No (142)
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142
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to
Fish stock assessment of the Ebro Reservoir in 2009
Kratochvíl, Michal; Prchalová, Marie; Kubečka, Jan; Jůza, Tomáš
2010 - English
Keywords:
fish community composition; fish distribution; gillnetting; trawling
Available at various institutes of the ASCR
Fish stock assessment of the Ebro Reservoir in 2009
Voltage-step Transient in Redox Systems II. 1D Approximation (revisited)
Wein, Ondřej
2010 - English
Using the well-known Cottrell asymptote, voltage-step transient experiment could provide data on bulk concentration and diffusion coefficient of working depolarizer, essential in the liming-current techniques. However, the Cottrell asymptote is not directly applicable in an early stage of the voltage-step transient process,. There are three additional transport resistances that cannot be neglected at extremely high initial currents: Faradaic resistance at surface of working electrode, Ohmic losses in its intimate neighborhood, and the galvanometric constraint in the outer circuit (galvanometer, current follower, potentiostat). Non-linear effect of these additional transport resistances on the transient current is calculated in a 1D approximation, i.e. assuming uniform accessibility of the working electrode, for finite voltage steps.
Keywords:
voltage-step transient; cottrell asymptote; ohmic loss
Available at various institutes of the ASCR
Voltage-step Transient in Redox Systems II. 1D Approximation (revisited)
Using the well-known Cottrell asymptote, voltage-step transient experiment could provide data on bulk concentration and diffusion coefficient of working depolarizer, essential in the liming-current ...
The Next Flexible microPROCESSING Unit (FMU2) is Getting a Face
Maes, P.; Křišťál, Jiří
2010 - English
The report states the current status of the upgrade of the flexible microprocessing unit.
Keywords:
microreactors; process intesification; SO2 oxidation
Available at various institutes of the ASCR
The Next Flexible microPROCESSING Unit (FMU2) is Getting a Face
The report states the current status of the upgrade of the flexible microprocessing unit.
Design of Connectors for the High-Pressure Micromixers Testing at Pilot Plant Scale
Křišťál, Jiří; Pellens, L.
2010 - English
The report describes the desing of standardized connectors for the connection of various micromixers to the high-pressure rig in order to carry out the experiments at the pilot plant flow rates.
Keywords:
high-pressure connectors; micromixers; experiments
Available at various institutes of the ASCR
Design of Connectors for the High-Pressure Micromixers Testing at Pilot Plant Scale
The report describes the desing of standardized connectors for the connection of various micromixers to the high-pressure rig in order to carry out the experiments at the pilot plant flow rates.
Fish stock assessment of the Aracena Reservoir in 2009
Kratochvíl, Michal; Prchalová, Marie; Kubečka, Jan; Jůza, Tomáš
2010 - English
Keywords:
fish community composition; fish distribution; gillnetting; trawling
Available at various institutes of the ASCR
Fish stock assessment of the Aracena Reservoir in 2009
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 ...
Report on acoustic fish stock assessment of Neusiedlersee, August 2006
Draštík, Vladislav; Kubečka, Jan
2010 - English
Keywords:
hydroacoustic monitoring survey; split beam echosounder; fish abundance
Available at various institutes of the ASCR
Report on acoustic fish stock assessment of Neusiedlersee, August 2006
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 ...
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