盐封后碳化钼电催化剂的制备及其氢析出性能（英文）

碳化钼具有低廉的价格、优越的催化性能以及良好的稳定性而被人们认为是极好的可以替代Pt等贵金属的氢析出反应（HER）催化剂。本工作采用钼酸钠和2,6-二氨基吡啶为反应原料,之后不断进行...supported by the National Key Research and Development Program of China(2017YFA0206500);; the National Natural Science Foundation of China(21773198,U1705253)~

连续陶瓷纤维的制备、结构、性能和应用:研究现状及发展方向

连续陶瓷纤维是纤维增强陶瓷基复合材料的增强体,对提高陶瓷基复合材料的强度和韧性起关键作用,高损伤容限和高强度陶瓷纤维是阻止裂纹扩展实现陶瓷基复合材料强韧化的保障。本文对碳化硅、氮化硅、氮化硼、氧化铝和氧化锆等几种陶瓷纤维的制备方法、结构、性能和应用等方面进行了全面的综述,指出了今后的发展方向,期望为未来陶瓷纤维的研究、开发及应用提供参考。国家高技术研究发展计划(863)(2003AA305630);;国家自然科学基金(51472144);;山东省科技重大专项(2015ZDZX11003);;山东省青年学者未来计划(2016WLJH27

碎石弹

本实用新型碎石弹是对大块岩石二次破碎用的碎石弹，它是由雷管(1)、炸药(2)、碎渣(3)、外壳(4)和圆柱形凹槽(5)组成。碎石弹的外壳(4)可以用塑料、硬纸板、油毛毡等廉价材料制作，炸药(2)可以是猛炸药和其它廉价的氧化物或惰性物混合而成，碎渣(3)则是为了增加碎石弹的冲击力，总之本实用新型具有结构简单，造价低廉，使用方便，炸药能量利用率高的优点

A Counterexample of the Approximate PoincaréMap

在WIggInS S.所著的书《glObAl bIfurCATIOnS And CHAOS》的第三章中分别讨论了在双曲奇点附近庞加莱映射与其线性逼近的误差,以及它们的导数之间的误差,即其证明了:P0-Pl0=Ο(ε2)与dP0-dPl0=O(ε2).针对该本书中提出来的庞卡莱映射线性逼近理论,构造出一个反例,通过利用等价关系和不等式等一些技巧,不仅说明了书中的上述两个逼近误差是错误的,而且指出了书中用来证明该线性逼近理论的引理都是不正确的.Wiggins S.,in his book " Global Bifurcations and Chaos",discussed the error between the Poincarémap and its linear approximation,and also the error between the derivations of those maps near the hyperbolic singular point in Chapter 3,respectively.In other words,he proved the conclusions: P0-PL0=O(ε2)and DP0-DPL0=O(ε2).In this paper,we present a counterexample in allusion to the linear approximation of Poincarémap in this book.Through utilizing some skills of the equivalence relation and some inequalities,not only do we illustrate the two approximation errors mentioned above are incorrect,but also the lemma,which is used to prove the theory of linear approximation,appears invalid

The Preparation Method and Methanol Electrocatalytic Activity of Ternary PtRhSn/GN

本研究通过多元醇还原法制备了石墨烯(grAPHEnE,gn)负载的PT及PT基多元催化剂:PT/gn、PTrH/gn、PTSn/gn、PTrHSn/gn.X射线粉末衍射(Xrd)和透射电镜(TEM)结果表明,所制备的催化剂分布均匀,PT/gn和PTrH/gn具有立方体形状,PTSn/gn呈现三维网络形貌,PTrHSn/gn则为立方体延伸的三维网络.循环伏安研究表明,rH的加入提升了甲醇电催化氧化的活性,而Sn的加入明显降低了甲醇在PT上的起始氧化电位,负移达到106MV.电化学原位红外光谱研究进一步证明,rH和Sn的加入使得PT基催化剂对甲醇氧化的起始氧化电位负移;rH的加入使得CO谱峰强度增大,而Sn的加入明显降低了CO谱峰强度.三元催化剂PTrHSn/gn很好地综合了rH和Sn的电子效应及协同效应特点,相比于PT/gn催化剂,起始氧化电位负移60MV,且催化活性达到其1.57倍,表明该三元催化剂在直接甲醇燃料电池中将会有较好的应用前景.Pt/GN,PtRh/GN,PtSn/GN and PtRhSn/GN catalysts were synthesized through a polyol method.The results of transmission electron microscopy(TEM)and X-ray diffraction(XRD)indicated that the as-synthesized catalysts were uniformly dispersed on the graphene(GN)surface.Both Pt/GN and PtRh/GN were composed of homogeneous cubics,while PtSn/GN showed threedimensional network morphology(TDNM)and PtRhSn/GN presented a cubic extended TDNM.Electrochemical cyclic voltammetric(CV)result revealed that the additive element Rh was able to promote the activity,while Sn lowered the onset potential as much as106 mV compared with Pt/GN catalyst for methanol electro-oxidation.In-situ electrochemical Fourier transform infrared spectroscopy(FT-IR)results showed that Rh and Sn could lower the onset potential,and Sn declined the CO peak intensity while Rh increased it.The electronic effect and synergistic effect between the additive element Rh,Sn and Pt make ternary PtRhSn/GN a promising lowPt catalyst for direct methanol fuel cells,which shows a peak current of 1.57 times as much and the onset potential shifting negatively by 60 mV compared with Pt/GN.国家自然科学基金(21273180;21361140374;21321062

Al及Al合金粉末颗粒表面氧化膜厚度对爆炸烧结体质量的影响

本文借助光学显微镜、扫描电镜分析研究了水雾化、氮气雾化al粉和超声氩气雾化Al-Li合金粉爆炸烧结体的显微结构, 结果表明: 只有Al及Al合金粉的表面氧化膜厚度小于30nm时, 才可以得到性质优异的爆炸烧结体