Results 71 to 80 of about 38,634 (210)

Preparation of PANI Composite Anti-corrosion Agents and Performance Study of Epoxy Coatings [PDF]

open access: yes, 2016
金属的腐蚀是自然界常见的现象,也会给人类的生产和生活带来极大的损失。故而采取有效的措施防护金属腐蚀十分必要。在各类金属腐蚀的保护措施中,对金属进行防腐蚀涂料的涂装是最直接、最有效的方法之一。在防腐涂料领域,添加了各种防腐蚀助剂的环氧(Epoxy)基涂料一直是最常用的种类,广泛应用于各种严重腐蚀环境中钢铁建筑物的防腐涂装中。随着技术的进步和产业的革新,防腐涂料经历了从含铅、锌类等重金属作为防锈组分,到采用偏硼酸钡等无机盐的无毒型品种,到目前引起国内外广泛关注的聚苯胺(Polyaniline,PANI ...
谢泓辉
core  

The Role of Language Dominance in Congruency Effects on Multi‐Word Unit Processing: Evidence From Early Bilinguals

open access: yesInternational 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

The fundamental material design of low thermal expansion coefficient Ni-Fe-Cr based superalloy [PDF]

open access: yes, 2016
超超临界火力发电技术有着二氧化碳排放量少、发电效率高的优点,世界各国均在大力研究该技术。下一代容量越大,参数越高(温度和压力越高)的超超临界机组会排放越少的温室气体且发电效率更高,但是服役环境的更加苛刻,也要求所用材料的性能应更加优异。 在超超临界技术火力发电所用的材料中,镍基高温合金具有较高的强度以及优异的抗氧化腐蚀等性能,是其中最重要的合金之一,但其有两个不利因素:(1)热膨胀系数(CTE)较高,其与9-12%Cr的耐热钢焊接或者组装时产生较大的热应力,易造成焊接开裂或装配失效;(2)价格较高 ...
池天惠
core  

Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study

open access: yesInternational 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

Preparation andProperties of Fluorescent Gold Nanoclusters Functionalized Silk Biomaterials [PDF]

open access: yes, 2016
家蚕蚕丝作为天然的蛋白质纤维,具有独特的力学性能、良好的生物相容性和可控的生物降解性,已被作为生物医学理想材料。然而,蚕丝材料作为生物医学材料植入体内后,进行体内的检测和追踪仍是目前一大难点。本研究通过共混荧光金纳米簇和丝素蛋白,制备可用于体内荧光成像的蚕丝材料(3维支架、薄膜、凝胶),为生物材料的体内成像提供了思路。本研究主要内容如下: 冷冻干燥法制备三维多孔荧光丝素蛋白/金簇复合支架。复合支架具有红色荧光,研究发现丝素蛋白/金簇混合溶液的pH会影响金簇的荧光强度,发射峰位和荧光效率 ...
曹丽薇
core  

The Emotional Valence Paradox in Social media: A Computational Linguistic Analysis of How Sentiment, Emotion, and Content Domain Predict Social Comparisons on Rednote

open access: yesInternational 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
wiley   +1 more source

《質性研究資料分析:NVivo 8活用寶典》 Introduction: 《Qualitative Data Analysis Guidebook 》

open access: yesJournal of Curriculum Studies, 2009
質性研究資料的分析,是研究者在進行研究時最艱鉅的工作之一,若能有強大軟體的協助,將提升分析工作的效能,並減少分析時可能的疏漏。
郭玉霞Yu-Shia Guo
doaj  

Fabrication of CZTS(Se) thin films by single-target sputtering technique and their relevant application in solar cells [PDF]

open access: yes, 2016
Cu2ZnSnSxSe4-x(CZTSSe)具有合适的禁带宽度(1.5eV)和较高的光吸收系数(α>104cm-1),且元素储量丰富,是最具潜力的高效率、低成本新型绿色光伏材料之一。但是,CZTS材料组分容忍度和单晶区域很小,存在二次相和元素分解等问题,难以制备高质量的CZTS薄膜。目前,CZTS薄膜器件的最高转换效率为12.6%,远低于32%的理论效率。为了发展高效率、低成本的CZTS薄膜技术,大量的研究工作必不可少。 论文的第一部分,采用操作简便的单靶(等化学计量的Cu2ZnSnS4四元化合物靶材 ...
冯嘉
core  

Perceptions and Acceptance of Generative Artificial Intelligence Influencing Chinese EFL Learners’ Engagement in Informal Digital Learning of English: Mediating Roles of Self‐Efficacy and Motivation

open access: yesInternational 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
wiley   +1 more source

材料力学性能不均匀模式对对接接头结构性能分析的影响

open access: yesJianzhu Gangjiegou Jinzhan, 2017
经历不均匀热过程影响的对接焊接接头,呈现不均匀力学性能。在对对接焊接接头疲劳等分析过程中,应考虑不均匀力学性能。根据对接焊接接头分区和力学性能分布,提出了3种对接焊接接头不均匀力学性能分布模式:二区模式、五区模式和连续化模式。采用有限元方法分析材料力学性能不均匀模式对对接焊接结构性能分析的影响。采用3种模式结合已有试验数据,建立了不同精细化程度的有限元模型并进行有限元分析。研究结果表明:分布模式对结果会产生很大的影响,模式越精细,屈服荷载、极限荷载和屈服位移、极限位移就越小 ...
甘结良, 彭洋, 董军
doaj  

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