論文 - 大坊　真洋

住宅用火災警報器とスマートスピーカーを接続したICT火災通知システムの開発

千葉寿，小西誠一，大坊真洋

日本火災学会　火災   73 ( 2 ) 32 - 37   2023年04月  [査読有り]

学術誌  共著・分担

Vector Potential Coupling From Outside the Loop Through the Superconducting Shield

M. Daibo

IEEE Transactions on Applied Superconductivity ( IEEE )  33 ( 5 ) 1 - 5   2023年03月  [査読有り]

学術誌  単著

We tested whether the Maxwell-Lodge effect, a classi- cal version of the Aharonov-Bohm effect, occurs even when electro- magnetic shielding is provided by a superconducting tube. A long, thin superconducting solenoid coil was confined inside a lead tube so that there was no flux leakage from the coil ends. The double semi-circular vector potential coils ensure that 1) there is no local magnetic field at the location of the copper wire in the secondary coil and 2) there is no magnetic flux inside the loop of the secondary coil. Three different materials with different permeability were used for the core. A coaxial wire secondary coil shielded by a lead tube was placed orthogonally to the center of the semicircle of the primary coil. The voltage generated in the secondary coil at 4.2 K was only reduced to about 1/10 of 300 K. This coupling between the primary and secondary coils is due to the vector potential, since it cannot be completely shielded even with a superconducting shield.

DOI

Differential behavior of magnetic field and magnetic vector potential in an optically pumped Rb atomic magnetometer

Y. Shoji and M. Daibo

AIP Advances   13 ( 025127 )   2023年02月  [査読有り]

学術誌  共著・分担

Although vector potentials are more intrinsic physical quantities than magnetic and electric fields, measuring them macroscopically is difficult. A double-nested Helmholtz-type vector potential coil, consisting of an elongated solenoid coil wound around a cylinder, and producing a uniform magnetic vector potential, was developed in this study. The coil is carefully designed to reduce the influence of the leakage magnetic field and the scalar potential generated by the coil’s electrical resistance on the measurement. It has the ability to toggle between vector potential and magnetic field generation. We adapted the coil for use in an optically pumped atomic magnetometer. We also developed an optically pumping Rb atomic magnetometer that can calibrate in a zero magnetic field and applied a time-varying magnetic vector potential. We found that the output signal changed with the vector potential even when there was virtually no magnetic field. With increasing frequency, the output voltage decreases for the magnetic signal and increases for the magnetic vector potential signal. The results revealed that the atomic magnetometer is influenced not only by the magnetic field but also by the magnetic vector potential and that the frequency responses are opposite.

DOI

Self-interference along boundaries between positive and negative refractive index media for 3D displays

Masahiro Daibo, Tomoya Tabuchi, Prathan Buranasiri,

Proc. SPIE 11331     2020年03月  [査読有り]

国際的学術誌  共著・分担

Negative index media have a phase velocity opposite to that of the pointing vector. Therefore, if media having the same absolute value of positive and negative refractive indices are alternately arranged, standing waves are generated along the boundaries of the media because these wavelengths are the same and the directions are opposite. We propose a method of generating a stationary interference fringe that is caused by self-interference with irradiating light from a direction parallel to the positive and negative media boundaries.

DOI

Reflective wavefront control using random zero refractive index medium

T. Tabuchi, M. Daibo,

Proc. SPIE 11331     2020年03月  [査読有り]

国際的学術誌  共著・分担

The FDTD simulation is performed with a system in which the front-surface is a concave lens, the inside of bulk is a zero refractive index medium in which positive and negative refractive index cells are randomly arranged, and a reflector is placed over the back-surface plane. In a zero-index medium, an outgoing wavefront is always parallel to the outgoing- surface, is independent of either the incident wavefront or the shape of the incoming-surface. After waiting for a while after entering pulsed light into this structure, the light reflected from the back-surface is focused at the focal point of the concave lens over the front-surface.

DOI

DC-Bias-Magnetic-Field Dependence of Step Response in an Elliptically Polarized Single-Beam Atomic Magnetometer

Y. Shoji, S. Khanuengchat, S. Takahashi and M. Daibo

IEEE 2020 8th International Electrical Engineering Congress (iEECON)     2020年03月  [査読有り]

国際的学術誌  共著・分担

A single-beam atomic magnetometer with elliptical polarization is simple in construction because it requires only one laser for both pumping and probing. When a small-signal magnetic field is input into the magnetometer after the DC magnetic field is set to zero, a full-wave cleared waveform is output. This characteristic is appropriate for calibration and measurement of DC magnetic fields, because the bias of such fields affects their sensitivity. In this paper, we examined the step-response waveform when a pulsed magnetic field with various DC magnetic-field biases was applied. The response waveform was measured in the time domain with an oscilloscope. The oscillation frequency did not depend on the step-magnetic-field difference but on the amplitude when changing from an absolute-zero magnetic field to a finite magnetic field. Because the DC magnetic field can be determined by measuring the frequency, the bias magnetic field of the atomic magnetometer can be adjusted to maintain the

DOI

Modeling and Numerical Simulation for a Spherical Vector-Potential Coil

S. Lekchaum and M. Daibo

IEEE Transactions on Applied Superconductivity   30 ( 4 ) 1 - 5   2020年01月  [査読有り]

国際的学術誌  共著・分担

We proposed a model for a spherical vector-potential coil and investigated the properties of the coil, including the uniform distribution of the vector potential. We modeled a structure in which thin toroidal coils are superposed along a spherical surface. Rather than arranging the toroidal coils in close contact with each other along the surface of the sphere, the layer spacing of the toroidal coils should be constant so that the projection onto the axis of the sphere is equally spaced. When a current was applied to a toroidal coil, no magnetic field was created outside the toroidal coils; instead, a vector potential was present. When the same current was passed through each toroidal coil, the vector potential in the sphere achieved a uniform distribution by superposition. We presented the results of our numerical simulation of the distribution of the vector potential and the induced voltage when a secondary conductor was passed through the coil.

DOI

Zero Magnetic Field Calibration for Single-Beam Atomic Magnetometers Using Second Harmonics

K. Saenyot, Y. Shoji, S. Takahashi and M. Daibo

IEEE Magnetics Letters   10   1 - 4   2019年09月  [査読有り]

学術誌  共著・分担

DOI

Holographic Control of Electric Field Distribution for Mobile Communication

Masahiro Daibo, Hiroshi Okazaki, and Yasunori Suzuki

Published online: https://www.ieice.org/~mw/TJMW2019/     2019年06月  [査読有り]

学会誌  共著・分担

2019 Thailand-Japan MicroWave Proceedings of TJMW2019

トロイダル型ベクトルポテンシャルトランス

大坊真洋

Proceedings of the 2017 Eleventh International Conference on Sensing Technology (ICST)     2018年03月  [査読有り]

国際的学術誌  単著

DOI

正と負の屈折率粒子をランダムに配置したゼロ屈折率媒体

大坊　真洋

電子情報通信学会論文誌 C   J100–C ( 7 ) 227 - 285   2017年06月  [査読有り]

学術誌  単著

正と負の屈折率媒体セルを面積比率 1:1 でランダムに配置したゼロ屈折率媒体の性質を FDTD に より調べた.この媒体中では電界強度の分布がランダムになり，波面は完全に乱れるが，媒体の厚さが十分に厚 ければ，媒体から出射される波面は，入射波の波面，入射面形状，媒体中の空隙のいずれの影響も受けず，常に 出射面に平行であった.セルの大きさが波長の 20 分の 1 以下になると空間的に均一な媒体とみなすことができ， 屈折率がゼロの性質である位相速度無限大，媒体の入射面と出射面での位相の接続が現れた.これらの性質は， 光軸や焦点の調整が不要な集光器に利用することができる.混合比を変えることによって，屈折率を負から正ま で調整することができるので，負の屈折率媒体の絶対値を正確に調整する必要がなくなる.また，正と負の屈折 率媒体セルを規則的に層状に交互に配置したところ，層に直交する方向にゼロ屈折率の性質が現れ，異方性のあ るゼロ屈折率媒体となった.この異方性媒体では，球面波を入射すると入射波面と同じ波面で出射面から放出さ れる.また層を斜めに配置した場合は，横方向に伝搬方向がシフトする効果も現れた.

Vector-Potential Transformer with a Superconducting Secondary Coil and Superconducting Magnetic Shield

Masahiro Daibo, Shuzo Oshima, Yoichi Sasaki, and Kento Sugiyama

IEEE Transactions on Applied Superconductivity   26 ( 3 ) 500904   2016年03月  [査読有り]

国際的学術誌  共著・分担

Vector Potential Coil and Transformer

Masahiro Daibo, Shuzo Oshima, Yoichi Sasaki, and Kento Sugiyama

IEEE Transactions on Magnetics   51 ( 11 ) 1000604   2015年05月  [査読有り]

国際的学術誌  共著・分担

Optical characterization by variable angle spectroscopic ellipsometry of nitrogen-doped MgxZn1-xO thin filmes prepared by the plasma-assisted reactive evaporation method

Takami Abe, Akira Nakagawa, michiko Nakagawa, Tetsuya Chiba, Shuzo Takahashi, Yasuhiro Kashiwaba, Shigeki Chiba, Tsutomu Ojima, Katsumi Aota, Masahiro Daibo, Hiroshi Osada, Tamiya Fujiwara, Ikuo Niikura, Yasube Kashiwaba, Kouichi Tsutsumi, Michio Suzuki

Thin Solid Films   571   615 - 619   2014年11月  [査読有り]

国際的学術誌  共著・分担

Applicability of nitrogen-doped ZnO single crystals for photoconductive type UV sensors

Shuzo Takahashi, Takami Abe, Akira Nakagawa, Syuhei Kamata, Tetsuya Chiba, Michiko Nakagawa, Yasuhiro Kashiwaba, Shigeki Chiba, Haruyuki Endo, Kazuyuki Meguro, Masahiro Daibo, Ikuo Niikura, Yasube Kashiwaba, Shuzo Oshima, and Hiroshi Osada

Phys. Status Solidi C 9   11 ( 44020 ) 1304 - 1307   2014年03月  [査読有り]

国際的学術誌  共著・分担

Fabrication of Schottky barrier diodes using H2O2-treated non-polar ZnO(1010) substrates

Yasuhiro Kashiwaba, Mio Sakuma, Takami Abe, Akira Nakagawa, Ikuo Niikura, Yasube Kashiwaba, Masahiro Daibo, Hiroshi Osada

Applied Surface Science   186   126 - 130   2013年09月  [査読有り]

国際的学術誌  共著・分担

Hetero-epitaxial growth of non-polar ZnO films on single crystal NdGaO3 (001) substrates by MOCVD

Yasuhiro Kashiwaba, Tai Yokoyama, Mio Sakuma, Takami Abe, Akira Nakagawa, Ikuo Niikura, Yasube Kashiwaba, Masahiro Daibo, and Hiroshi Osada

physica status solidi（ｃ）   DOI 10.100   2013年03月  [査読有り]

国際的学術誌  共著・分担

Formation of a ZnO_2 layer on the surface of single crystal ZnO substrates with oxygen atoms by hydrogen peroxide treatment

Y. Kashiwaba, T. Abe, A. Nakagawa, I. Niikura, Y. Kashiwaba, M. Daibo, T. Fujiwara, and H. Osada

Journal of Applied Physics   113 ( 113501 )   2013年03月  [査読有り]

国際的学術誌  共著・分担

Epitaxial growth of high-quality MgxZn1-xO films by a plasma-assisted reactive evaporation method using ZnMg alloys as a source material

T. Abe, A. Nakagawa, M. Tanaka, M. Nakagawa, H. Endo, K. Megro, Y. Kashiwaba, S. Chiba, T. Ojima, K. Aota, S. Takahashi, M. Daibo, H. Osada, T. Fujiwara, K. Yamaguchi, I. Niikura, and Y. Kashiwaba

Phys. Status Solidi C 9   9 ( 8 ) 1813 - 1816   2012年08月  [査読有り]

国際的学術誌  共著・分担

Structure and optical properties of non-doped and N-doped ZnO films with no-polar serface grown homoepitaxially on single crystal ZnO(1120) substrates

Takami Abe, A. Nakagawa, S. Chiba, Y. Kashiwaba, H. Endo, K. Meguro, T. Ojima, K. Aota, M. Daibo, H. Osada, I. Niikura, Y. Kashiwaba, and T. Fujiwara

Phys. Status Solidi (c)   6 ( S1 ) s94 - s97   2009年05月  [査読有り]

学術誌  共著・分担

A Non-Energy-Concentrating Lens Using Left-Handed Material

Takakazu Yonezawa, Masahiro Daibo, and Norio Tayama

Optical Review   14 ( 6 ) 395 - 400   2007年08月  [査読有り]

学術誌  共著・分担

A non-energy-concentrated lens of left handed material

Takakazu Yonezawa, Masahiro Daibo and Norio Tayama

5th International Conference on Optics-photonics Design & Fabrication (ODF’06)     2006年12月

その他（含・紀要）  共著・分担

左手系媒質によるボール型レンズ

米澤隆一，大坊真洋，田山典男

信学技報   106 ( 203 ) 73 - 78   2006年09月

その他（含・紀要）  共著・分担

Ultraviolet Laser SQUID Microscope for GaN Blue Light Emitting Diode Testing

M Daibo, D Kamiwano, T Kurosawa, M Yoshizawa and N Tayama

Journal of Physics: Conference Series   43   1262 - 1265   2006年04月  [査読有り]

学術誌  共著・分担

Ultraviolet Laser SQUID Microscope for GaN Blue Light Emitting Diode Testing

M Daibo, D Kamiwano, T Kurosawa, M Yoshizawa and N Tayama

7th European Conference on Applied Superconductivity (EUCAS2005)   WE-P3-134   2005年09月

その他（含・紀要）  共著・分担

Discernment of Chemical Shift in MRMI System with Un-uniformity Magnetic Field

T. Akita, Y. Futada, N. Tayama, H. Kurita, H. Sato, M. Daibo

Proceedings of 9th WSEAS International Conference on COMPUTERS     2005年07月

その他（含・紀要）  共著・分担

Discernment of Chemical Shift in MRMI System Simulation

Toshihiro Akita, Yuichi Futada, Norio Tayama, Hiroaki Kurita, Hiroaki Sato, Masahiro Daibo

Proceedings of the 9th WSEAS CSCC (9th WSEAS International Conference on CIRCUIT, on SYSTEMS, on COMMUNICATION, and on COMPUTERS)     2005年07月

その他（含・紀要）  共著・分担

Discernment of Chemical Shift in ＭＲＭＩ System with Un-uniformity Magnetic Field

T. Akita, Y. Futada, N. Tayama, H. Kurita, H. Sato, M. Daibo

WSEAS TRANSACTIONS on INFORMATION SCIENCE and APPLICATIONS   2   687 - 694   2005年04月  [査読有り]

学術誌  共著・分担

Application of SQUIDs in Iwate CREATE project

M. Yoshizawa, D.F. He, K. Nakai, K. Nakai, K. Kobayashi, Y. Nakamura, M. Yaegashi, M. Ito, H. Yashiro, M. Daibo, T. Simizu, Y. Uchikawa and K. Noto

Physica C   426   1572 - 1579   2005年04月  [査読有り]

学術誌  単著

Examination of Relationship Between Resistivity and Photocurrent Induced Magnetic Field in Silicon Wafers Using Laser SQUID

Masahiro Daibo, Daisuke Kamiwano

IEEE Transactions on Applied Superconductivity   15 ( 2 ) 684 - 687   2005年01月  [査読有り]

学術誌  共著・分担

Development of Interactive multimedia database

Tatsuo Hasegawa, Tomeo Minamihaba, Masahiro Daibo, Takami Kumagai, Mitsuru Fujisawa, Norio Tayama

SPIE proc.   2915   183 - 190   2005年01月

その他（含・紀要）  共著・分担

Non-contacted resistivity measurement for high-resistivity of silicon wafers using laser SQUID method

Masahiro Daibo, Daisuke Kamiwano

Applied Superconductivity Conference (ASC2004)     52 - 52   2004年10月

その他（含・紀要）  共著・分担

HTSレーザーSQUID顕微鏡による半導体検査

大坊真洋

国際超電導産業技術研究センター超伝導Web21   ( ７月 ) 5 - 6   2004年07月

その他（含・紀要）  単著

Simulation of Industrial MRMI System with Un-uniformity Magnetic Field

Toshihiro Akita, Takakazu Yonezawa, Norio Tayama, Hiroaki Kato, Masahiro Daibo

Proceedings of the SOSM’04 (4th WSEAS International Conference on SOFT COMPUTING, OPTIMIZATION, SMULATION & MANUFACTURING SYSTEMS)     2004年04月

その他（含・紀要）  共著・分担

Computer Simulations on Industrial MRMI System for Inspecting Several Nuclei

(13) Toshihiro Akita, Takakazu Yonezawa, Norio Tayama, Hironori Kato, Masahiro Daibo

WSWAS Transactions on Computers   2 ( july ) 581 - 585   2004年01月  [査読有り]

学術誌  共著・分担

Simulation of Industrial MRMI System with Un-uniformity Magnetic Field

Toshihiro Akita, Takakazu Yonezawa, Norio Tayama, Hironori Kato, Masahiro Daibo

WSWAS Transactions on Systems   3 ( may ) 1234 - 1238   2004年01月  [査読有り]

学術誌  共著・分担

Simulation on Industrial MRMI System with Multiplex Wavelet Model

Toshihiro Akita, Takakazu Yonezawa, Norio Tayama, Hiroaki Kato, Masahiro Daibo

Proceedings of the ICOSMO 2003 (3rd WSEAS International Conference on SIMULATION, MODELLING AND OPTIMIZATION)     2003年10月

その他（含・紀要）  単著

Computer Simulation on Industrial MRMI System for Inspecting Several Nuclei

(10) Toshihiro Akita, Takakazu Yonezawa, Norio Tayama, Hiroaki Kato, Masahiro Daibo

Proceedings of the 2nd AEE (WSEAS International Conference on APPLICATIONS OF ELECTRICAL ENGINEERING 2003)     2003年09月

その他（含・紀要）  共著・分担

Minority Carrier Diffusion Length Measurements of Semiconductors using a Multi-Wavelength Laser SQUID Microscope

Masahiro DAIBO, Toshio KIKUCHI, and Masahito YOSHIZAWA

IEEE Transactions on Applied Superconductivity   13 ( 2 ) 223-226   2003年01月

学術誌  共著・分担

Structural analysis and magnetic properties of Fe/Bi system

Y. Harada, Y. Nakanishi, N. Yoshimoto, M. Daibo, M. Nakamura, M. Yoshizawa

Physica B   329-333   1109-1110   2003年01月

その他（含・紀要）  共著・分担

Mobile HTS rf SQUID Magnetometer

D.F.He, M. DAIBO, M. YOSHIZAWA

IEEE Transactions on Applied Superconductivity   13 ( 2 ) 200-202   2003年01月

学術誌  共著・分担

レーザーＳＱＵＩＤ顕微鏡の開発と半導体検査への応用

大坊真洋、菊地利雄

計測自動制御学会 産業論文集   2 ( 3 ) 19-26   2003年01月

その他（含・紀要）  共著・分担

Minority carrier diffusion length measurements of semiconductors using a multi-wavelength laser SQUID microscope

Masahiro Daibo, Toshio Kikuchi, Masahito Yoshizawa

Proc. Applied Superconductivity Conference (ASC2002)     1ED07   2002年08月

その他（含・紀要）  共著・分担

Non-contact Evaluation of Semiconductors using a Laser SQUID Microscope

Masahiro DAIBO, Arimitsu SHIKODA, Masahito YOSHIZAWA

Physica C   372-376   263-266   2002年01月

学術誌  共著・分担

Non-contact evaluation of semiconductors using a laser SQUID microscope

Masahiro Daibo, Arimitu Shikoda, Masahito Yoshizawa

Proc. 5th European Conference on Applied Superconductivity (EUCAS2001)     E1.2-08   2001年08月

その他（含・紀要）  共著・分担

産業用実時間３次元ＣＴの画像再構成プロセッサ

田山典男，杜海清，大坊真洋

計測自動制御学会誌「計測と制御」   40 ( 12 ) 907-910   2001年01月

学術誌  共著・分担

Photo-induced Magnetic Field Imaging of p-n Junction using Laser SQUID Microscope

Masahiro DAIBO, Tadashi KOTAKA, Arimitsu SHIKODA

Physica C   357-360   1483-1487   2001年01月

学術誌  共著・分担

Novel Laser SQUID Microscope for High-resolution Magnetic Imaging

Masahiro Daibo, Tadashi Kotaka and Arimitsu Shikoda

Proc. The 13th International Symposium on Superconductivity (ISS2000)     EDP-3   2000年01月

その他（含・紀要）  共著・分担

Development of Computed 3D Imaging System from a Few Projection

N.Tayama, Haiqing Du, M. Daibo, T.Hasegawa

Proc. IASTED International Conferences SIP'99     119 - 1238   1999年01月

その他（含・紀要）  共著・分担

計算機ホログラムとＸ線計算機断層法を統合した３次元可視化

大坊真洋，田山典男

電子情報通信学会論文誌   J82-D-Ⅱ ( 9 ) 1420-1428   1999年01月

その他（含・紀要）  共著・分担

傾斜スキャンによるX線投影データ取込みと３次元画像再構成の実験

田山典男，加藤弘典，大坊真洋，長谷川辰雄，杜海清，栗田宏明

画像電子学会論文誌   28 ( 2 ) 152-160   1999年01月

学術誌  共著・分担

円弧状の線刻による立体ディスプレイ

大坊真洋，小林正信，町田俊一，木村光照

日本デザイン学会誌研究論文集「デザイン学研究」   46 ( 1 ) 19-26   1999年01月

学術誌  共著・分担

Visualization of x-ray computer tomography using computer generated holography

Masahiro Daibo, Norio Tayama

SPIE proc.   3457   134 - 145   1998年01月

その他（含・紀要）  共著・分担

A Computed Imaging System Using Wavelets Sampling Model

Haiqing Du, Norio Tayama, Masahiro Daibo, Tatuo Hasegawa, Kyosiro Seki

MVA'98 Machine Vision Applications     115 - 118   1998年01月

その他（含・紀要）  共著・分担

Developments of CT System Using Singular Value Decomposition Method

Masahiro Daibo, Tomeo Minamihaba, Tatsuo Hasegawa, Takami Kumagai, Mitsuru Fujisawa, Norio Tayama

S/CAR96 Computer Applications to Assist Radiology     475 - 476   1998年01月

その他（含・紀要）  共著・分担

２次元標本化モデルと特異値分解によるＸ線ＣＴ画像再構成アルゴリズム

大坊真洋，田山典男，長谷川辰雄，南幅留男

計測自動制御学会論文集   34 ( 12 ) 1937-1944   1998年01月

その他（含・紀要）  共著・分担

A Miniture Opto-Electric Transformer

Mitsuteru Kimura, Nobuki Miyakoshi and Masahiro Daibou

Proc. IEEE Micro Electro Mechanical Systems MEMS '91     227 - 232   1991年01月

その他（含・紀要）  共著・分担

薄膜光電トランス

宮腰宣樹，佐藤雄一，大坊真洋，木村光照

日本応用磁気学会誌   15 ( 2 ) 575-578   1991年01月

学術誌  共著・分担