共搜索到1297条信息,每页显示10条信息,共130页。用时:0小时0分0秒671毫秒
of Na doping on structure and magnetic entropy of perovskite La0.7Sr0.3-xNaxMnO3 doped with Na+ QI Shu-yan, MA Cheng-guo, DONG Li-min, HAN Zhi-dong, ZHANG Xian-you (School of Materials..., the maximal magnetic entropy around TC decreases with increasing x values, which can be induced to the tolerance factor decrease, crystal lattice shrink and ferromagnetic coupling decrease. Key......
, and the nature frequency was obtained through principle of Fourier transform and maximum entropy spectrum method. The result of modal analysis was chosen in actual measurement. The results show that the model... analysis in the maximal entropy spectrum method of the damped free vibration waveform of the subgrade. Key words: transition section; subgrade; natural frequency; modal; the maximum entropy spectrum 随着我国高速铁路......
Engineering, Central South University, Changsha 410075, China) Abstract: Based on the evaluation index system of secondary environment impacts of urban rail transit, and with the theory of entropy and matter elements, an comprehensive extension evaluation method was established based on the entropy weight. By calculating its comprehensive interrelatedness, the rank of quality evaluation of the secondary......
Trans. Nonferrous Met. Soc. China 31(2021) 2415-2427 Effect of nitrogen on microstructure and mechanical properties of CrMnFeVTi6 high entropy alloy Lin ZHANG1, Ruo-kang SONG2, Guo-xin QU2... 100028, China Received 1 September 2020; accepted 28 June 2021 Abstract: In order to evaluate interstitial strengthening effect on the properties of high entropy alloy (HEA), a nitrogen-doped CrMnFeVTi6......
;高熵合金涂层;显微硬度;耐腐蚀性 文章编号:1004-0609(2018)-09-1784-07 中图分类号:TG174.4 文献标志码:A 高熵效应使高熵合金(High entropy alloy,简称HEA)具备了高强度,高硬度,耐高温,耐腐蚀及高耐磨性等优异性能,而HEA涂层也具备这些性能..., CHAO Su-quan. Research progress of high entropy alloy coatings[J]. Materials Protection, 2015, 48(4): 44-46. [2] 张春华, 单丽娜, 吴臣亮, 张 松, 关 锰, 谭俊哲. Cu单元素基合金表面FeCoCrAlCu激光高熵合金化涂层的制备[J].中国有色金属学报, 2015, 25(5......
Trans. Nonferrous Met. Soc. China 31(2021) 744-752 Self-lubricating behavior of Fe22Co26Cr20Ni22Ta10 high-entropy alloy matrix composites Wei-cheng XIAO, Kun LI, Liu-liu HAN, Yong LIU State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China Received 8 May 2020; accepted 5 November 2020 Abstract: Eutectic high entropy alloys (EHEAs) have high temperature......
of orthogonal test design and entropy weight decision, the sensitivity analysis of parameters of the lenticle was performed. It has been found that the vertical position and the area ratios of lenticles... is. In addition, it is suggested that the displacement of dam crest and the safety factor should be all considered to evaluate the safety of dam. Key words: lenticle; sensitivity analysis; entropy......
J. Cent. South Univ. (2016) 23: 1990-2000 DOI: 10.1007/s11771-016-3256-0 A variation pixels identification method based on kernel spatial attraction model and local entropy for robust endmember.... The variation index is proportional to pixels local entropy but inversely proportional to pixels kernel spatial attraction. The number of pixels removed was modulated by an artificial threshold factor α......
transition and enhances the magnetic entropy change, although Tb substitution decreases the Curie temperature (TC) of the compounds. The magnetic entropy change of (Gd1-xTbx)5Si1.72Ge2.28 alloys retains a large value in the low magnetic field of 1.0 T. The maximum magnetic entropy change for (Gd0.80Tb0.20)5Si1.72Ge2.28 alloy in the magnetic field from 0 to 1.0 T reaches 8.7 J/(kg?K), which is nearly......
evaluation factor was built, the quantitative analysis and the calculation of information entropy in weight of each index was conducted, and the evaluation results of tailings reservoir dam-break... measurement; information entropy 我国是矿业大国,冶金,有色,化工,核工业,建材和轻工业等行业的矿山都有尾矿设施.我国现有尾矿库12 655座,尾矿堆积量达80亿t[1].尾矿除一部分可作为建筑材料,充填矿山采空区以及用于海岸造地等外,绝大部分需要妥善储存在尾矿库内.筑坝拦截谷口或围地构成的,用以贮存金属和非金属矿山进行矿石选别后排出尾矿或其他工业废渣的场所称为尾矿库.尾矿库是一个......