Results 61 to 70 of about 442 (114)
综述了近年来稀土掺杂氧化锌压敏瓷中的研究进展。掺杂稀土氧化物可明显的减小ZnO晶粒尺寸,使晶粒尺寸分布均匀;其中掺杂Y2O3可使ZnO-Bi2O3系压敏瓷晶粒尺寸由11.3μm降到5.4μm,掺杂Er2O3使晶粒尺寸由1.60μm减小到1.06μm。显著提高了ZnO压敏瓷的电位梯度、降低了漏电流。其中在ZnO-Bi2O3系压敏瓷中掺杂Y2O3,可获得电位梯度约为270 V/mm、漏电流为3μA、压比为1.66的电阻片,在ZnO-PrA6O11系压敏瓷中掺杂Er2O3,电位梯度可提高到416.3 V/mm,
巫欣欣 +4 more
doaj
Potential Clinical Risk of Inflammation and Toxicity from Rare-Earth Nanoparticles in Mice. [PDF]
Chen JP +8 more
europepmc +1 more source
冠醚对碱金属和碱土金属已显示出独特的配位性能,其与稀土和锕系元素的配合物也有不少报道.但冠醚与过渡金属钴(Ⅱ)形成配合物[1~3]的研究较少.在萃取研究方面,Navratil等[4]用冠醚从过氯酸体系萃取钴(Ⅱ)时,发现用18 冠 6较好;Rusdi...
陈明生, 周继萌, 许盛昌
doaj
为确定冲刷条件下冻融坡面侵蚀产沙时空分布特征,利用稀土元素(REE)示踪技术,采用2个坡度(10°,15°),4个初始解冻深度(2,5,10,15 cm),4个流量(4.5,6.5,8.5,10.5 L/min)进行径流小区冲刷试验,分析冻融坡面侵蚀产沙时空变化规律。结果表明:相同初始解冻深度条件下土壤侵蚀产沙量随着坡度和流量的增大而增大,坡面第1坡段发生侵蚀最大,占总产沙量的68.24%,第3坡段产沙量一直趋于平稳状态;坡度相同时,侵蚀产沙量随着起始解冻深度和流量的增大而增大 ...
张 凯, 王 瑄, 周丽丽, 鲍永雪
doaj
[Latest research progress of rare earth-magnesium alloys in orthopedics]. [PDF]
Sun Z, Zuo K, Zhu X, Yue H, Gao Z.
europepmc +1 more source
[Preface for Special Issue on New Materials for Chromatographic Separation]. [PDF]
Qiu HD, Chen J.
europepmc +1 more source
[Applications and prospects of biodegradable rare earth magnesium alloys as bone implant materials]. [PDF]
Yue H, Zhu X, Gao Z, Sun Z.
europepmc +1 more source
[Determination of 26 herbicide residues in soil, sediment, and surface water samples using modified QuEChERS method combined with ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Zhao L, Ma L, Huang LQ, Chen JB, Zhu WF.
europepmc +1 more source

