论资源意识下体育参与对青少年的 积极发展效用

体育运动作为青少年广泛参与的一种活动形式,对积极青少年发展的促进作用受到研究者的广泛认同,然而,体育参与在青少年发展中的消极作用却也不容忽视。作为积极青少年发展研究的一个重要取向和领域,人类积极发展的资源模型提出发展资源的累积可以帮助实现积极青少年发展。因此,在体育参与情境中通过外部资源的创设与内部资源的培育实现青少年发展资源的累积,是体育参与促进青少年积极发展的必由之路。     

论苗族歌鼟的艺术美

苗族歌鼟是湖南湘西南部靖州苗族侗族自治县锹里一带流传的多声部民歌,其旋律优美,声部和谐,唱腔独特,具有自然朴实的民族特色,给人以美的享受。这种艺术美渗透于苗族歌鼟的各个构成元素,非常注重旋律、节奏、和声、调式的美感;歌词体现出苗民们的内在美;唱腔充分发挥出演唱的声韵美;语言更是彰显了民族之本色。这些艺术美的元素综合在一起,使苗族歌鼟成为一种美的化身。     

田园城市建设中成都市公共体育服务体系构建与运行机制研究

公共体育服务作为基本公共服务的重要内容,在构建公共服务体系中占有举足轻重的地位.运用实地考察、制度分析、理论建构等研究方法,对成都市在建设现代田园城市进程中的公共体育服务现状进行调研.研究发现,建设公共体育服务体系是现代田园城市发展的重要内容,现实运行中存在公共体育服务法规文本不完善、体育供给有限、体育组织不健全、体育需求多元化得不到满足等现实问题.研究表明,影响成都公共体育服务的主要因素在于:专业性与专门性的公共体育服务法规文本出台跟进不力;体育供给与需求匹配不足;政府与体育社团组织功能双向发挥不到位.研究建议:明确政府公共体育服务职责;激活社会体育组织参与公共体育服务职能;建立完善的公共体育财政保障机制;构建多元化公共体育服务供给机制.     

Subgroup Analysis with Time‐to‐Event Data Under a Logistic‐Cox Mixture Model

Subgroup detection has received increasing attention recently in different fields such as clinical trials, public management and market segmentation analysis. In these fields, people often face time‐to‐event data, which are commonly subject to right censoring. This paper proposes a semiparametric Logistic‐Cox mixture model for subgroup analysis when the interested outcome is event time with right censoring. The proposed method mainly consists of a likelihood ratio‐based testing procedure for testing the existence of subgroups. The expectation–maximization iteration is applied to improve the testing power, and a model‐based bootstrap approach is developed to implement the testing procedure. When there exist subgroups, one can also use the proposed model to estimate the subgroup effect and construct predictive scores for the subgroup membership. The large sample properties of the proposed method are studied. The finite sample performance of the proposed method is assessed by simulation studies. A real data example is also provided for illustration.     

Understanding Estimators of Treatment Effects in Regression Discontinuity Designs

In this paper, we propose two new estimators of treatment effects in regression discontinuity designs. These estimators can aid understanding of the existing estimators such as the local polynomial estimator and the partially linear estimator. The first estimator is the partially polynomial estimator which extends the partially linear estimator by further incorporating derivative differences of the conditional mean of the outcome on the two sides of the discontinuity point. This estimator is related to the local polynomial estimator by a relocalization effect. Unlike the partially linear estimator, this estimator can achieve the optimal rate of convergence even under broader regularity conditions. The second estimator is an instrumental variable estimator in the fuzzy design. This estimator will reduce to the local polynomial estimator if higher order endogeneities are neglected. We study the asymptotic properties of these two estimators and conduct simulation studies to confirm the theoretical analysis.     

Computing the log concave NPMLE for interval censored data

In analyzing interval censored data, a non-parametric estimator is often desired due to difficulties in assessing model fits. Because of this, the non-parametric maximum likelihood estimator (NPMLE) is often the default estimator. However, the estimates for values of interest of the survival function, such as the quantiles, have very large standard errors due to the jagged form of the estimator. By forcing the estimator to be constrained to the class of log concave functions, the estimator is ensured to have a smooth survival estimate which has much better operating characteristics than the unconstrained NPMLE, without needing to specify a parametric family or smoothing parameter. In this paper, we first prove that the likelihood can be maximized under a finite set of parameters under mild conditions, although the log likelihood function is not strictly concave. We then present an efficient algorithm for computing a local maximum of the likelihood function. Using our fast new algorithm, we present evidence from simulated current status data suggesting that the rate of convergence of the log-concave estimator is faster (between \(n^{2/5}\) and \(n^{1/2}\)) than the unconstrained NPMLE (between \(n^{1/3}\) and \(n^{1/2}\)).     

行业协会对行政权力制约的缺乏及对策

任何公权力都需要监督和制约,行政权力尤为如此.行业协会不同于一般的社会组织,它的出现是对传统国家管理的修正,是社会发展的必然,是对行政权力进行制约的有效武器.但是,我国行业协会的发展却不尽如人意.文章从我国行业协会的历史和现状两方面分析了我国目前行业协会对行政权力缺乏制约的原因,并提出了相关解决的对策.     

大学生“郁闷”心态的成因及克服对策

"郁闷"心态是折射大学生心理的一面镜子。对大学生郁闷心态的意义表征、形成原因及克服对策进行全方位、多角度的理性分析,有利于大学生生活世界的构建和身心的健康发展。     

试论芭蕉的俳谐之旅与风雅之道

在日本文学史上"风雅"一般指全体艺术,而贯穿在松尾芭蕉艺术之道的"风雅"为俳谐之意.松尾芭蕉把乾坤之变视为风雅之因,在天地自然变化之中一味追求新的俳风,直逼以"诚"为本的风雅之道.当时松尾芭蕉接受中国文化时的审美心理的调整过程,以及创造新质的选择机制,从他的旅行记中得到了阐释.