638 research outputs found
Ding–Iohara–Miki symmetry of network matrix models
No full textAbstractWard identities in the most general “network matrix model” from [1] can be described in terms of the Ding–Iohara–Miki algebras (DIM). This confirms an expectation that such algebras and their various limits/reductions are the relevant substitutes/deformations of the Virasoro/W-algebra for (q,t) and (q1,q2,q3) deformed network matrix models. Exhaustive for these purposes should be the Pagoda triple-affine elliptic DIM, which corresponds to networks associated with 6d gauge theories with adjoint matter (double elliptic systems). We provide some details on elliptic qq-characters
Taxonomic revision of Pinus fujiii (Yasui) Miki (Pinaceae) and its implications for the phytogeography of the section Trifoliae in east Asia
No full textPinus trifolia Miki 1939 (Pinaceae) was originally proposed based on seed cones from the upper Miocene of Aichi and Gifu Prefectures, central Japan. However, before the publication of P. trifolia, a different name (Pinus fujiii (Yasui) Miki) was given to a female cone with the same morphology. On the other hand, P. fujiii auct. non (Yasui) Miki has been used for seed cones with different morphologies from Yasui's holotype, i.e., apophyses arranged in 5:8 parastichies and a perexcentromucronate slightly-pointed umbo. As a result of re-examination on the Miki and Yasui specimens, we concluded that P. trifolia was a synonym for P. fujiii and proposed here Pinus mikii sp. nov. for cones assigned to P. fujiii auct. non (Yasui) Miki. We also emended the diagnosis of P. fujiii based on these specimens. Pinus fujiii is characterized by a large female cone in which the apophyses with a centromucronate prickle-like umbo are arranged in 8:13 parastichies, and deciduous seed wings. These characters suggest that P. fujiii belongs to the section Trifoliae of the subgenus Pinus, which is now restricted to North and Central America and the Caribbean islands. Fossil data suggest that the P. fujiii lineage firstly appeared in Japan around the Eocene/Oligocene boundary. We speculate that the P. fujiii lineage might have moved southward to Japan from a refugium located elsewhere in high-latitude areas in response to the late Eocene cooling event, as occurred with other Trifoliae species in North America. © 2015 Yamada et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Resenha de Livro: Fronteiras da Cidadania. Uma História Negra e Indígena do Brasil Pós-colonial, de Yuko Miki
No full textThe book by historian Yuko Miki represents an outstanding effort to combine two academic fields that have developed independently and rarely communicate with each other: studies on indigenous groups and studies on African-descendend peoples. Her goal is to understand the shared stories and the sometimes divergent trajectories of indigenous and African-descended populations that inhabited a region the author calls the «Atlantic frontier», during the period of the Brazilian Empire (1822-1889). The study shows that this type of academic integration can advance our understanding of nineteenth-century history. It also constitutes an exceptional example of a regional history that makes important contributions to key historiography about Brazil.El libro de la historiadora Yuko Miki constituye un destacado esfuerzo por poner a dialogar dos tradiciones académicas que se han desarrollado de forma independiente y rara vez se comunican: los estudios sobre indígenas y sobre afrodescendientes. Su objetivo es entender las historias compartidas y las trayectorias, a veces divergentes, de las poblaciones indígenas y afrodescendientes que habitaron una región que la autora identifica como «frontera atlántica» durante el período del Imperio brasileño (1822-1889). La obra no solo demuestra lo fructífera que puede ser tal integración académica para entender la historia del siglo XIX, sino que es un ejemplo excepcional de una historia regional que hace aportes indudables en algunos temas clave de la historiografía sobre Brasil.O livro da historiadora Yuko Miki é um esforço notável para colocar em diálogo duas tradições acadêmicas que se desenvolveram de forma independente e raramente são comunicadas: estudos indígenas e afrodescendentes. Seu objetivo é compreender as histórias compartilhadas e as trajetórias por vezes divergentes das populações indígenas e afrodescendentes que habitaram uma região que a autora identifica como a «fronteira atlântica» durante o período do Império brasileiro (1822-1889). A obra não apenas demonstra o quanto essa integração acadêmica pode ser fecunda para a compreensão da história do século XIX, mas é um exemplo excepcional de uma história regional que traz contribuições inquestionáveis para algumas questões-chave da historiografia brasileira
Ommaya reservoir placement using ultrasound guidance via anterior fontanelle combined with frameless electromagnetic neuronavigation in patients with mucopolysaccharidosis type 2 : Case reports and review of the literature
No full textMucopolysaccharidosis type II (MPS II) results from the genetic deficiency of a lysosomal enzyme and is associated with central nervous system (CNS) dysfunction. In Japan, in addition to intravenous enzyme administration, intracerebroventricular enzyme delivery through the Ommaya reservoir has recently gained approval. Nevertheless, the ideal approach for safely implanting the reservoir into the narrow ventricles of infantile MPS II patients remains uncertain. In this report, we present two cases of successful reservoir placement in infantile MPS II patients using ultrasound guidance via the anterior fontanelle, coupled with flameless electromagnetic neuronavigation
The Concept of Myth in Kōsaka Masaaki and Miki Kiyoshi’s Critique
No full textThis paper explores the concept of myth in two books written by Kōsaka Masaaki, The Historical World (1937) and Philosophy of the Nation (1942). In both, myth appears as a central moment in the transition from primitive to modern societies. The role of myth is closely related to Kōsaka’s notion of nature, since one goal of his reflection is to show how history is supported by the “substratum” of nature. In this sense, he also distinguishes between the natural and historical aspects of nations. After analyzing the subcategories of primordial nature, environmental nature, and historical nature, the paper shows how these layers are articulated by myth. Authority, in the contractual form of potlatch, signalizes the moment of transition to the true self-determination of nations. Miki Kiyoshi was one author who pointed out the problematic aspects of Kōsaka’s theory of nation. A comparison with Miki’s thought uncovers how authority is the main characteristic of Kōsaka’s view of myth. The paper finishes by investigating where this authority comes from. Since it cannot come from nature alone, it should also come from the past character of myth itself, which is an expression of what Kōsaka terms “the eternal now”
Symmetry, Integrability and Geometry: Methods and Applications Commutative Families of the Elliptic Macdonald Operator ⋆
No full textHoshino, Shiraishi, and Yanagida constructed two families of commuting operators which contain the Macdonald operator (commutative families of the Macdonald operator). They used the Ding–Iohara–Miki algebra and the trigonometric Feigin–Odesskii algebra. In the previous paper [arXiv:1301.4912], the present author constructed the elliptic Ding–Iohara– Miki algebra and the free field realization of the elliptic Macdonald operator. In this paper, we show that by using the elliptic Ding–Iohara–Miki algebra and the elliptic Feigin–Odesskii algebra, we can construct commutative families of the elliptic Macdonald operator. In Appendix, we will show a relation between the elliptic Macdonald operator and its kernel function by the free field realization. Key words: operator elliptic Ding–Iohara–Miki algebra; free field realization; elliptic Macdonal
Reliability, Efficiency and Cost Trade-offs for Medium Voltage Distribution Network Expansion using Refurbished AC-DC Reconfigurable Links
No full textThe role of MVDC links for distribution network expansion is important. The distribution network operators (DNOs) can maximize the power transfer capacity of existing grid infrastructure during (n-1] contingencies using reconfigurable parallel ac-dc architecture. In addition this concept involves a range of efficiency, reliability and economic trade-offs. The object of this paper is to present a discussion on the emerging choices involved in adopting a parallel ac-dc reconfigurable link architecture in designing future and flexible power grids.DC systems, Energy conversion & Storag
Revascularization Surgery for Pediatric Moyamoya Disease : Significance of Peri-operative Management to avoid Surgical Complication(<SPECIAL ISSUE>Problems of Pediatric Neurosurgery)
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