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Photon Activation Analysis Using kUR-Linac

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Photon Activation Analysis Using KUR-Linac

Evaluation of activated area in the electrostatic accelerator facilities

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 ***,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)*** this work,the photon activation analysis (PAA) was adopted for the determination of trace amount

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辐射防护 2021年第2期41卷 145-150页

作者： k.masumoto H.Matsumura T.Miura G.Yoshida A.Toyoda H.Nakamura k.Bessho T.Nakabayashi F.Nobuhara k.Sasa T.Moriguchi H.Tsuchida S.Matsuyama M.Matsuda A.Taniike High Energy Accelerator Research Organization TsukubaIbarakiJapan Japan Environmental Research Co. Ltd.ShinjukuTokyoJapan Tokyo Nuclear Service Co. Ltd.CountryTaitoTokyoJapan Univ.of Tsukuba TsukubaIbarakiJapan kyoto Univ. UjiKyotoJapan Tohoku Univ. SendaiMiyagiJapan Japan Atomic Energy Agency TokaiNakaIbarakiJapan kobe Univ. KobeHyogoJapan

In order to clear the activated area in electrostatic accelerator facilities,four accelerator facilities were selected and typical neutron emission experiments were *** flux during operation and induced activity caused by charged particles on the accelerator and its surrounding area after irradiation were *** the monitored neutron flux and calculated value by Monte Carlo calculation using PHITS code were *** was confirmed that the results between calculated data and measured data showed the good agreement with each ***,it was concluded that we have to take care the activation of beam line and ***,it is not necessary to treat accelerator tank,surrounding materials,and building concrete as radioactive materials in case of decommissioning.

关键词： Electrostatic accelerators Neutron measurement Activated area Decommissioning

Behavior of Colloidal Species Formed in the Cooling Water of Accelerator Facilities

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Behavior of Colloidal Species Formed in the Cooling Water of...

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

作者： k.Bessho H.Matsumura k.masumoto Y.Oki N.Osada N.kinoshita Radiation Science Center KEK Tandem Accelerator Complex University of Tsukuba

INTRODUCTION:In accelerator facilities,a management of cooling water is one of the important *** water was often contaminated with metal ions and colloids associated with radionuclides during operation. For example,Be-7 is produced by spallation reaction of oxygen in water and associated with metal oxide colloids at the high-energy and high-intensity ***, colloid-formation processes in water is not clearly *** this work,metals such as Fe,Cu and Al contacted with water were irradiated byγ-ray,bremsstrah-

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

Aqueous-phase reforming of hydroxyacetone solution to bio-based H_(2)over supported Pt catalysts

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 *** 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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Green Energy & Environment 2024年第4期9卷 777-788页

作者： A.k.k.Vikla k.koichumanova Songbo He k.Seshan Joint International Research Laboratory of Circular Carbon Nanjing Tech UniversityNanjing211816China Faculty of Science and Technology University of Twente7500 AE EnschedeThe Netherlands CoRe Pro 9723 BL GroningenThe Netherlands

Aqueous-phase reforming(APR)is an attractive process to produce bio-based hydrogen from waste biomass streams,during which the catalyst stability is often challenged due to the harsh reaction *** this work,three Pt-based catalysts supported on C,AlO(OH),and ZrO_(2)were investigated for the APR of hydroxyacetone solution in afixed bed reactor at 225℃and 35 *** them,the Pt/C catalyst showed the highest turnover frequency for H_(2)production(TOF of 8.9 molH_(2)molPt^(-1)min^(-1))and the longest catalyst *** the AlO(OH)and ZrO_(2)supported Pt catalysts,the side reactions consuming H_(2),formation of coke,and Pt sintering result in a low H_(2)production and the fast catalyst *** proposed reaction pathways suggest that a promising APR catalyst should reform all oxygenates in the aqueous phase,minimize the hydrogenation of the oxygenates,maximize the WGS reaction,and inhibit the condensation and coking reactions for maximizing the hydrogen yield and a stable catalytic performance.

关键词： APR Hydroxyacetone TOF Bio-based H_(2) Support effect

Direct scaling of residual displacements for bilinear and pinching oscillators

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 129-149页

作者： Mohammad Saifullah Vinay k.Gupta Department of Civil Engineering Indian Institute of Technology KanpurKanpur 208016India

The estimation of residual displacements in a structure due to an anticipated earthquake event has increasingly become an important component of performance-based earthquake engineering because controlling these displacements plays an important role in ensuring cost-feasible or cost-effective repairs in a damaged structure after the *** attempt is made in this study to obtain statistical estimates of constant-ductility residual displacement spectra for bilinear and pinching oscillators with 5%initial damping,directly in terms of easily available seismological,site,and model *** of the available models for the bilinear and pinching oscillators are useful when design spectra for a seismic hazard at a site are not *** statistical estimates of a residual displacement spectrum are proposed in terms of earthquake magnitude,epicentral distance,site geology parameter,and three model parameters for a given set of ductility demand and a hysteretic energy capacity coefficient in the case of bilinear and pinching models,as well as for a given set of pinching parameters for displacement and strength at the breakpoint in the case of pinching model *** proposed scaling model is applicable to horizontal ground motions in the western *** earthquake magnitudes less than 7 or epicentral distances greater than 20 km.

关键词： residual displacement spectrum bilinear hysteresis model pinching hysteresis model nonlinear analysis scaling model

Analysis of the Oscillatory Flows of Multiple Shock Waves in a Constant Area Duct

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Journal of Thermal Science 2024年第3期33卷 794-806页

作者： k JAMES Jintu kIM Heuy Dong Department of Mechanical Engineering Andong National UniversityAndong36729Republic of Korea CAD-IT korea Co. Ltd.Seoul08591Republic of Korea

The oscillatory response of multiple shock waves to downstream perturbations in a supersonic flow is studied numerically in a rectangular *** shock waves are formed inside the duct at a shock Mach number of *** duct has an exit height of H,and the effect of duct resonance on multiple shock oscillations is investigated by attaching exit ducts of lengths 0H,50H,and *** downstream disturbance frequency varied from 10 Hz to 200 Hz to explore the oscillation characteristics of the multiple shock *** oscillatory response of shock waves under self-excited and forced oscillation conditions are analyzed in terms of wall static pressure,shock train leading-edge location,shock train length,and the size of the separation *** extent of the initial shock location increases with an increase in exit duct length for the self-excited oscillation *** analysis of the shock train leading edge and the spectral analysis of wall static pressure variations are *** variation in the shock train length is analyzed using the pressure ratio method for self-excited as well as forced *** RMS amplitude of the normalized shock train length(ζ_(ST))increases with an increase in the exit duct length for the self-excited oscillation *** the downstream perturbation frequency is increased,ζ_(ST)is decreased for exit duct *** all exit duct designs and downstream forcing frequencies,the size of the separation bubble grows and shrinks during the shock oscillations,demonstrating the dependence on duct resonance and forced oscillations.

关键词： shock train downstream disturbance supersonic flow shock wave boundary layer interaction duct resonance flow separation

Impact of Fin Arrangement on Heat Transfer and Melting Characteristics of Phase Change Material

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Journal of Thermal Science 2024年第2期33卷 435-456页

作者： Arun UNIYAL Yogesh k.PRAJAPATI Department of Mechanical Engineering National Institute of Technology UttarakhandSrinagar(Garhwal)246174India Department of Mechanical Engineering BIT SindriDhanbadJharkhand828123India

Present work investigates the heat transfer and melting behaviour of phase change material(PCM) in six enclosures(enclosure-1 to 6) filled with paraffin *** enclosures are equipped with distinct arrangements of the fins while keeping the fin's surface area equal in each *** analysis has been presented to recognize the suitable fin arrangements that facilitate improved heat transfer and melting rate of the *** wall of the enclosure is maintained isothermal for the temperature values 335 k,350 k and 365 *** length of the enclosure including fins is ranging between 0 and *** have been illustrated through the estimation of important performance parameters such as energy absorbing capacity,melting rate,enhancement ratio,and Nusselt *** has been found that melting time(to melt 100% of the PCM) is 60.5%less in enclosure-2(with two fins of equal length) as compared to the enclosure-1,having no *** the fin surface area equal,if the longer fin is placed below the shorter fin(enclosure-3),melting time is further decreased by 14.1% as compared to ***,among all the configurations,enclosure-6 with wire-mesh fin structure exhibits minimum melting time which is 68.4% less as compared to the *** on the findings,it may be concluded that fins are the main driving agent in the enclosure to transfer the heat from heated wall to the *** design and positioning of the fins improve the heat transfer rate followed by melting of the PCM in the entire area of the *** of the favourable vortices and natural convection current in the enclosure accelerate the melting phenomenon and help to reduce charging time.

关键词： phase change material enclosure fin melting fraction energy storage heat transfer

Radiative heat transfer analysis of a concave porous fin under the local thermal non-equilibrium condition:application of the clique polynomial method and physics-informed neural networks

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Applied Mathematics and Mechanics(English Edition) 2024年第9期45卷 1613-1632页

作者： k.CHANDAN k.kARTHIk k.V.NAGARAJA B.C.PRASANNAkUMARA R.S.VARUN kUMAR T.MUHAMMAD Amrita School of Artificial Intelligence Amrita Vishwa VidyapeethamBengaluru 560035KarnatakaIndia Department of Studies in Mathematics Davangere UniversityDavangere 577002KarnatakaIndia Computational Science Lab Amrita School of EngineeringAmrita Vishwa VidyapeethamBengaluru 560035KarnatakaIndia Department of Pure and Applied Mathematics School of Mathematical SciencesSunway UniversityPetaling Jaya 47500Malaysia Department of Mathematics College of ScienceKing Khalid UniversityAbha 61413Saudi Arabia

The heat transfer through a concave permeable fin is analyzed by the local thermal non-equilibrium(LTNE)*** governing dimensional temperature equations for the solid and fluid phases of the porous extended surface are modeled,and then are nondimensionalized by suitable dimensionless ***,the obtained nondimensional equations are solved by the clique polynomial method(CPM).The effects of several dimensionless parameters on the fin's thermal profiles are shown by graphical ***,the current study implements deep neural structures to solve physics-governed coupled equations,and the best-suited hyperparameters are attained by comparison with various network *** results of the CPM and physicsinformed neural network(PINN)exhibit good agreement,signifying that both methods effectively solve the thermal modeling problem.

关键词： heat transfer fin porous fin local thermal non-equilibrium(LTNE)model physics-informed neural network(PINN)