595 research outputs found
Experimental Investigation of Supplier-Retailer Contracts: The Wholesale Price Contract
We examine decision making in a simple supplier-retailer wholesale price contract in the experimental economics laboratory. We observe wholesale prices and order quantities below the game-theoretical predictions. The supply chain’s efficiency is as predicted but profits are more equitably allocated. Cette étude en économie expérimentale examine les contrats de prix en gros négociés entre un détaillant et un vendeur. Nous observons que les prix et les quantités négociés sont en dessous des prévisions tirées du modèle retenue en théorie des jeux. Les résultats expérimentaux indiquent que l’efficacité de la chaîne d’approvisionnement est inférieur à 100 % tel que prédit par le modèle. Par ailleurs, les profits sont alloués de façon plus équitable que l’allocation prédite par le modèle.supply chain coordination, industrial organization, experimental economics, coordination dans la chaîne d’approvisionnement, organisation industrielle, économie expérimentale
Microscopic study of CaCa fusion
We investigate the fusion barriers for reactions involving Ca isotopes
, , and
using the microscopic time-dependent
Hartree-Fock theory coupled with a density constraint. In this formalism the
fusion barriers are directly obtained from TDHF dynamics. We also study the
excitation of the pre-equilibrium GDR for the
system and the associated -ray
emission spectrum. Fusion cross-sections are calculated using the incoming-wave
boundary condition approach. We examine the dependence of fusion barriers on
collision energy as well as on the different parametrizations of the Skyrme
interaction.Comment: 11 pages, 13 figure
Microscopic Calculation of Fusion: Light to Heavy Systems
The density-constrained time-dependent Hartree-Fock (DC-TDHF) theory is a
fully microscopic approach for calculating heavy-ion interaction potentials and
fusion cross sections below and above the fusion barrier. We discuss recent
applications of DC-TDHF method to fusion of light and heavy neutron-rich
systems.Comment: 8 pages, 8 figure
Fusion using time-dependent density-constrained DFT
We present results for calculating fusion cross-sections using a new
microscopic approach based on a time-dependent density-constrained DFT
calculations. The theory is implemented by using densities and other
information obtained from TDDFT time-evolution of the nuclear system as
constraint on the density for DFT calculations.Comment: 4 Pages, 6 Figures Proceedings of INPC 2013, to be published in EPJ
Web of Conference
Microscopic DC-TDHF study of heavy-ion potentials and fusion cross sections
We study heavy-ion fusion reactions at energies near the Coulomb barrier, in
particular with neutron-rich radioactive ion beams. Dynamic microscopic
calculations are carried out on a three-dimensional lattice using the
Density-Constrained Time-Dependent Hartree-Fock (DC-TDHF) method. New results
are presented for the Sn+Ca system which are compared to
Sn+Ca studied earlier. Our theoretical fusion cross-sections
agree surprisingly well with recent data measured at HRIBF. We also study the
near- and sub-barrier fusion of O on C which is important to
determine the composition and heating of the crust of accreting neutron stars.Comment: Talk given by . Volker E. Oberacker at the 11th International
Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA,
May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of
Physics: Conference Series (JPCS
Heating of Micro-protrusions in Accelerating Structures
The thermal and field emission of electrons from protrusions on metal
surfaces is a possible limiting factor on the performance and operation of
high-gradient room temperature accelerator structures. We present here the
results of extensive numerical simulations of electrical and thermal behavior
of protrusions. We unify the thermal and field emission in the same numerical
framework, describe bounds for the emission current and geometric enhancement,
then we calculate the Nottingham and Joule heating terms and solve the heat
equation to characterize the thermal evolution of emitters under RF electric
field. Our findings suggest that, heating is entirely due to the Nottingham
effect, that thermal runaway scenarios are not likely, and that high RF
frequency causes smaller swings in temperature and cooler tips. We build a
phenomenological model to account for the effect of space charge and show that
space charge eliminates the possibility of tip melting, although near melting
temperatures reached.Comment: 8 pages, 10 figure
Dynamic Microscopic Theory of Fusion Using DC-TDHF
The density-constrained time-dependent Hartree-Fock (DC-TDHF) theory is a
fully microscopic approach for calculating heavy-ion interaction potentials and
fusion cross sections below and above the fusion barrier. We discuss recent
applications of DC-TDHF method to fusion of light and heavy systems.Comment: Proceedings for the talk presented by A.S. Umar at the Nuclear
Structure and Dynamics II, Opatija, Croatia, July 9-13, 201
Budget Processes: Theory and Experimental Evidence
This paper studies budget processes, both theoretically and experimentally. We compare the outcomes of bottom-up and top-down budget processes. It is often presumed that a top-down budget process leads to a smaller overall budget than a bottom-up budget process. Ferejohn and Krehbiel (1987) showed theoretically that this need not be the case. We test experimentally the theoretical predictions of their work. The evidence from these experiments lends strong support to their theory, both at the aggregate and the individual subject level
PTPN22 gene polymorphism in Takayasu's arteritis
Objective. Takayasu's arteritis (TA) is a chronic, rare granulomatous panarteritis of unknown aetiology involving mainly the aorta and its major branches. In this study, genetic susceptibility to TA has been investigated by screening the functional single nucleotide polymorphism (SNP) of PTPN22 gene encoding the lymphoid-specific protein tyrosine phosphatase. Methods. Totally, 181 patients with TA and 177 healthy controls are genotyped by PCR-RFLP method for the SNP rs2476601 (A/G) of PTPN22 gene. Polymorphic region was amplified by PCR and digested with Xcm I enzyme. Results. Detected frequencies of heterozygous genotype (AG) were 5.1% (9/177) in control group and 3.8% (7/181) in TA group (P = 0.61, odds ratio: 0.75, 95% CI: 0.3, 2.0). No association with angiographic type, vascular involvement or prognosis of TA was observed either. Conclusion. The distribution of PTPN22 polymorphism did not reveal any association with TA in Turkey. © The Author 2008. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved
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