弹跳球运动的研究

建立了弹跳球运动的二维映射关系式，利用非线性动力学的原理和方法，在不同控制参数条件下，研究了系统二维映射式不动点的稳定性．     

金色补血草黄色素提取及稳定性研究

对金色补血草黄色素的提取条件和稳定性进行了研究.结果表明;提取的最佳条件是以pH=5.0体积分数70%的乙醇为提取剂,物料比1g:8m L,在60℃下浸提2.5h,色素对光、热稳定性较好,抗氧化性好,在酸性介质中稳定.     

汽车动态稳定控制(DSC)系统

汽车动态稳定控制(DSC)系统在汽车高速转弯将要出现失控时,可有效地增加汽车稳定性来减少事故的发生,本文说明了其工作原理,阐述了其防止转向不足和转向过度的控制方法。     

浅谈影响电视新闻摄像质量的几个关键因素

在确保新闻真实性前提下,个性化行为特征和想象力的发挥、无剪辑拍摄意识的运用以及画面稳定性是影响电视新闻摄像质量的关键因素。     

The Relationship Between Personality Temperament,Communication Reticence,and Fear of Negative Evaluation

This study examined the influence and relationships of the Big Five personality variables of extraversion, agreeableness, conscientiousness, emotional stability (neuroticism), and openness to experience on communication reticence and fear of negative evaluation (FNE). Undergraduates from (N = 336) basic communication or psychology courses completed self-report measures for these variables. Structural equation modeling indicated that only one personality dimension, extraversion, directly predicted reticence, whereas neuroticism was positively related to FNE, and openness was a negatively associated predictor of FNE. The model also showed a strong relationship between FNE and reticence, indicating that FNE moderated the relationship between two of the five personality variables (i.e., openness and neuroticism) and reticence.     

The boundary-spanning role of a cooperative support organization: managing the paradox of stability and change in non-traditional organizations

This project provides an interpretation of how one cooperative support organization, the Nebraska Cooperative Council, discursively functions to help its constituent cooperatives consolidate resources in order to better intersect with organizations in a larger bureaucratic system. In analyzing qualitative data collected through in-depth interviews, surveys, and organizational documents, we found the paradox of stability and change a revealing prism through which to make sense of participants' experiences. We work toward locating and describing how the Council, through its boundary-spanning activities, helps cooperatives manage the paradox of stability and change while protecting their core participatory ideologies. By providing networks of learning, promoting the legitimacy of cooperative forms of organizing, and protecting cooperatives' interests, the Council is an entity helping cooperatives to reconcile their internal requirements for democracy with the external demands of the marketplace.     

Short-term tracking of performance and health-related physical fitness in girls: The Healthy Growth in Cariri Study

Abstract

The main purpose of this study was to track the performance and health-related physical fitness of girls from Brazil's Cariri region. In the “Healthy Growth in Cariri Study”, 294 girls from public and private schools were divided into four age cohorts – 8, 10, 12, and 14 years – and followed for three consecutive years, with an assessment every 6 months. Shuttle run, hand grip, standing long jump, trunk lift, curl-up, 12-min run, and fatness were used to rate physical fitness performance and health-related components on each of six occasions. Tracking was done in a stepwise manner, using auto-correlation, by modelling the individual history of change in performance of each girl, and using Foulkes and Davies’ γ-coefficient. SPSS 18.0 and TIMEPATH were used for data analysis. Auto-correlations evidenced low-to-moderate values in almost all components of performance and health-related physical fitness. Intra-individual tracking analysis showed large variation in all fitness components as a result of a wide spread in individual history of change in fitness performance. Population estimates of γ were low in all tests. Our results show low-to-moderate tracking of physical fitness components of girls. A wide range of intra-individual and inter-variability in fitness development was observed.     

Profiles of school readiness among four-year-old Head Start children

This study uses the Family and Child Experiences Survey (FACES) data from 1997 to investigate the degree to which child, family, classroom, teacher, and Head Start program characteristics are related to children's school readiness and continued development over the four-year-old Head Start year. Latent class analyses were used to examine the constellation of school readiness competencies within individual Head Start children in both the fall and spring of the four-year-old Head Start year. Multinomial regression analyses examined patterns of association between demographic and program characteristics and profile membership over time. Four distinct developmental profiles were found in the sample in the fall, and three were found in the spring. Furthermore, a substantial proportion of Head Start children (43%) moved from a developmental profile including some risk to a strengths profile between the fall and spring of the Head Start year. Child age, family structure, parental educational attainment, classroom quality and teacher's level of educational attainment emerged as important factors associated with stability and change in profile membership over the four-year-old Head Start year, but receipt of social services through Head Start was not associated with stability or change in profile membership.     

Verbal reasoning test scores and their stability over time

As part of an extended study into school assessment practices the use of verbal reasoning tests and their possible contribution to measuring pupil progress is being investigated. One phase of the study has involved testing the stability of individual verbal reasoning scores over time. The findings of this phase are presented here and located within the broader context of intelligence testing. The discussion concludes with a number of questions relating to the use of pupils’ academic achievements as appropriate measures of school success. The ongoing work considers how pupil success could be measured fairly, taking into account individual pupil differences, including both genetic and socio-economic factors. The work being developed has potential for both formative and summative assessment procedures and also as a tool for reporting the achievements of individual pupils and educational establishments. The full work will be published in due course.     

石灰改善土在合六高速公路路基工程中的应用

介绍了在安徽膨胀土地区路基施工中,由于膨胀土存在压实困难、裂隙发育、易风化、吸水膨胀降低强度等缺陷,为解决填料短缺,降低工程造价,提高路基强度和整体稳定性,采用在膨胀土中掺石灰,改善膨胀土的结构,达到提高路基填筑质量的目的。