Vapor-liquid equilibrium simulation of binary and ternary mixtures of CH4, C2H4 and iso-C4H10

The vapor-liquid equilibrium（VLE） properties for the binary and ternary mixtures of CH4,C2H4 and isoC4H10 are of great importance in the recovery of ethylene from mixture containing CH4 and C2H4 with iso-C4H10 as solvent.Hence,Gibbs ensemble Monte Carlo（GEMC） simulations were used to estimate vapor-liquid equilibrium for the binary and ternary mixtures of CH4,C2H4 and iso-C4H10 with the united atom potential NERD model.The selected simulation conditions are based on the experiment in the literature.The results of this work were shown to be in satisfactory agreement with available experimental data and predictions of Peng-Robinson equation of state.The structure of simulated liquid phase is also characterized by radial distribution function（RDF）,which contributes to further understanding of the VLE curve of these systems.RDF is not sensitive to the pressure and temperature range.With the increase of pressure or the decrease of temperature,the molecules tend to gather together.     

Numerical simulation on floating behavior of buoyancy tank foundation of anemometer tower

The intact stability and damage stability of a model of an anemometer tower with buoyancy tank foundation are computed by the finite element software MOSES in this paper. The natural period of the anemometer tower is discussed through frequency domain analysis. The influence of a single factor, such as towing point position, wave height, wave direction and wave period, on towing stability is discussed through time domain analysis. At the same time, the towing stability under the condition of various combinations of many factors is analyzed based on the meas- ured data of the target area. Computer simulation results show that the intact stability is preferable and the damage stability is sufficient under the condition of plenty of subdivisions. Within the scope of the buoyancy tank foundation, the higher the towing point position is, the better the stability is. Wave height has a great impact on the motion amplitude of buoyancy tank foundation, but the effect on the acceleration is not obvious; wave period has a great impact on the acceleration, while the effect on the motion amplitude is not obvious; following-waves towing is more conducive to safety than atry.     

两位2014年辽宁高考作文阅卷教师模拟还原高考作文阅评现场——高考阅卷教师眼中的高分作文

孔子所言“七十而从心所欲不逾矩”乃是阅尽世事千般才达到的境界。在规矩的框架内,亦是自由随心。事实上,墨守规则,亦为人所应遵守的大道。独木桥上的打破常规,看似合作共赢,实则后患无穷：倘若所有的选手都作如是的选择,皆成功渡过要如何评定最终的胜负结果？     

CFD simulation of micro-particle trapping under water tweezers

In early research, capture and manipulation of particles were mainly achieved by means of light, electricity and plasma in micro-fabficaton and micro-assembly. A new method is proposed using micro-water jet to form water tweezers to capture solid particles and implement position control of micro-particles. This paper analyzes the basic prin- ciple of water tweezers, and the discrete element method and smoothed particle hydrodynamics method are employed to establish a solid-liquid coupling model used in analyzing the trapping mechanism. A flow field model is set up to simulate dynamic characteristic of water tweezers based on computa- tional fluid dynamics （CFD）. Selection of boundary conditions, initial guess, solver control and convergence strategies of the model are discussed. Velocity and pressure of streamline are predicted and discussed under certain input conditions. Simu- lation results demonstrate that it is an efficiently theoretical method to eventually trap solid particles by water tweezers.     

Virtual simulation of production line for ergonomics evaluation

To avoid ergonomic problems in the early planning stages of a production line and achieve more satisfactory planning and design, ergonomic simulation is particularly important in digital production line planning. An ergonomics analysis method is presented by using two theories： Ovako working posture analysis system （OWAS） and Burandt-Schultetus hand-arm force analysis （BSHA）. The processes of ergonomics analysis and simulation are discussed based on a platform of process simulation and process designer. As an example, the paper shows how ergonomics problems are considered in production line planning to make a better choice between different production line planning schemes.     

“笨”学生成长记

<正>带现在的班级有一段时间了,我经常能察觉到孩子们在平时的学习或者活动中表现出来的种种不自信。在他们看来,学习上的失败是一直贴在他们身上的标签,而考试成绩也是证明他们存在价值和发展方向的唯一指标。这一想法在一段时间内根深蒂固,从而让他们不能正确地评价自己,也不敢在各种活动中发挥自己的优势。萍就是这样的一个孩子。她的确不擅长学习,进校时,她的分数排在班级末尾。原本想着进入职校后能从零学起,改变学习上的颓势,但是面对市场营销专业需     

“虚实结合”开展与市场接轨的岗位综合实训

以企业实践为教材,利用物流市场信息和免费"教师"资源,"虚实结合"构建工作情景,模拟企业运作流程和业务操作,开展与物流市场接轨的职业岗位(群)综合实训,为物流操作型、综合型人才培养开辟了一条有效途径。阐述了综合实训与市场接轨的意义,并分析了综合实训组织和实施中的关键控制要素。     

初中平面几何情境教学例析

正一、初中平面几何情景高效教学探索的必要性情景教学,通俗地讲就是形象化教学,把抽象、难懂的数学问题,通过多媒体,模型模块和图形图片以及实际操作展现出来,通过发散和联想与基础数学解答结合,让学生走进来容易走出去也容易,简单易懂地掌握初中几何要求的教学内容。二、初中平面几何情景教学探索模拟实践(一)图形视觉形象化识别教师在讲授图形的概念和识别时,有时候拿出一个特定的模型或图画出来,让学生先进行自我的识别,然后再进行概念的     

角色扮演对培养初中生口语能力的作用及实践分析

正在巨大的升学压力面前,很多英语教师为了应付考试,往往忽略了对学生口语的训练,学生也对口语的训练重视不够,这样就出现了严重的聋哑英语现象。针对这种情况,英语教师可以在初中教学中应用角色扮演的模式,通过角色扮演,将学生学习的兴趣和动机充分激发出来,有效提升学生的口语交际能力。一、以循序渐进的原则设计每单元的角色扮演教学1.在每单元的Section A,选取模拟性角色扮演的方式在英语教学中,教师要结合课本对话内容,让学生对对话中