Results 21 to 30 of about 5,427 (166)
The Research of Uranium, Iodine and Phosphorus in the Sediments from Nansha Sea area [PDF]
, 2016 本研究以南沙海域8个沉积物柱样（NS-1~NS-8）为研究对象，通过对117个样品含水率、有机碳、铀、碘以及磷元素含量的分析测定，探讨了各元素的地球化学特征，估算了NS-7和NS-8两个长柱样的沉积速率，得到其沉积年代，由此分析十几万年以来的沉积环境变化，得到的结果对南沙海域所蕴含的环境变化研究具有指示意义。 主要研究结果如下： 1）铀的地球化学研究。对沉积物中铀的测定方法进行了条件实验，测定了沉积物中铀含量范围值为1.03-2.95mg/kg，平均值为1.76mg/kg ...
胡盼盼
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Recently, cobalt/nitrogen co‐doped materials have emerged as heterogeneous catalysts to activate peroxymonosulfate (PMS) and have been applied to advanced oxidation processes for environmental remediation. However, their recyclability and reusability remain major barriers to practical application.
Wen‐Kai Zhu +11 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 为探明坡耕地土壤有机碳空间分布特征，对紫色土丘陵区坡耕地不同部位土壤有机碳及活性有机碳顺坡和深度分布进行分析。结果表明，坡耕地上坡土层深度仅为22.3 cm，中坡和下坡土层深度约为上坡的2.01倍和3.30倍；与上坡比较，中坡和下坡土壤容重下降了0.2和0.04，土壤孔隙度增加了19.82%与3.83%。沿坡从上向下土壤有机碳及活性有机碳储量显著增加，下坡土壤有机碳及活性有机碳储量比上坡和中坡分别增加了674.74%，104.09%和958.51%，267.75 ...
樊红柱, 张泽洪, 郭, 蒋
doaj
Studies on Environmental Physiology of coccolithophorids and diatoms [PDF]
, 2015 随着大气CO2浓度不断升高，浮游植物面临海洋酸化，温度升高，上部混合层变浅导致其在该层内受光量增加等一系列环境变化。尽管迄今的研究，对这些环境变化与浮游植物的关系，有一定认识，但争议性强的报道多，尚不能预测海洋初级生产过程的变化趋势。为此，本文以海洋中常见的颗石藻与硅藻为材料，开展了阳光辐射、海洋酸化及升温对其生理生态学特征影响的研究，同时，探讨了这些环境因子的耦合效应对两类藻种间关系的影响。主要结果如下: 1、颗石藻光合与钙化作用的关系。 降低海水钙离子浓度 ...
邢涛
core
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Biomass‐derived quinones are promising green and sustainable cathode materials for sodium‐ion batteries (SIBs), yet their practical application is hindered by poor cycling stability due to dissolution in conventional electrolytes. Herein, we demonstrate that sodiumation is an effective strategy to enhance both rate capability and cycling ...
Xinyue Zhu +4 more
wiley +1 more source
Shuitu Baochi Xuebao, 2019 为探明碳氮添加4年后，土壤全氮、有机碳及其组分（可溶性有机碳、微生物量碳、轻组和重组有机碳）的变化特征，依托布设于甘肃省定西市安定区李家堡镇的不同碳源配施氮素田间定位试验，涉及秸秆、生物质炭、氮素3个因素，秸秆设置为不施、施用秸秆2水平）生物质炭为不施和施用生物质炭2个水平）氮素设置为不施氮、施纯氮50 kg/hm2、施纯氮100 kg/hm2 3个水平，共9个处理。结果表明：不同处理下土壤全氮、有机碳及其组分的含量均随土层的加深而降低。添加生物质炭对土壤全氮、有机碳及其组分均具有不同程度的提升效应 ...
江晶 +4 more
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Field Study on Effects of Simulated Sea Level Rise on Main Processes of Organic Carbon in Kandelia obovata Mangrove Ecosystems [PDF]
, 2015 本研究以厦门曾营海岸三个不同高程样地的秋茄红树林为研究对象，在模拟海平面上升80cm红树林（SLR80cm）、模拟海平面上升40cm红树林（SLR40cm）以及对照红树林（SLR0cm，大约相当于福建九龙江口红树林的滩面高程），探讨海平面上升对秋茄（Kandeliaobovata，以前学名为Kandeliacandel）红树林生态系统主要有机碳过程的影响。 SLR80cm样地的植株矮小、林相稀疏，生长状况明显不如SLR40cm和SLR0cm样地。各样地植株的生物量以及年增量总体均呈现出SLR0cm ...
高敏
core
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Tellurium (Te), emerging as a promising alternative to sulfur (S) and selenium (Se), offers significant advantages for potassium (K) ion storage due to its comparable theoretical volumetric capacity (2619 mAh cm−3) and higher electronic conductivity (∼102 S m−1), which promotes rapid charge transfer and improves reaction kinetics.
Sung Woo Cho +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 以名山河流域不同类型土壤为研究对象，研究了不同土地利用方式下土壤有机碳和团聚体中有机碳含量的分布特征。结果表明：（1）名山河流域3种类型的土壤有机碳含量在17.50~34.70 g/kg之间，含量高低表现为水稻土>黄壤>紫色土，水稻土含量分别是黄壤和紫色土的1.32，1.39倍；从不同的土地利用方式看，水田土壤有机碳及活性有机碳含量显著高于旱地、茶园和果园，土壤活性有机碳与土壤有机碳呈极显著正相关（R2=0.884 6）；（2）土壤有机碳含量在土壤剖面中表现出随着土层深度的增加而降低的趋势，表层土壤（0—
李欣雨 +4 more
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Emerging as attractive alternatives for sustainable, low‐cost, and high‐performance electromagnetic interference (EMI) shielding, biomass‐derived carbon is nonetheless constrained by a limited repertoire of shielding mechanisms. Herein, a straightforward method was employed to synthesize self‐supporting Co nanoparticles embedded in porous N ...
Yingjie Xu +6 more
wiley +1 more source