Ken Sasaki

Yokohama National University

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Tsuneo Uematsu

Kyoto University

Takahiro Ueda

Juntendo University

Jiro Kodaira

Hiroshima University

Norihisa Watanabe

Toshiba (Japan)

T. Uematsu

Kyoto University

Yoshio Kitadono

National Chin-Yi University of Technology

Y. Kurihara

High Energy Accelerator Research Organization

Yasuhisa Kuroda

Kyoto Institute of Technology

Tadashi Okamoto

Iwate University

Yasumasa Sakakibara

Kyoto Institute of Technology

Cooperative Institutions

European Organization for Nuclear Research

366

Fermi National Accelerator Laboratory

Lawrence Berkeley National Laboratory

Brookhaven National Laboratory

Centre National de la Recherche Scientifique

Kyoto University

High Energy Accelerator Research Organization

The University of Tokyo

Tohoku University

Istituto Nazionale di Fisica Nucleare

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Novel Ion-sensitive Field-effect Transistor with Ion Sensing Polymerized Silsesquioxane Membrane on Detachable Metal Disk

Electrochemistry (2007)

Yutaka Tsujimura Susumu Tsubota Ken Sasaki Hajime Karatani

We developed a new type of an ion-sensitive field-effect transistor (ISFET) with an ion sensing polymerized silsesquioxane (polySQ) membrane carrying a quaternary ammonium salt (QAS) as an ionophore. A noticeable feature of this ISFET is that the metal disc part is designed to be detachable from an FET body. Owing to this structure, the full polymerization of SQ at relatively high temperature became possible; leading to preparation of a durable ion sensing polySQ membrane on a metal disk connected to the FET gate terminal. The ISFET with the polySQ membrane carrying QAS (polySQ-QAS) (optimal content of QAS, 40 wt% in the matrix), prepared at 150°C for 3 h, showed not only the theoretical potential response to the nitrate ion concentration in the range of 1.0 × 10−6 to 0.10 mol dm−3 (M) with the Nernst slop of −61.5 mV·decade−1, but also the rapid response (3 s for 90% of response). Furthermore, the ion sensing property is favorably sustained even after being soaked in methanol for 24 h.

ISFET

Silsesquioxane

10.5796/electrochemistry.75.472

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Effects of time-reversal symmetric gauge fields on the groundstate properties of carbon nanotubes and tori: Persistent currents in twisted tori and local energy gap in deformed tubes

arXiv (Cornell University) (2005)

Ken Sasaki Yoshiyuki Kawazoe

The basic properties of conducting electrons in carbon nanotubes are reviewed from a theoretical perspective, and studies performed on persistent currents in toroidal carbon nanotubes and on the local energy gap in deformed nanotubes are reported on.

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QCD Corrections and New Physics

Jiro Kodaira T. Onogi Ken Sasaki

10.1142/9789814528559

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Heavy Flavour Effects in the Virtual Photon Structure Functions to NLO in QCD

Tsuneo Uematsu Yoshio Kitadono Ken Sasaki Takahiro Ueda

Flavour

Virtual particle

10.3360/dis.2009.140

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Target mass effects in polarized virtual photon structure functions

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (2003)

Hideshi Baba Ken Sasaki Tsuneo Uematsu

We study target mass effects in the polarized virtual photon structure functions ${g}_{1}^{\ensuremath{\gamma}}{(x,Q}^{2}{,P}^{2}),$ ${g}_{2}^{\ensuremath{\gamma}}{(x,Q}^{2}{,P}^{2})$ in the kinematic region ${\ensuremath{\Lambda}}^{2}\ensuremath{\ll}{P}^{2}\ensuremath{\ll}{Q}^{2},$ where $\ensuremath{-}{Q}^{2}(\ensuremath{-}{P}^{2})$ is the mass squared of the probe (target) photon. We obtain the expressions for ${g}_{1}^{\ensuremath{\gamma}}{(x,Q}^{2}{,P}^{2})$ and ${g}_{2}^{\ensuremath{\gamma}}{(x,Q}^{2}{,P}^{2})$ in closed form by inverting the Nachtmann moments for the twist-2 and twist-3 operators. Numerical analysis shows that target mass effects appear at large x and become sizable near ${x}_{\mathrm{max}}[=1/[{1+(P}^{2}{/Q}^{2})]],$ the maximal value of x, as the ratio ${P}^{2}{/Q}^{2}$ increases. Target mass effects for the sum rules of ${g}_{1}^{\ensuremath{\gamma}}$ and ${g}_{2}^{\ensuremath{\gamma}}$ are also discussed.

Virtual particle

10.1103/physrevd.68.054025

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Citations (7)

Niobium-tin persistent-current switch for the superconducting magnet of Maglev

IEEE Transactions on Applied Superconductivity (1999)

Kaoru Nemoto Sanetoshi SAITO Y. Sanada Ken Sasaki Seiichi Miyake

We designed and manufactured a persistent-current switch consisting of Nb/sub 3/Sn superconductive wire with an on-state current capacity of 600 A and an off-state resistance of 52 /spl Omega/ for the superconducting magnet of Maglev. To design a persistent current switch, it is important to suppress the instability such as degradation and training. Nb/sub 3/Sn has a higher critical temperature than that of NbTi which is commonly used for conventional persistent-current switches. Nb/sub 3/Sn wire is considered, therefore, to have higher stability to disturbance than NbTi wire. We reduced the volume and weight of the Nb/sub 3/Sn persistent-current switch to around 0.6 times and 0.7 times, respectively, that of the conventional NbTi persistent-current switch. Current-carrying capacity was tested both under the static and vibrating states. Test results of switching performance were compared with a computer simulation of temperature distribution in heating and cooling.

Persistent current

Niobium-tin

Maglev

Superconducting wire

10.1109/77.783266

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Citations (6)

Muonium hyperfine structure and the decayμ+→e++ν¯

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (1994)

H. Fujii Yukihiro Mimura Ken Sasaki Toru Sasaki

We examine the muonium ($\mu ^+e^-$)-antimuonium ($\mu ^-e^+$) system in the models which accomodate the dilepton gauge bosons, and study their contributions to the ground state hyperfine splitting in ``muonium''. We also consider the exotic muon decay $\mu ^+\to e^+ +\overline \nu _e +\nu _{\mu}$ mediated by the dilepton gauge boson, and obtain a lower bound $(M_{X^{\pm }}/g_{3l})>550 \rm GeV$ at 90\% confidence level for the singly-charged dilepton mass using the unitarity relation of the Kobayashi-Maskawa matrix for the 3-family case.

10.1103/physrevd.49.559

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Citations (40)

The anti-vibration durability of persistent current switch for the Maglev vehicle

Kaoru Nemoto Tomohisa Yamashita Ken Sasaki

This paper describes a vibration test apparatus for the persistent current switch and gives test results of one sample that is the same type as the persistent current witch for the Maglev vehicle. Running of the Maglev vehicle using a superconducting magnet, causes the persistent current switch to vibrate with a superconducting coil in the magnet. The persistent current switch must be able to operate under the vibration. The we built a vibration test apparatus for the persistent current switch and examined the anti-vibration durability of the sample. As a result, we discovered that the fixing force for the persistent current switch affects the anti-vibration durability. (orig.)

Maglev

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Aharonov-Bohm effect in higher genus materials [rapid communication]

Ken Sasaki Yoshiyuki Kawazoe Qiang Cai

Aharonov–Bohm effect

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The Measurements of the Complex Permittivities of Blood Samples in Quasi-Millimeter and Millimeter Wave Bands

IEICE Transactions on Communications (2007)

Hiroki Wakatsuchi Masahiro Hanazawa Shinji Watanabe Atsushi Nishikata Masaki Kouzai

We measured the complex permittivities of whole blood and blood plasma in quasi millimeter and millimeter wave bands using a coaxial probe method. The validity of these measurements was confirmed by comparing with those of a different measurement method, i.e., a dielectric tube method. It is shown that the complex permittivities of the blood samples are similar to those of water in quasi millimeter and millimeter wave bands. Furthermore, the temperature dependences of the complex permittivities of the samples were measured.

Extremely high frequency

10.1093/ietcom/e90-b.6.1357

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Citations (2)