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An investigation of polyphase machinery from a consideration of magnetic energy
No full textStatement of Problem: The purpose of this paper is to develop torque formulas for polyphase machinery from a consideration of the energy change in their magnetic fields due to a displacement of the magnetic axes of the component fields. Summary: Generalized formulas are developed which relate the energy and change in energy in a magnetic circuit as a result of a displacement of the magnetic axes of the component fields. These formulas are then successively applied to non-salient pole motors and generators, induction motors and generators, reluctance machines, and salient pole motors and generators. Conclusions: The torque formulas developed do not furnish practical working equations, except in the case of the reluctance motor. However, this method of approach should be valuable for instructional purposes. Firstly, it develops formulas from basic concepts. Secondly, it defines power angle in a generalized equation, which may then be conveniently applied to define a power angle in induction motors, and in reluctance motors
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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THE MEXICAN CHAMBER OF DEPUTIES AND THE MEXICAN POLITICAL SYSTEM
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