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In this paper,a design method of two dimensional Linear Phase Nearly Perfect Reconstruction filter banks based on a new class of cosine modulation systems is presented,which can be described as follow: firstly,the Parks-McClellan algorithm is adopted for designing the prototype filter,then by employing cosine modulation,a series of analysis and synthesis filters can be obtained,accordingly a one-dimensional LP-NPR filter banks can be constructed;Secondly,cascading two one-dimensional LP-NPR filter banks in the form of tree structure and using the unimodular transformation,a two dimensional nonseparable LP-NPR filter banks can be obtained.
提出了一种基于一类新余弦调制系统的二维线性相位-近似完全重构滤波器组的设计方法,设计过程分为两个步骤:首先采用Parks-McClellan算法来计原型滤波器,再经过余弦调制能到一系列的线性相位分析和综合滤波器,从而可以构造一维LP-NPR滤波器组;然后利用树状结构来结合两个一维LP-NPR滤波器组,并运用单位模变换,可以得到二维不可分离LP-NPR滤波器组。
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A surface is derived from a set of contours which outlines the edge of a volume on a series of planar images.
一个平面起自一组轮廓线,这组轮廓线勾勒出了一系列平面图像的三维边缘。
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Empirical evidence in this paper shows that the price of A shares in Shanghai and Shenzhen Stock market is inconstant with the random walk model, and that low-dimension deterministic chaos process are found in the time series of Shanghai A shares index with a Correlation Dimension of 1.4, which means that the degree of randomness is lower than that of grown-up capital markets, and so the lower of the efficiency degree to some extent.
本论文所做的实证研究表明,沪深A股市场价格并不呈随机行走状态,而是存在非线性结构;上海A股市场指数收益率序列存在低维确定性混沌过程,其维数大约为1.4,这一数值远低于成熟资本市场的指标,这表明上海股票市场指数收益率序列随机性低于成熟资本市场。
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The corresponding diagnosable systems are characterized in terms of a graph-theoretic condition, and a series of valuable conditions on a diagnosable system is presented. And a class of diagnosable systems that have a minimum number possible of communication links (known as optimal diagnosable systems) is proposed.
得出了系统中故障结点机数不超过n-2的结论;●解决了特征问题,给出了按图论方式表述的充分必要条件;●解决了诊断算法问题,给出了一个有效的诊断算法,该算法具有线性时间复杂度和多项式诊断报文总规模的特性;目前,上述研究工作所取得的结果还没有文献报导。
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A kind of additive with phosphorus EA-1 has been prepared, and a series of properties of EA-1 have been determined. The results show that EA-1 not only acts as a kind of brightener and smoother, but also acts as a source of phosphorus in zinc base alloy electrodeposit.
首次运用C语言编程对添加剂的感官指标进行模糊评定,所得结果不但能客观真实迅速地评定添加剂的作用效果,而且为添加剂的质量评定提供了一种有效的方法。
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A method for shifting a pitch of acoustic signals, which are expressed in terms of a series of digital signals, to an optional pitch, uses a compacting and/or expanding process on the time axis and cross-fades a fade-in acoustic signal, stored in a memory.
一种音程变换方法,用时间轴压缩扩展和交叉渐变处理将数字信号序列表示的音响信号的音程变换为任意音程。将音响信号存储到存储器中。
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A series of internal documents from the late 1970s and early 1980s shows that BAT at least thought about applying this knowledge to cigarette design. A research report from 1979 puts it thus: There are three major design features which can be used either individuallyorin combination to manipulate delivery levels; filtration, paper permeability, and filter-tip ventilation. A conference paper from 1983 says, The challenge would be to reduce the mainstream nicotine determined by standard smoking-machine measurement while increasing the amount that would actually be absorbed by the smoker. Another conference paper, from 1984, says:(5)We should strive to achieve this effect without appearing to have a cigarette that cheats the league table. Ideally it should appear to be no different from a normal cigarette...
英美公司上世纪70年代末、80年代初的一系列内部文献表明,该公司至少曾考虑过将这一知识用于卷烟设计。1979年的一份研究报告上这样说道:可分别或联合应用与设计有关的三个要素,即过滤、烟卷包装纸的通透性以及过滤嘴的通气效果,来控制焦油和尼古丁的释放水平。1983年一份会议论文也提到,关键在于,要在提高吸烟者尼古丁实际吸收量的同时,减少可被标准检测方法测定到的含量。1984年另一份会议论文说:我们应当努力达到这一效果并能在检测中蒙混过关。
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Composed of glacial ice is a longer period of time pressed through the snow, freezing, re-crystallization process of the formation of a series of ice the lower body has a certain plasticity, in its own pressure and gravity Next, along the valley slope or flow slowly, thus the formation of a glacier.
组成冰川的冰体是由积雪经较长时间的压紧、冻结、重新结晶等一系列过程形成的,冰体的下部具有一定的可塑性,在其自身的压力和重力作用下,沿斜坡或谷地缓慢地流动,这样就形成了冰川。
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On the second Business Day following the Acceptance Date if there occurs: an introduction of any new law or regulation or any change in existing law or regulation (or the judicial interpretation thereof); or any local, national or international event or change (whether or not forming part of a series of events or changes occurring or continuing before, and/or after the date of the Underwriting Agreement) of a political, military, inancial, economic or currency (including a change in the system under which the value of the Hong Kong currency is linked to the currency of the United States of America) or other nature (whether or not such are of the same nature as any of the foregoing) or of the nature of any local, national or international outbreak or escalation of hostilities or armed conlict, or affecting local securities market; or any act of God, war, riot, public disorder, civil commotion, ire, lood, explosion, epidemic, terrorism, strike or lock-out; and in the reasonable opinion of the Underwriter, such change would have a material and adverse effect on the business, inancial or trading position or prospects of the Group as a whole or the success of the Rights Issue or make it inadvisable or inexpedient to proceed with the Rights Issue.
董事谨请阁下尤其注意倘出现下述情况,包销商有权于接纳日期后第二个营业日下午四时正前随时书面通知本公司终止包销协议所载之安排:颁布任何新法例或法规或修改现有法例或法规;或任何当地、全国或国际政治、军事、金融、经济或货币事件或转变(包括港元与美元之联系汇率制度改变)或其他性质(不论是否与任何上述性质相同)之事件或转变(不论是否属于包销协议日期前及/或后出现或持续之一连串事件或转变),或任何当地、全国或国际敌对事件或军事冲突爆发或升级或影响当地证券市场之事件或转变;或任何天灾、战争、动乱、公众骚乱、民众暴乱、火灾、水灾、爆炸、疫疾、恐怖袭击、罢工或停工;而包销商合理地认为上述转变会对本集团整体业务、财务或经营状况或前景或供股之顺利进行有重大不利影响,或使供股不宜或不应进行。
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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。
- 推荐网络例句
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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.
随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。
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But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.
不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。
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Closes the eye, the deep breathing, all no longer are the dreams as if......
关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。