电除尘器中电场分析计算的几点探讨

电除尘器的工作过程中电晕放电以及尘粒荷电和收集均与电场有关,如能对其电场作深入分析和计算,无疑将对电除尘器设计的改进、结构优化和除尘效率的提高,具有理论指导和实用价值。本文分析了电晕场方程的性质,论证了方程解的存在和唯一;对电晕场方程的几种数值解法以一维情况为例,作了分析判断,提出较好的求解途径和边界条件的选用;用有限元法-差分法和模拟电荷法-差分法求解了二个实例,计算结果具有较好的精度。为求解复杂电极形状和负载情况下的分析计算,积累了计算经验,对进一步探索和研究具有一定的参考价值。     

大型45铸钢齿轮专用耐磨堆焊焊条的研制

根据矿山机械、水泥机械等大型齿轮磨损堆焊性能的要求，有针对性的研制出了具有耐冲击、金属间接触疲劳磨损的堆焊焊条。这种焊条的堆焊层组织是奥氏体基体上分布着碳化物、硼化物硬质相，有较高的塑韧性和加工硬化效应，它既有高抗裂性，又有良好的耐磨性，工艺性也优良，是一种应用范围较大的新型耐磨堆焊材料，该种焊条用于直径等大型齿轮（４５铸钢件）表面堆焊后的实际运转考核中表明：齿轮运转正常，耐磨性能良好，经济效益高。     

最大熵谱估计的算法研究

对最大熵谱估计的几种算法进行了分析和比较，并简要介绍了最大熵谱估计技术的发展前景。     

饲用肌醇在鳗鱼饲料中的应用效果评价试验

本文通过比较药用肌醇与饲用肌醇添加在鳗鱼饲料中的喂养试验，结果表明在鳗鱼饲料中，添加饲用肌醇有促进鳗鱼生长作用。并对鳗鱼饲料中添加肌醇量作初步探讨。     

略论房地产开发经营中的风险和收益

本文通过对房地产商品特殊性的分析，论述房地产投资开发经营中的风险和收益，并掌握两者的相互关系，拟定对策，力避风险并获得最件收益     

“V”型牵伸在A513A细纱机上的应用

本文利用“Ｖ”型牵伸装置对Ａ５１３Ａ细纱机牵伸装置进行了改造。并通过优化工艺参数，得出了一些结论，对改造细纱机牵伸装置提供了参考依据。     

压电喷射点胶阀的喷射性能分析及实验研究

利用压电叠堆具有较好的响应特性和输出特性的特点,提出了一种新型压电驱动式喷射点胶阀.该喷射点胶阀主要由压电叠堆、杠杆式微位移放大机构、阀杆和喷嘴组成.对胶液实现喷射的条件进行了理论分析,并利用ANSYS软件对喷嘴重胶液流场进行仿真,得到了阀杆位移、胶液黏度和驱动气压对喷射点胶的影响规律,最后通过实验验证了理论分析和仿真的正确性.当胶液的黏度为2Pa·s时,获得的胶点最小直径为0.5mm,胶点一致性误差在6％以内.为电子封装业提供了更加高效和准确的点胶方法.     

Effect of dy on structure and magnetic properties of CoPt alloys

The effects of Dy on the microstructure and magnetic properties of Dy _x Co_50?x Pt₅₀ alloys were investigated. The XRD results indicate that all the alloys homogenized at 1000 °C contain only a single A1 (fcc) phase, while the alloys annealed at 675 °C consist of a hard-magnetic face-centered-tetragonal (fct) phase and a magnetically soft face-centered-cube (fcc) phase. Maximum values for the coercivity H _c and remanence ratio m _r were achieved in Dy_0.4Co_49.6Pt₅₀ alloys annealed at 675 °C for 80 min. For the series of Dy _x Co_50?x Pt₅₀ alloys annealed at 675 °C for 60 min, H _c decreases monotonically with increasing Dy concentration, but m _r is first enhanced and then weakened.     

钢筋混凝土梁修补技术对其钢筋锈蚀性能的影响

采用了6种修补材料及其配套方法对已经受弯损伤的钢筋混凝土梁进行了修补,基于线性极化法评价了修补后构件在5%硫酸镁溶液中钢筋的锈蚀情况。结果表明:不同的修补材料及其配套方法,对修补后构件的钢筋锈蚀性能影响显著。其中,采用水泥基修补砂浆结合锌丝的牺牲阳极保护方法提高构件的抗锈蚀效果最为明显。而且极化电阻和锈蚀电流密度之间存在明显的指数关系,得到了极化电阻和锈蚀电流密度之间的关系式。     

Tribological and economic evaluation of recycled mineral lubricating oils

Seven kinds of used mineral lubricating oils, including hydraulic oils, film bearing oils, steam turbine oil and gear oils, were recycled by reclamation and adding additives. Physical and chemical properties of the recycled oils were measured and their lubrication performances were evaluated by the original and modified four-ball testers. Worn surfaces were analyzed by energy dispersive X-ray spectroscopy and Raman microscope. The recycling costs of burning, re-refined and refortified were estimated. Results showed that physical and chemical properties of the refortified oils were improved effectively and became in the industrial access standard. With the different friction materials under different loads, refortified oils provided excellent lubrication performances, much better than those of fresh oils. Because of additives replenished, the different lubrication films could form on the worn surfaces. A rough financial calculation revealed that the refortification process could produce the most economic value among the three methods.