799 research outputs found
Hyperfunctions with real analytic parameters and continuation of solutions of systems of partial differential equations
No full textAbstractThe purpose of this paper is to introduce a "sheaf" of hyperfunctions with Cω-parameters at the boundary, to study its behavior under the trace morphism, and to state some criteria on extension of solutions of systems of P.D.E. across singular sets of codimension ≥ 1. Let M be a Cω-manifold, X a complexification of M, Ω an open set with Cω-boundary N = ∂Ω, Y a complexilication of N, V a closed conic regular involutive submanifold of T*MX\ T*YX transversal to N × MT*MX with regular involutjve intersection. Let M be a DX-module for which Y is non-characteristic. We introduce a complex BaM | X = Ba, VM | X whose 0th cohomology consists of those hyperfunctions on M which depend real analytically on the variables transversal to the leaves of V. We also introduce a new complex BaΩ | X = Ba, VΩ | X whose main feature is that traces on N of H0(Ba, VΩ | X)-so1utions of M belong to H0(Ba, V′N | Y)). (Here V′ = ρω−1(V) with T*Y ← ρY × XT*X → ωT*X.) We are then able to state in Section 3 several principles on continuation of hyperfunction solutions with Cω-parameters (resp. real analytic solutions) to systems M across a subset S contained in a non-characteristic boundary N. The method (inspired by [Kan2]) consists in proving that under some hypotheses on non-microcharacteristicity of N, ΓΩ(H0(BaM | X))-solution f of M belongs automatically to H0(BaΩ | X) (Ω = Ω± denoting the components of M \ N), and therefore their traces γ ± (f) on N satisfy SSγ ± (f) ∩ V′ = Ø. The extendability of f across S is then an immediate consequence of the propagation 0 for γ+ (f) − γ−(f) from N \ S up to N
Data on in vivo phenotypes of GFRα1-positive spermatogonia stimulated by interstitial GDNF signals in mouse testes
No full textAbstractThis article contains the data related to the research article “in vivo dynamics of GFRα1-positive spermatogonia stimulated by GDNF signals using a bead transplantation assay” (Uchida et al., 2016) [1]. A novel transplantation assay of growth factor-soaked beads into the mammalian testicular interstitium was developed, in order to examine the effects of various soluble factors on in vivo dynamics of the spermatogonia including spermatogonial stem cells (SSC). Here we provide the image data of GFRα1-positive stem/progenitor spermatogonia in mouse seminiferous tubules near the beads soaked in GDNF (glial cell-derived neurotrophic factor), one of the SSC niche factors. The data provide various phenotypes of GFRα1-positive spermatogonia induced by bead-derived GDNF signals, which are useful to understand the active state of GFRα1-positive stem/progenitor spermatogonia in vivo
Pre-seismic ionospheric anomalies detected before the 2016 Taiwan earthquake
No full textCorresponding Author : Ken UmenoShin‐itiro Goto, Ryoma Uchida, Kiyoshi Igarashi, Chia‐Hung Chen, Minghui Kao and Ken Umeno (2019). Pre‐seismic ionospheric anomalies detected before the 2016 Taiwan earthquake. Journal of Geophysical Research: Space Physics. https://doi.org/10.1029/2019JA02664
English Re-education (2)
No full textThe author introduced some of his plans to improve the English re-education for his students in engineering majors (Uchida, 2004). To realize one of the plans, he took some of his students to Australia to join a two-week English study program at Southern Cross University (SCU). This article provides an overview of the program and what he observed by experiencing a homestay.departmental bulletin pape
Provincializing Empire
No full textProvincializing Empire explores the global history of Japanese expansion through a regional lens. It rethinks the nation-centered geography and chronology of empire by uncovering the pivotal role of expeditionary merchants from Ōmi (present-day Shiga Prefecture) and their modern successors. Tracing their lives from the early modern era, and writing them into the global histories of empire, diaspora, and capitalism, Jun Uchida offers an innovative analysis of expansion through a story previously untold: how the nation’s provincials built on their traditions to create a transpacific diaspora that stretched from Seoul to Vancouver, while helping shape the modern world of transoceanic exchange.
“Provincializing Empire offers a stimulating and persuasive account of the longue durée of Japanese capitalist development, connecting Japanese historiography to important conversations on the history of racial capitalism and geographies of space, place, and scale.” — DAVID AMBARAS, author of Japan’s Imperial Underworlds: Intimate Encounters at the Borders of Empire
“Wide-ranging yet richly documented, Provincializing Empire offers a powerful new transregional history of Japanese capitalism, challenging claims about the developmental state. It tells the fascinating story of a merchant diaspora whose growth was entwined with Japanese imperialism, and of the invented traditions that sustained provincial identity amid global commercial expansion.” — JORDAN SAND, author of Tokyo Vernacular: Common Spaces, Local Histories, Found Objects
""A tour de force! Jun Uchida's lucid narrative illuminates the multidirectional movements of settler-migrant merchants from peripheral Japan that cut across the prescribed borders of empires and nation-states. Empirically rich and theoretically sophisticated, Provincializing Empire calls into question many assumptions about Japanese imperialism and offers a less spatially bounded story of grassroots expansionism."" — EIICHIRO AZUMA, author of In Search of Our Frontier: Japanese America and Settler Colonialism in the Construction of Japan's Borderless Empire
""Provincializing Empire is a wonderfully creative model for connecting local and global history. Uchida frames her stimulating account of Japanese overseas commercial expansion, colonialism, and diaspora not as the top-down story of state policy but as the local history of a mercantile community."" — DAVID L. HOWELL, Robert K. and Dale J. Weary Professor of Japanese History, Harvard University
Global Solvably Closed Anabelian Geometry
No full textIn this paper, we study the pro-Σ anabelian geometry of hyperbolic curves, where Σ is a nonempty set of prime numbers, over Galois groups of “solvably closed extensions” of number fields — i.e., infinite extensions of number fields which have no nontrivial abelian extensions. The main results of this paper are, in essence, immediate corollaries of the following three ingredients: (a) classical results concerning the structure of Galois groups of number fields; (b) an anabelian result of Uchida concerning Galois groups of solvably closed extensions of number fields; (c) a previous result of the author concerning the pro-Σ anabelian geometry of hyperbolic curves over nonarchimedean local fields.</p
Office staff, Co-op
No full textThe photograph is of the co-op staff before or after its banquet at the Bank Hotel in Delta, Utah. Emil Sekerak is in the middle, wearing dark glasses. Next to him with the bow tie is Dwight Uchida, author Yoshiko Uchida\u27s father. Mr. Kanzaki from San Francisco is in the photo but it is not clear which man he is
The Concepts of Independence and Civilization in Yu Kilchun's Segye Taese-Ron 世界大勢論 Comparison with Uchida Masao's Yochi shiryaku 輿地誌略
No full textYu Kilchun 兪吉濬, who studied at Keio Gijuku from 1881 to 1882 as the first Korean student in Japan, wrote the Segye Taese-ron 世界大勢論 (on the world situation), an introduction to world geography and Western civilization in 1883. In this paper, the author elucidates the fact that Yu used the Yochi Shiryaku 輿地誌略 (12 vols.) of Uchida Masao 内田正雄, especially the general introduction (vol. 1) as a source. On the basis of a comparison of the two works, the author points out the following three points. First, Uchida had described Korea as a dependent state of imperial China, but Yu described Korea on the contrary as an independent state, but did not deny the fact that Korea was a tributary state of imperial China. Yu later argued in his main work, Soyu Kyonmun 西遊見聞, in 1889 that Korea was an independent state in international law, though a tributary state of imperial China. Second, in the Segye Taese-ron, Yu argued that Korea could accept Western technology, but must not accept Christianity and Western political systems. Thus, he did not translate most of the content about religion and political systems of the Yochi Shiryaku. Third, in order to emphasize the independence of Korea and individual character of Korean culture in distinction from Chinese culture, Yu emphasized the superiority of kungmun 國文 (Hangul) over Chinese characters and did not use the era name of the Qing dynasty, but used the kaeguk kinyon 開國紀年 (counting years from 1392, the first year of the Choson dynasty, established by Yi Songgye)
Theory of magnon-driven spin Seebeck effect
No full textThe spin Seebeck effect is a spin-motive force generated by a temperature gradient in a ferromagnet that can be detected via normal metal contacts through the inverse spin Hall effect [K. Uchida et al., Nature (London) 455, 778 (2008)]. We explain this effect by spin pumping at the contact that is proportional to the spin-mixing conductance of the interface, the inverse of a temperature-dependent magnetic coherence volume, and the difference between the magnon temperature in the ferromagnet and the electron temperature in the normal metal [D. J. Sanders and D. Walton, Phys. Rev. B 15, 1489 (1977)].Kavli Institute of NanoscienceApplied Science
Observation of spectral narrowing and emission energy shift in organic electroluminescent diode utilizing 8-hydroxyquinoline aluminum/aromatic diamine multilayer structure
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yutaka Ohmori, Akihiko Fujii, Masao Uchida, Chikayoshi Morishima, and Katsumi Yoshino, Appl. Phys. Lett. 63, 1871 (1993) and may be found at https://doi.org/10.1063/1.110632.Organic electroluminescent (EL) diode with a multilayer structure which consists of alternating layers of organic 8‐hydroxyquinoline aluminum (Alq3) and aromatic diamine has been grown by organic molecular beam deposition. The EL emission from the multilayer structure shows spectral narrowing and the emission energy has been observed to shift to higher energy compared with that in the monolayer structure. Mechanism of spectral narrowing and the emission energy shift in the diode with the multilayer structure have been discussed
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