The discretization size is limited by the sampling theorem, and the limit is one half of the wavelength of the highest frequency of the problem. However, one half of the wavelength is an ideal value. In general, the d...The discretization size is limited by the sampling theorem, and the limit is one half of the wavelength of the highest frequency of the problem. However, one half of the wavelength is an ideal value. In general, the discretization size that can ensure the accuracy of the simulation is much smaller than this value in the traditional finite element method. The possible reason of this phenomenon is analyzed in this paper, and an efficient method is given to improve the simulation accuracy.展开更多
为研究含能材料变泊松比粘弹力学行为,基于热流变简单材料假设,建立了一种采用时间相关泊松比的三维热粘弹性本构方程;利用积分算法对该本构进行数值离散,给出了相应的应力更新方法;基于 Abaqus 软件 UMAT 接口技术编制了相应材料子程序...为研究含能材料变泊松比粘弹力学行为,基于热流变简单材料假设,建立了一种采用时间相关泊松比的三维热粘弹性本构方程;利用积分算法对该本构进行数值离散,给出了相应的应力更新方法;基于 Abaqus 软件 UMAT 接口技术编制了相应材料子程序,完成了算例分析。结果表明,数值解与对应解析解吻合良好,并通过了合理性算例验证,分析方法及算法程序有效,可为后续三维装药精细结构完整性分析提供支持;粘弹材料泊松比具有时间相关性,其较小变化对计算结果影响显著,尤其是在短时加载或状态转变过程。展开更多
Background At present,patients with chronic heart failure complicated with diabetes are often treated with drugs in clinical practice.Most patients cannot adhere to regular and quantitative medication for a long time,...Background At present,patients with chronic heart failure complicated with diabetes are often treated with drugs in clinical practice.Most patients cannot adhere to regular and quantitative medication for a long time,and their poor compliance has adverse effects on their rehabilitation.The aim of this study was to explore the application effects of integrated medical and nursing rehabilitation in the management of patients with chronic heart failure and diabetes.Methods A total of 75 patients with chronic heart failure and diabetes,admitted to our center from May 2020 to May 2023,were randomly divided into Group A(n=38)and Group B(n=37)using a random number table.Group A received integrated rehabilitation management,while Group B received conventional rehabilitation management.The left ventricular ejection fraction(LVEF),left ventricular end-diastolic diameter(LVEDD),left ventricular end-systolic diameter(LVESD),fasting blood glucose(FBG),2-hour postprandial blood glucose(2h PG),glycated hemoglobin(Hb Alc),and self-care ability were compared between the two groups before and after intervention.Results After intervention,the LVEDD and LVESD in both groups were lower than before,while LVEF was higher than before(P<0.05).The LVEDD and LVESD in Group A were lower than in Group B after intervention,while LVEF was higher than in Group B(P<0.05).After intervention,the levels of FBG,2h PG,Hb Alc,and the scores of the European Heart Failure Self-care Behavior Scale(EHFSc B-9)in both groups decreased,with Group A being lower than Group B(P<0.05).Conclusions Integrated medical and nursing rehabilitation can effectively improve the cardiac function and blood glucose levels of patients with chronic heart failure and diabetes,control the patients’condition,and enhance their quality of life and self-care ability.[S Chin J Cardiol 2024;25(1):44-49]展开更多
文摘The discretization size is limited by the sampling theorem, and the limit is one half of the wavelength of the highest frequency of the problem. However, one half of the wavelength is an ideal value. In general, the discretization size that can ensure the accuracy of the simulation is much smaller than this value in the traditional finite element method. The possible reason of this phenomenon is analyzed in this paper, and an efficient method is given to improve the simulation accuracy.
文摘为研究含能材料变泊松比粘弹力学行为,基于热流变简单材料假设,建立了一种采用时间相关泊松比的三维热粘弹性本构方程;利用积分算法对该本构进行数值离散,给出了相应的应力更新方法;基于 Abaqus 软件 UMAT 接口技术编制了相应材料子程序,完成了算例分析。结果表明,数值解与对应解析解吻合良好,并通过了合理性算例验证,分析方法及算法程序有效,可为后续三维装药精细结构完整性分析提供支持;粘弹材料泊松比具有时间相关性,其较小变化对计算结果影响显著,尤其是在短时加载或状态转变过程。
基金supported by the Natural Science Foundation of Hunan Province(No.2021JJ40505)。
文摘Background At present,patients with chronic heart failure complicated with diabetes are often treated with drugs in clinical practice.Most patients cannot adhere to regular and quantitative medication for a long time,and their poor compliance has adverse effects on their rehabilitation.The aim of this study was to explore the application effects of integrated medical and nursing rehabilitation in the management of patients with chronic heart failure and diabetes.Methods A total of 75 patients with chronic heart failure and diabetes,admitted to our center from May 2020 to May 2023,were randomly divided into Group A(n=38)and Group B(n=37)using a random number table.Group A received integrated rehabilitation management,while Group B received conventional rehabilitation management.The left ventricular ejection fraction(LVEF),left ventricular end-diastolic diameter(LVEDD),left ventricular end-systolic diameter(LVESD),fasting blood glucose(FBG),2-hour postprandial blood glucose(2h PG),glycated hemoglobin(Hb Alc),and self-care ability were compared between the two groups before and after intervention.Results After intervention,the LVEDD and LVESD in both groups were lower than before,while LVEF was higher than before(P<0.05).The LVEDD and LVESD in Group A were lower than in Group B after intervention,while LVEF was higher than in Group B(P<0.05).After intervention,the levels of FBG,2h PG,Hb Alc,and the scores of the European Heart Failure Self-care Behavior Scale(EHFSc B-9)in both groups decreased,with Group A being lower than Group B(P<0.05).Conclusions Integrated medical and nursing rehabilitation can effectively improve the cardiac function and blood glucose levels of patients with chronic heart failure and diabetes,control the patients’condition,and enhance their quality of life and self-care ability.[S Chin J Cardiol 2024;25(1):44-49]
