Results 41 to 50 of about 11,927 (158)
Latin American Policy, Volume 17, Issue 1, March 2026.ABSTRACT The rise of ride‐hailing platforms has profoundly transformed urban mobility in Latin America over the past decade. Transportation Network Companies such as Uber, DiDi, Cabify, InDrive, and others operating in the region have affected transportation patterns and intensified debates around labor relations, algorithmic management, regulatory ...
Ronald Sáenz‐Leandro
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Gaoya dianqi, 2023 全链路仿真常用于验证柔性直流换流阀阀控系统全部板卡接入时的功能和性能。文中基于全链路仿真实验结构分析，提出了一种全链路仿真实验的优化方法，在满足阀控动态性能实验要求的基础上，降低了仿真系统的复杂度。分析全链路仿真系统结构，提出仿真实验结构优化方案；对比实际换流阀及全链路仿真试验延时，提出仿真实验延时优化方法；最后，搭建工程实验系统进行验证。实验结果显示，该优化方法具有实验回路复杂度低和链路延时小的优点，可满足阀控功能性测试和动态性能测试的需要。
蒋妮娜 +4 more
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Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Spatial segregation in at‐sea distribution is frequently observed in seabirds and can have important implications for conservation and management. Globally, many albatross and petrel populations are declining due to bycatch in fisheries. In South Georgia, the decrease in wandering albatrosses (Diomedea exulans) differs among breeding sites ...
V. Warwick‐Evans +3 more
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Jianzhu Gangjiegou Jinzhan, 2022 为了研究腹板开椭圆孔耗能支撑的滞回性能，进行了3个支撑试件的低周往复加载试验，研究支撑长细比和耗能腹板长度对这种支撑耗能能力和滞回性能的影响，得到试件的滞回曲线、骨架曲线、刚度退化曲线、延性系数、等效黏滞阻尼比等。试验结果表明：在低周往复荷载作用下，腹板开椭圆孔耗能支撑依靠腹板开孔板件进入塑性耗散能量。耗能支撑滞回曲线饱满，耗能能力强，初始刚度较高。孔间板件断裂破坏导致耗能支撑试件失效，试件呈现延性破坏。试验过程中，中部工字钢保持弹性状态，没有进入塑性。相同长细比下耗能腹板的长度越长 ...
沈婷悦, 赵宝成
doaj
International Journal of Applied Linguistics, Volume 36, Issue 1, Page 522-539, February 2026.ABSTRACT This paper examines the features of metadiscourse across different teacher moves in university linguistics classroom discourse and the teaching strategies reflected in its use. The results reveal that teachers employ diverse metadiscourse during classroom interactions to support student reasoning.
Jingjie Li, Wenjie Hu
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Jianzhu Gangjiegou Jinzhan设计制作了4个H型钢梁试件，通过拟静力试验得到不同腹板高厚比以及钢种组合下钢梁的破坏形态、滞回曲线、骨架曲线以及延性等，从而评价试件的滞回性能。随后利用有限元软件ABAQUS进行模拟验证，通过参数分析进一步补充不同腹板高厚比和钢种组合对钢梁滞回性能的影响。结果表明：随着腹板高厚比的减小，钢梁的延性和耗能能力均有所提高，且增大腹板厚度对钢梁延性的提高程度大于极限承载力的提高程度；相比同钢种钢梁，多钢种钢梁极限承载力提高了17.4%，延性降低5.6%。随着多钢种钢梁翼缘强度等级的增大 ...
朱爱珠 +4 more
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SWEET1‐mediated glucose transport is crucial for energy availability in Arabidopsis
New Phytologist, Volume 249, Issue 4, Page 1816-1830, February 2026.Summary The stress‐responsive hormone abscisic acid (ABA) is known for its inhibitory effects on various physiological processes, including seed germination, often resulting in energy deprivation. Interestingly, ABA‐induced germination inhibition can be alleviated by exogenous glucose (Glc), mimicking a functional interplay between ABA and sugar ...
Xueyi Xue +3 more
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Jianzhu Gangjiegou Jinzhan, 2019 为进一步研究装配式钢结构H形钢梁-钢管柱连接节点的力学性能,以装配式钢管柱-组合螺栓连接节点试件为研究对象,利用ANSYS有限元软件对其进行了低周往复荷载作用下的抗震性能数值模拟分析。基于数据的整理和对比,分析节点试件的破坏模式、耗能能力、承载力、延性、刚度退化等力学性能。研究结果表明:由于对穿螺栓具有将钢梁上、下翼缘轴力直传至钢管柱对面的作用,在循环往复荷载作用下,钢管柱柱壁均出现"对称凹屈"现象,随后以梁端出现塑性铰丧失承载能力而破坏;节点承载力较高且耗能能力强,等效黏滞阻尼系数平均大于0.4 ...
王燕, 马强强, 杨怡亭, 刘秀丽
doaj
Jianzhu Gangjiegou Jinzhan, 2023 为研究考虑型钢初应力的活性粉末混凝土（RPC）包钢组合柱的轴压性能，完成了4根H形截面柱和1根方形截面柱的轴压静载试验。讨论了各参数对组合柱破坏形态、荷载-应变曲线、荷载-位移曲线、承载力和延性的影响。试验结果表明：所有试件RPC应变滞后均消除，RPC和型钢具有良好的共同工作性能。H形截面柱失效模式表现为RPC横向受拉断裂，而方形截面柱表现为腹板RPC剪压破坏。型钢翼缘增厚3 mm后，试件开裂位移提升了8.55%，承载力增大了3.54%，延性增大了1.8%。初应力比增大对试件承载力的影响不大 ...
卜良桃, 刘娟
doaj
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
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