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Temperature effects on the diffusion of water and monovalent counterions in the hydrated montmorillonite
Zheng, Y.; Zaoui, A. - In: Physica A: Statistical Mechanics and its Applications 392 (2013) 23, pp. 5994-6001
We investigate here the effect of temperature on the diffusion of water and cations in the Wyoming-type montmorillonite … interlayer ions and water molecules under a temperature range between 260 and 400 K. The diffusion coefficient of water and … cations in different hydrated clays increases with temperature. The influence of temperature on the diffusion of water is much …
Persistent link: https://www.econbiz.de/10010703206
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Influence of mass difference on dynamic properties of isotope mixtures
Kiriushcheva, N.; Kuzmin, S.V. - In: Physica A: Statistical Mechanics and its Applications 352 (2005) 2, pp. 509-521
properties that result from mass heterogeneity, by calculating the diffusion coefficient, velocity autocorrelation function, non … proposed universal scaling law for atomic diffusion in condensed matter (Nature 381 (1996) 137). …
Persistent link: https://www.econbiz.de/10011059117
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Central limit theorem for the integrated squared error of the empirical second-order product density and goodness-of-fit tests for stationary point processes
Heinrich, Lothar; Klein, Stella - In: Statistics & Risk Modeling 28 (2011) 4, pp. 359-387
Abstract Spatial point processes are mathematical models for irregular or random point patterns in the d -dimensional space, where usually d  = 2 or d  = 3 in applications. The second-order product density and its isotropic analogue, the pair correlation function, are important tools for...
Persistent link: https://www.econbiz.de/10014622210
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Estimation variances for estimators of product densities and pair correlation functions of planar point processes
Stoyan, D.; Bertram, U.; Wendrock, H. - In: Annals of the Institute of Statistical Mathematics 45 (1993) 2, pp. 211-221
Persistent link: https://www.econbiz.de/10005184681
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Cluster structure and dynamics in a mesoscopic solvent
Lee, Song Hi; Kapral, Raymond - In: Physica A: Statistical Mechanics and its Applications 298 (2001) 1, pp. 56-68
scales, the effects of hydrodynamic interactions on single and multi-particle diffusion are taken into account. …
Persistent link: https://www.econbiz.de/10010590775
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Influence of the Coulomb interaction on the Fermi hole in an electron liquid
Horiuchi, Masafumi; Endo, Takanori; Yasuhara, Hiroshi - In: Physica A: Statistical Mechanics and its Applications 255 (1998) 1, pp. 48-64
From the diagrammatic analysis, it is proved that the spin-parallel part of the static structure factor of an electron liquid, S↑↑(q), has the following exact asymptotic form for q⪢pf: S↑↑(q)−1=4(αrs/π)(pf/q)6d2g↑↑(r)/d(pfr)2|pfr=0+⋯, α=(4/9π)1/3, where pf is the Fermi wave...
Persistent link: https://www.econbiz.de/10011058799
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Further notes concerning the partial pair correlation functions of liquid (ambient) water
Pusztai, László - In: Physica A: Statistical Mechanics and its Applications 314 (2002) 1, pp. 514-520
Methods for deriving partial pair correlation functions for liquid water are considered. It is argued that the one based on Reverse Monte Carlo modeling [Phys. Rev. B 60 (1999) 11851] is more suitable for the purpose than direct separation (of which the latter is based on the inversion of the...
Persistent link: https://www.econbiz.de/10011062656
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On the realizability of pair correlation functions
Uche, O.U.; Stillinger, F.H.; Torquato, S. - In: Physica A: Statistical Mechanics and its Applications 360 (2006) 1, pp. 21-36
The pair correlation function g2(r) provides a basic geometric descriptor for many-particle systems. It must obey two necessary conditions: (i) non-negativity for all distances r, and (ii) non-negativity of its associated structure factor S(k) for all k. Here we utilize an improved stochastic...
Persistent link: https://www.econbiz.de/10011062940
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Ring approximation at equilibrium: The hard sphere pair correlation function
Piasecki, Jarosław; Soto, Rodrigo - In: Physica A: Statistical Mechanics and its Applications 379 (2007) 2, pp. 409-416
The ring approximation has been used in the kinetic theory of hard sphere fluids to investigate non-equilibrium phenomena depending on dynamic correlations, not included in the Boltzmann or Enskog equations. We show that when applied to equilibrium the ring approximation reproduces correctly the...
Persistent link: https://www.econbiz.de/10011062949
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A simple automated system for the routine production of (99m)Tc by methyl ethyl ketone extraction
Klopper J.F.; Van Heerden P.D.R.; Muller U.D.; Baard W.P.; … - 1974
A relatively simple, automated system for the rapid, efficient and safe routine production of 99Tc(m)O4 from 99Mo03 by the metyl ethyl ketone (MEK) extraction technique is described. The 4 phases of the extraction process (bubbling of air, phase separation, drawing off of 99Tc(m) in MEK, and...
Persistent link: https://www.econbiz.de/10009480499