1.

論文(リポジトリ)

論文(リポジトリ)
Matsumoto, Shuichi ; 松本, 修一
出版情報: Ryukyu mathematical journal.  12  pp.37-51,  1999-12-30.  Department of Mathematical Sciences, Faculty of Science, University of the Ryukyus
URL: http://hdl.handle.net/20.500.12000/15167
概要: When we quantize a system consisting of a single particle, the proper time τ and the rest mass m are usually dealt with as parameters. In the present article, however, we introduce a new quantization rule by which these quantities are regarded as operators in addition to the position and the momentum. Applying this new rule to a scalar particle and to a particle with spin 1/2, we analyze the time evolution of the operator τ. In the former case, the evolution of the proper time perfectly matches several well-established classical formulae. In the case of the particle with spin 1/2, our new rule implies that an oscillation appears in the time evolution of the operator τ. This oscillation is similar to Zitterbewegung which is well-known in the ordinary Dirac theory. We formulate one physical effect of this oscillation by considering the interaction with a gravitational field, and estimate how small it is.
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2.

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Nishishiraho, Toshihiko ; 西白保, 敏彦
出版情報: Ryukyu mathematical journal.  12  pp.53-68,  1999-12-30.  Department of Mathematical Sciences, Faculty of Science, University of the Ryukyus
URL: http://hdl.handle.net/20.500.12000/15949
概要: Inverse problems for the degree of the best approximation are discussed in the general settings in Banach spaces and sev eral refined results are obtained. Furthermore, applications are provided from the viewpoint of Fourier expansions associated with projections on Banach spaces.
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3.

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Maeda, Takashi ; 前田, 高士
出版情報: Ryukyu mathematical journal.  12  pp.9-30,  1999-12-30.  Department of Mathematical Sciences, Faculty of Science, University of the Ryukyus
URL: http://hdl.handle.net/20.500.12000/16091
概要: The third component of the graded minimal free resolution of the third Veronese subring of three variables over a field k of characteristic zero, is proved to be decomposed into {741} 【○!+】 {732} 【○!+】 {651} 【○!+】 {642} 【○!+】 {633} 【○!+】 {552} 【○!+】 {543} 【○!×】 S(-4) as GL_3(k)-module, where {n, m, l} is the irreducible representation of GL_3(k) with the highest weight (n, m, l) and S is the polynomial ring of ten variables. They are expressed applying the symbolic method of ternary cubic forms in the classical invariant theory.
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4.

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Kinjo, Yoshiyuki ; Miyagi, Yashushi ; 金城, 義行
出版情報: Ryukyu mathematical journal.  12  pp.1-7,  1999-12-30.  Department of Mathematical Sciences, Faculty of Science, University of the Ryukyus
URL: http://hdl.handle.net/20.500.12000/16407
概要: We indicate that if a Hamiltonian system possesses a noncommutative Lie algebra of integrals defined on a 2n-dimensional manifold in the noncommutative sense and an annihilator is an ideal, the system is tangent to an n-dimensional manifold.
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5.

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Sudo, Takahiro ; 須藤, 隆洋
出版情報: Ryukyu mathematical journal.  12  pp.69-85,  1999-12-30.  Department of Mathematical Science, Faculty of Science, University of the Ryukyus
URL: http://hdl.handle.net/20.500.12000/24255
概要: This paper is devoted to the case by case study on structure of group C*-algebras of the Lie semi-direct products of the 1-dimensional real or complex Lie groups by connected Lie groups, in particular, by commutative Lie groups or the generalized Heisenberg Lie groups. As corollaries, we determine existence and nonexistence of projections of these special group C*-algebras in terms of groups, and obtain some generalized results for more general C* -algebras by another methods.
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6.

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Isomura, Minoru ; Ikegawa, Shiro ; Kinjo, Takao ; Takeuchi, Kumiko ; Yamane-Tanaka, Yuka ; Kitami, Kikuko ; Nakamura, Yusuke
出版情報: DNA Research.  6  pp.387-400,  1999-12-01.  Oxford University Press
URL: http://hdl.handle.net/20.500.12000/46345
概要: Large-scale sequencing of genomic regions and in silico gene trapping together represent a highly efficient and powerful approach for identifying novel genes. We performed megabase-level sequence analyses of two genomic regions on human chromosome 8p (8p11.2 and 8p22.→p21.3), after covering those segments with sequence-ready contigs composed of 74 cosmids, 14 BACs, and three PAC clones. We determined continuous nucleotide sequences of 1,856,753 bases on 8p11.2 and 1,210,381 bases on 8p22→p21.3 by combining the shotgun and primer-walking methods. In silico gene trapping identified four novel genes in the 8p11.2 region and, in the 8p22→p21.3 region, six known genes ( PRLTS, PCM1, MTMR7, HCAT2, HFREP-1 and PHP ) and three novel genes. The distribution of Alu and LINE1 repetitive elements and the densities of predicted exons were different in each region, and Alu -rich portions contained more exonic sequences than LINE1-rich areas.
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7.

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Saitou, Masatoshi ; Chinen, T ; Odo, Y
出版情報: Surface & Coatings Technology.  115  pp.282-284,  1999-07-18.  Elsevier Science S.A.
URL: http://hdl.handle.net/20.500.12000/391
概要: Two kinds of growth rate of nickel films prepared by electrodeposition were measured by use of columnar photoresists for med on indium-tin oxide (ITO) glass plates. The ratio of the mean growth rate at the edge to that of the nickel layer was 1.5, which indicates direct evidence for the Schwoebel effect [R.L. Schwoebel, J. Appl. Phys. 40 (1969) 614]; i.e., the presence of anisotropy between the up and down step incorporation probabilities of adatoms. The growth exponent of 0.3 was obtained from atomic force microscopy (AFM) images of the nickel film surface. This suggests that the nickel growth by electrodeposition has a dynamic scaling property.
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8.

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Kinjo, Akio ; Sakugawa, Choken ; Nakamura Nunez, Irma ; Uchihara, Toshio ; 宇地原, 敏夫
出版情報: 琉球大学理学部紀要 — Bulletin of the College of Science. University of the Ryukyus.  pp.23-30,  1999-11.  琉球大学理学部
URL: http://hdl.handle.net/20.500.12000/15051
概要: N-methylphenothiazine reacts with Fe(3) ion and reaches equilibrium in the anionic SDS micellar solution as reported by Minero et al. However, the reaction did not take place in the cationic DTAB, non-ionic Brij 35 micellar and waterethanol (1:1) solutions. In order to obtain more information about the effect of surface negative charge of micelle on the reaction, thermodynamic study of the reaction was carried out in SDS-hexanol mixed micellar solutions. The equilibrium constant decreases with increasing the concentration of hexanol in the mixed micellar solutions. Both free energy and enthalpy changes of the reaction shift in the positive direction with increasing the concentration of hexanol, reflecting the fact that the reaction becomes more difficult with increasing the concentration of hexanol. The entropy change seems independent of the concentration of hexnol.
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9.

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Yoshino, Tetsuo ; Kon, Takeshi ; Miura, Asami ; 吉野, 哲夫
出版情報: 琉球大学理学部紀要 — Bulletin of the College of Science. University of the Ryukyus.  pp.77-86,  1999-03.  琉球大学理学部
URL: http://hdl.handle.net/20.500.12000/15267
概要: Since Beryx mollis Abe, 1959 was described from Sagami Bay, Honshu Island, Japan, it has been regarded as a junior synon ym of B. splendens Lowe. Comparison of specimens of Beryx from Japan revealed that B. mollis is a valid species and distinguished from B. splendens in having the following characters: fewer dorsal fin rays (12-13 vs. 13-15); fewer pyloric caeca (15-20 vs. 27-36); deeper body (39.0-43.2 vs. 33.9-41.0 as % of SL); larger eyes (13.8-15.9 vs. 10.6-14.1 as % of SL); and longer pelvic fins (24.1-33.2 vs. 19.8-27.8 as % of SL); oval-shaped posterior nostril (vs. slit-like); stronger ctenoid scales. Known distribution of B. mollis is restricted to southern Japan from Sagami Bay to the Ryukyu Islands.
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10.

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Motoyama, Isao ; Nakamura, Mamoru ; Katao, Hiroshi ; Takaki, Yasuaki ; Nishida, Hideaki ; Kuno, Toshiyuki ; Morii, Yasuhiro ; Higa, Takeshi ; Nagai, Naoko ; Takei, Naoyuki ; Tanaka, Hitoshi ; 中村, 衛
出版情報: 琉球大学理学部紀要 — Bulletin of the College of Science. University of the Ryukyus.  pp.43-51,  1999-03.  琉球大学理学部
URL: http://hdl.handle.net/20.500.12000/15387
概要: Investigation of subbottom seismicity, grab sampling of surface sediments, and net sampling of planktonic organisms were carried out in the southern Okinawa Trough and off Miyako Island in November 1998. Four pop-up type ocean bottom seismographs (OBS) were settled on the seafloor of the southern Okinawa Trough to investigate subbottom seismicity of this area. All OBS' s were successfully retrieved after 4 days observation and numerous number of micro-earthquakes were recorded by them. Surface sediments collected from the island shelf and the adjacent slopes off the west coast of Miyako Island are composed mainly of bioclastic carbonate sand. Foraminifers occur dominantly in some samples and alive benthic organisms such as larger foraminifers, sponges, corals and molluscs were obtained from some samples. Neogene mudstone gravels were taken from the station on the fore-arc slope south of the island. Ten phyllosoma larvae of Palinurid lobster and Scyllarid lobster are collected by the large larval net (mouth diameter: 2.0 m) from the surface layer north of Iriomote Island. Each phyllosoma larva was kept in the 1 liter bottle, and they were transported to the laboratory to study the larval development.
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