Results 51 to 60 of about 19,831 (152)
Jianzhu Gangjiegou Jinzhan, 2020 双段消能摇摆结构体系是基于单段摇摆结构体系应用于高层建筑的发展,由两段串联的摇摆结构、主体结构、刚性连杆以及位移型阻尼器组成,可以减小高层建筑结构在地震作用下的动力响应,控制主体结构变形更加均匀,并削弱结构高阶振型的影响,提高结构的抗震性能。基于双段消能摇摆结构体系的刚度组成,建立了双自由度简化分析模型,并结合有限元分析模型进行验证。提出了影响双段消能摇摆结构体系弹性地震反应的无量纲控制参数,结合参数分析的结果,给出了无量纲控制参数的建议范围。研究表明 ...
张文津 +3 more
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Zhejiang Daxue xuebao. Lixue ban, 2008 采用湿法制备了导电聚苯胺/鳞片石墨导电复合材料.通过对其电阻、IR、SEM、DMA进行表征，以及运用层积模型对复合材料体系电学性能进行了拟合.结果表明：用偶联剂处理过的复合材料比未处理的在电阻性能上有较大改善，石墨粒子开始形成导电网络时的体积分数临界值Φc降低到1.43%. IR和DMA验证了温度升高使聚苯胺基体结构向苯-苯式转化，这一过程导致体系电阻在80 ℃之后呈下降趋势.层积模型对复合材料体系的拟合结果较好地符合了电导率与体积分数之间的线性关系.
MAYu-heng(马玉恒) +2 more
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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
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政府旅游数据开放的评价指标体系构建与组态分析：基于21个省级行政区的数据
大数据在信息时代和智慧旅游背景下，政府主动对外开放内部的旅游数据，有利于充分释放旅游数据资源的商业价值与社会价值。使用变异系数法与熵权法进行组合赋权，构建了政府旅游数据开放评价指标体系，计算21个省级行政区的具体得分，并采用模糊集定性比较方法进行高评价值与低评价值条件组态分析。结果表明：指标体系包含4项一级指标、17项二级指标与51项三级指标，可以对当前省级行政区的旅游数据开放绩效进行有效评价；利用层、数据层是权重较高的一级指标，法律政策效率与内容、平台关系等是权重较高的二级指标；高评价值组态为综合发展型 ...
胡安安, 郭梦珂, 黄丽华, 黄荔桐
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From Clueless to Confident: How ChatGPT Transforms Academic Writing in Chinese as a Second Language
International Journal of Applied Linguistics, EarlyView.ABSTRACT Generative artificial intelligence (GenAI) has demonstrated its potential to enhance the quality of second‐language (L2) academic writing. This study used a qualitative approach comprising analysis of ChatGPT usage‐history screenshots, written assignments, and semi‐structured interview data on students’ use of GenAI in their L2 Chinese ...
Lanfang Sun +4 more
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Profiling Metacognitive Knowledge and Growth Mindset in EFL Vocabulary Learning
International Journal of Applied Linguistics, EarlyView.ABSTRACT Guided by the self‐regulated learning (SRL) framework, the present study investigates the associations between metacognitive knowledge and growth mindset in EFL (English as a Foreign Language) vocabulary learning, addressing a critical gap in the literature. While metacognitive knowledge, comprising person, task, and strategy dimensions, plays
Weili (Allen) Xing, Mark Feng Teng
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野生动物学报, 2016 采用霍恩氏法测得D型肉毒梭菌毒素对青海田鼠的灌胃半数致死量LD50=5.01万MLD/kg体重,95%可信限为3.08～8.14万MLD/kg体重,表明D型肉毒灭鼠剂对青海田鼠敏感; 实验以小麦做基饵,测得青海田鼠对小麦基饵的D型肉毒灭鼠剂有选择适口性良好,摄食系数为0.92; 无选择适口性很好,摄食系数为1.15; 再遇适口性良好,摄食系数为1.15。该项试验研究为利用D型肉毒梭菌生物毒素进行大面积青海田鼠的防治提供了基础数据。
李生庆 张西云 胡国元 范玉霞 刘生财李志宁 李秀平 王亭亭 黄 荣 刘怀新
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Fushe yanjiu yu fushe gongyi xuebao通过对模式生物斑马鱼（Danio rerio，zebrafish）建立剂量学模型，得到斑马鱼对137Cs的剂量系数（DCs）及剂量率，针对核设施向环境中排放放射性核素等问题，提供有效的技术手段及数据。在实验室中采用1 000 Bq/L的137Cs水溶液饲养斑马鱼，得到斑马鱼浓集因子（CR），针对模式生物斑马鱼建立整体模型和简化解剖学模型，通过蒙特卡罗模拟得到放射性核素137Cs粒子能量在斑马鱼体内的内外照射沉积能，根据公式计算得到137Cs对斑马鱼的剂量系数及剂量率 ...
贡 文静 +7 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT This computational linguistic study analyzes 8743 Rednote posts to examine how sentiment, emotion, and content domain collectively shape social comparison dynamics on social media. We identify four key findings: (1) an emotional gradient, where upward comparison content exhibits the highest sentiment scores and downward comparison the lowest; (
Michelle Mingyue Gu +7 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Generative artificial intelligence (GenAI) has emerged as a powerful tool in the Informal Digital Learning of English (IDLE) environment, offering personalized, interactive, and innovative language learning experiences that may enhance learning engagement.
Jin Liu, Meilu Liu, Yuan Yao, Dechao Li
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