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Soil Remediation with Natural Organic Substances

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Soil Remediation with Natural Organic Substances

Investigation for Environmental Radioactivity in Relic Obtained from Salt-Production Site,Japan

作者： t.Kubota t.ohta Y.Mahara Research Reactor Institute Kyoto University

INtRODUCtION:Soils contaminated with heavy metals can be remediated by chelating reagents[1]in the way that metals are complexed with such reagents to remove those metals from soil *** remediation would be affected by radiation irradiation where the following reactions would be expected:the activation of contaminated soil surface by radiolytic radicals,the redox reaction of heavy metals,and the radiolysis of chelating *** this study the elusion of Gd from sand samples and the irradiation field of Co gamma-ray have

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Investigation for Environmental Radioactivity in Relic Obtai...

Development of Polarized HD target for Future LEPS Experiments at SPring-8

作者： t.ohta t.Kubota t.ohta t.Kubota t.Fujii S.Fukutani t.Nakano Y.Kurihara Y.Mahara Research Reactor Institute Kyoto University Research Institute for Human and Nature the Intellectual Property Headquarters Meiji University

INtRODUCtION:Radiocarbon,half-life 5,730 years, is naturally produced in the atmosphere by the cosmic -ray reaction N(n,p) C(Libby,1946).As a consequence of nuclear weapons testing,the activity of C in the atmosphere increased during the 1950s to 1960s;since the adoption of the Comprehensive Nuclear test Ban treaty,the level has decreased ***, C is artificially produced in nuclear power and reprocessing plants and then released into the environ-

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原子核物理评论 2009年第S1期26卷 79-82页

作者： H.Kohri M.Fujiwara K.Fukuda t.Kunimatsu C.Morisaki t.ohta K.S.Ueda M.Uraki M.Utsuro M.Yosoi Research Center for Nuclear Physics(RCNP) Osaka University College of Medical technology Kyoto University

We are carrying out hadron photoproduction experiments by using polarized photon beams at SPring-8 in Japan. In 2005,we started developing a polarized HD target for future experiments using both the polarized photon beams and the polarized target. the polarized HD target is an idealistic target for experiments observing reactions with small cross sections because the HD does not include heavy nuclei which produce many background events. the measurement of double polarization asymmetries is expected to give much important information to investigate the nucleon hidden structure,hadron photoproduction dynamics,and exotic hadron property. We report on the present status of the development of the polarized HD target at RCNP.

关键词： strangeness photon target

由高精度强震观测台网得到的岩石场地上的地震运动特征

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世界地震工程 1984年第6期 9-13页

作者： t.ohta 黄迈

一、序言对核电站的抗震设计来说,估计未来地震的强地面运动是必不可少的。因此,根据强震观测资料制定了若干设计谱。这些谱的一个典型例子是由Hisada等人提出的,是在岩石场地上得到的与震级、震中距有关的强震设计谱。在日本这些谱已... 详细信息

一、序言对核电站的抗震设计来说,估计未来地震的强地面运动是必不可少的。因此,根据强震观测资料制定了若干设计谱。这些谱的一个典型例子是由Hisada等人提出的,是在岩石场地上得到的与震级、震中距有关的强震设计谱。在日本这些谱已实际应用于核电站

关键词：反应谱震级岩石震源距地震

用计算机自动整定PID控制参数的一种新优化方法

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系统工程与电子技术 1983年第2期 27-33页

作者： t.ohta H.tanaka 林维松

所提出的PID控制参数优化方法有助于现场工程师的整定操作。控制系统限定为单输入单输出过程,但可具有延迟和无自平衡调整的性质。为了过程参数的估算,定义了特征面积。为了优化控制参数,以加权平方误差积分形式定义了一种新的性能指标... 详细信息

所提出的PID控制参数优化方法有助于现场工程师的整定操作。控制系统限定为单输入单输出过程,但可具有延迟和无自平衡调整的性质。为了过程参数的估算,定义了特征面积。为了优化控制参数,以加权平方误差积分形式定义了一种新的性能指标。由最优整定值获得的闭路响应特性具有期望的衰减因子和稳定裕度。所提出的算法可在直接数字控制(DDC)系统上付诸实现。用此系统进行了现场实验,其结果使我们确信此法适用于实际过程。

关键词： PID 控制参数特征面积自动整定整定值自整定计算机优化方法

Impact of Pollutant Concentration and Particle Deposition on the Radiative Flow of Casson-Micropolar Fluid between Parallel Plates

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 665-690页

作者： Ghaliah Alhamzi Badr Saad t.Alkahtani Ravi Shanker Dubey Vinutha Kalleshachar Neelima Nizampatnam Department of Mathematics and Statistics College of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11564Saudi Arabia Department of Mathematics College of ScienceKing Saud UniversityRiyadh11989Saudi Arabia Department of Mathematics Amity School of Applied SciencesAmity University RajasthanJaipur302002RajasthanIndia Department of Studies in Mathematics Davangere UniversityDavangere577002India Department of Electronics and Communication Engineering Amrita School of EngineeringAmrita Vishwa VidyapeethamBengaluru560035India

Assessing the behaviour and concentration of waste pollutants deposited between two parallel plates is essential for effective environmental *** the effectiveness of treatment methods in reducing pollution scales is made easier by analysing waste discharge *** waste discharge concentration analysis is useful for assessing how effectively wastewater treatment techniques reduce pollution *** study aims to explore the Casson micropolar fluid flow through two parallel plates with the influence of pollutant concentration and thermophoretic particle *** explore the mass and heat transport features,thermophoretic particle deposition and thermal radiation are *** governing equations are transformed into ordinary differential equations with the help of suitable similarity *** Runge-Kutta-Fehlberg’s fourthfifth order technique and shooting procedure are used to solve the reduced set of equations and boundary *** integration of a neural network model based on the Levenberg-Marquardt algorithm serves to improve the accuracy of predictions and optimize the analysis of *** outcomes are displayed to analyze the characteristics of the relevant dimensionless parameters in the current *** reveal that concentration upsurges as the micropolar parameter *** concentration reduces with an upsurge in the thermophoretic *** upsurge in the external pollutant source variation and the local pollutant external source parameters enhances mass *** surface drag force declines for improved values of porosity and micropolar parameters.

关键词： Micropolar fluid thermal radiation porous medium thermophoretic particle deposition waste discharge concentration

Unsteady Behavior and Control of Vortices in Centrifugal Compressor

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Journal of thermal Science 2014年第5期23卷 401-411页

作者： Yutaka ohta Nobumichi Fujisawa Department of Applied Mechanics and Aerospace Engineering Waseda University3-4-1OkuboShinjukuTokyo169-8555Japan Graduate School of Fundamental Science and Engineering Waseda University3-4-1OkuboShinjukuTokyo169-8555Japan

two examples of the use of vortex control to reduce noise and enhance the stable operating range of a centrifugal compressor are presented in this *** the case of high-flow operation of a centrifugal compressor with a vaned diffuser,a discrete frequency noise induced by interaction between the impeller-discharge flow and the diffuser vane,which appears most notably in the power spectra of the radiated noise,can be reduced using a tapered diffuser vane(tDV) without affecting the performance of the *** longitudinal vortices produced by leakage flow passing through the tapered portion of the diffuser vane induce secondary flow in the direction of the blade surface and prevent flow separation from the leading edge of the *** use of a tDV can effectively reduce both the discrete frequency noise generated by the interaction between the impeller-discharge flow and the diffuser surface and the broadband turbulent noise *** the case of low-flow operation,a leading-edge vortex(LEV) that forms on the shroud side of the suction surface near the leading edge of the diffuser increases significantly in size and blocks flow in the diffuser *** formation of an LEV may adversely affect the performance of the compressor and may cause the diffuser to *** a one-side tapered diffuser vane to suppress the evolution of an LEV,the stable operating range of the compressor can be increased by more than 12 percent,and the pressure-rise characteristics of the compressor can be *** results of a supplementary examination of the structure and unsteady behavior of LEVs,conducted by means of detailed numerical simulations,are also presented.

关键词： centrifugal compressor vortex control interaction tone noise noise reduction CFD DES analysis stability enhancement leading-edge vortex.

Coexisting State of Surge and Rotating Stall in a two-Stage Axial Flow Com-pressor using a Double-Phase-Locked Averaging technique

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Journal of thermal Science 2017年第1期26卷 38-46页

作者： Yuu SAKAtA Yutaka ohta Graduate school of Fundamental Science and Engineering Waseda University 3-4-10kuboShinjuku Tokyo 169-8555 Japan. Department of Applied Mechanics and Aerospace Engineering Waseda University 3-4-10kubo Shinjuku Tokyo169-8555 Japan.

the interaction between surge and rotating stall in an axial flow compressor was investigated from the viewpoint of an unsteady inner flow structure. the aim of this study was to identify the key factor that determines the switching phenomenon of a surge cycle. the main feature of the tested compressor is a shock tube connected in series to the compressor outlet through a diaphragm, slits, and a concentric duplex pipe: this system allows surge and rotating stall to be generated by connecting the shock tube with the compressor, or enables the compression plane wave injection. the unsteady characteristics and the internal flow velocity fluctuations were measured in detail, and the stall cell structure was averaged and visualized along the movement of the operation point under a coexisting state of surge. A coefficient of the cell scale fluctuation was calculated using the result of the averaging, and it confirmed that the processes of inner flow structure change differed from each other according to the next cycle of the surge. the result suggests that the key factor that determines the next cycle is the transformation of the internal flow structure, particularly between the stall cell and the entire circumferential stall, in both the recovering and stalling processes.

关键词： Axial flow compressor, Rotating stall, Surge, Double-phase-locked measurement, Compression wave.

the thermal conductivity of the Earth's core and implications for its thermal and compositional evolution

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National Science Review 2021年第4期8卷 18-20页

作者： Kenji ohta Kei Hirose Department of Earth and Planetary Sciences Tokyo Institute of Technology Earth-Life Science Institute Tokyo Institute of Technology Department of Earth and Planetary Science The University of Tokyo

the thermal conductivity of iron alloys is a key to understanding the mechanism of convection in the Earth’s liquid core and its thermal history. the Earth’s magnetic field is formed by a dynamo action that requires...

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