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关于相对论力学力和加速度方向关系问题的讨论
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作者 陈继桃 《杭州师范学院学报》 1991年第3期82-86,共5页
在相对论力学中,力和加速度的方向是不一致的,本文通过从相对论动力学方程和从某一实例,对相对论力学中的这一特性作了具体的论述。
关键词 相对论力学 ∑参照系 电磁场变换 加速度变换
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Systems Analysis in the Study of the Political Elite
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作者 Nadezhda Ponomarenko 《Chinese Business Review》 2015年第7期354-359,共6页
The main topic of the research is applying of systems approach in studying of political elite. This approach was applied in the analysis of Russia's regional power elite (1991 to 2010). The elite was studied as a c... The main topic of the research is applying of systems approach in studying of political elite. This approach was applied in the analysis of Russia's regional power elite (1991 to 2010). The elite was studied as a complex self-reference system oriented at its own environment, not only in an adaptive way, but first and foremost in structure. The systems approach specifies the following conceptual framework of the study: self-reference, system boundaries, and interaction between the political elite and the surrounding world. Application of the systems analysis to studying the political elite enabled to analyze the structure and functions of the elite, create a model of elitogenesis, and receive study matrix. 展开更多
关键词 political elite system SELF-REFERENCE boundaries of the political elite political elite systems analysis structure of political elite
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New Framework for Evaluating Ecosystem Quality in Nature Reserves based on Ideal References and Key Indicators
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作者 WU Zhenliang HOU Jihua +1 位作者 XU Li HE Nianpeng 《Journal of Resources and Ecology》 CSCD 2022年第3期466-475,共10页
With increasing numbers and types of nature reserves(NRs),objective evaluation and comparison of the effects of different nature NRs on conservation efforts are of great importance for protecting species diversity,ens... With increasing numbers and types of nature reserves(NRs),objective evaluation and comparison of the effects of different nature NRs on conservation efforts are of great importance for protecting species diversity,ensuring reasonable national economic input,and adjusting government management schemes.Developing a method for the combined assessment of flagship or umbrella species and ecosystem quality will improve the evaluation of NRs.However,it is also important to establish a new framework for rapid evaluation of ecosystem quality,supported by the advantages of scientific,economic,and regular principles.Here,we proposed a new framework that incorporates the novel concept of ideal references into evaluation systems,which will facilitate the comparison of results from different periods and regions.Furthermore,from the perspective of making the framework as objective,rapid,and economical as possible,we recommended some key ecological indicators,such as net primary productivity,soil organic matter,plant diversity,for use in the new evaluation framework.The new framework,referred to as“ideal reference and key indicators”(IRKI),can sufficiently meet the requirements for the rapid evaluation of ecosystem quality both regionally and nationally.Furthermore,IRKI can identify the restoration potential and restoration periods of NRs,thus facilitating the rational distribution of resources and enhancing the protective effect.There are many types of NRs in China,and it is necessary to partially alter the assessment methods or parameters for different types of NRs.Overall,IRKI provides a simple,clear,and comparable framework that will strongly enhance the conservation of protected areas(PAs)and facilitate the standardization of management practices. 展开更多
关键词 nature reserve ecosystem quality ideal reference key indicators conservation management
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