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Search Results: 1 - 10 of 197869 matches for " N. Kamakura "
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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,
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,
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.
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.
Signal Source Classification Based on Independency Analysis of Doppler Signals
Kouhei Yamamoto,Kurato Maeno,Toshinari Kamakura
Lecture Notes in Engineering and Computer Science , 2012,
Ultrasound field measurement using a binary lens
Gregory T. Clement,Hideyuki Nomura,Tomoo Kamakura
Physics , 2014, DOI: 10.1109/TUFFC.2014.006800
Abstract: Field characterization methods using a scattering target in the absence of a point-like receiver have been well described in which scattering is recorded by a relatively large receiver located outside the field of measurement. Unfortunately, such methods are prone to artifacts due to averaging across the receiver surface. To avoid this problem while simultaneously increasing the gain of a received signal, the present study introduces a binary plate lens designed to focus spherically-spreading waves onto a planar region having a nearly-uniform phase proportional to that of the target location. The lens is similar to a zone plate, but modified to produce a bi-convex-like behavior, such that it focuses both planar and spherically spreading waves. A measurement device suitable for characterizing narrowband ultrasound signals in air is designed around this lens by coupling it to a target and planar receiver. A prototype device is constructed and used to characterize the field of a highly-focused 400 kHz air transducer along 2 radial lines. Comparison of the measurements with numeric predictions formed from nonlinear acoustic simulation showed good relative pressure correlation, with mean differences of 10% and 12% over center 3dB FWHM drop and 12% and 17% over 6dB.
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.
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.
Herpes simplex virus induces the marked up-regulation of the zinc finger transcriptional factor INSM1, which modulates the expression and localization of the immediate early protein ICP0
Maki Kamakura, Fumi Goshima, Chenhong Luo, Hiroshi Kimura, Yukihiro Nishiyama
Virology Journal , 2011, DOI: 10.1186/1743-422x-8-257
Abstract: INSM1 gene expression in HSV-1-infected normal human epidermal keratinocytes increased at least 400-fold 9 h after infection; INSM1 promoter activity was also markedly stimulated. Expression and subcellular localization of the immediate early HSV protein ICP0 was affected by INSM1 expression, and chromatin immunoprecipitation (ChIP) assays revealed binding of INSM1 to the ICP0 promoter. Moreover, the role of INSM1 in HSV-1 infection was further clarified by inhibition of HSV-1 replication by INSM1-specific siRNA.The results suggest that INSM1 up-regulation plays a positive role in HSV-1 replication, probably by binding to the ICP0 promoter.Herpes simplex virus types 1 (HSV-1) and 2 (HSV-2) are large DNA viruses with genomes consisting of at least 74 genes [1], which are classified into four groups with respect to their order of expression on the entry of HSV into the host cell. Immediate early (IE) genes are transcribed without prior viral protein synthesis. Early genes are expressed before the onset of viral DNA synthesis and require IE gene expression. Expression of delayed early genes is partially dependent on viral DNA synthesis, but that of late or true late genes is completely dependent on viral DNA synthesis. The cascade of HSV gene expression is tightly regulated by viral and cellular factors [2-6].HSV infection markedly affects expression of host cell genes. The HSV genome encodes a virion-associated endonuclease UL41 that degrades viral and cellular mRNA early in infection. The IE protein ICP27 also inhibits cellular gene expression by blocking mRNA splicing [7]. Although the high level of viral transcription appears to overcome the effect of these proteins, host cell protein synthesis is strongly suppressed early in HSV infection. However, microarray analysis has shown that HSV-infected cells express high levels of a significant number of cellular genes [8]. We have shown that transcript levels of the cellular genes ZSCAN4, ZNF342, and HBA2 increased by m
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