基质固相分散-超快速液相色谱测定山楂片中的4种苏丹红染料

采用基质固相分散-超快速液相色谱法测定了山楂片中的苏丹红染料,基质固相分散萃取的最佳条件为:0.45 g硅胶分散剂,6 mL乙酸乙酯作为洗脱剂,样品与分散剂质量比为1∶3。乙腈-水为流动相,流速:0.3 mL/min,进样量:10μL,柱温:30℃,梯度洗脱,4种苏丹红化合物回收率在86.1%~108.3%之间;RSD在2.3%~9.8%之间。测定苏丹红的线性范围为0.01~2.5 mg/kg(苏丹红Ⅰ,Ⅱ和Ⅲ),0.025~2.5 mg/kg(苏丹红Ⅳ),检出限为4.2~8.9μg/kg,检出限优于国标方法,可满足实际样品分析的要求。     

Kinetics and Thermodynamics of the Adsorption of Copper(Ⅱ) onto a New Fe-Si Adsorbent

A new kind of Fe-Si adsorbent was synthesized by iron oxide and diatomite after calcining and hydrothermal process. The influences of the initial Cu2+ concentration, p H and adsorption time on the Cu2+ removal efficiency were discussed. Three adsorption empirical kinetics equations and two thermodynamics equations were used to simulate the adsorption process. The microstructures of newly developed copper removal materials and properties of copper removal are characterized in details by SEM and EDS. Adsorption mechanism of the adsorbent was discussed. The suitable p H value for Cu2+ removal is 5.0 to 6.0 and the adsorption capacity increases with increasing the initial Cu2+ concentration. The adsorption kinetics of the adsorbent could be better described by pseudo second order kinetic model, whereas the adsorption isotherms highly conform to the Freundlich equation. The main crystalline phase of the adsorbent is Fe(Si O3) which can build porous structures conducive to the Cu2+ adsorption.     

马来酸酐接枝ABS对木粉/ABS复合材料性能的影响

采用压延-模压工艺制备木粉/丙烯腈-丁二烯-苯乙烯(ABS)复合材料,考察了相容剂马来酸酐接枝ABS(ABS-g-MAH)用量对木粉/ABS复合材料性能的影响。结果表明,相容剂ABS-g-MAH可有效改善木粉/ABS木塑复合材料的界面相容性,提高复合材料的力学性能、热分解温度和加工流动性,在ABS-g-MAH含量为8%(wt)时,复合材料力学性能达到最佳、材料的界面粘附性最好,但相容剂ABS-g-MAH的加入对复合材料的抗蠕变性没有改善作用。     

疯狂动力系统的一些性质

针对纤维映射为旋转的疯狂动力系统,比较系统的研究了它们的回复性、混合性、混沌性等基本的动力学性质.     

Determination of elastic,piezoelectric,and dielectric constants of an R:BaTiO₃ single crystal by Brillouin scattering

From the sound velocity measured using the Brillouin scattering technique,the elastic,piezoelectric,and dielectric constants of a high-quality monodomain tetragonal Rh:BaTiO3 single crystal are determined at room temperature.The elastic constants are in fairly good agreement with those of the BaTiO3 single crystal,measured previously by Brillouin scattering and the low-frequency equivalent circuit methods.However,their electromechanical properties are significantly different.Based on the sound propagation equations and these results,the directional dependence of the compressional modulus and the shear modulus of Rh:BaTiO3 in the(010) plane is investigated.Some properties of sound propagation and electromechanical coupling in the crystal are discussed.     

水稻花粉雄性不育光谱成像细胞学定量技术研究

在水稻雄性不育系花粉细胞败育程度鉴定方法上,传统的单纯显微图像分析方法或纯光谱分析方法存在定性、定位、定量和定时四位一体分析能力不足的问题.本文在普通荧光显微镜的基础上,研制出一种基于LCTF(Liquid Crystal Tunable Filter,液晶可调谐滤光器)的显微光谱成像分析系统,并将其引入到水稻花粉发育过程中的细胞学定量研究,初步建立起一套针对水稻花粉透射光光谱图像分析和荧光光谱图像分析新方法.与传统的纯光谱或纯图像分析方法相比,本分析方法具有独特的定性、定量、定位和定时四位一体的分析能力,其对水稻雄性不育系花粉败育程度的鉴定将更为准确.本方法对于其它植物和动物细胞的定量分析同样具有借鉴和推广意义.     

线阵CCD在声光调制实验中的应用

用线阵CCD代替可移动的光电二极管,改进了声光调制实验。将声光调制的入射光和衍射光投射在线阵CCD上,线阵CCD的信号输出由数字示波器显示,利用数字示波器的＂光标＂功能测出光斑的距离。改进后,使测量变得简单快捷,提高了实验效率,并减小了实验测量误差。     

“平面向量的数量积”二轮复习教学设计

1基本情况 1．1教学要求 在学生已掌握平面向量数量积涵义及基础知识的前提下,通过二轮复习使学生进一步强化对向量数量积定义的认识与理解,能熟练地运用向量数量积解决向量问题,从而掌握研究向量问题的方法与思路,培养学生分析问题解决问题的能力以及创新能力．     

半导体硅原材料及辅助材料中杂质的ICP－AES测定

本文采用电感耦合等离子体发射光谱对半导体硅原材料及辅助材料中的杂质分析进行了研究。着重研究了提升量对信背比的影响和残留硅对杂质元素的干扰影响，最后采用ＩＣＰ－ＡＥＳ对化学法提纯前的原料（石英砂）、拉制单晶用的辅助材料（硅粉）和拉制单晶过程中采用的石英坩埚中的杂质含量进行了分析。     

Pd-Fe/吸附树脂催化剂的结构及其对卤代芳香硝基化合物的催化加氢性能

Ｐｄ┐Ｆｅ／吸附树脂催化剂的结构及其对卤代芳香硝基化合物的催化加氢性能吴琼（湖北大学化学系，武汉４３００６２）李翔张曼征（湖北省化学研究所，武汉４３００７４）关键词负载型催化剂，钯，铁，吸附树脂，氯硝基苯，加氢卤代芳香硝基化合物的加氢产物卤芳胺广泛用...