Comparison of Algorithms for an Electronic Nose in Identifying Liquors

When the electronic nose is used to identify different varieties of distilled liquors, the pattern recognition algorithm is chosen on the basis of the experience, which lacks the guiding principle. In this research, the different brands of distilled spirits were identified using the pattern recognition algorithms （principal component analysis and the artificial neural network）. The recognition rates of different algorithms were compared. The recognition rate of the Back Propagation Neural Network （BPNN） is the highest. Owing to the slow convergence speed of the BPNN, it tends easily to get into a local minimum. A chaotic BPNN was tried in order to overcome the disadvantage of the BPNN. The convergence speed of the chaotic BPNN is 75.5 times faster than that of the BPNN.     

集胞藻类金属硫蛋白的纯化、性质和溶液构象的研究

集胞藻Synechocystis sp.PCC 6803光照培养,加入100 μmol/L ZnCl     

反胶束萃取血红蛋白的研究

研究了ＣＴＡＢ－正辛醇－正庚烷交束溶液萃取牛血红蛋白（ｐＨｂ）时、ｐＨ值、表面活性剂浓度、助表面活性剂浓度、离子种类和离子强度、溶剂比以及蛋白质浓度等因素对萃取效果的影响,并以蛋白质分子与表面活性剂分子间的相互作用以及反胶束大空间阻碍作用上进行了解释。研究表明,水相ＰＨ值在１０．５￣１２．５之间,ＫＣ１浓度为０．１ｍｏｌ／ｌ,反胶束溶液中表面活性剂浓度为０．０２ｍｏｌ／ｌ,正辛醇与正庚烷之比为０．     

科技论文中计量单位格式简介

本刊对科技论文中计量单位的格式暂作如下规定:计量单位和单位符号以国家技术监督局发布的《量和单位》GB3100-3102-93执行。1.时间:日(天)用d;小时用h;分钟用min,秒用s等,单位符号均用英文小写正体。2.溶液浓度:溶液浓度用mol/L表示,而不用M或N。3.旋转速率:单位符号为r/min,而不用rpm。4.生物大分子的分子量:蛋白质用kD;核酸用bp或kb。5.光密度:光密度符号用斜体表示,如OD,OD 600等。6.图表中数值的量和单位:用量与单位的比值表示数值,即物理量符号(斜体)与单位(正体)之间用斜线隔开,如t/h(时间,单位是小时)。     

低浓度蔗糖铁溶液TOC检验方法探讨

本文的目的是通过灵敏度较高的TOC(总有机碳)法来测试蔗糖铁溶液低浓度的响应值。