｒｅｅａｒｔｈａｌｕｍｉｎａｔｅｓｙｓｔｅｍｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｈｉｇｈｌｕｍｉｎｅｓｃｅｎｔｅｆｆｉ ｃｉｅｎｃｙａｎｄｓｔａｂｉｌｉｔｙｕｎｄｅｒｕｌｔｒａｖｉｏｌｅｔａｎｄｖａｃｕ ｕｍｕｌｔｒａｖｉｏｌｅｔｌｉｇｈｔｅｘｃｉｔａｔｉｏｎ[1] .Ｅｓｐｅｃｉａｌｌｙ ,ａｌｋａｌｉｎｅｅａｒｔｈｈｅ…