National Repository of Grey Literature 207 records found  beginprevious198 - 207  jump to record: Search took 0.01 seconds. 
Influence of content of functional groups on diffusion of metal ions in humic gels
Smitalová, Michaela ; Sedláček, Petr (referee) ; Klučáková, Martina (advisor)
This bachelor´s thesis deals with the study of diffusion of copper (II) ions in gels with different content of modified humic acids. The main objective of the thesis was to determine whether will occur immobilization of copper (II) ions in mixed gels and diffusion would occur faster or slower in comparison with gel-free modified humic acids. Classic humic acids were modified by methylation, which led to the suppression of their reactivity.
Study of diffusion of cupric ions in humic gel by methods of diffusion cells
Hrubá, Pavla ; Gregorová, Eva (referee) ; Klučáková, Martina (advisor)
This bachelor’s thesis is focussed on study of diffusion of cupric ions in humic gel by diffusion cells policy. The aim of this work was to introduce the diffusion cells to examination of transport metal ions in humic gels and to compare reached accomplishments with last diffusion’s experiments. The main advantage of this experimental technic was an automatization of all the gauging operation.
Diffusion of cupric ions in humic gel
Kalina, Michal ; Gregorová,, Eva (referee) ; Klučáková, Martina (advisor)
The bachelor´s thesis deals with the study of non–stationary diffusion of copper (II) ions in humic gel. The objective of the study was to validate that the diffusion is influenced by the volume of cupric ions solution and by the length of tubes filled with humic gel. Diffusion was characterized by the value of diffusion flux and by the copper (II) ionic concentration profiles in humic gel. The data necessary for calculation were obtained by spectrophotometric measuring of the extracts of each slice after diffusion.
Numerické simulace teplotního a vlhkostního pole ve střešních konstrukcích
Šmiták, Jan
In this bachelor thesis are compared different types of roof structures, whose compositions are different in type and thickness of the used materials. Explained is here of thermal transfer and water vapor diffusion of the structures. By using numerical simulation of calculation software which is based on the finite element method, described temperature and moisture field in stable (stationary) conditions in different geometric and boundary conditions.
Contribution to modelling the diffusion phenomena in the welded joints of steels
Řeháčková, L. ; Million, Bořivoj ; Dobrovská, J. ; Stránský, K.
This contribution contains the original results of measurement of redistribution of carbon in the welded joints of steels (low-alloy Si steel/low-alloy CrNiMoV steel and low-alloy Si steel/austenitic Cr18Ni9 steel). The measurement was carried out in the range of temperatures 500 - 750 C.
THE INFLUENCE OF HIGH TEMPERATURES ON THE DIRECTION OF CARBON DIFFUSION FLUX IN STEEL WELDMENTS
Kučera, Jaroslav ; Michalička, Petr ; Million, Bořivoj ; Rek, A. ; Stránský, K.
The redistribution of carbon in steel weldments heated at temperatures situated in the range 500 °C up to 1100 °C is reported. The sandwich-like specimens used for experiments were made from the steels A .IDENT. (ČSN 17242) and K .IDENT. (P91). It was stated that at low temperatures (500-750 °C) the carbon diffusion flux is directed from the steel A into the steel K and at high temperatures from K into A.
Computer simulation of up-hill diffusion in ČSN 17 242/P91 welded joint
Sopoušek, J. ; Million, Bořivoj ; Vřešťál, J.
The DICTRA software is used for simulating diffusion in multiphase diffusion couple ČSN 17242/P91 at temperature ranging 500-1100 C. The examples of calculated phase profiles, activity and concentration profiles of all species at selected condition are shown.

National Repository of Grey Literature : 207 records found   beginprevious198 - 207  jump to record:
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