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A series of theoretical and experimental studies on the microstrip patch antennas with dielectric superstrates is carried out systematically. Firstly, a comprehensive survey of the microstrip antenna technology and its theories are presented. Then, two analysis techniques, named as the spectral domain Green's function method and the spectral domain integral equation method are developed. The SDGF method is a simplified analysis technique, which takes advantage of the spectral domain immittance approach to find the dyadic Green's function for the stratified media, and obtains the complete closed-form formulas for radiation patterns, directivity, efficiency, gain etc. Some interesting calculated results are presented. The SDIE method is capable of determining resonant frequency, radiation characteristics, input impedance etc, for the covered microstrip patch antennas. Comparing with other full-wave analyses it reduced computation and mathematical labour remarkably. The singularities near the pole location of the surface-wave modes and the difficulty of the integral computation over infinite range of oscillating integrands are dealt with actively and documented well. Results predicted by the SDIE method agree extremely well with our experimental results for resonant frequencies of various superstrates. The superstrate effects on impedance and radiation characteristics also have been investigated experimentally so that the gap due to lack of measured data and computed results for multi-layered superstrate has been filled to some degrees and two useful observations have been achieved for weakening the resonant frequency shift and optimizing the microstrip antenna gain. As a meaningful application, the design and analysis of a 4×4 patch array are introduced.

实用微带天线普遍加介质覆盖层来防护热,物理损伤和环境影响,也可能在飞行或严酷气候条件下自然形成覆盖层本论文对带介质覆盖层的微带贴片天线系统地作了一系列理论和实验研究首先,对微带天线技术和理论作了全面的综述然后,发展了两种分析方法,称为谱域格林函数法和谱域积分方程法SDGF法是一种简化的分析技术,它利用谱域导抗法来求得分层媒质的并矢格林函数,并得出方向图、方向性系数、增益等参数的完整的闭式公式,给出了一些令人感兴趣的计算结果SDIE法能确定介质覆盖微带天线的谐振频率、辐射特性和输入阻抗等与其它全波分析方法相比,它明显减小了计算量和数学工作量已有效地处理了表面波模极点附近的奇异性和对振荡的被积函数的无限区间积分计算的困难对于不同覆盖层情况下的谐振频率,由SDIE法所预示的结果与我们的实验结果吻合得很好对于覆盖层对阻抗和辐射特性的影响也已作了实验研究这在某种程度上填补了缺少实验数据和计算结果之间的间隙,并得出了缓解谐振频率偏移和优化天线增益的两点有用的结论作为有意义的应用,介绍了一个4×4元矩形贴片天线阵的设计和分析。

We'll separate the course into two parts, that is, the introduction of the main topics in experimental psychology ( including psychophysics, perception, attention and reaction time, conditioning and learning, remembering and forgetting, thinking and problem solving, individual differences and development, social influence, environmental psychology, and human factors ), and the laboratory through which students will be asked to know to use E-prime to design and program experiments and to conduct a classic study and a real study by a group of three or four people.

一是实验心理学主要内容介绍,包括心理物理学方法、知觉、注意和反应时、条件反射和学习、记忆和遗忘、思维和问题解决、个体差异和发育、社会影响、环境心理学和人格等;二是实验室实践,学生将学会如何利用 E-prime进行实验设计及实验程序的编写;此外,学生将以3~4人为一小组重复一个经典的心理学实验,并在此基础上设计完成一个新的实验。

Based on the experimental simulation studies on the boilover phenomena using different scale oil tanks and various kinds of oil, the basic characteristics of boilover were analyzed. And then, more attention was paid to the typical sub-processes in boilover such as (1) the fire behavior during boilover,(2) the thermal structure in oilwater layer,(3) the generation, growth and moving process of vapor bubbles on the oil-water interface and in the oil layer,(4) the premonitory micro-explosion phenomena of boilover and its noise aspects,(5) vapor explosion phenomena on the oil-water interface,(6) the burning rate of oil and etc.

在运用中、小尺度模型油罐和多种实验油品,对扬沸火灾现象进行模拟实验研究的基础上,分析了扬沸火灾的基本性状,着重考察了扬沸火灾过程中的一些典型分过程:(1)扬沸火灾的火行为,(2)油水层热结构特性,(3)在油界面上及油层中的蒸汽泡形成、长大、运动特性,(4)扬沸前兆燃烧微爆现象及其噪声特性,(5)油水界面上的蒸汽微爆现象,(6)油品的燃烧速率等。

On the basis of previously research, this paper re-probe into the mechanism of electro-chemist mechanical manufacturing process, making the rational technological parameter, and developing the manufacturing equipment. Through a lot of technology tests, get a lot of labratory data, accordingly, researched the surface feature of the electro-chemist manufacturing process, and deeply discussed its influence on the work piece feature. The last result is that: the electro-chemist mechanical manufacturing process can reduce the low-frequency component significantly, but on high-frequency component, it has little influence, having obviously positive pole flat effect. After manufacture, the tip parts on the surface of the work piece is cut off, there is micro "high land" shape, the parameter for surface roughness is reduced a lot, the surface outline of the work piece is negative, the bearing length rate is cliffy. Also the surface quality of the work piece is improved. This can help to avoid changing the shape, improve the feature of rub, gear and reduce the time to suit. This would also ensure the precision and result in a longer work piece life.

在以前研究的基础上,本论文重新探讨了电化学机械复合光整加工工艺的机理,确定了较合理的工艺参数,对电化学机械复合光整加工设备进行了改进,通过工艺实验广泛地搜集了大量实验数据,依据实验数据,多角度地研究了电化学机械复合光整加工的表面形貌特点,并且从理论上深入讨论了电化学机械复合光整加工表面形貌对工件工作性能的影响,最后得出的结论为:电化学机械复合光整加工对工件原始表面的低频成分有较大程度的降低,而对高频成分影响较小,有明显的阳极整平作用,被加工工件表面的尖峰状凸起被去除,工件表面呈现出微观&高原型&,表面轮廓不平度高度特性参数大幅度降低,工件表面轮廓分布集中,且呈负偏态,轮廓偏斜度为负值,轮廓支承长度率曲线陡峭,工件的表面质量得到综合改善,这对提高零件的抗接触变形能力、改善摩擦、磨损性能、降低工件的磨合时间、提高工件的精度保持性、延长工件的寿命均有利。

The second part was to test the appearance, ingredient analysis, surface potential, thermal conduction properties, and magnetism of the nano composite fluid prepared from the parameters. The experiment found that unoxidized particles, Ag, Cu, Fe, and Ni appeared round. If combined with oxygen in water as oxides, the nano particles would grow toward certain directions. In copper/iron nano composite fluid, FeO appeared cubic, Cu2O appeared coniferous. In silver/iron nano composite fluid, FeO was polygonal. In dielectric potential detection, the nano composite fluid was likely to aggregate and deposit, except for silver/iron set. In other sets, the pH of silver/cobalt nano composite fluid was 7, surface potential was 21.21mV; the pH for silver/nickel nano composite fluid was 6.5, surface potential was 21.04mV; the pH for copper/iron nano composite fluid was 7, surface potential was -30mV. The fluid particles of the three sets could all maintain suspension of 2 weeks or more. For thermal conduction, the silver/nickel, nano composite fluid showed the best thermal conduction. Under temperature of 30℃ fluid weight conduction of 0.4%, the thermal conduction increase was 26%. For magnetic detection, except for silver/iron nano composite fluid, the nano particles of other three sets were paramagnetic, and all four sets were soft magnetic nano composite materials.

第二部分。将由较佳制备参数所产出的奈米复合流体,进行形貌外观、成分分析、表面电位及热传导性质实验与磁性检测;在奈米颗粒的形貌部分,经实验发现Ag、Cu、Fe、Ni等未氧化的颗粒皆呈现近似圆形,而若与水中的氧结合形成氧化物,奈米颗粒则会朝特定方向成长,在铜/铁奈米复合流体中FeO为四方体结构、Cu2O的颗粒是针叶状,在银/铁奈米复合流体中FeO则为多边形结构;而介面电位检测方面,结果显示经本制程所产出的奈米复合流体除银/铁奈米复合流体这一组较容易聚集沉淀外,其他三组中银/钴奈米复合流体的pH值为7,表面电位为21.21mV,银/镍奈米复合流体的pH值6.5表面电位为21.04mV而铜/铁奈米复合流体的pH值为7时表面电位约在-30mV,且此三组流体颗粒皆能维持悬浮性2周以上,悬浮性较佳;热传导实验部分,四组奈米复合流体中以银/镍奈米复合流体在增进热传上效果最佳,在温度30℃及流体重量浓度0.4﹪条件下热传导系数增进达26﹪;磁检测方面,除了银/铁奈米复合流体外,其他三组奈米颗粒皆属顺磁性,且这四组奈米复合材料都是属软磁性。

It indicates the distinct element method simulation model of charging of bell-less top blast furnace may replace the model experiment that takes very long time, and spends a great amount of both manpower and material resources to research the law of charging of bell-less top. The distinct element method simulation is made for opening furnace charging of reality bell-less top blast furnace. The result of simulation is also very identical with that of measuring.

本文在高炉无钟炉顶实验模型上进行了单环和多环布料实验研究,同时运用离散单元法模拟模型对实验进行了数值模拟,得到的炉料分布和料面形状的实验结果与模拟结果相当吻合,这证明了离散单元法在高炉无钟炉顶布料中的应用是可行的,并且表明运用高炉无钟炉顶布料离散单元法模拟模型可以替代费时、费钱、费力的物理模型实验,进行无钟炉顶布料规律研究。

Based on both the strong-weak model and the strong-strong model, the instability caused by ions in equilibrium is simulated, some useful results are obtained. The results include the relation between instability growth rate and neutralization factor, the relation between instability threshold and neutralization factor, and the incoherent tune shift, the tune spread, the ion cloud distribution, the ion loss mechanism, as well as the ion accumulation limitation in the storage ring. With this understanding, we have carried out theoretical and experimental study for some ion clearing methods and their effects for the HLS ring. The minimum static clearing voltage is determined through calculating beam electric field and measuring ion current.

在上述基础上,我们对各种离子清洗的方法及清洗效果进行了理论和实验的研究:通过计算束流电场和测量清洗电极上的离子流来确定直流清洗电极所需的最小清洗电压;通过测量离子引起的频移来计算储存环的中性化系数;用模拟计算和实验测量证实了高频清洗能有效地克服储存环上离子俘获不稳定性;对由高频剔除系统形成的储存环部分束团填充模式下的离子俘获问题进行了初步研究,证实采用束团部分填充模式能在一定范围内克服离子俘获效应;并对各种离子清洗方法进行了比较。

The compound tray holds excellent features , it has been successfully used in industry namely , methane alcohol ethanol , methyl aeetyl distillations and etc It is also expected to have a broad prospect for applications in other chemical industry field In this paper , many studies are concerned with the gas liquid duallowing the hole and oscillating regulation of the compound tray by experiments These studies will provide theoretical and experimental foundation for the design and improvement of the compound tray The main part of which is a 500 mm inner diameter three compound trays column , serving as a hydrodynamic model , the system air ?

复合塔板以其优良的性能,在甲醇、乙醇和丙酮等生产精馏装置中获得了成功的应用,并在其它化工生产领域有着广泛的应用前景。本论文旨在通过实验研究复合塔板上气液穿孔流动及波动波动规律,为复合塔的设计和结构改进提供理论和实验依据。实验是在一塔径500mm的冷模塔内,以空气—水为物系,在常压下进行实验。

Firstly, because the triangle constrained matching propagation begins with the initial corresponding triangulations formed by a few seed points in the stereo pairs, this dissertation studies the affects of different numbers and different distributions of seed points on the image matching results through experimental analysis, and proposes a seed point selection strategy for different image texture conditions, an automatic selection algorithm is also designed that gives good distribution quality for a defined number of seed points.

首先,针对匹配传播过程中的种子点选取问题,通过实验分析研究了不同数量与分布的种子点所构成的初始三角网对匹配结果的影响,进而提出了不同影像条件下的种子点选取策略和一种自动提取一定数量、满足一定分布均匀度的种子点自动选取算法;其次,研究了海量数据情况下同名三角网的快速构建、数据组织存储与局部动态更新的方法;在此基础上,本文提出了随机传播、基于三角形拓扑关系的邻近传播和顾及纹理特征的自适应传播等三种传播策略,分别介绍了其详细的实现算法,并通过实验分析对这几种传播策略进行了比较,实验结果证明自适应传播方法在匹配的可靠性上最优。

This study focused on the absorption of vapor into aqueous LiBr and the absorption of ammonia gas into aqueous ammonia.

本项目以溴化锂溶液和氨水溶液作为研究重点,主要内容包括:对添加剂作用下的溴化锂溶液和氨水溶液表面张力进行了实验研究,发现添加剂对两种溶液表面张力的影响呈现出不同的性质;利用表面吸附动力学原理,对溶液的表面张力及动态表面张力进行了理论分析;利用激光阴影法对溴化锂溶液静池吸收过程中马拉戈尼对流的形成进行了可视化研究,并进而发现蒸汽添加剂比液体添加剂对吸收具有更好的强化效果;利用实验方法对溴化锂溶液垂直降膜吸收进行了研究,并从其基本方程出发得出了影响添加剂强化效果的主要因素;同时,也对添加剂对氨水鼓泡吸收的影响进行了实验研究;最后,对添加剂的强化机理进行了分析,即对于溴化锂溶液来说,添加剂对溶液吸收的影响主要体现在对吸收界面吸附特性的影响上,无论是气体添加剂还是液体添加剂,都有可能对溴化锂溶液吸收起到强化作用;对于氨水溶液而言,添加剂的影响主要还是体现在&盐析&作用上,当氨水浓度较低时,添加剂有可能对吸收起到强化作用。

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推荐网络例句

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm~150rpm时取得最大值,此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世,形体几无变化。

When I was in school, the rabbi explained everythingin the Bible two different ways.

当我上学的时候,老师解释《圣经》用两种不同的方法。