检索结果-南通市图书馆

Evaluation of soil fabric using elastic waves during load-unload

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2023年第10期15卷 2687-2700页

作者： Yang Li Masahide Otsubo Reiko Kuwano Institute of Industrial Science The University of Tokyo4-6-1 KomabaMeguro-kuTokyo153-8505Japan Public Works Research Institute 1-6 MinamiharaTsukubaIbaraki305-8516Japan

It is essential to assess the evolution of soil fabric as it has an important role in the mechanical responses of soils during complex loading *** contribution carries out the physical experiments using three granular materials in the *** variations of compression and shear wave velocities(Vp and Vs)are investigated during load-unload cycles under dry and drained *** discrete element method(DEM)simulations are performed to understand the evolution of soil fabric during the equivalent load-unload cycles using spherical *** and Vs are not always reversible even though the stress state regains its isotropic condition after unload,indicating that Vp and Vs are governed by not only the stress state but also the fabric *** variations of Vp/Vs are density-and stress-dependent;a higher level of stress ratio(s01/s03)threshold is observed for denser packings to trigger a significant change in wave velocity ratio(Vp/Vs)for experimental results using spherical glass beads and simulation data using spherical *** the particle shape,a higher s01/s03 threshold is found for more angular particles than rounded *** DEM result reveals that Vp/Vs of spherical particles can be correlated linearly with the evolution of fabric ratio(Fver/Fhor)during loadunload in a pre-peak range under dry and drained conditions.

关键词： Soil fabric Anisotropy Elastic waves Discrete element modelling Laboratory tests

Performance Evaluation of Electromagnetic Shield Constructed from Open-Cell Metal Foam Based on Sphere Functions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第7期132卷 43-53页

作者： Yuya Hanaoka Taku Itoh Kohei Tateyama Susumu Nakata Keiko Watanabe Graduate School of Industrial Technology Nihon UniversityNarashinoChiba 275-8575Japan College of Industrial Technology Nihon UniversityNarashinoChiba 275-8575Japan College of Science and Engineering Ritsumeican UniversityKusatsuShiga 525-8577Japan College of Information Science and Engineering Ritsumeican UniversityKusatsuShiga 525-8577Japan

This study evaluates the performance of a model of open-cell metal foams generated by sphere *** this end,an electromagnetic shield constructed from the model was inserted between two horn antennas in an electromagnetic wave propagation *** foam-hole diameter in the electromagnetic shield model was varied as d=2.5 and 5.0 mm,and the frequency of the electromagnetic waves was varied from 3 to 13 *** the numerical experiments of shield effectiveness,the shields with foam holes of both diameters attenuated the electromagnetic waves across the studied frequency *** shield effectiveness was enhanced at low frequencies and in the shield with smaller hole diameter.

关键词： Electromagnetic propagation electromagnetic shielding materials metal foams numerical simulation

Cultivating the unseen:Lessons from James Tiedje

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

mLife 2023年第3期2卷 217-223页

作者： Yoichi Kamagata National Institute of Advanced and Industrial Science and Technology(AIST) TsukubaJapan

In recounting *** ***'s outstanding research achievements spanning the past 55 years,it is easy to overlook his early and mid-career ***,his contribution to the aerobic degradation of pesticides and other chemicals,as well as methanogenic degradation of those compounds retains their *** researchers in environmental microbiology have gained invaluable knowledge from these studies,which have been applied to the elucidation of previously uncultivated microorganisms.

关键词： cultivated gained pesticides

Novel synthesis of single-crystalline TbCu_(7)-type Sm-Fe powder by low-temperature reduction-diffusion process using molten salt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第7期40卷 1126-1133页

作者： Shusuke Okada Kenta Takagi Magnetic Powder Metallurgy Research Center National Institute of Advanced Industrial Science and Technology(AIST)2266-98 AnagahoraShimoshidami MoriyamaNagoya463-8560Japan

In this study,molten salt was used as a solvent for calcium(Ca)to let a reduction-diffusion(R-D)reaction occur below the melting point of Ca(1115 K),which is the lower limit temperature of the co nventional RD *** the R-D reaction is conducted below 923 K with LiCl molten salt,submicron-sized TbCu_(7)-type Sm-Fe powder is *** c/a ratio of the powder estimated by a synchrotron X-ray diffraction pattern is 0.8456,which is consistent with the Sm_(0.67)Fe_(5.667)(SmFe_(8.5))*** electron backscatter diffraction analysis reveals that single-crystalline TbCu_(7)-type SmFe_(8.5) powder was synthesized for the first time.

关键词： Reduction-diffusion TbCu_(7) Molten salt Permanent magnet Rare earths

Complex-Valued Neural Networks:A Comprehensive Survey

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第8期9卷 1406-1426页

作者： ChiYan Lee Hideyuki Hasegawa Shangce Gao Faculty of Engineering University of ToyamaToyama 930-8555Japan

Complex-valued neural networks(CVNNs)have shown their excellent efficiency compared to their real counterparts in speech enhancement,image and signal *** throughout the years have made many efforts to improve the learning algorithms and activation functions of *** CVNNs have proven to have better performance in handling the naturally complex-valued data and signals,this area of study will grow and expect the arrival of some effective improvements in the ***,there exists an obvious reason to provide a comprehensive survey paper that systematically collects and categorizes the advancement of *** this paper,we discuss and summarize the recent advances based on their learning algorithms,activation functions,which is the most challenging part of building a CVNN,and ***,we outline the structure and applications of complex-valued convolutional,residual and recurrent neural ***,we also present some challenges and future research directions to facilitate the exploration of the ability of CVNNs.

关键词： Complex activation function complex backpropagation algorithm complex-valued learning algorithm complex-valued neural network deep learning

Strengths,weaknesses,opportunities,and threats(SWOT)analysis of supercapacitors:A review

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第4期79卷 611-638页

作者： Pragati A.Shinde Qaisar Abbas Nilesh R.Chodankar Katsuhiko Ariga Mohammad Ali Abdelkareem Abdul Ghani Olabi Sustainable Energy&Power Systems Research Centre RISEUniversity of SharjahP.O.Box 27272SharjahUnited Arab Emirates International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukuba 305-0044Japan Department of Energy and Material Engineering Dongguk University-SeoulSeoul 04620Republic of Korea Graduate School of Frontier Sciences The University of Tokyo5-1-5 KashiwanohaKashiwaChiba 277-8561Japan Mechanical Engineering and Design School of Engineering and Applied ScienceAston UniversityAston TriangleBirmingham B47ETUK School of Computing Engineering and Physical SciencesUniversity of The West of ScotlandGlasgowPA12BEUK

The development of clean and sustainable energy sources has received widespread interest in the past few decades due to the rolling energy demands while extenuating the rising tiers of greenhouse gases and environmental *** to their intermittent nature,these green and sustainable sources require appropriate energy storage *** different energy storage technologies,electrochemical energy storage devices,particularly supercapacitors(SCs),have fascinated global attention for their utilization in electric vehicles,power supports,portable electronics,and many others application requiring electric energy devices for their ***,the growth of SCs in the commercial market has squeezed requirements,and further developments are obligatory for their effective *** the meantime,SCs also face technical complications and contests for their introduction in industrial settings because of their low energy density and high Levelized *** present study combines core strengths,weaknesses,opportunities,and threats(SWOT)analysis of SCs with new perspectives and recent *** challenges and the future progressive prospects of SCs are also presented in *** review will afford consistent direction and new superhighways for the further development of SCs as standalone and complementary energy storage systems.

关键词： Supercapacitors Energy storage Strengths Opportunities

Deformable Textile‑Structured Triboelectric Nanogenerator Knitted with Multifunctional Sensing Fibers for Biomechanical Energy Harvesting

在线全文

学校读者我要写书评

暂无评论

Advanced Fiber Materials 2022年第6期4卷 1486-1499页

作者： Li Dong Mingxu Wang Jiajia Wu Chunhong Zhu Jian Shi Hideaki Morikawa Graduate School of Medicine Science and TechnologyShinshu University3‑15‑1 TokidaUedaNagano 386‑8567Japan Institute for Fiber Engineering(IFES) Interdisciplinary Cluster for Cutting Edge Research(ICCER)Shinshu University3‑15‑1 TokidaUedaNagano 386‑8567Japan Faculty of Textile Science and Technology Shinshu University3‑15‑1 TokidaUedaNagano 386‑8567Japan Faculty of Systems Science and Technology Akita Prefectural University84‑4 Aza Ebinokuchi TsuchiyaYurihonjoAkita 015‑0055Japan

Fibers and textiles that harvest mechanical energy via the triboelectric effect are promising candidates as power supplies for wearable ***,triboelectric fibers and textiles are often hindered by problems such as complex fabrication processes,limited length,performances below the state-of-the-art of 2D planar configurations,***,we demonstrated a scalable fabrication of core-sheath-structured elastomer triboelectric fibers that combine silicone hollow tubes with ***-electrodes were fabricated via a facile freeze–thawing process of blending polyvinyl alcohol(PVA),gelatin,glycerin,poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)(PEDOT:PSS),and sodium chloride(NaCl).Such fibers can also be knitted into deformable triboelectric nanogenerator textiles with high electrical outputs up to 106 V and 0.8μA,which could work as reliable power supplies for small ***,we demonstrated fabric materials recognition,Morse code communication,and human-motion-recognition capabilities,making such triboelectric fiber platform an exciting avenue for multifunctional wearable systems and human–machine interaction.

关键词： Triboelectric fiber Deformable triboelectric nanogenerator textile Multifunctional sensing Wearable electronics

Removal of hexavalent chromium from water by Z-scheme photocatalysis using TiO_(2)(rutile)nanorods loaded with Au core-Cu_(2)0 shell particles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第5期34卷 173-189页

作者： Sayaka Yanagida Takumi Yajima Takahiro Takei Nobuhiro Kumada Center for Crystal Science and Technology University of YamanashiKofu 400-8511Japan Advanced Materials Development Sector Tokyo Metropolitan Industrial Technology Research Institute2-4-10AomiKoto-kuTokyo 135-0064Japan

All-solid-state Z-scheme photocatalysts,containing Cu_(2)O,TiO_(2)(rutile),and Au as the elec-tron mediator,were prepared and applied to the reduction of Cr(Ⅵ)in aqueous *** Cu_(2)O-Au-TiO_(2) composites were prepared by loading Au core-Cu_(2)O shell hemisphere particles on TiO_(2)(rutile)nanorods using a two-step photocatalytic deposition ***-der ultraviolet-visible(UV-vis)light illumination,the Cu_(2)O-Au-TiO_(2) composites exhibited higher photocatalytic Cr(Ⅵ)reduction activities than those exhibited by single TiO_(2)(rutile)and Cu_(2)*** this reaction,a precipitate containing Cr,which was considered to be Cr(OH)_(3),was deposited site-selectively on the Au core-Cu_(2)O shell particles of the composites,indi-cating that the reduction site of the composite was Cu_(2)O,and the reaction proceeded accord-ing to the *** Cu_(2)O-Au-TiO_(2) composites also exhibited photocatalytic activity under visible light *** oxidation state of Cu in the Cu_(2)O-Au-TiO_(2) composite gradually changed from Cu(Ⅰ)to Cu(Ⅱ)during the photocatalytic Cr(Ⅵ)*** the composite maintained its high photocatalytic performance even after *** role of Au in the Cu_(2)O-Au-TiO_(2) composite was examined by comparing the properties of the Cu_(2)O-Au-TiO_(2) composite with those of the Cu_(2)O-TiO_(2) composite prepared via direct Cu_(2)O deposition on TiO_(2).

关键词： Cu_(2)O TiO_(2)(rutile) Z-scheme Photocatalyst Chromium

Effects of tropical forest conversion into oil palm plantations on nitrous oxide emissions:A meta-analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2023年第3期34卷 865-869页

作者： Taiki Mori Kyushu Research Center Forestry and Forest Products Research InstituteFFPRIKurokami 4-11-16Kumamoto 860-0862Japan

Oil palm plantations have dramatically expanded in tropical Asia over the past *** their establishment has been projected to increase nitrous oxide(N_(2)O)emissions,earlier reports have shown inconsistent *** study analyzed these previously published data to compare N_(2)O emissions in oil palm plantations to reference forests.A linear mixed-eff ects model was used to examine the signifi cance of the eff ect of establishing oil palm plantations on N_(2)O emissions,rather than to calculate mean eff ect sizes because of limitations in the data *** results indicated that N_(2)O emissions were signifi cantly greater from oil palm plantations than from reference forests,as *** is the fi rst study to report the eff ect of oil palm plantations on N_(2)O emissions by synthesizing previously published *** quantify the size of this eff ect,additional studies with frequent and long-term monitoring data are needed.

关键词： Meta-analysis Nitrogen fertilization Nitrous oxide Oil palm plantation Tropical forest