Adolescent Protective Factors Promoting Resilience in Young Adults at Risk for Depression

In a longitudinal, community-based study, adolescent protective factors for those at risk for depression were identified that were associated with resilient outcomes in young adulthood. For those with childhood risk factors for major depression, significant protective factors included family cohesion, positive self appraisals, and good interpersonal relations. Findings may help inform the development of prevention and treatment programs for adolescents vulnerable to depression. Implications for future research and clinical practice are discussed.     

江泽民关于选拔和培养优秀中青年干部的辩证思想

江泽民同志于 2 0 0 0年 6月在全国党校工作会议上的讲话 ,充满了实事求是的精神和深刻的辩证思维风格 ,体现了鲜明的时代特色。他对新时期干部德才基本要求所作出的新的规定 ,是对马克思主义人才理论的极大丰富。他提出的“重发现同时重培养”的原则、“使用、培养同一论”以及“德才具体说”、“辩证的台阶、资历观”等 ,是对传统的人才理论的突破和对马克思主义人才学说的丰富和发展     

Implementation in generic environments

In this paper, we study implementation in “economic environments”. It is shown that there is a dense subset of the set of preference profiles such that given an arbitrary social choice function, f, and ε>0, there exists another social choice function, f _ε, within ε of f uniformly and implementable in Nash equilibrium on the dense subset.     

用于分散电压控制的规则库法

电力系统正常运行时,无功/电压控制目的是安全经济供电.而在紧急情况下,首要目标是运行的安全性,其次才是经济性.本文提出的局部网概念及其灵敏度矩阵,以及对电压违限严重性的分级和控制战略,使控制更为快速有效.此法更适用于当事故引起全系统运行数据不全时对局部网的电压控制.     

Welfare inequalities and Rawlsian axiomatics

This paper is concerned with ordinal comparisons of welfare inequality and its use in social welfare judgements, especially in the context of Rawls' difference principle. In Section 1 the concept of ordinal inequality comparisons is developed and a theorem on ordinal comparisons of welfare inequality for distributional problems is noted. Section 2 is devoted to Harsanyi's (1955) argument that a concern for reducing welfare inequalities among persons must not enter social welfare judgements. In Section 3 an axiomatic derivation of Rawls' lexicographic maximim rule is presented; this relates closely to results established by Hammond (1975), d'Aspremont and Gevers (1975) and Strasnick (1975). In the last section the axioms used are examined and some alternative axioms are analysed with the aim of a discriminating evaluation of the Rawlsian approach to judgements on social welfare.Based on the text of a lecture delivered at the International Congress of Logic, Methodology and Philosophy of Science in London, Ontario, Canada, on August 29th, 1975. Thanks are due to Peter Hammond and Kevin Roberts for helpful comments and criticisms.     

基于iCARE理论的《大学英语》课程定位研究与教改实践

《大学英语》是高校一门重要的公共基础课,厘清课程性质是推进教学改革的基础。在梳理不同时期《大学英语》教学大纲有关规定,借鉴国外高校现代语言课程定位基础上,提出《大学英语》课程定位是EGP,提高"交互密度"是保证学习效率和效果的关键。河北科技大学在多年教改实践基础上,创建了iCARE教学理论,并从六个方面推进《大学英语》课程改革,形成具有校本特色的《大学英语》教学模式,取得良好教改成效。     

Housing and children: simultaneous decisions?—a cohort study of young adults’ housing and family formation decision

This study contributes to earlier research on homeownership and childbearing by taking into account the potential simultaneity between these two life events. A dataset comprising three different Swedish birth cohorts suggests that these are events that are indeed simultaneous. Different tests indicate that taking this simultaneity into account gives an overall statistically significant improvement of the model fit. However, this result is most obvious for those young adults who faced increasing problems on the housing market. The childbearing decision of these cohorts also seems to be more sensitive to changes in the user cost.     

Accounting for Uncertainty in Heteroscedasticity in Nonlinear Regression

Toxicologists and pharmacologists often describe toxicity of a chemical using parameters of a nonlinear regression model. Thus estimation of parameters of a nonlinear regression model is an important problem. The estimates of the parameters and their uncertainty estimates depend upon the underlying error variance structure in the model. Typically, a priori the researcher would not know if the error variances are homoscedastic (i.e., constant across dose) or if they are heteroscedastic (i.e., the variance is a function of dose). Motivated by this concern, in this paper we introduce an estimation procedure based on preliminary test which selects an appropriate estimation procedure accounting for the underlying error variance structure. Since outliers and influential observations are common in toxicological data, the proposed methodology uses M-estimators. The asymptotic properties of the preliminary test estimator are investigated; in particular its asymptotic covariance matrix is derived. The performance of the proposed estimator is compared with several standard estimators using simulation studies. The proposed methodology is also illustrated using a data set obtained from the National Toxicology Program.     

Lagrange multiplier unit root test in the presence of a break in the innovation variance

We show that the Lagrange multiplier (LM) unit root test exhibits size distortions when a break in the innovation variance exists but is ignored. We develop a modified LM unit root test that is based on a generalized least-squares transformation of the original series. The asymptotic null distribution of the new modified LM unit root test is derived. Finite-sample simulation evidence shows that the modified LM unit root test maintains its size and has reasonable power against the trend stationary alternative.