Results 11 to 20 of about 2,487 (111)
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 6, Page 806-814, June 2026.ABSTRACT Objective To investigate the incidence of pre‐eclampsia (PE) and the predictive performance of the Fetal Medicine Foundation (FMF) first‐trimester PE screening algorithm across pregnancies conceived using assisted reproductive technology (ART), after ovulation induction (OI) and through spontaneous conception (SC).
A. S. L. Kjaer +23 more
wiley +1 more source
Shuitu Baochi Xuebao, 2020 为深入探究辽西低山丘陵区坡耕地土壤侵蚀机理，以该区的典型土壤类型褐土和棕壤为研究对象，采用室内人工降雨模拟试验，研究3种坡度（5°，10°，15°）和3种降雨强度（40，60，80 mm/h）下细沟侵蚀发生的阶段性水沙变化过程。结果表明：褐土与棕壤坡面侵蚀过程可划分为3个阶段，即细沟侵蚀之前阶段、跌坎发育阶段和细沟侵蚀快速发育阶段；细沟侵蚀之前的面蚀阶段，同一坡度条件下，褐土与棕壤随雨强的增加，坡面流速呈增大趋势，而在同一雨强条件下，坡度对流速的影响并无明显规律；细沟侵蚀阶段，当坡度一定条件下 ...
吕刚 +6 more
doaj
Integrative Conservation, Volume 4, Issue 3, Page 272-276, September 2025.This photo displays one of our camera locations within the core area of Mt. Siguniang National Nature Reserve, China. The site features steep scree slopes and > 1000 meters elevational gradient with minimal anthropogenic disturbance. Camera traps captured three unique snow leopard individuals (Mr.
Dongrui Wang +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2023 为探究花岗岩红壤细沟形态特殊变化的原因,解释土体构型影响细沟形态发育的机理。设计单一红土层(H)、单一砂土层(S)、上红下砂层状土层(HS)3种土体构型、不同径流量(低径流量3 L/min、高径流量6 L/min)和不同坡度(中坡20°、陡坡40°)的室内模拟细沟冲刷试验。结果表明:H处理下,细沟形态更多向"V"形和"U"形发育;S处理下,细沟沟道发育过程中短暂形成上窄下宽的深宽梯形断面后,完全崩塌;HS处理下,细沟形态能发育为梯形断面,且能继续扩大发育。与H和S相比,HS陡坡(40 ...
刘子轩 +4 more
doaj
Joint Extraction Method for Spatial Relations in Chinese Geological Texts
Earth and Space Science, Volume 12, Issue 8, August 2025.Abstract Extracting spatial relations of geological entities is an important prerequisite for achieving natural language processing tasks such as geological knowledge question answering and semantic search, and is an important means to achieve structural reconstruction of unstructured geological data.
Chuan Chen +9 more
wiley +1 more source
Plant nutrient‐acquisition strategies contribute to species replacement during primary succession
Journal of Ecology, Volume 113, Issue 4, Page 988-1003, April 2025.Pioneer species Hippophae acquires phosphorus and nitrogen mainly by ‘mining’ and N2‐fixing strategies and thus dominates in the beginning of primary succession. As soil nutrient availability increases with the mobilization of apatite‐P and input of N‐rich plant residues, Hippophae' strategies become less efficient than Populus's scavenging strategies.
Xiao‐Long Li +12 more
wiley +1 more source
Defining, collecting, and sharing perishable disaster data
Disasters, Volume 48, Issue 1, January 2024.Researchers across disciplines have long sought to collect ‘perishable data’ in the context of disasters. Yet, this data type is neither consistently defined nor discussed in specific detail in the literature. To address this gap, this paper defines perishable data and provides guidance on ways to improve both how it is collected and shared.
Rachel M. Adams +2 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 基于室内人工模拟降雨试验方法，选取细沟密度、细沟割裂度和细沟宽深比3个细沟形态指标，对晋西黄绵土坡面细沟形态演变特征进行分析，并探讨了降雨条件下不同坡长坡面细沟形态对产流产沙规律的影响。结果表明，晋西黄绵土坡面细沟形态演变过程为先形成跌坎，跌坎贯穿发育为细沟，再形成细沟网，最后发生细沟崩塌。细沟密度与割裂度均随坡长和雨强的增大而增大，细沟宽深比随二者的增大而减小；坡长对细沟密度和细沟宽深比的影响较雨强敏感，而降雨强度对细沟割裂度的影响更加敏感。坡面平均产流率随坡长的变化可用线性函数描述（R2＞0.95），
裴冠博, 龚冬琴, 付兴涛
doaj
Shuitu Baochi Xuebao, 2021 为探究高寒土坡面细沟侵蚀过程机理，建立科学的坡面细沟输沙能力因子模型，服务高寒坡面水土流失治理工作，以藏东南高寒土壤为研究对象，采用室内径流放水冲刷试验，探讨不同流量和坡度条件下细沟水流输沙能力特征。结果表明：（1）高寒土坡面细沟水流输沙能力的临界坡长随输沙能力的增加而变短，范围为3.27~8.31 m；坡度在15°~25°时，临界坡长大约稳定在5.0 m；（2）不同坡度下，高寒土细沟水流输沙能力与流量表现为明显的线性正相关关系（Tc=Aq）；小坡度的输沙能力受流量的影响程度大于大坡度；（3 ...
喻武 +5 more
doaj
Shuitu Baochi Xuebao, 2020 通过组合不同坡度（25°，30°，35°，40°，45°，50°）、不同流量（0.6，1.0，1.5，2.0，2.5 L/min）的室内放水冲刷试验，对急陡黄土坡面细沟侵蚀发生过程中的细沟水动力学特性进行了研究。结果表明：细沟水流平均流速随细沟的发育呈现出先减小后稳定的变化趋势。细沟流的雷诺数Re在199.996~873.482变化，且主要受流量的影响，随着流量的增大呈线性关系；而弗劳德数Fr在整个细沟发育过程中均大于1，表明细沟流均处于急流范围，且与流量呈倒数关系，随着放水流量的增大Fr呈曲线减小 ...
杨茹珍 +3 more
doaj