Subjects: Library Science，Information Science >> Library Science submitted time 2023-07-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] As the WeChat public platform promotes the intelligent level of library information dissemination and enhances the efficiency of library services, it has been widely used by Chinese libraries as an important self-media platform. In this context, this paper attempts to compare the WeChat public platform of university libraries and public libraries by the data of WeChat public platform.[Method/process]Firstly, the external and internal description data pushed in WeChat public platform was collected via the big data platform of social media and web crawler technology. After cleaning, this data was stored in the Mongo DB database. Secondly, the WeChat communication Index (WCI) was calculated through corresponding algorithm. At the time, the latent dirichlet allocation (LDA) was applied to carry out the topic classification research of texts. Finally, the conceptand quantitative method of information accepting and adopting index(IA&AI) was proposed, and the text feature was extracted by setting of IA&AI threshold.[Result/conclusion] There is strongly positive correlation between the number of readings and the number of praises; theoverall influence of the public platform of university libraries is slightly lower than that of public libraries, but the polarization of WCI exists in both kinds of libraries; after comparative analysis, the similarities and differences of topic classification and text features in high(or low) IA&AI's text are found.Finally, based on the research conclusions, some suggestions were put forward to operate the WeChat public platform of the two kinds of libraries.
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： The source region of Yellow River is the most important water source and in contributing more than 37% of the total streamflow of the whole Yellow River, which makes great significance for water resources security, food production, and the ecological environment in the lower reaches of the river. Clarifying the changes in climatic hydrology and vegetation coverage, especially grassland degradation in the source region of Yellow River is not only a prerequisite for a deep understanding of the hydrological cycle mechanism of this region, but also an accurate grasp of the water resources and ecological environment in the source region and in the middle and lower reaches. Moreover, it is the core issue of implementing the requirements of President Xi Jinping’s “ecological protection and high-quality development in the Yellow River Basin”. According to the meteorological datasets, the source region of Yellow River has experienced a significant warming and wetting process since 1951, and has declined in the 1990s, but the temperature and precipitation have increased at a faster rate since 2000, which has led to the melting of glacial and snow, the increased evapotranspiration, and shrinkage of frozen soil. However, due to the intensification of water loss in various processes and the impact of human activities, this humidification cannot be converted into effective water resources, and the observed and natural streamflow have shown decreasing trends. Moreover, the continuously degraded grassland has continuously reduced the regional water conservation capacity and the ecological environment has continued to deteriorate. Facing the severe water resources and ecological environment challenges of the source region of Yellow River, we recommend that (1) ecological environmental protection be given priority; (2) the orderly development and utilization of water resources; (3) the harmonious coexistence of social production and the natural environment; and (4) the implementation of an orderly adaptation to climate change as a strategic perspective.
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： The Yellow River is known as China’s Mother River, which fosters the great and profound Chinese civilization. However, the frequent flood and drought disasters have also brought serious disasters to the people who live in the Yellow River Basin. At present, significant changes have taken place in the climate and hydrological processes of the Yellow River Basin due to global warming and human activities. The warming and drying climate and increase of human water use in the Yellow River Basin have led to an increase in hydrological drought. Although the Grain for Green program has greatly improved the vegetation coverage on the Loess Plateau and effectively inhibited severe soil erosion, but also enhanced the soil desiccation and enlarged the dry soil layers in this area. These phenomena are not only the major challenges for ecological protection and high-quality development in the Yellow River Basin, but also the basic scientific issues which related to the coordinated development of climate-water-ecology-society.
Hits
Hits
Downloads
Comment