Results 41 to 50 of about 13,629 (214)
野生动物学报, 2008 目的:通过对9只来自野外和园内养大的云豹毛中锌、铜、铁、钙4种元素检测,了解云豹对这4种元素代谢特点与产生脱毛症的关系。方法:从云豹尾部的上1/3处采毛,用原子吸收光谱法检测。结果:在所检测的9只云豹中,其中3只患脱毛症的云豹毛中铜元素含量都低于4.4μg/g,其他3种元素所测结果表明与脱毛症均没有直接关系。结论:铜元素缺乏可能与云豹患脱毛症关系密切。
马再玉 +3 more
doaj
High‐Value Targeted Conversion of Copper Slag as LiFePO4 Material for Lithium‐Ion Batteries
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The massive stockpiling of copper slag (CS) presents severe environmental and resource‐waste challenges. Existing strategies for CS valorization typically yield low‐value‐added products. Herein, we propose an innovative hierarchical regulation approach to transform CS into high‐performance LiFePO4 (LFP) cathode materials.
Yuyun Li +5 more
wiley +1 more source
四川大学学报. 自然科学版, 2009 在密度泛函(DFT)理论的框架内,我们利用平面波赝势及准谐德拜模型研究了六角结构铁的磁性,热力学性质和融化曲线.磁性对六角结构铁的影响较大,影响的压力范围从 OGPa 到72.9 GPa.利用准谐德拜模型,很好的得到了热胀系数,体模量随压力和温度的关系.计算得到的晶格热容,熵与德拜温度的数据与实验值符合较好.利用 Lindemann 熔化定律,得到了六角铁在地核压力范围内的熔化曲线.在地核压力(约330 GPa)下,铁的熔化温度为6160K.
傅敏, 胡翠娥, 曾召益, 刘中利
doaj
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Metal oxide‐based catalysts for oxygen reduction reaction (ORR) have drawn great attention in recent years. However, it remains technically challenging for the precise regulation of the overall performance due to the trade‐off effect among the activity, selectivity, and stability of electrocatalysts. Herein, a balancing strategy to control the
Haoran Ma +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The pre‐existing α‐Fe crystals have important effects on the precipitation and growth of nanocrystals and finally determine the comprehensive soft magnetic properties (SMPs) of the nanocrystalline alloys (NAs). In this work, a high content of Cu elements has been added to Nanomet‐type alloys to enhance the gradient heterogeneity in order to ...
Lei Xie +6 more
wiley +1 more source
, 2016 对铬铁酸浸液除铁所得草酸亚铁进行氧气氧化?氨浸处理,回收除铁剂草酸盐并用其制备氧化铁黑颜料.考察了氨水用量、反应温度、液固比、反应时间、氧气流量、反应液p H值及晶化温度等对C2O42?浸出率和氧化铁黑质量的影响.结果表明,反应液经60℃晶化处理后,在反应温度80℃、氨水与草酸亚铁摩尔比为3、液固比5 m L/g、氧气流量0.1 L/min、p H值6.9?7.4、反应时间3 h的条件下,C2O42?的浸出接近100%,得到的氧化铁黑质量与国产722氧化铁黑产品相当.
张洋 +4 more
core
Gongye shui chuli, 2007 针对太湖区地表水源水铁、锰含量高的问题, 选择高锰酸盐、二氧化氯和过氧化氢三种预氧化剂对其进行除铁、锰的预处理。试验结果表明:高锰酸盐投加质量浓度为0.45 mg/L时, 铁、锰的去除率分别为75%、85%, 制水成本增加0.007元/t, 采用二氧化氯预处理, 其投加质量浓度为1.5 mg/L时, 铁、锰的去除率分别为75%、79%, 制水成本增加0.093元/t, 而过氧化氢投加质量浓度4 mg/L时, 铁、锰的去除率分别为66.7%、41.7%, 在最佳投量下, 过氧化氢增加制水成本为0.12元 ...
孙士权 +4 more
doaj
Discursos Fotograficos, 2014 Resenha de: SILVA, Mylton Severiano da. Realidade - História da revista que virou lenda. Florianópolis: Editora Insular, 2013. 320 p.
openaire +3 more sources
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT A comparative study was performed to elucidate the temperature‐dependent corrosion kinetics and the semiconductor/structural characteristics of the passive film formed on Fe40Ni7Cr17Mo12C13B9Y2 (at%) amorphous alloy coatings. The results indicate that increasing temperature accelerates the corrosion kinetics of the coating.
Yang Lv +12 more
wiley +1 more source
, 1981 本工作对钒钛磁铁矿中三种精矿粉的物相组成及还原过程进行了研究。 A、B二铁精矿的主要物相组成为磁铁矿和钛铁矿,其中网格状显微结构是钛铁晶石的氧化产物——钛铁矿和磁铁矿。在500～800℃温度范围内观察到钛铁晶石在还原过程中经过钛铁矿。钛铁矿在还原过程中若有过剩的氧化铁存在,也经过钛铁晶石。粗粒钛铁矿经过预氧化可显著改善其还原性。B矿在600 ...
石笙陶, 储绍彬
core