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Xem 1-20 trên 545 kết quả Diffusivity
  • This book is the result of many years of clinical and academic interest in diffusion-weighted MR (DW) imaging of the brain. Researchers and clinicians at the University of Rochester started to collect DW images of a spectrum of abnormalities affecting the brain immediately after this technique became available. Several case series with clinical and radiographic correlations have been presented at the annual meetings of the American Society of Neuroradiology and the Radiological Society of North America via posters and scientific reports....

    pdf241p echbuon 02-11-2012 40 10   Download

  • Diffusion is the transport of matter from one point to another by thermal motion of atoms or molecules. It is relatively fast in gases, slow in liquids, and very slow in solids. Diffusion plays a key rˆole in many processes as diverse as intermixing of gases and liquids, permeation of atoms or molecules through membranes, evaporation of liquids, drying of timber, doping silicon wafers to make semiconductor devices, and transport of thermal neutrons in nuclear power reactors.

    pdf0p khangoc2391 11-08-2012 44 4   Download

  • THE IMPACT OF NATIONAL CULTURE AND OTHER NATIONAL-LEVEL INDICATORS ON INFORMATION TECHNOLOGY (IT) DIFFUSION The above results thus suggest that the argument (Brennan and Buchanan, 1980; Hoxby, 2000a) that average school performance should be higher in markets with decentralized governance may not hold. The SAT data permit a direct test of this prediction, however.

    pdf402p mualan_mualan 25-02-2013 44 4   Download

  • This paper brings a marriage of two seemly unrelated topics, natural language processing (NLP) and social network analysis (SNA). We propose a new task in SNA which is to predict the diffusion of a new topic, and design a learning-based framework to solve this problem. We exploit the latent semantic information among users, topics, and social connections as features for prediction. Our framework is evaluated on real data collected from public domain.

    pdf5p nghetay_1 07-04-2013 36 2   Download

  • In  Molecular simulation of nanoparticle diffusion at fluid interfaces molecular dynamics simulations are used to exam- ine the transport properties of a nanoparticle in both bulk solvent and at a liquid–liquid interface. Specifically it aims to address the effect of interfacial adsorption on the diffusion of nanoparticles (at low concentration).


    pdf5p hoquangbio 22-07-2015 17 2   Download

  • The diffusion behaviour of water and HCl solution at different temperatures and concentrations into a modified polyethylene filled with carbon black used for lining is presented. It has shown the predominant role of nature of environment and carbon black content. In the both environments, an increase of environmental temperature increased the capacity of environmental absorption and the diffusion rate.

    pdf11p tuanlocmuido 19-12-2012 20 1   Download

  • In this paper, finite difference schemes are proposed to approximate solutions of stochastic advection-diffusion equations. We used central-difference formula of third-order to approximate spatial derivatives. The stability, consistency and convergence of the scheme are analysed and established. A numerical result is also given to demonstrate the computational efficiency of the stochastic schemes.

    pdf9p tieuthi3006 16-03-2018 24 1   Download

  • In this paper, the uphill and osmotic diffusion in single component systems (single uphill and osmotic diffusion) are presented and simulated. Results showed that: The uphill and osmotic diffusion can take place for single component systems; the cause of single uphill and osmotic diffusion is thermal velocity of molecules in low concentration region is greater than that in high concentration region; simulated results agree with the theory.

    pdf6p truongtien_09 08-04-2018 14 0   Download

  • The dynamic properties of iron liquid (Fe) are studied by molecular dynamics (MD) simulation. We trace the evolution of local density fluctuations (LDFs) in Fe liquid over the simulation time and in the 300-2300 K temperature range. The result simulation reveals that atomic diffusion is realized through the LDFs and the high localization LDFs at low temperature in the iron liquid is the cause of the anomalous dynamics slowdown. We find that the diffusion depends on both rate of LDFs and the averaged square displacement of particles Fe as one LDF occurs.

    pdf6p blackwidow123 15-06-2018 8 0   Download

  • In this paper, the author study positive recurrence for a wide class of jump diffusions by using Khasminskii’s approach developed in. We show that the property of positive recurrence is independent of the choice of the bounded domain in the state space. Moreover, the author establish a sufficient condition for positive recurrence using Liapunov functions.

    pdf10p trieuroger 11-09-2018 9 0   Download

  • In many-particle case, the blocking effect results in decreasing correlation factor F and average time τjump between two consecutive jumps. With increasing the number of particles, the diffusion coefficient DM decreases for site-energy and transition-energy disordered lattices due to the F-effect affects stronger than τ -effect. Furthermore, the blocking effect almost is temperature independent for both lattices.

    pdf12p thuyliebe 09-10-2018 5 0   Download

  • Integral model is simple in utilization, low in CPU time calculation, suitable for a lot of practical applications of turbulent diffusion jet. . However the assessment of accuracy of the model should be carried out by experimental data and by results of available multidirectional codes. The present paper shows the comparison of velocity profiles given by the integral model and the CFD FLUENT 6.0 Code. The difference in results given by the two models is lower than 10% when Reynolds number at the exit nozzle below 5000.

    pdf8p nguyenthuy1207 25-10-2018 25 0   Download

  • This paper is devoted to application of Generalized Diffusion Theory for solving a sedimentation problem of rigid spherical particles in viscous fluid. The governing equations have been obtained. It is shown that, in this case the governing equation system is a hyperbolic one, and the equations in the characteristic form have been derived.

    pdf8p chikychiky 26-10-2018 4 0   Download

  • The article [10] has presented the necessity of the classification into two types: Isolated wakes and coupled wakes. In this report, different types of momentum defect diffusion at the begining of wake are analysed for the two types of coupled wake and isolated wake. According to ·numerical results obtained, we analyse the e.xistence - long or short - of the wake establislrment zone before the wake established zone, and this zone is very different between isolated wake and coupled wake.

    pdf9p chikychiky 01-11-2018 6 0   Download

  • In this paper, we study about the synchronization in complete network consisting of n nodes. Each node is connected to all other nodes by linear coupling and it is represented by a system of reaction-diffusion of FitzHugh-Nagumo type which is obtained by simplifying the famous Hodgkin-Huxley model.

    pdf8p danhnguyentuongvi 17-12-2018 10 0   Download

  • This paper is concerned with the existence of monotone traveling wavefronts in a single species model with nonlocal diffusion and age-structure. We first apply upper and lower solution technique to prove the result if the wave speed is larger than a threshold depending only on the basic parameters.

    pdf8p tuongvidanh 06-01-2019 4 0   Download

  • In this paper, we study the quenching behavior of the solution of a semilinear reaction-diffusion system with singular boundary condition. We first get a local exisence result. Then we prove that the solution quenches only on the right boundary in finite time and the time derivative blows up at the quenching time under certain conditions.

    pdf15p danhdanh27 07-01-2019 1 0   Download

  • This paper presents a new numerical approach to solve single and multiterm time fractional diffusion equations. In this work, the space dimension is discretized to the Gauss−Lobatto points. We use the normalized Grunwald approximation for the time dimension and a pseudospectral successive integration matrix for the space dimension.

    pdf16p danhdanh27 07-01-2019 0 0   Download

  • In this paper, a new approach for solving space fractional order diffusion equations is proposed. The fractional derivative in this problem is in the Caputo sense. This approach is based on shifted Chebyshev polynomials of the fourth kind with the collocation method.

    pdf15p danhdanh27 07-01-2019 5 0   Download

  • The local convergence condition is proposed and the optimal parameter is given. Numerical experiments are used to show the efficiency of the NPHSS-KPIK iteration method for solving the Sylvester equations arising from the time-periodic fractional diffusion equations.

    pdf15p danhdanh27 07-01-2019 3 0   Download



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