نتایج جستجو برای: micro baffle

تعداد نتایج: 116040  

Journal: :journal of computational applied mechanics 0
seddigheh jalilirad department of mechatronics engineering, college of engineering, south tehran branch, islamic azad university, tehran, iran mohammad hassan cheraghali department of mechatronics engineering, college of engineering, south tehran branch, islamic azad university, tehran, iran hossein ahmadi danesh ashtiani department of mechatronics engineering, college of engineering, south tehran branch, islamic azad university, tehran, iran

the paper studies optimization of shell-and-tube heat exchangers using the particle swarm optimization technique. a total cost function is formulated based on initial and annual operating costs of the heat exchangers. six variables – shell inside diameter, tube diameter, baffle spacing, baffle cut, number of tube passes and tube layouts (triangular or square) – are considered as the design para...

Journal: :Applied optics 2003
Vesselin Shaoulov Jannick P Rolland

Recent progress in micro-optics fabrication and optical modeling software opens the opportunity to investigate how microlenslet-array-based compact relay systems can be designed and assessed. We present various optical configurations that include an appropriate baffle computation to eliminate ghost images, followed by an analysis of image quality. The investigation shows the existing trade-off ...

Journal: :European heart journal cardiovascular Imaging 2016
Roel L F van der Palen Jos J M Westenberg Mark G Hazekamp Irene M Kuipers Arno A W Roest

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . doi:10.1093/ehjci/jev331 Online publish-ahead-of-pr...

Journal: :The Journal of the Acoustical Society of America 2012
L Maxit C Yang L Cheng J-L Guyader

A micro-perforated panel (MPP) with a backing cavity is a well known device for efficient noise absorption. This configuration has been thoroughly studied in the experimental conditions of an acoustic tube (Kundt tube), in which the MPP is excited by a normal incident plane wave in one dimension. In a more practical situation, the efficiency of MPP may be influenced by the vibro-acoustic behavi...

Journal: :Heart 1996
J M Abdulhamed S A Alyousef C Mullins

Stenting of the left pulmonary venous baffle obstruction was successfully performed in a 6 year old girl after the Mustard operation for transposition of the great arteries. She also had stent implantation in both the superior vena cava and inferior vena cava baffle junctions. These procedures were followed by sustained clinical improvement. Angiography showed that all three stents were fully p...

Journal: :international journal of advanced design and manufacturing technology 0
meysam atashafrooz department of mechanical engineering, shahid bahonar university of kerman, iran s. a. gandjalikhan nassab e. sadat behineh

in this paper, the effects of baffle on thermal characteristics of combined convection-radiation heat transfer in laminar flow adjacent to an inclined backward facing step (bfs) in a horizontal duct are investigated. a baffle is mounted on the top wall of channel downstream side of step. in this study, the fluid is treated as a gray, absorbing, emitting and scattering medium; therefore, in the ...

Journal: :J. Applied Mathematics 2012
Mi-An Xue Jinhai Zheng Pengzhi Lin

A two-phase fluid flow model solving Navier-Stokes equations was employed in this paper to investigate liquid sloshing phenomena in cubic tank with horizontal baffle, perforated vertical baffle, and their combinatorial configurations under the harmonic motion excitation. Laboratory experiment of liquid sloshing in cubic tank with perforated vertical baffle was carried out to validate the presen...

2017
Natasha Mhatre Robert Malkin Rittik Deb Rohini Balakrishnan Daniel Robert

Object manufacture in insects is typically inherited, and believed to be highly stereotyped. Optimization, the ability to select the functionally best material and modify it appropriately for a specific function, implies flexibility and is usually thought to be incompatible with inherited behaviour. Here, we show that tree-crickets optimize acoustic baffles, objects that are used to increase th...

Journal: :Physical chemistry chemical physics : PCCP 2015
Jack A Branch David A Cook Philip N Bartlett

Detailed analysis of the voltammetry of decamethylferrocene at micro and macrodisc electrodes has been carried out in scCO2/MeCN (15 wt%), 20 mM [NBu(n)4][BF4] and 309 K and 17.5 MPa. A passivating film needs to be removed from platinum electrodes before stable, reproducible voltammetry can be obtained. At low concentrations (0.22 mM) reversible 1e(-) behaviour is observed. Significant effects ...

2015
C.-C. Cheng C. -H. Liao Feng Chia

This paper presents a UV (ultraviolet) lithography apparatus that utilizes an array composed of UV-LED (light emitting diode) collimation modules as a micro-patterning light source for PCB (printed circuit board) fabrication. To provide a uniform (non-uniformity > 90%) and collimated (FWHM < ±2°) exposure area, hexagonal light source modules are disposed in a hexagonal array. Each module is con...

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