A. Yamamoto

Publication List Details

Period

1984 - 2009

Number

208

Co-Authors

Prospects of Search for Solar Axions with Mass over 1 eV and Hidden Sector Photons (2009)

Ohta, R., Minowa, M., Inoue, Y., Akimoto, Y., Mizumoto, T., Yamamoto, A.

We present prospects of two experiments using the Tokyo Axion Helioscope. One is a search for solar axions. In the past measurements, axion mass from 0 to 0.27 eV and from 0.84 to 1.00 eV have been...

Status of Japanese gravitational wave detectors (2009)

Arai, K., Takahashi, R., Tatsumi, D., Izumi, K., Wakabayashi, Y., Ishizaki, H., ...

The Large-scale Cryogenic Gravitational wave Telescope (LCGT) is planned as a future Japanese project for gravitational wave detection. A 3 km interferometer will be built in an underground mine at...

New Fe-based superconductors: properties relevant for applications (2009)

Putti, M, Pallecchi, I, Bellingeri, E, Tropeano, M, Ferdeghini, C, Tarantini, A Palenzona C, ...

Less than two years after the discovery of high temperature superconductivity in oxypnictide LaFeAs(O,F) several families of superconductors based on Fe layers (1111, 122, 11, 111) are available....

Exclusive Measurements of pp -> dpi+pi0: Double-Pionic Fusion without ABC Effect (2009)

Kren, F., Bashkanov, M., Bogoslawsky, D., Calen, H., Clement, H., Demiroers, L., ...

Exclusive measurements of the reaction pp -> dpi+pi0 have been carried out at T_p = 1.1 GeV at the CELSIUS storage ring using the WASA detector. The isovector pi+pi0 channel exhibits no enhancement...

Development of high critical current density in multifilamentary round-wire Bi2Sr2CaCu2O8+x by strong overdoping (2009)

Shen, T., Jiang, J., Yamamoto, A., Trociewitz, U. P., Schwartz, J., Hellstrom, E. E., ...

Bi2Sr2CaCu2O8+x is the only cuprate superconductor that can be made into a round-wire conductor form with a high enough critical current density Jc for applications. Here we show that the Jc(5 T,4.2...

Template engineering of Co-doped BaFe2As2 single-crystal thin films (2009)

Lee, S., Jiang, J., Nelson, C. T., Bark, C. W., Weiss, J. D., Tarantini, C., ...

Understanding new superconductors requires high-quality epitaxial thin films to explore intrinsic electromagnetic properties, control grain boundaries and strain effects, and evaluate device...

A limit for the mu -> e gamma decay from the MEG experiment (2009)

Adam, MEG Collaboration: J., Bai, X., Baldini, A., Baracchini, E., Barchiesi, A., Bemporad, C., ...

A search for the decay mu -> e gamma, performed at PSI and based on data from the initial three months of operation of the MEG experiment, yields an upper limit BR(mu -> e gamma) < 3.0 x 10**-11 (90%...

Intergrain current flow in a randomly oriented polycrystalline SmFeAsO0.85 oxypnictide (2009)

Kametani, F., Li, P., Abraimov, D., Polyanskii, A. A., Yamamoto, A., Jiang, J., ...

We report a direct current transport study of the local intergrain connections in a polycrystalline SmFeAsO0.85 (Sm1111) bulk, for which we earlier estimated significant intergranular critical...

Weak-link behavior of grain boundaries in superconducting Ba(Fe1-xCox)2As2 bicrystals (2009)

Lee, S., Jiang, J., Weiss, J. D., Folkman, C. M., Bark, C. W., Tarantini, C., ...

We show that despite the low anisotropy, strong vortex pinning and high irreversibility field Hirr close to the upper critical field Hc2 of Ba(Fe1-xCox)2As2, the critical current density Jgb across...

Disorder effects on the superconducting properties of BaFe$_{1.8}$Co$_{0.2}$As$_2$ single crystals (2009)

Eisterer, M., Zehetmayer, M., Weber, H. W., Jiang, J., Weiss, J. D., Yamamoto, A., ...

Single crystals of superconducting BaFe$_{1.8}$Co$_{0.2}$As$_2$ were exposed to neutron irradiation in a fission reactor. The introduced defects decrease the superconducting transition temperature...

Modeling of methane bubbles released from large sea-floor area: Condition required for methane emission to the atmosphere (2009)

Yamamoto, A., Yamanaka, Y., Tajika, E.

Massive methane release from sea-floor sediments due to decomposition of methane hydrate, and thermal decomposition of organic matter by volcanic outgassing, is a potential contributor to global...

Two-Pion Production in Proton-Proton Collisions -- Experimental Total Cross Sections and their Isospin Decomposition (2009)

Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calen, H., Clement, H., Doroshkevich, E., ...

The two-pion production in pp-collisions has been investigated at CELSIUS in exclusive measurements from threshold up to $T_p$ = 1.36 GeV. Total and differential cross sections have been obtained for...

First Cool-down and Test at 4.5 K of the ATLAS Superconducting Magnet System Assembled in the LHC Experimental Cavern (2009)

Passardi, Giorgio, Barth, K, Delruelle, N, Dudarev, A, Haug, F, Pavlov, O, ...

The four superconducting magnets (Barrel Toroid, two End-Cap Toroids and Central Solenoid) of the ATLAS detector have been tested individually at 4.5 K in the LHC underground experimental cavern....

Neutron Irradiation of Sm-1111 (2009)

Eisterer, M., Weber, H. W., Jiang, J., Weiss, J. D., Yamamoto, A., Polyanskii, A. A., ...

SmFeAsO$_{1-x}$F$_x$ was irradiated in a fission reactor to a fast (E > 0.1 MeV) neutron fluence of 4x10^${21}$ m$^{-2}$. The introduced defects increase the normal state resistivity due to a...

High-field phase-diagram of Fe arsenide superconductors (2009)

Jo, Y. J., Jaroszynski, J., Yamamoto, A., Gurevich, A., Riggs, S. C., Boebinger, G. S., ...

Here, we report an overview of the phase diagram of single layered and double layered Fe arsenide superconductors at high magnetic fields. Our systematic magnetotransport measurements of...

Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics (2008)

Abat, E., Abbott, B., Abdallah, J., Abdelalim, A. A., Abdesselam, A., ...

A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance...

An Improved Limit on the Muon Electric Dipole Moment (2008)

Bennett, G. W., Bousquet, B., Brown, H. N., Bunce, G., Carey, R. M., Cushman, P., ...

Three independent searches for an electric dipole moment (EDM) of the positive and negative muons have been performed, using spin precession data from the muon g-2 storage ring at Brookhaven National...

Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2 (2008)

Yamamoto, A., Jaroszynski, J., Tarantini, C., Balicas, L., Jiang, J., Gurevich, A., ...

We performed high-field magnetotransport and magnetization measurements on a single crystal of the 122-phase iron pnictide Ba(Fe1-xCox)2As2. Unlike the HTS cuprates and 1111-phase oxypnictides,...

Combined microstructural and magneto optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides (2008)

Kametani, F., Polyanskii, A. A., Yamamoto, A., Jiang, J., Hellstrom, E. E., Gurevich, A., ...

In order to understand why the inter- and intra-granular current densities of polycrystalline superconducting oxypnictides differ by three orders of magnitude, we have conducted combined...

Tokyo Axion Helioscope (2008)

Minowa, M., Inoue, Y., Akimoto, Y., Ohta, R., Mizumoto, T., Yamamoto, A.

A new search result of the Tokyo axion helioscope is presented. The axion helioscope consists of a dedicated cryogen-free 4T superconducting magnet with an effective length of 2.3 m and PIN...

Search for solar axions with mass around 1 eV using coherent conversion of axions into photons (2008)

Inoue, Y., Akimoto, Y., Ohta, R., Mizumoto, T., Yamamoto, A., Minowa, M.

A search for solar axions has been performed using an axion helioscope which is equipped with a 2.3m-long 4T superconducting magnet, a gas container to hold dispersion-matching gas, PIN-photodiode...

Status report of the Tokyo axion helioscope experiment (2008)

Inoue, Y., Minowa, M., Akimoto, Y., Ota, R., Mizumoto, T., Yamamoto, A.

We have searched for solar axions with a detector which consists of a 4T x 2.3m superconducting magnet, PIN-photodiode X-ray detectors, and an altazimuth mount to track the sun. The conversion region...

Evidence for two distinct scales of current flow in polycrystalline Sm and Nd iron oxypnictides (2008)

Yamamoto, A., Polyanskii, A. A., Jiang, J., Kametani, F., Tarantini, C., Hunte, F., ...

Early studies have found quasi-reversible magnetization curves in polycrystalline bulk rare-earth iron oxypnictides that suggest either wide-spread obstacles to intergranular current or very weak...

Current status of the CLIO project (2008)

Yamamoto, K, Uchiyama, T, Miyoki, S, Ohashi, M, Kuroda, K, Ishitsuka, H, ...

CLIO (Cryogenic Laser Interferometer Observatory) is a Japanese gravitational wave detector project. One of the main purposes of CLIO is to demonstrate thermal-noise suppression by cooling mirrors...

Measurement of cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight (2008)

Abe, K., Fuke, H., Haino, S., Hams, T., Itazaki, A., Kim, K. C., ...

The BESS-Polar spectrometer had its first successful balloon flight over Antarctica in December 2004. During the 8.5-day long-duration flight, almost 0.9 billion events were recorded and 1,520...

Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO0.89F0.11FeAs (2008)

Yamamoto, A., Jiang, J., Tarantini, C., Craig, N., Polyanskii, A. A., Kametani, F., ...

The new rare-earth arsenate superconductors are layered, low carrier density compounds with many similarities to the high-Tc cuprates. An important question is whether they also exhibit weak-coupling...

The WASA Detector Facility at CELSIUS (2008)

Bargholtz, Chr., Bashkanov, M., Berłowski, M., Bondar, A., Bogoslawsky, D., Brodowski, W., ...

The WASA 4pi multidetector system, aimed at investigating light meson production in light ion collisions and eta meson rare decays at the CELSIUS storage ring in Uppsala is presented. A detailed...

Inter-Quark Potentials in Baryons and Multi-Quark Systems in QCD (2008)

Suganuma, H., Yamamoto, A., Sakumichi, N., Takahashi, T. T., Iida, H., Okiharu, F.

We perform the first studies of various inter-quark potentials in SU(3)$_{\rm c}$ lattice QCD. From the accurate lattice calculation for more than 300 different patterns of three-quark (3Q) systems,...

Disappearance of the N=14 Shell Gap in the Carbon Isotopic Chain (2008)

Stanoiu, M, Sohler, D, Sorlin, O, Azaiez, F, Dombradi, Z, Brown, B A, ...

The structure of C-17-20(6) nuclei was investigated by means of the in-beam gamma-ray spectroscopy technique using fragmentation reactions of radioactive beams. Based on particle-gamma and...

Disappearance of the $N=14$ shell gap in the C isotopic chain (2008)

Stanoiu, M., Sohler, D., Sorlin, O., Azaiez, F., Dombradi, Zs., Brown, B.A., ...

The structure of $^{17-20}_{6}$C nuclei was investigated by means of the in-beam $\gamma$-ray spectroscopy technique using fragmentation reactions of radioactive beams. Based on particle-$\gamma$ and...

Disappearance of the $N=14$ shell gap in the C isotopic chain (2008)

Stanoiu, M., Sohler, D., Sorlin, O., Azaiez, F., Dombradi, Zs., Brown, B.A., ...

The structure of $^{17-20}_{6}$C nuclei was investigated by means of the in-beam $\gamma$-ray spectroscopy technique using fragmentation reactions of radioactive beams. Based on particle-$\gamma$ and...

Disappearance of the $N=14$ shell gap in the C isotopic chain (2008)

Stanoiu, M., Sohler, D., Sorlin, O., Azaiez, F., Dombradi, Zs., Brown, B.A., ...

The structure of $^{17-20}_{6}$C nuclei was investigated by means of the in-beam $\gamma$-ray spectroscopy technique using fragmentation reactions of radioactive beams. Based on particle-$\gamma$ and...

Measurement of eta meson decays into lepton-antilepton pairs (2007)

Berłowski, CELSIUS/WASA Collaboration: M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Calén, H., ...

A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta->e+e-e+e- events are reported with a background of...

Measurement of the Slope Parameter for the eta->3pi0 Decay in the pp->pp eta Reaction (2007)

Bashkanov, M., Bogoslawsky, D., Calén, H., Capellaro, F., Clement, H., Demirörs, L., ...

The CELSIUS/WASA setup is used to measure the 3pi0 decay of eta mesons produced in pp interactions with beam kinetic energies of 1.36 and 1.45 GeV. The efficiency-corrected Dalitz plot and density...

Evidence for a 'Narrow' Roper Resonance - the Breathing Mode of the Nucleon (2006)

Clement, H., Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calen, H., Cappellaro, F., ...

All the time since its discovery the N$^*$(1440) baryon state, commonly known as Roper resonance, has been a state with many question marks - despite of its 4-star ranking in the particle data book....

Two-Pion Production in Nucleon-Nucleon Collisions and the ABC-Effect - Approaching a Puzzleby exclusive and Kinematically complete Measurements (2006)

Skorodko, T., Bashkanov, M., Bargholtz, C., Bogoslawsky, D., Calen, H., Cappellaro, F., ...

The ABC effect - a puzzling low-mass enhancement in the $\pi\pi$ invariant mass spectrum - is known from inclusive measurements of two-pion production in nuclear collisions, where it always showed...

Measurements of 0.2 to 20 GeV/n cosmic-ray proton and helium spectra from 1997 through 2002 with the BESS spectrometer (2006)

Shikaze, Y., Haino, S., Abe, K., Fuke, H., Hams, T., Kim, K. C., ...

We measured low energy cosmic-ray proton and helium spectra in the kinetic energy range 0.215 - 21.5 GeV/n at different solar activities during a period from 1997 to 2002. The observations were...

Pulse tube cryocooler with self-cancellation of cold stage vibration (2006)

Suzuki, T., Tomaru, T., Haruyama, T., Sato, N., Yamamoto, A., Shintomi, T., ...

We experimentally demonstrated a new method for reducing the vibration of the cold stage of a cryocooler. Comparing the RMS amplitude with the case of no phase shift of the driving gas pressure...

Measurement of the eta->pi+pi-e+e- decay branching ratio (2006)

Bashkanov, M., Bogoslawsky, D., Calén, H., Capellaro, F., Clement, H., ...

The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi+pi-e+e- is...

Joint LIGO and TAMA300 search for gravitational waves from inspiralling neutron star binaries (2006)

Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, J., Ajith, P., ...

We search for coincident gravitational wave signals from inspiralling neutron star binaries using LIGO and TAMA300 data taken during early 2003. Using a simple trigger exchange method, we perform an...

The pp -> pp pi pi pi reaction channels in the threshold region (2006)

Jacewicz, M., Koch, I., Bashkanov, M., Bogoslawsky, D., Calén, H., ...

The cross section for prompt neutral and charged three pion production in pp interactions was measured at excess energies in the range 160 - 217 MeV. That comprises the first measurement of the...

Joint LIGO and TAMA300 search for gravitational waves from inspiralling neutron star binaries (2006)

Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Ajith, P., ...

We search for coincident gravitational wave signals from inspiralling neutron star binaries using LIGO and TAMA300 data taken during early 2003. Using a simple trigger exchange method, we perform an...

Results of the search for inspiraling compact star binaries from TAMA300's observation in 2000-2004 (2006)

Akutsu, Tomomi, Akutsu, Tomotadu, Ando, Masaki, Arai, Koji, Araya, Akito, Asada, H., ...

We analyze the data of the TAMA300 detector to search for gravitational waves from inspiraling compact star binaries with masses of the component stars in the range 1M[sun]–3M[sun]. In this...

Superconductivity of InN with a well defined Fermi surface (2006)

Inushima, T., Kato, N., Maude, D. K., Lu, H., Schaff, W. J., Tauk, R., ...

In this report we present our recent investigation on the co-existence of superconducting and semiconducting properties in InN grown on sapphire (0001) by the use of MBE and MOCVD methods....

Measurements of Atmospheric Antiprotons (2005)

Yamato, K., Abe, K., Fuke, H., Haino, S., Makida, Y., Matsuda, S., ...

We measured atmospheric antiproton spectra in the energy range 0.2 to 3.4 GeV, at sea level and at balloon altitude in the atmospheric depth range 4.5 to 26 g/cm^2. The observed energy spectra,...

Exclusive Measurements of $pd\to ^3He \pi\pi$ : the $ABC$ Effect Revisited (2005)

Bashkanov, M., Bogoslawsky, D., Calén, H., Cappellaro, F., Clement, H., Demiroers, L., ...

Exclusive measurements of the reactions $pd\to$ $^3He \pi^+ \pi^-$ and $pd\to$ $^3He \pi^0\pi^0$ have been carried out at $T_p=0.895$ GeV at the CELSIUS storage ring using the WASA detector. The...

Universal relationship between crystallinity and irreversibility field of MgB2 (2005)

Yamamoto, A., Shimoyama, J., Ueda, S., Katsura, Y., Iwayama, I., Horii, S., ...

The relationship between irreversibility field, Hirr, and crystallinity of MgB2 bulks including carbon substituted samples was studied. The Hirr was found to increase with an increase of FWHM of MgB2...

Future Accelerator Magnet Needs (2005)

Devred, Arnaud, Gourlay, S A, Yamamoto, A

Superconducting magnet technology is continually evolving in order to meet the demanding needs of new accelerators and to provide necessary upgrades for existing machines. A variety of designs are...

Final Testing of the ATLAS Central Solenoid before Installation (2004)

Haug, F, Doi, Y, Haruyama, T, Kawai, M, Kondo, T, Kondo, Y, ...

The central solenoid is part of the superconducting magnet system of the ATLAS experiment at the CERN LHC collider. It provides a 2 tesla axial magnetic field for the inner 24 m3 volume centre...

Softening of Cu-O bond stretching phonon in tetragonal HgBa$_2$CuO$_{4+\delta}$ (2004)

Uchiyama, H., Baron, A. Q. R., Tsutsui, S., Tanaka, Y., Yamamoto, A., ...

Phonons in nearly optimally doped HgBa$_2$CuO$_{4+\delta}$ were studied by inelastic X-ray scattering. The dispersion of the low energy modes is well described by a shell model, while the Cu-O bond...

Phonon softening in HgBa§2CuO§4§+§#d and MgB§2. (2004)

Uchiyama, H., Baron, A.Q.R., Tsutsui, S., Tanaka, Y., Ishikawa, D., Lee, S., ...

7th Internat.Conf.on Spectroscopies in Novel Superconductors (SNS 2004), Sitges, E, July 11-16, 2004

Optical and electrochromic properties of RF reactively sputtered WO_3 films (2003)

Washizu, E., Yamamoto, A., Abe, Y., Kawamura, M., Sasaki, K., 阿部, 良夫, ...

The effects of deposition conditions, including substrate temperature and sputtering gas pressure, on the optical and electrochromic (EC) properties of WO_3 films prepared by RF reactive...

Electronic Structure of B-2$p\sigma$ and $p\pi$ States in MgB$_2$, AlB$_2$ and ZrB$_2$ Single Crystals (2003)

Nakamura, J., Nasubida, S., Kabasawa, E., Yamazaki, H., Yamada, N., Kuroki, K., ...

The effect of electron correlation (EC) on the electronic structure in MgB$_2$, AlB$_2$ and ZrB$_2$, is studied by examining the partial density of states (PDOS) of B-2$p\sigma$ and $p\pi$ orbitals...

Mutations in dynein link motor neuron degeneration to defects in retrograde transport (2003)

Hafezparast, M., Klocke, R., Ruhrberg, C., Marquardt, A., Ahmad-Annuar, A., Bowen, S., ...

Degenerative disorders of motor neurons include a range of progressive fatal diseases such as amyotrophic lateral sclerosis (ALS), spinal-bulbar muscular atrophy (SBMA), and spinal muscular atrophy...

Mutations in dynein link motor neuron degeneration to defects in retrograde transport (2003)

Hafezparast, M., Klocke, R., Ruhrberg, C., Marquardt, A., Ahmad-Annuar, A., Bowen, S., ...

Degenerative disorders of motor neurons include a range of progressive fatal diseases such as amyotrophic lateral sclerosis (ALS), spinal-bulbar muscular atrophy (SBMA), and spinal muscular atrophy...

Determination of the Fermi Surface of MgB$_2$ by the de Haas-van Alphen effect (2003)

Carrington, A., Meeson, P. J., Cooper, J. R., Balicas, L., Hussey, N. E., Yelland, E. A., ...

We report measurements of the de Haas-van Alphen effect for single crystals of MgB$_2$, in magnetic fields up to 32 Tesla. In contrast to our earlier work, dHvA orbits from all four sheets of the...

Test Results of a Variant-Design LHC Twin-Aperture Dipole Magnet (2003)

Giloux, C, Mompo, R, Siemko, A, Taylor, T M, Venturini-Delsolaro, W, Walckiers, L, ...

Since 1989, KEK and CERN carried out jointly an experimental program in the frame of the R&D work for the LHC main dipole. The mechanical structure of this design is based on a separate coil/collar...

Test Results of a Variant-Design LHC Twin-Aperture Dipole Magnet (2003)

Giloux, C, Mompo, R, Siemko, A, Taylor, T M, Venturini-Delsolaro, W, Walckiers, L, ...

Since 1989, KEK and CERN carried out jointly an experimental program in the frame of the R&D work for the LHC main dipole. The mechanical structure of this design is based on a separate coil/collar...

High-pressure synthesis of superconducting Nb{1-x}B2 (x = 0-0.48) with the maximum Tc = 9.2 K (2002)

Yamamoto, A., Takao, C., Masui, T., Izumi, M., Tajima, S.

Superconductivity with Tc above 9 K was found in metal-deficient NbB2 prepared under 5 GPa, while no clear superconductivity was observed down to 3 K in stoichiometric NbB2. The superconductivity was...

Crystal growth and characterization of MgB2: Relation between structure and superconducting properties (2002)

Lee, S., Masui, T., Mori, H., Eltsev, Yu., Yamamoto, A., Tajima, S.

We discuss the important aspects of synthesis and crystal growth of MgB2 under high pressure (P) and temperature (T) in Mg-B-N system, including the optimisation of P-T conditions for reproducible...

Force measurements of a superconducting-film actuator for a cryogenic interferometric gravitational-wave detector (2002)

Sato, N., Haruyama, T., Kanda, N., Kuroda, K., Miyoki, S., Ohashi, M., ...

We measured forces applied by an actuator with a YBCO film at near 77 K for the Large-scale Cryogenic Gravitational-wave Telescope (LCGT) project. An actuator consisting of both a YBCO film of 1.6...

Peak effect in single crystal MgB$_2$ superconductor for ${\bf H}\parallel c$-axis (2002)

Pissas, M., Lee, S., Yamamoto, A., Tajima, S.

We have studied the phase diagram of MgB$_2$ superconductor using a single crystal for ${\bf H}\parallel c$-axis. For the first time we report the existence of peak effect in the screening current in...

Search for sub-electronvolt solar axions using coherent conversion of axions into photons in magnetic field and gas helium (2002)

Inoue, Y., Namba, T., Moriyama, S., Minowa, M., Takasu, Y., Horiuchi, T., ...

A search for solar axions has been performed using an axion helioscope which is equipped with a 2.3m-long 4T superconducting magnet, PIN-photodiode X-ray detectors, and a telescope mount mechanism to...

de Haas-van Alphen effect in single crystal MgB_2 (2001)

Yelland, E. A., Cooper, J. R., Carrington, A., Hussey, N. E., Meeson, P. J., Lee, S., ...

We report observations of quantum oscillations in single crystals of the high temperature superconductor MgB_2. Three de Haas-van Alphen frequencies are clearly resolved. Comparison with band...

Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2 (2001)

Manzano, F., Carrington, A., Hussey, N. E., Lee, S., Yamamoto, A.

The temperature dependence of the London penetration depth,lambda(T), was measured in both single crystal and polycrystalline MgB_2 samples by a high-resolution, radio frequency technique. A clear...

The Superconducting Gap in MgB_2: Electronic Raman Scattering Measurements of Single Crystals (2001)

Quilty, J. W., Lee, S., Yamamoto, A., Tajima, S.

Polarisation-resolved Raman scattering measurements were performed on MgB_2 single crystals to determine the magnitude, symmetry and temperature dependence of the superconducting gap. A single sharp...

Growth, structure analysis and anisotropic superconducting properties of MgB2 single crystals (2001)

Lee, S., Mori, H., Masui, T., Eltsev, Yu., Yamamoto, A., Tajima, S.

Here we report the growth of sub-millimeter MgB2 single crystals of various shapes under high pressure in Mg-B-N system. Structure refinement using a single-crystal X-ray diffraction analysis gives...

Measurement of low-energy antiproton detection efficiency in BESS below 1 GeV (2001)

Asaoka, Y., Yoshimura, K., Yoshida, T., Abe, K., Anraku, K., Fujikawa, M., ...

An accelerator experiment was performed using a low-energy antiproton beam to measure antiproton detection efficiency of BESS, a balloon-borne spectrometer with a superconducting solenoid. Measured...

Structural Phase Transition Accompanied by Metal - Insulator Transition in PrRu4P12 (2000)

Lee, C. H., Matsuhata, H., Yamamoto, A., Ohta, T., Takazawa, H., Ueno, K., ...

A structural phase transition has been found using electron diffraction technique in PrRu4P12 accompanied by a metal - insulator (M - I) transition (TMI = 60K). Weak superlattice spots appeared at...

Mechanical quality factor of a sapphire fiber at cryogenic temperatures (2000)

Uchiyama, T., Tomaru, T., Tatsumi, D., Miyoki, S., Ohashi, M., Kuroda, K., ...

A mechanical quality factor of $1.1 \times 10^{7}$ was obtained for the 199 Hz bending vibrational mode in a monocrystalline sapphire fiber at 6 K. Consequently, we confirm that pendulum thermal...

Low-temperature form (Phase II) of ionic conductor Ag7TaS6 analyzed using high-resolution synchrotron X-ray powder diffraction data (2000)

Onoda, M., Wada, H., Pattison, P., Yamamoto, A., Ishii, M., Chapuis, G.

The ternary sulfide Ag7TaS6 displays high Ag-ion conductivity at ambient temperature, and the framework TaS6 and Ag ions can be respectively regarded as the host structure and guest ions. Two...

Design and development of the ATLAS central solenoid magnet (1999)

Yamamoto, A, Kondo, T, Doi, Y, Makida, Y, Tanaka, K, Haruyama, T, ...

The ATLAS central solenoid magnet is being constructed to provide a magnetic field of 2 T in the central tracking part of the ATLAS detector. As a key technology for a solenoid coil as thin as...

Precision Measurement of Cosmic-Ray Antiproton Spectrum (1999)

Orito, S., Maeno, T., Matsunaga, H., Abe, K., Anraku, K., Asaoka, Y., ...

The energy spectrum of cosmic-ray antiprotons has been measured in the range 0.18 to 3.56 GeV, based on 458 antiprotons collected by BESS in recent solar-minimum period. We have detected for the...

Mechanical Design and Characteristics of a Superconducting Insertion Quadrupole Model Magnet for the Large Hadron Collider (1999)

Kirby, G A, Nakamoto, T, Ostojic, R, Taylor, T M, Terashima, A, Higashi, N, ...

A superconducting insertion quadruple is being developed by KEK in collaboration with CERN for the Large Hadron Collider (LHC) project. The mechanical design of the magnet in which the pre-stress is...

Development and Test Results of a low-$\beta$ Quadrupole Model for the Large Hadron Collider (1999)

Ajima, Y, Burkhardt, E E, Doi, Y, Haruyama, T, Higashi, N, Iida, M, ...

A 1-m model of the high gradient 70 mm aperture superconducting low-b quadrupoles for the Large Hadron Collider (LHC) has been developed. A field gradient of 250 T/m at 1.9 K has been achieved with a...

Quench and Mechanical Behaviour of an LHC Low-$\beta$ Quadrupole Model (1999)

Nakamoto, T, Tanaka, K, Yamamoto, A, Tsuchiya, K, Burkhardt, E E, Higashi, N, ...

A one meter model of the high gradient 70 mm aperture superconducting low-b quadrupole has been developed at KEK. The design field gradient is 240 T/m at a current of 7677 A with a superconducting...

Development and Test Results of a low-$\beta$ Quadrupole Model for the Large Hadron Collider (1999)

Ajima, Y, Burkhardt, E E, Doi, Y, Haruyama, T, Higashi, N, Iida, M, ...

A 1-m model of the high gradient 70 mm aperture superconducting low-b quadrupoles for the Large Hadron Collider (LHC) has been developed. A field gradient of 250 T/m at 1.9 K has been achieved with a...

Superspace-group approach to the phase transition of Cu8GeSe6 (1999)

Onoda, M., Ishii, M., Pattison, P., Shibata, K., Yamamoto, A., Chapuis, G.

The high- and low-temperature forms, i.e., phase I (stable above 328 K) and phase II (stable below 328 K), of Cu8GeSe6 have been investigated by the powder X-ray diffraction method. Cu8GeSe6 II is...

Measurement of Low-Energy Cosmic-Ray Antiprotons at Solar Minimum (1998)

Matsunaga, H., Orito, S., Matsumoto, H., Yoshimura, K., Moiseev, A., Anraku, K., ...

The absolute fluxes of the cosmic-ray antiprotons at solar minimum are measured in the energy range 0.18 to 1.4 GeV, based on 43 events unambiguously detected in BESS '95 data. The resultant energy...

A New Limit on the Flux of Cosmic Antihelium (1997)

Saeki, T, Anraku, K, Orito, S, Ormes, J F, Imori, M, Kimbell, B L, ...

A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of BESS magnetic rigidity spectrometer. We have not observed any antihelium; this...

Design Study of a Superconducting Insertion Quadrupole Magnet for the Large Hadron Collider (1997)

Kirby, G A, Ostojic, R, Taylor, T M, Yamamoto, A, Tsuchiya, K, Higashi, N, ...

The conceptual design study of a high gradient super conducting insertion quadrupole magnet has been carried out in collaboration between KEK and CERN for the Large Hadron Collider (LHC) to be built...

Which Hypotheses Can Be Found with Inverse Entailment? (Extended Abstract) (1997)

A. Yamamoto, Akihiro Yamamoto, Fachgebiet Intellektik

3 -- Akihiro YAMAMOTO y Fachgebiet Intellektik, Fachbereich Informatik Technische Hochschule Darmstadt Alexanderstr. 10, D64283 Darmstadt, GERMANY Phone : +49-6151-16-2863, Fax : +49-6151-16-5326...

Refrigeration System for the ATLAS Experiment (1996)

Haug, F, Dauvergne, J P, Passardi, Giorgio, Cragg, D, Curé, C, Pailler, P, ...

The proposed ATLAS detector for the 27 km circumference LHC collider is of unprecedented size and complexity. The magnet configuration is based on an inner superconducting solenoid and large...

Refrigeration System for the ATLAS Experiment (1996)

Haug, F, Dauvergne, J P, Passardi, Giorgio, Cragg, D, Curé, C, Pailler, P, ...

The proposed ATLAS detector for the 27 km circumference LHC collider is of unprecedented size and complexity. The magnet configuration is based on an inner superconducting solenoid and large...

Status Of The New Muon (g-2) Experiment (1996)

B. L. Roberts, H.N. Brown, R. M. Carey, W. Earle, E. Efstathiadis, E. S. Hazen, ...

> g , D.W. HERTZOG g , S. SEDYKH g , D. URNER g , P. CUSHMAN h , S. GIRON h , J. KINDEM h , D. MAXAM h , D. MILLER h , C. TIMMERMANS h , D. ZIMMERMAN h , L.M. BARKOV i , A. CHERTOVSKIKH i , V.P....

Measurement of inclusive particle spectra and test of MLLA prediction in e+e- annihilation at \Sqrt s = 58 GeV (1995)

Itoh, R, Yamauchi, M, Yamaguchi, A, Abe, K, Abe, T, Adachi, I, ...

Inclusive momentum spectra are measured for all charged particles and for each of \pi^{\pm}, K^{\pm}, K^0/\overline{K^0}, and p/\overline{p} in hadronic events produced via e^+e^- annihilation at...

A THIN SUPERCONDUCTING SOLENOID WOUND WITH THE INTERNAL WINDING METHOD FOR COLLIDING BEAM EXPERIMENTS (1984)

Yamamoto, A., Inoue, H., Hirabayashi, H.

A new fabrication method of a thin and large solenoids is presented. The solenoid is wound with NbTi/Cu/Al superconductor, which is wound on the inner surface of an aluminum cylinder. The fabrication...

A THIN SUPERCONDUCTING SOLENOID WOUND WITH THE INTERNAL WINDING METHOD FOR COLLIDING BEAM EXPERIMENTS (1984)

Yamamoto, A., Inoue, H., Hirabayashi, H.

A new fabrication method of a thin and large solenoids is presented. The solenoid is wound with NbTi/Cu/Al superconductor, which is wound on the inner surface of an aluminum cylinder. The fabrication...

A THIN SUPERCONDUCTING SOLENOID WOUND WITH THE INTERNAL WINDING METHOD FOR COLLIDING BEAM EXPERIMENTS (1984)

Yamamoto, A., Inoue, H., Hirabayashi, H.

A new fabrication method of a thin and large solenoids is presented. The solenoid is wound with NbTi/Cu/Al superconductor, which is wound on the inner surface of an aluminum cylinder. The fabrication...

Mice with disrupted GM2/GD2 synthase gene lack complex gangliosides but exhibit only subtle defects in their nervous system.

Takamiya, K, Yamamoto, A, Furukawa, K, Yamashiro, S, Shin, M, Okada, M, ...

Gangliosides, sialic acid-containing glycosphingolipids, are abundant in the vertebrate (mammalian) nervous system. Their composition is spatially and developmentally regulated, and gangliosides have...

Isolation of GD3 synthase gene by expression cloning of GM3 alpha-2,8-sialyltransferase cDNA using anti-GD2 monoclonal antibody.

Haraguchi, M, Yamashiro, S, Yamamoto, A, Furukawa, K, Takamiya, K, Lloyd, K O, ...

For the isolation of ganglioside GD3 synthase (EC 2.4.99.8) cDNA, we developed an expression cloning approach that used an anti-GD2 monoclonal antibody for selection. A host recipient cell line that...

A mouse homolog of the Escherichia coli recA and Saccharomyces cerevisiae RAD51 genes.

Morita, T, Yoshimura, Y, Yamamoto, A, Murata, K, Mori, M, Yamamoto, H, ...

Analysis of mitotic and meiotic recombination in mammalian cells has been hampered by the complexity of the reactions involved as well as lack of mutants. Furthermore, none of the genes involved in...

Two forms of the low-affinity Fc receptor for IgE differentially mediate endocytosis and phagocytosis: identification of the critical cytoplasmic domains.

Yokota, A, Yukawa, K, Yamamoto, A, Sugiyama, K, Suemura, M, Tashiro, Y, ...

We have previously identified two species of the low-affinity human Fc receptor for IgE, Fc epsilon RIIa and Fc epsilon RIIb, which differ only in a short stretch of amino acids at the N-terminal...

Importance of fatty acid substituents of chemically synthesized lipid A-subunit analogs in the expression of immunopharmacological activity.

Kumazawa, Y, Nakatsuka, M, Takimoto, H, Furuya, T, Nagumo, T, Yamamoto, A, ...

The immunopharmacological activities of chemically synthesized lipid A-subunit analogs, 4-O-phosphono-D-glucosamine derivatives carrying different N- and 3-O-linked acyl groups, were investigated....

Purification and characterization of levanase from Actinomyces viscosus ATCC 19246.

Igarashi, T, Takahashi, M, Yamamoto, A, Etoh, Y, Takamori, K

The extracellular levanase of Actinomyces viscosus ATCC 19246 was purified about 3,701-fold in 11% yield from the bacterial culture supernatant by means of ammonium sulfate precipitation, followed by...

Purification and properties of hemagglutinin from culture supernatant of Bacteroides gingivalis.

Okuda, K, Yamamoto, A, Naito, Y, Takazoe, I, Slots, J, Genco, R J

The hemagglutinating factor (hemagglutinin) of Bacteroides gingivalis was prepared from the supernatant of a 5-day diffusate broth culture by ammonium sulfate precipitation and column chromatography...

Comparison of four methods for rapid detection of Pneumocystis carinii in respiratory specimens.

Cregan, P, Yamamoto, A, Lum, A, VanDerHeide, T, MacDonald, M, Pulliam, L

Four stains for the detection of Pneumocystis carinii in respiratory specimens were compared for sensitivity, specificity, preparation time, and ease of interpretation. One hundred specimens were...

Characterization of recombinant and native forms of a cell surface antigen of Porphyromonas (Bacteroides) gingivalis.

Joe, A, Yamamoto, A, McBride, B C

The cloning of genes encoding putative cell surface antigens of Porphyromonas gingivalis ATCC 33277 has been reported previously (B. C. McBride, A. Joe, and U. Singh, Arch. Oral Biol. 55:59S-68S,...

Novel PI(4)P 5-kinase homologue, Fab1p, essential for normal vacuole function and morphology in yeast.

Yamamoto, A, DeWald, D B, Boronenkov, I V, Anderson, R A, Emr, S D, Koshland, D

The FAB1 gene of budding yeast is predicted to encode a protein of 257 kDa that exhibits significant sequence homology to a human type II PI(4)P 5-kinase (PIP5K-II). The recently cloned human...

Homozygous familial hypercholesterolemia mutant with a defect in internalization of low density lipoprotein.

Miyake, Y, Tajima, S, Yamamura, T, Yamamoto, A

During studies on binding of low density lipoprotein (LDL) to fibroblasts from patients with the homozygous form of familial hypercholesterolemia (FH), a unique line was derived from subject M.N....

Right-hand border regions of octopine T-DNA are recognized by RNA polymerase of Agrobacterium as well as by VirD1 and VirD2 proteins.

Niwa, Y, Yamamoto, A, Machida, C, Takebe, I, Machida, Y

The T-DNA of octopine Ti plasmid of Agrobacterium tumefaciens contains TL- and TR-DNA regions each bounded by 25 base-pair-repeats (designated A, B, C and D from left to right). Short DNA segments...

New mutants of apolipoprotein E associated with atherosclerotic diseases but not to type III hyperlipoproteinemia.

Yamamura, T, Yamamoto, A, Sumiyoshi, T, Hiramori, K, Nishioeda, Y, Nambu, S

We analyzed the heterogeneity of apo E in very low density lipoprotein from 58 hyperlipidemic subjects with or without atherosclerosis, 69 patients with ischemic heart disease, and 100 apparently...

Molecular studies on primary lipoprotein lipase (LPL) deficiency. One base deletion (G916) in exon 5 of LPL gene causes no detectable LPL protein due to the absence of LPL mRNA transcript.

Takagi, A, Ikeda, Y, Tsutsumi, Z, Shoji, T, Yamamoto, A

We have systematically investigated a genetic defect resulting in a primary lipoprotein lipase (LPL) deficiency in a proband TN and his affected brother SN, both manifesting familial...

Immunoglobulin E-suppressing and immunoglobulin G-enhancing tetanus toxoid prepared by conjugation with pullulan.

Mitani, S, Yamamoto, A, Ikegami, H, Usui, M, Matuhasi, T

Immunoglobulin E (IgE) antibody response was found to be suppressed selectively and antigen specifically in mice given an antigen conjugated with pullulan, a linear copolymer of maltotriose, whereas...

Cadmium-induced stimulation of lipogenesis from glucose in rat adipocytes.

Yamamoto, A, Wada, O, Ono, T, Ono, H, Manabe, S, Ishikawa, S

Exposure of adipocytes of rats to CdCl2 caused acceleration of [3-3H]glucose incorporation into lipid maximally at 500 microM in Krebs-Ringer bicarbonate buffer, pH 7.4, containing 0.2% albumin....

Perfluorodecanoic acid enhances the formation of oleic acid in rat liver.

Yamamoto, A, Kawashima, Y

The feeding of perfluorodecanoic acid (PFDA) to male rats at a dietary concentration of 0.005% (w/w) for 7 days resulted in a marked increase in the activity of microsomal stearoyl-CoA desaturation...

Neuronal nitric oxide synthase generates superoxide from the oxygenase domain.

Yoneyama, H, Yamamoto, A, Kosaka, H

When l-arginine is depleted, neuronal nitric oxide synthase (nNOS) has been reported to generate superoxide. A flavoprotein module construct of nNOS has been demonstrated to be sufficient for...

Characterization of rec7, an early meiotic recombination gene in Schizosaccharomyces pombe.

Molnar, M, Parisi, S, Kakihara, Y, Nojima, H, Yamamoto, A, Hiraoka, Y, ...

rec7 is involved in intra- and intergenic meiotic recombination in all tested regions of the genome of the fission yeast Schizosaccharomyces pombe. Segregational analysis in a rec7 gene disruption...

No severe bottleneck during human evolution: evidence from two apolipoprotein C-II deficiency alleles.

Xiong, W J, Li, W H, Posner, I, Yamamura, T, Yamamoto, A, Gotto, A M, ...

The DNA sequences of a Japanese and a Venezuelan apolipoprotein (apo) C-II deficiency allele, of a normal Japanese apo C-II gene, and of a chimpanzee apo C-II gene were amplified by PCR, and their...

Inter- and intralaboratory variation of in vitro diffusion cell measurements: An international multicenter study using quasi-standardized methods and materials

Chilcott, RP, Barai, N, Beezer, AE, Brain, SI, Brown, MB, Bunge, AL, ...

In vitro measurements of skin absorption are an increasingly important aspect of regulatory studies, product support claims, and formulation screening. However, such measurements are significantly...

Non-invasive estimation by cross sectional echocardiography of myocardial damage in cardiomyopathy.

Tanaka, M, Nitta, S, Nitta, K, Sogo, Y, Yamamoto, A, Katahira, Y, ...

Retrospective and prospective studies of high resolution cross sectional echocardiograms were undertaken in order to establish an ultrasonic method for the non-invasive estimation of degeneration and...

Role of reactive oxygen species in neutrophil apoptosis following ingestion of heat-killed Staphylococcus aureus

Yamamoto, A, Taniuchi, S, Tsuji, S, Hasui, M, Kobayashi, Y

Neutrophils, short-lived leucocytes that die by apoptosis, play an important role in the first stage of defense against bacterial infections. It has been reported that phagocytosis of intact bacteria...

CO2 permeability and bicarbonate transport in microperfused interlobular ducts isolated from guinea-pig pancreas

Ishiguro, H, Naruse, S, Kitagawa, M, Suzuki, A, Yamamoto, A, Hayakawa, T, ...

Permeabilities of the luminal and basolateral membranes of pancreatic duct cells to CO2 and HCO3− were examined in interlobular duct segments isolated from guinea-pig pancreas. Intracellular pH...

Thalamic experiential hallucinosis.

Noda, S, Mizoguchi, M, Yamamoto, A

Two patients with an infarct limited to the thalamus developed auditory and visual experiential hallucinations. Neuropathological studies in one patient showed a small cavity in the right...

Effect of alternating combination chemotherapy consisting of cyclophosphamide, doxorubicin, vincristine, cisplatin, and etoposide for small cell lung cancer on hematopoietic progenitors in the peripheral blood.

Shimizu, E., Yamamoto, A., Takahashi, Y., Maniwa, K., Yoshida, S., Mukai, J., ...

The effects of a combination chemotherapy (CAV-PVP) consisting of cyclophosphamide, doxorubicin, hydrochloride (dox) and vincristine (CAV) alternating with cisplatin and etoposide (PVP) on peripheral...

Pharmacological effects of 5-fluorouracil microspheres on peritoneal carcinomatosis in animals.

Hagiwara, A., Takahashi, T., Sawai, K., Sakakura, C., Tsujimoto, H., Imanishi, T., ...

A new delivery formulation (5FU-MS) of 5-fluorouracil (5FU), 5FU incorporated in microspheres composed of poly(glycolide-co-lactide) matrix, has been developed for the treatment of peritoneal...

Prognostic significance of cyclin E and p53 protein overexpression in carcinoma of the renal pelvis and ureter.

Furihata, M., Ohtsuki, Y., Sonobe, H., Shuin, T., Yamamoto, A., Terao, N., ...

Cyclin E gene alteration in the cell cycle plays an important role in carcinogenesis, while p53 protein affects different phase checkpoint pathways by activating p21WAF1/CIP1 in the normal cell...

Antitumour effects of streptococcal lipoteichoic acids on Meth A fibrosarcoma.

Usami, H., Yamamoto, A., Yamashita, W., Sugawara, Y., Hamada, S., Yamamoto, T., ...

The antitumour effects of lipoteichoic acids (LTA) extracted from Streptococcus pyogenes were studied in comparison with other streptococcal cellular components. LTA suppressed the tumour growth of...

Administration route-dependent vaccine efficiency of murine dendritic cells pulsed with antigens

Okada, N, Tsujino, M, Hagiwara, Y, Tada, A, Tamura, Y, Mori, K, ...

 Dendritic cells (DCs) loaded with tumour antigens have been successfully used to induce protective tumour immunity in murine models and human trials. However, it is still unclear which DC...

Androgens May Mediate a Relative Preservation of IGF-I Levels in Overweight and Obese Women Despite Reduced Growth Hormone Secretion

Utz, A. L., Yamamoto, A., Sluss, P., Breu, J., Miller, K. K.

Context: Obesity is characterized by reduced GH secretion, but data regarding IGF-I levels and their determinants are conflicting.