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X. J. Chen,J. C. Xu,H. X. Jin,D. F. Jin,B. Hong,H. L. Ge,X. Q. Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.5
In this paper, ordered mesoporous SBA-15 silica was synthesized by the hydrothermal method, and then a series of CoFe2O4/SBA-15 nanocomposites were synthesized by a facile impregnation method. X-ray diffraction and N2 adsorption–desorption isotherms were used to characterize the microstructure and morphology of SBA-15 and CoFe2O4/SBA-15 nanocomposites. CoFe2O4 nanoparticles presented spinel phase structure and existed in the mesopores of SBA-15. The magnetic response of CoFe2O4/SBA-15 nanocomposites was characterized with vibrating sample magnetometer (VSM). The adsorption efficiency of CoFe2O4/SBA-15 nanocomposites for methylene blue increased firstly with the increasing CoFe2O4 content, and then decreased. Sample-2 (SBA-15: CoFe2O4 = 1: 0.1 in the precursor) not only presented the best adsorptive performance, but also could be separated and retrieved effectively by magnetic separation technique.
Experimental Study of the Runaway Current in the J-TEXT Tokamak
Y. H. Luo,Z. Y. Chen,X. Q. Zhang,D. W. Huang,W. Jin,Y. H. Huang,Y. Tang,J. C. Li,R. H. Tong,W. Yan,G. Zhuang 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.3
Major plasma disruptions in tokamaks often generate runaway currents, which contain electronswith energies of several tens of megaelectron-volts (MeV). These currents can cause substantialdamage when control is lost and the current hits the limiters or the vessel wall. The interactionbetween the runaway electrons and the impurities inside the plasma results in soft X-ray emission,which can provide detailed information about the runaway generation process and the confinementof runaway electrons. A vertical soft X-ray array at the top of Joint Texas Experimental Tokamak(J-TEXT) was used to study the runaway beams resulting from major disruptions. Runawayelectron production and confinement of runaway current were observed by using soft X-ray images.
Microwave Absorption and Magnetic Properties of Cobalt Ferrites/Carbon Nanotubes Nanocomposites
B. B. Zhang,P. F. Wang,J. C. Xu,Y. B. Han,H. X. Jin,D. F. Jin,X. L. Peng,B. Hong,J. Li,J. Gong,H. L. Ge,Z. W. Zhu,X. Q. Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.5
Owing to the unique microstructure and the excellent dielectric properties, carbon nanotubes(CNTs) were decorated with CoFe2O4 nanoparticles to synthesize the CoFe2O4/CNTs nanocomposites by the solvothermal method. The phase structure, morphology, magnetic properties and microwave absorption performance of the as-prepared CoFe2O4/CNTs were characterized and discussed by X-ray diffraction (XRD), thermal gravity analysis (TGA), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and vector network analyzer (VNA). All results indicated that the diameter of CoFe2O4 nanoparticles decorating on the surface of CNTs increased with the solvothermal temperature. CoFe2O4/CNTs prepared at 180℃, 200℃ and 220℃ exhibited superparamagnetism, while the other samples presented ferromagnetism at room temperature. And with the increasing solvothermal temperature, the saturation magnetization and coercivity increased up to 72 emu/g and 2000 Oe for the sample prepared at 260℃ (S-26). And the reflection loss of CoFe2O4/CNTs nanocomposites increased with the solvothermal temperature up to -15.7 dB for S-26 with the bandwidth of 2.5 GHz.
Jin, Q.,Eom, H.x2010,J.,Jung, J.Y.,Moon, J.S.,Kim, J.H.,Han, N.S. Blackwell Publishing Ltd 2012 Letters in applied microbiology Vol.55 No.4
<P><B>Abstract</B></P><P><B>Aims: </B> To establish an efficient genetic transformation protocol for <I>Leuconostoc</I> species, methods for competent‐cell preparation and electroporation conditions were optimized.</P><P><B>Methods and Results: </B> <I>Leuconostoc mesenteroides</I> subsp. <I>mesenteroides</I> ATCC8293 cells were sequentially treated with penicillin G and lysozyme, and the plasmid pLeuCM was subsequently transformed into the cells. Our results demonstrated that transformation efficiencies were significantly increased (100‐fold), and increased electric field strength also contributed to enhance transformation efficiency. Maximum transformation efficiency (1 × 10<SUP>4</SUP> or more transformants per μg DNA) was achieved when cells were grown in De Man, Rogosa, Sharpe (MRS) media containing 0·25 mol l<SUP>−1</SUP> sucrose and 0·8 μg ml<SUP>−1</SUP> penicillin G, followed by treatment with 600 U ml<SUP>−1</SUP> lysozyme and electroporation at a field strength of 10 kV cm<SUP>−1</SUP>. When this protocol was used to transform pLeuCM into <I>Leuc.?mesenteroides</I>, <I>Leuconostoc gelidum</I>, <I>Leuconostoc fallax</I> and <I>Leuconostoc argentinun</I>, successful transformations were obtained in all cases. Furthermore, this procedure was applicable to species belonging to other genera, including <I>Lactobacillus plantarum</I>, <I>Pediococcus pentosaceus</I> and <I>Weissella confusa.</I></P><P><B>Conclusions: </B> The results demonstrate that the transformation efficiency for <I>Leuconostoc</I> spp. could be increased via optimization of the entire electroporation procedures.</P><P><B>Significance and Impact of the Study: </B> These optimized conditions can be used for the extensive genetic study and the metabolic engineering of not only <I>Leuconostoc</I> spp. but also different species of lactic acid bacteria.</P>
Radio Selection of the Most Distant Galaxy Clusters
Daddi, E.,Jin, S.,Strazzullo, V.,Sargent, M. T.,Wang, T.,Ferrari, C.,Schinnerer, E.,Smolx10d,ix107,, V.,Calabró,, A.,Coogan, R.,Delhaize, J.,Delvecchio, I.,Elbaz, D.,Gobat, R.,Gu, Q.,Liu, D. American Astronomical Society 2017 ASTROPHYSICAL JOURNAL LETTERS - Vol.846 No.2
Analysis of the Magnetic Properties of RFe₁₁Ti and RFe₁₁TiH (R=Tb,Ho)
S. W. Xu,Y. Yan,H. M. Jin,X. F. Wang,W. Q. Wang,F. Su 한국자기학회 2003 Journal of Magnetics Vol.8 No.4
The values of crystalline-electric-field parameters A㎚ for RFe₁₁TiHx (R=Tb,Ho) (x=0,1) are obtained by fitting calculations to the magnetization curves along the crystal axes at 4.2 K and higher temperatures. The insertion of H element in RFe₁₁Ti significantly affects CEF parameters A㎚. By using exchange field 2μ_BHex derived by inelastic neutron scattering and fitted A㎚, the calculations reproduce the experimental curves well.
Side Population Cell Level in Human Breast Cancer and Factors Related to Disease-free Survival
Jin, C.G.,Zou, T.N.,Li, J.,Chen, X.Q.,Liu, X.,Wang, Y.Y.,Wang, X.,Che, Y.H.,Wang, X.C.,Sriplung, Hutcha Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.3
Side population (SP) cells have stem cell-like properties with a capacity for self-renewal and are resistant to chemotherapy and radiotherapy. Therefore the presence of SP cells in human breast cancer probably has prognostic value. Objective: To investigate the characteristics of SP cells and identify the relationship between the SP cells levels and clinico-pathological parameters of the breast tumor and disease-free survival (DFS) in breast cancer patients. Materials and Methods: A total of 122 eligible breast cancer patients were consecutively recruited from January 1, 2006 to December 31, 2007 at Yunnan Tumor Hospital. All eligible subjects received conventional treatment and were followed up for seven years. Predictors of recurrence and/or metastasis and DFS were analyzed using Cox regression analysis. Human breast cancer cells were also obtained from fresh human breast cancer tissue and cultured by the nucleic acid dye Hoechst33342 with Verapami. Flow cytometry (FCM) was employed to isolate the cells of SP and non-SP types. Results: In this study, SP cells were identified using flow cytometric analysis with Hoechst 33342 dye efflux. Adjusted for age, tumor size, lymph nodal status, histological grade, the Cox model showed a higher risk of recurrence and/or metastasis positively associated with the SP cell level (1.75, 1.02-2.98), as well as with axillary lymph node metastasis (2.99, 1.76-5.09), pathology invasiveness type (1.7, 1.14-2.55), and tumor volume doubling time (TVDT) (1.54, 1.01-2.36). Conclusions: The SP cell level is independently associated with tumor progression and clinical outcome after controlling for other pathological factors. The axillary lymph node status, TVDT and the status of non-invasive or invasive tumor independently predict the prognosis of breast cancer.
MODELING AND CONTROL STRATEGY DEVELOPMENT OF A PARALLEL HYBRID ELECTRIC BUS
X. YE,Z. JIN,X. HU,Y. LI,Q. LU 한국자동차공학회 2013 International journal of automotive technology Vol.14 No.6
This paper presents the system modeling, control strategy design, and experiment validation of a parallel hybrid electric bus with an automatic manual transmission (AMT) and a dry clutch. The mathematical model representation and the system architecture of the powertrain are first described. Next, a complete control scheme including energy management strategy and coordinated control of the AMT and the clutch is presented. The controller and powertrain models are then integrated in a way that the power management and the hybrid driveline perform in real world. The analysis and validation through model simulation and comparison with experiment data are conducted. A good agreement between the model and experiment demonstrates the efficacy and credibility of the integrated model. The integrated model is employed in both simulation and bench-test assessments for the development of a hybrid control unit. The results indicate that the model-based design methodology is beneficial to systematically analyzing and understanding the dynamics of hybrid electric powertrain.
Effect of Ruthenium on Tensile Properties of a Single Crystal Ni-Based Superalloy
X. P. Tan,J. L. Liu,T. Jin,Z. Q. Hu,홍현욱,B. G. Choi,I. S. Kim,조창용 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.5
The tensile properties of two single crystal Ni-based superalloys with and without added Ru (0 and 3 wt%)were investigated under a constant strain rate of 3.3×10−4/s at 20 °C, 760 °C, 800 °C and 1000 °C, respectively. The deformation mechanisms could be divided into two temperature regimes. From room temperature to 800 °C, the deformation mechanism is caused by the shearing of γ′ particles by anti-phase boundaries (APB) or stacking faults. At 1000 °C, the deformation mechanism is caused by the bypassing of γ′ particles by dislocations. At 20 °C and 800 °C, γ′ particles were sheared by APB. Due to smaller γ′particles, the yield strength was decreased with addition of 3 wt% Ru. Additionally, work hardening is less pronounced in the alloy without Ru, hence the ultimate tensile strength was not decreased with the addition of 3 wt% Ru. At 760 °C, γ′ particles were sheared by stacking faults. Since the formation of stacking faults was promoted, the yield strength was decreased due to a 3 wt% Ru addition. However, the ultimate tensile strength was significantly increased when 3 wt% Ru was added. This is due to the markedly stronger work hardening caused by large numbers of stacking faults. At 1000 °C, deformation occurred by dislocations bypassing γ′ particles. Due to wider γ channels, the yield strength was decreased by 3 wt% Ru addition. Moreover, Alloy 3Ru has smaller γ′ particles and a volume fraction as well as less pronounced work hardening, so the ultimate tensile strength was decreased when 3 wt% Ru was added.