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Study of inclusive baryon-antibaryon pair production of p or Λ in two-photon processes

Zeitschrift für Physik C: Particles and Fields 1995年第1期69卷 597-606页

作者： Uehara, S. Abe, K. Amako, K. Arai, Y. Arima, T. Asano, Y. Chiba, M. Chiba, Y. Daigo, M. Fukawa, M. Fukushima, Y. Haba, J. Hamasaki, H. Hanai, H. Hemmi, Y. Higuchi, M. Hinode, F. Hirose, T. Homma, Y. Hosoda, N. Ishihara, N. Iwata, Y. Kanzaki, J. Kikuchi, R. Kondo, T. Korhonen, T.T. Kurashige, H. Matsuda, E.K. Matsui, T. Miura, M. Miyake, K. Mori, S. Nagashima, Y. Nakagawa, Y. Nakamura, T. Nakano, I. Odaka, S. Ogawa, K. Ohama, T. Ohsugi, T. Ohyama, H. Okabe, K. Okamoto, A. Ono, A. Oyama, T. Pennanen, J. Sakamoto, H. Sakuda, M. Sato, M. Sato, N. Shioden, M. Shirai, J. Shirakata, M. Sumiyoshi, T. Takada, Y. Takasaki, F. Takita, M. Tamura, N. Tatsumi, D. Tobimatsu, K. Tsuboyama, T. Unno, Y. Watanabe, T. Watase, Y. Yabuki, F. Yamada, Y. Yamagata, T. Yonezawa, Y. Yoshida, H. Yusa, K. KEK National Laboratory for High Energy Physics Tsukuba 305 Oho 1-1 Japan Department of Physics Tohoku University Sendai 980 Aza-Aoba Aramaki Aoba-ku Japan Institute of Applied Physics University of Tsukuba Tsukuba 305 Tennoudai 1-1-1 Japan Department of Physics Tokyo Metropolitan University Hachioji 192-03 Minami-Ohsawa 1-1 Japan Yasuda Women's Junior College Hiroshima 731-01 Yasuhigashi 6-13-1 Asa-Minami-ku Japan Faculty of Economics Toyama University Toyama 930 3190 Gofuku Japan Department of Physics Osaka University Toyonaka 560 Machikaneyama 1-1 Japan Department of Physics Kyoto University Kyoto 606 Oiwake-cho Kita-Shirakawa Sakyo-ku Japan Department of Applied Physics Tohoku-Gakuin University Tagajo 985 Chuo 1-13-1 Japan School of Applied Medical Science Kobe University Kobe 654-01 Tomogaoka 7-10-2 Suma-ku Japan Department of Physics Hiroshima University Higashi-Hiroshima 724 Kagamiyama 1-3-1 Japan Research Institute for High Energy Physics Helsinki University Helsinki SF-00170 Siltavuorenpenger 20C Finland Department of Physics Okayama University Okayama 700 Tsushimanaka 3-1-1 Japan Division of Natural Sciences International Christian University Mitaka 181 Ohsawa 3-10-2 Japan Faculty of Engineering Miyazaki University Miyazaki 889-01 Gakuen-Kibanadai-Nishi 1-1 Japan Institute of Physics University of Tsukuba Tsukuba 305 Tennoudai 1-1-1 Japan Hiroshima National College of Maritime Technology Hiroshima-ken 725-02 Higashino-cho 4272-1 Japan Faculty of Cross-Cultural Studies Kobe University Kobe 657 Tsurukabuto 1-2-1 Nada-ku Japan Department of Electronic and Computer Engineering Ibaraki College of Technology Hitachinaka 312 Nakane Japan Center for Information Science Kogakuin University Tokyo 163-91 Nishi-Shinjuku 1-24-2 Shinjuku-ku Japan Department of Physics Kogakuin University Tokyo 192 Nakano-cho 2665-1 Hachioji Japan Tsukuba College of Technology Tsukuba 305 Kasuga 4-1 Japan Naruto Universi

Inclusive baryon-antibaryon pair production was studied in two-photon events which were collected at the e + e - collider TRISTAN, and correspond to an integrated luminosity of 303 pb-1. Correlations between a baryon ...

Inclusive baryon-antibaryon pair production was studied in two-photon events which were collected at the e⁺ e^- collider TRISTAN, and correspond to an integrated luminosity of 303 pb^-1. Correlations between a baryon and an antibaryon were studied for their flavors (p or Λ) and their momentum vectors. The experimental results were compared with the expectations from a jet-fragmentation Monte Carlo simulation. We have found that although the ratios of the cross sections of different baryon-flavor combinations are consistent with the Monte Carlo expectations, the cross section shows an excess over the Monte Carlo expectation in a low invariant-mass region of final-state particles at large angles, that indicates a significant contribution from higher-order QCD or non-perturbative effects. The experimental data show no narrow azimuthal-angle correlation, which is expected from a jet-fragmentation Monte Carlo. A search for exclusive Λ pair production has also been made. We have no candidates and have obtained the upper limit for the cross section. © 1996 Springer-Verlag.

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An interactive train scheduling workbench based on artificial intelligence

An interactive train scheduling workbench based on artificia...

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Hsien-Cheng Lin Chi-Chi Hsu Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Technology Research Division Institute for Information Industry Taipei Taiwan

ISBN: (纸本)0818667850

We describe a practical train scheduling system (called TSS) designed for the Taiwan Railway Bureau (TRB). TSS has two major components. The first is Auto Scheduler which includes an initial scheduler, a conflict finder, and a conflict resolver. Auto Scheduler uses the concept of bugging as problem solving tactics. The second is Manual Scheduler which provides some effective editing functions for users to tune schedules generated by Auto Scheduler. Through an easy-to-use user interface, these components can be used to solve large-scale complex train scheduling problems.< >

关键词： Artificial intelligence Job shop scheduling Rail transportation Problem-solving User interfaces Large-scale systems Processor scheduling Belts Industrial training computer architecture

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Learning to control dynamical systems

Learning to control dynamical systems

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IEEE International Conference on Systems, Man and Cybernetics

作者： V.R. Kumar N. Mani Division of Information Technology CSIRO NSW Australia Department of Electrical and Computer Systems Engineering Monash University VIC Australia

The rapid changes and increasing complexity of social and technological systems had lead to the demand of more powerful control theories and systems. Although several adaptive control techniques have been introduced, it is not strong to many real-world problem domains where the degree of uncertainty is too high and the computational complexity grows geometrically with the number of unknown parameters and its inherent linear nature of an assumed dynamic model. With an environment which is only partially known, it is desirable that the system be able to gradually learn the characteristics of the environment so as to improve its control strategy. Hence, there is a need for systems which possess some form of "intelligence" to be robust in nature. The system should be able to learn from its experience in order to achieve some form of "intelligence". This paper describes a few works done on applying machine learning techniques to control problems.< >

关键词： Control systems Optimal control Adaptive control Electrical equipment industry Industrial control Intelligent control Learning systems Machine learning Australia Trajectory

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New project to support scientific collaboration electronically

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Eos, Transactions American Geophysical Union 1994年第26期75卷 289-298页

作者： Clauer, C.R. Rasmussen, C.E. Niciejewski, R.J. Killeen, T.L. Kelly, J.D. Zambre, Y. Rosenberg, T.J. Stauning, P. Friis‐Christensen, E. Mende, S.B. Weymouth, T.E. Prakash, A. McDaniel, S.E. Olson, G.M. Finholt, T.A. Atkins, D.E. University of Michigan Space Physics Research Laboratory Ann Arbor Michigan 48109 United States SRI International Geoscience and Engineering Center Menlo Park California 94025 333 Ravenswood Ave United States University of Maryland Institute for Physical Science and Technology College Park Maryland 20742 United States Danish Meteorological Institute Solar Terrestrial Physics Division Copenhagen Denmark Lockheed Palo Alto Research Laboratory Palo Alto California 94304 3251 Hanover St United States University of Michigan Dep. of Electrical Engineering and Computer Science Ann Arbor Michigan 48109 United States University of Michigan Cognitive Science and Machine Intelligence Laboratory Ann Arbor Michigan 48109 701 Tappan United States University of Michigan School of Information and Library Studies Ann Arbor Michigan 48109 304 W. Engineering United States

A new multidisciplinary effort is linking research in the upper atmospheric and space, computer, and behavioral sciences to develop a prototype electronic environment for conducting team science worldwide. A real‐world electronic collaboration testbed has been established to support scientific work centered around the experimental operations being conducted with instruments from the Sondrestrom Upper Atmospheric Research Facility in Kangerlussuaq, Greenland. Such group computing environments will become an important component of the National information Infrastructure initiative, which is envisioned as the high‐performance communications infrastructure to support national scientific research. ©1994. American Geophysical Union. All Rights Reserved.

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FUEL-CELL POWER-PLANTS FOR SURFACE FLEET APPLICATIONS

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 59-76页

作者： GOUBAULT, P GREENBERG, M HEIDENREICH, T WOERNER, J Philippe Goubault:graduated in 1983 from the “Ecole Nationale Superieure de Techniques Avancees” in Paris with a major in naval architecture. After one year of military service with the French navy he worked as naval architect and program director for the French navy between 1984 and 1988. He was in charge of the development of AGNES200 Surface Effect Ship design which completed its sea trials in 1992. He also was responsible for the construction of five ships (four hydrographic vessels and one experimental MCM vessel) which entered service between 1988 and 1991. He has been involved in a number of projects and studies for the U.S. Navy U.S. Coast Guard and other foreign and domestic customers. At Band Lavis & Associates Inc. Mr. Goubault has expanded the computer tools used to conduct parametric analysis of advanced hullforms and has developed cost-effectiveness assessment tools and methodologies for both commercial and military ships. Mr. Goubault is a member of ASNE. Marc Greenberg:is employed as a cost analyst at the cost and economic analysis branch systems assessment and engineering division Naval Surface Warfare Center. He provides cost estimates and analyses of Navy ship and submarine technologies and has assisted in the development of parametric cost models since 1991. Employed as an electronics engineer by the U.S. Army Information Systems Command from 1989 to 1991 he provided support in simulation design and construction of high frequency and microwave communication systems. Mr. Greenberg received his BS degree in ceramic science and engineering from the Pennsylvania State University May 1987. He is a member of MORS. Todd Heidenreich:is employed in the design analysis and tools branch systems assessment and engineering division of the Carde-rock Division Naval Surface Warfare Center. He is involved as a project naval architect in the conceptual design of future surface ship designs future technology impact assessments and the assessment of current domestic and foreign surface ship desig

This paper describes the results of a study undertaken to determine the impact of fuel cell technology on the design and effectiveness of future naval surface combatants. The study involved the collection of data to characterize four different fuel cell technologies: proton exchange membrane, molten carbonate, phosphoric acid, and solid oxide fuel cells. This information was used to expand current computer models to develop specific fuel cell plants that met the power requirements for several applications on a nominal 5000 Lton destroyer and a nominal 2000 Lton corvette. Each of the fuel cell technologies was incorporated into several applications aboard the destroyer and the corvette. These applications included combinations of centralized and distributed ship service power, and propulsion power. In addition, the impact of fuel cell technology was determined for a ship service power backfit option aboard a DDG-51 class destroyer. The results of the impact on the ship designs were analyzed and a military effectiveness assessment was conducted to address such issues as the impact of fuel cells on mobility, survivability, affordability, and on the environment. The paper identifies which aspects of the fuel cell technologies have the greatest impact upon the ship designs and their operational costs. Recommendations are given for future technology development efforts required to make fuel cells suitable for Navy service.

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STORM: A Multibus system for climate modelling 26

STORM: A Multibus system for climate modelling

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26th Hawaii International Conference on System Sciences, HICSS 1993

作者： Abramson, D. Cameron, G. Dix, M. Makies, M. Division of Information Technology C.S.I.R.O. 723 Swanston St Carlton3053 Australia Department of Computer Systems Engineering Royal Melboume Institute of Technology P.O. Box 2476V Melbourne3001 Australia Division of Atmospheric Research C.S.I.R.O. Australia

ISBN: (纸本)0818632305

The authors consider the design of a multiprocessor, called STORM, for efficient execution of large global climate modeling programs. They begin by discussing the limitations of current shared and distributed memory multiprocessors and show that a shared memory machine with only partial processor/memory interconnection can provide a scalable platform for climate model programs. A detailed analysis is presented of some memory traces taken from CSIRO 4, a real model developed and used by the CSIRO division of Atmospheric Research in Australia. A prototype of STORM built from Sun SparcStations is described. © 1993 IEEE.

关键词： Climate models

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Invariant surface and motion estimation from sparse range data

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Journal of Mathematical Imaging and Vision 1992年第1期1卷 43-43页

作者： Vemuri, Baba C. Skofteland, Gunliev Department of Computer & Information Sciences University of Florida Gainesville University of Trondheim Division of Engineering and Cybernetics Norwegian Institute of Technology Trondheim Norway

In this paper, we present a system for the estimation of the surface structure and the motion parameters of a free-flying object in a tele-robotics experiment. The system consists of two main components: (i) a vision-based invariant-surface and motion estimator and (ii) a Kalman filter state estimator. We present a new algorithm for motion estimation from sparse multi-sensor range data. The motion estimates from the vision-based estimator are input to a Kalman filter state estimator for continuously tracking a free-flying object in space under zero-gravity conditions. The predicted position and orientation parameters are then fed back to the vision module of the system and serve as an initial guess in the search for optimal motion parameters. The task of the vision module is two-fold: (i) estimating a piecewise-smooth surface from a single frame of multi-sensor data and (ii) determining the most likely (in the Bayesian sense) object motion that makes data in subsequent time frames to have been sampled from the same piecewise-smooth surface. With each incoming data frame, the piecewise-smooth surface is incrementally refined. The problem is formulated as an energy minimization and solved numerically resulting in a surface estimate invariant to 3D rigid motion and the vector of motion parameters. Performance of the system is depicted on simulated and real range data.

关键词： affine invariant Bayesian framework invariant surface motion estimation range data reconstruction thin-plate-membrane splines

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FFG-61 PROTOTYPE DIGITAL TECHNICAL LIBRARY

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NAVAL ENGINEERS JOURNAL 1992年第2期104卷 58-68页

作者： VINROOT, CA ORNER, JG USN Capt. Charles A. Vinroot USN (Ret.)retired from the U.S. Navy in September 1991 following over 27 years of active duty as an engineering duty officer. He holds a BSEE from North Carolina State University and a MSEE and professional degree from the U.S. Naval Postgraduate School. During his naval career he served on USSIndependence (CVA-62) and USSLuce (DLC-7/DDC-38). He also served at Supship Quincy Mass. and Hunters Point Naval Shipyard. He was stationed in Washington D.C. with assignments at CNO (OP 98) ASN (S&L) and the Naval Sea Systems Command. Captain Vinroot was technical director of the Battleship Reactivation Program (PMS 378) technical director of the Destroyer Acquisition Program (PMS 389) and deputy program manager of the Amphibious Warfare and Strategic Sealift Program (PMS 377). Most recently he served as program manager for Gas Turbine Surface Combatants (PMS 314) and Surface Combatants (PMS 330). Captain Vinroot is now employed by PRC Inc. and serves as technical director for the Advanced Technology Division in Crystal City Va. Jeffery G. Ornergraduated from Wittenberg University in Springfield Ohio in 1979 with a bachelor of arts degree in political science and earned a master's of science degree in business from The American University in Washington D.C. in 1982. He has ten years of professional experience with the Naval Sea Systems Command in positions with responsibilities for logistic support planning policy and delivery computer-aided acquisition and logistic support and Fleet Modernization Program (FMP) and ship construction issues. He was a key player in establishing the current FMP integrated logistic support (ILS) process and in implementing of the Ships' Configuration and Logistic Support Information System (SCLSIS). His current position as Fleet Logistic Support Branch head for the Surface Combatant Program includes responsibility for logistic support and management of ship configuration and logistic data for all surface combatant ships (except for Aegis ships). In

USS Ingraham (FFG-61) is the prototype ship for NavSea's Advanced Technical information System (ATIS). ATIS is a digital technical library, which holds on optical disks the ship's 2,000 technical manuals and 73,000 drawing sheets. It contains a detailed ship's configuration index (derived from SCLSIS) to lead the user to the proper drawing or manual, and it replaces the ship's aperture cards and the second (library) copy of the technical manuals. ATIS, and the data standards established and tested through ATIS development, will be the technical library portion of micro-SNAP and SNAP III. It also forms an important part of NavSea's plans to utilize EDMICS data. This paper describes the goals and technical concepts behind the development of ATIS. Problems encountered, solutions developed, and lessons learned are detailed. Special attention was paid to the application of the computer Aided Acquisition and Logistic Support (CALS) standards, problems caused by conflicts and ambiguities in those standards, the standards. Original program goals are compared with actual operational experiences. Plans for future expansion are outlined, including applications of this technology in the availability planning and execution process. A comparison is developed among the various methods of optical imaging and their costs and benefits.

关键词： information Retrieval Systems

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Motion estimation from multi-sensor data for tele-robotics

Motion estimation from multi-sensor data for tele-robotics

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1990 IEEE International Workshop on Intelligent Motion Control, IMC 1990

作者： Vemuri, B.C. Skoftoland, G. Department of Computer and Information Sciences University of Florida GainesvilleFL32611 United States Norwegian Institute of Technology University of Trondheim Division of Engineering and Cybernetics TrondheimN 7031 Norway

*** object motion from time-varying multi-sensor data ami fusing this data, into a. coherent map of the object and/or its environment are important problems in robotics. In this paper, we present a new algorithm for motion estimation from sparse range data, obtni ned from multiple sensors - laser range finder ami a. stereo-camera system. The motion estimates from this algorithm are input to a Kal man filter based state estimator for continnosly tracking a free-living object in space under zero gravity conditions. The algorithm presented here is currently being tested for use in a telc-robotic experiment at the German Aerospace Research Institute (l)LR). Our motion estimation algorithm consists of two stages namely,. (I) estimating a piece-wise smooth surface from a single frame of I he sparse multi-sensor data, and (2) determining the motion parameters and incrementally refining the piece-wise smooth surface from a dynamic sequence of the multi-sensor data. The data are aquired from a pair of ced TV cameras and an array of triangnlalion range finders all mounted on a multi-sensor gripper housed in the arm of a robot. for each time frame of the motion sequence, multi-sensor data are fused into a. single sensor-based reference frame. A motion estimate is obtained by determining the geometric transformation which makes it most likely (in the Bayesian sense) that the multi-sensor data in two successive frames came from the *** surface. We derive an energy equation that consists of two terms, one that measures the smooth ness value of the surface ("strain energy"), and the other, a distance measure between the surface to be estimated and the data points from frame i and the transformed points from frame i + 1 ("spring energy"). This energy equation is a. nonlinear function of the surface being estimated and the motion parameters. We employ a. well known numerical procedure in solving this minimization" namely, the continuation method. The salient features of ou

关键词： Motion estimation

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Fault tolerance of a class of double-loop networks

Fault tolerance of a class of double-loop networks

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： J.M. Peha F.A. Tobagi Information and Telecommunication Sciences and Technology Division SRI International Inc. Menlo Park CA USA Computer Systems Laboratory Department of Electrical Engineering University of Stanford Stanford CA USA

ISBN: (纸本)0818620498

An analysis is made of the fault tolerance of a class of double-loop networks referred to as forward-loop backward-hop (FLBH) networks, in which each node is connected by unidirectional links to the node one hop in front of it and to the node S hops in back of it for some S. A measure of fault tolerance is described along with techniques based on Markov chains to calculate quickly and efficiently the upper and lower bounds on the fault tolerance of this network topology. The results of the calculations provide a more precise description of network fault tolerance than has been achieved with previously published techniques.< >

关键词： Fault tolerance Network topology computer networks Fault tolerant systems Telecommunication network topology Protocols Hardware FDDI Sea measurements Particle measurements

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