Results 11 to 20 of about 18,362 (168)
Rare Metals, EarlyView.ABSTRACT Porous NiTi alloys are widely used in biomedical and engineering fields. Using the PBF‐LB technique, the TPMS and Voronoi porous parts with a porosity of ∼67% and a minimum feature size of 0.15 ± 0.02 mm were fabricated. Although the bulk sample fabricated with the same parameters is defect‐free, μ‐CT reconstruction on the porous sample ...
Wen‐Hao Zeng +7 more
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Rare Metals, EarlyView.ABSTRACT The transformative potential of gallium nitride high electron mobility transistors (GaN HEMTs) in advancing carbon‐neutral power systems remains bottlenecked by contact resistance (Rc) at the metal–semiconductor (M‐S) interface, a critical determinant of switching losses and frequency response.
Ji‐Zhou Zhang +8 more
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Rare Metals, EarlyView.ABSTRACT With the continuous advancement of materials science and technology, the rare metal gallium has increasingly emerged as a promising alternative to the toxic metal mercury. Although existing research has predominantly focused on the high electrical conductivity and excellent deformability of liquid metal (LM), its intrinsic fluidic property ...
Feifan Guo +6 more
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Rare Metals, EarlyView.ABSTRACT The similar physicochemical properties of alkali metal elements make the co‐enrichment and precise separation of Cs+ and Rb+ in complex brine systems highly challenging. Here, an all‐inorganic strategy is proposed, which achieves efficient enrichment and precise separation of Cs+ and Rb+ in high‐salt systems by constructing Sr2+/Ba2+‐based ...
Kang Li, Ruixin Ma, Shina Li
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Rare Metals, EarlyView.ABSTRACT Transition metal‐based amorphous/crystalline (a/c) heterostructured catalysts have garnered significant attention due to their exceptional activity, stability, and cost‐effectiveness. However, the precise synergistic regulation of interfacial composition and phase states remains challenging.
Haoran Li +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2004 土壤重金属的积累可促进地表径流中重金属的流失,流失量与土壤中重金属的形态有关。田间观测和室内模拟淋洗试验的结果都表明,径流或淋出液中重金属主要来源于土壤的交换态(包括水可溶态)重金属;土壤重金属总量与径流中重金属浓度相关不明显;用稀盐(0.01mol/LCaCl2)和1mol/LNH4OAc提取的土壤重金属量与径流和淋出液中重金属浓度都呈显著的相关,可较好地表征土壤中重金属流失潜力。
章明奎 夏建强
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Zhejiang Daxue xuebao. Lixue ban, 2010 以城市污泥为主要成分,添加不同比例的单一辅料(草炭、磷矿粉、粉煤灰)配成不同的城市污泥人工土壤,研究各配比人工土壤中重金属生物有效性和综合毒性,并揭示人工土壤中重金属向黑麦草的动态迁移.结果表明：各配比人工土壤中重金属生物有效性和综合毒性均较污泥明显下降；当粉煤灰添加比例为20%时,人工土壤中Cu、Zn、Pb、Ni生物有效态含量下降最多,分别为28.75%、36.09%、34.85%和36.52%,此时,重金属综合毒性指数降幅最大,为2.7×10-3；与污泥相比 ...
XUZhen-lan(许振岚), CHENHong(陈红)
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Research and application of heavy metal leaching of waste concretein Xiamen area [PDF]
, 2016 重金属是我国“十二五”规划中重点防控的污染物，重金属对环境和人体极具潜在的威胁，它不但不能被微生物分解，反而可以被生物体富集，或与某些阴离子（团）形成其他毒性更强的金属化合物。重金属在环境中将经历地质和生化双重循环迁移转化，并通过各种渠道（如大气、饮水、食物等）进入人体，这种摄取将对人体造成极大危害。重金属的过量能抑制生物酶的活性，影响人体正常的生物化学反应。重金属与人体蛋白质、核糖、激素等反应，形成金属络合物或螯合物，使其丧失或改变原来的生理化学功能而产生病变。 我国建筑产业飞速发展 ...
王振华
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Rare Metals, EarlyView.ABSTRACT The detection of volatile organic compounds (VOCs) holds significant implications in environmental monitoring and disease diagnosis. Traditional gas detection technologies are constrained by complex operation and high cost, thereby failing to satisfy real‐time detection demands.
Yuening Wang +11 more
wiley +1 more source
Shuitu Baochi Xuebao, 2007 为研究绿色无公害食品产地土壤重金属的含量与分布状况,以慈溪市周巷镇为研究区,利用综合指数法对土壤中重金属的含量进行评价,应用地统计学的方法分析土壤重金属含量的空间变化,并绘制土壤重金属的空间分布图。结果表明：以当地土壤重金属的自然背景为评价标准,所研究的8种重金属单项污染指数均大于1,说明8种重金属在该区均产生污染。以内梅罗指数法计算的土壤重金属综合污染指数为1.54,处于轻微污染的级别。研究区由北向南随地理位置和土地利用方式的不同,土壤中重金属含量有逐渐增高的趋势。不同剖面土壤重金属含量的研究表明 ...
刘庆 +4 more
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