Using the generalized interpolation material point method for fluid-solid interactions induced by surface tension

This thesis is devoted to the development of new, Generalized Interpolation Material Point Method (GIMP)-based algorithms for handling surface tension and contact (wetting) in fluid-solid interaction (FSI) problems at small scales. In these problems, surface tension becomes so dominant that its influence on both fluids and solids must be considered. Since analytical solutions for most engineering problems are usually unavailable, numerical methods are needed to describe and predict complicated time-dependent states in the solid and fluid involved due to surface tension effects. Traditional computational methods for handling fluid-solid interactions may not be effective due to their weakness in solving large-deformation problems and the complicated coupling of two different types of computational frameworks: one for solid, and the other for fluid. On the contrary, GIMP, a mesh-free algorithm for solid mechanics problems, is numerically effective in handling problems involving large deformations and fracture. Here we extend the capability of GIMP to handle fluid dynamics problems with surface tension, and to develop a new contact algorithm to deal with the wetting boundary conditions that include the modeling of contact angle and slip near the triple points where the three phases -- fluid, solid, and vapor -- meet. The error of the new GIMP algorithm for FSI problems at small scales, as verified by various benchmark problems, generally falls within the 5% range. In this thesis, we have successfully extended the capability of GIMP for handling FSI problems under surface tension in a one-solver numerical framework, a unique and innovative approach.Chapter 1. Introduction -- Chapter 2. Using the generalized interpolation material point method for fluid dynamics at low reynolds numbers -- Chapter 3. On the modeling of surface tension and its applications by the generalized interpolation material point method -- Chapter 4. Using the generalized interpolation material point method for fluid-solid interactions induced by surface tension -- Chapter 5. Conclusions

The program decision analysis of water intake and drainage project of Z nuclear power plant

核能发电作为一种安全、经济、清洁的能源。近年来，随着中国核电项目建设的快速发展，国家对核电厂的取水安全问题和温排水对环境的影响也越来越重视。取排水工程投资规模较大，项目实施难度大，核电厂投资者如何在保证取水安全和经济效益的前提下，尽量减少对周边环境和相关利益者的影响显得尤为重要。因此，开展取排水工程的研究分析，为决策者提供合理科学的决策依据是必要的。 本文以Z核电项目取排水工程为案例，探讨研究核电厂取排水工程的项目决策分析。本文首先结合Z核电项目所处海域自然环境条件以及取排水工程设计等方面要求，通过头脑风暴法和专家咨询法，提出可能的取排水方案。然后根据国家法律法规的要求和专家咨询意见，筛选出...Nuclear power is as a kind of security, economic, clean energy.With the rapid development of China's nuclear power plant, the national pay more and more attention on the security of nuclear power water intake and the influence of the warm discharge water to the environment.The waterintake and drainage project will cost lost of money and the project implementation is complex, The investors how to e...学位：工程硕士院系专业：管理学院_工程硕士(项目管理)学号：X201215304

信用利差与债券市场流动性的动态关系分析

本文利用我国交易所和银行间两个国债市场流动性差异提取我国债券市场的流动性溢酬,首先运用多元线性回归模型验证了流动性溢酬是影响信用利差的系统性因子,然后运用VAR模型和Granger因果检验探讨流动性溢酬与信用利差之间的动态关系,并进一步引入带马尔可夫机制转换的VAR模型,分析在正常机制和危机机制下流动性溢酬对信用利差的不同影响。实证结果表明：前一期流动性溢酬对当期信用利差有显著为正的影响,危机机制下的影响要显著高于正常机制,而且危机机制下流动性溢酬对低等级债信用利差的冲击程度要大于对高等级债信用利差的冲击程度,但冲击效应的持续时间则少于高等级债。国家自然科学基金青年项目“限价指令簿的信息内涵研究：基于市场微观结构的视角”（71301137

加强党的执政能力建设的信息基础初探

加强党的执政能力建设、确保党的先进性、巩固党的执政地位,是事关社会主义事业兴衰成败的历史新课题。在信息时代,准确把握来自各个方面的信息,已经成为执政党统一思想、提高效率、联系全体党员和人民群众、推行政治民主的基本条件。因应信息时代的新特点,充分利用信息科学技术,推进执政党自身、社会公众和执政党员三大要素的交往与互动,是加强党的执政能力的重要课题

Application Skill of Multisim in The Design of Digital Electronics

在电子仿真世界Multisim是最为普及的,因此为设计自动化带来了很大方便。在数字电子技术领域成许多学者学和教的工具。然而,在Multisim环境下,有些仿真和设计的结果并不一样,使仿真很难进行。用Multisim进行数字钟设计的仿真,同样也会出现问题,但该问题是可分析的,并能够设法加以解决的。Multisim is the world's most popular electronics simulator,It takes a very convenient way for people to make electronics auto-design. In the field of the techiniques of digital electronics , Multisim has become the teaching and learning tool of choice for thousands of educators. But in the environment of Multisim, some of simulation gets different result from design, and it is difficult for simulation to continues. Apply Multisim to design digital clock,it can be any problems also, but it can be analysed ,, and make way to solution

进口促进战略有助于中国产业技术进步吗?

中国出口导向型的经济发展模式使进口贸易长期处于“为出口而进口“的从属地位,积极的进口促进战略是否可以有效促进产业技术进步？本文区分资本品、中间品和消费品的实证分析表明,出口导向背景下的进口,尤其是资本品和中间品进口对中国产业技术进步的影响效应比出口更积极,但对技术进步的影响效应不显著。因此,进口促进战略与基于出口导向型战略的进口相比,在基本的战略内容上需要有根本性的改变。为此,本文超越国际r&d溢出分析框架,从理论上分析了进口促进战略促进资源重新配置,推动发展模式转变进而促进技术进步的机理。国家自然科学基金项目“并购与创新:基于中国装备制造业理论与实证研究”(71573219);“二元分工网络约束下中国装备制造业自主创新的机制研究”(71103152); 广东省自然科学基金项目“广东省装备制造业并购模式选择及其创新绩效”(2014A030313007)的前期研究成

Battery pack thermal management based on thermo electric cooling and phase change material heat preservation

为提高户外基站备用电池组的工作性能、延长使用寿命，需要进行冷却和保温。将半导体制冷(TEC)与相变材料(PCM)保温相结合，对基站用48 V铅酸电池组进行热管理。模拟分析TEC的布置、制冷功率和环境温度对冷却保温效果的影响。TEC设置在电池组前后两侧、制冷功率为170 W时，可降低电池的温度、提高冷却阶段电池组温度场的一致性、延长保温时间。电池组经过连续的冷却保温过程，仍处于最佳工作温度范围，电池充放电时的最高温度可得到抑制

超精密磨床主轴部件热特性的有限元分析

【中文摘要】 加工中机床热误差是影响机床加工精度稳定性的关键因素,对其进行准确的分析至关重要。文章运用ANSYS软件建立超精密磨床主轴部件的有限元模型,分析主轴热源及初始条件,边界条件,通过计算得到磨床主轴的温度场、热应力及热变形量。分析结果说明了热误差为超精密磨削的主要误差,为后期加工和试验分析提供了参考依据。863计划重点项目课题(2008AA042501

基于双MCU通信的改进型燃烧控制器

针对当前国内设计的燃烧器安全性不高的缺点,本文设计了一种基于双MCu通信的改进型强制通风燃气燃烧控制器,以优化燃烧器的电控系统,增强燃烧器安全性。本设计以两片PIC16f886单片机作为主控芯片,通过串行共享EEPrOM进行双机通信以增强安全性,并采用了其他保障系统安全稳定运行的设计,其中使用电容降压电路为整个程控器供电,通过倍压整流电路控制继电器的工作电源,多级三极管驱动继电器来控制外部设备,实现了燃烧器的点火、燃烧、熄火保护、诊断和报警等功能。本设计经过实际测试、验证,实现预期功能

Design and Analysis of Vibration Energy Collector Based on MEMS

微能量采集器中电容式采集器易与IC工艺集成,目前已知的传统电容式微能量采集器都需要外加电压,这在很大程度上限制电容式微能量采集器的实际使用。针对该问题,基于微机电系统工艺,提出功函数原理电容式微能量采集器,给出采用两种不同金属作为电容极板电极的采集器原理模型设计,并建立相应系统数学模型,计算大致悬臂梁长度的设置与范围,使用有限元模拟软件AnSyS进行进一步分析与优化设计。在此理论基础上设计出的新型振动能量采集器,可克服传统电容式微能量采集器需要外界提供电源这一缺点。The traditional electrostatic converters need separated voltage source which is very difficult in the practice.A new vibration-powered electrostatic converter with the principle of work functions is presented.The design of the converter is based on MEMS technology,and adopts two kinds of different metal as the electrode plates of the capacitor.The math model is established to determine the parameters of cantilever beam.And with the aid of the finite element software,this model is tested and the dimension is modified to ensure that the electrostatic converter can work optimally.This new method gets rid of the dependence on additional voltage source.The process flow is developed and the prototype collector is successfully produced.福建省科技重大专项/专题(2006HZ0002-4);福建省创新团队和福建省自然科学基金(E0610032)资助项