In order to provide the theoretical guidance for applying the neutralization method to treatment of heavy metals wastewater with high concentration of sulfate, and to better understand the mechanism of calcium sulfate...In order to provide the theoretical guidance for applying the neutralization method to treatment of heavy metals wastewater with high concentration of sulfate, and to better understand the mechanism of calcium sulfate scale formation, the equilibrium solubility data of CaSOa-Ca(OH)2-H2O system at 298.15 K were theoretically calculated via the Pitzer semi-empirical ion-interaction theory, and determined experimentally by the optical method combining with X-ray diffractometry, and the calculated and determined phase diagrams of CaSOa-Ca(OH)2-H2O system were plotted and compared. Physical definition of each area was studied, and the physical law of characteristic point and line was explained in detail. Adjusting the pH value of neutralization-hydrolysis solution depended on the SO4z- concentration in the system. And interaction characteristics between the solubilities of CaSO4(s)and Ca(OH)2(s)were found out.展开更多
探讨甲状腺手术方式对术后患者血钙离子(Ca^(2+))变化的影响。选择2012年5月—2015年8月接受手术治疗的甲状腺病变患者178例作为研究对象。其中双侧大部分切除术者62例(A组),单侧叶全切+峡部及对侧大部分切除术34例(B组),单侧全切术50...探讨甲状腺手术方式对术后患者血钙离子(Ca^(2+))变化的影响。选择2012年5月—2015年8月接受手术治疗的甲状腺病变患者178例作为研究对象。其中双侧大部分切除术者62例(A组),单侧叶全切+峡部及对侧大部分切除术34例(B组),单侧全切术50例(C组),双侧全切术32例(D组)。分别在术前1 d及术后3、7 d检测各组Ca^(2+)水平,分析各组低钙血症和甲状旁腺功能减退情况,以及低钙血症的发生与甲状旁腺功能减退的相关性。术后3、7 d 4组间Ca^(2+)水平比较,C组显著高于A、B、D组,差异有统计学意义(P<0.05)。组内比较显示,各组术后3 d Ca^(2+)水平均显著低于术前;术后7 d除C组外,其余各组均显著低于术前,差异有统计学意义(P<0.05)。各组术后7 d Ca^(2+)水平均显著高于术后3 d,差异有统计学意义(P<0.05)。A组及D组低钙血症和甲状旁腺功能减退的发生率分别较B组及C组更高,差异有统计学意义(P<0.05)。Pearson法分析显示,血Ca^(2+)水平与甲状旁腺功能减退呈负相关(r=-0.684,P=0.001)。不同手术方式对甲状腺术后患者血Ca^(2+)水平有一定影响,但低钙血症的发生与术中甲状旁腺损伤有关。展开更多
基金Project (50925417) supported by the Funds for Distinguished Young Scientists of ChinaProject (50830301) supported by the National Natural Science Foundation of ChinaProject (2009ZX07212-001-01) supported by Major Science and Technology Program for Water Pollution Control and Treatment
文摘In order to provide the theoretical guidance for applying the neutralization method to treatment of heavy metals wastewater with high concentration of sulfate, and to better understand the mechanism of calcium sulfate scale formation, the equilibrium solubility data of CaSOa-Ca(OH)2-H2O system at 298.15 K were theoretically calculated via the Pitzer semi-empirical ion-interaction theory, and determined experimentally by the optical method combining with X-ray diffractometry, and the calculated and determined phase diagrams of CaSOa-Ca(OH)2-H2O system were plotted and compared. Physical definition of each area was studied, and the physical law of characteristic point and line was explained in detail. Adjusting the pH value of neutralization-hydrolysis solution depended on the SO4z- concentration in the system. And interaction characteristics between the solubilities of CaSO4(s)and Ca(OH)2(s)were found out.
文摘探讨甲状腺手术方式对术后患者血钙离子(Ca^(2+))变化的影响。选择2012年5月—2015年8月接受手术治疗的甲状腺病变患者178例作为研究对象。其中双侧大部分切除术者62例(A组),单侧叶全切+峡部及对侧大部分切除术34例(B组),单侧全切术50例(C组),双侧全切术32例(D组)。分别在术前1 d及术后3、7 d检测各组Ca^(2+)水平,分析各组低钙血症和甲状旁腺功能减退情况,以及低钙血症的发生与甲状旁腺功能减退的相关性。术后3、7 d 4组间Ca^(2+)水平比较,C组显著高于A、B、D组,差异有统计学意义(P<0.05)。组内比较显示,各组术后3 d Ca^(2+)水平均显著低于术前;术后7 d除C组外,其余各组均显著低于术前,差异有统计学意义(P<0.05)。各组术后7 d Ca^(2+)水平均显著高于术后3 d,差异有统计学意义(P<0.05)。A组及D组低钙血症和甲状旁腺功能减退的发生率分别较B组及C组更高,差异有统计学意义(P<0.05)。Pearson法分析显示,血Ca^(2+)水平与甲状旁腺功能减退呈负相关(r=-0.684,P=0.001)。不同手术方式对甲状腺术后患者血Ca^(2+)水平有一定影响,但低钙血症的发生与术中甲状旁腺损伤有关。