Abstract Silicon wet bulk micromachining is the most widely used technique for fabrication of diverse microstructures such as cantilevers, cavities, etc. in laboratory well industry micro-electromechanical system (MEMS) application. Although, increasing throughput remains inevitable, and can be done by etching rate. Furthermore, freestanding structure release time reduced improved undercutting ...

The paper proposes a method of cutting by generating spur gears using rack cutter with modified geometry. analytical equations the tooth profile rack-gear are deduced, both for involute zone and filleting region, based on remark that is envelope successive positions tool. undercutting radius obtained from system transcendental which requires numerical solving it. Compared to standard profile, d...

The application of mine method shallow burying and undercutting in subway tunnel engineering is becoming more significant, but also has its own limitations: the can easily cause subsidence nearby surface, there a security threat to surrounding buildings, instability inside, easy collapse construction tunnels, endangering safety, so ensuring safety becomes key project. By combining examples Heyi...

Seventy-eight patients who had been operated on for bony entrapment of lumbar nerve roots were studied in an attempt to define the clinical syndrome, and to assess the results of a new technique of decompression which preserves spinal stability. The mean age of the patients was 45 years and 28 of them had previously undergone spinal operations. Pain in the leg was the predominant symptom, with ...