气体流量测量的温度与压力补偿

综述了干,湿气体及水蒸气流量测量中的温度,压力补偿方案,还介绍了其它类型流量计的温度,压力实偿,指出几点应注意的问题。     

压力传感器的温度补偿

压力传感器是工程中常用的压力测量器件,由于温度的影响,其零点经常会发生漂移,因此需要绎它进行温度补偿。本文介绍了由单片机控制的具有温度补偿功能的压力传感方案,可直接数字显示测量结果,具有良好的应用前景。     

无热敏元件的温度补偿压力传感器

<正> 自从压力传感器进入工业控制等实用领域以来,温度补偿技术一直是广大研制人员所从事的主要课题之一。到目前为止,大多数的压力传感器都是以热敏元件(热敏电阻)做为感温、测温、电路补偿的中心元件,这种方法对传感器的可靠性有较大的影响,且调试过程也较为复杂,不利于传感器     

压力传感器的温度补偿

压力传感器是工程中常用的测量器件，由于温度的影响，其零点经常会发生漂移，因此需要对它进行温度补偿。介绍了由单片机控制的具有温度补偿功能的压力传感器设计方案，可以直接数字显示测量结果，具有良好的应用前景。     

压力传感器温度漂移补偿的控制电路设计

介绍了一种压力传感器的温度补偿方法,这种方法解决了压力传感器温度漂移的问题.本文详细阐述了一种实用的整体补偿电路.这种电路是一种由单片机控制,使用软件补偿的传感器测量电路.在软件上设计了一种对压力传感器非线性及温度变化所引起的误差进行补偿的软件算法[1].在一定的温度和压力范围内实现0.2%的测量精度,完全可以满足实际的需要.     

压力补偿型超声波流量测量系统的设计

超声波流量检测技术是近年来流量检测领域的一个亮点,为提高测量的精度需要对所测流量值进行压力补偿。本文以时差式超声波流量测量过程中的压力补偿为主要研究对象,设计了压力补偿系统的硬件电路和软件程序,结果系统总误差小于技术指标5％。     

扩散硅压力传感器及其温度补偿

讨论了扩散硅压力传感器及其温度补偿问题，给出了压力传感器模拟补偿和基于微处理器迸行数字补偿的一般方法。数字补偿方法可将压力传感器的精度提高到 0．05％～01％ FS。     

高温高压化学传感器检测校正平台温度控制技术研究

对高温高压化学传感器检测校正平台的温度控制系统进行了分析，建立了系统优化的数学模型。该系统存在两级滞后，而且受到环境温度和反应釜内热液流速的干扰，普通PID控制不能及时对干扰产生抑制作用，而使控制系统出现较大超调，温度波动较大，控制系统的动态性能很差。而化学传感器检测校正需要的温度条件非常苛刻，对温度的控制精度要求极其严格，所以需要一种新的解决办法。介绍了一种对系统的两级滞后环节采用PID和双Smith预估反馈的方法。在系统MATLAB仿真和实际试验中得到了良好的效果，满足系统的精度要求。     

模块化建模方法及其在车辆传动系中的应用

在分析了传统建模方法缺陷的基础上 ,提出了模块化建模方法的基本概念 ,并分析了模块化建模方法的特点 ,从模块划分、模块模型的建立、建模工具选择及建模时的因果关系几个方面阐述了模块化建模方法的运用 ,同时指出了模块划分中的关键问题及解决方法 ,并从模型验证的角度回答了可靠性及测试和仿真结果正确性如何检验等问题。最后以车辆传动系统建模为例 ,说明了模块化建模方法的应用。     

Modelling the User

The relatively high percentage of people with disabilities in Europe combined with the facts of ageing population, strong relation of impairment to age, and as State of the Art shows, dissatisfaction or even unawareness of people with disabilities of available assistive technology are revealing the necessity to incorporate a user-centric approach that beyond 2nd generation practices will achieve to provide embedded and built-in accessibility solutions, as well as toolkits for developers, for ＂engraving＂ accessibility in existing and emerging mass-market ICT-based products, aiming to make accessibility open, plug and play, personalised and configurable, realistic and applicable in various contexts, keeping always the user in the loop. The AEGIS （Accessibility Everywhere： Groundwork, Infrastructure, Standards） IP （Integrated Project） of the 7th European Framework Programme seeks to determine whether 3rd generation access techniques will provide a more accessible, more exploitable and deeply embeddable approach in mainstream ICT （information and communication technologies）. This paper presents the holistic UCD （user-centered design） implementation plan, upon which AEGIS has been based in order to achieve its targets, starting from modelling its target users, in the most efficient way possible.     

Modelling of interstitials in the bcc phase

There are several widespread thermodynamic datasets which produce a spurious bcc interstitial solution at high temperature and high X content (X is an interstitally dissolved element). The reason for this is the standard model for bcc interstitial solutions (M(V a,X)₃), which requires careful selection of optimising parameters to minimise spurious appearances of the bcc phase. In this work the model M(V a,X)₁ is suggested as an alternative. This model is much easier to handle and its parameters can be directly compared with those of the fcc phase. The two models are compared for the Fe–C and Nb–N systems. In the Fe–C system almost identical results are achieved. In Nb–N there are some differences for high N content, but there is no experimental data to clearly support any model.     

Modelling groupware in the electronic office

This is a report on a project now completed, to explore ideas for a distributed software system intended to enhance people's ability to communicate effectively and conveniently, to give them information about each others' status and whereabouts, and to support them in planning and executing various kinds of computer-supported office tasks both alone and in collaboration. The purpose of the project was to explore architectural issues, user-interface issues, and the definition of possible future products. The approach taken was to create software models of scenes written by a multi-disciplinary team, and to create performances using these models. The paper reviews the objectives of the project, discusses the approach, architecture and implementation, and draws conclusions both about the approach adopted and the ideas explored.     

Modelling the student in Pitagora 2.0

With the aim to individualise human-computer interaction, an Intelligent Tutoring System (ITS) has to keep track of what and how the student has learned. Hence, it is necessary to maintain a Student Model (SM) dealing with complex knowledge representation, such as incomplete and inconsistent knowledge and belief revision. With this in view, the main objective of this paper is to present and discuss the student modelling approach we have adopted to implement Pitagora 2.0, an ITS based on a co-operative learning model, and designed to support teaching-learning activities in a Euclidean Geometry context. In particular, this approach has led us to develop two distinct modules that cooperate to implement the SM of Pitagora 2.0. The first module resembles a classical student model, in the sense that it maintains a representation of the current student knowledge level, which can be used by the teacher in order to tune its teaching strategies to the specific student needs. In addition, our system contains a second module that implements a virtual partner, called companion. This module consists of a computational model of an average student which cooperates with the student during the learning process. The above mentioned module calls for the use of machine learning algorithms that allow the companion to improve in parallel with the real student. Computational results obtained when testing this module in simulation experiments are also presented.     

Modelling the Texture of Paint

We present an extension to the WET & STICKY model. A method of modelling textured and shiny paint is described using bump mapping and standard illumination models. The qualities of the paint are used to supply input to the texture and lighting models. We demonstrate that a dynamic model of textured paint provides the user with valuable visual cluesfor the production of realistic painted images. We also propose further extensions which would allow the use of different lighting models for different paints, allowing for paint attributes which are unachievable either with traditional painting or with earlier forms of electronic painting.     

单元机组协调控制系统数学模型的研究及品质提升方法

单元机组协调控制系统中机炉对象的数学模型研究是近年来火力发电厂自动化技术研究中的热点,如何提高机组的负荷响匠速率,缩短负荷响应纯迟延时间,以及提高机组稳定性指标是电网和发电公司的共同目标。文章研究分析了近年来国内应用比较成功的工程技术方案和研究成果,对各方案的方法和结果做了类比,结合自身经验对应用成果中的非线性数学模型和线性数学模型环节的应用方法做了介绍。     

Modelling the Double Peak Phenomenon in pharmacokinetics

Two methods of modelling the Double Peak Phenomenon in pharmacokinetics are described; both are based on compartmental models. The first method assumes that the absorption of the drug from the gut to the systemic plasma varies with the location of the drug in the gut, with negligible absorption through the jejunum. It has the advantage of clear physiological interpretation, but there are a comparatively large number of parameters to be estimated. The second method assumes simultaneous input via two parallel pathways, and has been developed with the aim of reducing the number of parameters in the model. However, this approach lacks the direct relationship to physiology. The two methods are used to model two data sets provided by AstraZeneca and a further data set from the literature, describing the pharmacokinetics of veralipride. For all three data sets, the measurement is of concentration of drug in the systemic plasma following oral administration in solution form.