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Power Concept (power + concept)
Selected AbstractsAn approach to the non-active power concept in terms of the poynting-park vectorEUROPEAN TRANSACTIONS ON ELECTRICAL POWER, Issue 5 2001A. Ferrero This paper reconsiders the approach to the electric systems in terms of Maxwell equations, and reconsiders in particular the energy transfer involved in an electric system in terms of the flux of the Poynting vector. This approach is extended to the three-phase systems, and the Park transformation is reconsidered by applying it to the Poynting vector. In this way a correct physical meaning can be assigned to the non-active components of the Park instantaneous power by tracing them back to the components of the Poynting vector. [source] About the role of the park imaginary power on the three-phase line voltage dropEUROPEAN TRANSACTIONS ON ELECTRICAL POWER, Issue 5 2000A. Ferrero In this paper the line voltage drop concept is investigated and extended to non-sinusoidal conditions. The results are applied to the three-phase configuration. In this approach the presence of harmonic and sequence components is taken into account. The formal invariance of the obtained results with respect to the original single-phase relationships is ensured by means of the three-phase rms concept. The Park transformation is used as well, so that the three-phase relationships are reduced to a simpler formal single-phase approach: the simultaneous contributions of harmonic and sequence components are unified in a single formulation. Therefore the Park imaginary power role results as a natural extension of the usual single-phase reactive power concept. [source] Analysis and equivalent circuit of aperture-coupled cavity-fed microstrip patch antennaMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2006Jeong Phill Kim Abstract A simple but accurate equivalent circuit of an aperture-coupled cavity-fed microstrip patch antenna is developed. It consists of ideal transformers, admittance elements, and transmission lines, and the related circuit-element values are computed by applying the reciprocity theorem and complex power concept with the spectral-domain immittance approach. The antenna input impedance calculated from network theory is compared with the measured data, and their good agreement validates the simplicity and accuracy of the proposed equivalent-circuit model. Based on the proposed theory, the effect of structural parameters on the antenna characteristics is also examined. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 843,846, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21493 [source] The "Middle Power" Concept in Australian Foreign PolicyAUSTRALIAN JOURNAL OF POLITICS AND HISTORY, Issue 4 2007Carl Ungerer During the early 1990s, the Hawke and Keating Labor governments promoted Australia's diplomatic credentials as an activist and independent middle power. Labor claimed that by acting as a middle power Australia was constructing a novel diplomatic response to the challenges of the post-Cold War world. But a closer reading of the official foreign policy record since 1945 reveals that previous conservative governments have also taken a similar view of Australia's place and position on the international stage. This essay traces the historical evolution of the middle power concept in Australian foreign policy and concludes with an assessment of the Howard government's more recent reluctance to use this label and its implications for Australia's future middle power credentials. Although its use has waxed and waned in official policy discourse and it is more commonly associated with Labor governments, the middle power concept itself and the general diplomatic style it conveys have been one of the most durable and consistent elements of Australia's diplomatic practice. [source] | ||||||||||