Results 61 to 70 of about 681,279 (194)
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
Vocabulary Strategy Instruction in the Argentine EFL Context: Teachers’ Perspectives and Practices
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite extensive research on vocabulary strategy instruction (VSI), little has been known about teachers’ perspectives on how it is understood and implemented in practice. This study investigated Argentinian EFL teachers’ priorities in vocabulary instruction, their perceived knowledge of learner strategies for spoken vocabulary, and factors ...
Isobel Kai‐Hui Wang, Andrew D. Cohen
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
Co‐Teaching in a Virtual Intensive Study Language Programme: Insights From Team Ethnography
International Journal of Applied Linguistics, EarlyView.ABSTRACT As virtual study abroad becomes an increasingly important form of international education, little is known about how transnational teaching is organised and sustained across institutions. Using activity theory as an analytical framework and team ethnography as methodology, this study examines a virtual intensive study (VIS) programme delivered
Zhu Hua +7 more
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
AI foundation models in plant biology
New Phytologist, EarlyView.Foundation models decode genomes, engineer proteins, phenotype crops, and drive AI agents across plant biology. This figure was created in BioRender (BioRender.com/xcmmkel). Summary Rapid technological progress has enabled plant biologists to accumulate unprecedented volumes of multi‐scale, multi‐modal data, yet this abundance of data has intensified ...
Haopeng Yu
wiley +1 more source
, 2013 本发明公开了一种微生物油脂提取方法，属于生物工程下游技术领域。以产油微生物发酵醪液为原料，经过酶解、有机溶剂浸提得到微生物油脂，浸提率最高可达100%。本发明不需要浓缩发酵醪液、回收菌体、干燥菌体等前处理操作，酶解条件温和，处理时间短，浸提温度低，浸提率高，对设备要求低，所用有机溶剂毒性小，大大降低了微生物油脂提取过程中动力和能量的消耗，降低了过程成本，减轻了对环境的污染和人体健康的损害 ...
靳国杰, 赵宗保, 杨帆
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Compliance in Regulatory Gray Areas: The Case of the Organic Seed Standard
Policy Studies Journal, EarlyView.ABSTRACT Adaptive regulations, designed to balance flexibility with accountability, can embed provisions that unintentionally leave room for firms to shirk on their responsibilities by exploiting flexibility. We call these provisions “regulatory gray areas,” and ask: how should we understand (non‐)compliance in adaptive regulatory settings?
Liza Wood +3 more
wiley +1 more source
, 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
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