Application of flexible friction nano-generator in human motion information acquisition

Under the background of the wide application of intelligent wearable devices, the application of flexible friction nanogenerator in human motion information acquisition is studied. According to the actual needs of energy supply of wearable electronic devices and human motion information acquisition, a flexible friction nanogenerator was prepared by using polyester fiber nickel plated conductive cloth and room temperature vulcanized silica gel polymer as friction positive and negative materials for human motion information acquisition. Set relevant parameters for test. The output peaks of short-circuit current and open circuit voltage are 5 respectively μA and 50 V. The test shows that the output energy can drive the calculator and digital clock to work in real time, and can realize the collection of human motion information.

Epsilon-negative media from the viewpoint of materials science

A comprehensive review of the fundamentals and applications of epsilon-negative materials is presented in this paper. Percolative composites, as well as homogeneous ceramics or polymers, have been investigated to obtain the tailorable epsilon-negative properties. It's confirmed the anomalous epsilon-negative property can be realized in conventional materials. Meanwhile, from the perspective of materials science, the relationship between the negative permittivity and the composition and microstructure of materials has been clarified. It's demonstrated that the epsilon-negative performance is attributed to the plasmonic response of delocalized electrons within the materials and can be modulated by it. Moreover, the potential applications of epsilon-negative materials in electromagnetic interference shielding, laminated composites for multilayered capacitance, coil-less electric inductors, and epsilon-near-zero metamaterials are reviewed. The development of epsilon-negative materials has enriched the connotation of metamaterials and advanced functional materials, and has accelerated the integration of metamaterials and natural materials.

Tonality of the Concept “Refugee” in the German Mass-Media Discourse of Different Political Content

Recently, there have been profound social, political and economic changes in Europe, associated with a huge influx of refugees. The relevance of the studied language problem is connected with the changes that took place in Germany which have influenced the state, political parties and the population’s attitude towards refugees, and, in particular, the presentation of the unresolved problems of the hosting and integration of refugees in the publicist discourse. About four years have passed since the crisis began, however, many topics still cause controversy and discussion, which in turn is reflected in the press. The article aims to analyse the tonality of the concept “Refugee” in the German mass-media discourse of different political content. The leading method of the research is the sentiment analysis of the studied concept “Refugee” using sentiment dictionaries and considering articles from liberal (Die Tageszeitung (Taz)), conservative (Deutschland Kurier) and social-democratic newspapers (Stern). As a result of the analysis, it has been found that the social-democratic Stern is the newspaper with the most negative tonality with the arithmetic average of 0.184. The liberal newspaper Die Tageszeitung (Taz) has depicted the refugee crisis with more positive publications with the arithmetic average of 0.374. The conservative newspaper Deutschland Kurier, with the arithmetic average of 0.269, is in the middle. During the analysed period, Stern has 58% negative, 40.3% positive and 1.34% neutral publications. Taz has 53% positive and 47% negative publications, without any neutral articles at all. Deutschland Kurier has more negative materials (57%) than neutral (28%) and positive materials (15%). The materials of the article can be applied in linguistics, stylistics and lexicology of the Russian and German languages; in linguistic regional geography and intercultural communication. The method of dictionary-based sentiment analysis may find further application of the political discourse tonality analysis.