PLC的大型牵伸卷绕机的应用研究

本文介绍了大型牵伸卷绕机的计算机控制系统，以西门子MMV型变频器为驱动装置，西门子PLC300为控制核心，根据西门子USS协议和MPI协议，实现PLC与变频器、TP27触摸显示屏的通信，取得了较高的控制精度和稳定性，充分满足生产过程的需要，具有广阔的应用前景。     

平板显示设备贴附技术分析

随着国内平板显示设备日新月异的发展,其生产中的关键技术贴附技术也得到了长足发展。在整个平板显示器的生产过程中,很多地方都用到了贴附技术。由于材料及工艺的不同,选择的贴附方式也不尽相同。针对目前几种常见的贴附技术进行详细分析,提出不同贴附技术的优缺点及注意事项。在实际的生产过程中要根据材料及工艺要求选择合适的贴附技术。     

基于PLC的JHE21-160型高性能压力机控制系统设计

为了提高压力机工作的可靠性、安全性、快速性,采用西门子S7-300PLC和西门子触摸屏组成的闭环控制方案,设计了系统的主电路、控制电路,编制了系统的梯形图,设计了触摸屏操作画面。系统运行情况表明,该控制系统方案合理可行,稳定性好,可靠性高,压力机生产效率高,为压力机的自动控制提供了新的方法。     

基于嵌入式系统的触摸屏驱动设计与实现

为了满足触摸屏性能良好、运行稳定精度高的要求,本文提出了一种基于嵌入式系统的触摸屏驱动设计与实现方法。本方案以S3C2410微处理器为核心,采用嵌入式操作系统,设计与实现触摸屏驱动程序,测试证明本驱动工作高效、稳定。     

Accumulation of endogenous and exogenous nucleic acids in “Touch DNA” components on hands

Successful forensic DNA profiling from handled items is increasingly routine in casework. This “touch DNA” is thought to contain both cellular and acellular nucleic acid sources. However, there is little clarity on the origins or characteristics of this material. The cellular component consists of anucleate, terminally differentiated corneocytes (assumed to lack DNA), and the occasional nucleated cell. The acellular DNA source is fragmentary, presumably cell breakdown products. This study examines the relative contributions each component makes to the hand-secretions (endogenous) and hand-accumulations (exogenous) by recovering rinses from the inside and outside of worn gloves. Additionally, cellular and acellular DNA was measured at timepoints up to 2 h after hand washing, both with and without interim contact. Microscopic examination confirmed cell morphology and presence of nucleic acids. Following the novel application of a hair keratinocyte lysis method and plasma-DNA fragment purification to hand rinse samples, DNA profiles were generated from both fractions. Exogenous cell-free DNA is shown to be a significant source of touch DNA, which reaccumulates quickly, although its amplifiable nuclear alleles are limited. Endogenous DNA is mostly cellular in origin and provides more allelic information consistently over time.     

450A接触电流测试仪测试网络和数据采集的设计

本文介绍了450A接触电流测试仪关键技术内容。     

基于PLC的通信车配电机柜设计

本文根据通信车中各用电设备的用电特点,设计了以PLC为控制核心、以触摸屏为人机交互界面的配电机柜.通过传感器,实现电压、电流信号的采集.通过A/D转换模块,将传感器输出的模拟信号转换为PLC能识别的数字信号.通过触摸屏,实现各信号的实时显示及各用电设备的开关控制.     

恒流源LED触摸台灯的设计

LED（发光二极管）以高效、低耗、发光柔和见长。用它作照明是一个发展方向。LED的伏安特性决定了它最好采用恒流源供电；为方便操作、减小机械磨损、降低故障率采用触模式调光是一种不错的选择。为解决停电麻烦增加后备供电也是必要的，此时LED的低耗特性显示出巨大的优势。设计采用特殊的恒流电路、电源管理电路和触摸防抖动电路使LED扬长避短，工作稳定可靠。     

触摸调光控制芯片的设计与测试

电力作为一种方便的能源广泛应用于我们生活的各个方面,于是电能的节能变得尤为重要。由于家用照明设计可以从控制方面实现节能,因此人们可以根据自己不同时间的不同需要来调节灯光的亮度来达到节约电能的目的。本文提出了一种应用于家用照明亮度的调节控制芯片的设计方案,首先分析顶层模块的功能,再将其功能分类细化,分配到不同的子模块去实现,利用CMOS电压比较器来实现了过零检测、系统时钟脉冲产生、触摸控制等操作,并通过仿真软件验证了设计模块功能的正确性,最后经流片测试芯片功能满足设计要求。     

Direct drug analysis from oral fluid using medical swab touch spray mass spectrometry

Fourteen common drugs of abuse were identified in spiked oral fluid (ng mL⁻¹ levels), analyzed directly from medical swabs using touch spray mass spectrometry (TS-MS), exemplifying a rapid test for drug detection. Multiple stages of mass analysis (MS² and MS³) provided identification and detection limits sought by international forensic and toxicological societies, Δ⁹-THC and buprenorphine excluded. The measurements were made using a medical swab as both the sampling probe and means of ionization. The adaptation of medical swabs for TS-MS analysis allows non-invasive and direct sampling of neat oral fluid. Data acquisition was rapid, seconds per drug, and MS³ ensured reliable identification of illicit drugs. The reported data were acquired to investigate (i) ionization of common drugs from commercial swabs, (ii) ion intensity over spray duration, and (iii) dynamic range, all as initial steps in development of a quantitative method. The approach outlined is intended for point-of-care drug testing using oral fluid in clinical applications as well as in situ settings, viz. in forensic applications. The proof-of-concept results presented will require extension to other controlled substances and refinement in analytical procedures to meet clinical/legal requirements.