نتایج جستجو برای: electrohydraulic forming
تعداد نتایج: 114952 فیلتر نتایج به سال:
Background and study aims Endoscopic retrograde cholangiography (ERC) in patients with complex surgically-altered anatomy (SAA) is technically demanding and has limitations. Developments in EUS-guided procedures allow alternative approaches for patients with altered gastrointestinal anatomy and biliary lithiasis. Patients and methods Single-center, retrospective review of prospectively ente...
A totally implantable artificial heart actuated by an electrohydraulic energy converter is described and the requirements for its physiological control scheme are listed. Eased on these specifications and on previous work done in our laboratory on control schemes for the Electro-Hydraulic Total Artificial Heart (EHTAH), preliminary experiments were conducted which confirmed the feasibility of t...
Background and study aims Endoscopic removal of biliary stones has high success rates, ranging between 85 % to 95 %. Nevertheless, some stones may be challenging and different endoscopic methods have evolved. Papillary large balloon dilation after sphincterotomy is a widely used technique with success rates ranging from 68 to 90 % for stones larger than 15 mm. Cholangioscopy allows performing ...
High bandwidth, high flow rate electrohydraulic valves typically have two or more stages. Most multi-stage valves are expensive, require meticulously clean fluid, and introduce higher order dynamics. On the other hand, single-stage spool valves are cheaper and more reliable. However, a majority of them are not suitable for high bandwidth, high flow rate applications due to limitations of the el...
We consider an electrohydraulic valve system (EHVS) model with uncertain parameters that may possibly vary with time. This is a nonlinear third order system consisting of two clearly separated subsystems, one for the piston position and the other for the chamber pressure. The nonlinearities involved are flow-pressure characteristics of the solenoid valves, the pressure dynamics of the chamber d...
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