检索结果-南通市图书馆

An equilibrium analysis of the land use structure in the Yunnan Province, China

Frontiers of Earth Science 2014年第3期8卷 393-404页

作者： Jiao LUO Jinyan ZHAN Yingzhi LIN chunhong zhao State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China School of Mathematics and Physics China University of Geosciences Wuhan 430074 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Center for Chinese Agricultural Policy Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China

Global land use structure is changing rapidly due to unceasing population growth and accelerated urbanization, which leads to fierce competition between the rigid demand for built-up area and the protection of cultivated land, forest, and grassland. It has been a great challenge to realize the sustainable development of land resources. Based on a computable general equilibrium model of land use change with a social accounting matrix dataset, this study implemented an equilibrium analysis of the land use structure in the Yunnan Province during the period of 2008-2020 under three scenarios, the baseline scenario, low TFP （total factor productivity） scenario, and high TFP scenario. The results indicated that under all three scenarios, area of cultivated land declined signifi- cantly along with a remarkable expansion of built-up area, while areas of forest, grassland, and unused land increased slightly. The growth rate of TFP had first negative and then positive effects on the expansion of built-up area and decline of cultivated land as it increased. Moreover, the simulated changes of both cultivated land and built-up area were the biggest under the low TFP scenario, and far exceeded the limit in the Overall Plan for Land Utilization in the Yunnan Province in 2020. The scenario-based simulation results are of important reference value for policy-makers in making land use decisions, balancing the fierce competition between the protection of cultivated land and the increasing demand for built-up area, and guaranteeing food security, ecological security, and the sustainable development of land resources.

关键词： land use land use structure computable general equilibrium model of land use change socialaccounting matrix scenarios Yunnan Province

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effects of acid drainage from abandoned coal mines on the microbial community of Shandi River sediment,Shanxi Province

引用

International Journal of Coal Science & Technology 2021年第4期8卷 756-766页

作者： Di Chen Qiyan Feng Wenbo Li Yuan Song chunhong zhao Collaborative Innovation Center for Resource Utilization and Ecological Restoration of Old Industrial Base China University of Mining and TechnologyXuzhou 221116China School of Environment Science and Spatial Informatics China University of Mining and TechnologyXuzhou 221116China Institute of Karst Geology of Chinese Academy of Geology Sciences Guilin 541004China

The discharge of acid mine drainage from abandoned high sulfur(S)coal mines has caused serious pollution in the Shandi River,Yangquan,Shanxi *** determine the impact of long-term acid mine drainage on the microorganisms in the river,we collected river sediments from a polluted tributary(Group P)and the mainstream of Shandi River(Group R)to study the bacterial diversity and community *** results showed that the tributary was seriously polluted by acid drainage from abandoned coal mines,with the pH value of the sediment being<2.5,resulting in the low bacterial richness and diversity of the tributary *** Fe-and S-metabolizing bacteria,such as Metallibacterium,Acidiphilium,and Acidithiobacillus,were the dominant genera in Group P samples,while the Group R was dominated by the neutral anaerobic iron-reducing bacteria Geothrix and *** of principal co-ordinates analysis(PCoA)revealed that the bacterial communities are significantly different between groups P and R,and the significant different species were mainly attributed to phylum Proteobacteria,Actinobacteria,and *** distribution of the microbial community is mainly influenced by pH,and the Fe and Cd ***,the dominant genus,is negatively correlated with pH(R^(2)=-0.95)and positively correlated with Fe(R^(2)=0.99),while Geothrix and Geobacter,are mainly affected by the heavy *** study determined the impact of river pollution caused by abandoned coal mine drainage,especially on the microbial diversity and community composition within the river sediment.

关键词： Abandoned coal mine Acid mine drainage Bacterial community River sediment PCoA

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The impacts of climate change and human activities on grassland productivity in Qinghai Province, China

引用

Frontiers of Earth Science 2014年第1期8卷 93-103页

作者： Fang YIN Xiangzheng DENG Qin JIN Yongwei YUAN chunhong zhao Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China Center for Chinese Agricultural Policy Chinese Academy of Sciences Beijing 100101 China School of Mathematics and Physics China University of Geosciences Wuhan 430074 China Faculty of Resource and Environmental Science Hubei University Wuhan 430062 China

Qinghai Province, which is the source of three major rivers （i.e., Yangtze River, Yellow River and Lancang River） in East Asia, has experienced severe grassland degradation in past decades. The aim of this work was to analyze the impacts of climate change and human activities on grassland ecosystem at different spatial and temporal scales. For this purpose, the regression and residual analysis were used based on the data from remote sensing data and meteorological stations. The results show that the effect of climate change was much greater in the areas exhibiting vigorous vegetation growth. The grassland degradation was strongly correlated with the climate factors in the study area except Haixi Prefecture. Temporal and spatial heterogeneity in the quality of grassland were also detected, which was probably mainly because of the effects of human activities. In the 1980s, human activities and grassland vegetation growth were in equilibrium, which means the influence of human activities was in balance with that of climate change. However, in the 1990s, significant grassland degradation linked to human activities was observed, primarily in the Three-River Headwaters Region. Since the 21st century, this adverse trend continued in the Qinghai Lake area and near the northern provincial boundaries, opposite to what were observed in the eastern part of study. These results are consistent with the currently status of grassland degradation in Qinghai Piovince, which could serve as a basis for the local grassland management and restoration programs.

关键词： climate change human activities grassland degradation spatial distribution residual analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Adenosine triphosphate-sensitive potassium channel opener protects PC12 cells against hypoxia-induced apoptosis through PI3K/Akt and Bcl-2 signaling pathways

引用

Neural Regeneration Research 2010年第22期5卷 1706-1711页

作者： Hong Zhang chunhong Jia Danyang zhao Yang Lu Runling Wang Jia Li Department of Neurology the Affiliated Shengjing Hospital of China Medical University Shenyang 110004 Liaoning Province China

Although previous studies have shown the neuroprotective effects of the adenosine triphosphate （ATP）-sensitive potassium （KATP） channel opener against ischemic neuronal damage, little is known about the mechanisms involved. Phosphatidylinositol-3 kinase （PI3K）/v-akt murine thy-moma viral oncogene homolog （Akt） and Bcl-2 are thought to be important factors that mediate neuroprotection. The present study investigated the effects of KATP openers on hypoxia-induced PC12 cell apoptosis, as well as mRNA and protein expression of Akt and Bcl-2. Results demon-strated that pretreatment of PC12 cells with pinacidil, a KATP opener, resulted in decreased PC12 cell apoptosis following hypoxia, as detected by Annexin-V fluorescein isothiocyanate/ propidium iodide double staining flow cytometry. In addition, mRNA and protein expression of phosphorylated Akt （p-Akt） and Bcl-2 increased, as detected by immunofluorescence, Western blot analysis, and reverse-transcription polymerase chain reaction. The protective effect of this preconditioning was attenuated by glipizide, a selective KATP blocker. These results demonstrate for the first time that the protective mechanisms of KATP openers on PC12 cell apoptosis following hypoxia could result from activation of the PI3K/Akt signaling pathway, which further activates expression of the downstream Bcl-2 gene.

关键词： ATP-sensitive potassium channel PC12 cells hypoxia apoptosis pinacidil phosphatidylinositol-3 kinase/v-akt murine thymoma viral oncogene homolog Bcl-2

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An extended input-output table for environmental and resources accounting

引用

Chinese Journal of Population,Resources and Environment 2014年第1期12卷 33-41页

作者： Feng Wu Jinyan Zhan Chenchen Shi chunhong zhao State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal University Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences College of Resources and Environment University of Chinese Academy of Sciences Center for Chinese Agricultural Policy Chinese Academy of Sciences

Environmentally Extended Input-Output(EEIO)tables have become a powerful element in supporting information-based environmental and economic ***-and provincial-level 10 tables are currently published by the National Bureau of Statistics of the People's Republic of China according to well-defined ***,county-level 10tables are not provided as a rule by official statistics *** paper conducts an overview of compiling EEIO tables for environmental and resources accounting at the county level and then answers several questions:First,what kind of data should be prepared for the compilation of county-level EEIO tables?Second,how can we set up comprehensive EEIO tables at the county level?Third,regarding the survey methods and the indirect modeling,which one should be chosen to build EEIO tables at the county level?Finally,what policy questions could such a table answer?EEIO tables at the county level can be used to predict the economic impacts of environmental policies and to perform trend and scenario analysis.

关键词： county-level input-output table accounting influence coefficients

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

个税递延型养老保险个人缴费研究——基于公平性的视角

引用

保险研究 2017年第12期 15-28页

作者：赵春红中国人民大学北京100872 中国人民保险集团北京100031

我国现行企业年金纳税递延制度和个税递延型商业养老保险即将破冰,本文从公平性视角出发,建立了一般均衡两期世代交叠模型研究个税递延型商业养老保险缴费纳税抵扣上限问题。研究结果表明,个税递延型商业养老保险个人缴费纳税抵扣上限... 详细信息

我国现行企业年金纳税递延制度和个税递延型商业养老保险即将破冰,本文从公平性视角出发,建立了一般均衡两期世代交叠模型研究个税递延型商业养老保险缴费纳税抵扣上限问题。研究结果表明,个税递延型商业养老保险个人缴费纳税抵扣上限应该是企业年金账户个人缴费和企业缴费之和,而不是与企业年金账户个人缴费纳税抵扣上限相等。采取商业养老保险的个人缴费扣税上限和企业年金个人缴费扣税上限相同的方案,看似平等实则不公。

关键词：商业养老保险个税递延缴费上限 OLG

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

成核剂在高刚性高耐热PPK1735开发中的应用

引用

合成树脂及塑料 2012年第6期29卷 21-23页

作者：赵春红中国石油化工股份有限公司北京燕山分公司化工二厂北京市102501

在气相法聚丙烯(PP)装置上开发了高刚性高耐热PP K1735树脂,分析了成核剂种类和添加量对产品结晶行为及性能的影响。在成核剂的作用下,PP结晶温度提高,制品加工的冷却时间缩短;结晶形态也发生明显变化,晶粒变得致密、细碎。树脂的刚性... 详细信息

在气相法聚丙烯(PP)装置上开发了高刚性高耐热PP K1735树脂,分析了成核剂种类和添加量对产品结晶行为及性能的影响。在成核剂的作用下,PP结晶温度提高,制品加工的冷却时间缩短;结晶形态也发生明显变化,晶粒变得致密、细碎。树脂的刚性、热性能明显提高。产品弯曲模量达1 900 MPa左右,负荷变形温度大于100℃,其他性能均达到指标要求。

关键词：聚丙烯高刚性高耐热成核剂气相法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

国内第一辆LNG-汽油两用燃料汽车

引用

天然气工业 2003年第5期23卷 100-101页

作者：赵春红河南中原绿能高科有限责任公司科研所

LNG是一种比CNG更清洁、高效的优质能源。LNG作为车用燃料比CNG具有两大显著优点 :一是储罐自重轻 ,一次行驶里程长 ;二是优化了发动机性能 ,延长了发动机寿命。文章介绍的我国改装成功的第一辆LNG -汽油电控喷射两用燃料汽车就是在保... 详细信息

LNG是一种比CNG更清洁、高效的优质能源。LNG作为车用燃料比CNG具有两大显著优点 :一是储罐自重轻 ,一次行驶里程长 ;二是优化了发动机性能 ,延长了发动机寿命。文章介绍的我国改装成功的第一辆LNG -汽油电控喷射两用燃料汽车就是在保留原车供油系统不变的前提下增加了一套车载LNG燃料供给系统。后者由LNG车用储罐、调压阀、汽化器、减压调压阀、步进电机及ECU控制系统、混合器及安全系统等组成。经试车表明 ,该车电控燃料转换过渡平稳 ,经济性、动力性均较好 :速度在 10 0km/h以下行驶 ,使用LNG燃料与使用汽油时动力相同 ;最高时速达到 14 0km/h时 ,动力性仍然平稳。

关键词：中国 LNG 液化天然气汽油双燃料汽车储存装置动力经济效益

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

坡面不同侵蚀沟断面特征及水力几何形态

引用

水科学进展 2016年第1期27卷 22-30页

作者：赵春红高建恩西北农林科技大学陕西杨凌712100 清华大学水沙科学与水利水电工程国家重点实验室北京100084 中国科学院水利部水土保持研究所陕西杨凌712100

通过整理和分析国内外大量野外调查数据,系统研究了裸露坡耕地壤土土质不同侵蚀沟的断面特征和水力几何形态,并给出了相应的判别标准。结果表明：随坡面侵蚀沟逐步发展,宽深比参数ζ逐渐减小,细沟、浅沟、切沟和冲沟适宜的ζ范围分别为5... 详细信息

通过整理和分析国内外大量野外调查数据,系统研究了裸露坡耕地壤土土质不同侵蚀沟的断面特征和水力几何形态,并给出了相应的判别标准。结果表明：随坡面侵蚀沟逐步发展,宽深比参数ζ逐渐减小,细沟、浅沟、切沟和冲沟适宜的ζ范围分别为5-17、2-5、0.4-1.8和0.1-0.6;同一侵蚀沟条件下,壤土类型对ζ值也有影响。土壤质地越细,ζ值越小。不同侵蚀沟水力几何形态指数也不相同,细沟的形态指数β1、β2和β3分别为0.3、0.4和0.3,浅沟和切沟为0.4、0.4和0.2,冲沟为0.5、0.4和0.1。验证结果表明给出的判别标准可以用来界定不同侵蚀沟类型。

关键词：坡耕地侵蚀沟宽深比水力几何形态判别标准

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

企业年金纳税递延与财政预算平衡

引用

保险研究 2015年第10期 96-106页

作者：赵春红中央财经大学保险学院北京100081

本文在一般均衡的世代交叠模型下,以无纳税递延的基本经济体为基准,分别研究了削减政府购买和提高年轻人税率两种财政预算平衡方式下,企业年金纳税递延政策对诸如资本存量、产出、利率、工资、储蓄以及消费等经济变量产生的影响。研究... 详细信息

本文在一般均衡的世代交叠模型下,以无纳税递延的基本经济体为基准,分别研究了削减政府购买和提高年轻人税率两种财政预算平衡方式下,企业年金纳税递延政策对诸如资本存量、产出、利率、工资、储蓄以及消费等经济变量产生的影响。研究结果表明,在削减政府购买的财政预算平衡方式下,企业年金纳税递延将提高资本存量和产出,提高工资并且降低利率,提高两期消费和效用水平;在提高年轻人税率的财政预算平衡方式下,企业年金纳税递延产生的经济效应恰恰相反。

关键词：企业年金纳税递延预算平衡经济效应

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：