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Investigation of FRP and SFRC Technologies for Efficient Tunnel Reinforcement Using the Cohesive Zone Model

Structural Durability & Health Monitoring 2024年第2期18卷 161-179页

作者： gang niu Zhaoyang Jin Wei Zhang Yiqun Huang China Communications Construction Investment Development Co. Ltd.Fuzhou350000China Rail Transit Branch of China Communications Construction Co. Ltd.Beijing101317China School of Civil Engineering Fujian University of TechnologyFuzhou350118China

Amid urbanization and the continuous expansion of transportation networks,the necessity for tunnel construction and maintenance has become *** this need requires the investigation of efficient,economical,and robust tunnel reinforcement *** paper explores fiber reinforced polymer(FRP)and steel fiber reinforced concrete(SFRC)technologies,which have emerged as viable solutions for enhancing tunnel *** is celebrated for its lightweight and high-strength attributes,effectively augmenting load-bearing capacity and seismic resistance,while SFRC’s notable crack resistance and longevity potentially enhance the performance of tunnel ***,current research predominantly focuses on experimental analysis,lacking comprehensive theoretical *** bridge this gap,the cohesive zone model(CZM),which utilizes cohesive elements to characterize the potential fracture surfaces of concrete/SFRC,the rebar-concrete interface,and the FRP-concrete interface,was employed.A modeling approach was subsequently proposed to construct a tunnel segment model reinforced with either SFRC or ***,the corresponding mixed-mode constitutive models,considering interfacial friction,were integrated into the proposed *** validation and numerical simulations corroborated the accuracy of the proposed ***,this study examined the reinforcement design of tunnel *** a numerical evaluation,the effectiveness of innovative reinforcement schemes,such as substituting concrete with SFRC and externally bonding FRP sheets,was assessed utilizing a case study from the Fuzhou Metro Shield Tunnel Construction Project.

关键词： Tunnel segment FRP SFRC cohesive zone model constitutive model fracture process

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Assessment of the Influence of Tunnel Settlement on Operational Performance of Subway Vehicles

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Structural Durability & Health Monitoring 2024年第1期18卷 55-71页

作者： gang niu Guangwei Zhang Zhaoyang Jin Wei Zhang Xiang Liu China Communications Construction Rail Transit Subsidiary Beijing100000China China Communications Construction Strait Construction Investment Development Co. Ltd.Fuzhou350000China School of Civil Engineering Fujian University of TechnologyFuzhou350118China

In the realm of subway shield tunnel operations,the impact of tunnel settlement on the operational performance of subway vehicles is a crucial *** study introduces an advanced analytical model to investigate rail geometric deformations caused by settlement within a vehicle-track-tunnel coupled *** model integrates the geometric deformations of the track,attributed to settlement,as track irregularities.A novel“cyclic model”algorithm was employed to enhance computational efficiency without compromising on precision,a claim that was rigorously *** model’s capability extends to analyzing the time-history responses of vehicles traversing settlement-affected *** research primarily focuses on how settlement wavelength,amplitude,and vehicle speed influence operational *** findings indicate that an increase in settlement wavelength can improve vehicle performance,whereas a rise in amplitude can degrade *** study also establishes settlement thresholds,based on vehicle operation comfort and *** insights are pivotal for maintaining and enhancing the safety and efficiency of subway systems,providing a valuable framework for urban infrastructure management and long-term maintenance strategies in metropolitan transit systems.

关键词： Settlement running performance subway tunnel dynamic analysis track irregularity threshold

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Effect of La on the Corrosion Behavior and Mechanism of 3Ni Weathering Steel in a Simulated Marine Atmospheric Environment

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 308-324页

作者： gang niu Rui Yuan R.D.K.Misra Na Gong Zhi-Hui Zhang Hao-Xiu Chen Hui-Bin Wu Cheng-Jia Shang Xin-Ping Mao Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX79968USA Institute of Materials Research and Engineering Agency for ScienceTechnologyand ResearchSingapore138634Singapore Department of Materials Science and Engineering University of TorontoTorontoONM5S 3E4Canada

The corrosion behavior and mechanism of 3Ni weathering steel in a simulated oceanic atmospheric environment are investigated in order to comprehend the impacts of La,as determined through electrochemical analysis and rust layer *** results of this study demonstrate that the addition of La enhances the corrosion resistance of 3Ni weathering steel in the marine atmospheric environment,thereby reducing the corrosion rate and improving the protection of the rust *** influence of La on corrosion resistance can be attributed to two primary ***,La functions as a grain refiner,minimizing the potential difference of the micro-regions on the substrate surface,thereby significantly reducing the corrosion of bare steel in the marine ***,La inhibits the process of Fe_(3)O_(4) oxidation back toγ-FeOOH during corrosion at the local site,thus decreasing the formation ofγ-FeOOH and enhancing the charge transfer *** research work may serve as a reference for expanding the application of rare earth elements in the field of weathering steel.

关键词： Weathering steel Rare earth Rust layer Corrosion behavior Corrosion resistance

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Surviving winter on the Qinghai-Xizang Plateau:Extensive reversible protein phosphorylation plays a dominant role in regulating hypometabolism in hibernating Nanorana parkeri

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Zoological Research 2024年第1期45卷 1-12页

作者： Yong-gang niu Deng-Bang Wei Xue-Jing Zhang Ti-Sen Xu Xiang-Yong Li Hai-Ying Zhang Zhi-Fang An Kenneth B.Storey Qiang Chen Department of Life Sciences Dezhou UniversityDezhouShandong 253023China State Key Laboratory of Plateau Ecology and Agriculture Qinghai UniversityXiningQinghai 810016China School of Life Sciences Lanzhou UniversityLanzhouGansu 730000China Department of Biology Carleton UniversityOttawaON K1S 5B6Canada

Changes in protein abundance and reversible protein phosphorylation(RPP)play important roles in regulating hypometabolism but have never been documented in overwintering frogs at high *** test the hypothesis that protein abundance and phosphorylation change in response to winter hibernation,we conducted a comprehensive and quantitative proteomic and phosphoproteomic analysis of the liver of the Xizang plateau frog,Nanorana parkeri,living on the Qinghai-Xizang *** total,5170 proteins and 5695 phosphorylation sites in 1938 proteins were *** on proteomic analysis,674 differentially expressed proteins(438 up-regulated,236 down-regulated)were screened in hibernating *** versus summer *** enrichment analysis revealed that higher expressed proteins in winter were significantly enriched in immune-related signaling pathways,whereas lower expressed proteins were mainly involved in metabolic processes.A total of 4251 modified sites(4147 up-regulated,104 down-regulated)belonging to 1638 phosphoproteins(1555 up-regulated,83 down-regulated)were significantly changed in the *** hibernation,RPP regulated a diverse array of proteins involved in multiple functions,including metabolic enzymatic activity,ion transport,protein turnover,signal transduction,and alternative *** changes contribute to enhancing protection,suppressing energy-consuming processes,and inducing metabolic ***,the activities of phosphofructokinase,glutamate dehydrogenase,and ATPase were all significantly lower in winter compared to *** conclusion,our results support the hypothesis and demonstrate the importance of RPP as a regulatory mechanism when animals transition into a hypometabolic state.

关键词： Nanorana parkeri Proteomic Phosphoproteomic Hibernation Reversible protein phosphorylation Metabolism

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论苏轼书画艺术的“活法”思想

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西南民族大学学报（人文社会科学版） 2024年第2期45卷 151-157页

作者：曾明牛刚西南民族大学中国语言文学学院四川成都610041 长江师范学院

“活法”说既是中国古代诗论中的重要理论话题,又是中国古典美学中的一个重要范畴。诗学“活法”说对我国古代文学艺术有着极为深远的影响。苏轼深谙“活法”的真谛,并创造性地将这一思想贯通于书画艺术实践之中。在对待前人古法的态度... 详细信息

“活法”说既是中国古代诗论中的重要理论话题,又是中国古典美学中的一个重要范畴。诗学“活法”说对我国古代文学艺术有着极为深远的影响。苏轼深谙“活法”的真谛,并创造性地将这一思想贯通于书画艺术实践之中。在对待前人古法的态度上,他主张“变古法”“出新意”。在艺术法度的把握上,他推崇“出新意于法度之中,寄妙理于豪放之外”。在探求艺术创作规律的过程中,他讲求“随物赋形”“行云流水”。苏轼对于“法”与“活”的认识,在整个艺术领域具有方法论上的普适性,同时具有鲜明的辩证色彩和可贵的实践品格。在推进文化自信自强,加快构建中国特色哲学社会科学话语体系的当下,苏轼“活法”思想的理论意义与实践价值或许能给我们一些启示。

关键词：苏轼书画艺术 “活法”思想当代价值

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高危型人乳头瘤病毒感染对妊娠结局及阴道微生态环境的影响

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实用医学杂志 2024年第15期40卷 2138-2141页

作者：李雅玲牛刚王伟成都医学院第一附属医院名山分院(雅安市名山区人民医院)妇产科四川雅安625100 中山大学附属第一医院妇科广州510080

目的探讨高危型人乳头瘤病毒(HR-HPV)感染对妊娠结局及阴道微生态的影响。方法选取于成都医学院第一附属医院名山分院进行产检的128例孕妇为研究对象。均进行阴道微生态及HR-HPV检测,采用单因素分析及多元线性回归分析明确孕妇HR-HPV感... 详细信息

目的探讨高危型人乳头瘤病毒(HR-HPV)感染对妊娠结局及阴道微生态的影响。方法选取于成都医学院第一附属医院名山分院进行产检的128例孕妇为研究对象。均进行阴道微生态及HR-HPV检测,采用单因素分析及多元线性回归分析明确孕妇HR-HPV感染的相关因素,研究HR-HPV感染对孕妇妊娠结局及阴道微生态的影响。结果感染组49例中16型HPV 30例(61.22%),18型HPV13例(26.53%),31、33、51、52、53、58型各1例。单因素分析显示HR-HPV感染与初次性行为年龄、避孕套使用、性伴侣数量、生殖道炎症、吸烟史显著相关(P<0.05)。多因素分析显示初次性行为年龄≤20岁、合并生殖道炎症、多个性伴侣、吸烟史为HR-HPV感染的独立危险因素,使用避孕套为HR-HPV感染的保护因素。孕妇乳酸杆菌数量、念珠菌感染以及阴道清洁度在两组间有显著差异(P<0.05)。HR-HPV感染组自然流产率以及胎儿生长受限发生率显著高于未感染组(P<0.05)。结论孕妇HR-HPV感染与过早性行为、性伴侣数量、生殖道炎症、吸烟等因素密切相关。妊娠期HR-HPV感染可致阴道微生态环境变化,并致不良妊娠结局。

关键词：高危型HPV感染妊娠结局阴道微生态环境

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稻瘟菌糖原合成酶激酶MoGSK3功能探究

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西北农林科技大学学报（自然科学版） 2024年第3期52卷 73-80,94页

作者：孔延元牛刚吴春兰王晨芳西北农林科技大学植物保护学院陕西杨凌712100

【目的】观测稻瘟菌(Magnaporthe oryzae)糖原合成酶激酶基因MoGSK3敲除突变体表型,明确MoGSK3在稻瘟菌中的潜在生物学功能,为挖掘防治稻瘟菌新型药剂的潜在靶标提供参考。【方法】基于同源重组原理,用split-PCR方法获得稻瘟菌MoGSK3敲... 详细信息

【目的】观测稻瘟菌(Magnaporthe oryzae)糖原合成酶激酶基因MoGSK3敲除突变体表型,明确MoGSK3在稻瘟菌中的潜在生物学功能,为挖掘防治稻瘟菌新型药剂的潜在靶标提供参考。【方法】基于同源重组原理,用split-PCR方法获得稻瘟菌MoGSK3敲除突变体菌株,将MoGSK3基因克隆到pFL2载体上得到MoGSK3-C融合载体,并将其通过PEG介导的原生质体转化法导入MoGSK3突变体中得到回补菌株。培养观察野生型菌株Guy11、突变体菌株G3-9及回补菌株GC-1的菌落形态和生长状况,采用实时荧光定量PCR(qRT-PCR)检测稻瘟菌产孢相关基因的表达量;观察稻瘟菌不同菌株的分生孢子形态,通过附着胞洋葱表皮穿透试验及接种水稻叶片,研究其致病力;通过KI-I_(2)染色对野生型菌株Guy11及突变体菌株G3-9分生孢子和附着胞中的糖原运输能力进行观测。【结果】稻瘟菌MoGSK3突变体存在多个表型缺陷,与野生型菌株Guy11相比,MoGSK3突变体菌株G3-9菌落直径显著变小,生长缓慢,产孢相关基因表达量下降且分生孢子出现末端伸长畸形的状态。MoGSK3基因缺失还会导致稻瘟菌菌丝末端无法形成正常的分生孢子梗,附着胞无法穿透洋葱表皮形成侵染菌丝,接种划伤水稻叶片也无法形成褐色病斑。对MoGSK3突变体菌株G3-9分生孢子及附着胞进行糖原染色后发现,突变体菌株G3-9在糖原转运能力方面存在明显缺陷。【结论】MoGSK3基因参与稻瘟菌的生长、分生孢子形成及形态建成、侵染、糖原转运等过程,是稻瘟菌重要的毒力因子。

关键词：稻瘟菌糖原合成酶激酶毒力因子药剂靶标

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Cold compression deformation method for reducing residual stress and uniformizing micro-property in ferrite steel

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Journal of Iron and Steel Research International 2022年第3期29卷 503-511页

作者： Bo Ning Hui-bin Wu gang niu Xin-pan Yu Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing100083China

To reduce internal residual stress and homogenize micro-property of hot-rolled ferrite steel,the cold compression deformation method with small reduction rate has been performed in the hot-rolled samples,and X-ray diffraction and nanoindentation test have been used to detect the residual stress and *** samples with deformation rate of 0-5.59%or annealing at 550℃ are *** results show that,due to the coupling effect of thermal expansion and cold contraction and the volume expansion of microstructural transformation from austenite to ferrite,compressive residual stress was found inside the hot-rolled *** the increase in cold compression deformation,the dislocation density increased and the microhardness increased gradually,and there is no obvious rule for the change of mean nano-hardness in micro-zone for the center of ***,the uniformity of nano-hardness in the micro-zone increased first and then decreased,and the value of residual stress has obvious corresponding relationship with the uniformity of micro-zone *** cold compression deformation with appropriate reduction rate can reduce residual stress and improve nano-hardness uniformity of the hot-rolled samples,but more deformation(such as reduction rateε=5.59%)makes residual stress increase and makes uniformity of nano-hardness deteriorate.

关键词： Ferrite Cold compression deformation Residual stress Nano-hardness Uniformity Dislocation density

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陕西省新确认水源性高碘地区1年后监测结果分析

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中国地方病防治 2024年第2期39卷 105-109,114页

作者：高雪娟栗珊珊牛刚郭大伟段刚陕西省地方病防治研究所陕西西安710006

目的了解陕西省新确认水源性高碘地区改水降碘落实情况,掌握重点人群碘营养水平,科学评价新确认水源性高碘地区高碘防治效果,为采取针对性防治措施和干预策略提供参考依据。方法根据《水源性高碘地区监测方案》(2018版),在陕西省新划... 详细信息

目的了解陕西省新确认水源性高碘地区改水降碘落实情况,掌握重点人群碘营养水平,科学评价新确认水源性高碘地区高碘防治效果,为采取针对性防治措施和干预策略提供参考依据。方法根据《水源性高碘地区监测方案》(2018版),在陕西省新划定的水源性高碘地区选取63个行政村为监测点,进行居民饮用水水碘含量检测;在每个监测点抽取8~10岁非寄宿儿童40名(男女各半)和孕妇20名,进行儿童及孕妇甲状腺B超检查、家中食用盐盐碘、尿碘检测。结果共采集水样190份,水碘中位数121.75μg/L。检测盐样2 159份,未加碘盐食用率17.79%,不同县区居民未加碘盐食用率差异有统计学意义(χ^(2)=722.85,P<0.001)。检测儿童尿碘1 924份,尿碘中位数为314.06μg/L;甲状腺B超检查1 879人,甲状腺肿大率和结节率分别为3.57%、20.33%。检测孕妇尿样229份,孕妇尿碘中位数为240.08μg/L;孕妇甲状腺B超检查143人,未发现甲状腺肿大者,甲状腺结节检出23人,甲状腺结节率为16.08%。不同高碘县区儿童尿碘中位数、甲状腺肿大率、甲状腺结节率差异均有统计学意义(H=371.65,χ^(2)=48.18、389.63,P均<0.05),不同高碘县区孕妇尿碘中位数、甲状腺结节率差异均有统计学意义(H=22.65,χ^(2)=12.35,P均<0.05)。结论陕西省新确认水源性高碘地区改水降碘防治措施落实不到位,高碘防治效果欠佳,应进一步加强新确认水源性高碘地区高碘危害综合防治措施落实,有效防控水源性高碘危害。

关键词：高碘地区儿童孕妇碘营养甲状腺

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Strength-ductility synergy in a 1.4 GPa austenitic steel with a heterogeneous lamellar microstructure

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Journal of Materials Science & Technology 2022年第11期106卷 133-138页

作者： gang niu Hatem S.Zurob R.D.K.Misra Huibin Wu Yu Zou Department of Materials Science and Engineering University of TorontoTorontoONM5S 3E4Canada Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering McMaster UniversityHamiltonONL8S 4L7Canada Department of Metallurgical Materials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX 79968USA Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering University of TorontoTorontoONM5S 3E4Canada

*** Advanced high-strength steels with good ductility are essen-tial to the manufacturing,structural safety,and light-weighting of load-bearing structures in many industries[1-3].Austenitic stain-less steel(ASS)exhibits high ductility due to the TRIP and/or TWIP effect that can alleviate stress concentration,prevent void nucle-ation,enhance work hardening,and postpone necking[4-6].The yield strength of conventional ASS is generally low(∼200-500 MPa),and their deformation resistance is insufficient for many load-bearing applications[6].Previous studies reported the in-creased yield strength in various austenitic steels through grain refinement,dislocation strengthening,precipitation strengthening,and heterogeneous hardening[7-14].A single strengthening mech-anism,however,is typically insufficient to obtain ultrahigh yield strength over 1 GPa in austenitic steel[12].

关键词： steel ductility austenitic

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