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Longitudinal and Transverse Incremental Permeability in Mu-metal Thin Films

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Journal of Materials Science & Technology 2000年第2期16卷 197-198页

作者： W.S. Cho, T.S. Yoon and C. O.Kim (Division of Material Eng., chungnam natl. univ., Taejon 305-764, Korea) H.B.Lee (Department of Physics Education, Kong in Nail. univ., Kongju 314-701, Korea) Division of Material Eng. Chungnam Natl. Univ. Taejon 305-764 South Korea Department of Physics Education Kongju Natl. Univ. Kongju 314-701 South Korea

The transverse permeability ratio (TPR) and longitudinal permeability ratio (LPR) as a function of an external field of mumetal films have been investigated in conjunction with the magnetic properties. The mumetal films were prepared by the *** sputtering method in Ar atmosphere. The LPR curve shows the single peak pattern, and the TPR curve shows the double peak pattern indicating the existence of the magnetic anisotropy effect. The magnitude of the incremental permeability are strongly depended on the magnetic softness. The large changes of LPR and TPR in low external fields can be useful for the evaluation of the magnetic softness.

关键词： Thin In Longitudinal and Transverse Incremental Permeability in Mu-metal Thin Films

Fabrication of Meander and Spiral Type Micro Inductors

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Journal of Materials Science & Technology 2000年第2期16卷 236-237页

作者： T.S. Yoont, W.S. Cio and C. O.Kim (Division of Material Eng., chungnam Nail. Unly., Taejon 305-764, Korea) H. w. hag (Dept. of Electronic Communication, Juseong College, Chungbuk 363-794, Korea) Y.H.Kim (Dept. of Electrical Eng., Pukyong Nail. Unly., Pusan, 608-737, Korea) Division of Material Eng. Chungnam Natl. Univ. Taejon 305-764 South Korea Dept. of Electronic Communication Juseong College Chungbuk 363-794 South Korea Dept. of Electrical Eng. Pukyong Natl. Univ. Pusan 608-737 South Korea

To obtain microstructure of magnetic devices, the thin film inductors were fabricated by the process such as thin film manufacturing, photolithography and wet etching. The frequency characteristics of these devices are measured at high frequency range. When the inductor sizes of the spiral and the meander type are same, the inductance and the quality factor of the spiral type inductor are larger than those of the meander type inductor, but the driving frequency of the spiral type inductor is lower than that of the meander type inductor.

关键词： In Fabrication of Meander and Spiral Type Micro Inductors

THERMODYNAMIC　AND　STRUCTURAL　CHEMISTRY　DISCUSSIONS　FOR　OXIDATIVE　LEACHING　OF　Cu－Ni　SULPHIDE　ORE　UNDER　ATMOSPHERIC　PRESSURE

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中国有色金属学会会刊：英文版 1995年第3期5卷 29-33,36页

作者： Wenjian, Wu Zhong, Chen Songqing, Yang Hanying, Jiang natl univ of Defense Technology Changsha China

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关键词： Cu-Ni sulphide ore leach ferric chloride nitric acid

A THIRD-ORDER BOUSSINESQ MODEL APPLIED TO NONLINEAR EVOLUTION OF SHALLOW-WATER WAVES

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Journal of Hydrodynamics 2000年第2期12卷 107-126页

作者： Zhang Ying long CCM MINDEF, Department of Mech. and Prod. Eng., National university of Singapore, 10 Kent Ridge Crescent, Singapore 119260 Zhu Song ping Department of Mathematics, the university of Wollongong, Wollongong, NSW 2522, Australia natl univ of Singapore Singapore Singapore

The conventional Boussinesq model is extended to the third order in dispersion and nonlinearity. The new equations are shown to possess better linear dispersion characteristics. For the evolution of periodic waves over a constant depth, the computed wave envelops are spatially aperiodic and skew. The model is then applied to the study of wave focusing by a topographical lens and the results are compared with Whalin′s (1971) experimental data as well as some previous results from the conventional Boussinesq model. Encouragingly, improved agreement with Whalin′s experimental data is found. [WT5”HZ]

关键词： shallow water waves nonlinearity evolution third order Boussinesq model

FIVE MODE INTERACTIONS IN A FREE SHEAR LAYER

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Journal of Hydrodynamics 1998年第3期10卷 45-61页

作者： Taewon SeoSchool of Mechanical Eng. ,Andong National univ. , South KoreaWang Xing-kui, Wang Guang-qianDepartment of Hydraulic Eng. ,Tsinghua univ. , Beijing 100084, P.R.China Andong natl univ Andong South Korea

This study condiders spatially developing free shear layers at moderate Reynolds numbers that are formed by the merging of two free streams initially separated by a splitter plate. To study the nonlinear interactions between the two- and three-dimensional fundamental and subharmonic modes in the spatially developing shear layer, the selected five modes represent the minimum number that needs to be considered. The objective of this study is to investigate the nonlinear effects arising from the interactions between two- and three-dimensional large-scale coherent structures in a free shear layer. Our attention is focused on the energy exchange mechanisms between the various modes, and the effects of the nonlinear evolution of the phases of the interacting modes. It is shown that depending on the initial modal phase angles the downstream growth of the shear layer and the associated local entrainment can be strongly affected by the presence of these nonlinear interactions. This high sensitivity of the shear layer growth is limited to a narrow band of initial phase angle values.

关键词： model interaction free shear layer

Application　of　Heterogeneous　Multiple　Feature　Data　Fusion　to　Multitarget　Association　and　Tracking

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Journal of Systems Engineering and Electronics 1998年第3期9卷 52-60页

作者： Hongwei, Cheng Yiyu, Zhou Zhongkang, Sun natl univ of Defense Technology Changsha China

In this paper we discuss a kind of multitarget tracking and association method based on the data fusion of heterogeneous multiple feature data gained by a sensor such as space state, signal amplitude, Doppler frequency and so on. In order to introduce quantitatively those heterogeneous multiple feature data which are possibly gained by a sensor into the discussion of tracking and association problem, we define a correlation measure which we explain as the generalization of conventional association decision. In conventional Nearest Neighbor method, the decision function can take only two values, 1 or 0, to represent the decision of association or not association. In our method, correlation measure can be take any real value from 0 to 1 to represent the extent of correlation. Considering the practical circumstances that some feature data might not be easily gained continuously, we introduce an effective factor to deal with these cases. In the paper we also discuss the comparative computer simulation tests and give the results.

关键词： Computer simulation Correlation theory Radar target recognition Signal processing Tracking (position)

On the Small SNR Processing Ability of IR Point Target Detection

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Journal of Systems Engineering and Electronics 1993年第3期4卷 28-36页

作者： Song, Liuping Sun, Zhongkang natl univ of Defense Technology Changsha China

Three-dimensional (3-D) matched filtering has been suggested as a powerful processing technique for detecting weak, moving IR point target immersed in a noisy field. Based on the theory of the 3-D matched filtering and the optimal linear processing, the optimal point target detector is being analyzed in this paper. The performance of the detector is introduced in detail. The results provide a standard reference to evaluate the performance of any other point target detection algorithms.

关键词： Algorithms Correlation detectors Digital signal processing Image processing Signal detection Signal to noise ratio Systems analysis Three dimensional

Mathematical Simulating Model of Phased-Array Antenna in Multifunction Array Radar

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Journal of Systems Engineering and Electronics 1999年第1期10卷 39-43页

作者： Wang, Guoyu Zhang, Jun Ma, Jianwu natl univ of Defence Technology Changsha China

A mathematical simulating model of phased-array antenna in multifunction array radar has been approached in this paper, including the mathematical simulating model of plane phased-array pattern, the mathematical simulating model of directionality factor, the mathematical simulating model of array factor, the mathematical simulating model of array element factor and the mathematical simulating model of beam steering.

关键词： Antenna phased arrays Directional patterns (antenna) Mathematical models

PASSIVE LOCATION AND TRACKING USING DOA AND TOA MEASUREMENTS OF SINGLE NONMANEUVERING OBSERVER

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Chinese Journal of Aeronautics 1990年第1期5卷 34-41页

作者： Zhongkang, Sun Ming, Zhang natl univ of Defense Technology Changsha Hunan China

Passive location and tracking (PLAT) of a moving emitter can be implemented by multi-sited observers or by single maneuvering observer using DOA measurements only. In this article, the principle and method of passive location and tracking of a moving emitter by a single non-maneuvering observer using DOA and TOA measurements are presented and described. Computer simulation of PLAT of a moving emitter in two dimensional plane was implemented. It is shown that convergent and accurate tracking data can be obtained.

关键词： Computer Programming Algorithms Computer Simulation Signal Filtering and Prediction Kalman Filtering