Results 31 to 40 of about 84,955 (170)
Shuitu Baochi Xuebao, 2019 为了解驾校不同微环境地表灰尘中Hg的污染情况，使用测汞仪（Hydra II C）测定了芜湖市区26个驾校全粒径和细粒径灰尘样品中Hg的含量，并进行了统计分析。结果表明：芜湖市区驾校地表全粒径和细粒径灰尘中Hg的平均含量分别为49.36，59.97 ng/g，均低于芜湖市土壤背景值，且全粒径与细粒径灰尘中Hg含量存在极显著性差异（P S弯 > 侧方位停车 > 直角转弯 > 坡道定点，细粒径灰尘则表现出：倒车入库 > S弯 > 侧方位停车 > 坡道定点 > 直角转弯，两者呈现出相似的规律，其中倒车入库 ...
王月 +6 more
doaj
Direct Observation of Matrix‐to‐Precipitate Elemental Diffusion in Severe Plastic Deformation
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Elemental redistribution, particularly the solute exchange between the matrix and precipitates, is a central issue in alloys subjected to severe plastic deformation (SPD). To elucidate this behavior, a nickel–aluminum bronze (NAB) alloy was processed by high‐pressure torsion (HPT), and its microstructural evolution was systematically ...
Xiaobin Yang +9 more
wiley +1 more source
Gongye shui chuli, 2008 采用浊度法检测含有微量细小的分子筛颗粒和金属镍颗粒的悬浮液中微量固体颗粒浓度,并对相关因素的影响进行了研究。结果表明:在实验范围内,悬浮液微细颗粒的浓度与悬浮液浊度成线性关系；对微细颗粒悬浮液,采用d32(Sauter直径)作为平均直径比采用中位直径d50更能反应出粒径因素对浊度的影响。
孟庆功 +3 more
doaj
冻融循环次数和土壤含水率对油松林土壤团聚体及有效态微量元素的影响
Shuitu Baochi Xuebao, 2020 以王茂沟流域典型人工油松林土壤为对象，研究了不同冻融循环次数（0，3，9次）和不同土壤含水率（40%FC，60%FC，80%FC）条件下土壤团聚体组成和团聚体中4种有效态微量元素（Cu、Fe、Mn、Zn）的演变特征。结果表明 ...
姚珂涵, 肖列, 李鹏, 高扬
doaj
, 2016 本发明提供了一种超小粒径锡及锡基合金纳米颗粒的制备方法及其应用。具体地，本发明提供了锡-锡基合金-碳纳米管复合材料，其特征在于，包括碳纳米管，以及与所述的碳纳米管复合的锡-锡基合金纳米颗粒，其中，所述的纳米颗粒的粒径为0.1-10nm。所述锡及锡基合金纳米颗粒与碳纳米管的复合材料可用于制备电池负极活性材料，且其应用于锂离子电池时，表现出高容量 ...
韩伟强, 辛凤霞
core
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The thermal expansion mismatch between sapphire and Ti‐6Al‐4V (TC4) alloy has traditionally limited the shear strength of ceramic‐metal joints to ≤ 170 MPa. In this study, active brazing with Ag‐35.25Cu‐1.75Ti (wt%) leads to the formation of a dual‐function microstructure, wherein uniformly dispersed submicron Ti3(Cu,Al)3O particles embedded ...
Hairui Liu +13 more
wiley +1 more source
Shuitu Baochi Xuebao, 2020 为了研究不同有机物料对原生盐碱土微团聚体粒径分布状况及不同粒径微团聚体间有机碳含量的影响，以施用有机物料的原生盐碱土为试验对象，设置空白处理（CK）、颗粒状秸秆处理（GW）、正常玉米秸秆处理（CS）、牧草处理（GS）和羊粪处理（SM），采用大田试验与室内分析相结合的方法，研究不同有机物料施用下土壤微团聚体的粒径分布状况及不同粒径微团聚体间有机碳含量，分析不同粒径微团聚体间有机碳对土壤微团聚体稳定性的贡献。结果表明，施用有机物料各处理较CK处理均增加土壤2~0.25 mm的团聚体含量，增幅为9.02 ...
陈晓东 +4 more
doaj
, 1999 假设泥石流中的粗颗粒（如石块等）以跳跃的方式前进，通过分析单个颗粒在定常充分发展的流场中的运动，给出了单一起跳速度下以及具有一定分布的起跳速度下，颗粒数密度随高度的分布，并给出了起跳粒径有分布时颗粒的平均粒径随高度的分布 ...
马富华, 钟钊新, 刘大有
core
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The inherent trade‐off between high saturation induction (Bs) and low core loss in soft magnetic materials presents a challenge in the development of high‐frequency power electronics. Here, a processing approach that combines accelerated Cu ordering with dual magnetic anisotropy control in high‐Bs Fe‐based nanostructured cores is examined ...
Xiaoying Li +11 more
wiley +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Aqueous zinc‐ion batteries (AZIBs) hold great promise for safe and sustainable energy storage, but their commercialization is impeded by severe Zn dendrite growth and interfacial instability. To address these challenges, we propose a defect engineering strategy employing ultrafine ZnAl2O4 (ZAO) nanoparticles (∼5 nm) with oxygen vacancy defects
Yilun Ren +9 more
wiley +1 more source