No (142)
Yes (1)
Number of found documents:
143
Published from
to
Voltage-step Transient in Redox Systems III. Effect of the Current Primary Distribution via Nernst Model
Wein, Ondřej
2010 - English
In addition to the common transient diffusion (Cottrell), there are further transport results that cannot be neglected: Faradic resistance at surface of the working electrode, and Ohmic resistance in the bulk of streaming electrolyte solution between the working and counter electrodes. These additional resistances are analyzed here for the voltage-step transient (VST) process using the Nernst model of a two-electrode cell (no reference electrode). The Faradic resistance is considered for a single redox couple O + ne- = R according to Butler-Volmer electrode kinetics. The effect of Ohmic and Faradic resistances in VST is accounted for using two models: the recently updated 1D approximation and a new model that accepts primary current distribution for a circular electrode. It is shown that the 1D approximation introduces unacceptable errors.
Keywords:
distributed nernst model; ohmic and faradic resistance; primary current distribution
Available at various institutes of the ASCR
Voltage-step Transient in Redox Systems III. Effect of the Current Primary Distribution via Nernst Model
In addition to the common transient diffusion (Cottrell), there are further transport results that cannot be neglected: Faradic resistance at surface of the working electrode, and Ohmic resistance in ...
Motion of a Spherical Bubble in Neighborhood of a Falling Sphere
Vejražka, Jiří
2009 - English
This report focuses on a motion of a small spherical bubble, which rises in a still liquid particle and encounters a falling spherical particle. We consider the case of very small bubbles and of relatively large particle (whose size is much bigger compared to the bubble). The report provides expressions for forces acting on the bubble and equations for the bubble motion. The motion equations form a system of ordinary differential equations, which should be solved numerically. The purpose of this study is to provide a mathematical model, which would describe experimental observations by Hubička et al. (2009). In these experiments, a decrease of collision efficiency of the flotation process is observed if the particle is moving, compared to the case of still particle. Práce se zaměřuje na pohyb malé kulové bubliny, která stoupá v nehybné kapalině a střetává se s padající kulovou částicí. Je uvažován případ malé bubbliny a mnohem větší částice (s průměrem výrazně větším, než je velikost bubliny). Zpráva udává výrazy pro úříslušné síly, které je třeba uvažovat v pohybové rovnici pro bublinu. Výsledkem je pohybová rovnice, kterou je možné řešit numericky. Cílem práce je poskytnout matematický model, který by popsal experimentální pozorování Hubičky a kol. (2009). V těchto experimentech, které sledují kolizní účinnost flotačního procesu, byl pozorován výrazný pokles účinnosti v případě, že se částice pohybovala, ve srovnání s nehybnou částicí.
Keywords:
bubble motion; spherical particle; force model
Available at various institutes of the ASCR
Motion of a Spherical Bubble in Neighborhood of a Falling Sphere
This report focuses on a motion of a small spherical bubble, which rises in a still liquid particle and encounters a falling spherical particle. We consider the case of very small bubbles and of ...
Standard Operating Procedure Excel Table for JMP Import
Křišťál, Jiří; Maes, P.
2009 - English
Standard operating procedure was developed to establish the correct procedure for the preparation of MS Excel data table that can be later easily imported to JMP and directly used for evaluation.
Keywords:
standard operating; excel; jmp import
Available at various institutes of the ASCR
Standard Operating Procedure Excel Table for JMP Import
Standard operating procedure was developed to establish the correct procedure for the preparation of MS Excel data table that can be later easily imported to JMP and directly used for evaluation.
EDWork III. Reference Guide to EDWork Software
Wein, Ondřej
2009 - English
A reference guide to EDWork, a software for controlling, calibrating, and adjusting the device EDIK2 for electrodiffusion measurements, as well as the acquisition and treatment of the resulting electrodiffusion dat. Referenční příručka k EDWork, což je software ke kalibraci, adjustaci a řízení elektrodifuzního přístroje EDIK2, stejně jako pro sběr a zpracování výsledných elektrodifuzních dat.
Keywords:
electrodiffusion technique; device EDIK; digital-analog hybrid
Available at various institutes of the ASCR
EDWork III. Reference Guide to EDWork Software
A reference guide to EDWork, a software for controlling, calibrating, and adjusting the device EDIK2 for electrodiffusion measurements, as well as the acquisition and treatment of the resulting ...
EDWork Manual III. Reference Guide to EDWork 4. software
Wein, Ondřej; Sobolík, Václav
2009 - English
The report would serve as a guide to EDWork 4. software.
Keywords:
electrodiffusion technique; edwork manual; software
Available at various institutes of the ASCR
EDWork Manual III. Reference Guide to EDWork 4. software
The report would serve as a guide to EDWork 4. software.
High-pressure Emulsificationin Micromixers
Křišťál, Jiří; Preziosi, V.; Simoncelli, A.
2009 - English
An image processing procedure for analyzing the results of the high-pressure emulsification was developed. Based on the results the model for prediction of the drop diameter was formulated. Additional experiments are proposed to further validate the theory.
Keywords:
micromixers; emulsification; high-pressure
Available at various institutes of the ASCR
High-pressure Emulsificationin Micromixers
An image processing procedure for analyzing the results of the high-pressure emulsification was developed. Based on the results the model for prediction of the drop diameter was formulated. Additional ...
Surfactant Dissolution Using High Pressure Micromixer In-line Spectrometry at Pilot Scale Flow Rates
Křišťál, Jiří; Simoncelli, A.
2009 - English
We report that the highly viscous paste can be dissolved very quickly and efficiently in microSAR mixers with very low pressure losses. Inline measurements, including spectroscopy, in the HP rigs was easily organized by reapplication of the FMU elements.
Keywords:
micromixer; flow rates; spectrometry
Available at various institutes of the ASCR
Surfactant Dissolution Using High Pressure Micromixer In-line Spectrometry at Pilot Scale Flow Rates
We report that the highly viscous paste can be dissolved very quickly and efficiently in microSAR mixers with very low pressure losses. Inline measurements, including spectroscopy, in the HP rigs was ...
Standard Operating Procedure FMU Data Management
Křišťál, Jiří; Maes, P.
2009 - English
Standard operating procedure was developed to establish the correct data management procedure for the FMU trials and subsequent data analysis and result evaluation.
Keywords:
fmu data management; standard operating
Available at various institutes of the ASCR
Standard Operating Procedure FMU Data Management
Standard operating procedure was developed to establish the correct data management procedure for the FMU trials and subsequent data analysis and result evaluation.
Dissolution of Xanthan Gum with High-pressure microSARS Mixers
Křišťál, Jiří; Tideman, A.; Simoncelli, A.
2009 - English
Dissolution of Xanthan Gum powder was tested in micro static mixers. No technical issues were encountered concerning the application of micro mixers for the powder dissolution. For deeper understanding of dissolution mechanism further experiments and detailed rheological investigation is suggested.
Keywords:
microsars mixers; xantham gum; dissolution
Available at various institutes of the ASCR
Dissolution of Xanthan Gum with High-pressure microSARS Mixers
Dissolution of Xanthan Gum powder was tested in micro static mixers. No technical issues were encountered concerning the application of micro mixers for the powder dissolution. For deeper ...
Chinon Production Using High Pressure Micromixer
Křišťál, Jiří; Simoncelli, A.; Shimamoto, M.; Yokogi, J.
2009 - English
We report on the oil-water emulsification in high-pressure micromixer. Results of microscopy characterization, rheology and d-space analysis are reported.
Keywords:
micromixer; chinon; high pressure
Available at various institutes of the ASCR
Chinon Production Using High Pressure Micromixer
We report on the oil-water emulsification in high-pressure micromixer. Results of microscopy characterization, rheology and d-space analysis are reported.
NRGL provides central access to information on grey literature produced in the Czech Republic in the fields of science, research and education. You can find more information about grey literature and NRGL at service web
Send your suggestions and comments to nusl@techlib.cz
Provider
Other bases