泵引起的液压系统振动分析

通过液压系统产生振动和噪音的振源及振动量传递的分析,开发了测定泵的振源特性的新方法,－２压力／２系统”法,介绍了用阻抗求解管内压力脉动的方法及通用仿真程序包,实验表明,仿真结果与实测结果一致。     

常压射流等离子体处理PET膜诱导自由基研究

为了考察常压射流等离子体(APPJ)处理对PET膜表面诱导自由基及其引发接枝共聚反应的效能,采用电子自旋共振技术(ESR)对APPJ处理前后PET膜表面生成的自由基及其衰变行为进行测试分析,并与接枝率测试结果进行对比。结果表明:纯He气体的APPJ处理更易引发PET膜表面生成自由基,处理时间越长,膜表面自由基浓度越高,自由基产物的稳定性受存储条件影响显著,自由基浓度越高的样品对应的接枝率也越高。     

合肥地区高校安居园工程可行性研究

文章针对合肥地区高校教师住房面积普遍偏小,尤其是中青年教师住房十分困难。经过对合肥地区高等院校教师现有住房情况的调研,提出了建造高等院校教师安居园工程的设想及实施方案,对实施“科教兴皖”的战略方针具有现实意义。     

贫困地区如何发展农业产业化（一）

山西省是全国主要的贫困省份之一。实施主导产业覆盖贫困乡村战略,搞农业产业化开发是山西省脱贫的有效途径。文章论述了贫困地区发展农业产业化的必要性及其难点,提出了贫困地区发展农业产业化的对策     

单模光纤的偏振特性分析

本文分析了性能不完善的单模光纤产生偏振特性的机理,并解释了偏振特性引起的几种物理现象,论证了性能完善的单模光纤不存在偏振特性。     

Stability of the Sarcin/Ricin domain of 28S RNA in rat ribosome under hydrostatic pressure

Under 2 100 bar of hydrostatic pressure, KNA N-glycosidase can still cleave the N-C bond of adenosine at position 4324 in R/S domain of 28S RNA in rat ribosome, demonstrating that high pressure has no effect on the tertiary structure of S/R domain.     

Diamond synthesis from a system of chromium-carbide and Ni70Mn25Co5 alloy

In order to ascertain the mechanism of interaction between carbide and metallic catalyst and formation of diamond under high pressure and high temperature, and find a new method to synthesize diamond with special properties, it is necessary to investigate the reaction behavior of different carbides and metallic solvent_catalysts under high pressure and high temperature. A system of Cr-3C-2 powder and Ni 70Mn 25Co 5 alloy in weight ratio of 1∶6 was treated under 6 0 GPa and 1 500℃ for 20, 30 or 60 min respectively. X_ray diffraction of the samples indicated the Cr 3C 2 decomposed partially after high pressure and temperature treatment, and Cr 7C 3, Cr and diamond formed respectively. There was not any trace of graphite in the samples. The result suggested that the separated carbon atoms could form diamond directly without conversion process of graphite into diamond. The observation of SEI, WDX and EDX also showed that diamond crystals were synthesized in the system, which have perfect surfaces and shapes, with the average grain size of about 40 μm. The properties of the crystals are being investigated.     

双剪强度理论在水工压力隧洞弹塑性应力分析中的应用

水工压力隧洞的弹塑性分析,工程上一直采用Ｍｏｈｒ－Ｃｏｕｌｏｍｂ强度准则进行求解。但由于该理论和试验结果常常不符,故产生误差。本文应用俞茂宏教授提出的双剪强度理论对水工压力隧洞进行弹塑性分析,解决了上述问题。     

影响油气运移的应力场地温场渗流场耦合的双重介质模型

地应力场、地温场和渗流场是影响油气运移的主要因素。以此为基础,研究了含油气盆地双重介质体系内流体与岩体相互的力学作用关系,提出了双重介质体系内渗流场、岩体地应力场和地温场耦合的非线性动力学模型。