再生混凝土是指将旧混凝土经过破碎、清洗等工序,加工成骨料,再按照配合比要求掺入矿物添加剂后形成的新型混凝土材料,其性能与普通混凝土相比存在一定差异。通过实验,探讨在骨料替代率不同、粉煤灰掺量不同的情况下被硫酸盐侵蚀后的再...再生混凝土是指将旧混凝土经过破碎、清洗等工序,加工成骨料,再按照配合比要求掺入矿物添加剂后形成的新型混凝土材料,其性能与普通混凝土相比存在一定差异。通过实验,探讨在骨料替代率不同、粉煤灰掺量不同的情况下被硫酸盐侵蚀后的再生混凝土抗压强度变化,得到其在不同条件下的强度变化曲线,并通过扫描电子显微镜(scanning electron microscope,SEM)分析再生混凝土的界面特性,以期为相关研究提供参考。展开更多
针对西安某地铁车站基坑Q3原状黄土,开展偏应力恒定的循环球应力加/卸载试验,对不同固结应力与不同动应力幅值条件下原状黄土的轴向变形与体应变发展规律进行分析。结果表明:循环球应力作用下,黄土会产生一定的不可逆塑性变形与可逆弹...针对西安某地铁车站基坑Q3原状黄土,开展偏应力恒定的循环球应力加/卸载试验,对不同固结应力与不同动应力幅值条件下原状黄土的轴向变形与体应变发展规律进行分析。结果表明:循环球应力作用下,黄土会产生一定的不可逆塑性变形与可逆弹性变形,其变形增长规律与偏压程度和动应力幅值成正比,与固结应力成反比;轴向变形规律符合Monismith C L幂函数模型,且其模型参数与固结应力条件具有显著的相关性;原状黄土在加载初期体应变累积较明显,之后逐渐趋于稳定;固结应力比对体应变影响较小,固结球应力对体应变发展具有抑制作用,表明浅层土体更容易产生压缩变形。展开更多
目的:观察天芪降糖胶囊联合二甲双胍治疗老年2型糖尿病伴脑微血管病变的疗效和安全性。方法:96例老年2型糖尿病伴脑微血管病变患者随机分为对照组(48例)和观察组(48例)。对照组患者给予盐酸二甲双胍片0.5 g,口服,每日3次;观察组患者在...目的:观察天芪降糖胶囊联合二甲双胍治疗老年2型糖尿病伴脑微血管病变的疗效和安全性。方法:96例老年2型糖尿病伴脑微血管病变患者随机分为对照组(48例)和观察组(48例)。对照组患者给予盐酸二甲双胍片0.5 g,口服,每日3次;观察组患者在对照组治疗的基础上给予天芪降糖胶囊1.6 g,口服,每日3次。两组均用药4周。观察两组患者的临床疗效,治疗前后中医证候总积分、血糖水平[空腹血糖(FPG)、餐后2 h血糖(2 h PG)、糖化血红蛋白(Hb A1c)]、血脂水平[总胆固醇(TC)、三酰甘油(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)]、超敏C反应蛋白(hs-CRP)和内皮素-1(ET-1)水平、血液流变学指标、氧化应激指标[丙二醛(MDA)、超氧化物歧化酶(SOD)]及不良反应发生情况。结果:观察组患者总有效率显著高于对照组(89.58%vs.70.83%),差异有统计学意义(P<0.05)。治疗后,两组患者中医证候总积分和血糖、hs-CRP、ET-1、TC、TG、LDL-C、血液流变学指标、MDA水平均显著低于同组治疗前,且观察组中医证候总积分、FPG、2 h PG、hs-CRP、ET-1、TC、TG、LDL-C、血液流变学指标、MDA水平均显著低于对照组;两组患者SOD水平均显著高于同组治疗前,且观察组显著高于对照组,同时观察组HDL-C水平显著高于同组治疗前及对照组,差异均有统计学意义(P<0.05)。两组患者治疗期间均未见明显不良反应发生。结论:天芪降糖胶囊联合二甲双胍治疗老年2型糖尿病伴脑微血管病变的疗效显著,可降低血糖、血脂水平,改善机体血液流变学状态及氧化应激反应,且安全性较好。展开更多
An immobilized metal ion affinity membrane was prepared by plasma-induced graft polymerization of glycidyl methacrylate (GMA) onto a porous polypropylene(PP), followed by chemical conversion of epoxide group of the GM...An immobilized metal ion affinity membrane was prepared by plasma-induced graft polymerization of glycidyl methacrylate (GMA) onto a porous polypropylene(PP), followed by chemical conversion of epoxide group of the GMA grafted membrane into an iminodiacetate(IDA) group, and chelation with copper ion. The effect of plasma discharge condition, GMA monomer concentration and grafting time on the degree of GMA grafting was studied and the optimum condition for plasma treatment of membrane was:10 W for 30 s, and that for grafting is 30 h at a concentration of 1 mol· L -1 GMA.Under this condition, a maximum grafting degree of 13.28% was obtained. The spectra of IR and XPS shows that GMA and IDA had been attached to the PP membrane after grafting and coupling. The nonselective adsorption of PP membrane had been significantly reduced after the H 2SO 4 treatment of the IDA coupled membrane. Finally, the isotherm adsorption of bovine serum albumin (BSA) on the immobilized metal ion affinity membrane was measured and the adsorption capacity of BSA increased with the degree of grafting. When BSA concentration was 1080 μg·ml -1 ,the adsorption ability of the affinity membrane with a grafting degree of 5.3% was nearly twice as much as that membrane with a grafting degree of 4.66%.展开更多
文摘再生混凝土是指将旧混凝土经过破碎、清洗等工序,加工成骨料,再按照配合比要求掺入矿物添加剂后形成的新型混凝土材料,其性能与普通混凝土相比存在一定差异。通过实验,探讨在骨料替代率不同、粉煤灰掺量不同的情况下被硫酸盐侵蚀后的再生混凝土抗压强度变化,得到其在不同条件下的强度变化曲线,并通过扫描电子显微镜(scanning electron microscope,SEM)分析再生混凝土的界面特性,以期为相关研究提供参考。
文摘针对西安某地铁车站基坑Q3原状黄土,开展偏应力恒定的循环球应力加/卸载试验,对不同固结应力与不同动应力幅值条件下原状黄土的轴向变形与体应变发展规律进行分析。结果表明:循环球应力作用下,黄土会产生一定的不可逆塑性变形与可逆弹性变形,其变形增长规律与偏压程度和动应力幅值成正比,与固结应力成反比;轴向变形规律符合Monismith C L幂函数模型,且其模型参数与固结应力条件具有显著的相关性;原状黄土在加载初期体应变累积较明显,之后逐渐趋于稳定;固结应力比对体应变影响较小,固结球应力对体应变发展具有抑制作用,表明浅层土体更容易产生压缩变形。
文摘目的:观察天芪降糖胶囊联合二甲双胍治疗老年2型糖尿病伴脑微血管病变的疗效和安全性。方法:96例老年2型糖尿病伴脑微血管病变患者随机分为对照组(48例)和观察组(48例)。对照组患者给予盐酸二甲双胍片0.5 g,口服,每日3次;观察组患者在对照组治疗的基础上给予天芪降糖胶囊1.6 g,口服,每日3次。两组均用药4周。观察两组患者的临床疗效,治疗前后中医证候总积分、血糖水平[空腹血糖(FPG)、餐后2 h血糖(2 h PG)、糖化血红蛋白(Hb A1c)]、血脂水平[总胆固醇(TC)、三酰甘油(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)]、超敏C反应蛋白(hs-CRP)和内皮素-1(ET-1)水平、血液流变学指标、氧化应激指标[丙二醛(MDA)、超氧化物歧化酶(SOD)]及不良反应发生情况。结果:观察组患者总有效率显著高于对照组(89.58%vs.70.83%),差异有统计学意义(P<0.05)。治疗后,两组患者中医证候总积分和血糖、hs-CRP、ET-1、TC、TG、LDL-C、血液流变学指标、MDA水平均显著低于同组治疗前,且观察组中医证候总积分、FPG、2 h PG、hs-CRP、ET-1、TC、TG、LDL-C、血液流变学指标、MDA水平均显著低于对照组;两组患者SOD水平均显著高于同组治疗前,且观察组显著高于对照组,同时观察组HDL-C水平显著高于同组治疗前及对照组,差异均有统计学意义(P<0.05)。两组患者治疗期间均未见明显不良反应发生。结论:天芪降糖胶囊联合二甲双胍治疗老年2型糖尿病伴脑微血管病变的疗效显著,可降低血糖、血脂水平,改善机体血液流变学状态及氧化应激反应,且安全性较好。
文摘An immobilized metal ion affinity membrane was prepared by plasma-induced graft polymerization of glycidyl methacrylate (GMA) onto a porous polypropylene(PP), followed by chemical conversion of epoxide group of the GMA grafted membrane into an iminodiacetate(IDA) group, and chelation with copper ion. The effect of plasma discharge condition, GMA monomer concentration and grafting time on the degree of GMA grafting was studied and the optimum condition for plasma treatment of membrane was:10 W for 30 s, and that for grafting is 30 h at a concentration of 1 mol· L -1 GMA.Under this condition, a maximum grafting degree of 13.28% was obtained. The spectra of IR and XPS shows that GMA and IDA had been attached to the PP membrane after grafting and coupling. The nonselective adsorption of PP membrane had been significantly reduced after the H 2SO 4 treatment of the IDA coupled membrane. Finally, the isotherm adsorption of bovine serum albumin (BSA) on the immobilized metal ion affinity membrane was measured and the adsorption capacity of BSA increased with the degree of grafting. When BSA concentration was 1080 μg·ml -1 ,the adsorption ability of the affinity membrane with a grafting degree of 5.3% was nearly twice as much as that membrane with a grafting degree of 4.66%.
