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Density functional theory is applied to predicting the structures and electrostatic potentials of planar electrochemical surfaces within the framework of the restricted primitive model where small ions are represented by charged hard spheres of equal diameter and the solvent is assumed to be a continuous dielectric medium. The hard-sphere contribution to the excess Helmholtz energy functional is evaluated using the modified fundamental-measure theory and the electrostatic contribution is obtained from the quadratic functional Taylor expansion using the second-order direct correlation function from the mean-spherical approximation. Numerical results for the ionic density profiles and the mean electrostatic potentials near a planar surface of various charge densities are in excellent 相似文献
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主要描述了全透明高压相平衡池。该池全部用人造蓝宝石制造,其最大工作压力为50MPa,工作温度为20—200℃。应用该装置,可以目测混合物的相态变化和测定 P-V-T 关系。本文还就 CH_4-C_(16)H_(34)二元体系汽液相界的测定具体阐明其应用。 相似文献
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Density functional theory is applied to predicting the structures and electrostatic potentials of planar electrochemical surfaces within the framework of the restricted primitive model where small ions are represented by charged hard spheres of equal diameter and the solvent is assumed to be a continuous dielectric medium. The hard-sphere contribution to the excess Helmholtz energy functional is evaluated using the modified fundamentalmeasure theory and the electrostatic contribution is obtained from the quadratic functional Taylor expansion using the second-order direct correlation function from the mean-spherical approximation. Numerical results for the ionic density profiles and the mean electrostatic potentials near a planar surface of various charge densities are in excellent agreement with molecular simulations. In contrast to the modified Gouy-Chapman theory, the present density functional theory correctly predicts the second layer formation and charge inversion of charged surfaces as observed in simulations and in experiments. The theory has also been tested with the zeta potentials of positively charged polystyrene particles in aqueous solutions of KBr. Good agreement is achieved between the calculated and experimental results. 相似文献
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用百分表测金属丝的杨氏弹性模量 总被引:1,自引:0,他引:1
简要介绍了用百分表测钢丝杨氏弹性模量的原理及方法,同时阐明了此方法的主要优点,并将此法的测量结果与传统测量光杠杆法的结果作了进一步比较 。 相似文献
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含醇体系的汽相由于分子缔合从而引起组份的汽相逸度系数偏离1较大,故对汽相非理想性的校正是不容忽视的。本文论述了应用“分子聚集理论”对正烷烃—伯醇混合物的汽相进行非理想校正的计算方法;汽相应用“分子聚集理论”改进的维里方程,而液相采用UNIQUAC活度系数方程。通过对含伯醇的混合物体系的汽液平衡进行计算,取得了好的结果。 相似文献
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三峡枢纽工程机电设计涉及面广、技术难度高。三峡工程机电科研工作有针对性地根据不同设计阶段和工程实际需要,同时结合国家“八·五”、“九·五”重大科技攻关项目展开,对涉及枢纽工程机电设计项目进行一系列重点研究。长江委作为工程的设计单位与高等院校、科研院所和制造厂商广泛协作,开展了包括水系统特殊设备、接地技术及过电压、励磁系统设备、调速器系统设备、继电保护设备、电站自动控制设备、升船机与船闸自动控制及检测设备、通信系统等关键技术设备的研制。其主要研究成果不仅为优化技术方案提供了理论基础和应用依据,而且加快了产品研制的进程,提高了国产化程度。在科研合作方式上,借鉴以往的经验利弊,探索了一条以工程设计单位牵头总体负责,相关机构紧密联合的方式,使科研成果能直接应用于工程设计。数十项重大机电科研攻关成果的应用,为大型水电工程设计与工程实施提供了成功的经验。 相似文献
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我厂1986年从意大利凡尔利西那公司引进的3台紧凑型年产2000吨涤纶丝机,其主机卷绕头槽筒和摩擦辊驱动所用的电机为西门子SIMOVERT-V型变频机,我们在整理技术资料过程中,得知该机所用的 相似文献