课外教育活动是学校教育的有机组成部分,担负着一定的教育任务。要全面贯彻党的教育方针,落实《课程计划》的要求,单凭课堂教学这个主渠道是不够的,还必须根据学生实际和学科
The porphyrin-like macrocycles and their metal complexes are s novelfamily of photoresponsive molecules.The properties of the excited states,bothsinglet and tri
为进一步改善原料结构,增强企业参与未来国际市场竞争的实力,晨鸣集团从长远发展的战略角度出发,把原料基地建设作为一项重要的措施,提出并开始实施了“林纸一体化”战略,其
The preparation, characterization and properties of titania overlayer on Fe(110) substrate is hereby reported. The TiO_X overlayer was found to form in a layer-
研究稀土异戊橡胶（NdIR）／天然橡胶（NR）并用胶的性能，并与NR进行对比。结果表明：NdIR／NR并用胶混炼工艺性能、硫化特性和流变性能与NR胶料相当；NdIR／NR并用胶物理性能、耐热空气老化性能
A calcium ion-setective eletrode based on a new neutral carrier was studied.The electrode givesa Nernstian response in the rang 5.9-1 Pa and the response is sta
1, 1’--Bis(benzylseleno)ferrocene and its platinum complex were synthesized. Itwas found that the platinum complex was efficient catalyst for the hydrosilylati
Squamostatin-B (1), a new polyketide or acetogenin, has been isolated from Annona squamosa L. (Annonaceae). Its structure and relative atereochemistry were eluc
The intermolecular reaction of carboxylic derivativeswith nitro compounds induced by titanium tetrachloride and zinepowder was studied.