In order for the rapidly emerging field of MicroElectroMechanical Systems (MEMS) to meet its extraordinary expectations regarding commercial impact, issues pertaining to how they fail must be understood. We identify failure modes common to a broad range of MEMS actuators, including adhesion (stiction) and friction-induced failures caused by improper… (More)
1 ABSTRACT A new type of surface micromachined ratcheting actuation system has been developed at the Microelectronics Development Laboratory at Sandia National Laboratories. The actuator uses a torsional electrostatic comb drive that is coupled to an external ring gear through a ratcheting scheme. The actuator can be operated with a single square wave, has… (More)
Managing and supporting SAS system and JMP software at a large organization is a daunting process. Many large organizations began using SAS system software in the 1970's and greatly expanded usage in the 80's and 90's. Unfortunately, for many SAS software client sites, increased usage caused the evolution of a byzantine maze of licensing agreements… (More)
This paper describes the design and design issues associated with silicon surface micromachined device design 1. Some of the tools described are adaptations of macro analysis tools. Design issues in the microdomain differ greatly from design issues encountered in the macrodomain. Microdomain forces caused by electrostatic attraction, surface tension, Van… (More)
We describe a patient with AIDS who presented with an acute encephalitis caused by infection with varicella-zoster virus. The hemorrhagic, necrotizing encephalitis had an unusual MR appearance, with innumerable discrete, small, targetlike lesions in the right cerebral hemisphere, which were coalescent in the posterior temporal, parietal, and occipital… (More)
Hemiatrophy caused by linear scleroderma is a race clinical entity of unknown etiology. We present a patient with an inflammatory myopathy in hemiatrophy resulting from linear scleroderma.