检索结果-内蒙古大学图书馆

Indium Phosphide and Related Materials Conference

作者： D.I. Babic K. Streubel R.P. Mirin J. Piprek N.M. Margalit J.E. Bower E.L. Hu D.E. Mars L. Yang K. Carey Department of Electrical and Computer Engineering University of California Santa Barbara USA Department of Electronics Royal Institute of Technology Stockholm Sweden Materials Science Program University of Delaware Newark USA Hewlett Packard Laboratories Palo Alto CA USA

The progress in understanding wafer-fused vertical-cavity lasers and improvements in fabrication techniques have led to the realization of the first room-temperature continuous-wave operating 1.54-/spl mu/m vertical-cavity lasers. By demonstrating continuous-wave operation at room temperature using vertical-cavity lasers fabricated by two wafer fusion steps, we have shown that wafer fusion is a viable technique. The lasers comprise strain compensated InGaAsP quantum-well active layers sandwiched between two AlGaAs/GaAs quarter-wave mirrors. Characteristics discussed include cavity losses, the gain-current density relationship, and voltage-current characteristics.

关键词： Vertical cavity surface emitting lasers Mirrors Optical pulse generation Absorption Pulse measurements Quantum well lasers Doping Temperature Propagation losses Size measurement

来源：评论

学校读者我要写书评

暂无评论

Characteristics and growth processes of a surface oxidized layer formed on Al-Y alloy films

引用

electronics AND COMMUNICATIONS IN JAPAN PART II-electronics 1996年第9期79卷 78-87页

作者： Takeyama, M Noya, A Murakami, Y Sasaki, K Faculty of Engineering Kitami Institute of Technology Kitami Japan 090 Education: Kitami Institute of Technology B.S. 1991. Academic appointments: Kitami Institute of Technology faculty member 1991 research associate 1993. Research interest: thin films for use in electronics. Membership: Applied Physics Society of Japan. Education: Muroran Institute of Technology B.S. 1974 Hokkaido University D.Eng. 1980. Academic appointments: Kitami Institute of Technology research associate (1980) lecturer (1990) associate professor (1991) professor (1994). Research interests: thin films especially in electronics and their evaluation. Membership: Applied Physics Society of Japan. Education: Kitami University of Technology B.S. 1994 master's degree in progress. Research interest: thin-film materials for electronics. Membership: Applied Physics Society of Japan. Education: Hokkaido University B.S. 1967 Hokkaido Institute of Electrical Engineering graduate program D.Eng. Academic appointments: Kitami Institute of Technology lecturer (1975) associate professor (1979) professor (1990). Research interests: thin-film materials for electronics electronic properties of materials LSI thin-film technology. Memberships: Applied Physics Society of Japan Japan Chemical Society.

The formation process as well as the characteristics of a surface oxidized layer formed on Al-Y alloy films are examined. Al in the alloy forms a thin Al2O3 layer due to more oxidation Pt the alloy surface. In an alloy of Al-rich composition, if the Al2O3 surface layer (which is comparable to that formed on pure Al) is formed, the layer maintains its ability to be a self-passivating oxide layer. In those alloys that form an unduly thin Al2O3 surface layer, introduction of oxygen from the ambient environment cannot be curtailed. As a result, oxidation proceeds and the formation of Y2O3 and reduced Al is observed within the oxide layer. In the oxidized layer, the oxidation state of the lesser amount of oxide is affected by that of the greater amount oxide;this reflects a shift in binding energy of the XPS spectra for the minor element. It is shown that the formation process of the alloy is dominated by the differences of ionization potential, an element affinity, formation heat, a diffusing species and the transport behavior of cations and/or anions.

关键词： Al-Y alloy films self-passivating oxide layer XPS spectra

来源：评论

学校读者我要写书评

暂无评论

Finite element analysis of plane wave diffraction from anisotropic dielectric gratings

引用

electronics AND COMMUNICATIONS IN JAPAN PART II-electronics 1996年第1期79卷 1-10页

作者： Ohkawa, Y Tsuji, Y Koshiba, M Faculty of Engineering Hokkaido University Sapporo Japan 060 Received his B.S. and M.S. degrees in 1991 and 1993 respectively from the Department of Electronic Engineering Hokkaido University where he is currently in the doctoral program. He has been engaged in research on opto- and wave electronics. Currently in the doctoral program at Hokkaido University (Department of Electronic Engineering) where he received his B.S. and M.S. degrees in 1991 and 1993 respectively. He has been engaged in research on quantum wave phenomena in semiconductor nanostructures such as quantum wires and quantum dots. Received his B.S. M.S. and Ph.D. degrees in 1971 1973 and 1976 respectively from the Department of Electronic Engineering Hokkaido University. In 1976 he became a Lecturer at Kitami Institute of Technology where he was promoted to an Associate Professor in 1977. In 1979 he became an Associate Professor of the Department of Electronic Engineering Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on opto- and wave electronics. In 1987 he received a Best Paper Award. He is the author ofFundamentals of Finite Element Method for Opto- and Wave Electronics(Morikita)Optical Waveguide Analysis(Asakura)Optical Waveguide Analysis (McGraw-Hill) andOptical Waveguide Theory by the Finite-Element Method(KTK Scientific Publishers/Kluwer Academic Publishers). He is the co-author of one book and jointly authored six others. He is a member of the Institute of Television Engineers of Japan the Institute of Electrical Engineers of Japan the Japan Society for Simulation Technology the Japan Society for Computational Methods in Engineering and the Japan Society of Applied Electromagnetics. He is also an IEEE Senior Member.

In this paper, the formulation of the analysis based on the finite element method is presented for the first time for an anisotropic dielectric grating. By this analysis method, the diffraction characteristics of a plane wave by an anisotropic dielectric grating with an arbitrary shape can be computed easily. The finite element method is applied to the region corresponding to one period containing an anisotropic dielectric grating. The analytical relationships are applied to the boundaries on the incident and transmitted sides while the periodic boundary condition is applied to all other boundaries. Specifically, an index modulated grating and a groove grating are chosen for the analysis of the diffraction characteristics when the TE and TM waves are coupled. From the comparison with the analysis results by the coupled-mode theory and the spatial harmonic expansion method, the validity of the present method is confirmed.

关键词： diffraction grating anisotropic medium finite element method isoparametric elements Floquet's theorem

来源：评论

学校读者我要写书评

暂无评论

A finite-element beam-propagation method for strongly guiding optical waveguides with magnetooptic materials

引用

electronics AND COMMUNICATIONS IN JAPAN PART II-electronics 1996年第7期79卷 22-29页

作者： Tsuji, Y Koshiba, M Tanabe, T Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated in 1991 from the Department of Electronic Engineering Hokkaido University and received his M.S. degree in 1993. He is currently working toward a doctoral degree. He has been engaged in research on the computer-aided design of optical and quantum-wave phenomena and quantum-effect devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University and received his M.S. and Dr. of Eng. degree in 1973 and 1976 respectively. In 1976 he became a Lecturer at Kitami Institute of Technology where he was promoted to an Associate Professor in 1977. In 1979 he became an Associate Professor in the Department of Electronic Engineering Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on opto- and wave-electronics. In 1987 he received a Best Paper Award. He is the author ofFoundations of Finite Element Method for Opto- and Wave-Electronics(Morikita Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishers/Kluwer Academic Publishers). He has co-authored one book and written Graduated in 1995 from the Department of Electronic Engineering Hokkaido University and is currently in the Master's program. He has been engaged in research on opto- and wave-electronics.

To the best of the knowledge of the authors, the formulation is carried out for the first time on the finite-element beam-propagation method for the analysis of the magnetooptic waveguide in which the structure varies along the propagation direction. The present method is applicable not only to the case in which refractive index difference is small but also to the case for the TE mode and the TM mode propagating in a waveguide with a large refractive index difference. To suppress the spurious reflection from the computational window edges, the transparent boundary condition is applied.

关键词： seam-propagation method finite-element method magnetooptical material optical isolator

来源：评论

学校读者我要写书评

暂无评论

Optimum design technique for optoelectronic devices using simulated annealing

引用

electronics AND COMMUNICATIONS IN JAPAN PART II-electronics 1996年第1期79卷 22-32页

作者： Hara, K Iwamoto, T Kyuma, K Member Semiconductor Research Laboratory Mitsubishi Electric Corporation Amagasaki Japan 661 Received his B.S. and M.S. degrees in Electronics Engineering from Osaka University in 1986 and 1988 respectively. He joined Mitsubishi Electric Corporation in 1988. At present he is with the Neural & Parallel Processing Technology Development Center. He is involved in research on optical switches optical device simulators artificial retina chip and digital neuro-chip. He is a member of the Society of Applied Physics. Nonmember Received his B.S. and M.S. degrees in Physics and Methodology from Kyoto University in 1985 and 1987 respectively. He completed the required course work in the doctoral program of the same university in 1990. He joined Mitsubishi Electric Corporation in 1990. At present he is with the Neural & Parallel Processing Technology Development Center. He is involved in research on information processing using nonlinear motive power and optimization. He is a member of the Japan Society of Physics. Received his B.S. and Ph.D. degrees in Electronics Engineering from Tokyo Institute of Technology in 1972 and 1977 respectively. He joined Mitsubishi Electric Corporation in 1977. At present he is the head of the Neural & Parallel Processing Technology Development Center. From 1985 to 1986 he was an invited scholar at California Institute of Technology in the United States. He is involved in research on neural theory optical neural networks artificial retina chip VLSI neuro-chips and optical fiber sensors. He is a member of IEEE OSA International Neural Network Society Society of Applied Physics and Society of Instrumentation and Control.

A new procedure for the optimum design of optoelectronic devices is explained in this paper and an automatic search is made simultaneously for the structure satisfying various demands. The feature of this procedure is in the introduction of cost by which the quantitative evaluation of the structure becomes possible and the global search for the required structure by simulated annealing can be carried out. First, the definition of cost and details of the optimization procedure are clarified. In optimization, in addition to convergence to the minimum point of the cost function (the optimum configuration from theoretical viewpoint), the convergence also is possible in structures with great tolerance to fabrication errors (neighborhood cost (NC) and finite temperature annealing (FTA) methods). Next, these three proposed methods are used in the design of a pnpn differential optical switch and the effectiveness of the methods is verified. The method of cost expression, the relation between annealing parameters, and convergence are investigated. It is shown that cost expression with large degree of freedom improves the search for high-performance structures and the initial temperature of annealing or the fixed temperature of FTA method is the important parameter which sets up the probability of acceptance. Further, it is shown that the convergence cost is inversely proportional to the time spent in annealing. These results are useful guidelines in the optimum design of arbitrary optoelectronic devices.

关键词： optoelectronic devices cost function device design optimization convergence

来源：评论

学校读者我要写书评

暂无评论

Analysis of nonreciprocal mode-conversion properties of magnetooptic channel waveguides using the finite element method

引用

electronics AND COMMUNICATIONS IN JAPAN PART II-electronics 1996年第10期79卷 32-39页

作者： Zhuang, XP Koshiba, M Tsuji, Y Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated from the Department of Communication Engineering Guellin Electronic Institute China in 1986. She received her M.S. degree from Hokkaido University in 1991 and was admitted to the doctoral program. She has been engaged in research on the optimum design of magnetooptic waveguides for nonreciprocal optical devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1973 and his Dr. of Eng. degree in 1976. In 1976 he became a Lecturer in the Department of Electronic Engineering Kitami Institute of Technology where he was promoted to Associate Professor in 1977. In 1979 he became an Associate Professor at Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on optical and wave electronics. In 1987 he received a Best Paper Award. He is the author ofFundamentals of Finite Element Method of Optics and Waves(Morigkata Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishing/Kulwer Academic Publishers). He is also co-author of one book and has written chapters in six other books. He is a member of the Institute of Television Engineers of Japan the Institute of Electrical Engineers of Japan the Japan Society for Simulation Technology the Japan Society for Computational Methods in Engineering and the Japan Society of Applied Magnetics and Mechanics. He is also an IEEE Senior Member. Graduated in 1991 from me Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1993. He is currently in the doctoral program. He has been engaged in research on quantum wave phenomena and computer-aided design of optical and quantum effect devices.

To evaluate nonreciprocal mode conversion characteristics in a magnetooptic channel waveguide, a finite element analysis based on the scalar wave approximation is formulated for the first time. A simple iterative calculation method is conceived for solution of the nonlinear eigenvalue equations finally obtained in which the two polarizations are coupled. Specifically, the maximum isolation ratio in the mode-conversion-type magnetooptic rib guide was evaluated and the validity of the method is confirmed by comparison with published experimental results.

关键词： nonreciprocal optical devices magnetooptic waveguide nonreciprocal mode conversion finite element method numerical analysis

来源：评论

学校读者我要写书评

暂无评论

Scattering parameter estimation accuracy of Root-MUSIC algorithms in electromagnetic wave scattering measurements

引用

electronics AND COMMUNICATIONS IN JAPAN PART II-electronics 1996年第5期79卷 106-115页

作者： Yamada, H Yamamoto, K Yamaguchi, Y Sengoku, M Faculty of Engineering Niigata University Niigata Japan 950-21 Received his B.S. M.S. and Ph.D. degrees from Hokkaido University Sapporo Japan in 1988 1990 and 1993 respectively all in Electronic Engineering. Since 1993 he has been with Niigata University where he is currently a Lecturer. His current research involves superresolution techniques electromagnetic wave measurements and radar signal processings. Dr. Yamada is a member of the IEEE. Received his B.S. degree from Niigata University Niigata Japan in 1994 in Information Engineering. He is currently in the Master's program in Information Engineering. His current research involves superresolution technique and antenna measurements. Received his B.E. degree in Electronics Engineering from Niigata University in 1976 and his M.E. and Dr. of Eng. degrees from Tokyo Institute of Technology Tokyo Japan in 1978 and 1983 respectively. In 1978 he joined the Faculty of Engineering Niigata University where at present he is a Professor. From 1988 to 1989 he was a Research Associate at the University of Illinois at Chicago. His interests are in the field of propagation characteristics of electromagnetic wave in lossy medium radar polarimetry microwave remote sensing and imaging. Dr. Yamaguchi is a senior member of IEEE and a member of the Japan Society for Snow Engineering. Received his B.E. degree in Electrical Engineering from Niigata University Japan in 1967 and his M.E. and Ph.D. degrees from Hokkaido University in 1969 and 1972 respectively. In 1972 he joined the staff at Hokkaido University as a Research Associate. In 1978 he was an Associate Professor at Niigata University where he is presently a Professor. During 1986–1987 he was a Visiting Scholar at the University of California Berkeley and at the University of Illinois Chicago. His research interests include transmission of information network theory and graph theory. He is a recipient of the Best Paper Award of I.E.I.C.E. in 1992. Dr. Sengoku is a senior member of IEE

An application of the superresolution method for the analysis of the electromagnetic scattering data is expected to be effective for experimental verification of the geometrical optics approximation theory and the analysis of multiple paths. There exist many techniques for the superresolution method. It is desirable to select an appropriate technique based upon the characteristics of the individual algorithms. Among these techniques, the Root-MUSIC method has been proposed;this method enables treatment of the signal attenuating exponentially with respect to frequency. In the modified Root-MUSIC method, arbitrary frequency characteristics can be treated. This paper investigates the estimation accuracy of the scattering center and the attenuation coefficient when the Root-MUSIC method and the modified Root-MUSIC method are applied to the estimation of scattering. With the backscattering data of a conducting sphere, the estimation accuracy of the scattering parameters versus the signal-to-noise ratio (SNR) and the number of snapshots is investigated by computer simulation. As a result, it is found that the estimation accuracy of the modified Root-MUSIC method is much better than that of the conventional Root-MUSIC method in the case of a low SNR and a small number of snapshots. Experimental results are also reported.

关键词： super-resolution Root-MUSIC algorithm modified Root-MUSIC algorithm electromagnetic scattering scattering center creeping wave

来源：评论

学校读者我要写书评

暂无评论

Performance of CDMA smart antenna systems

Performance of CDMA smart antenna systems

引用

Asilomar Conference on Signals, Systems & Computers

作者： M. Torlak Guanghan Xu Department of Electrical & Computer Engineering University of Texas Austin Austin TX USA Naval Research under Grant Joint Services Electronics Program Bell Technology Resources Inc. Motorola USA

Preliminary radio frequency (RF) field experiments were conducted to evaluate the performance of smart antenna systems for code-division multiple access (CDMA) systems. Besides conventional multipath fading problems, CDMA schemes are subject to near-far problems. The IS-95 CDMA system uses a 1/3 convolutional encoder and an interleaver to mitigate the fading problem and uses feedback power control schemes to equalize the powers of all the uplink co-channel signals. We evaluate the performance of the IS-95 standard implemented on a smart antenna system in a slow-fading environment. In particular, we evaluate the effects of imprecise power control, convolutional coding, and different beamforming techniques for a CDMA smart antenna system. Our results show that the smart antennas are not so sensitive to imperfect power control and that the optimal (Wiener) beamforming technique outperforms the simple beamforming approach. The most interesting result is that the effect of convolutional coding is not so significant for a smart antenna system than for an single antenna system. Based on our limited experimental results, we found that the 3 times bandwidth dedicated to the 1/3 convolutional encoding is better used to increase the spreading factor in a CDMA smart antenna system, leading to reduced cost and perhaps better performance.

关键词： Multiaccess communication Convolutional codes Convolution Power control Array signal processing Radio frequency Fading Feedback Bandwidth Encoding

来源：评论

学校读者我要写书评

暂无评论

PARALLEL AND DISTRIBUTED TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELD MODELING

引用

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.

关键词： Mathematical models

来源：评论

学校读者我要写书评

暂无评论

EFFECT OF BROADCAST AND PRECISE EPHEMERIDES ON ESTIMATES OF THE FREQUENCY STABILITY OF GPS NAVSTAR CLOCKS

引用

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第5期12卷 435-441页

作者： MCCASKILL, TB REID, WG BUISSON, JA WARREN, HE U.S. Naval Research Laboratory Naval Centre for Space Technology Space Applications Branch Washington DC 20375–5320 USA. A physicist who has worked with the Space Applications Branch of the Naval Research Laboratory (NRL) since 1960. He works in the areas of precise time and frequency and satellite navigation. His satellite navigation work began in 1966 with the TIM-ATION program. He developed navigation algorithms that were used in the design of the NRL-proposed constellation for GPS. He has been a member of the GPS team for more than 20 years. His current work involves the frequency stability analysis of all GPS Navstar and monitor station clocks. An Electronics Engineer who has worked at the Naval Research Laboratory since 1971 and with the Space Applications Branch since 1983. He has been a member of the GPS team for more than a decade. His current work involves software development for the clock analysis program and analysis of the Navstar clock behaviour in the areas of anomaly detection correction of breaks in the data frequency stability and spectral analysis. SFA Inc. 1401 McCormick Drive Landover MD 20785 USA. A physicist who has been associated with the Naval Research Laboratory since 1960 and currently is an independent contractor. He has worked on the GPS project for more than 20 years. He was involved with the first experiment in the TIMATION program in 1964 and with the design of the NRL-proposed constellation for GPS. He was the Director of the Control Center for the Navigation Technology Segment (NTS) of GPS which verified key concepts that included precise time transfer navigation and the relativistic clock effect for GPS. An engineer who has been associated with the Space Applications Branch of the Naval Research Laboratory since 1959–first with Bendix Field Engineering until 1990 and currently with SFA Inc. His work includes GPS precise time and frequency measurements for NTS and GPS data communications and analysis of the Navstar clocks.

Frequency stability analysis of on-orbit Navstar clocks is performed by the Naval Research Laboratory using both the broadcast and the precise post-processed ephemerides. The phase offset between the Navstar clock and the reference clock is computed from pseudorange measurements obtained by dual-frequency GPS receivers at the five GPS monitor sites and at the U.S. Naval Observatory precise-time site. The broadcast ephemerides are generated at the GPS master control station by a Kalman filter using data collected from the five GPS monitor stations. The precise post-processed ephemerides are generated by the Defense Mapping Agency (DMA) using data collected from the GPS monitor sites and from five additional DMA monitor sites. In this paper the frequency stability is estimated for two Navstar caesium clocks-a Block I caesium clock (Navstar 9) and a Block II caesium clock (Navstar 23)-using both the broadcast and the precise ephemerides. A significant improvement in the estimate of the frequency stability of the Block II clocks has been achieved using the precise ephemeris.

关键词： GPS NAVSTAR CLOCKS FREQUENCY STABILITY BROADCAST AND PRECISE EPHEMERIDES EPHEMERIS PREDICTION UNCERTAINTY

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：