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Woman who gouged out boy's eyes in China suspected to be ...

There was news, now the world really is a complete world, information can be seen, and I feel sad for Chinese children, being cut eyes, it's really very painful, my heart is very painful, want to be able to a little less this kind of problem again ([url=h ttp://pcb.hqew.net /?s=544864]PCB[/ur l])  (Sep 3, 2013 | post #1)

Greeneville, TN

Copper PCB design

Copper PCB design( http://pcb.hqew.ne t/?s=544864&#6 5289; Circuit design of the printed circuit board, the designer will meet the problem of large area PuTong basically. The widespread application of copper commonly used on the printed circuit board has two kinds. a Kind is a large copper, copper is a kind of grid. Its effects are different: one for heat dissipation, one for reducing interference shielding (and possibly some other aspects of the role). It is a big copper sheet, or copper clad grid? Depending on the board to the specific design. But based on the system board factors to consider, if the Performance is not particularly need coated mesh copper suggested that designers should reply to copper sheet. Because there will be a small gap on copper mesh, these small gaps in the production of PCB Process, during the etching process of a certain influence on the quality of the PCB, thereby, in the production of PCB, the engineering data processing link, usually between the small Gap is removed. But it is a pity that the existing CAM software basically can't rid of 100% of the small gap, which requires engineers to operate manually, thus greatly increased Workload, reduce the efficiency, prolong the process of PCB. Designers at design time, therefore, if the lingering effects of the plate velocity factors into consideration, the PCB manufacturing process will be optimized, the designer's research and development cycle.  (Sep 3, 2013 | post #1)