Results 31 to 40 of about 14,304 (132)
Jianzhu Gangjiegou Jinzhan, 2021 为研究某车身焊装车间钢结构生产平台吊点相关的动力特性,首先采用有限元法,建立其梁壳单元模型进行模态分析。其次,进行工作状态下的模态试验,运用功率谱法完成结构模态参数识别;经对比,计算和试验模态分析结果一致性较好,有限元模型精度较高。最后,为提升钢结构生产平台中吊点结构的低阶固有频率,采用改进的非支配排序遗传算法以结构质量和第1阶固有频率为目标函数进行多目标优化;优化后,第1阶固有频率上升114%,而质量仅增加0.6%,满足工程抗震要求。
高云凯, 马超, 段少东, 申振宇
doaj
Conservation Biology, EarlyView.Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
Gaoya dianqi, 2011 针对输电线导线舞动状态评估具有模糊性和随机性的特点,分析了影响输电线舞动状态的因素,根据已有的研究成果和专家经验,从输电线舞动状态评估的需要以及实际可操作性出发,选择适当的指标来尽量全面、准确地评估导线舞动状态,提出了基于模糊理论的输电线舞动状态综合评判,建立了包含导线舞动振幅、舞动频率、风参数、覆冰厚度等因素的评估指标体系。首先应用模糊层次分析法确定各指标的常权,然后引入基于均衡函数的变权模式,对常权进行修正得到变权;各因素数值进行归一化处理后,选取了不同的模糊函数分布来确定各指标的隶属度函数 ...
王峰 +4 more
doaj
Harnessing social media data to track species range shifts
Conservation Biology, EarlyView.Abstract Biodiversity monitoring programs and citizen science data remain heavily biased toward the Global North. Especially in megadiverse countries with limited biodiversity records, incorporating social media data can help address existing data gaps.
Shawan Chowdhury +15 more
wiley +1 more source
Learner‐Focused Strategy Instruction From the Teachers’ and the Learners’ Perspective
International Journal of Applied Linguistics, EarlyView.ABSTRACT Numerous large‐scale quantitative studies have been conducted to yield a macro‐level picture of the effectiveness of strategy instruction. However, little is understood about learners' actual processing of strategy instruction and interaction with the teachers delivering it.
Isobel Kai‐Hui Wang, Andrew D. Cohen
wiley +1 more source
Gaoya dianqi, 2016 文中基于某轨道交通直流断路器的总体结构模型,设计了一种快速电磁操动机构,对其结构和工作原理进行了阐述。基于电磁场分析理论,利用有限元分析软件ANSYS对电磁机构的静态特性进行了仿真分析,得出了在合闸状态下磁场分布和动铁心所受电磁吸力情况,并对其影响因素进行了分析。然后对电磁操动机构在不同电流条件下的电磁吸力随气隙变化进行了仿真分析,得出了机构空载条件下的动态输出插值数据。最后建立直流断路器动力学分析模型,借助动力学分析软件ADAMS,将建立的动态离散数据导入其中,对直流断路器动态分合特性进行了仿真 ...
王海燕 +5 more
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study investigates how the learner‐related factors of language dominance, encompassing language history, proficiency, use, and attitude, modulate congruency effects in multi‐word unit (MWU) processing among early bilinguals. Seventy Cantonese–Putonghua bilinguals completed lexical decision tasks measuring reaction time and accuracy for ...
Mingjia Cai, Yuan Liang
wiley +1 more source
Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
wiley +1 more source
A new reservoir simulation approach for fractured gas-condensate reservoirs
Petroleum Exploration and Development, 2010 To correctly simulate and predict the performance of fractured gas condensate reservoirs, based on the previous related studies, a new numerical dual porosity compositional simulation approach, suitable for fractured gas-condensate reservoirs, is ...
Li Yong +4 more
doaj +1 more source
Unveiling the multidimensional nature of policy acceptability: A cross‐national approach
Policy Studies Journal, EarlyView.Abstract Research on mass attitudes toward public policy often centers on preferences, yet the understudied facet of policy acceptability remains pivotal. This study develops and validates a nuanced measure of acceptability that identifies three dimensions: political, affective, and deliberative.
Matthew Jenkins, Daniel Gomez
wiley +1 more source