Results 41 to 50 of about 10,247 (162)
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 3, Page 376-384, March 2026.ABSTRACT Objective To investigate whether combining abnormal morphological features observed on ultrasound in live pregnancies that ended in a first‐trimester miscarriage can predict an abnormal karyotype. Methods This retrospective observational cohort study was conducted at the early‐pregnancy assessment unit at University College London Hospital ...
T. Setty +5 more
wiley +1 more source
Shuitu Baochi Xuebao, 2018 为了探究双季稻田典型自然降雨径流过程中氮（N）的输出特点，采用田间径流池法，通过长期田间定位试验，比较普通尿素（U）和控释尿素（CRU）减施稻田径流水中总氮（TN）、铵态氮（NH4+-N）和硝态氮（NO3--N）的动态变化及N素径流流失量和流失率。结果表明：稻田施肥初期出现N素径流峰值，是防控N素径流损失的关键时期。早、晚稻季生育期间施N处理径流水中以NH4+-N为主要形态，分别占TN径流损失量的64.5%~66.3%，61.0%~68.6%。早、晚稻季U处理径流水TN流失量（率）分别为5.6（2.2%）
田昌 +7 more
doaj
Geochemistry of surface sediments from the continental shelf of the East China Sea and small rivers of SE China: Constraints on chemical weathering and provenance [PDF]
, 2015 沉积物元素地球化学特征可为沉积环境演化历史提供重要信息，包括沉积物物源、物源成分特征、物源区岩石风化侵蚀程度、成岩作用、沉积物传输、沉积过程及古气候变化等。本研究于东海大陆架，瓯江、闽江和晋江河口共采集79个表层沉积物样品，分析其常微量元素地球化学特征并探讨物源区性质及化学风化特征。UCC和UC-YC标准化蛛网图表明，CaO、Na2O、Ba和Sr呈现出不同程度的亏损，而Rb元素则轻微富集。硅酸盐风化指数(CIA、PIA和CIW)及三角形图(A-CN-K、(A-K)-C-N和A-CNK-FM ...
林宝治
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The poor Zn chemistry of Zn metal anode and sluggish reaction kinetics of cathodes at high mass loadings are two crucial issues for hindering the application of aqueous Zn‐ion batteries (AZIBs). Herein, the hierarchical porous N‐doped carbon fibers (HPNCFs) were proposed to simultaneously optimize the reversibility of Zn plating/stripping of ...
Song Yang +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2006 以黄土高原中部泾河及其7个子流域为研究对象，选取了流域内8个水文站33年的径流量和输沙量以及30年的降水量数据，同时对2002年的MODIS数据进行分类处理，分析了不同流域的水沙变化差异及其地表覆被类型特征。结果表明：泾河流域近50年来的输沙量略有下降，而径流量减少比较显著；泾河及其7个子流域的水沙变化和9种地表覆盖类型空间格局的差异显著；地表植被类型较好的流域，径流量相对较大而输沙量相对较小，且径流量与输沙量的起伏波动较小，反之则流域的径流量相对较小而输沙量相对较大，且径流量与输沙量的变化明显。
王兮之 +4 more
doaj
Research of Water Environmental Capacity and Total Amount Control of the Yongding River [PDF]
, 2016 水不仅作为地球环境中的基本因子，也是维护人类生活和社会稳定的核心自然要素。近几十年来伴随我国改革开放带来的社会经济跨越式发展，水污染问题日益突出，水环境质量明显下降，严重地影响了人民的生产、生活及周边的生存环境。要解决水污染问题，首先应确定水环境容量，控制污染物排放总量。因此，对流域水质、水环境容量进行全面、系统地分析并确定流域的水环境容量，是执行污染物总量控制的基本手段，也是有效保护和合理利用水资源的依据。开展流域水环境容量核算研究既可以制定合理的污染物排放总量控制目标 ...
苏源
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Photocatalytic molecular oxygen (O2) activation provides a sustainable approach to produce singlet oxygen (1O2) for organic contaminants detoxification. However, the charge carriers‐involved pathway usually suffers from unsatisfactory 1O2 production efficiency owing to energy loss caused by photogenerated hole‐mediated superoxide species (•O2−
Yan‐Biao Shi +8 more
wiley +1 more source
Impacts of storm event on DOM composition and flux in two Jiulong Tributaries with different watershed features [PDF]
, 2016 通过调查2014年7月"麦德姆"台风影响期间福建九龙江北溪(流域以林地为主)和西溪(农业流域和城市背景)下游定点站DOM的时间序列,测定样品的DOC含量及其吸收光谱和三维荧光光谱,以评估不同流域背景对河流DOM动力学降雨响应的差异性,并为流域-河口系统的一体化管理提供重要参考。降雨期间,两条河流DOC浓度、吸收系数aCDOM(350)以及总荧光强度均随径流量升高而增大,并在水位下降期持续增加,且西溪增加量明显高于北溪,说明受人类活动扰动大的流域河流有机质对暴雨事件的响应更为灵敏 ...
徐静 +5 more
core
Multipath traffic splitting algorithm based on adaptive granularity [PDF]
, 2015 Aiming at the dilemma between load balancing and packet reordering in multipath routing,an adaptive dynamic multipath traffic splitting(ADTS) algorithm was proposed.The algorithm classified Internet flows into two categories:the aggressive and the normal
Ju-long LAN, Peng WANG, Shu-qiao CHEN
core +1 more source
Engineering 2D Materials for High‐Current‐Density Electrocatalytic Water Splitting
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Water electrolysis is a key method for sustainable hydrogen production, using water as an abundant resource. However, efficient and stable operation at high current densities remains challenging due to energy losses, catalyst degradation, and limited ion–electron transport.
Tianqi Guan +8 more
wiley +1 more source