摘要 :
Based on the statistical analysis on the emission of main air pollution sources, ADMS-Urban was used to simulate the distribution of SO2 concentration in the Shanghai Expo area. The effects of wind direction, wind speed, clouds co...
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Based on the statistical analysis on the emission of main air pollution sources, ADMS-Urban was used to simulate the distribution of SO2 concentration in the Shanghai Expo area. The effects of wind direction, wind speed, clouds coverage and rainfall on the emission of SO2 concentration were investigated. The results show that the Yangshupu power plant gave the most contribution to SO2 concentration in the Shanghai Expo planning area. Clouds coverage can restrain the dispersion of the air pollutants, while rainfall can wash them away reducing the pollutants concentration more effectively than the former. It has also been found that at the wind direction of 36.8° or 190.8°, the SO2 concentration in the Shanghai Expo planning area exceeded the standards, the air quality in the Shanghai Expo planning area is the worst.
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The electric initiator is wildly used in the ammunition. The performance of the electric initiator after many years of storageis very important in China. In the present paper, the performance such as firing, sensitivity, delaying ...
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The electric initiator is wildly used in the ammunition. The performance of the electric initiator after many years of storageis very important in China. In the present paper, the performance such as firing, sensitivity, delaying time and output of a kind ofelectric initiator is studied by aging test. The relationship between the performance parameter and the storage life of initiator isanalyzed. The results show that material erode is more important to the life of the initiator.
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There are many influencing factors in the reduction of iron by melts electrolysis of LiFePO_4. Thermodynamic analysis is used to study the influence of drying, sintering, and melts on LiFePO_4: the change is not obvious when dryin...
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There are many influencing factors in the reduction of iron by melts electrolysis of LiFePO_4. Thermodynamic analysis is used to study the influence of drying, sintering, and melts on LiFePO_4: the change is not obvious when drying LiFePO_4 at 150°C under vacuum conditions; sintering LiFePO_4 at 150-750 °C, the oxidation reaction of Li_3Fe_2(PO_4)_3 and Fe_2O_3 begins to occur when the temperature reaches 350 °C; the reaction of LiFePO_4 to Ca2PO_4Cl and Ca_5(PO_4)_3Cl occurs in the NaCl-CaCl_2 melts at 600-800 °C. The higher the temperature, the more violent the reaction. Fe and Li are dissolved in molten salt in the form of FeCl_2 and LiCl.
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The high productivity blended acquisition technique greatly improves the acquisition efficiency. However, this technology also introduces serious interference noise from adjacent sources. An efficient data deblending method based ...
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The high productivity blended acquisition technique greatly improves the acquisition efficiency. However, this technology also introduces serious interference noise from adjacent sources. An efficient data deblending method based on sparse inversion is used to separate the simultaneous sources for offshore 3D DAS VSP data. Due to the difference in coherence between main source and blended noise on the time- space common receiver point gathers, which can be expressed by the sparsity in the FKK domain, we can solve the effective signal by imposing additional constraints on the unknown signal model. The signal model with gradually improved signal-to-noise ratio can be obtained by subtracting interference noise from simultaneous sources. The method has been proved to be efficient and useful in separating the main source from the interference noise by using the Offshore 3d DAS VSP data. It should be pointed out that this method is not applicable to the data acquired in the area with irregular spatial distribution of shot points because this method requires 3D FKK transformation of common receiver point data.
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The main and control circuit of CO_2 welding power, which is mode of full-bridge and IGBT inverter, is designed based on DSP (Digital Signal Processor). The designing include sub-modules based on DSP such as the sampling signal ci...
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The main and control circuit of CO_2 welding power, which is mode of full-bridge and IGBT inverter, is designed based on DSP (Digital Signal Processor). The designing include sub-modules based on DSP such as the sampling signal circuit, the control circuit for external characteristics, the PWM (Pulse-Width -Modulation) control circuit of welding inverter, the IGBT drive circuit and etc. This designing can strengthen the reliability of feedback regulation property on CO_2 inverter welding power can enhance the stability of the parameters from the power system. The experimental result shows that the inverter welding power has good feedback regulation and stability properties during the CO_2 welding process.
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Using TiO_2 particles obtained by hydrolysis of titanium oxysulfate as the precursor, polystyrene (PS) microspheres as the template, TiO_2/PS complex particles were successfully deposited on Ti substrates through layer-by-layer se...
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Using TiO_2 particles obtained by hydrolysis of titanium oxysulfate as the precursor, polystyrene (PS) microspheres as the template, TiO_2/PS complex particles were successfully deposited on Ti substrates through layer-by-layer self-assembly technique and the surfactant-assisted process at low temperature. Then removed PS spheres by two methods, TiO_2 hollow spheres were attained. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed to characterize the synthesized materials. The results showed that the crystallization, structure and surface morphology of TiO_/PS on the surface have a great relationship with the pH value of treating solution. Diversity effects on surface integrity and bioactive of hollow spheres happened due to different ways of removing PS core.
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