Results 31 to 40 of about 24,432 (139)
Gaoya dianqi, 2022 针对网内发生的一起罐式断路器故障，文中通过对断路器故障情况及回路电阻、机械特性、X射线数字成像检测等试验情况进行分析，判断故障的原因为静主触头触指存在弯曲异常导致合闸后接触不良。解体分析确定故障根本原因是多次操作后断路器静主触头与动主触头出现对中不良的问题，对中不良引起动主触头与静主触头产生碰撞，导致静主触头部分触指向内弯曲，最终因接触不良造成罐式断路器发生外壳烧穿等故障。为消除隐患，最后文中从产品结构、工艺控制两方面对设备故障的原因进行了深入分析，提出了相应的实用改进措施，避免类似故障再次发生。
王贵山, 李应宏, 房博一
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Previous research has established the relationships between motivation, anxiety, teachers’ support, and self‐regulated learning (SRL) in English‐as‐a‐foreign‐language (EFL) learning. Most of the studies, however, have taken a variable‐centered approach in addressing the variable correlations, while learners’ characteristics and variable links ...
Yuhong Jiao, Barry Bai, Jing Li
wiley +1 more source
International Journal of Applied Linguistics, EarlyView.ABSTRACT Online tutoring platforms (OTPs) are an increasingly popular way for learners to study languages and for teachers to earn money. On many OTPs, individual teachers are responsible for attracting potential students via self‐branding. While scholarship has examined OTP teachers’ self‐branding practices and identified some of the most popular self‐
Wenjing Zeng, Nate Ming Curran
wiley +1 more source
野生动物学报, 1997 本文通过粪便分析对甘肃兴隆山保护区食肉兽的食性及与马麝的关系进行了初步研究．粪便直径分析表明，该地区食肉兽主要为狐和豹猫．粪便内含物分析结果表明，啮齿类和鸟类出现的频率分别为８１．６％～８８．４％和２１．１％～３８．６％，马麝成体在４～５月很高（１７．６％），幼麝在出生期高达２１．１％．分析认为兴隆山食肉兽对马麝的捕食主要在马麝的幼仔期．
高志千, 康发功
doaj
Zhejiang Daxue xuebao. Lixue ban, 2017 2015年1~12月在温州市区采集448个PM2.5样品，采用离子色谱法分析PM2.5中9种水溶性离子(、Cl-、Na+、K+、Ca2+、Mg2+和F-）的浓度，研究其污染特征、化学组分和来源.采样期间9种水溶性离子总浓度为39.97 µg • m-3，和占所测水溶性离子总量的(40.19±10.04)%.离子总浓度的季节变化特征为冬季>春季>秋季>夏季，从空间分布上看，多数季节市站采样点PM2.5中离子总浓度低于南浦、龙湾和瓯海采样点.相关性分析结果显示，PM2.5值与、Ca2+、Na+、K+、Cl-、
GELinlin(葛琳琳) +7 more
doaj +1 more source
Attainment Pairing Effects on Cognitive Conflict in Technology‐enhanced EFL Cooperative Tasks
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study examines how attainment pairing (high‐high versus high‐low versus low‐low attainment) impacts English as a Foreign Language (EFL) learner engagement during technology‐enhanced cooperative writing tasks. Seventy‐eight Chinese university learners formed 39 dyads (13 pairs per group) via Tencent Meeting.
Ying Liu, Allen Thurston
wiley +1 more source
Shuitu Baochi Xuebao, 2020 以陇西县600份土壤全氮含量数据为基础，应用地统计学研究陇西县土壤氮素的空间分布特征并计算了该区域的氮储量，采用相关性分析、主成分分析等方法探讨了影响全氮空间分布的影响因素。结果表明，陇西县土壤全氮含量为（0.734±0.306） g/kg，变异系数属于中等程度变异；氮密度平均值为0.091 kg/m2，氮储量为7.6×106 kg，其中0—10，10—30，30—50 cm土层氮储量分别占到0—50 cm土层氮储量的35.97%，7.06%，56.97%。陇西县土壤全氮含量及氮储量空间分布相似 ...
任建新 +4 more
doaj
Zhejiang Daxue xuebao. Lixue ban, 2016 为在方案设计初期与工程造价相关信息很少的条件下，准确快速地预测住宅工程造价，在分析既往相关理论和方法优劣的基础上，选取支持向量机构建住宅工程造价预测模型，并通过主成分分析对原始数据进行降噪处理.选取住宅工程造价预测指标集与样本，对输入指标的数据进行主成分分析，消除指标相关性的同时对原始数据降维，将处理后的数据分别导入到“标准支持向量机”和“最小二乘支持向量机”模型中进行训练和预测，并对预测结果进行对比分析，选取较为合理的预测模型，通过参数寻优进一步优化预测效果.所构建预测模型的相对误差均控制在±7%以内，
QINZhongfu(秦中伏) +3 more
doaj +1 more source
International Journal of Applied Linguistics, EarlyView.ABSTRACT Although the use of AI technologies (e.g., chatbots and automated writing evaluations (AWE)) has gained considerable attention in language learning fields in recent years, how AI technologies have been designed and implemented in language learning education, as well as their effectiveness, is understudied.
Shen Qiao +2 more
wiley +1 more source
Shuitu Baochi Xuebao, 2016 对黄河三角洲贝壳堤岛贝壳砂基质和相邻滨海盐土的盐分特征进行调查研究，系统分析贝壳堤岛土壤盐分的空间异质性。选择不同地下水埋深梯度下2种土壤类型进行剖面盐分特征测定，比较研究土壤类型及地下水埋深对土壤盐分特征的影响，并应用主成分分析法对土壤盐分特征进行综合评价。结果表明：（1）除Ca2+外，贝壳砂基质剖面中其余盐分特征指标由表层至底层均呈现逐渐增高的趋势，Ca2+含量由上至下则呈现缓慢降低的趋势；（2）贝壳砂基质剖面盐分含量与地下水埋深密切相关，近海侧剖面(地下水埋深1.5 m)细颗粒含量、含水量 ...
董林水
doaj