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  • 1
    Digitale Medien
    Digitale Medien
    Exact ground states of Ising spin glasses: New experimental results with a branch-and-cut algorithm (1995)
    Springer
    Journal of statistical physics 80 (1995), S. 487-496 
    Details
    ISSN: 1572-9613
    Schlagwort(e): Branch and cut ; Ising spin glasses ; exact ground states
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In this paper we study two-dimensional Ising spin glasses on a grid with nearest neighbor and periodic boundary interactions, based on a Gaussian bond distribution, and an exterior magnetic field. We show how using a technique called branch and cut, the exact ground states of grids of sizes up to 100×100 can be determined in a moderate amount of computation time, and we report on extensive computational tests. With our method we produce results based on more than 20,000 experiments on the properties of spin glasses whose errors depend only on the assumptions on the model and not on the computational process. This feature is a clear advantage of the method over other, more popular ways to compute the ground state, like Monte Carlo simulation including simulated annealing, evolutionary, and genetic algorithms, that provide only approximate ground states with a degree of accuracy that cannot be determineda priori. Our ground-state energy estimation at zero field is −1.317.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02178370
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  • 2
    Digitale Medien
    Digitale Medien
    Exact ground states of two-dimensional ±J Ising spin glasses (1996)
    Springer
    Journal of statistical physics 84 (1996), S. 1363-1371 
    Details
    ISSN: 1572-9613
    Schlagwort(e): Branch and cut ; Ising spin glasses ; exact ground states
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In this paper we study the problem of finding an exact ground state of a two-dimensional ±J Ising spin glass on a square lattice with nearest neighbor interactions and periodic boundary conditions when there is a concentrationp of negative bonds, withp ranging between 0.1 and 0.9. With our exact algorithm we can determine ground states of grids of sizes up to 50×50 in a moderate amount of computation time (up to 1 hr each) for several values ofp. For the ground-state energy of an infinite spin-glass system withp=0.5 we estimateE 0.5 ∞ =−1.4015±0.0008. We report on extensive computational tests based on more than 22,000 experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02174135
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  • 3
    Digitale Medien
    Digitale Medien
    Multicentre comparison of the antihypertensive effect of acebutolol and hydrochlorothiazide in uncomplicated mild-moderate hypertension in the elderly (1985)
    Springer
    European journal of clinical pharmacology 29 (1985), S. 275-279 
    Details
    ISSN: 1432-1041
    Schlagwort(e): hypertension ; acebutolol ; hydrochlorothiazide ; elderly ; cross-over trial ; blood pressure reduction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary To evaluate the efficacy of acebutolol, 400–600 mg/day in elderly hypertensive patients, and to compare it with hydrochlorothiazide 25–50 mg/day, 45 patients with mild-moderate uncomplicated hypertension were treated for 6 weeks in a multicentre, single-blind, randomized, crossover trial. Acebutolol decreased supine systolic blood pressure from 186.5 to 162.7 mmHg and diastolic blood pressure from 107.4 to 92.4 mmHg. Hydrochlorothiazide decreased systolic blood pressure from 185.0 to 166.4 and diastolic blood pressure from 107.2 to 96.4. There was no difference between the effects of acebutolol and hydrochlorothiazide on blood pressure during the trial. Both drugs proved to be safe and effective antihypertensive agents, provided the major contraindications for their use were taken into account. Beta-blockade by acebutolol was highly effective in treating mild-moderate arterial hypertension in the elderly.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00544080
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