Measurement Invariance Across Groups in Latent Growth Modeling     

Eun Sook Kim  Victor L. Willson 《Structural equation modeling》2013,20(3):408-424

This Monte Carlo study investigated the impacts of measurement noninvariance across groups on major parameter estimates in latent growth modeling when researchers test group differences in initial status and latent growth. The average initial status and latent growth and the group effects on initial status and latent growth were investigated in terms of Type I error and bias. The location and magnitude of noninvariance across groups was related to the location and magnitude of bias and Type I error in the parameter estimates. That is, noninvariance in factor loadings and intercepts was associated with the Type I error inflation and bias in the parameter estimates of the slope factor (or latent growth) and the intercept factor (or initial status), respectively. As noninvariance became large, the degree of Type I error and bias also increased. On the other hand, a correctly specified second-order latent growth model yielded unbiased parameter estimates and correct statistical inferences. Other findings and implications on future studies were discussed.  相似文献   

SOCIAL SCIENCE RESEARCH RELEVANT TO AMERICAN JEWISH EDUCATION     

Victor D. Sanua 《Journal of Jewish Education》2013,79(4):238-256

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On rectangular systems of differential equations and their application to circuit theory     

Victor Lovass-Nagy  David L. Powers 《Journal of The Franklin Institute》1975,299(6):399-407

A system of differential equations A(d/dt) x = Bx+f, along with the initial condition x(0) = k, is considered where A and B are m x n matrices. Generalized inverses of the matrix A are used to derive algebraic conditions for the existence and uniqueness of a solution. An example is presented to illustrate application of the results to circuit theory.  相似文献   

Use before know-how: teaching with technology in a Mexican public school     

Judy Kalman  Victor Rendón 《International journal of qualitative studies in education》2014,27(8):974-991

In recent years, the Secretariat of Public Education in Mexico has supplied a significant number of schools with computers and connectivity, putting important resources into the purchase and installation of equipment. It is assumed that teachers will somehow naturally transition to using these tools and in fact, new curricular guidelines derived from international policy put them under a great deal of pressure to do so. This paper presents an up-close, qualitative look at one teacher’s efforts for incorporating technology into her history class and her process of constructing a working knowledge of using the computer, searching for ideas and materials on the Internet, and creating activities for her students. Equally important for incorporating technology into her teaching were the institutional and technical obstacles such as obsolete technology, insufficient connectivity, and school site constraints she confronted. Her case illustrates the complexity of using computer and Internet technologies in classroom settings.  相似文献   

Estimation of Ischemia Modified Albumin (IMA) Levels in Patients with Acute Coronary Syndrome     

Prema Gurumurthy  Sai Krishna Borra  Rama Krishna Reddy Yeruva  Dolice Victor  Sai Babu  K. M. Cherian 《Indian journal of clinical biochemistry : IJCB》2014,29(3):367-371

Myocardial ischemia produces free radicals that catalyze a series of oxidative reactions that damage healthy tissues. The N-terminal sequence of albumin is one of the proteins modified by these highly reactive oxygen species and forms the ischemia modified albumin (IMA). This study involves investigations undertaken in different study groups to assess the levels of IMA. Mean serum IMA levels (U/mL) in patients with ST-segment elevated myocardial infarction (92.1 ± 10.6), non-ST-segment elevated myocardial infarction (87.3 ± 5.95) and unstable angina (UA) (88.9 ± 6.16) were significantly higher than non-cardiac chest pain (77.9 ± 6.69) and also healthy subjects (54.7 ± 17.2) (p < 0.001). IMA is a highly sensitive marker and has a high predictive value, which might prove the usefulness of this biomarker for early detection of myocardial ischemia. These data indicate a possible role of the IMA test in the early triage of patients with chest pain.  相似文献   

Children-Adult Comparisons of VO2 and HR Kinetics during Submaximum Exercise     

Stanley P. Sady  Victor L. Katch  John F. Villanacci  Thomas B. Gilliam 《Research quarterly for exercise and sport》2013,84(1):55-59

Abstract

Oxygen uptake (VO₂) and heart rate (HR) kinetics for submaximum exercise were compared in prepubescent boys (mean age ± SD = 10.2 ± 1.28 years, N = 21) and adult men (30.0 ± 5.64 years, N = 21). Standard open circuit spirometric techniques were used to determine _VO2 and a bipolar ECG was used to measure HR. The kinetics of VO₂ and HR were determined for each subject using graphic procedures. Subjects performed submaximum exercise on the bicycle ergometer at an intensity of 42 ± 1.3% (mean ± SE) of VO₂ max for the children and 39 ± 0.7% of VO₂ max for the adults (p = .07). There were no group differences in VO₂ t1/2 (children t1/2 = 18.5 ± 0.75 secs and adults t1/2 = 17.4 ± 0.39 secs, p = .18) and HR t1/2 (children t1/2 = 11.4 ± 1.86 secs and adults t1/2 = 13.6 ± 1.66 secs, p = .38). These data suggest that children and adults do not differ in cardiorespiratory adjustments during low intensity exercise. This is in contrast to suggestions of other investigators that children have a faster cardiovascular adjustment to exercise.  相似文献   

The Asian Games and Diplomacy in Asia: Korea–China–Russia     

Victor Cha 《国际体育史杂志》2013,30(10):1176-1187

In this article, I will look at the impact of sport on relations between states. In particular, I will study the role that sport has played in enhancing (or damaging) diplomacy in international relations. I will look especially at the role that the Olympics and the Asian Olympics have played in promoting diplomatic breakthroughs between countries. My cases focus on the use of sports diplomacy to foster the end of the Cold War in Asia, studying the breakthroughs between Korea, China and Russia. I will then look at the Beijing Games of 2008 and Guangzhou Asian Games of 2010.  相似文献   

Russian Orthodox culture or Russian Orthodox teaching? Reflections on the textbooks in religious education in contemporary Russia     

Victor A. Shnirelman 《British Journal of Religious Education》2012,34(3):263-279

A new textbook in religious education is analysed, first, in comparison to earlier ones, and, second, with respect to its content and goals. The aim of the Russian Orthodox Church (ROC) is threefold – to educate into religion, to foster the ethnic Russian identity and to make youngsters loyal to the state. Actually, the state rather than society is one of the major values (together with the faith) both for the ROC and for the respective textbooks. The new religious courses received the support of the Russian President in 2009, after which a new educational standard was elaborated and new textbooks were completed. Six courses were accepted: four on ‘traditional religions’, one as an introduction to world religions and one on secular ethics. Each of these six courses could be chosen voluntarily by pupils and their parents. The new courses were first introduced in 24 regions in the spring semester of 2010 as a pilot project. I will analyse the textbooks and show which particular courses were most popular in various regions of Russia.  相似文献   

Communication’s forgotten narratives: the lost history of Charles Siepmann and critical policy research     

Victor Pickard 《Critical Studies in Media Communication》2016,33(4):337-351

The field of communication has much to recover from its intellectual history, particularly critical traditions that have been pushed to the margins. Such a project is inherently political: how scholars narrate the histories of their fields reflect tacit assumptions about discursive boundaries and what counts for legitimate scholarship. Prominent historical narratives typically emphasize certain sub-fields and research traditions while giving short shrift to others. Suggesting larger erasures and deeper tensions in the history of the field, this article aims to recover one such neglected thread, embodied by a reformist policy scholar who is all but forgotten in communication research: Charles Siepmann.  相似文献   

Managing Architectural Records in the House that Rubber Built: A Case Study in Multi-Disciplinary Collaboration in Museum Archives     

S. Victor Fleischer 《Journal Of Archival Organization》2016,13(1-2):47-61

Managing architectural records presents a number of challenges, especially in museums and historic sites where a number of disciplines tend to converge. This case study will chronicle the architectural drawings project at Stan Hywet Hall & Gardens in Akron, Ohio that occurred in two phases over a fifteen-year period. It will present the situations that arose and the multi-disciplinary approaches devised to solve them. It also will illustrate how collaboration across several inherently different yet related professions—including archivists, objects curators, and restoration architects—produced the best outcome and how others can apply these methods to address similar projects.  相似文献