咪唑功能化聚苯乙烯包覆硅胶微球分离富集——火焰原子吸收光谱法测定痕量银

制备了咪唑功能化聚苯乙烯包覆硅胶微球并用其填充微柱,建立了微柱分离富集--火焰原子吸收光谱法测定痕量银的方法.研究了填充微柱对Ag(I)的吸附性能及影响吸附的因素,用酸性硫脲作洗脱剂,以峰面积检测,测定Ag(I)的线性范围为0.010-0.50μg/mL,相对标准偏差为2.5%(n=3),检出限为0.002μg/mL,灵敏度提高20倍,填充微柱可重复利用.     

濒危植物长序榆的FTIR分析及与土壤元素氮的相关性研究

应用傅里叶变换红外光谱(FTIR)法测定了8个样地长序榆的根、茎、皮、叶的红外光谱,并对这些红外光谱与土壤元素氮进行了相关分析。结果表明,根、茎、皮、叶的红外光谱存在一定差异,其 组织器官化学成分含量和土壤氮元素之间存在不同程度的相关关系,茎中化学成分含量和全氮都呈显著正相关(p<0.05);皮在3 365 cm-1波数时的化学成分含量和全氮呈显著正相关,根和叶的化学成分含量与全氮呈低度相关。土壤速效氮和长序榆根、茎、皮、叶的化学成分含量之间也存在一定程度的相关性,但相关性比全氮弱的多,均未达到统计学意义上的“显著水平”。说明土壤全氮 的变化对长序榆植物的化学成分具有一定的影响,速效氮的影响则相对较低。     

Syntheses,Crystal Structures and Antibacterial Activities of 5-Chloro-3-methyl-1-phenyl-1H-pyrazole-4-carboxylic Acid and Its Copper(Ⅱ) Compound

The title compounds 5-chloro-3-methyl-1-phenyl-1H-pyrazole-4-carboxylic acid(C11H9Cl N2O2, HL)(1) and [Cu(L)2(H2O)](2) were prepared and structurally characterized by elemental analysis, IR and single-crystal X-ray diffraction. Compound 1(C11H9Cl N2O2) crystallizes in the monoclinic system, space group P21/n with a = 7.249(3), b = 20.515(10), c = 7.249(3),β= 96.30°, V = 1071.6(9) ?3, Z = 4, Mr = 236.65, Dc = 1.467 g/cm3, F(000) = 488, GOOF = 1.029, μ= 0.341 mm-1, the final R = 0.0736 and w R = 0.1966 for 1500 observed reflections with I 2σ(I). Compound 2(C22H18Cl2Cu N4O5) crystallizes in the monoclinic system, space group P21/c with a = 7.2931(6), b = 24.548(2), c = 13.2726(11), β= 99.4040(10)°, V = 2344.2(3) ?3, Z = 4, Mr = 552.84, Dc = 1.566 g/cm3, F(000) = 1124, GOOF = 1.050, μ= 1.201 mm-1, the final R = 0.0376 and w R = 0.1000 for 3626 observed reflections with I 2σ(I). 1 and 2 are connected through hydrogen bonding interactions to generate 2D and 3D supramolecular structures, respectively. Moreover, the preliminary antibacterial activities of 1 and 2 against the gram positive bacteria(S. aureus, C. albicans and B. subtilis) and gram negative bacteria(E. coli and P. aeruginosa) have been tested by using the microdilution method, and the results indicate that 2 is more active than 1 against the tested bacteria.     

一种具有噪声估计能力的图像恢复正则化方法

利用小波为正则化方法提供了一种估计噪声能量的机制，根据估计得到的噪声能量，再利用经典正则化方法求解正则化参数，从而得到正则化解，实验结果表明估计噪声能量机制的正则化方法，在噪声能量和原图像能量信息未知的情况下，具有较快的计算程度和较好的恢复能力。     

羧基苯偶氮基杯[8]芳烃衍生物的合成及表征

以邻、间或对氨基苯甲酸和杯[8]芳烃为原料，经重氮化一偶联反应合成了新型有色邻、间或对羰基苯偶氮基杯[8]芳烃，产物的结构经元素分析，IR，UV－Vis和1H NMR表征，并研究了它们的生色原理和光谱性能，实验结果表明它们是一类新型指示剂和具有新型配位空腔的主体分子。     

DYNAMIC ANALYSIS OF AN AUTOMATIC WASHING MACHINE WITH A HYDRAULIC BALANCER

A mathematical model of a hydraulic balancer in steady state condition was derived from a whirling model of a vertical axis washing machine, with the aim of implementing a dynamic analysis of an automatic washing machine during spin drying mode. The centrifugal force acting on the hydraulic balancer depends on the centroidal distance of the fluid in the hydraulic balancer, and the centroidal distance is a function of an eccentricity of the geometric center of the hydraulic balancer from the axis of rotation. A mathematical model of the hydraulic balancer in steady state is validated by the experimental result of the centrifugal force. Experiments were performed on a washing machine during spin drying mode, and results were compared with the simulation result. The parameters affecting the vibration of the washing machine were investigated by the parameter study.     

LaNi5的硫化物中毒及其再生的表面研究

本文概括了氢气中的硫化物(如H₂S,SO₂和CS₂)对LaNi₅的表面中毒和再生。AES,XPS的分析表明,三种硫化物的中毒性质不同:H₂S中毒产生La₂S₃和NiS这样的表面化合物;SO₂和CS₂中毒分别发生化学吸附和物理吸附。此外,从Ni(2P_3/2)谱峰强度变化,表明了在LaNi关键词：     

脂肪酶在聚乙二醇二丙烯酸酯交联聚合物上的固定化

研究了聚乙二醇二丙烯酸酯(PEGDA)作为预聚物,三羟甲基丙烷三丙烯酸酯(TMPTA)为交联剂,紫外光引发交联聚合,实现对脂肪酶固定化的方法.结果表明所制备的固定化酶与游离酶相比催化活性提高了8倍以上,且其稳定性及对环境的适应性也大大提高,在95%的乙醇中浸泡5 d后,其催化活力仍有96%之多.     

探索性问题设计方法八种

给出了设计探索性问题的八种方法