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.     

基于1：1数字环境的高校信息化管理探析

随着移动智能设备在高校师生中普及,新媒体广泛进入校园生活,形成师生都有智能终端的全新1：1数字校园,是新一代的高校管理空间和教育环境。面对新条件我们应与时俱进,在1：1数字管理理论、技术、应用层面创新,形成新型高校信息化内容、形式、方法、原则,探究新一代高校信息化体系的结构、功能、特色。基于新认知哲学观、人机交互技术及1：1数字环境,我们提出具身管理理念,基于认知逻辑、动力学的实证管理模式,创新高校信息化新思维。     

高黎贡山百花岭地区鞘翅目主要昆虫种群动态

于2006~2012年每年7月份在高黎贡山自然保护区百花岭地区对鞘翅目昆虫进行采集,通过鉴定,共发现22个科,64个种,其中,主要优势种群5个,分别为库光胫锹甲、双滴斑菁、橡胶木犀金龟、茶色金龟子和木棉天牛。并对优势种群动态进行了研究与分析,提出了相应防控建议。     

Dynamic reciprocal relations of achievement goals with daily experiences of academic success and failure: An ambulatory assessment study

Achievement goals have been linked to achievement in various educational settings. The present work explored day-to-day variations in achievement goals (mastery, performance-approach, performance-avoidance) and their associations with daily experiences of academic success and failure. Ambulatory assessment data from 108 students in Grade 5 were collected, with daily assessments of achievement goals in the morning and end-of-day reports of academic success and failure. Dynamic structural equation models revealed reciprocal within-person effects between mastery goals and academic success. Academic success was further associated with higher mastery and performance-approach goals in the next morning. Academic failure was linked to both performance goals, though this association was not robust in all sensitivity analyses. Higher average daily academic success and lower average academic failure were linked to better academic achievement one year later. Findings suggest meaningful within-person dynamics among goals and daily academic success and failure.     

浅谈高中古代诗歌表现手法

古典诗歌中诗人为充分表达情感都要借助一些有效的方式和方法,掌握诗歌鉴赏中常见的手法可以帮助高中生学会鉴赏并达到解题的目的。     

车辆刚体动力学ODE物性分析及虚拟仿真

为获得虚拟场景中车辆真实物理运动和交互性,提出一种基于开放式动力学引擎(ODE)的虚拟仿真平台集成方案.构建具有四自由度的汽车刚体动力学简化模型,分析其ODE特性及刚体连接机理,对车身和车轮之间的悬架系统进行分析,采用ODE中Hinge2进行模拟,分析其刚体动力学方程;基于Quest3D和VS2005进行刚体碰撞检测算法研究,构建一个能实现车辆刚体运动和碰撞检测的虚拟仿真平台,实时对车辆刚体动力学相关参数进行输出.经验证,该虚拟仿真系统具有良好的沉浸感、交互性和实用性.     

具有有向切换拓扑结构的二阶多智能体系统的领导随从一致

该文旨在研究具有非线性动力学特征和时变耦合时滞的二阶多智能体系统的领导随从一致性问题,所研究的系统具有切换的拓扑结构.基于Lyapunov泛函理论和线性矩阵不等式的方法,本文给出了一类领导随从一致的充分性条件,并通过具体实例验证所给判据的有效性.     

引入监督机制的政府信息公开演化博弈研究

政府信息公开是法律制度和行政行为的有机结合,根据《政府信息公开条例》的规定,政府部门有及时公 开信息的责任和义务。申请行为和公开行为都需要付出一定的费用或劳动,在引入监督机制的情形下,设定若干假设 及参数,对政府部门、公众与媒体等三方博弈做无差异分析,结合演化稳定策略及其相应的相位图做具体分析,由此 导出启示和建议,并对分析过程做出结论性判定。     

浅谈如何应用动力学普遍定理解题

根据动力学普遍定理的特点,通过分析已知量与待求量之间的关系、受力特征和运动特征,是应用动力学定理解题的一般方法与思路.     

高师体育专业部分项目分级分类教学法的探讨

通过多年的体育教学实践，根据部分体育术科内容的共性特点，对术科技术进行归类。其中主要是根据不同的运动形式，如：难易程度、动力学、解剖学、错误动作、接触与非接触等分类，改变传统分段教学中存在的弊端，为体育教学改革注入新的活力。