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21.
R. Billerey C. Cerruti A. Chevarier N. Chevarier B. Cheynis A. Demeyer 《Zeitschrift für Physik A Hadrons and Nuclei》1979,292(3):293-299
Angular correlations between charged reaction products have been measured for the reaction14N+27A1 at 70 and 100 MeV. Light particle evaporation from the heavy recoil is shown to be the dominant process. In addition, however fast alphas are observed for all reaction channels. From the three-body kinematics we conclude that these alphas are emitted from the contact zone between the two heavy ions. A comparison of the results forE Lab=70 and 100 MeV excludes an explanation of this process by the recently suggested “Piston” or “hot-spot” models. 相似文献
22.
A. J. Cole A. Chabane M. Charvet P. Désesquelles A. Giorni D. Heuer A. Lleres J. B. Viano D. Benchekroun B. Cheynis A. Demeyer E. Gerlic D. Guinet M. Stern L. Vagneron 《Zeitschrift für Physik A Hadrons and Nuclei》1986,356(2):171-181
We apply the Boltzmann distribution to charge partition probabilities measured with the AMPHORA multidetector in the reaction 32S + 27Al at 37.5 MeV/ nucleon. Approximate corrections to the data for pre-equilibrium emission are made and modifications to the basic formalism due to detection e?ciency and evaporation are treated explicitly. The data are well reproduced with a temperature of 5.0 MeV and a freeze-out volume which corresponds to densities which are 20 times smaller than normal density. 相似文献
23.
In this study a double-bead sandwich assay, employing magnetic nanoparticles and gold nanoparticles is proposed. The magnetic nanoparticles allow specific capturing of the analyte in biological samples, while the optical properties of the gold nanoparticles provide the signal transduction. We demonstrated that a major improvement in the assay sensitivity was obtained by selecting an optimal gold nanoparticle size (60 nm). A detection limit of 5-8 ng/mL, a sensitivity of 0.6-0.8 (pg/mL)−1 and a dynamic range of 3 orders of magnitude were achieved without any further amplification using the detection of prostate specific antigen in serum as a model system. The proposed assay has the ability to be easily implemented within a microfluidic device for point-of-care applications whereby the readout can be executed by a fast and cheap optical measurement. 相似文献
24.
We investigate nonlinear oscillations in a fourth-order partialdifferential equation which models a suspension bridge. Previouswork establishes multiple periodic solutions when a parameterexceeds a certain eigenvalue. In this paper, we use Leray-Schauderdegree theory to prove that if the parameter is increased further,beyond a second eigenvalue, then additional solutions are created. 相似文献
25.
R. Płaneta W. Gawlikowicz A. Wieloch J. Brzychczyk T. Ciszek A.J. Cole P. Désesquelles K. Grotowski P. Hachaj S. Micek P. Pawłowski Z. Sosin D. Benchekroun E. Bisquer A. Chabane M. Charvet B. Cheynis A. Demeyer E. Gerlic A. Giorni D. Guinet D. Heuer P. Lautesse L. Lebreton A. Lléres M. Stern L. Vagneron J.B. Viano 《The European Physical Journal A - Hadrons and Nuclei》2001,11(3):297-304
The creation of hot Ca-like fragments was investigated in the 40Ca + 40Ca reaction at 35 AMeV. Using the AMPHORA 4π detector system, the primary projectile-like fragment was reconstructed and its
properties were determined. Both primary and secondary distributions are compared with the predictions of a Monte Carlo code
describing a heavy-ion collision as a two-step process. Some of the nucleons which are identified as participants in the first
step are transferred in the second step to these final states, which correspond on the average to the maximum value of entropy
(thermodynamic probability). The model allows for competition between mean-field effects and nucleon-nucleon interactions
in the overlap zone of the interacting nuclei. The analysis presented here suggests a thermalized source picture of the decay
of the projectile-like fragment. The validity of the reconstruction procedure for projectile-like fragments is discussed.
Received: 12 March 2001 / Accepted: 20 June 2001 相似文献
26.
R. Billerey C. Cerniti A. Chevarier N. Chevarier B. Cheynis A. Demeyer O. Zohni 《Zeitschrift für Physik A Hadrons and Nuclei》1980,297(4):317-321
Extensive analysis of the energy dissipation and nucleon exchange has been done with heavier systems. Here we choose the two light systems40Ar+27Al (E lab=340 MeV) and14N+27Al (E lab=100 MeV) in order to study the correlation of the energy dissipation with the variance of the charge distributions as a function of total kinetic energy loss bins. Considerable energy damping is found to occur in the approach phase which cannot be explained by a simple Fokker-Planck diffusion model. Indeed a model which interprets the collision as a local equilibration followed by diffusive phenomena is more appropriate to fit the data. 相似文献
27.
We prove that a relation over is recursively enumerable if and only if it is Diophantine over . We do this by first constructing a model of in , where n is represented by Zn. In a second step, we show that it suffices to eliminate a bounded universal quantifier. Then finally, the hardest part of the proof is to show that we can eliminate this quantifier. 相似文献
28.
Sofie Demeyer Jan Goedgebeur Pieter Audenaert Mario Pickavet Piet Demeester 《4OR: A Quarterly Journal of Operations Research》2013,11(4):323-348
The latest transportation systems require the best routes in a large network with respect to multiple objectives simultaneously to be calculated in a very short time. The label setting algorithm of Martins efficiently finds this set of Pareto optimal paths, but sometimes tends to be slow, especially for large networks such as transportation networks. In this article we investigate a number of speedup measures, resulting in new algorithms. It is shown that the calculation time to find the Pareto optimal set can be reduced considerably. Moreover, it is mathematically proven that these algorithms still produce the Pareto optimal set of paths. 相似文献
29.
30.
A. J. Cole A. Chabane M. Charvet P. Désesquelles A. Giorni D. Heuer A. Lleres J. B. Viano D. Benchekroun B. Cheynis A. Demeyer E. Gerlic D. Guinet M. Stern L. Vagneron 《Zeitschrift für Physik A Hadrons and Nuclei》1996,356(1):171-181
We apply the Boltzmann distribution to charge partition probabilities measured with the AMPHORA multidetector in the reaction32S+27Al at 37.5 MeV/nucleon. Approximate corrections to the data for preequilibrium emission are made and modifications to the basic formalism due to detection efficiency and evaporation are treated explicitly. The data are well reproduced with a temperature of 5.0 MeV and a freeze-out volume which corresponds to densities which are 20 times smaller than normal density. 相似文献