共查询到20条相似文献,搜索用时 31 毫秒
1.
V. V. Ovcharov V. I. Rudakov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2009,3(4):639-643
The influence of fluxes of intrinsic nonequilibrium semiconductor defects on impurity diffusion in a nonuniform temperature field is considered in the framework of the phenomenological theory of irreversible processes. The mass transfer coefficient defined as the ratio of the concentrations of nonequilibrium and equilibrium defects is introduced to take the excessive concentration of nonequilibrium defects into account. The introduction of this coefficient into equations for matter and heat fluxes makes it possible to express the parameters of the process of thermal diffusion (the diffusion coefficient and the heat of transport) as a time-dependent function of the excessive concentration of intrinsic nonequilibrium semiconductor defects. 相似文献
2.
V. N. Zirakashvili 《Journal of Experimental and Theoretical Physics》1998,87(2):218-222
A variational method is used to obtain estimates of the effective particle transport coefficients in a random static magnetic
field. The particle propagation is described by an anisotropic diffusion equation. The diffusion coefficient parallel to the
local magnetic field is much greater than the transverse diffusion coefficient. For large-scale magnetic-field variations
the diffusion is described by effective coefficients. The variational approach can be used to find the effective parallel
and perpendicular diffusion coefficients. It was shown that the instability growth rate of the magnetic field lines determines
the upper estimate of the effective transverse diffusion coefficient.
Zh. éksp. Teor. Fiz. 114, 398–405 (August 1998) 相似文献
3.
Andrey V. Kuznetsov 《Central European Journal of Physics》2011,9(5):1372-1378
A model of retrograde axonal transport of neurotropic viruses is developed. The model accounts for active viral transport
by dynein motors as well as for passive transport by diffusion; the destruction of the virus as it propagates toward the neuron
soma is modeled utilizing a first-order decay rate process. The effect of a limited time during which the axonal synapse is
exposed to the virus is incorporated. An analytical solution is obtained. The obtained solution makes it possible to identify
four different regimes of viral transport in the axon that correspond to the following situations: (1) Small viral diffusivity
and small rate of viral destruction; (2) Large viral diffusivity and small rate of viral destruction; (3) Small viral diffusivity
and large rate of viral destruction; (4) Large viral diffusivity and large rate of viral destruction. Characteristic features
of these regimes are discussed. 相似文献
4.
5.
Miesch MS Brandenburg A Zweibel EG 《Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics》2000,61(1):457-467
We present a Green's function approach for quantifying the transport of a passive scalar (tracer) field in three-dimensional simulations of turbulent convection. Nonlocal, nondiffusive behavior is described by a transilient matrix (the discretized Green's function), whose elements contain the fractional tracer concentrations moving from one subvolume to another as a function of time. The approach was originally developed for and applied to geophysical flows, but here we extend the formalism and apply it in an astrophysical context to three-dimensional simulations of turbulent compressible convection with overshoot into convectively stable bounding regions. We introduce a novel technique to compute this matrix in a single simulation by advecting labeled particles rather than solving the passive scalar equation for a large number of different initial conditions. The transilient matrices thus computed are used as a diagnostic tool to quantitatively describe nonlocal transport via matrix moments and transport coefficients in a generalized, multiorder diffusion equation. Results indicate that transport in both the vertical and horizontal directions is strongly influenced by the presence of coherent velocity structures, generally resembling ballistic advection more than diffusion. The transport of a small fraction of tracer particles deep into the underlying stable region is reasonably efficient, a result which has possible implications for the problem of light-element depletion in late-type stars. 相似文献
6.
Long-time chronoamperometry of TiS2 electrodes immersed in saturated LiClO4/DMF solution was employed to investigate the charge transport processes which govern the rate of Li+ intercalation in TiS2. The intercalation rate and hence, the current, appears to be controlled by the rate of Li+ diffusion within the TiS2. A model has been developed which predicts the current-time behavior under the control of Li+ solid state diffusion. The close agreement of this model with the experimental data allows the solid state diffusion coefficient and other transport parameters (such as effective electrode area) to be evaluated from the measured average grain boundary distance. Typical TiS2 grain boundary distances in the 3–10 μm range yield a geometric mean value of 1.3 × 10?9 cm2/s for the solid state diffusion coefficient; this is in close agreement with previously reported diffusivities as measured by NMR spin-lattice relaxation techniques. 相似文献
7.
The transport of runaway electrons in a high-temperature plasma is
relatively easy to measure in a steady state experiment and a perturbation
experiment, which provides runaway electron diffusion coefficient
Dr. This diffusion coefficient is
determined by internal magnetic fluctuations, so it can be
interpreted in terms of a magnetic fluctuation level. The internal magnetic
fluctuation level ($\tilde {b}r/BT is estimated
to be about (2--4)×-4 in the HL-1M plasma. The
results presented here demonstrate the effectiveness of using runaway
electron transport techniques to determine internal magnetic
fluctuations. A profile of magnetic fluctuation level in the
HL-1M plasma can be estimated from Dr. 相似文献
8.
Matcher SJ 《Optics letters》1999,24(23):1729-1731
The question of whether a unique distribution of the absorption coefficient, the scattering coefficient, and the refractive index of a turbid medium can be reconstructed by optical tomography is considered. A recent publication [Opt. Lett. 23, 882 (1998)] established that such reconstruction is not possible when photon transport is well modeled by the diffusion equation. A simple proof is offered that, when measurements at high modulation frequencies are included, the more exact P1 model of light transport suggests that this reconstruction may be possible. 相似文献
9.
This paper describes the behaviour of impurity transport in HL-2A ohmic discharges. In 2005, small quantities of metallic impurities (A1, Ni and Ti) were successfully injected into HL-2A plasmas by laser blow-off technique, and their progression was followed by the soft x-ray cameras with good spatial and temporal resolutions. The impurity confinement time is estimated from the characteristic decay time of the soft x-ray signal of the injected impurities, and it is about 30-60 ms. The transport coefficients of impurities (including diffusion coefficient and convection velocity) in radial different region have been derived by using a one-dimenslonal impurity transport code, the results present that diffusion coefficient is much smaller in the central region of plasmas than the outside of it, and it is much larger than that of neoclassical theory predictions; namely, it is anomalous.[第一段] 相似文献
10.
Xiaofeng Han Xiang Gao Yinxian Jie Junyu Zhao Qing Zang Wei Gao 《Physics letters. A》2010,374(45):4602-4606
The particle transport coefficients were investigated in ac plasmas by density modulation method on HT-7 tokamak. It is observed that the particle diffusion coefficient (D) is almost the same in various cases and varies with the electron density. The convection velocity (V) is equal to the value of inward pinch velocity (VE×B) for low and high density discharges. The particle confinement time becomes much higher when the directions of plasma current and toroidal field are uniform. 相似文献
11.
Light propagation in the digital head phantom for virtual near infrared spectroscopy and imaging is calculated by diffusion
theory. In theory, diffusion approximation is not valid in a low-scattering cerebrospinal fluid (CSF) layer around the brain.
The optical path length and spatial sensitivity profile predicted by the finite element method based upon the diffusion theory
are compared with those predicted by the Monte Carlo method to validate a practical implementation of diffusion approximation
to light propagation in an adult head. The transport scattering coefficient of the CSF layer is varied from 0.01 to 1.0 mm−1 to evaluate the influence of that layer on the error caused by diffusion approximation. The error is practically ignored
and the geometry of the brain surface such as the sulcus structure in the digital head phantom scarcely affects the error
when the transport scattering coefficient of the CSF layer is greater than 0.3 mm−1. 相似文献
12.
13.
A critical analysis is performed of the mathematical expressions used to compute the diffusion coefficients of components on the basis of data on the growth rate or dissolution of crystals of AIIIBV compounds. It is shown that neglect of high-order terms of the series that are the solution of the mass transport differential equations will result in substantial errors during processing of the experimental results. To simplify the computations and eliminate mathematical inaccuracy, it is proposed to use the analytic solution of the diffusion mass transport equations in the approximation of a semi-infinite medium. The diffusion coefficient of arsenic in liquid indium in the 550–750C temperature range is computed on the basis of experimental results on the rate of InAs dissolution in an unsaturated In-As melt by using the method proposed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 19–25, April, 1987. 相似文献
14.
15.
A theory of the uniform thermophoretic motion of a liquid volatile spherical drop in a binary gas mixture is developed based on hydrodynamic analysis. One of the components undergoes the phase transition on the surface. The solution of the problem makes it possible to estimate the effect of the evaporation rate on the rate and direction of thermophoresis, as well as on the distributions of the velocity, temperature, and concentration of the volatile component. The thermal diffusion of the gas mixture, together with Stefan and capillary phenomena, is taken into account. The velocity of thermophoretic transport is expressed through the evaporation coefficient of the drop by the formula that generalizes the known results of the conventional theories for the cases of weak and moderately intense diffusive evaporation of a liquid drop. 相似文献
16.
M. C. Marchetti T. R. Kirkpatrick J. R. Dorfman 《Journal of statistical physics》1987,49(3-4):871-872
The mode coupling contribution to the transverse transport coefficients of a three-dimensional one-component plasma in a strong external magnetic field is calculated. For very strong fields it is found that the tagged particle diffusion rate, the thermal diffusion rate, and the coefficient of viscosity in the plane orthogonal to the field have a Bohm-like B
–1 behavior. The mode coupling mechanism responsible for such an effect is always one that involves the finite-frequency upper hybrid modes. 相似文献
17.
L. Haeggqwist L. Schimansky-Geier I. M. Sokolov F. Moss 《The European physical journal. Special topics》2008,157(1):33-42
We study the diffusion coefficient of Active Brownian particles in
two dimensions. In addition to usual attributes of active motion we
let the particles turn in preferred directions over random times.
This angular motion is modeled by an effective Lorentz force with
time dependent frequency switching between two values at
exponentially distributed random times. The diffusion coefficient is
calculated by the Taylor-Kubo formula where distributions found from
a Fokker-Planck equation or from a continuous time random walk
approach have been inserted for averaging. Eventually properties
of the diffusion coefficient will be discussed. 相似文献
18.
Nur Izzati Ishak S V Muniandy Vengadesh Periasamy Fong-Lee Ng Siew-Moi Phang 《中国物理 B》2017,26(8):88203-088203
In this work, we study the regional dependence of transport behavior of microalgae Chlorella vulgaris inside microfluidic channel on applied fluid flow rate. The microalgae are treated as spherical naturally buoyant particles. Deviation from the normal diffusion or Brownian transport is characterized based on the scaling behavior of the mean square displacement(MSD) of the particle trajectories by resolving the displacements in the streamwise(flow) and perpendicular directions.The channel is divided into three different flow regions, namely center region of the channel and two near-wall boundaries and the particle motions are analyzed at different flow rates. We use the scaled Brownian motion to model the transitional characteristics in the scaling behavior of the MSDs. We find that there exist anisotropic anomalous transports in all the three flow regions with mixed sub-diffusive, normal and super-diffusive behavior in both longitudinal and transverse directions. 相似文献
19.
20.
The concentration of radon in soil usually varies between a few kBq/m3 and tens or hundreds of kBq/m3 depending upon the geographical region. This causes the transport of radon from the soil to indoor environments by diffusion and advection through the pore space of concrete. To reduce indoor radon levels, the use of concrete with low porosity and a low radon diffusion coefficient is recommended. A method of reducing the radon diffusion coefficient through concrete and hence the indoor radon concentration by using silica fume to replace an optimum level of cement was studied. The diffusion coefficient of the concrete was reduced from (1.63 ± 0.3) × 10−7 to (0.65 ± 0.01) × 10−8 m2/s using 30% substitution of cement with silica fume. The compressive strength of the concrete increased as the silica-fume content increased, while radon exhalation rate and porosity of the concrete decreased. This study suggests a cost-effective method of reducing indoor radon levels. 相似文献