Environmental pollution problem generated in dairy farming process is the bottleneck restricting development of animal husbandry. By using the investigation data from dairy farmers of Inner Mongolia,environmental poll...Environmental pollution problem generated in dairy farming process is the bottleneck restricting development of animal husbandry. By using the investigation data from dairy farmers of Inner Mongolia,environmental pollution problem generated by dairy farming in Inner Mongolia and its cause were analyzed,and prevention and control measures were put forward. The research result showed that weak technology support of environmental treatment and environmental-protection awareness of dairy farmer and bad application effect of pollution control technology caused by lower education degree of dairy farmer were main reasons for environmental pollution problem. We should develop dairy circular economy,advocate a moderate scale,scientifically breed,and enhance training of pollution control technology and propaganda to protect environment.展开更多
The quality of human life has been greatly improved with the rapid development of the market economy.However,at the same time,people are paying more attention to the problems caused by environmental pollution.As a res...The quality of human life has been greatly improved with the rapid development of the market economy.However,at the same time,people are paying more attention to the problems caused by environmental pollution.As a result,there is an increase in environmental awareness.At the present stage,people are concerned about the negative impact that building construction has on the environment.Building construction enterprises must have preventive measures and deal with environmental pollution during construction.This is to minimize pollution caused by construction and to satisfy the implementation of green civilization construction.This is important as it can enhance the development of socialist spiritual civilization and thus promote the expansion of enterprises in the long run.The author explores and analyzes the main types of environmental pollution generated in building construction.Besides,the author provides effective measures for the prevention and control of environmental pollution caused by building construction to reduce its adverse impact on the environment.展开更多
In 2018,the rural revitalization strategy proposed by the No. 1 Document of the central government. Based on the current situation of rural environmental pollution in China,this paper explored the relationship between...In 2018,the rural revitalization strategy proposed by the No. 1 Document of the central government. Based on the current situation of rural environmental pollution in China,this paper explored the relationship between rural revitalization strategy and prevention and control of rural environmental pollution. On this basis,it analyzed the causes of serious rural environmental pollution in China,Finally,it came up with recommendations including establishing a sound rural environmental governance system,making diversified capital investment for nurturing " green farmers".展开更多
Feedforward active noise control(ANC)system are widely used to reduce the wide-band noise in different application.In feedforward ANC systems,when the noise source is unknown,the misplacement of the reference micropho...Feedforward active noise control(ANC)system are widely used to reduce the wide-band noise in different application.In feedforward ANC systems,when the noise source is unknown,the misplacement of the reference microphone may violate the causality constraint.We present a performance analysis of the feedforward ANC system under a noncausal condition.The ANC system performance degrades when the degree of noncausality increases.This research applies the microphone array technique to feedforward ANC systems to solve the unknown noise source problem.The generalized cross-correlation(GCC)and steering response power(SRP)methods based on microphone array are used to estimate the noise source location.Then,the ANC system selects the proper reference microphone for a noise control algorithm.The simulation and experiment results show that the SRP method can estimate the noise source direction with 84%accuracy.The proposed microphone array integrated ANC system can dramatically improve the system performance.展开更多
Production and pollution control situations of dioxins persistent organic pollutants in Guangxi were introduced.Pollution status of dioxins persistent organic pollutants in Guangxi was understood,and the existing prob...Production and pollution control situations of dioxins persistent organic pollutants in Guangxi were introduced.Pollution status of dioxins persistent organic pollutants in Guangxi was understood,and the existing problems in pollution control were analyzed,and finally pollution control countermeasures and suggestions were proposed.展开更多
The shortage of water resources is severe in Beijing. The shortage of eco-environmental water and the sewage discharge over the environmental capacity are main bottlenecks that restrict the improvement of water enviro...The shortage of water resources is severe in Beijing. The shortage of eco-environmental water and the sewage discharge over the environmental capacity are main bottlenecks that restrict the improvement of water environment. The reuse of wastewater could not only reduce the discharge of pollutants,but it could also increase the consumption of eco-environmental water. Therefore the reuse of wastewater is an important approach to improve the water environmental quality. Combined with the formulation process of Regulations of Beijing on Prevention and Control of Water Pollution,the current situations of prevention and control of water pollution in Beijing,the discharge of pollutant,water environmental quality,the population and economic development and water resources and so on were analyzed. And the bottlenecks that restricted the improvement of water environmental quality were found. And the necessity of solving the control of water pollution by reusing the wastewater and ensuring the consumption of eco-environmental water was analyzed from the perspective of the control of water pollution. And some legislative countermeasures were put forward,which provided new ideas for solving the problem of the prevention and control of water pollution and improving the water environmental quality. It was of important reference values for local governments( especially water-deficient regions) to make relative polices or plans of water pollution control and water environmental protection.展开更多
Among the harmful occupational factors,noise is the most common exposure in the oil industrial workplaces.The present study aimed to prioritize sound pollution areas in central processing facilities(CPF)of an oil fiel...Among the harmful occupational factors,noise is the most common exposure in the oil industrial workplaces.The present study aimed to prioritize sound pollution areas in central processing facilities(CPF)of an oil field in order to provide corrective action in the studied industry and similar industries.After reviewing the issued permit to work,job description and noise dosimetry test,the evaluated areas were selected then sound pressure levels in the referenced areas investigated according to ISO 9612–2009(E)next the noise map prepared for all selected areas.For identifying the prioritized areas to implement the control measures NCPI was used.After identifying the first priority area with sound pressure levels greater than 85 dB,the frequency analysis was performed and Isosonic map was prepared by Surfer v10 and AutoCAD 2014.In the last step,in order to provide appropriate corrective action plan,the compatibility of the determined control actions with the production process was examined.The findings of this study indicates that 74%of the aforesaid area has the first priority to perform control measures in the caution zone and the remaining 26%is in the danger zone.In this study it has been demonstrated that implementing control measures for Zone 2 have first priority.The main source of the noise in this zone is fluid(Gas)flow through the piping and HP Gas Compressors.The results of this study shows that using effective factors such as exposure time,sound pressure level and number of exposed persons,can be present suitable model to prioritize noise control.展开更多
[ Objective ] The aim was to study the influence of filamentous algae on the process of water ecological purification. [ Method ] The occurrence mechanism of filamentous algae and its ecological system were summarized...[ Objective ] The aim was to study the influence of filamentous algae on the process of water ecological purification. [ Method ] The occurrence mechanism of filamentous algae and its ecological system were summarized and analyzed. Considering the ecological purification in north- ern Jiangsu, the occurrence and prevention of filamentous algae in water, the method to prevent filamentous algae in polluted water was discussed. [ Result] The results showed that by measures of improving planting density, regular harvesting, and water flow state control before the filamentous algae blooming period, together with improving local pH value, light interference and ecological control during the blooming period, can effectively control the filamentous algae blooming. [ Condusion] The study of the happening mechanism of filamentous algae provided theoretical references and the technical basis in the work of filamentous algae prevention and control.展开更多
AIM To establish an experimental model of stress ulcer produced by explosive noise, and to probe into its mechanism and protection. METHODS The country standard Wistar white rats were randomly divided into control ...AIM To establish an experimental model of stress ulcer produced by explosive noise, and to probe into its mechanism and protection. METHODS The country standard Wistar white rats were randomly divided into control group ( n =8), which were neither stimulated nor protected, and stimulating group (divided into subgroups A, B and C, including 8 rats each which were decapitated to draw blood for test immediately, 12 hours and 24 hours after stimulation) and prevention group (divided into subgroups A, B and C, having 8 rats each, subgroup A was given cimetidine, B anisodamine and C both drugs). Firing noises of submachine guns were used as inflicting factor. The rats were fasted for 24 hours and stimulated by firing noise for 12 hours. The change of ulcer index, gastric mucosal and related serum hormones were observed. RESULTS Stress ulcer was significant in the stimulating group, and its ulcer index (8 6±0 6) was remarkably higher than that in both the control group and prevention group (0 3±0 1, P <0 01). Its serum gastrin (Gas ng/L , 294±163 vs 63±40, P <0 01) and endothelin (ET ng/L , 181±57 vs 135±42, P <0 01) were apparently higher than those in the control group, and its serum nitric oxide (NO) level was conspicuously lower than that in the control group ( ng/L , 0 2±0 1 vs 0 8±0 5, P <0 05), while the serum gastrin level ( ng/L , 556±225) in prevention group was distinctly higher than that in both the control ( P <0 01) and stimulating group ( P <0 05). There were no significant differences in the changes of ET and NO between the control and the stimulating groups. CONCLUSION Stress ulcer model of rats can be successfully established by the stimulation of explosive noise. Gas, ET and NO are related to the formation of stress ulcer, and play an important role in its mechanism. Hepatic function affected by noise is observed in this experiment.展开更多
Based on the statistical data related to water pollution in recent years, this paper firstly describes in detail the current status of water pollution and water quality in rivers, lakes, reservoirs, groundwater and co...Based on the statistical data related to water pollution in recent years, this paper firstly describes in detail the current status of water pollution and water quality in rivers, lakes, reservoirs, groundwater and coastal waters in China, then makes a comprehensive analysis on future trends of water pollution in China. The authors hold that the economic power, technology level and management level have determinative influences on the current status and future trends of water pollution. At last, this paper discusses briefly the policies and measures for preventing and controlling water pollution in the light of the national conditions.展开更多
Air pollution is a hot issue studied by scholars all over the world.Academic circles generally believe that socio-economic factors such as extensive economic growth,unbalanced proportion of industrial structure and un...Air pollution is a hot issue studied by scholars all over the world.Academic circles generally believe that socio-economic factors such as extensive economic growth,unbalanced proportion of industrial structure and unreasonable energy consumption structure are the main"culprits"of serious air pollution in China.Therefore,the relationship between air pollution and socio-economic growth has very important theoretical and practical significance for air pollution prevention and control and promoting the sustainable and healthy development of cities.Through literature research and summary methods,this paper studies the severity and harmfulness of air pollution in China,and deeply studies the research progress of socio-economic influencing factors of air pollution,environmental Kuznets curve hypothesis of air pollution,decoupling relationship between air pollution and socio-economic growth,so as to provide useful reference for the prevention and control of air pollution.展开更多
文摘Environmental pollution problem generated in dairy farming process is the bottleneck restricting development of animal husbandry. By using the investigation data from dairy farmers of Inner Mongolia,environmental pollution problem generated by dairy farming in Inner Mongolia and its cause were analyzed,and prevention and control measures were put forward. The research result showed that weak technology support of environmental treatment and environmental-protection awareness of dairy farmer and bad application effect of pollution control technology caused by lower education degree of dairy farmer were main reasons for environmental pollution problem. We should develop dairy circular economy,advocate a moderate scale,scientifically breed,and enhance training of pollution control technology and propaganda to protect environment.
文摘The quality of human life has been greatly improved with the rapid development of the market economy.However,at the same time,people are paying more attention to the problems caused by environmental pollution.As a result,there is an increase in environmental awareness.At the present stage,people are concerned about the negative impact that building construction has on the environment.Building construction enterprises must have preventive measures and deal with environmental pollution during construction.This is to minimize pollution caused by construction and to satisfy the implementation of green civilization construction.This is important as it can enhance the development of socialist spiritual civilization and thus promote the expansion of enterprises in the long run.The author explores and analyzes the main types of environmental pollution generated in building construction.Besides,the author provides effective measures for the prevention and control of environmental pollution caused by building construction to reduce its adverse impact on the environment.
文摘In 2018,the rural revitalization strategy proposed by the No. 1 Document of the central government. Based on the current situation of rural environmental pollution in China,this paper explored the relationship between rural revitalization strategy and prevention and control of rural environmental pollution. On this basis,it analyzed the causes of serious rural environmental pollution in China,Finally,it came up with recommendations including establishing a sound rural environmental governance system,making diversified capital investment for nurturing " green farmers".
文摘Feedforward active noise control(ANC)system are widely used to reduce the wide-band noise in different application.In feedforward ANC systems,when the noise source is unknown,the misplacement of the reference microphone may violate the causality constraint.We present a performance analysis of the feedforward ANC system under a noncausal condition.The ANC system performance degrades when the degree of noncausality increases.This research applies the microphone array technique to feedforward ANC systems to solve the unknown noise source problem.The generalized cross-correlation(GCC)and steering response power(SRP)methods based on microphone array are used to estimate the noise source location.Then,the ANC system selects the proper reference microphone for a noise control algorithm.The simulation and experiment results show that the SRP method can estimate the noise source direction with 84%accuracy.The proposed microphone array integrated ANC system can dramatically improve the system performance.
文摘Production and pollution control situations of dioxins persistent organic pollutants in Guangxi were introduced.Pollution status of dioxins persistent organic pollutants in Guangxi was understood,and the existing problems in pollution control were analyzed,and finally pollution control countermeasures and suggestions were proposed.
文摘The shortage of water resources is severe in Beijing. The shortage of eco-environmental water and the sewage discharge over the environmental capacity are main bottlenecks that restrict the improvement of water environment. The reuse of wastewater could not only reduce the discharge of pollutants,but it could also increase the consumption of eco-environmental water. Therefore the reuse of wastewater is an important approach to improve the water environmental quality. Combined with the formulation process of Regulations of Beijing on Prevention and Control of Water Pollution,the current situations of prevention and control of water pollution in Beijing,the discharge of pollutant,water environmental quality,the population and economic development and water resources and so on were analyzed. And the bottlenecks that restricted the improvement of water environmental quality were found. And the necessity of solving the control of water pollution by reusing the wastewater and ensuring the consumption of eco-environmental water was analyzed from the perspective of the control of water pollution. And some legislative countermeasures were put forward,which provided new ideas for solving the problem of the prevention and control of water pollution and improving the water environmental quality. It was of important reference values for local governments( especially water-deficient regions) to make relative polices or plans of water pollution control and water environmental protection.
文摘Among the harmful occupational factors,noise is the most common exposure in the oil industrial workplaces.The present study aimed to prioritize sound pollution areas in central processing facilities(CPF)of an oil field in order to provide corrective action in the studied industry and similar industries.After reviewing the issued permit to work,job description and noise dosimetry test,the evaluated areas were selected then sound pressure levels in the referenced areas investigated according to ISO 9612–2009(E)next the noise map prepared for all selected areas.For identifying the prioritized areas to implement the control measures NCPI was used.After identifying the first priority area with sound pressure levels greater than 85 dB,the frequency analysis was performed and Isosonic map was prepared by Surfer v10 and AutoCAD 2014.In the last step,in order to provide appropriate corrective action plan,the compatibility of the determined control actions with the production process was examined.The findings of this study indicates that 74%of the aforesaid area has the first priority to perform control measures in the caution zone and the remaining 26%is in the danger zone.In this study it has been demonstrated that implementing control measures for Zone 2 have first priority.The main source of the noise in this zone is fluid(Gas)flow through the piping and HP Gas Compressors.The results of this study shows that using effective factors such as exposure time,sound pressure level and number of exposed persons,can be present suitable model to prioritize noise control.
文摘[ Objective ] The aim was to study the influence of filamentous algae on the process of water ecological purification. [ Method ] The occurrence mechanism of filamentous algae and its ecological system were summarized and analyzed. Considering the ecological purification in north- ern Jiangsu, the occurrence and prevention of filamentous algae in water, the method to prevent filamentous algae in polluted water was discussed. [ Result] The results showed that by measures of improving planting density, regular harvesting, and water flow state control before the filamentous algae blooming period, together with improving local pH value, light interference and ecological control during the blooming period, can effectively control the filamentous algae blooming. [ Condusion] The study of the happening mechanism of filamentous algae provided theoretical references and the technical basis in the work of filamentous algae prevention and control.
文摘AIM To establish an experimental model of stress ulcer produced by explosive noise, and to probe into its mechanism and protection. METHODS The country standard Wistar white rats were randomly divided into control group ( n =8), which were neither stimulated nor protected, and stimulating group (divided into subgroups A, B and C, including 8 rats each which were decapitated to draw blood for test immediately, 12 hours and 24 hours after stimulation) and prevention group (divided into subgroups A, B and C, having 8 rats each, subgroup A was given cimetidine, B anisodamine and C both drugs). Firing noises of submachine guns were used as inflicting factor. The rats were fasted for 24 hours and stimulated by firing noise for 12 hours. The change of ulcer index, gastric mucosal and related serum hormones were observed. RESULTS Stress ulcer was significant in the stimulating group, and its ulcer index (8 6±0 6) was remarkably higher than that in both the control group and prevention group (0 3±0 1, P <0 01). Its serum gastrin (Gas ng/L , 294±163 vs 63±40, P <0 01) and endothelin (ET ng/L , 181±57 vs 135±42, P <0 01) were apparently higher than those in the control group, and its serum nitric oxide (NO) level was conspicuously lower than that in the control group ( ng/L , 0 2±0 1 vs 0 8±0 5, P <0 05), while the serum gastrin level ( ng/L , 556±225) in prevention group was distinctly higher than that in both the control ( P <0 01) and stimulating group ( P <0 05). There were no significant differences in the changes of ET and NO between the control and the stimulating groups. CONCLUSION Stress ulcer model of rats can be successfully established by the stimulation of explosive noise. Gas, ET and NO are related to the formation of stress ulcer, and play an important role in its mechanism. Hepatic function affected by noise is observed in this experiment.
文摘Based on the statistical data related to water pollution in recent years, this paper firstly describes in detail the current status of water pollution and water quality in rivers, lakes, reservoirs, groundwater and coastal waters in China, then makes a comprehensive analysis on future trends of water pollution in China. The authors hold that the economic power, technology level and management level have determinative influences on the current status and future trends of water pollution. At last, this paper discusses briefly the policies and measures for preventing and controlling water pollution in the light of the national conditions.
基金Supported by Humanities and Social Sciences Project of the Ministry of Education“Relationship between Haze Pollution and Socio-economic Growth:Research on Three Dimensions Spatial-temporal Feature,Decoupling Effect and Collaborative Governance”(21YJCZH016).
文摘Air pollution is a hot issue studied by scholars all over the world.Academic circles generally believe that socio-economic factors such as extensive economic growth,unbalanced proportion of industrial structure and unreasonable energy consumption structure are the main"culprits"of serious air pollution in China.Therefore,the relationship between air pollution and socio-economic growth has very important theoretical and practical significance for air pollution prevention and control and promoting the sustainable and healthy development of cities.Through literature research and summary methods,this paper studies the severity and harmfulness of air pollution in China,and deeply studies the research progress of socio-economic influencing factors of air pollution,environmental Kuznets curve hypothesis of air pollution,decoupling relationship between air pollution and socio-economic growth,so as to provide useful reference for the prevention and control of air pollution.