Search Results - (Author, Cooperation:T. Fujiwara)
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1Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-06-15Publisher: Institute of Physics (IOP)Print ISSN: 1755-1307Electronic ISSN: 1755-1315Topics: GeographyGeosciencesPhysicsPublished by: -
2Latest Papers from Table of Contents or Articles in PressMima, S., Kakinuma, C., Higuchi, T., Saeki, K., Yamada, T., Uematsu, R., Ishino, M., Kito, N., Nishikawa, H., Kuniyoshi, H., Matsumoto, T., Fujiwara, H., Paradiso, L. J., Shimada, Y., Iwamura, H.
The American Society for Pharmacology and Experimental Therapeutics
Published 2018Staff ViewPublication Date: 2018-06-05Publisher: The American Society for Pharmacology and Experimental TherapeuticsPrint ISSN: 0022-3565Electronic ISSN: 1521-0103Topics: MedicinePublished by: -
3Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-06-15Publisher: Institute of Physics (IOP)Print ISSN: 1755-1307Electronic ISSN: 1755-1315Topics: GeographyGeosciencesPhysicsPublished by: -
4Latest Papers from Table of Contents or Articles in PressT. Fujiwara ; S. Kodaira ; T. No ; Y. Kaiho ; N. Takahashi ; Y. Kaneda
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-12-07Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
5Latest Papers from Table of Contents or Articles in PressIijima, T., Kajitani, R., Komata, S., Lin, C.-P., Sota, T., Itoh, T., Fujiwara, H.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-04-19Publisher: American Association for the Advancement of Science (AAAS)Electronic ISSN: 2375-2548Topics: Natural Sciences in GeneralPublished by: -
6Latest Papers from Table of Contents or Articles in PressY. Mitsuya, T. Fujiwara, H. Takahashi and M. Uesaka
Institute of Physics Publishing (IOP)
Published 2018Staff ViewPublication Date: 2018-12-19Publisher: Institute of Physics Publishing (IOP)Electronic ISSN: 1748-0221Topics: PhysicsPublished by: -
7Latest Papers from Table of Contents or Articles in PressAkahori, Y., Wang, L., Yoneyama, M., Seo, N., Okumura, S., Miyahara, Y., Amaishi, Y., Okamoto, S., Mineno, J., Ikeda, H., Maki, T., Fujiwara, H., Akatsuka, Y., Kato, T., Shiku, H.
American Society of Hematology (ASH)
Published 2018Staff ViewPublication Date: 2018-09-14Publisher: American Society of Hematology (ASH)Print ISSN: 0006-4971Electronic ISSN: 1528-0020Topics: BiologyMedicineKeywords: Immunobiology and ImmunotherapyPublished by: -
8Latest Papers from Table of Contents or Articles in PressI. Imayoshi ; A. Isomura ; Y. Harima ; K. Kawaguchi ; H. Kori ; H. Miyachi ; T. Fujiwara ; F. Ishidate ; R. Kageyama
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-11-02Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Astrocytes/cytology/metabolism ; Basic Helix-Loop-Helix Transcription Factors/genetics/*metabolism ; Cell Lineage ; Cell Proliferation ; Female ; Gene Knock-In Techniques ; Homeodomain Proteins/genetics/metabolism ; Male ; Mice ; Mice, Transgenic ; Multipotent Stem Cells/*physiology ; Nerve Tissue Proteins/genetics/metabolism ; Neural Stem Cells/*physiology ; *Neurogenesis ; Neurons/cytology/metabolism ; Oligodendroglia/cytology/metabolism ; Optogenetics ; Telencephalon/cytology/metabolism ; Up-RegulationPublished by: -
9Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2018-01-26Publisher: BMJ PublishingElectronic ISSN: 2044-6055Topics: MedicineKeywords: Open access, Public healthPublished by: -
10Latest Papers from Table of Contents or Articles in PressY. Nakatani, H. Aratani, H. Fujiwara, T. Mori, A. Tsuruta, S. Tachibana, T. Yamaguchi, T. Kiss, A. Yamasaki, A. Yasui, H. Yamagami, J. Miyawaki, T. Ebihara, Y. Saitoh, and A. Sekiyama
American Physical Society (APS)
Published 2018Staff ViewPublication Date: 2018-03-30Publisher: American Physical Society (APS)Print ISSN: 1098-0121Electronic ISSN: 1095-3795Topics: PhysicsKeywords: Electronic structure and strongly correlated systemsPublished by: -
11Latest Papers from Table of Contents or Articles in PressFrancois, P., Fujiwara, T., van Ypersele, T.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-09-20Publisher: American Association for the Advancement of Science (AAAS)Electronic ISSN: 2375-2548Topics: Natural Sciences in GeneralPublished by: -
12Latest Papers from Table of Contents or Articles in PressKato, T., Noma, K., Ohara, T., Kashima, H., Katsura, Y., Sato, H., Komoto, S., Katsube, R., Ninomiya, T., Tazawa, H., Shirakawa, Y., Fujiwara, T.
The American Association for Cancer Research (AACR)
Published 2018Staff ViewPublication Date: 2018-10-02Publisher: The American Association for Cancer Research (AACR)Print ISSN: 1078-0432Electronic ISSN: 1557-3265Topics: MedicinePublished by: -
13Latest Papers from Table of Contents or Articles in PressTakeda, N., Inuzuka, R., Maemura, S., Morita, H., Nawata, K., Fujita, D., Taniguchi, Y., Yamauchi, H., Yagi, H., Kato, M., Nishimura, H., Hirata, Y., Ikeda, Y., Kumagai, H., Amiya, E., Hara, H., Fujiwara, T., Akazawa, H., Suzuki, J.-i., Imai, Y., Nagai, R., Takamoto, S., Hirata, Y., Ono, M., Komuro, I.
American Heart Association (AHA)
Published 2018Staff ViewPublication Date: 2018-05-31Publisher: American Heart Association (AHA)Print ISSN: 1942-325XElectronic ISSN: 1942-3268Topics: MedicineKeywords: Genetic, Association Studies, Aneurysm, Aortic DissectionPublished by: -
14Articles: DFG German National LicensesIkushima, A. J. ; Fujiwara, T. ; Saito, K.
[S.l.] : American Institute of Physics (AIP)
Published 2000Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Recent studies on two aspects of silica glass as a photonic material will be described. Part A of this review will be focused on structural disorder and structural relaxations in silica glass. With regard to the structural disorder, investigations have been made to improve transparency and to shift the optical absorption edge in the ultraviolet towards shorter wavelengths. Remarkable advances have been achieved in the understanding of both light scattering, which is a dominant factor in the optical losses in silica fibers, and the absorption edge. Freezing of the structural disorder was observed, and structural relaxations are found to be important for improving the transparency, whereas for the absorption edge thermal vibration effects seem to be more predominant than the structural disorder. From the results, the present authors have tried to control the structural relaxation for developing silica glass with an ultimate optical transparency, finding that a very tiny amount of the proper impurity species gives rise to structural subrelaxations, which are effective in reducing the Rayleigh scattering. The scattering was reduced by 13% by addition of only 10 wt ppm Na2O, for example. In part B of this review the second-order optical nonlinearity induced in Ge-doped silica glass will be described based on recent experiments carried out by the group of present authors. A large second-order optical nonlinearity has been successfully induced in the glass by simultaneous applications of a high dc electric field and ultraviolet (UV) irradiation, so-called UV poling. The nonlinearity induced by UV poling in bulk and film samples has achieved a magnitude of χ(2), comparable to or even larger than those of LiNbO3 and other crystals. Surprisingly enough, the nonlinearity induced by this method then decays after the UV poling as an exact single-exponential function of time, very much unlike the usual decay processes observed in glasses. Evidence is presented associating the nonlinearity with GeE′ defect centers created from oxygen deficient vacancies through photochemical reactions. The decay or degradation can be made much slower with the addition of proper impurities which work as electron scavengers. In addition, we have found that crystallites are generated in the glass by the UV poling, which leads to an increase in the third-order nonlinearity, χ(3), approximately 15 times larger than before the treatment. As a whole, the evidence strongly suggests that a major origin of the second-order nonlinearity induced in the glass is a combined effect of a large third-order nonlinearity associated with the crystallites and an internal space-charge field, where the charges to build up the field are produced during the formation of GeE′ centers. © 2000 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesHonma, T. ; Benino, Y. ; Fujiwara, T. ; Komatsu, T.
[S.l.] : American Institute of Physics (AIP)
Published 2002Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: The electronic polarizability and optical basicity of La2O3 and related glasses have been determined from ultraviolet absorption spectra and calculations based on the Lorentz–Lorenz equation. The optical basicity for La2O3 oxide is found to be 1.07, being much larger compared with typical glass-forming oxides such as B2O3 (0.42) and SiO2 (0.48) but being similar to heavy element oxides such as TeO2 (0.93). The Yamashita and Kurosawa's interaction parameter of La2O3 is 0.03 Å−3, indicating that La2O3 is classified as a normal ionic (basic) oxide, i.e., an ionic bonding character in the La3+–O bond is proposed. Close correlations are confirmed among optical basicity, interaction parameter, and oxygen 1s binding energy in x-ray photoelectron (XPS) spectra for La2O3–P2O5 and other La2O3-containing glasses. It is found from XPS and Raman spectra that La3+ ions in La2O3–P2O5 glasses act as network modifiers, supporting an ionic bonding character in the La3+–O bond. The parameters related to electronic polarizability in La2O3 determined in the present study would be useful for the design of rare-earth containing optical functional glasses. © 2002 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesKhaled, J. ; Fujiwara, T. ; Ohama, M. ; Ikushima, A. J.
[S.l.] : American Institute of Physics (AIP)
Published 2000Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Thin films of Ge-doped silica were prepared by radio-frequency sputtering in a controlled atmosphere of Ar and O2 and then subjected to ultraviolet irradiation under poling electric field (UV poling). Effects of oxygen mass flow content during the sputtering on the second-order nonlinearity of the films were investigated. Second harmonic generation (SHG) was observed and its intensity was found to depend greatly on the oxygen mass flow content with an optimum at 1 cm3/min. The annealing in a vacuum enhanced SHG intensity and values as high as 12.5±0.6 pm/V have been achieved with films containing 50 mole % of GeO2. This is on one hand, and we also found that loading thin films with hydrogen prior to UV poling largely improved the decay of SHG. A decay time as long as 7 years has been obtained. The change in second-order optical nonlinear properties of the films is discussed based on structural defects. © 2000 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesTakaki, K. ; Kobayashi, T. ; Fujiwara, T.
[S.l.] : American Institute of Physics (AIP)
Published 2000Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: Interferometer measurements are extremely informative in shock wave studies allowing direct evaluations of the gas density. The primary goal of the work presented is to build a laser interferometer that meets the requirements of the highest possible simplicity, economy, convenience, and ease of construction. In our experiments, we used a low average power (10 mW) He–Ne laser without complication, expense, and environmental section. The He–Ne laser interferometer with the Michelson arrangement was used to measure the line-averaged gas densities of shock waves. Temporal and spatial measurements of the density were performed for shock wave developments from high-current pulse discharges. The shock wave propagates in the radial direction of the discharge channel with supersonic speed. The shock velocity, however, decreased from 2–0.5 km/s with the distance of the shock propagation. The width of the high density region, that is in the vicinity of the shock front was compressed from 3.5 to 1.8 mm according to the time variation of the discharge current. © 2000 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesFujiwara, T. ; Sato, S. ; Mori, H.
Woodbury, NY : American Institute of Physics (AIP)
Published 1989Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: A novel method of measuring the photorefractive sensitivity of Ti-diffused channel waveguides in lithium niobate is proposed and demonstrated. It is suited for quantifying the dependence of the photorefractive sensitivity on the irradiation beam wavelength. From measurements at various irradiation intensities and wavelengths 0.633, 0.81, and 1.06 μm, we give an estimate of the crosstalk of a directional coupler as a function of irradiation intensity and wavelength.Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesTakahashi, Y. ; Benino, Y. ; Fujiwara, T. ; Komatsu, T.
[S.l.] : American Institute of Physics (AIP)
Published 2001Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Transparent optical nonlinear crystallized glasses with the composition of 25La2O3 25B2O3 50GeO2, stoichiometric to ferroelectric stillwellite-type LaBGeO5 crystalline phase, have been prepared by a two-step heat-treatment (first heat treatment: T1=670 °C, t1=10 h, second heat-treatment: T2, t2), and their second harmonic (SH) intensities have been examined using the Maker fringe method. The samples obtained by heat treatments at T2=720∼725 °C for t2=3 h show only surface crystallization and exhibit clear and fine (narrow) fringe patterns. The samples heat treated at T2=740 and 750 °C exhibit relatively strong SH intensities, but the fringe patterns in such samples are broad. It is proposed that SH waves generated from surface LaBGeO5 crystalline layers scatter at LaBGeO5 crystals formed in the interior of glass, causing the disappearance of fine fringe patterns. © 2001 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesJani, Muaffaq A. ; Takaki, K. ; Fujiwara, T.
[S.l.] : American Institute of Physics (AIP)
Published 1998Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: Low-voltage operation of a plasma reactor for exhaust gas treatment has been performed by using a multipoint-to-plane geometry device at high frequency. The plasma was produced in a narrow gap by a dielectric barrier discharge of 2–3 kV at 50 kHz. The multipoint electrode has 585 points in the shape of a quadrangular pyramid with 30°. Nitrogen oxide (NOx) removal performance of the reactor was tested for an exhaust gas from a diesel engine generator (20 kV A). The NOx components have been removed with about 100% efficiency of 0.3 mol/kW h from the exhaust gas with NOx concentration of 200 ppm. © 1998 American Institute of Physics.Type of Medium: Electronic ResourceURL: