The use of abradable and rub tolerant polymer seals to reduce leakage between rotating and stationary members in centrifugal compressors and steam turbines has increased over the years. Abradable materials such as mica-filled tetrafluoroethylene (TFE), nickel graphite, and aluminum alloy containing silicon/polyester are the most commonly used and have gained acceptance in the marketplace. This ...

  Background: Fractures of the femoral shaft are mostly the result of high-energy accidents that also cause multiple trauma injuries, in particular ipsilateral knee and hip injuries. The purpose of this study was to investigate the incidence of injuries associated with femoral shaft fractures and how many of them were undetected. Methods: We studied 148 patients (150 femoral shaft fractures) wi...

This article studied static deflection, natural frequency and nonlinear vibration of a clamped-clamped microbeam under discontinues electrostatic actuation. The electrostatic actuation was induced by applying AC-DC voltage between the microbeam and electrode plate. In contrast to previous works, it was assumed that length of the electrode plate was smaller than that of the microbeam. In additio...

This paper concerns itself with the performance of deflection routing in optical burst-switched networks based on Just-Enough-Time (JET) signaling. Generally speaking, buffer requirement is not vital for JET-based optical burst switching (OBS). However, if deflection routing is enabled, optical buffers are necessary to solve the insufficient offset time problem. A variant of priority queuing mo...

In this paper, we identify the Young’s modulus and residual stress state of a free-standing thin aluminum membrane, used in MEMS radio-frequency (rf) switches. We have developed a new methodology that combines a membrane deflection experiment (MDE) and three-dimensional numerical simulations. Wafer-level MDE tests were conducted with a commercially available nanoindenter. The accuracy and usefu...

in this study, we investigated variations of the angle between neck and shaft of femur after amputation of tigh above the knee. in amputated tigh the angle between neck and shaft of the femur is decreased than normal (nearly 90° degrees) (coax vara). the angle of the normal femur usually increases due to weight bearing (coax valga). in the patients that both tighs have been amputated the change...

This paper describes the experimental study of the shaft oil feed mechanism of a rotary compressor. The oil contained in the shaft in which an oil pump is inserted is fed to the respective sliding surfaces of the subbearing section, eccentric section and main bearing section of the shaft by centrifugal force of shaft rotation. The oil feed pressure of shaft rotation is approximately 0.1 kg/cm2 ...

A non-circular gear train has the advantages of compact structure, easy to achieve dynamic balance, and is often used drive an end-effector complex trajectory attitude. The gearbox key component train, which requires high precision each wheel shaft hole its relative position. Conventional methods use numerical control process tools with train. processing cost too high, there are some problems, ...