共查询到20条相似文献，搜索用时 93 毫秒
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文章为深入了解空间KK型钢管节点在搭接连接时的承载性能,使用有限元软件Ansys,对不同几何参数下的空间KK型主方支圆搭接节点进行数值模拟,并将有限元分析结果绘制成曲线,分析β、γ、τ、Ov等几何参数对此类节点极限承载力的影响,最后利用有限元分析所得数值结果进行多元线性回归,得出了此类节点的极限承载力计算公式。 相似文献
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文章对某三塔斜拉桥进行全桥纵向安全复核计算,运用桥梁博士软件建立斜拉桥的数值仿真模型,对成桥后运营阶段全桥强度变形进行验算。通过分析计算,得出主塔正常使用极限状态抗裂性、位移、承载能力极限状态的强度、主梁正常使用极限状态下的应力、位移、抗裂性、斜拉索索力调整和验算结果。 相似文献
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碳纤维布补强加固混凝土结构技术作为一种新兴的加固方法,近年来得到了广泛的应用。该文以钢筋混凝土矩形截面梁为研究对象,通过有限元数值模拟,重点分析了在不同加固工况下试件屈服荷载和极限承载力的提高情况,计算结果与实验值吻合较好;同时分析了试件刚度的增强情况,最后对加固构件的受力性能进行了研究。 相似文献
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今年6月28日,国际汽联把一级方程式汽车大奖赛(F1)的商业开发权以2.1176亿英镑的超低价继续卖给英国人埃克尔斯通旗下的“一级方程式管理集团”,而且一卖就是100年,这种超常规的做法说明F1把自己的未来完全交给了这个68岁的英国男人 相似文献
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SummaryThe rate at which chloride ions diffuse from archaeological iron into a treatment solution depends on how the chloride ions are initially distributed in the corrosion layer. This paper compares solutions of the diffusion equation for two limiting cases: (1) where the chloride ions are initially spread uniformly through the corrosion layer; and (2) where the chloride ions are initially concentrated at the interface between the iron and the corrosion layer. Although the first model has been used in the past to describe chloride ions diffusing from marine iron, the second is more appropriate in cases where corrosion has drawn chloride ions toward the iron surface. Because diffusion processes in archaeological iron are complicated, the limitations of both these models are discussed. 相似文献
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Jennifer E. Nutefall 《Public Services Quarterly》2013,9(4):250-261
In Fall 2006, a faculty member in George Washington University's University Writing 20 (UW20) program began incorporating service learning into her theme-based first-year writing course. Along with her librarian partner, they linked two research assignments to the service work of the students. An end-of-semester survey was administrated over three semesters with one question asking if the student's research process was affected by their service experience. In reviewing and analyzing student comments, four themes emerged: increased motivation, use of numerical data and primary sources, increased knowledge in approaching and limiting topics, and the potential for bias. 相似文献
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Adopting the Orientation–Stimuli–Reasoning–Orientation–Response (O–S–R–O–R) model of political communication effects, this study examines the mediating roles of online/offline political discussion and political trust on the relationship between social media information seeking and online/offline political participation in China and Hong Kong. Findings through structural equation modeling showed that the relationship between information seeking and online participation was mediated by online discussion for both samples. Moreover, the relationship between information seeking and offline participation was mediated by offline discussion, and offline discussion mediated the relationship between information seeking and online participation. Political trust did not mediate any of the relationships in China and Hong Kong and all significant paths involving political trust were negative. Implications of the findings for youth political participation in China and Hong Kong are discussed. 相似文献
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遏制学术期刊无效信息的膨胀 总被引：11，自引：3，他引：8
分析当前学术期刊中存在大量无效信息并不断膨胀的导因，指出所带来的种种不良影响和严重后果，并就遏制其膨胀等问题提出一些建设性意见。 相似文献
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传播力是引导力、影响力、公信力的基础。在全球抗击新型冠状病毒疫情的时刻,《新华日报》作为主流媒体如何做到"居高而声自远"?本研究以"新华日报"与"抗疫"或"防疫"或"防控"或"疫情"为高级检索关键词,使用Gooseeker和八爪鱼采集器进行网页数据采集。通过将数据分为暴发期、平稳期两个参照组,针对"两微一端""政务平台""地方报刊"三个独立结构单位进行考察。结合传播力影响半径公式得出以下结论:《新华日报》抗疫报道在"两微一端"的传播力影响半径最大。"两微一端"倾向于吸收《新华日报》中疫情进展通报、防控政策、民生、交通、社会安全、科普辟谣的相关报道内容。与《新华日报》抗疫报道互动紧密的政务类平台,除了省级相关职能部门,"苏州工业园区管理委员会"和"中国淮安"显示度高。平稳期《新华日报》抗疫报道对政务类平台的传播力指数更高。《新华日报》抗疫报道在江苏以外的地方级报刊中传播力影响半径不大,这与疫情发展态势、媒体性质亦有关系。 相似文献
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《Journal of Radio & Audio Media》2013,20(2):310-328
The struggle for community radio in Austin, Texas, shares much with those of other alternative media, while providing almost a limiting case among participatory community radio in the United States. Commonalities and limiting case properties emerge in the context of a comparison to a recent JRS case study. External and internal power relationships, personal engagements, and the importance of praxis versus theory are commented on in the context of struggles with dominant local institutions, and among underserved populations internal to the station. What is arguably one of the most cooperative, democratic models for alternative media devolved into civil suits brought between factions. 相似文献
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[目的/意义] 科学合理地评价我国各省公共图书馆发展水平,可为促进公共图书馆资源均衡配置和评估定级工作的开展提供有益的参考。[方法/过程] 从基础条件、财政支出、资源利用、民众受益4个维度构建公共图书馆发展水平评价指标体系,采用PLS结构方程模型对2012年我国31省公共图书馆的发展水平进行评价。[结果/结论] 我国公共图书馆发展水平区域差异显著,东部地区公共图书馆发展水平最优,中部地区次之,西部地区较差。运用聚类分析方法,将我国31个省区公共图书馆的发展水平分为5类。 相似文献
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高位均衡是图书馆服务在数量均衡发展之后所要达成的质量均衡的高位发展态势与总体特征,其依据是生态位理论、均衡服务理论、高位均衡发展理论。图书馆均衡服务高位均衡的发展,是在深刻认识其生态位内涵与基本理论的基础上,构建基于生态位理论的图书馆服务高位均衡发展的战略框架,提出其发展的生态位形式及生态位策略,目的在于实现图书馆均衡服务的高位均衡发展。 相似文献