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胶合板和定向板平面内的吸湿膨胀

中国人造板 1997年第1期7卷 3-4页

作者： ELEmER m.lang JOSEPH R.LOFERSKI 罗敏生

对市场上的胶合板和定向板在长度和宽度方向上的自由吸湿膨胀系数和限制平面内吸湿膨胀后的弹性恢复进行了测试。经过预处理后的试件暴露在室温和高湿度条件下,测定含水率和尺寸的变化,计算出平面内的吸湿膨胀系数(α)和其中的弹性恢复... 详细信息

对市场上的胶合板和定向板在长度和宽度方向上的自由吸湿膨胀系数和限制平面内吸湿膨胀后的弹性恢复进行了测试。经过预处理后的试件暴露在室温和高湿度条件下,测定含水率和尺寸的变化,计算出平面内的吸湿膨胀系数(α)和其中的弹性恢复部分(α＇)。试验结果可用来评价结构用人造板在相对湿度变化条件下的尺寸稳定性。本报告还详细叙述了试验程序和测量技术。试验结果与文献资料的记载有可比性。

关键词：吸湿膨胀人造板胶合板平面内尺寸稳定性线膨胀相对湿度含水率粘弹性单元厚度膨胀

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木质复合板的吸湿变形

中国人造板 1997年第3期7卷 5-8页

作者： ELEmER m.lang JOSEPH R.LOFERSKI J.DANIEL DOLAN 吕斌

本文主要描述:利用力学原理推测木质复合板的吸湿变形以及实验程序。将美国胶合板协会规定的五合板和定向刨花板放在相对湿度为95％条件下进行处理,并且在此条件下,板子只能从一面吸收水份。处理后,测量在长度和宽度方向上的园筒状的变... 详细信息

本文主要描述:利用力学原理推测木质复合板的吸湿变形以及实验程序。将美国胶合板协会规定的五合板和定向刨花板放在相对湿度为95％条件下进行处理,并且在此条件下,板子只能从一面吸收水份。处理后,测量在长度和宽度方向上的园筒状的变形,并且将实际测量值与推测值相比较,结果:推测值与实际测量值之间有较好的规律。

关键词：木质复合板定向刨花板曲率半径含水率梯度翘曲变形吸湿膨胀可变传感器弹性变形力学原理主要方向

UNCONVENTIONAL mETALLIC STATE IN YbRh2(Si1-XGeX)2-A HIGH PRESSURE STUDY

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UNCONVENTIONAL METALLIC STATE IN YbRh2(Si1-XGeX)2-A HIGH PRE...

Tensile strength behavior of cement-stabilized dredged sediment reinforced by polypropylene fiber

18th International Conference on High Pressure Science and Technology

作者： S.mederle R.Borth J.Custers P.Gegenwart C.Geibel F.m.Grosche P.Hinze m.lang C.langhammer G.Sparn O.Trovarelli H.Q.Yuan F.Steglich max-Planck-Institute for the Chemical Physics of Solids Nothnitzer Str.40.D-01187 DresdenGermany

The study of 3d- and 4f-electron compounds on thethreshold of magnetism has brought to light a number ofmetals with electronic properties deviating significantlyfrom the behavior expected for a conventional LandauFermi-liquid(FL)(△p∝T,△C/T=const.).Fromtheoretical grounds,these non-Fermi-liquid (NFL) effectsare expected not just at,but also in the vicinity of aquantum critical point (QCP)at which a magnetic orderingtemperature vanishes(T→0).In order to avoid the effectof disorder(*** by alloying) in the study ofquantum critical phenomena it is highly desirable toinvestigate stoichiometric ***,onlya few such HF compounds exist which exhibit NFLbehavior at ambient pressure (UBe,CeNiGe,CeCuSi)[1].The number of stoichiometric candidates can beincreased by utilizing hydrostatic pressure as a controlparameter to drive magnetically ordering HF compoundsclose to a QCP(e.g.,CePdSi,CeIn)[2].A deeper

关键词： High Pressure YbRh2Si2 Resistivity Non Fermi Liquid.

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Frontiers of Structural and Civil Engineering 2024年第3期18卷 380-392页

作者： Lei lang Jiangshan LI Xin CHEN Lijun HAN Ping WANG State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicChinese Academy of SciencesWuhan 430071China Hubei Provincial Key Laboratory of Contaminated Sludge and Soil Science and Engineering Wuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

This study evaluated the feasibility of using polypropylene fiber(PF)as reinforcement in improving tensile strength behavior of cement-stabilized dredged sediment(CDS).The effects of cement content,water content,PF content and length on the tensile strength and stress–strain behavioral evolutions were evaluated by conducting splitting tensile strength ***,the micro-mechanisms characterizing the tensile strength behavior inside PF-reinforced CDS(CPFDS)were clarified via analyzing macro failure and microstructure *** results indicate that the highest tensile strengths of 7,28,60,and 90 d CPFDS were reached at PF contents of 0.6%,1.0%,1.0%,and 1.0%,exhibiting values 5.96%,65.16%,34.10%,and 35.83%higher than those of CDS,***,3 mm,PF of showed the best reinforcement *** CPFDS exhibited obvious tensile strain-hardening characteristic,and also had better ductility than *** mix factor(C_(C)^(a)/C_(w)^(b))and time parameter(q_(t0)(t))of CDS,and the reinforcement index(k_(t-PF))of CPFDS were used to establish the tensile strength prediction models of CDS and CPFDS,considering multiple *** PF“bridge effect”and associated cementation-reinforcement coupling actions inside CPFDS were mainly responsible for tensile strength behavior *** key findings contribute to the use of CPFDS as recycled engineering soils.

关键词： dredged sediment chemical stabilization fiber reinforcement splitting tensile strength micro-mechanisms

Coupling effect of cement-stabilization and biopolymer-modification on the mechanical behavior of dredged sediment

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Journal of Rock mechanics and Geotechnical Engineering 2024年第8期16卷 3284-3298页

作者： Lei lang Jiangshan Li Xiao Huang Ping Wang Wei Zhang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Hubei Provincial Key Laboratory of Contaminated Sludge and Soil Science and Engineering Wuhan430071China University of Chinese Academy of Sciences Beijing100049China

Nowadays,biopolymer stabilization as a promising eco-friendly approach in soft ground improvement has attracted wide ***,the feasibility of using biopolymer as a green additive of cementstabilized dredged sediment(CDS)with high water content is still *** this study,guar gum(GG)and xanthan gum(XG)were adopted as typical biopolymers,and a series of unconfined compressive strength(UCS),splitting tensile strength(STS)and scanning electron microscopy(SEm)tests were performed to evaluate the mechanical and microstructural properties of XG-and GG-modified CDSs considering several factors including biopolymer modification,binderesoil ratio and wateresolid ***,the micro-mechanisms revealing the evolutions of mechanical properties of biopolymermodified CDS were *** results indicate that the addition of XG can effectively improve the strength of CDS,while the GG has a side *** XG content of 9%was recommended,which can improve the 7 d-and 28 d-UCSs by 196%and 51.8%,together with the 7 d-and 28 d-STSs by 118.3%and 42.2%,*** the binderesoil ratio or decreasing the wateresolid ratio significantly improved the strength gaining but aggravated the brittleness characteristics of *** XG to CDS contributed to the formation of microstructure with more compactness and higher cementation degrees of ordinary Portland cement(OPC)-XG-stabilized DS(CXDS).The micro-mechanism models revealing the interactions of multiple media including OPC cementation,biopolymer film bonding and bridging effects inside CXDS were *** key findings confirm the feasibility of XG modification as a green and high-efficiency mean for improving the mechanical properties of CDS.

关键词： Dredged sediment(DS) Stabilization Biopolymer modification mechanical properties micro-mechanism

荷能重离子辐照常规和高压条件下磷灰石的损伤研究

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荷能重离子辐照常规和高压条件下磷灰石的损伤研究

An empirical method for joint inversion of wave and wind parameters based on SAR and wave spectrometer data

第九届全国固体核径迹学术研讨会

作者：刘杰 U.A.Glasmacher m.lang C.Trautmann K.-0.Voss R.Neumann G.A.Wagner R.miletich 中科院近物所德国海德堡大学地质研究所德国重离子研究中心德国海德堡马普核物理研究所德国海德堡大学矿物研究所

单晶磷灰石(Durango)样品放置于金刚石压腔(DAC)中的两块厚度～1．5-mm 金刚石压砧之间, 加压至10．5 GPa。利用德国重离子研究中心(GSI)的同步加速器(SIS)产生的初始能量106 meV/u 的 Kr 离子辐照装有样品的压腔。离子穿过真空窗、空气...

单晶磷灰石(Durango)样品放置于金刚石压腔(DAC)中的两块厚度～1．5-mm 金刚石压砧之间, 加压至10．5 GPa。利用德国重离子研究中心(GSI)的同步加速器(SIS)产生的初始能量106 meV/u 的 Kr 离子辐照装有样品的压腔。离子穿过真空窗、空气,以及一个压砧后到达样品的能量为25

关键词：

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Acta Oceanologica Sinica 2024年第5期43卷 133-144页

作者： Yong Wan Xiaona Zhang Shuyan lang Ennan ma Yongshou Dai College of Oceanography and Space Informatics China University of PetroleumQingdao 266580China National Satellite marine Application Center Beijing 100081China Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural ResourcesBeijing 100081China College of Control Science and Engineering China University of PetroleumQingdao 266580China

Synthetic aperture radar(SAR)and wave spectrometers,crucial in microwave remote sensing,play an essential role in monitoring sea surface wind and wave ***,they face inherent limitations in observing sea surface *** systems,for instance,are hindered by an azimuth cut-off phenomenon in sea surface wind field *** spectrometers,while unaffected by the azimuth cutoff phenomenon,struggle with low azimuth resolution,impacting the capture of detailed wave and wind field *** study utilizes SAR and surface wave investigation and monitoring(SWIm)data to initially extract key feature parameters,which are then prioritized using the extreme gradient boosting(XGBoost)*** research further addresses feature collinearity through a combined analysis of feature importance and correlation,leading to the development of an inversion model for wave and wind parameters based on XGBoost.A comparative analysis of this model with ERA5 reanalysis and buoy data for of significant wave height,mean wave period,wind direction,and wind speed reveals root mean square errors of 0.212 m,0.525 s,27.446°,and 1.092 m/s,compared to 0.314 m,0.888 s,27.698°,and 1.315 m/s from buoy data,*** results demonstrate the model’s effective retrieval of wave and wind ***,the model,incorporating altimeter and scatterometer data,is evaluated against SAR/SWIm single and dual payload inversion methods across different wind *** comparison highlights the model’s superior inversion accuracy over other methods.

关键词： synthetic aperture radar(SAR) wave spectrometer extreme gradient boosting(XGBoost) joint inversion method wave and wind parameters

Stress Concentration Effect in Interface Between Conductor and Epoxy Resin in Coaxial Components of Power Equipment

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 412-420页

作者： Chuang Wang Kang Lei Qing Sun Hui Li Jiawei Zhang lang Zhao Zongren Peng School of Electrical Engineering Xi’an University of TechnologyXi’an 710054China Xi’an Power Supply Company State Grid Shaanxi Electric Power CompanyXi’an 710032China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China

The spacer used in gas insulated switchgear(GIS)plays a vital role in its safe *** mismatch of mechanical properties between conductor and insulating material in spacers results in stress concentration at the interface between *** a hydrostatic test,mechanical damages are often initiated from the *** this paper,the stress between aluminum conductors and epoxy resin is studied by using a simplified coaxial structure *** measurement system and finite element simulation are used to explore the generation of stress and strain during curing and *** real-time measurement of strain at the interface shows that the residual strain in the entire process is primarily generated during the cooling ***,the temperature and stress/strain distribution at the interface during the cooling stage are further studied,and combined with experiments and *** consistency between the finite element simulation and the experimental measurement results verifies the validity of the simulation method *** results show that the maximum of the first principal stress generated during the cooling stage of the production process is concentrated on the upper and lower edges of the interface which is critical to the impact of the production quality of the spacer.

关键词： Epoxy resin GIS interface stress/strain distribution

Ultrathin organic solvent nanofiltration membrane with polydopamine-HKUST-1 interlayer for organic solvent separation

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Journal of Environmental Sciences 2024年第7期141卷 182-193页

作者： Haike Li Xindong Li Guozai Ouyang Lijinhong Huang lang Li Wenhao Li Wanfu Huang Duokun Li Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and TechnologyGanzhou 341000China Innovation Center for Water Quality Security Technology at Ganjiang River Basin Jiangxi University of Science and TechnologyGanzhou 341000China School of Architecture and Design Jiangxi University of Science and TechnologyGanzhou 341000China WA School of mines:minerals Energy and Chemical EngineeringCurtin UniversityWA 6845Australia School of materials Science and Engineering Tiangong UniversityTianjin 300387China

Polydopamine(PDA)and metal-organic skeleton HKUST-1 were co-deposited on the base membrane of hexamethylenediamine(HDA)-crosslinked polyetherimide(PEI)ultrafiltration membrane as the interlayer,and high-throughput organic solvent nanofiltration membrane(OSN)was prepared by interfacial polymerization and solvent activation *** polyamide(PA)layer surface roughness from 28.4 nm in PA/PEI to 78.3 nm in PA/PDA-HKUST-10.6/PEI membrane,reduced the thickness of the separation layer from 79 to 14 nm,and significantly improved the hydrophilic,thermal and mechanical *** flux of the PA/PDA-HKUST-10.6/PEI membrane in a 0.1 g/L Congo Red(CR)ethanol solution at 0.6 mPa test pressure reached 21.8 L/(m^(2)·hr)and the rejection of CR was 92.8%.Solvent adsorption test,N,N-dimethylformamide(DmF)immersion experiment,and long-term operation test in ethanol showed that the membranes had high solvent *** solvent flux test demonstrated that,under the test pressure of 0.6 mPa,the flux of different solvents ranked as follows:methanol(56.9 L/(m^(2)·hr))>DmF(39.6 L/(m^(2)·hr))>ethanol(31.2 L/(m^(2)·hr))>IPA(4.5 L/(m^(2)·hr))>N-hexane(1.9 L/(m^(2)·hr)).The ability of the membranes to retain dyes in IPA/water dyes solution was also *** flux of the membrane was 30.4 L/(m^(2)·hr)and the rejection of CR was 91.6%when the IPA concentration reached 50%.This OSN membrane-making strategy is economical,environment-friendly and efficient,and has a great application prospect in organic solvent separation systems.

关键词： Interfacial polymerization Organic solvent nanofiltration Interlayer metal-organic frameworks Polydopamine