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G. Shi,Z. Liu,H.Y. Ban,Y. Zhang,Y.J. Shi,Y.Q. Wang 국제구조공학회 2012 Steel and Composite Structures, An International J Vol.12 No.1
Local buckling can be ignored for hot-rolled ordinary strength steel equal angle compression members, because the width-to-thickness ratios of the leg don’t exceed the limit value. With the development of steel structures, Q420 high strength steel angles with the nominal yield strength of 420 MPa have begun to be widely used in China. Because of the high strength, the limit value of the width-to-thickness ratio becomes smaller than that of ordinary steel strength, which causes that the width-to-thickness ratios of some hot-rolled steel angle sections exceed the limit value. Consequently, local buckling must be considered for 420 MPa steel equal angles under axial compression. The existing research on the local buckling of high strength steel members under axial compression is briefly summarized, and it shows that there is lack of study on the local buckling of high strength steel equal angles under axial compression. Aiming at the local buckling of high strength steel angles, this paper conducts an axial compression experiment of 420MPa high strength steel equal angles, including 15 stub columns. The test results are compared with the corresponding design methods in ANSI/AISC 360-05 and Eurocode 3. Then a finite element model is developed to analyze the local buckling behavior of high strength steel equal angles under axial compression, and validated by the test results. Followingthe validation, a finite element parametric study is conducted to study the influences of a range of parameters, and the analysis results are compared with the design strengths by ANSI/AISC 360-05 and Eurocode 3.
Q. Zhang,F. K. Shan,G. X. Liu,A. Liu,W. J. Lee,B. C. Shin 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10
Amorphous indium-titanium-zinc-oxide (ITZO) thin-film transistors (TFTs) with various channelthicknesses were fabricated at room temperature by using pulsed laser deposition. The channellayer thickness (CLT) dependence of the TFTs was investigated. All the ITZO thin films wereamorphous, and the surface roughnesses decreased slightly first and then increased with increasingCLT. With increasing CLT from 35 to 140 nm, the on/off current ratio and the field-effect mobilityincreased, and the subthreshold swing decreased. The TFT with a CLT of 210 nm exhibited theworst performance, while the ITZO TFT with a CLT of 140 nm exhibited the best performancewith a subthreshold voltage of 2.86 V, a mobility of 53.9 cm2V−1s−1, a subthreshold swing of 0.29V/decade and an on/off current ratio of 109.
Zhang, X.,Shi, L.,Li, X.,Sheng, Q.,Yao, L.,Shen, D.,Lu, Z.R.,Zhou, H.M.,Park, Y.D.,Lee, J.,Zhang, Q. Society for Bioscience and Bioengineering, Japan ; 2014 Journal of bioscience and bioengineering Vol.117 No.6
Understanding the mechanism of inhibition of α-glucosidase (EC 3.2.1.20) is clinically important because of the involvement of this enzyme in type 2 diabetes mellitus. In this study, we conducted inhibition kinetics of α-glucosidase with Ca<SUP>2+</SUP> and 10-ns molecular dynamics simulations. We found that direct binding of Ca<SUP>2+</SUP> to the enzyme induced structural changes and inhibited enzyme activity. Ca<SUP>2+</SUP> inhibited α-glucosidase in a mixed-type reaction (K<SUB>i</SUB> = 27.0 +/- 2.0 mM) and directly induced the unfolding of α-glucosidase, which resulted in the exposure of hydrophobic residues. The simulations suggest that thirteen Ca<SUP>2+</SUP> ions may interact with α-glucosidase residues and that the Ca<SUP>2+</SUP> binding sites are associated with the structural changes in α-glucosidase. Our study provides insight into the mechanism of the Ca<SUP>2+</SUP>-induced structural changes in α-glucosidase and the inhibition of ligand binding. These results suggest that Ca<SUP>2+</SUP> could act as a potent inhibitor of α-glucosidase for the treatment of type 2 diabetes mellitus.
Zhang, X.,Lian, Q.,Pan, Q.,Yuan, G.,Seo, H.J. Elsevier Sequoia 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.607 No.-
Ce<SUP>3+</SUP> and Tb<SUP>3+</SUP> ions are important activators for various phosphors, but no detailed study has been performed on SrLiB<SUB>9</SUB>O<SUB>15</SUB> crystal. Ce<SUP>3+</SUP>- and Ce<SUP>3+</SUP>/Tb<SUP>3+</SUP>-doped SrLiB<SUB>9</SUB>O<SUB>15</SUB> phosphors were synthesized by using a standard high temperature solid-state technique. The phase purity and optical properties of the prepared samples are investigated by XRD, excitation and emission spectra. The unusual luminescence properties of Ce<SUP>3+</SUP> activator, the Ce<SUP>3+</SUP> site occupying and Ce<SUP>3+</SUP>→Tb<SUP>3+</SUP> energy transfer behavior are discussed.
INVESTIGATION OF ENERGETIC DEPOSITION OF Au/Au (001) THIN FILMS BY COMPUTER SIMULATION
Zhang, Q. Y.,Pan, Z. Y.,Zhao, G. O. The Korean Vacuum Society 1998 Applied Science and Convergence Technology Vol.7 No.1
A new computer simulation method for film growth, the kinetic Monte Carlo simulation in combination with the results obtained from molecular dynamics simulation for the transient process induced by deposited atoms, was developed. The behavior of energetic atom in Au/Au(100) thin film deposition was investigated by the method. The atomistic mechanism of energetic atom deposition that led to the smoothness enhancement and the relationship between the role of transient process and film growth mechanism were discussed. We found that energetic atoms cannot affect the film growth mode in layer-by-layer at high temperature. However, at temperature of film growth in 3-dimensional mode and in quasi-two-dimensional mode, energetic atoms can enhance the smoothness of film surface. The enhancement of smoothness is caused by the transient mobility of energetic atoms and the suppression for the formation of 3-dimensional islands.