Through the Betula nigra afforestation test in the engineering treatment area of the Wuxi Section of the Daning River in Chongqing,the feasibility of arbor vegetation restoration in the comprehensive management of the...Through the Betula nigra afforestation test in the engineering treatment area of the Wuxi Section of the Daning River in Chongqing,the feasibility of arbor vegetation restoration in the comprehensive management of the engineering treatment areas of the Three Gorges Reservoir was explored.The results showed that:(1)before the flooding in the project area,the survival rate of B.nigra seedlings was high,over 95%,and(2)in 2021,after a water storage period,affected by factors such as seedling specifications,flood and flooding time,the survival rate of the seedlings planted in 2020 was low,and the one-year-old seedlings were greatly competed by weeds and grew less.Two-year-old B.nigra seedlings were replanted in 2021,and the survival rate of the B.nigra seedlings was 100%in 2022.Two-year-old B.nigra seedlings have strong adaptability and have little impact on the stability of the engineering treatment area,and can be used as afforestation tree species in engineering treatment areas of hydro-fluctuation zones.展开更多
Low-cost, easy-maintenance and high-efficiency decentralized wastewater treatment technologies are urgently needed in rural areas of China. Processes with high potential for phosphorus removal are of great interest. H...Low-cost, easy-maintenance and high-efficiency decentralized wastewater treatment technologies are urgently needed in rural areas of China. Processes with high potential for phosphorus removal are of great interest. However, commonly used treatment methods often do not meet the strict criteria for removing phosphorus from rural wastewater. In order to search an economic and simple technology for phosphorus removal from the common bit-technologies effluent, seven soil types collected from different rural areas in China were investigated for their ability to remove phosphorus. X-ray diffraction (XRD) was used to analyse the mineral structure, and inductively coupled plasma optical emission spectrometer (ICP-OES) was used to analyse the geochemical composition of the soil samples. Three primary minerals - quartz, albite and montmorillonite - were clearly detected. The samples were divided into two soil types, acidic soils and alkaline soils, based on their pH values. The geochemical composition study indicated that a higher percentage of Ca and Mg occurred in alkaline soils (pH 〉 8) than in acidic soils (pH 〈 6.5). Adsorption isotherms from batch experiments fitted the Langmuir and Freundlich models well, the maximum P adsorption capacities ranged from 0.256 to 1.598 mg P/g, indicating a high phosphorus removal potential for all of these soils. The P fractions extracted revealed that the sum of NaOH-extracted inorganic P (NaOH-Pi) was the major P component in the acidic soils, and CaCO3-bound phosphorus (Ca-P) in the alkaline soils. Dynamic adsorption simulation showed that these soils have the ability to remove phosphorus from wastewater.展开更多
To identify the instability on large scale underground mined-out area in the metal mine effectively,the parameters of radial basis function were determined through clustering method and the improved fuzzy radial basis...To identify the instability on large scale underground mined-out area in the metal mine effectively,the parameters of radial basis function were determined through clustering method and the improved fuzzy radial basis function neural network(FRBFNN)model of instability identification model about large scale underground mined-out area in the metal mine was built.The improved FRBFNN model was trained and tested.The results show that the improved FRBFNN model has high training accuracy and generalization ability.Parameters such as pillar area ratio,filling level and the value of rock quality designation have strong influence on instability of large scale underground mined-out area.Correctness of analysis about the improved FRBFNN model was proved by the practical application results about instability discrimination of surrounding rock in large-scale underground mined-out area of a metal mine in south China.展开更多
The engineering and geological characteristics of a steep slope consisting of coal gangue, rock and soil medium in Huating coal mine have been comprehensively investigated. Owing to humid weather, heavy rainfall, vege...The engineering and geological characteristics of a steep slope consisting of coal gangue, rock and soil medium in Huating coal mine have been comprehensively investigated. Owing to humid weather, heavy rainfall, vegetation and porous characteristics of the soil and rock mass, the steep slope will be destabilized and induce mud-rock flow or derive hazard easily. Firstly, based on the classical slope reinforcement theory, some regularity between the shear and displacement in the destabilized zone of the slope with or without root strength contribution is presented. Then, based on the experimental and statistical analysis of root strength, hydrological characteristics and stability status, etc., some possible biotechnical techniques for reinforcement of the steep slope have been suggested. These methods are important for quantitative analysis of destabilization of the slope and design of the biotechnical reinforcement.展开更多
The surface subsidence is a common environmental hazard in mined-out area. Based on careful analysis of the regularity of surface subsidence in mined-out area, we proposed a new time function based on Harris curve mod...The surface subsidence is a common environmental hazard in mined-out area. Based on careful analysis of the regularity of surface subsidence in mined-out area, we proposed a new time function based on Harris curve model in consideration of the shortage of current surface subsidence time functions. By analyzing the characteristics of the new time function, we found that it could meet the dynamic process, the velocity change process and the acceleration change process during surface subsidence. Then its rationality had been verified through project cases. The results show that the proposed time function model can give a good reflection of the regularity of surface subsidence in mined-out area and can accurately predict surface subsidence. And the prediction data of the model are a little greater than measured data on condition of proper measured data quantity, which is safety in the engineering. This model provides a new method for the analysis of surface subsidence in mined-out area and reference for future prediction, and it is valuable to engineering application.展开更多
AIM: To further evaluate the relationship between BSA and the effects of lamivudine in a greater number of cases and over a longer period of observation than in our previous evaluation.METHODS: We evaluated 249 patien...AIM: To further evaluate the relationship between BSA and the effects of lamivudine in a greater number of cases and over a longer period of observation than in our previous evaluation.METHODS: We evaluated 249 patients with chronic hepatitis B. The effects of treatment for one year (n = 249),two years (n = 147), and three years (n = 72) were evaluated from the levels of serum ALT and HBV-DNA,as biological and virological effects (undetectable levels by PCR), respectively. Moreover, several variables that could influence the response to treatment, including ALT,albumin, bilirubin, platelet counts, BSA, HBV-DNA, and HBeAg were analyzed.RESULTS: For 1-year treatment, multivariate analysis revealed that BSA (P=0.0002) was the only factor for the biological effect, and that ALT (P = 0.0017), HBVDNA (P = 0.0004), and HBeAg (P = 0.0021) were independent factors for the virological effect. For 2-year treatment, multivariate analysis again showed that BSA(P = 0.0147) was the only factor for the biological effect,and that ALT (P = 0.0192) and HBeAg (P = 0.0428) were independent factors for the virological effect. For 3-year treatment, multivariate analysis, however, could not reveal BSA (P = 0.0730) as a factor for the normalization of ALT levels.CONCLUSION: BSA is a significant predictor for the normalizing the effect of lamivudine therapy on ALT for an initial 2-year period, suggesting that lamivudine dosage should be based on the individual BSA.展开更多
Constructed wetlands (CWs) can achieve a high-quality wastewater treatment and a quality that meets the prescribed standard, defined by legislation on wastewater discharge. A limitation in the application of construct...Constructed wetlands (CWs) can achieve a high-quality wastewater treatment and a quality that meets the prescribed standard, defined by legislation on wastewater discharge. A limitation in the application of constructed wetlands (CWs) is the large area requirement, which limits their application. The subject matter of this research is to check the possibility of improving the efficiency of wastewater treatment and reducing the required area for constructed wetlands (CWs) by using an adequate substrate under the conditions found in Montenegro. In the described experiment, the constructed wetlands (CW) have a vertical flow system and play the role of a secondary wastewater treatment, receiving water from the existing WWTP in Podgorica after the primary treatment. These vertical flow systems reflect experience with the use of similar systems in Slovenija, Austria and Italy. Measurements to date show that the substrate plays an important role and that wastewater treatment efficacy varies significantly with respect to the type of substrate when used under the conditions available in Montenegro.展开更多
Effective landscape-scale fuel management strategies are essential for reducing wildfire risk in Mediterranean fire-prone areas.In this study,the minimum travel time(MTT)fire-spread algorithm as implemented in FlamMap...Effective landscape-scale fuel management strategies are essential for reducing wildfire risk in Mediterranean fire-prone areas.In this study,the minimum travel time(MTT)fire-spread algorithm as implemented in FlamMap was applied to assess the potential of alternative fuel treatments for lowering wildfire losses in a 5,740-ha study area in eastern Sardinia,Italy.Twenty-seven wildfires at 10-m resolution were simulated considering three wind speeds(15,18,and 21 km h-1)to compare fuel treatments:no treatment(NT),irrigated agroforestry areas with shrub clearing(T1),prescribed fire in eucalyptus stands(T2),and irrigated grasslands(T3).The simulations replicated a recent large wildfire that occurred in the study area(Orrìwildfire,2019)and considered the weather and fuel moisture conditions associated with this event.The average wildfire exposure outputs(burned area,probability of burning,conditional flame length,potential crown fire occurrence,and surfaces withflame lengths above 2.5 m)decreased after fuel treatments,compared to no treatment.T1 was the most effective strategy in mitigating wildfire hazards and provided the most significant performance for several wildfire exposure indicators.Treating only 0.5%of the study area(~30 ha)resulted in a decrease in all wildfire exposure metrics to~10%within the study area.In addition,the total surface characterized by high flame length(average>2.5 m)was the lowest in the T1 treatment.This study can help land and fire managers optimize fuel treatment opportunities and wildfire risk mitigation strategies in Mediterranean areas.展开更多
背景:抑制控制和药物渴求是评估甲基苯丙胺成瘾者药物戒断的核心要素,备受学界关注。众所周知,要彻底实现对药物成瘾的戒断,恢复吸毒者受损的抑制控制功能,有效降低对药物的渴求是关键。目的:旨在通过系统分析运动与甲基苯丙胺戒断者抑...背景:抑制控制和药物渴求是评估甲基苯丙胺成瘾者药物戒断的核心要素,备受学界关注。众所周知,要彻底实现对药物成瘾的戒断,恢复吸毒者受损的抑制控制功能,有效降低对药物的渴求是关键。目的:旨在通过系统分析运动与甲基苯丙胺戒断者抑制控制和药物渴求的关系,找出促进甲基苯丙胺成瘾戒断的有效运动干预方案,并进一步探究运动作用的内在机制,以期为未来运动运用于毒品戒断提供理论上的支持和应用上的参考。方法:通过检索中国知网、万方、维普、Web of Science及PubMed数据库,中文检索词为“运动,体育锻炼,甲基苯丙胺,抑制功能,渴求度,成瘾”等,英文检索词为“Sport*,Exercise,Methamphetamine,Drug craving,Executive function,Addiction”等,依据纳入和排除标准对文献进行筛选,最终获得目标文献65篇进行综述分析。结果与结论:①运动对甲基苯丙胺戒断者抑制控制方面,急性和长期中等强度有氧运动或急性中高强度间歇训练均能够显著提升甲基苯丙胺戒断者抑制控制能力,对于长期有氧运动而言,有氧操课练习或全身性的综合练习效果更佳,若运动形式为功率自行车,建议增加运动干预频次。②运动对甲基苯丙戒断者药物渴求度方面,急性中等强度有氧运动和抗阻力训练或长期中等强度、高强度或递增负荷的有氧及抗阻力训练均能够有效降低甲基苯丙胺戒断者的药物渴求度。③运动对甲基苯丙胺介导的机体成瘾具有内在调控作用,首先,运动可通过影响大脑腹侧被盖区酪氨酸羟化酶的表达,进而刺激多巴胺受体偶联蛋白的表达,促进大脑奖赏区域多巴胺的合成,弥补由于甲基苯丙胺成瘾导致的多巴胺耗竭;其次,运动也可通过调控蛋白激酶A抑制剂,影响多巴胺D1受体介导的蛋白激酶A信号通路,通过抑制蛋白激酶A从而影响环磷酸腺苷反应结合蛋白,实现对甲基苯丙胺成瘾的调控;最后,运动也可在基因水平上通过影响大脑红核区细胞c-fos基因的表达,激活该区域谷氨酸神经元亚群,产生奖赏效应,实现对甲基苯丙胺成瘾的改善。④虽然目前研究已证实运动与甲基苯丙胺成瘾的关系,且已明晰运动作用的脑内机制,但是否还存在运动作用的其他脑内调控途径有待通过设计更为科学、严谨的动物或人体实验,从细胞或分子学水平出发进行深入探究。展开更多
基金Supported by Chongqing Technology Innovation and Application Development General Project(cstc2019jscx-msxmX0335)。
文摘Through the Betula nigra afforestation test in the engineering treatment area of the Wuxi Section of the Daning River in Chongqing,the feasibility of arbor vegetation restoration in the comprehensive management of the engineering treatment areas of the Three Gorges Reservoir was explored.The results showed that:(1)before the flooding in the project area,the survival rate of B.nigra seedlings was high,over 95%,and(2)in 2021,after a water storage period,affected by factors such as seedling specifications,flood and flooding time,the survival rate of the seedlings planted in 2020 was low,and the one-year-old seedlings were greatly competed by weeds and grew less.Two-year-old B.nigra seedlings were replanted in 2021,and the survival rate of the B.nigra seedlings was 100%in 2022.Two-year-old B.nigra seedlings have strong adaptability and have little impact on the stability of the engineering treatment area,and can be used as afforestation tree species in engineering treatment areas of hydro-fluctuation zones.
基金supported by the Zhejiang Province Key Project (No.2006C13057)the Research Center for Eco-Environmental Sciences,CAS (No.RCEES-QN-200713)
文摘Low-cost, easy-maintenance and high-efficiency decentralized wastewater treatment technologies are urgently needed in rural areas of China. Processes with high potential for phosphorus removal are of great interest. However, commonly used treatment methods often do not meet the strict criteria for removing phosphorus from rural wastewater. In order to search an economic and simple technology for phosphorus removal from the common bit-technologies effluent, seven soil types collected from different rural areas in China were investigated for their ability to remove phosphorus. X-ray diffraction (XRD) was used to analyse the mineral structure, and inductively coupled plasma optical emission spectrometer (ICP-OES) was used to analyse the geochemical composition of the soil samples. Three primary minerals - quartz, albite and montmorillonite - were clearly detected. The samples were divided into two soil types, acidic soils and alkaline soils, based on their pH values. The geochemical composition study indicated that a higher percentage of Ca and Mg occurred in alkaline soils (pH 〉 8) than in acidic soils (pH 〈 6.5). Adsorption isotherms from batch experiments fitted the Langmuir and Freundlich models well, the maximum P adsorption capacities ranged from 0.256 to 1.598 mg P/g, indicating a high phosphorus removal potential for all of these soils. The P fractions extracted revealed that the sum of NaOH-extracted inorganic P (NaOH-Pi) was the major P component in the acidic soils, and CaCO3-bound phosphorus (Ca-P) in the alkaline soils. Dynamic adsorption simulation showed that these soils have the ability to remove phosphorus from wastewater.
基金financially supported by the National"Twelfth-Five-Year"Science&Technology Support Plan(No.2012BAK09B02-05)the National Natural Science Foundation of China(No.51274250)
文摘To identify the instability on large scale underground mined-out area in the metal mine effectively,the parameters of radial basis function were determined through clustering method and the improved fuzzy radial basis function neural network(FRBFNN)model of instability identification model about large scale underground mined-out area in the metal mine was built.The improved FRBFNN model was trained and tested.The results show that the improved FRBFNN model has high training accuracy and generalization ability.Parameters such as pillar area ratio,filling level and the value of rock quality designation have strong influence on instability of large scale underground mined-out area.Correctness of analysis about the improved FRBFNN model was proved by the practical application results about instability discrimination of surrounding rock in large-scale underground mined-out area of a metal mine in south China.
基金This work was financially supported by the National Natural Science Foundation of China (No. 10402033) and the Key Lab. Foun-dation of the Ministry of Education of China (No.04JS19).
文摘The engineering and geological characteristics of a steep slope consisting of coal gangue, rock and soil medium in Huating coal mine have been comprehensively investigated. Owing to humid weather, heavy rainfall, vegetation and porous characteristics of the soil and rock mass, the steep slope will be destabilized and induce mud-rock flow or derive hazard easily. Firstly, based on the classical slope reinforcement theory, some regularity between the shear and displacement in the destabilized zone of the slope with or without root strength contribution is presented. Then, based on the experimental and statistical analysis of root strength, hydrological characteristics and stability status, etc., some possible biotechnical techniques for reinforcement of the steep slope have been suggested. These methods are important for quantitative analysis of destabilization of the slope and design of the biotechnical reinforcement.
基金supported by the Key Program of the National Natural Science Foundation of China (No. 50334060)
文摘The surface subsidence is a common environmental hazard in mined-out area. Based on careful analysis of the regularity of surface subsidence in mined-out area, we proposed a new time function based on Harris curve model in consideration of the shortage of current surface subsidence time functions. By analyzing the characteristics of the new time function, we found that it could meet the dynamic process, the velocity change process and the acceleration change process during surface subsidence. Then its rationality had been verified through project cases. The results show that the proposed time function model can give a good reflection of the regularity of surface subsidence in mined-out area and can accurately predict surface subsidence. And the prediction data of the model are a little greater than measured data on condition of proper measured data quantity, which is safety in the engineering. This model provides a new method for the analysis of surface subsidence in mined-out area and reference for future prediction, and it is valuable to engineering application.
文摘AIM: To further evaluate the relationship between BSA and the effects of lamivudine in a greater number of cases and over a longer period of observation than in our previous evaluation.METHODS: We evaluated 249 patients with chronic hepatitis B. The effects of treatment for one year (n = 249),two years (n = 147), and three years (n = 72) were evaluated from the levels of serum ALT and HBV-DNA,as biological and virological effects (undetectable levels by PCR), respectively. Moreover, several variables that could influence the response to treatment, including ALT,albumin, bilirubin, platelet counts, BSA, HBV-DNA, and HBeAg were analyzed.RESULTS: For 1-year treatment, multivariate analysis revealed that BSA (P=0.0002) was the only factor for the biological effect, and that ALT (P = 0.0017), HBVDNA (P = 0.0004), and HBeAg (P = 0.0021) were independent factors for the virological effect. For 2-year treatment, multivariate analysis again showed that BSA(P = 0.0147) was the only factor for the biological effect,and that ALT (P = 0.0192) and HBeAg (P = 0.0428) were independent factors for the virological effect. For 3-year treatment, multivariate analysis, however, could not reveal BSA (P = 0.0730) as a factor for the normalization of ALT levels.CONCLUSION: BSA is a significant predictor for the normalizing the effect of lamivudine therapy on ALT for an initial 2-year period, suggesting that lamivudine dosage should be based on the individual BSA.
文摘Constructed wetlands (CWs) can achieve a high-quality wastewater treatment and a quality that meets the prescribed standard, defined by legislation on wastewater discharge. A limitation in the application of constructed wetlands (CWs) is the large area requirement, which limits their application. The subject matter of this research is to check the possibility of improving the efficiency of wastewater treatment and reducing the required area for constructed wetlands (CWs) by using an adequate substrate under the conditions found in Montenegro. In the described experiment, the constructed wetlands (CW) have a vertical flow system and play the role of a secondary wastewater treatment, receiving water from the existing WWTP in Podgorica after the primary treatment. These vertical flow systems reflect experience with the use of similar systems in Slovenija, Austria and Italy. Measurements to date show that the substrate plays an important role and that wastewater treatment efficacy varies significantly with respect to the type of substrate when used under the conditions available in Montenegro.
基金funded by"MED-Star"(Grant No.E88H19000120007)“Med-Foreste”(grant no.B85I1900010007)+5 种基金“Med-Coopfi re”(Grant No.B81I1900010007)projectssupported by the European Union under the cross-border Programma Italia-Francia Marittimo 2014–2020the“FOE2019-Climate Change:risk mitigation for sustainable development”(Ministerial Decree no.856/19)projectfunded by the Italian Ministry of EducationUniversity and Research(MIUR)co-financed by the University of Sassari,Fondo di Ateneo per la Ricerca Scientifica(FAR)2020。
文摘Effective landscape-scale fuel management strategies are essential for reducing wildfire risk in Mediterranean fire-prone areas.In this study,the minimum travel time(MTT)fire-spread algorithm as implemented in FlamMap was applied to assess the potential of alternative fuel treatments for lowering wildfire losses in a 5,740-ha study area in eastern Sardinia,Italy.Twenty-seven wildfires at 10-m resolution were simulated considering three wind speeds(15,18,and 21 km h-1)to compare fuel treatments:no treatment(NT),irrigated agroforestry areas with shrub clearing(T1),prescribed fire in eucalyptus stands(T2),and irrigated grasslands(T3).The simulations replicated a recent large wildfire that occurred in the study area(Orrìwildfire,2019)and considered the weather and fuel moisture conditions associated with this event.The average wildfire exposure outputs(burned area,probability of burning,conditional flame length,potential crown fire occurrence,and surfaces withflame lengths above 2.5 m)decreased after fuel treatments,compared to no treatment.T1 was the most effective strategy in mitigating wildfire hazards and provided the most significant performance for several wildfire exposure indicators.Treating only 0.5%of the study area(~30 ha)resulted in a decrease in all wildfire exposure metrics to~10%within the study area.In addition,the total surface characterized by high flame length(average>2.5 m)was the lowest in the T1 treatment.This study can help land and fire managers optimize fuel treatment opportunities and wildfire risk mitigation strategies in Mediterranean areas.
文摘背景:抑制控制和药物渴求是评估甲基苯丙胺成瘾者药物戒断的核心要素,备受学界关注。众所周知,要彻底实现对药物成瘾的戒断,恢复吸毒者受损的抑制控制功能,有效降低对药物的渴求是关键。目的:旨在通过系统分析运动与甲基苯丙胺戒断者抑制控制和药物渴求的关系,找出促进甲基苯丙胺成瘾戒断的有效运动干预方案,并进一步探究运动作用的内在机制,以期为未来运动运用于毒品戒断提供理论上的支持和应用上的参考。方法:通过检索中国知网、万方、维普、Web of Science及PubMed数据库,中文检索词为“运动,体育锻炼,甲基苯丙胺,抑制功能,渴求度,成瘾”等,英文检索词为“Sport*,Exercise,Methamphetamine,Drug craving,Executive function,Addiction”等,依据纳入和排除标准对文献进行筛选,最终获得目标文献65篇进行综述分析。结果与结论:①运动对甲基苯丙胺戒断者抑制控制方面,急性和长期中等强度有氧运动或急性中高强度间歇训练均能够显著提升甲基苯丙胺戒断者抑制控制能力,对于长期有氧运动而言,有氧操课练习或全身性的综合练习效果更佳,若运动形式为功率自行车,建议增加运动干预频次。②运动对甲基苯丙戒断者药物渴求度方面,急性中等强度有氧运动和抗阻力训练或长期中等强度、高强度或递增负荷的有氧及抗阻力训练均能够有效降低甲基苯丙胺戒断者的药物渴求度。③运动对甲基苯丙胺介导的机体成瘾具有内在调控作用,首先,运动可通过影响大脑腹侧被盖区酪氨酸羟化酶的表达,进而刺激多巴胺受体偶联蛋白的表达,促进大脑奖赏区域多巴胺的合成,弥补由于甲基苯丙胺成瘾导致的多巴胺耗竭;其次,运动也可通过调控蛋白激酶A抑制剂,影响多巴胺D1受体介导的蛋白激酶A信号通路,通过抑制蛋白激酶A从而影响环磷酸腺苷反应结合蛋白,实现对甲基苯丙胺成瘾的调控;最后,运动也可在基因水平上通过影响大脑红核区细胞c-fos基因的表达,激活该区域谷氨酸神经元亚群,产生奖赏效应,实现对甲基苯丙胺成瘾的改善。④虽然目前研究已证实运动与甲基苯丙胺成瘾的关系,且已明晰运动作用的脑内机制,但是否还存在运动作用的其他脑内调控途径有待通过设计更为科学、严谨的动物或人体实验,从细胞或分子学水平出发进行深入探究。