期刊文献+
共找到14篇文章
< 1 >
每页显示 20 50 100
The Theory of Soil and Water Ecology is the Common Theoretical Basis in the Field of Ecological Environment
1
作者 SUN Fazheng 《Journal of Landscape Research》 2022年第2期95-98,共4页
From the perspective of system concept and practical needs,the field of ecological environment needs new theories that can grasp the whole and command the overall situation.Soil and water ecology is the holistic view ... From the perspective of system concept and practical needs,the field of ecological environment needs new theories that can grasp the whole and command the overall situation.Soil and water ecology is the holistic view of nature of seeing both macrocosm and microcosm,is the largest common divisor of various types of ecosystems on the earth and will effectively integrate all ecological processes related to human beings,animals and plants.Starting from the principle of soil and water ecology,the paper resolved that:①the essence of landscape,forest,field,lake,grass,sand and ice is soil and water ecology and;②the fundamental reason of the ecological and environmental crises of climate change,global warming and loss of biodiversity lies in the change and destruction of the earth’s soil and water ecology.The theory of soil and water ecology is a major scientific issue related to the fundamental and overall situation of the ecological environment,is the golden key to understand and solve contemporary ecological and environmental issues and is the common theoretical basis in the field of ecological environment. 展开更多
关键词 Soil and water ecology Theory of soil and water ecology Ecological environment theoretical basis
下载PDF
ODD AND EVEN SYMMETRY OF ATMOSPHERIC CIRCULATION—THEORETICAL BASIS AND CLIMATIC CHARACTERISTICS
2
作者 管兆勇 徐建军 王盘兴 《Acta meteorologica Sinica》 SCIE 1994年第2期187-194,共8页
Analysis is done of the distribution of odd and even symmetric components of circulations on a global basis in terms of observations and technique for the odd/even symmetry,indicating that climatic features of the com... Analysis is done of the distribution of odd and even symmetric components of circulations on a global basis in terms of observations and technique for the odd/even symmetry,indicating that climatic features of the component patterns and their temporal evolution are able to reveal their influence of land-sea discrepancy in the Northern and Southern Hemispheres,the time scale of atmospheric response to radiation heating,circulation waveform structure and seasonal adjustment of global circulation. 展开更多
关键词 atmospheric circulation SYMMETRY theoretical basis climatic characteristics
原文传递
Theoretical and Practical Basis for Progressive Multi-face Technology of Mine Development
3
《Journal of Earth Science》 SCIE CAS CSCD 2000年第2期22-23,共2页
关键词 theoretical and Practical basis for Progressive Multi-face Technology of Mine Development
下载PDF
Research Progress and Prospects of Total Factor Productivity in the Construction Industry
4
作者 Chen WANG Shijie YU +2 位作者 Chenhao LIANG Lidan CAI Xiaohong XIONG 《Asian Agricultural Research》 2024年第7期39-41,共3页
The high-quality development of the construction industry fundamentally stems from the significant improvement of total factor productivity.Therefore,it is of crucial significance for promoting the development of the ... The high-quality development of the construction industry fundamentally stems from the significant improvement of total factor productivity.Therefore,it is of crucial significance for promoting the development of the construction industry to a higher level by scientifically and accurately measuring the total factor productivity of the construction industry and deeply analyzing the influencing factors behind it.Based on a comprehensive consideration of research methods and influencing factors,this paper systematically reviews the existing relevant literature on total factor productivity in the construction industry,aiming to reveal the current research development trend in this field and point out potential problems.This effort aims to provide a solid theoretical foundation and valuable reference for further in-depth research,and jointly promote the continuous progress and development of total factor productivity research in the construction industry. 展开更多
关键词 Construction industry Total factor productivity Research progress Influence factor theoretical basis
下载PDF
Distribution Characteristics and Shielding Effects of Ion Clouds 被引量:1
5
作者 Hui YANG Zhongqiu SHI +3 位作者 Renhong GUO Yixian QIU Qiaobin WEI Yu HUANG 《Meteorological and Environmental Research》 CAS 2023年第2期42-44,49,共4页
The latest research shows that the ions generated by the corona discharge of lightning rod have dual functions of attracting and shielding lightning discharge. After the lightning rod is installed at a certain height ... The latest research shows that the ions generated by the corona discharge of lightning rod have dual functions of attracting and shielding lightning discharge. After the lightning rod is installed at a certain height on the ground,the lightning rod tip reaches the corona threshold to ionize the surrounding air and generate positive and negative ions under the action of the electric field at the end of the lightning downward leader. Constrained by Coulomb’s Law,its positive ions( opposite charges attract each other) form an upward leader( streamer),which moves towards the end of the lightning downward leader and is connected to the downward leader,establishing a discharge channel to attract lightning to the needle tip and discharge the current to the ground,and playing a role in attracting lightning. Its negative ions are repelled by the electric field at the end of the lightning downward leader( repelled by isotropic charges) and influenced by the wind,and diffuse in the downwind area to form an ion cloud,inhibiting the growth of corona at the tip of ground objects,and playing a role in shielding lightning. In this paper,Franklin’s understanding of the role of lightning rod and Yang Shaojie’s new definition of the working principle of lightning rod are briefly introduced. The formation mechanism,distribution characteristics,shielding effect,and impact on lightning strike point distribution of ion clouds are analyzed. Additionally,the important role of shielding effects of ion clouds in regional lightning protection is introduced,which provides a theoretical basis for the correct understanding and use of lightning rod. 展开更多
关键词 Lightning rod Ion clouds Distribution characteristics Regional lightning protection theoretical basis
下载PDF
Correlation between the Change in the Number of Apis mellifera Worker Bees and Nectar Secretion of Nectariferous Plants
6
作者 余玉生 张祖芸 +2 位作者 宋文菲 卢焕仙 王艳辉 《Agricultural Science & Technology》 CAS 2014年第1期116-118,136,共4页
[Objective] This study aimed to clarify the correlation between changes of Apis mel ifera and the nectar secretion characteristics of nectariferous plants. [Method] Considering the nectar secretion characteristics of ... [Objective] This study aimed to clarify the correlation between changes of Apis mel ifera and the nectar secretion characteristics of nectariferous plants. [Method] Considering the nectar secretion characteristics of major and auxiliary nec-tariferous plants, six Apis mel ifera colonies were selected for measure the number of eggs, larvae, pupae and adult bees from Jan. to Dec. in 2012; based on that, their annual change curves were also plotted. [Result] The results showed that there were three peaks of the total number of A. mel ifera workers throughout the year:the first occurred on May 15th, with bees developed into an ideal population for col-lecting pomegranate nectar, and the second and third peaks occurred on July 15th and Oct. 15th, respectively, with bees developed into an ideal population for col ect-ing E. ciliate (Thuab) Hyland. [Conclusion] Prevention of Varroa jacobsoni should be carried out with two or more types of acaricides at the late nectar flow stages of the two nectariferous plants(pomegranate and E. ciliate (Thuab) Hyland) when there was a nectar deficiency. Prevention of Tropilaelaps clareae should be timely per-formed with sublimed sulfur in conjunction with acaricides. This study provides a theoretical basis for the high-quality and high-yielding production of honey, as wel as for the product safety. 展开更多
关键词 Apis mellifera Number of worker bees Nectariferous plants CURVE theoretical basis
下载PDF
A Brief Analysis of the Non-commercial Forest Compensation System in China
7
作者 章颖 《Agricultural Science & Technology》 CAS 2013年第5期809-812,共4页
The non-commercial forest is an important natural resource protecting the environment and contributing to the sustainable development of a nation. Due to its crucial positive external effects, it is inevitable policy ... The non-commercial forest is an important natural resource protecting the environment and contributing to the sustainable development of a nation. Due to its crucial positive external effects, it is inevitable policy that non-commercial forestry should be invested by government, thereby formulates the non-commercial forestry compensation system. This paper first discusses the theoretical basis of non-commercial forestry compensation system and the process of establishment of non-commercial forestry compensation system in China, and then analyzes the deficiency in the current compensation system. 展开更多
关键词 Non-commercial forest Compensation system theoretical basis Deftciencies
下载PDF
Four Bases of Xi Jinping's Thoughts on the Government of China
8
作者 Han Qingxiang Wu Lingwei 《Contemporary Social Sciences》 2017年第5期1-9,共9页
Since the 18th CPC National Congress, the CPC Central Committee, led by General Secretary Xi Jinping, has unswervingly adhered to the continuing development of socialism with Chinese characteristics. Through courageou... Since the 18th CPC National Congress, the CPC Central Committee, led by General Secretary Xi Jinping, has unswervingly adhered to the continuing development of socialism with Chinese characteristics. Through courageous practice and excellent innovation, the CPC Central Committee has shaped a series of new ideas, thoughts and strategies of state governing, which serve as scientific guidelines for the actions and theories on further deepening the Reform and Opening-up and accelerating the modernization of socialism in China. Compared with "new ideas and new strategies," the "new thoughts" are more extensive, inclusive and thorough. In fact, "new thoughts" include "new ideas" and "new strategies" and are demonstrated by the latter two. Presenting the new CPC Central Committee's achievements in both practical and theoretical innovations with Xi Jinping's governing thought as the guide can further promote and deepen the essence of General Secretary Xi Jinping's series of key speeches. Xi Jinping's governing thought has its historical basis, realistic basis, theoretical basis and political basis. 展开更多
关键词 Xi Jinping’s governing thought historical basis realistic basis theoretical basis political basis
下载PDF
The Public Law Construction of Government Agencies’Obligations to Disclose When Handling Personal Information in the Digital Age
9
作者 喻文光 郑子璇 SHEN Jinjun(Translated) 《The Journal of Human Rights》 2022年第3期439-461,共23页
The protection of personal information plays an extremely important role in the construction of digital government.The duty to inform is a prerequisite core obligation that the government should fulfill in processing ... The protection of personal information plays an extremely important role in the construction of digital government.The duty to inform is a prerequisite core obligation that the government should fulfill in processing personal information,a concrete expression of the right to self-determination of personal information,and a prerequisite for the right to protection of personal information that works as a fundamental right to defense the intrusion from the government,as well as a procedural regulatory tool to restrain the government’s information power and prevent the risk of infringement.As the rules on the processing of personal information and the duty to inform have both the nature of public law,the government’s processing of personal information is also public law in nature,especially because of the constitutional value and power control function of the duty to inform,the construction of a system for the duty to inform cannot be copied from the rules applicable to private subjects,but should be tailored to the public law characteristics of the government’s processing of personal information,overcoming the shortcomings of the current rough and fragmented legislation,and set up a systematic regulation based on the public law in term of the legal subject,procedure,content,consequences of obligation violations and legal protection. 展开更多
关键词 protection of personal information government’s processing of personal information duty to inform theoretical basis system construction
下载PDF
Rise and Prospects of Ecological Civilization
10
作者 Feng Lei Fang Jiangping 《Meteorological and Environmental Research》 CAS 2014年第5期9-12,共4页
In recent decades, with the constant progress of society, the study of ecological civilization has attracted extensive attention of scholars at home and abroad, and more in-depth research on its theory and application... In recent decades, with the constant progress of society, the study of ecological civilization has attracted extensive attention of scholars at home and abroad, and more in-depth research on its theory and application has been conducted. In this paper, the historical background, theoretical and realistic bases of ecological civilization were analyzed, showing that the birth and development of ecological civilization is inseparable from the historical development of human society. Then the development prospects and application fields of ecological civilization were discussed further. 展开更多
关键词 Ecological civilization RISE Historical background theoretical and practical basis Development prospects Application fields
下载PDF
Review of tourism resources valuation
11
作者 Shao Xiaoye Cheng Shengkui Chen Yuansheng 《Ecological Economy》 2006年第4期449-456,共8页
Tourism resources valuation is now a hot issue of the science of tourism resources, resources economics and environmental economics. This paper reviews research progresss on tourism resources valuation, introduces its... Tourism resources valuation is now a hot issue of the science of tourism resources, resources economics and environmental economics. This paper reviews research progresss on tourism resources valuation, introduces its theoretic basis, and elaborates two classical valuation methods: TCM and CVM. And two existing problems are discussed Firstly, tourism resources value constitution system is still under dispute. This paper puts forward the Value constitution system based on present value categories. Secondly, tourism resources valuation methods need further studies because both TCM and CVM have deficiencies. Finally, the paper points out the development direction of tourism resources valuation. 展开更多
关键词 Tourism resources value Research progress Theoretic basis PROBLEMS TRENDS
下载PDF
The Principle of Square Hole Machining and It's Tooling Structure Design
12
作者 Jinxia NIU 《International Journal of Technology Management》 2015年第2期7-8,共2页
In order to meet the rapid needs of processing square hole in mechanical equipment, the paper expounds the square hole processing method: planetary wheel method, and analyze the principle of tooling structure and pro... In order to meet the rapid needs of processing square hole in mechanical equipment, the paper expounds the square hole processing method: planetary wheel method, and analyze the principle of tooling structure and process with computer graphics parameters design. The results that, as long as the appropriate parameters, using the above method not only can punch the square hole, can also be processed triangle, the five angle and hexagonal regular polygon holes. The square hole processing method can provide theoretical basis and engineering reliable reference for related engineering and technical personnel. 展开更多
关键词 Abstract: In order to meet the rapid needs of processing square hole in mechanical equipment the paper expounds the square hole processing method: planetary wheel method and analyze the principle of tooling structure and process with computer graphics parameters design. The results that as long as the appropriate parameters using the above method not only can punch the square hole can also be processed triangle the five angle and hexagonal regular polygon holes. The square hole processing method can provide theoretical basis and engineering reliable reference for related engineering and technical personnel. Keywords: Square hole processing Planet wheel Lelo triangle Square hole drilling
下载PDF
Urban water system theory and its model development and application 被引量:1
13
作者 Jun XIA Yongyong ZHANG +7 位作者 Dunxian SHE Shiyan ZHANG Jun YANG Mingquan LV Xiang ZHANG Anqi LUO Shengjun WU Yang LIU 《Science China Earth Sciences》 SCIE EI CAS CSCD 2024年第3期704-724,共21页
The urban water system theory is an extension of the basin water system science on an urban scale, providing a new systematic solution for the unbalanced human-water relationship and severe water challenges, such as w... The urban water system theory is an extension of the basin water system science on an urban scale, providing a new systematic solution for the unbalanced human-water relationship and severe water challenges, such as waterlogging, black and odorous water, and ecological degradation caused by urbanization. Most existing studies on urban water systems have focused on individual water cycle processes linked with water supply and sewage treatment plants, but mutual feedback between the water cycle and its associated material circulation and water ecology, as well as human processes, still needs further exploration. In this paper, the concept, theory, and technical methodology of the urban water system were developed based on the water cycle and basin water system science. The Urban Water System 5.0(UWS 5.0) model was developed by integrating the Time Variant Gain rainfall-runoff Model with Urban water system(TVGM_Urban) in different underlying surface conditions for analyzing the natural-social water cycle processes and their associated water environmental and ecological processes and the influence of multiscale sponge measures. Herein, five major simulation functions were realized: rainfall-runoff-nonpoint source pollutant load,water and pollutant transportations through the drainage network system, terminal regulation and purification, socioeconomic water cycle, and water system assessment and regulation. The location for the case study used in this paper was Wuhan City. The findings showed that the entire urban water system should consider the built-up area and its associated rivers and lakes as the research object and explore the integrations among the urban natural-social water cycle and river regulations inside and outside of the city as well as the effects of socioeconomic development and sponge measures on the water quantity-quality-ecology processes. The UWS 5.0 model efficiently simulated the urban rainfall-runoff process, total nitrogen(TN) and total phosphorus(TP) concentrations in water bodies, and characteristic indicators of socioeconomic development. For the rainfall-runoff simulations, the correlation coefficient and Nash-Sutcliffe efficiency(NSE) fall under the excellent and good classes, respectively. For the TN and TP concentration simulations, results exhibited good bias and the correlation coefficients exceeded 0.90 for 78.1% of the sampled sites. The simulation of 18 socioeconomic indicators provided excellent bias, correlation coefficient, and NSE values of 100%, 83.3%, and 69.4% to total indicators, respectively. Based on the well-calibrated UWS 5.0 model, the source sponge,artificial enhancement, and source reduction-path interception-terminal treatment measures were optimized, which considerably mitigated waterlogging, black and odorous water, and lake eutrophication, respectively. The mitigation performance revealed that the maximum inundated area for a once-in-10-year rainfall event was reduced by 32.6%, the removal ratio of the black and odorous water area was 65%, the comprehensive trophic state index of water bodies was reduced by 37%, and the green development level of Wuhan City in 2020 increased from 0.56 to 0.67. This study is expected to advance the intersection and development of multidisciplinary fields(e.g., urban hydrology, environmental science, and ecology) and offer an important theoretical and technical basis for solving urban complex water issues and promoting green development of cities. 展开更多
关键词 Urban water system Human-water relationship Water issue Green development theoretical basis Mathematical model
原文传递
Traditional Chinese medicines for non-small cell lung cancer: Therapies and mechanisms 被引量:1
14
作者 Fanming Kong Chaoran Wang +5 位作者 Linlin Zhao Dongying Liao Xiaoqun Wang Binxu Sun Peiying Yang Yingjie Jia 《Chinese Herbal Medicines》 CAS 2023年第4期509-515,共7页
The most common subtype of lung cancer is non-small cell lung cancer(NSCLC), which has a poor prognosis and seriously threatens the health of human beings. The multidisciplinary comprehensive treatment model has gradu... The most common subtype of lung cancer is non-small cell lung cancer(NSCLC), which has a poor prognosis and seriously threatens the health of human beings. The multidisciplinary comprehensive treatment model has gradually become the mainstream of NSCLC treatment. Traditional Chinese medicine(TCM) can be used effectively either as an adjunctive therapy or alone throughout the NSCLC therapy,which has a significant impact on survival, quality of life, and reduction of toxicity. Therefore, this paper reviewed the theoretical basis, the latest clinical application, and combined treatment mechanisms in order to explore the advantage stage of TCM treatment and the synergistic therapeutic mechanisms. 展开更多
关键词 advantage stage clinical application MECHANISMS non-small cell lung cancer synergistic therapeutic theoretical basis traditional Chinese medicines treatment model
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部