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Search Results: 1 - 10 of 138955 matches for " K. Takayanagi "
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Equivalence of Local and Separable Realizations of the Discontinuity-Inducing Contact Interaction and Its Perturbative Renormalizability
Taksu Cheon,T. Shigehara,K. Takayanagi
Physics , 1998, DOI: 10.1143/JPSJ.69.345
Abstract: We prove that the separable and local approximations of the discontinuity-inducing zero-range interaction in one-dimensional quantum mechanics are equivalent. We further show that the interaction allows the perturbative treatment through the coupling renormalization. Keywords: one-dimensional system, generalized contact interaction, renormalization, perturbative expansion. PACS Nos: 3.65.-w, 11.10.Gh, 31.15.Md
Tunable Exchange Interaction in Quantum Dot Devices
H. Tamura,K. Shiraishi,H. Takayanagi
Physics , 2004, DOI: 10.1143/JJAP.43.L691
Abstract: We theoretically discuss the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between semiconductor quantum dots (QDs). When each QD having a local spin is coupled to the conduction electrons in semiconductors, an indirect exchange interaction, i.e., the RKKY interaction, is induced between two local spins. The RKKY interaction between QDs, which is mediated by the Fermi sea in semiconductors, is modulated by changing the Fermi energy, and the magnitude or even the sign of the exchange interaction can be tuned, which leads to a tunable magnetic transition in QD devices. We estimate the magnitude of the RKKY interaction in QDs as a function of the electron density and the inter-dot distance.
Interferons and IRF/Stat transcription factors in the regulation of immunity, oncogenesis and bone remodeling
T Taniguchi, A Takaoka, H Takayanagi, K Honda
Arthritis Research & Therapy , 2003, DOI: 10.1186/ar803
Small angle electron diffraction and deflection
T. Koyama,K. Takayanagi,Y. Togawa,S. Mori
AIP Advances , 2012, DOI: 10.1063/1.3701703
Abstract: Electron optical system is constructed in order to obtain small angle diffraction and Lorentz deflection of electrons at the order of down to 10-6 radian in the reciprocal space. Long-distance camera length up to 3000 m is achieved in a conventional transmission electron microscope with LaB6 thermal emission type. The diffraction pattern at 5 × 10-6 radian is presented in a carbon replica grating with 500 nm lattice spacing while the magnetic deflection pattern at 2 × 10-5 radian is exhibited in Permalloy elements. A simultaneous recording of electron diffraction and Lorentz deflection is also demonstrated in 180 degree striped magnetic domains of La0.825Sr0.175MnO3.
Electron microscopy of the strain on the Si(111)$7\times7$ surface induced by the STM tip
Y. Naitoh,K. Takayanagi,Y. Ohshima,H. Hirayama
Physics , 2001,
Abstract: The Si(111)7x7 surface was observed by reflection electron microscopy (REM) and scanning tunneling microscopy (STM) simultaneously in an ultra-high vacuum electron microscope. The distance between the STM tip and the Si surface was detected from the REM image, which showed the real and the mirror image of the tip. We approached the tip to the surface or retracted from the surface by a piezo drive to observe the strain induced on the Si(111)7x7 surface as a function of the tip-surface distance. This investigation was done with and without the bias voltage between the tip and the substrate. With bias voltage of 1.0 V on the sample, the tip was approached to 1.6 nm above the sample surface for the tunneling current of 0.8 nA, no detectable order of strain (10^{-4}) was induced on the sample surface. When the bias decreased within the range of -0.3 - +0.5 V, the surface was compressed over the Si surface area of 100 nm. Without the bias voltage, tensile and compressive strain was detected as the tip-surface distance changed from attractive to the repulsive interaction regime. The strain field extended over 50 - 140 nm, and the force became neutral at the tip-substrate distance of 0.45 nm.
Notes on Giant Gravitons on PP-waves
Hiromitsu Takayanagi,Tadashi Takayanagi
Physics , 2002, DOI: 10.1088/1126-6708/2002/12/018
Abstract: We investigate the giant gravitons in the maximally supersymmetric IIB pp-wave from several viewpoints: (i) the dynamics of D3-branes, (ii) the world-sheet description and (iii) the correlation functions in the dual N=4 Yang-Mills theory. In particular, we derive the BPS equation of a D3-brane with magnetic flux, which is equivalent to multiple D-strings, and discuss the behavior of solutions in the presence of RR-flux. We find solutions which represent the excitations of the giant gravitons in that system.
Open Strings in Exactly Solvable Model of Curved Spacetime and PP-Wave Limit
Hiromitsu Takayanagi,Tadashi Takayanagi
Physics , 2002, DOI: 10.1088/1126-6708/2002/05/012
Abstract: In this paper we study the superstring version of the exactly solvable string model constructed by Russo and Tseytlin. This model represents superstring theory in a curved spacetime and can be seen as a generalization of the Melvin background. We investigate D-branes in this model as probes of the background geometry by constructing the boundary states. We find that spacetime singularities in the model become smooth at high energy from the viewpoint of open string. We show that there always exist bulk (movable) D-branes by the effect of electric flux. The model also includes Nappi-Witten model as the Penrose limit and supersymmetry is enhanced in the limit. We examine this phenomenon in the open string spectrum. We also find the similar enhancement of supersymmetry can be occurred in several coset models.
Overview of osteoimmunology: What's happened? And what's going on?
Hiroshi Takayanagi
Arthritis Research & Therapy , 2012, DOI: 10.1186/ar3567
Why Japanese Aid is Ineffective in Reducing Poverty
Akio Takayanagi
Kasarinlan : Philippine Journal of Third World Studies , 1990,
Abstract: Japan is expected to become the largest donor of ODA (Official Development Assistance) in the world, due to the rapid increase of its ODA budget in recent years, high yen rate, and decrease in the ODA of the United States, erstwhile the biggest aid donor. The quality, however, of Japan's ODA has come under fire: the proportion of grants to loans is low; its beneficiaries are said to be Japanese corporations; and instead of helping the poor in the Third World, it has contributed to socio-cultural problems and environmental destruction. This paper discusses the allocation of ODA, Japan's policy on aid, the implementation of ODA, and recent trends.
Augmentation Mammaplasty Using Implants: A Review
Susumu Takayanagi
Archives of Plastic Surgery , 2012, DOI: http://dx.doi.org/10.5999/aps.2012.39.5.448
Abstract: One of the techniques for augmentation mammaplasty is the procedure using implants. Eventhough this technique has been used for many years, there are still several controversial issuesto be discussed and overcome for patient safety. In this review article, capsular contracture,leak or rupture of the implants, possible systemic disease, relation with breast cancer, andrecent problems with Poly Implant Prothese implants are described and discussed.
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