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Andreas Guthmann 《BIT Numerical Mathematics》1992,32(3):529-534
Using third roots of unity Proth's theorem for primality testing is generalized to integers of the formN=k3
n
+1, avoiding the use of Lucas sequences which are more suitable ifN+1 is factored instead ofN–1. This approach has the advantage of being easily combined with Proth's test and gives polynomial time algorithms for testing integers of the formN=k2
m
3
n
+1. 相似文献
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Andreas Guthmann 《Archiv der Mathematik》1992,59(4):334-340
Ohne Zusammenfassung 相似文献
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H. Lambaré P. Roche S. Balibar H.J. Maris O.A. Andreeva C. Guthmann K.O. Keshishev E. Rolley 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,2(3):381-391
We have studied the nucleation of bubbles in pure superfluid helium-4 at temperatures down to 65 mK. We have found that the
nucleation is a stochastic process, and that at temperatures below 600 mK the nucleation rate is independent of temperature.
These results are consistent with the assumption that the nucleation takes place via quantum tunneling.
Received: 15 November 1997 / Received in final form: 19 December 1997 / Accepted: 22 January 1998 相似文献
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S. Hudlet M. Saint Jean C. Guthmann J. Berger 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,2(1):5-10
We propose a very simple method to determine the electrical tip-surface force in Atomic Force Microscopes used to study the
electrical properties of metallic or insulating materials; the analysis of the measurements as well as determination of the
appropriate experimental procedures requiring an analytical model of the tip-surface capacitance. The comparison of force
expressions obtained by this method with those obtained by exact derivation in the case of the sphere-infinite plane system
shows very good agreement. This method is then applied to determine the tip-surface force, the real shape of the tip being
introduced in the derivation. The obtained expression is compared to experimental and numerical data. We emphasize that this
method is very general and can be applied to any axially symmetric capacitor.
Received: 17 June 1997 / Received: 16 September 1997 / Accepted: 7 November 1997 相似文献
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We have compared the surface properties of crystals respectively grown from normal 4He containing 130 ppb of 3He and from ultrapure 4He (0.4 ppb). Below 0.4 K, 3He impurities are found to decrease both the surface tension and the step energy. Our results are consistent with the existence of two-dimensional bound states for 3He atoms at the solid-liquid interface. Quantitative agreement with the data is found with a binding energy s ≈ 4.3 K and a 3He density saturating around 0.4 monolayer. The presence of steps is found to increase the binding energy by about 10 mK. 相似文献
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The modulation of delayed fluorescence in 1,4-dibromonaphthalene by magnetic fields has been studied at room temperature. The analysis of high field resonance positions shows that, besides annihilation of triplet excitons in the same one-dimensional stack, annihiliation also occurs between triplets localized on different, neighbouring stacks, in particular those corresponding to the two molecules of the asymmetric pair. 相似文献