Another One Bites The Dust
Jun 29, 2009
As more individual halogenated compounds become restricted, it becomes more and more likely that electronics companies will just restrict ALL halogenated compounds. The reason is that it is very costly to test for specific compounds but there are low cost tests to look at the elemental level (i.e. look...
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Answers to “Evaluating Someone for DOE etc”
Jun 26, 2009
Folks, I posted this a while back. The solutions are in red. Suppose you need to select a consultant or verify the qualifications of some of your staff to perform designed experiments (DOE), statistical process control (span...
每天都有新问题；Everyday, there is a new question
Jul 1, 2009
最近，都会听到一些友人在说自己公司的问题（或是过去老东家），行业的问题；每天的朝闻天下或是第一时间新闻联播中，说到祖国各种事件/现象/问题时，也揪着我的心；金融危机以来，已经有几个不同行业的美国老人，和我谈起美国的问题，以及他们对这个国家的担忧了。
就像今天，这个“资深”的，受过高等教育的本土美国人，忧心肿肿的用各种经济数据，历史发展进程，他个人对整个美国政商关系的理解，银行和政府关系的理解等，表示出自己对这个国家未来的担忧。我没有他了解这个国家，也没有调查，“没有调查就没有发言权”，所以只听不说。其实，在中国，我们每天从各种舆论媒体中听到看到的，生活中感受到的，也会让我们茶余饭后的话题围绕什么“大学生就业问题”，“城乡医疗保障问题”，“政府的4万亿刺激经济计划实施问题”，等等等等这些关系到国计民生的大事上……美国人，谈论和担心自己国家的问题；中国人，也常说“中国还是有很多问题啊”。不过都是好事，起码证明国人关心自己的国家，在思考和讨论中尝试解决，if that’s possible.
或许，每个国家都有自己的问题，和在国际中的扮演的角色；每个公司有自己的问题，以及在行业中/甚至社会中的地位；每个家庭有自己的问题，每个人也有自己的问题吧。span...
Share Your Solar Images
Jun 29, 2009
Do you have interesting pictures of a solar installation, solar cells, or solar module assembly that you’d like to share? Do you have a really specialized application that you want the world to learn about? Click...
Au/Sn Perfected
Jun 1, 2009
Fact: To achieve a strong, reliable solder joint, it is important to remove all oxides from the substrate as well as the solder. Generally this is done using a compatible flux. span style="font-size: 10pt;...
Inextricably Intertwined
Jun 29, 2009
According to the Encarta Dictionary that popped up on the left side of my screen a moment ago, “inextricably” is defined as: 1) impossible to get free from p class="MsoNormal" style="margin: 0in...
Mixed Alloy Wetting for SAC BGA Assembly Using Sn63 Solder Paste
Jun 18, 2009
Have you ever wondered about what happens to a Pb-free Ball-Grid Array (BGA), with Tin/Silver/Copper (SAC) spheres in a Tin/Lead (Sn/Pb) process? Well, after some recent testing, I can share my results with you. <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/_WedqT28sPA&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/_WedqT28sPA&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true"...
Dispelling 10 Myths about Nitrogen Reflow (part II)
Jul 2, 2009
Dispelling 10 Myths about Nitrogen Reflow (part II). ...and we’re back with more nitrogen and inert soldering myths. Myth 6: "I turned on the nitrogen flow, so my oven is now inerted" Fact: It takes time to purge an oven down (and yes, I have an equation to determine this)....
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