不同类型手倒立动作的肌电变化特征分析     

于建成  王健  徐冬青  张薇  史琳琳  赵卫华 《天津体育学院学报》2006,21(6):528-530

采用肌电图学与运动学对天津体操队男子运动员完成的自由体操、双杠和吊环三种类型手倒立动作进行了同步分析。结果表明：不同类型手倒立动作在完成过程中，主要参与调控身体平衡肌群的肌电变化存在差异性（P〈0．05）。据此，提出了针对这三种类型手倒立动作的训练方法。旨在为今后体操运动员的训练提供参考。  相似文献   

Cruising through the stacks: Developing tools to rapidly and economically mass-produce stack end signage: A case study     

Rodrigo C. Castro 《Journal Of Access Services》2017,14(1):16-28

The purpose of this article is to describe a case study that addresses issues related to stack end signage in a university library. Poor stack end signage can negatively influence patrons' ability to navigate the library and locate physical materials. At the Monsignor William Barry Memorial Library, a tool was developed using Microsoft Excel and Microsoft Word to quickly and inexpensively mass-produce effective and user-friendly stack end signage. This article details the specific steps taken to develop, implement, and utilize this instrument.  相似文献   

协庄井田11105W工作面底板突水可能性分析     

王景平  张晶  袁晓兰 《德州学院学报》2006,22(2):93-96

依据山东省协庄井田11105W工作面的物探资料和附近的钻孔资料,对该工作面奥陶系灰岩岩溶发育程度、富水性进行了评价及预测,最后对11105W工作面底板奥陶系灰岩突水的可能性进行了分析和评价.  相似文献   

Finite element study on impact sound transmission through a floating floor     

MAO Jian-xi 《重庆大学学报(英文版)》2007,6(3):213-220

To understand the characteristics of impact-sound transmission through a floor is very helpful for developing sound attenuation strategies to acquire a high quality of dwellings. Sound transmission through a floating floor to the room underneath was modeled by finite-element method (FEM). The sound pressure levels calculated by the FEM model on a scale of 1:4 was compared with the measured values, which demonstrate good agreement, particularly for impact sound of a relatively low frequency. The sound pressure level in a receiving room is strongly affected by the structural characteristics of both the floor and the room. The sound pressure transmitted through a clamped floor is lower than through a simply supported floor because of the larger rigidity of the clamped floor that contributes to the attenuation mechanism of stiffness. Increase in the thickness of the fiber-glass damping layer in the floor improves sound insulation. A larger room has a larger capacity to dissipate the sound pressure and thus has a lower sound pressure level. An asymmetric configuration of room avails sound attenuation because it has weaker structural and acoustic coupling than a symmetric one.  相似文献   

改性环氧丙烯酸UV树脂的合成及应用     

张桂盈  杨鲜  张险峰 《兰州石化职业技术学院学报》2003,3(4):5-6

采用聚乙二醇(200)代替部分丙烯酸来改性环氧丙烯酸UV树脂，可保持光固化时间基本不变而改变EA树脂的脆性，讨论了改性剂用量、催化剂选择、温度控制，得出了适宜反应条件。此树脂可和EA树脂配成UV木地板涂料。  相似文献   

现浇楼板砼裂缝的防治与控制     

徐广舒  徐宏 《南通职业大学学报》2002,16(2):39-40,48

随着现浇楼板、商品混凝土的广泛应用和砼强度的提高，现浇楼板中出现的裂缝问题也越来越备受人们关注，本文结合工程实践，分析了裂缝的原因，并提出防治与控制方法。  相似文献   

现浇混凝土楼板裂缝成因与防治措施     

邹林 《长江工程职业技术学院学报》2007,24(3):48-50

现浇钢筋混凝土楼板裂缝的影响因素很多.本文主要从材料、设计及施工等几个方面的原因着手分析,并针对上述成因提出相应的裂缝防控措施,对已形成的裂缝提出有效的补强加固方法.  相似文献   

图书馆开放意识研究   总被引：1，自引：0，他引：1  

张靖安  袁放建 《图书馆学研究》2003,(7):94-97

我国图书馆长期以来缺乏开放意识，导致很难适应现代科技社会的发展，本文分析了缺乏开放意识的原因和应采取的对策。  相似文献   

世界男子自由体操发展趋势研究   总被引：4，自引：1，他引：3  

陈剑昌  孟宪林 《成都体育学院学报》2003,29(5):48-51

以36届体操世锦赛为对象,研究了男子自由体操的发展趋势。结果表明:整套动作的发展潮流是,以单个或合成SE组开场;中串多以3个直体空翻连续转体1260°以上来提高连接价值;最后以E组或D E的挂串连接结束。以此为基础,简要分析了目前我国自由体操存在的差距及其原因。  相似文献   

Query Expansion with Long-Span Collocates   总被引：1，自引：0，他引：1  

Olga Vechtomova  Stephen Robertson  Susan Jones 《Information Retrieval》2003,6(2):251-273

The paper presents two novel approaches to query expansion with long-span collocates—words, significantly co-occurring in topic-size windows with query terms. In the first approach—global collocation analysis—collocates of query terms are extracted from the entire collection, in the second—local collocation analysis—from a subset of retrieved documents. The significance of association between collocates was estimated using modified Mutual Information and Z score. The techniques were tested using the Okapi IR system. The effect of different parameters on performance was evaluated: window size, number of expansion terms, measures of collocation significance and types of expansion terms. We present performance results of these techniques and provide comparison with related approaches.  相似文献