试验Cr14-Co13-Mo5-Ni2齿轮钢由5 t VIM+1 t VAR双真空冶炼,利用Gleeble-1500热模拟机试验研究了Cr14-Co13-Mo5-Ni2钢形变温度(1 040~1 080℃),形变量(20%~60%)和形变速率1~20 s^(-1)对钢的晶粒尺寸的影响。结果表明,形变温度1040℃、...试验Cr14-Co13-Mo5-Ni2齿轮钢由5 t VIM+1 t VAR双真空冶炼,利用Gleeble-1500热模拟机试验研究了Cr14-Co13-Mo5-Ni2钢形变温度(1 040~1 080℃),形变量(20%~60%)和形变速率1~20 s^(-1)对钢的晶粒尺寸的影响。结果表明,形变温度1040℃、形变量60%、形变速率20 s^(-1)时,Cr14-Co13-Mo5-Ni2齿轮钢具有细小圆整均匀的晶粒组织,晶粒平均尺寸为4.03μm。展开更多
A modified cellular automaton(CA) program was developed to simulate the process of dynamic recrystallization(DRX) for 23Co13Ni11Cr3Mo ultrahigh strength steel.In this model,influences of deformation parameters on hard...A modified cellular automaton(CA) program was developed to simulate the process of dynamic recrystallization(DRX) for 23Co13Ni11Cr3Mo ultrahigh strength steel.In this model,influences of deformation parameters on hardening rate and solute drag effect were considered.Moreover,an inverse analysis method was proposed for parameters identification of dislocation model and solute drag effect based on the results of isothermal compression tests on Gleeble-1500.Then,simulated microstructures under different deformation conditions were compared with those of experiments.A good agreement is achieved.Furthermore,influences of deformation parameters on microstructure evolution for 23Co13Ni11Cr3Mo steel were investigated in details.High strain is an effective measure to refine grain and improve homogeneity.Meanwhile,the desired deformation parameters are temperature of 1000-1050 °C and strain rate of 0.008-0.01 s-1 for obtaining grains smaller than 22.5 μm.展开更多
The attempt to study magnetism in (n,m) chiral space of single-walled carbon nanotubes (SWNTs) with embedded metal cluster is presented. Co13 metallic cluster inside zigzag and chiral single-walled nanotubes was inves...The attempt to study magnetism in (n,m) chiral space of single-walled carbon nanotubes (SWNTs) with embedded metal cluster is presented. Co13 metallic cluster inside zigzag and chiral single-walled nanotubes was investigated using density functional theory (DFT). Magnetic properties of the endohedral nanotubes with the various chiral index (n,m) were characterized by calculation of the total spin magnetic moment (S). The dependence of S on the chiral symmetry of nanotubes, as well as the orientation of Co13 cluster within nanotubes was found. Longitudinal orientation of icosahedral Co13 cluster was preferable for magnetization in general. However, it was shown that the magnetic landscape M = f(n,m) of endohedral nanotubes is very complex and sharp.展开更多
Objective:To explore the clinical efficacy and mechanism of auricular point sticking plus Western medicine for moderate gastric cancer pain.Methods:A total of 80 patients were selected and divided into an observation ...Objective:To explore the clinical efficacy and mechanism of auricular point sticking plus Western medicine for moderate gastric cancer pain.Methods:A total of 80 patients were selected and divided into an observation group and a control group according to the random number table method,with 40 cases in each group.Patients in the control group received Western medicine treatment,while patients in the observation group received additional auricular point sticking.Both groups were treated for 2 weeks.Numeric rating scale(NRS)and Karnofsky performance status(KPS)were adopted before and after treatment.The total time and times of flare-up pain in 24 h were recorded.The cyclooxygenase-2(COX-2)and tumor necrosis factor-α(TNF-α)levels were detected.The clinical efficacy of both groups was evaluated after treatment.Results:The total effective rate of the observation group was significantly higher than that of the control group(P<0.05);after treatment,NRS scores of both groups were significantly lower than those before treatment(both P<0.05),and the score of the observation group was lower than that of the control group(P<0.05);KPS scores of both groups were significantly higher than those before treatment(both P<0.05),and the score of the observation group was higher than that of the control group(P<0.05).After treatment,the total time and flare-up times of pain during 24 h of both groups were significantly reduced(all P<0.05),and those of the observation group were significantly less than those of the control group(both P<0.05).After treatment,the COX-2 and TNF-αlevels of both groups were significantly reduced(all P<0.05),and were lower in the observation group than in the control group(all P<0.05).Conclusion:The clinical efficacy of auricular point sticking plus Western medicine for moderate gastric cancer pain is valid.This combined treatment can alleviate cancer pain and improve patients'quality of life,which may be related to its ability to reduce COX-2 and TNF-αlevels.展开更多
文摘试验Cr14-Co13-Mo5-Ni2齿轮钢由5 t VIM+1 t VAR双真空冶炼,利用Gleeble-1500热模拟机试验研究了Cr14-Co13-Mo5-Ni2钢形变温度(1 040~1 080℃),形变量(20%~60%)和形变速率1~20 s^(-1)对钢的晶粒尺寸的影响。结果表明,形变温度1040℃、形变量60%、形变速率20 s^(-1)时,Cr14-Co13-Mo5-Ni2齿轮钢具有细小圆整均匀的晶粒组织,晶粒平均尺寸为4.03μm。
基金Project(2011CB706802)supported by the National Basic Research Program of ChinaProject(2012ZX04010-081)supported by National Science and Technology Major Program of China
文摘A modified cellular automaton(CA) program was developed to simulate the process of dynamic recrystallization(DRX) for 23Co13Ni11Cr3Mo ultrahigh strength steel.In this model,influences of deformation parameters on hardening rate and solute drag effect were considered.Moreover,an inverse analysis method was proposed for parameters identification of dislocation model and solute drag effect based on the results of isothermal compression tests on Gleeble-1500.Then,simulated microstructures under different deformation conditions were compared with those of experiments.A good agreement is achieved.Furthermore,influences of deformation parameters on microstructure evolution for 23Co13Ni11Cr3Mo steel were investigated in details.High strain is an effective measure to refine grain and improve homogeneity.Meanwhile,the desired deformation parameters are temperature of 1000-1050 °C and strain rate of 0.008-0.01 s-1 for obtaining grains smaller than 22.5 μm.
文摘The attempt to study magnetism in (n,m) chiral space of single-walled carbon nanotubes (SWNTs) with embedded metal cluster is presented. Co13 metallic cluster inside zigzag and chiral single-walled nanotubes was investigated using density functional theory (DFT). Magnetic properties of the endohedral nanotubes with the various chiral index (n,m) were characterized by calculation of the total spin magnetic moment (S). The dependence of S on the chiral symmetry of nanotubes, as well as the orientation of Co13 cluster within nanotubes was found. Longitudinal orientation of icosahedral Co13 cluster was preferable for magnetization in general. However, it was shown that the magnetic landscape M = f(n,m) of endohedral nanotubes is very complex and sharp.
文摘Objective:To explore the clinical efficacy and mechanism of auricular point sticking plus Western medicine for moderate gastric cancer pain.Methods:A total of 80 patients were selected and divided into an observation group and a control group according to the random number table method,with 40 cases in each group.Patients in the control group received Western medicine treatment,while patients in the observation group received additional auricular point sticking.Both groups were treated for 2 weeks.Numeric rating scale(NRS)and Karnofsky performance status(KPS)were adopted before and after treatment.The total time and times of flare-up pain in 24 h were recorded.The cyclooxygenase-2(COX-2)and tumor necrosis factor-α(TNF-α)levels were detected.The clinical efficacy of both groups was evaluated after treatment.Results:The total effective rate of the observation group was significantly higher than that of the control group(P<0.05);after treatment,NRS scores of both groups were significantly lower than those before treatment(both P<0.05),and the score of the observation group was lower than that of the control group(P<0.05);KPS scores of both groups were significantly higher than those before treatment(both P<0.05),and the score of the observation group was higher than that of the control group(P<0.05).After treatment,the total time and flare-up times of pain during 24 h of both groups were significantly reduced(all P<0.05),and those of the observation group were significantly less than those of the control group(both P<0.05).After treatment,the COX-2 and TNF-αlevels of both groups were significantly reduced(all P<0.05),and were lower in the observation group than in the control group(all P<0.05).Conclusion:The clinical efficacy of auricular point sticking plus Western medicine for moderate gastric cancer pain is valid.This combined treatment can alleviate cancer pain and improve patients'quality of life,which may be related to its ability to reduce COX-2 and TNF-αlevels.
