OxygenStellar EvolutionTwo problems concerning the equation of state for white dwarfs and supergiant planets, under the conditions of high densities and low temperatures, are considered. The first problem deals with the energy levels of electrons in the case of extreme pressure ionization, and the ...
Oxygen-containing carbons are promising supports and metal-free catalysts for many reactions. However, distinguishing the role of various oxygen functional groups and quantifying and tuning each functionality is still difficult. Here we investigate the r
where δ18Oca is the carbonate oxygen isotope values from Sanbao Cave11. Here we assume the carbonate δ18O record in Sanbao Cave is representative of precipitation oxygen isotope composition, and omit the combined effect of air temperature on precipitation δ18O values and of cave temperature on...
Hard carbon precursors are typically oxygen-rich organic material (Table S1). One source of such materials is plant-derived matter, including sucrose, glucose, cellulose, and lignin. Cellulose in this case being considered a broad ‘umbrella’ term that encompasses all its different varieties: hemi...
1. Unicellular algae possessing a hydrogenase system (Scenedesmus and other species), and having been adapted by anaerobic incubation to the hydrogen metabolism, reduce oxygen to water according to the equation O(2) + 2H(2) --> 2H(2)O. 2. The oxyhydrogen reaction proceeds undisturbed only ...
(1) and (4) gives the functional form of the equation for the thermal conductivity of CBCF as h. = XAIT(e'Q + 2.160 x lO-l1T3 Equation (5) was fitted to experimental data for the thermal conductivity of CBCF heat treated at various temperatures for 10, 15, and 20 seconds, and ...
Cao et al. (2011) established a regression equation based on limestone dissolution rate, precipitation, soil respiration rate and net primary productivity, and estimated that the karst carbon sink in the Pearl River Basin is 1.85 Tg C/a, considering the distribution of carbonate rock types as ...
1d) indicated that the main elements of the graph paper were carbon and oxygen, which were the main elements of the cellulose fibers. The flat graphite films with different resistances, as the gradient resistance elements, were obtained easily by pencil repeatedly drawing on the graph paper. ...
35. Because NO2−incorporates oxygen atoms from water30, the δ18O–H2O signal of seawater is incorporated into N2O from NO2−. In addition, NO2−at the PNM layer is usually depleted in15N, that is, −0.39 ± 3.45‰ (Supplementary Table6), which is lower than the reported...
the entire time of the simulation, or the time it took for a particle to hit a boundary, respectively. Because the mean sequestration time is a function of the expected length of time for floats that did not reach the mixed layer during the simulation, we solved this equation iteratively, ...