掺矿渣复合水泥基材料硬化浆体中Ca(OH)_2含量的变化规律

采用热重法测试了不同矿渣掺量复合水泥基材料硬化浆体至2a时各龄期的Ca(OH)_2含量,并计算相对于复合水泥基材料中水泥质量分数的Ca(OH)_2含量,形成掺矿渣复合水泥基材料硬化浆体中Ca(OH)_2含量变化规律。研究结果认为矿渣早期反应消耗部分Ca(OH)_2,而后期不再消耗Ca(OH)_2,矿渣反应不同阶段对Ca(OH)_2的消耗是不一致的。因此不能根据早期矿渣反应消耗Ca(OH)_2的量来预估长龄期时掺矿渣复合水泥基材料中Ca(OH)_2的含量。     

幼儿园集体语言教育活动中的常见问题及其解决策略

当前幼儿园集体语言教育活动中存在诸多问题,突出表现为对语言教育重视不够;教师的教学语言示范性不足、有效性欠缺;教师只追求教学活动的顺利完成,忽视了幼儿语言运用能力的发展和创新思维的激发;教师运用有效提问策略水平较低。主要解决策略是树立正确的语言观、发展观及教育观;内外兼修,提升幼儿教师语言素养;增强对幼儿的敏感度,真正做到以幼儿发展为本;学习、研究有效提问策略,增强课堂教学的实效性。     

1950MHz GSM-Talk信号对睾丸支持细胞增殖和分泌功能的影响

采用贴壁生长的小鼠睾丸支持细胞（TM4）在含10％胎牛血清的DMEM／F121：1培养液中培养至指数生长期后,消化制备成1．5×10^3个·mL^-1的细胞悬液,接种于35mm培养皿中,每皿接种3mL,接种12个皿。细胞接种后24h更换新鲜培养液,然后将培养皿随机分为假辐照组和辐照组,每组6个皿。将2组细胞分别置于辐照装置的2个小室中,其中一个小室产生GSM-Talk信号,1950MHz连续波,比吸收率为3W·kg^-1,辐照时间为5d;另一个小室不产生GSM信号,用于假辐照。辐照结束后1-5d,采用CCK-8和BrdU法检测细胞的增殖情况,免疫荧光染色检测细胞增殖标记物Ki67的蛋白表达,ELISA法检测小鼠干细胞因子（SCF）和小鼠胶质细胞系来源的神经生长因子（GDNF）的水平。结果显示：与对照组相比,辐照组TM4细胞的增殖能力明显减弱佃〈0．05）,细胞增殖标记物Ki67的表达亦有减弱趋势,细胞上清中SCF水平明显降低p〈0．05）,而GDNF水平明显升高（p〈0．05）。实验结果提示,GSM-Talk连续辐照5d可抑制TM4细胞的增殖并影响其分泌功能。     

毛竹的主要化学成分分析及热解

In recent years, great attention has been paid to the exploitation and use of biomass energy.Using bamboo as the raw material to produce energy and other chemicals is significantly important. A primary study was made on the pubescens, one kind of bamboo distributed broadly in China with fast growth rate. The contents of cellulose, hemi-cellulose, and lignin in different parts of pubescens with different growth ages, as major components of the cell wall, were determined. The analysis procedures were as follows, firstly the substances other than the above mentioned three were removed chemically,then the hydrolyzed cellulose liquid was oxidized with excess oxidants, and at last titrated. Pubescens powder was packed into the quartz tube reactor, then was heated from room temperature to 300, 350,400, 450, 500, 550℃ and 600℃ respectively in flowing N2. Pyrolysis was held at the final temperature for 10 h. The liquid products were analyzed with GC/MS. The main products in the liquid obtained were.acetic acid, 2,6-dimethoxy phenol, 2,3-dihydrobenzofuran, etc. The pyrolysis temperature exerted great effect on the composition of the liquid products. The distribution of the products could be regulated by controlling pyrolysis temperature.