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Wolfgang Wagner

Bio: Wolfgang Wagner is an academic researcher from Vienna University of Technology. The author has contributed to research in topics: Large Hadron Collider & Top quark. The author has an hindex of 156, co-authored 2342 publications receiving 123391 citations. Previous affiliations of Wolfgang Wagner include University of Pennsylvania & University of Amsterdam.


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TL;DR: In this article, a new functional form for multiparameter equations of state was developed for non-and weakly polar fluids and for polar fluids, which were established with an optimization algorithm which considers data sets for different fluids simultaneously.
Abstract: New functional forms for multiparameter equations of state have been developed for non- and weakly polar fluids and for polar fluids. The resulting functional forms, which were established with an optimization algorithm which considers data sets for different fluids simultaneously, are suitable as a basis for equations of state for a broad variety of fluids. With regard to the achieved accuracy, the functional forms were designed to fulfill typical demands of advanced technical application. They are numerically very stable, and their substance-specific coefficients can easily be fitted to restricted data sets. In this way, a fast extension of the group of fluids for which accurate empirical equations of state are available becomes possible. This article deals with characteristic features of the new class of simultaneously optimized equations of state. Shortcomings of existing multiparameter equations of state widely used in technical applications are briefly discussed, and demands on the new class of equations of state are formulated. Substance specific parameters and detailed comparisons are given in subsequent articles for the non- and weakly polar fluids (methane, ethane, propane, isobutane, n-butane, n-pentane, n-hexane, n-heptane, n-octane, argon, oxygen, nitrogen, ethylene, cyclohexane, and sulfur hexafluoride) and for the polar fluids (trichlorofluoromethane (CFC-11), dichlorodifluoromethane (CFC-12), chlorodifluoromethane (HCFC-22), difluoromethane (HFC-32), 1,1,2-trichlorotrifluoroethane (CFC-113), 2,2-dichloro-1,1,1-trifluoroethane (HCFC-123), pentafluoroethane (HFC-125), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,1-trifluoroethane (HFC-143a), 1,1-difluoroethane (HFC-152a), carbon dioxide, and ammonia) considered to date.

237 citations

Journal ArticleDOI
J. Ahrens1, Xinhua Bai2, R. C. Bay3, S. W. Barwick4, T. Becka1, J. K. Becker, K.-H. Becker, Elisa Bernardini, D. Bertrand5, A. Biron, D. J. Boersma, S. Böser, Olga Botner6, Adam Bouchta6, Othmane Bouhali5, T. Burgess7, Staffan Carius, T. Castermans8, Dmitry Chirkin3, B. Collin9, Jan Conrad6, Jodi Cooley10, D. F. Cowen9, Anna Davour6, C. De Clercq11, T. DeYoung12, Paolo Desiati10, J. P Dewulf5, P. Ekström, T. Feser1, Markus Gaug, Thomas K. Gaisser2, R. Ganugapati10, Heiko Geenen, L. Gerhardt4, Axel Groß, A. Goldschmidt13, Allan Hallgren6, Francis Halzen10, Kael Hanson10, R. Hardtke10, Torsten Harenberg, T. Hauschildt, K. Helbing13, M. Hellwig1, P. Herquet8, G. C. Hill10, D. Hubert11, B. Hughey10, P. O. Hulth7, K. Hultqvist7, S. Hundertmark7, Janet Jacobsen13, Albrecht Karle10, M. Kestel9, L. Köpke1, Marek Kowalski, K. Kuehn4, J. I. Lamoureux13, H. Leich, Matthias Leuthold, P. Lindahl, I. Liubarsky14, James Madsen15, Pawel Marciniewski6, H. S. Matis13, C. P. McParland13, T. Messarius, Y. Minaeva7, P. Miocinovic3, P. C. Mock4, R. Morse10, K. Münich, J. W. Nam4, R. Nahnhauer, T. Neunhöffer1, P. Niessen11, D. R. Nygren13, Hakki Ögelman10, Ph. Olbrechts11, C. Pérez de los Heros6, A. C. Pohl7, R. Porrata4, P. B. Price3, Gerald Przybylski13, K. Rawlins10, Elisa Resconi, Wolfgang Rhode, M. Ribordy8, S. Richter10, J. Rodríguez Martino7, D. Ross4, H. G. Sander1, K. Schinarakis, S. Schlenstedt, T. O. B. Schmidt, David A. Schneider10, R. Schwarz10, A. Silvestri4, M. Solarz3, Glenn Spiczak15, Christian Spiering, Michael Stamatikos10, D. Steele10, P. Steffen, R. G. Stokstad13, K. H. Sulanke, Ole Streicher, I. Taboada16, L. Thollander7, S. Tilav2, Wolfgang Wagner, C. Walck7, Yajun Wang10, C. H. Wiebusch, C. Wiedemann7, R. Wischnewski, H. Wissing, Kurt Woschnagg3, G. B. Yodh4 
TL;DR: In this paper, the authors describe different methods of reconstruction, which have been successfully implemented within AMANDA, and optimize the reconstruction performance and rejecting background for a typical analysis procedure the direction of tracks are reconstructed with about 2° accuracy.
Abstract: The Antarctic Muon And Neutrino Detector Array (AMANDA) is a high-energy neutrino telescope operating at the geographic South Pole. It is a lattice of photo-multiplier tubes buried deep in the polar ice between 1500 and 2000 m. The primary goal of this detector is to discover astrophysical sources of high-energy neutrinos. A high-energy muon neutrino coming through the earth from the Northern Hemisphere can be identified by the secondary muon moving upward through the detector. The muon tracks are reconstructed with a maximum likelihood method. It models the arrival times and amplitudes of Cherenkov photons registered by the photo-multipliers. This paper describes the different methods of reconstruction, which have been successfully implemented within AMANDA. Strategies for optimizing the reconstruction performance and rejecting background are presented. For a typical analysis procedure the direction of tracks are reconstructed with about 2° accuracy. © 2004 Elsevier B.V. All rights reserved.

234 citations

Journal ArticleDOI
TL;DR: In this paper, a new apparatus has been specially developed for accurate measurements of the saturated-liquid and -vapour densities of pure fluids together with the vapour pressure along the whole coexistence curve (ranges covered: 50 to 350 K, 0.003 K and 0.02 K below the critical temperature).

232 citations

01 Jan 2004
TL;DR: In this article, the authors discuss the physical measurement process and explain the way how distributed targets (such as trees or inclined surfaces) transform the emitted pulse, and further show through theoretical experiments that different detectors may yield quite different height information, depending on the type of the target.
Abstract: Airborne laser scanning, often referred to as lidar or laser altimetry, is a remote sensing technique which measures the round-trip time of emitted laser pulses to determine the topography of the Earth’s surface. While the first commercially available airborne laser scanners recorded only the time of one backscattered pulse, state-of-the-art systems measure first and last pulse; some are able to measure up to five pulses. This is because there may be several objects within the travel path of the laser pulse that generate multiple echoes. Pulse detection is then used to determine the location of these individual scatterers. In this paper we discuss the physical measurement process and explain the way how distributed targets (such as trees or inclined surfaces) transform the emitted pulse. It is further shown through theoretical experiments that different detectors may yield quite different height information, depending on the type of the target. For example, even in the simple case of a tilted roof (with a tilt angle of 45°) the range values obtained by using different detectors may vary by ~ 0.4 m for a laser footprint size of 1 m. Airborne laser scanner systems that digitise the full waveform of the backscattered pulse would give more control to the user in the interpretation process. It would e.g. be possible to pre-classify the acquired data with respect to the shape of the echoes, to use different detection methods depending on surface cover and the intended application, and to employ more physically-based retrieval methods. * Corresponding author

231 citations

Journal ArticleDOI
Georges Aad1, Brad Abbott2, J. Abdallah, A. A. Abdelalim3  +3056 moreInstitutions (193)
TL;DR: In this article, the authors used the ATLAS detector at the Large Hadron Collider (LHC) to measure inclusive jet and dijet cross sections in proton-proton collisions at a centre-of-mass energy of 7 TeV using the anti-kT algorithm.
Abstract: Inclusive jet and dijet cross sections have been measured in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector at the Large Hadron Collider. The cross sections were measured using jets clustered with the anti-kT algorithm with parameters R=0.4 and R=0.6. These measurements are based on the 2010 data sample, consisting of a total integrated luminosity of 37 inverse picobarns. Inclusive jet double-differential cross sections are presented as a function of jet transverse momentum, in bins of jet rapidity. Dijet double-differential cross sections are studied as a function of the dijet invariant mass, in bins of half the rapidity separation of the two leading jets. The measurements are performed in the jet rapidity range |y|<4.4, covering jet transverse momenta from 20 GeV to 1.5 TeV and dijet invariant masses from 70 GeV to 5 TeV. The data are compared to expectations based on next-to-leading order QCD calculations corrected for non-perturbative effects, as well as to next-to-leading order Monte Carlo predictions. In addition to a test of the theory in a new kinematic regime, the data also provide sensitivity to parton distribution functions in a region where they are currently not well-constrained.

230 citations


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08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

01 May 1993
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
Abstract: Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.

29,323 citations

28 Jul 2005
TL;DR: PfPMP1)与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作�ly.
Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1(PfPMP1)与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员,通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

18,940 citations

Journal ArticleDOI
TL;DR: In this paper, Imagined communities: Reflections on the origin and spread of nationalism are discussed. And the history of European ideas: Vol. 21, No. 5, pp. 721-722.

13,842 citations

Journal ArticleDOI
TL;DR: Reading a book as this basics of qualitative research grounded theory procedures and techniques and other references can enrich your life quality.

13,415 citations