排序方式： 共有17条查询结果，搜索用时 171 毫秒
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尹华东 《内蒙古师范大学学报(教育科学版)》2001,14(6):61-63
一名合格的教师 ,其专业知识无疑非常重要 ,但课堂的教学质量往往还取决于教师对与教学有关的其他相关领域的知识 (如教育心理学 )的了解及重视程度。在日益注重学科之间综合性、关联性的 2 1世纪 ,运用教育心理学的理论来加强对课堂教学效果的研究 ,不仅是教育心理学家们的任务 ,也是每一个教师应积极探索的课题。通过英语口语课的实验、研究 ,证明 :教师在教学中把握好学生的心理特征 ,对提高教学质量至关重要 相似文献
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INTRODUCTION When the flexural load-carrying capacities of existing R. C. or P. C. structures are not sufficient for the service loads, structural strengthening becomes necessary. Using steel plates to strengthen concrete members is a traditional method (Raithby, 1980) and is still an important and popular way at the present time. Fiber-reinforced polymer (FRP) sheets and plates have been used recently as an alternative to steel plates for strengthening concrete structures be-cause th… 相似文献
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Yuying Tsong Jennifer T. Young Jane Duong Killer Mary Ann Takemoto Brad Compliment 《Journal of College Student Psychotherapy》2019,33(2):131-144
With the high prevalence of college students experiencing psychological distress, it is becoming increasingly important to provide prevention and early intervention programs in addition to traditional psychological counseling services. This study examined the effectiveness of a suicide prevention program led by peer educators/trainers on a diverse college campus. Twenty-five suicide prevention workshops were conducted with 479 attendees. Preworkshop and postworkshop assessments revealed significant improvements in participants’ knowledge of suicide and resources. Recommendations for campus-wide suicide prevention efforts using diverse peer educators that reflect the students’ demographic and cultural background, recruitment strategies, and utilization of outreach programming in suicide prevention. 相似文献
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Strengthening reinforced concrete beams using prestressed glass fiber-reinforced polymer-Part Ⅰ: Experimental study 总被引：2，自引：0，他引：2
This work is aimed at studying the strengthening of reinforced concrete (R. C.) beams using prestressed glass fiber-reinforced polymer (PGFRP). Carbon fiber-reinforced polymer (CFRP) has recently become popular for use as repair or rehabilitation material for deteriorated R. C. structures, but because CFRP material is very stiff, the difference in CFRP sheet and concrete material properties is not favorable for transferring the prestress from CFRP sheets to R. C. members. Glass fiber-reinforced polymer (GFRP) sheets with Modulus of Elasticity quite close to that of concrete was chosen in this study. The load-carrying capacities (ultimate loads) and the deflections of strengthened R. C. beams using GFRP and PGFRP sheets were tested and compared. T- and ⊥-shaped beams were used as the under-strengthened and over-strengthened beams. The GFRP sheets were prestressed to one-half their tensile capacities before being bonded to the T- and l-shaped R. C. beams. The prestressed tension in the PGFRP sheets caused cambers in the R. C. beams without cracks on the tensile faces. The PGFRP sheets also enhanced the load-carrying capacity. The test results indicated that T-shaped beams with GFRP sheets increased in load-carrying capacity by 55% while the same beams with PGFRP sheets could increase load-carrying capacity by 100%. The ⊥-shaped beams with GFRP sheets could increase load-carrying capacity by 97% while the same beams with PGFRP sheets could increase the loading-carrying capacity by 117%. Under the same external loads, beams with GFRP sheets underwent larger deflections than beams with PGFRP sheets. While GFRP sheets strengthen R. C. beams, PGFRP sheets decrease the beams' ductility, especially for the over-strengthened beams (⊥-shaped beams). 相似文献
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利用随机扩增多态性DNA(RAPD)技术分析了14种仲彬草属Kengyilia植物的种间关系。对34个OPRON公司十聚体随机引物进行多态性筛选,20个(58．8％)能产生多态性。14个引物产生的112个DNA片断,用于计算种间Jaccard遗传相似性系数分析,在NTSYS程序中利用UPGMA构建系统发育树状图。分析结果表明：(1)14个Kengyilia物种存在较大的遗传多样性;(2)青藏高原的物种与新疆的物种 的RAPD变异极大;(3)形态相似、地理分布一致的物种有一定的亲缘关系,聚类在一起;(4)RAPD结果与形态学和细胞学等分析结果一致。RAPD分析方法将为Kengyilia系统分类提供DNA水平上丰富的资料。 相似文献
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WENDY M. YEN 《Journal of Educational Measurement》1984,21(2):93-111
A procedure is presented for obtaining maximum likelihood trait estimates from number-correct (NC) scores for the three-parameter logistic model. The procedure produces an NC score to trait estimate conversion table, which can be used when the hand scoring of tests is desired or when item response pattern (IP) scoring is unacceptable for other (e.g., political) reasons. Simulated data are produced for four 20-item and four 40-item tests of varying difficulties. These data indicate that the NC scoring procedure produces trait estimates that are tau-equivalent to the IP trait estimates (i.e., they are expected to have the same mean for all groups of examinees), but the NC trait estimates have higher standard errors of measurement than IP trait estimates. Data for six real achievement tests verify that the NC trait estimates are quite similar to the IP trait estimates but have higher empirical standard errors than IP trait estimates, particularly for low-scoring examinees. Analyses in the estimated true score metric confirm the conclusions made in the trait metric. 相似文献
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Strengthening reinforced concrete (R. C.) beams using prestressed glass fiber-reinforced polymer (PGFRP) was studied experimentally as described in Part Ⅰ of this paper (Huang et al., 2005). In that paper, R. C. beams, R. C. beams with GFRP(glass fiber-reinforced polymer) sheets, and R. C. beams with PGFRP sheets were tested in both under-strengthened and over-strengthened cases. The test results showed that the load-carrying capacities (ultimate loads) of the beams with GFRP sheets were greater than those of the beams without polymer sheets. The load-carrying capacities of beams with PGFRP sheets were greater than those of beams with GFRP sheets. The objective of this work is to develop an analytical method to compute all of these load-carrying capacities. This analytical method is independent of the experiments and based only on the traditional R. C.and P. C. (prestressed concrete) theory. The analytical results accorded with the test results. It is suggested that this analytical method be used for analyzing and designing R. C. beams strengthened using GFRP or PGFRP sheets. 相似文献
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WENDY M. YEN 《Journal of Educational Measurement》1986,23(4):299-325
Two methods of constructing equal-interval scales for educational achievement are discussed: Thurstone's absolute scaling method and Item Response Theory (IRT). Alternative criteria for choosing a scale are contrasted. It is argued that clearer criteria are needed for judging the appropriateness and usefulness of alternative scaling procedures, and more information is needed about the qualities of the different scales that are available. In answer to this second need, some examples are presented of how IRT can be used to examine the properties of scales: It is demonstrated that for observed score scales in common use (i.e., any scores that are influenced by measurement error), (a) systematic errors can be introduced when comparing growth at selected percentiles, and (b) normalizing observed scores will not necessarily produce a scale that is linearly related to an underlying normally distributed true trait. 相似文献
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分类学是认识生物体的一种工具,对生物体间系统关系的理解,种质资源利用的指南,也是一种交流用的普通语言。因此,分类处理需要反映这些关系的近期认识。在自然界,生物体只有两个绝对的单位：个体与种。一个种是一群个体被不可缺少的生殖关系相互联系成为的一个绝对单位。生殖隔离是种与种间的基本界限,同时也是生物演化过程中形成独立基因库(gene pools)的惟一因素。既然在种以上的分类群没有绝对界线,在种以上的任一分类处理都不可能避免人为性。虽然如此,仍然必须作出某些分类适应它们的描述、利用与(或)研究。这篇文章对小麦族分类群间生物系统关系的划分是基于遗传学的研究。我们分类处理的原则是：(1)反映这些种系统演化现今的理解;(2)便于种质资源的利用;(3)避免与传统处理有不必要的剧烈改变。 相似文献