Results 41 to 50 of about 9,059 (155)
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Spatial segregation in at‐sea distribution is frequently observed in seabirds and can have important implications for conservation and management. Globally, many albatross and petrel populations are declining due to bycatch in fisheries. In South Georgia, the decrease in wandering albatrosses (Diomedea exulans) differs among breeding sites ...
V. Warwick‐Evans +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2020 为研究小流域尺度下土壤有机碳的变异规律，运用地统计学方法对研究区0—10，10—20，20—40 cm土壤有机碳含量的空间变异性进行了研究。结果表明：流域内不同土层有机碳含量属于中等强度变异，具有强烈的空间自相关性；土壤有机碳含量在0，135°方向上空间变异程度明显，空间分布的各向异性显著；克里格插值结果显示流域内阴坡土壤有机碳含量明显高于阳坡，高海拔区域土壤有机碳含量高于低海拔区域；不同土层间，土壤有机碳含量均表现为青海云杉 > 灌丛 > 草地，表明不同植被类型对土壤有机碳含量和分布有着重要影响 ...
芦倩, 李毅, 刘贤德, 赵维俊
doaj
, 2015 随着空间分析方法的日益丰富以及局部地理数据可获得性的增加,空间流行病学在对传统流行病学进行拓展的基础上成为系统的流行病学分支[1]。疾病制图(dISEASE MAPPIng)是空间流行病学研究的基本任务,其主要目的在于将疾病危险的空间变异或时空变异在地图上呈现出来[2],使人们获得直观、感性的认识,为进一步病因学研究或其他研究提供线索。传统的疾病地图如标点地图、等值区域图 ...
徐丽, 方亚
core
International Journal of Applied Linguistics, Volume 36, Issue 1, Page 522-539, February 2026.ABSTRACT This paper examines the features of metadiscourse across different teacher moves in university linguistics classroom discourse and the teaching strategies reflected in its use. The results reveal that teachers employ diverse metadiscourse during classroom interactions to support student reasoning.
Jingjie Li, Wenjie Hu
wiley +1 more source
Application of Kriging Method in the First Arrival Tomographic Statics Correction [PDF]
, 2009 西部地区地震勘探工作多是在山地、山前带、沙漠、沟壑纵深区等低降速带变化大的复杂地区进行,静校正问题成为制约勘探成效的瓶颈问题。如果在数据采集时,考虑到地学断面空间结构横向上存在的相关性,引入地质统计学的克里格(krIgIng)方法估计整个区域内的静校正值,根据静校正值估计分布图合理布置炮点与接收点的位置,从而可以获得静校正量变化更加平稳的数据,提高地震初至波的分辨率,最终得到高质量的地震剖面。根据这一思路,编制了初至层析克立格静校正软件。Since seismic exploration in the ...
张元鹏
core
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 6, Page 738-746, December 2025.ABSTRACT Objective To evaluate the performance of non‐invasive prenatal testing (NIPT) in vanishing‐twin and multiple pregnancies. Methods This study was conducted as part of the TRIDENT‐2 study, in which NIPT was offered as a first‐tier screening test to women with a multiple pregnancy or vanishing‐twin pregnancy between 1 June 2020 and 31 March 2023 ...
J. C. A. van Eekhout +86 more
wiley +1 more source
Shuitu Baochi Xuebao, 2002 探讨了研究土壤空间变异所必须考虑的相关尺度问题，立足国内，兼顾国外，介绍了近年来土壤特性空间变异性几种研究方法及应用的研究动态，讨论了空间变异研究方法的各自特点及今后研究和应用的发展趋势，展望了空间变异性研究在土壤科学、水土保持与水资源系统中的应用前景。
李毅 王文焰 王全九
doaj
Shuitu Baochi Xuebao, 2023 喀斯特坡面伴随有大量直径＞25 cm的块石出露,为探明块石出露对土壤理化性质的影响,以坡面4个块石出露的农地和1个对照组为研究对象,分析土壤理化性质空间变异特征。结果表明:(1)在块石出露的农地中,土壤容重、黏粒、粉粒和砂粒的变化分别为0.87~1.42 g/cm3,25.70%~41.80%,38.11%~51.60%,13.76%~27.54%,土壤容重、黏粒和粉粒空间变异性均为弱且高于对照组,砂粒空间变异性为中等且低于对照组。(2)土壤全碳、全氮、全磷、全钾变化分别为9.82~23.13,0.94~
陈磊, 张卓栋, 李业桐
doaj
, 2007 采用多种测试方法分析了长江主要支流和干流的悬浮物和细粒河漫滩沉积物的Sr-Nd 同位素组成, 进而讨论其对河流沉积物物源的示踪意义. 悬浮物从上游到下游「Epsilon」Nd(0)逐渐减小, 上游平均为−10.8, 中下游为−12.3; 87Sr/86Sr 逐渐增大, 上游和中下游分别为0.721899 和0.725826. 这一变化规律反映了长江水系不同流域的源岩类型、化学组成特征和风化作用强弱等多因素的制 约.
Jiang, S +5 more
core
Spatial relationship between root system and soil properties of mature and densely planted Kuerlexiangli pear under long-term strip fertilization [PDF]
[Objective] Kuerlexiangli pear (Pyrus sinkiangensis Yü et Lu.) is the main cultivar in Southern Xinjiang. In recent years, the main trunk dense planting pear orchard has developed rapidly and entered the peak fruiting period.
AN Shijie +9 more
core +1 more source