Noise reduction in a shop floor is one of the important parts of greenmanufacturing. In a shop floor machine tools are the main noise sources in a shop floor. A newapproach is discovered by investigation that the nois...Noise reduction in a shop floor is one of the important parts of greenmanufacturing. In a shop floor machine tools are the main noise sources in a shop floor. A newapproach is discovered by investigation that the noise can be obviously reduced in a shop floor byoptimizing the scheduling between work pieces and machine tools. Based on the discovery, a newmethod of noise reduction is proposed. A noise reduction scheduling model in a shop floor isestablished, and the application of the model is also discussed. A case is studied, which shows thatthe method and model are practical.展开更多
Thermal groundwater resources were found to have occurred in deep-seated bedrock aquifers in the northeastern North China plain near Tianjin, China. Meso- to Neo-Proterozoic and Paleozoic carbonate rocks on the Cangxi...Thermal groundwater resources were found to have occurred in deep-seated bedrock aquifers in the northeastern North China plain near Tianjin, China. Meso- to Neo-Proterozoic and Paleozoic carbonate rocks on the Cangxian uplift are capable of yielding 960-4 200 m 3/d of 60 to 96 ℃ water from the wells ranging in depth between 1 000 and 4 000 m. Conductive heat flow of 0.063 to 0.144 2 W/m 2 from the deep crust is responsible for this anomalous geothermal field. The water in the Ordovician aquifer is characterized by relatively high TDS, high concentrations of SO 4 and SO 4·Cl-Na·Ca type, but the waters from the Meso- to Neo-Proterozoic and Cambrian aquifers, by relatively low TDS, low concentrations of SO 4 and predominantly Cl·SO 4-Na type. It is noted that when the temperature of the waters increases at a rate of 10 ℃ in the range of 30-100 ℃, the content of SiO 2 increases at a rate of 12 to 15 mg/L, and fluoride concentration increases at a rate of 2.3 to 2.5 mg/L. Hydrochemical and isotopic data suggest that the thermal water in the bedrock aquifers is of meteoric origin and recharged in the northern mountain area to the north of the Baodi-Ninghe fault, and then flows laterally for a long distance from the north to the south to the city of Tianjin. Temperature of the waters increases because of heat exchange with the rocks and recharge by conductive heat flow from beneath.展开更多
M ANY people think of Wenzhou, whose many small commodities such as lighters, shoes and locks are well known the world over, as a commercial city. Shops line its streets, and Wenzhou people have such business acumen, ...M ANY people think of Wenzhou, whose many small commodities such as lighters, shoes and locks are well known the world over, as a commercial city. Shops line its streets, and Wenzhou people have such business acumen, they are popularly known as China's prize wheeler dealers. On arrival, however, the traveler discovers that commercial as it may be, Wenzhou展开更多
SUBTROPICAL Xishuangbanna, Yunnan Province is home to 13 ethnic minorities, including the Dai, Hani, Blang, Yi and Jino, all of whom go about their daily business clad in colorful folk costumes. Xishuangbanna resemble...SUBTROPICAL Xishuangbanna, Yunnan Province is home to 13 ethnic minorities, including the Dai, Hani, Blang, Yi and Jino, all of whom go about their daily business clad in colorful folk costumes. Xishuangbanna resembles a real-life Xanadu, far removed from temporal life. Of the ethnic minorities living here, Dai people have the longest history.展开更多
The kinetic and thermodynamic structure of typhoon Rammasun (No. 0205) over the Northwest Pacific has been analyzed, using NOAA-16 polar orbiting Advanced Microwave Sounding Unit (AMSU) data collected on 2 July, 2002....The kinetic and thermodynamic structure of typhoon Rammasun (No. 0205) over the Northwest Pacific has been analyzed, using NOAA-16 polar orbiting Advanced Microwave Sounding Unit (AMSU) data collected on 2 July, 2002. The three-dimensional variational (3DVAR) assimila-tion technology is used to assimilate the satellite observation. The results show that the characteristics of the 3D typhoon structure can be more reasonably described from the assimi-lated data. The warm-cored structure of the typhoon is en-hanced in the analyzed field, which corresponds to strong typhoon. The typhoon cyclonic circulation in the middle and lower layers is apparently strengthened, and the strong anti-cyclonic circulation appears at the top of the typhoon. The water vapor and its supply in the typhoon are enhanced. The microwave assimilation data may be used to supply the lack of the conventional observation data over the tropical ocean.展开更多
An equation of atomization quantity from energy dissipation by hydraulic jumpwas derived from dimensional analysis. Applying the Gauss diffusion equation, the spray diffusionin valley was studied under the conditions ...An equation of atomization quantity from energy dissipation by hydraulic jumpwas derived from dimensional analysis. Applying the Gauss diffusion equation, the spray diffusionin valley was studied under the conditions of continuous line source and random wind direction.Considering the spray-rain switching process, coagulation, condensation and evaporation of droplets,the authors calculated the air temperature, air relative humidity, spray density and the rainfallintensity in the lower reaches. The 3-D numerical results agree well with portotype monitoring data.展开更多
文摘Noise reduction in a shop floor is one of the important parts of greenmanufacturing. In a shop floor machine tools are the main noise sources in a shop floor. A newapproach is discovered by investigation that the noise can be obviously reduced in a shop floor byoptimizing the scheduling between work pieces and machine tools. Based on the discovery, a newmethod of noise reduction is proposed. A noise reduction scheduling model in a shop floor isestablished, and the application of the model is also discussed. A case is studied, which shows thatthe method and model are practical.
基金ThisworkisfundedbytheMinistryofEducationofChinafortheKeyProjectsofScienceandTechnologyResearch (No .0 2 0 2 6)
文摘Thermal groundwater resources were found to have occurred in deep-seated bedrock aquifers in the northeastern North China plain near Tianjin, China. Meso- to Neo-Proterozoic and Paleozoic carbonate rocks on the Cangxian uplift are capable of yielding 960-4 200 m 3/d of 60 to 96 ℃ water from the wells ranging in depth between 1 000 and 4 000 m. Conductive heat flow of 0.063 to 0.144 2 W/m 2 from the deep crust is responsible for this anomalous geothermal field. The water in the Ordovician aquifer is characterized by relatively high TDS, high concentrations of SO 4 and SO 4·Cl-Na·Ca type, but the waters from the Meso- to Neo-Proterozoic and Cambrian aquifers, by relatively low TDS, low concentrations of SO 4 and predominantly Cl·SO 4-Na type. It is noted that when the temperature of the waters increases at a rate of 10 ℃ in the range of 30-100 ℃, the content of SiO 2 increases at a rate of 12 to 15 mg/L, and fluoride concentration increases at a rate of 2.3 to 2.5 mg/L. Hydrochemical and isotopic data suggest that the thermal water in the bedrock aquifers is of meteoric origin and recharged in the northern mountain area to the north of the Baodi-Ninghe fault, and then flows laterally for a long distance from the north to the south to the city of Tianjin. Temperature of the waters increases because of heat exchange with the rocks and recharge by conductive heat flow from beneath.
文摘M ANY people think of Wenzhou, whose many small commodities such as lighters, shoes and locks are well known the world over, as a commercial city. Shops line its streets, and Wenzhou people have such business acumen, they are popularly known as China's prize wheeler dealers. On arrival, however, the traveler discovers that commercial as it may be, Wenzhou
文摘SUBTROPICAL Xishuangbanna, Yunnan Province is home to 13 ethnic minorities, including the Dai, Hani, Blang, Yi and Jino, all of whom go about their daily business clad in colorful folk costumes. Xishuangbanna resembles a real-life Xanadu, far removed from temporal life. Of the ethnic minorities living here, Dai people have the longest history.
文摘The kinetic and thermodynamic structure of typhoon Rammasun (No. 0205) over the Northwest Pacific has been analyzed, using NOAA-16 polar orbiting Advanced Microwave Sounding Unit (AMSU) data collected on 2 July, 2002. The three-dimensional variational (3DVAR) assimila-tion technology is used to assimilate the satellite observation. The results show that the characteristics of the 3D typhoon structure can be more reasonably described from the assimi-lated data. The warm-cored structure of the typhoon is en-hanced in the analyzed field, which corresponds to strong typhoon. The typhoon cyclonic circulation in the middle and lower layers is apparently strengthened, and the strong anti-cyclonic circulation appears at the top of the typhoon. The water vapor and its supply in the typhoon are enhanced. The microwave assimilation data may be used to supply the lack of the conventional observation data over the tropical ocean.
文摘An equation of atomization quantity from energy dissipation by hydraulic jumpwas derived from dimensional analysis. Applying the Gauss diffusion equation, the spray diffusionin valley was studied under the conditions of continuous line source and random wind direction.Considering the spray-rain switching process, coagulation, condensation and evaporation of droplets,the authors calculated the air temperature, air relative humidity, spray density and the rainfallintensity in the lower reaches. The 3-D numerical results agree well with portotype monitoring data.
