Results 41 to 50 of about 29,838 (168)
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
Zhongguo youzhi, 2022 蛋黄卵磷脂样品经微波消解，采用电感耦合等离子体质谱法测定样品中15种金属元素含量，对检测条件进行了优化，并进行了方法学考察。结果表明，在射频功率1.55 kW、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、重复次数 3 次条件下，通过在线加入内标钪(Sc)、锗(Ge)、铟(In)、铼(Re)元素可校正基体效应和干扰，测定汞元素时，加入金元素可降低测定误差；该方法的15 种金属元素线性关系良好，线性相关系数（R）均大于0 ...
陈秋玲，祝芷琦，李咏华，王小妹，梁北梅，温恺嘉，许一靖，曾还雄，林元亨，唐顺之 CHEN Qiuling, ZHU Zhiqi, LI Yonghua,WANG Xiaomei,LIANG Beimei, WEN Kaijia,XU Yijing,ZENG Huanxiong,LIN Yuanheng,TANG Shunzhi
doaj +1 more source
Risks of concealing environmental degradation
Conservation Biology, EarlyView.Abstract Current practice seeks to conceal the visual impact of land‐use change (i.e., development). Six percent of development impact assessments in Australia and 14% of the World Bank's assessments recommend visual impact mitigation. This mitigation results in, for example, vegetated buffer strips alongside cleared agricultural areas and earthen ...
Matt W. Hayward +8 more
wiley +1 more source
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
doaj +1 more source
Study on Extraction and Thermal Stability of Conjugated Linoleic Acid from Sheep Waist Fat(羊腰部脂肪中共轭亚油酸提取及热稳定性) [PDF]
Shipin kexue jishu xuebao, 2013 The sheep waist was chosen as raw material for grease extraction in this paper. The effect of different solvents,and temperature on extraction of grease and conjugated linoleic acid-CLA- was studied.
HOU Jian-jun(侯建军) +4 more
doaj +1 more source
Institutional lessons from the Nordic management model
Conservation Biology, EarlyView.Abstract To improve wildlife management outcomes, in terms of reaching management goals and increasing legitimacy, Nordic countries have developed institutional systems involving stakeholders that aim for a more inclusive and participatory model.
Jens Nilsson +2 more
wiley +1 more source
Æ E Æ Å – Reshaping the Role of Træna Fishermen
, 2022 This diploma project aims to strengthen the viability of Træna’s community by proposing an ocean research facility in the archipelago, enabling the next generation of local fishermen to collect oceanographic data while working at sea. The idea of the fisherman as oceanographer is inextricably linked to the architectural program on the island of ...
openaire +1 more source
Conservation Biology, EarlyView.Abstract Ecological niche models (ENMs) are used to assess the abiotic preferences of species by linking their occurrences to the environmental conditions in which they live. We developed a fossil‐informed ENM framework that integrates mid‐Holocene and modern occurrences to test niche stability and reconstruct abiotic niche characteristics for four ...
Claire. M. Williams +3 more
wiley +1 more source
四川大学学报. 自然科学版, 2007 本文对手写体数字的特征提取方法进行了讨论,分析了当前使用较多的三种特征提取方法,指出了各自的优缺点,并在此基础上提出了一种新的特征提取方案,即13点特征提取方法,该方法从每个字符中提取关键的13个点作为特征点,其主要特点是特征提取简单有效,节省了特征提取时间,提高了识别系统的运行速度.用同一种网络对特征提取后的结果进行训练和识别.仿真结果表明,13点特征提取法用于手写体数字的识别有着极好的适应性,在运行速度和识别率上比起其它算法都有很大的提高,从而极大地证实了新算法的有效性及实用性.
钟乐海, 胡伟
doaj
Conservation Biology, EarlyView.Abstract Reversing ongoing biodiversity loss requires effectively managing anthropogenic threats. Although conservation actions can mitigate these threats, prioritizing and targeting such actions remain challenging because species respond differently depending on the nature of the threats and their biological traits.
Camila Guerrero‐Pineda +3 more
wiley +1 more source