Subjects: Library Science，Information Science >> Information Science submitted time 2023-04-01 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/Significance] To explore the user role classification methods, key factors of role formation, transformation characteristics and differences of the Q&A platforms in the context of infectious disease outbreaks. [Method/Process] A total of 702,927 data related to Covid-19 epidemic were collected from Q&A platforms. The user roles were analyzed from the dimensions of participation and value. The influencing factors of community user role formation were constructed based on the information user factor, information factor and information environment factor. The key factors affecting the formation of different roles were analyzed by combining the multi-classification model and the SHapley Additive exPlanations (SHAP) model. The FP-growth association rule algorithm was used to mine behavior patterns and topic characteristics during the transformation of different roles. [Result/Conclusion] The results show that users tend to keep their roles unchanged, and the transformation direction is mainly towards active or diving roles. The amount of information is the key factor for the formation of different roles. There are significant differences in the extent of change in user role transformation characteristics in different transformation stages and user role transformation behaviors in all transformation stages.
Subjects: Library Science，Information Science >> Information Science submitted time 2023-04-01 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] Due to the rapid spread and deterioration of public emergencies, emergency management departments need to evaluate the severity of emergencies in real time and establish a scientific early warning mechanism. Microblogging and other social media platforms provide rich clues for the real-time study and judgment of emergencies. [Method/process] This study constructed the severity assessment indexes of emergencies from the dimensions of the netizens’ role, the Internet media’s role, the spread of events, attitudes and feelings of netizens. The methods of analyzing the influence tendency of the emergency severity indexes and comparing the features were put forward. A total of 1 107 308 microblogging entries regarding four social security incidents of "8.24 Yueqing Girl Riding Murder" "5.6 Zhengzhou Stewardess Taxi Murder" "8.27 Kunshan Knife-Cutting Case" in 2018 and "Ctrip Kindergarten Abuse Incident" in 2017 were investigated. [Result/conclusion] The results of the study establish a quantitative classification standard for public emergencies, and provide method guidance and data support for the governments to take emergency management measures in time.
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-31 Cooperative journals: 《农业图书情报学报》
Abstract： [Purpose/Significance] A library portal website is related to the function and social image of a library. Library website construction is also one of the tasks of the development of library cause in China during the 14th Five-Year Plan period. However, the website construction level of small and medium-sized libraries at and below the county level in China is relatively low, and effective measures are urgently needed to improve it. To this end, Japanese libraries' experience is worth learning about. Therefore, we take the websites of the municipality libraries in the Tokyo Metropolitan Area as the research objects to explore the information construction and design concept of the websites of small and medium-sized libraries in Japan, so as to provide suggestions for the improvement of the website of grass-roots libraries at and below the county level in China. [Method/Process] Firstly, we analyzed and expounded on the construction principles of small and medium-sized library websites in Japan. Then we conducted a network survey on the website construction of the libraries in Tokyo and summarized the information construction and design concept of the websites from the three aspects of website structure, UI, and function design. In terms of website structure, we investigated the design of navigation, retrieval (simple retrieval, advanced retrieval, and bibliography recommendation), regional data area, juveniles' pages (children's page, teenagers' page), mobile terminal, etc. In terms of UI, we investigated interaction design, color matching, visual identity, etc. In terms of functions, we focused on exploring the accessibility services, business support services, and education support services of the websites based on the concept of a "problem-solving library" in Japan. [Results/Conclusions] The structural design of Japanese small and medium-sized libraries' websites is oriented to the convenience of the people and pays attention to the needs of children and the regional cultural characteristics. The UI design is simple and intuitive, the color matching is soft, and the visual identity is clear. Their functional design focuses on problem-solving, especially in accessibility, business, and education support services. Therefore, according to the theory of responsible innovation, this paper puts forward four suggestions for the website construction of small and medium-sized libraries in China: (1) to be focused on local characteristics and strengthening the construction of local information resources; (2) to take users as the center to meet the diversified cultural needs; (3) to optimize basic services and improve service convenience and ease of use; (4) to rely on the general-branch library system to ensure operation to achieve sustainability.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： N-doped titania hollow mesoporous microspheres (N-THS) with good spherical morphology were prepared via LBL self- assembly and calcination method by using triethylamine as nitrogen source. The structure and photocatalytic property of N-THS were investigated with XRD, XPS and UV-Vis DRS. Results show that parts of N inserted into the TiO2 lattice and replace parts of O, thereby change the chemical state of Ti and O in the lattice. After calcination in a temperature range 400-600℃, anatase TiO2 was obtained for the N-THS, while rutile TiO2 appears when calcination at temperatures up to 700℃. The particle size of TiO2 increases with the increasing calcination temperature. N-THS exhibit strong photoabsorption ability in the visible light region with a clearly red- shifted absorption spectral band. Correspondingly N-THS show good degradation efficiency for methyl orange solution, and along with the decreasing calcination temperature the visible light region absorption ability and the degradation efficiency of N-THS may be enhanced. The degradation efficiency of N-THS calcinated at 400℃ can reach 93.5% after 80 min light irradiation.
Subjects: Medicine, Pharmacy >> Clinical Medicine submitted time 2019-02-25 Cooperative journals: 《协和医学杂志》
Abstract：患者男性８０ 岁 主诉 “尿色加深 １ 月ꎬ 发现胆管壁增厚、 胰体低回声 １ 周” 于 ２０１６ 年 ３ 月 ５ 日收入北京协和医院基本外科。
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