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Journal of Energy Chemistry 2016年第2期25卷 304-308页

作者： Nobuhiro Ishito Kenji Hara kiyotaka nakajima Atsushi Fukuoka Institute for Catalysis Hokkaido University Graduate School of Chemical Sciences and Engineering Hokkaido University School of Engineering Tokyo University of Technology

Thermal decomposition of formic acid on SiO2, CeO2 and γ-Al2O3 was studied as an elementary step of reverse water–gas shit reaction（RWGS） over supported Au catalysts. γ-Al2O3 showed the highest CO selectivity among the tested oxides in the decomposition of formic acid. Infrared spectroscopy showed the formation of four formate species on γ-Al2O3： three η~1-type and one μ~2-type species, and these formates decomposed to CO at 473 K or higher. Au-loaded γ-Al2O3 samples were prepared by a depositionprecipitation method and used as catalysts for RWGS. The supported Au catalyst gave CO with high selectivity over 99% from CO2 and H2, which is attributed to the formation of formates on Au and subsequent decomposition to CO on γ-Al2O3.

关键词： Reverse water–gas shift reaction Carbon dioxide Hydrogen Formate Carbon monoxide Alumina Gold

Seamless multistage laser-plasma acceleration toward future high-energy colliders

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Light(Science & Applications) 2018年第1期7卷 862-864页

作者： Kazuhisa nakajima High Energy Accelerator Research Organization Tsukuba 305-0801Japan

Multistage laser wakefield accelerators that are coupled with variable-curvature plasma channels make it possible to efficiently accelerate electrons to high energies that exceed dephasing and pump depletion *** coupling between laser and particle beams may envisage future energy-frontier colliders of revolutionarily small size and cost.

关键词： acceleration curvature frontier

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

Molecular phylogenetic relationships of Eastern Asian Cyprinidae(Pisces:Cypriniformes)inferred from cytochrome b sequences

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Science China(Life Sciences) 2004年第2期47卷 130-138页

作者： Masayuki Kuwahara Tsuneo nakajima Lake Biwa Museum 1091 Oroshimo Kusatsu Shiga 525 JapanLake Biwa Museum 1091 Oroshimo Kusatsu Shiga 525 Japan

Complete mitochondrial cytochrome b sequences of 54 species, including 18 newly sequenced, were analyzed to infer the phylogenetic relationships within the family Cyprinidae in East Asia. Phylogenetic trees were generated using various tree-building methods, including Neighbor-joining (NJ), Maximum Parsimony (MP) and Maximum Likelihood (ML) methods, with Myxocyprinus asiaticus (family Catostomidae) as the designated outgroup. The results from NJ and ML methods were mostly similar, supporting some existing subfamilies within Cyprinidae as monophyletic, such as Cultrinae, Xenocyprinae and Gobioninae (including Gobiobotinae). How-ever, genera within the subfamily 揇anioninae?did not form a monophyletic group. The subfamily Leuciscinae was divided into two unrelated groups: the Leuciscinae in East Asia forming as a monophyletic group together with Cultrinae and Xenocyprinae, while the Leuciscinae in Europe, Siberia, and North America as another monophyletic group. The monophyly of subfamily Cy-prininae sensu Howes was supported by NJ and ML trees and is basal in the tree. The position of Acheilognathinae, a widely accepted monophyletic group represented by Rhodeus sericeus, was not resolved.

关键词： Cyprinidae, cytochrome b, molecular phylogeny, Pisces.

Novel efficient THz undulator using a laser-driven wire

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Light(Science & Applications) 2017年第1期6卷 408-409页

作者： Kazuhisa nakajima Center for Relativistic Laser Science Institute for Basic Science(IBS)Gwangju 61005Korea

Terahertz(THz=10^(12) cycles per second,or T-ray)radiation sources are indispensable for modern materials science,chemical and biomedical imaging and sensing,as well as for a broad range of applications in diagnostic systems and advanced telecommunications1,*** electromagnetic spectrum of the THz radiation is loosely characterized by the frequency range of 0.1−10 THz,or wavelengths between 30μm and 3 *** particular,a low photon energy of 4.2 meV or 48 K at 1 THz,which is less than the thermal energy at room temperature,allows precise measurements with a simplified setup and very high signal-to-noise ratio in time-domain pulsed THz *** the spectral region is located on the boundary between electronics and photonics,the diversity of the THz sources relies on either frequency up-conversion of electronic sources,such as solid-state photo-switches and radio-frequency(RF)electron-beam accelerators3,or frequency down-conversion of optical sources,such as optical rectification2,3 in nonlinear optical processes and laser-gas interaction induced by twocolor *** technologies,however,exploit ultrashort pulse lasers as a *** a recent publication,Tian et al.4 at Shanghai Institute of Optics and Fine Mechanics(SIOM)and Nankai University developed a new THz radiation source using a laser-driven wire that generates a femtosecond electron bunch and helical undulator fields to emit THz synchrotron radiation with high efficiency.

关键词： laser undulator precise

STRUCTURE AND DYNAMICS OF POLYMERIC MATERIALS IN NANO-SCALE

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Chinese Journal of Polymer Science 2011年第1期29卷 43-52页

作者： Toshio Nishi So Fujinami Ken nakajima WPI Advanced Institute for Materials Research Tohoku University

The nano-palpation technique, i.e., nanometer-scale elastic and viscoelastic measurements based on atomic force microscope, is introduced. It is demonstrated to be very useful in analyzing nanometer-scale materials properties for the surfaces and interfaces of various types of soft materials. It enables us to obtain not only structural information but also mechanical information about a material at the same place and at the same time.

关键词： Nano-palpation Atomic force microscope Soft material Young's modulus Viscoelasticity.

Gravitational-wave equation in effective one-body background for spinless binary

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Science China(Physics,Mechanics & Astronomy) 2023年第7期66卷 29-37页

作者： Ya Guo Hiroaki nakajima Wenbin Lin School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031China School of Mathematics and Physics University of South ChinaHengyang 421001China

The effective one-body method provides a framework to apply the black hole perturbation theory to the binary system where two masses can be *** study the gravitational-wave equation in the background of the effective one-body system for the spinless binary,which is in general available with the spherically symmetric background as *** obtain the gauge conditions for the decoupled wave equation,and also give the solutions to the gauge conditions in terms of the metric perturbation for a special case,which extends the result by Jing et al.(***.65,260411(2022)).Finally we obtain the gravitational-wave equation which is the generalization of the Teukolsky equation.

关键词： gravitational-wave equation Teukolsky equation effective one-body system Newman-Penrose formalism

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Report on IAMAS Activity since 2015 and the IAPSO-IAMAS-IAGA Scientific Assembly--Good Hope for Earth Sciences

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Advances in Atmospheric Sciences 2018年第4期35卷 371-375页

作者： John TURNER Teruyuki nakajima British Antarctic Survey High Cross Madingley Road Cambridge CB3 0ET United Kingdom Japan Aerospace Exploration Agency 2-1-1 Sengen Tsukuba Ibaraki 305-8505 Japan

Three associations of the International Union of Geodesy and Geophysics （IUGG）--International Association for the Physical Sciences of the Oceans （IAPSO）, International Association of Meteorology and Atmospheric Sciences （IA- MAS） and International Association of Geomagnetism and Aeronomy （IAGA）--held their joint Scientific Assembly over 27 August-1 September in Cape Town, South Africa. This was the first full IAMAS assembly to be held in Africa （Figs. 1 ＆ 2）.

关键词： MAS Good Hope for Earth Sciences Report on IAMAS Activity since 2015 and the IAPSO-IAMAS-IAGA Scientific Assembly

The effect of mast cell on the induction of Helicobacter pylori infection in Mongolian gerbils

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World Journal of Gastroenterology 2000年第3期6卷 440-441页

作者： S nakajima T Hattori First Department of Pathology ShigaUniversity Of Medical SciencesJapan

INTRODUCTION Since 1982,Helicobacter pylori(Hp) has been successfully isolated and cultured,and the fact many diseases such as gastritis,peptic ulcer,gastric carcinoma

关键词： diseases models animal Mongolian gerbils Helicobacter pylori mast cell Helicobacter infections

POLYAMINOACIDS AS BIOMATERIALS

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Chinese Journal of Polymer Science 1989年第3期7卷 193-201页

作者： AKIO nakajima Department of Applied Chemistry Osaka Institute of TechnologyOhmiyaAsahi-kuOsaka 535Japan

This paper surveys the author’s, investigations on block-, random-, and oligo-polyaminoacids as materials with potential towards their biomedical applications. Theoretical considerations are made on the formation of novel microheterophase structures as revealed by peptide-elastomer-peptide type block copolymers, and their mechanical and dynamic mechanical behaviors of the mem-

关键词： Poly POLYAMINOACIDS AS BIOMATERIALS EBE BG AS