赤泥-矿渣基地聚物固化黄土冻融后力学特性研究

本文通过击实试验获得了不同赤泥掺量、水玻璃模数、水玻璃掺量条件下地聚物固化黄土的最大干密度和最佳含水率;基于最佳含水率结果制作试块并开展地聚物固化黄土冻融循环试验,测试了固化黄土试块的质量损失和无侧限抗压强度,分析了地聚物组成对固化黄土试块抗冻性能的影响。结果表明：地聚物固化黄土试块的最大干密度均小于素黄土;掺入适量地聚物能够有效提升黄土的抗冻性能,且固化黄土的无侧限抗压强度均大于素黄土,最高可达0.7 MPa;随着赤泥掺量增大,固化黄土试块的无侧限抗压强度降低;随着冻融次数增加,固化黄土试块的无侧限抗压强度先减小后增加,最终趋于稳定。     

Preparation of La MnO_3/graphene thin films and their photocatalytic activity

A novel photocatalyst of La MnO3/graphene thin films with the perovskite-type was synthesized by sol-gel process assisted with spin-coating methods on glass substrates.The prepared samples were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD), Brumauer-Emmett-Teller(BET) surface area analyzer, X-ray photoelectron spectroscopy(XPS) and UV-vis diffuse reflectance spectroscopy.Results showed that after the introduction of graphene, the perovskite structure was unchanged and the size of La MnO3 particles was about 22 nm, which uniformed growth in graphene sheet.Determination of contact angle indicated that the contact angle of glass substrate decreased and the hydrophilicity improved after treating with H2SO4 and APTES.The UV-Vis photocatalytic activity of the photocatalysts was evaluated by the degradation of diamine green B.La MnO3/graphene thin films had better photocatalytic ability than La MnO3 and Ti O2 films.The obtained k was 0.5627 and 0.3441 h–1 corresponding to La MnO3/graphene films and Ti O2 films, respectively.     

核心力量在山西高校篮球训练中的应用

通过研究高校篮球体能训练方法与篮球运动相关指标的关系,旨在加强核心力量训练理论在高校篮球训练中的应用。采用实验法测试,经过8周的核心力量训练后,两组队员身体素质相关指标较训练前有非常显著性变化(P0.01);实验组训练后负重深蹲、助跑摸高、变距折返跑较对照组有非常显著性变化,组内进行比较发现负重深蹲、绕杆跑、变距折返跑、助跑摸高训练后效果最明显,两组队员实验前、后2种投篮方式的命中率有非常显著性变化,但两组实验后定点跳投命中率没有显著性变化(P0.05)。核心力量训练能有效提高篮球运动员身体素质,对篮球运动员专项技术动作和不稳定投篮命中率有积极作用。     

公路维修养护中的典型预防性养护措施分析

公路的使用寿命相对较长,但是在使用过程中会出现一些问题,需做好公路的维修养护工作.传统的公路维修养护技术与材料无法满足公路维护需求,在道路养护工程中,预防性养护措施实施的主观性强,在措施选择上缺乏坚实的理论支撑.微表处和雾状封层是两种典型的预防性养护措施,本文对这两项措施的研究和应用成果进行总结归纳.调研内容包含了适用...