Study on Seismic Performance of Buckling-Restrained Brace and its Application on Reinforcement of School Building

防屈曲支撑作为一种新型消能构件，克服了传统支撑受压屈曲、无法充分发挥材料受压阶段的塑性滞回耗能功用的缺点，具有工作原理简单、明确、消能效果好等特点，是一种十分具有应用前景的结构消能构件。本文在国内外相关研究理论和方法的基础上，综合大量文献资料和工程实践经验，对防屈曲支撑做了以下几个方面的研究： 首先，对既有的防屈曲支撑研究进展资料进行构件、组件、结构体系三个层面的归纳与整理，为防屈曲支撑技术的下一步研究奠定理论基础。 其次，对影响防屈曲支撑构件性能的参数进行理论分析与公式推导，主要从防屈曲支撑构件的力学性质、稳定性、力学模型三方面进行归纳与总结。从防屈曲支撑构件延伸到防屈曲支撑结构层面，首...As a new type of energy dissipation component, buckling-restrained brace overcomes traditional brace's drawbacks, such as compression buckling, innability to make full use of material's plastic hysteretic energy dissipation function when under pressure. Buckling-restrained brace also has the advantage of its simple working principle and high-efficiency energy dissipation. It is a kind of very prom...学位：工学硕士院系专业：建筑与土木工程学院_防灾减灾工程及防护工程学号：2532010115169

Non- linear analysis on the performance of buckling restrained brace concrete school building

本文以一个中小学校舍抗震加固设计的实际工程为例,研究的目的是分析防屈曲支撑的滞回曲线,采用非线性时程分析的方法,简单介绍防屈曲约束支撑在MIdAS软件中非线性时程分析的应用过程,得到防屈曲支撑的滞回曲线与试验的滞回曲线相吻合。Taking an actual school building's seismic design as an example,The purpose of the study is the analysis of buckling- restrained brace hysteretic curve,Method using nonlinear time- history analysis,Application of nonlinear dynamic analysis in MIDAS software,the buckling restrained brace against simple introduction,Get buckling- restrained brace hysteretic curve and the experimental hysteretic curves coincide

两种不同入路的腹腔镜肾上腺嗜铬细胞瘤切除术

【目的】探讨两种不同入路的腹腔镜肾上腺嗜铬细胞瘤切除术。【方法】本组25例,男性14例,女性11例,平均53.3岁。左侧15例,右侧10例。术前均用苯苄胺等药物准备2～4周。经腹腔入路施行腹腔镜肾上腺嗜铬细胞瘤切除术11例,经腹膜后入路14例。在手术刚开始、建立气腹后、分离肿瘤时、切除肿瘤后分别记录心率、平均动脉压、中心静脉压的变化。【结果】1例早期经腹腔入路手术的病例在术中发现肿瘤粘连紧密改为开放性手术,其余24例在腹腔镜下顺利切除肿瘤。术后病理检查证实均为肾上腺嗜铬细胞瘤。术中脉搏血压没有剧烈波动。术后血压稳定,疼痛较轻,术后5～7d出院。经腹腔入路组与经腹膜后入路组在手术中心率、平均动脉压、中心静脉压以及手术时间和出血量等方面均没有显著差异(P>0.05)。无气胸、腹腔内脏器损伤、肠粘连等并发症。【结论】两种不同的入路施行腹腔镜肾上腺嗜铬细胞瘤切除术都是安全可行,具有操作精细、创伤小、恢复快等优点

关于“经济发展方式转变进程中的财税政策”的探讨(笔谈)

转变经济发展方式是当前中国的热门话题,而上海在城市发展中又肩负着率先转变的重要任务,在这一意义和背景下,2010年4月24日由上海金融学院学院主办、上海金融学院公共经济管理学院承办的“《中国城市财政发展报告2009/2010:促进‘两个中心’建设的上海城市财政》首发式暨‘经济发展方式转变进程中的财税政策’论坛“在我校举行。与会专家围绕经济发展方式转变进程中的财税政策的“趋势与目标“、“机遇和挑战“、“实施方略“和“地方实践“等四个专题进行研讨,各抒己见,智慧交锋。现将其真知灼见整理摘要与读者分享,以期待更多学者共同关注当前经济发展方式转变进程中的财税政策

大学生网络道德行为的现状研究

了解当代在校大学生在网络道德行为方面的现状，为高校的教育和教学提供更有针对性的一些科学依据。论文采用行为问卷的方式，对四百多名在校大学生进行了网络道德的测试。结果表明大学生在网络道德行为方面总体得分较高，在网络上的道德表现是随着性别而明显不同的。结论是大学生对网络的依赖程度较高，其网络道德行为表现出明显的性别差异。</jats:p

Multi-objective optimization on bionic fractal structure for heat exchanging of two fluids by genetic algorithm

Numerous industrial processes involve heat exchange, and the efficiency of energy usage depends heavily on the effectiveness of this exchange. Thermal structure is a critical factor that influences the process of heat transfer. The bionic fractal structure has been heavily researched due to its ability to provide a more uniform flow distribution and improved heat transfer performance. An iterative approach to determining the central wall temperature is suggested for heat transfer between two fluids with varying mass flow rates and physical features. A bionic fractal heat transfer model for two fluids was developed, and the features of the bionic fractal heat transfer structure with supercritical carbon dioxide (supercritical CO2) and H2O were expounded. Furthermore, the variation of heat transfer performance with parameters was analyzed comprehensively. A method for the optimization and design of a bionic fractal heat transfer structure using two fluids was also provided, and the index of heat transfer performance was found to have the best value for various structural factors. The multi-objective optimizations of the bionic fractal heat transfer structure were carried out by a genetic algorithm, and the results showed a 15% reduction in power consumption for the optimized heat transfer structure, a 2.4% increase in heat transfer, and an improvement in the index of heat transfer performance by 17%.(c) 2023 Elsevier Ltd. All rights reserved

基于多种介质的逆向射流特性研究

飞行器在大气层内飞行期间,气动热带来的高温会损害飞行器的结构完整性和内部设备,而气动阻力对推进系统提出了额外的要求。研究空天飞行器的气动减阻和热防护方案具有重要意义。采用数值模拟方法对以空气、氮气、二氧化碳为工质的逆向射流特性开展了研究。结果表明,逆向射流对钝头体防热减阻具有积极的作用,射流可以将前缘的激波朝飞行方向推离,形成脱体激波和再附激波,在飞行高度为30 km来流马赫数为4,射流总压为71172 Pa,总温为300 K的条件下,钝体总阻力下降可达20.5%,钝体前缘斯坦顿数最高下降93.7%;CO2射流的防热性能最优,N2防热能力次之,Air防热能力相对较差(如图1所示);减阻能力刚好相反,射流Air的减阻能力最优,N2减阻能力次之,CO2减阻能力相对较差。如图2所示,可以随着CO2的膨胀加速,温度不断降低,凝结相比例不断上升,在射流孔前0.0048 m处完全膨胀。因其凝结致使射流CO2动量下降,CO2射流膨胀最大速度低于N2和Air,其激波脱离位置更为靠近前缘,使其前缘部分阻力较N2和Air有所增加,射流CO2综合减阻能力略低于相同控制参数下的N2和Air;但是CO2存在较大的凝结潜热,带走的热量高于N2和Air,所以CO2射流降温能力高于相同控制参数下的N2和Air

Multi-objective optimization on bionic fractal structure for heat exchanging of single fluids by genetic algorithm

The heat transfer process using a single-fluid cooling wall is widely used in various fields, including highperformance computers, solar panels, automotive power supplies, and aerospace engine protection. In high heat flux environments, thermal management has become a significant challenge, and enhancing heat transfer is crucial for effective thermal management. Although parallel microchannel heat transfer structures are a current research focus due to their compact structure and easy manufacturing, their uneven flow distribution is a key constraint hindering further development. Bionic fractal heat transfer structures have gained widespread attention due to their favorable flow uniformity, high efficiency, and low energy consumption. Currently, the structural design of biomimetic fractal heat transfer structures mostly employs Murray's law and its derived parameters. A thermal design program suitable for variable flow rate and physical properties is proposed and a model for a single fluid biomimetic fractal heat transfer structure is established. The heat transfer characteristics of fractal heat transfer structures were explained using supercritical CO2 as a heat transfer medium. The study comprehensively analyzed the influence of different design parameters of single-fluid biomimetic fractal heat transfer structures on heat transfer performance and provided a method for optimizing their design. The results showed that there exists an optimal value for heat transfer performance indicators under different structural design parameters. Genetic algorithms are applied to multi-objective optimize the structural parameters of biomimetic fractal heat transfer structures and the performance indicator is improved by 21.6%

一种二氧化碳混合工质的循环微通道换热实验装置

本发明公开了一种二氧化碳混合工质的循环微通道换热实验装置,包括二氧化碳混合工质配气系统和M型循环实验系统,二氧化碳混合工质配气系统用于存储并提供不同实验参数的混合工质；M型循环实验系统用于提供多个首尾依次串联连接且呈M型分布的微通道换热实验段,每个微通道换热实验段均采用独立工作的加热装置,每个微通道换热实验段的加热温度相同或不等；M型循环实验系统的首尾均与二氧化碳混合工质配气系统连接以形成循环管路,使得同一种组合和实验参数的混合工质重复多次充入M型循环实验系统内进行实验；本发明形成循环实验管路,实现对多种混合工质的物性研究,满足现实工况中局部换热实验段的超高温模拟加热需求