1,597 research outputs found

    A study of the singularity locus in the joint space of planar parallel manipulators: special focus on cusps and nodes

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    Cusps and nodes on plane sections of the singularity locus in the joint space of parallel manipulators play an important role in nonsingular assembly-mode changing motions. This paper analyses in detail such points, both in the joint space and in the workspace. It is shown that a cusp (resp. a node) defines a point of tangency (resp. a crossing point) in the workspace between the singular curves and the curves associated with the so-called characteristics surfaces. The study is conducted on a planar 3-RPR manipulator for illustrative purposes.Comment: 4th International Congress Design and Modeling of Mechanical Systems, Sousse : Tunisia (2011

    A critical analysis of anti-Islamisation and anti-immigration discourse:the case of the English Defence League and Britain First

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    This paper examines the discursive strategies employed by two of the far-right movements in the UK, specifically in the English Defence League (EDL) and Britain First, when dealing with immigration and what they term as the “Islamisation of Britain”. The paper will demonstrate how these movements frame their arguments by employing strategies of positive-self and negative-other representation. The analysis will rely on the Discourse Historical Approach (DHA) as a framework for examining the mission statements of both movements in relation to three discursive strategies, namely nomination, predication and argumentation. The analysis will reveal how both movements put themselves forward as defenders of British society and basic liberal values, while negatively portraying “the other” either as a threat to such values or as a burden on Britain’s resources

    A critical evaluation of teaching practice in geography in Egypt

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    The central problem of this research is 'How the supervision and assessment process for the geography student-teachers in Egypt can he improved?’. This problem is of high significance for a number of reasons : First there is a lack of clear criteria for the assessment of the geography students. Secondly, college students themselves have no handbook to guide their performance. Thirdly, the problem becomes more acute when the number of students reaches several thousands, while the number of experienced supervisors does not increase accordingly. The research is sub-divided into several areas : a) a review of the related literature; b) an assessment of the range of influences which have shaped the development of teacher education in Egypt and the emergence of a system of teaching practice as an integral component of that educational process; c) an evaluation of the de facto status of teaching practice in the El Sharkia Governorate as a case study; d) an assessment of current practices of supervision and assessment of geography students in England and Wales; e) the formulation of a more appropriate framework for supervision and schedule for assessment for use in the Egyptian context and f) an improvement in the entire system by which student-teachers of geography are supervised and assessed in teaching, practice and making recommendations for further lines of research. The results of this research will contribute to the development of the geography teacher preparation and training in particular and to the education of Egypt in general
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