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卤素动力学光度法研究：利用抑制效应测定痕量溴离子 总被引：2，自引：0，他引：2
刘秀娟 《江西教育学院学报》1997,18(3):34-36,41
基于稀硫酸介质，痕量溴对溴酸钾氧化孔雀绿反应的强抑制作用，建立了动力学光度法测定痕量溴离子的新方法。方法的表观摩尔吸光系数为４．０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，灵敏度为１．９８×１０－１０ｇ／ｍｌ，用于玻璃、镁条和硫酸铵中溴的测定，结果满意 相似文献
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Effects of a prenatal care intervention for adolescent mothers on birth weight, repeat pregnancy, and educational outcomes at one year postpartum 
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下载免费PDF全文 Ford K Weglicki L Kershaw T Schram C Hoyer PJ Jacobson ML 《The Journal of perinatal education》2002,11(1):35-38
About one-third of adolescent mothers receive inadequate prenatal care, and babies born to young mothers are more likely to be of low birth weight. The objective of this study is to evaluate a peer-centered prenatal care program for adolescent mothers. Pregnant adolescents were randomly assigned to an experimental or control group in a mastery modeling peer-support intervention designed to improve long- and short-term perinatal outcomes. A sample of 282 urban pregnant adolescents (94% African American, 4% Caucasian, 2% other) participated in the study. Participants were recruited from five clinics located mainly in Detroit, Michigan. Participants in the experimental group received care in a small group setting and learned to perform critical measurements with a peer partner during prenatal visits. Participants in the control group received individual prenatal care in the same clinics. Outcome measures included birth weight, years of schooling completed at one year postpartum, planned and unplanned pregnancy at one year postpartum, and employment and school attendance at one year postpartum. Mothers in the experimental group had a lower rate of low birth weight (6.6% vs. 12.5%, p=0.08). The rate of unplanned pregnancy was also lower for adolescents in the experimental group (13.4% vs. 15.9%), although this difference was not statistically significant. Adolescents who participated in the intervention were more likely to have continued their education during the pregnancy and the postpartum year. The mastery modeling, peer-centered, prenatal care program produced some positive pregnancy outcomes for adolescent mothers. 相似文献
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Trace Haythorn 《Religious education (Chicago, Ill.)》2013,108(3):331-347
Barriers exist at a variety of levels that either impede or prohibit persons with disabilities from full participation within the worship, education, and mission of congregations. Placing the emerging body of literature on inclusion in congregations in conversation with a case study of one particular congregation, the author examines the sources and strategies of one church’s efforts at becoming more inclusive. The role of the Director of Christian Education, Martha Bess DeWitt, is presented, with the focus on her participation, leadership, and reflection on hospitality as central to the church’s move toward intentional inclusion of people with disabilities. You shall love your neighbor as yourself. -Leviticus 19:18 相似文献
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This study examined three basal reading programs published by Heath (1989), Silver Burdett Ginn (1993) and Houghton Mifflin (1993), to determine how frequently logically necessary relationships are expressed in text used by basal readers, and whether direct instruction in making logically necessary inferences accompanies such expressions in basal reader series. The complete contents of the basal readers, from grades one through eight, and all teachers' instructions pertaining to content read by students, were examined for each series. Frequency counts made by independent raters indicated that readers of these three series have a steady and frequent rate of opportunities to make logically necessary inferences, and to observe such inferences being modeled by the text; no significant differences were found between any of the series in the number of such opportunities. We found that while children's reading materials clearly offer a natural context in which logical understanding may be constructed, instructions for teachers in the basal series we examined did not include directly teaching students to use this kind of reasoning in reading comprehension. Suggestions are offered for how such instruction might be integrated with current teaching strategies in inference-making. 相似文献
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In an attempt to counter the culture of high-stakes testing and the instrumental coverage of poetry, the authors designed and taught a sustained, intensive poetry course to secondary students. In this article they advocate a deep genre study of poetry for students and teachers and highlight important principles from their work that are applicable in a variety of teaching contexts. 相似文献
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Jan L. Plass Catherine Milne Bruce D. Homer Ruth N. Schwartz Elizabeth O. Hayward Trace Jordan Jay Verkuilen Florrie Ng Yan Wang Juan Barrientos 《科学教学研究杂志》2012,49(3):394-419
Are well‐designed computer simulations an effective tool to support student understanding of complex concepts in chemistry when integrated into high school science classrooms? We investigated scaling up the use of a sequence of simulations of kinetic molecular theory and associated topics of diffusion, gas laws, and phase change, which we designed and experimentally tested. In the two effectiveness studies reported, one in a rural and the other in an urban context, chemistry teachers implemented two alternate versions of a curricular unit—an experimental version, incorporating simulations, and a control version, using text‐based materials covering the same content. Participants were 718 high school students (357 rural and 361 urban), in a total of 25 classrooms. The implementation of the simulations was explored using criteria associated with fidelity of implementation (FOI). Each context provided insights into the role of FOI in affecting the effectiveness of the interventions when working with groups of teachers. Results supported the effectiveness of this sequence of simulations as a teaching tool in a classroom context, and confirmed the importance of FOI factors such as adherence and exposure in determining the specific environments in which these materials were most effective. © 2012 Wiley Periodicals, Inc. J Res Sci Teach 49: 394–419, 2012 相似文献
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In this article, we examine the American finding aid as a form of genre from both a cognitive and a sociological perspective and use this analysis to articulate some of the hidden or underlying regularities and assumptions of archives work. As finding aids increasingly are created and delivered digitally, we can anticipate tensions in the form and use of these genres giving rise to increased scrutiny of archival practices that in turn should cause us to explore the representation of the archives profession in a digital world. A particular focus of this article is to advance an argument that for too long, the actual consumption and use, that is, the reading of finding aids, has been ignored or overlooked. Yet, it is likely that only through understanding how people exploit and read these documents in real use can we improve their design. In so doing, we make a case for archival research to move further into the analysis of user behavior, information seeking, and contemporary information practices so as to improve and extend the appreciation of how archives contribute to the larger information field. 相似文献
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Schillinger Frieder L. Mosbacher Jochen A. Brunner Clemens Vogel Stephan E. Grabner Roland H. 《Educational Psychology Review》2021,33(4):1887-1906
Educational Psychology Review - The inverse relationship between test anxiety and test performance is commonly explained by test-anxious students’ tendency to worry about a test and the... 相似文献
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Ciaran B. Trace 《Archival Science》2002,2(1-2):137-159
Traditional premises in archival theory and practice hold that archival records are authentic as to procedure and impartial
as to creation because they are created as a means for, and as a by-product of, action, and not for the sake of posterity.
Such Positivist assumptions about the nature of records have come under sustained scrutiny in the archival literature over
the past decade. The post-Positivist view of records embraces the record as a socially constructed and maintained entity.
This paper situates itself within this new paradigm in an exploration of the beginning of the life of the record. It is therefore
concerned with the creator (or recorder) and the social construction of the record. In expanding beyond a purely administrative-
and juridical-based theory of records, this paper draws upon research from other disciplines, such as sociology, in order
to place records and record keeping within a framework that allows for an understanding of their social nature. In particular,
the goal is to determine the underlying social factors that directly influence and shape the creation and keeping of records
and to begin to understand how these factors manifest themselves in the construction of the record. 相似文献
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