几年前,我在某乡挂职任乡党委副书记时,认识了一位青年农民。那时他刚刚承包了村里的采石场,贷了一笔款,请来了技术员,雄心勃勃,准备大干一场,力争在3年内脱贫致富。他有文化
A new layered zincophosphate was synthesized under solvothermal conditions by employing racemic 1,2-diaminopropane as the structure-directing agent. The structu
The treatment of bis(2-hydroxybenzyl)-amine(HL) with NaOH and Co(Ⅱ)(NO)2 gives isostructural one-dimensional coordination polymers [(NaOC2H5)CoL2]n(1). The cob
[1]Robson, R. , Abrahams, B. F. , Batten, S. R. et al. , Supramolecular Architecture, American Chemical Society, Washington, DC, 256(1992)[2]Aakeroy, C. B. , Se
The binding mode of the amino acid ethyl esters(guest) by 5-(2-carboxylphenyl)-10,15,20-triphenylporphyrinatozinc(Ⅱ)(host 1) was studied by means of 1H NMR spe
Each of Keggin type heteropolytungstosilicic and heteropolytungstogermanic acids reacted with 8-quinolinol, p-aminodimethylaniline and pyridine, respectively, y
Nanocrystallite δ′-ZrW1.6Mo0.4O8 was prepared in the precursor route synthesis. The characterization by means of powder X-ray diffraction (XRD) and selected a
开发了数字控制系统以实现对调焦系统的闭环控制，并对调焦精度做出分析，得出了实验考察环境因素对调焦精度的影响；搭建了一套调焦系统，分析调焦原理得出系统控制模型．利用LABVIEW
通过在沈阳农业大学综合试验场内构建小试装置模拟盘锦双台河口盐碱化湿地,取用流经湿地的造纸废水进行灌溉,研究造纸废水灌溉后湿地土壤Na＋含量的变化,分析废水灌溉对湿地土
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