In order to improve the tensile property, flexuralproperty and drying shrinkage of strain-hardening cementitiouscomposites （SHCC）, mixtures quantitatively modified withsuperabsorbent polymer （SAP） were investigate...In order to improve the tensile property, flexuralproperty and drying shrinkage of strain-hardening cementitiouscomposites （SHCC）, mixtures quantitatively modified withsuperabsorbent polymer （SAP） were investigated. Theuniaxial tensile test, the four-point bending test, thecompressive test, the drying shrinkage test and theenvironmental scanning electron microscope （ESEM） wereemployed to investigate the tensile strain capacity, flexuraldeformation capacity, compressive strength, drying shrinkage,crack width and self-healing of SHCC. The experimentalresults show that SHCC modified with SAP particles exhibitsexcellent ductility and deformability, and the tensile strain isup to about 4.5% and the average crack width is controlledaround 40 μm. Meanwhile, the drying shrinkage of SHCCmodified with SAP particles can reduce by about 60%.Furthermore, the self-healing behavior is observed in thecracks of specimen after three cycles of high-low relativehumidity curing, and the self-healing products can completelyfill the cracks of SHCC specimens modified with SAPparticles. It is, therefore, feasible to produce SHCC materialmodified with SAP particles, while simultaneously retaininghigher material ductility.展开更多
目的探讨SHCC患者RFA治疗中进行性低血压发生的风险,并提出预防性建议。方法所有病例均经过病理活检确诊为SHCC。于麻醉前(记为T0时刻),麻醉完成时(记为T1时刻),手术开始时(记为T2时刻),手术开始后10 min(记为T3时刻),手术开始后30 min...目的探讨SHCC患者RFA治疗中进行性低血压发生的风险,并提出预防性建议。方法所有病例均经过病理活检确诊为SHCC。于麻醉前(记为T0时刻),麻醉完成时(记为T1时刻),手术开始时(记为T2时刻),手术开始后10 min(记为T3时刻),手术开始后30 min(记为T4时刻),手术结束时(记为T5时刻),患者苏醒时(记为T6时刻)记录患者的舒张压和收缩压。并分析病灶数目、最大病灶直径、患病年限以及病理学分化等级与患者的舒张压和收缩压的关联性。结果围手术期不同时段测得的血压值结果显示,舒张压围手术期不同时段测得的结果差异不具有统计学意义(P>0.05);但收缩压围手术期不同时段测得的结果差异具有统计学意义(P<0.05),手术开始前30 min总体呈现下降趋势,手术开始后30 min起总体呈现上升趋势。由于手术开始后30 min SHCC患者的收缩压水平开始发生逆转,分析病灶数目、最大病灶直径、患病年限以及病理学分化等级与手术开始后30 min SHCC患者的收缩压水平的关联性。结果显示,病灶数目、最大病灶直径以及病理学分化等级与手术开始后30 min SHCC患者的收缩压水平,其中病灶数目越多、最大病灶直径越大以及病理学分化越低的患者手术开始后30 min SHCC患者的收缩压水平越低(P<0.05)。结论SHCC患者RFA治疗中进行性低血压的根本解决途径是提高术者的手术技巧,减少出血量;此外,低血压在一定范围内建议密切监测,不建议立即给予升压药物。展开更多
基金The National Natural Science Foundation of China(No.51278097)Start-up Grant provided by Nanyang Technological University(No.M4081208)
文摘In order to improve the tensile property, flexuralproperty and drying shrinkage of strain-hardening cementitiouscomposites （SHCC）, mixtures quantitatively modified withsuperabsorbent polymer （SAP） were investigated. Theuniaxial tensile test, the four-point bending test, thecompressive test, the drying shrinkage test and theenvironmental scanning electron microscope （ESEM） wereemployed to investigate the tensile strain capacity, flexuraldeformation capacity, compressive strength, drying shrinkage,crack width and self-healing of SHCC. The experimentalresults show that SHCC modified with SAP particles exhibitsexcellent ductility and deformability, and the tensile strain isup to about 4.5% and the average crack width is controlledaround 40 μm. Meanwhile, the drying shrinkage of SHCCmodified with SAP particles can reduce by about 60%.Furthermore, the self-healing behavior is observed in thecracks of specimen after three cycles of high-low relativehumidity curing, and the self-healing products can completelyfill the cracks of SHCC specimens modified with SAPparticles. It is, therefore, feasible to produce SHCC materialmodified with SAP particles, while simultaneously retaininghigher material ductility.
文摘目的探讨SHCC患者RFA治疗中进行性低血压发生的风险,并提出预防性建议。方法所有病例均经过病理活检确诊为SHCC。于麻醉前(记为T0时刻),麻醉完成时(记为T1时刻),手术开始时(记为T2时刻),手术开始后10 min(记为T3时刻),手术开始后30 min(记为T4时刻),手术结束时(记为T5时刻),患者苏醒时(记为T6时刻)记录患者的舒张压和收缩压。并分析病灶数目、最大病灶直径、患病年限以及病理学分化等级与患者的舒张压和收缩压的关联性。结果围手术期不同时段测得的血压值结果显示,舒张压围手术期不同时段测得的结果差异不具有统计学意义(P>0.05);但收缩压围手术期不同时段测得的结果差异具有统计学意义(P<0.05),手术开始前30 min总体呈现下降趋势,手术开始后30 min起总体呈现上升趋势。由于手术开始后30 min SHCC患者的收缩压水平开始发生逆转,分析病灶数目、最大病灶直径、患病年限以及病理学分化等级与手术开始后30 min SHCC患者的收缩压水平的关联性。结果显示,病灶数目、最大病灶直径以及病理学分化等级与手术开始后30 min SHCC患者的收缩压水平,其中病灶数目越多、最大病灶直径越大以及病理学分化越低的患者手术开始后30 min SHCC患者的收缩压水平越低(P<0.05)。结论SHCC患者RFA治疗中进行性低血压的根本解决途径是提高术者的手术技巧,减少出血量;此外,低血压在一定范围内建议密切监测,不建议立即给予升压药物。
