Results 31 to 40 of about 1,703,447 (187)

一种对无统计环境测量模型缺省值进行预测的新方法

open access: yes四川大学学报. 自然科学版, 2003
采用模式识别中的K最近邻法(KNN方法)对不满足于统计模型的数据阵中的缺省值进行预测,预测以样本值作为预测参照 由于原始数据阵没有训练集,故采用对原始数据进行最大似然主成分分析(MPCA),获得的结论与KNN方法处理后的数据的主成分分析结论相比较,结果表明,两套数据分析得出的主因子数、因子负载阵基本一致,而因子得分阵有细微的差别 ...
李梦龙   +4 more
doaj  

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

统计模式识别在水质分类和水处理剂配方推荐中的应用

open access: yesGongye shui chuli, 2006
简述了统计模式识别方法的原理及其在循环冷却水处理中的应用。运用主成分分析法和因子分析法,对20种不同水质的补充水进行了成功的聚类分析。对水处理剂配方的筛选工作具有很好的指导作用。
陈国松, 唐美华, 张之翼, 卢伟
doaj  

Making Interview Multilingualism Visible: Transnational Chinese Language Teacher Identity Construction

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT This study examines multilingual practices in research interviews, focusing on English lexical insertions in Chinese‐language research interviews with teachers of Chinese in Australian secondary schools, and treating these code‐switches as analytically meaningful rather than incidental.
Chengwen Yuan, Tianwei Zhang, Gary Bonar
wiley   +1 more source

前期降雨与不同沙源条件小流域产沙关系的对比研究

open access: yesShuitu Baochi Xuebao, 2001
为了解不同沙源条件下前期降雨对小流域产沙的贡献和作用,本文利用不同沙源条件下2个典型小流域(云南蒋家沟流域和四川遂宁玉丰小流域)以及一组篱笆减少侵蚀试验的降雨和产沙资料,选取前期降雨、过程降雨、产沙历时以及雨强因子,运用主成分分析法 ,进行对比研究,并分析了其机理.结果表明,前期降雨在玉丰小流域渐变型产沙中,首属第1主成分;但在蒋家沟突变型产沙中首属第1主成分.
李昌志 刘兴年 曹叔尤 雷孝章 黄尔
doaj  

Global Englishes Language Teaching Curriculum Innovation: Students’ Learning Experiences and Long‐Term Academic and Career Trajectories

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT Given the global spread of English and the recent challenges to English major education, it is essential to explore the potential benefits of implementing Global Englishes in a discipline‐specific context. This qualitative study explored the learning experiences of eight female English major graduates who previously attended Global Englishes ...
Xiaowen (Serina) Xie   +3 more
wiley   +1 more source

川西北高原不同野生垂穗披碱草种群穗部形态研究

open access: yes四川大学学报. 自然科学版, 2009
对分布于川西北高原的12个垂穗披碱草(Elymus nutans Griseb.)种群的15个穗部形态性状进行了研究.多样性指数分析表明,12个种群穗部形态学性状上具有丰富的遗传多样性(H′=1.868),且遗传多样性主要集中在种群内部(71.91%)大于种群间遗传变异(28.09%);聚类分析把12种群的材料聚为4类;主成分分析表明小稳宽、小穗长、外稃长、内稃长、穗长、单稳重和穗节数是造成12个种群垂稳披碱草稳部特征差异的主要因素.
张建波   +6 more
doaj  

Language Mindset and Discipline Mindset Both Matter: Exploring the Effect of Growth Mindset on Motivation and Willingness to Communicate in EMI Higher Education

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT In English medium instruction (EMI), students face cognitive and emotional demands in second language (L2) communication, which may hamper their motivation and willingness to communicate (WTC). Adopting a mixed‐methods design, this study explores how growth mindsets affected student motivation (e.g., ideal L2 self and ideal disciplinary self ...
Pengzhan Yang   +2 more
wiley   +1 more source

烟气脱硫石膏粉化学物相分析

open access: yes, 2013
介绍了燃煤发电厂产出的烟气脱硫石膏粉中的化学组分分析方法。根据烟气脱硫石膏粉的特性,采用X射线能谱(EDs)仪对样品进行半定量分析,样品经过水洗去除50%的主成分后,不溶于水的物质用X射线衍射(XRD)仪进行定性分析,根据定性和半定量的分析结果,采用电感耦合等离子体原子发射光谱(ICPAES)法、离子色谱(IC)法和重量法进行元素和组分的定量分析,综合分析结果,确定了烟气脱硫石膏粉是由82.2%CaSO4·0.5H2O,3.0%CaCO3,1.0%CaMg(CO3)2,11.1%SiO2,1.4 ...
于亮, 宋文吉, 冯自平, 黎涛
core   +1 more source

钢结构预拼装成本控制数学模型分析

open access: yesJianzhu Gangjiegou Jinzhan, 2019
钢结构预拼装是检测构件加工精度及保证结构在现场顺利安装的主要技术手段,它的实现方式主要有实体预拼装和虚拟预拼装两种。为更加有效地管控项目成本,通过建立成本控制数学模型来分析钢结构虚拟预拼装技术及钢结构实体预拼装技术在北京新机场项目中的应用,分别从钢结构预拼装技术比对、两种预拼装方案之间的成本影响因素、实际项目数据佐证、效益分析等几个方面对预拼装成本进行系统阐述。通过成本分析模型,优选拼装方案;通过对主要因子控制,进而达到更好的成本控制。
孟玲霄   +5 more
doaj  

Home - About - Disclaimer - Privacy