The Experts below are selected from a list of 9384 Experts worldwide ranked by ideXlab platform
Dennis L. Polla - One of the best experts on this subject based on the ideXlab platform.
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Surface-machined micromechanical membrane pump
[1991] Proceedings. IEEE Micro Electro Mechanical Systems, 1991Co-Authors: Jack W. Judy, T. Tamagawa, Dennis L. PollaAbstract:An electrostatic micromechanical membrane pump for fluids and gases has been designed and fabricated with a process that is compatible with integrated circuits. The process consists of six photolithography steps and eight low-pressure chemical vapor depositions. No bulk silicon etchants or wafer bonding techniques are used. Each pump consists of an input Valve, a pumping membrane, and an Output Valve. All parts are encapsulated by silicon nitride and are actuated by electrostatic forces. Actuation voltages of approximately 50 V are required for observable Valve closure and membrane deflections. Typical gas pumping displacements are between 12 to 640 nL per cycle. >
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Surface-machined micromechanical membrane pump
[1991] Proceedings. IEEE Micro Electro Mechanical Systems, 1Co-Authors: Jack W. Judy, T. Tamagawa, Dennis L. PollaAbstract:An electrostatic micromechanical membrane pump for fluids and gases has been designed and fabricated with a process that is compatible with integrated circuits. The process consists of six photolithography steps and eight low-pressure chemical vapor depositions. No bulk silicon etchants or wafer bonding techniques are used. Each pump consists of an input Valve, a pumping membrane, and an Output Valve. All parts are encapsulated by silicon nitride and are actuated by electrostatic forces. Actuation voltages of approximately 50 V are required for observable Valve closure and membrane deflections. Typical gas pumping displacements are between 12 to 640 nL per cycle. >
Jack W. Judy - One of the best experts on this subject based on the ideXlab platform.
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Surface-machined micromechanical membrane pump
[1991] Proceedings. IEEE Micro Electro Mechanical Systems, 1991Co-Authors: Jack W. Judy, T. Tamagawa, Dennis L. PollaAbstract:An electrostatic micromechanical membrane pump for fluids and gases has been designed and fabricated with a process that is compatible with integrated circuits. The process consists of six photolithography steps and eight low-pressure chemical vapor depositions. No bulk silicon etchants or wafer bonding techniques are used. Each pump consists of an input Valve, a pumping membrane, and an Output Valve. All parts are encapsulated by silicon nitride and are actuated by electrostatic forces. Actuation voltages of approximately 50 V are required for observable Valve closure and membrane deflections. Typical gas pumping displacements are between 12 to 640 nL per cycle. >
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Surface-machined micromechanical membrane pump
[1991] Proceedings. IEEE Micro Electro Mechanical Systems, 1Co-Authors: Jack W. Judy, T. Tamagawa, Dennis L. PollaAbstract:An electrostatic micromechanical membrane pump for fluids and gases has been designed and fabricated with a process that is compatible with integrated circuits. The process consists of six photolithography steps and eight low-pressure chemical vapor depositions. No bulk silicon etchants or wafer bonding techniques are used. Each pump consists of an input Valve, a pumping membrane, and an Output Valve. All parts are encapsulated by silicon nitride and are actuated by electrostatic forces. Actuation voltages of approximately 50 V are required for observable Valve closure and membrane deflections. Typical gas pumping displacements are between 12 to 640 nL per cycle. >
T. Tamagawa - One of the best experts on this subject based on the ideXlab platform.
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Surface-machined micromechanical membrane pump
[1991] Proceedings. IEEE Micro Electro Mechanical Systems, 1991Co-Authors: Jack W. Judy, T. Tamagawa, Dennis L. PollaAbstract:An electrostatic micromechanical membrane pump for fluids and gases has been designed and fabricated with a process that is compatible with integrated circuits. The process consists of six photolithography steps and eight low-pressure chemical vapor depositions. No bulk silicon etchants or wafer bonding techniques are used. Each pump consists of an input Valve, a pumping membrane, and an Output Valve. All parts are encapsulated by silicon nitride and are actuated by electrostatic forces. Actuation voltages of approximately 50 V are required for observable Valve closure and membrane deflections. Typical gas pumping displacements are between 12 to 640 nL per cycle. >
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Surface-machined micromechanical membrane pump
[1991] Proceedings. IEEE Micro Electro Mechanical Systems, 1Co-Authors: Jack W. Judy, T. Tamagawa, Dennis L. PollaAbstract:An electrostatic micromechanical membrane pump for fluids and gases has been designed and fabricated with a process that is compatible with integrated circuits. The process consists of six photolithography steps and eight low-pressure chemical vapor depositions. No bulk silicon etchants or wafer bonding techniques are used. Each pump consists of an input Valve, a pumping membrane, and an Output Valve. All parts are encapsulated by silicon nitride and are actuated by electrostatic forces. Actuation voltages of approximately 50 V are required for observable Valve closure and membrane deflections. Typical gas pumping displacements are between 12 to 640 nL per cycle. >
Steven D. Wolff - One of the best experts on this subject based on the ideXlab platform.
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COVA (cardiac Output Valve area): a reliable method for determining aortic transvalvular pressure gradients that does not use phase contrast imaging
Journal of Cardiovascular Magnetic Resonance, 2014Co-Authors: Kunal Patel, Seth Uretsky, Sunil Penesetti, Kavya Jain, Steven D. WolffAbstract:Background Echocardiography is often used to quantify the transvalvular pressure gradient in patients with aortic stenosis. Velocity-encoded MRI is alternative method for quantifying the aortic transvalvular pressure gradient. However, the acquisition of additional phase-contrast images is time consuming and the analysis can be technically difficult. We report on the results from a new method, Cardiac Output Valve Area (COVA), for quantifying the aortic transvalvular gradient that does not rely on phase contrast images. Instead the instantaneous pressure gradient is computed from the cardiac Output (based on the frame-by-frame changes in left ventricular systolic volume) and Valve area. The purpose of this study is to compare the results from all three methods. Methods
Kang Pyung Lee - One of the best experts on this subject based on the ideXlab platform.
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Development of technologies on test facility and procedures for the land-based test as a type approval test at ballast water treatment system
OCEANS'08 MTS IEEE Kobe-Techno-Ocean'08 - Voyage toward the Future OTO'08, 2008Co-Authors: Eun-chan Kim, Kyoungsoon Shin, Kang Pyung LeeAbstract:Abstract - The International Convention for the Control and Management of Ships Ballast Water & Sediments was adopted at a diplomatic conference of IMO at 2004. Following to the Convention, fourteen guidelines were developed by IMO. The efficacy of ballast water management systems should be evaluated by Administration in accordance with Guidelines for approval of ballast water management systems(G8). This guideline includes general requirements concerning design and construction, technical procedures for evaluation and the procedure for issuance of the type approval of ballast water management systems requires both land-based and shipboard testing. This paper considers the matter of facility and procedures for the land-based test as a type approval test. KORDI (Korea Ocean Research & Development Institution) is the designated Organization for land-based and shipboard testing for type approval of ballast water management systems in the Republic of Korea. When the testing body reviewed the various possibilities for the construction of a land-based test site, we found it not easy and very costly to pump sea water or fresh water containing high density of micro-organisms to an in-land test site. Therefore, it was decided to build a test barge dedicated for land-based tests. The barge was designed very similar to an actual ship with ballast tanks and its ballasting and de-ballasting method. The barge ship is composed of four 200 m3 tanks and a ballast water management system that is capable of pumping 300 tons of ballast water per hour with each pipe. A blower system is installed for the cleaning of the sampling tanks. There are four tanks of 2 m3 to control the dosage and each tank has an attached Output Valve to allow the possibility of sampling.
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Development oftechnologies ontest facility and procedures fortheland-based test asatypeapproval test atballast water treatment system
2008Co-Authors: Eun-chan Kim, Kyoungsoon Shin, Kang Pyung LeeAbstract:TheInternational Convention fortheControl andManagement ofShips Ballast Water& Sediments wasadopted ata diplomatic conference ofIMOat2004. Following totheConvention, fourteen guidelines weredeveloped byIMO.Theefficacy ofballast watermanagement systems shouldbeevaluated byAdministration inaccordance withGuidelines forapproval ofballast water management systems(G8). Thisguideline includes general requirements concerning design andconstruction, technical procedures for evaluation andtheprocedure forissuance ofthetypeapproval ofballast watermanagement systems requires bothland-based and shipboard testing. Thispaperconsiders thematteroffacility andprocedures fortheland-based testasa typeapproval test. KORDI(Korea OceanResearch & Development Institution) isthedesignated Organization forland-based andshipboard testing for typeapproval ofballast watermanagement systems intheRepublic ofKorea. Whenthetesting bodyreviewed thevarious possibilities fortheconstruction ofaland-based testsite, wefounditnoteasyandverycostly topumpseawaterorfresh watercontaining high density ofmicro-organisms toanin-land test site. Therefore, itwasdecided tobuild atestbargededicated forland-based tests. The bargewasdesigned verysimilar toanactual shipwithballast tanksanditsballasting andde-ballasting method.Thebargeshipis composed offour200m3tanksandaballast watermanagement system thatiscapable ofpumping 300tonsofballast waterperhour witheachpipe. A blower system isinstalled forthecleaning ofthesampling tanks. Therearefourtanksof2m3tocontrol thedosage andeachtankhasanattached Output Valve toallow thepossibility ofsampling.