碳纤维在旧桥加固中的应用

以内蒙古通辽市畅通桥加固为例,介绍了碳纤维增强复合材料（CFRP）技术的补强、加固原理、材料的性能、工艺流程及操作要求。该材料可延长桥梁的使用寿命,减少资金投入,在桥梁混凝土结构粘贴加固工程中值得推广应用。     

预应力纤维薄板加固T型梁桥技术探讨

预应力FRP片材加固技术可以使FRP的抗拉能力得到充分发挥,提高加固效率。采用体外钢绞线直线加载方式,对广东省东莞市内一座实桥的16 m T梁进行体外加载,成功地采用间接预应力方式对碳纤维薄板(CFL)施加了预应力,并对预应力CFL增强RC梁的力学性能进行了理论分析及实验验证。研究结果表明,与无预应力CFL加固件相比,预应力CFL加固RC受弯构件,可以明显改善RC梁在使用阶段的力学性能,但其极限荷载几乎不变。     

不同因素对公路用撒播融雪剂碳钢腐蚀影响的试验研究

融雪剂是道路常用的除冰雪方式,然而融雪剂对钢铁有一定的腐蚀作用,为了研究不同因素对融雪剂碳钢腐蚀的影响,试验分别研究了融雪剂溶液浓度、溶液配置方式、挂片旋转速度、不同水质和钢片对碳钢腐蚀率的影响。结果表明:在5%～15%浓度范围内,碳钢腐蚀率影响受融雪剂浓度影响较大,超过15%时,融雪剂浓度对碳钢腐蚀率影响较小,碳钢腐蚀率趋于稳定,且融雪剂浓度越大,碳钢腐蚀率越小;融雪剂中缓蚀剂的释放影响碳钢腐蚀率,不同试验方法对缓蚀剂的释放影响不同,机器高速搅拌对缓蚀剂释放更为有利;挂片旋转试验方法可以保证试片与溶液接触的均匀性,相较于静置试验,碳钢腐蚀率更高;碳钢腐蚀率的结果大小很大程度上取决于钢片的好坏,因此要严格控制钢片的质量。     

碳纤维复合材料在轨道车辆应用展望

文章首先介绍碳纤维复合材料在各国轨道交通领域的应用现状,并详细分析碳纤维复合材料在轨道车辆研发、制造、应用方面的关键技术。同时提出碳纤维复合材料在车辆应用的研究方法,并对碳纤维复合材料产业链发展前景进行分析,可为碳纤维复合材料在轨道交通装备制造领域的发展提供借鉴和思考。     

Development and prospects of key technology for submarine atmospheric environment control北大核心CSCD

Air regeneration, harmful gas purification and atmospheric composition monitoring are the key technologies of submarine atmospheric environment control systems. After years of development, China has made great progress in such systems, which have developed from ensuring the safety requirements of submariner and equipment operation to ensuring the health of submariner and reliability of system for long-term underwater operation. This paper reviews the development history of submarine atmospheric environment control technologies and introduces their future development prospects. The developers of integrated atmospheric environment control technology should learn from foreign submarine and aerosphere equipment technologies, which aim to support long-term submerged operation and comfort demands, and better adapt to future submarine technology development and evolving mission, in order to constantly enhance the level of submarine cabin air quality of the Chinese navy. © 2022 Journal of Clinical Hepatology. All rights reserved.     

基于随机退化路网的碳排放收费优化模型

结合随机通行能力退化路网和双参考点累计前景用户择路模型,构建了引导低碳出行的碳排放收费多准则双层优化模型.上层模型以系统碳排放量最少为目标,搜索最优收费路段并识别最优费率.下层模型基于双参考点累积前景用户和随机退化路网,构建综合考虑行程时间、累积到达时间感知价值、过路费和油费的多准则流量分配模型.设计了基于路段碳密度的启发式算法对模型求解,并采用双向 Nguyen Dupuis路网验证了模型和算法的有效性.研究表明,合理设置收费路段和收费标准能够有效降低全网碳排放总量,但若收费标准设置过高,会降低原瓶颈路段的通行能力,并人为制造新的瓶颈,反而使全网碳排放量上升.     

撞损桥梁加固设计

针对高速公路上一钢筋混凝土连续箱梁桥被油罐车撞损,进行计算分析,评价其安全性,提出碳纤维布加固主梁方案,并阐述碳纤维布的设计与施工要点。     

Assessing carbon footprint and energy efficiency in competing supply chains: Review - Case studies and benchmarking

This article compares the energy consumption and CO₂ emissions of supply chains in Belgium, France and UK looking in particular at, jeans, yogurts, apples, tomatoes and furniture. We use a generic methodology that allows comparability across the supply chain of products, supply chains, and countries. Our benchmarking show relatively high emissions for maritime transport and the consumer leg, while logistics activities such as storage and road freight exhibit relatively low emissions. The influences of distance, retail type, area density and consumer behaviour are also examined.     

Prioritizing mechanism of low carbon shipping measures using a combination of FQFD and FTOPSIS

As technical incentives, Ship Energy Efficiency Management Plan and Energy Efficiency Design Index, became the guidance for shipping companies in low-carbon shipping (LCS) integration. Despite the diversity of LCS measures, a mechanism to prioritize them is still urgently required from the view of shipping stakeholders. This paper developed a LCS measures prioritization mechanism for vessels relied on the combination of Fuzzy-based Technique for Order Preference by Similarity to Ideal Solution (FTOPSIS) and Fuzzy Quality Function Deployment (FQFD) so as to facilitate the treatment of uncertainties, thus realizing effective quantitative analysis of the LCS measures. Four performance aspects of LCS measures including ecological, reputation and competitive advantage, economic, and certainty level were analyzed and used for suitableness assessment, whereas weights of prioritizing criteria were determined by FQFD, alternatives were prioritized by FTOPSIS to build up a list of ranked LCS measures. The illustration example based on collected data of six alternatives was carried out to validate the feasibility of the methodology in prioritizing LCS measures. The outcomes can be used either as a stand-alone technique for prioritizing or as part of an integrated decision-making method for evaluating the effectiveness of chosen LCS measures.     

浅议老港区码头加固改造方法

老港区码头加固和改造是提升码头能力、缓解货物装卸压力的有效方法,具有周期短、节省资金、施工方便等特点,将会给港方带来巨大的经济和社会效益。介绍了传统的老港区码头改造加固方法以及结构粘钢技术和碳纤维加固混凝土技术在码头改造中的应用。对传统方法和两种新技术进行了比较。