Regression analysis of case-cohort studies in the presence of dependent interval censoring

The case-cohort design is widely used as a means of reducing the cost in large cohort studies, especially when the disease rate is low and covariate measurements may be expensive, and has been discussed by many authors. In this paper, we discuss regression analysis of case-cohort studies that produce interval-censored failure time with dependent censoring, a situation for which there does not seem to exist an established approach. For inference, a sieve inverse probability weighting estimation procedure is developed with the use of Bernstein polynomials to approximate the unknown baseline cumulative hazard functions. The proposed estimators are shown to be consistent and the asymptotic normality of the resulting regression parameter estimators is established. A simulation study is conducted to assess the finite sample properties of the proposed approach and indicates that it works well in practical situations. The proposed method is applied to an HIV/AIDS case-cohort study that motivated this investigation.     

Economic Inequality is Associated with Lower Internet Use: A Nationally Representative Study

Social Indicators Research - Previous studies have documented the associations of objective class with either social capital or subjective social status, yet little attention has been paid to the...     

伸展构造背景下倾角资料的构造解释

系统总结了在伸展构造背景下，导致反映构造特征的地层倾角模式复杂化的多种因素。沉积相的不同、岩性变化、井眼状况和测井作业时间等多种因素都可能使地层倾角资料复杂化。进一步指出在拉张盆地中，进行倾角资料的构造解释，必须了解其构造样式的多样性和复杂性，解释存在的多解性。重点解剖了铲式断层在横剖面情况下，对于不同构造位置下的倾角模式。详细分析了一个倾角模式对应多种构造样式的倾角构造解释实例。倾角资料的构造解释应是综合解释，既要综合井筒的相关地质资料，又要综合测井与地质知识，还必须考虑综合地震资料。     

Perimeter-area ratio effects of urbanization intensity on forest characteristics,landscape patterns and their associations in Harbin City,Northeast China

To maximize the ecological services of urban forests, a better understanding of the effects of urbanization on urban forest characteristics, landscape metrics, and their associations is needed for landscape-related regulations in space-limited green infrastructure of metropolitan regions. In this study, Harbin, a typical fast-growing provincial-capital city in Northeast China, is used as a case study. Based on remote sensing images, field surveys, and correlation and variation partitioning analyses, we conclude that landscape characteristics and forest attributes have large variations among different urbanization intensity (UI) regions. Forest patch density (PD), landscape shape index, woody plants species richness, and the Shannon–Wiener index (H′) increased linearly, while stem section area and tree height decreased linearly with the increasing of UIs. UI had a greater influence on tree size and forest community attributes than the forest landscape pattern. Accordingly, any landscape regulation on forest attributes should be implemented according to UIs. In addition, Euclidean nearest neighbor distance(ENN-MN), mean perimeter-area ratio (PARA-MN), fractal dimension index(FRAC-MN), and PD could probably indicate forest attributes the most, e.g., the increase of PARA-MN may be accompanied with taller trees in low and heavy UI regions, but lower woody plants species evenness in low and medium UI regions. More diversified woody plants species, and afforested areas should be advocated in a low UI region, while in a heavy UI region, the conservation of large trees should be implemented. Our results highlight that the implementation of urban forest management should vary according to different urbanization regions to maximize ecological services.

     

A Factor-Adjusted Multiple Testing Procedure With Application to Mutual Fund Selection

In this article, we propose a factor-adjusted multiple testing (FAT) procedure based on factor-adjusted p-values in a linear factor model involving some observable and unobservable factors, for the purpose of selecting skilled funds in empirical finance. The factor-adjusted p-values were obtained after extracting the latent common factors by the principal component method. Under some mild conditions, the false discovery proportion can be consistently estimated even if the idiosyncratic errors are allowed to be weakly correlated across units. Furthermore, by appropriately setting a sequence of threshold values approaching zero, the proposed FAT procedure enjoys model selection consistency. Extensive simulation studies and a real data analysis for selecting skilled funds in the U.S. financial market are presented to illustrate the practical utility of the proposed method. Supplementary materials for this article are available online.     

岩石可钻性能量法现场实验研究

本文介绍了岩石可钻性能全法在油田现场实脸研究的成果:确定其可钻性指标凡对地层的适用范围，证明K指标比其他可钻性指标能更容易、史好地反映出井下实际地层可钻性变化情无，用K指标预浏钻速与实际钻速接近.     

气田低温站污水的处理

本文通过对气田低温站污水调查与分析，经试验确定了对该污水进行“混凝沉降.H₂0_2/Fe^z+氧化”的处理工艺及条件，文章还对彩响处理效果的各种因素进行了讨论.试验表明，该工艺对有机污染较重的气田污水具有良好的处理效果.     

长三角26个城市民生高质量发展测评报告

民生高质量发展作为"六个高质量"的一个方面,既是高质量发展的逻辑起点,也是高质量发展的最终目的.通过对民生高质量发展各指标进行计算加总,最终得出长三角26个城市的民生高质量发展指数及排名.杭州是长三角城市群中民生高质量发展的首位城市,南京紧随其后.苏州、无锡、宁波、常州、绍兴、嘉兴和金华的民生高质量发展水平相对较高,湖州、台州、舟山、镇江、上海的城市民生高质量发展水平位于平均水平之上.     

媒体传播与非传统安全共生关系探析

全球化使越来越多的非传统安全问题成为我们生活中不得不面对的现实语境,媒体传播在非传统安全领域呈现出重要价值及范式。媒体传播与非传统安全问题互为条件,传播推动非传统安全问题不断变化,而非传统安全事态也影响媒体传播的议题设置,非传统安全问题的解决则有赖于媒体传播的导向。由此,研究媒体传播中的主体、内容与技术,媒体传播与非传统安全之间的互融互通关系成为思考媒体传播与非传统安全共生关系的核心内容。     

地方经济增长压力、空气质量与消费者信心

公众对空气质量的关注越来越高,甚至成为评价政府环保工作的一把标尺。空气质量较好的城市,消费者更容易对未来保持乐观,进而提高消费者信心。本研究基于2018-2019年的"中国城市生活质量指数",实证检验空气质量对消费者信心的影响,并从地区经济增长速度和地方政府财政压力两个角度衡量地方经济增长压力,检验地方经济增长压力对空气质量与消费者信心两者关系的作用机理。研究发现:空气质量的恶化会降低消费者信心,即空气质量越差,消费者信心越容易降低。地区经济增长速度和地方政府财政压力都会在一定程度上缓解空气质量恶化对消费者信心的负向影响。因此,地方政府要重视空气质量对消费者信心的作用,切实做好环境保护工作,提高消费者信心,激发市场活力。