共查询到19条相似文献，搜索用时 171 毫秒
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将超高层连体结构等效连续化为连体Timoshenko粱,用哈密顿原理推导控制方程和边界条件,以常微分方程求解器(ODE)为工具,在弹性范围内对超高层连体结构进行了自由振动分析计算.通过算例结果与通用有限元软件sap2000分析结果对比表明,此简化分析方法是合理的,结果满足工程精度要求. 相似文献
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北镇的崇兴寺双塔作为中国辽代密檐式砖塔的重要实例,双塔上的砖雕体现了辽代晚期的时代特征和当时人们对佛教的推崇。本文着重叙述了北镇崇兴寺双塔上的砖雕,通过研究与分析砖雕的位置分布、题材内容、艺术形式等方面,阐明了崇兴寺双塔砖雕的艺术特点和独特之处,并且调查和研究崇兴寺双塔的砖雕,有助于了解辽代的佛教文化、建筑形式和雕刻艺术等内容。 相似文献
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文章基于双塔斜拉桥物理力学效应视角,分析了产业价值链的集群效应、链式效应与双塔斜拉桥物理力学原理的融合,探讨了“哑铃式”产业一体化战略在区域产业价值链构筑中所彰显的双塔斜拉桥力学效应---垂直重力的集群效应与水平张力的链式效应,诠释了“哑铃式”产业一体化战略模型均衡有力拉动区域产业经济结构快速转型发展的效用与处理好政府与市场的关系有着深远战略指导意义。 相似文献
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在传统的中日语法体系里,对于名词的修饰,基本遵循定语修饰名词、连体修饰语修饰名词的原则,但面对目前层出不穷的非语法规则的结构,诸如“程度副词＋名词”的结构,应该如何看待？本文就此进行了探讨。 相似文献
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汉语的区别词和日语的连体词都具有"专职的体词修饰语"功能,但两者都不是传统词类,而是从形容词中独立分出来的新型词类.它们的成员绝大多数来自其他词类或由短语凝固而成.本丈对两者的来源与结构特点进行了对比,单纯词主要考察其来源,并解释其词性转移的原因;合成词主要考察其结构特点,并归纳其结构上的异同. 相似文献
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基于模糊集合的退化字符图象的骨架法结构形态研究的识别方法,可直接应用于退化字符的模糊或灰度图象,因此对噪声不敏感;对笔者划缺损字符可正确的提以整个骨架;处理连体字符时能根据骨架的形状结构特征较容易地确定切分位置,经修剪算法对各切分点的处理,被分离的骨架可直接通过分类器而不必再作进一步处理。经测试,７５％以上的连体字符的切分位置其切分条件假设的排序最高。 相似文献
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日语的连体修饰节和汉语的定语两者都位于被修饰语之前,有着相似之处,但是由于连体修饰节比连体修饰语多一些附加成分,形式上较为复杂,不能简单地直接对应为汉语的定语,本文将通过语料库①的检索探讨其具体的翻译方法及采取这种翻译方法的原因. 相似文献
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大型输电铁塔广泛应用钢管节点,为了简化制作安装,避免复杂的相贯线切割,塔身斜材与主材的连接经常将钢管开长槽孔和插入的钢板焊接.由于钢管截面只是部分和钢板连接,在拉力作用下,管板节点易发生剪切滞后破坏.为研究剪切滞后对管板节点受拉极限承载力的影响,进行了一系列分析,并将研究结果和现行设计规范公式进行了比较. 相似文献
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介绍了漂白工段在制浆造纸工业中的重要性及其工艺流程,针对漂白工段碱化塔复杂的工艺特性,采用多模态控制算法实现对塔温的优化控制,同时给出了基于西门子S7-400控制系统的硬件结构及系统配置. 相似文献
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Kinematic measures of children's reaching were found to reflect stable differences in skill level for planning for future actions. Thirty-five toddlers (18-21 months) were engaged in building block towers (precise task) and in placing blocks into an open container (imprecise task). Sixteen children were retested on the same tasks a year later. Longer deceleration as the hand approached the block for pickup was found in the tower task compared with the imprecise task, indicating planning for the second movement. More skillful toddlers who could build high towers had a longer deceleration phase when placing blocks on the tower than toddlers who built low towers. Kinematic differences between the groups remained a year later when all children could build high towers. 相似文献
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为了探索双壁波纹塑料管用作水井井壁管和滤水器安装井管时的轴向抗拉能力,本研究以PVC双壁波纹管加工成的双壁波纹管滤水器圆管和条板材料为研究对象、并对其管接头采用密封圈加固,螺钉加固,铁丝绑扎,管箍铁件连接四种不同加固方式,在万能拉力机上进行拉力对比试验,结果表明：开有条形孔的管材的抗拉力明显低于末开孔的,开孔率越大,抗拉力越低;3个相同试件破坏时的拉力最大为3kN,最小为2．93kN,差值为0．07kN。相差不大;开孔率相同的板状试件．波纹糟中开孔的抗拉力较棱上开孔的高28％～63％;单纯承插连接,接头抗拉力太小,不能用于井管连接;螺钉加固,铁丝绑扎加固的接头抗拉力比较强,且成本低,管箍铁件加固抗拉力大,但成本高,故建议采用承插螺钉加固与铁丝绑扎加固用于浅井和中深井。管箍铁件加固用于深井。 相似文献
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为进一步提升我国船舶制造企业生产管理水平,实现生产全过程监控,提高造船效率,提出一种基于数字孪生理论的精细化造船工时管理模式,通过建立二维三维数字孪生模型、系统架构和数据映射逻辑结构,在生产计划、监控通讯设备及企业知识的助力下,实现生产数据实时信息共享及人员、设备、材料有效集成。试验结果表明,数字孪生技术的运用使返工率降低17.6%,修正吨位提高12.4%。基于数字孪生驱动的造船精细化工时管理模式完成了数字化、集成化、智能化、标准化的工时管理信息系统构建,可降低生产管理成本,提高生产效率,提升造船企业核心竞争力。 相似文献
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周树军 《商丘师范学院学报》2004,20(3):169-171
英语成对词是英语惯用语的一个重要组成部分，在结构上体现了英语合成短语的结构特征。虽然属于口语语体，但经常运用于其他语体，具有丰富的话语和文体功能。 相似文献
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Collapses of transmission towers were often observed in previous large earthquakes such as the Chi-Chi earthquake in Taiwan
and Wenchuan earthquake in Sichuan, China. These collapses were partially caused by the pulling forces from the transmission
lines generated from out-of-phase responses of the adjacent towers owing to spatially varying earthquake ground motions. In
this paper, a 3D finite element model of the transmission tower-line system is established considering the geometric nonlinearity
of transmission lines. The nonlinear responses of the structural system at a canyon site are analyzed subjected to spatially
varying ground motions. The spatial variations of ground motion associated with the wave passage, coherency loss, and local
site effects are given. The spatially varying ground motions are simulated stochastically based on an empirical coherency
loss function and a filtered Tajimi-Kanai power spectral density function. The site effect is considered by a transfer function
derived from 1D wave propagation theory. Compared with structural responses calculated using the uniform ground motion and
delayed excitations, numerical results indicate that seismic responses of transmission towers and power lines are amplified
when considering spatially varying ground motions including site effects. Each factor of ground motion spatial variations
has a significant effect on the seismic response of the structure, especially for the local site effect. Therefore, neglecting
the earthquake ground motion spatial variations may lead to a substantial underestimation of the response of transmission
tower-line system during strong earthquakes. Each effect of ground motion spatial variations should be incorporated in seismic
analysis of the structural system. 相似文献
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Sex differences in the etiology of aggressive and nonaggressive antisocial behavior: results from two twin studies 总被引：6，自引：0，他引：6
Recent theory and results from twin and adoption studies of children and adolescents suggest greater genetic influence on aggressive as compared to nonaggressive antisocial behavior. In addition, quantitative or qualitative differences in the etiology of these behaviors in males and females have been indicated in the literature. The Child Behavior Checklist was completed by the parents of 1022 Swedish twin pairs aged 7-9 years and of 501 British twin pairs aged 8-16 years. Genetic factors influenced aggressive antisocial behavior to a far greater extent than nonaggressive antisocial behavior, which was also significantly influenced by the shared environment. There was a significant sex difference in the etiology of nonaggressive antisocial behavior. Bivariate analyses supported the conclusion that the etiologies of aggressive and nonaggressive antisocial behavior differ for males and females. 相似文献
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凤岗碉楼与开平碉楼比较研究 总被引：1，自引：1，他引：0
梅伟强 《五邑大学学报(社会科学版)》2010,12(2):1-4
东莞市凤岗镇现存碉楼（当地人习称“炮楼”,专家建议改称“排屋楼”）120座。凤岗碉楼与世界文化遗产开平碉楼在历史、数量、形制、风格等诸多方面各有异同,具有鲜明的客家文化与外来文化融合的特色。独具的历史文化价值使凤岗碉楼成为“客侨文化”的典型代表。 相似文献