目的应用沿血管周围间隙的扩散张量图像分析技术(DTI-ALPS)检测新诊断2型糖尿病(T2DM)患者脑胶质淋巴系统功能,探讨其与胰岛素抵抗指数(HOMA-IR)的相关性。方法选取徐州医科大学附属医院2023年4~6月临床确诊的新诊断的T2DM患者30例作为...目的应用沿血管周围间隙的扩散张量图像分析技术(DTI-ALPS)检测新诊断2型糖尿病(T2DM)患者脑胶质淋巴系统功能,探讨其与胰岛素抵抗指数(HOMA-IR)的相关性。方法选取徐州医科大学附属医院2023年4~6月临床确诊的新诊断的T2DM患者30例作为新诊断T2DM组,同时选取本院体检的与新诊断T2DM组年龄、性别相匹配的健康人30例为对照组。收集受试者临床检验指标(糖化血红蛋白、空腹血糖、空腹胰岛素水平),选取稳态模型作为评估胰岛素抵抗的指数,计算得出胰岛素抵抗HOMA-IR指数。采用3.0T核磁共振对60例受试者进行扫描,利用DTI计算ALPS指数,比较两组间的差异。采用Pearson相关性分析新诊断T2DM组HOMA-IR与ALPS指数之间的相关性。结果新诊断T2DM组空腹血糖、空腹胰岛素、糖化血红蛋白、HOMA-IR高于正常对照组(P<0.05)。新诊断T2DM组ALPS指数下降(1.50±0.22 vs 1.31±0.18,P<0.001),与HOMA-IR呈负相关(r=-0.622,P<0.001)。结论DTI-ALPS技术可用于评估新诊断T2DM患者的胶质淋巴系统功能,其功能的下降与胰岛素抵抗密切相关。展开更多
The analytical mathematical solutions of gas concentration and fractional gas loss for the diffusion of gas in a cylindrical coal sample were given with detailed mathematical derivations by assuming that the diffusion...The analytical mathematical solutions of gas concentration and fractional gas loss for the diffusion of gas in a cylindrical coal sample were given with detailed mathematical derivations by assuming that the diffusion of gas through the coal matrix is concentration gradient-driven and obeys the Fick’s Second Law of Diffusion.The analytical solutions were approximated in case of small values of time and the error analyses associated with the approximation were also undertaken.The results indicate that the square root relationship of gas release in the early stage of desorption,which is widely used to provide a simple and fast estimation of the lost gas,is the first term of the approximation,and care must be taken in using the square root relationship as a significant error might be introduced with increase in the lost time and decrease in effective diameter of a cylindrical coal sample.展开更多
The void diffusion model for mining-effected strata can be analyzed by means of a nonlinear finite element method. This paper presents the fundamental principles of the analyses. The key to the analyses is the determi...The void diffusion model for mining-effected strata can be analyzed by means of a nonlinear finite element method. This paper presents the fundamental principles of the analyses. The key to the analyses is the determination of roof subsidence and the nonlinear relationship between diffusion coefficient and subsidence. This paper discusses these problems and determines the coefficient for Pingdingshan mining district, with which several profiles are predicted. It is found that the predicted profiles are coincident with the corresponding field profiles.展开更多
In order to study the influence of parameters on durability of marine concrete structures, the parameter＇s sensitivity analysis was studied in this paper. With the Fick＇s 2nd law of diffusion and the deterministic s...In order to study the influence of parameters on durability of marine concrete structures, the parameter＇s sensitivity analysis was studied in this paper. With the Fick＇s 2nd law of diffusion and the deterministic sensitivity analysis method （DSA）, the sensitivity factors of apparent surface chloride content, apparent chloride diffusion coefficient and its time dependent attenuation factor were analyzed. The results of the analysis show that the impact of design variables on concrete durability was different. The values of sensitivity factor of chloride diffusion coefficient and its time dependent attenuation factor were higher than others. Relative less error in chloride diffusion coefficient and its time dependent attenuation coefficient induces a bigger error in concrete durability design and life prediction. According to probability sensitivity analysis （PSA）, the influence of mean value and variance of concrete durability design variables on the durability failure probability was studied. The results of the study provide quantitative measures of the importance of concrete durability design and life prediction variables. It was concluded that the chloride diffusion coefficient and its time dependent attenuation factor have more influence on the reliability of marine concrete structural durability. In durability design and life prediction of marine concrete structures, it was very important to reduce the measure and statistic error of durability design variables.展开更多
文摘目的应用沿血管周围间隙的扩散张量图像分析技术(DTI-ALPS)检测新诊断2型糖尿病(T2DM)患者脑胶质淋巴系统功能,探讨其与胰岛素抵抗指数(HOMA-IR)的相关性。方法选取徐州医科大学附属医院2023年4~6月临床确诊的新诊断的T2DM患者30例作为新诊断T2DM组,同时选取本院体检的与新诊断T2DM组年龄、性别相匹配的健康人30例为对照组。收集受试者临床检验指标(糖化血红蛋白、空腹血糖、空腹胰岛素水平),选取稳态模型作为评估胰岛素抵抗的指数,计算得出胰岛素抵抗HOMA-IR指数。采用3.0T核磁共振对60例受试者进行扫描,利用DTI计算ALPS指数,比较两组间的差异。采用Pearson相关性分析新诊断T2DM组HOMA-IR与ALPS指数之间的相关性。结果新诊断T2DM组空腹血糖、空腹胰岛素、糖化血红蛋白、HOMA-IR高于正常对照组(P<0.05)。新诊断T2DM组ALPS指数下降(1.50±0.22 vs 1.31±0.18,P<0.001),与HOMA-IR呈负相关(r=-0.622,P<0.001)。结论DTI-ALPS技术可用于评估新诊断T2DM患者的胶质淋巴系统功能,其功能的下降与胰岛素抵抗密切相关。
基金provided by the Science and Technology Grant of Huainan City of China (No.2013A4001)the Key Research Grant of Shanxi Province of China (No.201303027-1)
文摘The analytical mathematical solutions of gas concentration and fractional gas loss for the diffusion of gas in a cylindrical coal sample were given with detailed mathematical derivations by assuming that the diffusion of gas through the coal matrix is concentration gradient-driven and obeys the Fick’s Second Law of Diffusion.The analytical solutions were approximated in case of small values of time and the error analyses associated with the approximation were also undertaken.The results indicate that the square root relationship of gas release in the early stage of desorption,which is widely used to provide a simple and fast estimation of the lost gas,is the first term of the approximation,and care must be taken in using the square root relationship as a significant error might be introduced with increase in the lost time and decrease in effective diameter of a cylindrical coal sample.
文摘The void diffusion model for mining-effected strata can be analyzed by means of a nonlinear finite element method. This paper presents the fundamental principles of the analyses. The key to the analyses is the determination of roof subsidence and the nonlinear relationship between diffusion coefficient and subsidence. This paper discusses these problems and determines the coefficient for Pingdingshan mining district, with which several profiles are predicted. It is found that the predicted profiles are coincident with the corresponding field profiles.
文摘In order to study the influence of parameters on durability of marine concrete structures, the parameter＇s sensitivity analysis was studied in this paper. With the Fick＇s 2nd law of diffusion and the deterministic sensitivity analysis method （DSA）, the sensitivity factors of apparent surface chloride content, apparent chloride diffusion coefficient and its time dependent attenuation factor were analyzed. The results of the analysis show that the impact of design variables on concrete durability was different. The values of sensitivity factor of chloride diffusion coefficient and its time dependent attenuation factor were higher than others. Relative less error in chloride diffusion coefficient and its time dependent attenuation coefficient induces a bigger error in concrete durability design and life prediction. According to probability sensitivity analysis （PSA）, the influence of mean value and variance of concrete durability design variables on the durability failure probability was studied. The results of the study provide quantitative measures of the importance of concrete durability design and life prediction variables. It was concluded that the chloride diffusion coefficient and its time dependent attenuation factor have more influence on the reliability of marine concrete structural durability. In durability design and life prediction of marine concrete structures, it was very important to reduce the measure and statistic error of durability design variables.
