对辣椒色素某些性能的测试

对辣椒色素某些性能的测试陈连文（河北经贸大学轻工系石家庄０５００６１）刘敬兰（河北师范大学实验中心石家庄０５００１６）关键词分离辣椒色素测定红辣椒属茄科，辣椒属（ＣａｐｓｉｃｕｍｆｒｕｔｅｓｃｅｎｓＬ．），我国各地均有栽培，品种多，资源丰富。内服有开...     

关于图的同构判定方法的探讨

对于两图的同构的判定方法进行较深入的探讨,给出判定两图同构和判定两图不同构的几种方法,并对其判定方法的优劣进行比较.     

原子吸收和原子荧光光谱法测定茶园土壤中的微量元素

采用微波消解-火焰原子吸收和原子荧光光谱法同时测定了贵州梵净山茶园土壤中14种微量元素含量,方法简单、准确、迅速,有助于全面、迅速地了解茶园土壤中微量元素的含量,对于特色茶叶品质鉴定和指导合理科学栽培茶树等方面有重要意义.     

(X+K)mod 2~n运算和XK运算异或差值的概率分析及其应用

对(X+K)mod 2~n运算和X⊕K运算异或差值函数的概率分布规律进行了研究,并基于穷举攻击中大概率优先选取原则,给出了一个解决(X+K)mod 2~n和X⊕K等价问题的计算复杂度为O(n)的算法,基于此对Hawkes等人针对SNOW1.0的猜测决定攻击进行了改进,使其数据量由O(2~(95))降为O(2~(90)),而计算复杂度由O(2~(224))略微提高到O(2~(224.482)).     

1.5次微分吸附阴极溶出伏安法测定毛地黄毒苷及其电极过程的探讨

毛地黄毒苷是治疗心脏病的有效药物,它在汞电极上能吸附还原.以1.5次微分吸附阴极溶出伏安法测定检出限达3.2×10~(-10)mol/L.吸附溶出响应依赖于试液浓度、富集电位、富集时间、介质、溶液pH、温度及扫速等因素.不同富集时间,不同浓度范围内.浓度与峰高有良好的线性关系.毒苷的常规循环伏安图上出现两对氧化还原峰,电极反应相似于α,β不饱和羰基的1,2和1,4加成,电极反应可逆.毒苷在汞电极上的饱和吸附量为3.54×10~(-11)mol/cm~2.     

The Structural Determination of the Ozonides and Their Reaction with Stabilizel Phosphorus Ylides

The ozonides reacted with stabilized phosphorus ylides to give the α,β-unsaturated carbonylcompounds in high yield. The Z/E ratio is dependent on the substituent of the ozonide. Their possiblemechanism was described.     

Surface-modified CdS quantum dots as luminescent probes for sulfadiazine determination

A novel, sensitive and convenient determine technology based on the quenching of the fluorescence intensity of functionalized CdS quantum dots by sulfadiazine was proposed. Luminescent CdS semiconductor quantum dots (QDs) modified by thioglycollic acid (TGA) were synthesized with the microwave method. The modified CdS QDs are water-soluble, stable and highly luminescent. The possible mechanism for the reaction was also discussed. When sulfadiazine was added into the CdS QDs colloid solution, the surface of CdS QDs generates the electrostatic interaction in aqueous medium, which induces the quenching of fluorescence emission at 489 nm. Under optimum condition, the fluorescence intensity versus sulfadiazine concentration gave a linear response according Stern-Volmer equation with an excellent 0.9981 correlation coefficient. The linearity range of the calibration curve was 1.2 x 10(-5) to 2.13 x 10(-3) mol L(-1). The limit of detection (3delta) is 8.0 micromol L(-1). The relative standard deviation for five determinations of 0.13 x 10(-3)mol L(-1) sulfadiazine is 1.4%. The concentrations of sulfadiazine injections were determined by the proposed method with a satisfactory result.     

催化裂化催化剂上污染重金属含量测定的XRF光谱分析方法的研究

介绍了用 X射线荧光光谱测定催化裂化平衡催化剂上污染重金属 Fe、Ni、V、Cu、Sb和 Ca含量的分析方法。考查了影响 Fe、Ni等元素测定的各种因素 ,提出以新鲜催化剂为配制标样的载体 ,较好地克服了元素间互相干扰的影响 ,减少基体效应 ,取得了 Fe、Ni等元素含量的准确结果。实验结果表明 ,XRF光谱法测定催化剂上污染重金属元素的含量是一种快速、准确、简便的分析方法     

Thermal analysis and water-cooling design of the CSNS MEBT 324 MHz buncher cavity

At least two bunchers are needed in the 3 MeV H- Medium Energy Beam Transport(MEBT)line located between RFQ and DTL for the CSNS(China Spallation Neutron Source).A nose-cone geometry has been adopted as the type of buncher cavity for its simplicity,higher impedance and lower risk of multipacting.By making use of the results got from the simulations on the buncher with two-dimension code SUPERFISH,the thermal and structural analyses have been carried out,the process and results to determine the resulting frequency shift due to thermal and structural distortion of the cavity are presented,the water-cooling channel position and the optimum cooling water temperature as well as the tuning method by adjusting the cooling water temperature when the cavity is out of resonance are also determined through the analyses.     

四元数体上λ-多项式的线性因式分解

本文证明了实四元数体上任一次数大于１的λ－多项式可分解作一次因式的乘积给出了这样分解的若干性质及其在矩阵论中的应用。