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with that by SAROJ et al[3] and KHANNA et al[4]. It has been found that the five-fold symmetry is favored in the optimized structures. Five-fold symmetry structure starts with the seven-atom cluster, Ni7.... It is also found that there exists direct correlation between stability and geometrical structures of the clusters, and relatively higher symmetry clusters are more stable. From the results of the second......
楔形掏槽炮孔角度对称性对掏槽效果影响研究 楮怀保1,王以贤1,梁为民1,杨小林2 (1.河南理工大学;2.洛阳理工学院) 摘要:为了研究楔形掏槽炮孔角度对称性对掏槽爆破效果的影响,从理论上阐释了楔形掏槽爆破机理;并采用黑索金炸药对水泥砂浆试块完成了楔形掏槽对称性爆破相似模拟试验,综合评价分析了爆破形成的槽腔深度,体积和炮孔利用率等爆破效果.在潞安屯留煤矿南翼轨道大巷现场试验,循环进尺提高了11.5%.研究结果表明掏槽眼炮孔角度对称布置能够充分利用炸药的爆破能,增大爆破槽腔体积,增加槽腔深度,掏槽效果优于角度不对称情形,有利于提高掘进进尺,对隧道,巷道掘进施工具有参考意义. 关键词:掏槽......
properties of Ho3+-Yb3+ co-doped TiO2 nanocrystals were investigated. The upconversion luminescence of nanocrystals was enhanced with the reduction of the crystal lattice symmetry and the crystallinity improvement of the matrix, which were facilitated by the calcination temperature change and Li+ ions doping. The lowest lattice symmetry and the best crystallinity of the matrix resulted in the maximum......
with the lowest symmetry (C1) is the most stable. Linear isomers are not favored. Key words:computational chemistry; density functional theory; La2C2; structure; stability; rare earths; [全文内容正在添加中] ......
, COUSSEINS J C. Determination of the crystal structure of lithium hexafluoroterbate(2-) from X-ray and neutron powder diffraction: An example of lithium in five-fold coordination [J]. European Journal... spectroscopy is suitable for detection/approval of lowered local symmetry via significant splitting of spectral bands. Key words: molten salts; rapidly cooled molten system; SmF3; GdF3; absorption......
, the head light area was projected and the symmetry axis was obtained by one-dimensional function symmetry detection method, and then the initial segmentation result was received based..., 2014, 36(9): 2041-2046. XIAO Zhitao, SHI Wenjing, GENG Lei, et al. Symmetry detection based on phase information and principal component analysis[J]. Journal of Electronics & Information......
+ substituting for Ce4+ ions in the lattice with a cubic symmetry, ones in defect with a noncubic symmetry, and at the surface of samples.关键词:......
in local symmetry,which is related to disordered atoms that are induced by size effects in SBT nanoparticles.关键词:......
新型除草剂2.5%稻杰的有效成分测定-高效液相色谱法吕刚1,王利兵2,罗璇1,刘军11. 天津出入境检验检疫局2. 湖南出入境检验检疫局摘 要:采用高效液相色谱测定了新型除草剂2.5%稻杰(FENCER)的有效成分,用外标法进行定量分析.条件为:Waters Symmetry C8色谱柱;流动相包括V(乙腈)∶V(水)∶V(1%H3PO4=60∶40∶0.1;检测波长为285 nm;流速为1.0 mL/min,柱温为室温;进样量为10μL;实验结果表明,样品平均回收率为98%,精密度为0.13%.关键词:2.5%稻杰;除草剂;高效液相色谱法;......