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By using this method, the angular frequency, amplitude, initial phase angle, decay constant of each component in transient voltage and/or current waveforms can be precisely extracted. Also, all other kinds of transient procedure can be analyzed by this method. Thirdly, a new definition of generalized instantaneous reactive power and generalized instantaneous reactive current in dq0 coordinates under any nonsinusoidal and unbalanced three-phase circuit is proposed for the first time. The detection and compensation method for different instantaneous reactive currents are also concerned.
本文首先提出了用于快速高精度频谱分析的一种改进快速傅立叶变换方法,该法具有速度快、精度高、抗混迭、不受采样定理约束、可以分析出谐次大于N/2的频谱系数等特点,可方便地应用于电力系统谐波分析及其它各类频谱分析;然后提出了基于非线性最小二乘优化法的电力系统暂态波形分析方法,可准确求出电力系统暂态电压、电流波形中各个分量的角频率、幅值、初相角及衰减常数,并可广泛应用于各类暂态过程波形分析。
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In this paper, a modified multi-zone coupling method is presented for simulating the integrated flowfield of annual combustors, the SIMPLE-ENC algorithm is presented to achieve higher accuracy, and the wall function method in arbitrary curvilinear coordinates for treating near wall region is given here.
针对燃烧室多连通域的特点,本文采用分区法生成网格,并且提出了一种即时传递信息的改进多区域耦合法求解燃烧室整体流场,该法已成功地应用于涡扇和涡轴发动机环形燃烧室整体流场计算;本文提出了计算流场的SIMPLE-ENC算法,显著提高了流场计算的收敛速度;本文详细描述了壁面函数在空间任意曲壁上的应用方法。
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By introducing cybernetics into water resource research, critical cybernation and mathematic representation are presented, at the premise of improving agricultural utilization water efficiency, effective method of agricultural utilization water control is used, which provide scientific ground for rational distribution of Yellow River water.
5将控制论引入到水资源研究中,创造性的提出了临界控制及其数学表达,提出以提高农业用水效率为前提的农业用水控制的有效途径,为黄河水量合理分配提供了科学依据。
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First,this dissertation presents a new method of cyclic spectra estimation which uses time aliasing method and sidelobe eliminated ssinc window which were presented by Smith in 1994 in it.
首先,本文将1994年Smith提出的时间重叠法和具有旁瓣抑制能力的ssinc窗应用于循环谱估计中,提出了TA循环谱估计方法。
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In this thesis, we implement a computational procedure to categorize and classify 3-D objects from their contour under a simple environment. First, we use foreground detection, Canny edge detection and speedy GVF snake to obtain the object's contour. The contour is then used to establish the object's features. Two databases are built using methods which compute similarity by modified aspect-combination algorithm proposed by Cyr and Kimia and new proposed aspect-combination algorithm. By using these two databases, we recognize 3-D objects using four recognition methods and compare their performance. Finally, a conclusion is made that our newly proposed algorithm is better than the modified algorithm proposed by Cyr and Kimia.
在本论文中,对一个在单纯环境下的三维物体,由撷取到辨识出此物体做了一个完整的实现,首先,利用前景侦测结合肯尼边缘侦测法和加速的梯度向量流动态轮廓侦测法,来得到物体轮廓,接著利用此轮廓找寻出物体的特徵,然后配合计算相似度的方法,代入修改后的Cyr and Kimia的外观结合演算法(aspect-combination algorithm)和新提出的外观结合演算法去建资料库,然后,对於三维物体则依据两种不同方法所建出的资料库,利用四种辨识的方法来辨识并比较其结果,最后得出新提出的外观结合演算法是优於修改后的Cyr and Kimia的外观结合演算法的结论。
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As a contribution to the control domain, based on the DAA (Disturbance Attenuation Approach) of H〓 theory, a new method to design hydraulic turbine governors is proposed.
基于本文提出的水电机组的状态评估,提出了经济性能维护的维护策略,并用案例说明了该策略的实施。
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There are two micro-patterns used to analyse the optimal problem in macro-economics:One is the indefinite pattern put forward by Lamsy;and second is the overlap pattern put forward by Samurson and Daimon.
在宏观经济学中常使用两个以微观为基础的基本模型来分析消费和投资的优化问题:其一是拉姆赛提出的无限期界模型;其二是萨缪尔森和戴蒙得提出的世代交叠模型。
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Catholic missionaries to Tibet in the early part of the last century were struck by the outward resemblances to Catholic liturgy and discipline that were presented by Lamaism-its infallible head, grades of clergy corresponding to bishop and priest, the cross, mitre, dalmatic, cope, censer, holy water, etc. At once voices were raised proclaiming the Lamaistic origin of Catholic rites and practices.
天主教传教士在西藏早期的一部分,过去一个世纪是深刻的外向相似之处天主教礼仪和纪律,提出了喇嘛教,其可靠的头部,等级的神职人员相应的主教和神父,两岸,迈特, dalmatic ,应付,香炉,圣水等在声音再次提出了宣布Lamaistic原产地的天主教仪式和做法。
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Be like Internet new definition put forward, of Internet Darwinism put forward to wait a moment.
如互联网新定义的提出,互联网进化论的提出等等。
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At the same time, the paper study network Knowledge Discover in Dat...
在此基础上,提出了基于互联网的顾客关系管理系统,给出了系统总体设计框架,针对金牌公司开展了以顾客信息管理为基础的顾客关系管理系统的应用研究,并提出了提高公司CRM系统应用水平的措施。
- 推荐网络例句
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The split between the two groups can hardly be papered over.
这两个团体间的分歧难以掩饰。
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This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.
这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。
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The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.
聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力