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Search Results: 1 - 10 of 139607 matches for " K. Nakajima "
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Phase transition of Two-timescale Two-temperature Spin-lattice Gas Model
C. H. Nakajima,K. Hukushima
Physics , 2008,
Abstract: We study phase transition of a nonequilibrium statistical-mechanical model, in which two degrees of freedom with different time scales separated from each other touch to their own heat bath. A general condition for finding anomalous negative latent heat recently discovered is derived a from thermodynamic argument. As a specific example, phase diagram of a spin-lattice gas model is studied based on a mean-field analysis with replica method. While configurational variables are spin and particle in this model, it is found that the negative latent heat appears in a parameter region of the model, irrespective of the order of their time scale. Qualitative differences in the phase diagram are also discussed.
Very Fast Chip-level Thermal Analysis
K. Nakabayashi,T. Nakabayashi,K. Nakajima
Physics , 2008,
Abstract: We present a new technique of VLSI chip-level thermal analysis. We extend a newly developed method of solving two dimensional Laplace equations to thermal analysis of four adjacent materials on a mother board. We implement our technique in C and compare its performance to that of a commercial CAD tool. Our experimental results show that our program runs 5.8 and 8.9 times faster while keeping smaller residuals by 5 and 1 order of magnitude, respectively.
Remarks on the Erroneous Dispersion Surfaces From a Pair of a Hyperbolic Branch and An Elliptical Arc of the Intersected Two Laue Spheres Based on the Usual Crude Approximation  [PDF]
Tetsuo Nakajima
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.23022
Abstract: In almost all previous works, the hyperbolic dispersion surfaces of the central proper quadrics have been crudely derived from the degree of reduction from the bi-quadratic equation by use of some roughly indefinable approximate relations. Moreover, neglecting the high symmetry of the hyperbola, both the branches have been approximated on the asymmetric surfaces composed of a pair of a branch of the hyperbola and a vertex of the ellipse without the presentation of reasonable evidence. Based upon the same dispersion surfaces equation, a new original gapless dispersion surfaces could be rigorously introduced without crude omission of even a term in the bi-quadratic equation based upon usual analogy with the extended band theory of solid as the close approximation to the truth.
Migration, Employment, and Industrial Development in Japan  [PDF]
Tetsuya Nakajima
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.48083
Abstract: Industrial development in Japan is accompanied by massive migration from agricultural to industrial areas. In a modified Harrod-Domar model, this paper compares two steady states, the first and the second, which emerge before and after the termination of such migration, respectively. Then, the paper shows that employment rates must be lower in the second steady state. Further, by examining the effects of fiscal policy, the paper shows that the balanced budget multiplier exceeds unity, and fiscal policy raises households’ disposable income and consumption.
Mechanical, Thermal and Electrical Properties of Lotus-Type Porous Metals  [PDF]
Hideo Nakajima
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.92017
Abstract: Lotus-type porous metals are fabricated by directional solidification of molten metals dissolving hydrogen. Unidirectional pores cause various anisotropic features of mechanical, thermal and electrical properties. Tensile, compressive and fatigue strength parallel to the pore direction are higher than those perpendicular to the pore direction. Besides, thermal and electrical conductivities parallel to the pore direction are higher than those perpendicular to the pore direction. Such anisotropy is attributed to the difference in the pinning cross-sectional area due to the dislocations and the scattering cross-sectional area due to electrons. The pore cross-sectional area perpendicular to the pore direction is much larger than that parallel to the pore direction. It is surmised that such difference in pore cross-section results in the anisotropy in mechanical, thermal and electrical properties.
Efficacy of pneumatic displacement with 40-degree downward gaze positioning for treatment of submacular hemorrhage: report of two cases
Nakajima M, Aso H, Nakayasu K
Clinical Ophthalmology , 2012, DOI: http://dx.doi.org/10.2147/OPTH.S37123
Abstract: acy of pneumatic displacement with 40-degree downward gaze positioning for treatment of submacular hemorrhage: report of two cases Case report (997) Total Article Views Authors: Nakajima M, Aso H, Nakayasu K Published Date November 2012 Volume 2012:6 Pages 1855 - 1858 DOI: http://dx.doi.org/10.2147/OPTH.S37123 Received: 17 August 2012 Accepted: 15 October 2012 Published: 08 November 2012 Masami Nakajima, Hiroshi Aso, Kohki Nakayasu Department of Ophthalmology, Division of Visual Science, Nihon University School of Medicine, Tokyo, Japan Background: Two retrospective case reports are described showing the efficacy of pneumatic displacement with 40-degree downward gaze positioning for treatment of submacular hemorrhage. Case 1 involved an 85-year-old woman who visited our clinic with a complaint of blurred vision in her right eye. Best corrected visual acuity (BCVA) of the right eye was hand motion. Her right eye showed a submacular hemorrhage with retinal macroaneurysm. Prone positioning was difficult because of the patient’s age and obesity. The treatment method was pneumatic displacement with 40-degree downward gaze positioning after intravitreal injection of 100% sulfur hexafluoride gas. After the treatment, the hemorrhage moved downward and BCVA of her right eye was 0.1. Case 2 involved a 58-year-old man with a complaint of blurred vision in his left eye. BCVA of his left eye was 0.3 and submacular hemorrhage was observed. He underwent displacement of the hemorrhage as previously described. After treatment, the submacular hemorrhage moved downward. Angiography detected a polypoidal lesion with a vascular network. upon diagnosis of polypoidal choroidal vasculopathy, bevacizumab was injected intravitreally. Two months after gas injection, the submacular hemorrhage disappeared. Optical coherence tomography showed flattening of the submacular retinal pigment epithelium, which was not observed prior to bevacizumab therapy. BCVA of the patient’s left eye was 0.9. Pneumatic displacement with 40-degree downward gaze positioning after intravitreal sulfur hexafluoride injection is useful to displace a submacular hemorrhage. Early application of this treatment provides improvement of vision and facilitates fundus examination, which could reveal the cause of the submacular hemorrhage.
Efficacy of pneumatic displacement with 40-degree downward gaze positioning for treatment of submacular hemorrhage: report of two cases
Nakajima M,Aso H,Nakayasu K
Clinical Ophthalmology , 2012,
Abstract: Masami Nakajima, Hiroshi Aso, Kohki NakayasuDepartment of Ophthalmology, Division of Visual Science, Nihon University School of Medicine, Tokyo, JapanBackground: Two retrospective case reports are described showing the efficacy of pneumatic displacement with 40-degree downward gaze positioning for treatment of submacular hemorrhage. Case 1 involved an 85-year-old woman who visited our clinic with a complaint of blurred vision in her right eye. Best corrected visual acuity (BCVA) of the right eye was hand motion. Her right eye showed a submacular hemorrhage with retinal macroaneurysm. Prone positioning was difficult because of the patient’s age and obesity. The treatment method was pneumatic displacement with 40-degree downward gaze positioning after intravitreal injection of 100% sulfur hexafluoride gas. After the treatment, the hemorrhage moved downward and BCVA of her right eye was 0.1. Case 2 involved a 58-year-old man with a complaint of blurred vision in his left eye. BCVA of his left eye was 0.3 and submacular hemorrhage was observed. He underwent displacement of the hemorrhage as previously described. After treatment, the submacular hemorrhage moved downward. Angiography detected a polypoidal lesion with a vascular network. upon diagnosis of polypoidal choroidal vasculopathy, bevacizumab was injected intravitreally. Two months after gas injection, the submacular hemorrhage disappeared. Optical coherence tomography showed flattening of the submacular retinal pigment epithelium, which was not observed prior to bevacizumab therapy. BCVA of the patient’s left eye was 0.9. Pneumatic displacement with 40-degree downward gaze positioning after intravitreal sulfur hexafluoride injection is useful to displace a submacular hemorrhage. Early application of this treatment provides improvement of vision and facilitates fundus examination, which could reveal the cause of the submacular hemorrhage.Keywords: 40-degree downward gaze position, submacular hemorrhage, intravitreal gas injection, sulfur hexafluoride, perfluoropropane
293FT cells transduced with four transcription factors (OCT4, SOX2, NANOG, and LIN28) generate aberrant ES-like cells
Oka Y,Nakajima K,Nagao K,Miura K
Journal of Stem Cells and Regenerative Medicine , 2010,
Abstract: The HEK 293 cell line (293 cells) was derived from human embryonic kidney (HEK) cells grown in tissue culture. 293 cells are very easy to grow and transfect and have been widely used in cell biological research for many years. 293 cells have many of the properties of immature neurons, suggesting that they represent a transformed neuronal cell present in the original kidney culture, and they are not useful as an in vitro model for kidney cell function. The 293T cell line contains the SV40 large T-antigen, which allows the episomal replication of transfected plasmids containing the SV40 origin of replication, and 293FT cells are a fast-growing variant. A recent report showed that introducing a set of transcription factors associated with pluripotency into human somatic cells can directly reprogram them to produce induced pluripotent stem (iPS) cells. To date, however, iPS cells have not been generated from immortalized cells. We examined whether iPS cells could be generated from 293 FT cells transfected with four transcription factors (OCT4, SOX2, NANOG, and LIN28). The obtained cells morphologically resembled human ES cells, and showed a similar marker gene expression pattern. These cells had an impaired ability to differentiate, and formed immature ectodermal tumors after they were transplanted into nude mice. Thus, we could not derive fully reprogrammed iPS cells from 293FT cells. We conclude that the 293FT cells transduced with OCT4, SOX2, NANOG, and LIN28 produced aberrant ES-like cells.
Dominance of excitation continuum in the longitudinal spectrum of weakly coupled Heisenberg S=1/2 chains
A. Zheludev,K. Kakurai,T. Masuda,K. Uchinokura,K. Nakajima
Physics , 2002, DOI: 10.1103/PhysRevLett.89.197205
Abstract: A low-field spin flop transition in the quasi one-dimensional antiferromagnet \ba is exploited to study the polarization dependence of low-energy magnetic excitations. The measured longitudinal spectrum is best described as single broad continuum, with no sharp ``longitudinal mode'', in apparent contradiction with the commonly used chain-MF/RPA theories. The observed behavior is also quite different than that previously seen in the related \kcuf material, presumably due to a large difference in the relative strength of inter-chain interactions. The results highlight the limitations of the chain-MF/RPA approach.
Critical Slowing Down of Triangular Lattice Spin-3/2 Heisenberg Antiferromagnet Li7RuO6 via 7Li NMR
Y. Itoh,C. Michioka,K. Yoshimura,K. Nakajima,H. Sato
Physics , 2008, DOI: 10.1143/JPSJ.78.023705
Abstract: We report 7Li NMR studies of single crystals of triangular-lattice Heisenberg antiferromagnet Li7RuO6. Slow critical divergence with a wide critical region of |T/TN - 1|< 7 was observed in 7Li nuclear spin-lattice relaxation rate. The slowing down of staggered spin fluctuations was analyzed in a renormalized classical region of a two-dimensional triangular-lattice non-linear sigma model. A spin stiffness constant was found to reduce to about 20 % from the value in a spin-wave approximation. The effect of spin frustration, e.g., Z2 vortex excitations on the critical phenomena is suggested.
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