During the underground mining of coal resources,overlying rocks on the roof of excavated tunnels will be destroyed due to ground pressure,and as a result,part of them will break and fall into the tunnels.How to determ...During the underground mining of coal resources,overlying rocks on the roof of excavated tunnels will be destroyed due to ground pressure,and as a result,part of them will break and fall into the tunnels.How to determine the distribution of fractured areas and fissures presents a major problem for preserving the overlying aquifer.展开更多
To make full use of Chinese natural heritage resources and achieve their sustainable development, it is imperative and necessary to construct Chinese National Park System. Based on the theory of sustainable developmen...To make full use of Chinese natural heritage resources and achieve their sustainable development, it is imperative and necessary to construct Chinese National Park System. Based on the theory of sustainable development and the connotation of national park, this paper will discuss the signifi cance of establishing Chinese National Park System and then propose some measures. Chinese National Park System can be constructed from four levels, including policy, management, economic and social levels, and through such ways as reconstructing the national conservation system, making laws and regulations, establishing planning system, setting up independent and specialized regulatory agency, adopting way of franchising, innovating funding investment mechanisms and establishing mechanisms of public participation.展开更多
Theory is necessary to science and science grounds legitimate and essential practice. This is true for Nursing as a discipline of knowledge and a practicing profession. Nevertheless, should all science or research wit...Theory is necessary to science and science grounds legitimate and essential practice. This is true for Nursing as a discipline of knowledge and a practicing profession. Nevertheless, should all science or research within a scientific field be focused on theoretical development and testing? Currently, various nursing theories exist to describe and explain the phenomena of nursing. Often, the development of nursing theory is in response to advancing ontologies and epistemologies of nursing. The advent of technology is one of these advances challenging the professional practice of nursing. How will nursing practice be made visible and realistic in the face of traditional nursing care practice? Nursing practice processes, derived from theories of nursing, provide opportunities for demonstrating practice grounded in the science of nursing. The purpose of this article is to describe the development of the emergent theory of Aesthetic Nursing Practice, focus on illuminating caring for person through the process of encountering, co-creating caring relationships, and meaningful engaging between the nurse and nursed through caring encounters occurring in caring situations. Five assumptions and a model of practice are described. As a contemporary theory of Nursing, it describes caring for persons who remain wholes and enhance their well-being.展开更多
Although much research has been conducted on the interactions between the career development of foreign language teachers and their contexts around the world,a literature review reveals that there exists scanty resear...Although much research has been conducted on the interactions between the career development of foreign language teachers and their contexts around the world,a literature review reveals that there exists scanty research on the relationship between university Russian language teachers’career development and their contexts in China since 1949.Based on relevant studies on the career development of foreign language teachers and the ecological theory,this paper involves research on the impact that different ecological systems(micro-,meso-,macro-and exo-ones)have played in the career development of Russian language teachers in China.Participants are 10 Chinese Russian teachers of different ages from different universities in different parts of China.Via literature review,narration methods and semi-structured(in-depth)interviews with the help of NVivo,this research finds that Russian language teachers’career development results from multi-faceted interactions of the following contexts:ideology,Russian language educational policies and personal factors as well as college contexts.This paper concludes with some suggestions for improving Russian language teachers’career development in China.展开更多
Transportation is the lifeline of human civilization and an important component of the infrastructure for economic growth.As transportation is closely related to regional economic development,the summarization of Chin...Transportation is the lifeline of human civilization and an important component of the infrastructure for economic growth.As transportation is closely related to regional economic development,the summarization of China's transportation development theory from the perspective of regional economics will be conducive to clarifying the relationships between transportation and regional economic development and providing basic theoretical support for regional economic research and policy application.From the perspective of regional economics,China’s transportation development theory falls into two categories:transportation resource allocations,and the interactions between transportation and economic development.In recent years,there has been a trend toward the integration of transportation development research with regional economic growth,and a deeper understanding of the relationships between them has been achieved.展开更多
The practice of human rights in contemporary China puts forward an urgent demand for the innovation in human rights theories.On the basis of summarizing the practice of human rights in contemporary China,the developme...The practice of human rights in contemporary China puts forward an urgent demand for the innovation in human rights theories.On the basis of summarizing the practice of human rights in contemporary China,the developmental theory of human rights holds that human rights are the value consensus and social norms fostered by the common crisis faced by all human beings under the background of globalization of market economy.The free,comprehensive and harmonious development of all people is the ultimate goal of human rights.Taking the right to human development"as a purposive right can provide more enlightening explanations for the relational structure of human rights.展开更多
We feel a great honor and heavy responsibil- ity upon the Human Rights Research Center at Shandong University being named one of China's national human rights education and training bases. In our view, national huma...We feel a great honor and heavy responsibil- ity upon the Human Rights Research Center at Shandong University being named one of China's national human rights education and training bases. In our view, national human rights education and training bases should keep up with the times, bring into full play their ad- vantages of uniqueness and openness, complement each other, make con- certed efforts to achieve innovation and vigorously boost the development of Chinese human rights theory and practice. The university center will continue to bring into play its tradi- tional strength in theoretical research and graduate education and work hard to fulfill all the tasks of the center. It will focus on the following work.展开更多
Purpose:What factors influence conscious consumerism,especially related to race and gender identities?This scholarship explores three white women-led social responsibility organizations’(SROs)aspirations to encourage...Purpose:What factors influence conscious consumerism,especially related to race and gender identities?This scholarship explores three white women-led social responsibility organizations’(SROs)aspirations to encourage conscious consumerism as well as factors that influence conscious consumerism.Design/methodology/approach:Using the Black feminist thought and sustainability development theory,the data were analyzed using a thematic analysis to explore the activation of the white savior industrial complex(WSIC)in SROs.Interviews provided in-depth knowledge of the SRO culture including,but not limited to,insight on social exclusion and partnerships.Findings:Noonday Collection,Sseko Designs,and Trades of Hope,all SROs,aspire to be dedicated to people,planet,and profit and encourage conscious consumerism as a means for their customer base and sales consultants to“do their part”,and yet,an unintended consequence of the SROs’work is social exclusion and white saviorism.Originality:This scholarship investigates what can be done to dismantle the overreliance of conscious consumerism in an effort to finally strip white saviorism,and its role in the white savior industrial complex(WSIC),of its power.展开更多
This paper explores children's language acquisition process and its application in educational practice based on Piaget's theory of cognitive development.Piaget's theory emphasizes that children's cogn...This paper explores children's language acquisition process and its application in educational practice based on Piaget's theory of cognitive development.Piaget's theory emphasizes that children's cognitive abilities develop progressively through different stages,from sensorimotor to concrete operational stages.Children's language acquisition progresses from simple to complex and from concrete to abstract during these stages.The paper integrates theoretical discussions on how to design effective language teaching strategies according to children's cognitive development characteristics to promote their language proficiency and overall cognitive development.展开更多
Theories established from engineering fundamentals have been of great value in supporting the design and execution of drilling operations in gas drilling where gas is used as a drilling fluid.This work presents an ove...Theories established from engineering fundamentals have been of great value in supporting the design and execution of drilling operations in gas drilling where gas is used as a drilling fluid.This work presents an overview of new theories developed in recent years for special gas drilling operations including horizontal wells.These new theories are found in the areas of gas-mixture flow hydraulics in deviated and horizontal boreholes,hole cleaning of solids accumulation,hole cleaning of formation water,flow diverging for washout control,bit orifice optimization,and depression of formation water influx.This paper provides drilling engineers with updated mathematical models and methods for optimizing design to improve gas drilling performance.展开更多
The research reviewed the development trend of vertical greening industry and divided it into four stages as follows: demand exploring phase, theory and technology development and application phases, and ripening pha...The research reviewed the development trend of vertical greening industry and divided it into four stages as follows: demand exploring phase, theory and technology development and application phases, and ripening phase of vertical greening system. The characteristics in different phases were detailed, providing ref- erences for development of vertical greening industry in future.展开更多
The goal of sustainoble development is to preserve sustainabitity trod simultaneously prevent catastrophe in a man-land .system. However, almost all the existing approaches to assessing sustainable development are to ...The goal of sustainoble development is to preserve sustainabitity trod simultaneously prevent catastrophe in a man-land .system. However, almost all the existing approaches to assessing sustainable development are to measure the sustainability. namely appraise from the obverse side of the sustainable development. So it seems necessary to attack the same task on the reverse, namely to measure the passibility of eatostrophe. In this paper, with a case study of Tianjin, China. we employ catastrophe theory and models to integrate Tianjin's sustainable development indicators, and then deduce the catastrophe risk index ( CRI) to present the level of catastrophic possibility in the city. Applying catastrophe theory, is a new strategy to assess sustainable development and shows great practical significance, especially for those developing regions or countries, who always give more priority to their economy and therefore have more obligation to make sure whether their social economic activities might bring forth any ecological environment catastrophe. Besides, being both qualitative and quantitative, the approach could be employed to explore not only static characteristics bat also dynamic mechanism of man-land system. Although our work is only a maiden attempt and still calls for further effort to improve it, the case study of Tianjin in this paper would assure as the great promising future to apply, catastrophe theory to sustoinable devetopment modeling,展开更多
The special geographical location and political system of the Guangdong-Hong Kong-Macao Greater Bay Area and the international background of coexistence of multiple cultures have strong basic strengths and internation...The special geographical location and political system of the Guangdong-Hong Kong-Macao Greater Bay Area and the international background of coexistence of multiple cultures have strong basic strengths and international advantages in education and talents,and have the rigid conditions for the development of education and talents gathering.The rapid development of the Guangdong-Hong Kong-Macao Greater Bay Area has brought rare opportunities and challenges to private higher education in Guangdong.This study analyzes the significance of private higher education for the development of the Bay Area from the perspective of sustainable development theory,and proposes corresponding strategies for high-quality development.展开更多
The report of the 18th National Congress of the Communist Party of China (CPC) set "respecting and ensuring human rights" as an important goal of development and reform in China, thus siniciz ing the latest Marxis...The report of the 18th National Congress of the Communist Party of China (CPC) set "respecting and ensuring human rights" as an important goal of development and reform in China, thus siniciz ing the latest Marxist human rights theories and reflecting major in novations and developments made by the CPC in the field of human rights theory. I. Human Rights as a Core Idea and Important Goal of Social Development Human rights are integral to the pursuit of the core value of socialism and to the core idea of socialism with Chinese characteristics. The report of the 18th CPC National Congress summarized the new progress and experience of human rights advance ment in recent years in China by setting "respecting and ensuring hu man rights" as an important goal of China as it completes the building of a moderately prosperous society.展开更多
The reasons for choosing this topic are two: 1) Vocabulary development is the primeconcern for both learners and teachers of a foreign language; 2) Personal teaching experiencehas often challenged me with the question...The reasons for choosing this topic are two: 1) Vocabulary development is the primeconcern for both learners and teachers of a foreign language; 2) Personal teaching experiencehas often challenged me with the question how to develop vocabualry more effectively. Thegeneral objective of this writing is to generalize some enlightening information on the specificarea of vocabulary learning and instruction and to bring forward some ideas practical to ourteaching situation.展开更多
After the 18th CPC National Congress,urbanization regained its importance.As villages become heterogeneously urbanized,rural industrialization is reiterated for town urbanization.Yet all the historically famous models...After the 18th CPC National Congress,urbanization regained its importance.As villages become heterogeneously urbanized,rural industrialization is reiterated for town urbanization.Yet all the historically famous models for Zhujiang,Sunan and Wenzhou in the progress of rural industrialization encountered dilemmas.Is the modernization theory sound in dictating that latecomers cannot achieve urbanization through rural industrialization?The author discusses the origination of the industrialization and urbanization of Hebei villages which is considered to represent the vision of British industrial revolution.There are two implications:(1)Town urbanization requires rural industrialization as its base,which must not rely completely on external industries and being urbanized top-down,but rather on the development of internal economic and social forces;(2)Urbanization cannot evolve spontaneously on the basis of rural industrialization.Instead,it is the result of conscious common planning and construction pushed by multiple forces.Therefore,the government should,in accordance with the law of development,provide guidance that mitigates various issues in the process of development.展开更多
Various kinds of human disturbances on cropland are the main reasons for soil erosion and land degradation.Farming practices in mountainous areas vary greatly among cropland plots because of the heterogeneity of bioph...Various kinds of human disturbances on cropland are the main reasons for soil erosion and land degradation.Farming practices in mountainous areas vary greatly among cropland plots because of the heterogeneity of biophysical conditions and differences in farmers'management behavior.The main purpose of this paper is to develop a composite index of cropland physical disturbance intensity(CLDI)to reflect the plot-scale discrepancy of potential soil erosion in mountainous areas.The study was based on both plot survey and household interview data,collected from six typical catchments in mountainous areas of southwestern China.Four kinds of physical disturbance practices and two kinds of conservation practices during one crop rotation period were synthesized to develop the CLDI index.The rough set theory was referenced to avoid subjectivity during weight allocation.The results show that conventional tillage,deep fertilization,and manual weeding are the main causes of cropland soil erosion,whereas manure application in combination with seasonal fallow reduces soil erosion.Different crop types as well as cropland location factors determine the spatial pattern of CLDI.Crop rotation modes with major crops of tobacco and maize resulted in a maximal CLDI,and cropland plots with a distance radius of 150 meters away from households received the most intensive physical disturbance.These results are critical to help better protect rural environments in mountainous areas.Based on the results,methods to reduce cropland soil erosion are suggested.展开更多
The hot accretion flow model was re-discovered in 1994 by Narayan and collaborators.Intensive theoretical works have been conducted and significant progresses have been achieved.In this paper,we review several develop...The hot accretion flow model was re-discovered in 1994 by Narayan and collaborators.Intensive theoretical works have been conducted and significant progresses have been achieved.In this paper,we review several developments in the past ten years.This mainly includes the finding of outflow and convection and its dynamical effect on inflow;the direct electron heating by viscous dissipation;the effect of large scale toroidal magnetic fields in the inner region of the accretion flow;and the effect of global Compton scattering.Their observational applications are also introduced very briefly.展开更多
基金supported by the State Key Program of National Natural Science of China(Grant No.41130637)
文摘During the underground mining of coal resources,overlying rocks on the roof of excavated tunnels will be destroyed due to ground pressure,and as a result,part of them will break and fall into the tunnels.How to determine the distribution of fractured areas and fissures presents a major problem for preserving the overlying aquifer.
基金Sponsored by National Social Science Fund(14CGL020)
文摘To make full use of Chinese natural heritage resources and achieve their sustainable development, it is imperative and necessary to construct Chinese National Park System. Based on the theory of sustainable development and the connotation of national park, this paper will discuss the signifi cance of establishing Chinese National Park System and then propose some measures. Chinese National Park System can be constructed from four levels, including policy, management, economic and social levels, and through such ways as reconstructing the national conservation system, making laws and regulations, establishing planning system, setting up independent and specialized regulatory agency, adopting way of franchising, innovating funding investment mechanisms and establishing mechanisms of public participation.
文摘Theory is necessary to science and science grounds legitimate and essential practice. This is true for Nursing as a discipline of knowledge and a practicing profession. Nevertheless, should all science or research within a scientific field be focused on theoretical development and testing? Currently, various nursing theories exist to describe and explain the phenomena of nursing. Often, the development of nursing theory is in response to advancing ontologies and epistemologies of nursing. The advent of technology is one of these advances challenging the professional practice of nursing. How will nursing practice be made visible and realistic in the face of traditional nursing care practice? Nursing practice processes, derived from theories of nursing, provide opportunities for demonstrating practice grounded in the science of nursing. The purpose of this article is to describe the development of the emergent theory of Aesthetic Nursing Practice, focus on illuminating caring for person through the process of encountering, co-creating caring relationships, and meaningful engaging between the nurse and nursed through caring encounters occurring in caring situations. Five assumptions and a model of practice are described. As a contemporary theory of Nursing, it describes caring for persons who remain wholes and enhance their well-being.
文摘Although much research has been conducted on the interactions between the career development of foreign language teachers and their contexts around the world,a literature review reveals that there exists scanty research on the relationship between university Russian language teachers’career development and their contexts in China since 1949.Based on relevant studies on the career development of foreign language teachers and the ecological theory,this paper involves research on the impact that different ecological systems(micro-,meso-,macro-and exo-ones)have played in the career development of Russian language teachers in China.Participants are 10 Chinese Russian teachers of different ages from different universities in different parts of China.Via literature review,narration methods and semi-structured(in-depth)interviews with the help of NVivo,this research finds that Russian language teachers’career development results from multi-faceted interactions of the following contexts:ideology,Russian language educational policies and personal factors as well as college contexts.This paper concludes with some suggestions for improving Russian language teachers’career development in China.
文摘Transportation is the lifeline of human civilization and an important component of the infrastructure for economic growth.As transportation is closely related to regional economic development,the summarization of China's transportation development theory from the perspective of regional economics will be conducive to clarifying the relationships between transportation and regional economic development and providing basic theoretical support for regional economic research and policy application.From the perspective of regional economics,China’s transportation development theory falls into two categories:transportation resource allocations,and the interactions between transportation and economic development.In recent years,there has been a trend toward the integration of transportation development research with regional economic growth,and a deeper understanding of the relationships between them has been achieved.
基金the research report of“New Developments of the Theory and Practice of Socialist Theory of Human Rights with Chinese Characteristics since the 18th National Congress of the Communist Party of China”of the Marxist Theory Research and Construction Project“Research on Several Major Basic Theories of Human Rights”
文摘The practice of human rights in contemporary China puts forward an urgent demand for the innovation in human rights theories.On the basis of summarizing the practice of human rights in contemporary China,the developmental theory of human rights holds that human rights are the value consensus and social norms fostered by the common crisis faced by all human beings under the background of globalization of market economy.The free,comprehensive and harmonious development of all people is the ultimate goal of human rights.Taking the right to human development"as a purposive right can provide more enlightening explanations for the relational structure of human rights.
文摘We feel a great honor and heavy responsibil- ity upon the Human Rights Research Center at Shandong University being named one of China's national human rights education and training bases. In our view, national human rights education and training bases should keep up with the times, bring into full play their ad- vantages of uniqueness and openness, complement each other, make con- certed efforts to achieve innovation and vigorously boost the development of Chinese human rights theory and practice. The university center will continue to bring into play its tradi- tional strength in theoretical research and graduate education and work hard to fulfill all the tasks of the center. It will focus on the following work.
文摘Purpose:What factors influence conscious consumerism,especially related to race and gender identities?This scholarship explores three white women-led social responsibility organizations’(SROs)aspirations to encourage conscious consumerism as well as factors that influence conscious consumerism.Design/methodology/approach:Using the Black feminist thought and sustainability development theory,the data were analyzed using a thematic analysis to explore the activation of the white savior industrial complex(WSIC)in SROs.Interviews provided in-depth knowledge of the SRO culture including,but not limited to,insight on social exclusion and partnerships.Findings:Noonday Collection,Sseko Designs,and Trades of Hope,all SROs,aspire to be dedicated to people,planet,and profit and encourage conscious consumerism as a means for their customer base and sales consultants to“do their part”,and yet,an unintended consequence of the SROs’work is social exclusion and white saviorism.Originality:This scholarship investigates what can be done to dismantle the overreliance of conscious consumerism in an effort to finally strip white saviorism,and its role in the white savior industrial complex(WSIC),of its power.
文摘This paper explores children's language acquisition process and its application in educational practice based on Piaget's theory of cognitive development.Piaget's theory emphasizes that children's cognitive abilities develop progressively through different stages,from sensorimotor to concrete operational stages.Children's language acquisition progresses from simple to complex and from concrete to abstract during these stages.The paper integrates theoretical discussions on how to design effective language teaching strategies according to children's cognitive development characteristics to promote their language proficiency and overall cognitive development.
基金financially supported by the National Natural Science Foundation of China through Grants No. 51221003, No. 51134004 and No. 51274220
文摘Theories established from engineering fundamentals have been of great value in supporting the design and execution of drilling operations in gas drilling where gas is used as a drilling fluid.This work presents an overview of new theories developed in recent years for special gas drilling operations including horizontal wells.These new theories are found in the areas of gas-mixture flow hydraulics in deviated and horizontal boreholes,hole cleaning of solids accumulation,hole cleaning of formation water,flow diverging for washout control,bit orifice optimization,and depression of formation water influx.This paper provides drilling engineers with updated mathematical models and methods for optimizing design to improve gas drilling performance.
基金Supported by Shenzhen Urban Management Science Research Fund(201208-1)~~
文摘The research reviewed the development trend of vertical greening industry and divided it into four stages as follows: demand exploring phase, theory and technology development and application phases, and ripening phase of vertical greening system. The characteristics in different phases were detailed, providing ref- erences for development of vertical greening industry in future.
文摘The goal of sustainoble development is to preserve sustainabitity trod simultaneously prevent catastrophe in a man-land .system. However, almost all the existing approaches to assessing sustainable development are to measure the sustainability. namely appraise from the obverse side of the sustainable development. So it seems necessary to attack the same task on the reverse, namely to measure the passibility of eatostrophe. In this paper, with a case study of Tianjin, China. we employ catastrophe theory and models to integrate Tianjin's sustainable development indicators, and then deduce the catastrophe risk index ( CRI) to present the level of catastrophic possibility in the city. Applying catastrophe theory, is a new strategy to assess sustainable development and shows great practical significance, especially for those developing regions or countries, who always give more priority to their economy and therefore have more obligation to make sure whether their social economic activities might bring forth any ecological environment catastrophe. Besides, being both qualitative and quantitative, the approach could be employed to explore not only static characteristics bat also dynamic mechanism of man-land system. Although our work is only a maiden attempt and still calls for further effort to improve it, the case study of Tianjin in this paper would assure as the great promising future to apply, catastrophe theory to sustoinable devetopment modeling,
基金Research on the Issue of National Identity Education in Guangdong Colleges and Universities Promoting the Return of Young Students in Hong Kong Under the Perspective of Branding Vision,Research Project of Party Building in Study Conference of Party Building in Guangdong Colleges and Universities in 2019(project No.:2020MB015)person-in-charge of the projectAnalysis on the Brand Development Strategy of Independent Colleges Guided by Party Construction,Key Research Topics of Party Building and Ideological and Political Education of Zhuhai College of Jilin University in 2019(project No.:2019JZDJ001),person-in-charge of the project.
文摘The special geographical location and political system of the Guangdong-Hong Kong-Macao Greater Bay Area and the international background of coexistence of multiple cultures have strong basic strengths and international advantages in education and talents,and have the rigid conditions for the development of education and talents gathering.The rapid development of the Guangdong-Hong Kong-Macao Greater Bay Area has brought rare opportunities and challenges to private higher education in Guangdong.This study analyzes the significance of private higher education for the development of the Bay Area from the perspective of sustainable development theory,and proposes corresponding strategies for high-quality development.
文摘The report of the 18th National Congress of the Communist Party of China (CPC) set "respecting and ensuring human rights" as an important goal of development and reform in China, thus siniciz ing the latest Marxist human rights theories and reflecting major in novations and developments made by the CPC in the field of human rights theory. I. Human Rights as a Core Idea and Important Goal of Social Development Human rights are integral to the pursuit of the core value of socialism and to the core idea of socialism with Chinese characteristics. The report of the 18th CPC National Congress summarized the new progress and experience of human rights advance ment in recent years in China by setting "respecting and ensuring hu man rights" as an important goal of China as it completes the building of a moderately prosperous society.
文摘The reasons for choosing this topic are two: 1) Vocabulary development is the primeconcern for both learners and teachers of a foreign language; 2) Personal teaching experiencehas often challenged me with the question how to develop vocabualry more effectively. Thegeneral objective of this writing is to generalize some enlightening information on the specificarea of vocabulary learning and instruction and to bring forward some ideas practical to ourteaching situation.
基金Sponsored by Youth Program of 2013 Humanities and Social Sciences Research Fund of the Ministry of Education(13YJC840018)
文摘After the 18th CPC National Congress,urbanization regained its importance.As villages become heterogeneously urbanized,rural industrialization is reiterated for town urbanization.Yet all the historically famous models for Zhujiang,Sunan and Wenzhou in the progress of rural industrialization encountered dilemmas.Is the modernization theory sound in dictating that latecomers cannot achieve urbanization through rural industrialization?The author discusses the origination of the industrialization and urbanization of Hebei villages which is considered to represent the vision of British industrial revolution.There are two implications:(1)Town urbanization requires rural industrialization as its base,which must not rely completely on external industries and being urbanized top-down,but rather on the development of internal economic and social forces;(2)Urbanization cannot evolve spontaneously on the basis of rural industrialization.Instead,it is the result of conscious common planning and construction pushed by multiple forces.Therefore,the government should,in accordance with the law of development,provide guidance that mitigates various issues in the process of development.
基金jointly funded by the National Key Basic Research Program of China (973 program) (Grant NO.2015CB452702)the National Natural Science Foundation of China (Grant NO.41371539)partially supported by the CDM Fund Grant Project in China (Grant NO. 2013030)
文摘Various kinds of human disturbances on cropland are the main reasons for soil erosion and land degradation.Farming practices in mountainous areas vary greatly among cropland plots because of the heterogeneity of biophysical conditions and differences in farmers'management behavior.The main purpose of this paper is to develop a composite index of cropland physical disturbance intensity(CLDI)to reflect the plot-scale discrepancy of potential soil erosion in mountainous areas.The study was based on both plot survey and household interview data,collected from six typical catchments in mountainous areas of southwestern China.Four kinds of physical disturbance practices and two kinds of conservation practices during one crop rotation period were synthesized to develop the CLDI index.The rough set theory was referenced to avoid subjectivity during weight allocation.The results show that conventional tillage,deep fertilization,and manual weeding are the main causes of cropland soil erosion,whereas manure application in combination with seasonal fallow reduces soil erosion.Different crop types as well as cropland location factors determine the spatial pattern of CLDI.Crop rotation modes with major crops of tobacco and maize resulted in a maximal CLDI,and cropland plots with a distance radius of 150 meters away from households received the most intensive physical disturbance.These results are critical to help better protect rural environments in mountainous areas.Based on the results,methods to reduce cropland soil erosion are suggested.
基金supported by the National Natural Science Foundation of China (Grant Nos. 10773024, 10833002, 10821302, and 10825314)the Bairen Program of the Chinese Academy of Sciences,and the National Basic Research Program of China (Grant No. 2009CB824800)
文摘The hot accretion flow model was re-discovered in 1994 by Narayan and collaborators.Intensive theoretical works have been conducted and significant progresses have been achieved.In this paper,we review several developments in the past ten years.This mainly includes the finding of outflow and convection and its dynamical effect on inflow;the direct electron heating by viscous dissipation;the effect of large scale toroidal magnetic fields in the inner region of the accretion flow;and the effect of global Compton scattering.Their observational applications are also introduced very briefly.