检索结果-内蒙古大学图书馆

Study of Xbmeson production in pp collisions at √s=7 and 8 TeV and observation of the decay Xb(3P) → ϒ (3S) γ

European Physical Journal C 2014年第10期74卷 1-13页

作者： Aaij, R. Adeva, B. Adinolfi, M. Affolder, A. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Anderson, J. Andreassen, R. Andreotti, M. Andrews, J.E. Appleby, R.B. Aquines Gutierrez, O. Archilli, F. Artamonov, A. Artuso, M. Aslanides, E. Auriemma, G. Baalouch, M. Bachmann, S. Back, J.J. Badalov, A. Baldini, W. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Batozskaya, V. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Belogurov, S. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Benton, J. Berezhnoy, A. Bernet, R. Bettler, M.-O. van Beuzekom, M. Bien, A. Bifani, S. Bird, T. Bizzeti, A. Bjørnstad, P.M. Blake, T. Blanc, F. Blouw, J. Blusk, S. Bocci, V. Bondar, A. Bondar, N. Bonivento, W. Borghi, S. Borgia, A. Borsato, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Brambach, T. van den Brand, J. Bressieux, J. Brett, D. Britsch, M. Britton, T. Brodzicka, J. Brook, N.H. Brown, H. Bursche, A. Busetto, G. Buytaert, J. Cadeddu, S. Calabrese, R. Calvi, M. Calvo Gomez, M. Campana, P. Campora Perez, D. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Castillo Garcia, L. Cattaneo, M. Cauet, Ch. Cenci, R. Charles, M. Charpentier, Ph. Chefdeville, M. Chen, S. Cheung, S.-F. Chiapolini, N. Chrzaszcz, M. Ciba, K. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombes, M. Coquereau, S. Corti, G. Corvo, M. Counts, I. Couturier, B. Cowan, G.A. Craik, D.C. Cruz Torres, M. Cunliffe, S. Currie, R. D’Ambrosio, C. Dalseno, J. David, P. David, P.N.Y. Davis, A. De Bruyn, K. De Capua, S. De Cian, M. De Miranda, J.M. De Paula, L. De Silva, W. De Simone, P. Decamp, D. Deckenhoff, M. Del Buono, L. Déléage, N. Derkach, D. Deschamps, O. Dettori, F. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China LAPP Université de Savoie CNRS/IN2P3 Annecy-Le-Vieux France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France LAL Université Paris-Sud CNRS/IN2P3 Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Sezione INFN di Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell’INFN di Frascati Frascati Italy Sezione INFN di Genova Genoa Italy Sezione INFN di Milano Bicocca Milan Italy Sezione INFN di Milano Milan Italy Sezione INFN di Padova Padua Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Rome Italy Sezione INFN di Roma La Sapienza Rome Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland Faculty of Physics and Applied Computer Science AGH-University of Science and Technology Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Novosibirsk Russia Novosibirsk State University Novosibirsk Russia Protvino Russia Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zurich Switzerland Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Su

A study of meson production at LHCb is performed on proton–proton collision data, corresponding to 3.0 of integrated luminosity collected at centre-of-mass energies = 7 and 8. The fraction of Υ mesons originating from χ decays is measured as a function of the transverse momentum in the rapidity range. The radiative transition of the meson to Υ is observed for the first time. The χ mass is determined to be (Formula presented.) where the first uncertainty is statistical and the second is systematic. © 2014, CERN for the benefit of the LHCb collaboration.

关键词： Bosons

来源：评论

学校读者我要写书评

暂无评论

Time Synchronization in the DHT-based P2P Network Kad for Real-Time Automation Scenarios

Time Synchronization in the DHT-based P2P Network Kad for Re...

引用

IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks

作者： Jan Skodzik Peter Danielis Vlado Altmann Dirk Timmermann University of Rostock Institute of Applied Microelectronics and Computer Engineering 18051 Rostock Germany Tel./Fax: +49 381 498-7284 / -1187251

ISBN: (纸本)9781467358279

In this paper, an approach to synchronize the P2P network Kad to be applied in automation scenarios is presented. The approach bases on a deterministic algorithm to synchronize the network, which is required for hard real-time applications. Todays Industrial Ethernet solutions include and support machine to machine communication in automation scenarios. However, instead of allowing direct communication, the communication relies on centralized structures, which are deficient in resilience and scalability However, instead of allowing direct communication, the communication relies on centralized structures. The presented decentralized approach benefits from nodes helping to synchronize the network. However, the higher the number of helping nodes the higher is the time deviation on the nodes of the network, which contrary results in a higher time error. Therefore, a trade-off between synchronization performance and time error has to be determined to meet predefined constraints depending on the application scenario. Moreover, the individual clock drift of every device is considered to define necessary re-synchronization intervals of the network. Additionally, the optimum number of nodes to synchronize the Kad based network has been identified and the resulting synchronization performance and generated traffic are determined. Furthermore, an approach is presented to handle the dynamic churn of nodes.

关键词： Peer-to-Peer Kad Synchronization Automation

来源：评论

学校读者我要写书评

暂无评论

Ultrawideband Dispersion Control of a Metamaterial Surface for Perfectly-Matched-Layer-Like Absorption

引用

Physical Review Letters 2013年第18期111卷 187402-187402页

作者： Dexin Ye Zhiyu Wang Kuiwen Xu Huan Li Jiangtao Huangfu Zheng Wang Lixin Ran Laboratory of Applied Research on Electromagnetics (ARE) Zhejiang University Hangzhou 310027 China Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Electrical and Computer Engineering Microelectronics Research Center the University of Texas at Austin Texas 78758 USA

Narrow bandwidth is a fundamental issue plaguing practical applications of metamaterial absorbers. In this Letter, we show that by deliberately controlling the dispersion and dissipation of a metamaterial, an ultrawideband perfect metamaterial absorber with complex-valued constitutive parameters strictly satisfying the modified model of a perfectly matched layer, can be achieved. The nearly perfect power absorption, better than 99%, was experimentally observed in an unprecedented bandwidth of 39%, approaching the theoretical Rozanov limit. We expect a wide range of applications to emerge from this general concept.

关键词： LIGHT propagation ENERGY dissipation BANDWIDTHS ULTRA-wideband radar DIGITAL communications

来源：评论

学校读者我要写书评

暂无评论

Classification of user positioning techniques and systems for intelligent environments 42

Classification of user positioning techniques and systems fo...

引用

42. Jahrestagung der Gesellschaft fur Informatik e.V. ,GI, Informatik 2012 - 42nd Annual Meeting of the German Informatics Society (GI), Informatics 2012

作者： Wagner, Benjamin Timmermann, Dirk Institute of Applied Microelectronics and Computer Engineering University of Rostock Richard-Wagner-Straße 31 Rostock-Warnemünde18119 Germany

ISBN: (纸本)9783885796022

One of the most important observation parameters for smart environments and ambient intelligence is the position of users. Over the last years huge research efforts have been spent on new algorithms, technologies, and systems for the localization of users and objects. The spread of these technologies results in a wide range of application scenarios and manifold combinations of measurements and algorithms. One fundamental task in designing smart environments is the choice of a localization system which fits into the ambient infrastructure, is applicable to the underlying application scenario, and provides localization results in desired form and accuracy. At this stage, it is very difficult to compare the published systems in order to opt for a specific solution. In this work existing systems and techniques are evaluated and documented under different characteristics facing two goals. The first one is to give an overview about the state of the art of user localization techniques and secondly to make these techniques comparable in order to fit the right technique to a given application. Therefore, intrinsic system characteristics are documented. © 2012 Gesellschaft fur Informatik (GI). All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Passive RFID tomographic imaging for device-free user localization

Passive RFID tomographic imaging for device-free user locali...

引用

2012 9th Workshop on Positioning, Navigation and Communication, WPNC'12

作者： Wagner, Benjamin Patwari, Neal Timmermann, Dirk Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany SPAN Lab. Department of Electrical and Computer Engineering University of Utah Salt Lake City UT United States

ISBN: (纸本)9781467314398

Localization of users is an important part of location aware systems and smart environments. It forms a major data source for superimposed intention recognition systems. In RF device-free localization (DFL), the person being tracked does not need to wear a RF transmitter or receiver in order to be located. Instead, they are tracked using the changes in signal strength measured on static links in a wireless network. This work presents a new algorithm for RF DFL using passive RFID networks. We formulate and show how a tomographic imaging algorithm provides both low computational complexity and highly accurate position estimates. Using measurements conducted in an indoor environment with various human positions, we find the algorithm can locate the human with as low as 30 cm mean location error. © 2012 IEEE.

关键词： Radio frequency identification (RFID)

来源：评论

学校读者我要写书评

暂无评论

Time Coding Output Neurons in Digital Artificial Neural Networks

Time Coding Output Neurons in Digital Artificial Neural Netw...

引用

International Joint Conference on Neural Networks

作者： Ralf Joost Ralf Salomon Institute of Applied Microelectronics and Computer Engineering University of Rostock

ISBN: (纸本)9781467314886

Previous research has proposed several platforms for the direct hardware implementation of neural networks. Most of these platforms employ a small number of special-purpose processors that emulate a given number of neurons. By contrast, this paper proposes a light-weight hardware model, called time coded output (TiCO) neuron, which codes its internal activation as the duration of its output pulses. Since the implementation of such a neuron requires only about 200 logical elements, standard state-of-the-art field-programmable gate arrays may host several hundreds of neurons on a single chip. Due to its output coding and its low footprint, TiCO neurons are particularly suited for the usage in embedded systems.

关键词： Neuron design Hardware implementation FPGA Pulse width modulation Neurons output pulse Platform Embedded systems Artificial neural networks Logical elements Neural network hardware model Output Field programmable gate arrays

来源：评论

学校读者我要写书评

暂无评论

A Web Service-based Communication Architecture for Smartphone/WPAN Sensor Ensembles

A Web Service-based Communication Architecture for Smartphon...

引用

institute of Electrical and Electronics Engineers International Conference on Emerging Technologies & Factory Automation

作者： Nico Laum Christian Lerche Frank Golatowski Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock

ISBN: (纸本)9781467347358

There are many applications that use low power wireless sensors to monitor people's vital signs or the environment around people, For mobile applications, smartphones with Internet access have become a commonly used tool to make this data remotely accessible. However, the yet presented architectures are quite complex and lack flexibility. Our aim was to investigate how existing communication architectures for smartphone/WPAN sensor ensembles can be simplified and to provide a transparent solution where the smartphone doesn't require knowledge about sensors for which it serves as an Internet gateway. We therefore present an IP-based communication architecture, that allows applications to easily integrate remote sensor data of mobile users based on existing Internet standards. In particular, our solution provides simple Web service-based APIs and does not require the smartphone to process sensor data. Instead, the smartphone becomes a transparent gateway as it only forwards DP packets.

关键词： Web services IPv6 IEEE 802.15.4 Bluetooth Low Energy 6L0WPAN CoAP Internet of Things

来源：评论

学校读者我要写书评

暂无评论

Dethroning Transport Layer Security in the Embedded World

Dethroning Transport Layer Security in the Embedded World

引用

New Technologies, Mobility and Security (NTMS)

作者： Sebastian Unger Stefan Pfeiffer Dirk Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

Developing a security concept feasible for a large number of cooperating embedded devices is crucial for the practical relevance of visions such as the Internet of Things, Ambient Assisted Living or Pervasive Computing. However, designing these concepts in conjunction with new technologies usually is more expensive. Thus, new technologies often rely on existing security techniques on lower layers of the network stack. Especially the Transport Layer Security (TLS) protocol suite is a very popular solution because TLS is a widely spread and well accepted protocol. However, TLS is not ideal for the realm of embedded devices and it does not provide all the necessary features. We state that a comprehensive security framework for large distributed systems of embedded devices has to be implemented on application level. We investigate on the applicability and adaptability of the Web Service (WS) Security specification suite since it offers such a desired comprehensive security framework. Furthermore, its base technology - Web Services - has already been ported to the domain of embedded devices by means of the Devices Profile for Web Services (DPWS). However, WS Security imposes a dramatic overhead on message sizes and parsing efforts for providing confidentiality, integrity and authenticity. Thus, in this paper we discuss two variants of WS Security that decrease the imposed overhead but remain compatible to the classical WS Security. A performance analysis shows that our proposed solutions have no significant drawback compared to the state of the art - TLS - but even provide a richer feature set.

关键词： Payloads Simple object access protocol Protocols Encryption

来源：评论

学校读者我要写书评

暂无评论

Secure information flow awareness for smart wireless eHealth systems

Secure information flow awareness for smart wireless eHealth...

引用

IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Stefan Pfeiffer Sebastian Unger Dirk Timmermann Andreas Lehmann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany Institute of Computer Science University of Rostock Germany

ISBN: (纸本)9781467315906

Usually, safety and robustness are considered as the most important issues when designing and developing smart and wireless eHealth systems for ambient support of patients and physicians. However, information security is an indispensable design criterion due to the sensitive and critical nature of aggregated information from eHealth applications. Therefore, preventing undesired information leaks and illegal information flows is crucial for designing smart mHealth and mobile medical assistant systems. Due to the rapidly increasing complexity of these systems, finding information flow violations manually is nearly impossible. That is why there is a need for formally-based and tool supported verification methods of security properties.

关键词： Security Unified modeling language Medical services Databases Mobile handsets Semantics Mathematical model

来源：评论

学校读者我要写书评

暂无评论

Measurement of CP Violation in the Phase Space of B±→K+K−π± and B±→π+π−π± Decays

引用

Physical Review Letters 2014年第1期112卷 011801-011801页

作者： R. Aaij B. Adeva M. Adinolfi C. Adrover A. Affolder Z. Ajaltouni J. Albrecht F. Alessio M. Alexander S. Ali G. Alkhazov P. Alvarez Cartelle A. A. Alves Jr. S. Amato S. Amerio Y. Amhis L. Anderlini J. Anderson R. Andreassen J. E. Andrews R. B. Appleby O. Aquines Gutierrez F. Archilli A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch S. Bachmann J. J. Back A. Badalov C. Baesso V. Balagura W. Baldini R. J. Barlow C. Barschel S. Barsuk W. Barter Th. Bauer A. Bay J. Beddow F. Bedeschi I. Bediaga S. Belogurov K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson J. Benton A. Berezhnoy R. Bernet M.-O. Bettler M. van Beuzekom A. Bien S. Bifani T. Bird A. Bizzeti P.M. Bjørnstad T. Blake F. Blanc J. Blouw S. Blusk V. Bocci A. Bondar N. Bondar W. Bonivento S. Borghi A. Borgia T. J. V. Bowcock E. Bowen C. Bozzi T. Brambach J. van den Brand J. Bressieux D. Brett M. Britsch T. Britton N. H. Brook H. Brown A. Bursche G. Busetto J. Buytaert S. Cadeddu O. Callot M. Calvi M. Calvo Gomez A. Camboni P. Campana D. Campora Perez A. Carbone G. Carboni R. Cardinale A. Cardini H. Carranza-Mejia L. Carson K. Carvalho Akiba G. Casse L. Castillo Garcia M. Cattaneo Ch. Cauet R. Cenci M. Charles Ph. Charpentier S.-F. Cheung N. Chiapolini M. Chrzaszcz K. Ciba X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier C. Coca V. Coco J. Cogan E. Cogneras P. Collins A. Comerma-Montells A. Contu A. Cook M. Coombes S. Coquereau G. Corti B. Couturier G. A. Cowan D. C. Craik M. Cruz Torres S. Cunliffe R. Currie C. D’Ambrosio P. David P. N. Y. David A. Davis I. De Bonis K. De Bruyn S. De Capua M. De Cian J. M. De Miranda L. De Paula W. De Silva P. De Simone D. Decamp M. Deckenhoff L. Del Buono N. Déléage D. Derkach O. Deschamps F. Dettori A. Di Canto H. Dijkstra M. Dogaru S. Donleavy F. Dordei A. Dosil Suárez D. Dossett A. Dovbnya F. Dupertuis P. Durante R. Dzhelyadin A. Dziurda A. Dzyuba S. Easo U. Egede V. Egorychev S. Eidelman D. van Eijk S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund I. El Rifai Ch. Elsasser A. Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Universidad de Santiago de Compostela Santiago de Compostela Spain H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Redfsearch (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Petersburg Nuclear Physics Institute (PNPI) Gatchina Russia Sezione INFN di Roma La Sapienza Roma Italy Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Sezione INFN di Padova Padova Italy LAL Université Paris-Sud CNRS/IN2P3 Orsay France Sezione INFN di Firenze Firenze Italy Physik-Institut Universität Zürich Zürich Switzerland University of Cincinnati Cincinnati Ohio USA University of Maryland College Park Maryland USA School of Physics and Astronomy University of Manchester Manchester United Kingdom Max-Planck-Institutfür Kernphysik (MPIK) Heidelberg Germany Laboratori Nazionali dell’INFN di Frascati Frascati Italy Institute for High Energy Physics (IHEP) Protvino Russia Syracuse University Syracuse New York USA Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Department of Physics University of Warwick Coventry United Kingdom Universitat de Barcelona Barcelona Spain Institute of Theoretical and Experimental Physics (ITEP) Moscow Russia Sezione INFN di Ferrara Ferrara Italy Cavendish Laboratory University of Cambridge Cambridge United Kingdom Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Sezione INFN di Pisa Pisa Italy Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro Brazil LPNHE Université Pierre et Marie Curie Uni

The charmless decays B±→K+K−π± and B±→π+π−π± are reconstructed in a data set of pp collisions with an integrated luminosity of 1.0 fb−1 and center-of-mass energy of 7 TeV, collected by LHCb in 2011. The inclusive charge asymmetries of these modes are measured to be ACP(B±→K+K−π±)=−0.141±0.040 (stat)±0.018 (syst)±0.007(J/ψ K±) and ACP(B±→π+π−π±)=0.117±0.021 (stat)±0.009 (syst)±0.007(J/ψ K±), where the third uncertainty is due to the CP asymmetry of the B±→J/ψK± reference mode. In addition to the inclusive CP asymmetries, larger asymmetries are observed in localized regions of phase space.

关键词： CP violation (Nuclear physics) PROTON-proton interactions LUMINOSITY CENTER of mass UNCERTAINTY (Information theory) PHASE space (Statistical physics)

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：