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国家自然科学基金(60531010)

作品数:33 被引量:84H指数:5
相关作者:黄卡玛杨晓庆贾国柱郭改文华伟更多>>
相关机构:四川大学河南教育学院中州大学更多>>
发文基金:国家自然科学基金国家教育部博士点基金河南省高等学校青年骨干教师资助计划项目更多>>
相关领域:理学电子电信自动化与计算机技术电气工程更多>>

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33 条 记 录,以下是 1-10
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生物逆问题中测量信息的熵描述被引量:1
2008年
针对生物逆问题中参数识辨前的重要问题——测量点位置的选取,应用贝叶斯理论,采用待识辨参数的后验概率来定义参数样本出现的概率,将信息熵引入到测量信息的描述中,利用信息熵构造出评价因子,通过评价因子表示出不同位置测量点的"贡献"大小。对单物种生态模型的计算结果表明:用信息熵表示的评价因子能够较好地反映重构误差的变化规律,有效地描述不同位置的测量点对参数识辨的贡献大小。
李静黄卡玛
关键词:逆问题信息熵贝叶斯方法
A numerical analytic method for electromagnetic radiation accompanying with fracture of rocks
2010年
This paper studies Rabinovitch's compression experiments on granite and chalk and proposes a.n oscillating dipole model to analyse and simulate the electromagnetic radiation phenomenon caused by fracture of rocks. Our model assumes that the electromagnetic radiation pulses are initiated by vibrations of the charged rock grains on the tips of the crack. The vibrations of the rock grains are stimulated by the pulses of the cracks. Our simulations show comparable results with Rabinovitch's compression experiments. From the simulation results, it verifies an assumption that the crack width is inversely proportional to the circular frequency electromagnetic radiation, which is presented by Rabinovitch et al. The simulation results also imply that, by using our oscillating dipole model together with Rabinovitch's two equations about the crack length and crack width, we can quantitatively analyse and simulate the electromagnetic radiation phenomenon, which is induced from the fracture of the rocks.
陈震黄卡玛
A preliminary study on numerical simulation of microwave heating process for chemical reaction and discussion of hotspot and thermal runaway phenomenon被引量:2
2009年
The nonlinear process of microwave heating chemical reaction is studied by means of numerical simulation. Especially,the variation of temperature in terms of space and time,as well as the hotspot and thermal runaway phenomena are discussed. Suppose the heated object is a cylinder and the incident electromagnetic(EM) wave is plane wave,the problem turns out to be a coupling calculation of 2D multi-physical fields. The integral equation of EM field is solved using the method of moment(MoM) and the thermal conduction equation is solved using a semi-analysis method. Moreover,a method to determine the equivalent complex permittivity of reactant under the heating is presented in order to perform the calculation. The numerical results for water and a dummy chemical reaction(A) show that the hotspot is a ubiquitous phenomenon in microwave heating process. When the radius of the heated object is small,the highest temperature occurs somewhere inside the object due to the concentration of the EM wave. While the radius increases to a certain degree,the highest temperature occurs somewhere close to the surface due to the skin effect,and the whole high temperature area shows crescent-shaped. That is in accordance with basic physical principles. If the radius is kept the same in the heating process,the hotspot position of water does not change,while that of reaction A with several radius values varies. For either water or A,the thermal runaway phenomenon in which small difference of radius results in large difference of highest temperature,occurs easily when the radius is small. On the contrary,it is not evident when the radius is large. Moreover,it is notable that the highest temperature in water shows oscillating decreasing trend with the increase of radius,but in reaction A almost decreases monotonously. Further study should be performed to determine if this difference is only an occasional occurrence.
ZHAO XiangHUANG KaMaYAN LiPingYAO Yuan
关键词:MICROWAVEHEATINGHOTSPOTRUNAWAY
基于零折射率超材料的新型匹配高增益贴片天线被引量:2
2011年
针对基于零折射率超材料的矩形贴片天线的快速设计,提出了应用微遗传算法的自动优化方案,建立了利用Visual Basic语言编程调用时域有限差分方法对该天线的参数进行自动优化的计算机仿真程序,并成功计算出了优化的参数数据。采用优化数据加工制作了天线实物并进行了测量,仿真和实测结果吻合良好,零折射率材料对矩形贴片天线增益提升超过10 dB,实现了最高16.2 dBi的增益,并且在11.7 GHz到12.6 GHz的频带范围内阻抗匹配良好,证明了该方案的有效性和可靠性。
蒲天乐黄卡玛王波
关键词:超材料天线
微波频率下电解质溶液复介电常数随功率的变化被引量:1
2006年
通过实验分别测量了纯水、草酸钠、高锰酸钾和氯化钠水溶液的复介电常数随微波测量功率改变的情况,发现4种待测物质的复介电常数实部都随微波功率改变较小,而草酸钠、高锰酸钾和氯化钠水溶液的复介电常数虚部随微波功率改变明显。通过对实验测试系统误差和温度误差分析,结果显示,测量数据可靠,电解质溶液体系介电常数虚部和功率存在直接联系。
康迂明方峪枫王志辉胡荣骅贾国柱杨晓庆黄卡玛
关键词:微波电解质溶液复介电常数
微波作用下氯化钠水溶液介电特性变化机理被引量:4
2006年
实验研究发现,微波作用下的恒温氯化钠水溶液随着微波功率的增加,其复介电系数的虚部会发生明显变化从理论上分析表明,在微波场中极化水分子转动能级被激发将会引起质子定向移动和团簇氢键完好的概率变化而影响氯化钠水溶液电导率,进而造成其复介电系数虚部的明显变化。此现象应归属于微波的非热效应。
贾国柱杨晓庆黄卡玛
关键词:微波介电系数
微波辐射对硫酸钙结晶生长的影响被引量:1
2006年
在相同的结晶条件下,采用微波加热与传统加热所形成的硫酸钙晶体形貌有明显差异。通过蒙特卡罗模拟对此现象进行了分析和解释,模拟结果显示,微波辐射影响了硫酸钙晶体的生长过程,从而影响了硫酸钙晶体形貌。
杨晓庆王照伦贾国柱华伟黄卡玛
关键词:微波形貌蒙特卡罗模拟
The precise condition of thermal runaway in microwave heating on chemical reaction被引量:2
2009年
The precise condition of thermal runaway in microwave heating on chemical reaction with a feedback control system is quantitatively studied. First, the precise condition of thermal runaway in engineering application is derived based on the principle of the feedback control system. Then, the temperature rising rates for 4 different kinds of reaction systems placed in the waveguide and irradiated by micro-wave with different input powers are simulated. Finally, the relationship, which is inattentive so far, between the thermal runaway and the sensor's response time is discussed.
HUANG KaMaLU Bo
关键词:MICROWAVECHEMISTRYMICROWAVERUNAWAYMULTI-PHYSICS
电解质溶液复介电常数测量中金属杂质的影响被引量:2
2007年
为了克服金属杂质对电解质溶液复介电常数测量结果的影响,分别对不同位置与数量的金属杂质对氯化钠溶液复介电常数测量的影响进行了数值分析。计算结果表明:金属杂质对电解质溶液复介电常数测量值的实部影响很小,而对虚部影响较大,且金属杂质对虚部的影响随着探头表面的金属杂质数量的增加而增大。
王志辉方峪枫杨晓庆黄卡玛
关键词:微波测量电解质溶液复介电常数金属杂质
微波辐射下电解质水溶液中的非热效应研究被引量:5
2007年
利用终端开路的同轴探头,在不同微波功率下对多种电解质水溶液中的反射系数进行了测量。测量结果显示:微波作用电解质水溶液中存在新的现象,溶液中的反射系数受微波功率大小影响,并且影响的程度与电解质溶液电导率大小有关。以NaCl水溶液为例,进行了多物理场计算和细致的温度测量,计算和测量结果同时排除了热效应导致此现象发生的可能,微波作用于电解质溶液的确存在非热效应。
杨晓庆黄卡玛
关键词:微波电解质水溶液电导率
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