为了对比分析基质沥青、SBS改性沥青、橡胶改性沥青的自愈合性能,并研究沥青种类、愈合环境、破坏程度对混合料疲劳—自愈合进程的影响.通过DSR(动态剪切流变仪)的Time-Sweep(时间扫描)模式测试了沥青复数剪切模量随加载次数的变化,采用愈合指数HI评价沥青的自愈合能力;利用DSC(差示扫描量热仪)测试沥青相态转变过程中的焓变;基于四点弯曲疲劳试验测试了混合料劲度模量随加载次数的变化.研究结果表明:从流变性角度分析,橡胶改性沥青的自愈合性能最好,SBS改性沥青次之,基质沥青最差,随着损伤度的增大,以上3种沥青的自愈合指数呈下降趋势;从分子扩散角度考虑,基质沥青的自愈合能力最小,基质沥青愈合裂缝的能力优于SBS改性沥青及橡胶改性沥青.沥青类型及愈合环境对混合料的愈合进程具有重要影响,提高愈合环境的温度可以加速混合料的愈合,破坏程度的增加对混合料的自愈合具有负面影响.

A three-stage gas gun, composed of a two-stage gas gun and the add-on part, has been developed to launch high-Z (tantalum, for example) flyer plates up to 10 km/s for ultrahigh-pressure Hugoniot measurements. Great care has been taken to optimize the add-on part in which a specially designed graded density impactor is employed to quasi-isentropically accelerate the high-Z flyer plate for maximizing its impact velocity. The shock wave in the target generated by the flyer plate is characterized with the flatness of the shock-front better than 1 ns in the concerned area and the uncertainty of the shock-wave velocity less than 2%, thus satisfying the requirements for high-precision Hugoniot measurements. As a demonstration, we measured the ultrahigh-pressure Hugoniot equation of state of tantalum ranging from 0.45 TPa to 0.85 TPa with a symmetric impacting geometry in which the shock-wave velocity and the particle velocity are simultaneously determined. The results obtained are well consistent with data available in the literature, indicating the extended capability of the gas-gun launcher technique.

基于流变学理论研究橡胶粉与不同来源基质沥青的配伍性,采用动态剪切流变仪(DSR)分别对不同基质沥青加工而成的橡胶沥青进行应变扫描、温度扫描、频率扫描等常规动态剪切流变试验,从相位角、复合模量和车辙因子等指标评价橡胶沥青黏弹特性,定性区分沥青四组分对橡胶沥青黏弹特性的影响,并对橡胶沥青进行滞回环试验,运用灰色关联数学分析方法定量给出沥青四组分对橡胶沥青的残余变形、弹性贮能、耗散能、弹性比例和复合弹性模量等指标的影响.结果表明:流变学理论是研究橡胶粉改性剂与基质沥青配伍性的有效方法;从能量角度评价沥青四组分对橡胶沥青黏弹特性指标的影响,沥青质对橡胶沥青残余应变影响较大;胶质组分对橡胶沥青弹性贮能和耗散能影响最大,而芳香分影响最小;沥青质组分对橡胶沥青弹性比例参数影响最大;芳香分含量可以提高橡胶沥青复合模量.

1、宾客对于绿色饭店室内环境的诉求 近年来,随着各大城市之间商务出行的频次不断攀升,加之受全民旅游出行需求的强劲推动,我国酒店行业得到了蓬勃发展.据统计,近十年来高星级酒店保持了每年10％以上的客房增长速度.新建的酒店建筑往往呈现超高层、大体量、高标准、综合业态复合的特点.与此同时,也呈现出用能强度大、室内环境性能层次不齐等问题.

采用Cross、Carreau流动模型及Matlab、Origin计算软件对8种不同基质沥青加工而成的橡胶沥青零剪切黏度（Zero shear-rate viscosity,ZSV）进行拟合,以灰色关联理论方法分析沥青四组分与橡胶沥青ZSV的相关性,并讨论不同加载模式下橡胶沥青ZSV的变异性,研究影响橡胶沥青ZSV的敏感因素。结果表明:Cross模型对橡胶沥青样本数据的拟合程度较Carreau模型高;静态加载模式和动态加载模式下所拟合的橡胶沥青ZSV存在差异,重复蠕变试验蠕变阶段拟合结果和恢复阶段拟合结果处于同一数量级内,Brookfield黏度计测定拟合的橡胶沥青ZSV随着试验温度增加而减小;沥青四组分与橡胶沥青频率扫描试验、重复蠕变试验和不同温度橡胶沥青旋转剪切黏度关联结果一致,即芳香分对橡胶沥青ZSV敏感性最强。

新能源汽车是当前汽车产业变革的重点方向,新能源车辆电池安全监控、车联网信息化发展成为业界关注的焦点.围绕新能源车电池管理数据的实时监测,研发4G通信的车载物联终端进行联网,实现车联网多参数传感数据采集、上传、存储、智能处理等功能,提供在线监测与故障预警分析的新能源汽车云平台服务.

In this study,viscoelastic properties of rubber modified asphalt were evaluated based on the rheological theory.Using dynamic shear rheometer,the matrix asphalt,modified asphalt,rubber modified asphalt with different additives,dry rubber particles and industrialized rubber asphalt were tested,respectively,for their hysteresis loops.Based on the indices such as the residual deformation,elastic energy-storage,elastic ratio and composite elastic modulus,the effects of modifying agent on the modification and viscoelastic properties of rubber asphalt were analyzed,and then,the conventional dynamic shear rheological tests were conducted on the samples for four types of scanning,namely strain scanning,temperature scanning,frequency scanning and time scanning.The results show that the properties of rubber modified asphalt are better than those of the matrix asphalt and the modified asphalt under high temperature;different modifying agents have significantly different effects on the modification of composited rubber asphalt,and among the modifying agents,the PE agent can improve the permanent deformation resistance of asphalt rubber,but its fatigue resistance is poor;the rock asphalt can increase the stiffness,viscous flow and fatigue resistance of rubber asphalt,;the swelling effects of desulfurization rubble powder and modifying agents are remarkable;The fatigue properties of industrialized rubber asphalt and dry rubber particles are obvious,and hence,rubber asphalt shall be composited and modified according to the needs in different application cases.

为了给产业界各方梳理物理网技术与应用的发展现状以更好地促进物联网技术创新,对物联网主流技术、主流操作系统、LPWAN、物联网通信协议等进行了技术演进探讨和产业应用发展方面的对比分析,同时对当前物联网热点应用进行了讨论,其中包括如车联网、移动支付、智能家居、智能制造等,并分析了这四大类应用的市场发展与应用推广前景,探索了物联网应用的发展趋势.

针对自洽强度方法存在的冲击加载-再加载的难题,提出了一种采用较高硬度材料为支撑制作组合飞片的简便方法.利用该方法获得了铝、锡和锆基金属玻璃较理想的冲击加载-再加载粒子速度剖面,验证了该方法的有效性.由本文获得的冲击加载-再加载粒子速度剖面,并根据自洽方法,计算得到了铝、锡和锆基金属玻璃再加载过程剪应力变化数据.进一步分析表明,在本文涉及的压力范围内,仅由冲击加载-卸载实验得到的铝、锡和锆基金属玻璃屈服强度将比实际结果降低20％～50％.因此,在采用自洽方法计算高压强度时,冲击加载-再加载数据不可或缺.

Computational design of the cavity in the enhanced hypervelocity launcher was carried out using Eulerian code Multi-Fluid Piecewise Parabolic Method (MFPPM).Three kinds of improved configurations of the cavity were presented with varied angles of the cavity.We numerically investigated the effects of the angle and the thickness of the TPX on the velocity,the velocity difference and the planarity of the flier.Our results show that with the given thicknesses and position of the target,the planarity and the velocity of the flier launched by the second kind of the improved configuration are significantly improved,but the range of the planarity is reduced and the velocity differences of the flier surface are increased so that the desirable planarity cannot be maintained.

In order to promote the development of smart logistics, industry characteristics, key applications and informatization evolution of smart logistics were analyzed from aspects of hot spots at present of "Industry 4.0" and "Internet +", "public entrepreneurship, innovation”. In addition, the main application scenes of IoT technology in logistics industry were mainly discussed. New applications of new NB-IoT, unmanned plane and big data were introduced. The developmental trend of smart logistics was elaborated from technical perspective.

文章针对车路路汽车综合信息化服务为核心，围绕车况数据采集分析、路况信息服务应用、车务服务应用、车生活服务应用、车服务能力开放和基础管理功能等进行分析，介绍车联网移动服务平台的基本要素，探讨汽车服务产业链合作发展和车联网应用的运营模式创新。

Dynamic strength behavior of Zr51Ti5Ni10Cu25Al9 bulk metallic glass（BMG） up to 66 GPa was investigated in a series of plate impact shock-release and shock-reload experiments.Particle velocity profiles measured at the sample/Li F window interface were used to estimate the shear stress,shear modulus,and yield stress in shocked BMG.Beyond confirming the previously reported strain-softening of shear stress during the shock loading process for BMGs,it is also shown that the softened Zr-BMG still has a high shear modulus and can support large yield stress when released or reloaded from the shocked state,and both the shear modulus and the yield stress appear as strain-hardening behaviors.The work provides a much clearer picture of the strength behavior of BMGs under shock loading,which is useful to comprehensively understand the plastic deformation mechanisms of BMGs.

为了在气炮上实现应变率为105～106 s-1的复杂加载技术研究,采用自行研制的拉格朗日程序MLEP(multi-material Lagrangian elastic-plastic)对Al-Cu-W材料体系的阻抗梯度飞片复杂加载不锈钢靶板进行数值模拟,计算设计并分析了阻抗梯度飞片的厚度和密度分布指数对靶板压力、速度和应变率峰值等波形的影响.结果表明:密度指数分布越大,加载时间越短,加载后期的压力、速度和应变率峰值曲线更陡峭;同时,为了避免靶板/LiF窗口界面反射的稀疏波早于阻抗梯度飞片后界面反射的稀疏波达到碰撞面位置,计算设计中还考虑了飞片厚度的影响.此外,对基于理论设计的阻抗梯度飞片进行了动态考核实验,实验结果基本反映了预期的设计,为材料强度的测量奠定了基础.

以粉煤灰和水玻璃粉体为原料制备地质聚合物干粉材料,研究不同粉煤灰基地质聚合物干粉掺量对粉煤灰基地质聚合物/水泥复合材料力学性能的影响,通过XRD和SEM分析粉煤灰和粉煤灰基地质聚合物/水泥复合材料的物相组成和微观结构.结果表明,粉煤灰基地质聚合物干粉掺量从0增加到60％,复合材料的抗折强度和抗压强度减少,折压比增加,主要是因为粉煤友基地质聚合物常温下反应时间长,随着粉煤灰基地质聚合物干粉掺量的增加,反应产物中地质聚合物凝胶比例增加,90 d后试样的折压比增加.

When the convergent hypervelocity launcher is applied to measure the equation of states,the second stage flyer are required to have well impact planarity and high impact velocity.Taking this into consideration,our paralleled Eulerian code HVL-MFPPM is employed to investigate the hypervelocity launcher.According to the simulation results,the structure and dimensions of the first stage flyer are optimized.Finally,the best scheme (the diameter of the first stage flyer is 20 mm,and its thickness is 1.8 mm)is obtained,which leads to the successful launch of an intact gram magnitude tantalum flyer to a velocity over 14 km/s in numerical simulation,and significant improvements in the impact velocity and planarity of the second stage flyer.

厂改SBS改性剂关键原材料的控制研究在国内尚未展开,文章课题组通过8年的努力,在国内首次提出了采用化学滴定结合荧光显微镜分析法测试SBS掺量及其加工质量,并结合工程推广应用实践情况,通过室内研究与现场测试,证明了该方法能够实现现场便捷控制的目标.

基于场变量的强度折减法,以三维一般边坡和陡边坡作为算例模型,对非均质边坡的折减范围进行研究.研究中借鉴某学者研究成果,在ABAQUS中对岩体材料的抗剪强度参数(c,φ)和抗拉强度参数T同时进行强度折减,并结合目前边坡失稳判据存在的不足,提出采用坡体内关键部位特征点位移增量Δδ与强度折减系数增量ΔFt之比值Δδ/ΔFt和强度折减系数Ft关系曲线的突变点来确定边坡的临界失稳状态.结果表明,对于一般边坡,只有当黏聚力相差不大的情况下,对黏聚力较小土层实施局部折减才能得到合理的安全系数,对于坡体内存在岩质相差较大的边坡建议采用整体强度折减,相反对于高陡三维边坡而言对相对较软的岩体进行局部折减可以得出较为可信的结果.通过与传统特征点位移法判据相比较,验证了Δδ/ΔFt-Ft法的实用性和合理性,同时基于该判据计算出桥基边坡运营期间的安全系数,可为岸坡治理提供理论依据..

A series of reverse-impact experiments is performed on vanadium at peak shock pressures from 32 GPa to 88 GPa. A displacement interferometer is used to measure the particle velocity profile at the vanadium/LiF window interface. Analysis of these profile provides a measure of sound velocity of vanadium in the Hugoniot state. The transition from body-centered cubic structure to rhombohedral structure phase at ～ 60 GPa is identified by the discontinuity of the sound velocity against shock pressure. This transition pressure is consistent with the data from high pressure diamond anvil cell experiments and first-principle calculations.

Combined with domestic relevant standards,this article proposed the cement concrete pavement warping void detectionmethods and determinationcriteria,used the deflectionvalue method inangle plates after 24h continuous detection of FWD to carry out the void detection for the cement concrete pavement of different base layers in Guangxi region,and compared and analyzed the differences between their respective characteristics and performance as well as the causes of warping void phe-nomena.It also proposed the void detection requirements of cement concrete pavement of different base layers as well as reasonable detection timing.