Study of Heat Transport in Bénard-Darcy Convection with g-Jitter and Thermo-Mechanical Anisotropy in Variable Viscosity Liquids

The effects of temperature-dependent viscosity, gravity modulation and thermo-mechanical anisotropies on heat transport in a low-porosity medium are studied using the Ginzburg–Landau model. The effect of gravity modulation is to decrease the Nusselt number, Nu and variable viscosity leads to increase in Nu. The thermo-mechanical anisotropies have opposite effect on Nu with thermal anisotropy decreasing the heat transport.     

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     

A Note on the Legendre Series Solution of the Biharmonic Equation for Cylindrical Problems

The solution of cylindrical problems is addressed. A series solution is considered of the biharmonic equation, in which the series terms of the stress function Φ are expressions based upon Legendre polynomials and logarithmically singular functions. An explicit form of a polynomial supplementing each logarithmically singular part of the series solution is obtained.     

An Incompressible Fluid in a Weakly Deformable Shell. Part I: Analysis of the Model

We consider the flow of a viscous incompressible fluid in a pipe when the boundary is a deformable shell of Naghdi type. We prove that the corresponding system of partial differential equations has a solution when the deformation of the shell is smooth and small enough. We propose an algorithm that uncouples the unknowns and prove its convergence.     

Nonlinear analysis of laser droplet generation by means of 0–1 test for chaos

We apply the recently improved version of the 0–1 test for chaos to real experimental time series of laser droplet generation process. In particular two marginal regimes of dripping are considered: spontaneous and forced dripping. The outcomes of the test reveal that both spontaneous and forced dripping time series can be characterized as chaotic, which coincides with the previous analysis based on nonlinear time series analysis.     

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．     

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。