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Search Results: 1 - 10 of 4137 matches for " Kazuhiro Watanabe "
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Near Infrared Characterization of Hetero-Core Optical Fiber SPR Sensors Coated with Ta2O5 Film and Their Applications
Keiju Takagi,Kazuhiro Watanabe
Sensors , 2012, DOI: 10.3390/s120202208
Abstract: This paper describes the characteristics of optical fiber sensors with surface plasmon resonance (SPR) at 1,310 nm in which the scattering loss of silica optical fiber is low. SPR operation in the infrared wavelength range is achieved by coating a thin tantalum pentaoxide (Ta2O5) film. The novelty of this paper lies in the verification of how the hetero-core scheme could be operated as a commercial base candidate in the sense of easy fabrication, sufficient mechanical strength, and significant sensitivity as a liquid detector under the basis of a low loss transmission network in the near infrared wavelength region. The effect of Ta2O5 layer thickness has been experimentally revealed in the wavelength region extending to 1,800 nm by using the hetero-core structured optical fiber. SPR characterizations have been made in the wavelength region 1,000–1,300 nm, showing the feasible operation at the near infrared wavelength and the possible practical applications. In addition, the technique developed in this work has been interestingly applied to a multi-point water-detection and a water-level gauge in which tandem-connected SPR sensors system using hetero-core structured fibers were incorporated. The detailed performance characteristics are also shown on these applications.
Heavy quark pair production in high energy pA collisions: Quarkonium
Fujii, Hirotsugu;Watanabe, Kazuhiro
High Energy Physics - Phenomenology , 2013,
Abstract: Quarkonium production in high-energy proton (deuteron)-nucleus collisions is investigated in the color glass condensate framework. We employ the color evaporation model assuming that the quark pair produced from dense small-x gluons in the nuclear target bounds into a quarkonium outside the target. The unintegrated gluon distribution at small Bjorken x in the nuclear target is treated with the Balitsky-Kovchegov equation with running coupling corrections. For the gluons in the proton, we examine two possible descriptions, unintegrated gluon distribution and ordinary collinear gluon distribution. We present the transverse momentum spectrum and nuclear modification factor for J/psi production at RHIC and LHC energies, and those for Upsilon(1S) at LHC energy, and discuss the nuclear modification factor and the momentum broadening by changing the rapidity and the initial saturation scale.
Leptons from heavy-quark semileptonic decay in pA collisions within the CGC framework
Hirotsugu Fujii,Kazuhiro Watanabe
Physics , 2015,
Abstract: We study single lepton production from semileptonic decays of heavy flavor hadrons ($D,B\rightarrow~l$) in pp and p$A$ collisions at RHIC and the LHC within the saturation/Color-Glass-Condensate (CGC) framework. Using the gluon distribution function obtained with the dipole amplitude, whose energy dependence is described by the Balitsky-Kovchegov equation with running coupling effect, we compute the transverse-momentum ($p_\perp$) spectra of the lepton yields at mid and forward rapidities. We find that a large fraction of leptons at low $p_\perp$ stems from the saturation regime of the incoming gluons in the target, especially in p$A$ collisions at the LHC. The resultant $p_\perp$ spectra is slightly harder than the data, but the nuclear modification factor seems consistent with the data within some uncertainty. We also update the nuclear modification factors for J/$\psi$ and $D$ meson at the LHC energy.
Heavy quark pair production in high energy pA collisions: Quarkonium
Hirotsugu Fujii,Kazuhiro Watanabe
Physics , 2013, DOI: 10.1016/j.nuclphysa.2013.06.011
Abstract: Quarkonium production in high-energy proton (deuteron)-nucleus collisions is investigated in the color glass condensate framework. We employ the color evaporation model assuming that the quark pair produced from dense small-x gluons in the nuclear target bounds into a quarkonium outside the target. The unintegrated gluon distribution at small Bjorken x in the nuclear target is treated with the Balitsky-Kovchegov equation with running coupling corrections. For the gluons in the proton, we examine two possible descriptions, unintegrated gluon distribution and ordinary collinear gluon distribution. We present the transverse momentum spectrum and nuclear modification factor for J/psi production at RHIC and LHC energies, and those for Upsilon(1S) at LHC energy, and discuss the nuclear modification factor and the momentum broadening by changing the rapidity and the initial saturation scale.
Huge mucinous borderline ovarian cystadenoma in a premenarchal girl  [PDF]
Atsushi Horiuchi, Kazuhiro Kameoka, Kouichi Sato, Yuji Yamamoto, Yuji Watanabe
Open Journal of Pediatrics (OJPed) , 2012, DOI: 10.4236/ojped.2012.21014
Abstract: Epithelial ovarian tumors are common in adult women, but rare in children. Especially mucinous ovarian cystadenoma is extremely rare, with only 16 cases in premenarchal girls reported to date. We present a case of 12-year-old premenarchal girl with symptoms of lower abdominal distension. CT showed a large multilocular tumor spreading throughout the entire abdominal cavity from the right upper quadrant to the pelvic cavity. The tumor was brought out little by little with aspiration of the fluid contents with a small incision. The tumor was found to originate from the left ovary, and oophorectomy was performed. The tumor measured 26 × 18 cm and weighed 5860 g. Histological diagnosis was mucinous ovarian cystadenoma with borderline malignancy. No evidence of recurrence had been seen as of 2 years postoperatively. In the review of premenarchal mucinous borderline ovarian cystadenoma, all cases were stage I and underwent salpingo-oophorectomy or oophorectomy. Those patients were alive without recurrence. Al-though mucinous borderline ovarian cystadenoma was characterized as malignancy, premenarchal cases showed favorable outcomes and salpingo-oohprectomy or oophorectomy appears appropriate.
Rodent Macrophage Select Vin Blank Together with Vin Rouge According to SO Level in Situ  [PDF]
Nobuo Yamaguchi, Keiko Matsuba, Kazuhiro Okamoto, Takanao Ueyama, Yoshiichiroh Matsuba, Katsuko Okuzumi, Ikkan Watanabe, Takashi Takahashi
Open Journal of Rheumatology and Autoimmune Diseases (OJRA) , 2014, DOI: 10.4236/ojra.2014.44033
Abstract: Phagocytic cells are known as multi potent activities for its ontogenical and phylogenetical aspect. One of the strike actions is super oxide anion known as critical role of the cell when microorganisms invade inside the cytoplasm. This agent sometimes triggered as a serious factor in the site of inflammation. There are many papers which concerned newly accessed anti-oxidative substances. However, many reports only focused on the molecular basis in vitro, suggesting vin rouge for their rich content of polyphonol rather than vin blank with a French paradox. We had been suggested that the key factor for oxidative stress needs to be discussed first for immunological standpoint, such as in phagocytic cell in situ. With this assay system in rodent macrophage, SO level was about the same for both groups administered vin blank as well as vin rouge.
Charge-density wave induced by combined electron-electron and electron-phonon interactions in 1$T$-TiSe$_2$: A variational Monte Carlo study
Hiroshi Watanabe,Kazuhiro Seki,Seiji Yunoki
Physics , 2015, DOI: 10.1103/PhysRevB.91.205135
Abstract: To clarify the origin of a charge-density wave (CDW) phase in 1$T$-TiSe$_2$, we study the ground state property of a half-filled two-band Hubbard model in a triangular lattice including electron-phonon interaction. By using the variational Monte Carlo method, the electronic and lattice degrees of freedom are both treated quantum mechanically on an equal footing beyond the mean-field approximation. We find that the cooperation between Coulomb interaction and electron-phonon interaction is essential to induce the CDW phase. We show that the "pure" exciton condensation without lattice distortion is difficult to realize under the poor nesting condition of the underlying Fermi surface. Furthermore, by systematically calculating the momentum resolved hybridization between the two bands, we examine the character of electron-hole pairing from the viewpoint of BCS-BEC crossover within the CDW phase and find that the strong-coupling BEC-like pairing dominates. We therefore propose that the CDW phase observed in 1$T$-TiSe$_2$ originates from a BEC-like electron-hole pairing.
A variational Monte Carlo study of exciton condensation
Hiroshi Watanabe,Kazuhiro Seki,Seiji Yunoki
Physics , 2015, DOI: 10.1088/1742-6596/592/1/012097
Abstract: Exciton condensation in a two-band Hubbard model on a square lattice is studied with variational Monte Carlo method. We show that the phase transition from an excitonic insulator to a band insulator is induced by increasing the interband Coulomb interaction. To examine the character of the exciton condensation, the exciton pair amplitudes both in $\bm{k}$-space and in real space are calculated. Using these quantities, we discuss the BCS-BEC crossover within the excitonic insulator phase.
Forward Heavy Quarkonium Productions at the LHC
Kazuhiro Watanabe,Bo-Wen Xiao
Physics , 2015, DOI: 10.1103/PhysRevD.92.111502
Abstract: We investigate the low transverse momentum heavy quarkonium ($J/\psi$, $\Upsilon$) productions in the forward rapidity region of $pp$ and $pA$ collisions at the LHC as an important probe to the transverse momentum tomography of the gluons in hadrons in the Color Glass Condensate (CGC) framework. By implementing the Sudakov resummation consistently in the CGC formalism, we achieve an excellent agreement between the improved CGC calculations and the LHC data. We show that both the small-$x$ and the Sudakov effects are essential for a complete description of heavy quarkonium productions in the low transverse momentum region. This provides a solid foundation to study the small-$x$ gluon saturation in a big nucleus with the future $pA$ programs at the LHC.
Traditional Japanese Style Bathing May Contribute to Good Health and Longevity  [PDF]
Mayumi Watanabe, Shigeharu Koboshi, Hiroshi Yoshimoto, Kazuhiro Kobayashi, Chikako Tomiyama, Toru Abo
Health (Health) , 2016, DOI: 10.4236/health.2016.88079
Abstract: The objective of this study was to determine how traditional Japanese style bathing could promote good health. Using healthy volunteers, we assessed body temperature (core and cutaneous), red blood cells, white blood cells (WBCs), venous blood gas parameters (PO2, SO2, PCO2, TCO2, HCO3, and pH), weight loss (which may indicate sweat volume), and the time until sweating before and after bathing. We simultaneously conducted a double-blind clinical trial using a bath additive group and a control group to investigate the effect of a bath additive on the same parameters. We found that bathing increased the core and cutaneous body temperature, as well as PO2, SO2, and blood pH. All of the subjects also showed increases in heart rate and weight loss (sweat volume). After bathing, the number and ratio of granulocytes increased while the number and ratio of lymphocytes decreased. These results tended to be emphasized in the bath additive group; however, significant between-group differences were not detected. Our results indicated that bathing improved blood circulation and had a modulatory effect on the autonomic nervous system. This suggested that traditional Japanese style bathing might contribute to good health and longevity; however, additional larger-scale studies were needed to confirm or refute this conclusion.
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