Parameters determination for the coupled electromagnetic transformer model, with particular reference to winding faults studies

In the past few years, a considerable research effort has been devoted to the development of transformer digital models in order to simulate its behaviour under transient and abnormal operating conditions. Although many three-phase transformer models have been presented in the literature, there is a surprisingly lack of studies regarding the incorporation of winding faults. This paper presents a coupled electromagnetic transformer model for the study of winding inter-turn short-circuits. Particular attention will be given to the model parameters determination, for both healthy and faulty operating conditions. Experimental and simulation test results are presented in the paper, demonstrating the adequacy of the model as well as the methodologies for the parameters determination.

Juegos populares de Caravaca y su comarca

Incluye una tabla de clasificaci??n de los juegos por edades, grado de dificultad, de participaci??n y de competitividad

40 juegos para practicar la lengua española.

Presenta una recopilación de juegos que tiene como objetivo favorecer la expresión oral entre los alumnos, ya sean niños, adolescentes o adultos. Unos juegos que persiguen permitir vencer las dificultades que supone para el no castellanohablante como para el castellanohablante iniciarse en el uso de la lengua como instrumento de comunicación oral en sus relaciones con los demás. Los juegos son explicados con todo detalle con material adjunto para facilitar la labor del profesorado.

Study of the external female genitalia of 14 Rhodnius species (Hemiptera, Reduviidae, Triatominae) using scanning electron microscopy

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Carlosbarbosaite, ideally (UO2)(2)Nb2O6(OH)(2)center dot 2H(2)O, a new hydrated uranyl niobate mineral with tunnels from Jaguaracu, Minas Gerais, Brazil: description and crystal structure

Carlosbarbosaite, ideally (UO2)(2)Nb2O6(OH)(2)center dot 2H(2)O, is a new mineral which occurs as a late cavity filling in albite in the Jaguaracu pegmatite, Jaguaracu municipality, Minas Gerais, Brazil. The name honours Carlos do Prado Barbosa (1917-2003). Carlosbarbosaite forms long flattened lath-like crystals with a very simple orthorhombic morphology. The crystals are elongated along [001] and flattened on (100); they are up to 120 mu m long and 2-5 mu m thick. The colour is cream to pale yellow, the streak yellowish white and the lustre vitreous. The mineral is transparent (as individual crystals) to translucent (massive). It is not fluorescent under either long-wave or short-wave ultraviolet radiation. Carlosbarbosaite is biaxial(+) with alpha = 1.760(5), beta = 1.775(5), gamma = 1.795(5), 2V(meas) = 70(1)degrees, 2V(calc) = 83 degrees. The orientation is X parallel to a, Y parallel to b, Z parallel to c. Pleochroism is weak, in yellowish green shades, which are most intense in the Z direction. Two samples were analysed. For sample I, the composition is: UO3 54.52, CaO 2.07, Ce2O3 0.33, Nd2O3 0.49, Nb2O5 14.11, Ta2O5 15.25, TiO2 2.20, SiO2 2.14, Fe2O3 1.08, Al2O3 0.73, H2O (calc.) 11.49, total 104.41 wt.%; the empirical formula is (square 0.68Ca0.28Nd0.02Ce0.02)(Sigma=1.00)[U-1.44 square O-0.56(2.88)(H2O)(1.12)](Nb0.80Ta0.52Si0.27Ti0.21Al0.11Fe0.10)(Sigma=2.01) O-4.72(OH)(3.20)(H2O)(2.08). For sample 2, the composition is: UO3 41.83, CaO 2.10, Ce2O3 0.31, Nd2O3 1.12, Nb2O5 14.64, Ta2O5 16.34, TiO2 0.95, SiO2 3.55, Fe2O3 0.89, Al2O3 0.71, H2O (calc.) 14.99, total 97.43 wt.%; the empirical formula is (square 0.67Ca0.27Nd0.05Ce0.01)(Sigma=1.00)[U-1.04 square O-0.96(2.08)(H2O)(1.92)] (Nb0.79Ta0.53Si0.42Ti0.08Al0.10Fe0.08)(Sigma=2.00)O-4.00(OH)(3.96)(H2O)(2.04). The ideal endmember formula is (UO2)(2)Nb2O6(OH)(2)center dot 2H(2)O. Calculated densities are 4.713 g cm(-3) (sample 1) and 4.172 g cm(-3) (sample 2). Infrared spectra show that both (OH) and H2O are present. The strongest eight X-ray powder-diffraction lines [listed as d in angstrom(I)(hkl)] are: 8.405(8)(110), 7.081(10)(200), 4.201(9)(220), 3.333(6)(202), 3.053(8)(022), 2.931(7)(420), 2.803(6)(222) and 2.589(5)(040,402). The crystal structure was solved using single-crystal X-ray diffraction (R = 0.037) which gave the following data: orthorhombic, Cmem, a = 14.150(6), b = 10.395(4), c = 7.529(3) angstrom, V = 1107(1) angstrom(3), Z = 4. The crystal structure contains a single U site with an appreciable deficiency in electron scattering, which is populated by U atoms and vacancies. The U site is surrounded by seven 0 atoms in a pentagonal bipyramidal arrangemet. The Nb site is coordinated by four 0 atoms and two OH groups in an octahedral arrangement. The half-occupied tunnel Ca site is coordinated by four 0 atoms and four H2O groups. Octahedrally coordinated Nb polyhedra share edges and comers to form Nb2O6(OH)(2) double chains, and edge-sharing pentagonal bipyramidal U polyhedra form UO5 chains. The Nb2O6(OH)(2) and UO5 chains share edges to form an open U-Nb-phi framework with tunnels along [001] that contain Ca(H2O)(4) clusters. Carlosbarbosaite is closely related to a family of synthetic U-Nb-O framework tunnel structures, it differs in that is has an (OH)-bearing framework and Ca(H2O)(4) tunnel occupant. The structure of carlosbarbosaite resembles that of holfertite.

On the Evolution of the Spatial Economy with Multi-unit/Multi-plant Firms: The Impact of IT Development

This paper examines how the decline of communication costs between management and production facilities within firms and the decrease in trade costs of manufactured goods affect the spatial organization of a two-region economy with multi-unit/multi-plant firms. The development of information technology decreases the costs of communication and trade costs. Thus, the fragmentation of firms is promoted. Our result indicates that, with decreasing communication costs, firms producing low trade-cost products (such as consumer electronics) tend to concentrate their manufacturing plants in low wage countries. In contrast, firms producing high trade-cost products (such as automobiles) tend to have multiple plants serving to segmented markets, even in the absence of wage differentials.

Globalization and the Evolution of the Supply Chain: who gains and who loses?

This paper focuses on two distinct facets of globalization: the decrease in the trade costs of goods and the decline of communication costs between headquarters and production facilities within firms. When the unskilled have about the same wage in the two regions, the decrease of these costs fosters the gradual agglomeration of plants in the core region accommodating the headquarters. By contrast, when the wage gap is significant, the process of integration eventually triggers the re-location of plants into the periphery. In particular, when the process of re-location is driven by falling communication costs, the welfare of all workers living in the core goes down whereas the welfare of those who reside in the periphery rises.

日中経済関係の今後－「対中ODA中止合意」を超えて

日中間では、外交関係が冷え切っていた時にも経済関係は好調を持続していた。実際、両国間貿易、日本の対中直接投資ともに急増し、かつその内容も高度化の様相を示している。当然さまざまな経済摩擦も発生しているが、問題は、摩擦が経済分野に留まらず2005年春の「反日騒動」に見られたように政治問題化したり、逆に政治問題が経済摩擦をもたらす土壌が両国関係に残っていることだろう。本稿ではまず、両国の経済が相互補完関係を深めている現状を確認し、次に経済摩擦の実態と背景を整理する。そして最後にこうした作業を踏まえて、今後の日中経済関係のあり方を探ってみたい。

Production Networks and Spatial Economic Interdependence: An International Input-Output Analysis of the Asia-Pacific Region

The Asia-Pacific Region has enjoyed remarkable economic growth in the last three decades. This rapid economic growth can be partially attributed to the global spread of production networks, which has brought about major changes in spatial interdependence among economies within the region. By applying an Input-Output based spatial decomposition technique to the Asian International Input-Output Tables for 1985 and 2000, this paper not only analyzes the intrinsic mechanism of spatial economic interdependence, but also shows how value added, employment and CO2 emissions induced are distributed within the international production networks.

まえがき/目次/執筆者一覧

2009年度調査研究報告書

総論 グローバリゼーション： 資本主義の最終段階としての

グローバリゼーションとは1989年11月のベルリンの壁崩壊に始まり、2008年9月のリーマン・ショックによって終わった世界資本主義の拡大の最終形態である。この20年間で、世界のGDPは3倍に、貿易額は5倍に、金融資産は30倍に急膨張し、貧困人口は10億人減少した。その急成長を支えたのはIT革命と金融テクノロジーの革命であった。このIT革命と金融革命の結合によって生まれたグローバリゼーションは世界の分業体制を激変させた。中国から東南アジアを経てインドへ至る、アジア大陸東南縁は「世界の工場」と変じ、太平洋島嶼諸国はこの「世界の工場」の後背地となった。そして、島嶼国経済は大陸中国や東南アジアのチャイニーズによって支配されつつある。戦後、太平洋はANZUS(アメリカ・豪・ニュージーランド)三国によるアングロ・サクソンの海だったが、今や地政学的変動が生じつつあるのである。そして、世界のGDPが3倍になるとともに、3倍になった温室効果ガスにより、地球温暖化(グローバル・ウォーミング)の速度は、太平洋の海面上昇をもたらし、それは2.5-5.5メートルに及ぶジャンボ高潮になって島嶼国の海岸・低地帯に襲いかかった。グローバリゼーションは経済的にも気候的にも太平洋島嶼諸国に変動をもたらし、強い社会的、環境的負荷(ストレス)を与えているのである。