Przewalskia tangutica Maxim. （Solanaceae： Przewalskia） is a perennial herbaceous plant, which is endemic to Tibet and is a rare and endangered Tibetan medicinal plant. In this paper, the morphological characteristi...Przewalskia tangutica Maxim. （Solanaceae： Przewalskia） is a perennial herbaceous plant, which is endemic to Tibet and is a rare and endangered Tibetan medicinal plant. In this paper, the morphological characteristics, seed germination, tissue culture, flower development characteristics, chemical composition, element content and resource characteristics of P. tangutica are summarized and analyzed. Combined with the survival status of P. tangutica, it is suggested that the research on ecological adaptation, survival mechanism, endangerment mechanism and eco- logical functions of P. tangutica should be strengthened.展开更多
There are many different versions of A Dream in Red Mansions and some versions are different from the others in content,which has drawn great attention from the academic circle. Since the 20 th century,different schol...There are many different versions of A Dream in Red Mansions and some versions are different from the others in content,which has drawn great attention from the academic circle. Since the 20 th century,different scholars have different views upon which is best among the 13 versions of A Dream in Red Mansions. Some believe that the versions that showthe real writing of Cao Xueqin are the best; while others believe that the versions with the vivid description and artistic influence are the best,and there are still others who stick to both the two views. This paper attempts to overviewsuch researches for almost a century,which is undoubtedly meaningful for the further study of A Dream in Red Mansions in the future.展开更多
Rapid urbanization has led to an increase o f urban artificial landscapes and the transformation of die earths surface, which has caused the dty to lose its functions of flood control and water purificatioiL There ...Rapid urbanization has led to an increase o f urban artificial landscapes and the transformation of die earths surface, which has caused the dty to lose its functions of flood control and water purificatioiL There are frequent urban flooding and waterlogging, deterioration of water quality in rivets and lakes, and increasing water and environmental problems. In response to these situations, the state proposed the construction of a sponge dty. In this paper, the background and rcsearch significance of the sponge city were expounded, the domestic and foreign related reseatch was summarized, and further thinking about the sponge dty in Chim was put forward, in order to clarify the research context of the sponge dty and provide the basis for tiie later research.展开更多
Research on price transmission in vertically markets models the various price data, production index, consumer index and expectations index to proof market integration relations and estimate price transmission cycles,...Research on price transmission in vertically markets models the various price data, production index, consumer index and expectations index to proof market integration relations and estimate price transmission cycles, as well as to find out its function mechanism. Thanks to the development of market integration theory, research in this field explored well-rounded metric models. And the main research results are very closely to. To build up systematic models to input more variables based on demand and supply function, and remove the assumption of constant returns to scale of enterprises involving marketing and fully competitive market would be the development direction in this field. In this way, models draw close to the truth of economic operations.展开更多
With the rapid development of the smart grid, it is necessary to do good corresponding work in relaying protection so as to meet the overall requirements of the smart grid better. So we must focus on the state divisio...With the rapid development of the smart grid, it is necessary to do good corresponding work in relaying protection so as to meet the overall requirements of the smart grid better. So we must focus on the state division, risk analysis and fault diagnosis methods in the relaying protection system, in the basis of fully understanding the advantages and disadvantages of relaying protection system, and then improve the problems existing of relaying protection system at this stage according to the actual situation. This paper aims at the overview of analysis on state evaluation of relaying protection systems.展开更多
为全面系统了解林木腐烂病国内外研究现状和进展情况,检索Web of Science(WOS)核心集和中国知网(CNKI)1990—2022年收录的林木腐烂病相关研究文献,运用CiteSpace 5.8.R3软件对纳入文献的国家、机构、作者共现、关键词聚类及突现等数据...为全面系统了解林木腐烂病国内外研究现状和进展情况,检索Web of Science(WOS)核心集和中国知网(CNKI)1990—2022年收录的林木腐烂病相关研究文献,运用CiteSpace 5.8.R3软件对纳入文献的国家、机构、作者共现、关键词聚类及突现等数据进行可视化分析。经筛选,共纳入WOS文献621篇、CNKI文献1886篇。国际上林木腐烂病研究热度总体呈上升趋势,研究国家以中、美为主,研究机构以高校为主,国内机构和学者非常活跃,合作较多,国家之间合作不足。目前较活跃的高频关键词聚类为taxonomy(分类)、antifungal activity(抗真菌活性)、mycovirus(真菌病毒)和病虫害等。国际上林木腐烂病研究热点及趋势在维度上不断发展,聚焦bark(树皮)、purification(纯化)、lectin(凝集素)、diversity(多样性)等热点问题,国内研究集中于福美砷、木质部、树势、桥接等传统角度,并逐渐关注孢子角、发病规律、抑菌活性等主题的中国国情下的研究。展开更多
文摘Przewalskia tangutica Maxim. （Solanaceae： Przewalskia） is a perennial herbaceous plant, which is endemic to Tibet and is a rare and endangered Tibetan medicinal plant. In this paper, the morphological characteristics, seed germination, tissue culture, flower development characteristics, chemical composition, element content and resource characteristics of P. tangutica are summarized and analyzed. Combined with the survival status of P. tangutica, it is suggested that the research on ecological adaptation, survival mechanism, endangerment mechanism and eco- logical functions of P. tangutica should be strengthened.
文摘There are many different versions of A Dream in Red Mansions and some versions are different from the others in content,which has drawn great attention from the academic circle. Since the 20 th century,different scholars have different views upon which is best among the 13 versions of A Dream in Red Mansions. Some believe that the versions that showthe real writing of Cao Xueqin are the best; while others believe that the versions with the vivid description and artistic influence are the best,and there are still others who stick to both the two views. This paper attempts to overviewsuch researches for almost a century,which is undoubtedly meaningful for the further study of A Dream in Red Mansions in the future.
基金Sponsored by Natural Science Project of Sichuan Provincial Department of Education(15ZA0123)Doctoral Fund of Southwest University of Science and Technology(14zx7136)
文摘Rapid urbanization has led to an increase o f urban artificial landscapes and the transformation of die earths surface, which has caused the dty to lose its functions of flood control and water purificatioiL There are frequent urban flooding and waterlogging, deterioration of water quality in rivets and lakes, and increasing water and environmental problems. In response to these situations, the state proposed the construction of a sponge dty. In this paper, the background and rcsearch significance of the sponge city were expounded, the domestic and foreign related reseatch was summarized, and further thinking about the sponge dty in Chim was put forward, in order to clarify the research context of the sponge dty and provide the basis for tiie later research.
基金Supported by 2012 Basic Science Research Program"Construction of Fruits Equilibrium Model and Prospect of Supply and Demands"of the Institute of Agricultural Economics and Development,CAAS(0052012010)the Special Fund of State Bee Industry System Construction of Ministry of Agriculture(CARS-45-KXJ20)
文摘Research on price transmission in vertically markets models the various price data, production index, consumer index and expectations index to proof market integration relations and estimate price transmission cycles, as well as to find out its function mechanism. Thanks to the development of market integration theory, research in this field explored well-rounded metric models. And the main research results are very closely to. To build up systematic models to input more variables based on demand and supply function, and remove the assumption of constant returns to scale of enterprises involving marketing and fully competitive market would be the development direction in this field. In this way, models draw close to the truth of economic operations.
文摘With the rapid development of the smart grid, it is necessary to do good corresponding work in relaying protection so as to meet the overall requirements of the smart grid better. So we must focus on the state division, risk analysis and fault diagnosis methods in the relaying protection system, in the basis of fully understanding the advantages and disadvantages of relaying protection system, and then improve the problems existing of relaying protection system at this stage according to the actual situation. This paper aims at the overview of analysis on state evaluation of relaying protection systems.
文摘为全面系统了解林木腐烂病国内外研究现状和进展情况,检索Web of Science(WOS)核心集和中国知网(CNKI)1990—2022年收录的林木腐烂病相关研究文献,运用CiteSpace 5.8.R3软件对纳入文献的国家、机构、作者共现、关键词聚类及突现等数据进行可视化分析。经筛选,共纳入WOS文献621篇、CNKI文献1886篇。国际上林木腐烂病研究热度总体呈上升趋势,研究国家以中、美为主,研究机构以高校为主,国内机构和学者非常活跃,合作较多,国家之间合作不足。目前较活跃的高频关键词聚类为taxonomy(分类)、antifungal activity(抗真菌活性)、mycovirus(真菌病毒)和病虫害等。国际上林木腐烂病研究热点及趋势在维度上不断发展,聚焦bark(树皮)、purification(纯化)、lectin(凝集素)、diversity(多样性)等热点问题,国内研究集中于福美砷、木质部、树势、桥接等传统角度,并逐渐关注孢子角、发病规律、抑菌活性等主题的中国国情下的研究。
