Bøger af Douglas Brooks

- Introduces significant aspects of traditional Japanese boatbuildingdesign, workshop and tools, wood and materials - Introduces joinery and fastenings, propulsion, ceremonies, and the apprenticeship system - The only available English-language documentation of these traditional boats and the few craftspeople left able to build them With Japan's unprecedented modernization in the last century, the demand for traditional boats (wasen) faded, leaving the last generation of boatbuilders with no one to teach. This is the story of the author's apprenticeships with five Japanese masters to build their unique and endangered traditional watercraft. Brooks was the sole apprentice for each craftsman, and worked under a time-honored system in which apprentices first swept floors and sharpened tools, learning chiefly by observation with only limited direct instruction. The resulting book is part ethnography, part instruction, and part the personal story of a wooden boatbuilder fueled by a passion to preserve a craft tradition on the brink of extinction. It fills a large and long-standing gap in the literature on Japanese crafts, and will be of interest to boatbuilders, woodworkers, and all those impressed with the marvels of Japanese design and workmanship.

A very important part of printed circuit board (PCB) design involves sizing traces and vias to carry the required current. This exciting new book will explore how hot traces and vias should be and what board, circuit, design, and environmental parameters are the most important. PCB materials (copper and dielectrics) and the role they play in the heating and cooling of traces are covered. The IPC curves found in IPC 2152, the equations that fit those curves and computer simulations that fit those curves and equations are detailed. Sensitivity analyses that show what happens when environments are varied, including adjacent traces and planes, changing trace lengths, and thermal gradients are presented. Via temperatures and what determines them are explored, along with fusing issues and what happens when traces are overloaded. Voltage drops across traces and vias, the thermal effects going around right-angle corners, and frequency effects are covered. Readers learn how to measure the thermal conductivity of dielectrics and how to measure the resistivity of copper traces and why many prior attempts to do so have been doomed to failure. Industrial CT Scanning, and whether or not they might replace microsections for measuring trace parameters are also considered.