生物温敏性水凝胶的研究

采用明胶和N-异丙基丙烯酰胺(NIPAM)为原料,制备了配比不同的明胶/聚N-异丙基丙烯酰胺(Gel/PNIPAM)水凝胶系列,研究了pH值、温度对水凝胶的溶胀度和溶胀速度的影响。结果表明,明胶/PNIPAM水凝胶对pH值、温度有明显的响应性,且随着组分中NIPAM配比的增加,水凝胶的温敏性明显增加;对水凝胶的溶胀动力学研究表明,体系配比对溶胀的影响与最低溶液临界温度(LCST)有关,当温度大于LCST时,溶胀速度及溶胀度随明胶含量的增加而增加,当温度低于LCST且配比为1/1(质量比)时,水凝胶的溶胀速度最大。     

基于敏感度的H.264视频容错编码算法

针对视频图像传输中数据丢失和误码而导致的图像质量下降问题,结合灵活宏块排序（FMO）技术和冗余编码的优缺点,提出了一种基于错误敏感度的H.264冗余片编码算法。该算法首先确定运动敏感区域中的错误敏感宏块,然后利用 FMO 自定义模式进行冗余编码。仿真测试结果表明,该算法能够有效提高视频码流的抗误码能力,重构图像的主观和客观质量有明显提高。     

Comparison of classifications using measures intermediate between metric dissimilarity and consensus similarity

Two fundamental approaches to the comparison of classifications (e g, partitions on the same finite set of objects) can be distinguished One approach is based upon measures of metric dissimilarity while the other is based upon measures of similarity, or consensus These approaches are not necessarily simple complements of each other Instead, each captures different, limited views of comparison of two classifications The properties of these measures are clarified by their relationships to Day's complexity models and to association measures of numerical taxonomy The two approaches to comparison are equated with the use of separation and minimum value sensitive measures, suggesting the potential application of an intermediate sensitive measure to the problem of comparison of classifications Such a measure is a linear combination of separation sensitive and minimum value sensitive components The application of these intermediate measures is contrasted with the two extremes The intermediate measure for the comparison of classifications is applied to a problem of character weighting arising in the analysis of Australian stream basinsWe thank Bill Day, Mike Austin, Peter Minchin and two anonymous referees for many helpful comments We also thank P Arabie for useful discussion of consensus methods and character weighting     

Humidity Sensitive Properties of a Coplymer of Quaternary Ammonium Salt with Polyether-salt Complex

1 Results Humidity sensors have been widely used in meteorology, process controlling, agriculture and manufacturing. In recent year, more attention has been paid to resistive-type polymeric humidity sensors. Polyelectrolytes are the most usually used materials for their advantages of high sensitivity, fast response, easy preparation, low cost, etc[1,2]. In this paper quaternized and salt-doped copolymer of 2-(dimethylamino) ethylmethacrylate (DMAEMA) with poly(ethylene glycol) methyl ether methacrylate ...     

一种新型气敏元件的研究

本文报道了复氧化物偏锡酸锌多晶体的合成工艺及以其为基体材料制作的新型(QM—Y1型)气敏元件的敏感特性和制备工艺,并讨论了敏感机理研究表明,这种气敏元件具有灵敏度高、稳定性好、响应时间与恢复时间短、电导率变化大等优点,可作为可燃性气体检测、检漏、监控和报警等设备中的理想探头。     

对非金属材料导热系数测量原理的修正

对稳态法测量原理进行了较深入的探讨,指出了用稳态法测定非金属材料导热系数的不足之处,并作了一定的修正,从而推出了计算导热系数的新公式。通过测定结果,验证了修正后的导热系数计算公式的正确性和合理性。     

酸铝对大麦不同耐性品种形态,生长及元素吸收的影响

通过对耐酸铝性不同的两个大麦品种进行耐酸铝性鉴定表明，两品种的苗高、根长及干重受到的影响均存在显著差异。经酸铝培养液处理后，敏感品种“嵊县无芒六棱”体内铝元素含量显著增加，而营养元素的含量却明显降低。     

稀土元素修饰双层薄膜的气敏特性

采用PECVD方法制备Fe2O3／SnO2双层气敏薄膜，利用浸渍方法对稀土元素（La，Nd，Sm，Er，Yb）与铝配制的乳浊液进行表面修饰．测试结果表明，修饰后的双层薄膜对乙醇或丙酮具有较高的灵敏度与选择性。     

超细SnO_2粉体应用于低温气敏材料及其机理探讨(Ⅰ)——不同吸附物种的作用和超细元件的氧溢流模型

将溶胶—凝胶—超临界流体干燥法所制超细ＳｎＯ２粉体应用于气敏材料，可以得到具有较大应用前景的低功耗气敏元件．本工作通过吸附性能和气敏效应的关联，特别是不同吸附物种对ＣＯ气体检测的作用研究，结合溢流现象，提出了超细元件的Ｐｄ－氧溢流模型，解释了超细粉体降低元件工作温度的原因     

丁基罗丹明B—铌钼杂多酸离子缔合物显色反应的研究

本文研究了基罗丹明B－铌钼杂多酸－聚乙烯醇体系的新高灵敏显色反应，在0．025－0．18mol/L硫酸溶液中，铌与酸铵形成铌钼杂多酸络合物，在聚乙烯醇存在下，在1．44－2．16mol/L硫酸介质中，铌钼杂多酸与丁基罗丹明B（BRB）形成离子缔合物，缔合物的最大吸收在580nm，表观摩尔吸光系数值为1．9×10^6，铌量在0－18ug/25ml符合比耳定律，用平衡移动法确定缔合物的摩尔比为Nb(V)：BRB＝1：3，可能的化学式为BRB3＋，[NbMo12O40^3-]，所提出的方法经合金钢和某些矿物中痕量铌的测定验证，结果较满意。