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Hydrogen Oxidation Reaction on different Pt core-shell catalysts in Alkaline Electrolyte

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Hydrogen Oxidation Reaction on different Pt core-shell catal...

Vulcan/Pt/Ce Catalysts Prepared by Impregnation Using EDTA for Direct Methanol Fuel Cell,Direct Ethanol Fuel Cell,and Polymer Electrolyte Membrane Fuel Cell

中国化学会第三届中国能源材料化学研讨会

作者： Jue Hu Kurian A.Kuttiyiel kotaro sasaki Chengxu Zhang Radoslav R.Adzic Kunming University of Science and Technology Chemistry Department Brookhaven National Laboratory

Hydrogen,which produces water as the only product during its oxidation reaction,is established as one of the most likely fuels of the future .Hydrogen oxidation reaction(HOR) as the key reaction in hydrogen-oxygen fuel cell has been widely investigated,and ultra low loading Pt(≤0.05 mg cm) is required for HOR in proton exchange membrane fuel ***,the HOR and HER(hydrogen evolution reaction) kinetics becomes sluggish in base,

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来源： cnki会议评论

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Smart Grid and Renewable Energy 2013年第7期4卷 1-9页

作者： Rolando Guzmán-Blas Christian L.Menéndez Carlos A.Vélez Estevao Rosim Fachini Aaron Johnston-Peck Sanjaya D.Senanayake Dario Stacchiola kotaro sasaki Carlos R.Cabrera NASA-University Research Centers for Advanced Nanoscale Materials Department of Chemistry and PhysicsUniversity of Puerto RicoRio Piedras CampusSan JuanUSA Chemistry Graduate Program University of Puerto RicoRio Piedras CampusSan JuanUSA General Studies College Physical Sciences DepartmentUniversity of Puerto RicoRio Piedras CampusSan JuanUSA Center for Functional Nanomaterials Brookhaven National LaboratoryUptonUSA Chemistry Department Brookhaven National LaboratoryUptonUSA

A wet chemistry synthesis of Pt-Ce doped catalysts on carbon Vulcan support using an impregnation method with EDTA is presented. The composite catalyst was characterized by XRD, XPS and TEM. The catalytic activity of the prepared material was tested in a direct fuel cell using methanol, ethanol and hydrogen as fuels. The polarization and power curves showed that the Vulcan/Pt/Ce(III) doped catalysts improved the performance of the fuel cells when compared with Vulcan-Pt anode materials.

关键词： Cerium Fuel Cell Pt Methanol Ethanol Hydrogen

The Effect of Treatment Position on Rectal and Bladder Dose-Volume Histograms for Prostate Radiotherapy Planned with 3-Dimensional Conformal Radiotherapy, Intensity-Modulated Radiotherapy and Volumetric Modulated Arc Therapy

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2014年第2期3卷 88-97页

作者： kotaro Terashima Katsumasa Nakamura Tomonari sasaki Saiji Ohga Tadamasa Yoshitake Kazushige Atsumi Makoto Shinoto Kaori Asai Keiji Matsumoto Hidenari Hirata Yoshiyuki Shioyama Akihiro Nishie Hiroshi Honda Department of Clinical Radiology Graduate School of Medical Sciences Kyushu University Fukuoka Japan Department of Radiology Kyushu University Hospital at Beppu Beppu Japan Kyushu International Heavy Ion Beam Therapy Center Tosu Saga Japan

Purpose: To compare target coverage and organ at risk (OAR) sparing in the supine and prone positions with 3-dimensional conformal radiotherapy (3DCRT), intensity-modulated radiotherapy (IMRT) and volumetric modulated arc therapy (VMAT) in low- and high-risk prostate radiotherapy cases. Materials and Methods: Using magnetic resonance images of five healthy volunteers, six treatment plans (supine 3DCRT, prone 3DCRT, supine IMRT, prone IMRT, supine VMAT and prone VMAT) were generated. Planning target volume 1 (PTV1) was defined as the prostate gland plus the seminal vesicles with adequate margins in a high-risk setting, while PTV2 was defined as prostate only with margins in a low-risk setting. The mean dose for both PTV1 and PTV2 was set at 78 Gy. Plans generated by each of the 3 techniques were compared between the supine and prone positions using dose-volume histograms (DVHs). Results: For PTV1, prone 3DCRT provided a significantly higher D98% than did supine 3DCRT, and its homogeneity index (HI) was significantly better. IMRT and VMAT values did not differ significantly between the prone and supine positions. For PTV2, no values differed significantly between the supine and prone positions under any treatment plan. With respect to OAR, the rectal D mean, D2%, V50, and V60 values of PTV1 were statistically higher in supine 3DCRT than in prone 3DCRT, while there were no significant differences in rectal values between the supine and prone positions with IMRT or VMAT. The rectal Dmean, V50, V60, V70, and V75 values of prone 3DCRT were significantly higher than those of supine IMRT or supine VMAT. There were no significant differences in any values for the rectum and bladder for PTV2. Conclusion: Although prone 3DCRT was found to be superior to supine 3DCRT in terms of rectal sparing in high-risk prostate cancer, IMRT and VMAT techniques could possibly cover this disadvantage.

关键词： Prostate Radiotherapy Dosimetric Comparison 3DCRT IMRT VMAT

Condyloma acuminatum of the anal canal,treated with endoscopic submucosal dissection

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World Journal of Gastroenterology 2016年第8期22卷 2636-2641页

作者： Akiko sasaki Takeshi Nakajima Hideto Egashira kotaro Takeda Shinnosuke Tokoro Chikamasa Ichita Sakue Masuda Haruki Uojima Kazuya Koizumi Takeshi Kinbara Taku Sakamoto Yutaka Saito Makoto Kako Gastroenterology Medicine Center Shonan Kamakura General Hospital 1370-1 Okamoto Kamakura Endoscopy Division National Cancer Center Hospital5-1-1 Tsukiji Chuoku Diagnostic Pathology Shonan Kamakura General Hospital 1370-1 Okamoto Kamakura

Condyloma acuminatum(CA) is a common sexually transmitted disease caused by human papilloma virus infection. Not all individuals develop persistent, progressive disease, but careful follow up is required with moderate-to-severe dysplasia to prevent progression to malignancy. Standard therapies include surgical treatments(trans-anal resection and transanal endoscopic microsurgery) and immunotherapeutic and topical methods(topical imiquimod); however, local recurrence remains a considerable problem. Here, we report a case with superficial CA of the anal canal, treated with endoscopic submucosal dissection(ESD). A 28-year-old man presented with a chief complaint of hematochezia. Digital exam did not detect a tumor. Screening colonoscopy revealed 10-mm long, whitish condyles extending from the anal canal to the lower rectum. The lesion covered almost the whole circumference, and only a small amount of normal mucosa remained. Magnifying endoscopy with narrow band imaging showed brownish hairpin-shaped, coiled capillaries. Although histopathological diagnosis by biopsy revealed CA, accurate histological differentiation between CA, papilloma, and squamous cell carcinoma can be difficult with a small specimen. Therefore, weperformed diagnostic ESD, which provides a complete specimen for precise histopathological evaluation. The pathological diagnosis was CA, with moderate dysplasia(anal intraepithelial neoplasia 2). There was no recurrence at 16 mo after the initial ESD. Compared to surgical treatment, endoscopic diagnosis and resection could be performed simultaneously and the tumor margin observed clearly with a magnifying chromocolonoscopy, resulting in less recurrence. These findings suggest that endoscopic resection may be an alternative method for CA that prevents recurrence.

关键词： Condylomata acuminate Recurrence Endoscopy Dissection Carcinoma in situ