各种添加剂对低温陶瓷结合剂性能的影响

实验主要研究6种添加剂对陶瓷结合剂性能影响。实验证明,随着α-Al2O3加入量的增多,结合剂的熔点逐渐升高,在加入量为15%时流动度最好;CuO、Cr2O3和Zn对结合剂熔点有明显的提高作用;Sn和Cu可以降低结合剂的熔点;加入8%Cr2O3或加入6%Sn时其流动度值最佳。     

高炉喷吹煤粉的粉体流动性与煤质相关性

利用Carr粉体流动指数法评价高炉喷吹煤粉的流动特性及喷流特性,研究了煤岩显微组分、变质程度等煤质特性对高炉喷吹煤粉流动性的影响.研究发现,流动特性与喷流特性几乎呈负相关.煤变质程度对煤粉流动特性及喷流特性都有显著影响.变质程度低的烟煤,流动特性差,喷流特性好;变质程度高的无烟煤,流动特性好,喷流特性差.镜质组体积分数为60%～70%时,流动特性指数较差;体积分数在83%～95%,由于影响因素较多,流动特性与镜质组没有相关性.丝质组与喷流特性正相关,与流动特性负相关.矿物质与煤粉流动性无相关性.     

同步注浆浆液流动性指标适用性对比试验研究

浆液流动性指标试验方法对不同性质浆液的适用性存在差异,多种流动性指标与试验方法的组合运用能够准确、合理地反映浆液的经时变化。通过稠度试验、孔道压浆流动度试验和胶砂流动度试验,对常规快硬型单液活性浆液的流动性指标进行了对比试验量测,探讨了不同的试验方法对浆液流动性的适用性和合理性,分析了浆液流动性的经时变化,提出了浆液流动性指标的控制范围,为盾构同步注浆施工提供参考。     

颜料对聚合物水泥砂浆性能的影响

向聚合物水泥砂浆中掺入氧化铁颜料制备彩色聚合物水泥砂浆,研究了不同颜料及其掺量的变化对聚合物水泥砂浆力学性能、工作性能和粘结强度的影响,并借助扫描电镜(SEM)表征了彩色聚合物水泥砂浆的微观组织形貌。结果表明：颜料会一定程度降低聚合物砂浆的抗折、抗压强度,且颜料掺量为5%时,对聚合物砂浆的抗折、抗压强度影响显著,随着颜料掺量的逐渐增加,聚合物砂浆的抗折、抗压强度呈现先增加后平缓的趋势;聚合物砂浆的流动度和粘结强度随颜料掺量的增加而减小;SEM测试结果表明颜料一方面会包裹水泥颗粒,阻碍水泥水化,降低彩色聚合物砂浆的抗折、抗压强度,但另一方面颜料能有效填充聚合物砂浆空隙,改善密实度,提高聚合物砂浆的抗折、抗压强度。     

A1/TiC复合材料铸造流动性的研究

通过实验研究了基体Al合金和TiC颗粒含量不同的四种Al／TiC复合材料的流动性．并根据流动性的差异,提出了不同的铸造工艺成型方法．     

Effects of free sterols on the fluidity of polar lipids in rice dry embryo

Free sterols from rice dry embryo reduce the onset phase transition temperature and widen the transition range of total polar lipids and phosphatidylglycerol, which increases the membrane fluidity below their phase transition temperature and decreases the fluidity of membranes above their phase transition temperature. And 50% of free sterols result in a complete disappearance of phase transition. The fluidity of other main components of polar lipids is decreased by free sterols above 0℃. The results confirm that free sterols can modulate membrane lipid fluidity.     

鼻粉剂四种常用辅料的物理性质考察

作为可以经鼻黏膜给药进脑发挥药效的新剂型———鼻粉剂近来日益受到关注。通过对四种常用辅料的物理性质,包括吸湿性、流动性和喷流性进行考察,可初步为鼻粉剂进一步的处方筛选提供参考。     

Statistical study of cement additives with and without chloride on performance modification of Portland cement

The effectiveness of cement additives with and without chloride on the fluidity and the strength development of Portland cement was compared by using statistical full factorial design.The experimental results show that the cement additive containing CaCl_2 and Ca(NO_3)_2 can enhance early strength of cement significantly.However,Ca(NO_3)_2 is less effective than CaCl_2 even if it is combined with other organic chemicals such as alkanolamine and saccharide.No significant difference is found between CaCl_2...     

Endogenously generated amyloid β increases membrane fluidity in neural 2a cells

The effect of endogenously generated amyloid β on membrane fluidity was investigated in Neural 2a cells stably expressing Swedish mutant amyloid precursor protein (APPswe). Membrane fluidity was studied by fluorescence polarizability using 1,6-Diphenyl-1,3,5-Hexatriene (DPH) as the fluorescence probe. It was found that the membrane fluidity in APPswe cells was significantly higher than that in its wild type counterparts. Alleviating the effect of amyloid β either by γ secretase activity inhibition or by amy...     

糖尿病患者红细胞膜流动性及其影响因素的探讨

探讨糖尿病患者红细胞膜流动性及其影响因素,方法对４３例受试者的红细胞膜流动性,脂质过氧化物终产物丙二醛、血清胆固醇、血清甘油三脂和维生素Ｅ进行测定分析。结果：糖尿病组与健康对照组比较,前者是红细胞膜流动性和血清ＶＥ含量显著降低（ｔ＝５．４５３、２．３３９,Ｐ〈０．０１）;血浆丙二醛、血清胆固醇、甘油三脂含量升高,两者比较有显著性差异（ｔ＝３．０２６、２．３８２、２．９６５,Ｐ〈０．０５）。结论：糖