随机脉动风压下局部动力效应     

杨春秋  刘大全  曲乃泗 《大连大学学报》2002,23(4):5-9

本文研究了随机脉动风压下结构局部动力效应,文后通过实例计算证明了局部动力效应影响不可忽略,这对正确分析脉动风压下结构响应是具有应用价值的.  相似文献   

反馈环内外电抗元件对频率特性的影响分析     

陈兰莉 《安阳师范学院学报》2005,(5):35-37

通过对两种具有对比效果的电压并联负反馈放大电路的分析,得出影响频率特性的电抗元件包含在反馈环之内时,负反馈能改善由它引起的频率特性,而对反馈环外的电抗元件引起的频率特性,负反馈是无法改善的.  相似文献   

夏热冬暖地区教学办公建筑节能设计实践探索——以福建工程学院新校区某建筑设计为例     

吴聪慧  叶猛 《福建工程学院学报》2008,6(3):236-240

根据建筑功能要求和当地气候特点,在总体规划和单体设计中,科学合理地确定建筑朝向、平面形状、空间布局、外观体型、间距,选用节能型建筑材料,保证建筑外维护结构的保温隔热等热工特性,应用节能技术措施,尽可能减少建筑物能耗,获得理想的节能效果.  相似文献   

大跨钢管混凝土桁架拱桥的地震反应分析     

李少冲  张毅  范存新 《巢湖学院学报》2008,10(6)

以巫峡长江大桥为研究背景,通过建立空间结构有限元模型,计算和分析该大桥的动力特性,并运用时程分析法分析该桥的地震反应,采用EI-centro波进行计算,讨论横桥向和竖桥向地震动对地震反应的影响和规律,为大跨度钢管混凝土拱桥的抗震设计和研究提供了理论依据。  相似文献   

Transient response of piles-bridge under horizontal excitation     

朱斌  陈仁朋  陈云敏 《浙江大学学报(A卷英文版)》2003,4(1):28-34

Moving ships and other objects drifting on water often impact a bridge's pile foundation. The mechanical model of the piles-bridge structure under horizontal forcing was established, and a time-domain approach based on Finite-difference Method was developed for analyzing the dynamic response of the piles-bridge structure. For a single pile, good agreement between two computed results validated the present approach. The slenderness ratio of the pile, the pile-soil stiffness ratio and the type of the structure influence the dynamic response of the piles-bridge structure. The computed results showed that the stiffness of the structure determines the dynamic response of the piles-bridge structure under horizontal forcing. Project (No. 001110442) supported by the Science and Technology Bureau of Zhejiang Province, China.  相似文献   

A developmental review of response time data that support a cognitive components model of reading   总被引：2，自引：0，他引：2  

Greene  Barbara A.  Royer  James M. 《Educational Psychology Review》1994,6(2):141-172

The present article provides a review of numerous studies that measured response times for cognitive tasks related to six components of the reading process. The component processes were single-letter recognition, multi-letter unit identification, word and pseudoword identification, semantic access/concept activation, phrase and sentence comprehension, and text comprehension. The response time data are presented in tables and summarized in the text. The data provide support for a componential view of reading.  相似文献   

Review:DNA-damage response network at the crossroads of cell-cycle checkpoints, cellular senescence and apoptosis     

SCHMITT Estelle  PAQUET Claudie  BEAUCHEMIN Myriam  BERTRAND Richard 《Journal of Zhejiang University. Science. B》2007,(6)

Tissue homeostasis requires a carefully-orchestrated balance between cell proliferation, cellular senescence and cell death. Cells proliferate through a cell cycle that is tightly regulated by cyclin-dependent kinase activities. Cellular senescence is a safeguard program limiting the proliferative competence of cells in living organisms. Apoptosis eliminates unwanted cells by the coordinated activity of gene products that regulate and effect cell death. The intimate link between the cell cycle, cellular senes- cence, apoptosis regulation, cancer development and tumor responses to cancer treatment has become eminently apparent. Extensive research on tumor suppressor genes, oncogenes, the cell cycle and apoptosis regulatory genes has revealed how the DNA damage-sensing and -signaling pathways, referred to as the DNA-damage response network, are tied to cell proliferation, cell-cycle arrest, cellular senescence and apoptosis. DNA-damage responses are complex, involving “sensor” proteins that sense the damage, and transmit signals to “transducer” proteins, which, in turn, convey the signals to numerous “effector” proteins implicated in specific cellular pathways, including DNA repair mechanisms, cell-cycle checkpoints, cellular senescence and apoptosis. The Bcl-2 family of proteins stands among the most crucial regulators of apoptosis and performs vital functions in deciding whether a cell will live or die after cancer chemotherapy and irradiation. In addition, several studies have now revealed that members of the Bcl-2 family also interface with the cell cycle, DNA repair/recombination and cellular senescence, effects that are generally distinct from their function in apoptosis. In this review, we report progress in understanding the molecular networks that regulate cell-cycle checkpoints, cellular senescence and apoptosis after DNA damage, and discuss the influence of some Bcl-2 family members on cell-cycle checkpoint regulation.  相似文献   

浅谈对外贸易中的技术性贸易壁垒及其有效应对   总被引：1，自引：0，他引：1  

冷宇 《南通职业大学学报》2008,22(4):33-35

我国加入WTO之后,随着对外贸易的不断扩大,传统的关税、配额等壁垒正逐步拆除,但遭遇的技术性贸易壁垒却越来越多,也越来越严重,尤其是发达国家,利用其话语权和游戏规则制定权的优势．使这类技术性贸易壁垒显得“合理”而隐蔽。对此,需要由政府制订应对方案、企业提高竞争能力,共同采取积极、有效的措施,以打破这类技术性壁垒的限制。  相似文献   

Student evaluation of audience response technology in large lecture classes   总被引：2，自引：0，他引：2  

Erina L. MacGeorge  Scott R. Homan  John B. Dunning Jr.  David Elmore  Graham D. Bodie  Ed Evans  Sangeetha Khichadia  Steven M. Lichti  Bo Feng  Brian Geddes 《Educational technology research and development : ETR & D》2008,56(2):125-145

In the past few years, audience response technology (ART) has been widely adopted on college campuses, and is especially popular among instructors of large lecture classes. Claims regarding ART’s benefits to students have received only limited empirical evaluation, and prior studies exhibit methodological limitations. The current study provides a multi-dimensional evaluation, utilizing a newly-developed measure, the Audience Response Technology Questionnaire (ART-Q). Data were provided at three points during a semester by undergraduate students (n = 854) who used ART in three large lecture university courses. Results indicate moderately positive evaluations of ART on some dimensions (e.g., ease of use, impact on attendance), with less positive evaluations on others (e.g., influence on preparation for class). These evaluations showed some variability across time of semester and course, but were not substantially affected by gender, ethnicity, or year in school. Findings are discussed with respect to the need for future research on instructors’ techniques for using ART and their influence on student perceptions and outcomes.

Erina L. MacGeorgeEmail:

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从读者反应论看霍译本《红楼梦》文化内容翻译     

章丽娜 《临沂师范学院学报》2007,29(1):67-70

《红楼梦》是一部融合了中国几千年传统文化的经典著作,翻译这样一部巨著实属难事。霍克斯从一个外国人的角度来翻译《红楼梦》并且取得了巨大的成功,这在很大程度上取决于他从读者反应论出发,对《红楼梦》中有关文化内容的翻译采取了恰当的处理方法。通过摘取霍译本《红楼梦》中文化内容翻译的译例,并对之试做分析,可以看出读者反应论对汉英文化翻译的启示和指导作用。  相似文献