苜蓿对免耕玉米田杂草萌发和生长影响的研究

通过对免耕玉米田的杂草种子进行室内培养研究,初步探讨了苜蓿根浸提液和根际土浸提液对杂草萌发和生长的化感作用。结果表明:苜蓿根浸提液和根际土浸提液能够显著抑制萝摩和山莴苣的萌发;苜蓿根际土的乙醇浸提液能够显著抑制萝摩、无芒稗和山莴苣幼苗的生长。研究结果为在免耕玉米田引入外源绿肥植物控制杂草提供了依据。表3,参15。     

电导分析法测定钢铁含硫的初步探讨

本文阐述了电导分析法测定钢铁含硫的原理,在多次试验的基础上提出了分析方法,并对影响电导分析的因素作了理论探讨。     

共沉淀法净化铜电解液中砷锑铋的研究

本文研究了用高锰酸钾与硫酸锰生成水合二氧化锰的方法,从铜电解液中共沉淀有害于电积铜杂质元素:砷锑铋的工艺过程,对主要工艺参数进行优化研究,从而得出该工艺过程的最佳工艺条件。     

Preparation and characterization of a novel composite microporous polymer electrolyte for Li-ion batteries

A novel composite microporous polymer electrolyte composed of poly（vinylidene fluoride-co-hexafluoropropylene） （PVdF-HFP） and mesoporous SBA-15 was prepared. The composite solid polymer electrolyte （CSPE） exhibits ionic conductivity as high as 0.30 mS·cm^-1 with a composition of SBA-15 ： PVdF-HFP=3 ： 8 at room temperature. Infrared transmission spectroscopic results suggested that the mechanism of micropore formation is similar to that of the phase inversion. X-ray diffraction （XRD） results demonstrated that the addition of SBA-15 inhibits the crystallization of PVdF-HFP, while the SBA-15 preserves well its ordered mesoporous structure during the course of preparation. The Li/CSPE/MCF of half-cell was assembled, and it showed a good electrochemical and cyclability performance during charge-discharge cycles.     

Effect of organic-inorganic hybrid P123-em-SBA15 on lithium transport properties of composite polymer electrolyte

A novel PEO-based composite polymer electrolyte by using organic-inorganic hybrid EO20PO70EO20-em-mesoporous silica (P123-em-SBA15) as the filler has been developed. The experiment results show that P123-em-SBA15 can enhance the lithium-ion transference number of the composite polymer electrolyte, which is induced by the special topology structure of P123 in PI23-em-SBAI5 hybrid. In addition, room temperature ionic conductivity of the composite polymer electrolyte can also be increased by about two orders of magnitude. The excellent lithium transport properties suggest that PEO-LiCIO4-P123-em-SBA15 composite polymer electrolyte can be used as electrolyte materials for all solid-state rechargeable lithium polymer batteries.     

Optimization of polymer electrolytes for quasi-solidstate dye-sensitized solar cells

The dye-sensitized nanocrystalline TiO2 thin filmsolar cells (DSSCs) have attracted much attention since1990s[1— , due to their high light to electrical energy 4]conversion efficiency. So far, many studies have beenmade on the use of liquid electrolytes such as acetonitrile,3-methoxypropionitrile and a mixture of ethylene/pro-pylene carbonate (EC/PC) containing I? /I3 redox cou-?ple. A light to electrical energy conversion efficiency of7%— 12% has been obtained for DSSC using liquid e…     

混合电解质溶液中NaCl活度系数的测定与计算

在25°下,用电动势法测定了 NaCl-Mg(NO_3)_2-H_2O、NaCl-Ca(NO_3)_2-H_2O、Nacl-Sr(NO_3)2-H_2O 体系中 NaCl 的平均离子活度系数,用简化的 Pitzer 计算公式从理论上进行了计算,实验值与理论值较接近.     

高压下弱电解质电离反应的研究

本文分别从化学热力学和化学动力学的角度对在水溶液中高压下进行的弱电解质电离反应加以探讨，说明了压力对该反应行为的影响规律，并从理论上对反应过程中的一些特征作了充分的解释，进一步证实了各物质偏摩尔体积的变化是导致反应过程中压力影响的主要因素。     

电化学法快速测定铁水中的硅量

采用以ZrO_2(MgO)固体电解质,配以一新辅助电极SiO_2+CaF_2的方法,对Fe+C(sat)+Si体系进行了测量。结果表明:当硅测头插入铁水5s以后电动势值即可达到稳定值;电动势与硅量的关系符合理论公式;T=1694～1749K,电动势随温度的变很小。本研究所开发的硅测头具有响应迅速、准确,可望在现场得到应用推广。     

Solid State Polymer Electrolytes for Dye-sensitized Solar Cell

1 Introduction Over the past decade,Dye-sensitized solar cells (DSSCs) have been intensively investigated as potential alternatives to conventional inorganic photovoltaic devices due to their low production cost and high energy conversion[1-4]. This type of solar cell has achieved an impressive energy conversion efficiency of over 10%,whose electrolyte is a voltaic organic liquid solvent containing iodide/triiodide as redox couple.However,the use of a liquid electrolyte brings difficulties in the practi...