基于位移控制CFRP板新型锚具锚固性能研究

为探究通过位移控制施加预紧力的CFRP板锚具的锚固性能,明确静载作用下锚具的锚固效率及CFRP板的受力机理,对新型曲面夹持式锚具进行设计,锚具构件由钢制夹板以及限位板组成.夹板通过弧面设计避免端口效应产生的剪切破坏,通过改变限位板厚度,控制夹板挤压位移,以达到调控预紧力的目的.通过8组16次试件锚具静载试验,探究限位板...     

碳纳米管电极对铅和铜的检测研究

用碱性缓冲溶液分散碳纳米管(CNTs),通过层层自组装的方法构筑了聚二甲基烯丙基氯化铵(PDDA)/CNTs多层膜电极,采用差分脉冲伏安法同时测定。紫外-可见光谱法对PDDA/CNTs多层膜的组装过程进行了表征。研究了PDDA/CNTs组装层数、支持电解质种类、富集电位和富集时间等对溶出峰电流的影响。该多层膜修饰电极检测铅、铜离子具有良好的线性范围和抗干扰能力。     

基于反推方法的交通运输行业碳排放评估研究

交通运输行业碳排放量化评估对城市低碳策略的制定与实施具有重要参考价值.研究集成趋势预测与落差分析,提出一种基于反推方法的交通运输行业碳排放量测算方法,该方法综合交通运输方式结构以及相应能耗因子与碳排放水平特征,以客运、货运周转量等宏观交通运行指标为依据,衔接终端能源消费与碳排放量,估算碳排放的现状与趋势,反推实现碳排放控制目标的落差与可能实施路径.     

Experimental and stowing/deploying dynamical simulation of lenticular carbon fiber reinforced polymer thin-walled tubular space boom

The stowing and deploying experiment was conducted for three 700 mm long thin-walled tubes, and the structural behavior characteristics parameters were measured clearly, including strain, deformation and wrapping moment. 3D finite element models (FEM) were built subsequently and explicit dynamic method was used to simulate the stowing and deploying of the lenticular carbon fiber reinforced polymer (CFRP) thin-walled tubular space boom, which was designed as four-ply (45°/ − 45°/45°/ − 45°) lay-up. The stress and energy during the wrapping process were got and compared with different wrapping angular velocity, the reasonable wrapping angular velocity and effective method were conformed, and structural behavior characteristics were obtained. The results were compared and discussed as well, and the results show that the numerical results by 0.628 rad/s velocity agree well with the measured values. In this paper, the numerical procedure and experimental results are valuable to the optimization design of CFRP thin-walled tubular space boom and future research.     

碳气凝胶的制备及结构

以甲醛和间苯二酚溶胶凝胶制备有机气凝胶（OA）,将有机气凝胶在半密封的情况下干燥,再在高温下碳化,制备得到碳气凝胶（CA）,并分析了有机气凝胶的形成机理.通过红外（IR）、透射电镜（TEM）、X射线衍射（XRD）等考察了有机气凝胶到碳气凝胶的结构变化,从具有丰富的官能团结构的有机物,最后碳化得到具有纳米尺度、无序的、连续三维网络结构的碳材料.     

Adsorption models and structural characterization for activated carbon fibers

The nitrogen adsorption isotherms at 77.69 K were measured for two samples of activated carbon fibers and their microstructures were investigated. Among established isotherm equations, the Dubinin-Radushkevich equation showed the best agreement with the experimental data, while the Langmuir equation showed a large deviation when employed at low relative pressures. The MP method, t-method and αs-method were used to analyze the pore size distribution. The calculated average pore widths and BET (Brunauer-Emmett-Teller) surface areas for the sample A-13 were 0.86 nm and 1 286.60 m2/g, while for the sample A-16, they were 0.82 nm and 1 490.64 m2/g. The sample with larger pore width was more suitable to be used as additive in chemical heat pumps, while the other one could be used as adsorbent in adsorption refrigeration systems.     

预应力碳纤维布长期性能的探讨

结合2006年江苏某高速公路桥梁预应力碳纤维布施工情况,就预应力碳纤维布的抗剥离能力、抗剪能力、结构胶的老化性能等长期性能进行有益的探讨和研究,提出改进措施,并建议目前应谨慎使用预应力碳纤维布。     

载铁颗粒活性炭吸附除铬的热动力学研究

该文通过吸附动力学实验及等温吸附实验,考察了在10℃～40℃的温度条件下载铁颗粒活性炭(IOCGAC)吸附Cr(VI)的热动力学性质。结果表明:准二级反应动力学模型及Langmuir等温吸附模型可分别较好地描述IOCGAC对Cr(VI)的吸附动力学及吸附等温线实验结果(R2>0.99);吸附速率及吸附容量随温度的增加而增加。吸附速率k从0.00022增加到0.00033,吸附容量从18.48mg/g增加到23.20mg/g。根据标准吉布斯自由能变(ΔG0<0)和标准反应焓变(ΔH0>0)值判断,IOCGAC对Cr(VI)的吸附是自发的、吸热的化学吸附反应。     

碳纤维加固技术在市政工程领域的应用探讨

采用碳纤维材料进行结构加固是近年来出现并广泛应用于工业与民用建筑领域的一种结构加固技术。该文结合工程实践,认为随着城市基础设施维护与更新的工程项目越来越多,未来该技术也将在市政工程领域得到广泛运用。     

碳纤维布加固梁式桥施工探讨

碳纤维质量轻、抗拉强度高、耐腐蚀、抗老化,有着优异的力学性能,用其加固补强混凝土结构施工简单便捷,在桥梁维修加固中得到了广泛的应用。碳纤维加固修补结构技术是继加大混凝土截面、粘贴钢板之后的又一种新型的结构加固技术。在对碳纤维加固梁式桥的机理及受力特点进行介绍的基础之上,就其施工所用材料、施工工艺深入分析,并给出有益的施工建议,对于碳纤维布加固技术的应用推广具有一定的指导意义。