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高电压技术 2011年第11期37卷 2739-2745页

作者： Rudi Kurnianto Z.Nawawi H.Ahmad N.Hozumi m.nagao Department of Electrical Engineering Tanjungpura UniversityPontianak-78124Indonesia Faculty of Engineering University Teknologi MalaysiaMalaysia Department of Electrical & Electronic Engineering Aichi Institute of TechnologyJapan Department of Electrical & Electronic Engineering Toyohashi University of TechnologyJapan

This paper deals with a digest on electrical treeing degradation in nanocomposite of magnesium oxide(mgO) added to a low-density polyethylene(LDPE).The objective is to elucidate the"visual"aspects of runaway stage of final treeing breakdown mechanisms,and to ensure that the existence of mgO filler itself is responsible for this aspect instead of voltage application ***"visual"aspect of treeing breakdown was investigated by applying ac ramp voltage with continuous rising speed of 0.5 kV/*** soon as tree had been incepted,the voltage was kept constant to observe the tree propagation until *** tree propagations were also described by their fractal dimension. To ensure the responsibility of mgO filler on the"visual"aspect results,the experiment was repeated using the same rate of ac ramp ***,as soon as tree had been incepted,the voltage was either increased or decreased to a constant value of mean tree inception voltage obtained from the preceding results to observe its propagation to breakdown. As a result,the tree inception voltage was increased with the filler concentration in *** filler is considered not only acted as a physical obstacle for tree to propagate,but also as a chemical obstacle in which the free electron might be trapped to cause difficulties for electron avalanche *** consideration could also be valid for tree propagation up to *** propagation,due to the filler,the tree structure is accompanied by more *** the branches are closely placed each other,the tree tips become relatively uniform field compares to pure *** would produce the higher local breakdown strength at the tree tips,leads to the suppression of ***"visual"aspect of breakdown could be achieved by applying voltage exactly at the inception level. After bridging the tree would not breakdown until a short period of time *** this period,the tree channel will be eroded by internal flashover(IFO) and b

关键词： nano-filler mgO LDPE tree degradation breakdown visual aspect

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国际医学放射学杂志 2020年第5期 626-627页

作者： K.Ando m.nagao E.Watanabe A.Sakai A.Suzuki R.Nakao 王辉 Department of Radiology Guangdong Provincial People’s Hospital Guangdong Academy of Medical Sciences

摘要目的应用血氧水平依赖性(BOLD) T~*心脏磁共振成像(T~*-CmR)和Tmapping来评估肥厚性心肌病(HCm)病人的心肌氧合与心肌纤维化之间是否存在相关性。

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聚丙烯薄膜在高温区的电击穿

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电力电容器与无功补偿 1986年第1期 80-83页

作者： m.nagao m.Fukuma N.Ohsachi m.Kosaki m.Ieda 宋明兰丰桥工业大学日本名古屋大学

研究了聚丙烯薄膜在高温区施加直流电压击穿。在室温以上,环氧树脂模注样品的电击穿,热过程起着支配作用。对非模注样品,电气机械变形过程也起着重要作用,这种作用由在施加电压的情况下样品表面反射的激光图样的变化得到证实。

关键词：予应力极性聚丙烯薄膜环氧树脂万能胶环氧化物聚丙烯膜电气强度击穿强度绝缘性能电击穿放电高温区

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Operationally Simple Enantioselective Silane Reduction of Ketones by the [Ir(Ome)(cod)]₂/Azolium Catalytic System

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International Journal of Organic Chemistry 2024年第1期14卷 1-19页

作者： Satoshi Sakaguchi Chika nagao Ryo Ichihara Shogo matsuo Department of Chemistry and materials Engineering Faculty of Chemistry Materials and Bioengineering Kansai University Suita Japan

An operationally simple protocol was designed for the enantioselective silane reduction (ESR) of ketones using air- and moisture-stable [Ir(Ome)(cod)]2 (cod = 1,5-cyclooctadiene) (3) as a metal catalyst precursor. This reaction was driven by chiral hydroxyamide-functionalized azolium salt 2. The catalytic ESR reaction could be performed under benchtop conditions at room temperature. Treatment of 2 with 3 in THF yielded the monodentate IrCl(NHC)(cod) (NHC = N-heterocyclic carbene) complex 4 in 93% yield, herein the anionic methoxy ligand of 3 serves as an internal base that deprotonates the azolium ring of 2. The well-defined Ir complex 4 catalyzed the ESR reaction of propiophenone (6) with (EtO)2meSiH using the pre-mixing reaction procedure. Based on this success, the catalytic ESR reaction was designed and implemented using an in situ-generated NHC/Ir catalyst derived from 2 and 3. Thus, a wide variety of aryl ketones could be reduced to the corresponding optically active alcohols in moderate to excellent stereoselectivities at room temperature without temperature control. Since the high catalytic activity of 3 was observed, we next evaluated several other transition metal catalyst precursors for the catalytic ESR reaction under the influence of 2. This evaluation revealed that Ir(acac)(cod) (acac = acetylacetonate) (28) and [IrCl(cod)]2 (5) can be successfully used as metal catalyst precursors in the ESR reaction.

关键词： Asymmetric Catalysis Enantioselective Reduction Hydrosilylation Reaction N-Heterocyclic Carbene Iridium

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运用心脏mR成像计算左心室偏心率评估先天性心脏病的右心室血流动力学和心肌纤维化的临床意义

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国际医学放射学杂志 2016年第6期 711-712页

作者： Y.Yamasaki m.nagao T.Kamitani T.Yamanouchi S.Kawanami K.Yamamura 华明辉 Department of Clinical Radiology Graduate School of Medical SciencesKyushu University

摘要目的使用心脏mR电影序列计算偏心率(EI)评估先天性心脏病(CHD)的右心室(RV)血流动力学状态。方法 55例CHD病人[女32例,平均年龄(40.7±20.9)岁]均

关键词：血流动力 EI RV 偏心率心脏心脏先天畸形先天性心脏病 mR

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Influences of Horticultural Therapy and Functional Recovery Training at a Day-Care Center for the Elderly and Text mining of Care Records by AI

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Open Journal of Therapy and Rehabilitation 2024年第2期12卷 117-131页

作者： Seigo Koura Shinya matsutani Kazuho nagao Yu Fukushima Akiko Ikeda Takeshi Oshikawa Tomohiro Inagaki Kentaro Higashi Faculty of Graduate School Postdoctoral Course in Health Care medicine Nishikyusyu University Kanzaki Japan Social Welfare Corporation Kanjikai Miyakonojyo Japan Sophia Phyto-Therapy College Tokyo Japan

Background: In Japan, due to the COVID-19 pandemic, various behavioral restrictions were implemented from march 2020, resulting in an increased number of elderly people with reduced participation in care and rehabilitation. As a result, the decline in motor and cognitive functions became more pronounced. Purpose: The study examined how activities combining passive horticultural therapy, which is always introduced, with active functional recovery training, which is used in the functional recovery training of patients with hemiplegia, influence the behavior of elder people using the facility. methods: 36 elder people with care need 1 or 2 who regularly used the day-care facilities after the pandemic ended and who agreed to participate in the study was included. The assessment data were every three months from December 2021 to December 2023 after the COVID-19 pandemic, the mmSE and moca-J, TmIG-Index, and GDS15. AI-based text mining was used to compare changes in visit reports before and after the introduction of the Posture Chart and Red Code, and the relationship between the language used. Results: The results of mmSE and moca-J were both significantly higher in Group B and C than in Group A. TImG assessment, was significantly higher in Group B and C than in Group A, and Group C was significantly higher than Group B. The GDS, an assessment of depression in old age, tended to be significantly higher in Group A than in Groups B and C. In the “Co-Occurrence Network Analysis” shown after the introduction of the latest functional recovery training equipment such as the Red Cord, its results showed a high association between the words Bathing and CARE and words such as POSTURE, Red-Code, and AI, App, which are used in functional training and rehabilitation, and their analysis. Conclusion: At day-care facilities specializing in functional recovery training and rehabilitation, a combination of horticultural therapy and the latest functional training equipment found to help m

关键词： Horticultural Therapy Hand Care Treatment Senior Day-Care Center Functional Recovery Training KH-Corder

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Frequency-dependent viscoelasticity effects on the wave attenuation performance of multi-layered periodic foundations

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 407-424页

作者： m.SAFI m.VAKILIFARD m.J.mAHmOODI Faculty of Civil Water&Environmental EngineeringShahid Beheshti UniversityTehran ***Iran Faculty of mechanical and Energy Engineering Shahid Beheshti UniversityTehran ***Iran

In this paper,layered periodic foundations(LPFs)are numerically examined for their responses to longitudinal and transverse modes in the time and frequency *** different unit-cells,i.e.,2-layer,4-layer,and 6-layer unit-cells,comprising concrete/rubber,concrete/rubber/steel/rubber,and concrete/rubber/steel/rubber/lead/rubber materials,respectively,are taken into ***,the viscoelasticity behavior of the rubber is modeled with two factors,i.e.,a frequency-independent(FI)loss factor and a linear frequency-dependent(FD)loss *** the extraction of the complex dispersion curves and the identification of the band gaps(BGs),the simulations of wave transmission in the time and frequency domains are performed using the COmSOL *** parametric studies evaluate the effects of the rubber viscoelasticity models on the dispersion curves and the wave transmission for the longitudinal and transverse *** results show that considering the rubber viscoelasticity enhances the wave attenuation ***,the transverse-mode damping is more sensitive to the viscoelasticity model than its longitudinal *** 6-layer unit-cell LPF exhibits the lowest BG,ranging from 4.8 Hz to 6.5 Hz.

关键词： layered metamaterial periodic foundation complex dispersion curve wave transmission diagram

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Engineering of efficient visible light photocatalysts:Ti_(1-x+y)Cu_(x)La_(y)O_(2)(x=0.03;y=0,0.005,0.01) compositions

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Journal of Rare Earths 2024年第3期42卷 497-505,I0003页

作者： S.m.Yakout A.m.Youssef Inorganic Chemistry Department National Research Centre(NRC)El Buhouth StDokkiCairo12622Egypt

In dye-photocatalysis, widening the wavelengths absorption range of catalysts as well as aborting the recombination of the photoexcited charge carriers(electrons-holes pairs) are of paramount *** the current study, we report the photocatalytic characteristics of four compositions composed of TiO_(2),Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders for two harmful dyes(Congo red and methylene blue). The X-ray diffraction technique verified the configuration of mixed anatase and rutile phases in pure TiO_(2)and Ti_(0.97)Cu_(0.03)O_(2)powders while Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders possess anatase phase only. The changes of the band gap structure and dimensions of the unit cell volume of TiO_(2)confirm the substitution of Ti^(4+)sites by Cu^(2+)and La^(3+)ions. Remarkable widening of wavelengths absorption with formation of long absorption tails were found in TiO_(2)(3.13 e V) through insertion of La^(3+)plus Cu^(2+)ions. Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)samples exhibit a visible light band gap of 2.3 and 2.7 e V, respectively. Based on SEm images, incorporation of Cu^(2+)and La^(3+)ions influences the surface morphology of TiO_(2). The resulting Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders present enhanced photocatalytic activity towards Congo red dye degradation compared to pure one under natural solar spectrum. The best Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst exhibits superior photocatalytic activity of 96% for 10 ppm CR dye in 20 min as well as above average photocatalytic efficiency of 63% for 30 ppm CR dye in 120 min. As well, it showed acceptable photodegradation activity of 52% for 30 ppm mB solution in 140 min of sunlight irradiation. The heightened photodegradation efficiency of Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst can be clarified in terms of higher ch

关键词： Semiconductor TiO_(2) Rare earths Congo red methylene blue Solar spectrum Photodegradation

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Nonlinear dynamic modeling of planar moving Timoshenko beam considering non-rigid non-elastic axial effects

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 479-496页

作者： m.ABBASI GAVARI m.R.HOmAEINEZHAD Faculty of mechanical Engineering K.N.Toosi University of TechnologyTehran 19991-43344Iran

Due to the importance of vibration effects on the functional accuracy of mechanical systems,this research aims to develop a precise model of a nonlinearly vibrating single-link mobile flexible *** manipulator consists of an elastic arm,a rotary motor,and a rigid carrier,and undergoes general in-plane rigid body motion along with elastic transverse *** accurately model the elastic behavior,Timoshenko’s beam theory is used to describe the flexible arm,which accounts for rotary inertia and shear deformation *** applying Newton’s second law,the nonlinear governing equations of motion for the manipulator are derived as a coupled system of ordinary differential equations(ODEs)and partial differential equations(PDEs).Then,the assumed mode method(Amm)is used to solve this nonlinear system of governing equations with appropriate shape *** assumed modes can be obtained after solving the characteristic equation of a Timoshenko beam with clamped boundary conditions at one end and an attached mass/inertia at the *** addition,the effect of the transverse vibration of the inextensible arm on its axial behavior is *** the axial rigidity,the effect makes the rigid body dynamics invalid for the axial behavior of the ***,numerical simulations are conducted to evaluate the performance of the developed model,and the results are compared with those obtained by the finite element *** comparison confirms the validity of the proposed dynamic model for the *** to the mentioned features,this model can be reliable for investigating the system’s vibrational behavior and implementing vibration control algorithms.

关键词： planar moving Timoshenko beam non-rigid non-elastic axial effect as-sumed mode method(Amm) nonlinear motion analysis

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Free vibration and buckling analysis of polymeric composite beams reinforced by functionally graded bamboo fbers

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 543-562页

作者： H.m.FEIZABAD m.H.YAS Department of mechanical Engineering Razi UniversityKermanshah ***Iran

Natural fibers have been extensively researched as reinforcement materials in polymers on account of their environmental and economic advantages in comparison with synthetic fibers in the recent *** fibers are renowned for their good mechanical properties,abundance,and short cycle *** beams are one of the fundamental structural components and are susceptible to mechanical loads in engineering applications,this paper performs a study on the free vibration and buckling responses of bamboo fiber reinforced composite(BFRC)beams on the elastic *** different functionally graded(FG)layouts and a uniform one are the considered distributions for unidirectional long bamboo fibers across the *** elastic properties of the composite are determined with the law of *** Hamilton’s principle,the governing equations of motion are *** generalized differential quadrature method(GDQm)is then applied to the equations to obtain the *** achieved outcomes exhibit that the natural frequency and buckling load values vary as the fiber volume fractions and distributions,elastic foundation stiffness values,and boundary conditions(BCs)and slenderness ratio of the beam ***,a comparative study is conducted between the derived analysis outcomes for BFRC and homogenous polymer beams to examine the effectiveness of bamboo fibers as reinforcement materials,demonstrating the significant enhancements in both vibration and buckling responses,with the exception of natural frequencies for cantilever beams on the Pasternak foundation with the FG-◇fiber ***,the obtained analysis results of BFRC beams are also compared with those for carbon nanotube reinforced composite(CNTRC)beams found in the literature,indicating that the buckling loads and natural frequencies of BFRC beams are lower than those of CNTRC beams.

关键词： bamboo fiber free vibration buckling analysis functionally graded(FG)beam elastic foundation generalized differential quadrature method(GDQm)

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