Results 51 to 60 of about 8,484 (166)
, 2018 大直径管棚保护下直接顶进预制箱涵技术是近年来国内发展起来的一种全新的施工技术,但其难度大,理论发展不完善,可借鉴的经验少.依托南昌市新龙岗大道下穿向莆铁路工程,根据实际工程情况建立力学分析模型,计算框架桥下钢管的受力,并根据钢管的受力情况假定钢管为Winkler弹性地基梁,运用弹性地基梁理论建立钢管挠曲微分方程并求解该微分方程,从而计算出框架桥顶进过程中的钢管挠曲变形,进而确定顶进过程中框架桥高程偏差情况.理论分析表明,底排管棚的支撑和引导作用有助于框架桥推进,并能有效遏制框架桥\"栽头\"和\"抬头\"
张昱 +4 more
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Journal of Critical Infrastructure Policy, Volume 7, Issue 1, Spring/Summer 2026.ABSTRACT The National Quality Infrastructure (NQI) in a given country provides the essential framework for quality assurance integrating standardization, metrology, accreditation, and conformity assessment to create the technical backbone for industry and trade. Hence, building a resilient NQI is fundamental to securing medicine quality, enabling local
Addisu Afrassa Tegegne +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan现有站房的规模和设施与实际客运需求的矛盾日益突出，因此全国掀起了铁路站房改扩建的浪潮。其中，将原站改扩建为高架候车厅站房的施工工况最为复杂，给施工单位带来非常大的挑战。基于株洲站改扩建工程，研究不停运营业线上盖高架候车厅改扩建施工关键技术，首先剖析了该类铁路改扩建工程的特点及难点，提出了平行于既有站台的大平行、小流水改扩建模式，解决了站厅施工与车站服务同步运营的关键性难题；然后提出了营业线钢柱施工技术、不停运营业线上盖混凝土结构支护体系的模块化技术和高架候车厅屋盖分区提升技术 ...
曹佐盛 +4 more
doaj +2 more sources
Jianzhu Gangjiegou Jinzhan, 2005 重庆江北机场航站楼钢结构由于结构复杂、体量大、构件重、跨内混凝土结构已先期完成、场地条件限制等原因,不宜常规吊装,采用“跨端组装,累积平移”的新工艺和计算机控制液压同步顶推技术进行施工,取得较好效益。本文介绍该工程的结构特点、施工难点、技术方案,以及施工阶段多工况结构分析、整体平移安装工艺、三向承力支承系统、减摩技术、计算机同步控制和姿态调节等关键技术与创新。
吴欣之 +4 more
doaj
Integrative Conservation, Volume 4, Issue 4, Page 555-568, December 2025.Sri Lanka's biodiversity is threatened by habitat loss, climate change, and ineffective traditional conservation methods. Integrating plant tissue culture and DNA barcoding offers scalable, precise tools for conserving rare and endemic species. This review emphasizes the potential of biotechnological approaches to enhance conservation accuracy and ...
Mylange Dona Kasundi Mekhala Gunasena +2 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2015 济南黄河公铁两用桥全长128m+3×180m+128m,是石济铁路客运专线工程横跨黄河的重点项目,为我国公铁两用桥上首次采用刚性悬索加劲弦连续钢桁梁结构。提出了3桁5跨的"钢桁梁带加劲弦顶推"刚性悬索加劲弦钢桁架梁桥施工新技术,给出了顶推的关键步骤,采用MIDAS-Civil软件对钢桁梁带加劲弦顶推施工全过程进行了仿真数值分析,解决了带弦顶推最大悬臂工况、加劲弦合龙等系列技术难题,验证了钢桁梁带加劲弦顶推施工新技术的安全性和可靠性。同时提出了落梁后吊杆安装的两个技术方案,通过数值模拟和综合考量 ...
王静峰 +4 more
doaj
Integrative Conservation, Volume 4, Issue 4, Page 527-533, December 2025.The recommendations cover four key aspects namely the definition of the taxa require high priority in the biodiversity conservation management, enhanced flexibility and adaptivity of the implementation processes, enforced integration of research advancement to enable the sustainable usage of plant resources, and finally actions to propose transboundary
Shi‐Cheng Shao +4 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2011 本文根据结构特点和施工环境,采用技术先进、安全可靠、方便快捷的"高空定点拼装、累积旋转滑移"施工技术,完成了158m大跨度折面型空间网格钢屋盖结构的安装。采用此定点拼装、累积旋转滑移技术,顺利地完成了主体育馆钢屋盖钢结构安装,最大限度地减少了钢结构施工对其它专业施工的影响,在保证施工安全的前提下,节约了安全措施成本,更好地保证了施工质量,保证了合同节点工期。工程实施过程中从未发生过一起安全事故,工程一次交验合格。
王恒, 魏成权
doaj
, 2011 柿竹园矿大范围破裂矿柱回采进行大爆破施工前,对装药区域的稳定性的监测与评价是确保大爆破施工安全与顺利实施的重要工作。基于柿竹园矿大范围破裂矿柱微震监测实例,详细分析了大范围破裂矿柱产生的原因,根据出矿对破裂矿柱稳定性的影响及微震监测结果,对破裂矿柱稳定性状态进行了评价。说明了微震监测能较准确地对破裂矿柱的活动状态进行监测,根据监测结果可以对破裂矿柱的稳定性状态进行较准确的评价与预警 ...
刘宏发 +5 more
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International Journal of Applied Linguistics, Volume 35, Issue 4, Page 1897-1911, November 2025.ABSTRACT Despite artificial intelligence (AI) emerging as a key driver of innovation and transformation in language education, how to enhance language teachers’ AI literacy and understand their emotional experiences in AI‐mediated teaching remains largely unexplored.
Xiao Xie +3 more
wiley +1 more source