Results 61 to 70 of about 153 (89)

东北典型黑土区不同级别沟道形态特征分析

open access: yesShuitu Baochi Xuebao
目的通过解析东北典型黑土区小流域沟系特征和不同级别沟道形态差异,探索侵蚀沟和河道划分方法。方法选取黑龙江省宾县典型黑土分布区的小流域(14.59 km²),基于无人机影像及其生成高精度数字高程模型,利用Strahler河网分级法对永久性沟道进行分级。结果小流域沟道线密度为3.87 km/km²,各级沟道数量随着等级增加呈指数递减趋势。1级沟道数量占比最高(64.60%),2级沟道的长度和面积占比最大(分别为37.62%和29.57%),4级以上沟宽明显增大,5~6级的沟长、沟宽和面积均明显高于低等级沟道,
邢慧淼   +4 more
doaj   +2 more sources

[Kaposi sarcoma combined with severe ulcerative colitis: A case report and literature review]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban, 2020
Li J   +5 more
europepmc   +1 more source

[A ssociations of short-term ambient particulate matter exposure and <i>MTNR1B</i> gene with triglyceride-glucose index: A family-based study]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban
Guo H   +13 more
europepmc   +1 more source

[Analysis of medication characteristics of traditional Chinese medicine in treating COVID-19 based on data mining]. [PDF]

open access: yesZhejiang Da Xue Xue Bao Yi Xue Ban, 2020
Fan T   +7 more
europepmc   +1 more source

[Clinical practice guideline for pediatric scar prevention and treatment (2025 edition)]. [PDF]

open access: yesZhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Chinese Burn Association.
europepmc   +1 more source

东北黑土区土壤侵蚀阻力对土地利用类型的响应与影响因素

open access: yesShuitu Baochi Xuebao
[目的] 土壤侵蚀阻力反映了土壤抵抗侵蚀的性能,包括细沟可蚀性(Kr)和土壤临界剪切力(τc)。通过水槽冲刷试验探究不同土地利用类型下土壤侵蚀阻力差异及其主控因素,为揭示东北黑土区土壤侵蚀动力机制提供理论基础。[方法] 在黑龙江省嫩江市鹤山农场鹤北小流域选取7种典型的土地利用类型,利用水槽冲刷试验测定土壤分离能力,拟合了Kr和τc,采用相关分析和偏最小二乘回归方法,确定影响土壤侵蚀阻力的主要因素。[结果] (1)不同土地利用类型样地Kr为0.003~0.372 s/m,道路Kr最高,与农地相比,草地 ...
张宁, 张光辉, 邢书昆
doaj  

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