三氟乙酰对癸基苯为中性载体的碳酸根离子选择电极的制备和应用

实验比较了多种膜组分的性能 ,制得了有较长使用寿命的三氟乙酰对癸基苯为载体的 PVC膜碳酸根离子电极。适当增大膜中载体的含量 ,采用亲脂性强的增塑剂并加入适量增水性溶剂 ,有利于延长电极的使用寿命和增强抗亲脂性阴离子干扰的能力。已利用此种膜电极 ,以控制 p H标准比较法测定了模拟血清和质控血清中的碳酸根 。

铊(1)离子电化学传感器的研究——2.以30—冠—10铊(1)离子电极测定铊(1)

以合成的四种30—冠—10衍生物为中性载体制备了PVC膜铊(1)离子电极,探讨了冠醚结构、增塑剂、添加物与电极性能的关系。以10^(-2)mol/L醋酸镁为离子强度调节剂,邻苯二甲酸二丁酯增塑的添加有四(对氯苯)硼钾的四叔丁基二苯并—30—冠—10铊(1)电极的线性响应范围为1×10~5～5×10~2mo1/L(TINO_3),K_(Tl.k)^(pot)为0.18。同时应用该电极和缬氨霉素钾电极作为双指示电极,伴以选择系数校正,可以标准加入法测定铊(1)、钾共存溶液中≥5×10^(-5)mol/L(～10ppm)的Tl^-。

对PFTL图像加密算法的分析

对PFTL图像加密算法的安全性进行了分析,发现其存在信息泄漏规律,并基于此给出了攻击算法.利用图像像素置乱密钥与像素灰度值扩散密钥无关这个弱点进行了分割攻击,在已知明文图像的条件下,给出了在不同迭代圈数下的攻击算法,并对攻击算法的有效性进行了分析.由于原文中对算法的描述存在错误,因此本文给出了正确的灰度值扩散算法及密钥参数,以及通过试验得出了正确的密钥空间,分析结果表明算法的安全性远远低于设计目标.

中国兰科独蒜兰属植物增补

报道了中国兰科独蒜兰属2个未详知种:藏南独蒜兰(Pleione arunachalensis Hareesh, P.Kumar & M.Sabu)和矮小独蒜兰[P.humilis (Sm.) D.Don],并提供了详细的形态描述和照片。凭证标本保存于云南省林业和草原科学院植物标本馆(YAF)。

Formation of Hybrid Ring Structure of Cyanurate/Isocyanurate in the Reaction be-tween 2,4,6-Tris(4-Phenyl-Phenoxy)-1, 3,5-Triazine and Phenyl Glycidyl Ether

Reaction products of 2,4,6-tris(4-phenyl-phenoxy)-1,3,5-triazine derived from 4-phenylphenol cyanate ester and phenyl glycidyl ether were analyzed. In addition to an isocyanurate compound and an oxazolidone compound which were well known as reaction products of cyanate esters and epoxy resins, compounds with hybrid ring structure of cyanurate/isocyanurate were determined. Gibbs free energies of the compound having hybrid ring structure of cyanurate/isocyanurate with two isocyanurate moiety were found to be lower than that of the compound with cyanurate ring structure through calculations. Calculation data supported the existence of hybrid ring structure of cy-anurate/isocyanurate. It was revealed that isomerization from cyanurate to isocyanurate occurs via hybrid ring structure of cyanurate/isocyanurate in the reaction of aryl cyanurate and epoxy.