A Case of Acute Eosinophilic Pneumonia Associated with Heated Rubber Fume Exposure

ABSTRACTBackgroundWe report a rare case of acute eosinophilic pneumonia (AEP) associated with heated rubber fume exposure.MethodsA 31-year-old Ethiopian man, working at a rubber plant, was admitted to our hospital because of refractory dyspnea and fever. Computed tomography of the chest showed bilateral interstitial shadows and pleural effusion. We suspected AEP and performed fiberoptic bronchoscopy.ResultsThe eosinophil fraction was elevated at 59% in the bronchoalveolar lavage fluid (BALF). From the history of inhalation of heated rubber at the working place and hypereosinophilic counts in the BALF, he was given a diagnosis of AEP associated with heated rubber fume exposure. His symptoms and chest radiographic findings were drastically improved by corticosteroid therapy.ConclusionsHeated rubber fume can be a causative substance for AEP. In similar situations, physicians should consider AEP and order various examinations for confirmation

Performance of Multi-Pixel Photon Counters for the T2K near detectors

We have developed a Multi-Pixel Photon Counter (MPPC) for the neutrino detectors of T2K experiment. About 64,000 MPPCs have been produced and tested in about a year. In order to characterize a large number of MPPCs, we have developed a system that simultaneously measures 64 MPPCs with various bias voltage and temperature. The performance of MPPCs are found to satisfy the requirement of T2K experiment. In this paper, we present the performance of 17,686 MPPCs measured at Kyoto University.Comment: 15 pages, 14 figure

Angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo1.73Fe0.27B2

We have performed angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo1.73Fe0.27B2 (Tc = 4.1 K), which is isostructural to the 122-type Fe-pnictide superconductor with the pnictogen atom being replaced with boron. We found that the Fermi level is located at a dip in the density of states (DOS) in contrast to Co-pnictide ferromagnets. This reduction in DOS together with the strong Co 3d-B 2p covalent bonding removes the ferromagnetic order and may cause the superconductivity. The energy bands near the Fermi level show higher three dimensionality and a weaker electron-correlation effect than those of Fe pnictides. The Fermi surface topology is considerably different from that of Fe pnictides, suggesting the difference in the superconducting mechanism between boride and pnictide superconductors.Comment: 5 pages, 4 figure

Polarization Measurement for Fast Neutrons by a Liquid-Helium Scintillation Detector

開始ページ、終了ページ: 冊子体のページ付

Coupling of giant resonances to soft E1 and E2 modes in B-8

The dynamic coupling between giant resonance states and "soft", low-energy excitation, modes in weakly-bound nuclei is investigated. A coupled-channels calculation is reported for the reaction 8B + Pb --> p + 7Be + Pb at 83 MeV/nucleon. It is shown that the low-energy response is only marginally modified by transitions to the isovector giant dipole and isoscalar giant quadrupole resonances.Comment: 8 pages, 2 figure

Possible nodal superconducting gap emerging at the Lifshitz transition in heavily hole-doped Ba0.1K0.9Fe2As2

We performed a high energy resolution ARPES investigation of over-doped Ba0.1K0.9Fe2As2 with T_c= 9 K. The Fermi surface topology of this material is similar to that of KFe2As2 and differs from that of slightly less doped Ba0.3K0.7Fe2As2, implying that a Lifshitz transition occurred between x=0.7 and x=0.9. Albeit for a vertical node found at the tip of the emerging off-M-centered Fermi surface pocket lobes, the superconducting gap structure is similar to that of Ba0.3K0.7Fe2As2, suggesting that the paring interaction is not driven by the Fermi surface topology.Comment: 5 pages, 4 figure

J-PARCにおけるベータ崩壊の計数による中性子寿命の測定

学位の種別: 課程博士審査委員会委員 : （主査）東京大学教授 齊藤 直人, 東京大学教授 小関 忠, 東京大学教授 酒見 泰寛, 東京大学准教授 森松 治, 東京大学教授 駒宮 幸男University of Tokyo(東京大学