一类多元Gauss-Weierstrass算子线性组合的加权逼近

该文给出了一类多元Gauss-Weierstrass算子线性组合加Jacobi权在一致逼近下的正、逆定理和逼近阶的特征刻划     

理想点法综合评价学生数学成绩

应用多目标决策———理想点法 ,建立了一个综合评价学生数学成绩的数学模型     

Zr(SO4)2/TiO2固体超强酸的结构表征

采用一步法制得Zr(SO4)2/TiO2型固体超强酸,用FT-IR,XRD及TG/DTA等技术对其结构进行了表征,并且通过乙酸丁酯酯化反应考察了其催化性能.结果显示:添加TiO2后,催化剂表面氧化物的晶型结构主要是锐钛矿型的TiO2,没有观察到Zr(SO4)2的晶型衍射峰,Zr(SO4)2以无定型形式存在.酯化结果得出:当Zr(SO4)2的质量分数为60%,焙烧温度为400℃时,该超强酸对乙酸丁酯的催化活性最高.     

In Memoriam: Emeritus Professor Henry Oliver Lancaster, AO FAA 1 February 1913 – 2 December 2001

The death, in Sydney, of Oliver Lancaster marks the end of an era in the histories of the Statistical Society of Australia, which (in its previous existence as the Statistical Society of New South Wales) he helped found in 1947, and of the Australian Journal of Statistics of which he was founding editor (1959–1971). Oliver Lancaster was Foundation Professor of Mathematical Statistics at the University of Sydney (1959–1978), where he spent his life as student and academic. During his academic career, he achieved scholarly distinction in at least four fields: mathematical statistics, medical and public health statistics, the history of medicine and of statistics, and statistical bibliography. With E.J.G. Pitman (1897–1993), M.H. Belz (1897–1975), E.A. Cornish (1909–1973) and P.A.P. Moran (1917–1988) he was part of a cohort of renowned Australian mathematical statisticians who laid the foundation of the glory days of Australian mathematical statistics. This obituary and tribute focuses on some of these aspects, within a broader historical picture.     

《一块牛排》的人物刻画张力

文章着重分析了《一块牛排》在四个层次上展现出来的文本张力 :白描和阐述之间的静态描写、对话和行动之间的动态描写、情节冲突的张力和象征等。张力性的人物塑造体现出了主人公广阔的精神宽度和丰富的精神内涵 ,颂扬了失意英雄汤姆·金在绝境中的求生意志和生命的弹性。     

间歇开放系统的可靠性分析与数值计算

研究了一种新型的可靠性系统，即间歇开放系统。在建立数学模型的基础上，我们详细分析了系统有关的可靠性问题，不仅获得时刻ｔ系统失效的概率和（０，ｔ］中系统失效的平均次数的瞬态解，而且也获得其平稳结果。最后用数值计算比较了间歇开放系统和经典系统的差别。     

双核铜(Ⅱ)与N,N,N′,N′-四〔2-(2-吡啶基)乙基〕(o,m,p)苯二甲酰胺配合物的合成与表征

通过酰氯与胺的作用合成了配体Ｎ,Ｎ,Ｎ′,Ｎ′－四〔２－（２－吡啶基）乙基〕（ｏ,ｍ,ｐ）苯二甲酰胺．该配体和铜（Ⅱ）配合,合成了三种新配合物,并以红外光谱、电子光谱、摩尔电导率、元素分析及核磁共振谱进行了表征．     

传统幼儿游戏在农村幼儿数学教育活动中的应用与价值

游戏是幼儿的天性,是幼儿成长发展的需要。幼儿园教育要以游戏为基本活动,寓教育于幼儿的生活、游戏活动中。农村有得天独厚的自然条件,有丰厚的传统幼儿游戏资源,将这些传统游戏应用于幼儿数学教育活动,达成幼儿数学认知目标,是将幼儿数学教育寓幼儿游戏活动路径的有益探索,在农村幼儿园现有条件下有重要的实践意义和理论价值。     

数学建模中的角色转换探讨

针对数学建模中模型建立与求解以及模型的评价与推广这两个关键环节,提出了“旁观者”与“当局者”两个角色,并指出优秀数学建模参与者应该具备“从旁观者到当局者”以及“从当局者再回到旁观者”的双向角色转换能力。同时,还从形式和内容两个方面对数学建模优秀论文的共性进行了分析,并联系数学建模的两个环节,指出了优秀论文和数学建模过程中两个环节这两者与角色转换的紧密关系。最后,对如何培训学生成为一个优秀的数学建模参与者提供了一些参考和建议。     

Bi-objective multi-resource scheduling problem for emergency relief operations

Abstract

Resource scheduling for emergency relief operations is complex as it has many constraints. However, an effective allocation and sequencing of resources are crucial for the minimization of the completion times in emergency relief operations. Despite the importance of such decisions, only a few mathematical models of emergency relief operations have been studied. This article presents a bi-objective mixed integer programming (MIP) that helps to minimize both the total weighted time of completion of the demand points and the makespan of the total emergency relief operation. A two-phase method is developed to solve the bi-objective MIP problem. Additionally, a case study of hospital network in the Melbourne metropolitan area is used to evaluate the model. The results indicate that the model can successfully support the decisions required in the optimal resource scheduling of emergency relief operations.