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

Yiu-yin Lee 《浙江大学学报(A卷英文版)》2017,18(1):75-82

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.  相似文献   

Examining Intermediate Omitted Levels in Hierarchical Designs via Latent Variable Modeling     

Tenko Raykov  Thanos Patelis  George A. Marcoulides  Chun-Lung Lee 《Structural equation modeling》2016,23(1):111-115

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.  相似文献   

Young Children’s Curiosity About Physical Differences Associated with Race: Shared Reading to Encourage Conversation     

Kristen M. Kemple  Il Rang Lee  Michelle Harris 《Early Childhood Education Journal》2016,44(2):97-105

Many have called for re-examination of the “colorblind” philosophy to which some early educators have, tacitly or explicitly, adhered (e.g. Boutte et al. 2011; Derman-Sparks and Edwards 2010; Husband 2012). It has been argued that, while colorblind approaches may appear to be politically neutral, they actually exacerbate racial oppression. In this article, we advocate for a direct and active approach to raising conversations about race with younger preschool children. Based on the developmental nature of young children’s concepts of self and of other, our focus is on initiating discussions about concrete and observable physical aspects of human diversity associated with race. Young children notice and are curious about differences in skin color, hair texture, and facial features. Because these differences are salient, are accessible, and are of interest to young children they can serve as an effective starting point. We suggest shared reading of high quality illustrated children’s books, incorporating the principles of dialogic reading, as a potent springboard for discussions about race with very young children. Our purpose is to equip children, very early in their schooling, with a color-filled appreciation for and comfort with physical diversity of appearance. On that foundation, children may better proceed on the course of developing anti-racist attitudes.  相似文献   

凸合作对策经典解的一特殊性质     

王振吉  刘微  李靖  封梅 《唐山师范学院学报》2007,29(5):63-65

将凸合作对策的性质与其经典解核心联系起来,从而得到凸合作对策核心的一特殊性质:即若凸合作对策可以分解成两个凸对策差的形式,则它的核心可以分解成两个凸对策核心的Minkowski差。  相似文献   

敦煌归义军曹氏统治者果为粟特后裔吗——与荣新江、冯培红先生商榷     

李并成  解梅 《家教指南》2006,(6):109-115

荣新江、冯培红先生于《历史研究》2001年1期同时刊出大作,均认为归义军曹氏统治者为粟特后裔.这一结论有商榷的必要.考之史籍早在秦汉之际中原曹姓就已入居敦煌,其子孙又在河西一带枝叶分布.据《曹通神道碑》等,唐初谯郡曹通家族又因官居于瓜州,且屡立军功,荫及子孙,遂成为瓜沙颇为显赫的大族.归义军节度使曹议金很可能为其族属.此外从归义军曹氏之婚姻关系、曹氏统治时期粟特后裔的地位及其影响等分析,都无法证明曹氏为粟特后裔.莫高窟一些洞窟中绘有曹议金的大幅供养画像和题记,画面上曹议金丝毫没有胡人相貌特征,完全为汉族面貌.  相似文献   

神奇的26个字母     

东梅 《物理教学探讨》2003,21(3):5-5

26个英文字母在中学物理中扮演着重要角色,许多物理知识就凝缩在这小小的字母里面,你知道这些字母通常所表示的物理含义吗?  相似文献   

Instructing adolescents with learning disabilities: converting a meta-analysis to practice     

Swanson HL  Deshler D 《Journal of learning disabilities》2003,36(2):124-35; discussion 149-50

A previous meta-analysis indicated that eight instructional factors--Questioning, Sequencing and Segmentation, Skill Modeling, Organization and Explicit Practice, Small-Group Setting, Indirect Teacher Activities (e.g., homework), Technology, and Scaffolding-captured the majority of successful intervention programs for adolescents with learning disabilities (LD). Most important was the Organization/Explicit factor, which contributed significant variance (16%) to effect size. This factor included two important instructional components: advance organization and explicit practice. In this article, we convert these findings into practical guidelines to direct instructional practice.  相似文献   

语篇的主谓推进模式分析     

郑梅 《伊犁教育学院学报》2006,19(4):151-156

主位推进模式理论是分析篇章段落中连续分句中主位、述位之间关系的一种理论,是分析篇章微观结构的重要手段.Halliday将信息结构与主述位结构分离的观点以及Danes的主位述位出现顺序决定语篇信息结构的观点为进一步划分主位推进模式提供了理论基础.通过了接主位推进模式,可以帮助作者们更好的构建篇章的整体框架.因此主述位推进理论对英语的写作、阅读等教学工作有重要的指导意义.  相似文献   

阿尔·法拉比的经院主义哲学思想     

罗梅 《齐齐哈尔师范高等专科学校学报》2011,(6):70-71

法拉比试图运用理性思辨的方法来论证伊斯兰教及其理论。他通过吸收柏拉图和亚里士多德的思想,形成了＂哲学统一＂的观点;创造性地提出＂流溢说＂,认为万事万物都是真主流溢的过程;充分肯定理性认识的重要作用,并提出建立一个高度理想化的社会——道德城,且把它看作是人类社会的必然产物。  相似文献   

试论我国仲裁司法监督的完善     

何梅 《连云港职业技术学院学报》2011,24(1):37-40

仲裁的司法性和本身的特点客观上需要对其进行监督。实践中,我国已经初步确立了以《仲裁法》为中心的监督体系,并呈现多元化的特点。司法监督虽然是辅助的一环但必不可少,我国现在的司法监督存在着一些需要完善的方面：国内仲裁和涉外仲裁的司法监督范围不一致;法院对仲裁裁决的司法监督的一审终局制;司法审查的参与者不完整;当事人申请撤销裁决的期限过长等等。  相似文献