Results 31 to 40 of about 52,467 (200)
基于随机森林模型提取干旱区人工绿洲耕地 -以阿拉尔绿洲区为例
生态环境与保护, 2020 本文以干旱区阿拉尔2013年-2018年的Landsat8为主要数据来源,基于随机森林模型对干旱区绿洲植被信息进行提取。结果表明：总体分类精度为87%,满足干旱区绿洲提取要求。随机森林模型可以很好地提取干旱区绿洲植被,为干旱区提取绿洲植被提供了依据。
静 王
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When and why to give shorebirds a head start
Conservation Biology, EarlyView.Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson +4 more
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Zhongguo youzhi旨在促进葵花籽饼的高值化利用，采用低共熔溶剂（DES）提取葵花籽饼中绿原酸和总黄酮。以60%乙醇提取法为对照，绿原酸和总黄酮得率为评价指标，先从11种DES中确定最佳提取溶剂，在此基础上进一步考察提取时间、料液比、提取温度、DES含水量对绿原酸和总黄酮提取效果的影响，从而确定绿原酸和总黄酮的最优提取工艺。结果表明：综合考虑提取效果和成本，确定氯化胆碱-乳酸（物质的量比1∶ 2）为最佳提取溶剂；绿原酸的最优提取工艺条件为提取时间60 min、提取温度70 ℃、料液比1∶ 30和DES含水量30 ...
李志成，任曼曼，刘伟，梁少华，杨瑞楠，孙聪LI Zhicheng, REN Manman, LIU Wei, LIANG Shaohua, YANG Ruinan, SUN Cong
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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
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Design and Research of Production Line of Continuous Cyclic Ultrasonic Extraction(连续循环超声波提取生产线的设计和研究) [PDF]
Shipin kexue jishu xuebao, 2014 The equipment structure and characteristics of ultrasonic extraction circulation were intro-duced based on the advantages and disadvantages of domestic ultrasonic extraction equipment.
LIU Yude(刘玉德) +4 more
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Zhongguo youzhi, 2023 旨在为大豆油（供注射用）的质量控制及安全评价提供参考，建立了微波消解-电感耦合等离子体质谱( ICP-MS)法测定大豆油（供注射用）中金属元素含量。将0.5 g大豆油（供注射用）加硝酸溶解后，先在100 ℃预消解1 h,再采用微波消解仪进行前处理，通过ICP-MS法在射频功率1 550 W、载气（高纯氩气）流速1.03 L/min、等离子气体流速15.0 L/min、蠕动泵转速0.1 r/s、采样深度10 mm条件下测定14种金属元素含量。应用四极杆碰撞/反应池技术消除多原子离子对待测元素的干扰，以钪 ...
陈秋玲，李咏华，王小妹，许文东，林元亨，祝芷琦，梁北梅，温恺嘉，许一靖，唐顺之CHEN Qiuling, LI Yonghua,WANG Xiaomei, XU Wendong, LIN Yuanheng, ZHU Zhiqi, LIANG Beimei, WEN Kaijia, XU Yijing, TANG Shunzhi
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Evaluating past and future contributions of conservation programs to species recovery
Conservation Biology, EarlyView.Abstract Impact evaluation of conservation actions is a crucial step in global efforts to curb the biodiversity crisis. Through robust impact evaluation, practitioners can assess the effectiveness of conservation strategies and optimize the use of limited resources.
Rebeca E. Young +10 more
wiley +1 more source
测绘与勘探, 2020 对于地理国情监测变化信息来说，其主要指的是提取矢量成果数据，从而准确地反映地理的空间变化情况，强化地理空间信息数据的应用性，从而为资源管理和地理国情数据动态更新所服务。基于此，论文主要对地理国情监测变化信息提取与质量控制进行分析。
孝永 沈
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Effects of parachute science on local research capacity 降落伞科学对当地研究能力的影响
Conservation Biology, EarlyView.Abstract Strengthening research capacity is essential to address the global biodiversity crisis. Yet, parachute science often undermines this goal, and its prevalence, costs, and benefits are unclear. We analyzed 13,502 publications on primate research that we extracted from Scopus (1960–2022) to evaluate the effects of parachute science on local ...
Li Yang +11 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2011 目的对阴道加德纳菌基因组DNA几种不同的提取方法进行比较,以利于细菌性阴道病的研究。方法采用几种不同方法提取阴道加德纳菌基因组DNA,对不同方法提取的细菌基因组DNA进行定量检测,以评价不同方法的提取效率。结果加德纳菌基因组DNA提取以改良法提取率较高,酚-氯仿抽提法、醋酸钾法次之,碱裂解煮沸法和溶菌酶煮沸法提取效率较差,加热煮沸法提取效率低。结论改良法提取GV基因组DNA效率较好,适用于临床应用。
姚虹, 吕治, 苏建荣
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