THE TRANSFER BEHAVIOUR OF SOME CATIONS AT WATER／NITROBENZENE INTERFACE BY SEMIDIFFERENTIAL CYCLIC VOLTAMMETRY

The transfer of Sr~(2+) and Ba~(2+) ion, facilitated by 18-Crown-6 present in the aqueous phase, and of succinylcholine ion at w/nb interface were investigated by semi-differential cyclic voltammetry. A good polarographic curve of succinylcholine ion dissolved in water was obtained in the system of 0.01 mol/l LiCl (w)——0.01 mol/l TBATPB (nb). The peak current is directly proportional to the concentration of SC~(2+) ion. It can be used for the determination of SC and the detection limit is 1.05×10~(-5) mol/l.The apparent D~w and D~(nb) have been estimated. The transfer of Sr~(2+) and of Ba~(2+) at the interface are facilitated by 18-Crown-6 present in the aqueous phase and the peak current is directly proportional to the concentration of 18-Crown-6 in water. This method can be used for the determination of the complexing agent and for the stability constant of the complex formed in the aqueous phase.All the experimental results are in keeping with the theoretical.     

Catecholamine metabolism in the vas deferens and the adrenal gland with special reference to the central catecholamine-depleted state

Experiments were carried out to elucidate the role of central catecholamines in regulating catecholamine metabolism in the vas deferens and adrenal gland of the rat. Rats were injected intracerebroventricularly (i.c.v.) with either vehicle or 6-hydroxydopamine (6-OHDA). Groups of animals pretreated with vehicle or 6-OHDA (i.c.v.) were injected intraperitoneally (i.p.) with alpha-methyl-para-tyrosine (AMT), a tyrosine hydroxylase inhibitor. Catecholamine turnover rates were estimated by determining norepinephrine or epinephrine content after administrating AMT.Central norepinephrine and dopamine contents decreased significantly (p<0.05) after treatment with 6-OHDA and AMT. The norepinephrine content of the vas deferens of rats pretreated with 6-OHDA was markedly reduced (p<0.001) after administration of AMT, whereas that of the vehicle-treated rats remained unchanged. Administration of 6-OHDA had no effect on the norepinephrine or epinephrine content of the adrenal gland.The present results indicate that central monoaminergic neurons have an inhibitory effect on the adrenergic neurons of the vas deferens. In contrast, this inhibitory regulation does not appear to be exerted on the adrenal glands.     

信号消噪的小波处理方法及其应用

通过对噪声特性的分析并用小波的方法对信号进行消噪处理，利用Matlab软件演示信号消噪的效果，并总结出小波分析对信号消噪的优点．     

1-(6-硝基-2-苯并噻唑)-3-(4-硝基苯)-三氮烯与镍显色反应的研究及应用

在TritonX-100表面活性剂存在下,研究了1-(6-硝基-2-苯并噻唑)-3-(4-硝基苯)-三氮烯(NBTNPT)与镍的显色反应.在pH为10.0～11.5的Na2B4O7-NaOH缓冲溶液中,该试剂与镍生成2∶1配合物.以500nm为参比波长,440nm为测定波长的双峰双波长进行测定,表观摩尔吸光系数为1.84×105L·mol-1·cm-1.Ni2+的浓度在0～280μg/L内符合比耳定律.用拟定方法测定钢铁中的微量镍,结果满意.     

构建健康网络平台的策略

阐述了当前互联网发展的状况及存在的问题,提出了构建健康网络平台的策略。     

作为生物探针的噻唑橙类化合物的合成及光谱性质研究

以6-甲基-2-氨基苯并噻唑为原料,合成了噻唑橙染料的一个衍生物,并比较了它与其他两种噻唑橙类染料的光谱性质,讨论了取代基的引入对于染料光谱性质的影响.结果表明,与噻唑橙相比,在分子中引入甲基后,染料的最大吸收波长发生红移;与蛋白结合后最大吸收波长红移,荧光最大波长蓝移.     

移动IPV6中的DoS和DDoS攻击分析与对策

移动IPv6由于其移动性要求而引起了一系列新的安全问题.本文着重对移动IPv6的返回路由性过程的算法进行了分析,指出该算法导致DoS和DDoS攻击的原因,并根据此过程中的攻击特性提出了一种增强的返回路由过程来防御攻击的措施.     

流动注射化学发光增强法测定酪氨酸

在Na2CO3-NaHCO3介质中,酪氨酸对Luminol-K3Fe(CN)6化学发光体系有很强的增敏作用.据此建立了流动注射化学发光增强法测定酪氨酸的方法.发光信号的增强值(ΔI)与酪氨酸的浓度在5.0×10-5～4.0×10-7mol/L的范围内呈良好的线性关系,检出限为1×10-7mol/L(S/N=3),对于1.0×10-6mol/L的酪氨酸测定相对标准偏差为2.4%(N=11).该法用于测定医用氨基酸注射液中的酪氨酸,结果令人满意.     

应用等维新息双向差分灰色模型进行趋势分析的新发现

本建立了最佳等维新息双向差分灰色模型，不仅拓宽了灰色预测的适用范围，而且还通过维数选择确定了最佳维数；使用最新数学工具软件MATLAB进行编程，同时通过对上证周指进行趋势分析，该等维新息预测能较准确地预测未来随机时间序列的涨、跌幅度。     

数字图象的二值化处理技术探究

分析了数字图象二值化处理的特点，提供了几种二值化处理技术，并对这些算法进行了测试与比较，最后根据实践应用对二值化处理中的动态阈值的选取策略等相关技术作出了阐述。