导电聚合物的导电机理及制备方法

导电聚合物是20世纪70年代发展起来的一个研究领域,因其诱人的应用前景受到广泛重视。导电聚合物材料与对应的无机材料相比,具有成膜性好等优点,但也存在稳定性差等缺陷。如何进行结构设计克服现有的缺点、实现导电聚合物的大规模应用是当前导电聚合物界努力的方向。导电聚合物当前的研究热点是设计和合成结构高度稳定、高荧光量子效率和高电荷载流子迁移率的共轭聚合物序的导电聚合。     

微元步长自适应增量电导法实现MPPT的控制

为了更大程度的提高光伏发电系统的最大输出功率,通过对光伏电池功率、电压(P-U)特性的数学建模分析,在增量电导法的基础上,提出最大功率跟踪控制算法(MPPT)——微元步长自适应增量电导法.改善了传统增量电导法步长选择不确定性的弊端.通过引入变步长控制因子k,以微元步长Δd自适应的跟踪最大功率点.在Matlab/Simulink环境下进行了仿真验证.结果表明该算法明显缩短了跟踪时间,并且有效地抑制了系统在最大功率点(MPP)附近的振荡现象,提高了系统的跟踪速度和精度.     

GLC并联电路暂态过程衰减系数的能耗分析

分析了GLC并联电路欠阻尼振荡衰减系数的实验测量值与理论值偏差的原因,以振荡衰减的实验波为基础,测算出电路电容和电感上的损耗电导。对衰减系数的理论值进行修正,可使衰减系数理论修正值与实验测量值基本一致。     

同轴传输线的电特性研究

探讨了在介质漏电情况下，同轴传输线中的电流分布，指出电流和电是随空间变化的，当介质的电导率为０时，ω＝０，传输线电流Ｉ为常量，并计算出无限长同轴传输线的电阻Ｒ＝（Ｒ１＋Ｒ２）／ω及有限长同轴传输线的电阻Ｒｔ，Ｒ称为同轴传输线的特征电阻。     

陕甘宁异地水氡含量与电导关系

分析研究了已经报导的陕（西）甘（肃）宁（夏）异地水氡、土氡含量的变化，发现水氡含量随着水的电导值增大而增加，且呈现出良好的线性关系。即Ｑ＾（１）Ｒｎ＝－１．３３８５＋０．０１Ｇ其中Ｑ＾（１）Ｒｎ表示水氡含量，以Ｂｑ／Ｌ为单位；Ｇ为水的电导值，以μＳ／ｃｍ为单位，此式的线性相关系数ｒ＝１．０００，由此式所得计算结果与实验值的相对误差小于６．１０％。     

植物试管苗移栽过程中气孔开度的变化研究

用分步炼苗法，对烟草，草梅栝楼的试管苗进行了开口光锐、沙培和室外营个步骤的炼苗；     

基于连通导电理论和HB方程的骨架导电纯岩石电阻率模型

针对现有导电模型很难描述骨架含导电矿物黄铁矿的岩石导电规律的难题,利用骨架完全由导电颗粒组成的人造岩样以及骨架部分由导电颗粒组成的天然和人造岩样的岩电实验数据,研究水电阻率和导电颗粒体积分数变化对岩石导电规律的影响,得出骨架导电纯岩石的地层因素与孔隙度及电阻增大系数与含水饱和度在双对数坐标上为非线性关系,随水电导率减小或导电颗粒体积分数增大,地层因素和电阻增大系数值降低。根据骨架导电纯岩石的组成,结合连通导电理论特点,将骨架导电纯岩石分为不导电骨架相、导电骨架相和自由流体相。基于连通导电方程只能描述单一导电相的两相混合介质导电规律而HB方程能描述两相均导电的混合介质导电规律的特点,基于连通导电理和HB方程建立骨架导电纯岩石电阻率模型。结果表明,骨架导电纯岩石电阻率模型预测的地层因素与孔隙度以及电阻增大系数与含水饱和度的理论关系与实验规律相符且模型满足物理约束,该模型能够描述骨架完全和部分由导电矿物组成的纯岩石的导电规律,可用于定量评价骨架导电低阻油层的饱和度。     

人工光强下月季气孔导度的变化

在人工光强下，生长于市区的幼果期月季的气孔导度随光强的增加而下降，当达到一定光强之后趋于定值；山区的幼果期月季气孔导度随光强的增加而一直呈上升趋势，说明山区的月季对强光的适应性强于市区的月季．     

Rearrangements of microtubule cytoskeleton in stomatal closure of Arabidopsis induced by nitric oxide

NO (nitric oxide), known as a key signal molecule in plant, plays important roles in regulation of stomatal movement. In this study, microtubule dynamics and its possible mechanism in the NO signal pathway were investigated. The results were as follows: (i) In vivo stomatal aperture assays revealed that both vinblastine (microtubule-disrupting drug) and SNP (exogenous NO donor) prevented stomatal opening in the light, and vinblastine even could enhance the inhibitory effect of SNP, whereas taxol (a microtubule-stabilizing agent) was able to reduce this effect; (ii) microtubules in the opening Arabi- dopsis guard cells expressing GFP:α-tubulin-6 (AtGFP:α-tubulin-6) were organized in parallel, straight and dense bundles, radiating from the ventral side to the dorsal side, and most of them were localized perpendicularly to the ventral wall; (iii) under the same environmental conditions, treated with SNP for 30 min, the radial arrays of microtubules in guard cells began to break down, twisted partially and be- came oblique or exhibited a random pattern; (iv) furthermore, the involvement of cytosolic Ca2 in this event was tested. Stomatal aperture assays revealed that BAPTA-AM (a chelator of Ca2 ) greatly sup- pressed the effect of NO on stomatal closure; however, it did not show the same function on stomatal closure induced by vinblastine. When BAPTA-AM was added to the SNP-pretreated solution, the SNP-induced disordered microtubulue cytoskeleton in guard cells underwent rearrangement in a time-dependent manner. After 30 min of treatment with BAPTA-AM, the cortical microtubules resumed the original radial distribution, almost the same as the control. All this indicates that NO may promote rearrangement of microtubule cytoskeleton via elevation of [Ca2 ]cyt (free Ca2 concentration in the cy- toplasm), finally leading to stomatal closure.     

水蛭AP神经元突触部位分辨的电导调控机制

用神经节－体壁标本，揭示ＡＰ神经元对邻节机构感受神经元传入信号也具有部位分辨机能。