Zilong Zhang | Lanzhou University (original) (raw)

Papers by Zilong Zhang

Land, Feb 8, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Resources Science, 2009

In this paper, a simulation model is constructed to illustrate the feedback relations between eco... more In this paper, a simulation model is constructed to illustrate the feedback relations between economic growth, resource depletion and environmental impact based on system dynamics (SD), ecological economics and Cobb-Douglas production function. It also reflects the feedback relations between production and factors of production, limited availability of natural resources, and the limits on the consumption scale of those resources. The core modeling in this paper is Cobb-Douglas production function. Manufactured capital, renewable natural capital, nonrenewable natural capital, and human capital are the production factors in Cobb-Douglas production function. Technology used in the production sets the overall level of efficiency in production. Eight sub-systems together determine possible scenarios of the Resources-Environmental-Economic System by interacting with and feeding back to each other. There are six variables in Cobb-Douglas production function corresponding to the six sub-systems respectively. They are production, technology, human capital, manufactured capital, renewable natural resource input and un-renewable natural resource input. In addition to the six sub-systems, there are two other sub-systems in parallel, which are population and environment. By adjusting parameters within the model and changing the specification of some variables, the isolated effect of resource depletion, technological development, or other factors on per-capita production scale can be revealed. The results of the modeling can offer some constructional advices for the sustainable development in Qinghai Province. The objective is to illustrate an ecological-economic system at a high level of aggregation, and to illustrate different aspects of the competing economy and an world view of ecological-economy, including the concepts on a sustainable scale. Formulation experiments indicate the importance of technology in the economic growth, as well as the sensitivity of output to industrial specialization. Formulation experiments also illustrate how a natural capital-based limitation on the development of manufactured capital affects output, how the increasing scarcity of resources places a drag on output, and how that drag may result in overshoot and collapse, even if common assumptions of technological development and factor substitutability are employed. The results indicate that: 1) the economic development in Qinghai Province is largely dependent on natural resources, so it is difficult to achieve sustainable development, and the temporal development mode of Qinghai province is not sustainable; 2) technical contribution to economic growth is very prominent, and the rate of technical substitution for natural resources is low; 3) national investment is an important guarantee for Qinghai to build an environment-friendly society; 4) the only way to realize sustainable development in Qinghai province is to change the mode of economic development and develop circular economy.

Discrete Dynamics in Nature and Society, Mar 12, 2020

As the forerunner and policy test field of the sustainable development, the sustainable developme... more As the forerunner and policy test field of the sustainable development, the sustainable development pilot zones are an important strategy for China to explore the mechanism and model of the coordinated development of human and land in different regional units. However, the impact of sustainable development pilot zones, especially on the improvement of environmental efficiency, needs to be assessed. In this paper, 187 prefecture-level cities in China were taken as samples (22 sustainable development pilot zones and 165 nonpilot ones). Firstly, the environmental efficiency of 187 prefecture-level cities between 2006 and 2016 was measured by data envelopment analysis (DEA). en, the effect of construction of sustainable development pilot zones on environmental efficiency was assessed using the difference-indifference (DID) model. e assessment results were further verified by propensity score matching with difference-indifference (PSM-DID). In addition, the impact mechanism of construction of the sustainable development pilot zones on the environmental efficiency was discussed. Results show that the environmental efficiency of sustainable development pilot zones is 27.7∼31.7% greater than that of nonsustainable one, which is mainly attributed to the environmental regulation and industrial structure adjustment.

Sustainability, Nov 28, 2014

Integrated analysis on socioeconomic metabolism could provide a basis for understanding and optim... more Integrated analysis on socioeconomic metabolism could provide a basis for understanding and optimizing regional sustainability. The paper conducted socioeconomic metabolism analysis by means of the emergy accounting method coupled with data envelopment analysis and decomposition analysis techniques to assess the sustainability of Qingyang city and its eight sub-region system, as well as to identify the major driving factors of performance change during 2000-2007, to serve as the basis for future policy scenarios. The results indicate that Qingyang greatly depended on non-renewable emergy flows and feedback (purchased) emergy flows, except the two sub-regions, named Huanxian and Huachi, which highly depended on renewable emergy flow. Zhenyuan, Huanxian and Qingcheng were identified as being relatively emergy efficient, and the other five sub-regions have potential to reduce natural resource inputs and waste output to achieve the goal of efficiency. The results of decomposition analysis show that the economic growth, as well as the increased emergy yield ratio and population not accompanied by a sufficient increase of resource utilization efficiency are the main drivers of the unsustainable economic model in Qingyang and call for polices to promote the efficiency of resource utilization and to optimize natural resource use.

International Journal of Environmental Research and Public Health, May 15, 2020

Eco-efficiency enhancement is an inherent requirement of green development and an important indic... more Eco-efficiency enhancement is an inherent requirement of green development and an important indicator of high-quality development in general. It aims to achieve the coordinated development of nature, the economy, and society. Therefore, eco-efficiency measurements should focus on not only total factor input, but also process analysis. Based on the "full world" model in ecological economic theory, this study constructed a theoretical framework for a composite economic-environmental-social system that reflects human welfare and sustainability. To this end, using network data envelopment analysis (DEA), this study established a staged eco-efficiency evaluation model that uses economic, environmental, and social factors to measure the overall and staged eco-efficiency of China's provinces from 2003 to 2016 and analyze its spatiotemporal characteristics. A geographically weighted regression (GWR) model was also used to analyze the influencing factors of eco-efficiency changes and the spatial differentiation in their effect intensity. The findings were as follows: (1) China's overall eco-efficiency is still at a low level. It varies significantly from region to region, and only three regions are at the frontier of production. The eastern region has the highest eco-efficiency, followed by the central region, and the gap between the central and western regions has gradually narrowed. In terms of staged efficiency, the level of eco-efficiency in the production stage is less than in the environmental governance stage, which is less than that in the social input stage. (2) In terms of the efficiency of each stage, the efficiency level of the production stage showed a downward trend throughout the entire process, and the decline in the central and western regions was more obvious. The social input stage and the environmental governance stage both showed upward trends. The social input stage showed a higher level, and the increase was relatively flat during the period of study. Efficiency continued to rise during the environmental governance stage from 2003 to 2010 and rose overall, but with some fluctuations from 2011 to 2016. (3) Geographically weighted regression showed that the effects of the influencing factors on eco-efficiency had obvious spatial heterogeneity. The factors affecting overall, production stage, and social input eco-efficiency were, in order of effect intensity from high to low, economic growth level, marketization level, and social input level. In terms of environmental governance, social input level had the greatest impact, followed by economic growth; marketization level did not show a significant impact.

... The curve of the Emergy Sustainable Development Index(ESI) is nonstationary downtrend(Fig. 10... more ... The curve of the Emergy Sustainable Development Index(ESI) is nonstationary downtrend(Fig. 10), which is influenced by Net Emergy Yield Ratio(NEYR) and Environment Loading Ratio(ELR). ... [4] Ulgiati S, Brown M. Monitoring patterns of sustainability in natural and man-made ...

Page 1. Study on Meta Index in the Process of Evaluating Regional Sustainable Development Sponsor... more Page 1. Study on Meta Index in the Process of Evaluating Regional Sustainable Development Sponsored by: National Natural Science Foundation of China (40871061). LU Chenyu12 CHEN Xingpeng2 XUE Bing23 ZHANG Zilong2 ...

Abstract—Zhengning County in Gansu Province, the cradle of traditional farming culture, is abunda... more Abstract—Zhengning County in Gansu Province, the cradle of traditional farming culture, is abundant in coal resource and solar energy, but it is ecologically fragile and has significant ecological service function, therefore facing the dual pressure of resource exploitation and ...

Land

Eco-efficiency is a key indicator to measure the level of regional sustainable development. The c... more Eco-efficiency is a key indicator to measure the level of regional sustainable development. The county is the basic spatial unit of socio-economic activities and sustainable policy implementation in China. Hence, this paper conducts eco-efficiency analysis at the county scale in order to provide reference for the central and local governments to formulate differentiated eco-efficiency enhancement policies, further promote Chinese ecological sustainable development, and advance the construction of ecological civilization with high quality. Based on the Super-Slacks-Based Measure (SBM) model and the Malmquist index, the paper constructed an eco-efficiency measurement method and analyzed the variation characteristics, influencing factors, spatial pattern of eco-efficiency in Chinese counties from 2000 to 2020. The results showed that: (1) The eco-efficiency of the county unit was generally low in China and was roughly distributed in a pyramid. The county-level eco-efficiency had a spat...

International Journal of Environmental Research and Public Health, 2020

Eco-efficiency enhancement is an inherent requirement of green development and an important indic... more Eco-efficiency enhancement is an inherent requirement of green development and an important indicator of high-quality development in general. It aims to achieve the coordinated development of nature, the economy, and society. Therefore, eco-efficiency measurements should focus on not only total factor input, but also process analysis. Based on the “full world” model in ecological economic theory, this study constructed a theoretical framework for a composite economic-environmental-social system that reflects human welfare and sustainability. To this end, using network data envelopment analysis (DEA), this study established a staged eco-efficiency evaluation model that uses economic, environmental, and social factors to measure the overall and staged eco-efficiency of China’s provinces from 2003 to 2016 and analyze its spatiotemporal characteristics. A geographically weighted regression (GWR) model was also used to analyze the influencing factors of eco-efficiency changes and the spa...

Discrete Dynamics in Nature and Society, 2020

As the forerunner and policy test field of the sustainable development, the sustainable developme... more As the forerunner and policy test field of the sustainable development, the sustainable development pilot zones are an important strategy for China to explore the mechanism and model of the coordinated development of human and land in different regional units. However, the impact of sustainable development pilot zones, especially on the improvement of environmental efficiency, needs to be assessed. In this paper, 187 prefecture-level cities in China were taken as samples (22 sustainable development pilot zones and 165 nonpilot ones). Firstly, the environmental efficiency of 187 prefecture-level cities between 2006 and 2016 was measured by data envelopment analysis (DEA). Then, the effect of construction of sustainable development pilot zones on environmental efficiency was assessed using the difference-in-difference (DID) model. The assessment results were further verified by propensity score matching with difference-in-difference (PSM-DID). In addition, the impact mechanism of cons...

2011 International Conference on Computer Science and Service System (CSSS), 2011

ABSTRACT Based on GIS technique, this paper researched spatio-temporal evolvement of regional eco... more ABSTRACT Based on GIS technique, this paper researched spatio-temporal evolvement of regional economic pattern in Ningxia province from 1995 to 2009. It is considered that the IDW method is better to express spatial structure of regional economy by comparing different methods of spatial interpolation. According to the result of interpolation, the regional economic pattern is shown as a map by dividing the region into different economic zone. It shows that in recent 15 years the regional economic development is not balanced in Ningxia province. The disparity between south and north is obvious. The level and speed of economic development is degressive from north to south, so the structure of "north, middle and south" is formed. The stimulative effect of towns and traffic lines for regional economic development is better in the north than in the south.

2010 International Conference on Management and Service Science, 2010

Page 1. Study on Meta Index in the Process of Evaluating Regional Sustainable Development Sponsor... more Page 1. Study on Meta Index in the Process of Evaluating Regional Sustainable Development Sponsored by: National Natural Science Foundation of China (40871061). LU Chenyu12 CHEN Xingpeng2 XUE Bing23 ZHANG Zilong2 ...

Sustainability, 2014

Integrated analysis on socioeconomic metabolism could provide a basis for understanding and optim... more Integrated analysis on socioeconomic metabolism could provide a basis for understanding and optimizing regional sustainability. The paper conducted socioeconomic metabolism analysis by means of the emergy accounting method coupled with data envelopment analysis and decomposition analysis techniques to assess the sustainability of Qingyang city and its eight sub-region system, as well as to identify the major driving factors of performance change during 2000-2007, to serve as the basis for future policy scenarios. The results indicate that Qingyang greatly depended on non-renewable emergy flows and feedback (purchased) emergy flows, except the two sub-regions, named Huanxian and Huachi, which highly depended on renewable emergy flow. Zhenyuan, Huanxian and Qingcheng were identified as being relatively emergy efficient, and the other five sub-regions have potential to reduce natural resource inputs and waste output to achieve the goal of efficiency. The results of decomposition analysis show that the economic growth, as well as the increased emergy yield ratio and population not accompanied by a sufficient increase of resource utilization efficiency are the main drivers of the unsustainable economic model in Qingyang and call for polices to promote the efficiency of resource utilization and to optimize natural resource use.

Advanced Materials Research, 2011

Based on meta index theory, this paper proposes an indicator system and a synthetic assessment mo... more Based on meta index theory, this paper proposes an indicator system and a synthetic assessment model, which is used to assess the regional sustainable development on county level for Qingyang. And then, the paper respectively analyzes the characters of temporal and spatial evolvement on the subregional sustainable development in Qingyang from 1990 to 2008. The outcome shows that the integrated sustainability as a whole increased gradually from 1990 to 2008, where the driving force is due to the rapid growing of the economy and society along with the cost of abundant resources consumption and ecosystem degradation. At present, the integrated sustainability in some counties began to decrease.

Optics Express, 2015

Emission of the two electrons released from nonsequential double ionization of argon atoms is ant... more Emission of the two electrons released from nonsequential double ionization of argon atoms is anticorrelated at lower laser intensities but is correlated at higher laser intensities. Such a transition is caused by the momentum change of recollision-induced-ionization (RII) electrons. At lower laser intensities, the Coulomb repulsion between the two RII electrons dominates the motion of electrons and pushes them leaving the laser field back-to-back. At higher laser intensities, the drift momentum obtained from the laser field dominates the motion of electrons and drives them leaving the laser field side-by-side.

The Journal of biological chemistry, Jan 3, 2014

The committed step of leucine biosynthesis, converting acetyl-CoA and α-ketoisovalerate into α-is... more The committed step of leucine biosynthesis, converting acetyl-CoA and α-ketoisovalerate into α-isopropylmalate, is catalyzed by α-isopropylmalate synthase (IPMS), an allosteric enzyme subjected to feedback inhibition by the end product L-leucine. We characterized the short form IPMS from Leptospira biflexa (LbIPMS2), which exhibits a catalytic activity comparable with that of the long form IPMS (LbIPMS1) and has a similar N-terminal domain followed by subdomain I and subdomain II but lacks the whole C-terminal regulatory domain. We found that partial deletion of the regulatory domain of LbIPMS1 resulted in a loss of about 50% of the catalytic activity; however, when the regulatory domain was deleted up to Arg-385, producing a protein that is almost equivalent to the intact LbIPMS2, about 90% of the activity was maintained. Moreover, in LbIPMS2 or LbIPMS1, further deletion of several residues from the C terminus of subdomain II significantly impaired or completely abolished the catal...

Sustainability, 2014

As the largest solid waste (SW) generator in the world, China is facing serious pollution issues ... more As the largest solid waste (SW) generator in the world, China is facing serious pollution issues induced by increasing quantities of SW. The sustainability assessment of SW management is very important for designing relevant policy for further improving the overall efficiency of solid waste management (SWM). By focusing on industrial solid waste (ISW) and municipal solid waste (MSW), the paper investigated the sustainability performance of SWM by applying decoupling analysis, and further identified the main drivers of SW change in China by adopting Logarithmic Mean Divisia Index (LMDI) model. The results indicate that China has made a great achievement in SWM which was specifically expressed as the increase of ISW utilized amount and harmless disposal ratio of MSW, decrease of industrial solid waste discharged (ISWD), and absolute decoupling of ISWD from economic growth as well. However, China has a long way to go to achieve the goal of sustainable management of SW. The weak decoupling, even expansive negative decoupling of ISW generation and MSW disposal suggests that China needs timely technology innovation and rational institutional arrangement to reduce SW intensity from

Resources Conservation and Recycling, 2010

With rapid industrialization in China, both resource scarcity and resources efficiency have chall... more With rapid industrialization in China, both resource scarcity and resources efficiency have challenged the country's sustainable development. Under such circumstance, circular economy should be adopted as a national development strategy. However, due to a lack ...

2011 Asia-Pacific Power and Energy Engineering Conference, 2011

Ecological Footprint model is an important method to evaluate the sustainability of regional deve... more Ecological Footprint model is an important method to evaluate the sustainability of regional development. This paper assesses the area demand of Ningxia Hui Autonomous Region by calculates the Ecological Footprint and the Ecological Carrying Capacity in the 20 years from 1986 to 2005.The results show that Ecological Deficits occurred and then continued to increase, which demonstrate that great human-environment conflicts

Land, Feb 8, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Resources Science, 2009

In this paper, a simulation model is constructed to illustrate the feedback relations between eco... more In this paper, a simulation model is constructed to illustrate the feedback relations between economic growth, resource depletion and environmental impact based on system dynamics (SD), ecological economics and Cobb-Douglas production function. It also reflects the feedback relations between production and factors of production, limited availability of natural resources, and the limits on the consumption scale of those resources. The core modeling in this paper is Cobb-Douglas production function. Manufactured capital, renewable natural capital, nonrenewable natural capital, and human capital are the production factors in Cobb-Douglas production function. Technology used in the production sets the overall level of efficiency in production. Eight sub-systems together determine possible scenarios of the Resources-Environmental-Economic System by interacting with and feeding back to each other. There are six variables in Cobb-Douglas production function corresponding to the six sub-systems respectively. They are production, technology, human capital, manufactured capital, renewable natural resource input and un-renewable natural resource input. In addition to the six sub-systems, there are two other sub-systems in parallel, which are population and environment. By adjusting parameters within the model and changing the specification of some variables, the isolated effect of resource depletion, technological development, or other factors on per-capita production scale can be revealed. The results of the modeling can offer some constructional advices for the sustainable development in Qinghai Province. The objective is to illustrate an ecological-economic system at a high level of aggregation, and to illustrate different aspects of the competing economy and an world view of ecological-economy, including the concepts on a sustainable scale. Formulation experiments indicate the importance of technology in the economic growth, as well as the sensitivity of output to industrial specialization. Formulation experiments also illustrate how a natural capital-based limitation on the development of manufactured capital affects output, how the increasing scarcity of resources places a drag on output, and how that drag may result in overshoot and collapse, even if common assumptions of technological development and factor substitutability are employed. The results indicate that: 1) the economic development in Qinghai Province is largely dependent on natural resources, so it is difficult to achieve sustainable development, and the temporal development mode of Qinghai province is not sustainable; 2) technical contribution to economic growth is very prominent, and the rate of technical substitution for natural resources is low; 3) national investment is an important guarantee for Qinghai to build an environment-friendly society; 4) the only way to realize sustainable development in Qinghai province is to change the mode of economic development and develop circular economy.

Discrete Dynamics in Nature and Society, Mar 12, 2020

As the forerunner and policy test field of the sustainable development, the sustainable developme... more As the forerunner and policy test field of the sustainable development, the sustainable development pilot zones are an important strategy for China to explore the mechanism and model of the coordinated development of human and land in different regional units. However, the impact of sustainable development pilot zones, especially on the improvement of environmental efficiency, needs to be assessed. In this paper, 187 prefecture-level cities in China were taken as samples (22 sustainable development pilot zones and 165 nonpilot ones). Firstly, the environmental efficiency of 187 prefecture-level cities between 2006 and 2016 was measured by data envelopment analysis (DEA). en, the effect of construction of sustainable development pilot zones on environmental efficiency was assessed using the difference-indifference (DID) model. e assessment results were further verified by propensity score matching with difference-indifference (PSM-DID). In addition, the impact mechanism of construction of the sustainable development pilot zones on the environmental efficiency was discussed. Results show that the environmental efficiency of sustainable development pilot zones is 27.7∼31.7% greater than that of nonsustainable one, which is mainly attributed to the environmental regulation and industrial structure adjustment.

Sustainability, Nov 28, 2014

Integrated analysis on socioeconomic metabolism could provide a basis for understanding and optim... more Integrated analysis on socioeconomic metabolism could provide a basis for understanding and optimizing regional sustainability. The paper conducted socioeconomic metabolism analysis by means of the emergy accounting method coupled with data envelopment analysis and decomposition analysis techniques to assess the sustainability of Qingyang city and its eight sub-region system, as well as to identify the major driving factors of performance change during 2000-2007, to serve as the basis for future policy scenarios. The results indicate that Qingyang greatly depended on non-renewable emergy flows and feedback (purchased) emergy flows, except the two sub-regions, named Huanxian and Huachi, which highly depended on renewable emergy flow. Zhenyuan, Huanxian and Qingcheng were identified as being relatively emergy efficient, and the other five sub-regions have potential to reduce natural resource inputs and waste output to achieve the goal of efficiency. The results of decomposition analysis show that the economic growth, as well as the increased emergy yield ratio and population not accompanied by a sufficient increase of resource utilization efficiency are the main drivers of the unsustainable economic model in Qingyang and call for polices to promote the efficiency of resource utilization and to optimize natural resource use.

International Journal of Environmental Research and Public Health, May 15, 2020

Eco-efficiency enhancement is an inherent requirement of green development and an important indic... more Eco-efficiency enhancement is an inherent requirement of green development and an important indicator of high-quality development in general. It aims to achieve the coordinated development of nature, the economy, and society. Therefore, eco-efficiency measurements should focus on not only total factor input, but also process analysis. Based on the "full world" model in ecological economic theory, this study constructed a theoretical framework for a composite economic-environmental-social system that reflects human welfare and sustainability. To this end, using network data envelopment analysis (DEA), this study established a staged eco-efficiency evaluation model that uses economic, environmental, and social factors to measure the overall and staged eco-efficiency of China's provinces from 2003 to 2016 and analyze its spatiotemporal characteristics. A geographically weighted regression (GWR) model was also used to analyze the influencing factors of eco-efficiency changes and the spatial differentiation in their effect intensity. The findings were as follows: (1) China's overall eco-efficiency is still at a low level. It varies significantly from region to region, and only three regions are at the frontier of production. The eastern region has the highest eco-efficiency, followed by the central region, and the gap between the central and western regions has gradually narrowed. In terms of staged efficiency, the level of eco-efficiency in the production stage is less than in the environmental governance stage, which is less than that in the social input stage. (2) In terms of the efficiency of each stage, the efficiency level of the production stage showed a downward trend throughout the entire process, and the decline in the central and western regions was more obvious. The social input stage and the environmental governance stage both showed upward trends. The social input stage showed a higher level, and the increase was relatively flat during the period of study. Efficiency continued to rise during the environmental governance stage from 2003 to 2010 and rose overall, but with some fluctuations from 2011 to 2016. (3) Geographically weighted regression showed that the effects of the influencing factors on eco-efficiency had obvious spatial heterogeneity. The factors affecting overall, production stage, and social input eco-efficiency were, in order of effect intensity from high to low, economic growth level, marketization level, and social input level. In terms of environmental governance, social input level had the greatest impact, followed by economic growth; marketization level did not show a significant impact.

... The curve of the Emergy Sustainable Development Index(ESI) is nonstationary downtrend(Fig. 10... more ... The curve of the Emergy Sustainable Development Index(ESI) is nonstationary downtrend(Fig. 10), which is influenced by Net Emergy Yield Ratio(NEYR) and Environment Loading Ratio(ELR). ... [4] Ulgiati S, Brown M. Monitoring patterns of sustainability in natural and man-made ...

Page 1. Study on Meta Index in the Process of Evaluating Regional Sustainable Development Sponsor... more Page 1. Study on Meta Index in the Process of Evaluating Regional Sustainable Development Sponsored by: National Natural Science Foundation of China (40871061). LU Chenyu12 CHEN Xingpeng2 XUE Bing23 ZHANG Zilong2 ...

Abstract—Zhengning County in Gansu Province, the cradle of traditional farming culture, is abunda... more Abstract—Zhengning County in Gansu Province, the cradle of traditional farming culture, is abundant in coal resource and solar energy, but it is ecologically fragile and has significant ecological service function, therefore facing the dual pressure of resource exploitation and ...

Land

Eco-efficiency is a key indicator to measure the level of regional sustainable development. The c... more Eco-efficiency is a key indicator to measure the level of regional sustainable development. The county is the basic spatial unit of socio-economic activities and sustainable policy implementation in China. Hence, this paper conducts eco-efficiency analysis at the county scale in order to provide reference for the central and local governments to formulate differentiated eco-efficiency enhancement policies, further promote Chinese ecological sustainable development, and advance the construction of ecological civilization with high quality. Based on the Super-Slacks-Based Measure (SBM) model and the Malmquist index, the paper constructed an eco-efficiency measurement method and analyzed the variation characteristics, influencing factors, spatial pattern of eco-efficiency in Chinese counties from 2000 to 2020. The results showed that: (1) The eco-efficiency of the county unit was generally low in China and was roughly distributed in a pyramid. The county-level eco-efficiency had a spat...

International Journal of Environmental Research and Public Health, 2020

Eco-efficiency enhancement is an inherent requirement of green development and an important indic... more Eco-efficiency enhancement is an inherent requirement of green development and an important indicator of high-quality development in general. It aims to achieve the coordinated development of nature, the economy, and society. Therefore, eco-efficiency measurements should focus on not only total factor input, but also process analysis. Based on the “full world” model in ecological economic theory, this study constructed a theoretical framework for a composite economic-environmental-social system that reflects human welfare and sustainability. To this end, using network data envelopment analysis (DEA), this study established a staged eco-efficiency evaluation model that uses economic, environmental, and social factors to measure the overall and staged eco-efficiency of China’s provinces from 2003 to 2016 and analyze its spatiotemporal characteristics. A geographically weighted regression (GWR) model was also used to analyze the influencing factors of eco-efficiency changes and the spa...

Discrete Dynamics in Nature and Society, 2020

As the forerunner and policy test field of the sustainable development, the sustainable developme... more As the forerunner and policy test field of the sustainable development, the sustainable development pilot zones are an important strategy for China to explore the mechanism and model of the coordinated development of human and land in different regional units. However, the impact of sustainable development pilot zones, especially on the improvement of environmental efficiency, needs to be assessed. In this paper, 187 prefecture-level cities in China were taken as samples (22 sustainable development pilot zones and 165 nonpilot ones). Firstly, the environmental efficiency of 187 prefecture-level cities between 2006 and 2016 was measured by data envelopment analysis (DEA). Then, the effect of construction of sustainable development pilot zones on environmental efficiency was assessed using the difference-in-difference (DID) model. The assessment results were further verified by propensity score matching with difference-in-difference (PSM-DID). In addition, the impact mechanism of cons...

2011 International Conference on Computer Science and Service System (CSSS), 2011

ABSTRACT Based on GIS technique, this paper researched spatio-temporal evolvement of regional eco... more ABSTRACT Based on GIS technique, this paper researched spatio-temporal evolvement of regional economic pattern in Ningxia province from 1995 to 2009. It is considered that the IDW method is better to express spatial structure of regional economy by comparing different methods of spatial interpolation. According to the result of interpolation, the regional economic pattern is shown as a map by dividing the region into different economic zone. It shows that in recent 15 years the regional economic development is not balanced in Ningxia province. The disparity between south and north is obvious. The level and speed of economic development is degressive from north to south, so the structure of "north, middle and south" is formed. The stimulative effect of towns and traffic lines for regional economic development is better in the north than in the south.

2010 International Conference on Management and Service Science, 2010

Page 1. Study on Meta Index in the Process of Evaluating Regional Sustainable Development Sponsor... more Page 1. Study on Meta Index in the Process of Evaluating Regional Sustainable Development Sponsored by: National Natural Science Foundation of China (40871061). LU Chenyu12 CHEN Xingpeng2 XUE Bing23 ZHANG Zilong2 ...

Sustainability, 2014

Integrated analysis on socioeconomic metabolism could provide a basis for understanding and optim... more Integrated analysis on socioeconomic metabolism could provide a basis for understanding and optimizing regional sustainability. The paper conducted socioeconomic metabolism analysis by means of the emergy accounting method coupled with data envelopment analysis and decomposition analysis techniques to assess the sustainability of Qingyang city and its eight sub-region system, as well as to identify the major driving factors of performance change during 2000-2007, to serve as the basis for future policy scenarios. The results indicate that Qingyang greatly depended on non-renewable emergy flows and feedback (purchased) emergy flows, except the two sub-regions, named Huanxian and Huachi, which highly depended on renewable emergy flow. Zhenyuan, Huanxian and Qingcheng were identified as being relatively emergy efficient, and the other five sub-regions have potential to reduce natural resource inputs and waste output to achieve the goal of efficiency. The results of decomposition analysis show that the economic growth, as well as the increased emergy yield ratio and population not accompanied by a sufficient increase of resource utilization efficiency are the main drivers of the unsustainable economic model in Qingyang and call for polices to promote the efficiency of resource utilization and to optimize natural resource use.

Advanced Materials Research, 2011

Based on meta index theory, this paper proposes an indicator system and a synthetic assessment mo... more Based on meta index theory, this paper proposes an indicator system and a synthetic assessment model, which is used to assess the regional sustainable development on county level for Qingyang. And then, the paper respectively analyzes the characters of temporal and spatial evolvement on the subregional sustainable development in Qingyang from 1990 to 2008. The outcome shows that the integrated sustainability as a whole increased gradually from 1990 to 2008, where the driving force is due to the rapid growing of the economy and society along with the cost of abundant resources consumption and ecosystem degradation. At present, the integrated sustainability in some counties began to decrease.

Optics Express, 2015

Emission of the two electrons released from nonsequential double ionization of argon atoms is ant... more Emission of the two electrons released from nonsequential double ionization of argon atoms is anticorrelated at lower laser intensities but is correlated at higher laser intensities. Such a transition is caused by the momentum change of recollision-induced-ionization (RII) electrons. At lower laser intensities, the Coulomb repulsion between the two RII electrons dominates the motion of electrons and pushes them leaving the laser field back-to-back. At higher laser intensities, the drift momentum obtained from the laser field dominates the motion of electrons and drives them leaving the laser field side-by-side.

The Journal of biological chemistry, Jan 3, 2014

The committed step of leucine biosynthesis, converting acetyl-CoA and α-ketoisovalerate into α-is... more The committed step of leucine biosynthesis, converting acetyl-CoA and α-ketoisovalerate into α-isopropylmalate, is catalyzed by α-isopropylmalate synthase (IPMS), an allosteric enzyme subjected to feedback inhibition by the end product L-leucine. We characterized the short form IPMS from Leptospira biflexa (LbIPMS2), which exhibits a catalytic activity comparable with that of the long form IPMS (LbIPMS1) and has a similar N-terminal domain followed by subdomain I and subdomain II but lacks the whole C-terminal regulatory domain. We found that partial deletion of the regulatory domain of LbIPMS1 resulted in a loss of about 50% of the catalytic activity; however, when the regulatory domain was deleted up to Arg-385, producing a protein that is almost equivalent to the intact LbIPMS2, about 90% of the activity was maintained. Moreover, in LbIPMS2 or LbIPMS1, further deletion of several residues from the C terminus of subdomain II significantly impaired or completely abolished the catal...

Sustainability, 2014

As the largest solid waste (SW) generator in the world, China is facing serious pollution issues ... more As the largest solid waste (SW) generator in the world, China is facing serious pollution issues induced by increasing quantities of SW. The sustainability assessment of SW management is very important for designing relevant policy for further improving the overall efficiency of solid waste management (SWM). By focusing on industrial solid waste (ISW) and municipal solid waste (MSW), the paper investigated the sustainability performance of SWM by applying decoupling analysis, and further identified the main drivers of SW change in China by adopting Logarithmic Mean Divisia Index (LMDI) model. The results indicate that China has made a great achievement in SWM which was specifically expressed as the increase of ISW utilized amount and harmless disposal ratio of MSW, decrease of industrial solid waste discharged (ISWD), and absolute decoupling of ISWD from economic growth as well. However, China has a long way to go to achieve the goal of sustainable management of SW. The weak decoupling, even expansive negative decoupling of ISW generation and MSW disposal suggests that China needs timely technology innovation and rational institutional arrangement to reduce SW intensity from

Resources Conservation and Recycling, 2010

With rapid industrialization in China, both resource scarcity and resources efficiency have chall... more With rapid industrialization in China, both resource scarcity and resources efficiency have challenged the country's sustainable development. Under such circumstance, circular economy should be adopted as a national development strategy. However, due to a lack ...

2011 Asia-Pacific Power and Energy Engineering Conference, 2011

Ecological Footprint model is an important method to evaluate the sustainability of regional deve... more Ecological Footprint model is an important method to evaluate the sustainability of regional development. This paper assesses the area demand of Ningxia Hui Autonomous Region by calculates the Ecological Footprint and the Ecological Carrying Capacity in the 20 years from 1986 to 2005.The results show that Ecological Deficits occurred and then continued to increase, which demonstrate that great human-environment conflicts