Results 121 to 130 of about 2,174 (175)
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Ophthalmic and facial veins are not valveless
Clinical & Experimental Ophthalmology, 2010AbstractBackground: The ophthalmic and facial veins are frequently stated to be devoid of valves, facilitating the spread of infection from the mid‐face to the cavernous sinus.Methods: Twelve superior and eight inferior ophthalmic veins together with 13 angular and facial veins were harvested from adult cadavers.
John, Zhang, Mark D, Stringer
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The Journal of the Acoustical Society of America, 1985
Each of seven modified trumpet tubes is connected by a series of tubular "Y" connections to a single, conventional mouthpiece. Each modified tube is similar to a conventional trumpet except that its three manually-operated finger valves and associated valve slides have been replaced by a single, generally U-shaped tubular slide, which is slidably ...
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Each of seven modified trumpet tubes is connected by a series of tubular "Y" connections to a single, conventional mouthpiece. Each modified tube is similar to a conventional trumpet except that its three manually-operated finger valves and associated valve slides have been replaced by a single, generally U-shaped tubular slide, which is slidably ...
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Optimization of valveless micropump for drug delivery
The 9th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS), 2014With controlled drug delivery system, appropriate and effective amount of drug can be precisely delivered at appropriate time by a micropump. This is achieved with the use of diffuser and nozzle elements that eliminate the need for valve mechanism simplifying the micropump design and fabrication.
Jiaqi Wang, Kean C. Aw, Rajnish Sharma
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SPIE Proceedings, 2009
A new valveless micropump for controlling micro-flow rate was designed and fabricated using simple fabrication technology. The working principle of valveless micropump was analyzed based on Computational Fluid Dynamics (CFD) program ANSYS/Flotran.
S. M. Yuan, L. T. Yan, Q. Liu
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A new valveless micropump for controlling micro-flow rate was designed and fabricated using simple fabrication technology. The working principle of valveless micropump was analyzed based on Computational Fluid Dynamics (CFD) program ANSYS/Flotran.
S. M. Yuan, L. T. Yan, Q. Liu
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Aeronautical journal (London, England : 1897), 1900
When the astronomers next announce an exceptionally brilliant display of the Leonids, for the sake of the balloonists who make elaborate and costly preparations, it is to be hoped they will be more accurate in their calculations. The spectacle of seven shooting stars is in itself scarcely worth such a risk to life and limb as the Eev. J. M.
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When the astronomers next announce an exceptionally brilliant display of the Leonids, for the sake of the balloonists who make elaborate and costly preparations, it is to be hoped they will be more accurate in their calculations. The spectacle of seven shooting stars is in itself scarcely worth such a risk to life and limb as the Eev. J. M.
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Analytical Model of Valveless Micropumps
Journal of Microelectromechanical Systems, 2009The flow driven by a valveless micropump with a single cylindrical pump chamber and two diffuser/nozzle elements is studied theoretically using a 1-D model. The pump cavity is driven at an angular frequency omega so that its volume oscillates with an amplitude V m. The presence of diffuser/nozzle elements with pressure-drop coefficients zeta+, zeta- (>
I. Eames, A. Azarbadegan, M. Zangeneh
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A valveless micropump for bidirectional applications
Sensors and Actuators A: Physical, 2007Abstract This paper describes a new valveless micropump for bidirectional use. The micropump was fabricated by bonding a fluidic channel and a membrane actuator. The fluidic channel was etched on a glass substrate and the membrane actuator was made on a silicon wafer.
Jae Sung Yoon +3 more
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Investigation of the Flow in Valveless Pumps
Applied Mechanics and Materials, 2013An investigation of flow in valveless micropumps is presented. Numerical simulations are done using ANSYS. It is found that both laminar flow and turbulence phenomena would occurs in the diffuser/nozzle element. And SST (shear stress transport) turbulence model is chosen to be the most appropriate turbulence model,The simulations show when the opening ...
Lan Bai, Li Na Guan, Yue Gang Luo
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