土木工程制图作业批改系统的研究与实现

为了解决目前高校土木工程制图教学中,教师无法逐一批改学生作业的问题,该文在独立研发的矢量图形平台ATVGP的基础上,探讨了矢量图形的识别与作业批改系统的实现方案,并提出了一种曲线识别思路.最后在VC＋＋环境下编程,实现了土木工程制图作业的自动批改功能.     

工程制图智能电子习题集软件系统的设计与实现

对工程制图智能电子习题集软件系统的设计进行了深入探讨,分析了对图形支撑平台系统的要求,提出一个开放的由习题库、答案库和习题三维模型库组成的电子习题集图形库系统;对工程制图作业的智能批改策略进行了深入探讨,包括工程制图习题作业自动批改要求、自动批改处理策略及一个基于图形特征结构的智能匹配的图形几何匹配方法;提出一个基于正向推理的图形匹配识别算法。     

智能图元特征提取与图形匹配技术

实现作业的智能化批改是本课程多年来未能突破的技术难点,作者要解决的正是这难点。其关键技术是图元特征提取与图形匹配,它为智能化批改的算法、设计与实现做了理论上的准备。并找到了图形匹配的方法,研究了图形匹配技术,并且成功地利用图形匹配技术,实现了规则图元和非规则图元(曲线)的智能批改。     

智能化批改制图作业的算法及实现

实现作业的智能化批改是计算机工程制图课程多年来未能突破的技术难点,该文要解决的正是这难点。其关键技术是图元特征提取与图形匹配,它为智能化批改的算法、设计与实现做了理论上的准备。该文详细介绍了各种图元智能批改算法,并且利用了DC[1]方法,实现了规则图元和非规则图元(曲线)的智能批改。     

工程制图网络习题集及智能批改系统的研究

分析了工程制图网络习题集及智能批改系统的基本功能,介绍了该系统的界面及系统的架构,并就系统的数据库设计进行了分析,给出了智能批改的实例。在所设计的系统中用户可以在客户机上登陆远程服务器,从服务器上的题库中下载题目。在 AutoCAD绘图环境中完成作业后,立即可以提交到服务器上的作业库中,并可以随时查得批改后的反馈信息。     

画法几何及机械制图作业批改系统及其图形数据库的设计与实现

从画法几何及机械制图教学的实际需要出发，选取了课程中较为重要的三个基础部分，即截交，相贯，组合体作为教学目标，课件开发了一教学软件，软件系统建立了图形数据，实现随意调取作业，自动批改学生作业，学生作业评分以及学生作业评语等功能，很好达到辅助教学的目的。     

基于反应器的制图作业批改CAI系统研究

针对工程制图课程与计算机绘图的有机结合,以AutoCAD软件为平台,运用ObjectARX的反应器机制,研究开发了CAD制图作业批改CAI系统。该系统包括选题、初始化、监视和作业批改四大模块。学生在AutoCAD环境中练习时,系统对其解题作图过程进行实时监视,并在自动批改后给予反馈信息与相应提示。由于整合了作业练习中做作业、改作业、订正错误的三个过程,提高了学生自主学习与练习的效果和效率。     

高职数学作业规范化管理改革与实施

高等数学是高职院校的重要基础课程,而作业在教学中起着重要的作用。本文通过加强作业规范化管理、提倡前置作业、布置分层次作业、改革作业的批改方式等提出了对高职高等数学作业方式的改革与实施。     

基于Java的作业批改系统的实现

本文针对开发作业批改系统中遇到的问题提出了作者自己的解决办法,涉及的技术方面主要有雷同作业的判断及展示的实现方案和批量运行作业文件实现方案。     

远程作业管理系统的研究应用

远程作业管理是远程教学的一个重要组成部分。随着网络的发展远程教育人群增多。其中作业管理面临着教师批改工作量大,作业得不到及时反馈等问题,主要分析目前在线作业系统的不足,根据现阶段高校作业批改的实际情况,分析系统功能需求,对系统总体架构做详细设计,最后描述系统各个功能的实现。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to