Natural and geological environmental conditions have an important impact on the planning and construction of sponge cities.This paper analyzes geological factors that influence the usage of natural sponge bodies,takin...Natural and geological environmental conditions have an important impact on the planning and construction of sponge cities.This paper analyzes geological factors that influence the usage of natural sponge bodies,taking the Shuanghe lake district of Zhengzhou airport zone as an example.An evaluation system with seven factors has been established and the weights of these factors are determined using the analytic hierarchy process(AHP)method.Overlay analysis is then carried out on all factors using GIS to evaluate the geological suitability of the construction of the sponge city.The results show that geologically suitable area for city construction in Shuanghe lake district accounts for 12.3%,relatively suitable area accounts for 76.1%,and relatively unsuitable area accounts for 11.6%.For suitable and relatively suitable areas,we should make full use of the advantages of surface infiltration,vadose zone transportation and aquifer storage to build a sponge city infrastructure with geological engineering as the main component,supplemented by engineering measures such as surface water storage and drainage,and jointly establish a sustainable urban hydrological cycle.For less suitable areas,artificial rain and flood control works,such as roof garden,should be considered.The findings of this paper can serve as an important reference for sponge city planning and construction not only in the research area but also in other regions with similar geological conditions.展开更多
The traditional way of breeding pastured animals is year-round pasture keeping without any additional fertilizing. Recently, among adult animals and the resulting offspring, a large number of individuals with low leve...The traditional way of breeding pastured animals is year-round pasture keeping without any additional fertilizing. Recently, among adult animals and the resulting offspring, a large number of individuals with low levels of natural resistance have begun to appear, which negatively affects the productivity of adults, and growth and development, as well as the safety of the resulting offspring. In this regard, the aim of the study was to study the effects of full-fledged feeding of females during pregnancy on the level of natural resistance of the received goats. To achieve this goal, a number of modern physiological and biochemical research methods were used. According to the results obtained, it was established that with the organization of full-fledged feeding, the period of suckling of the goat develops normally and the resulting baby goats are born with increased levels of natural resistance and more massive. In the goats of the experimental group, these advantages persist steadily until the age of one year, and to a certain extent ensure the normal preservation of the received goats and their growth and development. This makes it possible for farmers to fatten goats unused in breeding from 8 - 9 months of age and donate them for meat as an additional economic supplement to production.展开更多
The aim of this paper is to understand the common characteristics of the generalized flyby trajectory around natural elongated bodies. Such flyby trajectories provide a short-term mechanism to clear away vicinal objec...The aim of this paper is to understand the common characteristics of the generalized flyby trajectory around natural elongated bodies. Such flyby trajectories provide a short-term mechanism to clear away vicinal objects or temporally capture ejecta into circling orbits. The gravitational potential of elongated bodies is described by a unified approximate model, i.e., the rotating mass dipole which is two point masses connected with a constant massless rod The energy power is used to illustrate the flyby effect in terms of the instantaneous orbital energy. The essential of the single flyby trajectory is studied analytically, and the relationship between the flyby trajectory and its Jacobi integral is also illustrated. Sample trajectories are given to show the variational trend of the energy increment with respect to differen orbital periapsides. The distribution of natural ejecting orbits is presented by varying the parameters of the approximate model.展开更多
It is the first time that the world’s first new method of farming,the"Fenlong farming technology,"has been systematically clarified,and the"Fenlong body integrating with natural science"has been c...It is the first time that the world’s first new method of farming,the"Fenlong farming technology,"has been systematically clarified,and the"Fenlong body integrating with natural science"has been created in terms of land resource activation,natural fertilization,natural water management,natural ecological improvement(including climate),and natural indirect activation of river water resources.Moreover,the"theory of Fenlong energy"has been established based on its effectiveness.The"theory of Fenlong energy"originates from the"multiplying and incremental utilization of three-dimensional spatial resources"in production practice.Its application to more than 40 kinds of crops such as rice,corn and wheat in 26 provinces including Guangxi,Xinjiang and Tibet shows that:the yield of arable land increases by 20%to 50%(the quality is improved by 5%),the yield of saline land increases by 20%to 100%,and it can retain 100%of water and resist or ease the disaster.The"theory of three-dimensional spatial resources","Fenlong science","Fenlong law"are the theoretical base for the establishment of the"theory of Fenlong energy".Based on the phenomena that the Fenlong crops have particularly developed root systems,white and more fibrous roots,and tall plants,it is proposed for the first time that Fenlong farming breaks the confinement of the bottom layer of the plow and realizes the holographic penetration of material,energy,and information flows,and there may be the speculation of"Fenlong dark matter flow".展开更多
The main objective of this study was to assess the combined use of chlorine dioxide(ClO_2)and chlorine(Cl_2) on the speciation and kinetics of disinfection by-product(DBP) formation in swimming pools using synth...The main objective of this study was to assess the combined use of chlorine dioxide(ClO_2)and chlorine(Cl_2) on the speciation and kinetics of disinfection by-product(DBP) formation in swimming pools using synthetic pool waters prepared with a body fluid analog(BFA)and/or fresh natural water. At 1:25(mass ratio) of ClO_2 to Cl_2, there was no significant reduction in the formation of trihalomethanes(THMs) and haloacetic acids(HAAs) for both BFA solution and natural water compared to the application of Cl_2 alone. When the mass ratio of ClO_2 to Cl_2increased to 1:1, substantial decreases in both THMs and HAAs were observed in the natural water, while there was almost no change of DBP formations in the BFA solution. Haloacetonitriles and halonitromethanes levels in both water matrices remained similar. In the presence of bromide, the overall DBP formation increased in both BFA solution and natural water. For the DBP formation kinetics, after 72 hr of contact time,very low formation of THMs and HAAs was observed for the use of ClO_2 only. Compared to Cl_2 control, however, applying the 1:1 mixture of ClO_2/Cl_2 reduced THMs by 〉 60% and HAAs by 〉 50%. Chlorite was maintained below 1.0 mg/L, while the formation of chlorate significantly increased over the reaction time. Finally, in a bench-scale indoor pool experiment, applying ClO_2 and Cl_2simultaneously produced less THMs compared to Cl_2 control and kept chlorite at 〈 0.4 mg/L, while HAAs and chlorate accumulated over 4-week operation period.展开更多
基金supported by China Geological Survey project“Monitoring and evaluation of resources and environment bearing capacity in Beijing-Tianjin-Hebei Coordinated Development Region and xiong’an New Area”(DD20221727),“Engineering Geological and Soil&Water Quality Survey of Xiong’an New Area”(DD20189122)a multi-factor municipal geological survey project in Zhengzhou City:Evaluation of geological conditions for sponge city construction in Zhengzhou City(Zhengzhou financial bids for procurement-2021-217)。
文摘Natural and geological environmental conditions have an important impact on the planning and construction of sponge cities.This paper analyzes geological factors that influence the usage of natural sponge bodies,taking the Shuanghe lake district of Zhengzhou airport zone as an example.An evaluation system with seven factors has been established and the weights of these factors are determined using the analytic hierarchy process(AHP)method.Overlay analysis is then carried out on all factors using GIS to evaluate the geological suitability of the construction of the sponge city.The results show that geologically suitable area for city construction in Shuanghe lake district accounts for 12.3%,relatively suitable area accounts for 76.1%,and relatively unsuitable area accounts for 11.6%.For suitable and relatively suitable areas,we should make full use of the advantages of surface infiltration,vadose zone transportation and aquifer storage to build a sponge city infrastructure with geological engineering as the main component,supplemented by engineering measures such as surface water storage and drainage,and jointly establish a sustainable urban hydrological cycle.For less suitable areas,artificial rain and flood control works,such as roof garden,should be considered.The findings of this paper can serve as an important reference for sponge city planning and construction not only in the research area but also in other regions with similar geological conditions.
文摘The traditional way of breeding pastured animals is year-round pasture keeping without any additional fertilizing. Recently, among adult animals and the resulting offspring, a large number of individuals with low levels of natural resistance have begun to appear, which negatively affects the productivity of adults, and growth and development, as well as the safety of the resulting offspring. In this regard, the aim of the study was to study the effects of full-fledged feeding of females during pregnancy on the level of natural resistance of the received goats. To achieve this goal, a number of modern physiological and biochemical research methods were used. According to the results obtained, it was established that with the organization of full-fledged feeding, the period of suckling of the goat develops normally and the resulting baby goats are born with increased levels of natural resistance and more massive. In the goats of the experimental group, these advantages persist steadily until the age of one year, and to a certain extent ensure the normal preservation of the received goats and their growth and development. This makes it possible for farmers to fatten goats unused in breeding from 8 - 9 months of age and donate them for meat as an additional economic supplement to production.
基金supported by the National Basic Research Program of China(973 Program),(Grant 2012CB720000)China Postdoctoral Science Foundation(Grant 2014M560076)Support from Shanghai Satellite Engineering Research Institute(Grant 13dz2260100)is also acknowledged
文摘The aim of this paper is to understand the common characteristics of the generalized flyby trajectory around natural elongated bodies. Such flyby trajectories provide a short-term mechanism to clear away vicinal objects or temporally capture ejecta into circling orbits. The gravitational potential of elongated bodies is described by a unified approximate model, i.e., the rotating mass dipole which is two point masses connected with a constant massless rod The energy power is used to illustrate the flyby effect in terms of the instantaneous orbital energy. The essential of the single flyby trajectory is studied analytically, and the relationship between the flyby trajectory and its Jacobi integral is also illustrated. Sample trajectories are given to show the variational trend of the energy increment with respect to differen orbital periapsides. The distribution of natural ejecting orbits is presented by varying the parameters of the approximate model.
基金Supported by Special Fund Project of Guangxi Innovation Driven Development(Guike AA17204037,Guike 2020AA05002AA)Major Science and Technology Projects in Guangxi(Guike AA16380017)Team Project of Guangxi Academy of Agricultural Sciences(2015YT60)。
文摘It is the first time that the world’s first new method of farming,the"Fenlong farming technology,"has been systematically clarified,and the"Fenlong body integrating with natural science"has been created in terms of land resource activation,natural fertilization,natural water management,natural ecological improvement(including climate),and natural indirect activation of river water resources.Moreover,the"theory of Fenlong energy"has been established based on its effectiveness.The"theory of Fenlong energy"originates from the"multiplying and incremental utilization of three-dimensional spatial resources"in production practice.Its application to more than 40 kinds of crops such as rice,corn and wheat in 26 provinces including Guangxi,Xinjiang and Tibet shows that:the yield of arable land increases by 20%to 50%(the quality is improved by 5%),the yield of saline land increases by 20%to 100%,and it can retain 100%of water and resist or ease the disaster.The"theory of three-dimensional spatial resources","Fenlong science","Fenlong law"are the theoretical base for the establishment of the"theory of Fenlong energy".Based on the phenomena that the Fenlong crops have particularly developed root systems,white and more fibrous roots,and tall plants,it is proposed for the first time that Fenlong farming breaks the confinement of the bottom layer of the plow and realizes the holographic penetration of material,energy,and information flows,and there may be the speculation of"Fenlong dark matter flow".
基金the Scientific and Technological Research Council of Turkey (TUBITAK) for supporting Dr.Nuray Ates
文摘The main objective of this study was to assess the combined use of chlorine dioxide(ClO_2)and chlorine(Cl_2) on the speciation and kinetics of disinfection by-product(DBP) formation in swimming pools using synthetic pool waters prepared with a body fluid analog(BFA)and/or fresh natural water. At 1:25(mass ratio) of ClO_2 to Cl_2, there was no significant reduction in the formation of trihalomethanes(THMs) and haloacetic acids(HAAs) for both BFA solution and natural water compared to the application of Cl_2 alone. When the mass ratio of ClO_2 to Cl_2increased to 1:1, substantial decreases in both THMs and HAAs were observed in the natural water, while there was almost no change of DBP formations in the BFA solution. Haloacetonitriles and halonitromethanes levels in both water matrices remained similar. In the presence of bromide, the overall DBP formation increased in both BFA solution and natural water. For the DBP formation kinetics, after 72 hr of contact time,very low formation of THMs and HAAs was observed for the use of ClO_2 only. Compared to Cl_2 control, however, applying the 1:1 mixture of ClO_2/Cl_2 reduced THMs by 〉 60% and HAAs by 〉 50%. Chlorite was maintained below 1.0 mg/L, while the formation of chlorate significantly increased over the reaction time. Finally, in a bench-scale indoor pool experiment, applying ClO_2 and Cl_2simultaneously produced less THMs compared to Cl_2 control and kept chlorite at 〈 0.4 mg/L, while HAAs and chlorate accumulated over 4-week operation period.