倾斜转子-滑动轴承系统周期解稳定性研究

摘　要：针对倾斜转子-滑动轴承系统的周期解稳定性问题,考虑倾斜状态下滑动轴承径向载荷的变化,基于有限元法建立了系统的动力学方程。使用Newmark方法仿真得到了倾斜转子-轴承系统的动力学响应,并分析了倾斜角度变化对转子周期解失稳阈速和失稳区宽度的影响。仿真结果表明,转子倾斜角度增大会导致转子失稳阈速减小,失稳宽度增大,但对周期解失稳区域上边界影响不大。倾斜转子的升速实验验证了仿真结果。     

Quantitative Analysis of Components in OC-CS Sprays by High Performance Liquid Chromatography with Double Wavelength UV Detection

The method of reversed-phase high performance liquid chromatography was established for the determination of effective components in OC-CS spray using double wavelength UV detection.The method was utilized under following conditions:a column of Kromasil C18(250 mm × 4.6 mm,5 μm),mobile phase consisting of methanol/water(80 /20) at a flow rate of 0.8 mL/min,column temperature of 25 ℃,and the UV detection at 227 nm and 300 nm.Three key components in OC-CS spray could be distinguished clearly,including o-chlor...     

加强高等学校实验室安全管理的几点思考

本文阐述了在高等学校实验室安全管理中存在的四个问题,并且针对每个问题提出了相应的解决方案.开设实验室安全教育选修课,有针对性地设计课程内容,将是普及实验室安全知识的有效途径;实验室管理制度的完善是解决问题的重要基础;安全预案的制定与安全演习的实施是实现实验室安全管理的重要手段;建立实验室安全准入制度是实验室安全管理的重要保证.     

Nano-silica particles enhanced adsorption and recognition of lysozyme on imprinted polymers gels

Molecular imprinting technology has a great potential to be used in protein separation and purification.In this work,lysozyme imprinted polyacrylamide gel was prepared with silica particles as a sacrificial template to generate macro-porosity for fast adsorption.The adsorption equilibrium time and adsorption capacity were 9 h and 56 mg/g respectively,which was 2 h less and 2.3-fold more than polymers without the sacrificial template.In order to test molecular imprinting polymers(MIPs)'selectivity,bovine serum albumin(BSA)was chosen as interferent for binary adsorption tests.In addition,the adsorption selectivity was further investigated using different molar ratios of lysozyme to BSA with fixed total concentration of proteins,as well as using various total concentrations of proteins with an equimolar ratio of lysozyme to BSA.It has been proven that the total concentration of proteins should be larger than1.5×10~(-7) mol/mL,when the molar ratio of BSA to Lyz is 1∶1,in order to effectively separate Lyz from the binary protein mixture.The macro-porous lysozyme molecularly imprinted polymers have less adsorption time,larger adsorption capacity,and better imprinting effect.