Acta Medica Okayama
1988
Test of QED through the reactions e+ e- → e+ e- and e+ e- →γ γ at TRISTAN
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1989
海底火山活動に伴って出現する変色水の研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1990
Morphology and Magnetic Properties of Iron Fine Particles
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1990
Neurophysiological study of crayfish visual system
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1990
低親和性 IgE 受容体 (FCεR U) 陽性リンパ球の解析に関する研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1990
担子菌ウシグソヒトヨタケにおける倍数性の研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1991
Structural and functional alanalyses of the genes on the invertible DNA segments in intact and defective bacteriophages
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1991
Neurobiological Study of the Reproductive Organs in Crickets (Gryllus bimaculatus)
EN
Kouji
Yasuyama
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1991
リンをドープしたn型シリコン中に化学エッチングによって導入される欠陥
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1991
イトマキヒトデ (Asterina pectinifera) の生殖細胞に関する研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
水素移動 (H-,H+移動) を伴う液相中での反応の速度論的,並びに平衝論的研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
The lead, strontium and neodymium isotopic studies on the Quaternary volcanic rocks from northeastern Japan: implications for the slab-mantle interaction in subduction zone.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
X線共鳴交換散乱による強磁性 Nd2 Fe14 B 化合物の研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
Expression in Escherichia coli K-12 of the human TNF (tumor necrosis factor) and PSTI (pancreatic secretory trypsin inhibitor) genes: Effect of in vitro mutagenesis around the initiation codon and in the 5' coding region.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
遮蔽クーロンポテンシャルの束縛状態に対する相対論的WKB法
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
Neurophysiological study of the glutamate receptors in the mammalian brain.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
Neural basis of rhythmic movements in insects.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
Neurophysiological study of the cercus-to-giant interneuron system in the cricket.
EN
Kiyonori
Hirota
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
液体流れ系を用いる陰イオン性物質の高感度分析に関する研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
潮汐に同調した生物リズムの季節変動に関する研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
On the origin of magnetite-series granitoids in the terrane of ilmenite-series grantoids, with special reference to some granitoids in the San'yo belt, Southwest Japan.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
LASER MICROPROBE ANALYSIS OF CARBON DIOXIDE AND WATER IN GLASS INCLUSION: AN ATTEMPT TO DETERMINE THEIR CONCENTRATIONS IN PRE-ERUPTIVE MAGMA
EN
Genji
Saito
Volatile materials dissolved in magmlas play an important role in the evolution of magmas and volcanic eruptions. During magma ascent, the magma may be saturated with the volatiles because of decrease in solubilities of the volatiles in silicate melts with pressure. Formation of a gas phase would lead to decrease in the bulk density of magma and thereby accelerate the magma ascent. Expansion of the resulting gas phase may induce a volcanic eruption. The major volatile components in a nlagma are H(2)0, C0(2), S and Cl. Glass inclusions in phenocrysts are the most suitable samples for measuring volatile concentrations in pre-eruptive magmas. However, it has been difficult to measure the H(2)0 and CO(2) concentrations in glass inclusions, mainly because the size of the glass inclusions is very small (50-200 μm) and the sensitivity of analytical methods is not sufficient. In this study, we have developed a laser microprobe technique for determining a minute amount of H(2)0 and C0(2) dissolved in glass inclusions. The analytical system consisting of a Nd-YAG laser for selective heating of glass inclusions and a gas chromatograph-mass spectrometer for measuring a micro quantity of H(2)0 and C0(2) dissolved in glass inclusions. The H(2)0 and C0(2) were extracted from glass inclusions by laser heating under a vacuum. The extracted gas was collected in a cold trap and then introduced to GCMS by carrier gas. Gas concentration was calculated from the absolute amount of the extracted gas and the mass of glass melted. The optimum working conditions (lamp current, pulse frequency and shooting duration) of laser extraction were decided using a basaltic glass sample. A glass sample ground to less than 100 μm thick was pierced by a laser beam and measured for diameter of the hole produced to obtain the accurate determination of the volume of the glass melted. The mass of the melted glass was calculated from its volume and density. Efforts were made for reduction of background level of C0(2) and H(2)0. High purity helium carrier gas was farther purified with cold traps to remove C0(2) and H(2)0 contained in the carrier gas. Analytical line was thoroughly baked out at 300℃ before the analyses. With these procedures, the blank C0(2) was reduced to less than 0.07 ng and the blank H(2)0 to less than 6 ng. The detection limit of the present system was found to be 0.15 ng C0(2) and 15 ng H(2)0, considering the confidence limit of the calibration. The repeated analyses of C0(2) in basaltic glass indicate that the present technique allows us to analyze C0(2) concentration of glass inclusions as small as 70 μm in diameter within an accuracy of ±60 ppm, assuming that the glass inclusion contains 300 ppm C0(2). The H(2)0 analyses of the glass by the present technique gave significantly lower H(2)0 concentration than the bulk analysis, suggesting incomplete degassing of H(2)0 from molten glass during laser irradiation due probably to its slow diffusion rate. The glass inclusion samples from Killauea volcano, Hawaii, and Izu-Oshima volcano, Japan, were analyzed to determine CO(2) concentrations of pre-eruptive magma. The C0(2) concentration of pre-eruptive magma in South-West Rift Zone of Kilauea volcano was 230 ppm. This suggests that the magma has been significantly degassed during its storage in the summit magma chamber and migration to the rift system. The depth of the magma chamber was estimated to be 2.8-4.0 km from the C0(2) concentration of the pre-eruptive magma, in good agreement with the geophysical estimation. Comparison of the volatile budget of Kilauea volcano based on the C0(2) analysis of glass inclusion with the observed C0(2) flux suggests that parental magma contains 3000 ppm C0(2). The bulk density of magma containing exsolved gases is not snlall enough to ascend to the surface by its own buoyancy. This is consistent with the present settings of the Kilauean magma; the sumrnit magma chamber and rift magma system extending from the summit caldera. The C0(2) concentration of pre-eruptive magma of Izu-Oshima volcano was found to be 1 70 ppm. The measured C0(2) concentration indicates that the magma chamber exists at a depth of about 2 km beneath the volcano. At this depth, the magma should be saturated with C0(2). The estimated bulk densities of the magma (d=2.4-2.6 g/c㎥) containing C0(2)-rich gas phase are consistent with the density structure of the volcano, if the magma before degassing contains C0(2) more than 1700 ppm. The rate of magma supply was estimated from the C0(2) concentration of pre-eruptive magma and C0(2) fluxes based on measurements on surface volcanic gases. Assuming the primary magma contains 2500 ppm C0(2), the estimated rate of magma supply(6-19x 10(3) tons/day) is compatible with the observed rate of magma supply based on the total mass of ejecta of major eruptions during the last 1500 years.
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
Light-regulated translation and some post-translational events in the organization of Dl subunit in photosystem U reaction Center.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
Neuroethological study of the Reproductive Behavior in the Male Cricket Gryllus bimaculatus DeGeer.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
The gene encoding murine serum amyloid P-component and its expression between inbred strains of mice
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1992
Egg polarity of starfish : the determinant for archenteron farmation localzing at the vegetal pole of the egg.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
金属 (Pd,Mn) -シリコン接合界面形成と電子状態
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
MULTIPLE-CASE DISAGNOSTICS IN MULTIVARIATE METHODS
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
Central organization of the emetic act in decerebrate dogs
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
Fe-基インパー合金のX線散漫散乱による研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
Genetical, pharmacological and molecular studies on ketamine responses of the nematode Caenorhabdittis elegans
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
Morphological and pharmacological studies on experimental pituitary hemorrhage in mice
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
Comparative study of Pigment-Dispersing Hormone immunoreactive neurons in the insect nenrvous system
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
Development of strontium isotopic analysis for Mg-rich samples and the Rb-Sr and Sm-Nd isotope systematics in the Horoman peridotite complex, Hokkaido, Japan.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
磁場中格子上の準2次元電子系における密度波状態
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
単体ボヤにおける生殖細胞に関する研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
強磁場下における水素分子イオンH2+の状態
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1993
低磁場におけるスピン緩和現象の理論的研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
Structure of rings satisfying certain constraints and commutativity theorems.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
Structure of rings satisfying certain conditions
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
磁性体における非平衡・非線形現象の研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
Behavioral Studies on the Color Vision in Goldfish
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
Crystallographic Study of Solid-State Photodimerization of Cinnamamide and α-(Acetylamino) cinnamic Acid Dihydrate
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
TOPOLOGY OF EXCEPTIONAL LIE GROUPS AND CERTAIN SPECTRA CONCERNING BP-THEORY
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
染料陽イオンとのイオン会合反応に基づく陰イオン性物質の分離・分析に関する研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
アモルファス強磁性合金のイオン照射による磁気特性の変化
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
DMSO-SbCl5(1:1) 錯体および関連錯体による二,三の含酸素化合物とチオール類の酸化
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
珪酸塩鉱物のT-Oフレームと陽イオンの相互関係 関連したアルカリ銅珪酸塩の結晶化学的特異性
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
燐酸塩鉱物の結晶構造の生成条件への依存性―それに関連した構造の系統化の研究―
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
STUDIES ON TRANSPORT OF THE NUCLEUS-ENCODED 30 kDa PROTEIN OF PHOTOSYSTEM U INTO EUGLENA CHLOROPLASTS
EN
Junko
Inagaki
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1994
Fluid Geochemistry of CO'2-rich Lakes and Soda Springs along the Cameroon Volcanic Line, Cameroon.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
Synthetic Studies on Phospha-Sugars. D-Glucose and D-Galactose Analogs
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
Development of lithium isotopic analysis and its application to the geochemistry of oceanic crust and island arc volcanics
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
Control System of Compensatory Eye Movements in the Crayfish
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
Functional role of neurosecretory cells in the mechanical activity of the reproductive organs in the crlcket (Grllus bimaculatus)
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
軟X線放出分光法による金属シリサイド/Si接合系に関する研究 金属シリサイド価電子帯構造,および薄膜形成機構の解明
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
ON ESTIMATING DENSITY AND DISTRIBUTI0N FUNCTI0NS UNDER SOME CONSTRAINTS
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
The role of the cytoskeleton in conjugate division and tip growth inthedikaryon of Coprinus cinereus
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
Frenkel-Kontorova 模型に関する統計力学的研究 1次元超イオン導電体への応用
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
Studies on Synthesis and Chemistry of Benzene-Arene Biplanemers
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
Tectonism, metamorphism and plutonism of the Ryoke belt in the Ina district, Central Japan.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
Morphological and pharmacological studies on the pars intermedia of the mouse pituitary gland.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1995
Studies on the photoinhibition of photosystem U in chloroplasts Degradation and cross-linking of polypeptides in photosystem U
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Regulation of Stoichiometry between Photosystem T and photosystem U in Cyanophyte by Redox-state of photosynthetic Electron Transport System
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Neural mechanism of thanatosis in the cricket
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
β-ZnP2における励起子ポラリトンの緩和過程に関する研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
ワイラケ沸石の秩序-無秩序構造とその組成及び産状
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Neurophysiological study of behavioral initiation and motor program selection in the cricket
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Structure of finite rings and certain infinite rings with prime-power characteristic
EN
Takao
Sumiyama
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Experimental study on the slab-mantle interactions in subduction zone and its implications for the material recycling through the subduction zones.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Physiological and Genetic Studies of Light-Induced Phase Shifting of The Circadian Conidiation Rhythm in Neurospora crassa.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
X-ray and Dielectric Studies of Ferrielastic Phase Transition
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
A high-pressure experimental study on an olivine lamproite : application to its petrogenesis.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Study on local electronic and magnetic structures by means of magnetic XAFS
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Molecular cloning,expression and mutation analysis of the ryanodine receptor gene ryr-1 of Caenorhabditis elegans
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Studies on X-ray-induced apoptosis in cultured mammalian cells
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Molecular phylogenetic studies of the Mesozoa and the Platyhelminthes
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
磁場破壊による量子干渉と相転移現象
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Translational regulation in the synthesis of D1 protein in photosystem U reaction center.
EN
Hiroshi
Kuroda
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Morphological and Physiological Studies of the Abdominal Muscles of the Cricket,Gryllus bimaculatus, with Special Reference to Synaptic Function
EN
Fumiko
Kawasaki
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Structure-Function Relationships in the Photosystem U Reaction Center Analyzed by in vitro Random Mutagenesis of psbA Gene in Synechocystis sp.PCC6803.Synechocystis sp.
EN
Yoshihiro
Narusaka
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Molecular analysis of acriflavine resistance in Neurospora crassa
EN
Masashi
Akiyama
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1996
Assembly of photosynthetic oxygen- evolving complex subunits in higher plants:sites of assembly and mechanism of binding
EN
Akiko
Hashimoto
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
Mechanism for Deletion Formation Depending on Direct Repeats between Homeologous Sequences and between Nonhomologous Sequences:Involvement of the Escherichia coli Single- Stranded DNA-Binding Protein(SSB)
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
Cloning and Characterization of Flagellar Operons of the Four Shigella Subgroups:Genetic Defects that caused Flagella Loss of the Subgroups
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
Steric Control of Polynuclear Manganese Complexes by the Use of Tripodal Tetradentate Ligands
EN
Masakazu
Hirotsu
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
Self-Dual Codes, Designs and Unimodular Lattices
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
Transcriptional Regulation and DNA- Protein Interaction in Gene Expression in Arabidopsis thaliana
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
Studies of spontaneous and evoked neurotransmitter release at verte- brate and invertebrate neuromuscular junctions from the viewpoint of the mechanism for release
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
追尾機能と電磁石スペクトロメータを備えた粒子望遠鏡の作製とシグナスX-3由来のミューオン観測
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
Neural representation of wind information in the nonspiking local interneurons of the cockroach cercal system
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
Molecular Organization in the Photo- system U Reaction Center
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
Infinite Galois Theory of Semisimple Rings
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
ビスマス置換磁性ガーネット単結晶における、磁区形成機構の研究と光磁界センサへの応用
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
コバルト燐酸塩の結晶構造とその特異性
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1997
アルカリマグネシウムモノ燐酸塩の結晶構造と生成条件
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
On the sizes of k-arcs, (k,r)-arcs, t-blocking sets and caps in finite projective spaces
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Thin Films Growth with Positive and Negative Ion Beams Deposition
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
EXAFS Study on Local Structure in γ-CuBr and γ-Cul
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Si基板上への MnSix形成とその接合系の評価
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Inhibitory mechanism of mating behavior in the male cricket
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Genetic analysis of the effects of calmodulin antagonists on the circadian conidiation rhythm in Neurospora crassa
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
STATISTICAL ANALYSIS OF INCOMPLETE DATA AND STATISTICAL GRAPHICS
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Genetic analysis of the circadian clock in biochemical mutants of Neurospora crassa
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Photoemission study of metal-silicon system and annealed 6H-SiC surfaces
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
DATA ANALYSIS SYSTEM INCLUDING DATA DICTIONARY
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Physiological roles of growth factors on the cell proliferation of the mouse anterior pituitary cells.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
トリス(1,10-フェナントロリン)ケイ素(IV)錯体の分割機構
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
希土類化合物におけるL吸収端磁気円二色性の理論的研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Molecular analysis of fruit-body development in Coprinus cinereus
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
重心エネルギー58GeVでの電子・陽電子消滅反応におけるbクォークと軽クォーク事象の荷電多重度の測定
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Disordered ground state and domain- wall excitations in one-dimensional quantum antiferromagnets
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Synthetic Studies on Phospha-sugars: 6-Amino-6-deoxy-D-glucose and D- Mannosamine Analogs
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Mechanism of substrate-recognition- by a protease in the carboxy1- terminal processing of precursor D1 protein in photosystem II.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
Study on Nonlinearly Coupled Photon-Magnon System in YIG
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1998
岡山粒子望遠鏡による海面位での大気宇宙線ミューオンの全方位測定
EN
宇宙空間から地球に入射する放射線のことを宇宙線と呼ぶ。この宇宙線は,地球に入射する1次宇宙線とそれが大気圏内の原子核と相互作用して生み出された2次宇宙線との2つに大別される。1次宇宙線は約90%が陽子,9%がα線である。これら1次宇宙線が大気に入射すると大気中の陽子,あるいは中性子と強い相互作用を起し主に多数のπ(パイ)中間子が発生する。そのうち中性のπ(0)は2つのγ線に崩壊し,さらにこのγ線は対生成を起しe(-)(電子)とe(+)(陽電子)を生成する。また電荷を帯びたπ(+),π(-)中間子は,μ粒子(ミューオン)とυμ(ミューオン・ニュートリノ)に崩壊する。μ粒子はレプトンなので大気の核子と強い相互作用はしない。また,μ粒子はe(電子または陽電子)とυe(エレクトロン・ニュートリノ)とυμに崩壊するがπ中間子に比べ寿命が長いため,地表に到達する2次宇宙線の約70%がμ粒子である。1950年代から1980年代にかけてμ粒子の強度,および電荷比の理論的,実験的研究がなされてきた。これによりμ粒子の生成に関与したπ中間子やK中間子の割合を求めることができる。さらに,これから1次宇宙線のエネルギースペクトルや1次宇宙線が大気と相互作用するプロセスを導き出すことができる。また天体宇宙物理学的見地からは,地表にどの程度μ粒子が降り注いでいるかを知っておくことは必要である。最近では,ニュートリノ・フラックスの理論的計算を確かめるためにμ粒子のエネルギースペクトル及び電荷比がきわめて重要な指標となっている。というのは,最近のニュートリノ地下実験の報告によると,地下実験のニュートリノの観測値とニュートリノフラックスの理論計算に大きなずれが生じているためである。この意味においても十分な精度のミューオン強度の地上観測結果が要求される。理論的には全天頂角方向から到来するμ粒子のエネルギースペクトルが計算されているにも関わらず,実験では主に鉛直近辺と大天頂角近辺(75°〜90°)しか報告されていない。これは,巨大なμ粒子観測装置を垂直か水平に設置することは比較的容易であるが,いろいろな方向に向けることは難しいからである。これに対して,任意の方向からのμ粒子を観測できる宇宙線検出器「岡山粒子望遠鏡」の設計,建設,観測を行なった。「岡山粒子望遠鏡j は,サーボ・モータ・システムIこよる経緯儀になっており,コンピュータ制御により任意の方位角,天頂角に検出器を向けることができる。この機能は大気μ粒子の全方位測定に対して非常に有用である。さらに入射荷電粒子の電荷符号の判別,運動量の測定が可能である。本論文では,この「岡山粒子望遠鏡」を用いて天頂角毎の測定と方位角毎の測定を行い,大気μ粒子の全方位測定結果を示した。天頂角0°から81°までから到来するμ粒子を観測し,観測期間1992年から1996年,及び運動量領域1.5GeV/cから250GeV/cのデータを天頂角別に解析し,μ粒子の強度分布,電荷比(charge ratio)を運動量の関数として求めた。天頂角0°から81°まで2°刻み連続的なμ粒子強度分布はこれまで未測定であったが,本論文に示すように中間角度領域ではμ粒子強度に特異性がないことを示した。これによって,これまでに測定された狭い天頂角領域での実験や理論計算の結果を検討することが可能になり,本論文とのよい一致を見た。この一致は,理論の前提が示す全天頂角領域に対し,運動量領域1.5GeV/cから250GeV/cの範囲で,ミューオンがほとんどπ中間子からの崩壊の寄与に依存していること,K中間子の寄与は無視してよいことの恨拠を与えた。このことは1次宇宙線と空気核衝突においてK中間子が関与するような特異な反応は生じていないことを示すとともに,大気ニュートリノ・フラックスを推定する際にπ→ μυμのプロセスのみを扱えばよいことも示している。方位角毎のμ粒子測定に関しては,天頂角5°,20°,40°に対し8方位角方向を観測し,観測期間1997年から1998年までのデータを解析用に採用した。運動量領域に関して2.5GeV/cから3.5GeV/c(低運動量領域),3.5GeV/cから100GeV/c(高運動量領域)までの2領域に分け,電荷別,方位角方向別にこれらのデータを解析した。この結果,低運動量領域において,特定の方位角領域でμ粒子強度が減少した。これは,地磁気の影響のために,特定の方位角方向からのμ粒子の通過距離が延び,μ粒子が電子及び2種のニュートリノに崩壊するためである。大気ニュートリノは,μ粒子の生成(A:μ粒子強度の天頂角依存性),崩壊過程(B:電荷別μ粒子強度の方位角依存性)に1対1に対応するので, μ粒子のフラックスを求めることは,大気ニュートリノ・フラックスを求めることに対応する。このととを確証するために,本論文での解析A,Bからニュートリノエネルギーにして1GeVの,大気電子ニュートリノ,大気反電子ニュートリノ・フラックスを求め,相対変化の割合が数%であることを得た。さらに,海面位で,天頂角5°,1GeVの各々の大気ニュートリノ・フラックス比を求め,電子・反電子ニュートリノ,ミューオン・反ミューオンニュートリノ,ミューオン・電子ニュートリノ比それぞれ,1.23,1.02,2.26を得た。これらの比は,理論的に予想されるもの(それぞれ,1.24,1.04,2.48)に近い値であり,岡山粒子望遠鏡で大気二ユートリノ・フラックスを求めることができることを示した。
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
3d遷移金属化合物の電子状態に関するX線分光学的研究
EN
3d遷移金属(3d-TM)化合物におけるK-吸収端のX線近吸収端構造(XANES)およびX線磁気円二色性(XMCD)を利用して3d-TMの電子状態および磁気状態について調べた.このX線吸収分光法の特長を活かすことによって,3d-TM化合物の多様な磁気的性質を電子状態の観点から考察した.3d-TMイオンおよび配位子を変化させたときの3d-TMおよび酸素のK-吸収端XANESスペクトルの系統的な変化から,吸収端近傍の構造はTMイオンの3d電子状態を強く反映していることを見出した.スピネル型フェライトMFe(2)0(4)(M=Cr〜Cu)におけるXMCDの系統的な変化から,サイトによる寄与を分離した.また,金属性Fe化合物のXMCDでは配位子からの電荷移動によるFeの電子配置の変化を議論した.さらに,K-吸収端に対する磁気光学総和則の適用によって,4p軌道磁気モーメントを求め,酸化物と金属性化合物では互いに反対符号を持つことが明らになった.XMCDスペクトル中に観測される多電子励起(MEE)シグナルに対する系統的な変化から,MEEの特徴を捉えることによってその機構の解明を行った.エネルギー位置,強度,幅等の特徴からshake-up過程に付随する3p→4p単極遷移は否定され,終状態が(1s)(1)(3p)(5)(3d)(n+2)で表されるsuper Coster-Kronig遷移であることを提案し,実験的にそれを立証した.X線吸収分光法を利用して電子状態を議論するためには,エネルギ一分解能および統計精度の点で第三世代放射光の利用が適している.そこでSPring-8 BL39XUにおいて透過型移相子とピエゾ素子およびロックイン検出法の組み合わせによる「偏光変調法」XMCD測定を確立した.エネルギー分解能および統計精度に格段の向上が得られ, XMCDスペクトルに新たな微細構造が観測された.これによって,電子状態や磁気状態の詳細を議論することが可能となる.
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
Homotopy field name="type"s and Homotopy classes of Self maps
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
Group completion for multi H-maps and higher υn torsion in Lie groups
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
Galois theory for noncommutative rings and actions of pointed Hopf algebras
EN
Tadashi
Yanai
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
GROWTH CURVE ANALYSIS AND ITS RECENT IMPLICATIONS
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
銅イオン交換したhigh-silicaゼオライトの気体吸着特性と銅イオン種の状態
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
Vortex structure in anisotropic and quantum-limit superconductors
EN
Nobuhiko
Hayashi
Electronic structure of a single vortex (or vortex core structure) in type-II superconductors is theoretically discussed in the present thesis. Low-lying excited states in the superconductors due to the vortex, i.e., "vortex bound states," are examined in detail on the basis of numerical calculations. Two points are focused on: the effect of superconducting gap anisotropy on a vortex (Chapter 2) and the property of a vortex in quantum-limit situation (Chapter 3). The anisotropy of a superconducting energy gap has substantial effects on the structure of the vortex bound states. The local density of states around a vortex is calculated in a clean superconductor with the gap anisotropy within the framework of the quasiclassical theory of superconductivity. A characteristic structure of the local density of states, observed experimentally in the layered hexagonal superconductor 2H-NbSe(2) by scanning tunneling microscopy (STM), is well reproduced by assuming an anisotropic s-wave gap. The local density of states (or the bound states) around a vortex in superconductors with gap anisotropy is interpreted in terms of quasiparticle trajectories to facilitate an understanding of the rich electronic structure observed in STM experiments. This reveals not only a rich internal electronic structure associated with a vortex core, but also unique ability of the STM spectroscopy. The quantum limit means that the superconducting coherence length is small in the limit, i.e., it is comparable to the atomic length order. Focusing on quantum-limit behavior, fundamental structure of a vortex is studied by self-consistently solving the Bogoliubov-de Gennes equation. The discreteness of the energy levels of the vortex bound states is crucial for the vortex structure in the quantum limit. The following are revealed by the study of the quantum limit. The vortex core radius shrinks monotonically up to an atomic-scale length on
lowering the temperature T, and the shrinkage stops to saturate at a lower T. The pair potential, supercurrent, and local density of states around the vortex exhibit Friedel-like oscillations. The local density of states inside a vortex core generally has particle-hole asymmetry induced by the existence of the vortex itself. Some essential properties of general vortices which are concealed within the conventional non-quantum-limit analysis can be extracted by the quantum-limit analysis. On the basis of the inherent particle-hole asymmetry inside vortex cores, it is discussed in this thesis that electric charging of a vortex core is originated from the Friedel oscillation of the Bogoliubov wave functions around the vortex (Chapter 4) . This mechanism of the vortex core charging is independent of the slope in the normal-state density of states at the Fermi level. The temperature dependence of the vortex core charge is also presented. It is expected that by using STM, information on the vortex core charging is extracted through a relation between the vortex core charge and the vortex bound states.
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
Advanced Chemical Analyses for Nitrogen, Phosphorus and Sulfur Compounds Using Flow-Injection Spectrophotometry
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
Genesis of eclogites associated with peridotites in the Bohemian Massif
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
3/4filledバンドを有する擬2次元有機伝導体の低温構造と絶縁相
EN
本研究では,有機分子BEDT-TTFからなる有機伝導体のうち,バンドが3/4filledであり,2次元的なフェルミ面を持ちながら低温で非金属状態となる物質を含む2タイプの結晶構造に関してX線回折の手法により実験をおこない,電子状態の研究を行った.κ型結晶κ-(BEDT-TTF)(2)Cu[N(CN))(2)]X[X =Cl, Br]では,BEDT-TFF分子の2量体(ダイマー)化によってバンドが分裂し,伝導バンドは実効的に1/2 filledと見なせる.これまで提案されてきた"ダイマーモデル"では,ダイマーを1サイトと考え,ダイマー上のon site Coulomb反発U(eff)が2量体化の程度に左右され,系がMott絶縁体となるか否かはU(eff)と伝導バンドの幅W(u)との比で決定されるとしていたが,構造的な証拠が存在しなかった.X=Cl, Brの水素(h8)体,重水素置換(d8) 体について低温で精密結晶構造解析をおこない,"ダイマーモデル"が系統的に成り立つかを研究した.この結果,結晶構造の温度変化が大きく,低温構造が本質的に重要であることが明らかになった.つまり,低温で反強磁性体となるととが知られているCl塩では構造不安定性が小さく順調に格子が熱収縮し,低温でダイマー性が強くなる.これに対し,低温で金属から超伝導体になるBr塩では,2種類の構造変化が200〜220K近辺,80K付近で生じる.前者ではきわめて弱い2c周期の変調構造が陰イオン間の相互作用により形成されるが,層間のカップリングが弱く2次元的な秩序に留まる.BEDT-TTF分子にはほとんど影響がなく電子状態への影響は小さい.しかし,80Kでは陰イオンとBEDT-TTFのフラストレーションにより,BEDT-TTFにも配置の変化が起こりon site Coulomb反発U(eff)の程度に影響を与える.この2種類の変化は独立であり,そのいずれもが,これまでの予想とは異なり,BEDT-TTF終端のエチレン基の配向度とは直接関連していない.今回,低温で得られた原子座標と既存の原子座標とを用いてバンド計算をおこない比較した結果,(1)h8体のBr塩を除き,絶縁体から金属まで,低温構造から見積もられるU(eff)/Wで整理され,ダイマーモデルで理解できること,(2)Cl塩とBr塩とではハロゲン原子の置換が80Kの構造変化の有無をひき起こし, 80K以下で2量体化の程度が大きく拡大しU(eff)に差が生ずること,および,(3)d8-Br塩の急冷状態が絶縁体なのはU(eff)の差ではなく,80Kの構造変化が不完全になりダイマー問の移動積分(つまりはバンド幅)が小さくなるためであることがわかった.h8-Brでは,d8-Brの急冷状態とほぼ同じ傾向が観測された.これは徐冷時には金属(11.6K以下で超伝導)になることと一見矛盾するが,発表されているh8体のBr塩の構造データは,温度因子が低温でも大きく,構造的には急冷相であると考えられるので,実はダイマーモデルでも理解可能である.第2の物質系であるθ-(BEDT-TTF)(2)CsCo(SCN)(4)では,金属状態ではBEDT-TTF分子の2量体化がなく,したがって単一の3/4 filledバンドをもち,フェルミ面も常圧では楕円型に近い単純な形状をしている.アニオン中の金属原子を化学置換したものでは金属ー絶縁体転移温度が系統的に増加する.この化学置換により分子間の2面角が変化する結果バンド幅Wが減少することから,絶縁相がMott相であり,低温では2量体が形成されると予想されていた.たしかにθ-(BEDT-TTF)(2)CsCo(SCN)(4)の低温非金属状態では2倍の超格子構造が形成されることが発見されたが,その振幅,相関長から,ダイマーモデルのMott相としての取り扱いは困難であり,むしろ最近接クーロン反発の効果による電荷秩序相と考えた方よいことがわかった.なお,物理的な圧力を加えると,分子2面角θが増加するときに,化学置換の効果と逆にバンド幅Wは増加する.このように,物理圧効果と化学置換効果とは,体積の減少という点では似ているが本質的には異なることが明らかになった.更に10.7kbarの物理的圧力下では,衛星反射の観測により他に類例のない圧力誘起の2k(F)CDWを発見した.これはバンド幅の増大と擬1次元的なフェルミ面の形成の双方に起因するものとして理解される.
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
An oxygen isotopic study of meteorites: Implications of the early solar system processes
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
統計モデルにおける局所影響分析
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
On the cohomologies of free loop spaces and rational cyclic cohomologies
EN
Toshihiro
Yamaguchi
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
Inverse and direct images for quantum Weyl algebras
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
1999
FIBREWISE GENERAL TOPOLOGY
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
Genetic and Molecular Analyses of Sexual Morphogenesis in Coprinus cinereus
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
Quantized vortex in Bose Einstein condensate of dilute atom gases
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
SENSITIVITY ANALYSIS IN SPATIAL STATISTICS
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
Optimal Linear Discriminant Functions using Mathematical Programming
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
Si-L2,3線を利用した金属silicide/Si接合系試料の定量分析
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
CELL-TO-CELL COMMUNICATION WITH GROWTH FACTORS IN THE MOUSE PITUITARY GLAND
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
希土類化合物のL端吸収・発光における磁気円二色性の理論
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
Neural control of reproductive behavior in the male cricket Gryllus bimaculatus DeGeer
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
低温X線カメラの開発と有機一次元導体の研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
非線形励起による反強磁性体FeBO3のマイクロ波域磁気弾性波の研究
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
Noble Gas Systematics and K-Ar Chronology: Implications for the Geochemical and Geotectonic Evolution of the Cameroon Volcanic Line, West Africa.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
分子内エネルギー移動による高効率化学発光系の構築および化学発光反応機構の考察
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
Structured Multisignature Schemes
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2000
Functional roles of carboxyl-terminal domain of the photosystem II reaction center D1 polypeptide in the green alga Chlamydomonas reinhardtii.
EN
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2001
TLスタック検出器による nuclearite の探索
EN
これまでに使われていない実験装置、熱ルミネッセンス(TL)シートと医療用X線フィルムを使ったnuclearite検出器(TLスタック検出器)の研究開発を行い、それを用いてnucleariteを探索した。TLシートのnucleariteに対する感度は2.3×10(-4)≤β≤6.6×10(-3)のイオン実験データを基に推定した。この際、入射粒子のエネルギー損失を直接のパラメーターとせず、入射粒子によってTLシートにどのような形でエネルギーが蓄積されるかを考慮した。この結果、低速領域でよりロバストな推定値が得られた。nuclearite探索は、イタリア、グランサッソー地下研究所にTLスタック検出器を設置して行った。稀にしか起こらないと予想される事象を探索する実験ではバックグラウンド事象の評価が重要である。地下実験におけるnuclearite事象のバックグラウンドとして、自然放射性物質および高エネルギーミューオン反応を検討した結果、これらが偽のnuclearite事象を起こす確率は無視できるほど小さいものであるとわかった。平均約994日の間設置されていた6.6uのTLスタック検出器を解析した結果、nuclearite事象は見出されなかった。これによりグランサッソー岩石中のエネルギー損失を無視できるような質量および速度の下向きnucleariteフラックスに対する90%信頼水準の上限値、1.3×10(-13) cm(-2)s(-1)sr(-1)(等方的フラックスに対しては6.4×10(-14) cm(-2)s(-1)sr(-1)が得られた。本研究で得られたnucIeariteフラックスの上限値はこれまでに他の実験グループによって得られた値と比べて最も小さいものではないが、ダークマター候補としてのnucleariteフラックスの上限値として十分有意なものである。そしてこれは熱ルミネッセンスシートの蛍光、燐光によって医療用X線フィルムを感光させるという実験技術によって得られた初めての結果であり、本研究は我々の銀河のnucleariteフラックスの上限値をより信頼できるものにしたと結論できる。
No potential conflict of interest relevant to this article was reported.
Acta Medica Okayama
2001
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2002
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2002
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2003
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2003
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