This study presents a novel design and fabrication process to realize an on-chip micro ball bearing. The ball bearing consists of a polymer-Si-polymer outer-race (stator), and a suspended polymer-Si-polymer inner-disk (rotor) supported by polymer micro-balls. The outer-race and inner-disk are demolded from silicon mold, which is patterned by wet isotropic etching on double-polished 525 μm-thick silicon wafer. The liquid phase photocurable polymer balls are dispensed by commercial dispenser with a hundred micrometer diameter tip and in-situ self-assembled in buffer liquid. After photocurable polymer solidified by UV-curing, the polymer balls are confined between the outer race and inner disk. Note the ball bearing is fabricated on a single wafer with no assembly required.
As the buildings of Taiwan have been stepping towards the aging stage, the act of after-use maintenance of buildings gradually becomes a mainstream movement. After the serious fire of Welcome Restaurant happened in 1995, Taiwan government has been comprehensively implementing Public Safety Inspection Declaration System for the refuge facilities and the constructed facilities of buildings. Ever since the Chi-Chi Earthquake happened in 1999, the government forcibly and positively conducts mandatory inspection and renovation of the seismic resistance of public buildings in order to reinforce the public safety. Through on-the-spot survey, data analysis and review of local and foreign references, this study investigates the current implementation and the performance of the several mandatory and encouraging improvement systems positively executed in the buildings of Taiwan. The contents of this paper are divided into three parts: 1) Public safety inspection declaration; 2) Diagnosis, inspection and renovation of seismic resistance of buildings; 3) Improvement of obstacle-free facilities.
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