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排序方式: 共有146条查询结果,搜索用时 125 毫秒
91.
Nikky Kortbeek Aleida Braaksma Ferry HF Smeenk Piet JM Bakker Richard J Boucherie 《The Journal of the Operational Research Society》2015,66(7):1061-1076
The design and operations of inpatient care facilities are typically largely historically shaped. A better match with the changing environment is often possible, and even inevitable due to the pressure on hospital budgets. Effectively organizing inpatient care requires simultaneous consideration of several interrelated planning issues. Also, coordination with upstream departments like the operating theatre and the emergency department is much-needed. We present a generic analytical approach to predict bed census on nursing wards by hour, as a function of the Master Surgical Schedule and arrival patterns of emergency patients. Along these predictions, insight is gained on the impact of strategic (ie, case mix, care unit size, care unit partitioning), tactical (ie, allocation of operating room time, misplacement rules), and operational decisions (ie, time of admission/discharge). The method is used in the Academic Medical Center Amsterdam as a decision-support tool in a complete redesign of the inpatient care operations. 相似文献
92.
E. Scalas U. Garibaldi S. Donadio 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,53(2):267-272
Simple stochastic exchange games are based on random allocation of finite
resources. These games are Markov chains that can be studied
either analytically or by Monte Carlo simulations.
In particular, the equilibrium distribution can be derived either by
direct diagonalization of the transition matrix, or using the detailed
balance equation, or by Monte Carlo estimates. In this paper, these
methods are introduced and applied to the Bennati-Dragulescu-Yakovenko (BDY) game.
The exact analysis shows that the statistical-mechanical analogies
used in the previous literature have to be revised.
An erratum to this article is available at . 相似文献
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98.
P. Barreau M. Bernheim J. Duclos J.M. Finn Z. Meziani J. Morgenstern J. Mougey D. Royer B. Saghai D. Tarnowski S. Turck-Chieze M. Brussel G.P. Capitani E. De Sanctis S. Frullani F. Garibaldi D.B. Isabelle E. Jans P.D. Zimmerman 《Nuclear Physics A》1983,402(3):515-540
We have measured the deep-inelastic electron scattering from carbon up to and including the Δ-region at 36°, 60°, 90° and 145°. The systematic decomposition of the transverse and longitudinal response functions has been obtained by means of a Rosenbluth-type analysis of the data in the momentum transfer interval 200 MeV/c /s |q| /s 600 MeV/c. A comparison with theoretical calculations which extend over the quasielastic and Δ-peak regions is presented. A reduction of the differences between our data and theory seems obtainable through the introduction of meson-exchange currents, resonant and non-resonant meson production, and the use of the shell model. Our experimental Coulomb sum-rule estimates at higher agree with independent particle model predictions. We compare our results in the vicinity of the Δ-peak with the total absorption cross section for real photons. 相似文献
99.
Airapetian A Akopov N Akopov Z Amarian M Ammosov VV Andrus A Aschenauer EC Augustyniak W Avakian R Avetissian A Avetissian E Bailey P Baturin V Baumgarten C Beckmann M Belostotski S Bernreuther S Bianchi N Blok HP Böttcher H Borissov A Bouwhuis M Brack J Brüll A Bryzgalov V Capitani GP Chiang HC Ciullo G Contalbrigo M Dalpiaz PF De Leo R De Nardo L De Sanctis E Devitsin E Di Nezza P Düren M Ehrenfried M Elalaoui-Moulay A Elbakian G Ellinghaus F Elschenbroich U Ely J Fabbri R Fantoni A 《Physical review letters》2004,92(1):012005
Double-spin asymmetries of semiinclusive cross sections for the production of identified pions and kaons have been measured in deep inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with reanalyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data. 相似文献
100.
Amarian M Auerbach L Averett T Berthot J Bertin P Bertozzi B Black T Brash E Brown D Burtin E Calarco J Cates G Chai Z Chen JP Choi S Chudakov E Cisbani E De Jager CW Deur A DiSalvo R Dieterich S Djawotho P Finn M Fissum K Fonvieille H Frullani S Gao H Gao J Garibaldi F Gasparian A Gilad S Gilman R Glamazdin A Glashausser C Goldberg E Gomez J Gorbenko V Hansen JO Hersman B Holmes R Huber GM Hughes E Humensky B Incerti S Iodice M Jensen S Jiang X Jones C Jones G Jones M Jutier C Ketikyan A 《Physical review letters》2004,92(2):022301
We have measured the spin structure functions g(1) and g(2) of 3He in a double-spin experiment by inclusively scattering polarized electrons at energies ranging from 0.862 to 5.058 GeV off a polarized 3He target at a 15.5 degrees scattering angle. Excitation energies covered the resonance and the onset of the deep inelastic regions. We have determined for the first time the Q2 evolution of Gamma(1)(Q2)= integral (1)(0)g(1)(x,Q2)dx, Gamma(2)(Q2)= integral (1)(0)g(2)(x,Q2)dx, and d(2)(Q2)= integral (1)(0)x(2)[2g(1)(x,Q2)+3g(2)(x,Q2)]dx for the neutron in the range 0.1< or =Q2< or =0.9 GeV2 with good precision. Gamma(1)(Q2) displays a smooth variation from high to low Q2. The Burkhardt-Cottingham sum rule holds within uncertainties and d(2) is nonzero over the measured range. 相似文献