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．     

Hadamard不等式改进的新证明

用较初等简捷的方法给出Hadamard不等式的改进的一个新证明，得出相关定理、引理和推论。     

排序定理和Chebyshev不等式的对偶及其推广

给出了排序定理和Chebyshev不等式的对偶定理,并对排序定理、Chebyshev不等式及其对偶定理进行了推广.     

λ-矩阵的矩阵函数

定义了λ-矩阵的矩阵函数,并给出了它可逆的条件,计算它的行列式以及特征向量与特征值的方法.     

A nonlinear inverse problem in estimating simultaneously the external forces for a vibration system with displacement-dependent parameters

The conjugate gradient method (CGM), or the iterative regularization method, is applied to a generalized inverse nonlinear force vibration problem, (i.e. system parameters are function of displacement), to simultaneously estimate the unknown time-dependent external forces for a multiple-degree-of-freedom damped system by using the measured displacements. The system parameters of the present study are considered function of displacement, thus it is classified as a genuine nonlinear inverse vibration problem. The numerical experiments are performed to test the validity of CGM by using different types of system parameters, external forces and measurement errors in this study.     

Education,horizontal inequalities and ethnic relations in Nigeria

The article focuses on the role of higher education in generating or mitigating inequality among ethno-regional groups and its impact on ethnic relations with evidence from Nigeria. It shows that access to education in Nigeria has been politicised. This is because of the perceived role of education in engendering political and socio-economic inequalities. It assesses the intervention mechanisms of successive Nigerian governments at federal and state levels to expand access to and enhance equity in educational opportunities as well as the responses of the different publics to such programmes. The article shows that although educational inequalities persist, state policies have enhanced the ability of the different ethno-regional groups to produce qualified personnel to occupy critical public service positions. Thus, conflicts that were historically traced to the domination of the public sector of some regions by personnel from other regions have been averted. The Nigerian case study therefore suggests that while policies aimed at equalising access to education may create incentives for ethno-regional mobilisations, they are nevertheless necessary to prevent violent conflicts that arise from perceived ethno-regional domination of the public sector.     

Neighborhood inequality in the prevalence of reported and substantiated child maltreatment

BackgroundPrior research documents spatial concentration in the incidence of child maltreatment reported to and confirmed by Child Protective Services (CPS), but without estimates of the prevalence of such reports, the extent of CPS contact in different communities is unknown.ObjectiveTo estimate the prevalence of CPS reports during early childhood and substantiated investigations during childhood for children living in different types of neighborhoods.Participants and settingChildren who experienced CPS reports and substantiated investigations in Connecticut.MethodsThis study uses synthetic cohort life tables to estimate the cumulative risk of CPS reports before age five and substantiated CPS investigations before age 18, by neighborhood poverty rate and neighborhood racial composition.ResultsThe analysis reveals substantial stratification in the prevalence of CPS contact by the demographic characteristics of children’s residential neighborhoods. For example, while 7% of children in low-poverty neighborhoods (under 10% poor) experience a substantiated CPS investigation at some point during childhood at 2014 and 2015 rates, this risk more than doubles to 17% for their peers in moderate-poverty neighborhoods (10–20% poor) and more than triples to 26% for their peers in high-poverty neighborhoods (over 20% poor). Similar trends emerge when examining CPS reports in early childhood as well as when comparing neighborhoods with different proportions of White residents.ConclusionsCPS reports and substantiated investigations are a widespread and disproportionately experienced life event for children in poor neighborhoods and children in non-White neighborhoods.     

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。     

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.     

一个涉及三个三角形的三元二次型不等式

应用文献[1]的一个推论,建立了一个新的涉及三个三角形的三元二次型三角不等式,讨论了这一不等式的应用,解决了文献[1]中提出的一个猜想,提出了两个尚待解决的猜想。