Bending of uniformly loaded rectangular plates with two adjacent edges clamped, one edge simply supported and the other edge free

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环氧/氟碳复合涂层的制备及其耐磨、防腐性能

为提高氟碳树脂涂层在金属基体上的疏水性和耐磨、防腐性能,采用简单共混方法制备了环氧树脂（EP）改性氟碳树脂（FEVE）复合涂层EP/FEVE。采用傅里叶变换红外光谱（FT-IR）确定复合涂层的组成和结构,并基于干摩擦和模拟海水（3.5%NaCl溶液）摩擦测试与电化学阻抗谱（EIS）测试研究了复合涂层的耐磨、防腐性能及机理。结果表明,与FEVE相比,当EP质量为FEVE质量的10%时,复合涂层在干摩擦和模拟海水摩擦条件下的耐磨性能分别提高69.8%和66.1%,涂层破损时间延长12.2倍;在3.5%NaCl溶液中浸泡15 d后,复合涂层阻抗模量较FEVE高近3个数量级。机理研究表明,EP的分子链与FEVE分子链段通过氢键穿插分布形成了交联网络结构,并借助EP分子链中刚性结构的强化作用与活性基团的活化作用,使EP/FEVE复合涂层在耐磨、防腐、力学性能等方面表现出综合性能优势。     

Morphological and Physicochemical Properties of Water Chestnut Starches: a Comparative Analysis of Three Varieties

Water chestnut(Eleocharis dulcis) is widely cultivated in many countries for its edible and starchy corms. In this study, starches were separated from Guangxi biqi, Hubei biqi and Anhui biqi, and the morphological and physicochemical characteristics of the starches were systematically investigated. There were significant differences in granule size, total starch and amylose contents among starches from the three water chestnuts which present similar X-ray diffraction patterns and Fourier transform infrared spectroscopy. The starch of Guangxi biqi exhibited higher swelling power and solubility than that of Hubei biqi and Anhui biqi. Thermal and pasting properties of starch were different among the three water chestnuts. When hydrolyzed by porcine pancreatic α-amylase(PPA), starches from Hubei biqi and Anhui biqi had higher hydrolysis degree. The starches from the three water chestnut varieties differed significantly in morphological and physicochemical properties, and these studies may provide useful information for future exploitation and application of water chestnut starch in food and non-food industries.     

膜分离天然气脱水蒸汽技术的研究现状

天然气脱水蒸汽是天然气净化过程中的必要环节,选择合适的脱水蒸汽技术和工艺至关重要。本文首先简要概述了新兴的膜分离天然气脱水蒸汽方法的特点,然后介绍了膜分离性能的表征参数及测试、膜组件设计及操作条件的选择,重点介绍了近年来膜分离甲烷脱水蒸汽技术中的聚合物膜材料、沸石分子筛膜材料,最后展望了金属有机骨架材料的应用潜力以及天然气脱水蒸汽技术未来的发展趋势。     

棱镜光谱线弯曲的分析

分析了三棱镜光谱线弯曲的原因和弯曲的方向。     

A CLIMATIC OSCILLATION MODEL WITH CLOUDINESS AS IMPLICIT VARIABLE

Based on the Tang and Zhong's paper, a new radiation parameterization scheme and a parameterized relation between surface temperature, atmospheric temperature and cloudiness are introduced in this paper. The model is constructed with linear equations and the cloudiness is treated as an implicit variable. The oscillation characteristics of the underlying surface and atmospheric system are discussed for three typical underlying surface conditions. Better results are shown in this improved model than those described in Ref. [1].     

CCD探测器在测量金属丝线膨胀系数中的应用

利用CCD探测器分别测出常温和高温下金属丝衍射花样相邻暗纹的间距，用光学高温计测出加热时的温度值，从而求出线膨胀系数。     

不同醇对猪心线粒体F_1-ATPase和H~+-ATPase复合体构象的影响——圆二色性光谱研究

本文测定了ATPase复合体和F_1-ATPase在低浓度甲、乙、正丙、异丙、叔丁醇中的远紫外圆二色(CD)谱。结果表明:5—20%甲醇、5—10%乙醇、5%正丙醇、5—10%异丙醇和叔丁醇使F_1—ATPase的CD谱双负峰变大,F_1的α-螺旋量增加,20%乙醇,10—20%正丙醇、20%异丙醇则使F_1的CD双负峰明显变小,F_1的α-螺旋量显著减少。而外加5—20%的醇对ATPase复合体的远紫外CD谱影响不大,计算出的α-螺旋量也无明显变化。显然,与游离的F_1-ATPase相比,ATPase复合体中疏水蛋白(F_0)及部分磷脂的存在,使其构象呈现了醇稳定性。     

一种测声速的新装置

声速的测定是物理学中一个基础实验, 就目前而言已有多种测定方法可以供我们选择, 本文中介绍一 种测声速的简单新装置, 本装置通过声波的反射、 叠加, 利用钢管中液体的振动来测定声音在液体中的传播速度, 该 实验操作简单, 实验仪器精度高, 可行性高, 可以在物理教学中推广使用     

机械球磨制备Sm-Fe固溶体合金材料

利用高能机械球磨Fe、Sm3H7的方法制备Sm-Fe固溶体,利用X射线衍射仪对合金相及微观结构变化进行分析。实验结果发现：通过高能球磨,样品发生了固溶形式的相变过程,得到了Sm-Fe固溶体。