Results 1 - 10 of 14158
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[en] The other form of fractional oscillator equation comparing to the widely discussed one is ushered in. The properties of vibration of two fractional oscillators are discussed under the influence of different initial conditions. The interpretation of the characteristics of the fractional oscillators using different method is illustrated. Based on two fractional oscillator equations, two linked bodies and the continuous system are studied.
[en] A system using a Josephson series array capable of developing voltages of up to 1.3 V is described. The array system has been compared to Volt NRC with good agreement. At 1.018 V, the difference between the array system and VNRC which is referenced to an existing single junction system is 0.008 +- 0.035 μV
[en] We have made measurements of the proton spin relaxation dispersion, in the isotropic phase of MBBA and EBBA, over a more extended Larmor frequency range than previous workers. The data are discussed in terms of order fluctuations, self-diffusion and rotational motion by means of computer model fittings. Correlation times obtained in this way do not show full agreement with the results of other spectroscopic techniques and previous NMR studies
[en] We discuss how the presence of environmental effects and quasiparticle agglomerates could better reconcile the edge states theories with the experimental observations for the case of ν = 5/2. The Pfaffian and the anti-Pfaffian models will be compared in connection with experimental results identifying the latter as the best candidate
[en] The most recent improvement in the 10 V array system was carried out with focusing on noise reduction. We have evaluated the uncertainty of the 10 V Josephson array system after the improvement. The uncertainty evaluation of 10 V standard included a comparison with a programmable Josephson array system at 1 V. Every contribution to the measurement uncertainty was evaluated in the level of 10-10. The estimated combined uncertainty was found to be approximately 10-9 at 10 V, which was limited only by the indirect verifying method. In the near future, a direct comparison with another 10 V Josephson voltage standard is expected to be carried out to provide more accurate uncertainty evaluation for the KRISS Josephson voltage standard.
[en] We report the diffusion coefficient and viscosity of popular rigid water models: two non-polarizable ones (SPC/E with three sites, and TIP4P/2005 with four sites) and a polarizable one (Dang-Chang, four sites). We exploit the dependence of the diffusion coefficient on the system size (Yeh and Hummer 2004 J. Phys. Chem. B 108 15873) to obtain the size-independent value. This also provides an estimate of the viscosity of all water models, which we compare to the Green-Kubo result. In all cases, a good agreement is found. The TIP4P/2005 model is in better agreement with the experimental data for both diffusion and viscosity. The SPC/E and Dang-Chang models overestimate the diffusion coefficient and underestimate the viscosity. (paper)
[en] Accurate radial-distribution functions obtained from a thermodynamically consistent integral equation are used to calculate upper and lower bounds to the Helmholtz free energies of several inverse-power potential fluids and the Lennard-Jones fluid. Comparisons with results from Monte Carlo simulations indicate that the true free energies are tightly bracketed by the variational bounds. In addition, the simulations agree with the arithmetic mean of the limits near melt to within about 0.03NkBT for inverse power fluids and about 0.06NkBT for Lennard-Jones fluids. These results indicate that it is possible to obtain accurate free energies very efficiently by the variational method
[en] A theoretical model for evaluating the photoelastic constants of ionic solids is developed by taking into account the long-range Coulombian, van der Waals and three-body interactions as well as the electronic polarizabilities of cations and anions. Hafemeister Flygare type short-range overlap repulsive potential effective upto nearest and next nearest neighbours is taken into account. The model is applied to calculate the photoelastic constants of ammonium halides with CsCl and NaCl type structures for the first time. The results obtained show a systematic trend in this group of solids. (author)
[en] We study the average separation between an elastic solid and a hard solid, with a nominally flat but randomly rough surface, as a function of the squeezing pressure. We present experimental results for a silicon rubber (PDMS) block with a flat surface squeezed against an asphalt road surface. The theory shows that an effective repulsive pressure acts between the surfaces of the form p∼exp(-u/u0), where u is the average separation between the surfaces and u0 a constant of the order of the root-mean-square roughness, in good agreement with the experimental results.