. . . "P(1QS401250509), P(IAA4072402), Z(AV0Z40720504)" . . "Influence of Non-Perfect Step Input Concentration at the Feed Side of the Membrane Surface on the Diffusion Coefficient Evaluation"@en . "Kudrna, V." . . "15" . "Influence of Non-Perfect Step Input Concentration at the Feed Side of the Membrane Surface on the Diffusion Coefficient Evaluation" . . . "Vliv nedokonal\u00E9 skokov\u00E9 vstupn\u00ED koncentra\u010Dn\u00ED funkce na n\u00E1tokov\u00E9 stran\u011B povrchu membr\u00E1ny na vyhodnocen\u00ED difusn\u00EDho koeficientu"@cs . . "RIV/67985858:_____/06:00054888" . "\u010Cerm\u00E1kov\u00E1, Ji\u0159ina" . "Vapor diffusion coefficients in polymeric membranes were evaluated from dynamic permeation experiments. Membrane separated the diffusion cell into two parts - upstream and downstream. At the start of the experiment the concentration change in the upstream part (feed side) was made by substituting of the input stream of pure nitrogen by the stream of permeant vapors. The solution of the Fick\u2019s second law with the input step concentration function is used for the evaluation of diffusion coefficients. The mathematical model, which includes the input non-perfect step concentration function and the transport through a polymer was developed. The results of the study enable to estimate diffusion coefficient evaluation errors in the dependence on the experimental arrangements and on the membrane transport properties." . . "Influence of Non-Perfect Step Input Concentration at the Feed Side of the Membrane Surface on the Diffusion Coefficient Evaluation" . . "Vliv nedokonal\u00E9 skokov\u00E9 vstupn\u00ED koncentra\u010Dn\u00ED funkce na n\u00E1tokov\u00E9 stran\u011B povrchu membr\u00E1ny na vyhodnocen\u00ED difusn\u00EDho koeficientu"@cs . "Fialov\u00E1, Kate\u0159ina" . "3" . "Petri\u010Dkovi\u010D, Roman" . "6"^^ . "[18862C9D350D]" . "Influence of Non-Perfect Step Input Concentration at the Feed Side of the Membrane Surface on the Diffusion Coefficient Evaluation"@en . "Vapor diffusion coefficients in polymeric membranes were evaluated from dynamic permeation experiments. Membrane separated the diffusion cell into two parts - upstream and downstream. At the start of the experiment the concentration change in the upstream part (feed side) was made by substituting of the input stream of pure nitrogen by the stream of permeant vapors. The solution of the Fick\u2019s second law with the input step concentration function is used for the evaluation of diffusion coefficients. The mathematical model, which includes the input non-perfect step concentration function and the transport through a polymer was developed. The results of the study enable to estimate diffusion coefficient evaluation errors in the dependence on the experimental arrangements and on the membrane transport properties."@en . . "1022-1344" . . "Difusn\u00ED koeficienty par v polymern\u00EDch membr\u00E1n\u00E1ch jsou vyhodnocov\u00E1ny z dynamick\u00FDch experiment\u016F. Na za\u010D\u00E1tku experimentu byla provedena koncentra\u010Dn\u00ED zm\u011Bna na n\u00E1tokov\u00E9 stran\u011B membr\u00E1ny nahrazen\u00EDm proudu vstupn\u00EDho plynu \u010Dist\u00E9ho dus\u00EDku proudem par permeantu. K vyhodnocen\u00ED difusn\u00EDch koeficient\u016F bylo pou\u017Eito \u0159e\u0161en\u00ED Fickova z\u00E1kona se vstupn\u00ED skokovou koncentra\u010Dn\u00ED funkc\u00ED. Tento p\u0159\u00EDsp\u011Bvek se zab\u00FDv\u00E1 popisem experiment\u00E1ln\u011B z\u00EDskan\u00E9 funkce a studiem jej\u00EDho vlivu na vyhodnocen\u00E9 hodnoty difusn\u00EDch koeficient\u016F. Byl vyvinut matematick\u00FD model, kter\u00FD zahrnuje nedokonalou skokovou vstupn\u00ED koncentra\u010Dn\u00ED funkci a transport membr\u00E1nou. V\u00FDsledek studie umo\u017E\u0148uje odhadnout chybu difusn\u00EDho koeficientu v z\u00E1vislosti na experiment\u00E1ln\u00EDm uspo\u0159\u00E1d\u00E1n\u00ED a na vlastnostech membr\u00E1ny."@cs . . "4"^^ . "Uchytil, Petr" . . "246;251" . . . . . "5"^^ . . . "RIV/67985858:_____/06:00054888!RIV07-AV0-67985858" . . "diffusion coefficient; flux; dispersion"@en . "Macromolecular Theory and Simulations" . "DE - Spolkov\u00E1 republika N\u011Bmecko" . "479452" .