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Holography and speckle in phase-shifting digital holography(Invited Paper)

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Chinese Optics Letters 2009年第12期7卷 1104-1108页

作者： Ichirou yamaguchi Toyo Seiki Seisakusyo 1-2-6 Funado Itabashi-kuTokyo 174-0041 Japan

The correlation properties of the optical field diffusely reflected from a rough surface under coherent illumination are analyzed numerically. The cross-correlations of the complex amplitudes and the intensities before and after translation and/or tilt of the surface are calculated at an arbitrary observation plane in three-dimensional （3D） space. The results provide us with the 3D distributions of phase changes and speckle displacement that lead to the distributions measured by holographic interferometry and speckle relationships and physical interpretation of them are and signal-to-noise ratio of the displacement to be correlation technique. Comparisons with analytical also discussed.

关键词： CCD Holography and speckle in phase-shifting digital holography

Visible light responsive photocatalysts developed by substitution with metal cations aiming at artificial photosynthesis

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Frontiers in Energy 2021年第3期15卷 568-576页

作者： Yuichi yamaguchi Akihiko KUDO Department of Applied Chemistry Faculty of ScienceTokyo University of ScienceTokyo 162-8601Japan

To solve resource,energy,and environmental issues,development of sustainable clean energy system is strongly *** recent years,hydrogen has been paid much attention to as a clean *** hydrogen production by water splitting using a photocatalyst as artificial photosynthesis is a promising method to solve these *** utilization of visible light comprised of solar light is essential for practical *** strategies,i.e.,doping,control of valence band,and formation of solid solution are often utilized as the useful methods to develop visible light responsive *** minireview introduces the recent work on visible-light-driven photocatalysts developed by substitution with metal cations of those strategies.

关键词： visible light responsive photocatalyst water splitting artificial photosynthesis:metal ion substitution

Nano-structural Modification of Amorphous Carbon Thin Films by Low-energy Electron Beam Irradiation

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材料热处理学报 2004年第05B期25卷 1247-1252页

作者： Eiji Iwamura Masanori yamaguchi PRESTO Japan Science and Technology Agency Tokyo JapanLamp Company Ushio INC. Himeji Japan

A new approach using a low-energy electron beam radiation system was investigated to synthesize carbon hybrid structures in amorphous carbon thin films. Two types of amorphous carbon films, which were 15at% iron containing film and with column/inter-column structures, were deposited onto Si substrates by a sputtering technique and subsequently exposed to an electron shower of which the energy and dose rate were much smaller compared to an intense electron beam used in a transmission electron microscopy. As a result of the low-energy and low-dose electron irradiation process, graphitic structures formed in amorphous matrix at a relatively low temperature up to 450 K. Hybrid carbon thin films containing onion-like structures in an amorphous carbon matrix were synthesized by dynamic structural modification of iron containing amorphous carbon thin films. It was found that the graphitization progressed more in the electron irradiation than in annealing at 773 K, and it was attributed to thermal and catalytic effects which are strongly related to grain growth of metal clusters. On the other hand, a reversal of TEM image contrast was observed in a-C films with column/inter-column structures. It is presumed that preferable graphitization occurred in the inter-column regions induced by electron irradiation.

关键词：无定形碳溅射石墨化低能电子注辐射毫微结构

Flow Visualization around a Double Wedge Airfoil Model with Focusing Schlieren System

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Journal of Thermal Science 2006年第1期15卷 31-36页

作者： Masashi KASHITANI Yutaka yamaguchi Department of Aerospace Engineering National Defense Academy 1-10-20 Hashirimizu Yokosuka Kanagawa 239-8686Japan

In the present study, aerodynamic characteristics of the double wedge airfoil model were investigated in a transonic flow by using the shock tube as an intermittent wind tunnel. The driver and driven gases of the shock tube are dry air. The airfoil model of double wedge has the span of 58 mm, chord length c = 75 mm and its maximum thickness is 7.5 mm. The apex of the double wedge airfoil model is located on the 35% chord length from the leading edge. The range of hot gas Mach numbers are from 0.80 to 0.88, and the Reynolds numbers based on chord length are 3.11× 10^5- 3.49× 10^5, respectively. The flow visualizations were performed by the sharp focusing schlieren method which can visualize the three dimensional flow fields. The results show that the present system can visualize the transonic flowfield clearer than the previous system, and the shock wave profiles of the center of span in the test section are visualized

关键词： shock wave schlieren method transonic flow double wedge airfoil model

Computer-generated holograms for 3D display(Invited Paper)

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Chinese Optics Letters 2009年第12期7卷 1079-1082页

作者： Hiroshi Yoshikawa Takeshi yamaguchi Department of Electronics and Computer Science Nihon University

We have been studying various types of computer-generated holograms for three-dimensional （3D） displays both for a real-time holographic video display and a hard copy, or a printed hologram. For the hard copy output, we have developed a direct fringe printer, which is achieved to print over 100 gigapixels computer-generated hologram with 0.44μm pitch. In this paper, we introduce our recent progresses on the rainbow hologram, the cylindrical holograms, and the disk hologram for 3D display.

关键词： Computer-generated holograms for 3D display Figure

Photocatalytic dry reforming of methane by rhodium supported monoclinic TiO_(2)-B nanobelts

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Journal of Energy Chemistry 2022年第8期31卷 562-571,I0015页

作者： Masaru Kushida Akira yamaguchi Masahiro Miyauchi School of Materials and Chemical Technology Tokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo 152-8552Japan

The conversion of methane and carbon dioxide into syngas(dry reforming of methane;DRM)has attracted attention owing to the potential to reuse greenhouse *** dioxide(TiO_(2))-based photocatalysts,which have been widely commercialized owing to their high efficiency,non-toxicity,and low cost,are strongly desired in ***,we report a monoclinic-phase TiO_(2)-B nanobelts-supported rhodium(Rh/TiO_(2)-B nanobelts)catalyst that efficiently promotes DRM under ultraviolet light irradiation at low *** holes in the TiO_(2)-B nanobelts were used to oxidize methane,while the electrons were trapped in rhodium to reduce carbon ***/TiO_(2)-B nanobelts exhibited considerably higher durability and activity than Rh-loaded conventional TiO_(2)(anatase and rutile),owing to the lattice and/or surface oxygen reactivity in TiO_(2)-B nanobelts,which was suggested by X-ray photoelectron spectroscopy measurements and photocatalytic performance tests under an atmosphere of methane *** study paves the path for the effective utilization of methane by constructing active TiO_(2)-based nanometal photocatalysts.

关键词： Photocatalysis Dry reforming of methane Greenhouse gas conversion Gas-phase reaction Titanium dioxide TiO_(2)-B

Estimating reflectance and shape of objects from a single cartoon-shaded image

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Computational Visual Media 2017年第1期3卷 21-31页

作者： Hideki Todo Yasushi yamaguchi Tokyo University of Technology The University of Tokyo

Although many photorealistic relighting methods provide a way to change the illumination of objects in a digital photograph, it is currently difficult to relight digital illustrations having a cartoon shading style. The main difference between photorealistic and cartoon shading styles is that cartoon shading is characterized by soft color quantization and nonlinear color variations that cause noticeable reconstruction errors under a physical reflectance assumption, such as Lambertian reflection. To handle this non-photorealistic shading property, we focus on shading analysis of the most fundamental cartoon shading technique. Based on the color map shading representation, we propose a simple method to determine the input shading as that of a smooth shape with a nonlinear reflectance property. We have conducted simple ground-truth evaluations to compare our results to those obtained by other approaches.

关键词： non-photorealistic rendering cartoon shading relighting quantization

pH-controlled hydrothermal synthesis of titanium phosphates and their powder properties

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Journal of Advanced Ceramics 2014年第4期3卷 326-331页

作者： Hiroaki ONODA Taisuke yamaguchi Department of Informatics and Environmental Sciences Kyoto Prefectural University1-5Shimogamo Nakaragi-cyoSakyo-kuKyoto 606-8522Japan

Titanium phosphates were prepared from titanium chloride and sodium pyrophosphate at various pH in hydrothermal process as a novel white pigment for *** chemical composition,powder properties,photo catalytic activity,colour phase and smoothness were *** obtained materials had a higher Ti/P ratio than that used in preparation conditions because of the formation of titanium oxide and *** samples prepared at pH=4 had particles smaller than 100μ*** phosphates had less photo catalytic activity to protect the sebum on the *** obtained materials in hydrothermal process and their thermal products at 100℃showed high reflectance in the range of visible light.

关键词： titanium phosphates pyrophosphate pH photo catalytic activity smoothness

Study on multimers and their structures in molecular association mixture

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Science China Chemistry 2007年第1期50卷 23-31页

作者： yamaguchi Yoshinori OZAKI Yukihiro Consolidated Research Institute for Advanced Science and Medical Care Waseda UniversityJapan Department of Chemistry School of Science and TechnologyKwansei-Gakuin UniversitySandaHyogo 669-1337Japan

Self-association system of(R)-1,3-butanediol in dilute carbon tetrachloride(CCl4)solution is studied as a model of molecular association *** methods including FSMWEFA(fixed-size moving window evolving factor analysis)combined with PCA(principal component analysis),SIMPLISMA (simple-to-use interactive self-modeling mixture analysis),and ITTFA(iterative target transformation factor analysis)are adopted to resolve infrared spectra of(R)-1,3-butanediol *** number and equilibrium constant are computed.(R)-1,3-butanediol in dilute inert solution is determined as a monomer-trimer equilibrium *** investigation of trimer structures is carried out with DFT(density functional theory),and structural factors are analyzed.

关键词： (R)-1 3-butanediol multimer chemometrics density functional theory