RESEARCHES ON CHEMICALLY MODIFIED ELECTRODE——THE PREPARATION OF ELECTROCHEMISTRY POLYMERIZED FERROCENE DERIVATIVE FILM MODIFIED ELECTRODE

The voltammetric behaviour of ferrocene drivatives (α-hydroxy-, 1, 1′-bisα-hydroxyethyl-, aceto-, 1, 1′-bis-aceto-) has been studied in acetonotrile and aqueous solution. The electrochemical polymerization of such ferrocene metal]lo-organic compounds was first discovered under electrochemical initiation. Electrochemistry polymerized ferrocene derivative film modified electrode and the polymerizatibn mechanism have been presented and investigated. Electrochemical polymerization proceeds simply and rapidly, the polymerization process can be controlled, and the polymer film is stable and attaches firmly to the electrode. It is a new practical method for preparing modified electrode.     

电化学聚合法制备二茂铁衍生物聚合膜电极

本文研究了二茂铁衍生物(α-羟乙基-,1,1’-二α-羟乙基-,乙酰基-,1,-二乙酰基-)在乙腈溶液及水溶液中的电化学行为.首次发现这类二茂铁金属有机化合物在电化学引发下发生电聚合反应,提出用电化学聚合制备其聚合物膜修饰电极的方法,并对聚合反应机理作了初步探讨.电化学聚合法简便快速,聚合过程可控,膜稳定且与电极的接着牢固,是一种很有实用意义的制备修饰电极的方法。     

碳包覆纳米SnO2中空纤维的制备及电容性能

采用同轴静电纺丝法制备了碳包覆纳米SnO₂中空纤维超级电容器电极材料.利用X射线衍射(XRD)、拉曼光谱、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和比表面积分析仪(BET)对材料进行表征.结果表明,纤维呈现中空形貌,平均直径为1 μm; SnO₂颗粒均匀分布于碳壳结构中,平均粒径为3-15 nm.材料的比表面积为565 m²·g^-1.在三电极体系中,当电流密度为0.25 A·g^-1时,电极材料的比容量达397.5 F·g^-1;在1.0A·g^-1电流密度下,充放电循环3000次后比容量仍保持为初始值的88%.在对称型双电极体系中,电流密度为0.25 A·g^-1时,电极材料的比容量达162.0 F·g^-1,在1.0 A·g^-1电流密度下,充放电循环3000次后比容量仍保持为初始值的84%.     

A genetic resampling particle filter for freeway traffic-state estimation

On-line estimation of the state of traffic based on data sampled by electronic detectors is important for intelligent traffic management and control.Because a nonlinear feature exists in the traffic state,and because particle filters have good characteristics when it comes to solving the nonlinear problem,a genetic resampling particle filter is proposed to estimate the state of freeway traffic.In this paper,a freeway section of the northern third ring road in the city of Beijing in China is considered as the experimental object.By analysing the traffic-state characteristics of the freeway,the traffic is modeled based on the second-order validated macroscopic traffic flow model.In order to solve the particle degeneration issue in the performance of the particle filter,a genetic mechanism is introduced into the resampling process.The realization of a genetic particle filter for freeway traffic-state estimation is discussed in detail,and the filter estimation performance is validated and evaluated by the achieved experimental data.     

Symmetrical periods used as matching layers in multilayer thin film design

Properties of symmetrical layers as matching layers in multilayer thin film design were analyzed. A calculation method was presented to derive parameters of desired equivalent refractive index. A harmonic beam splitter was designed and fabricated to test this matching method.     

基于聚类的交易者煤炭质量检验可信度研究

研究提出了一个煤炭质量检验可信度的新定义,并设计了应用可信度识别交易者质量检验行为的聚类计算模型。在运用某大型煤炭企业及其联盟用户的煤炭质量检验数据实证基础上,研究发现:交易者煤炭质量检验行为存在统计规律,聚类方法能够在统计意义下识别交易者的质量检验行为特征,并据此推断商品的质量可信度。     

State of charge estimation of Li-ion batteries in an electric vehicle based on a radial-basis-function neural network

The on-line estimation of the state of charge(SOC) of the batteries is important for the reliable running of the pure electric vehicle in practice.Because a nonlinear feature exists in the batteries and the radial-basis-function neural network(RBF NN) has good characteristics to solve the nonlinear problem,a practical method for the SOC estimation of batteries based on the RBF NN with a small number of input variables and a simplified structure is proposed.Firstly,in this paper,the model of on-line SOC estimation with the RBF NN is set.Secondly,four important factors for estimating the SOC are confirmed based on the contribution analysis method,which simplifies the input variables of the RBF NN and enhances the real-time performance of estimation.Finally,the pure electric buses with LiFePO 4 Li-ion batteries running during the period of the 2010 Shanghai World Expo are considered as the experimental object.The performance of the SOC estimation is validated and evaluated by the battery data from the electric vehicle.     

一种关于汽车整车不确定需求的组合预测模型

提出了一种针对汽车生产企业整车不确定需求的组合预测模型,即利用神经网络拟合数据基本变化趋势,然后对企业产品的市场占有率进行评价,以调节需求变化趋势.应用实例,对模型进行了验证,说明该模型能够较好地诠释企业产品需求信息,具有较好的预测能力.     

双钙钛矿La2CoNiO6无机纳米纤维的制备及超级电容器性能

以聚乙烯吡咯烷酮/硝酸镧-乙酸钴-乙酸镍(PVP/LCN)为前驱体, 采用静电纺丝法, 经预氧化、碳化, 制得双钙钛矿La₂CoNiO₆无机纳米纤维超级电容器电极材料. 利用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对其形貌和结构进行表征. 结果表明, 纤维由菱形结构的La₂CoNiO₆纳米颗粒相互连接而成, 呈链状空间网状结构. 循环伏安(CV)、恒流充放电(CP)和循环寿命测试表明, La₂CoNiO₆纳米纤维电极材料在三电极体系中, 电流密度为0.25 A·g^-1时, 比电容值达335.0 F·g^-1; 在对称型双电极体系中, 电流密度为0.25 A·g^-1时, 比电容值可达到129.1 F·g^-1,表现出良好的电容性能.     

QuEChERS-冷冻诱导液液萃取/液相色谱-高分辨质谱法测定蔬菜水果中77种农药残留

基于QuEChERS－冷冻诱导液液萃取（CI－LLE）技术,建立了蔬菜水果中77种农药残留的超高效液相色谱－高分辨质谱检测方法。样品经常规QuEChERS方法提取、盐析和净化后,进一步以40%乙腈－水溶液对77种农药进行CI－LLE富集和净化。仪器分析以水－甲醇（两相中均含0.1%甲酸和4 mmol/L甲酸铵）为流动相进行梯度洗脱,C18色谱柱（2.6 μm,2.1 mm × 150 mm）分离,高分辨质谱以时间分段全扫描模式采集,内标法定量。结果显示,77种农药在一定浓度范围内呈良好的线性关系（r2 > 0.99）;方法检出限为0.02～0.20 μg/kg,定量下限为0.05～0.50 μg/kg。空白样品在4个不同加标水平的回收率为70.8%～119%,相对标准偏差（RSD）为0.70%～15%。该方法操作简单,重现性好,能降低基质效应对农残检测的影响,具有较高的灵敏度、准确度和精密度,符合农药多残留检测技术的要求,已应用于实际样品中农药残留的定性和定量分析。