机床主轴部件刚度的一种精确的计算方法

将初参数法与优化方法相结合，提出了阶梯主轴部件刚度的计算方法．这一方法很适合在计算机上对多支承主轴的刚度作精确计算．     

活度标准态选择的图解法

将以拉乌尔定律和享利定律为基础的各种标准态选择，用图解的形式概括，使极其复杂的标准态选择成为一目了然的图解     

轴流风机不平衡故障诊断与平衡技术应用研究

探讨了轴流风机不平衡故障诊断与平衡技术的应用研究,通过对现场3#机轴系振动的治理,揭示了导致3#机组振动的主要原因是汽轮机转子存在较大的两阶不平衡分量,通过对汽轮机转子施加反对称分量将轴流风机轴系振动处理达到振动优良等级.     

Preparation of AZ91D Slurries for Semi-Solid Forming Using Al8 ( Mn, Fe) 5 Precipitates

During the solidification of the AZ91D-alloys, the Al8(Mn, Fe)5 phase is generally precipitated in the melt in advance of the precipitation of the primary α-Mg. The basic principle for manufacturing AZ91D-alloy slurries for semi solid forming is to use the Al8(Mn, Fe)5 precipitates as the heterogeneous nucleation sites for primary α-Mg phases. Microscopic analysis for the location of the Al8(Mn, Fe)5 precipitate explains that the Al8(Mn, Fe)5 precipitate is the effective heterogeneous nucleation site for the primary α-Mg phase. It was also observed that increase of the Mn content in the melt and the cooling rate below to the solid/liquid two-phase region resulted in smaller and more globular primary α-Mg due to the increase of heterogeneous nucleation sites. It was found that the average α-Mg diameter grew as a function of t0.278, where t is the holding time at the solid/liquid two-phase region. This would be attributed to the Ostwald type ripening and coalescence between primary α-Mg phases. The cooling rate below to the solid/liquid two-phase region, Mn content in AZ91D alloy, and the holding time and temperature affected on the quality of slurry.     

典型脱硫工艺在火电厂的应用探讨

我国电力生产的水电为主,在全国发电量中火电占80%左右,而火电中90%为燃煤机组,燃煤电厂是污染大户,是酸雨及二氧化硫污染的主要来源之一.随着我国政府对酸雨及二氧化硫污染控制的高度重视,火电厂二氧化硫最高允许排放浓度和两控区内火电厂二氧化硫总量控制标准的实施.     

带屏蔽的多平行微带线分析公式及其应用

本文利用带状线的电容分布特点给出了带屏蔽的多平行耦合微带线的分布电容模拟分析公式,并采用Weeks给出的超松弛差分数值计算方法进行了验算,误差不超过2％。最后,给出了本公式的两个应用实例,实验结果表明,效果令人满意。     

L-Fuzzy拓扑空间中的半内部、半闭包、半边界、半正则性质

在Ｌ－Ｆｕｚｚｙ拓扑空间中给出了半内部、半闭包、半边界和半正则的定义，讨论了它们的性质，并借助于它们给出了半开集、半闭集、正则开（闭）集的等价刻划．     

Effect of deteriorated microstructures on stress corrosion cracking of X70 pipeline steel in acidic soil environment

In order to investigate stress corrosion cracking (SCC) of X70 pipeline steel and its weld joint area in acidic soil environ-ment in China, two simulating methods were used: one was to obtain bad microstructures in heat affected zone by annealing at 1300°C for 10 min and then, quenching in water; the other was to get different simulating solutions of acidic soil in Yingtan in south-east China. The SCC susceptibilities of X70 pipeline steel before and after quenching in the simulating solutions were analyzed...     

NOET合成方法的改进及其99Tcm标记

本工作主要在ＮＯＥＴ的合成方面做了一些改进,制备出纯度高,稳定性较好的ＮＯＥＴ的钾盐,并探讨了影响＾９９Ｔｃ＾ｍＮ－ＮＯＥＴ标记率的相关因素,由此得出最佳标记条件。在此条件下,＾９９Ｔｃ＾ｍＮ－ＮＯＥＴ的标记率可稳定在９０％以上。