Shuitu Baochi Xuebao[目的] 坡度和坡长作为重要的地形因子,其计算的准确性直接影响坡面土壤侵蚀模型的评价精度。高分7号卫星的高精度高程测量能力在地形因子的准确提取上具有较大潜力,期望能将其利用到坡度和坡长提取之中,实现对地形的准确表达。这需要对利用高分7号卫星DEM提取坡度坡长的结果进行精度评价。[方法] 利用地形因子(LS)计算工具,对陕西省吴堡县4个小流域高分7号卫星、1∶10 000地形图、激光雷达影像生成的DEM进行坡度、坡长的提取。采用相关系数(r)、相对偏差和绝对偏差作为评价指标,评价高分7号提取地形因子的精度。
赵云龙, 符素华
doaj
[Xanthoceras sorbifolium Bunge flower extract inhibits benign prostatic hyperplasia in rats]. [PDF]
Nan Fang Yi Ke Da Xue Xue Bao, 2022 Wang W +8 more
europepmc +1 more source
[Spectrum-effect relationship of total anthraquinone extract of Cassia seeds against fluorouracil-induced liver injury in mice]. [PDF]
Nan Fang Yi Ke Da Xue Xue Bao, 2023 Wang H +7 more
europepmc +1 more source
Shuitu Baochi Xuebao, 2016 选取黄土丘陵区岔巴沟流域不同位置和不同沟道级别的30条典型切沟为研究对象，基于三维激光扫描技术（LIDAR），建立了基于高分辨率DEM提取切沟形态特征的方法，对比分析了0.1 m与5 m 2种分辨率DEM提取切沟形态特征参数的差异，实现对低分辨率DEM提取的切沟形态特征参数向高分辨率尺度转化。结果表明：基于三维激光扫描技术获取的0.1 m高分辨率DEM提取到的切沟形态特征值与手工测量的切沟形态特征值之间无显著差异，三维激光扫描技术提取切沟长度、宽度、深度、表面积和体积分别是手工测量的94.0%，109 ...
吴红艳, 徐锡蒙
doaj
[Rapid extraction and detection of five alkaloids in dried khat by solvent extraction-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry]. [PDF]
Se Pu, 2023 Shi HF, Xu BP, Xu CX, Zhou XQ, Xu HF.
europepmc +1 more source
Shuitu Baochi Xuebao[目的] 东北黑土区切沟侵蚀不断蚕食耕地资源,威胁我国粮食安全。无人机技术的发展为沟蚀监测提供有效手段,但获取数据分辨率越高耗时越长,如何配置无人机参数,使其既能满足精度要求又能提高航摄效率是当前需要解决的问题。[方法] 选择东北漫川漫岗区的鹤北流域为研究区,以实地断面测量数据为验证值,通过评估不同分辨率、不同飞行航向及不同无人机数据提取的切沟参数精度,探究不同无人机参数配置的适用条件。[结果] (1)与实测值相比,分辨率1 cm数据提取的切沟参数精度最高 ...
唐杰, 谢云, 刘川, 张岩
doaj
[Screening of effective antioxidant components from Trichosanthes extract and assessment of their antioxidant activity]. [PDF]
Nan Fang Yi Ke Da Xue Xue Bao, 2022 Sun M, Zou C, Yan H.
europepmc +1 more source
[Heart rate extraction algorithm based on adaptive heart rate search model]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2022 Meng R, Li Z, Yu H, Niu Q.
europepmc +1 more source
[Review on identity feature extraction methods based on electroencephalogram signals]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2021 Zhong W, An X, Di Y, Zhang L, Ming D.
europepmc +1 more source
[Optimized extraction of active components of <i>Paeonia lactiflora</i> and their antioxidant, anti-inflammatory and pigmentation-reducing effects for skin whitening]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoXu Q +6 more
europepmc +1 more source