N. K. Renuka
,
K. Anas
,
C. U. Aniz
催化学报
doi:10.1016/S1872-2067(15)60894-4
将V2O5, CeO2和CuO分散到提取自稻米壳的SBA-16上,考察了其催化CO氧化反应活性,并采用X射线衍射、扫描电镜、透射电镜、程序升温还原和紫外漫反射光谱对所制催化剂进行了表征。结果表明,掺杂CuO的介孔氧化硅是一种有前景的催化剂,其CO转化率可达98%以上。
关键词:
稻米壳灰
,
介孔氧化硅
,
SBA-16
,
金属氧化物催化剂
,
一氧化碳氧化
郑劼
,
朱霞萍
,
李品
,
白德奎
,
李铭
功能材料
doi:10.3969/j.issn.1001-9731.2016.09.045
共沉淀法制备了C u-Mg-A l层状超分子化合物,X 射线衍射图谱和热重分析表征了材料的结构,并研究了材料对溶液中碘离子的吸附去除性能.制备的材料为具有层状结构的 C u-Mg-A l 的超分子化合物,具有结构“记忆效应”,层间可以吸附碘,层板上的铜对碘也有特异化学作用,增强材料对碘的吸附能力.在优化制备和吸附条件下,Cu-Mg-Al层状超分子化合物对碘离子的饱和吸附量为279.15 mg/g,远高于普通层状氢氧化镁铝的66.61 mg/g.材料可作为碘及放射性碘污染的吸附去除剂.
关键词:
层状金属氢氧化物
,
超分子
,
铜
,
碘
,
去除
Computer Physics Communications
Based on a detailed check of the LDA + U and GGA + U corrected methods, we found that the transition energy levels depend almost linearly on the effective U parameter. GGA + U seems to be better than LDA + U, with effective U parameter of about 5.0 eV. However, though the results between LDA and GGA are very different before correction, the corrected transition energy levels spread less than 0.3 eV. These more or less consistent results indicate the necessity and validity of LDA + U and GGA + U correction. (C) 2012 Elsevier B.V. All rights reserved.
关键词:
Band-gap problems;LDA plus U and GGA plus U;ZnO;First-principles;augmented-wave method
Journal of Materials Research
The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.
关键词:
room-temperature
XIE Guoqiang
,
YANG Jijian
,
ZHANG Baisheng
,
LI Wendan(China Institute of Atomic Energy
,
Beijing) Manuscript received 13 December 1994
金属学报(英文版)
U—10wt%Zr alloy has been analysed by neutron diffraction method to determine the constituent phases and their crystal structures.The collected diffraction data are processed using Rietveld' s profile technique (with program“ Fullprof ”). Four phases,α-U,δ, γand α—Zr, in the alloy at room temperature and the corresponding volume fractions as well their structural parameters are obtained from the data analysis, For the δ-phase, a partially ordered unusual hexagonal structure of the modified C32(AlB2) type is confirmed.
关键词:
:U-10wt%Zr alloy
,
null
,
null
孙海宁
,
王菊芳
,
马爽
,
陆栋
,
吴鑫
,
李文建
原子核物理评论
以粘红酵母菌Rhodotorula glutinis A Y 91015为材料,研究了不同传能线密度(LET)的C离子对粘红酵母菌的失活截面和突变截面,评估了不同LET的C离子对微生物的失活效应和突变效应.结果表明,C离子LET为120.0 keV/tim时,单个粒子对粘红酵母菌的失活截面最大,为4.37 um2,接近酵母菌细胞核的平均核截面;LET为96.0 keV/μm时,单个粒子对粘红酵母菌的突变截面最大.通过对C离子束致突变能力的分析发现,C离子在LET为58.2 keV/μm时突变能力最强,这一结果显示在经C离子辐照后存活下来的粘红酵母菌中,可以引起有效突变的最佳LET为58.2 keV/μm左右,此时所对应的碳离子能量约为35 MeV/u.这些结果表明,C离子对粘红酵母菌的最佳致死效应和最佳致突变效应存在于不同的能量区域.
关键词:
C离子
,
传能线密度
,
失活效应
,
突变效应
,
粘红酵母菌