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Search Results: 1 - 10 of 138572 matches for " K. Kamakura "
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Spontaneous Extracranial Vertebral Artery Dissociation: A Case Report and Review of the Literature  [PDF]
D. Kamakura, Y. Iida, K. Hasegawa, S. Tsuge, K. Fukutake, K. Nakamura, H. Takahashi, A. Wada
Open Journal of Orthopedics (OJO) , 2018, DOI: 10.4236/ojo.2018.86025
Abstract: We encountered a 36-year-old female who developed extracranial vertebral artery dissociation (EVAD), which is a rare condition in Japan. The disease developed with sudden severe right side neck pain and right upper arm pain. No abnormality was observed in the spinal canal, intervertebral discs, spinal cord, or nerve roots on MRI of the cervical spine, but dilation and double lumen were noted in the vertebral artery (VA) at the C4/5 level. The presence of aneurysm was confirmed by VA angiography, and EVAD was diagnosed. The symptoms were resolved by conservative treatment of pain, and the aneurysm shrank and disappeared with time on VA angiography. Even though neck and upper limb pain are the only clinical symptom and there is no brain dysfunction, such as disturbance of consciousness and vertigo, when symptoms develop acutely, this pathology should be included in differential diagnosis and orthopedists should carefully observe the vertebral artery, as well as the spinal canal, in evaluating cervical MRI.
Strip casting using a single roll caster equipped with a scraper
T. Haga,K. Akitsu,K. Kamakura,S. Kumai
Journal of Achievements in Materials and Manufacturing Engineering , 2012,
Abstract: Purpose: Purpose of this paper is to investigate the ability of a single roll caster equipped with a scraper. The purpose of the development of the single roll caster equipped with a scraper is casting of the strip without centre line segregation and porosity and with sound free solidified surface. The single roll caster can cast the strip without the centre segregation and porosity. However, the conditions of the free solidified surface and the thickness distribution are not sound. The scraper was adopted in order to improve the free solidified surface. Investigation of the effect of the scraper and the properties of the roll cast strip is the purpose of this paper.Design/methodology/approach: A scraper was developed to improve the free solidified surface condition. The scraper scribed the semisolid metal on the free solidified surface to make the free solidified surface flat. The scraper was made from mild-steel-plate, and it was coated by the insulator sheet of 2 mm-thick. The scraper was pushed to free solidified surface by the constant load.Findings: The scraper was very useful to improve the free solidified surface. AA5182 aluminium alloy strip could be cast at the speed up to 40 m/min. There was no centre segregation and porosity. There was no difference between the roll contact surface and the scribed surface. The mechanical properties of the roll cast strip were as same as those of strip made from D.C. cast slab. Hi-content Al-Mg alloy like Al-10 mass%Mg, which cannot be cast into the strip by the twin roll caster without centre segregation, could be cast into the strip without defect.Research limitations/implications: Metal which was investigated was only aluminium alloy. It is not clear that this process is useful to other alloys like steel, copper et. al.Practical implications: This process may be able to be used instead of the D.C. casting and the twin roll casting. Especially, this caster is useful the strip casting of the Al-Mg alloy.Originality/value: The single roll caster equipped with a scraper is original development. This caster may be useful for aluminium and magnesium sheet making companies.
Layer dependent band dispersion and correlations using tunable Soft X-ray ARPES
N. Kamakura,Y. Takata,T. Tokushima,Y. Harada,A. Chainani,K. Kobayashi,S. Shin
Physics , 2003, DOI: 10.1209/epl/i2004-10052-6
Abstract: Soft X-ray Angle-Resolved Photoemission Spectroscopy is applied to study in-plane band dispersions of Nickel as a function of probing depth. Photon energies between 190 and 780 eV were used to effectively probe up to 3-7 layers. The results show layer dependent band dispersion of the Delta_2 minority-spin band which crosses the Fermi level in 3 or more layers, in contrast to known top 1-2 layers dispersion obtained using ultra-violet rays. The layer dependence corresponds to an increased value of exchange splitting and suggests reduced correlation effects in the bulk compared to the surface.
Normal/Abnormal Gait Analysis based on the Statistical Registration and Modeling of the Frontal View Gait Data
Kosuke Okusa,Toshinari Kamakura
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
Gait Parameter and Speed Estimation from the Frontal View Gait Video Data Based on the Gait Motion and Spatial Modeling
Kosuke Okusa,Toshinari Kamakura
IAENG International Journal of Applied Mathematics , 2013,
Abstract:
Rimmed Vacuoles in Becker Muscular Dystrophy Have Similar Features with Inclusion Myopathies
Kazunari Momma, Satoru Noguchi, May Christine V. Malicdan, Yukiko K. Hayashi, Narihiro Minami, Keiko Kamakura, Ikuya Nonaka, Ichizo Nishino
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0052002
Abstract: Rimmed vacuoles in myofibers are thought to be due to the accumulation of autophagic vacuoles, and can be characteristic in certain myopathies with protein inclusions in myofibers. In this study, we performed a detailed clinical, molecular, and pathological characterization of Becker muscular dystrophy patients who have rimmed vacuoles in muscles. Among 65 Becker muscular dystrophy patients, we identified 12 patients who have rimmed vacuoles and 11 patients who have deletions in exons 45–48 in DMD gene. All patients having rimmed vacuoles showed milder clinical features compared to those without rimmed vacuoles. Interestingly, the rimmed vacuoles in Becker muscular dystrophy muscles seem to represent autophagic vacuoles and are also associated with polyubiquitinated protein aggregates. These findings support the notion that rimmed vacuoles can appear in Becker muscular dystrophy, and may be related to the chronic changes in muscle pathology induced by certain mutations in the DMD gene.
Temperature dependent Eu 3d-4f X-ray Absorption and Resonant Photoemission Study of the Valence Transition in $EuNi_2(Si_{0.2}Ge_{0.8})_2$
K. Yamamoto,K. Horiba,M. Taguchi,M. Matsunami,N. Kamakura,A. Chainani,Y. Takata,K. Mimura,M. Shiga,H. Wada,Y. Senba,H. Ohashi,S. Shin
Physics , 2005, DOI: 10.1103/PhysRevB.72.161101
Abstract: We study the mixed valence transition ($T$$_{v}$ $\sim$80 K) in EuNi$_{2}$(Si$_{0.2}$Ge$_{0.8}$)$_{2}$ using Eu 3$d-4f$ X-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (RESPES). The Eu$^{2+}$ and Eu$^{3+}$ main peaks show a giant resonance and the spectral features match very well with atomic multiplet calculations. The spectra show dramatic temperature ($T$)-dependent changes over large energies ($\sim$10 eV) in RESPES and XAS. The observed non-integral mean valencies of $\sim$2.35 $\pm$ 0.03 ($T$ = 120 K) and $\sim$2.70 $\pm$ 0.03 ($T$ = 40 K) indicate homogeneous mixed valence above and below $T$$_{v}$. The redistribution between Eu$^{2+}$$4f^7$+$[spd]^0$ and Eu$^{3+}$$4f^6$+$[spd]^1$ states is attributed to a hybridization change coupled to a Kondo-like volume collapse.
Randomized transmit and receive ultrasound tomography
Gregory T. Clement,Tomoo Kamakura
Physics , 2015,
Abstract: A tomographic method is considered that forms images from sets of spatially randomized source signals and receiver sensitivities. The method is designed to allow image reconstruction for an extended number of transmitters and receivers in the presence noise and without plane wave approximation or otherwise approximation on the size or regularity of source and receiver functions. An overdetermined set of functions are formed from the Hadamard product between a Gaussian function and a uniformly distributed random number set. It is shown that this particular type of randomization tends to produce well-conditioned matrices whose pseudoinverses may be determined without implementing relaxation methods. When the inverted sets are applied to simulated first-order scattering from a Shepp-Logan phantom, successful image reconstructions are achieved for signal-to-noise ratios (SNR) as low as 1. Evaluation of the randomization approach is conducted by comparing condition numbers with other forms of signal randomization. Image quality resulting from tomographic reconstructions is then compared with an idealized synthetic aperture approach, which is subjected to a comparable SNR. By root-mean-square-difference comparisons it is concluded that - provided a sufficient level of oversampling - the dynamic transmit and dynamic receive approach produces superior images, particularly in the presence of low SNR.
Bulk screening in core level photoemission from Mott-Hubbard and Charge-Transfer systems
M. Taguchi,A. Chainani,N. Kamakura,K. Horiba,Y. Takata,E. Ikenaga,T. Yokoya,S. Shin,K. Kobayashi,K. Tamasaku,Y. Nishino,D. Miwa,M. Yabashi,T. Ishikawa,T. Mochiku,K. Hirata,K. Motoya
Physics , 2004, DOI: 10.1103/PhysRevB.71.155102
Abstract: We report bulk-sensitive hard X-ray ($h\nu$ = 5.95 KeV) core level photoemission spectroscopy (PES) of single crystal V$_{1.98}$Cr$_{0.02}$O$_{3}$ and the high-$T_c$ cuprate Bi$_2$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ (Bi2212). V$_{1.98}$Cr$_{0.02}$O$_{3}$ exhibits low binding energy "satellites" to the V $2p$ "main lines" in the metallic phase, which are suppressed in the antiferromagnetic insulator phase. In contrast, the Cu $2p$ spectra of Bi2212 do not show temperature dependent features, but a comparison with soft X-ray PES indicates a large increase in the $2p^5 3d^9$ "satellites" or $3d^9$ weight in the bulk. Cluster model calculations, including full multiplet structure and a screening channel derived from the coherent band at the Fermi energy, give very satisfactory agreement with experiments.
Signal Source Classification Based on Independency Analysis of Doppler Signals
Kouhei Yamamoto,Kurato Maeno,Toshinari Kamakura
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
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