Search Engine Drives the Evolution of Social Networks

The search engine is tightly coupled with social networks and is primarily designed for users to acquire interested information. Specifically, the search engine assists the information dissemination for social networks, i.e., enabling users to access interested contents with keywords-searching and promoting the process of contents-transferring from the source users directly to potential interested users. Accompanying such processes, the social network evolves as new links emerge between users with common interests. However, there is no clear understanding of such a "chicken-and-egg" problem, namely, new links encourage more social interactions, and vice versa. In this paper, we aim to quantitatively characterize the social network evolution phenomenon driven by a search engine. First, we propose a search network model for social network evolution. Second, we adopt two performance metrics, namely, degree distribution and network diameter. Theoretically, we prove that the degree distribution follows an intensified power-law, and the network diameter shrinks. Third, we quantitatively show that the search engine accelerates the rumor propagation in social networks. Finally, based on four real-world data sets (i.e., CDBLP, Facebook, Weibo Tweets, P2P), we verify our theoretical findings. Furthermore, we find that the search engine dramatically increases the speed of rumor propagation.Comment: 9 pages, 11 figure

Room-Temperature Processing of Inorganic Perovskite Films to Enable Flexible Solar Cells

Inorganic lead halide perovskite materials have attracted great attention recently due to their potential for greater thermal stability compared to hybrid organic perovskites. However, the high processing temperature to convert from the non-perovskite phase to cubic perovskite phase in many of these systems has limited their application in flexible optoelectronic devices. Here, we report a room temperature processed inorganic PSC based on CsPbI2Br as the light harvesting layer. By combing this composition with key precursor solvents, we show that the inorganic perovskite film can be prepared by the vacuum-assist method under room temperature conditions in air. Unencapsulated devices achieved the power conversion efficiency up to 8.67% when measured under 1-sun irradiation. Exploiting this room temperature process, flexible inorganic PSCs based on an inorganic metal halide perovskite material is demonstrated.Comment: 23 pages, 4 figures, and supplemental informatio

Reconstruction of Teacher Training Management Model From the Perspective of Group Dynamics

With the implementation of teacher education reform worldwide, the effectiveness of teacher training has become a new focus. In this paper, based on group dynamics theory, a teacher training management mode based on the group dynamic mechanism is constructed, and the teachers’ internal psychological tension is stimulated through dynamic driving mechanism, the group cooperative learning atmosphere is maintained by static condensation mechanism, and the teachers’ learning activity efficiency is guaranteed by the norm constraint mechanism, thus restoring the subject status of teachers in the training, arousing their intrinsic vitality, and improving training efficiency

Comparative studies of salinomycin-loaded nanoparticles prepared by nanoprecipitation and single emulsion method

To establish a satisfactory delivery system for the delivery of salinomycin (Sal), a novel, selective cancer stem cell inhibitor with prominent toxicity, gelatinase-responsive core-shell nanoparticles (NPs), were prepared by nanoprecipitation method (NR-NPs) and single emulsion method (SE-NPs). The gelatinase-responsive copolymer was prepared by carboxylation and double amination method. We studied the stability of NPs prepared by nanoprecipitation method with different proportions of F68 in aqueous phase to determine the best proportion used in our study. Then, the NPs were prepared by nanoprecipitation method with the best proportion of F68 and single emulsion method, and their physiochemical traits including morphology, particle size, zeta potential, drug loading content, stability, and in vitro release profiles were studied. The SE-NPs showed significant differences in particle size, drug loading content, stability, and in vitro release profiles compared to NR-NPs. The SE-NPs presented higher drug entrapment efficiency and superior stability than the NR-NPs. The drug release rate of SE-NPs was more sustainable than that of the NR-NPs, and in vivo experiment indicated that NPs could prominently reduce the toxicity of Sal. Our study demonstrates that the SE-NPs could be a satisfactory method for the preparation of gelatinase-responsive NPs for intelligent delivery of Sal

Implementation Deviation and Correction of the Kindergarten Teacher Qualification System in China

Deviancies such as perfunctoriness, addition, defect and substitution exist in the aspect of kindergarten teacher qualification system in China during its implementation. Implementation deviation of the system stands in the way of achieving institutional objectives, which are certainly a breach of normal institutional order. In the ways of establishing professional group for the recognition of qualifications, perfecting supervision and accountability mechanism, enhancing the operability of kindergarten teacher qualification system and so forth, the effective implementation of kindergarten teacher qualification system in China will then be guaranteed

Researches on China Preschool Education Teachers’ Participatory Training Mode

As the concept of participatory training has been disseminated to pedagogy area, traditional preschool teacher training continuously conflicts with such training of modern mode. In China, in the field of preschool education, participatory training for teachers has been established gradually. This mode is centered on group dynamics to form a constant group dynamics system under the interactive checks and balances of three mechanisms of driving force: the driving force, the cohesive force and the binding force. This thesis mainly elaborates the basic key elements of group structure on the basis of the participatory training mode’s dynamics structure and operation mechanism, and in detail analyzes the main guarantee conditions for healthy operation of the participatory training mode