نتایج جستجو برای: air channels
تعداد نتایج: 343206 فیلتر نتایج به سال:
Introduction: Accelerated Partial Breast Irradiation (APBI) is an effective treatment for breast carcinomas because of its limited number of fractions. Strut-adjusted volume implant (SAVI) is a HDR brachytherapy applicator to deliver the prescription dose with good PTV coverage and acceptable dose to skin, chest wall and organ at risks. Acceptable clinical outcomes depend on a...
In this paper, a comparative analysis of schemes heat and mass transfer devices indirect evaporation type is carried out. These are family plane-parallel channels, in one which the water film takes place. Mathematical modeling based on solving system differential equations that represent balance for each channels. Numerical studies out wide range input parameters: temperature from 15 to 50 °С, ...
Effects of geometrical dimensions of flow channels of a large-active-area PEM fuel cell: A CFD study
Various flow field designs have been numerically investigated to evaluate the effect of pattern and cross-sectional dimensions channel on performance a large active area PEM fuel cell. Three types multiple-serpentine channels (7-channels, 11-channels 14-channels) chosen for 200 cm2 cell analysed by varying width land channel. The CFD simulations showed that as decreases, in 14-channels serpenti...
Long-term potentiation (LTP) is a form of activity-dependent plasticity that occurs during learning. Potassium channels are the most diverse group of all ion channels that related to synaptic plasticity. Small-conductance calcium-activated potassium channels (SKs) are found in hippocampal CA1 neurons and by inhibiting of postsynaptic potentials are involved in synaptic transmission impairment. ...
The advent of microfabricated ion traps for the quantum information community has allowed research groups to build traps that incorporate an unprecedented number of trapping zones. However, as device complexity has grown, the number of digital-to-analog converter (DAC) channels needed to control these devices has grown as well, with some of the largest trap assemblies now requiring nearly one h...
The Internet has transformed the nature of business-to-consumer transaction-making practices in many industries. Sellers now attract customers with innovative Internet-based selling mechanisms that can reveal or conceal market information. We define market transparency as a design dimension for Internetbased selling that involves firm choices about the level of availability and accessibility of...
This paper presents an overview of the wideband CDMA concept which was chosen in ETSI (European Telecommunications Standards Institute) in January 1998 as a basis for UMTS air interface for FDD (Frequency division duplexing) operation. UMTS is the 3rd generation mobile communication system specified within ETSI. This paper is organized as follows. First, the background of WCDMA is presented in ...
The organization of data on wireless channels, which aims to reduce the access time of mobile clients, is a key problem in data broadcasts. Many scheduling algorithms have been designed to organize flat data on air. However, how to effectively schedule semistructured information such as XML data on wireless channels is still a challenge. In this paper, we firstly propose a novel method to great...
The calculation of two-phase flow boiling heat transfer of R22 in channels is required in a variety of applications, such as chemical process cooling systems, refrigeration, and air conditioning. A number of correlations for flow boiling heat transfer in channels have been proposed. This work evaluates the existing correlations for flow boiling heat transfer coefficient with 1669 experimental d...
The cooling performance of the air-conditioning system in electric vehicles could be enhanced through geometrical optimization air ducts. Furthermore, it has been proven that heat-transfer divergent channels is better than conventional channels. Therefore, present study investigates thermal and flow characteristics ducts with various rib shapes for vehicles. characteristics, namely, temperature...
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