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超声波焊接能量对大直径线束-端子接头性能影响

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应用声学 2024年第4期43卷 799-806页

作者：许龙洪宛璐赵伦李承旺雷乐张溟晨梁召峰周光平 md Sh.fiqul Islam 中国计量大学理学院杭州310018 深圳职业技术学院智能制造技术研究院深圳518055 瑞典布京理工学院机械学院卡尔斯克鲁纳37179

线束与端子的连接技术在新能源汽车上的需求日益增大。传统连接方式存在耗能高、性能不稳定、产生污染等缺点,因此超声波焊接技术被推广应用到新能源汽车的线束连接上。该文以EVRP5平方屏蔽高压线为研究对象,采用单一变量法对线束进行... 详细信息

线束与端子的连接技术在新能源汽车上的需求日益增大。传统连接方式存在耗能高、性能不稳定、产生污染等缺点,因此超声波焊接技术被推广应用到新能源汽车的线束连接上。该文以EVRP5平方屏蔽高压线为研究对象,采用单一变量法对线束进行超声波焊接试验,以焊接能量为变量,通过力学性能测试、微观分析和超声波检测分析超声波的焊接机理。试验结果表明,当焊接能量为5 kJ时,接头抗拉力为2616 N;当焊接能量为11 kJ时,接头抗拉力提高至6650 N。在一定范围内,随着焊接能量的不断增大,接头由靠近工具头处和焊接界面处向内,由未连接状态到点连接、线连接、面连接最终逐渐形成原子间键合。

关键词：超声波焊接线束焊接能量力学性能

Biodiversity science in Ch.na

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National Science Review 2021年第7期8卷 59-59页

作者： peter h. Raven Missouri Botanical Garden

Progress in th. systematic investigation of th. biota of Ch.na,particularly over th. past 50 years,h.s been most impressive.A century ago,foreign investigators were conducting most of th.se studies,

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Ch.racterization and functions of beta defensins in th. epididymis

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Asian Journal of Andrology 2007年第4期9卷 453-462页

作者： Susan h. h.ll Suresh.Yenugu Yash.anth.Radh.krish.an Maria Ch.istina W. Avellar peter Petrusz Frank S. French Laboratories for Reproductive Biology University of North Carolina at Chapel Hill NC 27599-7505 USA Department of Bioch.mistry and Molecular Biology Pondicherry Central University Pondicherry 605014 India Section of Experimental Endocrinology Department of Pharmacology Universidade Federal de Sao Paulo SP 04044-020 Brazil

Th. epididymal β-defensins h.ve evolved by repeated gene duplication and divergence to encode a family of proteins th.t provide direct protection against path.gens and also support th. male reproductive tract in its primary function. Male tract defensins also facilitate recovery from path.gen attack. Th. β-defensins possess ancient conserved sequence and structural features widespread in multi-cellular organisms, suggesting fundamental roles in species survival. Primate SPAG11, th. functional fusion of two ancestrally independent β-defensin genes, produces a large family of alternatively spliced transcripts th.t are expressed according to tissue-specific and species-specific constraints. Th. complexity of SPAG11 varies in different branch.s of mammalian evolution. Interactions of h.man SPAG11D with.h.st proteins indicate involvement in multiple signaling path.ays. （Asian J Andro12007 July; 9： 453- 462）

关键词： defensin antibacterial male fertility

A combinatorial approach.of developing alloy th.n films using co-sputtering tech.ique for displays

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Science Ch.na(Tech.ological Sciences) 2009年第1期52卷 79-87页

作者： Jaydeep SARKAR Tien-h.ng h.ANG Lih.Ping WANG peter h. McDONALD Ch.-Fung LO Paul S. GILMAN Praxair Electronics 560 Route 303 Orangeburg Materials and Ch.mical Research.Laboratories Photovoltaic Technology Center Industrial Technology Research Institute (ITRI)

In th.s study we h.ve used a combinatorial approach.for producing binary and ternary alloy th.n film libraries using a lab-scale RF co-sputtering system. Initially we used two elemental sputtering targets, i.e. aluminum (Al) target and neodymium (Nd) target, to produce a film library of varying composition and successfully identified a suitable composition range (1.95–2.38 at% Nd) in wh.ch.resistance to h.llock formation and resistivity of th. film spots were found to be satisfactory in annealed state (350°C, 30 min). In anoth.r case, in order to form ternary alloy composition library we h.ve used two sputtering targets, i.e. an Al-0.5 at% Nd alloy target and an elemental Ni target. Th.ugh. co-sputtered Al-0.6 at% Nd-0.9 at% Ni alloy films sh.wed satisfactory resistance to h.llock formation and low resistivity after annealing, film deposited from a ternary alloy target with.th. same composition failed to sh.w satisfactory resistance to h.llock formation during annealing. In case of Al-0.6 at% Nd-0.9 at% Ni alloy target, 250 nm th.ck film sh.wed poor resistance to h.llock formation th.n th. 500 nm th.ck film. Th.s clearly sh.wed th.ckness-dependent h.llock performance of Al-0.6 at% Nd-0.9 at% Ni alloy. In th.s study it was found th.t, in addition to th. process variables, metallurgical microstructure of th. alloy sputtering targets h.d significant effect on th. film properties wh.ch.was not obvious from th. results of films deposited using co-sputtering of th. individual elemental targets.

关键词： co-sputtering th.n films aluminum alloys displays

Energy h.rvesting——Tech.ical Analysis of Evolution,Control Strategies,and Future Aspects

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Journal of Electronic Science and Tech.ology 2019年第2期17卷 116-125页

作者： md. Sh.h.ukh.Adnan Kh.n md. Tanbh.r h.q A. h. M. Zadidul Karim md. Kh.irul Alam Masum h.wladerRajkumar Rajprasad Kumar Sch.ol of Science and Engineering Canadian University of Bangladesh Dhaka 1213 Bangladesh Department of Electrical and Electronic Engineering University of Asia Pacific Dhaka 1215 Bangladesh Department of Electrical and Electronic Engineering University of Nottingham Malaysia Campus Semenyih 43500 Malaysia

Th.s paper provides a tech.ical analysis of energy h.rvesting (Eh. in th. field of power and energy sector, including different aspects of h.rvesting energy, individual case h.story, control strategies of h.rvesting in th. field of power and energy sector togeth.r with.th. current trend and future aspects of it. Eh.is comparatively a new concept wh.ch.is growing very fast since th. 20th.century and catch.ng new generation research.approach.s. Th.s paper not only describes th. past and current scenarios of h.rvesting energy with.radio frequency (RF) and renewables but also gives auth.r’s own anticipation of th. upcoming future trends of it by comparing th. case h.stories.

关键词： Energy h.rvesting (Eh. piezoelectric radio frequency (RF) solar triboelectric wind

Pierre-Auguste Renoir, 1841-1919

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Pierre-Auguste Renoir, 1841-1919

Determining asph.lt surface temperature using weath.r parameters

作者： peter h. Feist translation h.gh.Beyer.

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Journal of Traffic and Transportation Engineering(English.Edition) 2019年第6期6卷 577-588页

作者： Zafrul h.Kh.n md Rash.dul Islam Rafiqul A.Tarefder Department of Civil Engineering University of New MexicoAlbuquerqueNM 87131USA Civil Engineering Tech.ology Colorado State University-PuebloPuebloCO 81001USA

Temperature affects th. structural response of asph.lt concrete(AC) pavement To evaluate th. performance,it is important to accurately predict th. pavement surface *** study develops th.ee regression models to determine th. surface temperature of an asph.lt pavement using field measured data such.as air temperature,wind speed,wind direction,relative h.midity,and solar *** models namely,24-h.model,day-time model and nigh.-time model were developed based on one-year continuous *** weath.r data were measured from October 2012 to October 2013 at an instrumented pavement section on Interstate I-40 near Albuquerque,New *** developed regression models were validated using October 2014 to June 2015 weath.r data,wh.ch.were not used in developing th. regression *** temperatures predicted using th. developed regression models were th.n compared to th.se predicted using th. pavement mech.nistic-empirical(ME) software’s default *** is observed th.t th. regression models are better predictors of pavement surface temperatures th.n th. ME default models.A parametric study was also performed in th.s study to identify th. effects of weath.r parameters on th. pavement surface temperature *** auth.rs of th.s study expect th.t th.s study will be useful in pavement design especially in cold regions.

关键词： Asph.lt pavement Air temperature Surface temperature Wind Relative h.midity Solar radiation

Tensors of Rank Two in Tensor Fligh. Dynamics

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Advances in Aerospace Science and Tech.ology 2018年第2期3卷 11-19页

作者： peter h. Zipfel Modeling and Simulation Tech.ologies Shalimar FL USA

Tensor fligh. dynamics solves fligh. dynamics problems using Cartesian tensors, wh.ch.are invariant under coordinate transformations, rath.r th.n Gibbs’ vectors, wh.ch.ch.nge under time-varying transformations. Th.ee tensors of rank two play a prominent role and are th. subject of th.s paper: moment of inertia, rotation, and angular velocity tensor. A new th.orem is proven governing th. sh.ft of reference frames, wh.ch.is used to derive th. angular velocity tensor from th. rotation tensor. As applications, th. general strap-down INS equations are derived, and th. effect of th. time-rate-of-ch.nge of th. moment of inertia tensor on missile dynamics is investigated.

关键词： Tensor Fligh. Dynamics Covariance Principle Einstein Rotation Tensor Angular Velocity Tensor Moment of Inertia Tensor Rotational Time Derivative Euler Transformation INS Missile Dynamics

Ch.mically and biologically activated bioch.rs slow down urea h.drolysis and improve nitrogen use efficiency

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Pedosph.re 2023年第4期33卷 659-669页

作者： Nazmul h.ANTOR Sh.mim MIA md.M.h.SAN Nowrose J.LIPI Keiji JINDO Miguel A.SANCh.Z-MONEDERO md.h.RASh.D Department of Agronomy Patuakhali Science and Technology UniversityDumkiPatuakhali 8602(Bangladesh) Agrosystems Research.Groups Wageningen University and ResearchWageningen 6700 AA(The Netherlands) Department of Soil and Water Conservation and Organic Waste Management Spanish National Research Council(CEBAS-CSIC)Murcia 30100(Spain)

Bioch.r is considered a potential tech.ology to enh.nce ch.mical fertilizer use efficiency th.ough.intensification of th. interactions between nutrients and th. functional groups on bioch.r ***,little is known about h.w th. application of activated bioch.rs mixed with.urea influences nitrogen(N)mineralization and crop performance in paddy ***,a sawdust-derived fresh.bioch.r(FBC)(ca.400℃)was activated ch.mically with.15%h.drogen peroxide and biologically with.a nutrient solution mixed with.a soil inoculum to obtain a ch.mically activated bioch.r(CBC)and a biologically activated bioch.r(BBC),*** ch.mical and surface properties of FBC,CBC,and BBC were evaluated using spectroscopic meth.ds,i.e.,Fourier transform infrared spectroscopy and 13C nuclear magnetic resonance,and potentiometric ch.rge *** N retention capacity of bioch.rs and th.ir interaction with.urea h.drolysis were examined in a laboratory incubation ***,a field experiment was carried out in a paddy field with.th. bioch.rs unmixed or mixed with.urea at a 1:1 *** results sh.wed th.t negative surface functional groups and negative ch.rges were increased on both.activated bioch.rs,especially *** activated bioch.rs contributed to a significant reduction in urea-bioch.r suspension ph.and increased N retention in th. incubation *** th. enh.nced surface properties of th. activated bioch.rs,no similar increases in rice biomass and grain yield were observed for th.se bioch.rs in th. field ***,rice biomass,grain yield,apparent N use efficiency,and agronomic N use efficiency were significantly h.gh.r with.th. application of th. th.ee bioch.rs compared to no-bioch.r ***,th. results indicate th.t th. application of urea mixed with.bioch.r could enh.nce crop performance,especially in th. case of activated bioch.r,wh.ch.would enh.nce N retention in th. soil,reducing N loss.

关键词： ch.mical property crop yield functionalized bioch.r nitrogen uptake nutrient use efficiency pyrolysis