Results 171 to 180 of about 2,141 (211)
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Surface Runoff Losses of Copper and Zinc in Sandy Soils
Journal of Environment Quality, 2003ABSTRACTIncreased anthropogenic inputs of Cu and Zn in soils have caused considerable concern relative to their effect on water contamination. Copper and Zn contents in surface soil directly influence the movement of Cu and Zn. However, minimal information is available on runoff losses of Cu and Zn in agricultural soils, and soil‐extractable Cu and Zn ...
Mingkui, Zhang +4 more
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An optimum ratio of copper losses and iron losses for a transformer with variable load
Proceedings of the IEE Part C: Monographs, 1960When a power transformer is loaded so that it is operating at maximum efficiency the copper losses are equal to the iron losses The ‘efficiency’ is, of course, the ‘power efficiency’, i.e. the ratio of output power to input power. The same condition applies for maximum ‘energy efficiency’ only if the load is constant for the period being considered ...
G.S. Brosan, D.O. Bishop
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Urinary zinc, copper, nitrogen, and potassium losses in response to trauma
Journal of Parenteral and Enteral Nutrition, 1979The urinary losses of zinc, copper, nitrogen and potassium were measured for 14 trauma patients for periods ranging from nine to 30 days and for nine normal subjects over four days each. The mean losses per day as well as peak losses by patients were compared to the mean normal losses.
A, Askari, C L, Long, W S, Blakemore
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Copper loss from the copper T model TCu22OC.
Contraception, 1983The effect of mineral deposits on the copper dissolution rate of the Copper T Model TCu22OC was examined. 118 Copper T22OC devices removed from subjects for various medical and personal reasons after 12 to 72 months in utero were examined and graded based on the proportion of the total copper area covered with mineral deposits.
M, Thiery, F, Schmidt, H J, Tatum
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Copper Loss Analysis of EV Charging Coupler
IEEE Transactions on Magnetics, 2015Electric vehicles numbers are increasing but they still have issues with range between charges. Battery pack energy density is still low compared to the density of fossil fuel so it is advantageous to offer more recharging windows. This will also reduce consumer “range anxiety”.
Shuo Wang, David G. Dorrell
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Secondary-electron and energy-loss spectra of copper
Surface Science, 1992Abstract The spectra of secondary electrons from copper show structure up to a kinetic energy of 300 eV, analogous to features observed in electron energy loss spectroscopy. We report EELS and SE data, up to 300 eV, obtained for a Cu(100) surface in order to show that they both are closely related to the unoccupied DOS.
P. Aebi +3 more
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Permittivity and loss tangent of copper filled epoxy
Proceedings of Conference on Electrical Insulation and Dielectric Phenomena - CEIDP '96, 2002The influence of filler particle size and shape on the permittivity and loss tangent of an epoxy composite was investigated. Three types of copper filler were used: large sphere, small sphere, and small flake. The amount of filler was varied from 0 to 15 volume percent and the dielectric properties were investigated at 1 kHz.
N.E. Frost, P.B. McGrath
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Copper losses in power integrated inductors on silicon
Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344), 2003One of the major goals in power electronics is the integration of the passive and active part of converters, on the same piece of silicon. In this context, our laboratory works on magnetic components integration. To have the right dimensioning of these components, we firstly have to choose the best topology regarding losses. The aim of this paper is to
J.M. Boggetto +3 more
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Copper clustering and vacancy loss during the quenching of aluminium-copper alloys
Acta Metallurgica, 1966Abstract The time taken to quench specimens of aluminium-copper alloys in wire form and their subsequent ageing rates have been determined using electrical resistance measurements. It was found that the quenching speed was proportional to the square of specimen radius and that the observed quenching times were the sum of the time taken to cross the ...
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