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Search Results: 1 - 10 of 138687 matches for " K. Hatanaka "
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Study of breakup mechanism of a loosely bound projectile in a region of Coulomb-breakup dominance
Okamura H.,Hatanaka K.,Ikeda T.,Itoh K.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100306010
Abstract: A kinematically complete measurement of the deuteron elastic break reaction has been carried out at Ed = 140 MeV on 12C, 40Ca, 90Zr, and 208Pb targets in a wide angular range of θp , θn = 0° –8° for a detailed study of the reaction mechanism of loosely bound projectiles in kinematical regions of Coulomb-breakup dominance. A nite-range calculation of the post-form distorted-wave Born approximation is presented.
Five steps in leukocyte extravasation in the microcirculation by chemoattractants
T. Oda,M. Katori,K. Hatanaka,S. Yamashina
Mediators of Inflammation , 1992, DOI: 10.1155/s0962935192000619
Inhibition of neutrophil migration by a selective inhibitor of matrix metalloproteinase: analysis by intravital microscopy
T. Oda,M. Katori,K. Hatanaka,Y. Nagai
Mediators of Inflammation , 1995, DOI: 10.1155/s0962935195000238
Mechanism of proton-$^3{\rm He} $ elastic backward scattering at intermediate energy
A. P. Kobushkin,E. A. Strokovsky,K. Hatanaka,S. Ishikawa
Physics , 2001,
Abstract: We provide systematic analysis of the differential cross section of the proton-$^3{\rm He}$ elastic scattering at $\theta_{\rm cm}=180^{\circ}$ and at $T_p<700$ MeV. Three mechanisms are discussed: 2N pair exchange in the triplet and singlet spin states, pion exchange and direct mechanism. It is shown that t Tp>150 MeV tree-body structure, including triplet and singlet states of the 2N pair, becomes of great importance for understanding energy dependence of the reaction observables. Prediction for the differential cross section and the polarization correlation $C_{00nn} which can be studied now in experiment are given. PACS number(s): 21.30.Cb, 21.30.-x, 25.40.Cm, 25.55.Ci
Vacuum Structure of Twisted Scalar Field Theories on M^{D-1} \otimes S^1
H. Hatanaka,S. Matsumoto,K. Ohnishi,M. Sakamoto
Physics , 2000, DOI: 10.1103/PhysRevD.63.105003
Abstract: We study scalar field theories on M^{D-1} \otimes S^1, which allow to impose twisted boundary conditions for the S^1 direction, in detail and report several interesting properties overlooked so far. One of characteristic features is the appearance of critical radii of the circle S^1. A phase transition can occur at the classical level or can be caused by quantum effects. Radiative corrections can restore broken symmetries or can break symmetries for small radius. A surprising feature is that the translational invariance for the S^1 direction can spontaneously be broken. A particular class of coordinate-dependent vacuum configurations is clarified and the O(N) \phi^4 model on M^{D-1}\otimes S^1 is extensively studied, as an illustrative example.
Thermal Phase Transition in the SO(5) x U(1) Gauge-Higgs Unification with 126GeV Higgs
Hatanaka, Hisaki
High Energy Physics - Phenomenology , 2013,
Abstract: We study the phase structure of the gauge theories in the space-time with one compact dimension, where the gauge symmetry can be broken by the Hosotani mechanism. As the extra dimension, we consider the SO(5) x U(1) gauge-Higgs unification in the Randall-Sundrum space-time which reproduce the 126 GeV Higgs mass. It is found that the thermal phase transition of the electroweak symmetry is almost second order and the critical temperature is around 160 GeV for z_L < 10^7 and n_F=3.
Vino y turismo del municipio de Cangas del Narcea (Asturias, Espa a)
Hatanaka, Masanori
PASOS : Revista de Turismo y Patrimonio Cultural , 2008,
Abstract: The objective of this work is to reconstruct the process of decline and the present hope of the wine sector of the municipality of Cangas del Narcea in the southwest of Asturias region in Spain, with attention to its relation with tourism. The stagnation of its wine sector commenced from a mid twentieth centuries by the several technical, economic and social problems. Some local actors with preoccupations react against the decay since 1990s. The attempt of recovery at wine works is parallel with several tourist initiatives. They are a wine museum, visit to wine caves, and some events related with the wine culture. These initiatives are also interesting to combine with other projects like the tourism and cultural interchange.
Matter Representations and Gauge Symmetry Breaking via Compactified Space
Hisaki Hatanaka
Physics , 1999, DOI: 10.1143/PTP.102.407
Abstract: We study dynamical gauge symmetry breaking via compactified space in the framework of SU(N) gauge theory in M^{d-1}\times S^1 (d=4,5,6) space-time. In particular, we study in detail the gauge symmetry breaking in SU(2) and SU(3) gauge theories when the models contain both fundamental and adjoint matter. As a result, we find that any pattern of gauge symmetry breaking can be realized by selecting an appropriate set of numbers (Nf,Nad) in these cases. This is achieved without tuning boundary conditions of the matter fields. As a by-product, in some cases we obtain an effective potential which has no curvature at the minimum, thus leading to massless Higgs scalars, irrespective of the size of the compactified space.
Uniqueness of the direct decomposition of toric manifolds
Miho Hatanaka
Mathematics , 2013,
Abstract: In this paper, we study the uniqueness of the direct decomposition of a toric manifold. We first observe that the direct decomposition of a toric manifold as \emph{algebraic varieties} is unique up to order of the factors. An algebraically indecomposable toric manifold happens to decompose as smooth manifold and no criterion is known for two toric manifolds to be diffeomorphic, so the unique decomposition problem for toric manifolds as \emph{smooth manifolds} is highly nontrivial and nothing seems known for the problem so far. We prove that this problem is affirmative if the complex dimension of each factor in the decomposition is less than or equal to two. A similar argument shows that the direct decomposition of a smooth manifold into copies of $\mathbb{C}P^1$ and simply connected closed smooth 4-manifolds with smooth actions of $(S^1)^2$ is unique up to order of the factors.
Development of supersonic plasma flows by use of a magnetic nozzle and an ICRF heating
M. Inutake,A. Ando,K. Hattori,H. Tobari,Y. Hosokawa,R. Sato,M. Hatanaka,K. Harata
Physics , 2004,
Abstract: A high-beta, supersonic plasma flow plays a crucial role in MHD phenomena in space and fusion plasmas. There are a few experimental researches on production and control of a fast flowing plasma in spite of a growing significance in the magnetized-plasma flow dynamics. A magneto-plasma-dynamic arcjet (MPDA) is one of promising devices to produce a supersonic plasma flow and has been utilized as an electric propulsion device with a higher specific impulse and a relatively larger thrust. We have improved the performance of an MPDA to produce a quasi-steady plasma flow with a transonic and supersonic Mach number in a highly-ionized state. There are two methods in order to control an ion-acoustic Mach number of the plasma flow exhausted from an MPDA: one is to use a magnetic Laval nozzle to convert a thermal energy to a flow energy and the other is a combined system of an ion heating and a divergent magnetic nozzle. The former is an analogous method to a compressible air flow and the latter is the method proposed in an advanced thruster for a manned interplanetary space mission. We have clarified the plasma flow characteristics in various shapes of a magnetic field configuration. It was demonstrated that the Mach number of the plasma flow could increase up to almost 3 in a divergent magnetic nozzle field. This paper reports recent results on the flow field improvements: one is on a magnetic-Laval-nozzle effects observed at the muzzle region of the MPDA, and the other is on ICRF (ion-cyclotron-range of frequency) heating of a supersonic plasma by use of a helical antenna.
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