Turing structures and stability for the 1-D Lengyel–Epstein system

This paper continues the analysis on the Lengyel–Epstein reaction- diffusion system of the chlorite-iodide-malonic acid-starch (CIMA) reaction for the rich Turing structures. The steady state structures, especially the double bifurcation one, and their stability and multiplicity are studied by the use of Lyapunov–Schmidt reduction technique and singularity theory. Numerical simulations are presented to support our theoretical studies. The results show that the richer stationary Turing patterns heavily rely both on the size of the reactor and on the effective diffusion rate in the CIMA reaction.     

Synthesis and characterization of phenol‐based biaryl proton conducting polymers

Biaryl hydroxy polymers with orthogonal disposition of proton transporting ? OH moieties have been synthesized via conventional free radical polymerization. The polymers are characterized for their thermal stability and proton conductivity, and the results are compared with the corresponding styrenic hydroxy polymers. The orthogonal disposition of ? OH moieties in biaryl polymers does result in lower E_a for proton transport. However, the lower E_a values in biaryl polymers did not translate into a net increase in proton conductivity. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012     

AMS theme collection on “Mechanics of Nanomaterials”

正This themed collection on Mechanics of Nanomaterials consists of five papers, including one review article. With our ability to control and manipulate matter at atomic level developed with the invention of atomic force microscope since 1980s, novel materials with feature size ranged from a few nanometer to hundreds of nanometer     

过渡金属氢化物和聚集双键化合物反应的研究Ⅲ.用ESR方法考察二茂锆氢化物与RNCS的反应机理

本文用ESR方法考察了Cp₂ZrH) Cl与RNCSR=C₆H₅,c-C₆H₁₁,n-C₄H₉)的反应的过程,结果表明,在这类反应过程中,Zr-H键发生均裂,中心金属锆经过+4-→+3-→+4的价态变化,反应通过自由基机理进行.     

a-CdSe超快光电探测器特性研究

本文报道淀积条件对非晶态硒化镉(a-CdSe)薄膜微区结构的影响,并对利用a-CdSe为光敏介质的超快光电探测器的特性进行了比较深入的测试研究。     

线阵扫描超声相关合成成像方法与实验

本文讨论了改进的医用B超线阵扫描探头在工业无损检测中的应用．在合成孔径聚焦技术（SAFT）基础上提出了改进方法，在探元响应带宽较窄的情况下可获得较高信噪比的成像结果．文中介绍了成像系统，实验方法，并给出了一些实验结果．     

石油醚在流体静高压下的超声声速、衰减、密度和绝热压缩系数

 专门设计了用脉冲-回波-重合法在不同静水压下测量液体声速的装置，并对石油醚在0.1~650 MPa流体静压力范围内测量了其超声声速和衰减系数。还通过测量体积压缩量和质量得到石油醚密度ρ随流体静压力的变化。最后，给出了石油醚的绝热压缩系数β与流体静压力的关系。     

3-methyl-4-metroxy-4'-nitrostilbene (MMONS) Crystal Growth and Studies of It

３－ｍｅｔｈｙｌ－４－ｍｅｔｒｏｘｙ－４＇－ｎｉｔｒｏｓｔｉｌｂｅｎｅ（ＭＭＯＮＳ）ＣｒｙｓｔａｌＧｒｏｗｔｈａｎｄＳｔｕｄｉｅｓｏｆＩｔｓＳｅｃｏｎｄＮｏｎｌｉｎｅａｒＯｐｔｉｃａｌＰｒｏｐｅｒｔｉｅｓ￥ＣＡＯＹａｎｇ；ＺＨＵＺｈｉｄｏｎｇ；ＨＵＡ...     

二价铕激活的Ba1-xCaxFCl体系及其发光

本文研究了Ba1-xCaxFCl:Eu体系及其发光。从差热分析相图和X射线衍射分析发现在Ba1-xCaxFCl体系中存在着Ba0.5Ca0.5FCl这个物相。Ba1-xCaxFCl:Eu体系在X射线激发下的发光包含一个3630Å的锐峰和一宽带发射峰,其峰值由BaFCl:Eu的3868Å到CaFCl:Eu的4640Å,阴极射线和紫外线激发下的发射光谱与此类似。在X射线激发下,Ba0.8Ca0.2FCl:Eu的发光最强,而在阴极射线激发下,CaFCl:Eu的发光强度最大,在紫外线激发下,Ba1-xCaxFCl:Eu的发光强度校弱。在以上三种激发情况下,Ba0.5Ca0.5FCl:Eu的发光都比较弱。     

非晶半导体光致发光的温度依赖关系

研究了a-Si:H,a-Si:H,F,a-Si:H,Cl以及a-Si:H,Cl,O等非晶硅薄膜光致发光的温度依赖关系。测量了各种样品的无辐射跃迁激活能ε,并试图寻求激活能ε与样品的制备条件和结构之间的关系;同时从发光强度的温度相关性确定了带尾态密度分布参数T0,以及T0与发光光谱形状之间的关系。并将实验结果与瞬态光电导的数据进行了比较。