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In general, the ORR activity can be presented as the I = nFK cO2(1–θad)x exp(–βFE/RT) exp(–γ∆Gad/RT) (2) where i is the measured current density, n is the number of electrons, K is the rate constant, x is the order of active sites, β and γ are symmetry factors...
Tohf easemtienceh.niques integrate excavation and mining operations, are highly automated and flexible, require minimal upfront investment, and can (1) Thbee rtaepcihdnlyicdaelpslyosyteedm, wfohricShBsMubstantially enhances the recovery rate of a mine. A(1c)laTsshiectteecchhnniciaclaslyssy...
The temperature field is determined from a surface temperature of 15 ◦C and a common geothermal gradient of 30 ◦C/km. This model is assumed to be isothermal. The hydraulic head can be converted from pressure according to Equation (1). The fluxes at the southern and partial eastern ...
For turbulent flow in pipelines, as well as in open and external flow, the friction can be reduced by introducing a minor quantity of a flexible, linear polymer with a high molecular weight into the flow [3]. This behavior is termed the polymer-induced turbulent drag reduction (DR) effect...
(2) The softening model based on the classic rock damage model can better simulate the stress–strain relationship of the silt–steel interface under high normal stress and low water content. In contrast, the hardening model based on the classic hyperbola model can better simulate the stress–...
the finite volume of groundwater that aquifers can store that is in- nately limited by their geophysical parameters; (ii) natural recharge of aquifers that are controlled by precipitation and climate; (iii) fluxes required to maintain vital environ- mental functions; (iv) whether allowed and/or...
Therefore, energy production accounts for actual flow rate and head variability over the year. The conversion efficiency is also estimated, for both the whole water distribution network and the PAT alone. Keywords: pump as turbine; pump; water distribution network; hydraulic energy; efficiency 1. ...
Keywords: optimization; solar water heating system; time and spatial partition heating; continuous and whole space heating; passive solar houses; TRNSYS 1. Introduction With the increasing rate of urbanization in China, the requirements for indoor thermal environment have improved with the gradual ...
By applying Kcr to both, an ideal reference crop and the monitored crop, the difference between these two can be translated into crop water stress. This approach is quite significant as it provides crop coefficients (Kc) for each stage of the crop rather than providing a static estimate of ...