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Performance of a Thermal Bipedal Walker on Inclined Surfaces with Different Leg CoMs

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Journal of Bionic Engineering 2019年第3期16卷 540-549页

作者： Lingchao Su Takeru nemoto Akio Yamamoto Department of Precision Engineering School of Engineering The University of Tokyo Japan

This paper investigates the walking performance of a thermal walker on various inclined surfaces. The thermal walker can walk only by ground heat energy using bimetal sheets. The walking performance on slopes is analyzed using a simplified walker model. The analytical result is compared with the two sets of walking experiments, on slopes with either pitch or roll inclinations. The analyses and the experiments are done with different Center-of-Mass (CoM) positions of the legs, which considerably influence the walking performance. It was found that, on up/down slopes, the stride of the thermal walker changes almost linearly with the slope angle. When the CoM was close to the center of the walker body, the walker walked backward on upward slopes. With CoM largely shifted backward, the walker could walk up slopes but did not walk down slopes well. On the other hand, when walking along a contour line of a slope, the stride decreased as the slope angle increased. The smaller leg swing distances would be caused by the change of leg swing time on such slopes.

关键词： bipedal walker bimetal thermal walker thermal actuator slope

The spectral changes of partially coherent light focused by an apertured lens with chromatic aberration

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Chinese Optics Letters 2004年第4期2卷 239-242页

作者：蒲继雄蔡超 Shojiro nemoto Department of Electronic Science and Technology Huaqiao University Quanzhou 362011 Institute of Information Sciences and Electronics University of TsukubaTsukubaIbaraki 305-8573 Japan Institute of Information Sciences and Electronics University of TsukubaTsukuba Ibaraki 305-8573 Japan

The spectral changes of a partially coherent polychromatic light focused by an apertured lens with chromatic aberration are investigated. It is demonstrated that the spectrum in the focused field is different from that in the aperture. Comparing with the spectrum in the aperture, the spectrum in the focused field shifts to lower or higher frequency, which is defined as a spectral shift. The influence of chromatic aberration of the lens, the coherence of the partially coherent light in the aperture, the radius of the aperture, and the spectral width of the spectrum of the aperture on the spectral shift are investigated in detail. The numerical results show that these parameters affect the spectral shift noticeably.

关键词： Coherence

DISLOCATION PINNING IN HIGH TEMPERATURE DEFORMED Ni_3(Al,Ti) SINGLE CRYSTALS CONTAINING DISORDERED γ PRECIPITATES

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Acta Metallurgica Sinica(English Letters) 2006年第3期19卷 157-164页

作者： W.H. Tian M. nemoto Department of Materials Physics and Ghemistry University of Science and Technology Beijing Beijing 100083 China Sasebo National Gollege of Technology Okishin 1-1 Sasebo 857-1193 Japan

A transmission electron microscopy （TEM） investigation has been performed on the dislocation pinning in Lie-ordered Ni3（Al, Ti） containing disordered γ *** morphology of deformation induced dislocations in the γ base alloys containing fine dispersion of disordered γ was investigated by means of weak-beam electron microscopy. The superdislocations are strongly attracted to the disordered particles and dissociate on the （111） plane in the γ particles, while they dissociate on the （010） plane in the γ＇ matrix. The disordered γ precipitates play an important role as a pinning point during the cross-slip of superdislocations from （111） to （010） planes in the γ matrix and restrain the cross-slip of superdislocations. The interaction of superdislocations with disordered particles causes the formation of superkinks, jogs and closed loops.

关键词： superdislocation precipitate attractive interaction cross slip Ll2-ordered Ni3Al

CNN-based segmentation frameworks for structural component and earthquake damage determinations using UAV images

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Earthquake Engineering and Engineering Vibration 2023年第2期22卷 359-369页

作者： Taisei Saida Muhammad Rashid Yudai nemoto Shota Tsukamoto Takehiko Asai Mayuko Nishio Graduate School of Science and Technology University of TsukubaTsukubaJapan Faculty of Engineering Information and SystemsUniversity of TsukubaTsukubaJapan

Buildings undergo various kinds of structural damage during earthquakes,and damage detection and functional assessment of these structures in the aftermath of the events have been challenging *** these circumstances,computer vision techniques offer a promising solution by automating the inspection *** study presents an effective methodology for automatic structural components and damage detection using unmanned aerial vehicle(UAV)images of damaged *** types of neural network architectures are considered for appropriate feature extractions in different task *** feature pyramid network(FPN)is employed for crack,spall,rebar,and component damage segmentation,while the UNet++network is utilized for the damage *** network training and validation,a total of 3805 original images of size 1920×1080 pixels are processed by the proposed method and reduced the image *** the FPN,the achieved highest intersection over unions(IoUs)were 0.59,0.93,0.42,and 0.99 for crack,spall,rebar,and components,*** predicted labels were found in close agreement with the ***,the UNet++recognized the semantic information and damage state with an IoU of *** demonstrated the applicability of the proposed method for automated post-earthquake building inspection process accurately without information loss from the original images.

关键词： computer vision semantic segmentation component segmentation damage evaluation FPN UNet++

Establishment of a function embodiment knowledge base for supporting service design

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Science China(Information Sciences) 2012年第5期55卷 1008-1018页

作者： nemoto Yutaro AKASAKA Fumiya CHIBA Ryosuke SHIMOMURA Yoshiki Department of System Design Tokyo Metropolitan University

In service engineering,a service is represented as a functional structure that satisfies customer *** entities and their activities are associated with a functional structure as a way to accomplish a *** this phase,it is important for service designers to have broad knowledge,since entities that construct a service include both human and physical ***,the extent of the designer's knowledge is the key to the enhancement of design ***,few tools to support designers in the embodiment phase have been *** this paper,for the purpose of constructing a function embodiment knowledge base in service design,the representational form of knowledge is proposed,and a prototype system of function embodiment knowledge base is *** function embodiment knowledge is collected from multiple service cases using the prototype system,and the effectiveness of knowledge base is discussed.

关键词： service engineering service design design knowledge management embodiment knowledge base

PRECIPITATION BEHAVIOR IN A Cu-Sn-Ni-Zn-P LEAD FRAME MATERIAL

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Acta Metallurgica Sinica(English Letters) 2003年第3期16卷 155-160页

作者： W.H.Tian C.K.Yan M.nemoto Department of Materials Physics and Chemistry University of Science and Technology BeijiingBeijing 100083ChinaInstitute of Metal ResearchThe Chinese Academy of SciencesShenyang 110016ChinaSasebo National College of Technology Okishin 1-1 Sasebo 857-1193 Japan

Transmission electron microscopy (TEM) observations were carried out for examining the precipitation behavior in a Cu-Sn-Ni-Zn-P lead frame material. TEM observations revealed that the precipitate is hexagonal Ni5P2 and the orientation relationship between the Cu matrix and Ni$Pi precipitate is (111)fcc//(0001)hcp, [101]fcc//[1120]hcp, where the suffix fcc denotes the Cu matrix and hep denotes the hexagonal Ni5P2 precipitate. The Ni5P2 precipitate is ovoidal in shape at the beginning of aging at lower temperature. By prolonging the aging time or increasing the aging temperature, Ni5P2 precipitate grows and shows a rod-like shape. The Ni added Cu based lead frame material has a comparative mechanical properties with that of TAMAC15 which has been developed and used in electrical industry.

关键词： lead frame materials mechanical properties atom diffusion precipitate transmission electron microscopy

HARDENING OF L1_2-ORDERED Co_3Ti BY PRECIPITATION OF FCC-Co PHASE

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Acta Metallurgica Sinica(English Letters) 1998年第1期11卷 33-38页

作者： W.H.Tian S.L.Hu M.nemoto Univ of Science and Technology Beijing Beijing China

The Co3 Ti phase hardens appreciably by the fine precipitation of disordered fcc Co-rich phase upon aging after quenching from solution annealing temperature. Transmission electron microscope (TEM)observations revealed that the precipitates are platelet in shape, lying nearly parallel to the {100} planes of the L12-ordered matrix, and perfectly coherent with the matrix lattice at the beginning of aging. The high temperature strength increases appreciably with the fine precipitation of disondered Co-rich phase over the whole temperature range investigated. TEM observations of the deformed alloys after underaging revealed that saperdislocations are pinned by precipitates indicating an attractive interaction between dislocations and precipitates.

关键词： Co_3 Ti age-hardening precipitate deformation mechanism microstructure

Effects of Bare-Ground Revegetation Techniques Using Imperata cylindrica on Changes in the Plant Cover and Species Richness during Early Succession

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Open Journal of Ecology 2016年第8期6卷 471-483页

作者： Susumu Yamada Masayuki nemoto Institute for Agroecosystem Services Graduate School of Agricultural and Life Sciences University of Tokyo Tokyo Japan

Riverdikes are habitats that must be revegetated quickly in order to prevent soil erosion. With increasing pressure to improve the cost efficiency of management, new revegetation techniques suitable under reduced mowing frequencies are required. Imperata cylindrica (L.) P. Beauv. is an important component of grasslands in several Asian countries. Its vigorous rhizome elongation should be useful for quickly covering bare ground. We tested the effects of sowing (at two densities), transplanting, and sodding of I. cylindrica on plant cover and species richness of established vegetation over 3 years. The sodding and high-density sowing treatments achieved the most rapid increase in cover, followed by low-density sowing, transplanting, and the control. By year 2, however, the cover in the low- and high-density sowing treatments was similar. The sodding treatment had significantly fewer species than the other treatments in year 1. Between years 1 and 2 and years 2 and 3, the total number of species increased in the transplanting treatment, whereas it decreased in the sodding and two sowing treatments. Accordingly, if stabilization and erosion control are the priority, introduction of I. cylindrica using sod and high-density sowing is the most suitable method. If immediate green-up is not imperative, low-density sowing is likely to provide available resources for new seedlings of diverse species to become established, allowing the introduction of representative species in semi-natural grasslands. More research will be needed on the effects of introducing diverse species (e.g., sowing seed mixtures) that include I. cylindrica on the resulting floristic composition.

关键词： Restoration Riverdike Sod Sowing Transplanting

Demonstrative Study of Vehicles Using Waste Vegetable Oil as Fuel

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Journal of Energy and Power Engineering 2015年第2期9卷 185-191页

作者： Yasuyuki nemoto Izumi Ushiyama Division of Renewable Energy and Environment Ashikaga Institute of Technology Ashikaga-shi 326-8558 Japan Graduate School Ashikaga Institute of Technology Ashikaga-shi 326-8558 Japan

SVO （straight vegetable oil） method means the direct use of vegetable oil as car fuel through installation of a heater unit in the car to decrease vegetable oil viscosity. In this study, the authors carried out performance tests on the direct use of waste cooking oil using a car with a heater unit, Moreover, the authors carried out long run driving on road tests in five years using a public car of Minami-Aizu Town in Fukushima Prefecture and analyzed the case of troubles and clarified the availability and problems of SVO vehicles. As a result, the car with a heater unit shows similar performance in both cases using vegetable oil or diesel fuel as fuel. The tested SVO vehicle of Minami-Aizu Town could be driven 38,127 km mainly by waste vegetable oil with a total driving distance of 52,293 km in long run driving tests in five years, and decreased about 3,813.5 liters of light oil which corresponds to 9.99 t of CO2.

关键词： Waste cooking oil straight vegetable oil bio-fuel.