显像管外屏表面涂膜摩擦试验机的研制——原理与构成

本介绍用于显像管显示器外屏表面涂膜摩擦试验机的研制结果。试验机采用钢材底盘、铝型材框架结构，应用新颖的汽缸加荷控制技术实现磨擦刷头高精度加荷并往复磨擦涂膜等功能。它具有以下优点：兼容性强，可适于不同尺寸规格的显像管显示器；操作、维护方便。系统采用了触摸屏控制显示器，具有22个控制界面，配置了操作导航、数据设定与专家故障诊断等功能系统；磨擦刷头加荷精度高(全量程加压范围0～60kg内，绝对误差小于81k，相对误差小于0．18％，重复精度优于0．06％；常用加压范围2～10kg内，绝对误差小于10k)。     

全自动水泥强度综合试验机自动控制系统的设计与实现

随着加入WTO，我国建材行业全面推行水泥新标准和水泥ISO检验法，由于强度检验时加荷速率难以控制。因此设计了一套自动控制系统，对试验机进行自动控制来检测水泥的强度。     

100kN微机控制静重式力标准机的研制

一、概况随着测力与称重技术在国民经济的各个领域得到广泛应用,传感器的研究和应用出现了日新月异的新局面。然而,作为标定传感器的力学计量设备却仍处在技术落后、功能不全的阶段,改变这种现状已势在必行。1987年,为装备原机电部设在上海工业自动化仪表研究所的"质量检测中心",我厂研制了l00kN微机控制静重式力标准机,1990年研制成功。1991年初,经中国测试技术研究院比对测试,认为精确度高、技术先进,发给0.003级检定合格证。二、技术和先进性本机由主机、液压源、控制台三大部分组成,主机又由机架、砝码组、加荷框架、砝码加卸机构     

发动机运动件疲劳试验机转速的智能PID控制

介绍恒转速系统的一种智能PID控制技术,并以发动机运动件疲劳试验机的恒转速控制作为其应用实例,给出硬件原理框图,以及作为专家知识主体的一组控制规则.     

基于光子晶体光纤的在线压力监测技术

为了监测紧凑结构件的内部层间压力,提出一种采用新型材料保偏光子晶体光纤为敏感单元的嵌入式压力在线检测技术。建立了传感模型,采用Sagnac干涉技术组建检测系统,并进行了实验研究。通过实验验证,检测系统输出干涉峰值的移动量与光纤横向压力成线性关系,传感器可检测压力范围为0~10 kN,压力灵敏系数为0.4414 nm/kN,传感器精度2.6%,且能明显观测到光纤上方垫层材料的松弛效应。试验验证敏感单元的重复性能良好,且温度敏感系数仅为-11.8 pm/℃,使得该类传感器具有良好的抗温度干扰性及工程实际应用性。     

采暖锅炉检测与控制系统

为节省能源便于管理设计开发了采暖锅炉工况检测与控制系统。具有温度、压力检测，电耗、水耗计量，电机起停控制与保护等功能     

廉价压力检测电路非线性的分析

在消费类电子产品中,在节约成本的前提下,检测压力信号采用了以压力传感器为核心的廉价压力检测电路方案。电路主要包括:压力传感器、恒流激励、信号放大等,本文对廉价压力检测电路的非线性进行了理论分析和推导。     

失重秤及其在水泥熟料配料系统中的应用

在水泥生产过程中,水泥熟料配料系统是制约水泥成品质量和产量的重要环节之一.水泥熟料配料系统承担着计量和按照配比控制给料量的任务,使得磨制水泥所需的三种物料:水泥熟料、矿渣、石膏,按照一定比例和一定速度喂入水泥磨中.通过控制各种物料的比例,可以达到控制水泥产品质量的目的,通过控制物料的入磨速度,即给料量,可以使得水泥磨机运行在最佳的工作状态,最大地发挥水泥磨机的生产能力,使之既不过负荷运行,也不欠负荷运行,从而防止“闷磨”事故的发生,达到提高产能降低电耗的目的.以前水泥熟料配料系统常用的计量控制设备主要有三种:一是调速电子皮带秤,二是悬臂式电子皮带秤加上电磁振动给料机,三是圆盘喂料机.其中第3种配料装置最原始,通过人工拨动圆盘喂料机上下料挡板的位置,粗略地控制下料量,没有任何计量手段,水泥产品质量和水泥磨机的台时产能均难以得到有效的保障.前两种配料装置虽然在配料计量控制精度上较     

双咀水泥包装机的单片机控制

一、前言目前水泥包装机大多是机械计量,方法落后,精度低,劳动强度大。少数的电子计量也不令人满意。本方案采用8031学片微型计算机实现水泥包装过程的自动计量和控制,自动记录合格率、产量及累积袋数,自动显示零点。采用放大器自校准算法及给定值调整的软件自适应算法,提高了计量精度,较有效地克服了动态计量过程中冲击,     

模糊自适应PID在压力试验机中的应用

通过对压力试验机各项指标的深入分析,针对加压速率控制精度要求高的特点,运用模糊自适应PID参数的控制技术.克服了传统定常PID控制系数恒定的不足,提高了对水泥块抗压能力检测的精度.经实际运行表明,模糊自适应PID参数控制算法的实现.比定常PID控制的控制质量有明显提高.     

双编码器控制炼铁高炉料车运行

绝对型编码器替换炼铁高炉料车主令控制器,实现了该料车整个行程的数字化.采用双编码器控制高炉料车上料,满足了炼铁生产连续性要求.     

基于模糊神经网络模型和S7400架构的冷却系统

本文主要介绍的是通过基于模糊神经网络模型的控制和对现场噪声源的隔离,结合了西门子S7400架构开发与应用,通过WINCC监控画面,研发了新的冷却监控系统,实现了温度参数的准确监测,提高了轧件的成材率。     

Comparing Detection Methods For Software Requirements Inspections: A Replication Using Professional Subjects

Software requirements specifications (SRS) are often validated manually. One such process is inspection, in which several reviewers independently analyze all or part of the specification and search for faults. These faults are then collected at a meeting of the reviewers and author(s).Usually, reviewers use Ad Hoc or Checklist methods to uncover faults. These methods force all reviewers to rely on nonsystematic techniques to search for a wide variety of faults. We hypothesize that a Scenario-based method, in which each reviewer uses different, systematic techniques to search for different, specific classes of faults, will have a significantly higher success rate.In previous work we evaluated this hypothesis using 48 graduate students in computer science as subjects.We now have replicated this experiment using 18 professional developers from Lucent Technologies as subjects. Our goals were to (1) extend the external credibility of our results by studying professional developers, and to (2) compare the performances of professionals with that of the graduate students to better understand how generalizable the results of the less expensive student experiments were.For each inspection we performed four measurements: (1) individual fault detection rate, (2) team fault detection rate, (3) percentage of faults first identified at the collection meeting (meeting gain rate), and (4) percentage of faults first identified by an individual, but never reported at the collection meeting (meeting loss rate).For both the professionals and the students the experimental results are that (1) the Scenario method had a higher fault detection rate than either Ad Hoc or Checklist methods, (2) Checklist reviewers were no more effective than Ad Hoc reviewers, (3) Collection meetings produced no net improvement in the fault, and detection rate—meeting gains were offset by meeting losses,Finally, although specific measures differed between the professional and student populations, the outcomes of almost all statistical tests were identical. This suggests that the graduate students provided an adequate model of the professional population and that the much greater expense of conducting studies with professionals may not always be required.     

通过五粒子信道的非对称双向量子信息传输

利用一个五粒子团簇态为信道,分别提出了三个关于二粒子态和单粒子态的双向受控量子信息传输协议。在第一个协议中,通过引入辅助粒子,实施受控非门运算和Bell态测量,Alice能把二粒子未知态传送给Bob,同时Bob也能把单粒子未知态传送给Alice。在第二个方案中,通过引入辅助粒子、巧妙构造正交基和执行单粒子投影测量,Alice能帮助Bob远程地制备二粒子已知态,同时Bob也能帮助Alice远程地制备单粒子已知态。由于他们充分利用了前馈策略去构造测量基,制备任务能够完美完成。在第三个方案中,结合前两个方案的特点,Alice能成功将二粒子未知态传送给Bob,Bob也完美地在Alice处制备单粒子已知态。上述三个方案离开监控者的允许是不能实现的。     

任意二粒子纠缠态的受控量子通信

为了解决任意二量子通信问题,首先给出了五粒子和七粒子纠缠态的构造方法,并提供了它们的量子线路图。其次,以该五粒子纠缠态为量子信道,提出一个任意二粒子未知量子态的受控隐形传态协议。该协议在监察者Charlie的控制下,Alice进行四粒子投影测量和经典通信,Bob采用简单酉变换就能以100%的概率成功重构一个任意二粒子纠缠态。最后,利用七粒子纠缠态为量子信道,提出了任意二粒子纠缠态的联合受控远程制备方案。在此方案中,发送者Alice用自己掌握被制备态的部分信息构造测量基,发送者Bob采用前馈测量策略,接收者Diana在监控者Charlie的帮助下,通过简单幺正变换就能确定性地恢复原始态。     

Presenting software engineering results using structured abstracts: a randomised experiment

When conducting a systematic literature review, researchers usually determine the relevance of primary studies on the basis of the title and abstract. However, experience indicates that the abstracts for many software engineering papers are of too poor a quality to be used for this purpose. A solution adopted in other domains is to employ structured abstracts to improve the quality of information provided. This study consists of a formal experiment to investigate whether structured abstracts are more complete and easier to understand than non-structured abstracts for papers that describe software engineering experiments. We constructed structured versions of the abstracts for a random selection of 25 papers describing software engineering experiments. The 64 participants were each presented with one abstract in its original unstructured form and one in a structured form, and for each one were asked to assess its clarity (measured on a scale of 1 to 10) and completeness (measured with a questionnaire that used 18 items). Based on a regression analysis that adjusted for participant, abstract, type of abstract seen first, knowledge of structured abstracts, software engineering role, and preference for conventional or structured abstracts, the use of structured abstracts increased the completeness score by 6.65 (SE 0.37, p < 0.001) and the clarity score by 2.98 (SE 0.23, p < 0.001). 57 participants reported their preferences regarding structured abstracts: 13 (23%) had no preference; 40 (70%) preferred structured abstracts; four preferred conventional abstracts. Many conventional software engineering abstracts omit important information. Our study is consistent with studies from other disciplines and confirms that structured abstracts can improve both information content and readability. Although care must be taken to develop appropriate structures for different types of article, we recommend that Software Engineering journals and conferences adopt structured abstracts.

多线程微机控制配料系统软件的设计与实现

讨论了在微机控制配料系统中,双秤配料系统的工作原理与计算机控制原理,并给出了软件设计流程图及实现多线程控制的程序代码.该方法目前已经应用到饲料加工生产中,对提高生产速度和生产率起到了至关重要的作用.     

控制电位电解法H_2S气体传感器

介绍了一种运用控制电位电解原理，采用一体化气体扩散电极的H2S气体传感器。阐述了它的原理，并详细说明传感器的研制过程，对其结果进行了讨论。     

Controlled Semi-Markovian Fields on a Graph

The concept of a semi-Markovian controlled process on a graph is introduced in the form of two problems. The results which hold for controlled Markovian processes on a graph and ordinary semi-Markovian decision-making processes are formulated for them.