期刊文献+
共找到280,299篇文章
< 1 2 250 >
每页显示 20 50 100
Regional differences in gully network connectivity based on graph theory:a case study on the Loess Plateau,China
1
作者 CHENG Jian-hua LUO Lan-hua +2 位作者 LI Fa-yuan LIU Lu-lu CUI Ling-zhou 《Journal of Mountain Science》 SCIE CSCD 2023年第4期1035-1050,共16页
Material exchange frequently occurs in gullies,and thus the relationship between a gullynetwork structure and sediment transport potential has attracted considerable interest.However,previous researches ignored the di... Material exchange frequently occurs in gullies,and thus the relationship between a gullynetwork structure and sediment transport potential has attracted considerable interest.However,previous researches ignored the difficulty of material transport from sources to sinks,and did not quantify the connectivity of a network structure.In this study,we used a graph model structure to model gully networks of six typical sample areas in the Loess Plateau of China and quantified gully network connectivity using four indexes:average node strength,accessibility from sources to sinks,potential flow,and network structural connectivity index.Results show that:(1)Reflected by different quantitative indexes,the trends of gully network connectivity in different regions are similar.From north to south,the connectivity of a sample area first increases and then decreases.(2)The more mature gullies have stronger network connectivity.Small resistance is conducive to material transport in the gullies.(3)The node connectivity index of the gully network shows a significant aggregation distribution in space,and node connectivity on the main channel is often stronger than that on the branch trench.These results not only deepen the understanding of the process and mechanism of loess gully geomorphic development and evolution but also provide a reference for geomorphic studies. 展开更多
关键词 Graph theory Gully network Loess Plateau CONNECTIVITY regional difference
原文传递
China’s urban green innovation:Regional differences,distribution dynamics,and convergence
2
作者 Yuting Xue Shumin Dong +1 位作者 Guixiu Ren Kai Liu 《Chinese Journal of Population,Resources and Environment》 2023年第4期239-248,共10页
Urban green innovation(UGI)is essential to environmental protection,ecological conservation,and high quality economic growth.Using green patents,our study assessed the level of UGI of 287 Chinese cities at and above t... Urban green innovation(UGI)is essential to environmental protection,ecological conservation,and high quality economic growth.Using green patents,our study assessed the level of UGI of 287 Chinese cities at and above the prefecture level.Then,using the Dagum Gini coefficient,kernel density estimation(KDE),and con‐vergence models,we examined regional differences,distribution dynamics,and convergence of UGI across China.The study’s findings are as follows:(1)Overall,regional differences in UGI tended to narrow,and the main contributor to these differences was the difference between economic zones.(2)KDE showed that the level of UGI was rising,which was polarized within each economic zone.(3)The national UGI in economic zones other than the Northeast and Middle Yellow River Economic Zones featured significantσconvergence,while each economic zone showed absolute and conditionalβconvergence. 展开更多
关键词 Urban green innovation regional difference Distribution dynamic CONVERGENCE Green patent
下载PDF
Study on Comprehensive Efficiency Evaluation of Rural Power Grid under Rural Revitalization Strategy Considering Regional Differences
3
作者 Huiru Zhao Manyu Yao +3 位作者 Zhenqi Bai Yue Zhang Zhihua Ding Zhenda Hu 《Energy Engineering》 EI 2023年第10期2211-2231,共21页
As an essential infrastructure,the rural power grid is vital in promoting agricultural and rural carbon sequestration and improving rural energy electrification.It is necessary to carry out in-depth research on its co... As an essential infrastructure,the rural power grid is vital in promoting agricultural and rural carbon sequestration and improving rural energy electrification.It is necessary to carry out in-depth research on its comprehensive efficiency.Based on the requirements of“double carbon”and rural revitalization strategy for the rural Power Grid,this paper focuses on the modernization and low-carbon transformation of the rural Power Grid.It constructs an input-output index system for the investment efficiency of the rural Power Grid in China under the new situation.It uses the primary data of the rural Power Grid of 30 prefecture-level cities in China from 2019 to 2021 to evaluate the investment efficiency of the rural Power Grid in China through a three-stage DEA model.The empirical results show that:considering the regional differences,the comprehensive efficiency of the rural Power Grid in backward areas is significantly improved;that is,the three-stage DEA method can more objectively evaluate the comprehensive efficiency of the rural Power Grid.In the context of the continued promotion of the rural revitalization strategy,to improve the comprehensive efficiency of the rural Power Grid,it is necessary to improve the technical level of the rural Power Grid further and appropriately expand the scale of investment in the rural Power Grid. 展开更多
关键词 regional difference rural revitalization rural power grid three-stage DEA efficiency of investment
下载PDF
Analysis of Regional Differences in Bone Mineral Density Acquisition Factors in Young Women
4
作者 Norie Funaki Fumihiro Omasu +5 位作者 Asami Endo Minami Mashiko Kana Okazaki Natsuki Ogata Kosuke Hiruma Tomomi Gotoh 《Journal of Biosciences and Medicines》 2023年第11期108-122,共15页
Purpose: Obtaining high peak bone mass (PBM) and maintaining bone mass is important for the prevention of osteoporosis. This study aimed to examine the regional differences in bone mineral density and factors associat... Purpose: Obtaining high peak bone mass (PBM) and maintaining bone mass is important for the prevention of osteoporosis. This study aimed to examine the regional differences in bone mineral density and factors associated with its acquisition from exercise. Design: The study population included 75 women of 18 - 22 years of age in East Japan and 104 women of 18 - 27 years of age in West Japan. The speed of sound (SOS) of the calcaneus was measured, and the young adult mean (%YAM) was calculated from the SOS. The subjects’ medical history, family history of osteoporosis, and exercise habits were examined using a self-administered questionnaire. Results: There were a significantly greater number of subjects with low %YAM in West Japan. The exercise history and exercise time were significantly higher in West Japan, and the exercise intensity score tended to be higher in East Japan during junior high and high school. A multiple regression analysis by region revealed that the following factors had a significant positive association with the SOS: exercise intensity at elementary school and outdoor sports at junior high school in East Japan;and exercise time at elementary school, muscle mass, and outdoor sports at junior high school in West Japan. On the other hand, exercise time in junior high school in West Japan showed a negative association with the SOS. Conclusions: Regional differences in bone mineral density existed, suggesting a trend toward lower bone mineral density in West Japan. Exercise history and time tended to be higher in West Japan, and exercise intensity scores tended to be higher in East Japan, suggesting that exercise intensity may be more important than exercise time for obtaining bone mineral density. 展开更多
关键词 Bone Mineral Density Exercise Intensity Region differences Young Women
下载PDF
Regional differences in global glacier retreat from 1980 to 2015 被引量:5
5
作者 LI Yao-Jun DING Yong-Jian +1 位作者 SHANGGUAN Dong-Hui WANG Rong-Jun 《Advances in Climate Change Research》 SCIE CSCD 2019年第4期203-213,共11页
Global warming triggers shrinking and thinning of glaciers worldwide,with potentially severe implications for human society.However,regional differences in glacier retreat and its relationship with climatic characteri... Global warming triggers shrinking and thinning of glaciers worldwide,with potentially severe implications for human society.However,regional differences in glacier retreat and its relationship with climatic characteristics have not been conclusively demonstrated.In this study,regional changes in global glaciers based on two primary features,area change and mass balance,were investigated on the basis of data collected from published research on glacier changes.Results show that during the period 1980—2015,the rate of global glacier area shrinkage was 0.18%per year and that of global glacier mass loss was 0.25 m w.e.per year.Retreat of glaciers located at low and middle latitudes was characterized by severe area shrinkage and mass loss.Correspondingly,in the Arctic,deglaciation was characterized by ice thinning due to a low area reduction but relatively high mass loss rate.However,glaciers in high southern latitudes were in a relatively stable status.High Mountain Asia exhibited the lowest rate of area shrinkage and mass loss among glaciers located at low and middle latitudes,and a slower rate of mass loss compared with the global average.Glaciers in the Tropical Andes exhibited the fastest rate of glacier area shrinkage(—1.6%per year),whereas Antarctic and Subantarctic glaciers showed the lowest rate(—0.11%per year).For mass balance,the most negative occurred at Southern Andes(—0.81 m w.e.per year),followed by Alaska(-0.74 m w.e.per year).Only the Antarctic and Subantarctic experienced small mass gain(0.04 m w.e.per year).High levels of correlation are found between the rates of glacier retreat and annual average temperature and annual total precipitation instead of their trends.The variability of the surface climate conditions in the glacier environment plays a key role in driving these regional differences in global glacier retreat. 展开更多
关键词 Glacier retreat regional differences Climate change
下载PDF
Analysis on Chinese Regional Differences in International Tourism Foreign Exchange Earnings with Method of One-way Variance Analysis 被引量:1
6
作者 Zhang Liuchen 《新丝路(下旬)》 2016年第20期58-61,共4页
Based on data over 31 provinces and cities in China from2006 to 2013,this thesis first divides those 31 provinces and cities into four economic regions including northeastern region,central region,eastern region and w... Based on data over 31 provinces and cities in China from2006 to 2013,this thesis first divides those 31 provinces and cities into four economic regions including northeastern region,central region,eastern region and western region.Based on data over 31 provinces and cities in China from 2006 to 2013,those 31 provinces and cities were devided into four economic regions in this thesis,including northeastern region,central region,eastern region and western region.Then,it takes international tourism foreign exchange earnings as the dependent variable,the four economic regions as the factor to measure the difference of international tourism foreign exchange earnings in different regions,and finds out the main reasons of it.Through the one-way variance analysis on international tourism foreign exchange earnings,we can know that international tourism foreign exchange earnings have differences in different regions apparently.Besides,significant differences can be found between northeastern and central regions as well as eastern and western regions,while it is not the same case between the central and western regions. 展开更多
关键词 international tourism foreign exchange earnings one-way variance analysis regional differences
下载PDF
Gini Index for Cities: A Preliminary Study on Regional Differences of Chinese City Size Distribution
7
作者 Liu Wangbao & Zheng Bohong Department of Architecture and Urban Planing, Central South University, Changsha 410075, Hunan 《Chinese Journal of Population,Resources and Environment》 2004年第4期33-36,共4页
City size distribution is of interest because of a number of key stylized facts, including notably Zipf's law for cities and the importance of urban primacy. But a new and more efficient method Gini index can be u... City size distribution is of interest because of a number of key stylized facts, including notably Zipf's law for cities and the importance of urban primacy. But a new and more efficient method Gini index can be used for calculating regional city size distribution. This paper begins by developing a calculation method for the Gini index, dividing the whole country into 26 areas and then calculating each area's Gini index value. Based on these calculation results, this paper gives a preliminary study on regional differences of its city size distribution and the dynamics. 展开更多
关键词 Gini index city size distribution regional differences
下载PDF
Assessment of Electricity Productivity in China:Regional Differences and Convergence
8
作者 Pinjie Xie Ying Zhai +2 位作者 Fan Yang Zhuowen Mu Chao Wang 《Energy Engineering》 EI 2021年第5期1353-1374,共22页
Electricity productivity is regarded as a major assessment indicator in the design of energy saving policies,given that China has entered a“New Normal”of economic development.In fact,enhancing electricity productivi... Electricity productivity is regarded as a major assessment indicator in the design of energy saving policies,given that China has entered a“New Normal”of economic development.In fact,enhancing electricity productivity in an all-round way,as is one of the binding indicators for energy and environmental issues,means that non-growth target of total electric energy consumption in the economic development is feasible.The Gini coefficient,Theil index,and Mean log deviation are utilized to measure regional differences in China’s electricity productivity from 1997 to 2016 in five regions,and conditionalβconvergence is empirically analyzed with the spatial Durbin model.The results show that:(1)China’s electricity productivity is improving,while the overall feature is that the eastern area has a higher efficiency than the western area.(2)The difference in electricity productivity is the smallest in the northeast and the largest in the northwest.Interregional difference plays an important role and is the main cause for the differences.(3)The electricity productivity in China exhibitsβconvergence,except for the northwest.The positive driving factor is urbanization level(0.0485%),and the negative driving factor is FDI(–0.0104%).Moreover,the urbanization rate(0.0669%),foreign direct investment(0.0960%),and the industrial structure(–0.0769%)have a spatial spillover effect on improving regional electricity productivity.Based on this conclusion,the study provides some recommendations for saving energy policy design in China’s power industry. 展开更多
关键词 Electricity productivity regional differences CONVERGENCE spatial Durbin model
下载PDF
A Study on Interregional Differences in Elderly Person’s Remote Care in Terms of Traveling Time and Expense:Comparative Consideration in TOKYO Area and OSAKA Area
9
作者 Yuichi Sueshige Hideaki Takayanagi Tatsuto Kihara 《Journal of Civil Engineering and Architecture》 2020年第8期433-451,共19页
This study has been carried out to examine the development of an “elderly tele-nursing model” for care provided in-homeby family members and through remote nursing systems in a super-aging society. The time required... This study has been carried out to examine the development of an “elderly tele-nursing model” for care provided in-homeby family members and through remote nursing systems in a super-aging society. The time required for elderly tele-nursing wasinfluenced by whether or not the visitor uses the Shinkansen or the Express train. Based on 40 questionnaires, clear differences wereobserved according to whether visits were “every two weeks” or “once per month”. And finally, comparing the trends andcharacteristics of remote care for the elderly in the TMA (Tokyo Main Area) and Kansai region clarified regional characteristic. 展开更多
关键词 Super-aging society travel time and cost remote elderly care family caregiving interregional differences
下载PDF
Regional Differences of China′s Urban Expansion from Late 20th to Early 21st Century Based on Remote Sensing Information 被引量:35
10
作者 LIU Jiyuan ZHANG Qian HU Yunfeng 《Chinese Geographical Science》 SCIE CSCD 2012年第1期1-14,共14页
This study investigated the regional differences of China′s urban land expansion from the late 1980s to the year of 2008, based on the spatio-temporal analysis of CLCD (China′s land cover/land use database) datasets... This study investigated the regional differences of China′s urban land expansion from the late 1980s to the year of 2008, based on the spatio-temporal analysis of CLCD (China′s land cover/land use database) datasets which were mainly produced from remote sensing imagery data. A newly defined urbanization level index (UI), based on urban land area, is proposed to describe Chinese urban expansion process at 1 kilometer, provincial, regional, and na-tional scales, together with the absolute urban expansion index (UEa) and the relative urbanization expansion index (UEr). The results indicate that the percentages of total land area occupied by urban in the late 1980s, 1995, 2000, 2005, and 2008 were approximately 0.25%, 0.32%, 0.33%, 0.43% and 0.52% of China′s total land area, respectively. Between the late 1980s and 2008, the total urban expansion in the mainland of China was 2.645 × 104 km2, resulting in an annual urban expansion area of about 1322.7 km2/yr, with the UEr of 111.9%. This study also finds that there has been an obvious spatial gradient of urbanization ratio running from the east coast to the west inland, and the urbanization gaps among different regions have persisted over the past two decades. The study also reveals obvious temporal varia-tions of the urbanization rates. There was very little urban growth during the period of 1995-2000 due to the governmental policy factors. 展开更多
关键词 中国内地 城市扩展 区域差异 遥感信息 后期 城市化水平 土地利用数据库 基础
下载PDF
Regional differences of water conservation in Beijing’s forest ecosystem 被引量:10
11
作者 ZHANG Biao XIE Gao-di YAN Yu-ping YANG Yan-gang 《Journal of Forestry Research》 SCIE CAS CSCD 2011年第2期295-300,共6页
The water conservation capacities of main forests in Beijing,China were estimated through the quantitative analysis.Various methods developed in published papers on forest hydrology were employed.The forests in Huairo... The water conservation capacities of main forests in Beijing,China were estimated through the quantitative analysis.Various methods developed in published papers on forest hydrology were employed.The forests in Huairou,Yanqing,Miyun,Mentougou and Fangshan districts are the main contributors to water conservation(the cumulative ratio reaches 65%),and the forests in Tongzhou,Chaoyang,Shunyi and Daxing districts have the highest water conservation capacity(3000 m3/ha).Altitude and slope are the key factors to affect the water conservation capacity.The forests located in Plain Area,Hilly Area,Low Mountain,and Middle Mountain contributes 27%,28%,24% and 21% of the conserved water,respectively.The water conservation capacity of forests in Plain Area(2 948 m3/ha),is superior to the forests in other regions.And the forests situated on Flat Slope,Moderate Slope and Gentle Slope constitute the largest proportion(nearly 93%) of water conservation,while the forests on Flat Slope has the highest water conservation capacity(2 797 m3/ha),and the forest on Steep slope has the lowest water conservation capacity(948 m3/ha). 展开更多
关键词 森林生态系统 水源涵养能力 区域差异 北京 定量分析 森林水文 海拔高度 平原地区
下载PDF
Regional Differences in Specific Health Examination Utilization and Medical Care Expenditures in Japan 被引量:1
12
作者 Nozomu Mandai Mayumi Watanabe 《Health》 2020年第9期1143-1150,共8页
<strong>Background:</strong> Despite having one of the most successful health systems in the world, annual medical expenditures in Japan have been increasing year to year. We sought to clarify regional dif... <strong>Background:</strong> Despite having one of the most successful health systems in the world, annual medical expenditures in Japan have been increasing year to year. We sought to clarify regional differences in medical expenditures by analyzing the relationship between the specific health examination coverage and medical care expenditure by prefecture of Japan. <strong>Methods:</strong> We used data from the National Database of Health Insurance Claims and Specific Health Checkups (NDB) Open Data Japan (2015) and Overview of 2015 National Medical Expenses to compare medical care expenditure per capita and proportions of persons receiving specific health examination between Japan nationally and individual prefectures. <strong>Results: </strong>National medical expenditures were 42.3 trillion Japanese yen (JPY) (3851 hundred million dollars), with a national per capita rate of JPY347,219 (USD3156). Per capita medical expenditure rates by prefecture ranged from JPY290,900 (USD2645) in Saitama Prefecture to JPY 444,000 (USD4036) in Kochi Prefecture. The proportion of persons receiving specific health examinations was 49.0% for Japan overall and ranged from 39.3% in Hokkaido Prefecture to 63.4% in Tokyo Prefecture. We observed a significant negative correlation between per capita medical expenditures and the proportion of persons receiving specific health examinations (R = 0.553, p < 0.001).<strong> Conclusion: </strong>We found a significant negative correlation between per capita medical expenditures and the proportion of persons receiving health examinations: prefectures with lower expenditures tended to have higher rates of medical examinations. Interventions to increase the proportion of persons receiving specific health examinations by prefecture could reduce per capita medical expenditures and reduce prefectural disparities in expenditures. 展开更多
关键词 Medical Expenditures regional Disparities Health Examinations
下载PDF
Regional differences and threshold characters of the impact of energy use efficiency on energy scarcity in China
13
作者 Min Li Kaisheng Long 《Chinese Journal of Population,Resources and Environment》 2021年第3期265-273,共9页
The improvement of the technical efficiency of energy use has been widely seen as an important way to alleviate energy scarcity.However,the energy rebound effect demonstrates the vulnerability and unsustainability of ... The improvement of the technical efficiency of energy use has been widely seen as an important way to alleviate energy scarcity.However,the energy rebound effect demonstrates the vulnerability and unsustainability of alleviating energy scarcity relying on technology.Under the background of the consistent development of energy factor market,it is of great importance to explore the paths and differences of energy source allocation constrained by technology and cost to promote the sustainable use of energy.This study analyzed the regional differences and threshold characteristics in the impact of the technical and cost efficiency of energy use on energy scarcity using the instrumental variable-two-stage least square method,based on the panel data of Chinese provinces from 2003 to 2017.The results showed that:①Technology and price were the critical forces of the technical and cost efficiency of energy use.They changed the degree of use of surplus production factors by affecting the complementary and replacement demand relationship between energy and non-energy factors.Meanwhile,the impact of energy use efficiency on energy scarcity showed regional and time features due to the different technology capabilities and different levels of market development in different regions and different time.②The alleviation of energy scarcity at the national level relied on the improvement of energy cost efficiency.At the regional level,the alleviation of energy scarcity in central China came from the improvement of the technical efficiency of energy use.However,the alleviation of energy scarcity in the eastern and western regions was due to the improvement of energy cost efficiency.③Constrained by the economic development,openness,science and technology input and the industrial development structure,the impact of the technical and cost efficiency of energy use on energy scarcity demonstrated a nonlinear feature.And structural mutation occurred after passing a specific‘inflection point’,which showed a significant threshold feature.Therefore,energy price should play an important role in energy use and it is necessary to pay attention to the regional differences and time characteristics of energy economic development to promote the sustainable development of energy resources. 展开更多
关键词 Eenergy use technical efficiency Energy cost efficiency Energy scarcity regional difference Threshold regression
下载PDF
Regional Differences and Characteristics of Soil Organic Carbon Density Between Dry Land and Paddy Field in China 被引量:5
14
作者 XU Quan RUI Wen-yi BIAN Xin-min ZHANG Wei-jian 《Agricultural Sciences in China》 CAS CSCD 2007年第8期981-987,共7页
Study on the regional characteristics of soil organic carbon (SOC) density in farmland will not only contribute greatly to the technique of soil productivity enhancement, but also give evidences of technique selection... Study on the regional characteristics of soil organic carbon (SOC) density in farmland will not only contribute greatly to the technique of soil productivity enhancement, but also give evidences of technique selection and policy making for carbon sequestration in soils. Based on the second national soil survey of China, the situation of SOC density in the plow layer of farmland was analyzed under different land use patterns. Results showed that SOC density in the plow layer was about 3.15 kg m-2 in average ranging from 0.81 to 12.68 kg m-2. The highest density was found in the southeastern region with an average of 3.63 kg m-2, while the lowest occurring in the northwestern region with an average of 3.00 kg m-2. The variation coefficient of SOC density in the plow layer of farmland was 57%, which was 35% lower than that of non-farmland soils. Compared to SOC density in the dry land, SOC density in paddy soils was 13% higher with a lower variation coefficient between different regions. In addition, the relationships between the climatic factors (annual average temperature and precipitation) and SOC density were lower in farmland than those in non-farmland soils, as well as lower in paddy soils than those in dry land of farmland. These results suggest that anthropogenic disturbances have great impacts on SOC density in farmland soils, especially in paddy soils, indicating that Chinese rice cropping may contribute greatly to the SOC stability and sequestration in paddy field. 展开更多
关键词 土地利用模式 有机碳密度 碳吸收 整体变换
下载PDF
Regional Differences and Optimal Allocation of Cultivated Land Utilization Benefits Based on Improved TOPSIS Method:A Case Study of Guangxi
15
作者 Chuchu SUN Ning GENG Mengyao WANG 《Asian Agricultural Research》 2021年第7期24-31,共8页
Taking 14 prefecture-level cities in Guangxi as an object,this paper explored the difference of cultivated land utilization efficiency in Guangxi,comprehensively evaluated the economic,social,and ecological aspects,an... Taking 14 prefecture-level cities in Guangxi as an object,this paper explored the difference of cultivated land utilization efficiency in Guangxi,comprehensively evaluated the economic,social,and ecological aspects,and analyzed the regional differences in cultivated land use efficiency in Guangxi from 2005 to 2018 based on the improved TOPSIS method.By studying the quantitative change trends and spatial differences of the utilization benefit of cultivated land resources in Guangxi,it came up with recommendations for optimizing the allocation of cultivated land from the quantity and quality of cultivated land.It is intended to provide a scientific and theoretical reference for improving the use efficiency of cultivated land in Guangxi. 展开更多
关键词 Efficiency of cultivated land use Improved TOPSIS method regional difference Optimal allocation GUANGXI
下载PDF
Analysis of Regional Differences of Energy Footprint in China Based on STIRPAT Model
16
作者 LI Qi,HAN Ya-fen,CHEN Jian-yong Geography and Environmental Science Department,Suzhou College,Suzhou 234000,China 《Asian Agricultural Research》 2010年第5期58-60,共3页
On the basis of the previous researches and the ecological footprint theory,we use the cross-sectional data of Chinese energy consumption in 2007 to calculate the regional differences of energy consumption footprint o... On the basis of the previous researches and the ecological footprint theory,we use the cross-sectional data of Chinese energy consumption in 2007 to calculate the regional differences of energy consumption footprint of 30 provinces in China;by using the method of EEF calculation method,we calculate the regional distribution of EFI and analyze its law;through the construction of STIRPAT model,we reveal the relationship between EEF and factors of population and economy.The results show that provinces with higher EEF mainly concentrate in the Middle Eastern China,which have a developed industry,such as Shandong,Hebei,Liaoning Province and so on.However,provinces with lower EEF mainly concentrate in the Western China,which have a relatively poor economy,such as Ningxia,Qinghai Province and so on.These results are in accordance with the area distribution of China's economic development level.The EFI decreases gradually from west to east.As the level of regional economy is improved,the EFI has the downward trend.The quantity of population shows notable impact on EFI.The per capita GDP does not show the nagative relationship with EFI,which can not prove the existence of Environmental Kuznets Curve. 展开更多
关键词 EEF regional differences ENVIRONMENTAL impact STIR
下载PDF
Differential Neutrophil Infiltration Contributes to Regional Differences in Brain Infiammation in the Substantia Nigra Pars Compacta and Cortex 被引量:1
17
作者 KYUNG-AE JI MI YOUNG EU +3 位作者 SEUNG-HEE KANG BYOUNG JOO GWAG ILO JOU EUN-HYE JOE 《神经损伤与功能重建》 2008年第4期265-273,共9页
脑的炎症反应是神经退行性疾病的危险因素之一。有趣的是,黑质密部(SNpc)严重的炎性反应会加速帕金森病的发作和进展。本研究通过比较SNpc与皮质的炎性过程来检测SNpc严重炎性反应的潜在机制。在完整的脑组织中,SNpc和皮质的CD11b+小胶... 脑的炎症反应是神经退行性疾病的危险因素之一。有趣的是,黑质密部(SNpc)严重的炎性反应会加速帕金森病的发作和进展。本研究通过比较SNpc与皮质的炎性过程来检测SNpc严重炎性反应的潜在机制。在完整的脑组织中,SNpc和皮质的CD11b+小胶质细胞密度是相似的。但是,脂多糖注射可增加SNpc的CD11b+细胞数目,而不能增加皮质中的。以前作者曾报道内毒素注射之后,黑质密部有CD11b和MPO双阳性的中性粒细胞浸润(GLIA55:1577-1588)。值得注意的是,MPO+中性粒细胞数量在SNpc中显著增加,而在皮质中只有轻微提高。中性粒细胞浸润的范围与神经元损伤相关。作者证实,内毒素注射后,中性粒细胞减少大鼠的SNpc中的神经元丢失较正常大鼠显著减少。此外,完整的SNpc中的星形胶质细胞密度明显低于皮质。而且,内毒素注射后,SNpc的内皮细胞和星形胶质细胞的损害以及血脑屏障的通透性均有显著变化。这些结果都提示,过度的中性粒细胞浸润和环境因子,例如低星形胶质细胞浓度和高血脑屏障通透性,会导致SNpc的重度炎症和神经元死亡。 展开更多
关键词 中性粒细胞 脑炎症 区域差异
下载PDF
REGIONAL DIFFERENCES OF ECONOMIC DEVELOPMENT OF THE CHANGJIANG RIVER VALLEY
18
作者 陈国阶 《Chinese Geographical Science》 SCIE CSCD 1994年第2期97-105,共9页
REGIONAL DIFFERENCES OF ECONOMIC DEVELOPMENT OF THE CHANGJIANG RIVER VALLEY ChenGuoJie(陈国阶)(ChengduInstitute... REGIONAL DIFFERENCES OF ECONOMIC DEVELOPMENT OF THE CHANGJIANG RIVER VALLEY ChenGuoJie(陈国阶)(ChengduInstituteofMountainDisaste... 展开更多
关键词 the Changjang RIVER VALLEY ECONOMIC development strategy LOCATION differences
下载PDF
OBSERVATION ON REGIONAL DIFFERENCES OF SOME DEHYDROGENASES AND HYDROLASES IN RAT EPIDIDYMIS
19
作者 Zhang Junhui, Wu Lijun Wu Jingmei +1 位作者 Wu Mingzhang (Shanghai Zo. 2 Medical University) 《中国组织化学与细胞化学杂志》 CAS CSCD 1992年第1期118-125,149-150,共10页
The epididymal epithelia, by secretion, fluid reabsorption and transition, provide a favorable environment for sperm maturation. We observed, with histochemical method, the regional differences of four hydrolases and ... The epididymal epithelia, by secretion, fluid reabsorption and transition, provide a favorable environment for sperm maturation. We observed, with histochemical method, the regional differences of four hydrolases and five dehydrogenases in caput, corpus and cauda of rat epididymis 展开更多
关键词 rat EPIDIDYMIS EPITHELIA in different SEGMENTS SPERMATOZOA in cavity HYDROLASES DEHYDROGENASES
下载PDF
An Empirical Study on Regional Differences of Higher Education Financial Aid in China
20
作者 ZHAN Hong-yi 《Journalism and Mass Communication》 2017年第9期516-528,共13页
关键词 高等教育 地区性 金融 实验 中国 数据检验 经济开发 学生
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部