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IEEE International Conference on Mathematical Methods in Electromagnetic Theory (MMET)

作者： Kochetova, Lyudmila A. NASU Inst Radiophys & Elect Dept Quasi Opt IRE NASU Kharkov Ukraine

An analytical algorithm for solution of the diffraction problem on the PEC bars grating with a nonlinear dielectric filling of its slits is constructed. It is based on the solution of the diffraction problem on the PE... 详细信息

ISBN: (纸本)9781509019564

关键词： Nonlinear dielectric filling Kerr-type nonlinearity PEC bars grating analytical algorithm

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Circuit Network Model of Stator Transposition Bar in Large Generators and Calculation of Circulating Current

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 2015年第3期62卷 1392-1399页

作者： Bian, Xu Liang, Yanping Harbin Univ Sci & Technol Harbin 150080 Peoples R China

Calculation of circulating current in transposition bars is important to the transposition-type design of stator windings in large generators. The circuit network model of the stator transposition bar, including only resistance and reactance parameters, is proposed in this paper, and the calculation method for parameters is given. The analytical algorithm of circulating current in stator transposition bars is proposed based on the circuit network model. Contrary to the existing calculation method for circulating current, the presented analytical algorithm is a general and fast method for different transposition types, which can avoid establishing complex 3-D models. In order to validate the proposed analytical algorithm, the strand current and circulating current of less than 540 degrees with a void transposition bar in a water-cooled turbogenerator are calculated by analytical algorithm and 3-D finite-element method.

关键词： analytical algorithm circuit network model circulating current large generator transposition bars

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A fast analytical algorithm for generating CGH of 3D scene

A fast analytical algorithm for generating CGH of 3D scene

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Conference on Practical Holography XXIV - Materials and Applications

作者： Liu, Yuanzhi Dong, Jianwen Pu, Yiying Chen, Bingchu He, Hexiang Deng, Zilan Wang, Hezhou Sun Yat Sen Zhongshan Univ State Key Lab Optoelect Mat & Technol Guangzhou 510275 Guangdong Peoples R China

ISBN: (纸本)9780819480156

We present a set of analytical formula on describing the diffraction field of the three dimensional (3D) triangular-mesh-based model. The advantage of the proposed method is that it can avoid using the numerical algorithm - Fast Fourier Transform, which leads to a depth-of-field limitation by the Whittaker-Shannon sampling theorem. We employ the proposed method to generate the hologram of 3D texture model derived from the real scene or 3D design software. In order to further increase the computation speed, we have rendered a real scene by employing the GPU platform. Our homemade GPU algorithm performs hundreds of times faster than those of CPU. As we developed a general phase adjustment technique for polygon-based algorithm, the holographic reconstructed scenes possess high performance.

关键词： Computer generated hologram 3D display analytical algorithm graphic processing units

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The fan-beam short-scan FBP algorithm is not exact

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PHYSICS IN MEDICINE AND BIOLOGY 2015年第8期60卷 N131-N139页

作者： Zeng, G. L. Weber State Univ Dept Engn Ogden UT 84408 USA Univ Utah Dept Radiol Salt Lake City UT 84108 USA

The fan-beam short-scan filtered backprojection (FBP) algorithm is popular in the computed tomography (CT) industry and in clinical applications. This paper points out that the fan-beam short-scan FBP algorithm is not exact, even in an ideal noiseless situation. The error depends on the focal length of the imaging geometry. When the focal length is long enough, the error is small and can therefore be ignored.

关键词： computed tomography image reconstruction fan beam analytical algorithm

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THE PRELIMINARY INQUIRY OF CHLOROPHYLL-A INVERSION ALGORIHTMS APPLICABLE TO GUANTING RESERVOIR

THE PRELIMINARY INQUIRY OF CHLOROPHYLL-A INVERSION ALGORIHTM...

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IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

作者： Xie, Fei Guo, Ziqi Tian, Ye Liu, Caixia Lei, Xia Chinese Acad Sci Inst Remote Sensing Applicat State Key Lab Remote Sensing Sci Beijing 100101 Peoples R China Beijing Normal Univ Chinese Acad Sci Inst Remote Sensing & Digital Earth Beijing 100101 Peoples R China

ISBN: (纸本)9781479911141

Chlorophyll-a is an important index of entrophication. A large number of scholars have engaged in studying Chl-a inversion methodologies in the heavily polluted case II waters. However, the low-level-polluted case II waters haven't been paid enough attentions. In this study, we chose Guanting Reservoir, China, a low-level-polluted case II water area, as our study field. Then, we modeled three algorithms (original three-band algorithm, enhanced three-band algorithm and analytical algorithm) to retrieve Chl-a concentration. The results show that the Chl-a concentration predicted by the enhanced three-band algorithm is much more correlated with the measured Chl-a concentration (R2=0.843, RMSE=1.98) than the original three-band algorithm (R2=0.802, RMSE=2.15) and analytical algorithm (R2=0.836, RMSE=2.24). So, the enhanced three-band algorithm is the most applicable method of these three algorithms and has the potential applied in the inversion of Chl-a concentration in low-level-polluted case II waters.

关键词： case II water low-level polluted original three-band algorithm enhanced three-band algorithm analytical algorithm

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Theoretical and experimental analysis of a three-phase permanent magnet claw-pole synchronous generator

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IET ELECTRIC POWER APPLICATIONS 2012年第8期6卷 491-503页

作者： Jurca, F. N. Martis, C. Tech Univ Cluj Napoca Dept Elect Machines & Drives Cluj Napoca Romania

The present study deals with the theoretical and experimental analysis of a permanent magnet claw-pole synchronous generator (PMCPSG) suited for small rating, direct-driven applications, such as small-scale wind power plants. After the computation of the machine main dimensions using an analytical algorithm, a Hooke-Jeeves optimisation procedure was implemented in order to obtain the optimal geometry of the PMCPSG. The electromagnetic field and static performances are studied, based on three-dimensional finite element analysis. A prototype of the PMCPSG is tested on a test bench for resistive and inductive loads.

关键词： Optimisation techniques optimal geometry Hooke-Jeeves optimisation procedure small-scale wind power plant resistive load Combinatorial mathematics Finite element analysis inductive load electromagnetic field electromagnetic fields theoretical analysis analytical algorithm three-phase permanent magnet claw-pole synchronous generator test bench experimental analysis machine main dimension computation static performance three-phase PMCPSG permanent magnet generators Synchronous machines synchronous generators direct-driven application geometry three-dimensional finite element analysis optimisation finite element analysis

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Comments on "An analytical algorithm for generalized low-rank approximations of matrices"

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PATTERN RECOGNITION 2008年第6期41卷 2133-2135页

作者： Hu, Yafeng Lv, Hairong Zhang, Xianda Tsinghua Univ Dept Automat Beijing 100084 Peoples R China

Low rank approximations of matrices have been widely used in pattern recognition and machine learning. Based on a sequence of matrices, a generalized low rank approximation problem was presented and an iterative scheme was given by Liang and Shi recently proposed an analytical scheme for this approximation problem. In this paper, we identify the weakness in their scheme and prove that their algorithm is incorrect. (C) 2007 Elsevier Ltd. All rights reserved.

关键词： low rank approximation analytical algorithm iterative algorithm

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analytical Design algorithm of Planar Inductor Layout in CMOS Technology

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IEEE TRANSACTIONS ON ELECTRON DEVICES 2008年第11期55卷 3208-3213页

作者： Hsu, Heng-Ming Chan, Kai-Yuen Chien, Hung-Chi Kuan, Han-Chien Natl Chung Hsing Univ Dept Elect Engn Taichung 40227 Taiwan

A layout design algorithm for a variable-width inductor is proposed to minimize metal resistance. For a given chip area, the proposed algorithm can rapidly design metal widths of each coil in a planar inductor due to the analytical form. Two on-chip inductors with identical chip areas and inductance are fabricated to verify the proposed method in foundry 90-nm CMOS technology. Measurement results demonstrate that the improvement of metal resistance in the proposed device is approximately 19%. The results of this paper provide an effective algorithm to design a high-Q inductor for RFIC applications.

关键词： analytical algorithm minimum resistance on-chip inductor variable width

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On the strength of polycrystals of boron nitride dense modifications

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JOURNAL OF SUPERHARD MATERIALS 2009年第3期31卷 165-171页

作者： Golovchan, V. T. Natl Acad Sci Ukraine Bakul Inst Superhard Mat UA-04074 Kiev Ukraine

An analytical algorithm for the calculation of stresses in polycrystals of boron nitride dense modifications has been described. The relations established between the tensile and compression strength have been based on the Griffith fracture hypothesis for a biaxial stressed state. The effect has been taken into account of technological residual thermal stresses, which are formed in wurtzitic boron nitride (wBN) grains in sintering at the stage of cooling because of the thermal expansion anisotropy, on the strength of wBN.

关键词： analytical algorithm polycrystal cubic boron nitride wurtzitic boron nitride tensile strength compression strength

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Design of on-chip transformer with various coil widths to achieve minimal metal resistance

IEEE ELECTRON DEVICE LETTERS

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IEEE ELECTRON DEVICE LETTERS 2007年第11期28卷 1029-1032页

作者： Hsu, Heng-Ming Tseng, Chien-Wen Natl Chung Hsing Univ Dept Elect Engn Taichung 40227 Taiwan

A layout design algorithm of a variable-width transformer is proposed to minimize metal resistance in this letter. The proposed algorithm can rapidly design metal widths in each coil of a planar transformer for a given chip area. Two on-chip transformers with identical self-inductance are fabricated to verify the proposed algorithm in 90-nm CMOS technology. Measurement results demonstrate the improvement of metal resistance approximates to the value of 11.6%. Results of this study provide an effective algorithm to design a minimal-loss transformer for radio frequency integrated circuit applications.

关键词： analytical algorithm minimum resistance on-chip transformer variable metal width

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