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This article first antenna, microstrip theory, the circular polarization technology, the theoretical discussion, in this based on the microstrip antenna of circular polarization method - corner square microstrip antenna, and has done a design simulation , and then do the design and further research to improve and eventually get a resonant frequency (S11 reflection coefficient corresponding to the minimum frequency) for the 1.5GHz and 1.43GHz, the frequency of circular polarization for the 1.46GHz, S11 is less than -10dB relative bandwidth, the VSWR is less than 2 is about 8.8% relative bandwidth, axial ratio less than 3dB relative bandwidth of about 2.2% of the right circular polarization microstrip antenna design case, which proved very good the circular polarization microstrip antenna theory, also fully confirmed by a square corner design is a practical program, and select the appropriate regulation of sticks is indeed able to improve the performance of the antenna.
本文先对天线、微带理论、圆极化技术等进行了理论论述,在此基础上,提出圆极化微带天线的实现方法——切角方形微带天线,并对此做了设计仿真,后又对这一设计方案做了改进及进一步研究,最终得到一个谐振频率(反射系数S11 的最小值所对应的频率)为1.5GHz和1.43GHz,圆极化频率为1.46GHz,S11 小于-10dB 的相对带宽、驻波比小于2 的相对带宽约为8.8%,轴比小于3dB 的相对带宽约为2.2%的右旋圆极化微带天线的设计案例,从而很好的印证了圆极化微带天线理论,也充分证实了切角方形是一种切实可行的设计方案,而选取合适的调节枝则确能提高天线的性能。
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By analytic geometry method and solving quadratic equation,a computer simulation algorithm of digital projection under arbitrary scanning locus was proposed.The algorithm is based on the rules of attenuation of monochromatic X-rays.Through mathematical modeling and computer simulation,digital projections of ellipsoid and cylinder in circular and helix scanning modes are exemplified respectively,which are proved to be correct by FDK and PI-line reconstruction algorithms.
介绍了一种利用解析几何和求解二次方程仿真任意扫描轨迹下的锥束射线投影数据算法,该方法基于单色射线贯穿物体的衰减理论,通过数学建模与计算机仿真,给出了椭球、圆柱两种典型模型分别在单圆、螺旋线扫描轨迹下的投影数据仿真结果,并利用FDK和PI线重建算法进行验证,证明了该种数值仿真方法的正确性。
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Magellan's circumnavigation of the earth proved that it is a globe.
麦哲伦的周游世界说明地球是圆的。
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The lawyer established the fact that the theft of the apples had not been circumstantially proved.
这律师认定偷苹果的事没有具体的事实证明。
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Skeptics said a CISC architecture couldn't do it, but the Pentium proved otherwise.
怀疑论者说过采用CISC架构无法实现这一点,但是奔腾却证明了相反的一面。
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Reductive conversion of geraniol to citronellol is adopted as a model reaction, and several factors in the reaction are discussed using gas chromatography method. The influence of n-hexane and butyl acetate, as organic solvents, on biocompatibility was studied; the influence of methanol, ethanol, glycol, n-butanol and 1-hexanol, as energy substance, on the transformation efficiency was compared, respectively; the catalysis capabilities of Baker's yeast, XST-KO yeast, LP yeast, alcohol yeast, dry yeast, Saccharomyces cerevisiae, Angel yeast and Meishan yeast were discussed. It has been proved that biocompatibility of n-hexane are much better than that of butyl acetate, and the hexane has been demonstrated the most effective in terms of the influence on biotransformation, Baker's yeast has shown the highest tranformation efficiency among the eight yeast strains.
以香叶醇转化为香茅醇作为模型反应,通过气相色谱法进行定性和定量分析研究了影响该有机相生物转化反应的几个基本因素,考察了两种有机溶剂正己烷和乙酸丁酯对生物相容性的影响,选用甲醇、乙醇、乙二醇、正丁醇和l-己醇分别作为能量物质进行实验,比较其对转化的影响并探讨了Baker's酵母、XST-KO酵母、LP酵母、酒精酵母、假丝酵母、干酵母、安琪酵母和梅山酵母八种不同酵母作为生物催化剂对模型反应的催化能力,结果表明,正己烷作为有机溶剂,其生物相容性明显好于乙酸丁酯,更加有利于该生物转化反应进行;乙二醇作为能量物质,该模型反应转化率最高;而 Baker's酵母作为生物催化剂,对该模型反应的催化能力最强,最适合作为该模型反应的催化剂。
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But I won't object if CJ Internet proved me wrong again by making it available earlier.
不过我很乐意CJ Internet再次证明我的错误判断。
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ZTC1+1 Clarifier was proved to fit for the clarification of this beverage.
ZTC1+1Ⅲ型的澄清效果最好,且对其功效成分损失最少。
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Moreover SVM, a machine learning method is introduced to study the features of Chinese person names recognition. By the aid of this statistic classification technique, it is proved that SVM is also feasible to recognize Chinese person names.
此外,论文还引入了支持向量机学习方法,从统计学分类的角度探讨中文姓名与非中文姓名在若干特征上的差异,验证应用支持向量机理论识别中文姓名的可行性。
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The structure theorem is obtained by defining "ternary ordered partition method" which is used to choose the test-sets of the first $k$ tests, and by defining two operations and two relations on feedback sequences; The isomorphism classification theorem is strictly proved by virtue of the structure theorem, thus the complicated problem of discussing $3^k$ possible search domains is reduced to the relatively easy problem on $k+1$ representative search domains; By the techniques of "super-coin construction method" and "image-union method", the search problem on $k+1$ representative search domains is reduced to the simple verification of several conditions on finite space of small cardinality.
通过引入用于选取前$k$次试验的试验集的"三元有序剖分法"以及关于反馈序列的两种运算和两种关系,得到了结构定理;基于结构定理严格地证明了同构类定理,从而将必须针对$3^k$个搜索域的复杂问题转变为讨论$k+1$个具代表性的搜索域的相对简单的问题;通过"构造超币法"和"并像法"等技术手段,将关于$k+1$个具代表性的搜索域的搜索问题转化为简单的关于势非常小的有限空间的几个条件的验证问题。
- 相关中文对照歌词
- Proved You Wrong
- Nothing Has Been Proved
- 推荐网络例句
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I didn't watch TV last night, because it .
昨晚我没有看电视,因为电视机坏了。
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Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.
今年以来,在北京的很多小区里,电梯液晶电视被撤了下来。
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I'm running my simile to an extreme.
我比喻得过头了。