初探"微机原理与接口实验装置"的监控程序

实验装置和PC机的通讯设计包括实验装置的监控程序设计、实验装置与PC机的接口设计以及安装在PC机上的调试界面软件设计三部分内容。监控程序是实验装置必须有的软件,下位机(实验装置)监控程序和上位机(PC机)调试界面软件通过串行接口的结合共同完成学生做实验所应具备的功能。     

一种快速低振运动装置设计

针对某些特殊场合需要的快速低振的工作需求,设计出一种利用蜗轮蜗杆驱动的快速运动装置,进行装置结构设计、参数计算.利用Solidworks软件建立三维模型,并进行实验样机制造和实验.实验结果表明:装置的执行机构在100ms内打开120°,且无冲击,满足设计要求.     

石油采油机械综合性测试实验装置的设计和应用

石油采油机械综合性测试实验装置以及其配套测试仪器的研制具有重要意义,石油采油机械综合性测试实验装置开发和设计的一系列项目有助于转变传统的单一实验验证模式,使实验装置更加具有综合性,功能更加多元化。新型的石油采油机械综合性测试实验装置相比与传统的实验设备能更好地适应时代的发展和科技的需求。     

新型多用途电工实验装置开发与应用研究

开发新型多用途电工实验装置,能够改变过去固有化模块化验证型实验装置。对于新型多用途电工实验装置,我们需要开发出是新型的没有固定步骤和固定电路参数,能进行独立设计与调试来完成实验的多用途电工实验装置。通过这种新型多用途电工实验装置,来提升学生们的主观积极能动性,进而提升其实践能力、创新精神以及创造能力。本文分别以开发新型用途电工实验装置的意义、如何开发新型用途电工实验装置以及其应用研究来进行阐述。     

一种电能测量实验装置的设计

针对当前电气测量技术课程中存在的实验教学方面的问题,设计了一套基于超低功耗微控制器MSP430F149的低成本、结构简单的电能测量实验装置。介绍了实验装置的硬件设计,并对其功能及实验例程作了阐述。将该实验装置应用于电气测量技术实验教学,有利于学生掌握电能测量流程,对交流采样、采样信号处理、液晶显示等方面知识有更好的理解。     

简易电热锅炉实验装置设计

设计了一套简易电热锅炉实验装置。详细阐述了实验装置的组成,包括控制器、测温传感器、变送器等硬件的选型,设计了电气控制电路。设计的电热锅炉操作简单,安全可靠,是非常理想的学生实训平台。     

净水厂生产性实验装置运行及参数控制方法探讨

本文参考国内若干生产性实验装置的设计运行状况,研究系统运行和参数控制的关键节点,并提出了基于东北地区湖库型原水的生产性实验装置的关键技术节点。     

过程装备控制实验装置的开发与应用

我们根据过程装备与控制工程专业的教学要求,设计了两套实验装置,这一实验装置可以充分的模拟工业生产过程中各种温度、压力、流量、液位等参数的自动化控制,而且这一装置可以根据实际需要进行多样式的实验流程,从而更好的满足在学习中的不同需要。     

多普勒效应测量物体运动速度的实验设计

本文介绍了设计性实验"多普勒效应测量运动物体的未知速度",设计出一套测量运动物体速度的实验装置,该装置主要由DH-DPL1多普勒效应及声速综合测试仪、控制物体运动的智能控制系统和测试架等组成,学生通过该实验加深了对多普勒效应测速原理的理解。     

磁阻尼与动摩擦系数测定实验中误差分析装置的设计

根据磁阻尼与动摩擦系数测定实验原理,设计出一套磁阻尼与动摩擦系数测定实验的误差分析装置,大大提高实验精度和实验效率。     

Intelligent information retrieval: Part IV. Testing the timing of two information retrieval devices in a naturalistic setting

This article is Part IV in a series of articles that report the results of a two year research program the purpose of which is to design and test intelligent information retrieval (IR) devices for undergraduates researching a social science term paper. The devices are task-facilitating, helping the undergraduate perform the task of researching and writing a term paper, and they provide a mold which takes the students’ amorphous conception of their information need, turning it into an effective query to the IR system. The present article reports the results of two studies which tested an uncertainty expansion IR device and an uncertainty reduction IR device in naturalistic settings. The devices are designed to be given at different stages of Kuhlthau’s information search process (ISP). In both studies, undergraduates were randomly assigned to either the test group, who received the device intervention, or a comparison group. In Study 1, we found that the comparison group received a higher mean mark than students in the uncertainty expansion group. In Study 2, we found that the uncertainty reduction group received a higher mean mark than the comparison group when the device was given later in the student’s ISP. We conclude that the timing of the device interventions is crucial to their potential efficacy.     

A rotary variable admittance device and its application in vehicle seat suspension vibration control

In this paper, a novel semi-active variable admittance (VA) concept is proposed, and a seat suspension prototype with a magnetorheological fluid damper based rotary VA device is designed, manufactured, and experimentally validated. The conventional inerter with a single flywheel has a constant inertance, which can effectively improve the suspension performance by being integrated into a mechanical network with springs and dampers. The proposed rotary VA device comprises a gear reducer, two flywheels and a variable damping (VD) device which is used to connect the two flywheels. With carefully designing, the rotary VA device is compacted and is similar with a VD device in size. The rotary VA device is installed in the centre of a seat suspension's scissors structure to form a VA seat suspension. According to the test results, the equivalent inertance of the seat suspension can vary from 11.3 Kg–76.6 Kg with a 3 Hz frequency and 5 mm amplitude sinusoidal movement by changing the current from 0 A–1 A. By analysing the system characteristics, a hybrid controller with two acceleration feedbacks is proposed. Thereafter, the seat suspension and controller are validated in experiments by comparing the performance with a conventional passive seat suspension. The random vibration test shows the excellent performance of the proposed seat suspension; the frequency weighted root mean square acceleration of the seat is reduced by 43.6%, which indicates a great improvement of the ride comfort. The VA device shows great prospect in the suspension application.     

施工升降机防坠安全器检定后产生噪声的原因分析

施工升降机防坠安全器检定后用户集中反映防坠安全器噪声的问题较突出,用户甚至怀疑检测机构在进行检定时造成了防坠器的损坏,噪声已经成为防坠安全器安全使用中普遍关心的问题。文章就检定后产生噪声的因素进行了分析,提出了控制噪声故障的一些建议。     

基于CPLD的便携式飞参系统检测仪研制

飞行参数记录仪是飞机普遍配置的重要机载设备,为确保其工作正常,需通过专用的测试设备对其进行定期检测。针对某型测试设备体积庞大,结构复杂,不方便携带,难以进行现场测试的问题,本文设计了一种基于CPLD的便携式飞参系统检测仪。通过在多个机场的飞行参数检测试用,表明该检测仪具有硬件可靠性高、速度快、体积小、重量轻、性价比优良、使用维修方便的特点。     

纱窗清洁装置的设计

介绍一种便捷、高效的纱窗清洁装置,新型纱窗清洁装置的设计在理论设计的基础上通过模拟实验验证并完善.     

A low cost design and fabrication method for developing a leak proof paper based microfluidic device with customized test zone

This article describes a fabrication process for the generation of a leak proof paper based microfluidic device and a new design strategy for convenient incorporation of externally prepared test zones. Briefly, a negative photolithographic method was used to prepare the device with a partial photoresist layer on the rear of the device to block the leakage of sample. Microscopy and Field Emission Scanning Electron Microscopy data validated the formation of the photoresist layer. The partial layer of photoresist on the device channel limits sample volume to 7 ± 0.2 μl as compared to devices without the partial photoresist layer which requires a larger sample volume of 10 ± 0.1 μl. The design prototype with a customized external test zone exploits the channel protrusions on the UV exposed photoresist treated paper to bridge the externally applied test zone to the sample and absorbent zones. The partially laminated device with an external test zone has a comparatively low wicking speed of 1.8 ± 0.9 mm/min compared to the completely laminated device with an inbuilt test zone (3.3 ± 1.2 mm/min) which extends the reaction time between the analyte and reagents. The efficacy of the prepared device was studied with colorimetric assays for the non-specific detection of protein by tetrabromophenol blue, acid/base with phenolphthalein indicator, and specific detection of proteins using the HRP-DAB chemistry. The prepared device has the potential for leak proof detection of analyte, requires low sample volume, involves reduced cost of production (∼$0.03, excluding reagent and lamination cost), and enables the integration of customized test zones.     

电涌保护器安全巡检仪的开发

电涌保护器安全巡检仪是为了满足对电涌保护器进行常规和定期快速检测工作需要而开发的,是一款集合了多种仪表测试功能的一款多功能、智能型便携仪表.对电涌保护器安全巡检仪的原理及设计思路作以介绍的同时,对仪表的硬件设计、软件设计,以及主要元件的选择等问题作了简单介绍,并说明了系统设计、调试时应该注意的问题.     

基于嵌入式Lunix的CAN总线节点的设计

提出了一种基干32位微控制器S3C2410的CAN总线的分布式控制系统方案,介绍了在ARM处理器S3C2410上扩展CAN总线设备的硬件接口设计,讨论了CAN设备驱动程序和CAN总线通信等的设计方法与实现。经实验证明,此结构简单,稳定性和可靠性强。     

Simulation guided design of a microfluidic device for electrophoretic stretching of DNA

We have used Brownian dynamics-finite element method (BD-FEM) to guide the optimization of a microfluidic device designed to stretch DNA for gene mapping. The original design was proposed in our previous study [C. C. Hsieh and T. H. Lin, Biomicrofluidics 5(4), 044106 (2011)] for demonstrating a new pre-conditioning strategy to facilitate DNA stretching through a microcontraction using electrophoresis. In this study, we examine the efficiency of the original device for stretching DNA with different sizes ranging from 48.5 kbp (λ-DNA) to 166 kbp (T4-DNA). The efficiency of the device is found to deteriorate with increasing DNA molecular weight. The cause of the efficiency loss is determined by BD-FEM, and a modified design is proposed by drawing an analogy between an electric field and a potential flow. The modified device does not only regain the efficiency for stretching large DNA but also outperforms the original device for stretching small DNA.     

Flip channel: A microfluidic device for uniform-sized embryoid body formation and differentiation

This paper reports a two-layered polydimethylsiloxane microfluidic device—Flip channel, capable of forming uniform-sized embryoid bodies (EBs) and performing stem cell differentiation within the same device after flipping the microfluidic channel. The size of EBs can be well controlled by designing the device geometries, and EBs with multiple sizes can be formed within a single device to study EB size-dependent stem cell differentiation. During operation of the device, cells are positioned in the designed positions. As a result, observation and monitoring specific population of cells can be achieved for further analysis. In addition, after flipping the microfluidic channel, stem cell differentiation from the EBs can be performed on an unconfined flat surface that is desired for various differentiation processes. In the experiments, murine embryonic stem cells (ES-D3) are cultured and formed EBs inside the developed device. The size of EBs is well controlled inside the device, and the neural differentiation is performed on the formed EBs after flipping the channel. The EB size-dependent stem cell differentiation is studied using the device to demonstrate its functions. The device provides a useful tool to study stem cell differentiation without complicated device fabrication and tedious cell handling under better-controlled microenvironments.