Results 41 to 50 of about 19,407 (163)
Shuitu Baochi Xuebao, 2006 利用连续3年土壤水分定位观测数据，研究了红壤坡地不同利用方式下土壤水分的时空动态变化规律。结果表明：土壤水分时空动态变化主要受降雨和植被类型的影响。土壤水分季节变化分为相对稳定期、消耗期和补给期三个时段；土壤剖面（0～90cm）水分含量从表层到深层表现为增长型，依据2003年土壤水分标准差和变异系数。将土壤剖面划分为活跃层、次活跃层和相对稳定层3个层次；土壤剖面水分变异系数随降雨量和土层深度的增加而减小，随植被根系的增长而变大。平水年，深根系区与浅根系区土壤水分变化差异表现在30cm深度以下 ...
王晓燕 +3 more
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
Gaoya dianqi, 2018 套管是电力变压器的重要附件,其安全稳定运行至关重要。为此,常采用在线监测技术对其运行状态进行实时监测。在电网内部,变压器套管在线监测系统已有一定应用。然而,监测数据不仅取决于套管自身绝缘性能,而且受温度、湿度和系统运行电压等环境因素影响,且当前各套管监测厂家推荐的预警策略各异,难以满足应用要求。因此研究适宜的在线监测预警策略至关重要;文中对广东电网在运变压器套管的介损值历史监测数据进行了统计分析。研究发现变压器套管在线监测应用过程中会出现短时性、间歇性的数据异常,异常率接近1%,导致监测系统告警 ...
夏健 +7 more
doaj
Shuitu Baochi Xuebao, 2021 为减小染色法测量坡面水流流速的误差，提高染色法测量准确度，根据染色示踪剂在水中扩散引起颜色发生变化的特性，结合漫反射型模拟量光电颜色传感器和数据采集卡采集信号，通过小波变换对信号进行去噪，研发一种基于光电传感技术的薄层水流流速测量系统。以流量法为参照，确定该系统传感器最优数据采集距离为0.6~0.8 m；传感器数据采集距离为0.7 m时，该系统测量数据最小相对误差仅为0.48 ...
白凯强 +7 more
doaj
A study of elasticity deformation of polymethylene chain(聚亚甲基链的弹性形变研究)
Zhejiang Daxue xuebao. Lixue ban, 2001 本文采用旋转异构态模型，对聚亚甲基链受到无相变的弹性形变后的热力学性质进行研究，计算出在不同形变时聚亚甲基链体系的自由能、内能等热力学函数，同时还分析了应力与弹性形变的关系以及内能对弹性形变的贡献.
JIANGZhou-ting(姜舟婷) +2 more
doaj +1 more source
Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International 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
, 2013 既存的研究表明,财政转移支付放大而非缩小了省际间的财力分布差距。本文考察了转移支付对省内县际财力分布的影响,获得了两个主要发现。第一,转移支付对各省省内财力的县际分布产生了减小差距的积极影响,转移支付是唯一能够平衡财力县际分布的因素。第二,我国的省内财力县际分布不均衡水平、转移支付的均等化作用因省而异 ...
张光
core
Analysis and evaluation of fruit traits of 106 white-flesh loquat germplasm resources [PDF]
[Objective] The study aimed to provide basis for efficient exploration and utilization of excellent white-flesh loquat [Eriobotrya japonica (Thunb.) Lindl.] resources as well as parent selection for breeding new variety through the investigation of ...
CHEN Xiuping +4 more
core +1 more source
Coalition Opportunity Structures and Advocacy Coordination in Consensus and Majoritarian Democracies
Policy Studies Journal, EarlyView.ABSTRACT Research on advocacy coalitions suggests that belief homophily—the tendency of actors to coordinate based on shared policy beliefs—drives coalition formation. However, coalition opportunity structures, which are shaped by institutional contexts, may influence the extent to which belief homophily matters.
Keiichi Satoh +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 2016 通过室内模拟降雨试验，研究坡度与地表糙度对土壤侵蚀的影响。根据研究区坡耕地特点，试验共设计5个坡度，分别为9°，12°，15°，20°，25°，设计雨强为1.0 mm/min，降雨历时为60 min。结果表明：5个坡度下坡面径流总量表现为先增大后减少，在20°与25°坡面表现出显著性差异，地表糙度变异率降幅为12°＞9°＞25°＞15°＞20°；（2）次降雨产流量与坡度、糙度变异变率呈显著指数函数关系；（3）5个坡度其坡面产沙量表现为先增大后减少，产沙量在坡面梯度为3°的坡面之间以及20°与25 ...
王 添 +7 more
doaj