We demonstrate that two identical chaotic systems of a conservative map can be synchronized by applying periodic pulses at regular time intervals. This idea is illustrated with a two-dimensional standard map. The mech...
We demonstrate that two identical chaotic systems of a conservative map can be synchronized by applying periodic pulses at regular time intervals. This idea is illustrated with a two-dimensional standard map. The mechanism is also studied.
We present a detailed Monte Carlo evaluation of the equilibrium distribution of local spin-flip rates and local energies in the paramagnetic phase of the d=2 and d=3±J Ising spin glass. Both quantities are spatia...
We present a detailed Monte Carlo evaluation of the equilibrium distribution of local spin-flip rates and local energies in the paramagnetic phase of the d=2 and d=3±J Ising spin glass. Both quantities are spatially heterogeneous, and we find that the shapes of the distributions change dramatically with decreasing temperature. In particular as temperature decreases we find that for an increasing fraction of spins the local spin-flip rate and local energy increase as the glass transition is approached.
B. D. Coller, P. Holmes, John Lumley; Erratum: ‘‘Interaction of adjacent bursts in the wall region’’ [Phys. Fluids 6, 954 (1994)], physics of Fluids, Volume 9,
B. D. Coller, P. Holmes, John Lumley; Erratum: ‘‘Interaction of adjacent bursts in the wall region’’ [Phys. Fluids 6, 954 (1994)], physics of Fluids, Volume 9,
In an era of fiscal austerity, downsizing and unforgiving pressure upon human and economic capital, it is an Augean task to identify resources for fresh and creative work. The realities of the day and the practical de...
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In an era of fiscal austerity, downsizing and unforgiving pressure upon human and economic capital, it is an Augean task to identify resources for fresh and creative work. The realities of the day and the practical demands of more immediate fleet needs can often dictate higher priorities. Yet, the Navy must avoid eating its seed corn. Exercising both technical insight and management foresight, the fleet, the R&D community, the Office of the Chief of Naval Operations (OpNav) and the product engineering expertise of the Naval Surface Warfare Center (NSWC) are joined and underway with integrated efforts to marry new, fully demonstrated technologies and operational urgencies. Defense funding today cannot sponsor all work that can be mission-justified over the long term because budgets are insufficient to support product maturation within the classical development cycle. However, by rigorous technical filtering and astute engineering of both marketplace capabilities and currently available components, it is possible in a few select cases to compress and, in effect, integrate advanced development (6.3), engineering development (6.4), weapon procurement (WPN), ship construction (SCN), operation and maintenance (O&M,N) budgetary categories when fleet criticalities and technology opportunities can happily meet. In short, 6.3 funds can be applied directly to ''ripe gateways'' so modern technology is inserted into existing troubled or aging systems, sidestepping the lengthy, traditional development cycle and accelerating practical payoffs to recurrent fleet problems. To produce such constructive results has required a remarkable convergence of sponsor prescience and engineering workforce excellence. The paper describes, extensively, the philosophy of approach, transition strategy, polling of fleet needs, technology assessment, and management team requirements. The process for culling and selecting specific candidate tasks for SHARP sponsorship (matching operational need with t
We show that the statistical properties of the large scales of the Kuramoto-Sivashinsky equation in the extended system limit can be understood in terms of the dynamical behavior of the same equation in a small finite...
A local alternating segment explicit - implicit method for the solution of 2D diffusion equations is presented in this paper .The method is unconditionally stable and has the obvious property of parallelism. Some nume...
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A local alternating segment explicit - implicit method for the solution of 2D diffusion equations is presented in this paper .The method is unconditionally stable and has the obvious property of parallelism. Some numerical experiments show the method is not only simple but also more accurate.
We present total cross sections in the laboratory energy range 17.5-500 keV amu(-1) for electron capture by protons in collision with He+(1s). We describe this process theoretically by performing a close-coupling (CC)...
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We present total cross sections in the laboratory energy range 17.5-500 keV amu(-1) for electron capture by protons in collision with He+(1s). We describe this process theoretically by performing a close-coupling (CC) calculation using the symmetrized variational (SV) continuum distorted-wave (CDW) collision ansatz. We discuss the SVCDW results in conjunction with another CC variational CDW calculation, with CDW perturbation theory, and also with close-coupling calculations which involve a representation of the continuum by a set of pseudo-states which may include pseudo-states of the united atom. Moreover, we compare the SVCDW results with the available experimental data. The SVCDW results are found to be in very good agreement with the experiments of Peart et al, Rinn et al and Watts et al at all energies, and consequently to be at variance with the experimental results of Angel et al. The SVCDW results are also found to be in good accord with a CC calculation involving Sturmian-type pseudo-states. We investigate this agreement further by comparing impact-parameter profiles at 50 and 17.5 keV amu(-1).
We present total cross sections in the energy range 7-1000 keV amu(-1) for electron capture by alpha-particles in collision with atomic hydrogen in the ground state. We describe this process theoretically by performin...
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We present total cross sections in the energy range 7-1000 keV amu(-1) for electron capture by alpha-particles in collision with atomic hydrogen in the ground state. We describe this process theoretically by performing a close-coupling calculation using the symmetrized variational (SV) continuum distorted-wave (CDW) collision ansatz. SVCDW views the collision in a unique way by including both incoming and outgoing CDWs in the wavefunctions at all finite times, while simultaneously guaranteeing the correct coulombic asymptotes. We compare the SVCDW results with the available experimental data, with a dose-coupling calculation in which outgoing CDWs only are used to describe the collision, and with CDW perturbation theory. At high energies the three theoretical curves converge, while at lower energies the SVCDW results are shown to reproduce experiments more accurately. We also compare the SVCDW results with other coupled-channel calculations which use pseudo-states to describe the interaction of the target and the projectile with the continuum.
We present the first results of an ab initio coupled-channel calculation of electron capture to the n=2 states of hydrogen in proton-hydrogen collisions using symmetrized variational (SV) continuum distorted-wave (CDW...
We present the first results of an ab initio coupled-channel calculation of electron capture to the n=2 states of hydrogen in proton-hydrogen collisions using symmetrized variational (SV) continuum distorted-wave (CDW) theory. In SVCDW theory the collision ansatz includes both outgoing- and incoming-wave components in the wave functions, and represents in a compact and elegant form a very complete basis set for describing the electron capture process. We calculate total cross sections for nonresonant capture to the 2s and 2p states of the projectile, in the energy range 7–150 keV. The results are a substantial improvement over a previous variational CDW theory, and in particular are found to be in good accord with the available experimental data.
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