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ANALYSIS OF HIGH - FIELD MAGNETIZATION PROCESS IN Sm₂Fe17N3.0
T. S. Zhao,H. M. Jin,J. I. Lee,K. S. Pang 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
The observed high-field magnetization curves of Sm₂Fe_(17)N_(3.0) at 4.2 K and 296 K are well reproduced by the calculation using the Sm-Fe exchange field 2_(μB)Hex = 320 K and two crystalline electric field parameters A²_0 = -910 K and A^0_1 = 200 K. The calculation shows that during the magnetization process along the hard axis at 4.2 K, the Sm moment rotates toward the direction anti parallel to H when H < 110 kOe and then returns to the field direction with further increase of the field. At 296 K, the Sm moment rotates toward the direction antiparallel to H monotonously with increasing field and finally becomes antiparallel to H when H ≥ H_A = 210 kOe. The particular magnetization process of the Sm moment can be explained by the field-induced noncollinear coupling between the spin and orbital moments of the Sm ion.
Chemical composition of giants from two moving groups
Liu, F.,Chen, Y. Q.,Zhao, G.,Han, I.,Lee, B. C.,Kim, K. M.,Zhao, Z. S. Blackwell Publishing Ltd 2012 Monthly notices of the Royal Astronomical Society Vol.422 No.4
<P><B>ABSTRACT</B></P><P>We present the stellar parameters of 19 K‐type giants and their abundances for 13 chemical elements (Al, Ba, Ca, Fe, K, Mg, Mn, Na, Ni, Sc, Si, Ti and V), selected from two moving groups, covering the metallicity range of −0.6 < [Fe/H] < 0.2, based on high‐resolution spectra. Most of the elemental abundances show similar trends as in previous studies, except for Al, Na and Ba, which are seriously affected by evolution. The abundance ratios of [Na/Mg] increase smoothly with higher [Mg/H], and those of [Al/Mg] decrease slightly with increasing [Mg/H]. The abundance ratios of [Mg/Ba] show a distinction between these two moving groups, which is mainly induced by chemical evolution and also partly by kinematic effects. The inhomogeneous metallicity of each star from the moving groups demonstrates that these stars had different chemical origins before they were kinematically aggregated. This favours a dynamical resonant theory.</P>
Chu, X.Z.,Cheng, Z.P.,Xiang, X.X.,Xu, J.M.,Zhao, Y.J.,Zhang, W.G.,Lv, J.S.,Zhou, Y.P.,Zhou, L.,Moon, D.K.,Lee, C.H. Pergamon Press ; Elsevier Science Ltd 2014 International journal of hydrogen energy Vol.39 No.9
The separation of a hydrogen isotope mixture on porous materials was studied using equilibrium and breakthrough experiments. The adsorption equilibria of H<SUB>2</SUB> and D<SUB>2</SUB> on SBA-15 with mesopores and molecular sieves 5A, Y, and 10X with micropores were measured at 77 K using the volumetric method. The breakthrough experiments of a H<SUB>2</SUB> and D<SUB>2</SUB> mixture in each adsorbent bed were carried out at various conditions of flow rate and pressure. The equilibrium ratio of D<SUB>2</SUB> to H<SUB>2</SUB> on mesoporous molecular sieves was larger than the ratio on microporous molecular sieves (SBA-15 > 10X > Y > 5A), but the difference among the adsorbents decreased with increases in pressure. On the other hand, the order of breakthrough separation factor showed the opposite result (SBA-15 < 10X < Y < 5A). The breakthrough separation factors for zeolite 10X was approximately equal to the equilibrium ratio of D<SUB>2</SUB> to H<SUB>2</SUB> at the corresponding partial pressures, whereas zeolites 5A and Y showed higher breakthrough separation factors than their equilibrium ratios. In SBA-15, the separation factors from breakthrough results were even smaller than the corresponding equilibrium ratio. In the microporous adsorbent with a limited pore size (zeolite 5A in the study), the diffusion mechanism contributed to the separation of hydrogen isotope gases as one of key factors.
Mao, J.,Ye, H.,Liu, K.,Li, Z.,Takahashi, Y.,Zhao, X.,Kee, W.S. Universitetsforlaget ; Elsevier Science Ltd 2013 Lithos Vol.172 No.-
This study reports on the first comprehensive analysis of the geology, petrology and origin of the Dashuang pluton in Jinhua, eastern Zhejiang, South China, which is predominantly composed of quartz monzonite and subordinate quartz syenite that includes variable amounts of aegirine-augite. The quartz monzonite has a porphyritic texture defined by K-feldspar phenocrysts, whereas the quartz syenite shows considerable variation in grain size and is categorised into fine- and coarse-grained types. Zircons from the quartz monzonite and fine-grained quartz syenite yield LA-MC-ICP-MS (laser ablation-multi-collector-inductively coupled plasma-mass spectrometry) U-Pb ages of 231.60+/-0.86Ma and 231.7+/-1.1Ma, respectively, indicating crystallisation in the Middle Triassic. The chemistry of the quartz monzonite indicates a calc-alkaline to alkaline evolutionary trend, which may reflect partial melting of upper mantle contaminated by Proterozoic basement rocks, subjected to fractional crystallisation during ascent. Both the fine- and coarse-grained quartz syenites are alkaline and have high rare earth element (REE) concentrations, especially light rare earth elements (LREE), and are relatively enriched in large ion lithosphere elements (LILE). The Al<SUB>2</SUB>O<SUB>3</SUB> and NaO<SUB>2</SUB> contents of the quartz syenite increase proportionally with SiO<SUB>2</SUB>, owing to greater amounts of aegirine-augite and feldspar. The fine-grained quartz syenite has the lowest initial <SUP>87</SUP>Sr/<SUP>86</SUP>Sr ratio and lowest Nd model age, and the highest ε<SUB>Nd</SUB> value compared with the quartz monzonite. The quartz syenite compositions are best explained by fractional crystallisation of an enriched mantle-derived alkaline magma. Slight chemical variations result from source heterogeneities, as well as the spatially variable degrees of melting, assimilation, and other factors. Our new age and geochemical data for the alkaline rocks in eastern Zhejiang, considered together with collisional granites from South Korea, support a history of collision and extension between the Palaeo-Pacific plate and the South China Block during the Indosinian. We use these data to refine the geodynamic model for Indosinian multi-plate convergence in South China.
Wang, Y.P.,Xu, Q.,Huang, D.P.,Zhao, K.,Chen, M.,Kim, B.H. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.15
<P>The electrical conducting, thermal expansion and electrochemical properties of La1.8Sr0.2NiO4+delta were investigated in view of cathode utilization for intermediate temperature solid oxide fuel cells. La1.8Sr0.2NiO4+delta exhibited electrical conductivities of 96 -114 S cm(-1) at 600-800 degrees C and a thermal expansion coefficient of 12.6 x 10(-6) K-1 between 50 and 1000 degrees C. Based on a three-electrode half cell, the electrode properties of La1.8Sr0.2NiO4+delta were diagnosed using electrochemical impedance spectroscopy and chronopotentiometry techniques. Moreover, the, performance of an anode-supported single cell with La1.8Sr0.2NiO4+delta cathode was examined. Compared with La2NiO4+delta, La1.8Sr0.2NiO4+delta manifested improved electrode properties under cathodic polarization conditions while showing an analogous catalytic activity under open-circuit conditions. At 800 degrees C in air, La1.8Sr0.2NiO4+delta electrode displayed a polarization resistance of 0.41 0 cm(2) and a cathodic overpotential of 90 mV at 200 mA cm(-2). The anode-supported single cell with La1.8Sr0.2NiO4+delta cathode achieved a maximum power density of 520 mW cm(-2) at 800 degrees C in hydrogen fuel. Copyright (C) 2016, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.</P>
Fabrication of Nitrogen Doped p-ZnO and ZnO Light-Emitting Diodes on Sapphire
Y. M. Lu,Z. P. Wei,D. Z. Shen,Z. Z. Zhang,B. Yao,B. H. Li,J. Y. Zhang,D. X. Zhao,X. W. Fan,Z. K. Tang 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Nitrogen-doped p-type ZnO thin films were grown on c-plane sapphire (Al2O3) substrates by plasma-assistant molecular beam epitaxy, where O2 and N2 were introduced via a RF plasma source simultaneously. In situ optical emission spectra of the plasma were employed to monitor the chemical species in the active gas sources, one of the most important growth parameters. By adjusting the growth parameters, we confirm the optimal condition for p-type doping growth. The reproducible p-type ZnO thin films have the hole concentration (NA −ND) up to 1.0 × 1018 cm−3 and the resistivity of 6 cm. A ZnO LED was fabricated by depositing undoped n-type ZnO on the p-type layer. Electroluminescence spectra centered about 430 nm were obtained even at 350 K.
Sawtooth-triggered limit-cycle oscillations and I-phase in the HL-2A tokamak
Zhao, K.J.,Cheng, J.,Diamond, P.H.,Dong, J.Q.,Yan, L.W.,Hong, W.Y.,Xu, M.,Tynan, G.,Miki, K.,Huang, Z.H.,Itoh, K.,Itoh, S.-I.,Fujisawa, A.,Nagashima, Y.,Inagaki, S.,Wang, Z.X.,Wei, L.,Song, X.M.,Lei, IOP Publishing 2013 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.53 No.12
Zhao, H.,Hui, K.S.,Hui, K.N. Pergamon Press ; Elsevier Science Ltd 2014 Carbon Vol.76 No.-
We reported on the facile synthesis of N-doped multilayer graphene (N-MLG) from milk powder that uses melamine as a nitrogen-doping source with Fe<SUP>2+</SUP> ions as catalytic growth agents. We showed that milk powder could be used as a precursor for large-scale N-MLG synthesis through heat treatment at 1000<SUP>o</SUP>C under N<SUB>2</SUB> atmosphere for 45-120min. In addition, heating time has a remarkable effect on N content and type in N-MLG. The resulting N-MLG exhibited higher catalytic activity than undoped graphene and carbon nanotubes (CNTs), as well as comparable catalytic activity to commercial Pt/C catalyst toward oxygen reduction reaction (ORR). Furthermore, the catalytic activity was sensitive to N content and type, particularly the ratio of pyridinic-N to total N atoms. Results showed that Fe atoms in N-MLG were found to function not as synergetic catalysts for ORR but as catalytic growth agents for N-MLG formation, thereby promoting and stabilizing N atoms. The present method could lead to the synthesis of bulk amounts of N-MLG, which is promising for applications in electrochemical energy devices, such as fuel cells and metal-air batteries.
Zhao, Y.,Sun, Y.N.,Lee, M.J.,Kim, Y.H.,Lee, W.,Kim, K.H.,Kim, K.T.,Kang, J.S. Elsevier 2016 Journal of chromatography. B, Analytical technolog Vol.1031 No.-
Aloe arborescens, Aloe barbadensis and Aloe ferox are the most widely cultivated and used among 500 aloe species due to their potent bioactivity. However, the difference of aloe species is neglected and labeled only one name Aloe in the market without specifying aloe species discrimination in general. Furthermore, differences in bioactivity and side effects from different aloe species have not been well investigated. This study develops an effective method for simultaneous qualitative and quantitative determination of three common aloe species using high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) and high performance liquid chromatography-diode array detection (HPLC-DAD). The extraction conditions were optimized by response surface methodology (RSM) based on methanol concentration, extraction time and solvent-to-material ratio. A partial least squares-discriminant analysis (PLS-DA) was used to identify the three aloe species. The developed HPLC-MS/MS method coupled with multivariate analysis can be applied to discriminate three aloe species successfully.