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报道了以茈为荧光探针,探讨小剂量~(60)Co γ射线照射后小鼠胸腺细胞膜流动性的变化。结果表明,剂量在0.25-1.00Gy范围,胸腺细胞膜流动性降低与剂量之间呈明显线性关系。从0.50Gy起,辐照组荧光强度比值I_1/I_2与I_3/I_2与对照组的比较存有显著差异(P<0.05)。提示淋巴细胞膜流动性的变化可作为小剂量辐照早期效应的敏感指标。 相似文献
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《矿业科学技术学报(英文版)》2016,26(4):571-575
The content and the caking index of the heavy,the dense medium and the loose medium components of coal,obtained by extraction and stripping with CS_2/N-methyl-2-pyrrolidinone mixed solvent(1:1 by volume),were studied and correlated with the caking property of raw coals.Images of the three group components after heat treatment were analyzed.The results show that both caking index(G) and maximum thickness of plastic layer(Y) of coals have a good linear relationship with the content of the medium component;the dense medium and the loose medium components are the two key factors to determine the caking property of raw coals-they are the source materials of fluidity and swelling of coal,respectively;the heavy component without the swelling and fluidity was cohered by the other components;two new indexes,which can extend current understanding of the caking properties,were introduced. 相似文献
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文章分析了重介选煤工艺中,悬浮液固相体积浓度与介耗之间的关系。结果表明悬浮液固相体积浓度过高,流动性差,产品介耗就高。其实质是悬浮液粘度大、煤泥含量大、分流量不合适等造成的。了解悬浮液固相体积浓度是判断流动性和指导介质分流大小的依据。 相似文献
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采用固定水胶比和固定流动度两种方案进行对比试验,研究了不同掺量的玄武岩纤维对复合磷酸镁水泥(MPC)砂浆流动度和力学性能的影响,并采用扫描电子显微镜(SEM)观察了微观形貌.结果表明:在固定水胶比的情况下,随着玄武岩纤维掺量的增加,MPC砂浆的流动度降低,但力学性能有所提高,且掺量为3.5 kg/m3时,力学性能最优,... 相似文献
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The addition of biomass to coking coals can reduce operational costs and carbon emissions but also reduces fluidity development. The use of heating rates up to 20 °C min−1 in the softening stage of coal has been investigated using high-temperature small-amplitude oscillatory-shear (SAOS) rheometry to improve the fluid characteristics of binary blends of two coking coals with Scots pine. The effects of biomass concentration and particle size, biomass torrefaction, pellet mass and thermal pre-treatment of the blend on fluidity development and semicoke strength have also been studied. Fluidity increased with an increase in heating rate and an increase in the final temperature for fast heating. Relationships were found between the minimum complex viscosity of the blend, the heating rate and the concentration of biomass, which have been used to propose an equation to calculate the heating rate necessary to achieve optimum fluidity for a particular blend with biomass. The fluid characteristics of the blend were not affected to a great extent by the particle sizes of the biomass studied (<500 μm and >500 μm) or the torrefaction of the biomass (250 °C for 1 h in N2), were increased by an increase in pellet mass, and were destroyed by blend pre-heating. The semicoke strength of the blend with a mass fraction of 10% Scots pine and fast heating (10 °C min−1) proved to be higher than that of the coal alone with slow heating (3 °C min−1) and resulted in a 3% reduction in non-renewable carbon emissions. 相似文献