A5102924634- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Aerosol Filtration and Electrostatic Precipitation
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Electrohydrodynamics and Fluid Dynamics
- Particle Dynamics in Fluid Flows
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Cyclone Separators and Fluid Dynamics
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- High voltage insulation and dielectric phenomena
- Medical Imaging Techniques and Applications
- Electrostatics and Colloid Interactions
- CCD and CMOS Imaging Sensors
- Electrical and Bioimpedance Tomography
- Electrostatic Discharge in Electronics
- Microfluidic and Bio-sensing Technologies
- Fuel Cells and Related Materials
Rikkyo University
2017-2025
PHENIX laboratory
2023
Bhabha Atomic Research Centre
2023
Banaras Hindu University
2023
Charles University
2023
Augustana University
2023
The University of Tokyo
1988-2021
University of Tsukuba
2020
Kobe Gakuin University
2009-2011
Lancaster University
2003
This paper describes the design, construction, and initial operation of SLD's upgraded vertex detector which comprises 96 two-dimensional charge-coupled devices (CCDs) with a total 307 Mpixel. Each pixel functions as an independent particle detecting element, providing space point measurements charged tracks typical precision 4 μm in each co-ordinate. The CCDs are arranged three concentric cylinders just outside beam-pipe surrounds e+e− collision SLAC Linear Collider (SLC). is powerful tool...
We searched for possible signatures of top-quark production in 508 ${e}^{+}{e}^{\ensuremath{-}}$ hadronic annihilation events collected at $\sqrt{s}=52$ GeV by the TOPAZ detector KEK collider TRISTAN. The observed cross section and shape are consistent with standard-model predictions without top quarks. A lower limit (95% confidence level) on mass lightest meson is set 25.8 GeV.
The central drift chamber (CDC) of the Stanford Linear Collider Large Detector (SLD) has been recording data since 1992. low mass and use a gas characterized by both velocity diffusion constant help to minimize multiple scattering drift-distance measurement errors. We describe some calibrations corrections applied data, report on resolutions achieved thus far. measure an intrinsic resolution 55–110 μm in region uniform field. Analysis full drift-pulse waveform allows for efficient double-hit...
Swallowing disorders are a serious health concern among older adults. Previous studies reported that sarcopenia may affect swallowing disorders; however, whether is related to the capacity swallow (measured according speed) in community-dwelling adults unclear.The aim of this study was investigate relationship between and women.This cross-sectional observational conducted women Japan. The inclusion criteria were as follows: aged ≥65 years, with ability walk independently, without dysphagia....
We report for the first time on performance of Central Drift Chamber (CDC) Stanford Linear Collider Large Detector (SLD), which has been recording data since 1992. The low mass chamber and use a gas characterized by both drift velocity diffusion constant help to minimize drift-distance measurement errors. describe some calibrations corrections applied data, resolutions achieved thus far. measure an intrinsic resolution 55-110 /spl mu/m in region uniform field. Analysis full drift-pulse...
円筒流路を用いて空気流による粒子の再飛散に関する実験的検討を行った.完全分散されたフライアッシュ・エアロゾル粒子は粒子沈着により流路の内壁面に粒子層を形成する.その後, 粒子は空気流速が段々増加することにより再飛散する.この再飛散現象はテレビモニターにより観察され, ビデオテープに録画された.その結果, 再飛散は沈着粒子層の構造に大きく依存することがわかった.粒子層の充填率が小さいほど, あるいは表面粗さが大きいほど粒子は凝集体として飛散しやすい.飛散限界速度は充填率および表面粗さによってにく相関できた.さらに, 粒径の小さい凝集粒子ほど飛散は起こりにくいことがわかった.再飛散する最小凝集粒子の粒径 (限界粒子径) は空気流による分離力の最大値に対応する.この限界粒子径は粒子層の初期の表面粗さに反比例し, 空気流速の増加とともに指数関数的に減少する.これらの実験結果は凝集粒子に対する流体抵抗力と粒子層引張り破断強さのつり合いを仮定した解析によって定性的に説明された.
粉体の電荷緩和特性が粉体の摩擦帯電にどのような影響を与えるのかについて, フェライトコアの表面にシリコーン樹脂をコーティングした粉体を作り, 異なる環境湿度下において回転容器内での帯電特性を測定し定量的に解析を行った.その結果, 試料粉体の最大摩擦帯電量の絶対値は相対湿度30%以下では湿度の増加とともに急激に減少し, 30%以上では比較的緩やかに変化することがわかった.また, 試料粉体および容器壁面の接触電位差はそれぞれ環境湿度に対して緩やかに変化したが, 試料粉体・容器壁面間の接触電位差は環境湿度によらず一定の値となることがわかった.最大摩擦帯電量は粉体層の見掛け抵抗率および誘電率の積より算出した通常の電荷緩和時定数を用いて推定できるが, 帯電特性曲線の傾向は大きく異なった.一方, 帯電特性曲線は接触電位差測定におけるゼロ点電位の変化から得られる電荷緩和時定数を用いることによって定量的に解析できることがわかった.
We have searched for new sequential heavy leptons L± in e+e− collisions at √s =52 GeV using the TOPAZ detector KEK storage ring TRISTAN. In collected data with an integrated luminosity of 3.6 pb−1, no evidence production has been observed. A lower mass limit is determined to be 25.5 GeV/c2 95% confidence level.Received 18 November 1987DOI:https://doi.org/10.1103/PhysRevD.37.1339©1988 American Physical Society
The SLD collaboration completed construction of a new CCD vertex detector (VXD3) in January 1996 and started data taking April with the system. VXD3 is an upgrade original detector, VXD2, which had successfully operated for three years. consists 96 large area CCDs, each having 3.2 million 20 μm × pixels. By reducing material lengthening lever arm, expected to improve secondary resolution by about factor two compared VXD2. three-layered structure enables stand-alone tracking without any...
粒子貯留部における湿度を変更可能な実験装置を作成し，接触帯電を利用した粒子の帯電量の測定および局所荷電されたターゲットへの静電沈着実験を行った．その結果，パイプ内における平均流速や粒子貯留部の湿度により平均帯電量をある程度制御できることがわかった．沈着初期において，慣性により粒子が沈着しない部分が発生し，その効果は，印加電圧が低いほど顕著に現れることがわかった．帯電粒子は，ターゲットの後縁付近および側縁付近から沈着し始め，時間の経過とともに，ターゲットの中央付近にも沈着し始める．この結果によって，沈着した帯電粒子群による電界強度の減少が示唆された．ターゲット面への粒子の平均沈着厚さは，時間の経過とともに増加し，やがて一定値に近づくことがわかった．また，その一定値に近づくまでの時間（沈着時定数）は印加電圧に依存しないことがわかった．ターゲット面への粒子沈着厚さ分布の指標としては，粒子沈着厚さの変動係数を用いた．その値は，時間の経過とともに減少し一定値に近づき，また，印加電圧が高いほど小さくなるものの，ある時間を越えるとほとんど変わらなくなることがわかった．さらに，粒子を沈着させるた...
In order to provide a standardized control for the data acquisition system of TOPAZ detector, Timing Server/Receiver scheme was developed. The entire is under Interrupt Control Section, which manages an integral operation in FASTBUS environment.