| 1. |
- Abdullaev, Fatkhulla, et al.
(författare)
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Matter waves in atomic-molecular condensates with Feshbach resonance management
- 2021
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - : American Physical Society. - 1063-651X .- 1095-3787. ; 104:2
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Tidskriftsartikel (refereegranskat)abstract
- The dynamics of matter waves in the atomic to molecular condensate transition with a time-modulated atomic scattering length is investigated. Both the cases of rapid and slow modulations are studied. In the case of rapid modulations, the average over oscillations for the system is derived. The corresponding conditions for dynamical suppression of the association of atoms into the molecular field, or of second-harmonic generation in nonlinear optical systems, are obtained. For the case of slow modulations, we find resonant enhancement in the molecular field. We then illustrate chaos in the atomic-molecular BEC system. We suggest a sequential application of the two types of modulations, slow and rapid, when producing molecules.
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| 2. |
- Ahuja, R, et al.
(författare)
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Melting and liquid structure of aluminum oxide using a molecular-dynamics simulation
- 1998
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Ingår i: PHYSICAL REVIEW E. - : AMERICAN PHYSICAL SOC. - 1063-651X. ; 57:2, s. 1673-1676
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The radial distribution function G(r) for liquid aluminum oxide (corundum) is calculated by means of the two-phase molecular-dynamics method utilizing a previously developed pairwise interatomic potential. Our results agree very well with the recent exper
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| 3. |
- Alegret, Joan, et al.
(författare)
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Top-down extended meshing algorithm and its applications to Green's tensor nano-optics calculations
- 2007
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - : The American Physical Society. - 1063-651X .- 1095-3787. ; 75:4
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Tidskriftsartikel (refereegranskat)abstract
- We present a computational algorithm which speeds up Green's tensor nano-optics calculations by means of optimizing the mesh that represents the system we want to investigate. The algorithm automates the process of creating a variable-size mesh that describes an arbitrary nanostructure. The total number of elements of this mesh is smaller than that of a regular mesh representing the same structure, and thus the Green's tensor calculations can be performed faster. Precision, however, is kept at a similar level than for the regular mesh. Typically, the algorithm yields a mesh that speeds up Green's tensor calculations by a factor of 4, while giving a maximum error in the field magnitude of about 5%. The speed-up factor makes it very suitable for otherwise lengthy calculations, and the error should be acceptable for most applications.
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| 4. |
- Alekseev, A, et al.
(författare)
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Stability of current filaments in a bistable semiconductor system with global coupling
- 1998
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Ingår i: PHYSICAL REVIEW E. - : AMERICAN PHYSICAL SOC. - 1063-651X. ; 57:3, s. 2640-2649
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We study the stability of steady current filaments in a bistable semiconductor system in the presence of global coupling given by an external circuit. The system is described by a reaction-diffusion model on a two-dimensional spatial domain with Neumann b
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| 5. |
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| 6. |
- Ardelius, John, et al.
(författare)
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Behavior of heuristics on large and hard satisfiability problems
- 2006
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - 1063-651X .- 1095-3787. ; 74:3, s. 037702-
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Tidskriftsartikel (refereegranskat)abstract
- We study the behavior of a heuristic for solving random satisfiability problems by stochastic local search near the satisfiability threshold. The heuristic for average satisfiability (ASAT), is similar to the Focused Metropolis Search heuristic, and shares the property of being focused, i.e., only variables in unsatisfied clauses are updated in each step. It is significantly simpler than the benchmark WALKSAT heuristic. We show that ASAT solves instances as large as N=10(6) in linear time, on average, up to a ratio of 4.21 clauses per variable in random three-satisfiability. For K higher than 3, ASAT appears to solve instances of K-satisfiability up to the Montanari-Ricci-Tersenghi-Parisi full replica symmetry breaking (FSRB) threshold denoted alpha(s)(K) in linear time.
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| 7. |
- Arteca, GA, et al.
(författare)
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Quantitative measure of folding in two-dimensional polymers
- 1999
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Ingår i: PHYSICAL REVIEW E. - : AMERICAN PHYSICAL SOC. - 1063-651X. ; 59:4, s. 4209-4215
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The degree of folding of a single three-dimensional (3D) polymer configuration is a general concept associated with the pattern of interpenetrations between chain loops. In the present context, this notion applies to the state of a rigid chain, regardless
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| 8. |
- Arteca, GA, et al.
(författare)
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Unfolded in vacuo lysozyme folds into native, quasinative, and compact structures
- 1999
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Ingår i: PHYSICAL REVIEW E. - : AMERICAN PHYSICAL SOC. - 1063-651X. ; 59:5, s. 5981-5986
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Tidskriftsartikel (refereegranskat)abstract
- We show that the relaxation dynamics of unfolded in vacuo lysozyme is not random. Analyses of molecular dynamics trajectories in a convenient space of molecular shape descriptors reveal a "favored" pattern of transitions leading to stable conformations. T
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| 9. |
- Aurell, Erik, et al.
(författare)
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Stability puzzles in phage lambda
- 2002
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - 1063-651X .- 1095-3787. ; 65:5
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Tidskriftsartikel (refereegranskat)abstract
- In the absence of RecA-mediated cleavage of the repressor, the X prophage is exceptionally stable. We. develop a stochastic model that predicts the stability of such epigenetic states from affinities of the molecular components. We find that the stability, in particular, depends on the maximum possible cI protein production. and on the number of translated cro proteins per transcribed mRNA. We apply the model to the behavior of recently published mutants of O-R and find, in particular, that a mutant that overexpress cro behaves in a different way than what was predicted, thus suggesting that the current view of the O-R switch is incomplete. The approach described here should be generally applicable to the stability of expressed states.
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| 10. |
- Baek, Seung Ki, 1979-, et al.
(författare)
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Comment on `Six-state clock model on the square lattice: Fisher zeroapproach with Wang-Landau sampling'
- 2010
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - 1063-651X .- 1095-3787. ; 81:6, s. 3101-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Hwang in [Phys. Rev. E {\bf{80}}, 042103 (2009)] suggested that the two transitions of the six-state clock model on the square lattice are\emph{not} of the Kosterlitz-Thouless type. Here we show from simulations thatat the upper transition, the helicity modulus does make a discontinuous jumpto zero. This gives strong evidence for a Kosterlitz-Thoulesstransition.
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