Dynamic behaviour of a magnetically actuated floating liquid marble

This paper reports the dynamic behaviour of a magnetically actuated floating liquid marble by analysing the oscillation of the marble. A liquid marble is a liquid droplet coated with hydrophobic powder. Magnetite particles inside the marble make it magnetic. The marble floats on a carrier liquid that contains aqueous glycerol of various concentrations. A permanent magnet located under the carrier liquid drives the floating marble with the initial velocity. Stopping the magnet abruptly causes the marble to oscillate around its final position for a few seconds. The oscillation was recorded and analysed using customised image processing and evaluation software. The damped harmonic motion model was then applied to the data and tested. Subsequently, critical parameters of the system such as the initial displacement, friction correction factor, the apparent frequency and the spring constant were determined and discussed. The simple experimental set-up and convenient theoretical approach allow us to characterise the marble motion under the influence of a magnet with good accuracy.     

Externalizing cognitive maps via map reconstruction and verbal description

Universal Access in the Information Society - Helping blind people to build cognitive maps of an environment is one of the aims of several assistive systems. In order to evaluate such assistive...     

基于PC104的某型测试设备的设计实现

该文介绍了一种基于PC104总线的某型测试设备的硬件设计和软件设计方案,提出了主要问题的解决方案。该系统结构紧凑,可靠性高,已在实际生产中得到应用。     

Performance evaluation of a dental handpiece in simulation of clinical finishing using a novel 2DOF in vitro apparatus

This paper reports on the performance evaluation of a dental handpiece in simulation of clinical finishing using a novel two-degrees-of-freedom (2DOF) in vitro apparatus. The instrumented apparatus consisted of a two-dimensional computer-controlled coordinate worktable carrying a dental handpiece, a piezoelectric force dynamometer, and a high-speed data acquisition and signal conditioning system for simulating the clinical operations and monitoring the dental finishing processes. The performance of the dental handpiece was experimentally evaluated with respect to rotational speed, torque, and specific finishing energy under the applied clinical finishing conditions. The results show that the rotational speeds of the dental handpiece decreased by increasing either the depth of cut or the feed rate at a constant clinically applied air pressure and water flowrate. They also decreased when increasing both the tangential and normal finishing forces. The specific finishing energy decreased with an increase in either depth of cut or feed rate, while the finishing torque increased as either the depth of cut or the feed rate was increased. Implications of these results were to provide guidance for proper applications of dental handpieces in clinical practice.     

论《罗伯特议事规则》在公共事业管理课程实训教学中的应用

文章立足于公共事业管理专业培养目标和实践教学的特点,分析了在公共事业管理专业开展《罗氏议事规则》实务训练的选题背景和必要性,论述了《罗氏规则》实训的设计方案及具体操作流程,总结了实训工作取得的成果,提出了增强实务训练效能的技巧和应注意的相关问题。     

江西经济发展走势对运输需求的分析与预测

区域经济的发展是运输需求的源泉。新世纪以来,江西经济进入了持续稳定发展的快车道,极大地促进了运输需求的持续增长,运输线路长度不断延长,全社会运输量不断增加。随着江西经济社会快速发展,城镇化进程的加快,资源环境约束压力的加大,运输需求结构提升,对运输需求提出了更高的要求,运输需求多样化、个性化、机动化、快速化和网络化的趋势更加显著。     

四川餐饮业信息化人才状况调查与分析

四川餐饮业发展迅猛,为了解餐饮企业信息化发展情况,尤其是餐饮业信息化人才状况,课题组对四川餐饮企业进行了信息化抽样调查。调查涵盖餐饮企业信息化实施总体情况,包括信息化水平、运用效果以及餐饮企业对信息化的认识,调查侧重于餐饮企业现有信息化人才结构状况和需求期待,并对调查数据进行了科学和客观分析,旨在为信息化人才标准和培养模式探索提供依据、奠定基础。     

浅谈大学英语学习中的误区及对策

本文作者从六个方面总结并分析了大学英语学习中存在的误区,指出英语学习是一个循序渐进的过程.需要大量听、说、读、写的反复训练及文化背景知识的学习积累,以期给学习者一些启示.