检索结果-南通市图书馆

Improvement of solidification model and analysis of 3D channel blockage with MPS method

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2021年第4期15卷 946-958页

作者： Reo KAWAKAMI Xin LI Guangtao DUAN Akifumi YAMAJI Isamu SATO tohru suzuki Cooperative Major in Nuclear Energy Graduate School and Advanced Science and EngineeringFaculty of Science and EngineeringWaseda University3-4-1 OkuboShinjuku-kuTokyo169-8555Japan Department of Nuclear Engineering and Management The University of Tokyo7-3-1 HongoBunkyo-kuTokyo113-8656Japan Department of Nuclear Safety Engineering Faculty of EngineeringTokyo City University1-28-1 TamazutsumiSetagaya-kuTokyo158-0087Japan

In a severe accident of a nuclear power reactor,coolant channel blockage by solidified molten core debris may significantly influence the core degradations that *** moving particle semi-implicit(MPS)method is one of the Lagrangian-based particle methods for analyzing incompressible *** the study described in this paper,a novel solidification model for analyzing melt flowing channel blockage with the MPS method has been developed,which is suitable to attain a sufficient numerical accuracy with a reasonable calculation *** prompt velocity diffusion by viscosity is prioritized over the prompt velocity correction by the pressure term(for assuring incompressibility)within each time step over the“mushy zone”(between the solidus and liquidus temperature)for accurate modeling of solidification before fixing the coordinates of the completely solidified *** sustain the numerical accuracy and stability,the corrective matrix and particle shifting techniques have been applied to correct the discretization errors from irregular particle arrangements and to recover the regular particle arrangements,*** validate the newly developed algorithm,2-D benchmark analyses are conducted for steady-state freezing of the water in a laminar flow between two parallel ***,3-D channel blockage analyses of a boiling water reactor(BWR)fuel support piece have been *** results show that a partial channel blockage develops from the vicinity of the speed limiter,which does not fully develop into a complete channel blockage,but still diverts the incoming melt flow that follows to the orifice region.

关键词： boiling water reactor(BWR) severe accident channel blockage moving particle semi-implicit(MPS)method solidification*

Enhanced hydrogen production from aqueous methanol solution using TiO2/Cu as photocatalysts

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2014年第2期8卷 197-202页

作者： Paramasivan GOMATHISANKAR Tomoko NODA Hideyuki KATSUMATA tohru suzuki Satoshi KANECO Department of Chemistry for Materials Graduate School of Engineering Mie University Mie 514-8507 Japan Environmental Preservation Center Mie University Mie 514-8507 Japan

The photocatalytic hydrogen production from aqueous methanol solution using titanium dioxide （TiO2） was investigated in the addition of metal particles including copper, lead, tin, and zinc. The results show that only the addition of copper particles enhances the hydrogen production. The copper usage and reaction temperature were further optimized for TiO2/Cu photocatalyts. Under the optimal conditions, the hydrogen production using TiO2/Cu as photocatalysts is approxi- mately 68 times higher than that obtained with only TiO2.

关键词： photocatalytic hydrogen generation metha-nol copper particles TiO2 metal-semiconductor interface

Indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with TiO_2 in the presence of hole scavengers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第3期26卷 529-533页

作者： Abdus Samad Shamim Ahsan Ikki Tateishi Mai Furukawa Hideyuki Katsumata tohru suzuki Satoshi Kaneco Department of Chemistry Jagannath University Department of Earth and Atmospheric Sciences Metropolitan State University of Denver Department of Chemistry for Materials Graduate School of Engineering Mie University Mie Global Environment Center for Education & Research Mie University

The indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with titanium dioxide(TiO_2)was investigated with various hole scavengers such as methanol, ethanol, 2-propanol, formaldehyde, acetone,formic acid and acetic acid. Although the direct photocatalytic reduction of arsenate to arsenite with TiO_2 was impossible, an indirect reduction of As(V) was possible in the presence of sacrificial electron donors to form strongly reductive radicals. The addition of ethanol was very effective for indirect photocatalytic reduction of As(V) in aqueous solution with TiO_2 photocatalyst. The indirect photocatalytic reduction rate of As(V) may be related with both the reaction rate constants of reaction of hydroxyl radicals with hole scavenger and the reactivities for the radicals M· which are produced by the reaction of ·OH with hole scavenger.

关键词： Indirect photocatalytic reduction Arsenate Arsenite Titanium dioxide Hole scavenger

Determination of aniline derivatives in water samples after preconcentration with oxidized multiwalled carbon nanotubes as solid-phase extraction disk

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2012年第3期6卷 270-275页

作者： Hideyuki KATSUMATA Yuta ODA Satoshi KANECO tohru suzuki Kiyohisa OHTA Department of Chemistry for Materials Graduate School of Engineering Mie University Tsu 514-8507 Japan Environmental Preservation Center Mie University Tsu 514-8507 Japan

A sensitive and selective preconcentration method using solid-phase extraction （SPE） disk made from oxidized multiwalled carbon nanotubes （OMWCNTs）, has been developed for the determination of aniline derivatives, such as 2-nitroaniline （2-NA）, 4- nitroaniline （4-NA）, and 2,4-dichloroaniline （2,4-DCA） in water samples. Anilines were extracted onto OMWCNT disk and then determined by high performance liquid chromatography （HPLC） with UV detector. Several parameters on the recovery of the analytes were investigated. The experimental results showed that it was possible to obtain quantitative analysis when the solution pH was 8 using 200 mL of validation solution containing 2 ug of anilines and 10 mL of acetonitrile/ethanol （8/2, v/v） as an eluent. Relative standard deviations for five determinations were 7.5% （2-NA）, 6.5% （4-NA） and 3.8% （2,4-DCA） under optimum conditions. The linear range of calibration curves were 0.5 *** 1 to 15 ***-1 for each analyte with good correlation coefficients. The detection limits （3S/N） of 2-NA, 4-NA and 31 *** -1 and 26 ***-1 was successfully applied to 2,4-DCA were *** -1, respectively. Our method the determination of aniline compounds in fiver water sample with high precision and accuracy.

关键词： aniline determination solid-phase extraction,oxidized multiwalled carbon nanotubes water sample,HPLC-UV

Water purification with sintered porous materials fabricated at 400℃ from sea bottom sediments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第2期20卷 172-176页

作者： DABWAN Ahmed H A IMAI Daizo KANECO Satoshi SENMATSU Isamu NAKAHAMA Katsuyuki KATSUMATA Hideyuki suzuki tohru OHTA Kiyohisa Mie Industry and Enterprise Support Center ShimaMie 517-0501Japan Mie Industry and Enterprise Support Center ShimaMie 517-0501Japan Department of Chemistry for MaterialsGraduate School of EngineeringMie UniversityMie 514-8507Japan. Department of Chemistry for Materials Graduate School of EngineeringMie UniversityMie 514-8507Japan. Environmental Preservation Center Mie UniversityMie 514-8507Japan Department of Chemistry for Materials Graduate School of EngineeringMie UniversityMie 514-8507Japan. Environmental Preservation CenterMie UniversityMie 514-8507Japan

A sintering technology for preparing porous materials from sea bottom sediments was developed for use in water purification. The purpose of the present study was to develop methods for converting the sea bottom sediments dredged from Ago Bay into value-added recycled products. The sintered products fabricated at 400℃ were found to be very effective adsorbents for the removal of heavy metals.

关键词： sintering preparation technology porous materials sea bottom sediments water purification heavy metals

Empirical correlations for predicting the self-leveling behavior of debris bed

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2013年第1期24卷 43-52页

作者： CHENG Songbai YAMANO Hidemasa suzuki tohru TOBITA Yoshiharu NAKAMURA Yuya ZHANG Bin MATSUMOTO Tatsuya MORITA Koji Advanced Nuclear System R&D Directorate Japan Atomic Energy Agency (JAEA) Department of Applied Quantum Physics and Nuclear Engineering Kyushu University

Studies on the self-leveling behavior of debris bed are crucial for the assessment of core-disruptive accident (CDA) occurred in sodium-cooled fast reactors (SFR). To clarify this behavior over a comparatively wider range of gas velocities, a series of experiments were performed by injecting nitrogen gas uniformly from a pool bottom. Current experiments were conducted in a cylindrical tank, in which water, nitrogen gas and different kinds of solid particles, simulate the coolant, vapor (generated by coolant boiling) and fuel debris, respectively. Based on the quantitative data obtained (mainly the time variation of bed inclination angle), with the help of dimensional analysis technique, a set of empirical correlations to predict the self-leveling development depending on particle size, particle density and gas injection velocity was proposed and discussed. It was seen that good agreement could be obtained between the calculated and experimental values. Rationality of the correlations was further confirmed through detailed analyses of the effects of experimental parameters such as particle size, particle density, gas flow rate and boiling mode. In order to facilitate future analyses and simulations of CDAs in SFRs, the obtained results in this work will be utilized for the validations of an advanced fast reactor safety analysis code.

关键词：自流平行为模拟冷却水预测气体速度注入氮气粒子密度实验值

Simultaneous removal of trihalomethanes by bimetallic Ag/Zn:kinetics study

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2010年第3期4卷 322-327页

作者： Ahmed H A DABWAN Satoshi KANECO Hideyuki KATSUMATA tohru suzuki Kiyoyuki EGUSA Kiyohisa OHTA Faculty of Chemical Engineering Technology Tati University CollegeJalan PanchorTeluk Kalong24000 KemamanTerengganuMalaysia Department of Chemistry for Materials Graduate School of EngineeringMie UniversityMie 514-8507Japan Environmental Preservation Center Mie UniversityMie 514-8507Japan

In the present work,bimetallic silver/zinc was applied into the degradation of trihalomethanes,THMs:CHCl_(3),CHBrCl_(2),CHBr_(2)Cl,and CHBr_(3).The kinetics reaction rates and removal efficiencies of the THM compound mixtures,in the aqueous solutions,were *** experiments were conducted under mild conditions,ambient temperature,and *** primary degradation reaction followed a pseudo-first-order kinetic *** first-order rate constants and the degradation efficiencies followed the decreasing order of CHBr_(3)>CHBr_(2)Cl>CHBrCl_(2)>CHCl_(3).The bond dissociation energy and hydrophilic/hydrophobic characteristics of the THM compounds may become the most important parameters affecting the degradation kinetics and efficiency by bimetallic Ag/Zn.

关键词： degradation trihalomethanes bimetallic silver/zinc halogenated pollutants kinetics

Effect of texture microstructure on tribological properties of tailored Ti3AlC2 ceramic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2017年第2期6卷 120-128页

作者： Ludi XU Degui ZHU Salvatore GRASSO tohru S.suzuki Akira KASAHARA Masahiro TOSA Byung-nam KIM Yoshio SAKKA Minhao ZHU Chunfeng HU Key Laboratory of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China School of Engineering and Material Science Queen Mary University of London London El 4NS UK National Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan

Tribological property of c-axis textured shell-like Ti3AlC2 ceramic was investigated using reciprocating sliding balls (SUS304) under loads of 1,5,and 9 *** was found that the textured top surface (TTS),corresponding to the (000l) plane,shows the lowest mean coefficient of friction in comparison with those measured on the textured side surface (TSS),where the sliding directions are parallel (TSS-1) and perpendicular (TSS-2) to c axis,under the same *** all the tested orientations,the TSS-2 exhibited the lowest wear rate of 1.51 × 10-3 mm3/(N·m) under the load of 9 *** worn mechanisms on the TTS and TSS-1 were delamination,grain fracture,and grain *** the TSS-2,plowing effect against balls was the dominating *** work suggests the criteria to maximize the wear resistance in the load range of 1-9 N.

关键词： tailored Ti3AlC2 mean coefficient of friction wear rate worn mechanisms

Development of an Evaluation Methodology for Fuel Discharge in Core Disruptive Accidents of Sodium-Cooled Fast Reactors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2014年第5期8卷 785-793页

作者： Kenji Kamiyama Yoshiharu Tobita tohru suzuki Ken-ichi Matsuba Japan Atomic Energy Agency Ibaraki 311-1393 Japan

The purpose of the present study is to develop a methodology to evaluate fuel discharge through the CRGT （control-rod guide tube） during CDAs （core-disruptive accidents） of SFRs （sodium-cooled fast reactors）, since fuel discharge will decrease the core reactivity and CRGTs have a potential to provide an effective discharge path. Fuel discharge contains multi-component fluid dynamics with phase changes, and, in the present study, the SFR safety analysis code SIMMER （Sn, implicit, multifield, multicomponent, Eulerian recriticality） was utilized as a technical basis. First, dominant phenomena affecting fuel discharge through the CRGT are identified based on parametric calculations by the SIMMER code. Next, validations on the code models closely relating to these phenomena were carried out based on experimental data. It was shown that the SIMMER code with some model modifications could reproduce the experimental results appropriately. Through the present study, the evaluation methodology for the molten-fuel discharge through the CRGT was successfully developed.

关键词： Sodium-cooled fast reactor, core disruptive accident molten-fuel discharge, FBR (fast breeder reactor) safety analysis code SIMMER.