نتایج جستجو برای: gate valve cover
تعداد نتایج: 259631 فیلتر نتایج به سال:
BACKGROUND Post-procedural aortic regurgitation (AR) has been described in a large number of patients receiving transcatheter aortic valve implantation (TAVI). OBJECTIVE The aim of this study was to examine the intraoperative 2-dimensional (2D) and 3-dimensional (3D) echocardiographic features of the aortic valve associated with significant post-procedural paravalvular AR. METHODS A total o...
Issue 6 2010 Power Electronics Europe www.power-mag.com Power electronics systems are commonly used in motor drive, power supply and power conversion applications. They cover a wide output power spectrum: from several hundred watts in small drives up to megawatts in wind power installations or large drive systems. Inside the system the gate driver circuit with its extensive control and monitori...
Trench gate field termination IGBT represents the latest structure of insulated bipolar transistor (IGBT). Because internal current includes charging and discharging capacitance junction during switching transient, influence should be considered. The conductive channel trench is different from that planar structure, analysis method using will inevitably bring some deviation. Based on characteri...
In the pneumatic driving system for a soft mechanism, control valve is most heavy and expensive device. To realize compact inexpensive system, it necessary to reduce size, weight, cost of valve. previous study, low-cost flow rate type servo valves, that uses buckled tubes gate mechanism in an analog way, were proposed tested. However, these drift overlap zone was observed owing plastic deformat...
BACKGROUND Mitral valve replacement in the presence of severe annular calcification is a technical challenge. CASE REPORT A 47-year-old lady who had undergone mitral and aortic valve replacement for rheumatic disease 27 years before presented with dyspnea. At reoperation, extensive mitral annular calcification was hindering the disc motion of the Starr-Edwards mitral prosthesis. The old prost...
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