Results 61 to 70 of about 742,946 (271)
Zhejiang Daxue xuebao. Lixue ban, 2013 针对道路提取的同物异谱和同谱异物难题，提出了 一种基于邻域总变分和边缘检测的遥感影像道路提取方法，先对原始影像进行邻域总变分分割，提取出影像中具有均匀材质的地物，并采用Canny边缘检测方法获得原始影像的边缘数据；然后将边缘数据和分割结果融合，使均匀材质区域中的非道路地物和道路分离；最后采用多方向结构进一步提取狭长并具有一定宽度的道路.实验证明本文提出的道路提取方案能同时提取影像中光谱略有差异的道路，能有效剔除和道路黏连在一起的同谱异物地物，并能提取具有一定弯度的道路.
LAOXiao-min(劳小敏) +5 more
doaj +1 more source
Ibis, EarlyView.Anthropogenic factors such as artificial lighting at night (ALAN) and natural factors including temperature and moonlight can affect the dawn chorus pattern in birds. However, most studies are conducted in temperate regions. We investigated the effect of anthropogenic and natural factors on dawn chorus timing in eight species of bird across Hong Kong ...
Ann W. Y. To, Sarah A. Collins
wiley +1 more source
四川大学学报. 自然科学版, 2004 以银杏叶为原料 ,研究了微波技术在银杏黄酮浸提中的应用 .实验通过改变溶剂浓度、提取时间、料液比等条件对产品提取得率的影响进行了探讨 ,并比较了传统浸提法、微波法、微波结合浸提法三种方法的提取 ,结果表明微波法提取银杏黄酮是一种快速、高效、节能的新型提取方法 ,具有一定的实用价值 .
曾里, 刘世贵
doaj
, 2014 本发明涉及一种可保持蛋白质活性的蛋白质顺序提取方法的建立及其在鹿茸活性蛋白质提取过程中的应用。基于多种溶剂提取可以获得更高提取效率及提取覆盖广度这一原理，选择四种生物相容性良好的提取溶剂；首先应用盐溶液提取水溶性蛋白质，匀浆液经离心后获得上清液作为组分1；然后应用酸性溶液提取残渣中碱性蛋白质，离心后得到上清液作为组分2；继续应用碱性溶液和丁醇水溶液依次对残渣进行提取，分别获得组分3和组分4。本发明的优点为：相对于单一溶剂提取法，本方法可以大大提高提取覆盖广度，同时可保持各提取组分中的蛋白质的活性。此外 ...
随志刚, 张玉奎, 张丽华
core
A Systematic Scoping Review of Self‐Regulated Learning With AI in Language Education
International Journal of Applied Linguistics, EarlyView.ABSTRACT The rapid development of artificial intelligence (AI) technology has brought new opportunities for second/foreign language (L2) education while also raising concerns about the use of AI tools. This systematic scoping review provides a snapshot of the current state of research situated at the intersection of self‐regulated learning (SRL) and AI
Zheng Zhang, Sihan Zhou, Barry Bai
wiley +1 more source
, 2008 浊点萃取是近年来出现的一种新兴的液-液萃取技术，它不使用挥发性有机溶剂，不影响环境。它以中性表面活性剂胶束水溶液的增溶性和浊点现象为基础，通过改变实验参数引发相分离，将疏水性物质与亲水性物质分离。作为一种分离富集的手段，浊点萃取具有萃取效率高、富集因子大、操作简便、安全、经济、便于实现联用等优点，越来越受到人们的关注和重视。本文在详细考察了非离子表面活性剂胶团溶液相行为的基础上，建立了以浊点萃取法为分离富集手段测定中草药有效成份的含量，并且通过微波辅助提取建立了分离纯化中草药有效成分的新方法 ...
孙晨
core
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
, 2006 为解决龙眼（Dimocarpus Longan Lour）资源浪费，深加工技术水平低等问题，实现龙眼资源综合利用，进行了龙眼多糖、色素的超声强化提取及纯化研究。本文分析了超声提取和神经网络模型的机理，系统研究了影响超声提取龙眼多糖和色素各个因素；同时利用神经网络和单因素试验对提取条件进行了优化，并进行了小规模放大试验。粗多糖和色素经层析分离后，分别得到了纯度和色价较高的纯品。 本文首次系统对超声波功率、作用时间、液固比、温度等影响超声提取龙眼多糖和色素的因素进行了研究 ...
王统一
core
International Journal of Applied Linguistics, EarlyView.ABSTRACT This article examines the language life of young Malaysian Chinese immigrants in Australia and their construction of multi‐membership as reflected in their daily language behaviors. It develops the concept of everyday linguistic citizenship and uses this concept as a theoretical lens to understand how the young adults build, maintain, and ...
Xiaoyi Zhang +2 more
wiley +1 more source