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采用自制的相平衡研究装置,测定了PEG 4000-Cs2SO4-H2O三元体系在25,35和45℃时的等温平衡溶解度,同时给出了该体系的完整相图,在相图中观察到6个相区。结果表明,该体系双液相区随着温度的升高略有增加,结线的斜率也随温度的升高而增大。用四参数方程y=a bx^0.5 cχ dχ^2对该体系的双液线进行了拟合,拟合结果较好。用Othmer-Tobias方程和Bancroft方程对该体系结线的实验数据进行了关联,所有线性相关系数均大于0.98。热重分析确定平衡固相组成为无水硫酸铯。 相似文献
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以聚乙二醇PEG4000为模板剂,采用溶胶-凝胶法制备多孔钛酸锶光催化剂,研究PEG4000添加量对催化剂组成和性能的影响。结果表明:添加模板剂后样品的比表面积显著增大,钛酸锶的物相由Sr2TiO4转变成SrTiO3。随着模板剂添加量的增加,样品的颗粒粒径逐渐变小,SrTiO3相的晶粒尺寸也逐渐下降。当PEG4000的添加量为1.5g时,多孔样品由SrTiO3和SrCO3相组成,SrTiO3相的特征衍射峰强度最大,样品的光催化活性最强。当光催化时间为120min时,甲基橙在多孔样品上的降解率为97.9%,明显高于未添加PEG4000制备的样品。 相似文献
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《Drug development and industrial pharmacy》2013,39(10):1241-1250
ABSTRACTSolid dispersions of lonidamine in PEG 4000 and PVP K 29/32 were prepared by the spray-drying method. Then, the binary systems were studied and characterized using differential scanning calorimetry, hot stage microscopy, and x-ray diffractometry. In vitro dissolution studies of the solid dispersed powders were performed to verify if any lonidamine dissolution rate or water solubility improvement occurred. In vivo tests were carried out on the solid dispersions and on the cyclodextrin inclusion complexes to verify if this lonidamine water solubility increase was really able to improve the in vivo drug plasma levels. Drug water solubility was increased by the solid dispersion formation, and the extent of increase depended on the polymer content of the powder. The greater increase of solubility corresponded to the highest content of polymer. Both the solid dispersions and the cyclodextrin complexes were able to improve the in vivo bioavailability of the lonidamine when administered per os. Particularly, the AUC of the drug plasma levels was increased from 1.5 to 1.9-fold depending on the type of carrier. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(12):1056-1062
Mesocarbon microbeads (MCMBs) heat-treated at 1,273 and 3,073 K were irradiated with an electron beam current density ~1.34μA/cm2 of 0.5–1.5 MeV for 0–600 s, and the irradiated MCMBs were examined as anode materials for secondary lithium-ion batteries. Charge capacity of both materials irradiated for short time within 100 s became larger than that before irradiation. Improvement of discharge capacity of MCMB annealed at 3,073 K was achieved by irradiation with 0.5 and 1.5 MeV electrons for 600 s. Good performance of cyclical discharge of MCMB annealed at 3,073 K was also attained by the irradiation with 0.5–1.5 MeV electrons for 600 s. 相似文献
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Palmieri GF Cantalamessa F Di Martino P Nasuti C Martelli S 《Drug development and industrial pharmacy》2002,28(10):1241-1250
Solid dispersions of lonidamine in PEG 4000 and PVP K 29/32 were prepared by the spray-drying method. Then, the binary systems were studied and characterized using differential scanning calorimetry, hot stage microscopy, and x-ray diffractometry. In vitro dissolution studies of the solid dispersed powders were performed to verify if any lonidamine dissolution rate or water solubility improvement occurred. In vivo tests were carried out on the solid dispersions and on the cyclodextrin inclusion complexes to verify if this lonidamine water solubility increase was really able to improve the in vivo drug plasma levels. Drug water solubility was increased by the solid dispersion formation, and the extent of increase depended on the polymer content of the powder. The greater increase of solubility corresponded to the highest content of polymer. Both the solid dispersions and the cyclodextrin complexes were able to improve the in vivo bioavailability of the lonidamine when administered per os. Particularly, the AUC of the drug plasma levels was increased from 1.5 to 1.9-fold depending on the type of carrier. 相似文献
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概述了QCS水泥生料质量控制系统的要求及ADAM-4000的特性。介绍了ADAM-4000在QCS生料质量控制系统中的应用及使用注意事项。 相似文献
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