The Centrality of Context in Learning from Further Class Size Research     

Joshua Michael Englehart 《Educational Psychology Review》2007,19(4):455-467

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有限长金属纳米碳管的量子尺寸效应     

蒋杰 《南京晓庄学院学报》2001,17(4):29-33

利用碳管的螺旋、旋转对称性,并沿螺旋方向附加一周期性边界条件,研究了有限长金属纳米碳管的量子化能级及电子波函数.发现,由于长度的限制导致一有限大小能隙的出现,能隙的大小随管的长度振荡并衰减.沿螺旋或管轴方向,费米面附近的波函数呈周期性振荡或常数形式,沿两方向的振荡周期具有不同的表达式.  相似文献   

Revisiting the Model Size Effect in Structural Equation Modeling     

Dexin Shi  Robert A. Terry 《Structural equation modeling》2018,25(1):21-40

Fitting a large structural equation modeling (SEM) model with moderate to small sample sizes results in an inflated Type I error rate for the likelihood ratio test statistic under the chi-square reference distribution, known as the model size effect. In this article, we show that the number of observed variables (p) and the number of free parameters (q) have unique effects on the Type I error rate of the likelihood ratio test statistic. In addition, the effects of p and q cannot be fully explained using degrees of freedom (df). We also evaluated the performance of 4 correctional methods for the model size effect, including Bartlett’s (1950), Swain’s (1975), and Yuan’s (2005) corrected statistics, and Yuan, Tian, and Yanagihara’s (2015) empirically corrected statistic. We found that Yuan et al.’s (2015) empirically corrected statistic generally yields the best performance in controlling the Type I error rate when fitting large SEM models.  相似文献   

固始鸡肌纤维生长发育规律研究     

王立克  金光明  胡亚民 《安徽科技学院学报》2001,(4)

选择 2 0 0只固始鸡饲养在相同的环境条件下 ,分别于 0、2、4、6周龄各随机抽取 10只宰杀 ,对小腿肌 (腓肠机 )、大腿肌 (股胫外肌 )、胸肌 (肋提肌 )、翼肌 (臂二头肌 )肌纤维直径变化规律进行了研究 ,结果表明 :随着日龄的增加 ,不同部位纤维的直径均显著增加 (P <0 0 1) ;不同部位肌纤维直径在不同时期发育速度不同 ;肉质的改变与肌纤维的发育有关。  相似文献   

欠发达地区小城镇建设存在的问题及其对策   总被引：2，自引：0，他引：2  

宗白丽 《安庆师范学院学报(社会科学版)》2002,21(5):20-23

欠发达地区在小城镇建设中,面临着资金短缺、规划管理滞后、认识不到位等问题.加快欠发达地区的小城镇的建设,应加强政府的领导和组织作用,要废除现行的"以乡建镇"模式,搞好小城镇的规划,大力发展小城镇的经济.  相似文献   

三角形顶边线的大小与边的大小间的关系     

李超 《湘南学院学报》2001,22(2):17-22

本文给出了三角形两边上具有某同一特性的顶边线的大小与所在边的大小之间的相互制约关系 .  相似文献   

New Effect Size Measures for Structural Equation Modeling     

Brenna Gomer  Ge Jiang  Ke-Hai Yuan 《Structural equation modeling》2019,26(3):371-389

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电-机械延迟的研究现状和趋势     

吴献中  马春莲 《河西学院学报》2007,23(5):85-87

参考国内外的相关文献,阐述电-机械延迟与肌纤维类型、运动疲劳、年龄性别、遗传及环境、肌肉本身状态等关系的研究现状和未来研究趋势.探讨把电—机械延迟运用到实践中,评定运动能力和作为早期运动选材的可靠指标.  相似文献   

石门台山顶矮林的静态生命表及存活曲线     

尹爱国  刘宏辉  占卫国 《茂名学院学报》2004,14(3):23-26

根据山顶矮林各优势种的大小结构图、静态生命表及存活曲线，并对存活曲线进行线性回归，红锥属于稳定的种群，疏齿木荷、五列木、密花树扣木荷的存活曲线仍代表增长型种群，并且都属于基部宽而顶部窄的金字塔结构，中间也没有缺失现象。  相似文献   

Accounting for the Relationship Between Initial Status and Growth in Regression Models     

Sean Kelly  Feifei Ye 《Journal of Experimental Education》2017,85(3):353-375

Educational analysts studying achievement and other educational outcomes frequently encounter an association between initial status and growth, which has important implications for the analysis of covariate effects, including group differences in growth. As explicated by Allison (1990 Allison, P. D. (1990). Change scores as dependent variables in regression analyses. Sociological Methodology, 20, 93–114.[Crossref] , [Google Scholar]), where only two time points of data are available, identifying a preferred model can be difficult or impossible. In this paper we extend Allison's inquiry by considering multiple sources of the association between initial status and growth simultaneously, including measurement error but also intrinsic associations between initial status and growth. We illustrate the potential trade-offs between the change-score model specifications (models without a control for initial status) and regressor-variable specifications (with a control for initial status) using simulated data.  相似文献