Results 11 to 20 of about 5,443 (113)
Zhejiang Daxue xuebao. Lixue ban, 2022 通过对杭州湾南岸HZW1907长84 m及甬江口YJ19-02长9 m柱状样进行粒度分析、X射线衍射（XRD）分析，研究了沉积物粒度变化、黏土矿物特征，探讨杭州湾地区晚更新世以来源区风化程度、水动力条件变化、物质来源及环境演变情况。根据岩性粒度特征及黏土矿物变化规律，将HZW1907柱状样划分为4个沉积阶段：阶段1（0~26 m）、阶段2（26~49 m）、阶段3（49~70 m）、阶段4（70~84 m）。阶段4和3处于晚更新世至早全新世，沉积物以粉砂、砂质粉砂、粉砂质砂为主，处于湖泊河床相 ...
HUANGDongqin(黄冬琴) +7 more
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Zhejiang Daxue xuebao. Lixue ban, 2007 应用氢化物发生-原子荧光光谱方法(HG-AFS)研究了舟山岛海域沉积物和生物样中砷的质量分数并进行了评价，结果如下：1.建立方法的线性方程为，If(As) = 6.166 9 C—1.064 9，方法的检出限为0.2 ng/mL，该法测定两种标准样品的偏差分剐为—6.6%和0.2%.2.沉积物和生物体中均检测到一定量的砷，沉积物中砷质量分数为：12.33~16.49 µg/g，生物样中质量分数为：1.31~17.25 µg/g.参考海洋沉积物和生物质量标准，前者属于一类沉积物，后者属于二类海洋生物 ...
WANGPu(王镨) +3 more
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Shuitu Baochi Xuebao, 2007 研究了葫芦岛市3条具有不同污染源类型河流的沉积物中Hg，Pb，Zn的分布特征，应用相关性、富集系数以及首次引人富集系数比（R）来表征不同污染类型河流沉积物重金属间的相对污染程度及来源。结果表明：源于氯碱厂Hg污染的五里河沉积物中Hg，Ph，Zn含量平均值分别超过区域沉积物背景值662，2．21，4．51倍；受锌冶炼厂废水污染的茨山河沉积物中Hg，Ph，Zn含量平均值超过区域沉积物背景值188863．89，123．6倍；受土壤污染的连山河沉积物中Hg，Pb，Zn含量平均值超过区域沉积物背景值10．43，2．
郑娜, 王起超, 郑冬梅, 张少庆
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利用计算机断层扫描技术反演沉积物粒级组成——以黄河水下三角洲现代沉积为例
Haiyang yu huzhao计算机断层扫描技术(computed tomography，CT)可对沉积物岩芯进行高分辨率、无损分析，探索CT数据(即CT值)与沉积物粒度的关系可以实现岩芯沉积物属性的快速、连续获取，有助于对岩芯沉积特征和沉积过程的全面了解。基于采自黄河水下三角洲的多根岩芯，利用CT技术对岩芯进行扫描获取CT值，同时对岩芯进行高分辨沉积物粒度分析，探讨CT值与沉积物粒级组成的联系。研究表明，黄河水下三角洲沉积物以粉砂为主，CT值主要分布于700~1 000 HU之间；沉积物粒度与CT值间存在显著的非线性正相关 ...
张 巍, 刘 晓航, 张 鑫, 范 德江
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Zhejiang Daxue xuebao. Lixue ban, 2003 用XRF法对珠江口12根沉积柱中V,Ni和Co含量进行了分析.V,Ni和Co含量分别在48.97×10-6~180.66×10-6,22.12×10-6~72.67×10-6和9.34×10-6~94.42×10-6之间.3种重金属在河口西部和伶仃洋最大混浊带区域含量高,Co同时在河口北部和香港大屿山西岸沉积物中富集.V,Co和Ni在沉积柱中的垂直分布可分为4种类型:均匀分布型、上部富集型、下部富集型和斜"之"字型,它们是各自沉积环境、污染历史以及人类疏浚河口活动的综合反映.相关分析和因子分析显示 ...
PENGXiao-tong(彭晓彤) +4 more
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Structured machine learning modeling to support conservation of deep‐sea benthic biodiversity
Conservation Biology, EarlyView.Abstract Biodiversity monitoring programs need to deliver accurate, timely, and actionable predictions. To establish a predictive monitoring program for deep‐sea benthos of the Santos Basin, Brazil, we developed a two‐stage structured model that allowed comparison of biodiversity predictions obtained from environmental simulations (2M‐Sim).
Gustavo Fonseca +23 more
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Shuitu Baochi Xuebao, 2004 受多来源沉积物污染影响的水体中可溶性P,Cu,Zn实际浓度常明显低于按各自沉积物的比例与释放量计算的理论值。沉积物之间的性质差异越大,实际测定值与计算值之间的差异也越大。多来源沉积物水体中可溶性P,Cu,Zn的浓度主要受P,Cu,Zn释放能力最强或对P,Cu,Zn吸持能力最强的沉积物比例控制。
章明奎
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT This study developed a metal–modified fluoroethylene vinyl ether (FEVE) organic coating on 6061 aluminum alloy, supported by a micro‐arc oxidation (MAO) pretreatment layer, to enhance corrosion resistance and antifouling performance in marine environments.
Chang Liu +5 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Biodegradable zinc (Zn)‐based materials are considered promising candidates for orthopedic applications because of their favorable mechanical properties, controllable biodegradability, and good biosafety profiles. However, their clinical translation is limited by early‐stage corrosion‐induced cytotoxicity and inflammation, as well as ...
Jinlong Mao +9 more
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Functional Ecology, Volume 40, Issue 7, Page 2221-2236, July 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Anthropogenic nitrogen (N) deposition is a major driver of global change. However, its effects on the developmental plasticity of plant nutrient strategies remain poorly understood.
Quan Li +11 more
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