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石英晶体微平衡法测定CO_2在聚合物中的溶解度 被引量:1
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作者 王邵雷 彭昌军 +3 位作者 李鲲 王吉超 史济斌 刘洪来 《化工学报》 EI CAS CSCD 北大核心 2003年第2期141-146,共6页
将石英晶体微平衡法 (QCM )用于气体在聚合物中溶解度的测定 ,实测的CO2 在尼龙 66、天然橡胶和聚氯乙烯中的溶解度与文献值符合较好 .测定了CO2 在聚苯乙烯、聚甲基丙烯酸甲酯和聚甲基丙烯酸正丁酯 3种均聚物及苯乙烯 甲基丙烯酸甲酯... 将石英晶体微平衡法 (QCM )用于气体在聚合物中溶解度的测定 ,实测的CO2 在尼龙 66、天然橡胶和聚氯乙烯中的溶解度与文献值符合较好 .测定了CO2 在聚苯乙烯、聚甲基丙烯酸甲酯和聚甲基丙烯酸正丁酯 3种均聚物及苯乙烯 甲基丙烯酸甲酯共聚物、苯乙烯 丁二烯 苯乙烯共聚物、甲基丙烯酸正丁酯 甲基丙烯酸二甲基氨基乙酯共聚物和甲基丙烯酸正丁酯 丙烯酸全氟烷基乙基酯共聚物等嵌段共聚物中的溶解度 ,并用链状流体状态方程对实验数据进行了关联 。 展开更多
关键词 石英晶体微平衡法 测定 CO2 聚合物 溶解度 气体 状态方程 二氧化碳 膜分离
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压电晶体微平衡法测定溶剂在高分子中的扩散系数
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作者 邹斌 史济斌 +2 位作者 虞大红 刘洪来 胡英 《华东理工大学学报(自然科学版)》 CAS CSCD 北大核心 1999年第4期405-409,共5页
建立了应用压电晶体微平衡法测定溶剂在高分子中的吸收动力学曲线的实验装置,测定了298~313K范围内乙酸乙酯和丁酮在聚苯乙烯、聚甲基丙烯酸甲酯、聚酞酸二烯丙酯三种高分子中的吸收曲线,并获得了溶剂的平均扩散系数和平衡溶... 建立了应用压电晶体微平衡法测定溶剂在高分子中的吸收动力学曲线的实验装置,测定了298~313K范围内乙酸乙酯和丁酮在聚苯乙烯、聚甲基丙烯酸甲酯、聚酞酸二烯丙酯三种高分子中的吸收曲线,并获得了溶剂的平均扩散系数和平衡溶解度。用溶剂在玻璃态高分子膜中的传递模型对所得吸收曲线进行了关联,对S型吸收曲线取得令人满意的关联效果,但该模型不适用于双平衡型吸收曲线的关联。 展开更多
关键词 扩散系统 压电晶体 高分子 溶剂 微平衡法
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相平衡和径向分布函数(Ⅱ)——计算径向分布函数的微相平衡法 被引量:2
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作者 陈光进 吴锦元 余国琮 《化工学报》 EI CAS CSCD 北大核心 1995年第4期398-402,共5页
在本文(Ⅰ)报中提出的双阻力模型和质量通量准则的基础上,通过考虑任一微相和无序空间的相平衡,将径向分布函数用局部俘获率和局部位能解析性地表达出来,并解决了局部俘获率和局部位能的计算问题。由于计算公式的解析性,本文的计算速度... 在本文(Ⅰ)报中提出的双阻力模型和质量通量准则的基础上,通过考虑任一微相和无序空间的相平衡,将径向分布函数用局部俘获率和局部位能解析性地表达出来,并解决了局部俘获率和局部位能的计算问题。由于计算公式的解析性,本文的计算速度远远高于分子模拟和积分方程理论。计算结果与分子模拟的结果吻合良好,在第1峰附近,优于积分方程的结果。 展开更多
关键词 径向分布函数 平衡 平衡
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溶剂小分子在嵌段高分子膜中传递性质的研究
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作者 粟常红 张温福 +1 位作者 史济斌 刘洪来 《化学世界》 CAS CSCD 北大核心 2001年第9期466-469,共4页
通过压电晶体微平衡法 (QCM法 )获得了乙醇、甲苯在由聚乙酸乙烯酯和聚甲基丙烯酸酯组成的嵌段共聚物中扩散的实验曲线 ,在由 Voigt蠕变模型和 Flory- Huggins混合模型建立的传递模型基础上 ,通过吸入吸附对扩散的影响 ,得到改进的传递... 通过压电晶体微平衡法 (QCM法 )获得了乙醇、甲苯在由聚乙酸乙烯酯和聚甲基丙烯酸酯组成的嵌段共聚物中扩散的实验曲线 ,在由 Voigt蠕变模型和 Flory- Huggins混合模型建立的传递模型基础上 ,通过吸入吸附对扩散的影响 ,得到改进的传递模型 ,用以关联实验曲线 ,结果吻合良好。 展开更多
关键词 表面吸附 扩散模型 嵌段高分子膜 压电晶体微平衡法 溶剂小分子 扩散系数
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Optimal estimation of zonal velocity and transport through Luzon Strait using variational data assimilation technique 被引量:7
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作者 兰健 鲍献文 高郭平 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2004年第4期335-339,共5页
A P-vector method was optimized using variational data assimilation technique, with which the vertical structures and seasonal variations of zonal velocities and transports were investigated. The results showed that w... A P-vector method was optimized using variational data assimilation technique, with which the vertical structures and seasonal variations of zonal velocities and transports were investigated. The results showed that westward and eastward flowes occur in the Luzon Strait in the same period in a year. However the net volume transport is westward. In the upper level (0m -500m),the westward flow exits in the middle and south of the Luzon Strait, and the eastward flow exits in the north. There are two centers of westward flow and one center of eastward flow. In the middle of the Luzon Strait, westward and eastward flowes appear alternately in vertical direction. The westward flow strengthens in winter and weakens in summer. The net volume transport is strong in winter (5.53 Sv) but weak in summer (0.29 Sv). Except in summer, the volume transport in the upper level accounts for more than half of the total volume transport (0m bottom). In summer, the net volume transport in the upper level is eastward (1.01 Sv), but westward underneath. 展开更多
关键词 South China Sea Luzon Strait zonal velocity and transport variational data assimilation technique
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Forced Resonance of a Slightly-Curved Hydraulic Pipe Fixed at Two Ends
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作者 MAO Xiaoye XIAO Lu +1 位作者 DING Hu CHEN Liqun 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2022年第3期271-279,共9页
The ideally straight hydraulic pipe is inexistent in reality. The initial curve caused by the manufacturing or the creep deformation during the service life will change the dynamic character of the system. The current... The ideally straight hydraulic pipe is inexistent in reality. The initial curve caused by the manufacturing or the creep deformation during the service life will change the dynamic character of the system. The current work discusses the effect of the initial curve on the hydraulic pipe fixed at two ends for the first time. Based on the governing equation obtained via the generalized Hamilton’s principle,the potential energy changing with the height of the initial curve is discussed. The initial curve makes the potential energy curve asymmetric,but the system is always monostable. The initial curve also has very important influence on natural frequencies. It hardens the stiffness of the first natural mode at first and then has no effect on this mode after a critical value. On the contrast,the second natural frequency is constant before the critical value but increases while the height of the initial curve exceeds the critical value. On account of the initial value,the quadratic nonlinearity appears in the system. Forced resonance is very different from that of the ideally straight pipe under the same condition. Although the 2∶1 internal resonance is established by adjusting the height of the initial curve and the fluid speed,the typical double-jumping phenomenon does not occur under the initial curve given in the current work. This is very different from the straight pipe in the supercritical region. The work here claims that the initial curve of the hydraulic pipe should be taken into consideration. Besides,more arduous work is needed to reveal the dynamic characters of it. 展开更多
关键词 forced resonance hydraulic pipe slightly-curved pipe harmonic balance method
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The effect of surface anisotropy on contact angles and the characterization of elliptical cap droplets 被引量:2
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作者 WANG ZhanLong CHEN EnHui ZHAO YaPu 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2018年第2期309-316,共8页
In this paper, the variation of contact angles of a droplet on grooved surfaces was studied from microscale to macroscale experimentally and theoretically. The experimental results indicated that the contact angle cha... In this paper, the variation of contact angles of a droplet on grooved surfaces was studied from microscale to macroscale experimentally and theoretically. The experimental results indicated that the contact angle changes nonlinearly with anisotropic factor. To get clear of the changing process of contact angle on grooved surfaces from microscale to macroscale, we carried out theoretical analysis with moment equilibrium method being adopted. In addition, the variation of contact angles in different directions was investigated and a mathematic model to calculate arbitrary contact angles around the elliptic contact line was suggested. For the convenience of potential applications, a symbolic contact angle was proposed to characterize the ellipsoidal cap droplet on grooved surfaces. Our results will offer help to the future design of patterned surfaces in practical applications,and deepen the understanding of wetting behavior on grooved surfaces. 展开更多
关键词 DROPLET contact angle ELLIPSE contact line grooved surface
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Axisymmetric 3:1 internal resonance of thin-walled hyperelastic cylindrical shells under both axial and radial excitations
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作者 Jia Jiao Jie Xu +1 位作者 Xuegang Yuan Li-Qun Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第8期122-131,共10页
Nonlinear vibration with axisymmetric 3:1 internal resonance is investigated for an incompressible neo-Hookean hyperelastic cylindrical shell under both axial and radial harmonic excitations.A full nonlinear strain-di... Nonlinear vibration with axisymmetric 3:1 internal resonance is investigated for an incompressible neo-Hookean hyperelastic cylindrical shell under both axial and radial harmonic excitations.A full nonlinear strain-displacement relation is derived from the large deflection theory of thin-walled shells.A set of nonlinear differential equations describing the large deflection vibration are formulated by the Lagrange equation and the assumption of small strains.Steady-state responses of the system are predicted via the harmonic balance method with the arc length continuation,and their stabilities are determined via the modified sorting method.The effects of excitations on the steady-state responses are analyzed.The results reveal a crucial role played by the phase difference in the structural response,and the phase difference can effectively control the amplitude of vibration. 展开更多
关键词 Thin-walled cylindrical shell Incompressible neo-Hookean material Internal resonance Harmonic balance method with the arc length continuation
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