一类二阶中立型时滞差分方程的振动定理

研究了一类具有变系数的二阶中立型时滞差分方程的振动性,得到了该类方程振动及差分算子△振动的一个充分条件.     

二维变系数线性微分系统的求解定理

给出二维变系数线性微分系统在已知某解的情形下求通解的公式,并直接应用此公式,导出几类二维变系数线性微分系统的通解公式.对理论和实际应用都是有益的.     

平面三次微分系统研究综述

本文首先阐明了研究E3的重要意义,然后指出E3的一般性质。奇点的分类与判定极限环线与奇异闭轨的存在性与唯一性,相对位置与代数曲线解．     

“Ox Hunger”: Psychoanalytic Explorations of Bulimia Nervosa

Bulimia, a term derived from Greek words meaning ox and hunger, is a food obsession characterized by repeated overeating binges followed by purges of forced vomiting, prolonged fasting, or abuse of laxatives, enemas, diuretics and amphetamines. It provides temporary relief to emotional pain. If untreated, bulimia causes serious medical and dental problems. In this paper, I first present an overview of the historical development of bulimia nervosa as a clinical entity and then explore the syndrome from a psychoanalytic perspective, focusing on the Freudian drive-conflict model, the pathology of early object relations, and attachment theory. A case is presented and treatment implications are discussed.     

Problem‐ and solution‐focused characteristics of parenting support, 3 years after implementation of the solution‐focused approach: A qualitative content analysis

In recent years, solution‐focused parenting support has been developed and implemented as a promising brief and strength‐based approach. Given the fundamental differences between solution‐focused and the historically more common problem‐focused parenting support and the complexity of transforming professional practice, an actual shift towards solution‐focused parenting support can be expected to be limited up to now. However, because research into the specific communication characteristics of professional parenting support is currently lacking, no conclusion can be drawn at present. Therefore, this study aims to explore the current problem‐ and solution‐focused characteristics of parenting support in the Dutch youth healthcare (YH). In total, 15 support sessions performed by 10 public health nurses were audio recorded and transcribed verbatim. A detailed qualitative content analysis of professional communication was conducted to identify problem‐ and solution‐focused factual, expressive, relational and appealing aspects of parenting support. Problem‐focused characteristics dominated all sessions of parenting support. This study is the first to thoroughly analyse the problem‐focused and solution‐focused communication characteristics of professional parenting support using a qualitative content analysis. Parenting support practice in the Dutch YH did not shift substantially to a solution‐focused approach. More effort is required to stimulate and facilitate this professional transformation.     

Fused least absolute shrinkage and selection operator for credit scoring

Credit scoring can be defined as the set of statistical models and techniques that help financial institutions in their credit decision makings. In this paper, we consider a coarse classification method based on fused least absolute shrinkage and selection operator (LASSO) penalization. By adopting fused LASSO, one can deal continuous as well as discrete variables in a unified framework. For computational efficiency, we develop a penalization path algorithm. Through numerical examples, we compare the performances of fused LASSO and LASSO with dummy variable coding.     

“文人”概念起源考释

"文人"是一个发展性概念,其远源是"士"。在西周到春秋初叶,"文人"指有文德的人。春秋战国之际,"文士"崛起。到东汉时,"文人"等同"文士",指那些有较高文化水平和代表社会道义的知识阶层的成员。     

王夫之《张子正蒙》诠释方法论初探?

与北宋中期以来包括二程、朱熹在内的许多儒家学者的有关看法相比较，王夫之关于《正蒙》的文本观念，是全面的、深刻的，有着一定的独到性、创造性和科学性。正是从这种文本观念出发，王夫之建构起富有创造性的四种诠释方法论：语言诠释方法，体验诠释方法，类推诠释方法，贯通诠释方法。运用这些方法，王夫之务必要在程朱二子之外另辟蹊径，对于张载创立的“真孟子以后所未有也”的哲学理论大力阐发，在新的社会文化条件下予以重建，从而力图推进中国哲学的发展，挽回当世“人心之横流”！     

Allocation of resources in asymmetric competitions: How do the weak maintain a chance of winning?

To maintain a chance of occasionally beating a stronger player in a competition waged over several fields, a weaker player should give up on some of the fields and concentrate resources on the remaining ones. But when do weak players actually do this? And which fields do they give up when the fields differ in their likelihood of being assessed? We report an experimental study of resource allocation in which asymmetric pairs of players compete over asymmetric fields. Symmetric players and symmetric fields are used for control. We find that players behave as follows: (1) Average wins are the same in the symmetric and asymmetric fields conditions and correspond to relative player strength. (2) The proportion of fields given up on decreases with a player’s greater relative strength, increases for asymmetric field likelihoods, and increases when competitions are framed in meaningful context; this proportion is related to wins. (3) When field likelihoods are asymmetric, players’ resource allocation is correlated with likelihood. Wins generally increase with that correlation but the relation is different for players of different strength. (4) The proportion of fields given up on and the correlation with likelihood change with experience towards the values corresponding to higher wins.     

Introductory Statistics Textbooks and the GAISE Recommendations

The six recommendations made by the Guidelines for Assessment and Instruction in Statistics Education (GAISE) committee were first communicated in 2005 and more formally in 2010. In this article, 25 introductory statistics textbooks are examined to assess how well these textbooks have incorporated the three GAISE recommendations most relevant to implementation in textbooks (statistical literacy and thinking; use of real data; stress concepts over procedures). The implementation of another recommendation (using technology) is described but not assessed. In general, most textbooks appear to be adopting the GAISE recommendations reasonably well in both exposition and exercises. The textbooks are particularly adept at using real data, using real data well, and promoting statistical literacy. Textbooks are less adept—but still rated reasonably well, in general—at explaining concepts over procedures and promoting statistical thinking. In contrast, few textbooks have easy-usable glossaries of statistical terms to assist with understanding of statistical language and literacy development. Supplementary materials for this article are available online.