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Microsystems & Nanoengineering 2024年第2期10卷 133-141页

作者： Tatsuya Fukuta Ryo Kato takuo tanaka Taka-aki Yano Institute of Post-LED Photonics Tokushima University2-1 Minami-JosanjimaTokushima770-8506Japan Innovative Photon Manipulation Research Team RIKEN Center for Advanced PhotonicsWakoSaitama351-0198Japan Metamaterials Laboratory RIKEN Cluster for Pioneering ResearchWakoSaitama351-0109Japan

Silicon nanostructures with unique Mie resonances have garnered considerable attention in the field of ***,we present a simple and efficient method for the fabrication of silicon(Si)nanoparticle substrates using continuous-wave(CW)laser *** resulting silicon nanoparticles exhibit Mie resonances in the visible region,and their resonant wavelengths can be precisely ***,laser-annealed silicon nanoparticle substrates show a 60-fold enhancement in *** tunable and fluorescence-enhancing silicon nanoparticle platform has tremendous potential for highly sensitive fluorescence sensing and biomedical imaging applications.

关键词： nanoparticles annealing resonant

Edge enhanced depth perception with binocular meta-lens

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Opto-Electronic Science 2024年第09期 6-16页

作者： Xiaoyuan Liu Jingcheng Zhang Borui Leng Yin Zhou Jialuo Cheng Takeshi Yamaguchi takuo tanaka Mu Ku Chen Department of Electrical Engineering City University of Hong Kong Centre for Biosystems Neuroscienceand Nanotechnology City University of Hong Kong The State Key Laboratory of Terahertz and Millimeter Waves and Nanotechnology City University of Hong Kong Innovative Photon Manipulation Research Team RIKEN Center for Advanced Photonics Metamaterial Laboratory RIKEN Cluster for Pioneering Research Institute of Post-LED Photonics Tokushima University

The increasing popularity of the metaverse has led to a growing interest and market size in spatial computing from both academia and industry. Developing portable and accurate imaging and depth sensing systems is crucial for advancing next-generation virtual reality devices. This work demonstrates an intelligent, lightweight, and compact edge-enhanced depth perception system that utilizes a binocular meta-lens for spatial computing. The miniaturized system comprises a binocular meta-lens, a 532 nm filter, and a CMOS sensor. For disparity computation, we propose a stereo-matching neural network with a novel H-Module. The H-Module incorporates an attention mechanism into the Siamese network. The symmetric architecture, with cross-pixel interaction and cross-view interaction, enables a more comprehensive analysis of contextual information in stereo images. Based on spatial intensity discontinuity, the edge enhancement eliminates illposed regions in the image where ambiguous depth predictions may occur due to a lack of texture. With the assistance of deep learning, our edge-enhanced system provides prompt responses in less than 0.15 seconds. This edge-enhanced depth perception meta-lens imaging system will significantly contribute to accurate 3D scene modeling, machine vision, autonomous driving, and robotics development.

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Underwater persistent bubble-assisted femtosecond laser ablation for hierarchical micro/nanostructuring

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International Journal of Extreme Manufacturing 2020年第1期2卷 135-154页

作者： Dongshi Zhang Bikas Ranjan takuo tanaka Koji Sugioka RIKEN Center for Advanced Photonics 2-1 HirosawaWakoSaitama 351-0198Japan Innovative Photon Manipulation Research Team RIKEN Center for Advanced PhotonicsWakoSaitama 351-0198Japan Metamaterials Laboratory RIKEN Cluster for Pioneering ResearchWakoSaitama 351-0198Japan

In this study,we demonstrate a technique termed underwater persistent bubble assisted femtosecond laser ablation in liquids(UPB-fs-LAL)that can greatly expand the boundaries of surface micro/nanostructuring through laser ablation because of its capability to create concentric circular macrostructures with millimeter-scale tails on silicon ***-tailed macrostructures are composed of layered fan-shaped(central angles of 45°–141°)hierarchical micro/nanostructures,which are produced by fan-shaped beams refracted at the mobile bubble interface(.50°light tilt,referred to as the vertical incident direction)during UPB-fs-LAL line-by-line *** flow generated during UPB-fs-LAL induces bubble *** scanning(e.g.1mms−1)allows a long bubble movement(as long as 2mm),while slow scanning(e.g.0.1mms−1)prevents bubble *** persistent bubbles grow considerably(*** of microns in diameter)due to incubation effects,they become sticky and can cause both gas-phase and liquidphase laser ablation in the central and peripheral regions of the persistent *** generates low/high/ultrahigh spatial frequency laser-induced periodic surface structures(LSFLs/HSFLs/UHSFLs)with periods of 550–900,100–200,40–100 nm,which produce complex hierarchical surface structures.A period of 40 nm,less than 1/25th of the laser wavelength(1030 nm),is the finest laser-induced periodic surface structures(LIPSS)ever created on *** NIR-MIR reflectance/transmittance of fan-shaped hierarchical structures obtained by UPB-fs-LAL at a small line interval(5μm versus 10μm)is extremely low,due to both their extremely high light trapping capacity and absorbance characteristics,which are results of the structures’additional layers and much finer *** the absence of persistent bubbles,only grooves covered with HSFLs with periods larger than 100 nm are produced,illustrating the unique attenuation abilities of laser properties(*** rate,energy,inciden

关键词： hierarchical micro/nanostructures persistent bubble femtosecond laser surface structuring beam refraction fan-shaped microstructure LIPSS

Metalenses for revolutionary imaging

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Photonics Insights 2023年第1期2卷 144-145页

作者： Mu Ku Chen takuo tanaka Department of Electrical Engineering City University of Hong KongHong KongChina Innovative Photon Manipulation Research Team RIKEN Center for Advanced PhotonicsSaitamaJapan Metamaterial Laboratory RIKEN Cluster for Pioneering ResearchSaitamaJapan Institute of Post-LED Photonics Tokushima UniversityTokushimaJapan

Imaging tasks are becoming increasingly complex due to continuous high-tech advancements and the proliferation of personal *** the high-resolution displays on our smartphones and laptops to advancedmedical imaging systems,imaging systems are constantly being pushed to their *** complexity increases,more advanced optics are required.

关键词： becoming optics evolutionary

Effects of heavy,repeated bark stripping by Cervus nippon on survival of Abies veitchii in a subalpine coniferous forest in central Japan

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Journal of Forestry Research 2020年第4期31卷 1139-1145页

作者： takuo Nagaike Yamanashi Forest Research Institute Saisyoji 2290-1FujikawaYamanashi 400-0502Japan

The management of deer impacts on forested lands requires quantification of the negative factors(e.g.,bark stripping)on tree survival in relation to other ecological variables(e.g.,competition from neighboring trees).This study measured the effects of bark stripping by sika deer,Cervus nippon,and competition among trees on the survival of Abies veitchii in a subalpine coniferous forest in central Japan over 12 *** of the trees subjected to bark stripping by deer were small(65%of the stem circumference stripped)were severely *** effect on longevity for each tree after bark stripping was explained by maximum bark stripping intensity during the study period,rather than initial bark stripping ***>85%of the stem circumference had been stripped,survival rates *** stripping influenced survival rates much more than competition from neighboring *** bark stripping occurred repeatedly,frequent measurements are important to grasp the full effects caused by this *** bark stripping of a stem enhances tree ***,management of bark stripping is an essential element of stand maintenance and species composition in subalpine coniferous forests in Japan.

关键词： Bark stripping Mt.Fuji Mortality Regeneration Sika deer

Susceptible conditions for debarking by deer in subalpine coniferous forests in central Japan

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Forest Ecosystems 2016年第1期3卷 63-69页

作者： Hayato lijima takuo Nagaike Yamanashi Forest Research Institute Saisyoji 2290-1FujikawaYamanashi 400-0502Japan

Background： Recently, deer have expanded their distribution to higher altitude ranges including subalpine forests However, culling deer and construction of deer fence in subalpine forests are difficult because of steep slopes and complex topography. Thus it is necessary to clarify the factors which are associated with debarking by deer for the effective protection of subalpine forests. In this study, we examined which factors are associated with debarking b： sika deer （Cervus nippon） in subalpine coniferous forests. Methods： We conducted our survey in Minami-Alps National Park, central Japan. We established 24 10 m × 40 m plots and surveyed the occurrence of debarking on saplings 〉30 cm in height and 〈3 cm in diameter at breast heigh （DBH） and on trees 〉3 cm in DBH, as well as sapling density within each plot. Minimum distances to nearest grasslan（ of plots were calculated （tentatively assuming grassland would attract deer and would cause high debarking pressure in the surrounding subaipine forests）. Results： The mean percentage of debarked live saplings was higher than that of live trees. The mean percentage of debarked saplings which had already died was 81.6 %. Debarking of saplings increased with lower elevation taller sapling size, and marginally increased near grassland. Sapling density was lower in plots with low basa area of conspecific trees near grassland and differed among species. Sapling density marginally decreased with decreasing elevation and increasing stand tree density. Debarking of trees was positively related to small DBH and Io~ elevation, and marginally increased near grassland and differed among species. Conclusions： Our results suggest that tall saplings in subalpine forests of low elevation or near subalpine grassland were susceptible to debarking by deer and monitoring of these areas may permit the early detection of the impacts of deer in subalpine coniferous forests.

关键词： Abies Cervus nippon Debarking Grassland Picea Sapling density Subalpine region

CONSERVATION LAWS IN FINITE MICROCRACKING BRITTLE SOLIDS

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Acta Mechanica Solida Sinica 2005年第3期18卷 189-199页

作者： Wang Defa Chen Yiheng Fukui takuo Department of Civil Engineering Xi＇an University of Technology Xi＇an 710048 China Department of Engineering Mechanics Xi＇an Jiaotong University Xi＇an 710049 China Department of Architecture and Civil Engineering Fukui University Fukui 910-8507 Japan

This paper addresses the conservation laws in finite brittle solids with microcracks. The discussion is limited to the 2-D cases. First, after considering the combination of the Pseudo-Traction Method and the indirect Boundary Element Method, a versatile method for solving multi-crack interacting problems in finite plane solids is proposed, by which the fracture parameters （SIF and path-independent integrals） can be calculated with a desirable accuracy. Second, with the aid of the method proposed, the roles the conservation laws play in the fracture analysis for finite microcracking solids are studied. It is concluded that the conservation laws do play important roles in not only the fracture analysis but also the analysis of damage and stability for the finite microcracking system. Finally, the physical interpretation of the M-integral is discussed further. An explicit relation between the M-integral and the crack face area, i.e., M = GS, has been discovered using the analytical method, which can shed some light on the Damage Mechanics issues from a different perspective.

关键词： conservation laws finite microcracking solids pseudo-traction method boundary element method stress intensity factors

Rotational Motions Excited by Vertical Harmonic Motions

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第1期35卷 51-57页

作者： Tadokoro Chiharu Kadowaki Kei Mori Hiroki Nagamine takuo Department of Mechanical Engineering Saitama University Department of Mechanical Engineering Kyushu University

Rotation of a pair of wings was driven by the vertical harmonic motion of a pin inserted into the center hole of the *** elucidate the mechanism by which the rotational motion of the wings was excited,the relationship between the wings and the pin was examined by tracking their motions using both displacement measurements and high-speed *** motion modes occurred in this study were categorized into five types:slipping,rolling,jumping(without eccentricity),jumping(with eccentricity),and *** the case that the hole of the wings was located at a distance from the center of the wings,referred to as″with eccentricity,″the slipping,jumping(with eccentricity),and non-rotation modes *** experimental results showed that the mechanism of the jumping(with eccentricity)was different from that of the other modes(slipping,rolling,jumping(without eccentricity)),which are well known to be driven by the periodical reaction of the wings against the vertical vibration of the *** was found that the jumping(with eccentricity)was driven by the non-periodical force with the collision between the wing hole and the pin.

关键词： motion transformation rotation vibration hula-hoop

Effect of wood density and water permeability on wood decomposition rates of 32 bornean rainforest trees

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Journal of Plant Ecology 2014年第4期7卷 356-363页

作者： Sanae Mori Akira Itoh Satoshi Nanami Sylvester Tan Lucy Chong takuo Yamakura Laboratory of Plant Ecology Graduate School of ScienceOsaka City UniversitySugimoto 3-3-138Sumiyoshi-kuOsaka 558-8585Japan Center for Tropical Forest Science Smithsonian Tropical Research Institute and the Arnold ArboretumHarvard University22 Divinity AvenueCambridgeMA 02138USA Applied Forest Science and Industry Development Sarawak Forestry CorporationJalan TapangKota SentosaKuching 93250SarawakMalaysia

Aims a better understanding of wood litter decomposition is essential for predicting responses of forest ecosystems to global climate *** studies suggest that chemical properties of wood litters,rather than physical ones such as wood density,are more important for inter-specific differences in wood decomposition ***,empirical data are still limited,especially for tropical *** addition,decom-position rate of wood litter often varies with time,which makes inter-specific comparison *** studied the wood decomposition of 32 rainforest trees to elucidate(i)the degree of interspecific variation in wood decomposition rate of a given size and configuration and(ii)if initial wood density and water permeability are consistent predictors of the overall decomposition rate and its pattern over *** a common garden decomposition experiment was conducted in a tropical rainforest in malaysian borneo for 32 native tree *** wood sticks were set on the forest floor and the weight loss was monitored monthly for 2.7 *** Findings We found large variation in the wood decomposition rate(a 49-fold range),suggesting that we need to consider this variation when cal-culating community-level carbon dynamics of tropical rain *** physical traits of wood,*** density and water permeability,were related to wood decomposition rate and its pattern over *** half-time related positively and negatively to initial wood density and water permeability,*** time-dependentrate model fitted better for 18 species(56%of the study species)that had higher water permeabilities than the others,suggesting that micelle porosity in wood relates to temporal changes in decomposition rate.

关键词： Sarawak carbon dynamics fine wood litter wood density tropical rain forest

Designing a Comprehensive Skill Evaluation and Vocational Ability Development Program for FTTH Installer

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Computer Technology and Application 2015年第1期6卷 5-13页

作者： takuo Kikuchi Information and Communication Engineering Unit Polytechnic University Tokyo 187-0035 Japan

Recently, FTTH （fiber to the home） is spreading rapidly, and communication technology has become an indispensable part in our lives. FTTH installers who build the infi＇astructure must correspond to the progress of technology while ensuring a high quality of installation, and it is struggling to its counterpart. The present study is undertaken in order to propose effective vocational ability development program for FTTH installers from the approach of their skill. They are information network cabling-related qualification system and competitions as the ability evaluation system. Then the author concludes that this program makes a contribution to improving their skill and maintaining the quality of the optical fiber network in analyzing some example of actual installation work and the measurement result of the OTDR（optical time domain reflect） meter.

关键词： Vocational ability development program FTTH installer installation skill evaluation system.