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21.
The main injector particle production (MIPP) experiment at Fermilab uses particle beams of charged pions, kaons, proton and antiproton with beam momenta of 5?C90 GeV/c to measure particle production cross-sections of various nuclei including liquid hydrogen, MINOS target and thin targets of beryllium, carbon, bismuth and uranium. The physics motivation to perform such cross-section measurements is described here. Recent results on the analysis of NuMI target and forward neutron cross-sections are presented here. Preliminary cross-section measurements for 58 GeV/c proton on liquid hydrogen target are also presented. A new method is described to correct for low multiplicity inefficiencies in the trigger using KNO scaling. 相似文献
22.
To understand the role of isospin effects on fragmentation due to the collisions of charge asymmetric nuclei, we have performed a complete systematical study using isospin-dependent quantum molecular dynamics model. Here simulations have been carried out for $^{124}{\rm X}_{n}+^{124}{\rm X}_{n}$ , where n varies from 47 to 59 and for $^{40}{\rm Y}_{m}+^{40}{\rm Y}_{m}$ , where m varies from 14 to 23. Our study shows that isospin-dependent cross-section shows its influence on fragmentation in the collision of neutron-rich nuclei. 相似文献
23.
NEERAJ KUMAR KAMAL 《Pramana》2012,78(5):705-718
We describe a simple model mimicking diffusively coupled chemical micro-oscillators. We characterize the rich variety of dynamical states emerging from the model under variation of time delay in coupling, coupling strength and boundary conditions. The spatiotemporal patterns obtained include clustering, mixed dynamics, inhomogeneous steady states and amplitude death. Further, under delay in coupling, the model yields transitions from phase to antiphase oscillations, reminiscent of that observed in experiments [M Toiya et al, J. Chem. Lett. 1, 1241 (2010)]. 相似文献
24.
The present note deals with the effects of radiative heat transfer and free convection in MHD for a flow of an electrically
conducting, incompressible, dusty viscous fluid past an impulsively started vertical non-conducting plate, under the influence
of transversely applied magnetic field. The heat due to viscous dissipation and induced magnetic field is assumed to be negligible.
The governing linear partial differential equations are solved by finite difference technique. The effects of various parameters
(like radiation parameter N, Prandtl number Pr, porosity parameter K) entering into the MHD Stokes problem for flow of dusty conducting fluid have been examined on the temperature field and
velocity profile for both the dusty fluid and dust particles. 相似文献
25.
An Rm-valued sequence (xk): = (xk : k = 1, 2, ...), e.g. generatedrecursively by xk = fk (xkk, Uk), is called averagepth power bounded if (1/K) is bounded uniformly in K= 1, 2,.... (The case p = 2 may correspond to powerin the physical sense.) This is a notion of stability. Givenestimates of the form: fk (x, u) < a x + ¶ k conditionsare obtained on the coefficient sequence (ak) and the inputestimates ek:=¶k (uk) which ensure this form of stabilityfor the output (xk). In particular, a condition (utilized inan application to adaptive control) is obtained which imposes(i) a bound b on (ak) and a sparsity measure m(K) on #{kK: ak>} as K ( >1) (ii) average pth power boundednesson (ek), and (iii) a growth condition on (ek) related to b andm (). This condition is sharp. 相似文献
26.
The strength and stability properties of hierarchical load-bearing networks and their strengthened variants have been discussed
in a recent work. Here, we study the avalanche time distributions on these load-bearing networks. The avalanche time distributions
of the V-lattice, a unique realization of the networks, show power-law behaviour when tested with certain fractions of its
trunk weights. All other avalanche distributions show Gaussian peaked behaviour. Thus the V-lattice is the critical case of
the network. We discuss the implications of this result. 相似文献
27.
In the present paper we consider a class of entire functions represented by Dirichlet series whose coefficients belong to a commutative Banach algebra and prove it to be a complex FK-space and a Frechet space. 相似文献
28.
29.
The paper deals with growth estimates and approximation (not necessarily entire) of solutions of certain elliptic partial differential equations. These solutions are called generalized bi-axially symmetric potentials (GBASP's). To obtain more refined measure of growth, we have defined $q$-proximate order and obtained the characterization of generalized $q$-type and generalized lower $q$-type with respect to $q$-proximate order of a GBASP in terms of approximation errors and ratio of these errors in sup norm. 相似文献
30.
In this paper,we proposed an innovation diffusion model with three compartments to investigate the diffusion of an innovation(product) in a particular region.The model exhibits two equilibria,namely,the adopter-free and an interior equilibrium.The existence and local stability of the adopter-free and interior equilibria are explored in terms of the effective Basic Influence Number(BIN) RA.It is investigated that the adopter free steady-state is stable if RA <1.By conside... 相似文献