Decomposition long-term experiments

It was observed in other works that in sulfide electrolyte, decomposition of ZnSe was still obtained stable PECs could be constructed though from singlecrystal, n-type, Al-doped ZnSe electrodes and aqueous diselenide or ditelluride electrolytes [124]. Long-term experiments in these electrolytes were accompanied by little electrode weight loss, while relatively constant photocurrents and lack of surface damage were obtained, as well as competitive electrolyte oxidation. Photoluminescence and electroluminescence from the n-ZnSe Al electrodes were investigated. 

Thus the degree of OM decomposition, amounting to 70—80% of the initial amount (at 20°C) in the long-term experiment, is close to that in wata bodies containing hydrogen sulphides it is evidently lower for the oxygen-containing ones. 

The knowledge on evaporation and thermal stability of supported ILs is still at its infancy, and more combinations of ILs and solids should be investigated. Until now, the knowledge on the decomposition products is also limited, and more research is needed by techniques such as NMR or IR. In future, also long-term experiments with supported ILs in a fixed bed with a throughput of a gas at ambient... 

Only in a couple of long-term experiments was seal degradation observed, and this might have been the consequence of an inappropriate materials selection. Silicone seals in direct contact with a perfluorosulfonic acid membrane suffer from degradation, at the anode as well as at the cathode [84]. The degradation is probably caused by acidic decomposition of the sealing material, leading to... 

In addition to long-term and large-scale climatic effects, the annual variation in weather conditions also affected the amount and turnover of plant residues and thus the chemical composition SOM sampled at a certain date (Leinweber et al., 1994, 1995). Figure 14.19 shows the ion intensities for carbohydrates in two plots of the Eternal Rye Cultivation experiment at Halle, Saxony-Anhalt, Germany. In 1958, parts of the former rye monoculture were shifted into maize monoculture. This resulted in decreases in the ion intensities for carbohydrates. In the plot that remained under rye monoculture the ion intensities for carbohydrates increased initially. For several time periods, the changes in ion intensities were roughly parallel for the two plots, which is considered as evidence for annual variations in the decomposition dynamics. For some time (1993 to 1997), there was no significant difference between the rye and maize plots in the ion intensities for carbohydrates, but the... 

In all the experiments and thermodynamic calculations, it was assumed that carbon monoxide was stable at the time of decomposition of iron carbonate and was removed from the rocks being metamorphosed. Nor were possible secondary reactions in the case of oxidation of FeC03 by water taken into account—the result of the reactions would be the formation of some CO, CH4 and more complex hydrocarbons. Such assumptions are valid in examining the results of short-term experiments in which metastable carbon monoxide arises and does not undergo subsequent decomposition. However, in long-term natural processes the establishment of complete equilibrium between all the components of the gas phase, with the decom-... 

Early on, the differences in the products from radiolysis of water were noticed. It was found, as mentioned above, that the radiolysis of pure water seemed to lead to almost no damage. If there were impurities in the water, radiation damage would occur. However, irradiation by high LET radiation would clearly lead to the formation of hydrogen. Further experiments showed that if one irradiated a sealed sample with high-LET radiation, and then the sample was irradiated with a low-LET source, the gas formed by the radiation would then disappear and it would appear as if there were no long-term decomposition. These data were part of the reason that A. O. Allen proposed the theory of radiation chemistry where back reactions occurred. ... 

A major departure occurs in the NIOSH definition of health class . NIOSH is concerned with both acute and low level long term exposure, perhaps for a lifetime, that a worker may experience, primarily occurring under normal work conditions. NIOSH is not directly concerned with the decomposition or combustion products (as NFPA is) of chemicals unless they constitute the normal exposure of a worker. There is greater concern with chronic effects. 

The AuATi02 catalyst was also tested concerning its hydrothermal resistivity under authentic operating conditions and its behavior after modeled long-term poisoning by sulfur compounds. In all aging experiments, the catalyst performance even after severe treatment such as hydrothermal aging at up to 850 °C or 200 ppm of SO2 in the gas feed still maintamed acceptable activity for catalytic decomposition of NH3 precursor compounds [113]. 

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