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Study on Neutron Energy Spectrum Measurements for Pulsed Neutron Source

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Study on Neutron Energy Spectrum Measurements for Pulsed Neu...

作者： k.nakajima J.Hori Research Reactor Institute Kyoto University

INTRODUCTION:The pulsed neutron source using the electron linear accelerator at Research Reactor Institute of kyoto University is widely used for nuclear science researches including nuclear data(neutron reaction cross sections) measurements[1].It is important to understand the characteristics of the pulsed source,such as neutron spectra,for the proper use of the source. There are three conventional techniques to measure the neutron spectra,(1) Multi-foil activation method,(2) Time-of-Flight(TOF) method,and(3) Neutron counter *** these techniques,only the TOF

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Limiting Performance of YBa2Cu3O7-δ High-frequency Josephson Devices

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Limiting Performance of YBa2Cu3O7-δ High-frequency Josephso...

1996年中日联合微波技术会议

作者： H.Myoren k.nakajima T.Yamashita Research Institute of Electrical Communication Tohoku University 2-1-1 KatahiraAoba-kuSendai 980-77Japan

During the past few years,there has been considerable progress in the development of thin film YBaCu0(7-σ)(YBCO) Josephson devices,such as superconducting quantum interference devices(SQUIDs) and high-frequency *** the origin and limiting of noise for the devices is a key point for their ***,as the interesting of YBCO Josephson devices for THz applications,it is necessary to know the upper frequency limit’of the devices.

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A Novel High Efficient Photovoltaic System Using Concave and Small Conventional Si Solar Cells

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A Novel High Efficient Photovoltaic System Using Concave and...

第十五届国际光伏科学与工程大会

作者： k.Ohdaira k.Fujiwara W.Pan N.Usami k.nakajima Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai 980-8577 Japan Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai 980-8577 Japan Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai 980-8577 Japan Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai 980-8577 Japan Institute for Materials Research Tohoku University Katahira 2-1-1 Aoba-ku Sendai 980-8577 Japan

＜正＞ A concave Si crystal mirror formed by mechanical polishing was processed to a solar cell with conversion efficiency of as high as 14.7%. Furthermore, the reflection from the concave solar cell was also utilized as an energy source in the small conventional cell located at the focal point and consequently the conversion efficiency of 16.3% was obtained in this integration system. The improvement of the total conversion efficiency indicates that this integration system can be a candidate for another method to avoid the reflection loss.

关键词： Focused Mirror Polishing Reflection

Self-Injection and Acceleration of Monoenergetic Electron Beams from Laser Wakefield Accelerators in a Highly Relativistic Regime

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Chinese Physics Letters 2008年第8期25卷 2938-2941页

作者： H.Yoshitama T.kameshima 3谷渝秋郭仪焦春晔刘红杰彭翰生唐传铭王小东温贤伦温天舒吴玉迟张保汉朱启华黄晓军安维民黄文会唐传祥林郁正王小东陈黎明 H.kotaki M.kando k.nakajima Department of Accelerator Science The Graduate University for Advanced Studies 1-10ho Tsukuba Ibaraki 305-0801 Japan High Energy Accelerator Research Organization 1-10ho Tsukuba Ibaraki 305-0801 Japan Laser Fusion Research Center China Academy of Engineering Physics Sichuan 621900 Department of Engineering Physics Tsinghua University Beijing 100084 University of Southern California Los Angels CA90089-0484 USA kansai Photon Science Institute Japan Atomic Energy Agency Kyoto 619-0215 Japan

Self-injection and acceleration of monoenergetic electron beams from laser wakefield accelerators are first investigated in the highly relativistic regime, using 100 TW class, 27 fs laser pulses. Quasi-monoenergetic multi- bunched beams with energies as high as multi-hundredMeV are observed with simultaneous measurements of side-scattering emissions that indicate the formation of self-channelfing and self-injection of electrons into a plasma wake, referred to as a ＇bubble＇. The three-dimensional particle-in-cell simulations confirmed multiple self-injection of electron bunches into the bubble and their beam acceleration with gradient of 1.5 GeV/cm.

关键词： PULSE INTERACTION PLASMAS

Study on Nondestructive Analysis and Neutron Behavior Using Photonuclear Reaction

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Study on Nondestructive Analysis and Neutron Behavior Using ...

作者： k.Ishibashi N.Shigyo A.k.M.L.Rahman k.kato T.kajimoto J.Hori k.nakajima Department Applied Quantum Physics and Nuclear Engineering Kyushu University

INTRODUCTION:The activity density evaluation is important to dispose radiological waste containing transuranium nuclei and fission *** methods as the scaling factor method have been studied for quantitative evaluation of "difficult to measure" nucleus which emits onlyβ*** methods need the destructive analysis of many *** measurements of gamma rays generated by photonuclear reactions for the "difficult to measure" nuclei has been proposed to examine activity densities by the "nondestructive analysis".The photon -induced cross section data for some nuclei were

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Migratory mode transition of astrocyte progenitors in the cerebral cortex: an intrinsic or extrinsic cell process?

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Neural Regeneration Research 2024年第3期19卷 471-472页

作者： Michio Miyajima Hidenori Tabata kazunori nakajima Department of Anatomy Keio University School of MedicineShinjuku-kuTokyoJapan Department of Molecular Neurobiology Institute for Developmental ResearchAichi Developmental Disability CenterKasugaiAichiJapan

The cerebral cortex is comprised of properly localized cell types that exert their specific *** the developing brain,cells migrate from the germinal region to their functional locations(Silva et al.,2019;Cossart and Garel,2022).For example,neocortical excitatory neurons are generated in the cerebral ventricular and subventricular zones,move to the developing cortical plate via radial migration,and reside in a radial array of six neuronal layers(Oishi and nakajima,2018).On the other hand,cortical interneurons are mainly generated in ganglionic eminences,migrate tangentially across the cerebral cortex,and reach their final destinations in the cortex(Lim et al.,2018).The failure of neuronal migration leads to defects in cortical layer *** the mechanisms of neuronal distribution have been well examined,how astrocytes are diffusely distributed in the cortex is still *** are glial cells in the cerebral cortex with several functions,including metabolic support and synapse formation(Abbott et al.,2006;Bosworth and Allen,2017;Allen and Lyons,2018).For example,astrocytes establish synaptic connectivity in the developing brain while they contact numerous synapses and maintain optimal neuronal activity in the adult *** the developing brain,astrocytes are primarily generated from radial glia after the neurogenic *** a certain type of astrocyte called fibrous astrocytes populates the white matter,protoplasmic astrocytes migrate to the cortical plate during neural network formation.

关键词： cerebral migrate Abbott

Development on In-Reactor Observation System Using Cherenkov Light

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Development on In-Reactor Observation System Using Cherenkov...

作者： k.Tsuchiya S.kitagishi Y.Nagao N.Takemoto M.Naka A.kimura T.Sano H.Unezaki T.Yoshimoto k.nakajima Y.Fujiwara Y.Okumura S.Yamamoto Neutron Irradiation and Testing Reactor Center JAEA

INTRODUCTION:The Cherenkov light is a faint emission accompanying the passage of charged particles through a transparent medium at speeds faster than the speed of light in that *** high-energy gamma rays can generate high-velocity electrons by Compton scattering,Cherenkov light can be emitted as a result of gamma radiation fields as ***,the Cherenkov Viewing Device(CVD) was developed as an instrument specifically designed to form an image of the UV portion of this glow and it is used routinely by the

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How are multiple satellites seen from the ground? Relative apparent motion and formation stabilization

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Astrodynamics 2024年第1期8卷 121-134页

作者： kenta nakajima Yasuhiro Yoshimura Hongru Chen Toshiya Hanada Department of Aeronautics and Astronautics Kyushu University744 Motooka Nishi-kuFukuoka819-0395Japan

This paper answers how multiple satellites are seen from the ground. This question is inspired by space-advertising, a public exhibition in the night sky using a dot matrix of satellites that are bright enough to be seen by the naked eye. Thus, it is important for space advertisement that the specific dot matrix is seen. Moreover, the stability of the dot matrix during a visible span is very valuable. To stabilize the dot matrix, this study formulates an apparent position of a dot from a representative dot seen from the ground. The formulation, linear functions of a set of relative orbital elements, reveals the appearance of the dot matrix. The proposed relative variable in the formulation drives the instability of the dot matrix, thereby revealing an initial stable configuration of deputies from a chief. The arbitrary dot matrix designed using the configuration is stable even at low elevations without orbital control during the visible span.

关键词： formation flying relative motion stabilization astrodynamics multi-apparent motions space advertisement

SILEX-1装置上等离子体尾场加速电子初步实验

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高能物理与核物理 2006年第Z1期30卷 108-110页

作者：华剑飞安维明黄文会唐传祥林郁正谷渝秋刘红杰王向贤周维民焦春晔温天舒何颖玲温贤伦洪伟彭翰生黄小军王晓东周凯南郭仪朱启华 k.nakajima 陈黎明清华大学工程物理系北京100084 中国工程物理研究院激光聚变研究中心绵阳621900 Japan Atomic Energy Research Institute

激光等离子体加速电子机制可以产生准单能的高能电子束,近年来成为国际上的研究热点．中国工程物理研究院激光装置已经能够达到286TW的输出功率,为国内在该领域的研究提供了实验条件．文章介绍了在SILEX-1装置上开展的激光等离子体加速... 详细信息

激光等离子体加速电子机制可以产生准单能的高能电子束,近年来成为国际上的研究热点．中国工程物理研究院激光装置已经能够达到286TW的输出功率,为国内在该领域的研究提供了实验条件．文章介绍了在SILEX-1装置上开展的激光等离子体加速电子的初步实验,并对测得结果进行讨论, 为下一步实验的进行提供了准备条件．

关键词：等离子体密度气体喷嘴电子能量