等离子硅刻蚀及其工艺参数的多尺度优化

用CFD-ACE+和CFD-TOPO分别对容性耦合等离子体反应腔室放电和等离子硅刻蚀过程进行仿真,讨论不同射频电压和腔室条件对等离子体特性的影响.结果表明:随着射频电压的升高,离子的通量增大;在低射频电压时,离子通量随腔室压强的升高而减小,而在高射频电压时趋势则相反.用Kriging模型对影响刻蚀形貌的参数(腔室压强和射频电压)进行优化,结果表明该优化方法可以为工艺条件相近的刻蚀机设备的设计提供参考.     

海洋非黏结柔性管道接头密封结构分析

介绍海洋非黏结柔性管道接头的常见密封结构,用Abaqus对接头的密封特性进行数值分析,研究密封圈的密封性能对不同密封结构参数的灵敏度,得到密封结构参数变化对接头密封结构的密封性能和力学性能影响的一般规律.结果表明密封结构的主要设计参数为密封圈的锥角和曲率半径以及加载位移等.     

基于材料非线性的海洋柔性立管防弯器有限元分析

建立海洋柔性立管防弯器三维有限元模型,研究聚氨酯材料非线性对防弯器弯曲性能的影响．通过算例对比不同材料属性的计算结果,发现不考虑材料非线性的计算结果与理论分析结果吻合较好．试验结果表明考虑防弯器材料非线性的立管最大曲率比不考虑材料非线性的小10％．因此,在防弯器详细分析时很有必要考虑材料非线性．     

空中动态悬跨缆设计及极值疲劳分析

从工程实际问题出发,利用实测资料,对渤海上的一个连接FPSO与固定导管架平台的动态悬跨缆进行基本的线型设计.借助Orcaflex软件对动态缆响应进行非线性时域分析,在不同海况下对动态缆进行极值分析和疲劳分析,进而对其进行安全评估,指出管缆的危险区域.结果对类似的悬跨缆设计、分析以及对其危险区域的保护等工作有实际参考意义.     

浅析呼和浩特市大气SO2发展趋势及防治对策

本文通过对二氧化硫的形成及危害的阐述，以及对我市近几年大气中二氧化硫监测结果的分析，针对发展趋势和存在的问题，根据实际情况提出相应的建议。     

Soap‐free emulsion copolymerization of perfluoroalkyl acrylates in the presence of a reactive surfactant

Soap‐free emulsion copolymerization of perfluoroalkyl acrylate (FA)/methyl methacrylate (MMA)/n‐butyl acrylate (n‐BA) was carried out in the presence of sodium 2‐acrylamide‐2‐methyl propanesulfonate (AMPSNa) as a reactive surfactant and potassium persulfate (KPS) as an initiator. An analysis of the effects of concentration of AMPSNa, KPS, FA as well as polymerization temperature on the kinetic features (rate of polymerization) and colloidal characteristics (mean particle diameter, particle disperse index, particle numbers, and surface charge density) was followed. NMR, FTIR, AFM, and fluorine‐selective electrode analysis were used to characterize the composition and morphology of the FA copolymers. Both AFM analysis and contact angle measurements strongly implied that the fluorinated segments migrated to the outmost surface and created films with lower surface energy. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 2438–2444, 2007     

Anisotropically ordered liquid crystalline epoxy network on carbon fiber surface

Summary Anisotropic orientation of liquid crystalline epoxy(LCE) resin on carbon fiber(CF) surface was investigated and it was correlated with curing behavior and thermomechanical properties of LCE. Anisotropic orientation of a LCE resin was spontaneously induced on CF surface along a long molecular axis of CF during curing and the anisotropic orientation was maintained after curing. Curing of LCE was accelerated by alignment of LCE on CF and anisotropic orientation of LCE enhanced dynamic modulus of CF reinforced LCE composites.     

蒸汽夹套管设计中需注意的几个问题

在石油、化工生产中 ,蒸汽夹套管作为保温管道类型之一常常在实际生产广泛运用。针对蒸汽夹套管在设计、安装中经常忽视的一些问题 ,分别从不同侧面加以比较分析 ,概括出它们在不同工况下的共同特点。在实际生产中 ,可有效提高管道运行的可靠性 ,降低投资     

Universal yield stress function for biocompatible chitosan based-electrorheological fluid: Effect of particle concentration

Electrorheological (ER) response of biocompatible particles suspended in an insulating silicone oil, was investigated under several different applied external electric field strengths. Chitosan, a biodegradable polysaccharide, was used as anhydrous ER materials. The effect of particle volume concentration on their ER response was examined by focusing on the measurement for rheological and electrical properties. The yield stress of chitosan suspended in silicone oil system as a function of applied electric field strength showed different value of slopes for different particle concentrations, however, all data points collapse onto a universal scaling function.     

Grafting poly(t‐butyl acrylate) to poly(allylamine) by inverse microemulsion radical polymerization: From comb‐polymer to amphiphilic shell crosslinked polymer nanocapsule

An interfacial grafting radical polymerization method for amphiphilic comb copolymer and shell crosslinked polymer nanocapsules was reported. Macropolyradicals on a water soluble long chain polyamine were generated with hydrogen peroxide in the water phase and subsequent grafting radical polymerization of a vinylic monomer at the water/oil interface proceeded at 65°C. In the presence of a crosslinker, the resulting graft copolymer formed a defined core‐shell structure with hydrophilic aqueous core functionalized by the polyamine and a hydrophobic crosslinked polymer shell. The structure of the core‐shell material was characterized by NMR, FTIR, DSC, TGA, SEM, TEM, and the mechanism of the graft polymerization is proposed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1905–1911, 2007