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排序方式: 共有369条查询结果,搜索用时 187 毫秒
31.
Tkaczyk S Tollefson K Tollestrup A Toyoda H Trischuk W de Troconiz JF Tseng J Turini N Ukegawa F Valls J Vejcik S Velev G Vidal R Vilar R Vologouev I Vucinic D Wagner RG Wagner RL Wahl J Wallace NB Walsh AM Wang C Wang CH Wang MJ Watanabe T Waters D 《Physical review letters》2000,84(6):1110-1115
We search for color singlet technirho and technipion production in p&pmacr; collisions at sqrt[s] = 1.8 TeV recorded with the Collider Detector at Fermilab. These exotic technimesons are present in a model of walking technicolor. The signatures studied are lepton plus two jets plus E(T) and multijet final states. No excess of events is seen in either final state. We set an upper limit on the technirho production cross section and exclude a region in the technipion mass versus technirho mass plane. 相似文献
32.
Toyoda H Trischuk W de Troconiz JF Tseng J Turini N Ukegawa F Vaiciulis T Valls J Vejcik S Velev G Vidal R Vilar R Volobouev I Vucinic D Wagner RG Wagner RL Wahl J Wallace NB Walsh AM Wang C Wang CH Wang MJ Watanabe T Waters D Watts T Webb R 《Physical review letters》2000,84(22):5043-5048
We report results from a study of events with a leading antiproton of beam momentum fraction 0.9057 GeV. Using the dijet events, we evaluate the diffractive structure function of the antiproton and compare it with expectations based on results obtained in diffractive deep inelastic scattering experiments at the DESY ep collider HERA. 相似文献
33.
M.A. Schneider P. Wahl L. Vitali L. Diekhöner R. Vogelgesang K. Kern 《Applied Physics A: Materials Science & Processing》2007,88(3):443-447
We use scanning tunneling microscopy and spectroscopy to study the energy dependence of hot-electron scattering processes
on metal surfaces via the determination of the energy-dependent phase-coherence length. From this an electron lifetime can
be determined, which in the case of electrons in the surface state of Ag(111) and in the case of the n=1 image-potential state
on Cu(100) shows good agreement with theoretical modeling and other experimental data. The method is based on the quantitative
analysis of electron interference patterns. A theoretical analysis shows that the phase-coherence length can be determined
in confining nanostructures of a characteristic length scale smaller than the phase-coherence length.
PACS 73.20.At; 73.50.Gr; 72.10.Fk; 68.37.Ef 相似文献
34.
Stephanie L. Gantt Nancy B. Valentine Adam J. Saenz Mark T. Kingsley Karen L. Wahl 《Journal of the American Society for Mass Spectrometry》1999,10(11):1131-1137
A method to aid in the analysis of bacterial samples of unknown concentration by matrix-assisted laser desorption/ionization (MALDI) mass spectrometry is demonstrated. It is shown that in MALDI analysis of bacteria, the intensities of resulting peaks in spectra are sensitive to the microbial concentration. At the high and low ends of the concentration range, no signal can be obtained, leaving very concentrated or very dilute samples indistinguishable. The addition of cytochrome c as an internal control allows the differentiation of these concentrated and dilute samples. The presence of the internal control causes only a 20% to 30% decrease in signal intensity when the bacterial concentration is optimum. However, the signal quality is improved when the internal control is added to some low concentrations of bacteria. 相似文献
35.
K-G Dietrich D. H. H. Hoffmann H. Wahl C. R. Haas H. Kunze W. Brandenburg R. Noll 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1990,16(4):229-230
The energy loss of heavy ions with an energy of 1.4 MeV/u in a hydrogen plasma has been measured. A 20 cm longz-pinch has been used as plasma target. Our data show a strong enhancement of the stopping power of the plasma compared to that of a cold gas with equal density. The results completely confirm the predictions of the standard stopping power model. 相似文献
36.
E. Cherbuliez Pl. Plattner S. Ariel R. Wahl Muhlemann E. Abderhalden P. Karrer W. Karrer H. Thomann E. Horlacher W. Mäder S. L. Jodidi V. Henriques S. P. L. Sörensen J. Tillmans P. Hirsch F. Stoppel L. Michaelis H. Bauer E. Strauss C. J. Weber J. Froideveaux 《Analytical and bioanalytical chemistry》1932,87(3-4):142-147
37.
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39.
Martin Wahl 《Mathematische Zeitschrift》2014,276(3-4):635-654
We prove mod-Gaussian convergence for a Dirichlet polynomial which approximates ${\mathrm{Im }}\log \zeta (1/2+it)$ . This Dirichlet polynomial is sufficiently long to deduce Selberg’s central limit theorem with an explicit error term. Moreover, assuming the Riemann hypothesis, we apply the theory of the Riemann zeta-function to extend this mod-Gaussian convergence to the complex plane. From this we obtain that ${\mathrm{Im }}\log \zeta (1/2+it)$ satisfies a large deviation principle on the critical line. Results about the moments of the Riemann zeta-function follow. 相似文献
40.
Wahl Pierre Ly-Gagnon Dany-Sebastien Debaes Christof Miller David A. B. Thienpont Hugo 《Optical and Quantum Electronics》2012,44(3-5):285-290
Numerical calculations with finite-difference time-domain (FDTD) on metallic nanostructures in a broad optical spectrum require an accurate approximation of the permittivity of dispersive materials. In this paper, we present the algorithms behind B-CALM (Belgium-California Light Machine), an open-source 3D-FDTD solver operating on Graphical Processing Units with multi-pole dispersion models. Our modified architecture shows a reduction in computing times for multi-pole dispersion models. We benchmark B-CALM by computing the absorption efficiency of a metallic nanosphere on a broad spectral range with a six-poles Drude-Lorentz model and compare it with Mie theory.
相似文献