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- 저자 : H. L. Ge (검색결과 20 건)
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Magnetic-field-enhanced reactive synthesis of MnBi from Mn nanoparticles
Si, P.Z.,Yang, Y.,Yao, L.L.,Qian, H.D.,Ge, H.L.,Park, J.,Chung, K.C.,Choi, C.J. Elsevier 2019 Journal of magnetism and magnetic materials Vol.476 No.-
<P><B>Abstract</B></P> <P>The isotropic nanoparticles (NPs) and anisotropic bulk samples of MnBi were prepared from Mn NPs by using zero-field and field-assisted reactive sintering, respectively. The MnBi NPs are irregular in shape with size <I>d</I> < 600 nm, which is slightly larger than the precursor Mn NPs. The fraction of MnBi in the zero-field sintered NPs is higher than 68.6 wt%. The large surface area and small size of the Mn NPs enhanced the formation of ferromagnetic phase during sintering and the magnetic performance of the MnBi NPs, which show a coercivity (<I>H<SUB>c</SUB> </I>) up to 0.8 T and a remanent magnetization (<I>M<SUB>r</SUB> </I>) up to 44.5 Am<SUP>2</SUP>/kg at room temperature. The magnetic fields enhanced the formation of MnBi phase significantly and oriented the <I>c</I>-axis of the MnBi grains grown along the external fields during reactive sintering. A fraction of 63 wt% MnBi was formed in field-sintering within 2 h, whereas only 58.5 wt% MnBi was formed in zero-field-sintering for 48 h. The room-temperature <I>H<SUB>c</SUB> </I> and <I>M<SUB>r</SUB> </I> of the field-sintered bulk anisotropic MnBi reached up to 0.12–0.17 T and 37 Am<SUP>2</SUP>/kg, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Isotropic MnBi nanoparticles were prepared by reactive sintering of Mn nanoparticles and Bi. </LI> <LI> Anisotropic bulk MnBi was prepared by reactive sintering under a magnetic field of 5 T. </LI> <LI> Magnetic fields enhance the formation of MnBi and orient the <I>c</I>-axis of MnBi along the fields. </LI> </UL> </P>
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Weak Ferromagnetism and Exchange Bias in Antiferromagnetic Cobalt Oxide Nanoparticles
X. L. Wang,H. L. Ge,Q. L. Ye,P. Z. Si,H. J. Chen Korean Magnetics Society 2018 Journal of Magnetics Vol.23 No.4
The traditional arc discharge process for producing metallic nanoparticles was modified to be applicable for the direct preparation of oxide nanoparticles by using both conductive and insulative precursors. The cobalt oxide nanoparticles were synthesized by feeding Co and Co₂O₃ into the air plasma. The as-prepared nanoparticles are spherical in shape with size in the range of 10 to 40 nm. The phases of CoO and Co₃O₄ were detected in the samples prepared from the precursors of Co and Co₂O₃, respectively. Weak ferromagnetism and an exchange bias up to 17.1 mT were observed in these antiferromagnetic nanoparticles, owing to the presence of a large fraction of the uncompensated surface spins and possibly the local disordered regions.
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P. Z. Si,X. L. Wang,X. F. Xiao,H. J. Chen,X. Y. Liu,L. Jiang,J. J. Liu,Z. W. Jiao,H. L. Ge 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
Cr₂O₃ nanoparticles were prepared via one-step reactive laser ablation of Cr in oxygen. The metastable CrO₂ phase was obtained through the subsequent oxidation of Cr₂O₃ nanoparticles under O₂ with gas pressures of up to 40 MPa. The as-prepared Cr₂O₃ nanoparticles are spherical or rectangular in shape with sizes ranging from 20 nm to 50 nm. High oxygen pressure annealing is effective in producing meta-stable CrO₂ from as-dried Cr₂O₃ nanoparticles, and the Cr₂O₃ nanoparticles exhibit a weak ferromagnetic behavior with an exchange bias of up to 11 mT that can be ascribed to the interfacial exchange coupling between uncompensated surface spins and the antiferromagnetic core. The Cr₂O₃/CrO₂ nanoparticles exhibit an enhanced saturation magnetization and a reduced exchange bias with an increasing faction of CrO₂ due to the elimination of uncompensated surface spins over the Cr₂O₃ nanoparticles when exposed to a high pressure of O₂ and/or possible phase segregation that results in a smaller grain size for both Cr₂O₃ and CrO₂.
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Study of a-cluster Structure in 22Mg Using a Radioactive Ion Beam
차수미,K. Y. Chae,김민주,M. S. Kwag,E. J. Lee,K. Abe,S. Hayakawa,H. Shimizu,H. Yamaguchi,L. Yang,S. H. Bae,S. H. Choi,D. N. Binh,N. N. Duy,Z. Ge,V. H. Phong,K. I. Hahn,B. Hong,B. Moon,N. Iwasa,D. Kahl,L. H. 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.8
The ff-clusterization of an atomic nucleus has been studied for a long time, even from the earliest days of nuclear physics. Our understanding of the ff-cluster structure is, however, mainly limited to the self-conjugate A = 4n (n = 2; 3; 4; ) light nuclei and some of the neutron-rich radionuclides such as 10Be, 11B, and 14C. In order to study the ff-cluster structure of a neutron-deficient 22Mg nucleus, we have measured the 18Ne(ff, ff)18Ne scattering in inverse kinematics by using radioactive 18Ne beams and the 4He gas target at the Center for Nuclear Study radioactive ion beam separator of the University of Tokyo. Recoiling ff particles from the scattering were detected by using silicon strip detectors, which constitute E-E telescopes for particle identification. By adopting a thick target method, we were able to investigate a wide range of excitation energies Ex = 9:9 - 16.5 MeV in 22Mg in this work.
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Wang, X.L.,Si, P.Z.,Ge, H.L.,Shinde, K.P.,Chung, K.C.,Choi, C.J. Elsevier 2017 SOLID STATE SCIENCES Vol.67 No.-
<P><B>Abstract</B></P> <P>Ultra-high purity CrO<SUB>2</SUB> was prepared by decomposing CrO<SUB>3</SUB> in O<SUB>2</SUB> with gas pressures up to 40 MPa, which were maintained throughout the decomposition process of CrO<SUB>3</SUB> to prevent the formation of any other phases of chromium oxides. Our method is different from the traditional methods that start from or under ambient pressures. The high oxygen pressure makes the meta-stable CrO<SUB>2</SUB> stable from the initial stage of preparation. As a result, the purity of the as-prepared CrO<SUB>2</SUB> is improved, and this has been further proved by the highest magnetization of the samples. The as-prepared CrO<SUB>2</SUB> particles show very large grains with flat surfaces, octagonal cross-section, and straight edges, owing to the high mobility of Cr ions in CrO<SUB>2</SUB> at temperatures above its melting point. The lattice parameters of CrO<SUB>2</SUB> are <I>a</I> = 4.4176 Å and <I>c</I> = 2.9144 Å. The maximum value of the magnetic entropy change of the high purity CrO<SUB>2</SUB> particles is ∼2.83 J/kg·K for an applied field of 1.5 T. The preparation of pure CrO<SUB>2</SUB> is important for studying its intrinsic properties and for applications in spintronic devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ultra-high purity CrO<SUB>2</SUB> was prepared. </LI> <LI> High O<SUB>2</SUB>-gas pressure was employed. </LI> <LI> The CrO<SUB>2</SUB> rods show straight edges and high magnetization. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Zhou, C.P.,Ge, X.P.,Liu, B.,Xie, J.,Miao, L.H. Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.11
An optimum dietary carbohydrate content is important for maximum fish growth. In this study, we fed Wuchang bream (Megalobrama amblycephala) with either control diet (30.42%) or high carbohydrate diet (52.92%) for 90 d. Fish were fed to apparent satiation three times daily in an aquarium with automatic temperature control and circulated water. Growth performance, plasma biochemical parameters, hepatic morphology and enzyme activities were determined. It was shown that compared to fish fed control diet, fish fed high carbohydrate diet had higher plasma triglyceride and cortisol levels for d 90, and lower alkaline phosphatase level for d 45, lower hepatic superoxide dismutase and total antioxidative capacity for d 90, higher malondialdehyde for d 45 and glycogen content for d 45 and 90 (p<0.05). Histological and transmission electron microscopy studies showed that hepatocytes of fish fed high carbohydrate diet contained large lipid droplets, causing displacement of cellular organelles to periphery of hepatocytes. The relative level of hepatic heat shock protein 70 (HSP70) mRNA of Wuchang bream fed high carbohydrate diet was significantly higher than that of fish fed the control diet for 90 d (p<0.05). These changes led to decreased specific growth rate and increased feed conversion ratio (p<0.05). Upon hypoxia challenge, fish fed high carbohydrate diet had higher cumulative mortality than those fed the control diet (p<0.05). These results suggested that high dietary carbohydrate (52.92%) was detrimental to the growth performance and health of Wuchang bream.
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S.T. Ke,L.Y. Du,Y.J. Ge,Q. Yang,H. Wang,Y. Tamura 한국풍공학회 2018 Wind and Structures, An International Journal (WAS Vol.27 No.1
The straight-cone steel cooling tower is a novel type of structure, which has a distinct aerodynamic distribution on the internal surface of the tower cylinder compared with conventional hyperbolic concrete cooling towers. Especially in the extreme weather conditions of strong wind and heavy rain, heavy rain also has a direct impact on aerodynamic force on the internal surface and changes the turbulence effect of pulsating wind, but existing studies mainly focus on the impact effect brought by wind-driven rain to structure surface. In addition, for the indirect air cooled cooling tower, different additional ventilation rate of shutters produces a considerable interference to air movement inside the tower and also to the action mechanism of loads. To solve the problem, a straight-cone steel cooling tower standing 189 m high and currently being constructed is taken as the research object in this study. The algorithm for two-way coupling between wind and rain is adopted. Simulation of wind field and raindrops is performed with continuous phase and discrete phase models, respectively, under the general principles of computational fluid dynamics (CFD). Firstly, the rule of influence of 9 combinations of wind sped and rainfall intensity on flow field mechanism, the volume of wind-driven rain, additional action force of raindrops and equivalent internal pressure coefficient of the tower cylinder is analyzed. On this basis, the internal pressures of the cooling tower under the most unfavorable working condition are compared between four ventilation rates of shutters (0%, 15%, 30% and 100%). The results show that the 3D effect of equivalent internal pressure coefficient is the most significant when considering two-way coupling between wind and rain. Additional load imposed by raindrops on the internal surface of the tower accounts for an extremely small proportion of total wind load, the maximum being only 0.245%. This occurs under the combination of 20 m/s wind velocity and 200 mm/h rainfall intensity. Ventilation rate of shutters not only changes the air movement inside the tower, but also affects the accumulated amount and distribution of raindrops on the internal surface.
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Tang, Q.,Li, L.,Lee, M. J.,Ge, Q.,Lee, J. M.,Jung, H. S. Springer Science + Business Media 2016 Cell and tissue research Vol.363 No.3
<P>Retinoic acid (RA)-induced cleft palate results from both extrinsic obstructions by the tongue and internal factors within the palatal shelves. Our previous study showed that the spatiotemporal expression of Rac1 regulates the fibronectin (FN) arrangement through cell density alterations that play an important role in palate development. In this study, we investigate the involvement of the Rac1 regulation of the FN arrangement in RA-induced cleft palate. Our results demonstrate that RA-induced intrinsic alterations in palatal shelves, including a delayed progress of cell condensation, delay palate development, even after the removal of the tongue. Further analysis shows that RA treatment diminishes the region-distinctive expression of Rac1 within the palatal shelves, which reversely alters the fibrillar arrangement of FN. Furthermore, RA treatment disrupts the formation of lamellipodia, which are indicative structures of cell migration that are regulated by Rac1. These results suggest that the Rac1 regulation of the FN arrangement is involved in RA-induced cleft palate through the regulation of cell migration, which delays the progress of cell condensation and subsequently influences the FN arrangement, inducing a delay in palate development. Our study provides new insights into the RA-induced impairment of palatal shelf elevation based on cell migration dynamics.</P>
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