基于聚苯胺-镍酞菁多孔渗透薄膜的氨气传感器

利用磺化镍酞菁(NiTSPc)对苯胺(PANI)聚合的催化作用,通过简单的电聚合方法在叉指金电极(IAE)表面合成了PANI/NiTSPc多孔渗透膜.利用扫描电子显微镜(SEM)、原子力显微镜(AFM)、能量色散图谱(EDS)和拉曼光谱对PANI/NiTSPc多孔膜进行表征.在室温下,采用基于PANI/NiTSPc多孔膜制备的传感器对不同浓度(3.8~1900 mg/m~3)的NH_3进行了检测.结果表明,对于76 mg/m~3的NH_3,传感器的灵敏度为2.75,响应时间为10 s,且该传感器具有恢复时间短、重复性及稳定性良好等优点.所制备的PANI/NiTSPc薄膜传感器在NH3检测及电子鼻的应用中具有巨大潜力.     

突破教学难点方法刍议

本文根据教学经验, 举例说明几类突破教学难点的方法     

Fresnel波带板编码成像技术

 介绍了Fresnel波带板编码成像原理,并设计出高空间分辨率的Fresnel波带板编码相机,用双孔可见光源对编码相机的成像进行了实验研究,表明该编码相机可以真实地还原源区的空间大小和形状。     

利用多项式展开法对软X光点光源透射光栅测量谱解谱

 针对软X光点光源的通过透射衍射光栅获得的测量谱,提出一种新的解谱方法进行解谱。与以往的解谱方法不同,该方法无需选择截止波长。使用该方法对ICF实验中的典型软X光源的透射光栅测量谱进行了解谱,并与以往的解谱方法获得的结果进行比较,取得了满意的结果。     

On buckling of cantilever rectangular plates under symmetrical edge loading

The stability of cantilever rectangular plates under the symmetrical edge loading will be studied in this paper by lite varialional calculus. We are going to find out the minimum critical loading for cantilever rectangular plates subjected to various edge loadings symmetrically on a pair of opposite free edges. We’ll discuss the least critical loadings when the buckling of rectangular plates acted on bv a pair of concentrated forces, uniformly distributed loads, locally uniform distributed loads, distributed loads in the form of triangle and a pair of concentrated couples occur respectively.     

Lateral instability of rectangular plates

This paper investigates the problems of lateral buckling of rectangular plates. In the text we discuss the minimum critical load of the lateral buckling occurring on under a concentrated force, uniformly distributed load and the concentrated couples, respectively. The energy method is used in this article.     

闭合圆柱壳在冲击荷载下的动力计算

本文讨论闭合圆柱形壳体在冲击荷载作用下的动力计算.文中分析冲击过程各阶段的动量及能量的变化,并计入冲击物和被冲击的闭合圆柱壳系统质量的影响;用相当质量法将整个圆柱形壳体的分布质量转化为只有一个集中的“相当质量”,从而导出闭合圆柱形壳体在冲击力作用下的动力因数.本文的特点是具有实用价值,计算比较简便.     

POWDER NEUTRON DIFFRACTION STUDIES OF THE CRYSTALLOGRAPHIC AND MAGNETIC STRUCTURE OF Ho2Fe9Ga8 and Ho2Fe9Ga6AI2

The crystallographic and magnetic structures of Ho₂Fe₉Ga₈ and Ho₂Fe₉Ga₆AI₂ were studied by powder neutron diffraction at room temperature. The atom fractional occupancies of Ga and Al and the magnetic moments of Ho and Fe were obtained by using Rietveld analysis program. The magnetic structures of the two samples show an easy-axis anisotropy, with the Fe magnetic moment being ferrimagneticlly coupled to those of Ho.     

The bending stability and vibrations of cantilever rectangular plates

This paper discusses the problems of the bending, stability and vibrations of cantilever rectangular plates by means of the variational method. In the text a good many calculating examples are illustrated.