AutoCAD绘图实用技巧

在使用AutoCAD绘图软件的过程中,初学者往往会遇到意想不到的问题,这些问题常常会使绘图者束手无策。分析这些问题出现的原因以及研究解决这些问题的方法显得尤为重要。本人根据多年的实践经验,对初学CAD者在绘图中可能出现的问题进行概括与总结,从而为他们提供了解决的方法,以便提高图纸的质量及作图效率。     

AutoCAD在模具设计中的应用

AutoCAD作为目前应用最为广泛的CAD软件,已经渗透到了机械、电子、航空、船舶、建筑、水利、服装等诸多领域,但在模具设计中的应用仍不多见。文章以一实际零件为例,讲述了如何应用AutoCAD2007中文版快速进行冲压模具零件图和装配图的绘制。     

浅谈AutoCAD的绘图习惯及技巧

1，绘图比例和尺寸标注比例因子的设置 绘制二维图形，经常要确定绘图的比例，通常先按1：1的比例绘制，然后使用比例（Scale）命令进行比例缩放，输入比例值。如，要求以1：2的比例绘图。输入1／2，或者0.5。     

AutoCAD与Office之间的巧用

AutoCAD尽管有强大的图形功能，但表格处理功能相对较弱，而Excel的绘制表格功能却是非常完善的。Word文档制作中，往往需要各种插图，但Word绘图功能有限，而AutoCAD是专业绘图软件，很适合绘制比较复杂的图形。基于以上等原因，如果能将AutoCAD与Office软件结合起来应用，那么许多难题都将迎刃而解，在AutoCAD中绘图速度将大大提高，在Office中文档制作将更加方便。     

AutoCAD在公路路线绘图中的应用——利用AutoCAD绘制公路缓和曲线及里程桩的标注和文字注解

近年来AutoCAD技术飞速发展,在公路设计中的应用十分广泛,文章就绘制公路缓和曲线及里程桩的标注和加文字注解等几方面进行阐述。     

Auto CAD在铸造工艺中的应用

铸造领域与计算机辅助设计技术结合不断发展及Auto CAD的不断改良,使得Auto CAD功能更加强大。文章介绍Auto CAD技术在铸造工艺设计中的应用,综合评述了铸造工艺Auto CAD研究的内容和现状,以及如何利用Auto CAD来完成铸造的过程。     

Auto CAD在铸造工艺中的应用

铸造领域与计算机辅助设计技术结合不断发展及Auto CAD的不断改良,使得Auto CAD功能更加强大。文章介绍Auto CAD技术在铸造工艺设计中的应用,综合评述了铸造工艺Auto CAD研究的内容和现状,以及如何利用Auto CAD来完成铸造的过程。     

浅谈高职高专《Auto CAD建筑绘图》的教学方法

针对高职高专《Auto CAD建筑绘图》教学过程中存在的问题,从课堂管理、目标教学、项目教学、人文教学、信息化教学、对比教学、"授"后服务和按进度考核8个方面介绍教学方法。     

Alternative Approaches of Physical Input–Output Analysis to Estimate Primary Material Inputs of Production and Consumption Activities

In the last few years, a number of studies have been presented that link material flow accounting and input–output analysis (based on monetary input–output tables) for the calculation of direct and indirect resource inputs for production and consumption activities. The compilation of the first physical input–output tables for some European countries in the 1990s opened new possibilities for linking physical accounting and input– output analysis. Physical input–output analysis has so far only been applied for selected materials, but it has not been used for comprehensive assessments of material requirements of economic activities. In this paper, possibilities and limits of this new input–output approach are clarified. We present and discuss a procedure similar to monetary input– output analysis and develop an alternative approach to account for primary inputs and waste otherwise not included in the analysis. Based on aggregated input–output tables for Germany, we present numerical examples intended to compare the alternative approaches of physical input–output analysis.     

《AutoCAD机械制图》课程教学改革效果分析

以高职院校培养技术型人才的导向下,针对机电一体化专业人才培养的重点,需要熟练掌握Auto CAD机械制图的软件使用。主要通过教-学-做-测-评的教学模式,采用10+50+40(10%平时考勤+50%平时作业、课堂考核+40%期末考核)的考核方式进行教学改革,重视学生阶段性知识点的掌握情况,以学生平时反馈的问题对课堂教学进行修正,反馈问题,解决问题,让学生真正成为教学的主体。经过实践,学生均在绘图速度和分析图纸方面能力有明显的提高。     

浅谈铸造工艺Auto CAD的特点及应用

铸造工艺Auto CAD是指从零件图输入到铸件工艺图输出之间应完成的全部工艺设计工作。主要包括铸件的分型面、加工余量、拔模斜度、芯头、浇注系统、冒口及各种工艺符号的设计。本文简介了Auto CAD特性,分析了铸造工艺Auto CAD的特点及应用,最后还进行了案例分析,具有一定的参考价值。     

A Note on Qualitative Input–Output Analysis

The paper discusses qualitative input–output methods. It is shown that information is lost. Because the binary relationship constructed by qualitative methods is not transitive, the model lacks economic consistency. Qualitative methods are tending to become more sophisticated, but some problems of economic interpretation are raised.     

An input–output virtual laboratory in practice – survey of uptake,usage and applications of the first operational IELab

ABSTRACT

The Industrial Ecology Virtual Laboratory (IELab) is a collaborative cloud-computing platform for compiling large-scale, high-resolution, enviro-socio-economic accounts based on multi-region input–output tables and for conducting integrated sustainability assessment projects. These include, for example, assessments of biofuels and low-carbon construction materials or high-resolution waste modelling. This contribution provides a structured review of IELab applications that were published in either peer-reviewed journal papers or in the form of conference proceedings. The main research question posed is ‘What are the specific features of IELab that were used in the research and could the research have happened without them?’ It is investigated whether the IELab has actually and truly enabled new research. A detailed analysis of IELab characteristics and their usage is presented. The results can help with the design of new research projects and inform existing and prospective users of the IELab about the options for academic research and practical applications.     

Impact of Carbon Dioxide Emissions Reduction on the Austrian Economy

A linked econometric input–output (IO) model of the Austrian economy with an energy block is used in this study to assess the sectoral effects of carbon dioxide emissions reduction. The energy block and the other commodities are linked by a partitioned IO model. Energy demand is described using aggregate energy demand equations, by activities and subdemand systems of the translog type for different fuel types. The conversion of energy is modelled using an IO model of the energy sector. Measures for carbon dioxide reduction from detailed expert studies are introduced in the energy model and in the econometric model. The primary impacts are on energy demand, fuel shares and investment in new energy technologies. The simulation results of the partitioned IO model show different impacts on gross output, GDP and employment.     

Bias and Sensitivity of Multipliers

Multipliers measure the derivatives of endogenous variables with respect to exogenous shocks and are functions of the structural parameters of an economic model. Substitution of the structural parameter estimates yields a so-called derived estimate for a multiplier or any reduced-form parameter. Derived estimates are biased. This paper presents first-order approximations to the biases and sensitivities of multipliers. The good performance of a flawed formula in input–output analysis is illuminated.