Results 51 to 60 of about 2,446 (165)
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
Shuitu Baochi Xuebao, 2005 对科尔沁沙地不同沙漠化阶段土壤有机碳、全氮含量、土壤质地以及碳氮密度进行了测定与分析。结果表明,沙漠化过程中不同阶段的特征体现在土壤碳、氮、颗粒组成的有规律变化,土壤碳、氮含量衰减,质地变粗;从潜在沙漠化阶段到严重沙漠化阶段,100 cm深土壤有机碳和全氮含量分别下降91.6%和85.8%,有机碳密度从4 877.9(C)g/m2下降到481.8(C)g/m2,全氮密度从518.0(N)g/m2下降到89.4(N)g/m2;土壤有机碳、全氮与土壤细颗粒组分(
李玉强 赵哈林 赵学勇 张铜会 移小勇 左小安
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Shuitu Baochi Xuebao, 2017 为阐明喀斯特小流域土壤有机碳密度分布特征及有机碳储量空间分布格局，采用野外布点采样、实验室测定和地统计学分析相结合的方法，利用2 755个详细调查的剖面样地和23 536个土壤样品，定量研究了喀斯特小流域土壤有机碳密度、碳储量的空间异质性及分布特征。结果表明：后寨河小流域表层（0—20 cm）土壤有机碳含量和密度的平均值为分别为25.07 g/kg和5.23 kg/m2，剖面土壤（0—100 cm）土壤有机碳含量和有机碳密度分别为20.71 g/kg和10.21 kg/m2 ...
张珍明, 周运超, 黄先飞, 田
doaj
Evolution Characteristics of Soil and Water Conservation Carbon Pool and Its Carbon Sink Potential in Typical Small Watershed of the Loess Plateau [PDF]
[Objective] To investigate the evolution of soil carbon pool under catchment scale integrated soil and water conservation measures and evaluate the potential of soil and water conservation carbon sink. [Methods] Typical small watershed for soil and water
DONG Pengbei +5 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT To break electromagnetic wave absorption (EMA) tech's single‐attenuation bottleneck, enhancing multi‐wave absorption synergy in composites is key for microstructure design. This study uses mesoporous hollow carbon spheres to make metal nanospheres with cobalt, iron, and nickel nanoparticles, then encapsulates them via electrospinning into a ...
Wei‐Lian Zhang +10 more
wiley +1 more source
Shuitu Baochi Xuebao, 2017 为了定量研究燕山山地不同林龄华北落叶松人工林的碳密度特征及其分配格局，为森林碳汇服务功能提升提供科学依据。以河北省木兰围场国有林场管理局新丰林场3种林龄（11，21，32 a）华北落叶松人工林为研究对象，基于9块样地本底调查和27株标准木树干解析数据，采用标准木回归分析法、样方收获法、土壤剖面取样法和重铬酸钾—浓硫酸氧化外加热法等，获取不同林龄华北落叶松人工林的碳密度，分析了其特征及变化趋势。结果表明：不同林龄华北落叶松人工林生态系统总碳密度表现为32 a（97.29 t/hm2）＞21 a（90.56
马长明, 赵, 牟洪香, 刘炳响
doaj
采用全国第二次土壤普查数据结合作者的实测数据,利用1∶100万土壤数据库对青藏高原土壤有机质层、土壤矿质层及整个剖面的土壤有机碳密度和土壤有机碳储量分别进行了估算。结果表明:青藏高原的平均土壤有机碳密度约为C7.2kgm-2,较前人的C8.01~19.05kgm-2全国平均土壤有机碳密度偏低。青藏高原总的土壤有机碳储量约为18.37Pg,其中有机质层土壤有机碳储量约占38.14%,矿质层土壤有机碳储量则占61.86%。中国科学院知识创新工程重要方向项目(KZCX3-SW-339-04 ...
周才平 +4 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Ni3S2 has emerged as a promising catalyst for the electrochemical oxidation of biomass‐derived 5‐hydroxymethylfurfural (HMF) to 2,5‐furandicarboxylic acid (FDCA), driven by its distinctive physicochemical properties. However, its practical catalytic efficiency is severely hindered by abundant electrochemically inactive surface sites and poor ...
Cheng‐Feng Yi +5 more
wiley +1 more source
Shuitu Baochi Xuebao, 2022 为研究不同密度马尾松人工林枯落物输入对土壤理化性质和林分生长影响,选择适宜的人工林经营措施提供参考。以2 500,3 300,4 500,6 000株/hm2(分别记为M1、M2、M3和M4)4种造林密度的马尾松人工林为研究对象,利用结构方程探究不同密度马尾松林枯落物输入对土壤性质的影响。结果表明:林分密度对枯落物和土壤理化性质均具有显著影响,其中枯落物总蓄积量和持水量表现为M2密度最大,显著高于其他密度;同时M2密度中枯落物碳、氮、磷、钾养分储量最大,以有机碳为主,占总储量的96.98 ...
李鹏 +6 more
doaj
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