Investigation of gas concentration cell based on LiSiPO electrolyte and Li_2CO_3,Au electrode

Solid lithium ion conducting electrochemical cells using LiSiPO as solid electrolyte and Li2CO3 mixed with Au as electrodes were prepared and employed as chemical sensors for the detection of CO2 gas.The EMF of the cell depends on the concentration of CO2 in air according to the partial pressure dependence of Nernst's law in the investigated range from 100 to 2000 ppm over the temperature range from 473 K to 673 K.     

Deformation Behaviors of Laser Forming of Ring Sheet Metals

Laser forming is a highly flexible sheet metal forming technique. In laser forming along curved irradiation paths, the heated zone is bigger and the effects of the processing parameters on the deformation are complex. The deformation behaviors of laser forming of ring sheet metals have been investigated from the thermal-mechanics analysis by the finite element (FE) simulation based on the proposed finite element method model. The effects of ring central angle and scanning path on deformation of ring sheet metal were investigated. The results are as follows: (1) in comparison with the laser bending along linear path, the marked third point has two peak temperatures during the laser forming process along curved path; (2) the forming process fluctutes continuously and the sheet edge is warped because the rigid-ends effect due to the restriction of sheet; (3) when the ring central angle increases, the displacement difference of the marked three points decreases and then increases, and the warped curvature of sheet edge decreases; (4) when the laser beam diameter increases, the displacement difference of the marked three points decreases and the warped curvature increases.     

不同消毒方式供水管网中消毒副产物的分布特征

针对我国东南沿海地区4个使用不同类型二次消毒剂（氯、氯胺、二氧化氯）的局部管网水样的中三卤甲烷（THMs）、卤乙酸（HAAs）、卤乙腈（HANs）的分布特征及影响因素进行了分析。结果表明，3座城市DBPs的超标风险整体较低，采集的117份水样中有10份水样THMs超过国标限值，其余DBPs均符合标准。以氯为消毒剂的管网水样中THMs浓度和HANs浓度远高于其他管网，以二氧化氯为消毒剂可以减少消毒副产物THMs的生成，但以氯胺为消毒剂的上海地区HAAs浓度较高，是其他3个系统的5~19倍，可能与原水中HAAs前体物含量较高有关。在SH-NH?Cl系统中，消毒剂浓度与输配距离成反比（r = -0.57），同时该系统中硝酸盐、亚硝酸盐及氨氮浓度也随距离变化，说明饮用水在管网输送过程中余氯被逐渐消耗，同时管网中发生了硝化反应，氨氮被氧化为亚硝酸盐和硝酸盐。WJ-Cl₂系统中DBPs与输配距离相关，HANs浓度沿程减少（r = -0.49），HAAs浓度沿程增加（r = 0.45）。此外，建筑管网中长停滞时间也会影响水样理化指标。该研究揭示了不同类型二次消毒剂的管网水中DBPs浓度水平和变化规律，研究结果可为不同地区水质安全评价和风险控制提供依据。     

An Analysis of the Kinetic Features of Scissor Elevator Mechanism and Its Optimized Design

A mathematical model has been established for the research on scissor elevator for ship passenger stairs.The kinematical and kinetic simulation analyses were carried out with MATLAB/Simulink.The relative kinetic relation between hydraulic cylinder and other parts,as well as its rules of change has been found.A 3-D model of ship scissor elevator was established with Pro/E.The design of the mechanism was optimized in Pro/MECHANICA based on the findings from simulation analysis.Practice has proved that the design is scientific and reasonable and could serve as the theoretical guidance and reference for the design of scissor mechanism of other uses.     

基于改进滑模变结构的加筋板振动控制研究

针对外部持续激励下加筋板振动滑模变结构控制系统进入稳态的时间较长,且存在抖振现象的问题,在传统幂次、指数趋近律的基础上,构建新的自适应因子,形成了一种改进趋近律滑模变结构控制算法,并证明其收敛性.分析3种不同趋近律对系统振动控制的效果,仿真和实验结果表明,改进后的方法取得了比传统滑模变结构算法更优的控制效果,能在一定程...     

光诱导溴代乙酰氯α和β选键解离的CASSCF和MR-CI研究

光诱导选键解离的支化率问题是物理化学领域的一个挑战性课题，引起了实验和理论工作者的广泛关注. 对于不同的单键解离，其速率公式中指前因子相差不大，统计过渡态理论预测具有最低能垒的反应是主导反应. 但是，很多研究已经证明一些其他的因素能够影响支化率. 溴代乙酰氯（BrCH2COCl）有2个不同的羰基α键和一个较弱的β键，是研究光诱导选键反应的一个极好的例子.     

东南景天组培苗对锌、镉及其复合污染土壤的修复效能分析

东南景天（Sedum alfredii Hance）是一种典型的Zn、Cd、Pb的超积累植物,也是一种极佳植物修复材料．本文采用盆栽实验方法,研究东南景天组培苗在几种不同Zn、Cd污染土壤上的生长情况,及其对土壤Zn、Cd的去除效果．预期研究结果可为今后利用东南景天组培苗治理Zn、Cd污染提供一些理论依据．取得主要研究结果:1）东南景天组培苗完整地保留了扦插苗对于重金属的耐受性,并且对于高质量分数的Zn、Cd的环境适应性更强．在3#污染土壤（w（Zn）约2 000 mg·kg?1）中,组培苗地上部分生物量是对照组的2.3倍;在4#污染土壤（w（Cd）约1344 mg·kg?1）中,组培苗地上部分生物量相比于对照组的生物量增加了16.4%．2）东南景天组培苗对复合污染土壤中的Zn、Cd有很强的吸收积累能力．在1#和2#复合污染土壤中,组培苗对Zn的富集系数分别达到9.69和11.09,对Cd的富集系数分别达到12.67和85.36．3）复合污染土壤中的Zn、Cd会发生一定的交互作用,从而影响东南景天组培苗对Zn、Cd的吸收和富集．土壤中低质量分数的Cd会促进植物对Zn的吸收,但Zn却会抑制植物对Cd的吸收富集．此外,生长在复合污染土壤中的东南景天组培苗体内Zn、Cd重金属的分布也会受到影响．      

五味子淫羊藿混合物提取工艺及其抗疲劳作用研究

目的研究五味子与淫羊藿混合提取物(mixed Schisandra-Epimedium extract,MSEE)的最佳提取工艺,并观察其抗疲劳功效.方法采用加热回流提取法对五味子、淫羊藿进行混合提取,用正交实验法观察乙醇浓度(65%,70%,75%)、提取温度(60,65,75℃)、提取时间(1,1.5,2 h)及料液比(1∶10,1∶14,1∶18)对提取工艺的影响,并对提取物中五味子醇甲及淫羊藿苷含量进行分析,从中优选出最佳提取工艺.选取雄性ICR小鼠80只,随机分成空白对照组及150,300和600 mg/kg MSEE组,每组20只.给药30 d后,每组随机选取10只小鼠进行力竭游泳实验,记录小鼠力竭游泳时间.其余10只小鼠游泳90 min后处死,取血及肝组织,检测血清尿素氮及肝糖原水平.结果五味子与淫羊藿混合提取物最佳提取工艺:乙醇浓度为70%,提取温度为75℃,提取时间为1.5 h,料液比为1∶14.与空白对照组比较,300和600 mg/kg MSEE组小鼠力竭游泳时间均明显延长(P0.01);300和600 mg/kg MSEE组小鼠的血清尿素氮水平明显降低,而肝糖原水平则明显升高(P0.05或P0.01).结论得到MSEE最佳提取工艺,MSEE具有抗疲劳作用,可为开发具有抗疲劳功能的保健食品提供依据.     

<Emphasis Type="Italic">H</Emphasis><Subscript>∞</Subscript> control for nonlinear stochastic Markov systems with time-delay and multiplicative noise

This paper is concerned with the H_∞ control problem for a class of nonlinear stochastic Markov jump systems with time-delay and system state-, control input- and external disturbancedependent noise. Firstly, by solving a set of Hamilton-Jacobi inequalities (HJIs), the exponential mean square H_∞ controller design of delayed nonlinear stochastic Markov systems is presented. Secondly, by using fuzzy T-S model approach, the H_∞ controller can be designed via solving a set of linear matrix inequalities (LMIs) instead of HJIs. Finally, two numerical examples are provided to show the effectiveness of the proposed design methods.     

Discrete-time mean-field stochastic <Emphasis Type="Italic">H</Emphasis><Subscript>2</Subscript>/<Emphasis Type="Italic">H</Emphasis><Subscript>∞</Subscript> control

The finite horizon H ₂/H _∞ control problem of mean-field type for discrete-time systems is considered in this paper. Firstly, the authors derive a mean-field stochastic bounded real lemma (SBRL). Secondly, a sufficient condition for the solvability of discrete-time mean-field stochastic linearquadratic (LQ) optimal control is presented. Thirdly, based on SBRL and LQ results, this paper establishes a sufficient condition for the existence of discrete-time stochastic H ₂/H _∞ control of meanfield type via the solvability of coupled matrix-valued equations.