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Search Results: 1 - 10 of 84424 matches for " 吴巍 "
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一种基于漂移模型的管内气液两相流分析方法
A Method Based on Drift-Flux Model for the Analysis of Steam-Water Two-Phase Flow
 [PDF]

, 唐胜利
International Journal of Fluid Dynamics (IJFD) , 2014, DOI: 10.12677/IJFD.2014.22002
Abstract:

针对热力系统管道内气液两相流动,在漂移通量理论和水力模型基础上,综合考虑管道倾角对空泡份额分布参数C0及漂移速度Vgj的影响,提出了一种迭代求解空泡份额的简化水力模型,该模拟的计算结果与绝热管及均匀加热管内两相流动试验数据相比有很好的吻合度,证明了该模型的可用性,为工程实际应用提供了参考。
Simulation program based on the theory of drift-flux and hydraulic model was finished in consideration of the influence of pipe angle on distribution parameter C0 and drift velocity Vgj within thermodynamic system two-phase flow. A research was carried out using a simplified hydraulic model in which the void fraction was calculated by iteration; according to the computing result of both adiabatic and uniform heated two-phase pipelines, the comparison was given, and the details showed that theoretical analysis was well agreed with experimental results and provided a refer- ence for engineering application.

一种改进的方向性菱形运动估计算法

武汉理工大学学报 , 2008,
Abstract: ?针对方向性菱形搜索算法搜索不精确的情况,提出一种改进的算法。通过设置阈值来判断宏块的运动类型,依据运动类型来选取模板:若为剧烈运动,使用方向性菱形模板,若为缓慢运动,使用小菱形模板。对使用方向性模板时的搜索策略进行了改进,以保证有更好的图像质量。实验表明,该方法取得了较为理想的结果。
移动通信中的双向圆极化微带天线的设计
Design on Bi-Directional Circularly Polarized Microstrip Antenna for Mobile Communication
 [PDF]

, 汪敏,
Journal of Antennas (JA) , 2014, DOI: 10.12677/JA.2014.32002
Abstract:

本文设计了一种适用于狭长空间环境的双向圆极化微带天线。天线为双层结构的二元阵,下层为激励二元阵、上层为寄生二元阵,馈电点位于下层的几何中心。首先,利用切角的方式实现了圆极化,再通过近乎中心对称的电流分布实现了天线的双向辐射特性。在天线中心频率1.9 GHz上实现了夹角为72?的双向圆极化辐射,相对阻抗带宽约为8.2%,最大辐射方向上相对轴比带宽(AR < 3dB)2.1%,增益约为5.7 dBi。
A bi-directional and circularly polarized microstrip patch antenna is proposed for applications in the long corridor environment. This antenna consists of two substrate layers, in which binary- element patch array is at the bottom and parasitic binary element array is on top layer. It is center-fed from the bottom layer. Firstly, the circular polarization is achieved by means of truncating corners. Secondly, the bi-direction pattern is realized with the nearly symmetrical current distribution. A bi-directional radiation pattern has been achieved at the center-frequency of 1.9 GHz. The relative impedance bandwidth is about 8.2%, while the axial ratio bandwidth is about 2.1% at maximum radiation direction. The gain is about 5.7 dBi.

不同汽源参数对船用蒸汽蓄热器充汽过程影响的数值研究
Numerically Investigating Influence of Different Steam Source Parameters on Charging Process of Marine Steam Accumulator
 [PDF]

, 杨元龙
Applied Physics (APP) , 2014, DOI: 10.12677/APP.2014.410020
Abstract:
采用考虑汽液两相蒸发与冷凝的两流体模型和热相变模型,基于不同充汽流量和温度耦合的边界条件,进行了不同汽源参数下船用蒸汽蓄热器充汽过程数值模拟,分析了不同充汽流量和温度对蒸汽蓄热器充汽过程动态特性的影响。计算结果表明,充热能量一定条件下,充汽温度越高,蓄热器内部蒸汽温度越高,温度场和速度场分布越不均匀;充汽流量降低,蒸汽射流效应更加强烈。
Two-fluid model and thermal change model with considerations of evaporation and condensation for vapor and liquid were utilized. Based on the coupled boundary conditions with different charging flow rates and temperatures, numerical investigation on the influence of different steam source parameters on charging process of marine steam accumulator was carried out. Effects of different charging flow rates and temperatures on the dynamic characteristics of charging process for steam accumulator were analyzed. The calculated results showed that higher charging tem-perature resulted in higher temperature for steam in an accumulator in the term of certain charging energy per unit time, causing nonuniform temperature and flow field. Lower charging flow rate could cause stronger steam jet.

静止无功发生器递归神经网络多目标监督控制
捷
电力系统自动化 , 1999,
Abstract: 利用递归神经网络的动态映射能力,将递归神经网络应用于新型静止无功发生器(ASVG)的控制中,根据系统不同的运行点,构造了ASVG多目标递归神经网络监督控制器。仿真研究表明,这种控制器可以对系统大范围运行实现良好的控制。
静止无功发生器递归神经网络逆动力学控制
捷
电力系统自动化 , 1999,
Abstract: 根据对角递归神经网络的特点分析了其非线性映射能力,并根据新型静止无功发生器(ASVG)的特点提出了ASVG递归神经网络逆动力学控制。所构造的控制器由于可以实现ASVG电力系统非线性逆动力学特性的学习,因而根据期望的控制效果可以获得期望的控制量。理论分析与仿真实验表明,这种控制器可以对ASVG实现良好的控制。
静止无功发生器的递归神经网络建模

电力系统自动化 , 1999,
Abstract: 利用递归神经网络的动态映射能力,实现了静止无功发生器的递归神经网络建模,构造了ASVG递归神经网络模型。理论分析与仿真实验表明,所建立的递归神经网络模型可以很好地实现正常运行及故障状态下ASVG电力系统的非线性动态映射。
静止无功发生器递归神经网络自适应控制

电力系统自动化 , 1999,
Abstract: 构造了新型静止无功发生器(ASVG)递归神经网络自适应控制系统,该系统由递归网络辨识器及神经网络控制器构成,所构造的系统可以实现ASVG的非线性自适应控制。仿真实验表明,该控制系统具有良好的控制品质、鲁棒性及泛化能力,是一种较为通用的电力系统控制模型。
关于电压放大电路静态工作点稳定性的定量分析

四川师范大学学报(自然科学版) , 2000,
Abstract: 利用直流等效电路对两种偏置方式下电压放大电路静态工作点的稳定性进行了定量分析,得出了一些有益的结论更多还原
吴康衡治疗慢性肾功能衰竭经验
申涛,
中国中医药信息杂志 , 2013, DOI: 10.3969/j.issn.1005-5304.2013.08.042
Abstract:
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