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汽车与新动力 2014年第3期46卷 7-15页

作者： Y.Motohashi K.Kubota N.Akaishi K.Ishiki t.iwamoto M.Kinoshita 陈荣峻

全新开发的2.4 L带智能可变气门正时及升程电控系统的4缸直喷汽油机是本田公司下一代机型,应用了带多孔高压喷油器的直喷系统,实现了低二氧化碳排放和高功率输出。对气缸盖进气道和燃烧室形状、喷油器喷雾形状,以及燃油喷射控制都进行... 详细信息

全新开发的2.4 L带智能可变气门正时及升程电控系统的4缸直喷汽油机是本田公司下一代机型,应用了带多孔高压喷油器的直喷系统,实现了低二氧化碳排放和高功率输出。对气缸盖进气道和燃烧室形状、喷油器喷雾形状,以及燃油喷射控制都进行了优化,以确保形成均质混合气,实现稳定、高效的燃烧。全新的发动机结构使摩擦也得到降低。新型发动机的功率和扭矩都增加10%,燃油耗则降低5%。配装新发动机的2013年型Accord轿车配合高效率无级变速器,以及改进后的底盘,使组合行驶工况燃油耗降低11%,并达到美国加州空气资源委员会排放法规中准零排放车级别的排放要求。此外,新结构的发动机减轻了质量,并通过优化气缸体刚度,使噪声-振动-平顺性性能优于旧机型。

关键词：车用汽油机缸内直喷燃烧系统动力性能燃油经济性废气排放

日本结核分枝杆菌北京家族株的系统发生学与基因学特征

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国际结核病与肺部疾病杂志 2011年第2期6卷 91-94页

作者： S.Maeda t.Wada t.iwamoto Y.Murase S.Mitarai I.Sugawara S.Kato 姜广路刘宇红 the Research Institute of tuberculosis Japan Anti-Tuberculosis Association Department of Microbiology Osaka City Institute of Public Health and Environmental Sciences partment of Microbiology Kobe Institute of Health

为评价目前在日本流行的结核分枝杆菌的基因结构特征,对从全日本结核病患者中分离到的237株北京家族株进行了系统发生学的研究。与之前来自于其他国家的报道不同,古老亚型菌株是日本的主要流行株。成簇分析建立在JAtA-VNtR(日本防痨协... 详细信息

为评价目前在日本流行的结核分枝杆菌的基因结构特征,对从全日本结核病患者中分离到的237株北京家族株进行了系统发生学的研究。与之前来自于其他国家的报道不同,古老亚型菌株是日本的主要流行株。成簇分析建立在JAtA-VNtR(日本防痨协会随机重复序列的可变数目)的基础上,这种方法可以描述日本结核分枝杆菌菌株的独特的VNtR方法,结果揭示了现代亚型菌株间没有地域来源的区别,具有高度的相似性。JAtA-VNtR方法可能对在经常分离出古老亚型菌株的菌群中进行系统发生学研究是有价值的。

关键词：结核分支杆菌北京家族株 VNtR 系统发生学

A Review of Contact Electrification at Diversified Interfaces and Related Applications on triboelectric Nanogenerator

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Nano-Micro Letters 2024年第1期16卷 106-130页

作者： Jun Hu Mitsumasa iwamoto Xiangyu Chen CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083People’s Republic of China School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Department of Physical Electronics Tokyo Institute of Technology2‑12‑1 S3‑33 O‑OkayamaMeguro‑KuTokyo 152‑8552Japan

the triboelectric nanogenerator(tENG)can effectively collect energy based on contact electrification(CE)at diverse interfaces,including solid–solid,liquid–solid,liquid–liquid,gas–solid,and gas–*** enables energy harvesting from sources such as water,wind,and *** this review,we provide an overview of the coexistence of electron and ion transfer in the CE *** elucidate the diverse dominant mechanisms observed at different interfaces and emphasize the interconnectedness and complementary nature of interface *** review also offers a comprehensive summary of the factors influencing charge transfer and the advancements in interfacial modification ***,we highlight the wide range of applications stemming from the distinctive characteristics of charge transfer at various ***,this review elucidates the future opportunities and challenges that interface CE may *** anticipate that this review can offer valuable insights for future research on interface CE and facilitate the continued development and industrialization of tENG.

关键词： Contact electrification Interfaces triboelectric nanogenerators Diversified applications

Optical second-harmonic generation measurement for probing organic device operation

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Light(Science & Applications) 2015年第1期4卷 99-108页

作者： takaaki Manaka Mitsumasa iwamoto Department of Physical Electronics Tokyo Institute of Technology2-12-1 O-okayamaMeguro-kuTokyo 152-8552Japan

We give a brief overview of the electric-field induced optical second-harmonic generation(EFISHG)technique that has been used to study the complex behaviors of organic-based *** analyzing EFISHG images of organic field-effect transistors,the in-plane two-dimensional distribution of the electric field in the channel can be *** susceptibility tensor of the organic semiconductor layer and the polarization of the incident light are considered to determine the electric field *** imaging can effectively evaluate the distribution of the vectorial electric field in organic films by selecting a light *** the time-resolved technique,measurement of the electric field originating from the injected carriers allows direct probing of the carrier motion under device operation,because the transient change of the electric field distribution reflects the carrier *** applications of the EFISHG technique to organic electronic devices are reviewed.

关键词： electric field optical second-harmonic generation semiconductor device

Computationally Efficient Large-Eddy Simulation of Periodic Unsteady Flow using Harmonic Balance Method

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Journal of thermal Science 2022年第1期31卷 62-71页

作者： YUMA iwamoto SUSUMU teramoto KOJI Okamoto Department of Aeronautics and Astronautics University of TokyoTokyo 113-8656Japan Department of Advanced Energy University of TokyoTokyo 113-8656Japan

to improve the efficiency and fidelity of the numerical analysis for cascade flutter, we propose an efficient scale-resolving simulation method dedicated to time-periodic flows by incorporating the harmonic balance approach into the large-eddy simulation. this method combined convergence calculations of the steady-state problem based on the harmonic balance method for periodic components, and the nonlinear time-marching method for turbulent fluctuations. Using the proposed method, deterministic periodic components and stochastic turbulent fluctuations were calculated simultaneously, and the effect of turbulent fluctuations on deterministic periodic components was directly calculated without using turbulence models. In this paper, we explain the algorithm and feature of this simulation technique and present the results of the computation for channel flow excited in the streamwise direction as an analysis example using the proposed method. In order to validate the proposed method, an analysis of sinusoidally pulsating channel flow at the central friction-velocity Reynolds numbers Rer = 180 was conducted, confirming that the amplitude and phase of the mean velocity oscillation computed by the proposed method were in good agreement with those of the conventional LES. the present calculation achieved an order of magnitude improvement in computational efficiency compared to conventional LES.

关键词： harmonic balance LES turbulent channel flow

Epigenetic memory of drug exposure history controls neural stem cell quiescence in the adult brain

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Neural Regeneration Research 2024年第4期19卷 711-712页

作者： Masakazu iwamoto taito Matsuda Department of Stem Cell Biology and Medicine Graduate School of Medical SciencesKyushu UniversityFukuokaJapan

Neural stem cells(NSCs)are the source of all neurons and glial cells(astrocytes and oligodendrocytes)in the central nervous *** adult mammalian brain retains NSCs in the subgranular zone of the dentate gyrus in the hippocampus and ventricular subventricular zone lining the lateral ventricle(Olpe and Jessberger,2022).Adult NSCs in rodents are preserved throughout life and continuously produce new neurons that integrate into the pre-existing neuronal network.

关键词： neural integrate continuously

Effect of impact deformation on shape recovery behavior in Fe-Mn-Si shape memory alloy under shape memory training process with cyclic thermo-mechanical loading

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Science China(technological Sciences) 2021年第7期64卷 1389-1400页

作者： SUN Qian CAO Bo iwamoto takeshi SUO tao Graduate School of Engineering Hiroshima UniversityHigashi-Hiroshima739-8527Japan Cluster of Excellence livMatS@FIt-Freiburg Center for Interactive Materials and Bioinspired technologies University of FreiburgFreiburgD-79110Germany Academy of Science and technology Hiroshima UniversityHigashi-Hiroshima739-8527Japan School of Aeronautics Northwestern Polytechnical UniversityXi’an710072China

In the past studies, it has been discovered that the shape memory effect(SME) in the Fe-Mn-Si shape memory alloy(Fe-SMA)can gradually be enhanced by a pre-process called as shape memory training process under cyclic thermo-mechanical *** the other hand, it has been shown that the SME of Fe-SMA can also be affected by changing the strain rate. therefore, it is possible to improve the SME by combining the strain rate sensitivity and shape memory training process. However, the improvement of SME caused by the training process under impact condition is still unclear. For the training process under impact condition, it is difficult to interrupt the test at the desired strain level due to many reflections of stress waves, which reload the specimen from the free ends. In this paper, to obtain reliable experimental results of SME after the training process under impact condition, the stress waves after first loading are eliminated by the double momentum-trap structure introduced into the impact tensile testing apparatus based on the split Hopkinson pressure bar method. In order to achieve an optimum design of the structure used in experiments, the finite element simulation of the structure is performed. then, tensile tests in the training process of Fe-28Mn-6Si-5Cr alloy at different strain rates including the impact level are conducted and temperature change of the specimen is measured during training and heating process. As a result, the improvement of SME in the alloy after the training process under quasi-static and impact loading is compared with that under quasi-static loading through verification processes.

关键词： Fe-Mn-Si shape memory alloy training cyclic thermo-mechanical process split Hopkinson pressure bar momentumtrap impact deformation

transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 177-192页

作者： M.NAVEED M.IMRAN t.ASGHAR Z.ABBAS Department of Mathematics Division of Science and TechnologyUniversity of Education Department of Mathematics The Islamia University of Bahawalpur

this paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. the influence of magnetic fields is also inspected in terms of their physical characteristics. to depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDEs)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAM).the effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective Lewis number.

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Study of Forced Convection Heat transfer of Supercritical CO_(2) in a Horizontal Channel by Lattice Boltzmann Method

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Advances in Applied Mathematics and Mechanics 2010年第5期2卷 564-572页

作者： Xiaodong Niu Hiroshi Yamaguchi Yuhiro iwamoto Xinrong Zhang Mingjun Li Yuhiro iwamoto Department of Mechanical Engineering Doshisha UniversityKyo-Tanabe-ShiKyoto 610-0321Japan Department of Energy and Resources Engineering College of EngineeringPeking UniversityBeijing 100871P.R.China Department of Mechanical Engineering Xiangtan UniversityHunan 411105P.R.China

the problem of forced convection heat transfer of supercritical CO_(2) in a horizontal channel is investigated numerically by a lattice Boltzmann *** study is stimulated by our recent experimental findings on solar collectors using supercritical CO_(2) as a working fluid,which can achieve the collector efficiency high up to 70%.to deeply understand the heat transfer characteristics of supercritical CO_(2) and provide a theoretical guidance for improving our current experimental system,in present study several typical experimental flow conditions are *** particular,the work focuses on the convective heat transfer characteristics of supercritical CO_(2) flowing in a horizontal channel with mediate Reynolds numbers ranging from 210 to 840 and constant heat fluxes from 400.0 to 800.0 W/m^(2).the simulations show that the heat transfer increases with heat flux and decreases with Reynolds ***,the mechanisms of heat transfer enhancement of supercritical CO_(2) fluid are identified.

关键词： Forced convection supercritical CO_(2) lattice Boltzmann method