Results 41 to 50 of about 5,336 (213)
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
doaj +2 more sources
野生动物学报, 2009 2008年4月,陕西汉中朱鹮国家级自然保护区人工饲养的1只朱鹮背部羽毛严重缺失,病变部位绒羽脱落,片羽羽干质脆易断,中下部羽丝缺失,在距皮肤0.3～0.5cm处折断脱落。实验室诊断发现血液中微量元素锌含量较低,通过补充微量元素锌进行治疗,取得了较好的治疗效果。
庆保平, 翟天庆, 丁海华, 闫鲁
doaj
Investigation of Plasmon-Enhanced Second-Harmonic Generation (PESHG) [PDF]
, 2016 等离激元增强二次谐波效应（Plasmon-EnhancedSecond-HarmonicGeneration，PESHG）由于其展现出了对于近场耦合效应、结构形貌变化等空间变化信息的极高检测灵敏度和空间分辨能力，因而在超空间分辨技术、高效的非线性光学转换器件、全光调制和转换以及超材料等研究领域受到越来越多研究者的关注。尽管PESHG的研究在近年来取得了很大的进步，但依然存在着许多重大的科学问题尚待解决。比如在具体的实验研究中如何引入PESHG对纳米尺度变化进行超高空间分辨表征及分析 ...
沈少鑫
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Psicologia USP, 2006 O artigo analisa a influência das concepções tradicionais da Psicologia nas falas de educadores e alunos sobre o fracasso escolar na atualidade. Para tanto, faz uma breve revisão da psicometria e da teoria da carência cultural como representantes da concepção ideológica que centra no indivíduo e no "ambiente" as causas do fracasso.
Asbahr, Flávia da Silva Ferreira +1 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The sluggish kinetics of the oxygen reduction reaction (ORR) necessitate developing oxygen electrodes with enhanced electrocatalytic activity for practical zinc–air battery applications. In this study, an iron‐doped copper sulfide electrocatalyst (CuFeNS‐PNC) anchored on metal–organic framework‐derived carbon substrates was designed, featuring
Taichong Chitboonyakasem +4 more
wiley +1 more source
One-Step Production of Liquid Hydrocarbons from Polyols by Reduction with Hydroiodic Acid [PDF]
, 2015 为实现社会的可持续发展，寻找一种环境友好的可再生资源成为人类社会发展中的一个重大课题。生物质作为一种能够替代传统化石能源的可再生资源，逐渐受到国际社会的重视。以制取液体燃料为目的的生物质转化技术具有广阔的应用前景，是解决国家能源安全问题的一个重要途径。将生物质资源转化为液体燃料油是生物质替代传统化石能源的重要形式之一。整合生物炼制过程，以生物质基多元醇为原料制备可再生液体燃料，通过采用精心设计的工艺路线，在环保节能的前提下实现更高水平的生物质利用与转化，对于解决能源问题和环境保护方面具有重要的意义 ...
吕东灿
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Sociologias Plurais, 2012 Comumente, em referência a atletas de futebol, evoca-se uma masculinidade tradicional (BONINO, 2008), definida como modelo social hegemônico. No presente artigo, refletir-se-á sobre a chamada "área reservada masculina" (MAGUIRE & DUNNING, 1997), considerada como relevante à manutenção das estruturas patriarcais. A partir de coberturas jornalísticas
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Low conductivity and poor oxygen reduction reaction (ORR) catalytic activity limit the bifunctional catalytic performance of layered double hydroxide (LDH) in zinc–air batteries. In this work, an efficient bifunctional electrocatalyst was prepared by loading nitrogen and phosphorus co‐doped carbon quantum dots (NPCQDs) onto a cationic‐vacancy ...
Wenhao Tang +4 more
wiley +1 more source
Synthesis of Ⅱ-Ⅵ(ZnO,CdSe) nanostructured materials and its application as photodetector [PDF]
, 2015 本文的研究内容主要分为两个部分：一ZnO纳米材料的制备及其在光电探测领域内的应用；二基于CdSe材料的光电导探测器的研制。 PartAZnO纳米材料的制备及其在光电探测领域内的应用 本部分的研究工作与成果如下： 一:研究不同激光能量密度的248nm脉冲激光对ZnO材料的影响，发现随着能量密度的增加，制备的ZnO薄膜材料的结构发生变化，当能量密度达到2.5J/cm2时，ZnO薄膜变成纳米片结构材料，其原因可能是来自高能量密度激光产生的非线性效应。 二 ...
徐强
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Porous Mn2O3@C Cathode With High Activity and Long Lifespan for Aqueous Zinc Ion Batteries
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Manganese‐based oxides are widely employed as cathode materials for aqueous zinc ion batteries (AZIBs) due to their low toxicity and high theoretical specific capacity. However, their inherent poor electrical conductivity, coupled with the dissolution of manganese into the electrolyte, often leads to structural degradation of the cathode.
Cheng‐Jie Yin +5 more
wiley +1 more source