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31.
Shyuichi Izumiya Georgios T. Kossioris 《Archive for Rational Mechanics and Analysis》1997,139(3):255-290
32.
We introduce the notion of the lightcone Gauss–Kronecker curvature for a spacelike submanifold of codimension two in Minkowski
space, which is a generalization of the ordinary notion of Gauss curvature of hypersurfaces in Euclidean space. In the local
sense, this curvature describes the contact of such submanifolds with lightlike hyperplanes. We study geometric properties
of such curvatures and show a Gauss–Bonnet type theorem. As examples we have hypersurfaces in hyperbolic space, spacelike
hypersurfaces in the lightcone and spacelike hypersurfaces in de Sitter space. 相似文献
33.
For a closed curve in a CAT(K) space with given circumradius and upper bound on curvature, a basic lower bound on the length is established. The inequality is sharp, assumed only when the curve is the boundary of an isometric copy of a racetrack (the convex hull of two congruent circles) from a plane of constant curvature K. Previously such a theorem was proved for Euclidean plane curves by G.D.Chakerian, H.H. Johnson, and A. Vogt, and for curves in higher dimensional Euclidean spaces by A.D. Milka. A similar theorem is proved for nonclosed curves, with a notion of breadth replacing circumradius. Thus we illustrate how singular methods can extend classical Euclidean theorems to a large class of new spaces (including Riemannian manifolds of curvature bounded above) and also give significant strengthenings even in Euclidean space. 相似文献
34.
Yasuyuki Shimohigashi Tetsuo Kato Shinwon Kang Yoshihiro Minematsu Michinori Waki Nobuo Izumiya 《Tetrahedron letters》1979,20(15):1327-1328
The chemical shift of amide protons of acylamine acids showed a linear relation with electronegativity of the acyl groups. Prediction of the carbonyl group participated in intramolecular hydrogen bonding was discussed, gramiciding S being used as an example. 相似文献
35.
Zenta Kato Koichi Izumiya Naokazu Kumagai Koji Hashimoto 《Journal of Solid State Electrochemistry》2009,13(2):219-224
The change in the polarization potentials of anode and cathode due to pH change on electrode surfaces during galvanostatic
polarization was examined in 0.5 M NaCl solutions of different pH. On the basis of these results, feeding of the anolyte after
oxygen evolution to the cathode compartment for hydrogen production was examined for energy-saving seawater electrolysis.
This was assumed to prevent the occurrence of a large pH difference on cathode and anode in electrolysis of neutral solution
if sufficient H+ is permeated through the membrane. The cell performance was examined using Nafion 115 or Selemion HSF membranes for separation
of anode and cathode compartments. The permeation fraction of H+ with Nafion 115 was 45–65% in 0.5 M NaCl and was about 90% in 0.25 M Na2SO4. These values were smaller than 97% necessary for prevention of the occurrence of pH difference on cathode and anode. The
permeation fraction of H+ with Selemion HSF became more than 97% during electrolysis of 0.025 M Na2SO4, and the cell voltage was kept at low values. These results indicate the effectiveness of our seawater feeding system if
the 97% H+ permeation fraction through the membrane is attained.
Contribution to the Fall Meeting of the European Materials Research Society, Symposium D: 9th International Symposium on Electrochemical/Chemical
Reactivity of Metastable, Warsaw, 17th-21st September, 2007. 相似文献
36.
Myostatin preferentially down-regulates the expression of fast 2x myosin heavy chain in cattle 总被引:1,自引:0,他引:1
Hayashi S Miyake M Watanabe K Aso H Hayashi S Ohwada S Yamaguchi T 《Proceedings of the Japan Academy. Series B, Physical and biological sciences》2008,84(8):354-362
Myostatin is involved in an inhibitor of muscular growth and differentiation. Myoblasts derived from double-muscled Japanese shorthorn cattle (DM myoblasts) with absence of functional myostatin had higher abilities to proliferate and differentiate than myoblasts derived from normal-muscled cattle (NM myoblasts). In DM myoblasts, mRNA expressions of fetal myosin heavy chain (MyHC) in growth medium and of fast 2a and 2x MyHC in fusion medium were significantly greater than that in NM myoblasts. No significant difference existed in expressions of embryonic and slow MyHC mRNA between DM and NM myoblasts. The expression of MyoD mRNA was suppressed in myoblasts by administration of myostatin. Two cloned DM myoblast strains (DMc) were established. Addition of myostatin for DMc resulted in less myotube formation and suppression of mRNA expression of fast 2x MyHC. These findings suggest that the endogenous myostatin preferentially down-regulates the expression of the fast 2x MyHC and participates in differentiation of myofiber types during early bovine myogenesis. 相似文献
37.
Evolutes of Hyperbolic Plane Curves 总被引:2,自引:0,他引:2
Abstract We define the notion of evolutes of curves in a hyperbolic plane and establish the relationships between singularities of
these subjects and geometric invariants of curves under the action of the Lorentz group. We also describe how we can draw
the picture of an evolute of a hyperbolic plane curve in the Poincaré disk. 相似文献
38.
Izumiya S.; Pei D.; Fuster M. C. Romero; Takahashi M. 《Journal London Mathematical Society》2005,71(3):779-800
Some geometrical properties associated to the contact of submanifoldswith hyperhorospheres in hyperbolic n-space are studied as anapplication of the theory of Legendrian singularities. 相似文献
39.
We give a classification of generic vector fields near a generic submanifold. The normal forms are linear vector fields near the local model of the submanifold. Similar results are obtained for vector fields near a hypersurface with boundary and near a piecewise-smooth hypersurface. 相似文献
40.
Tatsuhiko Kanmera Haruhiko Aoyagi Michinori Waki Tetsuo Kato Nobuo Izumiya Kosaku Noda Tamio Ueno 《Tetrahedron letters》1981,22(37):3625-3628
Syntheses of cyclotetradepsipeptides, AM-toxin III and two analogs, were achieved, in which the Hofmann degradation method was used in order to derive a dehydroalanine residue from a 2,3-diaminopropionic acid residue in cyclodepsipeptide precursors. 相似文献