有机化学课程思政教育的探索

有机化学是理工科的基础主干课,也是高校课程思政教育的主阵地,其特点是理论深奥、反应机理复杂,学生理解不易。本文以“三核一教”为主线,从诺贝尔化学奖、有机化学史、化学热点问题等几方面深度挖掘有机化学课程中的思政元素,将思想引领自然融入到有机化学的教学中,进而贯彻教书育人的原则,提升课堂教学质量,并对实际教学效果进行分析。     

Crystal structure,morphology and luminescent properties of rare earth ion-doped SrHPO4 nanomaterials

Undoped and rare earth ions(Eu3+, Ce3+, Tb3+) doped β-Sr HPO4 nanomaterials were successfully prepared by a facile hydrothermal method. The crystal structure, morphology and luminescent properties were characterized by X-ray powder diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), photoluminescence(PL) spectra and luminescence decay curves. The results indicated that the undoped and rare earth ions doped Sr HPO4 nanomaterials(the doping concentration was not above 7%) were well crystallized, with the same crystal structure(β-Sr HPO4). Nevertheless, the doping of rare earth ions could lead to the changing of morphology from nanoflakes to nanocrystals. Under the excitation of UV light, rare earth ions(Eu3+, Ce3+, Tb3+) doped β-Sr HPO4 nanocrystals exhibited the characteristic emission of Eu3+, Ce3+ and Tb3+ ions, respectively. The luminescence decay curves of β-Sr HPO4:Eu3+ and β-Sr HPO4:Ce3+,Tb3+ nanocrystals conformed to the double exponential fluorescence decay, and the average lifetimes were 1.14 and 4.12 ms, respectively. The luminescence decay curve of β-Sr HPO4:Ce3+ was fitted into a single exponential function, and the lifetime was about 0.78 ns.     

地心直角坐标和大地坐标转换算法研究

在GPS导航系统中，坐标在不同坐标系中的转换算法对定位精度有着重要的影响。文中在Bowring直接转换算法的基础上，针对其对高程的敏感性问题，提出了一种修正算法。采用二维线性插值法对不同高程下的坐标转换结果进行校正，提高了坐标换算得的稳定性和精度。仿真结果验证了该算法的正确性。     

浅谈禹州市学校防雷工作现状与防御对策

本文结合禹州市目前的学校防雷工作现状，总结分析了近年来禹州市在学校防雷工作的主要做法、经验以及当前工作中存在的问题，提出了今后建立健全防雷减灾工作责任制。二是制定落实应急措施加强学校防雷工作的思路及措施：进一步消除了学校防雷设施存在隐患，确保了学校师生及教学设施的安全。     

Synthesis and photoluminescent properties of water-soluble TbF_3 nanoparticles

Monodispersed and water-soluble TbF3 nanoparticles were synthesized at a relatively low temperature in aqueous solution using citric acid as an additive,and characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM),Fourier transform infrared spectra(FTIR),photoluminescence(PL) spectra and lifetime.The as-prepared TbF3 nanoparticles had orthorhombic structure and were composed of monodispersed spherical particles with an average particle size of 50 nm.The excitation spectrum...     

嘉陵江苛特大桥裂缝治理和维修加固方法研究

介绍了嘉陵江上某特大桥原状及病害情况，分析了裂缝类型及产生原因，针对裂缝成因提出不同的处理方法，对病害中预制构件与现浇砼之间存在的脱粘现象，讨论了解决的办法，最后介绍了拱桥的加固措施，为同类桥梁的病害治理提供了成功的经验。     

新旧混凝土结合面粘结强度计算方法研究

对不同界面处理方法的新旧混凝土组合体试件,进行了抗剪承载力的试验研究。在试验结果的基础上,结合理论分析,给出了新旧混凝土结合面粘结力的计算方法。     

某钢筋混凝土拱桥的健康检测及安全评估

某钢筋混凝土拱桥使用近30年,已不确定结构是否处于安全使用状态。通过无损检测和现场静力荷载试验,对整桥进行全面健康检测,安全评估分析认为该桥安全储备不足,需要进行维修加固。     

桁架拱桥的安全评估

某跨径为64.4 m钢筋混凝土桁架拱桥,位于水库淹没区,水库蓄水后该桥拱脚及以上3.0 m内的构件将被淹没于水中。为确定该桥的损伤情况和蓄水后被淹没构件的工作状态,对整桥进行全面健康检测,并进行有限元结构计算分析,考虑漂流物撞击的影响,进而对结构安全做出评价。