基于聚苯胺/氧化钴的磷酸根修饰电极研究

研究了一种基于聚苯胺/氧化钴的磷酸根修饰电极。该电极以玻碳电极为基底电极,以掺杂钴离子的聚苯胺为电极敏感膜。通过实验比较,得到对磷酸二氢根响应较好的钴离子掺杂浓度。制成的电极能斯特响应线性范围在10－1～10－4 mol/L,斜率为－27.1 mV/dec,检测下限为9.3×10－5 mol/L;电极具有较短的响应时间,很好的稳定性和重复性,对磷酸根的检测具有一定的研究意义。     

基于双核酞菁铜为中性载体的水杨酸根选择性电极的研究

合成了一种双核酞菁铜的衍生物,并将其用于离子选择性电极的敏感材料,制备出了基于该载体的水杨酸根离子(Sal-)选择性电极.该电极对Sal-呈现出良好的选择性和近能斯特电位响应性能.电极斜率为-56.5 mV/dec,线性范围为1.0×10-1～2.2×10-6mol/L,检测下限8.9×10-7mol/L.该电极用于了阿司匹林药片中水杨酸含量的分析,结果令人满意.     

基于硼掺杂金刚石电极的酚生物传感器的研究

该文研究了以硼掺杂金刚石为基底电极的酪氨酸酶传感器.该酶传感器对酚的催化作用强于以玻碳为基底电极的酪氨酸酶传感器.在浓度为1.0×10-8～1.0×10-5mol/L的范围内传感器对邻苯二酚的响应具有良好的线性关系,检测下限为5.2×10-9mol/L.酶电极的Michaelis-Metent常数(Kapp m)为33.65μmol/L.酶电极对苯酚和对甲苯酚也有良好的响应,线性范围分别为:5.0×10-8～2.0×10-5mol/L、5.0×10-8～5.0×10-6 mol/L.酶传感器有较好的稳定性和重现性.     

纳米金、聚天青Ⅰ修饰铂电极的电流型葡萄糖传感器

用循环伏安法在铂金电极上电聚合一层稳定的天青Ⅰ聚合物膜.研究了这层膜在0.1 mol/L磷酸缓冲溶液(pH6.5)中的电化学性质.用纳米金溶胶与聚乙烯醇缩丁醛(PVB)构成复合固酶基质,采用溶胶-凝胶法固定葡萄糖氧化酶(GOD)于天青Ⅰ修饰的铂金电极表面,制成了新型葡萄糖生物传感器.实验发现,所制备的传感器具有响应快、灵敏度高、稳定性好,对葡萄糖的线性响应范围为1.2×10-5～7.5×10-3mol/L,检测下限为6.0×10-6mol/L.并具有抗坏血酸、尿酸干扰的特点.     

PVC膜山梨酸根离子选择电极的研制和应用

以山梨酸—三庚基十二烷基代季铵离子缔合物为电活性物质.制备了 PVC 膜山梨酸根离子选择电极。电极在4.0×10~(-5)～1.0×10~(-1)mol/L 范围内线性响应良好,电极的检测限度为1.6×10~(-5)mol/L,平均斜率为60mV/pC。电极重现性、稳定性良好,且具有较好的选择性。电极用于智力——Ⅱ号糖浆中山梨酸含量测定.平均回收率为95～98%,变动系数<2%。     

聚乙烯缩丁醛膜固定聚亚甲基蓝和纳米银修饰的葡萄糖生物传感器

用循环伏安法在玻碳电极上电聚合一层稳定的亚甲蓝聚合物膜,研究了这层膜在0.1 mol/L磷酸缓冲溶液(pH 7.0)中的电化学性质.用纳米银颗粒吸附葡萄糖氧化酶(GOD),采用乙烯醇缩丁醛(PVB)为辅助固酶基质将其固定于亚甲蓝修饰的玻碳电极表面,制成了新型葡萄糖生物传感器.实验发现,加入纳米银后提高了酶电极对葡萄糖的电流响应,所制备的传感器具有响应快、灵敏度高、稳定性好,对葡萄糖的线性响应范围为2.5×10-6～2×10-3mol/L,检测下限为1×10-6 mol/L,并具有抗坏血酸、抗尿酸干扰的特点.     

聚L-苯丙氨酸/铁氰根修饰电极的制备及其对Vc的测定

制备了聚L-苯丙氨酸/铁氰根修饰电极,研究了Vc在该修饰电极上的电化学行为,建立了一种测定Vc的新方法.该方法简便准确.检测下限可达2.4x 10-7mol/L,在4.0x 10-7～2.0x 10-2mol/L的浓度范围内,峰电流与Vc的浓度呈良好的线性关系.该电极用于测定Vc片中Vc的含量,结果令人满意.     

基于铜修饰硝酸根传感器的研究

基于方波伏安法制备铜层修饰玻碳电极,同时利用新鲜的敏感铜膜催化还原硝酸根。讨论了电解质及pH值等参数对硝酸根还原电流的影响。硝酸根离子的浓度与还原电流密度呈良好的线性关系,峰电流与硝酸根离子浓度在10μmol/L～1000μmol/L浓度范围内,灵敏度为0.0292 A/(mol.L-1),线性度为0.9991;在1000μmol/L～5500μmol/L浓度范围内,灵敏度为0.0225 A/(mol.L-1),线性度为0.9922。考察了NO-2,Cl-,HPO24-,CO23-,SO24-,H2PO-4,PO34-,等水体中常见离子对铜镀电极的干扰性,电极表现出较好的抗干扰性。此电极对应用于环境水质中硝酸根含量的检测有重要意义。     

基于氮化钛的银离子选择电极的研制

该文研究了基于氮化钛的银离子选择电极的制备及其响应性能.研究结果表明该电极对Ag 的响应斜率约为60 mV/dec,线性范围为1×10-2mol/L～1×10-5mol/L,检测下限为6.3×10-6mol/L.     

基于光固化聚合膜水杨酸根离子选择性电极的研究

以二丙烯酸脂肪族尿烷酯为基料,碘化十二烷基三庚基铵为离子载体,采用光固化聚合膜研制水杨酸根电位传感器.实验中对膜的成份,诸如交联剂、增塑剂、引发剂的种类和用量以及载体的用量进行了优化.优化后的膜与PVC膜比较具有较大的机械强度和较高的附着力,制成的电极对水杨酸根离子响应的线性范围为1.6×10-5～1.0×10-1mol/L,检测下限5.6×106mol/L,电极斜率为55.5 mV/decade,对常见阴离子电位选择性系数进行了测试,电极具有较好的选择性,用于人体尿液样品水杨酸根的测定获得满意的结果.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。