Results 31 to 40 of about 137,651 (153)

A Latent Profile Analysis of Chinese EFL Students’ Speaking Self‐Efficacy: The Role of Gender in Predicting Profile Membership and the Association of Profiles With Speaking Proficiency

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT Understanding learners’ English speaking self‐efficacy is essential for promoting effective oral communication in EFL contexts. However, variable‐centered research on English speaking self‐efficacy often overlooks heterogeneity among learners.
Cha Li, Lawrence Jun Zhang
wiley   +1 more source

固体损伤的演化诱致突变和预测

open access: yes, 2012
编者按:力学研究所以白以龙院士为首的研究团队多年来对演化诱致灾变问题进行了系统而深入的探讨,先后发表过一系列研究成果,例如:《材料的不稳定性》(1995),《固体的破坏》(1998),《固体损伤的演化诱致突变和预测》(1999),《内禀Deborah数在破坏现象中的意义》(2004)和《细观强度非均匀性导致的破坏的非通常行为》(2009),等等。这些研究深入分析了材料损伤破坏的机制,并对自然灾害(如地震)和重大工程安全(如水坝)的预测预报具有重要意义。征得白以龙院士的同意,本刊在此选登 ...
白以龙, 柯孚久, 夏蒙棼
core   +2 more sources

AI foundation models in plant biology

open access: yesNew Phytologist, EarlyView.
Foundation models decode genomes, engineer proteins, phenotype crops, and drive AI agents across plant biology. This figure was created in BioRender (BioRender.com/xcmmkel). Summary Rapid technological progress has enabled plant biologists to accumulate unprecedented volumes of multi‐scale, multi‐modal data, yet this abundance of data has intensified ...
Haopeng Yu
wiley   +1 more source

基于历史数据纵向匹配的光伏功率预测方法研究

open access: yesGaoya dianqi, 2017
针对现有光伏功率预测系统存在预测误差大的问题,文中结合实际工程经验,提出一种基于历史数据纵向匹配的功率预测方法。通过对电站历史数据进行预处理,排除失真数据,以时间和气象预测数据为条件对历史数据进行纵向查询,纵向匹配出预测日的光辐射系数曲线、功率输出综合系数曲线,实现对未来几小时或几天的功率预测。仿真实验与电站实际应用表明:该方法预测误差小,简单实用,有实际推广意义。
贺衬心   +4 more
doaj  

Navigating the Algorithmic State: Public Values and Citizens' Preferences of AI‐Driven Public Service Delivery

open access: yesPublic Administration, EarlyView.
ABSTRACT As the public sector increasingly adopts AI‐powered automated decision systems (ADS), understanding how citizens experience and value ADS use in public decision‐making is both normatively and practically important. Therefore, we examine and compare the effects of seven attributes of public values on citizens' support for ADS adoption in two ...
Guimin Zheng   +4 more
wiley   +1 more source

两种马尔科夫链菜单预测模型建模

open access: yes四川大学学报. 自然科学版, 2013
软件复杂度的增加,导致菜单项数的激增,从而导致菜单交互过程中视觉搜索时间的增加和认知负荷的加重.论文研究了基于绝对分部的马尔科夫链预测模型(ADMCP)和多阶叠加的马尔科夫链预测模型(SPMCP),在不同Top-N下,对下一个可能选取的菜单项进行预测的预测能力.实验结果表明,ADMCP适用于预测项数Top-N大于5时的菜单项预测,而PSMCP适用于Top-N小于等于5时的菜单项预测.
陈渝, 谢天添, 林涛, 琚生根
doaj  

There Is Always a Bigger Fish. Determinants of Power Perceptions in Swiss Biodiversity Policy

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT The Advocacy Coalition Framework (ACF) views power as crucial in policy processes, but the nature of coalition power, its determinants, and how to empirically measure it remain understudied. In this article, we use a mixed method approach and social network analysis to explore power relationships in the biodiversity policy subsystem in ...
Alix d'Agostino   +2 more
wiley   +1 more source

加权零阶局域法在网络舆论趋势预测中的应用

open access: yes四川大学学报. 自然科学版, 2010
采集了某一时段国内某著名网站上针对某一指定话题的帖子,按时间周期构造了一个关于新增帖子数量的时间序列,利用混沌时间序列预测方法中的加权零阶局域预测法预测了该序列的变化趋势.仿真结果表明该预测趋势与实际趋势在短期内是基本一致的;短期预测误差明显小于长期预测误差.
胡朝浪   +4 more
doaj  

基于ARMA模型的GIS局部放电发展趋势预测

open access: yesGaoya dianqi, 2020
气体绝缘组合电器(gas insulated switchgear,GIS)设备局部放电存在安全隐患,不容忽视。文中采用特高频法研究GIS中典型局部放电过程,建立局部放电缺陷模型,进行大量试验获得数据。提取数据得到局部放电特征量,并采用局部放电特征谱图研究局部放电的特征。对特征量进行筛选、分类,选取不同类型特征量代入自回归移动平均模型中对GIS局部放电发展趋势的预测情况进行分析研究。结果表明:①对于局部放电线性参量,ARMA预测模型可以对其发展趋势进行准确预测,整体预测误差值均在10%以下 ...
何金   +7 more
doaj  

基于EMD和GCT的变压器油中溶解气体预测

open access: yesGaoya dianqi, 2022
针对传统预测方法在变压器油中溶解气体预测时精度不高的问题,提出一种EMD和GCT联合应用的新型预测方法。首先使用EMD将溶解气体浓度、环境温度、油温及负载电流等时序信息分解成平稳的模态分量;然后使用GCT分析模态之间的预测关系,提取每阶模态的格兰杰原因;最后将待预测分量及其格兰杰原因所对应的历史时序输入到时间注意力机制LSTM网络进行预测,并采用改进的蚁狮算法优化网络参数,经叠加重构得到特征气体浓度最终预测结果。实验结果表明:与传统LSTM网络相比,所提方法具有更高的预测精度和可行性。
陈铁   +4 more
doaj  

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