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Open Journal of Metal 2014年第4期4卷 112-119页

作者： Rie Y. Umetsu mikiko saito Toshio Sasaki Tetsushi Sekiguchi Jun Mizuno Hiroshi Kawarada Institute for Materials Research Tohoku University Sendai Japan Institute for Nanoscience & Nanotechnology Waseda University Tokyo Japan

Depth profiles of absorbed hydrogen introduced by electrochemical charging and light elements were analyzed in Ni-Nb-Zr-H amorphous alloy ribbons using a glow discharge optical emission spectrometer. It was clarified that the absorbed hydrogen was comparatively well-distributed on the sample surface and that the content of the hydrogen decreased with increasing depth from the surface. That is, the amount of absorbed hydrogen on the surface was about 17 at %, while that inside the specimens decreased to several atomic percent. The depth profiles of the hydrogen which were close to the surface were slightly different between those on the roller side and those on the free side in the melt-spun ribbon. The difference is thought to originate from the existence of oxygen impurity on the surface and from the difference of the Zr content.

关键词： Amorphous Ribbon Hydrogen Absorption Glow Discharge Optical Emission Spectroscopy Depth Profile

Transport Properties of Ni-Nb-Zr Glassy Alloys and Hydrogen Absorbed Alloys

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Open Journal of Metal 2013年第3期3卷 45-49页

作者： Rie Y. Umetsu Hajime Yoshida Mikio Fukuhara Shin-ichi Yamaura Toshio Sasaki Tetsushi Sekiguchi mikiko saito Jun Mizuno Hiroshi Kawarada Institute for Materials Research Tohoku University Sendai Japan Institute for Nanoscience & Nanotechnology Waseda University Tokyo Japan Research Institute for Electromagnetic Materials Sendai Japan

The electrical transport properties of (Ni0.8Nb0.2)100-xZrx (x = 30, 40 and 50) amorphous ribbons and hydrogen charged specimens were investigated. The amorphous ribbons indicated a negative coefficient in the temperature dependence of their electrical resistivity as well as the typical transport properties of the amorphous alloys with comparatively high values of electrical resistivity, ρ. The normalized temperature coefficient of the resistivity (TCR ≡ 1/ρ300K·dρ/dT) tended to increase with increasing x in the temperature range of 100-300 K. These behaviors would suggest that the transport properties of the present amorphous ribbons were governed by temperature variation of the Debye-Waller factor, not by electron-phonon scattering. The hydrogen charged ribbons obtained by an electrochemical method also showed similar electrical resistivity behaviors as a function of the temperature. However, TCR of x = 40 with hydrogen charged ribbon, in which the amount of absorbed hydrogen was about 14 at%, increased about three times more than that of the pre-charged amorphous ribbon.

关键词： Electrical Resistivity Amorphous Alloy Ribbon Hydrogen Absorption

East Asia Winter Monsoon changes inferred from environmentally sensitive grain-size component records during the last 2300 years in mud area southwest off Cheju Island,ECS

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Science China Earth Sciences 2006年第6期49卷 604-614页

作者： Yoshiki saito Geological Survey of Japan Tsukuba Ibaraki 305-8567 Japan

Environmentally sensitive grain-size component (ESGSC) extracted from grain-size data of a sediment core B2, which were retrieved from mud area southwest off Cheju Island (MACI), East China Sea (ECS), can be used to indicate the variations of East Asia Winter Monsoon (EAWM), with high (low) content/mean-size of ESGCS denote to strong (weak) EAWM. Combined with AMS14C datings core B2 provides a continuous high-resolution record of EAWM changes over the past 2300 years, with an average resolution of 13 years. The results show that the variations of EAWM are con-sistent with temperature changes inferred from historical documents in eastern China over the past 2300 years, from which four climate stages may be identified. In stages before 1900 aBP (50 AD) and 1450―780 aBP (50―1170 AD) the EAWM were comparatively weak, corresponding to warm climate periods in eastern China, respectively. And in stages of 1900―1450 aBP (50―500 AD) and 780―219 aBP (1170―1731 AD) the EAWM were strongly developed, which correspond well to climate changes of two cold periods in eastern China. It is also shown from this study that the stage at 780―219 aBP (1170―1731 AD) was the coldest climate period during the last 2300 years and could be, therefore, related to the Little Ice Age (LIA). Climatic fluctuations appeared obviously in all the four stages, and two climate events of abrupt changes from warm to cold occurred at around 1900 aBP (50 AD) and 780 aBP (1170 AD), of which the latter is probably related to globe-scale changes of atmospheric circulation at that time.

关键词： East China Sea, mud area, environmentally sensitive grain-size component, East Asia Winter Monsoon, Little Ice Age, Late Holocene.

A Bubble Column Dehumidifier using Ionic Liquid Desiccant for Low-Humidity Industries: Insights into Transfer Processes Integrating Experiment and CFD Modelling

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Journal of Thermal Science 2024年第6期33卷 2348-2371页

作者： CAO Bowen YIN Yonggao saito Kiyoshi School of Energy and Environment Southeast UniversityNanjing 210096China School of Fundamental Science and Engineering Waseda UniversityTokyo 169-8555Japan Department of Applied Mechanics and Aerospace Engineering Waseda UniversityTokyo 169-8555Japan

Liquid desiccant deep dehumidification(LDDD)is an excellent energy-saving technology for low-humidity *** liquids(ILs)are favored as optimal working fluids for LDDD,owing to their low vapor pressure,non-crystallization,and *** combined application of IL desiccant with the bubble column has been proven to effectively improve deep *** present work focuses specifically on the insights into air-liquid transfer processes in bubble column dehumidifier using ionic liquid *** effect of operating parameters on volumetric transfer coefficient is examined based on the experimental ***,the bubble swarms meso-scale flow structure is predicted using computational fluid dynamics coupled with a population balance model(CFD-PBM).Besides,the structure-activity relationship between meso-scale flow structure and transfer performance is *** results indicated a notable phenomenon of bubble aggregation/breakage in the moist air-IL desiccant bubbly deep dehumidification(MA-ILD BDD)system,with a specific interfacial area is basically less than 40 m^(-1).Meanwhile,a decrease in solution temperature,correlated with a significant increase in viscosity,leads to larger turbulent eddies and a slower breakage ***,a high transfer potential difference enhances heat and mass transfer coefficients at lower solution temperatures,with the mass transfer coefficient at 4℃ being approximately three times that at 10℃.As the superficial velocity changes,the specific interfacial area and heat and mass transfer coefficients have a positive synergistic effect on volumetric transfer ***,this synergistic effect is reversed with variations in solution *** study aims to clarify the air-liquid transfer mechanism in bubble column dehumidifierusingILdesiccant.

关键词： liquid desiccant ionic liquid bubble column deep dehumidification heat and mass trans low-humidityindustries

Robust camera pose estimation by viewpoint classification using deep learning

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Computational Visual Media 2017年第2期3卷 189-198页

作者： Yoshikatsu Nakajima Hideo saito Department of Science and Technology Keio UniversityJapan

Camera pose estimation with respect to target scenes is an important technology for superimposing virtual information in augmented reality(AR). However, it is difficult to estimate the camera pose for all possible view angles because feature descriptors such as SIFT are not completely invariant from every perspective. We propose a novel method of robust camera pose estimation using multiple feature descriptor databases generated for each partitioned viewpoint, in which the feature descriptor of each keypoint is almost invariant. Our method estimates the viewpoint class for each input image using deep learning based on a set of training images prepared for each viewpoint class. We give two ways to prepare these images for deep learning and generating databases. In the first method, images are generated using a projection matrix to ensure robust learning in a range of environments with changing *** second method uses real images to learn a given environment around a planar pattern. Our evaluation results confirm that our approach increases the number of correct matches and the accuracy of camera pose estimation compared to the conventional method.

关键词： pose estimation augmented reality(AR) deep learning convolutional neural network

Resourceability on nuclear fuel cycle by transmutation approach

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Science China Chemistry 2012年第9期55卷 1746-1751页

作者： OZAWA Masaki saito Masaki Research Laboratory for Nuclear Reactors Tokyo Institute of Technology2-12-1-N1-1 OokayamaMeguro-kuTokyo 152-8550Japan

A resourceability on nuclear fuel cycle by transmutation of fission products in the spent fuel of nuclear reactors is discussed in this paper to investigate the feasibility of ＂creation and utilization＂ of Apr6s ORIENT from Adv.-ORIENT cycle, in which chemical ＂separation and utilization＂ of nuclear rare metals （platinum group metals, Mo, Tc, rare earth, etc.） has been proposed since FY2006. Apr6s ORIENT research program was newly initiated in FY2011 for nuclear transmutation of fission products into stable or short-lived highly-valuable elements. In the resourceability of rare earth metals from fission products, non-radioactive Nd and Dy can be created from Pr and Tb, respectively, by transmutation. Especially, the Dy creation has relatively high feasibility of about 10-20 %/y in creation rate. A proper moderation of neutrons in blanket of fast reactors may be required to provide a high creation rate of La from Ba. In light platinum group metals, non-radioactive Ru can be created from Tc by transmutation, of which creation rate is about 4-5 %/y in blanket of fast reactors. Pd created from Rh is almost non-radioactively depending on the isotope fraction of 107pd. Rh creation from Ru is not feasible under the neutron irradiation of typical nuclear reactors.

关键词： Apres ORIENT Advanced ORIENT cycle nuclear rare metal transmutation nuclear fuel cycle

Mapping urban building stocks for vulnerability assessment preliminary results

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International Journal of Digital Earth 2011年第S01期4卷 117-130页

作者： Keiko saito Robin Spence Department of Architecture University of CambridgeCambridgeUK Cambridge Architectural Research Ltd CambridgeUK Willis Research Fellow Willis Research Network

This paper discusses a methodology to collect building inventory data by combining image processing techniques,field work or tools such as Google Street View and applying statistical *** the methodology outlined in Marinescu(2002),a family of Gabor filters are first constructed,which are then applied to an optical high-resolution *** output from the processed image is segmented using Self-Organising *** paper examines the relationship between the segmented areas in the image and the building type distribution within each segmented area,by deriving the distribution from field *** relationship between the average number of buildings in these cells against the number of grid cells allocated to each segmentation cluster is also ***,using these results,the overall building inventory distribution for the whole of the case study site of Pylos is presented.

关键词： building inventory data collection remote sensing high-resolution optical satellite images Gabor filters Self-Organising Maps field data

Removing fences from sweep motion videos using global 3D reconstruction and fence-aware light field rendering

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Computational Visual Media 2019年第1期5卷 21-32页

作者： Chanya Lueangwattana Shohei Mori Hideo saito Department of Science and Technology Keio University Institute of Computer Graphics and Vision Graz University of Technology

Diminishing the appearance of a fence in an image is a challenging research area due to the characteristics of fences(thinness, lack of texture, etc.) and the need for occluded background restoration. In this paper, we describe a fence removal method for an image sequence captured by a user making a sweep motion, in which occluded background is potentially observed. To make use of geometric and appearance information such as consecutive images, we use two well-known approaches: structure from motion and light field rendering. Results using real image sequences show that our method can stably segment fences and preserve background details for various fence and background combinations. A new video without the fence, with frame coherence, can be successfully provided.

关键词： video fence video repair diminished reality(DR) structure from motion(SfM) light field rendering(LFR)

Computational Cavitation Flows at Inception and Light Stages on an Axial-Flow Pump Blade and in a Cage-Guided Control Valve

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Journal of Thermal Science 2007年第4期16卷 337-345页

作者： Sumio saito MasahiroSHIBATA HideoFUKAE Eisuke OUTA Tokyo National College of Technology 1220-2 Kunugida-machiHachioji-shiTokyo 193-0997 Graduate student Graduate School of Science and EngineeringWaseda University Department of Mechanical Engineering Waseda UniversityOkubo 3-4-1Shinjyuku-ku Tokyo 1600072Japan

Cavitation flows induced around an axial-flow pump blade and inside a high pressure cage-type valve are simulated by a two-dimensional unsteady Navier-Stokes analysis with the simplest treatment of bubble dynamics. The fluid is assumed as a continuum of homogeneous dispersed mixture of water and vapor nuclei. The analysis is aimed to capture transient stages with high amplitude pressure change during the birth and collapse of the bubble especially at the stage of cavitation inception. By the pump blade analysis, in which the field pressure is moderate, cavitation number of the inception and locations of developed cavitation are found to agree with experimental results in a wide flow range between high incidence and negative incidence. In the valve flow analysis, in which the water pressure of 5MPa is reduced to 2MPa, pressure change responding to the bubble collapse between the vapor pressure lower than 1 KPa and the extreme pressure of higher than 104 KPa is captured through a stable computation. Location of the inception bubble and pressure force to the valve plug is found agree well with the respective experimental features.

关键词： Cavitation unsteady CFD hydrofoil control valve homogeneous mixture inception and collapse transient pressure

Electromechanically reconfigurable plasmonic photodetector with a distinct shift in resonant wavelength

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Microsystems & Nanoengineering 2023年第2期9卷 219-226页

作者： Masaaki Oshita Shiro saito Tetsuo Kan Graduate School of Informatics and Engineering The University of Electro-Communications1-5-1ChofugaokaChofu-cityTokyo 182-8585Japan IMRA JAPAN CO. LTD2-36Hachiken-choKariyaAichi 448-8650Japan

Plasmonic photodetectors have received increasing attention because their detection properties can be designed by tailoring their metal structures on surfaces without using any additional *** of the plasmonic resonant state in a photodetector is relevant for various applications,including investigating in situ adaptive detection property changes,depending on the situation,and performing single-pixel spectroscopy in geometrically limited ***,the spectral responsivity change with conventional reconfiguration methods is relatively ***,we propose a plasmonic photodetector that reconfigures its spectral responsivity with electromechanical deformation instead of bias *** photodetector consists of a gold plasmonic grating formed on an n-type silicon cantilever,and the spectral responsivity is reconfigured by electromechanically scanning at an incident angle to the grating on the *** photodetector exhibits peak shifts in spectral responsivity in a wavelength range from 1250 to 1310 nm after electromechanical ***,for potential future applications,we demonstrate near-infrared spectroscopy using the *** photodetector has the potential to be adopted as a near-infrared spectrometer in industrial silicon imaging systems because its structure enables subbandgap photodetection on silicon by a Schottky junction.

关键词： tuning reconfigurable resonant