The Ti/SnO2+Sb2O3/PbO2 anode with SnO2+Sb2O3 intermediate layer obtained by the polymeric precursor method (PPM) and with the conventional route was studied. The morphology and microstructure of SnO2+Sb2O3 intermediat...The Ti/SnO2+Sb2O3/PbO2 anode with SnO2+Sb2O3 intermediate layer obtained by the polymeric precursor method (PPM) and with the conventional route was studied. The morphology and microstructure of SnO2+Sb2O3 intermediate layer derived from different precursors and the top PbO2 active layer were examined by means of ESEM and XRD. The lifetime and electrocatalytic activity of the anode were also assessed by the cyclic voltammetry and accelerated lifetime test in 1.0 mol/L H2SO4 solution. It was found that precursor solvents affected lifetime, microstructure and morphology of the anode, and had little influence on electrocatalysis activity of the electrodes. The accelerated lifetime of Ti/SnO2+Sb2O3/PbO2 anode with intermediate layer prepared by PPM was 29.5 h in 1.0 mol/L H2SO4 solution, which was respectively about four times and twice that of the anode prepared with ethylene glycol and ethanol. After the anode was subjected to thermal corrosion, the lifetime still reached 27 h in contrast to the others.展开更多
In this study, the moving velocitiy of precursor solitons, of the flow in depressed region, and of the zero-crossing of the trailing wavetrain relative to the moving disturbance for single-layer flow over topography w...In this study, the moving velocitiy of precursor solitons, of the flow in depressed region, and of the zero-crossing of the trailing wavetrain relative to the moving disturbance for single-layer flow over topography were theorecticaly determined in terms of the mass and energy conservation theorems, and were examined with numerical calculations showing good agreement with theoretical results.展开更多
It is a common phenomenon that there exists shallow geotemperature rise precursor around an earthquake region before the event occurs. The existing models on geotemperature precursor mechanism such as the deep thermal...It is a common phenomenon that there exists shallow geotemperature rise precursor around an earthquake region before the event occurs. The existing models on geotemperature precursor mechanism such as the deep thermal ascent model and the model of hothouse effect, all encounter some contradictions although there is a certain evidence supporting them. From the angle of dissipative heat in the present paper, we set forth a new interpretation model named the stress-dissipative heat model with the main points of view as: the dissipative heat transformed from the work of crustal stress to non-elastic deformation of rock and soil, is one important reason for preseismic geotemperature rise. The medium-term regional and tendency geotemperature rise before an earthquake closely relates to the intensification of regional crustal stress field; the short-term and prequake geotemperature bursting rise around an earthquake region closely relates to rapid change of the source stress field. Plastic deformation and dissipative heat is much easier created in soil than rock. Therefore, the pre-earthquake geotemperature precursors mainly appear in soil covered area and mostly concentrate in shallow soil layers.展开更多
基金Supported by the National Natural Science Foundation of China (No. 20176047)
文摘The Ti/SnO2+Sb2O3/PbO2 anode with SnO2+Sb2O3 intermediate layer obtained by the polymeric precursor method (PPM) and with the conventional route was studied. The morphology and microstructure of SnO2+Sb2O3 intermediate layer derived from different precursors and the top PbO2 active layer were examined by means of ESEM and XRD. The lifetime and electrocatalytic activity of the anode were also assessed by the cyclic voltammetry and accelerated lifetime test in 1.0 mol/L H2SO4 solution. It was found that precursor solvents affected lifetime, microstructure and morphology of the anode, and had little influence on electrocatalysis activity of the electrodes. The accelerated lifetime of Ti/SnO2+Sb2O3/PbO2 anode with intermediate layer prepared by PPM was 29.5 h in 1.0 mol/L H2SO4 solution, which was respectively about four times and twice that of the anode prepared with ethylene glycol and ethanol. After the anode was subjected to thermal corrosion, the lifetime still reached 27 h in contrast to the others.
文摘In this study, the moving velocitiy of precursor solitons, of the flow in depressed region, and of the zero-crossing of the trailing wavetrain relative to the moving disturbance for single-layer flow over topography were theorecticaly determined in terms of the mass and energy conservation theorems, and were examined with numerical calculations showing good agreement with theoretical results.
文摘It is a common phenomenon that there exists shallow geotemperature rise precursor around an earthquake region before the event occurs. The existing models on geotemperature precursor mechanism such as the deep thermal ascent model and the model of hothouse effect, all encounter some contradictions although there is a certain evidence supporting them. From the angle of dissipative heat in the present paper, we set forth a new interpretation model named the stress-dissipative heat model with the main points of view as: the dissipative heat transformed from the work of crustal stress to non-elastic deformation of rock and soil, is one important reason for preseismic geotemperature rise. The medium-term regional and tendency geotemperature rise before an earthquake closely relates to the intensification of regional crustal stress field; the short-term and prequake geotemperature bursting rise around an earthquake region closely relates to rapid change of the source stress field. Plastic deformation and dissipative heat is much easier created in soil than rock. Therefore, the pre-earthquake geotemperature precursors mainly appear in soil covered area and mostly concentrate in shallow soil layers.
