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Yi, Wei-Min,Wang, Feige,Wu, Xue-Bing,Yang, Jinyi,Bai, Jin-Ming,Fan, Xiaohui,Brandt, William N.,Ho, Luis C.,Zuo, Wenwen,Kim, Minjin,Wang, Ran,Yang, Qian,Zhang, Ju-jia,Wang, Fang,Wang, Jian-Guo,Ai, Yanl IOP Publishing 2014 ASTROPHYSICAL JOURNAL LETTERS - Vol.795 No.2
<P>Very few of the z > 5 quasars discovered to date have been radio-loud, with radio-to-optical flux ratios (radio-loudness parameters) higher than 10. Here we report the discovery of an optically luminous radio-loud quasar, SDSS J013127.34-032100.1 (J0131-0321 in short), at z = 5.18 +/- 0.01 using the Lijiang 2.4 m and Magellan telescopes. J0131-0321 has a spectral energy distribution consistent with that of radio-loud quasars. With an i-band magnitude of 18.47 and a radio flux density of 33 mJy, its radio-loudness parameter is similar to 100. The optical and near-infrared spectra taken by Magellan enable us to estimate its bolometric luminosity to be L-bol similar to 1.1 x 10(48) erg s(-1), approximately 4.5 times greater than that of the most distant quasar known to date. The black hole mass of J0131-0321 is estimated to be 2.7 x 10(9) M-circle dot, with an uncertainty up to 0.4 dex. Detailed physical properties of this high-redshift, radio-loud, potentially super-Eddington quasar can be probed in the future with more dedicated and intensive follow-up observations using multi-wavelength facilities.</P>
Fully Recrystallized Al0.5CoCrFeNi High-Entropy Alloy Strengthened by Nanoscale Precipitates
Haoxue Yang,Jinshan Li,Tong Guo,William Yi Wang,Hongchao Kou,Jun Wang 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5
The correlation among the strength, ductility and precipitates in a dual-phase Al0.5CoCrFeNihigh-entropy alloy has beeninvestigated. The property of plastic was improved in the recrystallized Al0.5CoCrFeNiHEA prepared as the master alloy. Formation of the stable nanosized L12phases after aging at 650 °C was revealed, along with the lath-like BCC phasesprecipitated in the grain, as the primary contribution of the strength enhancement. Excellent balanced tensile properties atroom temperature were achieved through aging treatment, as the yield strength and ultimate tensile strength show 2.68, 1.63times higher in 650 °C/140 h aged condition than that in initial states, respectively, superior to many high-entropy alloysand conventional alloys.