Subjects: Library Science，Information Science >> Library Science submitted time 2023-07-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] As China gradually enters an aging society, a large number of elderly people use mobile social networks to enrich their lives. According to the survey data, WeChat has the largest number of elderly users. The construction of WeChat portraits of elderly users is of great significance to promote the elderly to improve their social ability in the era of mobile Internet and improve their life happiness.[Method/process] In this study, the log data of WeChat elderly users were obtained through the mobile terminal log tracking software. The ability data of elderly users were obtained through the arrangement of experimental contents. After clustering the data results using the k-means algorithm, the data related to the attributes and usage behaviors of elderly users are discussed and analyzed.[Result/conclusion] Based on the clustering results of use behavior data in the portrait system of elderly users, we can conduct an in-depth analysis of the behavior characteristics of WeChat elderly users. We found that WeChat elderly users had lower use intensity, interaction intensity and use ability compared with other user groups. Moreover, WeChat elderly users have significant differences. The more educated the elderly users are, the higher their use ability, interaction intensity and use intensity are. It is of theoretical and practical significance to formulate relevant social guidance policies for the elderly in the development of China's aging society.
Subjects: Library Science，Information Science >> Information Science submitted time 2023-04-01 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] In the process of accelerating the new urbanization strategy in China, it is of great significance to analyze the information behavior characteristics and evolution of migrant workers, so as to realize accurate information poverty alleviation and analyze the information needs of migrant workers in the new urbanization process.[Method/process] Based on defining the migrant workers, on the basis of using the Python language and Xpath with the baidu post bar workers data, using Jieba library to realize participle operation according to the two dimensions of time and content to the data visualization research, online information sharing for the migrant workers group behavior characteristics and evolution were analyzed.[Result/conclusion] The research conclusion reveals that in the process of new urbanization in China, the alienation degree of the acquired content in the online information acquisition behavior of migrant workers continues to deepen, and the level of demand continues to improve. The time feature of online information release behavior is policy-oriented. The urbanization strategy issued by the government, supporting the return of migrant workers to their hometowns, protecting the rights and interests of migrant workers and other policies have an important impact on the evolution of farmers' information behavior. The theme features of online information sharing are diversified.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-19 Cooperative journals: 《金属学报》
Abstract： A combined process of hot deformation with different deformation temperatures plus twostep quenching and partitioning (Q&P) treatment was applied to low carbon alloyed steel. The effect of stress (30% plastic deformation) on the start temperature of martensite transformation (Ms), volume fraction of retained austenite and mechanical properties was analyzed. It found that comparing with specimen treated by conventional two-step Q&P process, the microstructure of steel treated by combined process was finer and finer with the decreasing hot deformation temperature, and the typical curved micromorphology of martensite exists. Moreover, the Ms of specimen treated by combined process is increased with the increasing of deformation temperature. The effect of stress on the Ms can be attributed to the effect of stress on the grain boundaries of austenitic parent phase, where a large amount of dislocation induced by the stress is prior to occur so as to promote formation of martensite. However, the stability of untransformed austenite was improved by the plastic deformation when matensite transformed so as to get the more retained austenite (the highest volume fraction of retained austenite obtained by combined process of hot deformation at 750 ℃ is 17.2%). Moreover, the mechanical properties were improved by the combined process, namely, the highest hardness of specimen were obtained when hot deformation at 650 ℃ and the highest plasticity were obtained when hot deformed at 750 ℃.
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