CAD软件接口技术及实现

介绍了ＣＡＤ软件接口原理和ＤＸＦ数据交换接口。并以ＢＹＬＣＡＤ（白玉兰ＣＡＤ）为例,提出一种ＤＸＦ数据交换接口的实现方法,用以实现不同ＣＡＤ软件之间的图形数据的交换。     

对柯达CAR接口模块的分析

对柯达ＣＡＲ接口模块的分析西安电子科技大学舒炳珍图２ＣＡＲ接口模块的连接一、概况ＣＡＲ（计算机辅助检索）接口模块是柯达公司为计算机终端与ＩＭＴ－１５０缩微影像终端机（以下简称１５０机）单向通讯而设计的通讯模块，如图１所示。该模块一端通过ＲＳ－２３２Ｃ...     

包装CAD与AUTO CAD系统的接口技术

对ＡＵＴＯＣＡＤ系统的各种接口方式进行了分析，研究了各种接口方式的应用范围、特点以及相互间的关系、使包装ＣＡＤ系统与ＡＵＴＯＣＡＤ系统的接口问题得到较好解决。     

基于环球网的CAD/CAM技术

提出了开发基于Ｉｎｔｅｒｎｅｔ（中文意为环球网）的ＣＡＤ／ＣＡＭ系统的思想，并利用Ｉｎｅｔｅｒｎｅｔ中应用最普遍的ＷＷＷ服务中的上应网关接口成功地开发了基于Ｉｎｔｅｒｎｅｔ的ＣＡＤ／ＣＡＭ系统。     

AGC2075＋图形板在激光／声探潜中的应用

本文简要介绍了ＡＧＣ２０７５＋图形板的结构和性能特点，着重叙述了如何应用图形处理板中ＴＩＧＡ软件接口进行图形显示的软件设计。     

基于数据库的机床卡盘参数化零件设计系统的实现

介绍了ＡｕｔｏＣＡＤＦｏｒＷｉｎｄｏｗ下,一种基于数据库的卡盘参数化零件设计方法,分析了Ｆｏｘ系列数据库／表的结构,了用Ｃ语言进行参数化零件设计,ＡｕｔｏＣＡＤ的界面设计,以及Ｆｏｘ系列数据库的C语言操作通用接口设计的方法.     

基于STEP标准的CAD与CAPP信息集成

说明了基于标准数据存取接口生成ＳＴＥＰ中性文件实现数据交换的基本思路，提出了一个ＣＡＤ与ＣＡＰＰ系统通过ＳＴＥＰ中性文件实现信息集成的方案及一个完整的零件信息模型最后用一个基于ＡｕｔｏＣＡＤ的特征造型系统给出了实施范例。     

Magnan设计出适应新规格数字传输的同轴信号线

新规格的ＤＶＤ－ＡＵＤＩＯ以及ＳＡＣＤ的采样频率,由ＣＤ－ＤＡ的４４．１ｋＨｚ一下子就提升到１９２ｋＨｚ,理论上高频的重播上限达到了８６ｋＨｚ,就算录音时的高频截止频率不会放到这么高,但是２４ｂｉｔ数字传输的字节量已经非常大了,所以现在ＳＡＣＤ使用ＤＳＤ制式的数字传输界面没有定下来,金嗓子使用的是ＲＪ４５接口的１００Ｍ线,但也是它自家形式而已。不过对于ＤＶＤ－ＡＵＤＩＯ现有的数据量,有“先知先觉”的线厂已经开始为新规格开发新材料的数字传输线了。很显然厂家认为,ＤＶＤ Ａ／Ｖ兼容机本身的音频播放肯…     

工程制图绘图练习智能化多媒体CAI

将多媒体和智能技术应用到ＣＡＩ软件中是当今的发展趋势。利用ＶＢ与ＡｕｔｏＣＡＤＲ１４的接口ＡｃｔｉｖｅＸＡｕｔｏｍａｔｉｏｎ,实现了“工程制图”ＣＡＩ软件中绘图环境,提供了补图题、二求三题目的的智能判断;另外,利用多媒体技术,可随时为学生提供形象的三维模型演示。     

用于容栅式数显尺的智能接口设计

本文介绍了采用ＡＴ８９Ｃ２０５１单片机与容栅式数显尺相连接的智能化接口的硬件才软件设计方法。     

采用180nm CMOS工艺的USB2.0端点控制器(英文)

采用Verilog硬件描述语言设计了用于USB2.0设备控制中的端点控制器.端点数可由用户配置最多达16个.支持8位/16位USB接口,并支持8位/16位/32位AHB或8051接口以及32位的DMA接口.该端点控制器采用180nm CMOS工艺进行流片,所有功能均通过了测试.     

Development and calibration of differential mobility analyzer for 20 to 80 nm particles under low pressure conditions

The vienna-type differential mobility analyzer (DMA) was developed for the measurement of wide-range nm-sized particles under low-pressure conditions (2.9-8 kPa) with the faraday cup electrometer (FCE). The length, inner and outer diameter of DMA are calculated as a function of flow rate, applied voltage, pressure, and particle diameter to avoide breakdown in DMA. The algorithm for the diffusion transfer function of the DMA was successfully developed and verified by comparing the numerical and experimental results. The DMA was calibrated via the tandem DMA (TDMA) method which using two DMA in parallel. The inversion algorithm was applied to the size distribution obtained from the current of the FCE. The calibration experiment was performed with 1% NaCl particles under atmospheric and low-pressure conditions. The calibration result showed that the development of the DMA was successful as it was able to measure 20- to 80-nm paricles under low-pressure conditions with various flow rates (0.1-0.5 l/min).     

黏弹阻尼层共固化复合材料不同温度下的阻尼性能

采用共固化工艺制备了以丁腈橡胶为黏弹性阻尼层的复合材料 , 应用动态机械分析仪(DMA)测定了该材料损耗因子的温度谱 , 并对不同温度环境下该材料的阻尼性能和阻尼机制进行了分析。结果表明 : 当温度处于阻尼层玻璃态和高弹态区时 , 共固化复合材料损耗因子较小且随温度变化不大 ; 当温度处于阻尼层黏流态区时 ,共固化复合材料的损耗因子迅速增加到最大值后变小 , 最大损耗因子为 19. 2 % , 约为未插入黏弹阻尼层复合材料的 13倍; 共固化过程中阻尼层损耗因子的减小 , 使共固化复合材料的阻尼性能降低 , 并在阻尼层的黏流态区其损耗因子明显小于预报结果 ; 界面阻尼的影响提高了共固化复合材料的阻尼性能 , 并在阻尼层的玻璃态区其损耗因子大于预报结果。      

A fast data acquisition system for PHA and MCS measurements

A microprocessor controlled data acquisition system for pulse height analysis and multichannel scaling is described. A 4K×24 bit static memory is used to obtain a fast data acquisition rate. The system can store 12 bit ADC or TDC data within 150 ns. Operating commands can be entered via a small keyboard or by a RS-232-C interface. An oscilloscope is used to display a spectrum. The display of a spectrum or the transmission of spectrum data to an external computer causes only a short interruption of a measurement in progress and is accomplished by using a DMA circuit. The program is writtenin Modular Pascal and is divided into 15 modules. These implement 9 parallel processes which are synchronized by using semaphores. Hardware interrupts from the data acquisition, DMA, keyboard and RS-232-C circuits are used to signal these processes.     

纤维热氧-接枝处理与基体改性对CF/VE复合材料力学性能的影响

针对碳纤维增强乙烯基酯树脂(CF/VE)复合材料界面性能薄弱的问题,通过热氧-接枝的方法对碳纤维表面进行改性,通过添加偶联剂改性树脂,并采用真空辅助成型工艺制备了CF/VE复合材料。通过纤维扫描电镜(SEM)表征和CF/VE复合材料力学性能测试、动态力学测试、界面粘结参数计算以及界面的微观表征验证改性方法的效果。SEM测试表明改性后纤维比表面积和粗糙度提高;TGA测试表明碳纤维氧化温度大于210℃,且氧化温度在600℃时,CF/VE复合材料综合性能最佳;CF/VE复合材料界面性能随隅联剂质量浓度的增大先提高后降低,且在其质量浓度为1%时,层间剪切强度最大,相对于未改性CF/VE复合材料的提高了74.3%;动态力学性能测试(DMA)表明改性CF/VE复合材料的玻璃化转变温度Tg较未改性的提高了约10℃;界面粘结参数A和α的定量计算表明改性CF/VE复合材料界面性能得到较大改善。     

DMA transfer method for wide-range speed and frequency measurement

A frequency measurement method based on both pulse counting and time measurement during a constant sampling time is presented. The content of a free-running timer is transferred by a direct memory access (DMA) to a memory location after each rising edge of an input pulse, so the DMA transfer counter serves as a pulse counter. Several sources of measurement errors are discussed in detail. The DMA method is suitable for real-time speed control system with an integrated DMA controller     

复合硫化剂对氟橡胶/硅橡胶共混物结构和性能的影响

分别采用过氧化二异丙苯(DCP)/三烯丙基异氰脲酸酯(TAIC)、双酚AF/苄基三苯基氯化磷(BPP)/DCP、3#硫化剂/DCP三种复合硫化剂硫化氟橡胶/硅橡胶共混物。研究了不同复合硫化剂对氟橡胶/硅橡胶共混物的硫化特性、力学性能、耐热老化性能、耐油性能和低温性能的影响,采用动态热机械分析(DMA)、热重分析(TG)和扫描电镜(SEM)方法对氟橡胶/硅橡胶共混物进行表征。结果表明,采用DCP/TAIC硫化的氟橡胶/硅橡胶共混物具有良好的综合物理力学性能。DMA分析表明,DCP/TAIC硫化的共混物中氟橡胶相和硅橡胶相的Tg最高,TG分析表明,DCP/TAIC硫化的共混物具有良好的热稳定性。SEM照片表明,DCP/TAIC硫化的共混物界面结合作用较强。     

用CCD测量光学系统OTF的研究

线性光学系统的光学传递函数可由线扩散函数的付立叶变换求出。本文研究了用电荷耦合器件测量光学系统OTF的系统,用CCD作为光电转换器件,对CCD接收到的LSF的光强信号进行视频放大,采样一保持、A/D转换接口到计算机,可方便而精确地测得光学系统的OTF。为了避免采用高速A/D和DMA方式,对CCD的信号处理采用分时处理。用CCD测量MTF的误差为3%,不重复性为1%,能在2分钟之内测试出物镜的10种空间频率的MTF值。     

704胶胶结界面pH值对玻璃纤维复合铝箔动态模量的影响

采用均匀设计法,以盐酸和氢氧化钠为酸碱处理剂,制备pH值在1.90~13.70的玻璃纤维与铝箔表面。以704硅橡胶作为粘结剂,将处理过的玻璃纤维与铝箔在140℃热压60s制成玻璃纤维复合铝箔材料。用动态热机械性能测试仪(DMA)考察胶结界面pH值在30~400℃下,玻璃纤维复合铝箔动态模量随温度的变化情况。结果表明:当玻璃纤维界面pH值呈中性,铝箔界面pH值呈弱碱性时,复合材料的动态模量比其他胶结界面pH值都大;且随着温度的增加,其动态模量相应增加,并在200℃时达到最大值。扫描电镜(SEM)实验证明,在此条件下制备的复合材料胶结界面更为紧密,且玻璃纤维丝有部分嵌入铝箔表面层结构。     

Speciation of dimethylarsinous acid and trimethylarsine oxide in urine from rats fed with dimethylarsinic acid and dimercaptopropane sulfonate

Speciation of arsenic in urine from rats treated with dimethylarsinic acid (DMA(V)) alone or in combination with dimercaptopropane sulfonate (DMPS) were studied. Methods were developed for the determination of the methylarsenic metabolites, especially trace levels of dimethylarsinous acid (DMA(III)) and trimethylarsine oxide (TMAO), in the presence of a large excess of DMA(V). Success was achieved by using improved ion-exchange chromatographic separation combined with hydride generation atomic fluorescence detection. Micromolar concentrations of DMA(III) were detected in urine of rats fed with a diet supplemented with either 100 microg/g of DMA(V) or a mixture of 100 microg/g of DMA(V) and 5600 microg/g of DMPS. No significant difference in the DMA(III) concentration was observed between the two groups; however, there was a significant difference in TMAO concentrations. Urine from rats fed with the diet supplemented with DMA(V) alone contained 73 +/- 30 microM TMAO, whereas urine from rats fed with the diet supplemented with both DMA(V) and DMPS contained only 2.8 +/- 1.4 microM TMAO. Solutions containing mixtures of 100 microg/L DMA(V) or TMAO and 5600 microg/L DMPS did not show reduction of DMA(V) and TMAO. The significant decrease (p < 0.001) of the TMAO concentration in rats administered with both DMA(V) and DMPS suggests that DMPS inhibits the biomethylation of arsenic.