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电源技术 使用新电源模块改进表面贴装可制造性
The latest generation of Texas Instruments (TI) boardmountedpower modules utilizes a pin interconnect technologythat improves surface-mount manufacturability.These modules are produced as a double-sided surfacemount(DSSMT) subassembly, yielding a case-less constructionwith subcomponents located on b ...
机械电子 SMT生产线贴片机负荷均衡优化
摘要：采用表面组装技术（surface mountt echnology,SMT）进行印制板级电子电路组装是当代组装技术发展的主流。典型的SMT生产线是由高速机和多功能机串联而成，印制电路板（printed circuit board,PCB）上的元器件在贴片机之间的负荷均衡优化问题是SMT生产调度的关键问题。以使贴片时间与更换吸嘴时间之和最大的工作台生产 ...
机械电子 贴片胶与滴胶工艺
表面贴片胶(SMA,surface mount adhesives)用于波峰焊接和回流焊接，以保持组件在印刷电路板(PCB)上的位置，确保在装配线上传送过程中组件不会丢失。PCB装配中使用的大多数表面贴片胶(SMA)都是环氧树脂(epoxies)，虽然还有聚丙烯(acrylics)用于特殊的用途。在高速滴胶系统引入和电子工业掌握如何处理货架寿命相对较短的产品 ...
可编程逻辑 多层印制板设计基本要领
【摘要】本文结合作者多年的印制板设计经验，着重印制板的电气性能，从印制板稳定性、可靠性方面，来讨论多层印制板设计的基本要求。【关键词】印制电路板；表面贴装器件；高密度互连；通孔【Key words】Printed Circuit Board；Surface Mounting Device；High Density Interface；Via一．概述印制板（PCB－Printed Circuit ...
可编程逻辑 计算FR4上的差分阻抗(PDF)
Calculation of the Differential Impedance of Tracks on FR4 substrates
There is a discrepancy between calculated and measured values of impedance for differential transmission lineson FR4. This is especially noticeable in the case of surface microstrip configurations. The anomaly is shown tobe due to ...
游戏 国外游戏开发者杂志2000年第八期配套代码
国外游戏开发者杂志2000年第八期配套代码，包括Brian Sharp的implicit-surface fluid的例子代码，例子中使用了Lander的动画库
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东滕网站源码，漂亮的界面，基本网页功能设计，聊天室- East clears out the website source code, attractive contact surface, basic homepage functional design, chatroom ,ASP,编程网站/Program Web Site 【上载源码成为会员下载此源码】【成为VIP会员下载此源码】 ...
系统设计方案 This was the public transportation inquiry system software engineering design documents, including t
This was the public transportation inquiry system software engineering design documents, including the demand analysis, the outline design, the contact surface design and so on a series of designs documents, made the comprehensive analysis to the public transportation systems engineering to design , ...
系统设计方案 This was the public transportation inquiry system software engineering design documents, including t
This was the public transportation inquiry system software engineering design documents, including the demand analysis, the outline design, the contact surface design and so on a series of designs documents, made the comprehensive analysis to the public transportation systems engineering to design , ...
系统设计方案 This was the public transportation inquiry system software engineering design documents, including t
This was the public transportation inquiry system software engineering design documents, including the demand analysis, the outline design, the contact surface design and so on a series of designs documents, made the comprehensive analysis to the public transportation systems engineering to design , ...