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Evaluation of SrBr₂ Hydration Reaction Rate with Repeated Cycling

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Journal of Materials Science and Chemical Engineering 2022年第2期10卷 53-61页

作者： Takehiro Esaki yuichi Sugai Department of Earth Resources Engineering Kyushu University Fukuoka Japan

In this study, we evaluated the SrBr2 hydration reaction rate on repeated cycling. It was estimated that hydrated SrBr2 particles were expanded by hydration and condensed to form secondary particles;thus, the hydration reaction was reduced by repeated cycles. Using volumetric methods, we examined the effect of repetition on the reaction rate for 900 cycles during hydration and dehydration and analyzed the reaction rate using the unreacted core-shell model. From the experimental and calculated results, we confirmed that reaction rate decreased and the sample particles formed secondary particles after 900 repeated cycles. By analyzing the unreacted core-shell model, we found that the coefficient of H2O diffusion in the particles exponentially decreased with increasing repeated cycles. The value of the diffusion coefficient after 900 cycles was five times lower than that of the first cycle. To achieve stable repeated hydration cycles, technology to control the formation of secondary particles must be investigated.

关键词： SrBr2 Hydration Repetition Cycle The Coefficient of Particle Diffusion

Development of an ONU Using a Reflective Semiconductor Optical Amplifier Transmitter and Its Transmission Characteristic

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光学学报 2003年第S1期23卷 609-610页

作者： Akira Ohki Rieko Sato Yasuo Shibata yuichi Tomori Munenori Mizuta Yasuhiro Suzuki NTT Photonics Laboratories 3-1 Morinosato Wakamiya Atsugi-shi Kanagawa Pref. 243-0198 Japan

We propose a WDM-PON system as one of the promising candidates for next generation high capacity, cost-effective and inter-operable optical access network system and develop an ONU using reflective SOA transmitter for... 详细信息

关键词： optical access network high capacity

Low Power Penalty Operation of a Wide Input Dynamic Range Cross-Phase Modulation Wavelength Converter

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光学学报 2003年第S1期23卷 353-354页

作者： Jun Endo Akira Ohki Rieko Sato Toshio Ito yuichi Tohmori Yasuhiro Suzuki NTT Photonics Laboratories NTT Corporation 3-1 Morinosato Wakatniya Atsugi-shi Kanagawa Pref. 243-0198 Japan

We successfully demonstrated low power penalty operation of a cross-phase modulated (XPM) wavelength converter using a semiconductor optical amplifier (SOA) power equalizer. We also clarified the SOA equalizing level for more adaptive wavelength conversion and achieved a power penalty of less than 1 dB over the wide input dynamic range of 15 dB.

关键词： Wavelength Converter Dynamic Range power penalty wavelength conversion optical amplifier range of

Fulminant amebic colitis in a patient with concomitant cytomegalovirus infection after systemic steroid therapy:A case report

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World Journal of Clinical Cases 2021年第15期9卷 3726-3732页

作者： Naoki Shijubou Toshiyuki Sumi Koki Kamada Takeyuki Sawai yuichi Yamada Tatsuru Ikeda HisashiNakata Yuji Mori Hirofumi Chiba Department of Respiratory Medicine Hakodate Goryoukaku HospitalHakodate 040-8611Japan Department of Respiratory Medicine and Allergology Sapporo Medical University School of MedicineSapporo 060-8556Japan Department of Pathology and Diagnosis Hakodate Goryoukaku HospitalHakodate 040-8611Japan

BACKGROUND Amebic colitis is an infection caused by Entamoeba histolytica and most commonly observed in regions with poor *** is also seen as a sexually transmitted disease in developed *** amebic colitis usually has a chronic course with repeated exacerbations and remissions,it may also manifest as a fulminant form that rapidly progresses and leads to severe,life-threatening complications,such as intestinal perforation,peritonitis,and sepsis,that have a high mortality *** SUMMARY A 68-year-old man was admitted to our hospital with chest pain and acute *** was diagnosed with acute coronary syndrome,acute heart failure,and bacterial *** respiratory condition worsened despite receiving intensive care and intravenous *** the fifth day of hospitalization,he was diagnosed with acute respiratory distress syndrome and was started on steroid *** subsequently developed bloody stools and was diagnosed with cytomegalovirus(CMV)enterocolitis based on biopsy results and a peripheral blood CMV pp65 antigenemia test *** we started antiviral therapy with ganciclovir,which was successful in reducing his antigen titers,he continued to have bloody *** weeks after initiation of ganciclovir therapy and six weeks after his admission,the patient died from intestinal *** only posthumously diagnosed him with amebic colitis and CMV enterocolitis based on autopsy findings of transmural necrosis of the entire colon with massive ameba *** We urge clinicians to consider Entamoeba histolytica infection if severe colitis progresses after steroid *** treatment is recommended then.

关键词： Amebiasis Intestinal Colitis Cytomegalovirus Glucocorticoids Perforation Case report

Influence of Post-annealing in N2 on Structure and Electrochemical Characteristics of LiNi0.5Mn1.5O4

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Chemical Research in Chinese Universities 2013年第2期29卷 329-332页

作者： HE Shi-ci ZHANG Qian LIU Wei-wei FANG Guo-qing SATO yuichi ZHENG Jun-wei LI De-cheng Institute of Chemical Power Sources Soochow University Suzhou 215006 P. R. China Department of Applied Chemistry Faculty of Engineering Kanagawa University Yokohama 221-8686 Japan

LiNi0.5Mn1.504 prepared by a spray drying method was re-treated in N2 at 500, 600 and 700℃, respec- tively. Their structural and electrochemical properties were studied by means of Fourier transform infrared（FTIR）, X-ray diffraction（XRD）, and charge-discharge tests. The space group of the ***.504 transforms from P4332 to Fd3m at an annealing temperature of 700℃. The electrochemical characteristics of the treated samples are closely related to the annealing temperature. The sample treated in N2 at 500℃ shows both an improved rate capability and cyclic performance at a high temperature compared with the as-prepared sample, while the sample treated in N2 at 700℃ shows dramatically decrease in its reversible capacity.

关键词： Li-ion battery Cathode material LiNio.sMnl.504 Structural and electrochemical property

A Theoretical Study on Van Der Pauw Measurement Values of Inhomogeneous Compound Semiconductor Thin Films

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Journal of Modern Physics 2010年第5期1卷 340-347页

作者： Toru Matsumura yuichi Sato 不详

The influence of intermixing heterogeneous regions that have different electrical properties from the base materials on van der Pauw measurement values was theoretically studied by computer simulation using the finite-element method. The measurement samples selected were thin films of inhomogeneous semiconductors. Calculated electrical properties, such as resistivity, carrier density, and mobility of the thin films, varied in predictable ways when heterogeneous regions were dispersed in wide ranges over the samples. On the other hand, the mobility of the thin films showed a different change when heterogeneous regions were locally concentrated in the measurement samples.

关键词： Semiconductor Hall Effect Van Der Pauw Method Inhomogeneous Semiconductor

Direct Measurement of Medical Linear Accelerator Electron Beam Width at Scattering Foil Position

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2017年第1期6卷 1-7页

作者： Tomohiro Shimozato yuichi Aoyama Department of Radiological Technology School of Health Science Gifu University of Medical Science Gifu Japan Department of Radiotherapy Kobe University Hospital Kobe Japan

Purpose: The aim of this study was to develop a method for the direct measurement of electron beam width and distribution at the scattering foil on the carrousel in a medical linear accelerator gantry head, which differs from an existing indirect method for measuring the focal spot size using a camera or metallic slit located outside the gantry head. Methods: The electron beam emitted by the linear accelerator was used to irradiate radiochromic film mounted on the scattering foil on the carrousel, which was not used for clinical treatment. The electron beam width at the scattering foil position was then evaluated using the full width at half maximum of the Gaussian distribution approximated from each one dimensional distribution of the irradiated radiochromic film. Results: The electron beam width at the scattering foil position was found to be 3.1 to 6.4 mm in the crossline direction and 2.8 to 5.5 mm in the inline direction with electron energy of 4 to 16 MeV. The two-dimensional distribution of the electron beam was therefore elliptical or distorted in shape, not circular. Conclusions: Direct measurement of the electron beam width at the scattering foil in the carrousel of a medical linear accelerator is possible, though the use of lower sensitivity film in addition to indirect methods is expected to bring about better results. However, as this method does not allow for direct measurement of the incident angle of the accelerated electron beam, further improvements and refinements are still needed.

关键词： Medical Linear Accelerator Electron Beam Distribution Radiochromic Film Scattering Foil

Stability Analysis of Cliff Face around Kegon Falls in Nikko, Eastern Japan: An Implication to Its Erosional Mechanisms

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International Journal of Geosciences 2013年第6期4卷 8-16页

作者： yuichi S. Hayakawa Center for Spatial Information Science The University of Tokyo Chiba Japan

A waterfall highlights the locus of active fluvial erosion of bedrock, and its mechanism has been the subject of several studies;however, erosional processes remain to be clarified for specific rock structures composing a waterfall. Herein, the detailed morphology of cliffs around a waterfall is examined by a terrestrial laser scanning (TLS) approach to analyze erosional processes occurring in the cliffs. The study site is Kegon Falls in Japan, which has a vertical drop of surface water from the top of its cliff and groundwater outflows from its lower portion. The entire cliff is mostly overhanging and minor rockfalls are often observed. The latest major rockfall occurred in 1986, causing an approximate 8-m upstream shift of the waterfall lip. From the point cloud obtained by TLS measurement, a digital elevation model on a vertical plane was generated, and cross-sectional profiles were extracted. A distinct 5- to 10-m depression was found at the bottom of the upper andesite layer of the waterfall cliff, which appears to have been formed by freeze-thaw and wet-dry weathering following the upstream shift of the surface water drop. Stability analysis of the waterfall cliff with an undercutting notch indicates that the igneous rock composing the cliff is sufficiently strong to maintain its current overhanging shape and that catastrophic collapse of the entire waterfall face rarely occurs. Following the formation of the depression, the upper cliff face appears to have been gradually eroded by gravitational collapses of relatively small blocks bounded by columnar and platy joints.

关键词： Bedrock Erosion Knickpoint Waterfall Recession Terrestrial Laser Scanning

MK-0626,a selective DPP-4 inhibitor,attenuates hepatic steatosis in ob/ob mice

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World Journal of Gastroenterology 2014年第43期20卷 16227-16235页

作者： Tatsuya Ohyama Ken Sato yuichi Yamazaki Hiroaki Hashizume Norio Horiguchi Satoru Kakizaki Masatomo Mori Motoyasu Kusano Masanobu Yamada Department of Medicine and Molecular Science Gunma University Graduate School of MedicineGunma 371-8511Japan Department of Endoscopy and Endoscopic Surgery Gunma University HospitalGunma 371-8511Japan

AIM: To investigate the mechanism and in vivo effects of MK-0626, a dipeptidyl peptidase-4 inhibitor, on hepatic steatosis using ob/ob mice.

关键词： Dipeptidyl peptidase-4 inhibitor Hepatic steatosis ob/ob mice AMP-activated protein kinase Microsomal triglyceride transfer protein Adiponectin