检索结果-南通市图书馆

Land use induced blurring of forest-grassland transition in north-west Himalaya-A case study using Moving Split Window boundary detection technique

引用

Journal of Mountain Science 2020年第12期17卷 3085-3096页

作者： Shevita PANDITA Harish Chander DUTT Ecological Engineering Laboratory Department of BotanyUniversity of JammuJammu-180006India

Transition zone or ecotone is a unique community sandwiched between two communities/ecosystems/*** ecotones in Himalaya remained unexplored for many ecological aspects like biodiversity,phyto-sociology,boundary detection and even impact of change in land use pattern(anthropogenic activity).The most accepted and widespread technique called as Moving Split Window(MSW) technique is used for detection of vegetation and environmental boundaries at four different sites in the lesser stratum of north-west *** the four sites were at different distances from the nearest human inhabited *** activities like grazing,herb collection,wood collection *** common at proximal *** activities have led to the change in land use *** this study,we have tried to work out the impact of the change in land use pattern(human interference) on the vegetation and basic environmental parameters like soil pH,electrical conductivity and moisture on forestgrassland ecotone in north-west *** on mountain steepness was also collected and *** dissimilarity profile using the statistical tool Squared Euclidian Distance(SED) indicated that species turnover locations increase with the increase in distance of ecotones from human *** ecotones at distant locations from human villages are characterized with blunt as well as sharp peaks for vegetation data,however,conditions are reverse in case of the proximal *** study also reveals that as the distance between the ecotone and human settlements increases,the complex conditions like multiple vegetation boundaries prevails on the *** this regard,land use induced blurring of forest-grassland transition in north-west Himalaya is summed up in the study.

关键词： Ecotone Moving Split Window Squared Euclidean Distance Transect Dissimilarity function environment variables

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

Empirical Analysis on Influence Mechanism of Cohesiveness and Collective Efficacy of Virtual Community Based on Triadic Reciprocal Determinism

引用

China Communications 2014年第11期11卷 146-155页

作者： NING Lianju LIU Qian XIA Wen School of Economics and Management Beijing University of Posts and Telecommunications Beijing 100876 China

The virtual community has become a new life style as for human,but the public's acceptance is relatively low at *** the research about the mechanism of the influence on the cohesiveness and the collective efficiency in virtual community has an important theoretical value and practical *** the paper,the key variables that affect virtual community cohesiveness are extracted from two aspects—self-perception of community members and community environment,and the influence mechanism model of virtual community cohesiveness and community collective efficiency is established based on Triadic Reciprocal *** means of the questionnaire on the community members and the empirical analysis,the key factors influencing cohesiveness of virtual community are brought up,as well as the mechanism that the four dimensions of cohesiveness work,on collective *** to the results,it is practically meaningful that the problems and insufficiency in the operation of existing virtual community are discovered,which guides the operating managers of the virtual community to formulate operation policy of the virtual community for operating managers to develop strategies.

关键词： virtual community cohesiveness collective efficacy environment variables self-cognition.

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

Discussion on the business performance of life insurance industries in Taiwan and China's Mainland Application of Metafrontier model

引用

Chinese Business Review 2009年第9期8卷 30-43页

作者： James C. Hao Department of Insurance Tamkang University Tamsui 251 Taiwan

When using the Data Development Analysis method for analyzing the efficiency of different firms, it is common to put all similar DMU together for measurement in order to figure out the efficiency values of various DMU. However, such an analysis may easily neglect the source property of an individual DMU, meaning that the differences among various DMUs derive from different environmental backgrounds, e.g. environment variables such as economic civilization, laws and regulations, and political backgrounds. Applying the Metafrontier model can overcome the barriers resulting from the environment variables, and it can analyze and measure the differences among various DMUs which have different source properties. It can also be used for measuring the difference between each group of DMU and all DMUs. Therefore, this study adopts the DEA method, assuming variable returns to scale to evaluate and comparatively analyze the business performance of life insurance industries in Taiwan and China's Mainland based on ＂BBC input orientation＂. When evaluating the business performance, the operating management echelon is affected by uncontrollable external environment variables. Thus, this study applies the Four-Stage Data Envelopment Analysis to discuss the impact of environment variables on business performance and re-measures the business efficiency of life insurance industries in Taiwan and China's Mainland after adjusting the input variables. The demonstration period adopted by this study is from 2003 to 2005, and the research subject comprises 43 companies in Taiwan and China's Mainland, among which, there are 19 companies in Taiwan and 24 companies in China's Mainland, and there are 129 sets of sample data. It is assumed that the discount rate is ？（）, is set as 3% in this paper）, and figured out the change of each life insurance company in technical efficiency in the inter-period accumulative years from 2003 to 2005.

关键词： Metafrontier model Four-Stage Data Envelopment Analysis environment variables

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

考虑环境变量的我国大陆省域旅游业效率测度及优化

引用

旅游管理 2019年第7期

作者：方叶林王芳

旅游业的本质决定了外部环境变量对效率测度的影响。本文基于1997—2015年我国大陆省域旅游产业投入产出数据，利用三阶段DEA(Data Envelopment Analysis，数据包络分析)模型测算了环境变量对旅游业效率的影响，提出有关省域旅游发展的... 详细信息

旅游业的本质决定了外部环境变量对效率测度的影响。本文基于1997—2015年我国大陆省域旅游产业投入产出数据，利用三阶段DEA(Data Envelopment Analysis，数据包络分析)模型测算了环境变量对旅游业效率的影响，提出有关省域旅游发展的对策建议。研究主要结论有：考虑外部环境变量因素后，大部分省域旅游业效率出现变动，当前阶段外部环境变量对旅游发展的各项效率仍有较大影响；外部环境变量对旅游业效率的影响存在一定的空间分异规律，即外部环境变量的引入使得三大地区综合效率与规模效率总体下降，其中，西部地区旅游业发展受到的冲击最大；外部环境变量的引入使得三大地区纯技术效率总体上增加，其中，东部地区受到的影响最大。根据三阶段DEA模型计算结果将省域旅游业效率划分为4种类型，进而提出优化对策：未来东部地区应通过优化外部环境提升纯技术效率，促进旅游发展的集约化增长；中、西部地区应通过优化外部环境降低规模效率，改善旅游业发展的粗放型经营状况。

关键词：旅游业效率环境变量三阶段DEA tourism efficiency environment variables three-stage DEA

来源：人大复印报刊资料评论

在线全文

人大复印报刊资料

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

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

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：