水果电池的研究

采用不同种电极和不同水果，用不同浓度的同种水果汁组成浓差原电池．探索水果浓差电池的物理化学性能如电导率、黏度、旋光度、糖度、折光率以及产生的电压、电流值，结果表明：用水果组成的电池物理化学性能同电池产生的电压、电流具有一致的规律性，水果电池具有较高的电压、电流值。     

矩阵可逆的几种判断方法

矩阵是研究线性代数的一个重要的工具，矩阵可逆则是矩阵理论的一个重要内容。如何判断矩阵可逆，本义总结了如下几种常用的方法：     

新型电池材料充电仅需2分钟

韩国蔚山科学技术大学和LG化学技术研究院电池研究所8月15日发表声明称,开发出了2分钟内完成充电或者放电的充电电池（Secondary Battery）电极用的新材料。     

用马氏链的击中时分布刻画一类矩阵的特征值

对于给定的具有可逆马氏链的Q-矩阵,在构造其可逆马氏链的基础上,通过增加一个状态来构造一个新的可逆马氏链,然后利用增加状态的击中时分布,刻画了Q-矩阵的全部特征值,并给出了数例．     

可逆热致变色木塑复合材料的制备及性能表征

为探究木塑复合材料（ WPC）的可逆热致变色功能，以原位聚合法合成了表面带有硅烷偶联剂KH550的可逆热致变色结晶紫内酯微胶囊，并将该微胶囊以一定比例添加到WPC中，制备了可逆热致变色WPC，通过力学性能和加热前后表观颜色测定确定微胶囊的最佳添加量。同时，通过动态热机械分析对比了可逆热致变色WPC和普通WPC的动态力学性能。随着微胶囊添加量的增加，可逆热致变色WPC的拉伸强度和弯曲强度先增大后减小，加热前后颜色变化逐渐明显，最后趋于稳定；在动态热机械分析方面，随着温度升高，可逆热致变色WPC和普通WPC的储能模量逐渐降低。和普通WPC相比，加入最佳添加量的微胶囊制备的可逆热致变色WPC在同一温度时的储能模量高于普通WPC，2种WPC的损耗因子峰对应的温度相差很小。结果表明，当微胶囊的添加量为总质量的15％时，可逆热致变色WPC兼具良好的力学性能和可逆热致变色功能，和普通WPC相比，可逆热致变色WPC的界面相容性较好，力学性能优良，且具有与普通WPC相近的玻璃化转变温度，是一种良好性能的功能型WPC。     

基于ARM和CAN的电动汽车电池管理系统

介绍了利用嵌入式技术和CAN总线技术设计的电动汽车电池管理系统.电池监控节点以AVR单片机为核心,包括电池参数采集模块、CAN通讯模块、串口通讯模块等.各电池监控节点之间通过CAN总线进行通讯,主节点与上位机之间通过串口通讯.利用S3C44B0X开发板搭建了上位机管理平台,移植了实时操作系统uC/OS-Ⅱ,并将uC/GUI应用于触摸屏,实现了良好的人机交互.电池管理系统可以实现对各个电池电流、电压和温度的实时采集,并在触摸屏上显示,同时可通过触摸屏发送控制指令给各监控节点.经过电池标定试验验证系统是可行的.     

Hilbert空间中渐近非扩张型半群殆轨道的强遍历收敛定理

利用具等距的渐近殆非扩张曲线的遍历定理,研究了非Lipschitzian右可逆半群的殆轨道,得到了右可逆半 群渐近非扩张型半群殆轨道的强遍历收敛定理,将已有的结果进行了推广.     

别样收藏

手机、手电、手表、电脑,当今时代连小孩的鞋底儿都得塞两块电池。中国每年生产的电池就有180多亿只,占世界电池年产量的30%以上。在国内,电池的年消耗量就达70亿～80亿只。     

电动车电池保养六招

电动车电池是决定电动车行使里程长短的重要因素.那么平时保养电动车电池应该注意哪些问题呢?     

电池的选购和使用小常识

如何选购电池： 1．选购有“国家免检”、“中国名牌”标志的电池产品和地方名牌电池产品。     

亚甲蓝在玻碳电极上的电化学行为研究及测定

研究了亚甲蓝在玻碳电极上的电化学行为,对电极氧化还原机理进行了讨论。亚甲蓝在玻碳电极上能够发生可逆的氧化还原反应,其单扫和多扫循环伏安图保持一致,在电极上的反应是扩散控制的过程。用方波伏安法对其测定条件进行了优化,在最佳测定pH=7．0的B—R缓冲溶液中,亚甲蓝的浓度与氧化峰电流在3．0×10 -6～9．0×10 -5 mol／L范围内呈线性关系,检出限为1．0×10 -6mol／L.     

基于四(5,6 二氢1,4 二噻英) 四氮杂卟啉修饰玻碳电极对多巴胺的选择性检测

将四(5,6-二氢-1,4-二噻英)四氮杂卟啉(FePz(dtn)4)通过电沉积的方式固载在玻碳电极上,该电极在抗坏血酸(AA)和尿酸(UA)等干扰物存在下,可选择性地检测多巴胺(DA).对比裸电极,在循环伏安测量中修饰过后的电极在氧化电位处对DA表现出良好的电催化活性.并且出现一对可逆的氧化还原峰,阳极和阴极的电位值分别为0.182V和0.142V.在电解质溶液中氧化峰电流随着DA的浓度线性增加.两个线性范围分别是1～10和10～200μg/mL,相关系数分别为0.996 7和0.998 8.检出限为0.3μg/mL.     

Field-Induced Layering of Colloidal Crystals

An electrohydrodynamic methodology has been developed that makes possible the precise assembly of two- and three-dimensional colloidal crystals on electrode surfaces. Electrophoretically deposited colloidal particles were observed to move toward one another over very large distances (greater than five particle diameters) to form two-dimensional colloidal crystals for both micrometer- and nanometer-size particles. This coalescence of particles with the same charge is opposite to what is expected from electrostatic considerations and appears to result from electrohydrodynamic fluid flow arising from an ionic current flowing through the solution. The ability to modulate this "lateral attraction" between particles, by adjusting field strength or frequency, facilitates the reversible formation of two-dimensional fluid and crystalline colloidal states on the electrode surface. Further manipulation allows controlled structures to be assembled.     

多酸修饰电极对深色果蔬中维生素C的测定

【目的】制备磷钼酸复合膜修饰电极,并对其电化学性质和果蔬维生素C含量的测定进行相关探究,为深色果蔬中维生素C的测定提供理论依据。【方法】利用电化学沉积法在E=+0.26 V恒电位下制备磷钼酸复合膜修饰电极,并在不同条件下对其电化学性质进行检测,再以水果和蔬菜为研究对象,检验磷钼酸复合膜修饰电极对维生素C含量测定的效果。【结果】制备所得的磷钼酸具有稳定的Keggin结构;磷钼酸修饰后的电极在-0.4~+0.6 V内具备可逆的氧化还原峰;磷钼酸复合膜修饰电极的电催化能力与磷钼酸浓度呈正相关,且在高酸环境中电化学催化能力更强;该修饰电极对维生素C的氧化催化活性较明显,氧化催化活性随磷钼酸氧化程度和扫速的增加而提高,在连续增加维生素C浓度的过程中,修饰电极能快速响应维生素C,最短响应时间仅需3 s;以该电极为工作电极检测获得橙子、胡萝卜和青椒3种样品维生素C含量分别为45.32、71.16和96.99 mg/100 g,3次测定结果平均值的相对标准偏差（RSD）均未超过5.0%,且最低检测限为1.1×10-8 mol/L（S/N=3）。【结论】磷钼酸复合膜修饰电极的氧化催化活性良好,对深色果蔬维生素C的检测具有灵敏度高、检出限低和测定结果误差较小等特点。     

Chemical detection with a single-walled carbon nanotube capacitor

We show that the capacitance of single-walled carbon nanotubes (SWNTs) is highly sensitive to a broad class of chemical vapors and that this transduction mechanism can form the basis for a fast, low-power sorption-based chemical sensor. In the presence of a dilute chemical vapor, molecular adsorbates are polarized by the fringing electric fields radiating from the surface of a SWNT electrode, which causes an increase in its capacitance. We use this effect to construct a high-performance chemical sensor by thinly coating the SWNTs with chemoselective materials that provide a large, class-specific gain to the capacitance response. Such SWNT chemicapacitors are fast, highly sensitive, and completely reversible.     

Modulation of the metastatic capability in B16 melanoma by cell shape

The lung colonization of B16-F1 cells grown in flat and spherical configurations was studied. Cells cultivated in vitro as spheroids on a nonadhesive substrate expressed in a reversible fashion a marked increase in their propensity to establish metastases. The altered metastatic capability was accompanied by a reversible reduction in the accessibility of cell surface proteins to external iodination and by a dramatic decrease in the synthesis of vimentin.     

Surface charge--induced ordering of the au(111) surface

Synchrotron surface x-ray scattering (SXS) studies have been carried out at the Au(lll)/electrolyte interface to determine the influence of surface charge on the microscopic arrangement of gold surface atoms. At the electrochemical interface, the surface charge density can be continuously varied by controlling the applied potential. The top layer of gold atoms undergoes a reversible phase transition between the (1 x 1) bulk termination and a (23 x radical3) reconstructed phase on changing the electrode potential. In order to differentiate the respective roles of surface charge and adsorbates, studies were carried out in 0.1 M NaF, NaCl, and NaBr solutions. The phase transition occurs at an induced surface charge density of 0.07 +/- 0.02 electron per atom in all three solutions.     

微生物燃料电池研究进展

首先介绍了微生物燃料电池的基本原理,然后从电池结构、产电微生物、电极等方面分析影响电池性能的各参数之间的关系,最后对其发展趋势进行分析和展望。     

A reversible and higher-rate Li-O2 battery

The rechargeable nonaqueous lithium-air (Li-O(2)) battery is receiving a great deal of interest because, theoretically, its specific energy far exceeds the best that can be achieved with lithium-ion cells. Operation of the rechargeable Li-O(2) battery depends critically on repeated and highly reversible formation/decomposition of lithium peroxide (Li(2)O(2)) at the cathode upon cycling. Here, we show that this process is possible with the use of a dimethyl sulfoxide electrolyte and a porous gold electrode (95% capacity retention from cycles 1 to 100), whereas previously only partial Li(2)O(2) formation/decomposition and limited cycling could occur. Furthermore, we present data indicating that the kinetics of Li(2)O(2) oxidation on charge is approximately 10 times faster than on carbon electrodes.     

Mitotic arrest by deuterium oxide

In marine invertebrate eggs, where cell divisions occur without growth, deuterium oxide produces arrest of, or serious delay in, mitosis and cytokinesis. All stages requiring assembly or operation of mechanical structures in the cytoplasm are sensitive to D.O. The block is reversible in some cells.