一个三角不等式的指数推广

建立一个含指数参数的三角形不等式。     

Renal insufficiency is an independent predictor of in-hospital mortality for patients with acute myocardial infarction receiving primary percutaneous coronary intervention

Objective:To investigate the relationship between renal function and clinical outcomes among patients with acute ST-segment elevation myocardial infarction (ASTEMI), who were treated with emergency percutaneous coronary intervention (PCI). Methods: 420 patients hospitalized in Peking University First Hospital, diagnosed with ASTEMI treated with emergency (PCI) from January 2001 to June 2011 were enrolled in this study. Estimated glomerular filtration rate (eGFR) was used as a measure of renal function. We compared the clinical parameters and outcomes between ASTEMI patients combined renal insufficiency and the patients with normal renal function. Results:There was a significant increase in the concentrations of fibrinogen and D-Dimer (P<0.05) and a much higher morbidity of diabetes mellitus in the group of patients with chronic kidney disease (CKD; eGFR<60 ml/(min·1.73 m2)) (P<0.01). CKD (eGFR<60 ml/(min·1.73 m2)) was an independent predictor of in-hospital mortality for patients hospitalized with ASTEMI receiving PCI therapy rapidly (P=0.032, odds ratio (OR) 4.159, 95% confidence interval (CI) 1.127-15.346). Conclusions:Renal insufficiency is an independent predictor of in-hospital mortality for patients hospitalized with ASTEMI treated with primary PCI.     

Analysis of a functionally graded piezothermoelastic hollow cylinder

INTRODUCTION Piezoelectric symmetric structures always play an important role in the use of piezoelectric materials (Olesiak and Pyryev, 1995; Ding et al., 2003; Wu et al., 2003). To improve the durability of this kind of piezoelectric structures, functionally gradient piezo- electric materials (FGPM) have been developed and used to produce these devices such as sensors and actuators (Hauke et al., 2000; Zhu et al., 1995). For the case when a rectangular plate made of function- ally gr…     

求y=a／（f（x）＋b）类函数值域的不等式法

以于形如y=a/(f(x) b)(a,b为常数，且a≠0）一类函数，其中f(x)∈G(G为f(x)的取值范围，通过一些实例，介绍其值域的一种新求法，即不等式法，同时，通过每个实例评注，以辩析新方法与原解法各自的优缺点。     

意义的任意关系论

原有的意义的关系论过于简单和晦涩,存在诸多混淆。而且,无论从情境上讲,还是从制约上讲,原有的意义的关系论都是意义的约束关系论,它仅强调阐释和刻画语言表达式的惯常意义,而不重视阐释和刻画其逆向意义。相反,意义的任意关系论则在理清原有的关系论的基础上,放宽对情境和制约的约束条件,既可以从哲学上阐释任何语言表达式的任何情境意义,又可以促进它们的情境意义的技术刻画,促进情境语义学的迅速发展。     

Mn半群的一些子半群

本文研究了全体n阶矩阵Mn关于乘法的半群的一些子半群.主要证明了以下结论：全体n阶对角矩阵Dn是Mn的一个子半群,是正则＊-半群,是一个逆半群,是一个完全正则半群;Qn={Eij│i=1,2,…,n;j=1,2,…,n}∪{0}是Mn的一个子半群,是正则＊-半群,是一个逆半群.     

线性方程组教学中应注意的几个问题

本文通过几个例题讨论了在线性方程组的教学中应注意线性方程组矩阵表达式的强化,线性方程组的反问题等方面的问题,以便提高教学效果.     

介绍一个Wilkr型不等式

利用微分方法和三角函数的幂级数展开式,本文得到一个新的Wilker型不等式,其中的系数是最佳的.     

关于拉氏逆变换延迟性质的探讨

由分析讨论拉氏变换延迟性质的应用,得出拉氏逆变换延迟性质的结论,同时给出了拉氏逆变换延迟性质的一个推论,并且对它们进行了证明.     

一类单叶函数的Fekete-Szeg不等式

设 f(z)=z+a_2z~2+a_3z~3+…∈F_λ~*(α,β),其中 F_λ~*(α,β)是利用 Ruscheweyh 导数 D~λf(z)定义了一个新的函数类,研究并得到了|a_3-μa_2~2|的准确上界．