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Studies of the anodic oxidation of 4-alkoxylbiphenyls and the chemistry of p̲-quinol ether ketals /DeSchepper, Richard Edward January 1987 (has links)
No description available.
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An electrochemical approach to refractory-slag corrosion /Videtto, Ralph Benjamin,1943- January 1970 (has links)
No description available.
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Direct cobalt recovery from loaded KELEX 100 by reaction with hydrogenStubina, Nathan M. January 1982 (has links)
No description available.
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Electrochemical reductions of diphenyldiazomethane and azobenzene: the effect of electroinactive proton donorsCheng, Spencer Shu-Tsu. January 1986 (has links)
Call number: LD2668 .T4 1986 C443 / Master of Science / Chemistry
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Mathematical modeling of solid oxide steam electrolyzer for hydrogen productionNi, Meng., 倪萌. January 2007 (has links)
published_or_final_version / abstract / Mechanical Engineering / Doctoral / Doctor of Philosophy
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Galvanic interactions between minerals during dissolutionHolmes, Paul Richard January 1994 (has links)
A dissertation submitted to the Faculty of Engineering, University of the
Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of
Master of Science in Engineering
Johannesburg, 1994 / A quantitative description of galvanic interactions between sulphide minerals based
on thermodynamic and kinetic parameters has been developed. The basis for
quantitative description involves conducting a voltage balance over the galvanic
couple. The contributions to the voltage balance include the galvanic couple cell
emf, kinetic descriptions of the anodic and cathodic half reactions, the voltage
characteristics 'of mineral-mineral contacts and solution voltage losses. The rates of
the anodic and cathodic half' reactions were modelled by the Butler-Volmer equation
and ti1ediffusion equation. A potentiostat was used to vary the voltages losses across
mineral-mineral contacts. TIle galvanic couples were constructed. as rotating ring disc
electrodes and hence electrolyte voltage losses were negligible. Three galvanic
couples, copper-platinum, copper-pyrite and galena-pyrite, were electrochemically
characterised under different conditions of ferric concentration, electrode rotation
rate and temperature. The effect of illumination on the anodic dissolution of galena
was investigated. The electrochemical model is in good agreement with
experimentally measured galvanic currents. Galvanic interaction is a dynamic
function and various models are developed which account for dynamic behaviour in
galvanic cells. / MT2017
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Electron-transfer processes : the electrochemical reduction of N,N-dimethyl- and p-cyanobenzenesulfonamideSantelices, Carlos G January 2011 (has links)
Digitized by Kansas Correctional Industries
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Effects of electrolytic machining conditions on the geometry and size of tungsten needleYeh, Chia-chi 20 August 2007 (has links)
In this study, an electrolytic micro-machining tester is employed to investigate the effects of the supply voltage, the immerse depth of tungsten rod, and the machining time on the current waveform, the material removal rate, and the geometry of the tungsten needle. The tungsten rod to be electrolyzed is dipped in an aqueous electrolyte of 10 wt% sodium hydroxide as the anode, and the stainless steel ring as the cathode. The spindle rotating speed and the stirring rotating speed are set to be 100 rpm and 200rpm, respectively. According to analyze the topography of the tungsten needle, four machined regimes have been identified as:¡]1¡^non-machined regime,¡]2¡^incomplete machined regime,¡]3¡^complete machined regime,¡]4¡^over machined regime. In order to obtain the perfect tungsten needle, the experiments are conducted in the complete machined regime.
Results show that the tungsten rod becomes a short cone for the immerse depth of 5 mm, and a long cone for the depth of 10mm. When the immerse depth of 10 mm and the supply voltage of 3V, the surface of tungsten needle becomes rough slightly and the tip radius of tungsten needle is about 2£gm. With increasing the supply voltage to 4.5 V, the surface of tungsten needle is uniform with a downward trend in material removal rate, and the tip radius can achieve a submicron. For the supply voltage of 6V, because the material removal rate varies violently, it becomes very difficult to control the diameter of tungsten needle. During the machining time between 0 to 10 min for the supply voltage of 4.5V, the diameter of tungsten rod is decreased from 1000 to 200£gm, but during the machining time between 10 to 12.5 min, the tungsten rod gradually transforms into the needle due to a downward trend in current, and the tip radius is decreased from 200£gm to submicron. Hence, the machining time must be controlled accurately to manufacture the needle in a submicron radius.
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Electrolytic Methods as a Cost and Energy Effective Alternative of Harvesting Algae for BiofuelMorrison, Taylor 1986- 14 March 2013 (has links)
Process variables of electrolytic technology to reduce the energy consumption of harvesting Nonnocloropsis salina were investigated including electro-coagulation, electro-floatation, and electro-flocculation. Electro-coagulation and electro-flocculation showed significant cost savings, however electro-floatation did not. The objectives were to determine the effects of electrode material, pH adjustment and electro-polymer addition for electro-coagulation and determine the performance characteristics for electro-coagulation and electro-flocculation. Both treatments proved to be competitive with the energy consumption of a centrifuge. The best electrolytic treatments were electro-coagulation with aluminum and nickel electrodes. Energy requirements at optimum conditions were 239 and 344 kWh/ton. The best treatment combination using electro-flocculation was 432 kWh/ton with no electrode consumption, which could lead to potential cost savings.
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A polarographic study of the reduction of unsymmetrical benzils.Sobieski, James F. 01 January 1967 (has links)
This investigation applied the techniques of polarography and controlled
potential electrolytic reduction to the study of a series of unsymmetrical benzils.
Eleven unsymmetrical benzils were synthesized and studied in 50% ethanol-water
(by volume) solvent systems buffered at pH 1, 5, and 13. The results showed that,
with unsymmetrical benzils substituted with electron-withdrawing or electrondonating
groups, the carbonyl closest to the ring with the least electron-donating
power was the preferred reaction site. However, the dicarbonyl system was nevertheless
reduced as a unit, and Hammett sigma values of disubstituted symmetrical
benzils were approximately additive. This was ascertained by comparing the ease
of reduction of eight unsymmetrical benzils to the ease of reduction of the corresponding
disubstituted symmetrical benzils. It was proposed that the electrons
were added to the oxygen of one carbonyl, and that the second carbonyl was involved
in the reduction chiefly through complete polarization of the dicarbonyl system
at the electrode.
In general, the reduction of unsymmetrical benzils appeared to follow the
same path previously reported for symmetrical benzils.
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