410 research outputs found

    Ein endoskopisch einsetzbarer Mechanismus zur Behandlung blutender MagengeschwĂźre

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    Cutting inserts made of glass and glass ceramics

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    Against the background of the increasing cost and scarcity of raw materials that are required for the manufacture of cutting tools, the question of alternative cutting materials arises. Glasses and glass ceramics represent a possibility for this, the use of which has hardly been considered so far. This thesis is devoted to the question of whether cutting tools can be made from glass and glass ceramic materials at all. In addition, the question of how such tools can be used for which purposes is dealt with. First results on both questions are presented. The grinding of indexable inserts from the materials examined was possible without breaking corners and edges. Plastics can be easily machined with the tools produced. When machining aluminum, however, the tools made of glass fail completely, while those made of glass–ceramic show good results here too. These first results are intended to pave the way for further research in this area

    A bibliometric review of the leadership development field:How we got here, where we are, and where we are headed

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    The development of leaders and leadership is a formative research area and a considerable industry in practice. Existing reviews are often restricted in scope or by subjective inclusion of topics or documents which limits integrative implications for the leader/ship development (LD) field. We address theoretical and methodological limitations by mapping the LD field with a comprehensive, objective, and integrative review. To do so we employed three bibliometric approaches, historiography, document co-citation, bibliographic coupling, and included 2,390 primary and 78,178 secondary documents. We show patterns in the evolution of the LD field, followed by four central observations about the current state and trends in LD. To shift the science and practice of LD we develop tangible suggestions for future research within the three research directions: (1) Pursuing research within the current framing of LD, (2) Striving for frame-breaking LD research, and (3) How We Can Get There – Transforming LD Research
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