Synthesis of cobalt oxide (Co 3O 4) nanorods was achieved by templating against carbon nanotubes via wet chemical technique. The products with crystalline structure were mainly composed of Co 3O 4 nanorods with di...Synthesis of cobalt oxide (Co 3O 4) nanorods was achieved by templating against carbon nanotubes via wet chemical technique. The products with crystalline structure were mainly composed of Co 3O 4 nanorods with diameters in the range of ca . 75-100 nm and lengths in the range of 0.12-1 μm, and were characterized by XRD, TEM, SAED and HRTEM.展开更多
The Raman and infrared spectra, resistivity as well as thermoelectric power of Y 1- x Nd x Sr 2Cu 2.7 Mo 0.3 O 7- δ ( x =0, 0.1, 0.2, 0.5, 0.8 and 1.0) are studied carefully. It was found that the structure character...The Raman and infrared spectra, resistivity as well as thermoelectric power of Y 1- x Nd x Sr 2Cu 2.7 Mo 0.3 O 7- δ ( x =0, 0.1, 0.2, 0.5, 0.8 and 1.0) are studied carefully. It was found that the structure characteristics of RSr 2Cu 2.7 Mo 0.3 O 7- δ cuprates are different from those of RBa 2Cu 3O 7- δ . The variations of the microstructure in Y 1- x Nd x Sr 2Cu 2.7 Mo 0.3 O 7- δ with Nd doping affect the carrier distribution, so as a result the superconductivity changes. Furthermore, it is pointed out that the microstructure variations with the large rare earth ionic substitution cause the widely existing rare earth ionic size effect in HTSC.展开更多
YBa 2Cu 3O 7-δ weak link junctions with width from 0.1 mm to 0.3 mm and length from 0.2 mm to 0.5 mm was made by hand with a razor blade. The current voltage characteristics of the microbridges show, under...YBa 2Cu 3O 7-δ weak link junctions with width from 0.1 mm to 0.3 mm and length from 0.2 mm to 0.5 mm was made by hand with a razor blade. The current voltage characteristics of the microbridges show, under microwave irradiation, pronounced Shapiro steps up to transition temperature. A careful measurement of the dependence of the critical supercurrent on the external magnetic field and laser light is presented.展开更多
采用溶胶-凝胶法制备LiV 3-y Nb y O 8(y=0、0.03、0.06和0.09)正极材料。通过XRD、SEM和电化学性能测试,研究材料的结构、形貌和电化学性能。Nb掺杂不改变钒酸锂(LiV 3O 8)的单斜层状结构,但可增大晶胞体积,掺杂后仍为亚微米颗粒。当y=...采用溶胶-凝胶法制备LiV 3-y Nb y O 8(y=0、0.03、0.06和0.09)正极材料。通过XRD、SEM和电化学性能测试,研究材料的结构、形貌和电化学性能。Nb掺杂不改变钒酸锂(LiV 3O 8)的单斜层状结构,但可增大晶胞体积,掺杂后仍为亚微米颗粒。当y=0.06时,电化学性能最好,在1.8~4.0 V循环具有良好的倍率性能,电流为0.1 A/g、5.0 A/g时的放电比容量分别为396.5 mAh/g、124.9 mAh/g。电化学性能改善的主要原因是:Nb掺杂提高了材料的Li+扩散系数,降低了电荷间的转移电阻。展开更多
Two kinds of Nd 1+ x Ba 2- x Cu 3O 7- δ , the sintered samples and zone melted samples, were treated in pure Ar at 950 ℃. The substitution of Nd ions for Ba ions in the Nd 1+ x Ba 2- ...Two kinds of Nd 1+ x Ba 2- x Cu 3O 7- δ , the sintered samples and zone melted samples, were treated in pure Ar at 950 ℃. The substitution of Nd ions for Ba ions in the Nd 1+ x Ba 2- x Cu 3O 7- δ before and after the heat treatment was investigated by XRD. In order to know the effects of heat treatment, the T c and J c of samples with and without the heat treatment in Ar were comparatively studied. The results show that the substitution of Nd for Ba decreases, whereas T c and J c increase after the treatment. The Nd 1+ x Ba 2- x Cu 3O 7- δ samples were oxygenated in pure oxygen at 300 ℃ . Based on the XRD spectra it was found that the samples with x <0.4 can transform from tetragonal phase into orthorhombic phase after the oxygenation, whereas in the sample with x >0.4 no phase transition occurs even after a long time oxygenation.展开更多
文摘目的 探讨纳米Fe 3O 4双歧杆菌脂磷壁酸对轮状病毒肠炎的疗效及对血清白细胞介素(IL)-6、降钙素原(PCT)、C反应蛋白(CRP)水平的影响。方法 由动物实验室采购40只健康雄性SD大鼠,将所有大鼠随机分为对照组与研究组,每组20只,并制成轮状病毒肠炎大鼠模型。对照组大鼠使用传统治疗方式,研究组大鼠在对照组基础上加用纳米Fe 3O 4双歧杆菌脂磷壁酸。比较两组大鼠治疗后的临床效果、血清IL-6、PCT、CRP水平变化情况。结果 研究组大鼠治疗有效率高于对照组( P <0.05);治疗后,两组大鼠的血清IL-6、PCT、CRP水平较治疗前均有所下降( P <0.05),且研究组大鼠的3种指标水平低于对照组( P <0.05);研究组大鼠止泻时间、退热时间均短于对照组( P <0.05);研究组大鼠治疗5 d后及10 d后的轮状病毒转阴率均高于对照组( P <0.05)。结论 纳米Fe 3O 4双歧杆菌脂磷壁酸治疗轮状病毒肠炎疗效显著,炎性反应较轻,有降低血清IL-6、PCT、CRP水平的效果,转阴率较高,但应用于临床中是否有效,仍需大量研究提供依据。
基金theNaturalScienceFoundationofAnhuiProvinceofChina (No .4 5 12 2 )theEducationDepartmentofAnhuiProvinceofChina (No .2 0 0 1115ZD)
文摘Synthesis of cobalt oxide (Co 3O 4) nanorods was achieved by templating against carbon nanotubes via wet chemical technique. The products with crystalline structure were mainly composed of Co 3O 4 nanorods with diameters in the range of ca . 75-100 nm and lengths in the range of 0.12-1 μm, and were characterized by XRD, TEM, SAED and HRTEM.
文摘The Raman and infrared spectra, resistivity as well as thermoelectric power of Y 1- x Nd x Sr 2Cu 2.7 Mo 0.3 O 7- δ ( x =0, 0.1, 0.2, 0.5, 0.8 and 1.0) are studied carefully. It was found that the structure characteristics of RSr 2Cu 2.7 Mo 0.3 O 7- δ cuprates are different from those of RBa 2Cu 3O 7- δ . The variations of the microstructure in Y 1- x Nd x Sr 2Cu 2.7 Mo 0.3 O 7- δ with Nd doping affect the carrier distribution, so as a result the superconductivity changes. Furthermore, it is pointed out that the microstructure variations with the large rare earth ionic substitution cause the widely existing rare earth ionic size effect in HTSC.
文摘YBa 2Cu 3O 7-δ weak link junctions with width from 0.1 mm to 0.3 mm and length from 0.2 mm to 0.5 mm was made by hand with a razor blade. The current voltage characteristics of the microbridges show, under microwave irradiation, pronounced Shapiro steps up to transition temperature. A careful measurement of the dependence of the critical supercurrent on the external magnetic field and laser light is presented.
文摘采用溶胶-凝胶法制备LiV 3-y Nb y O 8(y=0、0.03、0.06和0.09)正极材料。通过XRD、SEM和电化学性能测试,研究材料的结构、形貌和电化学性能。Nb掺杂不改变钒酸锂(LiV 3O 8)的单斜层状结构,但可增大晶胞体积,掺杂后仍为亚微米颗粒。当y=0.06时,电化学性能最好,在1.8~4.0 V循环具有良好的倍率性能,电流为0.1 A/g、5.0 A/g时的放电比容量分别为396.5 mAh/g、124.9 mAh/g。电化学性能改善的主要原因是:Nb掺杂提高了材料的Li+扩散系数,降低了电荷间的转移电阻。
文摘Two kinds of Nd 1+ x Ba 2- x Cu 3O 7- δ , the sintered samples and zone melted samples, were treated in pure Ar at 950 ℃. The substitution of Nd ions for Ba ions in the Nd 1+ x Ba 2- x Cu 3O 7- δ before and after the heat treatment was investigated by XRD. In order to know the effects of heat treatment, the T c and J c of samples with and without the heat treatment in Ar were comparatively studied. The results show that the substitution of Nd for Ba decreases, whereas T c and J c increase after the treatment. The Nd 1+ x Ba 2- x Cu 3O 7- δ samples were oxygenated in pure oxygen at 300 ℃ . Based on the XRD spectra it was found that the samples with x <0.4 can transform from tetragonal phase into orthorhombic phase after the oxygenation, whereas in the sample with x >0.4 no phase transition occurs even after a long time oxygenation.
