Results 21 to 30 of about 30,773 (189)
Applying Statistical Methods to Develop a Better Vocabulary List [PDF]
, 2007 これまでに数多くの学習語彙表が開発されているが，より良い語彙表を作るために，既存の語彙表における情報を統計的手法によって統合しているような研究はほとんどない。本研究では，基礎語の抽出のために，いくつかの語彙表などにおける語彙の特徴指標を統合し，より良い学習語彙表を開発するための統計的手法の検討を行うことを目的とした。まず，中学校主要英語教科書をコーパス化したものの頻度を基にした語彙表を作成し，いくつかの既存の語彙表や語に対する親密度，語の長さなどを語の特徴指標とし ...
Mizumoto Atsushi, 水本 篤
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Rare Metals, EarlyView.ABSTRACT Internal oxidation has been identified as an effective method for enhancing the strength of AgMg alloys. However, the concurrent occurrence of embrittlement remains inadequately understood, thus limiting their broader application. This study investigates the oxidation behavior of AgMg alloys with Mg concentrations ranging from 1 at% to 7 at ...
Hai‐Cheng Zhu +12 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Chlorination roasting has emerged as a promising pyrometallurgical strategy for the selective recovery of lithium from spent lithium‐ion batteries (LIBs). In this study, a natural roasting agent, seawater‐derived chlorides, was employed to selectively extract lithium from spent LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode. MgCl2·6H2O, a main component
Bei‐Lei Zhang +7 more
wiley +1 more source
Gaoya dianqi, 2018 为了进一步提高基于油中溶解气分析的变压器故障诊断准确率,提出了一种基于模糊聚类和主成分分析的故障诊断方法。该方法首先利用模糊C均值聚类方法对搜集的DGA样本集进行聚类分析,将聚类中心矩阵作为标准故障谱。然后采用改进型主成分分析方法精简样本矩阵信息,通过计算样本主成分间欧拉距离确定故障类型。通过实例验证证明本文方法能有效识别故障类型,且较IEC比值法、改良三比值法等具有更高的准确率。该方法为变压器故障诊断提供了新思路,具有一定的实际应用价值。
覃煜, 黄慧红, 方健, 陈雁
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Nonlinear predictions in regression models based on kernel method [PDF]
, 2009 Thesis (Ph. D. in Engineering)--University of Tsukuba, (A), no. 5170, 2009.7.24Includes bibliographical references (p.
Wibowo Antoni
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Rare Metals, EarlyView.ABSTRACT A major challenge in fabricating eutectic NiTiNb alloys is the incomplete melting of Nb due to its much higher melting point than the NiTi matrix. In this work, a novel electron‐beam freeform additive manufacturing strategy is developed to eliminate unmelted Nb particles and achieve a fully eutectic structure through independent dual‐wire ...
Qing‐Da Zhang +9 more
wiley +1 more source
Shuitu 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
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Rare Metals, EarlyView.ABSTRACT The high accuracy in surface‐enhanced Raman scattering‐lateral flow immunoassays (SERS–LFIAs) is critical for reliable point‐of‐care testing (POCT) in clinical diagnostics. Conventional approaches are often affected by sampling variability and uneven distribution of immunoprobes, leading to unreliable signal fluctuations.
Shuai Zhao +9 more
wiley +1 more source
Jianzhu 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
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Dianci bileiqi, 2020 目前缺少有效的线路复合绝缘子综合评价方法,无法准确判断绝缘子运行状态,严重影响线路安全稳定运行。笔者基于主成分分析法建立了线路复合绝缘子运行状态综合评价模型,其中制定了实验参数的无量纲处理原则并选取累计方差达到85%的指标参数作为主成分。以±800 k V楚穗直流线路复合绝缘子为例,选取15支在线运行绝缘子进行了基本性能测试、电气性能试验和机械性能试验,依据主成分分析法对得到的3类主成分。评价结果与绝缘子当前状态具有良好契合度,验证了线路绝缘子运行状态综合评价模型的有效性和可靠性 ...
陈艺 +4 more
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