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Edge Effects in Voltage-step Transient I. Ohmic Losses in 1D Approximation (revisited)
Wein, Ondřej
2010 - English
Ohmic potential drop between the working and reference electrodes plays an important role in the early stage of the voltage-step transient process. Non-linear effect of the ohmic drop on the transient currents has been calculated for large voltage steps, assuming reversible behavior (negligible surface overpotential) of a redox couple O + ne = R. This report extends an older study by Wein (1991). In particular, it adds a series of analytic approximations and gives more accurate numerical solving.
Keywords:
voltage-step transient; ohmic loss; cottrell asymptote
Available at various institutes of the ASCR
Edge Effects in Voltage-step Transient I. Ohmic Losses in 1D Approximation (revisited)
Ohmic potential drop between the working and reference electrodes plays an important role in the early stage of the voltage-step transient process. Non-linear effect of the ohmic drop on the transient ...
Project Report Beneficiary No.17 ICPF Reporting Period: Month 01 to 12 (01 June 2009 to 31 May 2010)
Křišťál, Jiří; Stavárek, Petr; Jiřičný, Vladimír
2010 - English
To assess the current state of the art in sulphur dioxide oxidation an extensive literature review including scientific papers, patents and books was started. The literature review is focused on following topics: operation parameters, flow rate, concentration of substrates and impurities, kinetics, catalyst characterization, reaction mechanism and apparatus. Extracted information were evaluated and organized in the form of a data matrix.
Keywords:
microreactor; SO2 oxidation; process intesification
Available at various institutes of the ASCR
Project Report Beneficiary No.17 ICPF Reporting Period: Month 01 to 12 (01 June 2009 to 31 May 2010)
To assess the current state of the art in sulphur dioxide oxidation an extensive literature review including scientific papers, patents and books was started. The literature review is focused on ...
Final Report on Microprocessing of Fluids 2009 – 2010
Křišťál, Jiří
2010 - English
The final report summarizes the work carried out with the research agreement no. 170306.
Keywords:
microprocessing; complex fluids; fundamental understanding
Available at various institutes of the ASCR
Final Report on Microprocessing of Fluids 2009 – 2010
The final report summarizes the work carried out with the research agreement no. 170306.
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.
Aspekty škodlivých složek bioplynu na vlastnosti ocelových lahví
Kaštánek, František
2009 - Czech
Zpráva obsahuje kritické zhodnocení známých technologických postupů čištění bioplynu po fermentaci, přehled nákladů na samostatné technologie čištění a přehled dodávajících firem. The report contents the evaluation of known technological procedures of the cleaning of biogas from the fermentation process, the summary of costs of cleaning technologies and the survey of supplier companies.
Keywords:
biogas; cleaning; fermentation process
Available at various institutes of the ASCR
Aspekty škodlivých složek bioplynu na vlastnosti ocelových lahví
Zpráva obsahuje kritické zhodnocení známých technologických postupů čištění bioplynu po fermentaci, přehled nákladů na samostatné technologie čištění a přehled dodávajících firem....
Expozice občanů a zaměstnanců MHD polycyklickým aromatickým uhlovodíkem (PAU) obsaženým v ovzduší při cestování tramvají v Praze
Tydlitát, Vratislav; Kotlík, B.; Mikešová, M.
2009 - Czech
Při znečištění se uplanují emise z vozidel při častém souběhu tramvajové linky a dopravní komunikace. Je odhadnuta míra exposice účastníka tramvajové dopravy polycyklickým aromatickým uhlovodíkem a aerosolovými částicemi PM10, PM2.5 a PM1. Concentration of PAHs, the number of aerosol particles of wide size spectrum, mass content of PM10 , PM2,5 and microclimatic parameters in atmosphere of Prague tram were measured in november 2008 and may 2009 on ost/west and south/nord lines. Concentration of PAHs TEFs does not overstep 30% over recomended limit 1ng.m-3. Mean concentration of PM10 during 8 hours oversteps permitted limit 50 g.m-3 more than three times, at PM2,5 oversteps the limit two times. At pollution asserts oneself emissions from vehicles at frequent parallel tram lines and transport lines. It is estimate the measure of exposure of the participant of tram tarffic to polycyclic aromatic hydrocarbons and to aerosole particles . PM10 , PM2,5 a PM1.
Keywords:
aerosol particles; concentration; atmosphere
Available at various institutes of the ASCR
Expozice občanů a zaměstnanců MHD polycyklickým aromatickým uhlovodíkem (PAU) obsaženým v ovzduší při cestování tramvají v Praze
Při znečištění se uplanují emise z vozidel při častém souběhu tramvajové linky a dopravní komunikace. Je odhadnuta míra exposice účastníka tramvajové dopravy polycyklickým aromatickým uhlovodíkem a ...
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.
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