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Photon Activation Analysis Using KUR-Linac

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Photon Activation Analysis Using KUR-Linac

作者： s.sekimoto N.Kinoshita K.Masumoto Y.Miyamoto s.shibata Tsukuba University High Energy Accelerator Research Organization(KEK) Japan Atomic Energy Agency

INTRODUCTION:Neutron activation analysis(NAA) has high sensitivity and accuracy especially for siderophile elements represented by iridium.However,sensitivity and accuracy for nickel in NAA using the research reactor which is dominated by thermal neutron are not so higher than those for iridium because nickel is determined by NAA using fast neutron induced reaction Ni(n,p)Co.In this work,the photon activation analysis (PAA) was adopted for the determination of trace amount

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Development of Prompt Gammma-Ray Analysis Apparatus in KURRI

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Development of Prompt Gammma-Ray Analysis Apparatus in KURRI

作者： s.sekimoto K.Hirose K.Takamiya R.Okumura Y.Kawabata Research Center for Electron Photon science Tohoku University

INTRODUCTION:Prompt gamma-ray analysis (PGA) apparatus has been developed in KURRI from 2008.This development is promoted by Nuclear Energy Research Initiative,Research Reactor and Hot Laboratory Utilization program,which is titled as "Improvement of Utilization on KUR and HL in KURRI",under the project in Ministry of Education,Culture,sports, science and Technology.In PGA,it is necessary to observe the gamma rays emitted promptly from the samples through neutron induced reaction.The neutron irradia-

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Production Rate of p Nuclei sm-146 via Pm-146 Using Bremsstrahlung

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Production Rate of p Nuclei Sm-146 via Pm-146 Using Bremsstr...

作者： N.Kinoshita K.Masumoto Y.Hamajima T.Ohtsuki K.Hirose H.Yashima s.sekimoto Tandem Accelerator Complex University of Tsukuba Radiation science Center KEK Low Level Radioactivity Laboratory Kanazawa University Laboratrory of Nuclear science Tohoku University

INTRODUCTION:The p process,which synthesizes the neutron-deficient nuclei,proceeds via photo-disintegration,γprocess,and rapid proton capture process,rp process,on existing heavy seed nuclei in the temperature of T = 2-3×10 K.The high temperature can be achieved in explosive environments, such as the O/Ne layers of TypeⅡsupernovae and deflagration flame fronts in TypeⅠsupernovae. Production rate by the photo-disintegration is expressed by the product of cross section and photon flux based

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Round Robin study on the Thermal Conductivity/Diffusivity of a Gold Wire with a Diameter of 30μm Tested via Five Measurement Methods

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Journal of Thermal science 2022年第4期31卷 1037-1051页

作者： ABE Ryo sekimoto Yuki sAINI shirkant MIYAZAKI Koji LI Qin-Yi LI Dawei TAKAHAsHI Koji YAGI Takashi NAKAMURA Masakazu division of materials science nara institute of science and technologyikoma 630-0192japan department of mechanical and control engineering kyushu institute of technologykitakyushu 804-8550japan department ofaeronautics and astronautics kyushu universityfukuoka819-0395japan international institute for carbon-neutral energy research(wpi-i2cner) kyushu universityfukuoka 819-0395japan national metrology institute of japan national institute of advanced industrial science and technology tsukuba 305-8565japan

since first establishing thermal measurement techniques for micrometer-scale wires,various methods have been devised and improved upon.However,the uncertainty of different measurements on the same sample has not yet been discussed.In this work,a round robin test was performed to compare the thermal conductivity and thermal diffusivity measurement methods for a fine metal wire.The tested material was a pure gold wire,with a diameter of 30μm.The wire was cut into certain lengths and distributed to four institutions using five different measurement methods:the direct current(DC)self-heating method,the DC heating T-type method,the 3ωmethod for thermal conductivity,the scanning laser heating alternating current(AC)method,and the spot periodic heating radiation thermometry method for thermal diffusivity.After completing the measurements,the reported thermal conductivity and thermal diffusivity at room temperature,i.e.,317 W·m^(-1)·K^(-1)and 128×10^(-6)m^(2)·s^(-1),respectively,were adopted as references for comparison with the measurement results.The advantages and disadvantages of each method are described in terms of the effect of electrical and thermal junctions fabricated on a wire,such as an electrode,a thermocouple,and a heat bath.The knowledge obtained from the tested methods will be useful for selecting and designing a measurement technique for various wire-like materials.

关键词： thermal conductivity thermal diffusivity round robin test microscale wire

Cross-section Measurements for Neutron-Induced Fission of Curium Isotopes

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Cross-Section Measurements for Neutron-Induced Fission of Cu...

作者： K.Hirose T.Ohtsuki N.Iwasa Y.shibasaki J.Hori s.sekimoto K.Takamiya H.Yashima K.Nishio Research Center for Electron Photon science Tohoku University Graduate school of science Tohoku University Japan Atomic Energy Agency

INTRODUCTION: In order to evaluate the feasibility of the transmutation or incineration of minor actinides in fast reactors and/or accelerator-driven subcritical systems,neutron-induced fission cross sections are indispensable.We have developed the multi-layered parallel plate ionization chamber (MLPPIC) for this purpose.In the present experiment, cross sections for the neutron-induced fission of curium isotopes,the third abundant minor actinide in the high level radioactive waste after neptunium and americium isotopes,were measured using the lead slowing-down

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Reversed portal flow: Clinical influence on the long-term outcomes in cirrhosis

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World Journal of Gastroenterology 2015年第29期21卷 8894-8902页

作者： Takayuki Kondo Hitoshi Maruyama Tadashi sekimoto Taro shimada Masanori Takahashi Osamu Yokosuka Department of Gastroenterology and Nephrology Graduate School of Medicine Chiba University

AIM: To elucidate the natural history and the longitudinal outcomes in cirrhotic patients with non-forward portal flow(NFPF).METHODs: The present retrospective study consisted of 222 cirrhotic patients(120 males and 102 females; age, 61.7 ± 11.1 years). The portal hemodynamics were evaluated at baseline and during the observation period using both pulsed and color Doppler ultrasonography. The diameter(mm), flow direction, mean flow velocity(cm/s), and mean flow volume(m L/min) were assessed at the portal trunk, the splenic vein, the superior mesenteric vein, and the collateral vessels. The average values from 2 to 4 measurements were used for the data analysis. The portal flow direction was defined as follows: forward portal flow(FPF) for continuous hepatopetal flow; bidirectional flow for to-and-fro flow; and reversed flow for continuous hepatofugal flow. The bidirectional flow and the reversed flow were classified as NFPF in this study. The clinical findings and prognosis were compared between the patients with FPF and those with NFPF. The median follow-up period was 40.9 mo(range, 0.3-156.5 mo).REsULTs: Twenty-four patients(10.8%) demonstrated NFPF, accompanied by lower albumin level, worse ChildPugh scores, and model for end-stage liver disease scores. The portal hemodynamic features in the patients with NFPF were smaller diameter of the portal trunk;presence of short gastric vein, splenorenal shunt, or inferior mesenteric vein; and advanced collateral vessels(diameter > 8.7 mm, flow velocity > 10.2 cm/s, and flow volume > 310 m L/min). The cumulative incidence rates of NFPF were 6.5% at 1 year, 14.5% at 3 years, and 23.1% at 5 years. The collateral vessels characterized by flow velocity > 9.5 cm/s and those located at the splenic hilum were significant predictive factors for developing NFPF. The cumulative survival rate was significantly lower in the patients with NFPF(72.2% at 1 year, 38.5% at 3 years, 38.5% at 5 years) than in those with forward portal flow(84.0% at 1 year, 67.8% at 3 years, 54.3% at 5 yea

关键词： Non-forward portal flow Reversed portalflow Cirrhosis Doppler ultrasound Portal hemodynamics

Comparative study of salinity Tolerance an Oceanic sea skater, Halobatesmicansand Its Closely Related Fresh Water species, Metrocorishistrio

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Natural science 2014年第14期6卷 1141-1148页

作者： Takero sekimoto Yuki Osumi Takashi shiraki Akane Kobayashi Kentaro Emi Mitsuru Nakajo Masatoshi Moku Vladimir Kostal Chihiro Katagiri Tetsuo Harada Laboratory of Environmental Physiology Graduate School of Integrated Arts and Sciences Kochi University Kochi Japan Atmosphere and Ocean Research Institute The University of Tokyo Tokyo Japan Institute of Entomology Biology Center of the Academy of Sciences CR Ceske Budejovice Czech Republic Division of Life science and Engineering School of Science and Engineering Tokyo Denki University Hatoyama-cho Japan

This study aims, first, to examine the limit for tolerance to lower salinity by an oceanic sea skater, Halobates micans, and , second, to make it clear whether exclusively fresh water Halobatinae species, Metrocoris histrio has salinity tolerance. Adults of H. micans were collected using Neuston Net from the starboard side of R/V MIRAI on a fixed station at 8°s, 80°E, whereas those of M. histrio were collected from a small pond filled with a spring fresh water in Kochi (33°N, 133°E), Japan. Time in survival was measured in starved condition under several salinity conditions: 0‰, 2‰, 4‰, 6‰, 8‰, 9‰ and 10‰ for H. micans;0‰, 5‰, 10‰, 12.5‰, 15‰ for M. histrio. Half of adults were in coma due to lower salinity under 10‰ and time in survival was less than 10 hours under less than 4‰ for H. micans. Time in survival was half at 5‰ of 80 hours on average at 0‰ as a control and less than 10 hours at 10‰ or higher salinity for M. histrio. Relatively flexible osmo-regulation ability by H. micans would be related to wide variety of salinity condition of surface oceanic water, whereas very limited tolerance even to lower salinity of 5‰ may be permitted by the no chances to be exposed to brackish water in natural habitats of M. histrio. This study showed that salinity tolerance of Halobatinae species would reflect, directly, the salinity condition of their habitats.

关键词： Oceanic sea skaters Fresh Water Halobates mican sand Its Closely Related Fresh Water species Metrocoris histrio