Takahiro Oyama

Magnetic Susceptibility Measurement To Recognize Geological Characteristics of Rocks : An Example From the Crustal Section in the Northeast of the Yakuno Ophiolite, Japan

Shinya Wada, Takafumi Kimura, Takahiro Oyama, Shigeyuki Suzuki et autres

岩石の帯磁率は含有される強磁性鉱物の種類，量，粒径などと相関することで知られ，簡便な装置により非破壊で測定できるため，岩石の地質学的特徴を迅速に把握する際に活用できると期待される．一方で，帯磁率は多様な指標に対して感度を有するが故に，測定対象が複数の特徴を有する場合，その特徴が重なり合ってしまうことがある．これを克服できれば，幅広い現場での情報収集作業に貢献があるが，そのような検討事例は乏しい．本研究では，大島半島北部で実施された大深度ボーリングのコア試料を使用して，夜久野オフィオライトの地殻セクションの帯磁率を連続的に測定し，帯磁率から複合的な地質学的特徴がどのように把握できるか検討した．岩石の組織観察，鉱物モード組成分析，X線CT撮影，ポータブルXRF測定から検証した結果，地質境界や変質の影響がセンチメートルスケールの帯磁率の変化に反映され，玄武岩類の化学組成がメートルスケール以上の帯磁率の変化に反映されることが明らかとなった．本研究で議論された帯磁率の絶対値や変化のスケールに着目して複合的な地質学的特徴を把握する手法は，多様な現場の野外調査やコア記載において，応用されることが期待される．

jp (code pays fourni par la source)

Measurement of neutron spectra for various thicknesses of concrete and steel shielding at 24-GeV/c proton beam facility using Bonner sphere spectrometer

Tetsuro Matsumoto, Akihiko Masuda, Eunji Lee, Toshiya Sanami et autres

Neutron energy spectra down to thermal energy were measured using a Bonner sphere spectrometer (BSS) for various thicknesses of concrete and steel shielding at the CERN/CHARM facility, where high-energy neutrons were produced by 24-GeV/c protons incident on a thick copper target. The …

jp, ch (code pays fourni par la source)

Measurement and simulations of high-energy neutrons through a various thickness of concrete and steel shields using activation detectors at CHARM and CSBF

Noriaki Nakao, Toshiya Sanami, Tsuyoshi Kajimoto, Hiroshi Yashima et autres

A shielding experiment using activation detectors was performed at the CERN High-energy AcceleRator Mixed-field (CHARM) facility and the CERN Shielding Benchmark Facility (CSBF). The protons (24 GeV/c) were bombarded into a 50-cm-thick copper target, and the released neutrons were transmitted through various …

jp, ch (code pays fourni par la source)

Benchmark Experiments for Bulk and Maze Shielding Using Activation Detectors with 24-GeV/c Protons at CERN/CHARM

Noriaki Nakao, Toshiya Sanami, Tsuyoshi Kajimoto, Robert Froeschl et autres

Measurements of high-energy neutrons through shield penetration and maze streaming were performed at the Conseil Européen pour la Recherche Nucléaire (CERN) High-energy Accelerator Mixed-Field (CHARM) facility. The protons of 24 GeV/c were injected onto a 50-cm-thick copper target and the released neutrons …

jp, ch, de (code pays fourni par la source)

Evaluation of Posterior Ligamentous Complex Injury in Thoracolumbar Burst Fractures: Correlation Analysis of CT and MRI Findings

Satoshi Yoshikawa, Yusuke Nishimura, Yoshitaka Nagashima, Hiroshi Ito et autres

The goal of this study is to perform correlation analysis of Computed tomography (CT) and magnetic resonance imaging (MRI) results in posterior ligament complex (PLC) injury and define the morphological traits of thoracolumbar (TL) burst fractures connected to PLC injury. Forty patients …

jp, ca (code pays fourni par la source)

LABORATORY MEASUREMENT OF MILLIMETER-WAVE TRANSITIONS OF 13CH2DOH FOR ASTRONOMICAL USE

Takahiro Oyama, Nami Sakai, Takeshi Sakai, Riouhei Nakatani et autres

GAS-PHASE CH-OVERTONE BAND SPECTRA OF METHYL ACETATE AND ETHYL ACETATE VIA INCOHERENT BROAD-BAND CAVITY-ENHANCED ABSORPTION SPECTROSCOPY

Mitsunori Araki, Koichi Tsukiyama∥, Shoma Hoshino, Takahiro Oyama et autres

Biogenic Manganese Crust and Zinc Uptake in the River mixed with Groundwater

Yuki Ito, Takahiro Oyama, Shin‐ichi Hirano, Shiro Tanaka et autres

jp (code pays fourni par la source)

Two cases of solitary fibrous tumor/hemangiopericytoma with different clinical features according to the World Health Organization classification: case report and review of the literature

Tomoya Nishii, Yoshitaka Nagashima, Yusuke Nishimura, Hiroshi Ito et autres

Abstract: Solitary fibrous tumors (SFTs) and hemangiopericytomas (HPCs) have been classified as one entity by the World Health Organization in 2016 due to gene fusion between NAB2 and STAT6. In the Central Nervous System (CNS), a hypocellular, collagenized tumor with a classic …

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Measurements and Characterization of Air Activation in J-PARC Main Ring

Takahiro Oyama, Seiji Nagaguro, Masayuki Hagiwara, Hajime Nakamura et autres

jp (code pays fourni par la source)

Measurements and Monte Carlo simulations of high-energy neutron streaming through the access maze using activation detectors at 24 GeV/c proton beam facility of CERN/CHARM

Noriaki Nakao, Tsuyoshi Kajimoto, Toshiya Sanami, Robert Froeschl et autres

A measurement of high-energy neutron streaming was performed through a maze at the CERN (Conseil Européen pour la Recherche Nucléaire) High-energy AcceleRator Mixed-field (CHARM) facility. The protons of 24 GeV/c were injected onto a 50-cm-thick copper target and the released neutrons were …

jp, ch, us (code pays fourni par la source)

Measurements of secondary-particle emissions from copper target bombarded with 24-GeV/c protons

Takahiro Oyama, Toshiya Sanami, Hiroshi Yashima, Masayuki Hagiwara et autres

To devise an activation technique for characterizing mixed radiation fields, secondary particles from a copper target irradiated by 24 GeV/c protons were measured at the CERN High-energy AcceleRator Mixed field facility (CHARM). Activation detector sets consisting of aluminum, niobium, indium, and bismuth, …

jp, ch (code pays fourni par la source)