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彩色多普勒能量图用于系统性硬皮病肢端动脉血流动力学分析研究 被引量:2
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作者 刘玥 《中国医学工程》 2010年第2期71-72,共2页
硬皮病是一种结缔组织疾病,分局限性、系统性两型,前者主要表现为局部皮肤硬化;后者除皮损外,并累及四肢末血管及内脏器官,肢端动脉病变是其常见合并症之一,
关键词 系统性硬皮病 彩色多普勒能量图 动脉病变 血流动力学 肢端 结缔组织疾病 分局限性 皮肤硬化
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反射疗法治愈声带息肉一例
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作者 王雪祥 《双足与保健》 2007年第1期4-5,共2页
声带息肉是临床上常见的喉科疾病。病因尚不十分清楚,可能与长期发声不当、长期不良刺激或慢性炎症有关。声带息肉分局限性声带息肉和弥漫性声带息肉两型。前者临床表现主要是声嘶,声嘶的程度因息肉的大小和部位不同而异,轻者仅有轻... 声带息肉是临床上常见的喉科疾病。病因尚不十分清楚,可能与长期发声不当、长期不良刺激或慢性炎症有关。声带息肉分局限性声带息肉和弥漫性声带息肉两型。前者临床表现主要是声嘶,声嘶的程度因息肉的大小和部位不同而异,轻者仅有轻微的声音变化;基底广的息肉声嘶较重,音调低沉而单调,重者嘶哑明显,甚至发音困难。喉镜检查可以确诊。目前,对应用药物久治不愈的声带息肉大多数采用手术摘除,但费用高且仍有复发的可能。 展开更多
关键词 声带息肉 反射疗法 治愈 临床表现 喉科疾病 慢性炎症 不良刺激 分局限性
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Seismic performance of double-skin steel-concrete composite box piers: Part Ⅱ—Nonlinear finite element analysis
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作者 夏坚 宗周红 +1 位作者 徐焯然 李明鸿 《Journal of Southeast University(English Edition)》 EI CAS 2016年第3期346-355,共10页
An accurate finite element ( FE) model was constructed to examine the hysteretic behavior of double-skin steel-concrete composite box ( DSCB) piers for further understanding the seismic performance of DSCB piers;... An accurate finite element ( FE) model was constructed to examine the hysteretic behavior of double-skin steel-concrete composite box ( DSCB) piers for further understanding the seismic performance of DSCB piers; where the local buckling behavior of steel tubes, the confinement of the in-filled concrete and the interface action between steel tube and in-filled concrete were considered. The accuracy of the proposed FE model was verified by the bidirectional cyclic loading test results. Based on the validated FE model, the effects of some key parameters, such as section width to steel thickness ratio, slenderness ratio, aspect ratio and axial load ratio on the hysteretic behavior of DSCB piers were investigated. Finally, the skeleton curve model of DSCB piers was proposed. The numerical simulation results reveal that the peak strength and elastic stiffness decrease with the increase of the section width to steel thickness ratio. Moreover, the increase of the slenderness ratio may result in a significant reduction in the peak strength and elastic stiffness while the ultimate displacement increases. The proposed skeleton curve model can be taken as a reference for seismic performance analyses of the DSCB piers. 展开更多
关键词 double-skin steel-concrete composite box(DSCB) pier finite element analysis local buckling hysteretic behavior skeleton curve model
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Research and improvement on the limitation of authentication test
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作者 刘家芬 Zhou Mingtian 《High Technology Letters》 EI CAS 2008年第3期266-270,共5页
This paper elaborated on the limitation of authentication test theorem, illustrated the fundamental cause of that limitation through examples, then enhanced authentication test to solve this problem, and also proved t... This paper elaborated on the limitation of authentication test theorem, illustrated the fundamental cause of that limitation through examples, then enhanced authentication test to solve this problem, and also proved the soundness of that improvement with formal method. The enhanced theory can deal with protocols with test component as proper subterm of other regular node' s component under certain conditions, and extend the application scope of authentication test. With enhanced authentication test, the automatic protocol verification tools will be more efficient and convenient. 展开更多
关键词 authentication test strand space formal method security protocol analysis
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Empirical Studies on L2 Communication Strategies over Four Decades:Looking Back and Ahead 被引量:3
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作者 郭继东 《Chinese Journal of Applied Linguistics》 2011年第4期89-106,128,共19页
Studies on communication strategies (CSs) have been carried out for nearly four decades and have contributed a lot to the development of such fields as applied linguistics and second language acquisition, but they a... Studies on communication strategies (CSs) have been carried out for nearly four decades and have contributed a lot to the development of such fields as applied linguistics and second language acquisition, but they are still inadequate and there remain controversies over certain issues. Thus, more systematic and rigorous studies are needed to check or confirm the findings of some studies and further CS research from newer and broader perspectives. This paper mainly reviews the existing empirical studies from different perspectives: CS classifications and research methods, factors affecting the choices of CSs, teachablity and teaching of CSs, and effectiveness of CSs. It is aimed to provide a clear picture of research on L2 CSs and offer some suggestions for further research. 展开更多
关键词 communication strategies empirical studies CLASSIFICATIONS LIMITATIONS suggestions
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