Since industrial revolution, the atmospheric CO2 concentration has kept a continuous increase by more than 2.2 ppm yr^-1, and approaches to almost 400 ppm at present (Jouzel 2012). China has become the largest count...Since industrial revolution, the atmospheric CO2 concentration has kept a continuous increase by more than 2.2 ppm yr^-1, and approaches to almost 400 ppm at present (Jouzel 2012). China has become the largest country of greenhouse gas emission (GHG), and confronts with great challenge to mitigate GHG.展开更多
The ecosystem services are material base and natural capital for sustainable development of human being. Valuation of ecosystem services is favorable for people realizing the importance of natural ecosystem to human b...The ecosystem services are material base and natural capital for sustainable development of human being. Valuation of ecosystem services is favorable for people realizing the importance of natural ecosystem to human being, and considering its long-term influence on sustainable development of human society when making decisions. Besides, it is an attempt of ecology, geography and other natural sciences to influence social decision process by economic methods. The Value of the World's Ecosystem Services and Natural Capital, written by Robert Costanza et al., in 1997, is generally regarded as a masterpiece for the research of valuing ecosystem services. However, the classifying standard of ecosystem services, the method of various services summation and the purpose for static global value, had confronted many criticisms. Still to now, accurately valuing ecosystem services is not easy, because of the complexity of natural ecosystem, the weak capability of economic system to pricing ecosystem services and the lack of more study in this field. Based on the criticisms summarizing and comprehensive analysis, further study suggestions of ecosystem services valuation is presented: multi-scale integrated and community participation applied in evaluation, dynamic changes of material value and intangible value of ecosystem services, investigation and simulation studies of the marginal value when ecosystem services changed, associated with related areas like ecological compensation research, and research on the market-oriented evaluation of ecosystem's intangible values.展开更多
In recent years, a large number of geotechnical engineering projectshave been completed or under construction in China, such asthe Three Gorges Dam Project, Expressway Network Plan, South-to-North Water Diversion Proj...In recent years, a large number of geotechnical engineering projectshave been completed or under construction in China, such asthe Three Gorges Dam Project, Expressway Network Plan, South-to-North Water Diversion Project, West-to-East Gas Pipeline Project,etc. (Wang, 2003; Li, 2010; Huang, 2011; She and Lin, 2014). Theconstruction of large-scale geotechnical engineering not onlybrings huge economic benefits, but also causes large interferenceto the lithosphere and hydrosphere that we rely on for survival(Wang et al., 2005). This paper focuses on the interaction mechanismof rock engineering and geo-environments in the fields of urbanunderground space utilization, natural gas hydrate exploitationand high-level radioactive waste disposal.展开更多
Background: Galliformes are widely distributed throughout the world and economically important to humans as domesticated animals or gamebirds. They are at a unique position for advancing knowledge and techniques of wi...Background: Galliformes are widely distributed throughout the world and economically important to humans as domesticated animals or gamebirds. They are at a unique position for advancing knowledge and techniques of wildlife conservation as the barometer of the status of applied ecology. Populations of many galliform species have declined mainly due to habitat loss and over-hunting. An assessment of knowledge of Galliformes could help to provide guidelines for future research and conservation strategies.Methods: Using the Web of Science search engine, we conducted a literature review of galliform-related articles published from 1990 to 2016. We used the "research area" option to filter articles focused on the zoology, environmental sciences ecology, biodiversity conservation, forestry, behavioral sciences, reproductive biology, biochemistry and molecular biology, cell biology, genetics and heredity, evolutionary biology, physiology and developmental biology. We then checked duplication based on the title, abstract and full text. In addition, we examined the reference lists of selected studies to include the publications that were missed by above searching.Results: We retained 1874 articles related to the Galliformes from the initial 243,128 publications that were found. About 91.4% focused on one or two species, and 85.0% were conducted within a short duration, typically 1–2 years. The majority of the articles concentrated on macroscopic ecology(55.5%), mainly focusing on habitat selection or habitat use. With recent advances of molecular biology, the studies of taxonomy and phylogenetics rose quickly in last two decades. The study of physiology and biochemistry was no longer limited to simple description but expanded to the mechanisms of phenotype and micro-evolutionary potential. An additional area receiving increasing attention is the conservation of Galliformes, with the assessment of the conservation status and conservation management effectiveness of Galliformes(e.g. species diversity and genetic diversity) becoming the focus.Conclusions: The studies on Galliformes have made great achievements since 1990, but there are still gaps, particularly in macroscopic ecology, molecular genetics, and conservation. There is an urgent need to enhance long-term monitoring and analysis of population dynamics, and applying different disciplines to galliform conservation. Moreover, life history information of many galliform species is still lacking, which has hindered conservation efforts and effectiveness. In addition, multidiscipline studies and new technologies are not common for galliform studies, and should be encouraged.展开更多
In this paper, the backdrop and significance of the research of germ-remaining rice whitener firstly were expatiated. Then, the study progress in China and overseas was summarized. Lastly, the research prospect of thi...In this paper, the backdrop and significance of the research of germ-remaining rice whitener firstly were expatiated. Then, the study progress in China and overseas was summarized. Lastly, the research prospect of this kind of whitener in China was analyzed. It is hoped that it can coach the design of germ-remaining rice whitener.展开更多
Data announced by the Chinese Ministry of Land and Resources in 2015 suggest that China has discovered more than 480 manganese ore-producing areas, with manganese ore resource reserves up to 1.22 billion tons, includi...Data announced by the Chinese Ministry of Land and Resources in 2015 suggest that China has discovered more than 480 manganese ore-producing areas, with manganese ore resource reserves up to 1.22 billion tons, including 0.303 billion tons of basic reserves and 0.915 billion tons amount of resource. Among these reserves, manganese carbonate ores account for 56%, manganese oxide ores (including spongy manganese ores) accounts for 25%, and other types of manganese ore occupy 19%. Rich ores with 〉30% manganese content only account for 5% of the total resource amount, and the remaining 95% are poor manganese ores. Since 1983 when China first began to import, the imported manganese ores have increased annually by 25%. In 2001, the annual imported manganese ores reached 1.71 million tons. From 2010, the annual imported manganese ores increased by greater than 45%, reaching up to 12 million tons in 2015. Thus it seemed that the shortage of manganese ore resources will be a longterm phenomenon for China's economic development.展开更多
The Central Iron and Steel Research Institute(CISRI),directly under the Ministry of Metallurgical Industry(MMI),is a comprehensive research institute mainly engaged in the research and development of new metallic mate...The Central Iron and Steel Research Institute(CISRI),directly under the Ministry of Metallurgical Industry(MMI),is a comprehensive research institute mainly engaged in the research and development of new metallic materials and new iron and steel process.With the rapid development of China’s iron and steel industry,CISRI has also made a great progress since it was established more than 40 years ago.In 1994,the steel output of展开更多
From the perspective of bibliometric analysis, based on the data of 286 related literature retrieved and screened in the CNKI database, coOC software is used for data processing, and the relevant knowledge graphs such...From the perspective of bibliometric analysis, based on the data of 286 related literature retrieved and screened in the CNKI database, coOC software is used for data processing, and the relevant knowledge graphs such as the amount of publication, authors, and keywords in the field of third-line heritage research are plotted. The results show that the attention to third-line heritage research in China is increasing day by day, and the overall volume of publications shows a rapid growth trend;The authors’ clusters are scattered and do not form a broad and close network of cooperation;The research hotspots focus on the protection and reuse of third-line heritage, and the quantitative research methods are insufficient. In the future, the breadth and depth of third-line heritage research need to be expanded.展开更多
1 Introduction Salt lakes in China distributes in the east part of the salt lake belt of Northern Hemisphere,and they originated under complex morphological and geological background.The QT Plateau and its northern ar...1 Introduction Salt lakes in China distributes in the east part of the salt lake belt of Northern Hemisphere,and they originated under complex morphological and geological background.The QT Plateau and its northern areas belong to active tectonic zone and stable tectonic zone respectively.With elevation varies from more than 5000 m to the lowest of-展开更多
The concept,research content and direction of biological manufacturing were elaborated in this text. The biological manufacturing progress in China,application situation,development trend and existing problems were an...The concept,research content and direction of biological manufacturing were elaborated in this text. The biological manufacturing progress in China,application situation,development trend and existing problems were analyzed,and the prospect of the development of biological manufacturing was put forward,in order to provide reference and guidance for the manufacture of biological research and industrial development.展开更多
In order to visually and comprehensively grasp scientific research progress of the county-wide finance in China,and explore new breakthrough point of county-wide finance studies,this paper took China National Knowledg...In order to visually and comprehensively grasp scientific research progress of the county-wide finance in China,and explore new breakthrough point of county-wide finance studies,this paper took China National Knowledge Infrastructure( CNKI) database as research platform and made a bibliometrical study of literature indexed in CNKI between 1991 and 2013 by advanced search method. Results indicate that relevant researches take on the trend of firstly increasing then decreasing and finally steady; research hot spots mainly focus on county-wide finance and county-wide economy,county-wide inclusive finance,and county-wide finance exclusion. Based on literature review,it found subject research of county-wide finance and county-wide economic issue has become a relatively mature issue. The extension research of countywide finance exclusion and inclusive finance is devoted to remove finance exclusion. This research is a blind spot in this field and may become a breakthrough point of stimulating re-growth of county-wide finance researches.展开更多
选取国外三大休闲权威期刊《Journal of Leisure Research》(1992—2014年)、《Leisure Sciences》(1998—2014年)、《Journal of Park and Recreation Administration》(2001—2014年)共130篇休闲制约研究论文,通过文献统计和文献分析...选取国外三大休闲权威期刊《Journal of Leisure Research》(1992—2014年)、《Leisure Sciences》(1998—2014年)、《Journal of Park and Recreation Administration》(2001—2014年)共130篇休闲制约研究论文,通过文献统计和文献分析法,从研究方法、研究内容及发展趋势三方面,分析国外休闲制约研究的基本特征。研究认为:国外休闲制约研究方法以定量研究方法为主,定性研究方法日益受到重视;国外学者重点关注休闲制约因素、休闲制约协商、女性休闲制约、种族人群休闲制约和青少年休闲制约等内容,同时强调内在机制研究和模型构建。此外,关注社会文化制约因素,加强跨学科研究和时间纵向研究,重视中国文化背景下的休闲制约研究对世界休闲制约研究的独特贡献以及跨文化合作的必要性是未来研究的重要方向。展开更多
As natural ecosystems provide the material basis and fundamental support for regional sustainable devel-opment,the sustainability of natural ecosystems is an important prerequisite and a viable approach for the achiev...As natural ecosystems provide the material basis and fundamental support for regional sustainable devel-opment,the sustainability of natural ecosystems is an important prerequisite and a viable approach for the achievement of regional sustainable development.It is also the final criteria to assess whether sustainable development paradigm is successful.Along with the increasing impacts of human activities on natural ecosystems,the evaluation of regional ecological sustainability has become one of the key issues for research on macro ecology and sustainable development.Based on different unit of indicators,this study firstly groups the evaluation frameworks of regional ecological sus-tainability into three major types:comprehensive index evaluation with dimensionless unit,monetary valuation,and biophysical quantity measurement.We then discuss and compare these types in terms of basic principles,scope of ap-plications,advantages and shortcomings.Finally,drawn on the discussion about characteristics of ecological sustain-ability,we outline the current trend and future directions of regional ecological sustainability evaluation,for instance,transition from sustainable development evaluation to sustainability science,integration of goal-oriented and problem-solving approaches,combination of spatial pattern analysis and ecological sustainability evaluation,and en-hancement of ecological sustainability evaluation at landscape scale.展开更多
The stripped fruit fly, Bactrocera (Zeugodacus) scutellata (Hendel), is one of the most dangerous quarantine insect pests in China. Due to its wide distribution and heavy damage, it has caused serious economic los...The stripped fruit fly, Bactrocera (Zeugodacus) scutellata (Hendel), is one of the most dangerous quarantine insect pests in China. Due to its wide distribution and heavy damage, it has caused serious economic losses in fruit and vegetable production in China. This paper assembles research progresses in mor- phological characteristics, classification status, host ranges, geographical distribution, population dynamics, molecular ecology and biology of B. scutellata, and put forward the following research prospects as well.展开更多
Background:Aortic root dilatation occurs in adults with tetralogy of Fallot(TOF)after surgical repair,but the longitudinal changes are unclear.The main research aim is to determine the annual dilatation rate of aorta ...Background:Aortic root dilatation occurs in adults with tetralogy of Fallot(TOF)after surgical repair,but the longitudinal changes are unclear.The main research aim is to determine the annual dilatation rate of aorta in adults with repaired TOF.Methods:The present,multicentric,prospective cohort study assessed the rate of aortic diameter change in adults aged 20 years or older with TOF,including pulmonary artery atresia,who underwent surgical repair.Clinical data,focusing on echocardiograms,were collected at three-year intervals from seven hos-pitals.Results:In total,104 patients(58 males;median age:29 years)were enrolled.The actual Valsalva sinus(VS)diameter was 34.3±5.8(mean±standard deviation)and 36.1±6.0 mm at the initial andfinal examinations,respectively,and the annual dilatation rate was 0.64(0.07,1.33)(median,interquartile)mm/year.The corrected diameter at the respective examination was 21.3±3.8 and 22.2±3.7 mm/m^(2),and the annual dilation rate was 0.28(-0.21,0.76)mm/m^(2)/year.Multiple regression analysis showed that factors significant associated with dila-tation rate of actual VS diameter were the diastolic blood pressure(standardized coefficient-0.22;p=0.04),cardiothoracic ratio(0.28;0.02),and the ratio of early mitral valve inflow velocity to early diastolic annular velocity(E/e′)ratio(0.31;0.004).Factors significantly associated with corrected VS diameter were diastolic blood pressure(-0.25;0.02)and the E/e′ratio(0.34;0.001).Conclusions:In adults with repaired TOF,the rate of dilatation of the aortic diameter was associated with decreased diastolic blood pressure and left ventricular diastolic dysfunction,possibly reflecting decreased aortic wall elasticity.展开更多
This paper reviews briefly advances in recent research on monsoon by Chinese scholars, including primarily: (1) the establishment of various monsoon indices. In particular, the standardized dynamic seasonal variabi...This paper reviews briefly advances in recent research on monsoon by Chinese scholars, including primarily: (1) the establishment of various monsoon indices. In particular, the standardized dynamic seasonal variability index of the monsoon can delimit the geographical distribution of global monsoon systems and determine quantitatively the date of abrupt change in circulation. (2) The provision of three driving forces for the generation of monsoon. (3) The revelation of the heating-pump action of the Tibetan Plateau, which strengthens southerlies in the southern and southeastern periphery of the Plateau and results in a strong rainfall center from the northern Bay of Bengal (BOB) to the Plateau itself. (4) Clarification of the initial onset of the Asian Summer Monsoon (ASM) in the BOB east of 90°E, Indochina Peninsula (ICP) and the South China Sea, of which the rapid northward progression of tropical convection in the Sumatra and the rapid westward movement of the South Asia High to the Indochina Peninsula are the earliest signs. (5) The provision of an integrated mechanism for the onset of the East Asian Summer Monsoon (EASM), which emphasizes the integrated impact of sensible heat over Indian Peninsula, the warm advection of the Tibetan Plateau and the sensible heat and latent heat over the Indochina Peninsula on the one hand, and the seasonal phase-lock effect of the northward propagation of low frequency oscillation on the other. (6) The revelation of the "planetary-scale moisture transport large-value band" from the Southern Hemisphere through to the Asian monsoon region and into the North Pacific, which is converged by several large-scale moisture transport belts in the Asian-Australian monsoon regions and whose variation influences directly the temporal and spatial distribution of summer rainfall in China. (7) Presenting the features of the seasonal advance of the EASM, the propagation of intraseasonal oscillation, and their relationship with rainfall in China; indicating that the intraseasonal oscillation of the EASM propagates in the form of a wave-train along the coast and behaves as monsoon surge propagating northward. (8) Describing the interannual and interdecadal variation of Asian monsoon, revealing the factors affecting it, and possible mechanisms of the variation of Asian monsoon. An elementary outlook on the existing problems and future direction of monsoon research is also provided.展开更多
乡村振兴是国家实现共同富裕目标的重要一环,乡村旅游是推动乡村振兴的重要手段之一.文章借助CiteSpace可视化软件,选取CNKI中国知网1 118篇中文文献和Web of Science(WOS)核心数据库1 803篇英文文献作为数据样本,对近30年来国内外乡村...乡村振兴是国家实现共同富裕目标的重要一环,乡村旅游是推动乡村振兴的重要手段之一.文章借助CiteSpace可视化软件,选取CNKI中国知网1 118篇中文文献和Web of Science(WOS)核心数据库1 803篇英文文献作为数据样本,对近30年来国内外乡村旅游高质量文献进行梳理和总结,分析和对比国内外乡村旅游研究的进程和热点,并对乡村旅游未来的研究趋势进行展望.结果表明:1)国内对乡村旅游的研究呈现三个阶段的特点;2)国内研究热点聚焦于乡村旅游的社区参与、产业融合和产业升级等方面;国外研究热点关注于乡村旅游目的地形象、可持续乡村旅游以及大数据在乡村旅游中的应用等方面;3)未来乡村旅游研究可从利益分配问题、多学科的拓展研究、经验本土化、数字化、乡村振兴政策结合、人与自然的协调等六个方面展开进一步的研究.展开更多
为探索教育评价研究的新技术和新方法,把握智能时代教育评价的新规律,该文以Web of Sicence数据库中相关文献为样本,基于高影响力作者、高频关键词和突现关键词等指标揭示人工智能赋能教育评价的国际研究概况、热点与前沿;并在系统把握...为探索教育评价研究的新技术和新方法,把握智能时代教育评价的新规律,该文以Web of Sicence数据库中相关文献为样本,基于高影响力作者、高频关键词和突现关键词等指标揭示人工智能赋能教育评价的国际研究概况、热点与前沿;并在系统把握研究态势的基础上,结合中国教育评价改革的现实需求,提出该主题的研究启示。研究发现,国际人工智能赋能教育评价的研究成果主要受益于教育学、心理学、社会学和计算机科学的交叉融合;研究热点主要聚焦于机器学习支持下的结果评价、基于教育数据挖掘和学习分析的过程评价、大数据和智能导师系统支持下的增值评价和人机评分一致性四个方面;研究前沿主要关注机器学习和自然语言处理技术支持下的教育文本挖掘与评价。未来,对人工智能赋能教育评价的研究应立足研究现状与现实需求,多角度推进教育评价的转型升级;基于跨学科意识与思维,推动研究范式和思路的转变;构建智能教育评价体系,促进理论研究、技术应用和制度建设的同向同行。展开更多
文摘Since industrial revolution, the atmospheric CO2 concentration has kept a continuous increase by more than 2.2 ppm yr^-1, and approaches to almost 400 ppm at present (Jouzel 2012). China has become the largest country of greenhouse gas emission (GHG), and confronts with great challenge to mitigate GHG.
基金Supported by Project of China’s Tourism Industry Innovation Team for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality of China (Grant No.:306002)Project of "Theory to Practice of Sustainable Development-Energy Saving and Emission Reduction of Tourism Industry" Initiated by Beijing International Studies University in 2011
文摘The ecosystem services are material base and natural capital for sustainable development of human being. Valuation of ecosystem services is favorable for people realizing the importance of natural ecosystem to human being, and considering its long-term influence on sustainable development of human society when making decisions. Besides, it is an attempt of ecology, geography and other natural sciences to influence social decision process by economic methods. The Value of the World's Ecosystem Services and Natural Capital, written by Robert Costanza et al., in 1997, is generally regarded as a masterpiece for the research of valuing ecosystem services. However, the classifying standard of ecosystem services, the method of various services summation and the purpose for static global value, had confronted many criticisms. Still to now, accurately valuing ecosystem services is not easy, because of the complexity of natural ecosystem, the weak capability of economic system to pricing ecosystem services and the lack of more study in this field. Based on the criticisms summarizing and comprehensive analysis, further study suggestions of ecosystem services valuation is presented: multi-scale integrated and community participation applied in evaluation, dynamic changes of material value and intangible value of ecosystem services, investigation and simulation studies of the marginal value when ecosystem services changed, associated with related areas like ecological compensation research, and research on the market-oriented evaluation of ecosystem's intangible values.
文摘In recent years, a large number of geotechnical engineering projectshave been completed or under construction in China, such asthe Three Gorges Dam Project, Expressway Network Plan, South-to-North Water Diversion Project, West-to-East Gas Pipeline Project,etc. (Wang, 2003; Li, 2010; Huang, 2011; She and Lin, 2014). Theconstruction of large-scale geotechnical engineering not onlybrings huge economic benefits, but also causes large interferenceto the lithosphere and hydrosphere that we rely on for survival(Wang et al., 2005). This paper focuses on the interaction mechanismof rock engineering and geo-environments in the fields of urbanunderground space utilization, natural gas hydrate exploitationand high-level radioactive waste disposal.
基金supported by the funded by the National Key Programme of Research and 422 Development,Ministry of Science and Technology(2016YFC0503200)
文摘Background: Galliformes are widely distributed throughout the world and economically important to humans as domesticated animals or gamebirds. They are at a unique position for advancing knowledge and techniques of wildlife conservation as the barometer of the status of applied ecology. Populations of many galliform species have declined mainly due to habitat loss and over-hunting. An assessment of knowledge of Galliformes could help to provide guidelines for future research and conservation strategies.Methods: Using the Web of Science search engine, we conducted a literature review of galliform-related articles published from 1990 to 2016. We used the "research area" option to filter articles focused on the zoology, environmental sciences ecology, biodiversity conservation, forestry, behavioral sciences, reproductive biology, biochemistry and molecular biology, cell biology, genetics and heredity, evolutionary biology, physiology and developmental biology. We then checked duplication based on the title, abstract and full text. In addition, we examined the reference lists of selected studies to include the publications that were missed by above searching.Results: We retained 1874 articles related to the Galliformes from the initial 243,128 publications that were found. About 91.4% focused on one or two species, and 85.0% were conducted within a short duration, typically 1–2 years. The majority of the articles concentrated on macroscopic ecology(55.5%), mainly focusing on habitat selection or habitat use. With recent advances of molecular biology, the studies of taxonomy and phylogenetics rose quickly in last two decades. The study of physiology and biochemistry was no longer limited to simple description but expanded to the mechanisms of phenotype and micro-evolutionary potential. An additional area receiving increasing attention is the conservation of Galliformes, with the assessment of the conservation status and conservation management effectiveness of Galliformes(e.g. species diversity and genetic diversity) becoming the focus.Conclusions: The studies on Galliformes have made great achievements since 1990, but there are still gaps, particularly in macroscopic ecology, molecular genetics, and conservation. There is an urgent need to enhance long-term monitoring and analysis of population dynamics, and applying different disciplines to galliform conservation. Moreover, life history information of many galliform species is still lacking, which has hindered conservation efforts and effectiveness. In addition, multidiscipline studies and new technologies are not common for galliform studies, and should be encouraged.
文摘In this paper, the backdrop and significance of the research of germ-remaining rice whitener firstly were expatiated. Then, the study progress in China and overseas was summarized. Lastly, the research prospect of this kind of whitener in China was analyzed. It is hoped that it can coach the design of germ-remaining rice whitener.
文摘Data announced by the Chinese Ministry of Land and Resources in 2015 suggest that China has discovered more than 480 manganese ore-producing areas, with manganese ore resource reserves up to 1.22 billion tons, including 0.303 billion tons of basic reserves and 0.915 billion tons amount of resource. Among these reserves, manganese carbonate ores account for 56%, manganese oxide ores (including spongy manganese ores) accounts for 25%, and other types of manganese ore occupy 19%. Rich ores with 〉30% manganese content only account for 5% of the total resource amount, and the remaining 95% are poor manganese ores. Since 1983 when China first began to import, the imported manganese ores have increased annually by 25%. In 2001, the annual imported manganese ores reached 1.71 million tons. From 2010, the annual imported manganese ores increased by greater than 45%, reaching up to 12 million tons in 2015. Thus it seemed that the shortage of manganese ore resources will be a longterm phenomenon for China's economic development.
文摘The Central Iron and Steel Research Institute(CISRI),directly under the Ministry of Metallurgical Industry(MMI),is a comprehensive research institute mainly engaged in the research and development of new metallic materials and new iron and steel process.With the rapid development of China’s iron and steel industry,CISRI has also made a great progress since it was established more than 40 years ago.In 1994,the steel output of
文摘From the perspective of bibliometric analysis, based on the data of 286 related literature retrieved and screened in the CNKI database, coOC software is used for data processing, and the relevant knowledge graphs such as the amount of publication, authors, and keywords in the field of third-line heritage research are plotted. The results show that the attention to third-line heritage research in China is increasing day by day, and the overall volume of publications shows a rapid growth trend;The authors’ clusters are scattered and do not form a broad and close network of cooperation;The research hotspots focus on the protection and reuse of third-line heritage, and the quantitative research methods are insufficient. In the future, the breadth and depth of third-line heritage research need to be expanded.
文摘1 Introduction Salt lakes in China distributes in the east part of the salt lake belt of Northern Hemisphere,and they originated under complex morphological and geological background.The QT Plateau and its northern areas belong to active tectonic zone and stable tectonic zone respectively.With elevation varies from more than 5000 m to the lowest of-
基金Supported by Shaanxi Agricultural Promotion Program(2012SNJC159NTF-H1)
文摘The concept,research content and direction of biological manufacturing were elaborated in this text. The biological manufacturing progress in China,application situation,development trend and existing problems were analyzed,and the prospect of the development of biological manufacturing was put forward,in order to provide reference and guidance for the manufacture of biological research and industrial development.
基金Supported by Social Science Foundation of Hubei Province(2011LJ023)Project of National Natural Science Foundation(71173086)
文摘In order to visually and comprehensively grasp scientific research progress of the county-wide finance in China,and explore new breakthrough point of county-wide finance studies,this paper took China National Knowledge Infrastructure( CNKI) database as research platform and made a bibliometrical study of literature indexed in CNKI between 1991 and 2013 by advanced search method. Results indicate that relevant researches take on the trend of firstly increasing then decreasing and finally steady; research hot spots mainly focus on county-wide finance and county-wide economy,county-wide inclusive finance,and county-wide finance exclusion. Based on literature review,it found subject research of county-wide finance and county-wide economic issue has become a relatively mature issue. The extension research of countywide finance exclusion and inclusive finance is devoted to remove finance exclusion. This research is a blind spot in this field and may become a breakthrough point of stimulating re-growth of county-wide finance researches.
文摘选取国外三大休闲权威期刊《Journal of Leisure Research》(1992—2014年)、《Leisure Sciences》(1998—2014年)、《Journal of Park and Recreation Administration》(2001—2014年)共130篇休闲制约研究论文,通过文献统计和文献分析法,从研究方法、研究内容及发展趋势三方面,分析国外休闲制约研究的基本特征。研究认为:国外休闲制约研究方法以定量研究方法为主,定性研究方法日益受到重视;国外学者重点关注休闲制约因素、休闲制约协商、女性休闲制约、种族人群休闲制约和青少年休闲制约等内容,同时强调内在机制研究和模型构建。此外,关注社会文化制约因素,加强跨学科研究和时间纵向研究,重视中国文化背景下的休闲制约研究对世界休闲制约研究的独特贡献以及跨文化合作的必要性是未来研究的重要方向。
基金Under the auspices of National Natural Science Foundation of China (No.40635028,40801066)State Key Laboratory of Earth Surface Processes and Resource Ecology of China (No.2008-KF-04)
文摘As natural ecosystems provide the material basis and fundamental support for regional sustainable devel-opment,the sustainability of natural ecosystems is an important prerequisite and a viable approach for the achievement of regional sustainable development.It is also the final criteria to assess whether sustainable development paradigm is successful.Along with the increasing impacts of human activities on natural ecosystems,the evaluation of regional ecological sustainability has become one of the key issues for research on macro ecology and sustainable development.Based on different unit of indicators,this study firstly groups the evaluation frameworks of regional ecological sus-tainability into three major types:comprehensive index evaluation with dimensionless unit,monetary valuation,and biophysical quantity measurement.We then discuss and compare these types in terms of basic principles,scope of ap-plications,advantages and shortcomings.Finally,drawn on the discussion about characteristics of ecological sustain-ability,we outline the current trend and future directions of regional ecological sustainability evaluation,for instance,transition from sustainable development evaluation to sustainability science,integration of goal-oriented and problem-solving approaches,combination of spatial pattern analysis and ecological sustainability evaluation,and en-hancement of ecological sustainability evaluation at landscape scale.
基金Supported by National Natural Science Foundation of China(41401065)Applied Fundamental Research Project of Yunnan Province(2015FB109)
文摘The stripped fruit fly, Bactrocera (Zeugodacus) scutellata (Hendel), is one of the most dangerous quarantine insect pests in China. Due to its wide distribution and heavy damage, it has caused serious economic losses in fruit and vegetable production in China. This paper assembles research progresses in mor- phological characteristics, classification status, host ranges, geographical distribution, population dynamics, molecular ecology and biology of B. scutellata, and put forward the following research prospects as well.
基金supported by grants from the Clinical Research Fund of Tokyo Metropolitan Government Hospitals.
文摘Background:Aortic root dilatation occurs in adults with tetralogy of Fallot(TOF)after surgical repair,but the longitudinal changes are unclear.The main research aim is to determine the annual dilatation rate of aorta in adults with repaired TOF.Methods:The present,multicentric,prospective cohort study assessed the rate of aortic diameter change in adults aged 20 years or older with TOF,including pulmonary artery atresia,who underwent surgical repair.Clinical data,focusing on echocardiograms,were collected at three-year intervals from seven hos-pitals.Results:In total,104 patients(58 males;median age:29 years)were enrolled.The actual Valsalva sinus(VS)diameter was 34.3±5.8(mean±standard deviation)and 36.1±6.0 mm at the initial andfinal examinations,respectively,and the annual dilatation rate was 0.64(0.07,1.33)(median,interquartile)mm/year.The corrected diameter at the respective examination was 21.3±3.8 and 22.2±3.7 mm/m^(2),and the annual dilation rate was 0.28(-0.21,0.76)mm/m^(2)/year.Multiple regression analysis showed that factors significant associated with dila-tation rate of actual VS diameter were the diastolic blood pressure(standardized coefficient-0.22;p=0.04),cardiothoracic ratio(0.28;0.02),and the ratio of early mitral valve inflow velocity to early diastolic annular velocity(E/e′)ratio(0.31;0.004).Factors significantly associated with corrected VS diameter were diastolic blood pressure(-0.25;0.02)and the E/e′ratio(0.34;0.001).Conclusions:In adults with repaired TOF,the rate of dilatation of the aortic diameter was associated with decreased diastolic blood pressure and left ventricular diastolic dysfunction,possibly reflecting decreased aortic wall elasticity.
基金This work was jointly supported by the National Natural Science Foundation of China (Grant Nos. 40633018 40675056)the key project A of the State Ministry of Science and Technology of China "South China Sea Monsoon Experiment (SCSMEX)".
文摘This paper reviews briefly advances in recent research on monsoon by Chinese scholars, including primarily: (1) the establishment of various monsoon indices. In particular, the standardized dynamic seasonal variability index of the monsoon can delimit the geographical distribution of global monsoon systems and determine quantitatively the date of abrupt change in circulation. (2) The provision of three driving forces for the generation of monsoon. (3) The revelation of the heating-pump action of the Tibetan Plateau, which strengthens southerlies in the southern and southeastern periphery of the Plateau and results in a strong rainfall center from the northern Bay of Bengal (BOB) to the Plateau itself. (4) Clarification of the initial onset of the Asian Summer Monsoon (ASM) in the BOB east of 90°E, Indochina Peninsula (ICP) and the South China Sea, of which the rapid northward progression of tropical convection in the Sumatra and the rapid westward movement of the South Asia High to the Indochina Peninsula are the earliest signs. (5) The provision of an integrated mechanism for the onset of the East Asian Summer Monsoon (EASM), which emphasizes the integrated impact of sensible heat over Indian Peninsula, the warm advection of the Tibetan Plateau and the sensible heat and latent heat over the Indochina Peninsula on the one hand, and the seasonal phase-lock effect of the northward propagation of low frequency oscillation on the other. (6) The revelation of the "planetary-scale moisture transport large-value band" from the Southern Hemisphere through to the Asian monsoon region and into the North Pacific, which is converged by several large-scale moisture transport belts in the Asian-Australian monsoon regions and whose variation influences directly the temporal and spatial distribution of summer rainfall in China. (7) Presenting the features of the seasonal advance of the EASM, the propagation of intraseasonal oscillation, and their relationship with rainfall in China; indicating that the intraseasonal oscillation of the EASM propagates in the form of a wave-train along the coast and behaves as monsoon surge propagating northward. (8) Describing the interannual and interdecadal variation of Asian monsoon, revealing the factors affecting it, and possible mechanisms of the variation of Asian monsoon. An elementary outlook on the existing problems and future direction of monsoon research is also provided.
文摘乡村振兴是国家实现共同富裕目标的重要一环,乡村旅游是推动乡村振兴的重要手段之一.文章借助CiteSpace可视化软件,选取CNKI中国知网1 118篇中文文献和Web of Science(WOS)核心数据库1 803篇英文文献作为数据样本,对近30年来国内外乡村旅游高质量文献进行梳理和总结,分析和对比国内外乡村旅游研究的进程和热点,并对乡村旅游未来的研究趋势进行展望.结果表明:1)国内对乡村旅游的研究呈现三个阶段的特点;2)国内研究热点聚焦于乡村旅游的社区参与、产业融合和产业升级等方面;国外研究热点关注于乡村旅游目的地形象、可持续乡村旅游以及大数据在乡村旅游中的应用等方面;3)未来乡村旅游研究可从利益分配问题、多学科的拓展研究、经验本土化、数字化、乡村振兴政策结合、人与自然的协调等六个方面展开进一步的研究.
文摘为探索教育评价研究的新技术和新方法,把握智能时代教育评价的新规律,该文以Web of Sicence数据库中相关文献为样本,基于高影响力作者、高频关键词和突现关键词等指标揭示人工智能赋能教育评价的国际研究概况、热点与前沿;并在系统把握研究态势的基础上,结合中国教育评价改革的现实需求,提出该主题的研究启示。研究发现,国际人工智能赋能教育评价的研究成果主要受益于教育学、心理学、社会学和计算机科学的交叉融合;研究热点主要聚焦于机器学习支持下的结果评价、基于教育数据挖掘和学习分析的过程评价、大数据和智能导师系统支持下的增值评价和人机评分一致性四个方面;研究前沿主要关注机器学习和自然语言处理技术支持下的教育文本挖掘与评价。未来,对人工智能赋能教育评价的研究应立足研究现状与现实需求,多角度推进教育评价的转型升级;基于跨学科意识与思维,推动研究范式和思路的转变;构建智能教育评价体系,促进理论研究、技术应用和制度建设的同向同行。