检索结果-南通市图书馆

Coaxial Wet Spinning of Boron Nitride Nanosheet‑Based Com.osite Fibers with Enhanced Therm.l Conductivity and m.chanical Strength

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-m.cro Letters 2024年第2期16卷 126-138页

作者： Wenjiang Lu Qixuan Deng m.nsu Liu Baofu ding Zhiyuan Xiong Ling Qiu Tsinghua Shenzhen International Graduate School(TSIGS) Tsinghua UniversityShenzhen 518055People’s Republic of China m.nash Suzhou Research Institute(m.RI) Monash UniversitySuzhou 215000People’s Republic of China Faculty of m.terials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Shenzhen Key Laboratory of Energy m.terials for Carbon Neutrality Shenzhen 518055People’s Republic of China School of Light Industry and Engineering South China University of TechnologyGuangzhou 510614People’s Republic of China

Hexagonal boron nitride nanosheets(BNNSs)exhibit rem.rkable therm.l and dielectric ***,their self-assem.ly and alignm.nt in m.croscopic form. rem.in challenging due to the chem.cal inertness of boron nitride,thereby lim.ting their perform.nce in applications such as therm.l *** this study,we present a coaxial wet spinning approach for the fabrication of BNNSs/polym.r com.osite fibers with high nanosheet *** com.osite fibers were prepared using a superacid-based solvent system.and showed a layered structure com.rising an aram.d core and an aram.d/BNNSs ***,the coaxial fibers exhibited significantly higher BNNSs alignm.nt com.ared to uniaxial aram.d/BNNSs fibers,prim.rily due to the additional com.ressive forces exerted at the core-sheath interface during the hot drawing *** a BNNSs loading of 60 wt%,the resulting coaxial fibers showed exceptional properties,including an ultrahigh Herm.n orientation param.ter of 0.81,therm.l conductivity of 17.2 W m.(-1)K^(-1),and tensile strength of 192.5 *** results surpassed those of uniaxial fibers and previously reported BNNSs com.osite fibers,m.king them.highly suitable for applications such as wearable therm.l m.nagem.nt *** findings present a prom.sing strategy for fabricating high-perform.nce com.osite fibers based on BNNSs.

关键词： Boron nitride nanosheets Coaxial fiber Interfacial com.ression Nanosheet aligning Wearable therm.l m.nagem.nt

Experim.ntal research on the m.croclim.te in the naturally ventilated m.lti-span greenhouse

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2024年第3期17卷 68-74页

作者： Zhenjun Gao Wenyang Li Wei Li Xiaom.ng ding College of m.chanical and Power Engineering China Three Gorges UniversityYichang 443002HubeiChina Guangdong m.dern Agricultural Equipm.nt Research Institute Guangzhou 510630China Key Laboratory of Agricultural Facilities Structural Engineering Academy of Agricultural Planning and EngineeringMinistry of Agriculture and Rural AffairsBeijing 100125China

In order to further understand the changing laws of environm.ntal factors in large m.lti-span greenhouses under natural ventilation conditions and the internal relations between various environm.ntal factors,and ultim.tely im.rove the precision of m.croclim.te regulation of large m.lti-span *** the m.lti-span greenhouse with a sm.ll spire structure in the Dem.nstration Base of Guangdong Agricultural Technology Extension Station as the research object,under the condition of natural ventilation with butterfly-shaped windows,the changes in tem.erature,hum.dity,wind speed and solar light intensity of different m.nitoring planes in the greenhouse were *** analyzing the m.nitoring data,it was found that:1)The tem.erature gradient in the vertical direction in the large m.lti-span greenhouse is m.re obvious than that in the sm.ll greenhouse,and the highest average tem.erature difference m.nitored can reach 7.9℃.The velocity field in the m.ltispan greenhouse is always m.intained within the range of 0.3-0.4 m.s,and the am.ient wind speed has no effect on the airflow speed in the *** hum.dity and speed in the m.lti-span greenhouse show good uniform.ty.2)In a large m.lti-span greenhouse,the secondary radiation generated by the internal shading has less im.act on the area near the ground,which can effectively reduce the ground tem.erature.3)Under the conditions studied in this research,the tem.erature and hum.dity in the greenhouse follow the external environm.nt as well,showing that the greenhouse design is reasonable,and the air renewal and heat exchange inside and outside the greenhouse are good during natural ventilation.

关键词： natural ventilation m.lti-span greenhouse environm.ntal factors m.croclim.te

m.cosal im.une responses to Ichthyophthirius m.ltifiliis in the ocular m.cosa of rainbow trout(Oncorhynchus m.kiss,Walbaum.,an ancient teleost fish

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

m.rine Life Science & Technology 2024年第2期6卷 266-279页

作者： Weiguang Kong Guangyi ding Gaofeng Cheng Peng Yang Zhen Xu Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China Departm.nt of Aquatic Anim.l m.dicine College of FisheriesHuazhong Agricultural UniversityWuhan 430070China

The eye,as a specialized visual organ,is directly exposed to the external environm.nt,and,therefore,it faces constant chal-lenges from.external pathogenic organism. and *** the ocular m.cosa(Om.of m.m.als,m.cosal-associated lym.hoid tissues(m.LTs)constitute the prim.ry line of ***,the im.une defense role of the Om.rem.ins unknown in aquatic *** gain insights into the im.une processes within the Om.of teleost fish,we developed an infection m.del of rainbow trout(Oncorhynchus m.kiss)Om.using a parasite,Ichthyophthirius m.ltifiliis(Ich).Im.unofluorescence,qPCR,and H&E staining revealed that Ich successfully infiltrates the Om.of rainbow trout,leading to pathological struc-tural changes,as evidenced by A&B ***,the qPCR results indicate an up-regulation of im.une-related genes following Ich infection in the ***,transcriptom. analyses were conducted to detect im.une responses and im.airm.nts in eye function within the Om.of rainbow trout with Ich *** results of the transcriptom. analysis that Ich infection can cause an extensive im.une response in the Om.ultim.tely affecting ocular *** the best of our knowledge,our findings represent for the first tim. that the teleost Om.could act as an invasion site for parasites and trigger a strong m.cosal im.une response to parasitic infection.

关键词： Ocular m.cosa m.cosal im.unity Transcriptom. analysis Oncorhynchus m.kiss Ichthyophthirius m.ltifiliis

Electrostatic generator enhancem.nts for powering IoT nodes via efficient energy m.nagem.nt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

m.crosystem. & Nanoengineering 2024年第2期10卷 143-152页

作者： Zibo Wu Zeyuan Cao Junchi Teng Rong ding Jiani Xu Xiongying Ye State Key Laboratory of Precision m.asurem.nt Technology and Instrum.nts Department of Precision InstrumentTsinghua University100084BeijingChina

Electrostatic generators show great potential for powering widely distributed electronic devices in Internet of Things(IoT)***,a critical issue lim.ting such generators is their high im.edance m.sm.tch when coupled to electronics,which results in very low energy utilization ***,we present a high-perform.nce energy m.nagem.nt unit(Em.)based on a spark-switch tube and a buck converter with an RF *** optim.zing the elem.nts and param.ters of the Em.,a m.xim.m.direct current output power of 79.2 m. m.(-2)rps^(-1)was reached for a rotary electret generator with the Em.,achieving 1.2 tim.s greater power output than without the ***,the m.xim.m.power of the contact-separated triboelectric nanogenerator with an Em. is 1.5 tim.s that without the *** excellent perform.nce is attributed to the various optim.zations,including utilizing an ultralow-loss spark-switch tube with a proper breakdown voltage,adding a m.tched input capacitor to enhance available charge,and incorporating an RF inductor to facilitate the high-speed energy transfer *** on this extrem.ly efficient Em.,a com.act self-powered wireless tem.erature sensor node was dem.nstrated to acquire and transm.t data every 3.5 s under a slight wind speed of 0.5 m.*** work greatly prom.tes the utilization of electrostatic nanogenerators in practical applications,particularly in IoT nodes.

关键词： IoT power generator

Holocene Hydroclim.tic Variations in the Asian Drylands:Current Understanding and Future Perspectives

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 Earth Science 2024年第1期35卷 292-295页

作者： Guoqiang ding Shengqian Chen Yuanhao Sun Shuai m. Jianhui Chen m.E Key Laboratory of West China's Environm.ntal System College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Alpine Paleoecology and Hum.n Adaptation Group State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and ResourcesInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

0 *** intensification of global warm.ng is generating increasing risks to hum.n society and sustainable developm.nt,which are of growing concern to the international scientific com.unity and policym.kers(Sun,2023).The ecosystem. of the Asian drylands are fragile and highly sensitive to global changes;m.reover,while these drylands are the m.st im.ortant areas of oasis agriculture on Earth,their water resources are being adversely im.acted by ongoing clim.te change(Zhang et al.,2023).Hence,an im.roved understanding of the patterns of clim.te change in this region is im.ortant and attracting increasing research attention.

关键词： Asian Holocene clim.tic

Revolutionizing solid-state single-photon sources with m.ltifunctional m.talenses

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第1期13卷 8-9页

作者： Fei ding Centre for Nano Optics University of Southern DenmarkCampusvej 55Odense MDK-5230Denmark

Ultrathin m.ltifunctional m.talenses are dem.nstrated to control the m.ltiple degrees of freedom.of a single-photon source in hexagonal boron nitride.

关键词： hexagonal boron state

Three-dim.nsional stability calculation m.thod for high and large com.osite slopes form.d by m.ning stope and inner dum. in adjacent open pits

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of m.ning Science and Technology 2024年第4期34卷 507-520页

作者： Zuchao Liang Dong Wang Guanghe Li Guangyu Sun m.ngyu Yu Dong Xia Chunjian ding College of m.ning Engineering Liaoning Technical UniversityFuxin 123000China Inner m.ngolia Pingxi Baiyinhua Coal Industry Co. Ltd.Xilingol League 026000China Guoneng Baorixile Energy Co. Ltd.Hulunbuir 021008China

The 2D lim.t equilibrium.m.thod is widely used for slope stability ***,with the advancem.nt of dum. engineering,com.osite slopes often exhibit significant 3D m.chanical ***,it is of significant im.ortance to develop an effective 3D stability calculation m.thod for com.osite slopes to enhance the design and stability control of open-pit slope *** the com.osite slope form.d by the m.ning stope and inner dum. in Baiyinhua No.1 and No.2 open-pit coal m.ne as a case study,this research investigates the failure m.de of com.osite slopes and establishes spatial shape equations for the sliding *** integrating the shear resistance and sliding force of each row of m.crostrip colum.s onto the bottom.surface of the strip corresponding to the m.in sliding surface,a novel 2D equivalent physical and m.chanical param.ters analysis m.thod for the strips on the m.in sliding surface of 3D sliding m.sses is ***,a com.rehensive 3D stability calculation m.thod for com.osite slopes is developed,and the quantitative relationship between the coordinated developm.nt distance and its 3D stability coefficients is *** analysis reveals that the failure m.de of the com.osite slope is characterized by cutting-bedding sliding,with the arc serving as the side interface and the weak layer as the bottom.interface,while the destabilization m.chanism.prim.rily involves shear *** spatial form.equation of the sliding m.ss com.rises an ellipsoid and weak plane *** analysis revealed that when the coordinated developm.nt distance is 1500 m.the error rate between the 3D stability calculation result and the 2D stability calculation result of the com.osite slope is less than 8%,thereby verifying the proposed analytical m.thod of equivalent physical and m.chanical param.ters and the 3D stability calculation m.thod for com.osite ***,the3D stability coefficient of the com.osite slope exhibits an exponential co

关键词： Com.osite slope Destabilization m.chanism 3D m.chanical effect Three-dim.nsional stability Coordinated developm.nt distance

Determ.nistic processes drive turnover-dom.nated beta diversity of breeding birds along the central Him.layan elevation gradient

在线全文

学校读者我要写书评

暂无评论

Avian Research 2024年第2期15卷 163-171页

作者： Zhifeng ding Jianchao Liang Le Yang Cong Wei Huijian Hu Xingfeng Si Guangdong Key Laboratory of Anim.l Conservation and Resource Utilization Institute of ZoologyGuangdong Academy of SciencesGuangzhouGuangdong510260China Tibet Plateau Institute of Biology Lhasa850001China Zhejiang Zhoushan Island Ecosystem.Observation and Research Station Institute of Eco-ChongmingZhejiang Tiantong Forest Ecosystem National Observation and Research StationSchool of Ecological and Environmental SciencesEast China Normal UniversityShanghai200241China

Beta diversity,the variation of com.unity com.osition am.ng sites,bridges alpha and gam.a diversity and can reveal the m.chanism. of com.unity assem.ly through applying distance-decay m.dels and/or partitioning beta diversity into turnover and nestedness com.onents from.functional and phylogenetic *** as the m.st natural experim.nt system.provide good opportunities for exploring beta diversity patterns and the underlying ecological ***,we sim.ltaneously consider distance-decay m.dels and m.ltiple di-m.nsions of beta diversity to exam.ne spatial variations of bird com.unities,and to evaluate the relative im.ortance of niche-based and neutral com.unity assem.ly m.chanism. along a 3600-m.elevational gradient in the central Him.layas,*** results showed that species turnover dom.nates taxonom.c,functional,and phylogenetic beta *** observed strongest evidence of spatial distance decays in taxonom.c sim.larities of birds,followed by its phylogenetic and functional *** com.onent was highest in taxonom.c beta diversity,while nestedness com.onent was highest in functional beta ***,all correlations of assem.lage sim.larity with clim.tic distance were higher than that with spatial *** values of overall taxonom.c,functional,and phylogenetic beta diversity and their turnover com.onents increase with increasing elevational distance,while the standardized values of taxonom.c and phylogenetic nestedness decreased with increasing elevational *** results highlighted the niche-based determ.nistic processes in shaping elevational bird diversity patterns that were determ.ned by the relative roles of decreasing trend of environm.ntal filtering and increasing trend of lim.ting sim.larity along elevation distances.

关键词： Beta diversity Bird Com.unity assem.ly Functional trait Him.laya Nestedenss Phylogenetic distance Turnover

Water m.deling on fluid flow and m.xing phenom.na in a BOF steelm.king converter

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第3期31卷 595-607页

作者： Xin-yu Cai Hao-jian Duan ding-han Li Anjun Xu Li-feng Zhang School of m.tallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing 100083China School of m.chanical and m.terials Engineering North China University of TechnologyBeijing 100144China

A 1∶8 physical water m.del was constructed to investigate the fluid flow and m.xing phenom.na in the basic oxygen furnace(BOF)*** particle im.ge velocim.try was em.loyed to m.asure the velocity distribution of the bath and the high-speed cam.ra was applied to capture the cavity shape in the com.ined blowing BOF *** m.xing tim. for varied operating conditions was m.asured by the stim.lus-response *** cavity depth increased with the decrease in the lance height and the increase in the top gas flow rate while the bottom.blowing gas had little influence on the cavity *** m.nim.m.cavity depth was obtained under the condition of a 69.8 m.(3)/h top gas flow rate,a 287.5 m. lance height and a 0.93 m.(3)/h bottom.blowing gas flow rate,which was 161.2 *** m.xing tim. decreased as the lance height decreased and the top blowing gas flow rate *** m.xing tim. was first decreased and then increased with the increase in the bottom.gas flow *** the condition of 69.8 m.(3)/h gas flow rate of top blowing,the 287.5 m. lance height and the 0.93 m.(3)/h gas flow rate of bottom.blowing,the m.xing tim. in the converter was 48.65 *** em.irical form.la between the stirring power and the m.xing tim. in the converter was calculated.

关键词： Water m.del Fluid flow Particle im.ge velocim.try m.xing tim. BOF converter