Schackenberg模型差速流动引起的化学不稳定

在Schnackenberg模型中,考虑主要反应物存在差速流动,建立了反应-流动-扩散方程,理论分析了出现差速流动不稳定(DIFI)的条件,得到出现不稳定时流速临界值φc,求得扰动波包的速度vg的表达式,并计算了扰动增长率Reλ1.     

基于毛细不稳定性的聚焦通道微液滴操控研究

针对目前利用微流道产生微液滴时,存在的制作成本高、难于控制液滴大小的缺点,采用数值模拟的方法对聚焦通道进行研究。文章基于毛细不稳定性来系统研究聚焦流道液滴生成与作用规律。研究中主要采用水平集方法,探讨了连续相速度、表面张力、两相黏度比、通道尺寸等因素对于液滴生成的影响,并从不稳定性角度来阐释其物理机制。研究结果表明水平集方法可以很好地模拟液滴破碎,发现连续相速度、表面张力、两相黏度比对液滴尺寸影响较大     

Biological Underpinnings of Borderline Personality Disorder

SUMMARY

Biological understanding of a personality disorder is best achieved by examining the disorder's component dimensions, which for borderline personality disorder include impulsive aggression and affective instability. Current biological research into BPD aims to identify the neurotransmitters and brain regions implicated in each of these key domains. Because of advancing technologies and analytic strategies, structural and functional neuroimaging are at the forefront of such efforts. Structural neuroimaging, primarily in the form of magnetic resonance imaging (MRI) scans, gives information about the anatomy of the brain, while functional neuroimaging, primarily functional MRI (fMRI) and positron emission tomography (PET) scans, gives information about brain activity and neurotransmitter systems at the molecular level. BPD neuroimaging studies to date have implied the involvement of several neurotransmitter systems, principally serotonin, along with dysfunction of select brain regions, including the prefrontal cortex and amygdala, suggesting a “dualbrain pathology”: “hyperarousal-dyscontrol syndrome.” However, the exact mechanisms of all these putative etiologies remain unknown.     

Stable Postdivorce Family Structures During Late Adolescence and Socioeconomic Consequences in Adulthood

Using four waves of panel data from 6,954 American young adults in the National Education Longitudinal Study, we compare the long‐term socioeconomic consequences of growing up in two types of divorced families. Our findings show that the negative socioeconomic consequences of growing up in unstable postdivorce families are at least twice as large as those of staying in a stabilized postdivorce family environment through late adolescence. The study also finds that variations in parental resources during late adolescence partially explain the divorce effects on most attainment indicators. Further, parental divorce appears to affect the socioeconomic attainment of male and female offspring alike. Overall, the study underlines the importance of including postdivorce family dynamics in studying the effect of parental divorce.     

认知环境不稳定性对合资企业成员机会主义认知影响的实证研究

以在中国市场中进行经营的中外合资企业为研究对象,在认知层面上进行了环境因素与机会主义间关系的相关研究,同时引入认知非对称性因素,试图勾勒出合资双方环境认知与机会主义认知间特定的作用路径.研究结果证实了在认知环境不稳定性与合资企业机会主义倾向间关系路径的存在,也证实了认知非对称性因素的影响,同时一定程度上反映出了企业相关认知与客观状况之间的差异会导致不同的结论,还揭示了部分先前研究无法解释的现象,并结合中国市场与中外合资企业这一特定背景的特性做出相应解释.     

Structural change tests for GEL criteria

This article examines structural change tests based on generalized empirical likelihood methods in the time series context, allowing for dependent data. Standard structural change tests for the Generalized method of moments (GMM) are adapted to the generalized empirical likelihood (GEL) context. We show that when moment conditions are properly smoothed, these test statistics converge to the same asymptotic distribution as in the GMM, in cases with known and unknown breakpoints. New test statistics specific to GEL methods, and that are robust to weak identification, are also introduced. A simulation study examines the small sample properties of the tests and reveals that GEL-based robust tests performed well, both in terms of the presence and location of a structural change and in terms of the nature of identification.     

语言接触与语音的不稳定性——蹬上苗语音位变体个案分析

龙山蹬上苗语与当地汉语密切接触,其内部结构受到汉语的强烈影响。目前龙山蹬上苗语正处于向汉语转型过程,出现许多新特点,其中语音的不稳定性很突出,本文主要描写和解释这些语音不稳定现象。     

Cohabitation and Children's Family Instability

This study estimates how much children's family instability is missed when we do not count transitions into and out of cohabitation, and examines early life course trajectories of children to see whether children who experience maternal cohabitation face more family instability than children who do not. Using data from the 1995 National Survey of Family Growth, analyses show that adding transitions into and out of cohabitation to those into and out of marriage increases our measure of family instability by about 30% for White children (N = 1575) and over 100% for Black children (N = 774). We conclude that future research on the impact of children's family composition while growing up should take into account transitions into and out of cohabitation.     

矛盾·对立·冲突—解读《黑暗的心》进程中不稳定性的叙事特色

运用詹姆斯·费伦的修辞叙事理论，从3个方面对约瑟夫·康拉德的《黑暗的心》叙事进程得以建立的基本因素之一“进程中的不稳定性”的叙事特色进行解读，为从一种新的视角去欣赏该作品提供基础。     

Effects of Placement Changes on Health Insurance Stability Among a National Sample of Children in the Child Welfare System

ABSTRACT

Children in the child welfare system have entitlements to health insurance coverage—critical because of their considerable physical and mental health needs—based largely on their placement status. This study conducted path and transitions analyses on data from the National Survey of Child and Adolescent Well-Being (3,801 children followed-up for 3 years) to examine the interplay between placement changes and insurance stability. Children maintained in-home at Wave 1 had significantly lower odds of being insured (OR = 0.7); children transitioning from out-of-home placement to in-home care had significantly lower odds of maintaining insurance coverage (OR = 0.6). Child welfare workers working with children maintained in-home and those being reunified should safeguard the children's insurance status. Policy makers should consider extension of categorical eligibility to all children presenting to child welfare agencies in order to assure access to needed services for these vulnerable children.