Results 21 to 30 of about 17,337 (198)
, 2004 2004年4月1日，韩国高速铁路KTX(Korea Train eXpress)在京釜线(汉城釜山)、湖南线(汉城-木浦)同时开通。这标志着韩国正式跨入高速铁路时代，继日本、法国、德国和两班牙之后，成为建设时速300km高速铁路的第5个国家。这个被称为“陆地交通的革命和自檀君以来最大的国策事业”的工程，于1992年6月破土动工 ...
金哲学
core +2 more sources
Effect of Slag with Different Alkalinity on Sulfide in 42CrMoS4 Steel [PDF]
TeshugangIn order to study the influence of different refining processes on sulfides in ring gear steel 42CrMoS4 steel， starting from the morphology and distribution of sulfides in the steel， two different alkalinity slag and calcium content processes were ...
Wang Xuji, Pan Xiquan, Yang Genchao, Huang Zhenhua
doaj +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2007 讨论了以TAN为衍生试剂，用Triton X-114非离子表面活性剂浊点萃取富集铁（Ⅱ )、钴（Ⅱ )、镍（Ⅱ )的各种条件，并于ODS柱上，用内含4.5 m mol • L-1十六烷基三甲基溴化铵(CTMAB)和0.03 mol • L-1 pH5.5HAc-NaAc缓冲溶液的甲醇/水溶液（体积比为69 ： 31）作流动相，检测波长为565 nm，流速为0.8 mL • min-1，发展了浊点萃取-高效液相色谱法测定铁、钴、镍的新方法.在选定条件下，大多数离子不干扰测定，方法灵敏度高，对铁、钴 ...
XIEXia-feng(谢夏丰) +2 more
doaj +1 more source
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Vanadium‐bearing solid wastes (VBSWs) have emerged as a key research priority in resource recovery and environmental remediation because of their high resource value, large generation volume, and complex phase composition. However, practical utilization of these wastes still faces major challenges, including heavy environmental burdens, ill ...
Bowen Duan +7 more
wiley +1 more source
Enhanced Oxygen Reduction Reaction Performance of Fe‐N4 Single‐Atom Catalysts Through Fe3C Coupling
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Understanding the electronic factors contributing to the high oxygen reduction reaction (ORR) activity of Fe‐N4 sites remains a significant challenge due to the localized Fe 3d orbitals and their sensitivity to the coordination environment.
Shichang Cai +19 more
wiley +1 more source
甘氨酸修饰大孔纤维素微球的制备及其对Cr3+、Fe3+的吸附研究
Gongye shui chuli, 2011 以碳酸钙固体颗粒为致孔剂，采用热熔胶转化再生纤维素法制备了大孔纤维素微球，并用甘氨酸修饰成阳离子吸附剂，以Cr3+、Fe3+为模型组分考察了该新型吸附剂的吸附性能。采用扫描电子显微镜对吸附剂的结构性能进行了表征，并探讨了吸附时间、初始浓度、温度、pH 对吸附性能的影响。结果表明，吸附在270 min 达到平衡，对Cr3+、Fe3+的饱和吸附量分别为52.5、48.9 mg/g，吸附过程可用Freundlich 等温方程拟合。
李江 +4 more
doaj +2 more sources
Electrically Switchable Altermagnetism in Monolayer MoCl3
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Altermagnets intertwine spin‐split bands with vanishing net magnetization, offering great potential for high‐density, stray‐field‐free spintronic devices. However, their development is hindered by both material scarcity and difficulties in external control due to their intrinsic symmetry protection.
Zhengming Zhang, Zhenyu Fan, Dunhui Wang
wiley +1 more source
Gongye shui chuli, 2003 提出一种用磺基水杨酸作显色剂测定循环水中铁的新方法, 试验结果表明:此方法的标准偏差小于3.0%, 相对标准偏差小于5.0%, 加标回收率为99%～102%;此方法所用仪器简单、所需药剂较少、简便快速, 具有较高的准确性, 可在生产实际中应用。
刘群, 余伟明
doaj +2 more sources