计算机拟合络合物形成曲线用于络合物稳定常数的研究

在Cd(Ⅱ)离子浓度为2×10~(-4)mol/L、络合剂与金属浓度比为30～60条件下,改变溶液的pH值,用示差脉冲极谱技术研究Cd(Ⅱ)-HIDA(N-羟乙基-N,N-二羧乙基胺)体系。通过计算机分析程序求解体系的质量平衡方程及拟合实验络合物形成曲线,优化得到Cd(Ⅱ)和HIDA形成的络合物CdL和CdL_2~(2-)的稳定常数,分别为7.26±0.02和12.54±0.04。     

金属离子极谱峰电位的精确拟合解析

利用计算机技术对实验测定的铋离子示差脉冲极谱数据进行了如下处理:1)用修正的Gaossian方程拟合实验测定的极谱曲线,得到精确至±0.05mV的极谱峰电位;2)用极谱数据计算机分析系统CFC-Ⅱ计算因Bi(OH)~(2+)络合物的形成而造成的极谱峰电位移动值;3)对校正过的金属离子极谱峰电位值进行多项式曲线拟合,得到整个pH区间铋离子(Bi~(3+))的示差极谱峰电位值。数据处理与分析结果表明:当溶液的pH<2.5时,可以利用关系式E_p(mV)=-0.252[pH]~4+5.8748[pH]~3-37.673[pH]~2+94.303[pH]+19.1计算科离子的极谱峰电位(相对于银/氯化银参比电极);当溶液的pH值在2.5以上时,铋离子的极谱峰电位为101.13mV     

戊二醛偶联组氨酸修饰金电极测定铜离子的研究

本文主要研究了一种基于戊二醛偶联组氨酸修饰金电极的方法 ,并以该修饰电极为工作电极利用方波伏安法建立了一种检测痕量铜离子的新方法。在铜溶液中搅拌富集 ,铜离子与修饰电极表面的组氨酸形成配合物吸附在电极表面 ,在磷酸缓冲液 (pH 6 8)中 ,该配合物具有良好的电化学响应。在对不同浓度的铜离子进行检测时发现在 1× 10 - 1 2 ～ 1 8× 10 - 1 1 mol/L和 5× 10 - 7～ 2 1× 10 - 5mol/L之间方波伏安还原峰电流与铜离子浓度呈现良好的线性关系 ,其最低检测限可达 0 5× 10 - 1 2 mol/L ,并对可能的检测机理进行了探讨     

羟苄唑PVC膜电极及PVC膜石墨棒电极的研究

羟苄唑是治疗急性出血性结膜炎的药物,其PVC膜电极的研制及应用尚未见报导。作者据以前工作,以羟苄唑—四苯硼离子缔合物为活性物质研制成羟苄唑PVC膜电极(Ⅰ)及PVC膜石墨棒电极(Ⅱ)。经测试,(Ⅰ)的能斯特响应范围为1.0×10~(-2)—4.0×10~(-5)M,检测下限为5.6×10~(-6)M;对羟苄唑的回收率为100.2—105.1％(Ⅱ)的能斯特响应范围为1.0×10~(-2)M—4.3×10~(-5)M,检测下限为8.9×10~(-5)M,回收率为98.6—     

双选择电极传感硫离子监测仪的电分析性能

双选择电极传感硫离子监测仪的设计,是基于硫离子在溶液中的酸碱平衡理论,仪器采用三电极系统。仪器的特点是:试液 pH 在一定范围内波动,而测值不受影响。仪器采用加法电路测量电平、使用比例放大器、增益与定位电路、高输入阻抗低输入电流的运放跟随器等,对测量按键示作了新安排。 监测仪的直流电压测量误差为士0.lmv,pH测量误差为士O.O01pH、测定方法误差为士5%水平,对pHI~5.5试液,测值波动士1.3mV,对pH9~12试液其实际测值波动士1.OmV。用于流通系统中硫子的监侧,对3.OO×10~(-3)、3.00×10(-4)、3.00×10(-x),mol/L溶液,其标差分别为0.14×l0(-3)、0.15×10(-4)、0.17×10(-5)mol/L均能满足环境监测要求,本仪器具有一定实用价值.     

聚合物碳糊修饰电极的研究

本文用聚4—乙烯基吡啶(PVP)修饰石墨粉制备聚合物碳糊修饰电极。在 pH3.5的0.15mol·dm~(-3)NaF 溶液中,将 Cr(Vl)于0.90V(VS.SCE,下同)富集1.5min,然后向阴极扫描至—0.20V 得 i—E 图,Cr(Vl)的峰电位为0.15V。在1.00×10~(-5)～1.00×10~(-6)mol·dm~(-3)范围内 Cr(Vl)浓度与峰高成比例。用于水样测定结果满意。     

以异双四齿Schiff碱金属铜(Ⅱ)配合物为载体的高选择性硫氰酸根电极的研究

该文研究了异双四齿Schiff碱铜(Ⅱ)金属配合物[Cu(Ⅱ)-USTT],研究了基于该种金属配合物为中性载体的阴离子选择性电极的电位响应特性.该电极对硫氰酸根离子呈现出优良的电位响应性能和选择性,其选择性序列为:SCN-＞C104-＞I-＞NO3-＞SO32-＞NO2-＞Cl-＞CH3COO-＞Br-＞SO42-,电极在pH=4.0的磷酸盐缓冲体系中对SCN-在1.0×10-1～1.0×10-6 mol/L浓度范围内呈近能斯特响应,斜率为-54.8 mV/dec,检测下限为2.6×10-6 mol/L.采用紫外光谱分析技术研究了阴离子与载体的作用机理.电极制作简便,响应快,重现性和稳定性好.将该电极用于环境废水中SCN-的监测,获得满意的结果.     

大×杜·大河三元杂种猪作为云腿原料的试验研究

大河猪原产于云南省富源县,是云腿的重要原料猪种。试验对大×杜·大河和杜×大河两个杂交组合的主要经济性状进行了观测研究,并选择当地农户广泛应用的长×荣组合作对照,进行了腌制火腿的品质测定。结果显示,大×杜·大河组合窝产仔数10.28头±2.42头,窝均育成仔猪9.31头±2.74头,肥育日增重773g±58g,极显著高于杜×大河组合(P<0.01);瘦肉率58.1%±2.41%,后腿比例30.85%±0.48%,显著高于杜×大河组合(P<0.05),且肉色、pH、大理石纹均为正常。腌制火腿,大×杜·大河组合的产品率、瘦肉率及色、香、味评定均优于其他组合,主要卫生指标达到了国家GB2731-88一级火腿标准,含盐量6.12%,比宣威火腿的7%低0.88个百分点。大×杜·大河三元杂种为云腿产区火腿原料高效优质猪源。     

基于双核汞(Ⅱ)配合物为中性载体的碘离子选择性电极的研究

研究了以水杨醛缩邻苯二胺为配体的双核金属Cu(Ⅱ)、Hg(Ⅱ)配合物为中性载体的阴离子选择性电极,结果表明,双核Hg(Ⅱ)配合物作为中性载体的电极对I-具有良好的电位响应特性,且呈现反Hofmeister行为,其选择性序列为:I-＞Sal-＞ClO4-＞SCN-＞Br-＞F-＞NO2-＞NO3-＞SO32-＞SO42-＞H2PO4-.在pH 3.0的磷酸盐缓冲体系中该电极对I-具有最佳的电位响应,在1.0×10-1～9.0×10-6 mol/L浓度范围内呈近能斯特响应,斜率为-56.5mY/pI-(25℃),检测下限为7.8×10-6mol/L,采用交流阻抗及紫外可见光谱技术研究了电极的响应机理,并将电极用于药品分析,结果满意.     

基于塑料光纤的Cd(Ⅱ)传感器吸收光谱信号处理研究

基于光纤传感的优点,采用塑料光纤对Cd(Ⅱ)与对硝基苯重氮氨基偶氮苯反应的溶液进行吸收光谱采集和处理.研究主要包含测量的结构、实验过程、对实际采集光谱信号进行低通滤波处理以及在此基础上对Cd(Ⅱ)四种浓度的光谱信号谱峰值的非线性拟合.该方法对Cd(11)的测量下限可以达到0.0047 μg/mL.     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.