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Characterization of affine Steiner triple systems and Hall triple systems

Electronic Notes in Discrete Mathematics 2007年第SPEC. ISS.期29卷 17-21页

作者： Máčajová, Edita Pór, Attila Sereni, Jean-Sébastien Institute for Theoretical Computer Science (ITI) Faculty of Mathematics and Physics Charles University 118 00 Prague Malostranske namesti 25 Czech Republic Department of Computer Science Faculty of Mathematics Physics and Informatics 842 48 Bratislava Mlynská dolina Slovakia Department of Applied Mathematics Faculty of Mathematics and Physics Charles University 118 00 Prague Malostranske namesti 25 Czech Republic Department of Applied Mathematics Faculty of Mathematics and Physics Charles University 118 00 Prague Malostranske namesti 25 Czech Republic

It is known that a Steiner triple system is projective if and only if it does not contain the four-triple configuration C14. We find three configurations such that a Steiner triple system is affine if and only if it does not contain any of these configurations. Similarly, we characterize Hall triple systems, a superclass of affine Steiner triple systems, using two forbidden configurations. © 2007 Elsevier B.V. All rights reserved.

关键词： Hall triple systems Steiner triple systems

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Edge-colorings of cubic graphs with elements of point-transitive Steiner triple systems

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Electronic Notes in Discrete Mathematics 2007年第SPEC. ISS.期29卷 23-27页

A cubic graph G is S-edge-colorable for a Steiner triple system S if its edges can be colored with points of S in such a way that the points assigned to three edges sharing a vertex form a triple in S. We show that a cubic graph is S-edge-colorable for every non-trivial affine Steiner triple system S unless it contains a well-defined obstacle called a bipartite end. In addition, we show that all cubic graphs are S-edge-colorable for every non-projective non-affine point-transitive Steiner triple system S. © 2007 Elsevier B.V. All rights reserved.

关键词： cubic graphs edge-colorings Steiner triple systems

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Multijet cross sections in charged current e±p scattering at HERA

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Physical Review D 2008年第3期78卷 032004-032004页

作者： S. Chekanov M. Derrick S. Magill B. Musgrave D. Nicholass J. Repond R. Yoshida M. C. K. Mattingly M. Jechow N. Pavel P. Antonioli G. Bari L. Bellagamba D. Boscherini A. Bruni G. Bruni F. Cindolo M. Corradi G. Iacobucci A. Margotti R. Nania A. Polini S. Antonelli M. Basile M. Bindi L. Cifarelli A. Contin S. De Pasquale G. Sartorelli A. Zichichi D. Bartsch I. Brock H. Hartmann E. Hilger H.-P. Jakob M. Jüngst A. E. Nuncio-Quiroz E. Paul R. Renner U. Samson V. Schönberg R. Shehzadi M. Wlasenko N. H. Brook G. P. Heath J. D. Morris M. Capua S. Fazio A. Mastroberardino M. Schioppa G. Susinno E. Tassi J. Y. Kim Z. A. Ibrahim B. Kamaluddin W. A. T. Wan Abdullah Y. Ning Z. Ren F. Sciulli J. Chwastowski A. Eskreys J. Figiel A. Galas M. Gil K. Olkiewicz P. Stopa L. Zawiejski L. Adamczyk T. Bołd I. Grabowska-Bołd D. Kisielewska J. Łukasik M. Przybycień L. Suszycki A. Kotański W. Słomiński U. Behrens C. Blohm A. Bonato K. Borras R. Ciesielski N. Coppola V. Drugakov S. Fang J. Fourletova A. Geiser P. Göttlicher J. Grebenyuk I. Gregor T. Haas W. Hain A. Hüttmann F. Januschek B. Kahle I. I. Katkov U. Klein U. Kötz H. Kowalski E. Lobodzinska B. Löhr R. Mankel I.-A. Melzer-Pellmann S. Miglioranzi A. Montanari T. Namsoo D. Notz A. Parenti L. Rinaldi P. Roloff I. Rubinsky R. Santamarta U. Schneekloth A. Spiridonov D. Szuba J. Szuba T. Theedt G. Wolf K. Wrona A. G. Yagües Molina C. Youngman W. Zeuner W. Lohmann S. Schlenstedt G. Barbagli E. Gallo P. G. Pelfer A. Bamberger D. Dobur F. Karstens N. N. Vlasov P. J. Bussey A. T. Doyle W. Dunne M. Forrest M. Rosin D. H. Saxon I. O. Skillicorn I. Gialas K. Papageorgiu U. Holm R. Klanner E. Lohrmann P. Schleper T. Schörner-Sadenius J. Sztuk H. Stadie M. Turcato C. Foudas C. Fry K. R. Long A. D. Tapper T. Matsumoto K. Nagano K. Tokushuku S. Yamada Y. Yamazaki A. N. Barakbaev E. G. Boos N. S. Pokrovskiy B. O. Zhautykov V. Aushev M. Borodin A. Kozulia M. Lisovyi D. Son J. de Favereau K. Piotrzkowski F. Barreiro C. Glasman M. Jimenez L. Labarga J. del Peso E. Ron M. Soares J. Terrón M. Zambrana F Argonne National Laboratory Argonne Illinois 60439-4815 USA Andrews University Berrien Springs Michigan 49104-0380 USA Institut für Physik der Humboldt-Universität zu Berlin Berlin Germany INFN Bologna Bologna Italy University and INFN Bologna Bologna Italy Physikalisches Institut der Universität Bonn Bonn Germany H. H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Calabria University Physics Department and INFN Cosenza Italy Chonnam National University Kwangju Republic of Korea Jabatan Fizik Universiti Malaya 50603 Kuala Lumpur Malaysia Nevis Laboratories Columbia University Irvington on Hudson New York 10027 USA The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Cracow Poland Faculty of Physics and Applied Computer Science AGH-University of Science and Technology Cracow Poland Department of Physics Jagellonian University Cracow Poland Deutsches Elektronen-Synchrotron DESY Hamburg Germany Deutsches Elektronen-Synchrotron DESY Zeuthen Germany INFN Florence Florence Italy University and INFN Florence Florence Italy Fakultät für Physik der Universität Freiburg i.Br. Freiburg i.Br. Germany Department of Physics and Astronomy University of Glasgow Glasgow United Kingdom Department of Engineering in Management and Finance University of Aegean Greece Hamburg University Institute of Experimental Physics Hamburg Germany Imperial College London High Energy Nuclear Physics Group London United Kingdom Institute of Particle and Nuclear Studies KEK Tsukuba Japan Institute of Physics and Technology of Ministry of Education and Science of Kazhakhstan Almaty Kazhakhstan Institute for Nuclear Research National Academy of Sciences Kiev and Kiev National University Kiev Ukraine Kyungpook National University Center for High Energy Physics Daegu Republic of Korea Institut de Physique Nucléaire Université Catholique de Louvain Louvain-la-Neuve Belgium Departamento de Física Teórica Universidad Autónoma de

Jet cross sections were measured in charged-current deep inelastic e±p scattering at high boson virtualities Q2 with the ZEUS detector at HERA II using an integrated luminosity of 0.36 fb−1. Differential cross sections are presented for inclusive-jet production as functions of Q2, Bjorken x and the jet transverse energy and pseudorapidity. The dijet invariant mass cross section is also presented. Observation of three- and four-jet events in charged-current e±p processes is reported for the first time. The predictions of next-to-leading-order (NLO) QCD calculations are compared to the measurements. The measured inclusive-jet cross sections are well described in shape and normalization by the NLO predictions. The data have the potential to constrain the u and d valence-quark distributions in the proton if included as input to global fits.

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Consideration of security in telehealth wireless sensor network monitoring systems

Consideration of security in telehealth wireless sensor netw...

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3rd IASTED International Conference on Telehealth, Telehealth 2007

作者： Adams, Jocelyn Eklund, J. Mikael Roosta, Tanya Bajcsy, Ruzena Sastry, Shankar Department of Engineering Physics Brown University Faculty of Engineering and Applied Science University of Ontario Institute of Technology Department of Electrical Engineering and Computer Sciences University of California Berkeley CA United States

ISBN: (纸本)9780889866676

Wireless sensor networks (WSNs) provide the potential for effective and cost efficient remote and ubiquitous health care monitoring as they are easy to install, robust and secure. By their nature, these WSNs use asynchronous communications to reduce transmission power and improve efficiency. However this form of communication creates potential issues with the synchronization of the data received and stored by the telehealth system that they provide data to. This problem can be exacerbated if multiple sensors are employed, which is very likely due to the relatively low cost of such devices as well as the intended applications of these WSNs. Time synchronization is one essential component to maintain in the security of data transmission through wireless sensor networks (WSN). Each individual node in a WSN contains a crystal clock. Although the natural frequency of each crystal clock remains relatively constant, the quality of the crystal and environmental factors such as temperature cause the frequency to drift over time. In order to ensure that each node maintains and broadcasts the same global time within the micro-second range, a time synchronization protocol must be implemented. Several protocols have been developed;however, none has been developed with security in mind. It is easy for a system error or even a malicious third party to compromise a node, causing faulty time sync messages to be sent into the network. The Flooding Time Synchronization Protocol (FTSP) [5] is proposed to ensure time sychrony in the telehealh WSN. The FTSP is made up of several component modules written in nesC and has been implemented in the TinyOS [1] environment. TinyOS is an open source operating system developed specifically for network systems. In order to investigate the effects of injecting bad time synchronization messages into a WSN implemented with the FTSP, one or two nodes in a testbed of Telos motes (a mote being a remote wireless sensor) have been programmed to send fault

关键词： Assisted living

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N-XYTER -A CMOS read-out ASIC for a new generation of high rate multichannel counting mode neutron detectors

N-XYTER -A CMOS read-out ASIC for a new generation of high r...

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12th Workshop on Electronics for LHC and Future Experiments, LECC 2006

作者： Brogna, A.S. Buzzetti, S. Dabrowski, W. Fiutowski, T. Gebauer, B. Klein, M. Schmidt, C.J. Soltveit, H.K. Solvag, K. Szczygiel, R. Trunk, U. Wiacek, P. Physikalisches Institut Universität Heidelberg Heidelberg Germany Faculty of Physics and Applied Computer Science AGH University of Science and Technology Krakow Poland Hahn-Meitner-Institut Berlin Germany INFM and Politecnico di Milano Milan Italy Gesellschaft Für Schwerionenforschung Darmstadt Germany Institute of Nuclear Physics Polish Academy of Sciences Krakow Poland Max-Planck-Institut für Kernphysik Heidelberg Germany

ISBN: (纸本)9789290832881

For a new generation of 2-D neutron detectors developed in the framework of the EU NMI3 project DETNI [1], the 128-channel frontend chip n-XYTER has been designed. To facilitate the reconstruction of single neutron incidence points, the chip has to provide a spatial coordinate (represented by the channel number), as well as time stamp and amplitude information to match the data of x-and y-coordinates. While the random nature of the input signals calls for self-triggered operation of the chip, on-chip derandomisation and sparsification is required to exploit the enormous rate capability of these detectors (≥ 4 × 106cm-2s-1). The chosen architecture implements a preamplifier driving two shapers with different time constants per channel. The faster shaper drives a single-pulse discriminator with subsequent time-walk compensation. The output of this circuit is used to latch a 14-bit time stamp with a ≤ 2 ns resolution and to enable a peak detector circuit fed by the slower shaper branch. The analogue output of the peak detector as well as the time stamp are stored in a 4-stage FIFO for derandomisation. The readout of these FIFOs is accomplished by a token-ring based multiplexer working at 32 MHz, which accounts for further derandomisation, sparsification and dynamic bandwidth distribution. The chip was submitted for manufacturing in AMS's C35B4M3 0.35μm CMOS technology in June 2006.

关键词： Application specific integrated circuits

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Signatures of lateral coupling of double quantum dots in the exciton photoluminescence spectrum

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Physical Review B 2007年第19期76卷 195442-195442页

作者： B. Szafran F. M. Peeters Faculty of Physics and Applied Computer Science AGH University of Science and Technology Aleja Mickiewicza 30 30-059 Kraków Poland Departement Fysica Universiteit Antwerpen Groenenborgerlaan 171 B-2020 Antwerpen Belgium

We study an electron-hole pair in laterally coupled self-assembled quantum dots with an electric field applied in the plane of confinement. The interparticle correlations and the carrier distribution are calculated using a configuration interaction approach for dots with circular and square symmetry. We extract universal features of the photoluminescence spectra specific to the lateral coupling configuration and point out the differences with vertically coupled dots. These specific features include additional avoided crossings of the lowest bright exciton level as function of the external field. In the case of strong coupling, the avoided crossing related to exciton dissociation is anomalous and involves an interaction of three or four energy levels. The latter is a consequence of the hole state mixing appearing at the electron transfer between the dots.

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VPN based data acquisition system for KASKA prototype detector

VPN based data acquisition system for KASKA prototype detect...

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2007 15th IEEE-NPSS Real-Time Conference, RT

作者： Sakamoto, Y. Furuta, H. Tabata, H. Suekane, F. Nagasaka, Y. Department of Information Science Faculty of Liberal Arts Tohoku Gakuin University Tenjinsawa 2-1-1 Izumiku Sendai 981-3193 Japan Department of Physics Graduate School of Science and Engineering Tokyo Institute of Technology Department of Physics Graduate School of Science Tohoku University Research Center for Neutrino Science Tohoku University Department of Computer Science Faculty of Applied Information Science Hiroshima Institute of Technology

ISBN: (纸本)1424408679

KASKA is a Japanese neutrino oscillation experiment to measure the neutrino mixing angle 813 by using reactor neutrinos. This collaboration had conducted studies for the actual experiment till recently, march of 2007. As one of the studies, a prototype detector had been constructed and that is used for various studies. As almost of the prototype studies have been finished, we decided to do a trial to detect actual neutrino events at the experimental fast reactor JOYO by using the prototype detector. To detect a neutrino event from a fast reactor is experimental attempt. This paper describes briefly a present status of the experiment in focusing to the outline of DAQ, monitoring system and controlling system used there. © 2007 IEEE.

关键词： Fast reactors

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The multi-scale FEM simulation of wire fracture during drawing of perlitic steel

The multi-scale FEM simulation of wire fracture during drawi...

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第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： Andriy Milenin Zbigniew Muskalski Piotr Kustra Department of Applied Computer Science and Modeling AGH University of Science and Technology Krakow Poland Department of Materials Processing Technology and Applied Physics Czestochowa University of Technology Poland

The fracture development during wire drawing operation is an important phenomenon governing the productivity as well as the mechanical properties of the drawn wire. The wire drawing processes was investigated in present paper in two separate levels - using the 2-dimensional rigid-plastic finite element method (macro-level) and modelling the microstructure changes (micro-level) by the Representative Volume Elements (RVEs). To predict fracture initiation the phenomenological theory of fracture is used. The influence of initial cementite lamellas orientation on triaxity factor and localization of deformation in micro-level is investigated. Obtained results are helpful for a fundamental understanding of pearlitic deformation during development of high strength steel wires for tire cord applications.

关键词： The multi-scale FEM simulation of wire fracture during drawing of perlitic steel simulation FEM

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Stark effect on the exciton spectra of vertically coupled quantum dots: Horizontal field orientation and nonaligned dots

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Physical Review B 2007年第11期75卷 115303-115303页

作者： B. Szafran F. M. Peeters S. Bednarek Faculty of Physics and Applied Computer Science AGH University of Science and Technology al. Mickiewicza 30 30-059 Kraków Poland Departement Fysica Universiteit Antwerpen Groenenborgerlaan 171 B-2020 Antwerpen Belgium

We study the effect of an electric field on an electron-hole pair in an asymmetric system of vertically coupled self-assembled quantum dots taking into account their nonperfect alignment. We show that the nonperfect alignment does not qualitatively influence the exciton Stark effect for the electric field applied in the growth direction, but can be detected by application of a perpendicular electric field. We demonstrate that the direction of the shift between the axes of nonaligned dots can be detected by rotation of a weak electric field within the plane of confinement. Already for a nearly perfect alignment the two-lowest energy bright exciton states possess antilocked extrema as a function of the orientation angle of the horizontal field which appear when the field is parallel to the direction of the shift between the dot centers.

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Surface diffusion and island growth

Surface diffusion and island growth

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作者： Reitinger, R. Pfau, B. Stadler, L.-M. Stankov, S. Zajac, M. Spiridis, N. Sepiol, B. Zontone, F. Korecki, J. Scattering and Spectroscopy Group Faculty of Physics University of Vienna Strudlhofgasse 4 1090 Vienna Austria BESSY GmbH Albert-Einstein-Strasse 15 12489 Berlin Germany European Synchrotron Radiation Facility BP 220 38043 Grenoble Cedex France Department of Solid State Physics Faculty of Physics and Applied Computer Science AGH University of Science and Technology al. Mickiewicza 30 30-059 Krakow Poland Institute of Catalysis and Surface Chemistry PAN ul. Niezapominajek 8 30-239 Kraków Poland

Grazing-Incidence Small Angle X-ray Scattering (GISAXS) and X-Ray Photon Correlation Spectroscopy (XPCS) studies of island growth in two different systems are presented: 5 ML of iron on MgO(001) and 10 ML of iron on Au(001). Due to a missing conducting surface Fe/MgO thinner than approximately 20 ML could not be studied previously by common methods like STM. Fe/Au(001) is interesting as atoms of gold diffuse easily through iron layers and form precipitates. The coarsening dynamics of these precipitates is investigated by XPCS in GISAXS geometry. Their growth depends on the crystallographic directions of the substrate and correlates with the morphology measured by STM microscopy. Measurements were performed at the ESRF in Grenoble.

关键词： Diffusion

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