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《Planning》2013,(1):89-90
本文对文化变迁的涵义和表现形式作了简要的探讨,重点分析了人口迁移流动对文化变迁的影响。不仅分析了人口迁移流动对文化涵化、互化与融合的影响,而且分析了人口迁移流动对文化冲突与整合的影响。关于人口迁移流动对文化变迁的影响的分析,文章不仅分析了影响的作用机理和过程,而且从人口迁移流动的不同类型分别进行了影响分析。文章最后提出了人口迁移流动对文化变迁的影响趋势。 相似文献
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本文介绍了300MW锅炉钢结构工程概况,分析了结构特点,制定了相应工艺措施。对原材料使用进行了严格控制,对材料的焊接性能要求作出工艺评定。对下料、制孔、组装、厚板焊接、焊后热处理、试装等制定了明确的工艺要求。对实施情况进行了总结,并提出了结论性意见。 相似文献
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本文介绍了智能家居系统的基本概念,对其功能和用途进行了论述,分析了当前国内外智能家居系统的使用状况。从不同角度对国内智能家居系统进行了分类,对智能家居的系统优势及发展方向提出了自己的观点。对"通讯网络架构"这一核心技术进行了深入的阐述,并对其在工程中如何选择提出了一些建议。 相似文献
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太原市"九五"期间地面沉降研究 总被引:2,自引:0,他引:2
本文对“九五”期间太原市地面监测情况做了介绍;对地面沉降量进行了计算与统计;并与“八五”期间的沉降量做了比较;绘制了沉降图。对“十五”期间沉降情况进行了预测;对沉降原因进行了分析,提出了控制地面沉降的建议。 相似文献
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苏州奥体中心体育场钢屋盖结构为马鞍形轮辐式单层索网结构,跨度260m。对双层索网和单层索网进行了选型对比,对索网进行了找形分析。为了考虑柔性屋面结构与风荷载之间的耦合作用,进行了气弹性模型风洞试验研究。柱脚销轴和铸钢采用了高强材料,减小了构件尺寸,达到美观效果。对部分V形柱边界条件进行释放,弱化了结构刚度,减小了基础沉降差异对钢屋盖结构受力的影响。对结构进行了考虑几何非线性和材料非线性的整体稳定分析。进行了柱脚节点的创新设计,并对其完成了有限元分析和节点试验。进行了柔性屋面大变形对附属结构影响研究,设置了钢屋盖健康监测系统。上述计算分析、试验和监测系统保证了结构的受力安全,可供类似工程设计提供参考。 相似文献
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本文对大同市云中大学设计评标作了较客观的介绍。简要说明了招标书及环境地形情况。对三个方案的共同优点作了肯定。并对2号中标方案的合理规划,分区明确,群体和谐,特别是对教学区的建筑功能与建筑风貌有所创新作了充分肯定。同时对中标方案直言不讳地指出了它的缺陷和同市政府对这次评标给予积极支持,并对三个方案不作任何暗示,也不定任何条框,这对评言,反复评比打下了良好的思想基础。从而使这次评标工作顺利园满的完成任务。 相似文献
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立足于提高司法鉴定质量,从检测鉴定机构和司法机构的角度出发,对建筑工程质量司法鉴定进行了探讨。主要对建筑工程质量司法鉴定的特点进行了综合阐述,对如何提高工程质量司法鉴定的客观性、科学性与准确性进行了全面分析,对工程质量司法鉴定存在的问题做出了总结,对工程质量司法鉴定的发展趋势做出了预测。 相似文献
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Mehdi GANJIANI Majid SAFARABADI Nabi MEHRI-KHANSARI Hossein ORUJI 《Frontiers of Structural and Civil Engineering》2021,15(2):552-567
Considering failures during machinery processes such as drilling, a precautionary analysis involving delamination and the corresponding dissipated energy is required, especially for composite structures. In this context, because of the complexity of both the analysis procedure and experimental test setup, most studies prefer to represent mode I and III interlaminar crack propagation instead of that involving mode II. Therefore, in this study, the effect of mode II delamination and corresponding interlaminar crack propagation was considered during the drilling process of multilayered glass/polyester composites using both numerical and experimental approaches. In the experimental procedure, the mechanical properties of the glass/polyester specimens were obtained according to ASTM D3039. In addition, the interlaminar mixed-mode (I/II) loadings were determined using an ARCAN test fixture so that the fracture toughness of glass/polyester could then be identified. The mode II critical strain energy release rate (CSERR) was then obtained using an experimental test performed using an ARCAN fixture and the virtual crack closure technique (VCCT). It was determined that the numerical approach was in accordance with the experiments, and more than 95% of crack propagation could be attributed to mode II compared to the two other modes. 相似文献
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振型分解法中合理振型数的确定 总被引:6,自引:0,他引:6
提出了振型分解法中采用振型位移控制的方法确定结构所需振型数,证明了国外所采用的有效质量法确定振型数的方法,并对两种不同的方法进行了比较。 相似文献
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Jae-Seung Hwang Dae Kun Kwon Ahsan Kareem 《Computer-Aided Civil and Infrastructure Engineering》2023,38(10):1274-1289
The mode shape is one of the important modal parameters that enables to visualize the intrinsic behavior of a structure as well as the quantity of interest by extracting or separating modal response from measurements. In this study, a new output-only framework is proposed to extract modes using a modal-based Kalman filter defined in the modal space and identify the mode shape by manipulating the correlation between the separated modes and the measured responses. It is also shown that the proposed framework can be extended to estimate the mode shapes of a non-classically damped structure in state space when the state variable is constructed from the measured responses and applied to the modal-based Kalman filter. The mode shape estimation framework proposed in this study was verified by numerical simulations and full-scale measurements. From the verification examples and their results, it was noted that the proposed modal identification framework is not influenced by the presence of noise, and it can be applied to identify the state-space mode shapes of non-classically damped systems as well as systems with very closely distributed modes such as buildings equipped with tuned mass dampers. 相似文献