钾电极法研究镧对铅,镉伤害植物花粉细胞的缓解作用

以植物粉细胞为试验体系，利用Ｋ＾＋离子电极法测定了Ｐｂ＾２＋、Ｃｄ＾２＋对花粉细胞质膜透性的影响及Ｌａ＾３＋的缓解效应。主要结果为：Ｐｂ＾２＋、Ｃｄ＾２＋在极低浓度时就使花粉细胞质膜透性明显增大，表现为伤害作用；而Ｌａ＾３＋对花粉细胞质膜透性有明显的降低作用；Ｌａ＾３＋离子的存在则能显著地降低Ｐｂ＾２＋、Ｃｄ＾２＋的伤艇。     

离子选择电极流动注射分析法测定铜

本文用流动注射分析法测定了铜的浓度，检测系统由铜离子选择电极和饱和甘汞电极组成。为了获得稳定的基线，采用含１×１０＾－６ｍｏｌ／ＬＣｕ＾２＋的０．１ｍｏｌ／ＬＫＮＯ３溶液作为载流，文中考察了载流流速和溶液ｐＨ值对响应的影响，在选定条件下，用本法对含铜废水进行了分析，所得结果与分光光度法测定结果进行对照，颇为接近。本法的检测下限达０．２ｐｐｍＣｕ＾２＋进样频率６０样／ｈ。该法水质检验和环境监测中有一     

管膜式镉离子选择性电极—流动注射法测定高纯水中微量钙

本文报导了管膜式钙离子选择性电极的制备，并讨论了用于流动注射法测定高纯水中微量钙离子浓度的方法，应用金属缓冲溶液时，可将检测下限延伸至２．８×１０＾－８ｍｏｌ／Ｌ，Ｃａ＾２＋。为电力系统高纯水硬度的测定提供了一个灵敏度及精度更高的方法。     

钴取代磷钨杂多阴离子（α—P2W17Co）修饰电极的研制及其应用

本文研究了钴取代磷钨杂多阴离子（α－Ｐ２Ｗ１７Ｃｏ）修饰电极的制备及其电化学性质，制备的α－Ｐ２Ｗ１７Ｃｏ修饰电极具有良好的稳定性和氧化还原活性，修饰底液的浓度、酸度和扫描电位范围对该薄膜电极的稳定性和电化学性能产生较大的影响。α－Ｐ２Ｗ１７Ｃｏ修饰电极择于Ｃ１Ｏ３＾－１具有电催化作用，催化电流（△Ｉｐ）与氯酸根离子浓度在１．０×１０＾－６￣１．０×１０＾－４范围内呈良好线性关系，测定了天然水中Ｃ     

人工神经网络用于以类脂膜为涂层的单个压电晶体传感器定量检测液相 …

以合成的类脂膜２Ｃ１８Ｎ＾＋２Ｃ１／肝素钠涂于压电晶体传感器表面来检测液相混合物。通过用单个压电晶体观测校正集和检测集样品的动力学吸附曲线，以不同时间窗口的频率响应值作为人工神经网络（ＡＮＮ）的输入单元，输出单元对应于混合物中各组分的浓度，在用校正集训练后，对检验集样品的浓度进行预测。分析物两且，第一组含两个组分：正努力醇、β－萘酚；第二组含三种表面活性剂；十二烷基硫酸钠，十二烷基苯磺酸钠、Ｎ＋＿     

硒化汞固体膜电极的研制

文中介绍了硒化汞固体膜电极的制作方法，并测定它的各种特性，其中对硝酸汞系列标准液的呼应范围在１０＾－７￣１０＾－２ｍｏｌ／Ｌ内呈直线关系，电极的斜率为３１．２０ｍＶ／△ｐＭ，适应的ＰＨ范围在３．５￣６．０间，响应时间在５分种内，主要干扰离子为Ａｇ＾＋，Ｂｒ＾－，Ｉ＾－１等。     

新型稀土电极—水膜及PVC膜钐离子电极的制备

本文研究了新型稀土电极－水膜及ＰＶＣ膜钐离子电极的制备。水膜钐电极对低介电常数有机溶剂－磷酸三丁酯中的三价钐离子具有能斯特响应，响应曲线斜率为１９ｍＶ／ｐＣｓｍ＾３＋，线性范围是１．０×１０＾－４－１．０×１０＾－２ｍｏｌ·ｄｍ×－３，支持电解质和液接电势不影响响应典型的斜率。     

汞希夫碱化合物载体电极的阴离子响应行为研究

汞希夫碱化合物为载体的ＰＶＣ膜电极表现出反Ｈｏｆｍｅｉｓｔｅｒ行为，其选择序列为Ｉ＾－〉ＮＯ＾－２〉ＣｌＯ＾－４〉ＳＣＮ＾－〉Ｂｒ＾－〉ＮＯ＾－３〉Ｓａｌ＾－〉Ｃｌ＾－〉ＳＯ＾２－４。电极在１０＾－２－１０＾－６ｍｏｌ／Ｌ的浓度范围内对Ｉ＾－具有线性响应，斜率为５８．９ｍＶ／ｐＩ。该有响应性能不受测试底液中还原性稳定剂的影响。     

电聚合金属席夫碱配合物修饰电极作为碘离子电位型传感器的研究

本文研究了电聚合金属席夫碱配合物修饰电极对碘离子的选择性响应。Ｃｏ－ｓａｌｅｎ聚合膜电极对碘离子具有良好的电位响应,响应斜率为－７２．５ｍＶ／ｄｅｃ,线性范围为２．０×１０＾－６－１．０×１０＾－１ｍｏｌ／Ｌ,探讨了聚合膜厚度,ｐＨ值对电极性能的影响,同时对电极的响应机理作了进一步的探讨。     

Gatmull—Rom几何样条曲面的应用

本文讨论了Ｃａｔｍｕｌｌ－Ｒｏｍ样条族中的几何连续的Ｃａｔｍｕｌｌ－Ｒｏｍ样条的构造，算法，性质及（Ｇ＾１，Ｋ＝１）Ｃａｔｍｕｌｌ－Ｒｏｍ样条曲面和（Ｇ＾２，Ｋ＝２）Ｃａｔｍｕｌｌ－Ｒｏｍ样条曲面的算法，并给出了应用实例。     

基于演算子理论的IPMC人工肌肉精确位置控制

IPMC(Ionic Polymer Metal Composite)人工肌肉是一种离子交换聚合金属材料,由于具有在低电压作用下可以产生较大弯曲的特性,已经被作为分布式传感器和执行器广泛应用于各种仿生机器人构建中。为了在各种仿生机器人中应用IPMC人工肌肉,期望的位置或偏移量必须能够精确地控制。针对这个问题,通过应用鲁棒右互质分解方法,本文设计一种基于演算子理论的IPMC人工肌肉精确位置控制系统,该系统不仅保证了鲁棒稳定性,而且能够实现精确的位置跟踪。最后,通过仿真和实验结果,系统的有效性进一步得到验证。     

循环冷却水系统成垢过程软件预测

循环冷却水系统中无机垢的形成预测是一个相当复杂的研究课题，涉及到包括热力学、动力学、流体力学、晶体生长和表面化学等方面的知识。到目前为止，人们已经提出许多理论来试图解决此难题。但不足在于这些理论对成垢过程影响因素的讨论很不全面。本文几乎考虑了冷却水中常见的所有成垢阳、阴离子和非成垢离子，详细讨论了水溶液中所存在的各种平衡，并考察了温度、pH值、离子强度等因素对成垢过程的影响。所建立的模型通过实验数据进行了验证。结果显示，模型的计算结果与实验数据大体一致。利用Visual Basic6．0语言开发循环冷却水系统成垢预测专家系统软件。该软件可在windows 9X操作平台下独立运行，具有界面友好、操作方便、运行可靠稳定等优点。     

印刷表格文本分析识别系统的研究

本文介绍了一个印刷表格文本分析识别系统。提出了表格特征点分析方法。在表格图象处理的基础上, 对表格线进行分析, 在考虑表格线和字符块粘连的情况下提取字符块, 判别汉字串和数英串后分别识别, 生成表格。实验表明本方法的有效性。     

基于自动路测系统的数据业务评估与优化

现有自动路测系统依托对城市网格化的管理手段,通过前、后台结合,有效地实现了三大运营商多项业务的测试与分析,完全取代了以往人工执行第三方测试工作,达到了实时进行网络质量评估监控的目的,实现了由集团到省公司从上至下测试数据共享,并通过分时管理方式达到资源利用率最大化的目的,为集团各期网络质量考核提供了重要的支撑,本文就自动路测系统在数据业务中测试评估、优化分析等方面的应用进行详细介绍.     

Structural and dynamical properties of concentrated aqueous NaOH solutions: a computer simulation study

Molecular dynamics simulations of NaOH aqueous solutions have been performed with a flexible model of the water molecule. Ion-ion interactions have been described by the (12-6) Lennard-Jones type and coulomb potentials. The concentration of the solutions ranged from 0.5 to 19 M. The structures of hydration shells of the ions were analysed using the radial distribution functions, Voronoi tessellations, the running and O'Keeffe coordination numbers and other tools. Structural properties obtained from simulations agreed reasonably well with results of the available experimental data. The dynamical properties were calculated and compared with experimental measurements. A particularly careful analysis was applied to the topological properties of the ionic structures in solution. The results of calculations suggest an existence of the ordered structures of ions in solution and supports the Ruff theory of ionic quasi-lattices in concentrated solutions.     

Analysis of configuration of surface-immobilized proteins by Si nanochannel field effect transistor biosensor

We demonstrate the application of ‘top-down’ fabricated Si nanochannel field effect transistor biosensors for measuring charging properties or configuration of proteins immobilized on the Si surface. We have immobilized monoclonal antibodies for prostate specific antigen (anti-PSA) on the p-type Si channel surface, and monitored the channel conductance in response to the variation of ionic strength (salt concentration) and pH of the buffer solution. Effects of the salt concentration at a constant pH is consistent with the screening of protein charges by dissolved counter-ions, enabling analysis of the net protein charge and spatial configuration based on calculated values of Debye screening length (λ_D). The pH-dependence of channel conductance at varying salt concentration has also been investigated, from which the relationship between the pH and net protein charge can be estimated.     

一种基于光谱的同步快速测定离子浓度方法

为了同步快速测定水中多种离子的浓度,提出了一种光学检测与综合数据处理相结合的方法.该方法基于分光光度法原理,能够快速测得混合离子光谱.用小波降噪、主成分分析降噪和差分降噪对测得数据进行综合处理.其中解决光谱重叠问题是提高测定精度的关键,目前多采用化学或物理的方法消除重叠,速度较慢;而采用待测多种离子的标准光谱,进行鲁棒(稳健)回归分析来消除重叠,其速度快,从软硬件两方面保证了快速性,且便于测量装置小型化.实测表明本方法测定精度高、速度快,同时能完成两种离子浓度的同步测定.     

分散系介电理论的数值计算方法

介电谱方法能够对体系非破坏连续监测了解体系有关动力学,结果特征和电的性质,在化学研究中发挥着很大的作用,分散系介电理论公式大多数是复杂的复数方程,解析时繁琐的数学推导,拟合及求解高次方程给介电研究带来很大困难,为了解决上述剖,本文利用C＋＋语言并引入复数类对Moaxwel-Wagne界面极化理论和Hanai理论的介电解析以及Cole-Cole 公式的模拟进行了程序化,讨论了Hanai理论曲线的影响因素, 同时把该程序应用于微乳状液及文献中球型分散体系的介电解析,结果表明该程序能有效,准确地根据体系的介电参数解析出体系的相参数,进一步分析可得到体系的结构特性,提高了介电谱方法定性和定量研究的水平。     

Electrothermal-driven gap adjustable MEMS comb structure: modeling and simulation of the equivalent circuit macromodel

Theoretical model of gap adjustable comb structure has been presented in this paper. This structure can be used to increase the sensitivity of sensor. As an example, an electrothermal-driven gap adjustable comb structure has been proposed, and the mechanical–electrical coupling equations of the system have been derived. According to the coupling equations, a macromodel of the comb structure has been presented through the combine of equivalent circuit method and nodal analysis method. Simulation of the macromodel has been carried out with SPICE, and the result agreed with the FEA result in a certain range of accuracy. The result has also been compared with theoretical analysis, which coincide the theoretical solution fully. Amplitude modulation characteristics of the gap adjustable comb structure have also been studied with SPICE in this paper.     

Multichannel active noise equalization of interior noise

An algorithmic variant of the conventional active noise equalizer (ANE), which independently controls some given frequencies of the primary signal, has been developed and extended to the multichannel case. The modified version of the ANE is named common-error multiple-frequency ANE. A detailed analysis of both multichannel equalizers has been carried out. From a convergence analysis in the frequency-domain, the significance of transducer locations in the behavior of a practical system can be predicted through the matrix of secondary path responses at each frequency. The ANEs steady-state transfer functions from the primary input signal to the noise output have also been developed and compared for different parameter settings and for accurate and inaccurate secondary path estimation. Furthermore, the multichannel extension of both equalizers has been implemented in a real-time active system inside a listening room for multifrequency noise. Useful-size zones of equalization have been binaurally measured by using a head and torso simulator. It was found that the common-error multiple-frequency ANE performs better than the conventional equalizer because it achieves a saving in computational complexity and has smaller overshoot. It can also be implemented in a real controller more easily than the conventional ANE and without showing meaningful differences in the practical results provided.