Growth and morphology of neodymium or ytterbium doped calcium gadolinium yttrium oxoborate (Re∶Ca 4Gd x Y 1- x O(BO 3) 3(Re∶GdYCOB)Re =Nd,Yb; x =0-1)were systematically studied. Polycrystalline materials used for Re...Growth and morphology of neodymium or ytterbium doped calcium gadolinium yttrium oxoborate (Re∶Ca 4Gd x Y 1- x O(BO 3) 3(Re∶GdYCOB)Re =Nd,Yb; x =0-1)were systematically studied. Polycrystalline materials used for Re∶GdYCOB single crystals growth were synthesized by multistage solid phase reaction method.Re∶GdYCOB single crystals were grown by Czochralski technique.The pulling rates are 0.5-2mm/h and the rotation rates are 10-30r/min.Usually 65-75% polycrystalline materials can be transformed into good quality single crystals under our growth conditions. The structures of some as grown Re∶GdYCOB single crystals were measured by using a four circle diffractometer.The results measured show that the space group of the crystals is C 3 s Cm.The determined lattice constants of 8 at% Nd doped Ca 4YO(BO 3) 3 single crystal are a =0.8076nm, b =1.6020nm, c =0.3527nm , β =101.23°.展开更多
目的研究MIF4GD在肝细胞肝癌(HCC)中的表达及其对HCC预后判断的价值。方法 Western blot检测8例HCC及癌旁新鲜组织中MIF4GD表达。免疫组织化学法检测108例HCC及癌旁切片组织中MIF4GD及Ki-67表达。分析MIF4GD表达与HCC各临床病理参数间...目的研究MIF4GD在肝细胞肝癌(HCC)中的表达及其对HCC预后判断的价值。方法 Western blot检测8例HCC及癌旁新鲜组织中MIF4GD表达。免疫组织化学法检测108例HCC及癌旁切片组织中MIF4GD及Ki-67表达。分析MIF4GD表达与HCC各临床病理参数间的相关性,并对病例进行随访,log-rank单因素和多因素Cox比例风险回归模型分析MIF4GD与HCC预后的关系。结果 MIF4GD在HCC组织中的表达明显低于相应的癌旁组织。MIF4GD的表达强度与HCC组织学分级、静脉侵袭和肝硬化状态相关(P<0.05),且MIF4GD表达与Ki-67呈负相关(r=-0.341,P<0.01)。MIF4GD低表达与HCC患者的不良预后显著相关(P<0.05)。结论MIF4GD在HCC中低表达,其可作为HCC独立的预后指标,提示MIF4GD可能与HCC的发生、发展密切相关。展开更多
研究了Mg-12Gd-0.5Zr(GW120K)合金和Mg-12Gd-4Y-0.5Zr(GW124K)合金在350~500℃,应变速率为0.002~1 s^(-1)的热压缩行为,对合金的流变应力、显微组织进行分析,计算了合金的热变形激活能,构建并分析了合金的热加工图。结果表明:两种合金...研究了Mg-12Gd-0.5Zr(GW120K)合金和Mg-12Gd-4Y-0.5Zr(GW124K)合金在350~500℃,应变速率为0.002~1 s^(-1)的热压缩行为,对合金的流变应力、显微组织进行分析,计算了合金的热变形激活能,构建并分析了合金的热加工图。结果表明:两种合金的真应力真应变曲线都表现出动态再结晶的一般特征。添加Y后,合金的流变应力增高;在低温高应变速率(350℃,0.002 s^(-1))变形时,合金易出现45°角剪切断裂;在400℃变形时,在动态再结晶的晶界处析出第二相,添加Y后GW124K合金动态析出相的数量明显增多;在500℃变形时,发生完全动态再结晶,GW124K合金的再结晶晶粒尺寸(25μm)明显小于GW120K合金(40μm);GW120K合金的热变形激活能为218.788 k J·mol^(-1),添加Y后合金的热变形激活能增高至243.530 k J·mol^(-1);Mg-12Gd-(4Y)-0.5Zr两种合金的失稳区集中在低温高应变区域,添加Y后,合金的失稳区增大,可加工区域减小。展开更多
A high-strength magnesium alloy containing Yb was prepared through a simple hot extrusion process.The effect of Yb addition on dynamic precipitation,texture evolution,dynamic recrystallization mechanisms,deformation m...A high-strength magnesium alloy containing Yb was prepared through a simple hot extrusion process.The effect of Yb addition on dynamic precipitation,texture evolution,dynamic recrystallization mechanisms,deformation mechanisms,and strengthening mechanisms in as-extruded Mg-4 Sm-3 Gd(-2 Yb)-0.5 Zr(SGY0,SGY2)alloys was systematically investigated.The results indicated that the average grain size decreased from 4.17μm to 1.48μm with the addition of Yb.This extreme grain refinement greatly enhances the strength.The addition of Yb significantly facilitated the phase precipitation,but did not change the texture type.The non-dynamic recrystallized(un DRXed)grains exhibited a strong basal plane texture of<0110>parallel to the extrusion direction(ED),while the dynamic recrystallized(DRXed)grains showed a weaker rare earth texture,characterized by<1212>//ED.Moreover,the as-extruded SGY0 and SGY2 alloys predominantly undergo continuous dynamic recrystallization(CDRX),and some DRXed grains exhibit a discontinuous dynamic recrystallization mechanism(DDRX).In addition,the addition of Yb facilitates the activation of non-basal plane slip.The dislocation types in the as-extruded SGY0 and SGY2 alloys include(a),(c)and(c+a)dislocations.However,the SGY2 alloy exhibits a relatively high dislocation density,which contributes to the enhancement of the strength.Extreme grain refinement and the dispersion of nanoscale second-phase particles are key factors in increasing the strength.展开更多
It is anticipated to remove highly hazardous tetracycline antibiotic from aqueous solution photocatalytically by using Gd doped spinal ferrite.In this work,both ZnFe_(2)O_(4)and Gd doped ZnFe_(2)O_(4)photocatalysts we...It is anticipated to remove highly hazardous tetracycline antibiotic from aqueous solution photocatalytically by using Gd doped spinal ferrite.In this work,both ZnFe_(2)O_(4)and Gd doped ZnFe_(2)O_(4)photocatalysts were hydrothermally fabricated and characterized by different techniques.The spherical photocatalysts show extended photocatalytic removal efficiency under visible light.The optimized sample(ZnFe_(1.96)Cd_(0.04)O_(4))removes 78%antibiotic in 80 min.Moreover,under simulated solar light irradiation,the rate of hydrogen produced from water splitting photocatalysis with ZnFe_(1.96)Cd_(0.04)O_(4)reaches 230.4μmol/(g h).These increased activities are attributed to the increased specific surface area,the expanded light absorption range and the enhanced charge separation realized by doping Gd.According to the charge trapping study,both superoxide(·O_(2)^(-))and hydroxyl radicals(·OH)were the major active species in the process of removing antibiotic.This research provides a feasible way to fabricate low cost photocatalysts for the eradication of highly hazardous pollutants from aqueous solution.展开更多
文摘Growth and morphology of neodymium or ytterbium doped calcium gadolinium yttrium oxoborate (Re∶Ca 4Gd x Y 1- x O(BO 3) 3(Re∶GdYCOB)Re =Nd,Yb; x =0-1)were systematically studied. Polycrystalline materials used for Re∶GdYCOB single crystals growth were synthesized by multistage solid phase reaction method.Re∶GdYCOB single crystals were grown by Czochralski technique.The pulling rates are 0.5-2mm/h and the rotation rates are 10-30r/min.Usually 65-75% polycrystalline materials can be transformed into good quality single crystals under our growth conditions. The structures of some as grown Re∶GdYCOB single crystals were measured by using a four circle diffractometer.The results measured show that the space group of the crystals is C 3 s Cm.The determined lattice constants of 8 at% Nd doped Ca 4YO(BO 3) 3 single crystal are a =0.8076nm, b =1.6020nm, c =0.3527nm , β =101.23°.
文摘目的研究MIF4GD在肝细胞肝癌(HCC)中的表达及其对HCC预后判断的价值。方法 Western blot检测8例HCC及癌旁新鲜组织中MIF4GD表达。免疫组织化学法检测108例HCC及癌旁切片组织中MIF4GD及Ki-67表达。分析MIF4GD表达与HCC各临床病理参数间的相关性,并对病例进行随访,log-rank单因素和多因素Cox比例风险回归模型分析MIF4GD与HCC预后的关系。结果 MIF4GD在HCC组织中的表达明显低于相应的癌旁组织。MIF4GD的表达强度与HCC组织学分级、静脉侵袭和肝硬化状态相关(P<0.05),且MIF4GD表达与Ki-67呈负相关(r=-0.341,P<0.01)。MIF4GD低表达与HCC患者的不良预后显著相关(P<0.05)。结论MIF4GD在HCC中低表达,其可作为HCC独立的预后指标,提示MIF4GD可能与HCC的发生、发展密切相关。
文摘研究了Mg-12Gd-0.5Zr(GW120K)合金和Mg-12Gd-4Y-0.5Zr(GW124K)合金在350~500℃,应变速率为0.002~1 s^(-1)的热压缩行为,对合金的流变应力、显微组织进行分析,计算了合金的热变形激活能,构建并分析了合金的热加工图。结果表明:两种合金的真应力真应变曲线都表现出动态再结晶的一般特征。添加Y后,合金的流变应力增高;在低温高应变速率(350℃,0.002 s^(-1))变形时,合金易出现45°角剪切断裂;在400℃变形时,在动态再结晶的晶界处析出第二相,添加Y后GW124K合金动态析出相的数量明显增多;在500℃变形时,发生完全动态再结晶,GW124K合金的再结晶晶粒尺寸(25μm)明显小于GW120K合金(40μm);GW120K合金的热变形激活能为218.788 k J·mol^(-1),添加Y后合金的热变形激活能增高至243.530 k J·mol^(-1);Mg-12Gd-(4Y)-0.5Zr两种合金的失稳区集中在低温高应变区域,添加Y后,合金的失稳区增大,可加工区域减小。
基金financially supported by the National Natural Science Foundation of China(No.52371108,52201119,52203295)Frontier Exploration Project of Longmen Laboratory,China(LMQYTSKT014)the Joint Fund of Henan Science and Technology R&D Plan of China(242103810056)。
文摘A high-strength magnesium alloy containing Yb was prepared through a simple hot extrusion process.The effect of Yb addition on dynamic precipitation,texture evolution,dynamic recrystallization mechanisms,deformation mechanisms,and strengthening mechanisms in as-extruded Mg-4 Sm-3 Gd(-2 Yb)-0.5 Zr(SGY0,SGY2)alloys was systematically investigated.The results indicated that the average grain size decreased from 4.17μm to 1.48μm with the addition of Yb.This extreme grain refinement greatly enhances the strength.The addition of Yb significantly facilitated the phase precipitation,but did not change the texture type.The non-dynamic recrystallized(un DRXed)grains exhibited a strong basal plane texture of<0110>parallel to the extrusion direction(ED),while the dynamic recrystallized(DRXed)grains showed a weaker rare earth texture,characterized by<1212>//ED.Moreover,the as-extruded SGY0 and SGY2 alloys predominantly undergo continuous dynamic recrystallization(CDRX),and some DRXed grains exhibit a discontinuous dynamic recrystallization mechanism(DDRX).In addition,the addition of Yb facilitates the activation of non-basal plane slip.The dislocation types in the as-extruded SGY0 and SGY2 alloys include(a),(c)and(c+a)dislocations.However,the SGY2 alloy exhibits a relatively high dislocation density,which contributes to the enhancement of the strength.Extreme grain refinement and the dispersion of nanoscale second-phase particles are key factors in increasing the strength.
基金Project supported by the National Natural Science Foundation of China(22268003,52272287)。
文摘It is anticipated to remove highly hazardous tetracycline antibiotic from aqueous solution photocatalytically by using Gd doped spinal ferrite.In this work,both ZnFe_(2)O_(4)and Gd doped ZnFe_(2)O_(4)photocatalysts were hydrothermally fabricated and characterized by different techniques.The spherical photocatalysts show extended photocatalytic removal efficiency under visible light.The optimized sample(ZnFe_(1.96)Cd_(0.04)O_(4))removes 78%antibiotic in 80 min.Moreover,under simulated solar light irradiation,the rate of hydrogen produced from water splitting photocatalysis with ZnFe_(1.96)Cd_(0.04)O_(4)reaches 230.4μmol/(g h).These increased activities are attributed to the increased specific surface area,the expanded light absorption range and the enhanced charge separation realized by doping Gd.According to the charge trapping study,both superoxide(·O_(2)^(-))and hydroxyl radicals(·OH)were the major active species in the process of removing antibiotic.This research provides a feasible way to fabricate low cost photocatalysts for the eradication of highly hazardous pollutants from aqueous solution.
