检索结果-内蒙古大学图书馆

Synthesis, crystal structure, and magnetism of β-Fe1.00(2)Se1.00(3) single crystals

Physical Review B 2011年第22期83卷 224502-224502页

作者： Rongwei Hu (胡荣伟) Hechang Lei (雷和畅) Milinda Abeykoon Emil S. Bozin Simon J. L. Billinge J. B. Warren Theo Siegrist C. Petrovic Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton New York 11973 USA Department of Applied Physics and Applied Mathematics Columbia University New York New York 10027 USA Instrumentation Division Brookhaven National Laboratory Upton New York 1197 USA Department of Chemical and Biochemical Engineering and National High Magnetic Field Laboratory Florida State University Tallahassee Florida 32310 USA

Understanding iron-based superconductors requires high-quality impurity-free single crystals. So far they have been elusive for β-FeSe and extraction of intrinsic materials properties has been compromised by several magnetic-impurity phases. Here, we report synchrotron-clean β-FeSe superconducting single crystals grown via LiCl/CsCl flux method. Phase purity yields evidence for a defect-induced weak ferromagnetism that coexists with superconductivity below Tc. In contrast to Fe1+yTe-based superconductors, our results reveal that the interstitial Fe(2) site is not occupied and that all contribution to density of states at the Fermi level must come from in-plane Fe(1).

关键词： PHYSICS research SUPERCONDUCTORS IMPURITY distribution in semiconductors SUPERCONDUCTIVITY MAGNETISM CRYSTALS

来源：评论

学校读者我要写书评

暂无评论

Orbital-selective conductance of Co adatom on the Pt(111) surface

引用

Physical Review B 2011年第19期84卷 193407-193407页

作者： V. V. Mazurenko S. N. Iskakov M. V. Valentyuk A. N. Rudenko A. I. Lichtenstein Theoretical Physics and Applied Mathematics Department Ural Federal University Mira Str. 19 620002 Ekaterinburg Russia Institute of Chemical Reaction Engineering Hamburg University of Technology Eissendorfer Str. 38 D-21073 Hamburg Germany Institute of Theoretical Physics University of Hamburg Jungiusstrasse 9 D-20355 Hamburg Germany

We propose an orbital-selective model for the transport and magnetic properties of an individual Co impurity deposited on the Pt(111) surface. Using a combination of an Anderson-type Hamiltonian and Kubo's linear response theory we show that the magnetization and dI/dV spectrum of the Co adatom originate from the 3d states of different symmetry. A textbook expression for the spin-dependent differential conductance provides a natural connection between magnetic and transport properties of Co/Pt(111). We found that it is possible to detect and to manipulate the different 3d states of the Co adatom by tuning the tip-impurity distance in scanning tunneling microscopy experiments.

关键词： MAGNETIC properties COBALT PLUTONIUM HAMILTONIAN systems SYMMETRY (Physics) SCANNING tunneling microscopy

来源：评论

学校读者我要写书评

暂无评论

Combining wireless neural recording and video capture for the analysis of natural gait

Combining wireless neural recording and video capture for th...

引用

International IEEE/EMBS Conference on Neural engineering, CNE

作者： Justin D. Foster Oren Freifeld Paul Nuyujukian Stephen I. Ryu Michael J. Black Krishna V. Shenoy Department of Electrical Engineering University of Stanford Stanford CA USA Division of Applied Mathematics Brown University Providence RI USA Bioengineering and Stanford Medical School University of Stanford Stanford CA USA Department of Neurosurgery Palo Alto Medical Foundation Palo Alto CA USA Department of Computer Science Brown University Providence RI USA Max-Planck Institute Tubingen Germany Departments of Electrical Engineering Bioengineering and Neurobiology and the Neurosciences Program University of Stanford Stanford CA USA

Neural control of movement is typically studied in constrained environments where there is a reduced set of possible behaviors. This constraint may unintentionally limit the applicability of findings to the generalized case of unconstrained behavior. We hypothesize that examining the unconstrained state across multiple behavioral contexts will lead to new insights into the neural control of movement and help advance the design of neural prosthetic decode algorithms. However, to pursue electrophysiological studies in such a manner requires a more flexible framework for experimentation. We propose that head-mounted neural recording systems with wireless data transmission, combined with markerless computer-vision based motion tracking, will enable new, less constrained experiments. As a proof-of-concept, we recorded and wirelessly transmitted broadband neural data from 32 electrodes in premotor cortex while acquiring single-camera video of a rhesus macaque walking on a treadmill. We demonstrate the ability to extract behavioral kinematics using an automated computer vision algorithm without use of markers and to predict kinematics from the neural data. Together these advances suggest that a new class of “freely moving monkey” experiments should be possible and should help broaden our understanding of the neural control of movement.

关键词： Animals Kinematics Decoding Neuroscience Synchronization Image segmentation Wireless communication

来源：评论

学校读者我要写书评

暂无评论

K, T and D-like fuzzy Kripke models

K, T and D-like fuzzy Kripke models

引用

Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： Benjamin Bedregal Regivan H. N. Santiago Mario Benevides Petrúcio Viana Group of Logic Language Information Theory and Applications-LoLITA Department of Informatics and Applied Mathematics Federal University of Rio Grande do Norte Natal Rio Grande do Norte Brazil Program of Engineering of Systems and Computing-PESC Department of Computer Science Federal University of Rio de Janeiro Rio de Janeiro Rio de Janeiro Brazil Department of Analysis Fluminense Federal University (UFF) Niteroi Rio de Janeiro Brazil

The idea of a Kripke semantics endowed with possibility/plausibility information is not new; in fact there are different approaches for that; see: [6], [13], [16], [19]. This paper follows the approach found in [6], but whereas [6] provides a fixed interpretation for connectives into [0,1] here we provide a characterization of a fuzzy semantics for connectives in such a way that the resulting fuzzy frames: K, T and D, are described precisely by the set of statements which also describes, respectively, the usual modal systems K, T and D.

关键词： Semantics Fuzzy sets Fuzzy logic Bismuth Electronic mail Uncertainty Reliability

来源：评论

学校读者我要写书评

暂无评论

Metabolic flux and nutrient uptake modeling of normal and apoptotic CHO cells

引用

IFAC Proceedings Volumes 2010年第6期43卷 395-400页

作者： Saeideh Naderi Mukesh Meshram Catherine Wei Brendan McConkey Brian Ingalls Hector Budman Jeno Scharer Department of Chemical Engineering Department of Biology Department of Applied Mathematics

Applying metabolic flux analysis as the basis, a dynamic mathematical model was developed for describing the growth and metabolic behavior of CHO cells producing monoclonal antibodies (MAb) in batch culture. The viable cell population was assumed to consist of normal growing, normal non-growing and apoptotic cell subpopulations. A logistic cell growth model was derived that differentiates between actively dividing, resting, and apoptotic cells. The rate of apoptotic cell formation was assumed to have a second order dependence on the normal cell concentration. The proposed mathematical model for metabolites included distinct terms that reflected the metabolic rates of growing and non-growing cell populations. The results of the prediction were in good agreement with experimental data for different initial conditions.

关键词： CHO MAb Metabolic Flux Analysis Apoptosis Mathematical Modeling

来源：评论

学校读者我要写书评

暂无评论

Recovery of frequency-sparse signals from compressive measurements

Recovery of frequency-sparse signals from compressive measur...

引用

48th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2010

作者： Duarte, Marco F. Baraniuk, Richard G. Program in Applied and Computational Mathematics Princeton University United States Department of Electrical and Computer Engineering Rice University United States

ISBN: (纸本)9781424482146

Compressive sensing (CS) is a new approach to simultaneous sensing and compression for sparse and compressible signals. While the discrete Fourier transform has been widely used for CS of frequency-sparse signals, it provides optimal sparse representations only for signals with components at integral frequencies. There exist redundant frames that provide compressible representations for frequency-sparse signals, but such frames are highly coherent and severely affect the performance of standard CS recovery. In this paper, we show that by modifying standard CS recovery algorithms to prevent coherent frame elements from being present in the signal estimate, it is possible to bypass the shortcomings introduced by the coherent frame. The resulting algorithm comes with theoretical guarantees and is shown to perform significantly better for frequency-sparse signal recovery than its standard counterparts. The algorithm can also be extended to similar settings that use coherent frames. ©2010 IEEE.

关键词： Compressed sensing

来源：评论

学校读者我要写书评

暂无评论

On the mechanism of nucleation in pulsed-laser quenched Si films on Si02

引用

作者： Deng, Y. Hu, Q. Chung, U.J. Chitu, A.M. Limanov, A.B. Im, James S. Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 United States

ISBN: (纸本)9781605112220

We have investigated the solid nucleation mechanism in laser-quenched Si films on SiO2. Previously neglected experimental steps, consisting of BHF-etching and irradiation in vacuum, were implemented to reduce potential extrinsic influences. The resulting experimental findings and computational analysis lead us to conclude that solid nucleation consistently takes place heterogeneously at, and only at, the bottom liquid Si-SiO2 interface. © 2010 Materials Research Society.

关键词： Nucleation

来源：评论

学校读者我要写书评

暂无评论

A boost for the emerging field of RNA nanotechnology report on the First International Conference on RNA nanotechnology

A boost for the emerging field of RNA nanotechnology report ...

引用

作者： Shukla, Girish C. Haque, Farzin Tor, Yitzhak Wilhelmsson, L. Marcus Toulmé, Jean-Jacques Isambert, Hervé Guo, Peixuan Rossi, John J. Tenenbaum, Scott A. Shapiro, Bruce A. Center for Gene Regulation in Health and Disease Department of Biological Sciences Cleveland State University Cleveland OH 44115 United States Nanobiomedical Center College of Engineering and Applied Science University of Cincinnati Cincinnati OH 45267 United States Department of Chemistry and Biochemistry University of California San Diego San Diego CA 92093 United States Department of Chemical and Biological Engineering/Physical Chemistry Chalmers University of Technology Kemivägen 10 SE-412 96 Göteborg Sweden Universite Bordeaux Segalen INSERM U869 Bâtiment 3A 1er étage 33076 Bordeaux Cedex France Institut Curie Research Division CNRS UMR168 11 rue P. and M. Curie 75005 Paris France Department of Molecular and Cellular Biology Beckman Research Institute of City of Hope Duarte CA 91010 United States College of Nanoscale Science and Engineering University at Albany-SUNY Albany NY 12203 United States Center for Cancer Research Nanobiology Program National Cancer Institute at Frederick Frederick MD 21702 United States

This Nano Focus article highlights recent advances in RNA nanotechnology as presented at the First International Conference of RNA Nanotechnology and Therapeutics, which took place in Cleveland, OH, USA (October 23-25, 2010) (http://***/nanomedicine/RNA2010/), chaired by Peixuan Guo and co-chaired by David Rueda and Scott Tenenbaum. The conference was the first of its kind to bring together more than 30 invited speakers in the frontier of RNA nanotechnology from France, Sweden, South Korea, China, and throughout the United States to discuss RNA nanotechnology and its applications. It provided a platform for researchers from academia, government, and the pharmaceutical industry to share existing knowledge, vision, technology, and challenges in the field and promoted collaborations among researchers interested in advancing this emerging scientific discipline. The meeting covered a range of topics, including biophysical and single-molecule approaches for characterization of RNA nanostructures;structure studies on RNA nanoparticles by chemical or biochemical approaches, computation, prediction, and modeling of RNA nanoparticle structures;methods for the assembly of RNA nanoparticles;chemistry for RNA synthesis, conjugation, and labeling;and application of RNA nanoparticles in therapeutics. A special invited talk on the well-established principles of DNA nanotechnology was arranged to provide models for RNA nanotechnology. An Administrator from National Institutes of Health (NIH) National Cancer Institute (NCI) Alliance for Nanotechnology in Cancer discussed the current nanocancer research directions and future funding opportunities at NCI. As indicated by the feedback received from the invited speakers and the meeting participants, this meeting was extremely successful, exciting, and informative, covering many groundbreaking findings, pioneering ideas, and novel discoveries. © 2011 American chemical Society.

关键词： RNA

来源：评论

学校读者我要写书评

暂无评论

A new formulation of fault-tolerant estimation problems and some solutions

A new formulation of fault-tolerant estimation problems and ...

引用

2010 IEEE 26th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2010

作者： Sigalov, Daniel Oshman, Yaakov Interdepartmental Program for Applied Mathematics Technion Israel Institute of Technology Israel Department of Aerospace Engineering Technion Israel Institute of Technology Israel

ISBN: (纸本)9781424486809

The problem of fault tolerant state estimation is considered. We propose a unified, general formulation of the problem in which two different types of faults affect the system's output simultaneously. This problem statement generalizes previously reported formulations that may be obtained as special cases. Three families of state estimation methods for fault-prone systems are presented, generalizing several classical estimation algorithms. These families include: one-step nearoptimal filters, which are closely related to the GPB filter family, IMM-based filters, and linear optimal estimators. © 2010 IEEE.

关键词： State estimation

来源：评论

学校读者我要写书评

暂无评论

Metabolic flux and nutrient uptake modeling of normal and apoptotic CHO cells

Metabolic flux and nutrient uptake modeling of normal and ap...

引用

作者： Naderi, Saeideh Meshram, Mukesh Wei, Catherine McConkey, Brendan Ingalls, Brian Budman, Hector Scharer, Jeno Department of Chemical Engineering University of Waterloo Waterloo ON Canada Department of Biology University of Waterloo Waterloo ON Canada Department of Applied Mathematics University of Waterloo Waterloo ON Canada

ISBN: (纸本)9783902661708

关键词： Cell death

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：