不同晶粒大小HZSM-5载体对甲烷无氧芳构化反应的影响

将不同晶粒大小的HZSM－5做为甲烷无氧芳构化反应催化剂的载体，系统研究了不同晶粒大小HZSM－5载体对反应的影响，研究发现，不同晶粒大小HZSM－5担载Mo催化剂具有不同的催化反应性能，同一体系下合成的不同晶粒大小的HZSM－5，其催化剂的催化活性与HZSM－5的酸量成正比，进一步证实了载体HZSM－5在该反应中起到酸催化作用，对于酸量相近的HZSM－5，其粒度越小，催化性能越好，纳米级HZSM－5担载Mo催化剂，其反应性能优于微米级HZSM－5担载Mo催化剂，以纳米HZSM－5为载体的6％Mo/HZSM-5催化剂具有最佳的反应性能：反应60min时，甲烷转化率为15．45％，苯收率为6．01％。     

钛硅分子筛中铝杂质对其性能的影响

 以四丙基溴化铵为模板剂,以硅溶胶为硅源,采用水热合成法制备了不同铝杂质含量的钛硅分子筛,并系统考察了铝杂质对钛硅分子筛性能的影响．结果表明,原料中的铝杂质可促进钛硅分子筛晶化,但同时也引入了酸性中心;在丙烯环氧化反应中,铝杂质形成的酸性中心会催化环氧丙烷与溶剂的副反应;加入少量碱性添加物可抑制铝杂质的酸催化作用,提高环氧丙烷的选择性,但过量碱性添加物会使钛硅分子筛失活．     

固体电解质离子能带理论的余弦势计算

应用引入超位力定理 (HVT)和Hellmann Feynman定理 (HFT)的Rayleigh Schroding(R -S)微扰计算代数递推公式 ,近似计算了固体电解质周期骨架势为余弦势的E(q)～q公式 ,为定量研究离子能带结构提供了计算实例。     

1,2,4-三唑并[3,2-d][1,5]-苯并氧氮杂（艹/卓）化合物的合成

苯并二氢吡喃－４－酮的芳腙（１）衍生的偶氮基碳正离子（３）与腈发生１,３－偶极环加成反应,加成产物（４）通过「１,２」－迁移扩环重反应,形成新颖的三环系杂环化合物１,２,４－三唑并「３,２－ｄ」「１,５」－苯并氧氮杂Ｚｈｕｏ化合物５ａ－５ｋ。     

Temperature and strain sensitivities of surface and hybrid acoustic wave Brillouin scattering in optical microfibers

Temperature and strain sensitivities of surface acoustic wave (SAW) and hybrid acoustic wave (HAW) Brillouin scattering (BS) in 1 μm-1.3 μm diameter optical microfibers are simulated. In contrast to stimulated Brillouin scattering (SBS) from bulk acoustic wave in standard optical fiber, SAW and HAW BS, due to SAWs and HAWs induced by the coupling of longitudinal and shear waves and propagating along the surface and core of microfiber respectively, facilitate innovative detection in optical microfibers sensing. The highest temperature and strain sensitivities of the hybrid acoustic modes (HAMs) are 1.082 MHz/℃ and 0.0289 MHz/με, respectively, which is suitable for microfiber sensing application of high temperature and strain resolutions. Meanwhile, the temperature and strain sensitivities of the SAMs are less affected by fiber diameter changes, ranging from 0.05 MHz/℃/μ to 0.25 MHz/℃/μ and 1×10^-4 MHz/με/μ to 5×10^-4 MHz/με/μ, respectively. It can be found that that SAW BS for temperature and strain sensing would put less stress on manufacturing constraints for optical microfibers. Besides, the simultaneous sensing of temperature and strain can be realized by SAW and HAW BS, with temperature and strain errors as low as 0.30 ℃-0.34 ℃ and 14.47 με-16.25 με.     

Effect of Mo capping layers thickness on the perpendicular magnetic anisotropy in MgO/CoFeB based top magnetic tunnel junction structure

A detailed study of the magnetic characterizations of the top structure MgO/CoFeB/Mo is presented.The samples show strong perpendicular magnetic anisotropy(PMA) when the thickness of CoFeB is 0.9 nm and 1.1 nm.The saturation magnetic moment and interface anisotropy constant are 1566 emu/cm~3 and 3.75 erg/cm~2,respectively.The magnetic dead layer(MDL) is about 0.23 nm in this system.Furthermore,strong capping layer thickness dependence is also observed.The strong PMA of 1.1 nm CoFeB only exists in a Mo cap layer thickness window of 1.2-2 nm.To maintain PMA,the metal layer could not be too thin or thick in these multilayers.The oxidation and diffusion of the metal capping layer should be respectively responsibility for the degradation of PMA in these thin or thick metal capping layer samples.     

环境激励下Benchmark结构损伤识别的试验研究

针对结构健康监测中如何利用在线监测数据进行健康诊断的问题,基于时间序列分析提出了一种新的损伤识别方法.首先,获得结构健康状态的监测数据作为参考状态样本,对各数据样本建立ARMA模型并计算模型残差的方差.然后,将未知状态的监测数据作为待检状态样本,代入已建立的参考状态ARMA模型计算新的残差方差.计算发现,损伤前后两状态模型残差方差存在差异.因而,提出以残差方差之比作为损伤敏感特征,并建立基于F分布的假设检验来辨识结构的状态并预警损伤.最后,以Benchmark结构在环境激励下的试验为例,运用本文方法进行了损伤识别研究.结果表明,基于ARMA模型残差方差的损伤敏感特征可准确地区别结构的健康状态和损伤状态,具备结构在线实时损伤识别的应用价值.     

Strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe_2

The heavy fermion physics arises from the complex interplay of nearly localized 4f/5f electrons and itinerant bandlike ones, yielding heavy quasiparticles with an effective mass about 100 times(or more) of the bare electrons. Recently,experimental and theoretical investigations point out a localized and delocalized dual nature in actinide compounds, where itinerant quasiparticles account for the unconventional superconductivity in the vicinity of a magnetic instability. Here we report the strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe_2. The coupling is nearly antiferromagnetic. As embedded in the ferromagnetic matrix of localized 5f moments below T_C≈ 52 K, this coupling leads to short-range dynamic correlations of heavy quasiparticles, characterized by fluctuations of magnetic clusters. Those cluster-like spins of itinerant quasiparticles show a broad hump of magnetization at T_X ≈ 28 K,which is typical for the spin-glass freezing. Thus, our results present the direct observation of itinerant quasiparticles coexisting with localized 5f moments by conventional magnetic measurements, providing a new route into the coexistence between ferromagnetism and superconductivity in heavy fermion systems.     

水热法制备ZnO/石墨烯复合材料及其电化学性能研究

采用水热法制备ZnO/石墨烯复合材料,研究了ZnO、石墨烯不同配比与其电化学性能的关系.通过X射线衍射(XRD)、扫描电镜(SEM)、恒电流充放电、循环伏安法和交流阻抗等测试方法对复合材料结构、形貌及电化学性能进行表征,并通过电池解扣结合SEM和EDS进一步研究电极充放电前后的形貌及组分变化.结果表明,ZnO与石墨烯质量比为1∶1时电化学性能最好,在50 mA/g电流密度下首次可逆比容量高达680 mAh/g,且循环100次之后仍保持相对最高.电池解扣分析证明电极材料在充放电过程中表面会产生微裂纹影响其电化学性能.     

一种可信软件栈的兼容性改进方案

针对目前可信软件栈(TSS)规范的应用兼容性问题,提出了TSS命令改进方案,使之能够支持多种密码算法的可信平台模块.通过对TSS体系结构和组成的分析,重点描述了可信服务提供层(TSP)和可信核心服务层(TCS)的功能和接口特点,并以典型的可信平台模块(TPM)命令为例,通过句柄映射和函数输入输出参数的调整,增加TCS命令解释功能,改进TSS兼容性,使得TSS在不修改上层应用的情况下能兼容多种密码方案,达到应用兼容的目标.