Efficient Mass Conserving Reformulation Schemes for Nonlinear Solid-Phase Spherical Diffusion Equation for Lithium Intercalation

2014 ◽  
Keyword(s):  
Diffusion Equation ◽  
Solid Phase ◽  
Lithium Intercalation ◽  
Spherical Diffusion

Stochastic model of the flow mechanically stirred solid-liquid system

1980 ◽  
Vol 45 (7) ◽  
pp. 2070-2084 ◽  
Author(s):  
Vladimír Kudrna ◽  
Václav Machoň ◽  
Vlasta Hudcová
Keyword(s):  
Diffusion Equation ◽  
Stochastic Model ◽  
Boundary Conditions ◽  
Stationary State ◽  
Flow System ◽  
Solid Phase ◽  
Liquid System ◽  
Ideal Mixing ◽  
Phase Liquid ◽  
Solid Liquid

An attempt is made to describe by use of the onedimensional stochastic model the flow system solid phase-liquid stirred by the mechanical rotary mixer. At the assumption that the solid phase is dimensionally homogenous a diffusion equation has been obtained which is solved under the boundary conditions, characterizing the method of withdrawal of the solid phase from the system. It is demonstrated that the model can express also the relations usually used for description of similar situations (ideal mixing, separation coefficients in stationary state etc.) like individual cases.

A probability form of the diffusion equation and its use to describe the distribution of the solid phase particle concentrations in a mechanically agitated charge

1986 ◽  
Vol 51 (9) ◽  
pp. 1910-1924 ◽  
Author(s):  
Vladimír Kudrna ◽  
Marie Sýsová ◽  
Ivan Fořt
Keyword(s):  
Markov Process ◽  
Diffusion Equation ◽  
Incompressible Liquid ◽  
Chemical Engineering ◽  
Solid Phase ◽  
Phase Particle ◽  
Local Concentration ◽  
Diffusion Term ◽  
Solid Phase Particle ◽  
Made In

An attempt is made in this paper to describe the solid particle motion in a flowing (agitated) incompressible liquid on the assumption that this motion may be considered as a diffusion Markov process. It is shown that such a procedure leads to a relation which differs from the diffusion equation commonly used in chemical engineering by the form of diffusion term. The expression proposed, unlike the relation usually used, makes it possible to describe the local concentration extremes of solid phase in the charge mixed.

Analytical description of the solid phase particle distribution in a mechanically agitated system

1988 ◽  
Vol 53 (6) ◽  
pp. 1198-1216
Author(s):  
Marie Sýsová ◽  
Ivan Fořt ◽  
Vladimír Kudrna
Keyword(s):  
Mathematical Model ◽  
Diffusion Equation ◽  
Particle Distribution ◽  
Draft Tube ◽  
Solid Phase ◽  
Phase Particle ◽  
Analytical Description ◽  
Random Motion ◽  
Solid Phase Particle ◽  
Calculated Distribution

A mathematical model of the solid particle random motion in a turbulent liquid flow was developed which resulted in an unconventional form of diffusion equation. The diffusion equation derived describes quantitatively the local extremes of the solid phase concentrations in the charge mixed which were verified experimentally. The comparison of the experimental and calculated distribution of local concentrations in the system shows an adequate qualitative agreement. The system consisted of a cylindrical conical-bottomed vessel with baffles and cylindrical draft-tube. A six-blade impeller with inclined (at α = 45° plane blades was used for agitating.

Effect of powder granulation on hydrogen transport rate and hydrogen solubility in LaNi5-paraffin composite material

2012 ◽  
Vol 57 (3) ◽  
pp. 727-731 ◽  
Author(s):  
I. Kukuła ◽  
H. Bala
Keyword(s):  
Hydrogen Diffusion ◽  
Diffusion Rate ◽  
Solid Phase ◽  
Hydrogen Transport ◽  
Composite Electrodes ◽  
Apparent Diffusion ◽  
Deaerated Solution ◽  
Powder Particles ◽  
Discharge Method ◽  
Spherical Diffusion

On the basis of potentiostatic discharge method, the diffusion rate of atomic hydrogen as well as its solubility in LaNi5 crystal lattice have been evaluated for three LaNi5 powder - paraffin composite electrodes, with different LaNi5 powder particle diameters: 0 - 20 μm, 20 - 50 μm and 50 - 100 μm. The chronoamperommetric tests have been carried out in strong alkaline (6 M KOH), deaerated solution, at 25°C. Apparent hydrogen diffusion coefficients have been determined using Crank’s spherical diffusion model. It has been shown, that increase of particle size is prone to increase of hydrogen apparent diffusion coefficient and to decrease of hydrogen concentration in the solid phase. To explain the granulation effect on hydrogenation ability parameters, the inhibition of hydrogen transport by surfacial corrosion products present on powder particles has been assumed.

Solid-phase immunoelectron microscopy for rapid diagnosis of enteroviruses

1984 ◽  
Vol 42 ◽  
pp. 226-227 ◽  
Author(s):  
K. Pegg-Feige ◽  
F. W. Doane
Keyword(s):  
Electron Microscopy ◽  
Cell Culture ◽  
Immunoelectron Microscopy ◽  
Detection Method ◽  
Solid Phase ◽  
Protein A ◽  
Plant Viruses ◽  
Rapid Diagnosis ◽  
Virus Diagnosis ◽  
Antiviral Antibody

Immunoelectron microscopy (IEM) applied to rapid virus diagnosis offers a more sensitive detection method than direct electron microscopy (DEM), and can also be used to serotype viruses. One of several IEM techniques is that introduced by Derrick in 1972, in which antiviral antibody is attached to the support film of an EM specimen grid. Originally developed for plant viruses, it has recently been applied to several animal viruses, especially rotaviruses. We have investigated the use of this solid phase IEM technique (SPIEM) in detecting and identifying enteroviruses (in the form of crude cell culture isolates), and have compared it with a modified “SPIEM-SPA” method in which grids are coated with protein A from Staphylococcus aureus prior to exposure to antiserum.

Application of solid-phase immune electron microscopy to study physical and stability characteristics of enterically transmitted non-a, non-b hepatitis virus

1988 ◽  
Vol 46 ◽  
pp. 80-81
Author(s):  
Charles D. Humphrey ◽  
E. H. Cook ◽  
Karen A. McCaustland ◽  
Daniel W. Bradley
Keyword(s):  
Electron Microscopy ◽  
Hepatitis A ◽  
Hepatitis A Virus ◽  
Solid Phase ◽  
Etiologic Agent ◽  
World Health ◽  
Health Concern ◽  
Morphological Identification ◽  
Immune Electron Microscopy

Enterically transmitted non-A, non-B hepatitis (ET-NANBH) is a type of hepatitis which is increasingly becoming a significant world health concern. As with hepatitis A virus (HAV), spread is by the fecal-oral mode of transmission. Until recently, the etiologic agent had not been isolated and identified. We have succeeded in the isolation and preliminary characterization of this virus and demonstrating that this agent can cause hepatic disease and seroconversion in experimental primates. Our characterization of this virus was facilitated by immune (IEM) and solid phase immune electron microscopic (SPIEM) methodologies.Many immune electron microscopy methodologies have been used for morphological identification and characterization of viruses. We have previously reported a highly effective solid phase immune electron microscopy procedure which facilitated identification of hepatitis A virus (HAV) in crude cell culture extracts. More recently we have reported utilization of the method for identification of an etiologic agent responsible for (ET-NANBH).

Identification of hepatitis a virus in cell cultures by solid phase immune electron microscopy

1986 ◽  
Vol 44 ◽  
pp. 238-239
Author(s):  
C.D. Humphrey ◽  
T.L. Cromeans ◽  
E.H. Cook ◽  
D.W. Bradley
Keyword(s):  
Electron Microscopy ◽  
Liquid Phase ◽  
Cell Cultures ◽  
Rapid Detection ◽  
Hepatitis A ◽  
Hepatitis A Virus ◽  
Solid Phase ◽  
Immune Electron Microscopy ◽  
Detection And Identification

There is a variety of methods available for the rapid detection and identification of viruses by electron microscopy as described in several reviews. The predominant techniques are classified as direct electron microscopy (DEM), immune electron microscopy (IEM), liquid phase immune electron microscopy (LPIEM) and solid phase immune electron microscopy (SPIEM). Each technique has inherent strengths and weaknesses. However, in recent years, the most progress for identifying viruses has been realized by the utilization of SPIEM.

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