Mg-xwt.%CuY (x=15, 20, 25) composites were successfully prepared by reactive mechanical alloying (RMA). X-ray diffraction (XRD) measurement shows that main phases of the as milled composites are MgH2 and Mg2Cu, and th...Mg-xwt.%CuY (x=15, 20, 25) composites were successfully prepared by reactive mechanical alloying (RMA). X-ray diffraction (XRD) measurement shows that main phases of the as milled composites are MgH2 and Mg2Cu, and they converted into Mg and MgCu2 after dehydrogenation, respectively. Pressure-Composition-Isotherm (PCI) test shows that the composites exhibit double pressure plateau at each isothermal desorption process. The hydrogen absorption and desorption kinetics of the composites become worse with increasing x content, indicating that Mg-Cu phase has a negative effect on the hydrogen sorption properties of the composites. It is supposed that the good hydrogen sorption properties of the composites attribute to the catalyst effect of yttrium hydride distributed in Mg substrate and the particles size reduction and crystal defects formed by RMA.展开更多
针对目标函数中包含耦合函数H(x,y)的非凸非光滑极小化问题,提出了一种线性惯性交替乘子方向法(Linear Inertial Alternating Direction Method of Multipliers,LIADMM)。为了方便子问题的求解,对目标函数中的耦合函数H(x,y)进行线性化...针对目标函数中包含耦合函数H(x,y)的非凸非光滑极小化问题,提出了一种线性惯性交替乘子方向法(Linear Inertial Alternating Direction Method of Multipliers,LIADMM)。为了方便子问题的求解,对目标函数中的耦合函数H(x,y)进行线性化处理,并在x-子问题中引入惯性效应。在适当的假设条件下,建立了算法的全局收敛性;同时引入满足Kurdyka-Lojasiewicz不等式的辅助函数,验证了算法的强收敛性。通过两个数值实验表明,引入惯性效应的算法比没有惯性效应的算法收敛性能更好。展开更多
Background The clinical significance of Y-H2AX in laryngeal squamous cell carcinoma （LSCC） has not yet been established. This study was performed to assess the expression of nuclear y-H2AX in benign and malignant la...Background The clinical significance of Y-H2AX in laryngeal squamous cell carcinoma （LSCC） has not yet been established. This study was performed to assess the expression of nuclear y-H2AX in benign and malignant laryngeal lesions and to assess its clinicopathological significance. Methods A total of 70 LSCC tumor-normal tissue paired samples were evaluated for y-H2AX expression using immunohistochemical staining. Their expression was correlated with different clinicopathological parameters. Results Nuclear Y-H2AX expression was frequently detected in LSCC tissues （P 〈0.001）. High nuclear Y-H2AX levels were not associated with any clinicopathological characteristics of LSCC （P 〉0.05）. Univariate Kaplan-Meier analysis showed that positive nuclear Y-H2AX expression was associated with a decreased overall survival （P=0.017）. Multivariate Cox regression analysis showed that nuclear Y-H2AX expression was an independent risk factor for overall survival. Conclusion The expression of nuclear Y-H2AX might be closely related to the prognosis of LSCC. Chin Med J 2014;127 （14）： 2664-2667展开更多
文摘Mg-xwt.%CuY (x=15, 20, 25) composites were successfully prepared by reactive mechanical alloying (RMA). X-ray diffraction (XRD) measurement shows that main phases of the as milled composites are MgH2 and Mg2Cu, and they converted into Mg and MgCu2 after dehydrogenation, respectively. Pressure-Composition-Isotherm (PCI) test shows that the composites exhibit double pressure plateau at each isothermal desorption process. The hydrogen absorption and desorption kinetics of the composites become worse with increasing x content, indicating that Mg-Cu phase has a negative effect on the hydrogen sorption properties of the composites. It is supposed that the good hydrogen sorption properties of the composites attribute to the catalyst effect of yttrium hydride distributed in Mg substrate and the particles size reduction and crystal defects formed by RMA.
文摘针对目标函数中包含耦合函数H(x,y)的非凸非光滑极小化问题,提出了一种线性惯性交替乘子方向法(Linear Inertial Alternating Direction Method of Multipliers,LIADMM)。为了方便子问题的求解,对目标函数中的耦合函数H(x,y)进行线性化处理,并在x-子问题中引入惯性效应。在适当的假设条件下,建立了算法的全局收敛性;同时引入满足Kurdyka-Lojasiewicz不等式的辅助函数,验证了算法的强收敛性。通过两个数值实验表明,引入惯性效应的算法比没有惯性效应的算法收敛性能更好。
文摘Background The clinical significance of Y-H2AX in laryngeal squamous cell carcinoma （LSCC） has not yet been established. This study was performed to assess the expression of nuclear y-H2AX in benign and malignant laryngeal lesions and to assess its clinicopathological significance. Methods A total of 70 LSCC tumor-normal tissue paired samples were evaluated for y-H2AX expression using immunohistochemical staining. Their expression was correlated with different clinicopathological parameters. Results Nuclear Y-H2AX expression was frequently detected in LSCC tissues （P 〈0.001）. High nuclear Y-H2AX levels were not associated with any clinicopathological characteristics of LSCC （P 〉0.05）. Univariate Kaplan-Meier analysis showed that positive nuclear Y-H2AX expression was associated with a decreased overall survival （P=0.017）. Multivariate Cox regression analysis showed that nuclear Y-H2AX expression was an independent risk factor for overall survival. Conclusion The expression of nuclear Y-H2AX might be closely related to the prognosis of LSCC. Chin Med J 2014;127 （14）： 2664-2667
