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结合一栋52层、高224.8m的超高层混合结构,对比分析了楼面钢梁连接方式对带加强层的超高层混合结构的性能、施工进度、造价等多方面的影响。分析结果表明,超高层混合结构楼面梁宜用两端铰接或与外框柱刚接、与核心筒铰接的连接形式;通过设置加强层形成刚臂-核心筒抗侧力结构体系能够有效抵抗水平荷载;楼面梁两端铰接与两端刚接相比能够节省约10%的上部结构造价。

结合一栋49层、高224.8m的超高层混合结构,对比分析了加强层设置方式对混合结构性能的影响。分析结果表明,对于风荷载起控制作用的超高层混合结构宜结合设备层设置多个加强层;加强层刚度越大,内力突变程度越严重;在设置伸臂桁架的同时设置腰桁架对提高框架核心筒结构刚度效果不明显,但能够提高楼层抗剪承载力。

结合实际工程探讨了采用屈曲约束支撑作为高层框架核心筒结构加强层伸臂桁架的可行性及优越性,对比分析了普通支撑与屈曲约束支撑加强层方案结构整体动力性能、层间位移角,以及大震下弹塑性基底剪力等。计算结果表明,在满足正常使用状态的情况下屈曲约束支撑可以选择相对较小的截面,在加强层采用屈曲约束支撑作为伸臂桁架能够有效降低结构刚度突变,通过屈服耗能以降低大震下的反应,减小地震作用对整体结构重要构件的破坏,屈曲约束支撑实现提高刚度、承载力同时减小刚度突变的和谐统一。

本文采用通用有限元软件ABAQUS对深圳大学生运动会游泳馆结构柱脚的受力性能进行了有限元分析,着重分析了上部铸钢节点各部件之间的接触关系和下部混凝土承台应力状态,获得了铸钢节点的应力状态和各部件之间的接触压应力以及下部混凝土承台内配钢筋、内置型钢和混凝土的应力状态,对不同工况进行了计算分析。研究结果表明,深圳大学生运动会游泳馆柱脚的设计是安全可靠的。本文的有关方法可为相关工程提供参考。

在大型通用有限元软件ABAQUS中,为混凝土材料定义了一种材料模型:塑性损伤模型。它可以模拟混凝土材料的拉裂和压碎等力学现象,而且使用也较为方便。在本文中,作者结合自己的研究工作,介绍了塑性损伤模型在钢管混凝土柱、型钢-钢管混凝土柱和钢管混凝土叠合柱静力性能分析中的应用,详细讨论了混凝土塑性损伤模型中有关参数的设置方法。计算结果表明,在准确合理建模和设置参数的前提下,可以利用ABAQUS中的塑性损伤模型准确地模拟钢-混凝土组合构件的静力性能,从而减小实验工作量,节约开支。本文的有关论述和方法可为同类研究提供参考。

体育馆看台是人员聚集的场所,看台结构的人致振动控制是设计的重点。本文介绍了国家游泳中心临时看台钢结构设计,包括结构布置、主体结构自振频率控制的计算分析、构件的自振频率的计算方法等。

介绍和论述了一种非常有实用前景的基于光纤非线性效应的光参量放大器 （ OPA）及其最新技术进展 .最新发展揭示了它的很多技术特性优于传统的掺铒光纤放大器 （ EDFA）、半导体光放大器 （ SOA）和近年来很热门的光纤拉曼放大器 （ FRA） ,如对信号的调制形式、比特率的完全透明性、相位共轭、超宽的增益带宽、很低的噪声指数和具备优异的全光波长转换功能 .

介绍了 VCSEL结构和技术特点 ,它以很高的性能价格比成功地应用于单通道和并行光互联 ,并将在宽带以太网、高速数据通信网中得到广泛的应用 .以 VCSEL为基础器件的高速大容量、高并行处理功能的光互连、光交换系统有着极好的应用前景

Copyright of Food & Fermentation Industries is the property of Food & Fermentation Industries and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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The capacity for scientific research and innovation in chemistry graduate students is crucial for national scientific advancement and socio-economic development. This paper examines the current state of the cultivation of scientific research innovation ability in chemistry graduate students at local universities. It discusses approaches to foster scientific research and innovation ability from two perspectives: the training management within the college and the mentorship methods of advisors, drawing on practical experience. The paper also presents preliminary successes in enhancing the research innovation abilities of graduate students, offering insights that could benefit similar programs in local universities. [ABSTRACT FROM AUTHOR]

Ultra-thin and porous MgCo2O4 nanowires with larger specific surface area was successfully synthesized on Ni foam by hydrothermal method with surfactant sodium dodecylsulphate. It showed that MgCo2O4 nanowires exhibited a dense interwoven and transparent net-like structure with a high specific capacitance of 2128 F/g at a current of 5 A/g. After 6000 cycles under the condition of 40 A/g, 98.4% of initial capacitance was retained. Additionally, asymmetric supercapacitor was assembled with this nanowires as binder-free positive electrode and activated carbon as negative electrode respectively, which displayed a specific capacitance of 65.32 F/g and energy density of 20.41 Wh/kg under the power density of 338.95 W/kg. The above results show that the asymmetric supercapacitor is a good energy storage device which has good potential in practical applications. [ABSTRACT FROM AUTHOR]

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Ultra-low permeability tight glutenite reservoirs are widely distributed in the Bohai Bay, China. Compared with conventional sandstone reservoirs, the tight glutenite reservoirs are rich in clay minerals, highly developed with dissolved pores and microfractures, and have strong heterogeneity. Invasion of injected fluids into the glutenite reservoirs easily induces formation damage and blocking of pore throats, thereby reducing the flow capacity and the production rates of oil and gas. Cores taken from the glutenite formation in the BZ19-6 block were evaluated for salt sensitivity damage according to the industrial standards and high temperature high back-pressure steady-state method. The types and in-situ characteristics of the sensitive minerals and salt minerals were analyzed using SEM. The experimental results show that the salt sensitivity of the Kongdian glutenite is moderately strong to strong. Since the lower the permeability of the core, the higher the damage to the porosity and permeability of the core by salt precipitation, it is thus recommended that for dense cores with permeability less than 0.1 mD and reservoirs temperature higher than 100 ℃, the high temperature high back pressure steady state evaluation method be used to evaluate the flow sensitivity of the reservoir rocks. The clay minerals in the Kongdian formation are mainly silky/filamentous illite, altered kalinite and mixed illite/montmorillonite which exist in the dissolution pores in the form of comb shell type, dispersed filling and bridging etc., and are the main causes of salt sensitivity of the reservoirs. High temperature accelerates the evaporation of formation water, causing salt precipitation near the wellbore. The precipitated salts are mainly potassium salt and halite which exist on the surfaces of the mineral particles and walls of the pores, and cause the pore throats to be easily clogged. The main mechanisms of dense glutenite formation damage by salt precipitation include static evaporation of formation water which leads to clogging of the dense pore throats, salt crystal migration during dynamic displacement which clogs the pore throats and the weakening of the rock strengths by salt precipitation which leads to particle migration. To minimize reservoir damage by salt sensitivity, KCl-salt saturated polymer sulfonate and zwitterionic polymer drilling fluids are recommended as the drill-in fluids, the filtration rates of the drilling fluids should be reduced, and the crystallization and nucleation of salts in the drilling fluids be inhibited. [ABSTRACT FROM AUTHOR]

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With the wide use of T-beam components in bridge and port construction, in order to explore the feasibility and characteristics of erecting T-beams with offshore floating crane, based on the construction practice in the execution of Contract Package I for the auxiliary wharf project for Huadian Fengsheng Shantou Power Plant, the advantages of technology for erecting T -beams with offshore floating cranes are verified by analyzing the key points such as scheme comparison, floating crane selection, sling and shackle checking, special hanger setting and stress ratio calculation, and T-beam installation process, thus confirming the advantages of the technology as simple and convenient, with short construction period, low cost, safety and reliability. It may also provide reference for similar projects in the future. [ABSTRACT FROM AUTHOR]

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Copyright of Coatings & Protection / Tuceng yu Fanghu is the property of Coating & Protection Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)