One of the strongest trends in the design and manufacture of modern electronics packages and assemblies is the utilization of surface mount technology as a replacement for through-hole tech nology. The mounting of electronic devices and components onto the surface of a printed wiring board or other substrate offers many advantages over inserting the leads of devices or components into holes. From the engineering viewpoint, much higher lead counts with shorter wire and interconnection lengths can be accommo dated. This is critical in high performance modern electronics packaging. From the manufacturing viewpoint, the application of automated assembly and robotics is much more adaptable to high lead count surface mounted devices and components. Indeed, the insertion of high lead count parts into fine holes on a substrate might often be nearly impossible. Yet, in spite of these surface mounting advantages, the utilization of surface mount technology is often a problem, primarily due to soldering problems. The most practical soldering methods use solder pastes, whose intricacies are frequently not understood by most of those involved in the engineering and manufacture of electronics assemblies. This publication is the first book devoted exclusively to explanations of the broad combination of the chemical, metallurgical, and rheological principles that are critical to the successful use of solder pastes. The critical relation ships between these characteristics are clearly explained and pre sented. In this excellent presentation, Dr. Hwang highlights three impor tant areas of solder paste technology.
The Only Book You Will Ever Need for Managing PCOS -- Completely Revised and Updated What exactly is PCOS? What are the signs and symptoms? How is the diagnosis confirmed? What causes it? And most importantly, what can you do about it? If you’ve been diagnosed with polycystic ovarian syndrome (PCOS) or suspect you have it, and you’re looking for a way to manage your condition, you’ve come to the right place. In this newly revised edition of Living Well with PCOS, Dr. Jennie Brand-Miller and PCOS experts Drs. Nadir Farid and Kate Marsh address the root cause of PCOS -- insulin resistance -- and show you how eating a low-GI diet can help alleviate even your most troublesome symptoms, including weight gain, infertility, unsightly hair growth, irregular cycles, and fatigue. This all-new second edition features: The latest up-to-date research on PCOS and its treatment New quick-and-easy low-GI recipes Low-GI kick-start menus -- with vegetarian and gluten-free options Easy-to-use tables of GI values Tips for a more active lifestyle Real-life stories from women who have used the GI to successfully combat PCOS
Introduction Advanced Surface Mount Technology and Die Attach Techniques Solder Material Soldering Chemistry Solderability Microstructure of Solders Aqueous-Cleaning Manufacture No-Clean Manufacture Protective and Reactive Atmosphere Soldering Surface Mount Fine Pitch Technology Surface Mount-BGA/PAC Technology Soldering Methodology and Equipment Soldering and Soldering Related Issues Strengthened Solders Lead-Free Solders Solder Joint Failure Mode Solder Joint Failure Assessment-Case Studies Solder Joint Quality and Reliability New and Emerging Specifications and Standards Future Trends.
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