In this paper, we report the measurements of impedance spectroscopy for a new olivine-type lithium deficiency Li0.9□0.1NiV0.5P0.5O4 compound. It was synthesized by the conventional solid-state technique. All the X-ray diffraction peaks of the compound are indexed, and it is found that the sample is well crystallized in orthorhombic olivine structure belonging to the space group Pnma. Conductivity and dielectric analyses of the sample are carried out at different temperatures and frequencies using the complex impedance spectroscopy technique. The electrical conductivity of Li0.9□0.1NiV0.5P0.5O4 is higher than that of parent compound LiNiV0.5P0.5O4. Temperature dependence of the DC conductivity and modulus was found to obey the Arrhenius law. The obtained values of activation energy are different which confirms that transport in the title compound is not due to a simple hopping mechanism. To determine the conduction mechanism, the AC conductivity and its frequency exponent have been analysed in this work by a theoretical model based on quantum mechanical tunnelling: the non-overlapping small polaron tunnelling model.
In this chapter, the author shows the reality of English. Some light is shed on the features of today's English. Then, the debate between monolithic standard and pluralist perspective is presented. The linguistic diversity of English is introduced. Based on this diversity, the aim of the study is to summarize the major studies about pedagogy for English as an international language (EIL). In concluding, the transdisciplinary approach is defined, and some ideas are given about how to implement this approach to unify the linguistic diversity of English.
Culture now becomes a key element in most educational systems, particularly in Higher education, where cultural Studies are an essential part of most language instruction. The aim of this chapter is to explore the cultural challenges that hinder the process of learning English in Tunisia and to suggest solutions for overcoming these. A questionnaire was used as the primary data collection material. It was found that lack of authentic materials, lack of cultural knowledge of the target language, poor textbooks, limited exposure to authentic culture environment and native culture interference are considered to be the main problems. The results also showed that these challenges can be remedied by using more authentic materials, revising the content of textbooks, the integration of technology and cultural awareness.
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