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Yujie Zhang,Zhihang Guo,Yimin Gong,Jianzhong Shi,Mohamed Hechmi El Ouni,Farhan Alhosny Techno-Press 2023 Advances in nano research Vol.15 No.2
The under-evaluation structure includes a functionally graded porous (FGP) core which is confined by two piezoelectric carbon nanotubes reinforced composite (CNTRC) layers. The whole structure rests on the Pasternak foundation. Using quasi-3D hyperbolic shear deformation theory, governing equations of a sandwich plate are driven. Moreover, face sheets are subjected to the electric field and the whole model is under thermal loading. The properties of all layers alter continuously along with thickness direction due to the CNTs and pores distributions. By conducting the current study, the results emerged in detail to assess the effects of different parameters on buckling of structure. As instance, it is revealed that highest and lowest critical buckling load and consequently stiffness, is due to the V-A and A-V CNTs dispersion type, respectively. Furthermore, it is revealed that by porosity coefficient enhancement, critical buckling load and consequently, stiffness reduces dramatically. Current paper results can be used in various high-tech industries as aerospace factories.
Purification and Characterization of Novel Manganese Peroxidase from Rhizoctonia sp. SYBC-M3
Yujie Cai,Huiguang Wu,Xiangru Liao,Yanrui Ding,Jun Sun,Dabing Zhang 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.6
A novel manganese peroxidase of Rhizoctonia sp. SYBC-M3 (R-MnP) was purified by (NH4)2SO4fractionation, DEAE-cellulose-32 column chromatography,and Sephadex G100 column chromatography. The molecular mass of R-MnP was determined to be approximately 40.4 kDa by SDS-PAGE. The optimum temperature and pH for R-MnP were 55°C and 4.5, respectively. R-MnP was highly stability when the temperature was below 50°C. R-MnP could retain about 60% of its activity when the pH was between 4 and 6.5. However, R-MnP activity was inhibited by Fe3+, Cu2+, and Co3+ as well as increased by Zn2+ and Ca2+. R-MnP demonstrated oxidation of DMP,ABTS, veratryl alcohol, and guaiacol. The Km values of RMnP for H2O2 and Mn2+ were 25.3 and 53.9 μmol/L,respectively.
Effect of Al doping on the magnetic properties of Sr0.1Ca0.6La0.3AlxFe12-xO19 hexaferrite magnets
Yujie Yang 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.7
Al substituted M-type hexaferrite samples, Sr0.1Ca0.6La0.3AlxFe12-xO19 (0 ≤ x ≤ 1.4), were synthesized by the ceramic process. The X-ray diffraction (XRD) was used to examine the phase composition of the magnetic powders. The XRD patterns of themagnetic powders at Al content (x) ≤ 0.8 show the M-type strontium hexaferrite phase with α-Fe2O3 as a second phase. At Alcontent (x) ≥ 1.0, there are single magnetoplumbite phase patterns. The images of the M-type hexaferrite magnets wereobserved by a field emission scanning electron microscopy (FE-SEM). The grain particles of the magnets are hexagonalplatelet-like shape, and the grain size decreases with the increase of Al concentration (x). A permanent magnetic measuringsystem was used to measure the magnetic properties of the magnets. The remanence (Br) decreases with Al content (x) from0 to 1.4. The intrinsic coercivity (Hcj) increases with Al content (x) from 0 to 1.4. While the magnetic induction coercivity (Hcb)first increases with Al content (x) from 0 to 0.6 and then decreases at Al content (x) ≥ 0.6.
Yujie Yang,Fanhou Wang,Juxiang Shao,Qilong Cao 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6
Hexagonal ferrites Sr1-xLaxFe11.80Cu0.20O19 magnetic powders and magnets were prepared by the solid state reaction. The phasecompositions of the magnetic powders were identified by X-ray diffraction. There is a single magnetoplumbite phase in themagnetic powders with x from 0.12 to 0.32, and for the magnetic powders with x ≥ 0.36, the LaFeO3 phase is observed. Themicrostructures of the magnets were investigated by a field emission scanning electron microscopy. The magnets are formedof hexagonal-shaped crystals and the particles are distributed homogeneously. The magnetic properties of the magnets weremeasured by a magnetic properties test instrument. The remanence of the magnets increases with x from 0.12 to 0.40. However,the intrinsic coercivity, magnetic induction coercivity and maximum energy product of the magnets first increase with x from0.12 to 0.24, and then begin to decrease when x continues to increase.
News-driven Business Cycles: Evidence from Investors’ Expectations of Future Stock Market Returns
( Yujie Zhang ),( Deokwoo Nam ) 한양대학교 경제연구소 2022 JOURNAL OF ECONOMIC RESEARCH Vol.27 No.1
This paper uses a time series of investors’ expectations of future stock market returns, which is proposed by Greenwood and Shleifer (2014), as a new proxy for expectations of future economic developments. Incorporating this measure of expectations into otherwise standard VAR models and implementing the approach of sign restrictions to identify news shocks, we provide empirical evidence in favor of the news-driven business cycles hypothesis. New shocks identified by exploiting movements in the measure of investors’ expectations are found to induce a generalized boom of the economy that is associated with delayed and permanent increases in total factor productivity, but not with its current improvements.
Yujie Yang 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.2
A series of Mn substituted M-type hexaferrites having the chemical compositions of Sr0.75La0.25Fe12.00-xMnxO19 (where 0.00 ≤x ≤ 0.60) were prepared by the conventional ceramic processing method. X-ray diffraction (XRD) was used to evaluate thehexagonal phase evolution for the M-type hexaferrite magnetic powders. The XRD results show that Mn3+ ions completelyenter into the hexaferrite structure and all magnetic powders show M-type hexagonal structure. Magnetic properties of thepowders were studied by a physical property measurement system-vibrating sample magnetometer (PPMS-VSM). Thesaturation magnetization (Ms) and remanent magnetization (Mr) first slightly increase with Mn content (x) from 0.00 to 0.24,and then decrease with Mn content (x) form 0.24 to 0.60. The coercivity (Hc) of the magnetic powders first increases with Mncontent (x) from 0.00 to 0.12, and then decrease with Mn content (x) form 0.12 to 0.36, and increases with the increase of Mncontent (x) when Mn content (x) ≥ 0.36.
Yujie Yang 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.7
M-type hexaferrites with nominal composition of Ca0.4Sr0.6-x(La0.8Pr0.2)xFe12-yCoyO19 (0.00 ≤ x ≤ 0.50, 0.00 ≤ y ≤ 0.40) wereprepared by the solid-state reaction method. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM)and a permanent magnetic measuring system were used to investigate the microstructural and magnetic properties of the Mtypehexaferrites. All the LaPr-Co substituted M-type hexaferrites are in single-phase with hexagonal structure and noimpurity phase is observed in the structure. The FE-SEM images of the magnets show that the grains are hexagonal plateletlike,and the grain size of the magnets basically keeps unchanged with increasing LaPr-Co content. The remanence (Br), firstdecreases, and reaches to the minimum value at x = 0.20, y = 0.16, and then increases with the increasing substitution contentof LaPr (0.20 ≤ x ≤ 0.50) and Co (0.16 ≤ y ≤ 0.40). The intrinsic coercivity (Hcj) increases with the increase of LaPr-Co content(0.00 ≤ x ≤ 0.40, 0.00 ≤ y ≤ 0.32), and then decreases with the increasing substitution content of LaPr (0.40 ≤ x ≤ 0.50) and Co(0.32 ≤ y ≤ 0.40). Magnetic induction coercivity (Hcb) and maximum energy product [(BH)max] increase with increasing LaPrCocontent (0.00 ≤ x ≤ 0.50, 0.00 ≤ y ≤ 0.40).
Yujie Yang 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.5
In this study, we have prepared the M-type Ca-Sr hexaferrites with composition of Ca0.2Sr0.8Fe12.0-xNixO19 (0.0 ≤ x ≤ 0.8) by thesolid-state reactions. The phase compositions of the samples were confirmed by X-ray diffraction analysis. The results of Xraydiffraction patterns show that for the M-type hexaferrite magnetic powders with the Ni content (x) from 0.0 to 0.4, theXRD patterns belong to the M-type strontium hexaferrite; when Ni content (x) ≥ 0.6, Sr4Fe6O13 is detected. It is observed thatlattice parameter c first increases with the increase of Ni content (x) from 0 to 0.4, and then decreases when Ni content (x) ≥0.4, while lattice parameter a basically keeps constant. Magnetization properties were measured at room temperature by apermanent magnetic measuring system. The remanence (Br) first increases with increasing Ni content (x) from 0.0 to 0.2, andthen decreases when Ni content (x) ≥ 0.2. The the intrinsic coercivity (Hcj), magnetic induction coercivity (Hcb) and maximumenergy product [(BH)max] decrease with the increase of Ni content (x) from 0.0 to 0.8.