Statistical Power of the Multiple Domain Latent Growth Model for Detecting Group Differences

The latent growth model (LGM) in structural equation modeling (SEM) may be extended to allow for the modeling of associations among multiple latent growth trajectories, resulting in a multiple domain latent growth model (MDLGM). While the MDLGM is conceived as a more powerful multivariate analysis technique, the examination of its methodological performance is very limited. Hence, the present study compared the power of the MDLGM with that of a set of univariate LGMs for detecting group differences in growth rates over time using a Monte Carlo study with a two-group and two-domain design. The results indicated that there were different scenarios where the power rates for the MDLGM were greater than that of the set of LGMs (and vice versa) due to a joint function of the two domains’ intercorrelation size and the group difference effect size.     

无机多组份体系同时测定分光光度法

自1951年B、chance研制成第一台双波长分光光度计以来,无机多组份体系分光光度测定方法,取得了显著的进展,发展了双波长分光光度法,三波长分光光度法,双显色双波长分光光度法,导数分光光度法,组合导数分光光度法,本文试就借助于仪器的输出信息,消除重叠光谱带的干扰,同时测定无机多组份体系的分光光度方法,作一简要的评述。     

城市社区体育组织结构"小型化"探索

为适应城市居民生活“小区”化和以建设“明小区”为重点的社会工作路线，改变目前社区体育组织以“街道”为单一层次的基本结构，本课题采用献法、调查法、比较及逻辑法等，对“小型化”社区体育组织的现状、目标及发展模式进行了深入研究，并提出了辐射型、网络型、独立型三种递进式组织结构模式，为社区体育组织结构的转型发展提供参考依据。     

论党在早期工人运动中解决帮会问题的策略

中国共产党成立以后就着手开展工人运动 ,首先遇到的障碍是帮会。由于在工厂、码头、矿山、货栈等有劳苦工人的地方 ,几乎都有帮会的活动 ,又由于帮会在思想上禁锢着工人群众的觉悟 ,在组织上限制着工人群众的自由 ,阻碍工人运动的发展。为此 ,我党制定了一系列妥善处理帮会的策略 ,排除了帮会对工人运动的干扰 ,有力地推动了中国革命。     

‘The sky is the limit’: higher education,gender and empowerment in the Bedouin community in the Negev in Israel

This article addresses the meaning that female Bedouin from the Negev in Israel give to higher education. I shall focus the discussion on the processes in which personal and social contexts merge into one another. Although there has been an increase in the number of investigations of the ways in which Bedouin women in the Negev in Israel participate in the public sphere, a survey of the literature reveals that no investigations have been conducted on the meaning educated women attribute to higher education during the course of their lives. Through an analysis of ten in‐depth interviews carried out between 1998 and 2001, this article examines issues such as gender, empowerment and social mobility amongst young Bedouin women in Israel.     

Large amplitude free vibration of a flexible panel coupled with a leaking cavity

This paper addresses the effect of leakage on the natural frequencies of a large amplitude vibrating panel backed by a cavity, which has not been considered in many other related studies. The structural-acoustic governing equations are employed to study this nonlinear problem. An elliptical integral method, which was recently developed for the nonlinear panel cavity problem, is introduced here to solve for the structural-acoustics responses. The present results agree reasonably well with those obtained from the classical harmonic balance method. Modal convergences of the nonlinear solutions are performed to verify the proposed method. The effects of vibration amplitude and leakage size are studied and discussed. It is found that (1) the edge leakages in a panel cavity system significantly affect the natural frequency properties, and (2) the edge leakages induce a low frequency acoustic resonance.     

Examining Intermediate Omitted Levels in Hierarchical Designs via Latent Variable Modeling

This article outlines an interval estimation procedure that can be used in a 3-level setting to evaluate the proportion of outcome variance attributable to the second level of clustering. The method is useful for examining the necessity of including a possibly omitted intermediate level of nesting in analyses of data from a multilevel study, and represents an informative addendum to current statistical tests of second-level variance. The approach is developed within the framework of latent variable modeling and can be used as an aid in the process of choosing between 2-level and 3-level models in a hierarchical design. The discussed procedure is illustrated with an empirical example.