To overcome the shortcomings of pouring sands, a thickener with the ability to suspend sands was developed. It is mixed with sands to form densified slurry, and can insure the sands against deposition, jamming pipelin...To overcome the shortcomings of pouring sands, a thickener with the ability to suspend sands was developed. It is mixed with sands to form densified slurry, and can insure the sands against deposition, jamming pipelines and de- hydration. The chemical structure of the thickener is introduced in this paper and the production process is studied. The main processes include immersion, decomposition, dilution and addition of additives. In order to produce a thickener with high viscosity to suspend sands, key factors must be controlled in each process: the immersion time is 2 h; the mass fraction of formaldehyde is 0.01% and mass of NaCO3 accounts for 15% of dry material; the water temperature is 65 ℃ in summer and 72 ℃ in winter and the decomposition time is 2 h in the reaction; the densified decomposition so- lution should be diluted to 1% mass fraction; the additives of calcium ions and pH indicators must be added to the di- luted liquid; the mass fraction of CaCl2 is 0.048% and the pH value of the solution is 7.5. The thickener is a gel with three-dimensional network structure, a liquid with non-Newtonian behaviour and the characteristics of pseudo-plastic material, a solution with little resistance and the ability to revive its oral primary viscosity. It has been successfully ap- plied in Shendong Mines and has great value and wide-spread prospective use.展开更多
目的评价使用富自体浓缩生长因子联合Bio-Oss(deproteinized bovine bone mineral)骨粉填充颌骨囊肿术后中、大型骨缺损的临床疗效,为其推广应用提供参考依据。方法选取2016年7月—2017年10月颍上县人民医院口腔颌面外科收治的30例颌骨...目的评价使用富自体浓缩生长因子联合Bio-Oss(deproteinized bovine bone mineral)骨粉填充颌骨囊肿术后中、大型骨缺损的临床疗效,为其推广应用提供参考依据。方法选取2016年7月—2017年10月颍上县人民医院口腔颌面外科收治的30例颌骨囊肿术后中、大型骨缺损患者作为研究对象,采用富自体浓缩生长因子联合Bio-Oss骨粉填充骨腔,富自体浓缩生长因子压制成膜双层覆盖在骨缺损区表面。术后分别于第3、6、12个月进行定期观察随访,通过临床和影像学检查评估其疗效。结果 30例颌骨缺损修复患者术后伤口均为Ⅰ期甲级愈合,无一例出现术后感染和排异反应。影像学检查显示术后3个月可见骨腔内大量新骨形成,骨缺损区较术前明显缩小;术后6个月可见新骨密度增高,骨腔内有大量骨小梁形成,新骨与周围骨质界限模糊;术后12个月可见植骨区与周围颌骨组织密度接近,界限基本消失,连续性完整,充填材料与新生骨及周围骨组织生长良好,骨缺损区完全修复,表现出良好的软组织及骨组织修复效果。结论富自体浓缩生长因子联合Bio-Oss骨粉填充颌骨囊肿术后中、大型骨缺损区可有效促进骨组织修复和软组织愈合,有望作为一种新型、有效的颌骨缺损修复方式推广应用于临床。展开更多
We extend an optimal entanglement distillation of the triplet Greenberger–Horne–Zeilinger(GHZ) state via entanglement concentrating in the three-partite partially electron-spin-entangled systems. Two entanglement co...We extend an optimal entanglement distillation of the triplet Greenberger–Horne–Zeilinger(GHZ) state via entanglement concentrating in the three-partite partially electron-spin-entangled systems. Two entanglement concentration protocols are similarly designed in detail with the post-selection in quantum-dot(QD) and micro-cavity coupled systems. The proposed protocol can be repeated several rounds to achieve an optimal success probability with an assistance of the ancillary QD, where only the single photon needs to pass through the micro-cavity for each round. It increases the total success probability of the distillation even if the implemented cavity is imperfect in practice during the whole process.展开更多
基金Projects 50274068 Supported by National Natural Science Foundation of China and 20020290001 by Research Fund for Doctoral Program of HigherEducation
文摘To overcome the shortcomings of pouring sands, a thickener with the ability to suspend sands was developed. It is mixed with sands to form densified slurry, and can insure the sands against deposition, jamming pipelines and de- hydration. The chemical structure of the thickener is introduced in this paper and the production process is studied. The main processes include immersion, decomposition, dilution and addition of additives. In order to produce a thickener with high viscosity to suspend sands, key factors must be controlled in each process: the immersion time is 2 h; the mass fraction of formaldehyde is 0.01% and mass of NaCO3 accounts for 15% of dry material; the water temperature is 65 ℃ in summer and 72 ℃ in winter and the decomposition time is 2 h in the reaction; the densified decomposition so- lution should be diluted to 1% mass fraction; the additives of calcium ions and pH indicators must be added to the di- luted liquid; the mass fraction of CaCl2 is 0.048% and the pH value of the solution is 7.5. The thickener is a gel with three-dimensional network structure, a liquid with non-Newtonian behaviour and the characteristics of pseudo-plastic material, a solution with little resistance and the ability to revive its oral primary viscosity. It has been successfully ap- plied in Shendong Mines and has great value and wide-spread prospective use.
文摘目的评价使用富自体浓缩生长因子联合Bio-Oss(deproteinized bovine bone mineral)骨粉填充颌骨囊肿术后中、大型骨缺损的临床疗效,为其推广应用提供参考依据。方法选取2016年7月—2017年10月颍上县人民医院口腔颌面外科收治的30例颌骨囊肿术后中、大型骨缺损患者作为研究对象,采用富自体浓缩生长因子联合Bio-Oss骨粉填充骨腔,富自体浓缩生长因子压制成膜双层覆盖在骨缺损区表面。术后分别于第3、6、12个月进行定期观察随访,通过临床和影像学检查评估其疗效。结果 30例颌骨缺损修复患者术后伤口均为Ⅰ期甲级愈合,无一例出现术后感染和排异反应。影像学检查显示术后3个月可见骨腔内大量新骨形成,骨缺损区较术前明显缩小;术后6个月可见新骨密度增高,骨腔内有大量骨小梁形成,新骨与周围骨质界限模糊;术后12个月可见植骨区与周围颌骨组织密度接近,界限基本消失,连续性完整,充填材料与新生骨及周围骨组织生长良好,骨缺损区完全修复,表现出良好的软组织及骨组织修复效果。结论富自体浓缩生长因子联合Bio-Oss骨粉填充颌骨囊肿术后中、大型骨缺损区可有效促进骨组织修复和软组织愈合,有望作为一种新型、有效的颌骨缺损修复方式推广应用于临床。
基金Supported by the National Natural Science Foundation of China under Grant No.61379153the New Century Excellent Talents in University,China(NCET-11-0510)+1 种基金partly by the Research Plan Projects of Science–Technology Department of Hunan Province under Grant No.2012TZ2017the Construct Program of the Key Discipline in Hunan Province
文摘We extend an optimal entanglement distillation of the triplet Greenberger–Horne–Zeilinger(GHZ) state via entanglement concentrating in the three-partite partially electron-spin-entangled systems. Two entanglement concentration protocols are similarly designed in detail with the post-selection in quantum-dot(QD) and micro-cavity coupled systems. The proposed protocol can be repeated several rounds to achieve an optimal success probability with an assistance of the ancillary QD, where only the single photon needs to pass through the micro-cavity for each round. It increases the total success probability of the distillation even if the implemented cavity is imperfect in practice during the whole process.
