Results 81 to 90 of about 3,991,776 (211)
Zhongguo youzhi为了改善单螺杆挤出机混炼性能，设计了一种装配内嵌式摆线齿轮减速器和反向螺纹元件的新型螺杆。使用Solid works软件建模，利用ANSYS和CFX软件分析新型同轴变速单螺杆挤出机的流道内三维流场变化，根据流道内的压力、速度矢量、截面速度等变化，探究物料在其流道内的剪切和混合情况。结果表明：在外部情况相同时，新型螺杆建压能力弱于传统螺杆，即新型螺杆的挤出效率较低；新型螺杆因为装配内嵌式摆线齿轮减速器使其混炼区域的速度降为传统螺杆的1/6，引起物料对流，加快压力场变化，使其速度流线更加混乱 ...
左晓甜，郭树国，金子云 ZUO Xiaotian，GUO Shuguo，JIN Ziyun
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) is increasingly used to support language learning, yet little is known about how younger learners accept and engage with AI‐assisted reading. This study investigates primary school students’ acceptance of and engagement with an AI‐supported adaptive reading application for English as a Foreign Language (EFL ...
Mi Tang +5 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Collaborative writing has attracted increasing attention in English as a Foreign Language (EFL) instruction due to its potential to enhance learners’ writing competence. However, few studies have examined the comparative effects of collaborative versus independent writing on EFL learners’ individual performance, especially in higher‐order ...
Ting Huang, Chenze Wu, Wenkang Zhang
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Haiyang yu huzhao印尼贯穿流连接热带太平洋和印度洋，对区域和全球气候系统至关重要，但在印尼贯穿流的长期变化研究中非常缺乏长时间序列。利用第六次国际耦合模式比较计划历史模拟数据对卷积神经网络深度学习模型进行训练和测试，基于海表面温度反演了印尼贯穿流的体积输运。结果表明，该模型反演的印尼贯穿流可再现其总方差的80%左右。进而结合数据，首次构建了1870~2023年长达154 a的印尼贯穿流流量时间序列。通过与潜标观测数据对比发现，反演结果与国际努沙登拉层化和输运计划(the international Nusantara ...
辛 林超, 胡 石建
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International Journal of Applied Linguistics, EarlyView.ABSTRACT With the increasing number of Chinese international students in Australian universities, intercultural competence has become a critical factor influencing their interactions with Australian tutors in university classroom settings. Existing research often examines students’ intercultural competence from a single‐method or single‐perspective ...
Jiangyu Han, Linda Tsung
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Scientists in power plays: How substantive were scientists' narratives during the COVID‐19 pandemic?
Policy Studies Journal, EarlyView.Abstract Scientists who provide expert advice must engage with policy processes. Little is known about whether and how scientists deal with the political dynamics of policy processes that are inherent to policymaking. We study this question by building on the policy dimension concept within the Narrative Policy Framework.
Jule Ksinsik, Caroline Schlaufer
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, 1996 高技术探索项目学术汇报会（力学）简讯编者按《力学进展》编辑部与国家自然科学基金委员会数理科学部商定：从本期开始，《力学进展》增加科学基金栏目，介绍自然科学基金的方针、政策和管理办法，介绍基金项目的信息、动态和进行成果评介等，以沟通管理部门与学术界的联..
力学进展编辑部
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Zhongguo youzhi为改善传统单螺杆挤出机在大豆蛋白加工过程中混合性能较差的问题，基于摆线针轮传动设计了一种同轴异速单螺杆结构，以提升单螺杆挤出机的挤出品质。以传统单螺杆为参照对象，运用SolidWorks软件建立对应的几何模型，基于有限元法，运用ANSYS/CFX软件模拟大豆蛋白在流场中的运动情况，借助CFD-Post软件提取流场模拟数据，通过对比分析压力场、速度矢量场和流线场、剪切应变速率和回流系数判定同轴异速单螺杆挤出机的挤出性能。结果显示：同轴异速单螺杆挤出机建压能力是传统单螺杆挤出机的1.22倍 ...
李垚，王丽艳 LI Yao，WANG Liyan
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Policy Studies Journal, EarlyView.ABSTRACT Despite extensive research on policy diffusion, the ways in which policy attention influences this process remain underexplored. This study addressed this gap by distinguishing between three types of policy attention—political speeches, policy issuance and field visits—and investigating their differential impacts when delivered by central and ...
Xiangning Chen, Yahua Wang
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, 1993 本文介绍空间机器人运动学和动力学控制.空间机器人是由操作手和卫星本体组成,在微小重力场工作(漂浮在空中),其运动学和动力学控制要比地面机器人复杂且有其特点,本文则主要综述它与地面机器人的不同之处及其研究成果 ...
许大中, 王成恩, 郭吉丰
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