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Origin of ferromagnetism in Zn1−xCoxO from magnetization and spin-dependent magnetoresistance measurements

Physical Review B 2007年第15期76卷 155312-155312页

作者： T. Dietl T. Andrearczyk A. Lipińska M. Kiecana Maureen Tay Yihong Wu Institute of Physics Polish Academy of Science Aleja Lotników 32/46 PL 02-668 Warszawa Poland Institute of Theoretical Physics Warsaw University PL 00-681 Warszawa Poland ERATO Semiconductor Spintronics Project Japan Science and Technology Agency Aleja Lotników 32/46 PL 02-668 Warszawa Poland Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117576 Singapore Data Storage Institute 5 Engineering Drive 1 Singapore 117608 Singapore

In order to elucidate the nature of ferromagnetic signatures observed in (Zn,Co)O, we have examined experimentally and theoretically magnetic properties and spin-dependent quantum localization effects that control low-temperature magnetoresistance. Our findings, together with a through structural characterization, substantiate the model assigning spontaneous magnetization of (Zn,Co)O to uncompensated spins at the surface of antiferromagnetic nanocrystal of Co-rich wurtzite (Zn,Co)O. The model explains a large anisotropy observed in both magnetization and magnetoresistance in terms of spin Hamiltonian of Co ions in the crystal field of the wurtzite lattice.

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Special Issue on Variable Structure System Control — New Designs and Applications

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Asian Journal of Control 2008年第4期5卷

作者： Prof. Jian-Xin Xu Prof. Leonid Fridman Department of Electrical and Computer Eng. National University of Singapore 4 Engineering Drive 3 Singapore 117576 Tel +65 6874-2566 Fax +65 6779-1103 Dr Jian-Xin Xu received his Bachelor degree from Zhejiang University China in 1982. He attended the University of Tokyo Japan where he received his Master's and Ph.D. degrees in 1986 and 1989 respectively. All his degrees are in Electrical Engineering. He worked for one year in the Hitachi research Laboratory Japan and for more than one year in Ohio State University U.S.A. as a Visiting Scholar. In 1991 he joined the National University of Singapore and is currently an associate professor in the Department of Electrical Engineering. His research interests lie in the fields of learning control variable structure control fuzzy logic control discontinuous signal processing and applications to motion control and process control problems. He is the associate editor of Asian Journal of Control member of TC on variable structure systems and sliding mode control of IEEE Control Systems Society and a senior member of IEEE. He has produced more than 90 peer-refereed journal papers near 160 technical papers in conference proceedings and authored/edited 4 books. Division de Estudios de Posgrado Facultad de Ingenieria National Autonomous University of Mexico DEP-FI UNAM Edificio “A” Circuito Exterior Ciudad Universitaria A. P. 70–256 C.P.04510 Mexico D.F. Mexico Tel +52 55 56223014 Fax +52 55 56161719 Dr. Leonid M. Fridman received his M.S in mathematics from Kuibyshev (Samara) State University Russia Ph.D. in Applied Mathematics from Institute of Control Science (Moscow) and Dr. of Science degrees in Control Science from Moscow State University of Mathematics and Electronics in 1976 1988 and 1998 respectively. In 1976–1999 Dr. Fridman was with the Department of Mathematics at the Samara State Architecture and Civil Engineering Academy Samara Russia. In 2000–2002 he was with the Department of Postgraduate Study and Investigations at the Chihuahu

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Silicon-germanium saturable absorber mirrors for ultra-short pulse generation

Silicon-germanium saturable absorber mirrors for ultra-short...

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SiGe and Ge: Materials, processing, and Devices - 210th Electrochemical Society Meeting

作者： Kärtner, F.X. Byun, H. Grawert, F.J. Gopinath, J.T. Shen, H.M. Ippen, E.P. Akiyama, S. Liu, J. Wada, K. Kimerling, L.C. Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States Materials Processing Center Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 United States

ISBN: (纸本)1566775078

Silicon-Germanium saturable absorber mirrors are developed for laser mode locking. The fabrication process is fashioned such that a highly reflecting Si/SiO2 Bragg mirror with a crystalline absorber top-layer is generated. One step of wafer-bonding allows for subsequent epitaxial growth on the mirror. A six-pair reflector centered at 1400 nm with 99.8% peak reflectivity, a 99%-reflectivity bandwidth of 700 nm and a surface roughness of 0.136 nm is demonstrated. A thin Germanium layer is epitaxially deposited on the mirror surface to provide saturable absorption at 1550nm. with a sub-picosecond recovery time. The device is used to achieve stable, continuously modelocked operation of an Er-Yb:glass laser centered at 1540 nm, generating 220 fs pulses. Copyright The Electrochemical Society.

关键词： Mirrors

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Discrete sibson interpolation

Discrete sibson interpolation

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作者： Park, Sung W. Linsen, Lars Kreylos, Oliver Owens, John D. Hamann, Bernd IEEE Department of Computer Science University of California Davis CA 95616 Department of Mathematics and Computer Science Ernst-Maritz-Arndt-Universität Greifswald D-17487 Greifswald Germany University of California Davis Department of Mathematics and Computer Science Emst-Moritz-Amdt-Universität Greifswald Germany Department of Electrical and Computer Engineering University of California Davis Davis Institute of Data Analysis and Visualization University of California Davis Department of Computer Science

Natural neighbor interpolation methods, such as Sibson's method, are well-known schemes for multivariate data fitting and reconstruction. Despite its many desirable properties, Sibson's method is computationally expensive and difficult to implement, especially when applied to higher-dimensional data. The main reason for both problems is the method's implementation based on a Voronol diagram of all data points. We describe a discrete approach to evaluating Sibson's interpolant on a regular grid, based solely on finding nearest neighbors and rendering and blending d-dimensional spheres. Our approach does not require us to construct an explicit Voronoi diagram, is easily implemented using commodity three-dimensional graphics hardware, leads to a significant speed increase compared to traditional approaches, and generalizes easily to higher dimensions. For large scattered data sets, we achieve two dimensional (2D) interpolation at interactive rates and 3D interpolation (3D) with computation times of a few seconds. © 2006 IEEE.

关键词： Interpolation

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Coherent concurrent tasks scheduling and resources assignment in dependable computer systems design

Coherent concurrent tasks scheduling and resources assignmen...

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作者： Drabowski, Mieczyslaw Wantuch, Edward Department of Computer Engineering Cracow University of Technology Warszawska 24 Krakow 31-155 Poland Institute of Computing Science Cracow University of Technology Jana Pawla II 37 Krakow 31-864 Poland Department of Computer Engineering Faculty of Electrical and Computer Engineering Cracow University of Technology Polish Information Processing Society IT Technologies Department Institute of Computing Sciences Polish Academy of Engineers Polish Academy of Art and Sciences Technical Sciences Commission

The paper includes a proposal of a new model of coherent concurrent tasks scheduling and a of resources assignment, that are characteristic for the problem of dependable system synthesis. Optimal tasks scheduling, partition at resources, allocation tasks and resources are basic problems in high-level synthesis of computer systems. Coherent synthesis may have a practical application in developing tools for computer aided rapid prototyping of such systems. © World Scientific Publishing Company.

关键词： computer aided software engineering

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Automatic Model-Order Selection for PCA

Automatic Model-Order Selection for PCA

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IEEE International Conference on Image processing

作者： Michel Sarkis Zaher Dawy Florian Obermeier Klaus Diepold Institute for Data Processing LDV Munich University of Technology Munich Germany Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon

Determining the model-order of a given data set is an important task in signal analysis. Principal component analysis (PCA) can be used for this purpose if there is a criterion upon which the correct order can be chosen. In this work, we propose a new and simple technique to determine automatically the rank of a PCA model. Tested with simulated data, the algorithm is able to determine the correct model order efficiently. Applied to video sequences, this method is able to estimate the necessary subspaces that capture the motion and illuminance changes within the different frames. This helps in reducing the storage need/requirements of video sequences and improves the efficiency of context based search and retrieval techniques.

关键词： Principal component analysis Video sequences Covariance matrix Signal processing algorithms Testing Signal processing Independent component analysis Matrix decomposition data processing Signal analysis

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Development of a GMPLS-capable WDM optical network testbed and distributed storage application

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IEEE Communications Magazine 2006年第2期44卷 23-29页

作者： Zhou, Luying Chai, Teck Yoong Saradhi, Chava Vijaya Wang, Yixin Foo, Victor Qiang, Qiu Biswas, Jit Lu, Chao Gurusamy, Mohan Cheng, Tee Hiang Wang, Yonghong Institute for Infocomm Research Agency for Science Technology and Research Singapore Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore Communication Engineering Division School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore Data Storage Institute Agency for Science Technology and Research Singapore Singapore

In this article we present the details of a generalized multiprotocols label witching controlled wavelength-division multiplexing (WDM) optical network developed under the Optical Network Focused Interest Group (ONFIG) program in Singapore. The WDM network is controlled through a GMPLS control plane that consists of CR-LDP, LMP, and OSPF-TE. We conducted various field trials on the GMPLS-capable WDM optical network testbed with the main focus on distributed storage service application. We developed and evaluated a distributed storage services application on the WDM optical network testbed and demonstrated that incorporating a lightweight data transport protocol with optical network control could be an efficient approach for data-intensive storage applications by exploiting the dynamic connection establishment and backup protection features. © 2006 IEEE.

关键词： Telecommunication networks

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Disorder induced bands in first order Raman spectra of carbon nanowalls

Disorder induced bands in first order Raman spectra of carbo...

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2006 6th IEEE Conference on Nanotechnology, IEEE-NANO 2006

作者： Wang, Haomin Wu, Yihong Choong, Catherine Kai Shin Zhang, Jun Teo, Kie Leong Ni, Zhenhua Shen, Zexiang Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117576 Singapore Data Storage Institute 5 Engineering Drive 1 Singapore 117608 Singapore Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 1 Nanyang Walk Block 5 Singapore 637616 Singapore

ISBN: (纸本)1424400783

Raman spectra of carbon nanowalls grown by microwave plasma enhanced chemical vapor deposition were analyzed. A typical Raman spectrum of carbon nanowalls exhibits three main bands, i.e., the G, D and D' bands centered at about 1580, 1350 and 1620 cm-1, respectively. The peak intensity ratio of D to G band (ID/IG) was found to be strongly influenced by edge length density of carbon nanowalls, suggesting that the strong D band is originated from the defects at the edges. The addition of water during the growth process increased the defects formed by water assisted oxidization which in turn, resulted in the increase of the D band's relative intensity. © 2006 IEEE.

关键词： Walls (structural partitions)

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A Toolbox for Brain Emotional Learning Based Intelligent Controller

A Toolbox for Brain Emotional Learning Based Intelligent Con...

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IEEE International Conference on engineering of Intelligent Systems, ICEIS

作者： A.R. Mehrabian C. Lucas Control and Intelligent Processing Center of Excellence Department of Mechanical Engineering University of Tehran Tehran Iran School of Cognitive Science Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

Brain emotional learning based intelligent controller, BELBIC, has been used for model free adaptive control of several complex industrial plants. It has proven to be very effective controller with light computational load. The aim of this research is to present a general purpose toolbox implementing BELBIC as well as examples of its performance. The user can choose to utilize default configurations or to customize specific configuration to the given plant

关键词： Nonlinear control systems Intelligent control Intelligent structures Control system synthesis Control systems Brain modeling Process control Power system control Power system dynamics Mechanical engineering

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Semantics, Web and Mining: Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2006年 4289 LNAI卷 v-vi页

作者： Berendt, Bettina Hotho, Andreas Mladenič, Dunja Semeraro, Giovanni Spiliopoulou, Myra Stumme, Gerd Van Someren, Maarten Ackermann, Markus Grobelnik, Marko Svátek, Vojtěch Institute of Information Systems Humboldt University Berlin Germany Knowledge and Data Engineering Group University of Kassel Germany J. Stefan Institute Ljubljana Slovenia Department of Informatics University of Bari Italy Faculty of Computer Science Otto-von-Guericke-Univ. Magdeburg Germany Informatics Institute University of Amsterdam Netherlands Dept. of Natural Language Processing Institute for Computer Science University of Leipzig Germany University of Economics Prague Czech Republic

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