630 research outputs found
Preparation of Carrier-Free 59Fe
開始ページ、終了ページ: 冊子体のページ付
Distribution of Indium and Iodine in Cadmium Telluride during Crystal Growth by Bridgman Method
開始ページ、終了ページ: 冊子体のページ付
Estimation on Recovery Efficiency of Iron from Red Mud and Iron Concentrated Tailing by PIXE Method
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Sub-monolayer film growth of a volatile lanthanide complex on metallic surfaces
We deposited a volatile lanthanide complex, tris(2,2,6,6-tetramethyl-3,5-heptanedionato)terbium(III), onto metal surfaces of Cu(111), Ag(111) and Au(111) in vacuum and observed well-ordered sub-monolayer films with low temperature (5 K) scanning tunneling microscopy. The films show a distorted three-fold symmetry with a commensurate structure. Scanning tunneling spectroscopy reveals molecular orbitals delocalized on the ligands of the molecule. Our results imply that this complex can be transferred onto the metal substrates without molecular decomposition or contamination of the surface. This new rare-earth-based class of molecules broadens the choice of molecular magnets to study with scanning tunneling microscopy
Anisotropy in spatial order-disorder transformations and the vortex lattice symmetry transition in and
Explorations of the order-disorder transformation in vortex matter in single
crystals of tetragonal structured (c/a 3) borocarbide superconductors,
and , reveal that vortex arrays experience different
effective pinning in different crystallographic directions. We surmise that
correlation exists between the large anisotropy in effective pinning/disorder
and the differences in the (local) symmetry transition from rhombohedral to
(quasi) square vortex lattice(VL). For field along high symmetry directions,
like, c-axis and ab-basal plane, the VL symmetry is close to square and the
ordered state spans a large field interval. When the field is turned away from
the c-axis towards ab-plane, at intermediate angles, the region of ordered
state shrinks, in response to enhancement in effective pinning. At such
intermediate angles the symmetry of the VL would be far from ideal triangular
or square.Comment: 6 pages, 5 figures (Accepted in Euro Phys. Letts.
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Characterization of protein kinase C isoform's action on retinoblastoma protein phosphorylation, vascular endothelial growth factor-induced endothelial cell proliferation, and retinal neovascularization
Retinal neovascularization is a major cause of blindness and requires the activities of several signaling pathways and multiple cytokines. Activation of protein kinase C (PKC) enhances the angiogenic process and is involved in the signaling of vascular endothelial growth factor (VEGF). We have demonstrated a dramatic increase in the angiogenic response to oxygen-induced retinal ischemia in transgenic mice overexpressing PKCβ2 isoform and a significant decrease in retinal neovascularization in PKCβ isoform null mice. The mitogenic action of VEGF, a potent hypoxia-induced angiogenic factor, was increased by 2-fold in retinal endothelial cells by the overexpression of PKCβ1 or β2 isoforms and inhibited significantly by the overexpression of a dominant-negative PKCβ2 isoform but not by the expression of PKC α, δ, and ζ isoforms. Association of PKCβ2 isoform with retinoblastoma protein was discovered in retinal endothelial cells, and PKCβ2 isoform increased retinoblastoma phosphorylation under basal and VEGF-stimulated conditions. The potential functional consequences of PKCβ-induced retinoblastoma phosphorylation could include enhanced E2 promoter binding factor transcriptional activity and increased VEGF-induced endothelial cell proliferation
Upper critical field and de Haas-van Alphen oscillations in KOsO measured in a hybrid magnet
Magnetic torque measurements have been performed on a KOsO single
crystal in magnetic fields up to 35.3 T and at temperatures down to 0.6 K. The
upper critical field is determined to be 30 T. De Haas-van Alphen
oscillations are observed. A large mass enhancement of (1+) = = 7.6 is found. It is suggested that, for the large upper critical
field to be reconciled with Pauli paramagnetic limiting, the observed mass
enhancement must be of electron-phonon origin for the most part.Comment: 4 pages, 4 figures, published versio
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