Simple, Non-catalytic Permethylation of Catechol Derivatives in Subcritical and Supercritical Water

Environmentally benign, non-catalytic, simple, and complete aromatic ring methylation of catechol derivatives by using 1,3,5-trioxane as the source of methyl groups was investigated in subcritical and supercritical water and under solvent-free conditions. Irrespective of the presence of subcritical and supercritical water as a reaction medium, catechol and 4-methylcatechol afforded the permethylation product 3,4,5,6-tetramethylcatechol. Only a small amount of 3,4,5,6-tetramethylcatechol (2% yield) was obtained under solvent-free conditions at 400 °C for 10 min. However, supercritical water considerably accelerated the formation of 3,4,5,6-tetramethylcatechol (13% yield) under the conditions of 400 °C, 10 min, and 0.35 g/mL water density

Probing dense and hot matter with low-mass dileptons and photons

Results on low-mass dileptons, covering the very broad energy range from the BEVALAC up to SPS are reviewed. The emphasis is on the open questions raised by the intriguing results obtained so far and the prospects for addressing them in the near future with the second generation of experiments, in particular HADES, NA60 and PHENIX.Comment: 6 pages, 8 figures, Proceedings of Hard Probes 2004 Conference, Ericeira, November 4-10, 2004. Caption of Figure 2 corrected. To be published in Eur. Phys. J. C. The orginal version is available at www.springerlink.co

Non-perturbative Pion Matrix Element of a twist-2 operator from the Lattice

We give a continuum limit value of the lowest moment of a twist-2 operator in pion states from non-perturbative lattice calculations. We find that the non-perturbatively obtained renormalization group invariant matrix element is _{RGI} = 0.179(11), which corresponds to ^{MSbar}(2 GeV) = 0.246(15). In obtaining the renormalization group invariant matrix element, we have controlled important systematic errors that appear in typical lattice simulations, such as non-perturbative renormalization, finite size effects and effects of a non-vanishing lattice spacing. The crucial limitation of our calculation is the use of the quenched approximation. Another question that remains not fully clarified is the chiral extrapolation of the numerical data.Comment: 26 pages, 10 figures, v2: final version, accepted for publication in EPJ

In-plane refractive-index anisotropy in porous silicon layers induced by polarized illumination during electrochemical etching

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Cooperation between the Japan International Cooperation Agency and the Obihiro University of Agriculture and Veterinary Medicine

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『今昔物語集』巻三十一の異境 （郷） 関連話 （第十一～十八話） にみる想像性とその限界

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Role of a 65-kDa Heat Shock Protein in Protective Immunity against Toxoplasma Infection

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Spatiotemporal dynamics of Bose-Einstein condensates in linear- and circular-chain optical lattices

application/pdfWe investigate the spatiotemporal dynamics of Bose-Einstein condensates in optical lattices that have a linear-or a circular-chain configuration with the tunneling couplings between nearest-neighbor lattice sites. A discrete nonlinear Schro¨dinger equation has been solved for various initial conditions and for a definite range of repulsive and attractive interatomic interactions. It is shown that the diversity of the spatiotemporal dynamics of the atomic population distribution such as a macroscopic self-trapping, bright and dark solitons, and symmetry breaking is derived from the positive and negative interatomic interactions. For the circular-chain configuration, two types of rotational modes are obtained as we introduce a definite relation for the initial phase conditions.journal articl

PRÄPOSITIONALISIERUNGSMÖGLICHKEIT DER "ZWEIWERTIGEN" ADJEKTIVA

Das gemeinhin als "Adjektiv" definierte voll funktioniert wie im folgenden Beispiel durchaus nicht immer als "Adjektiv", sondern vielmehr als "Präposition": Das Folgmädchen klirrte mit einem Teebrett voll Weingeleegläsern zur Tür herein, ... (Th. Mann) Die "Präpositionalität" von voll wird dadurch bewiesen, daß es dieselben sechs Eigenschaften besitzt wie alle Präpositionen, die HELBIG / BUSCHA (1972; 1986) als solche definiert. Die "Präpositionalität" von voll läßt sich jedoch schon durch sein Wesen als "zweiwertiges Adjektiv", das zwischen zwei Wörtern eine Beziehung herstellt, vermuten. Dies bedeutet, daß auch andere "zweiwertige" Adjektiva wie müde, ähnlich, treu u. a. die Möglichkeit innehaben, als Präposition zu funktionieren. Sind sie jedoch wirklich "Präpositionen" wie voll? Durch die Untersuchung ergibt sich, daß sich die "zweiwertigen" Adjektiva insofern von den Präpositionen und von voll unterscheiden, als bei ihnen die folgende attributive Verwendung nicht möglich ist: * Ein Mann müde des Lebens beging Selbstmord. Dennoch zeigt m. E. folgender grammatisch annehmbarer Satz mit Kommata eine große Realisierungsmöglichkeit dieser syntaktischen Konstruktion, d. h. der Präpositionalisierung der "zweiwertigen" Adjektiva: Ein Mann, müde des Lebens, beging Selbstmord.departmental bulletin pape

Introduction of University Museum Collection (43)

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