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Zhang, G.,Zhu, M.,Guo, J.,Ma, J.,Wang, X.,Lu, H.,Qiu, L. Elsevier Science 2014 ORGANIC ELECTRONICS Vol.15 No.10
A series of benzodithiophene (BDT) and benzotrithiophene (BTT)-based conjugated polymers (P1-P4), with/without conjugated- and acyl-side chain, have been synthesized by Stille cross-coupling reaction. Their thermal, photophysical, electrochemical properties, devices performances, and microstructure have been investigated. Conjugated-side chain can significantly raise the thermal stability and acyl-side chain can lower HOMO/LUMO energy levels. Organic thin-film transistors (OTFTs) based on conjugated polymers were fabricated and the transistor electrical characterization showed the device performance was sensitive to the conjugated- and acyl-side chain substituent of polymers. A maximum hole mobility of 1.70x10<SUP>-3</SUP>cm<SUP>2</SUP>V<SUP>-1</SUP>s<SUP>-1</SUP> was obtained for P1-based devices, which is an order of magnitude higher than those of P3 and P4-based devices. The corresponding microstructures were investigated by grazing-incidence X-ray diffraction (GIXD) to correlate with conjugated- and acyl-side chain dependent carrier mobility of P1-P4. The results showed that the conjugated- and acyl-side chain have an impact on the polymer packing models and device performances.
Z. P. Zhang,J. D. Liu,K. Q. Qiu,Y. Y. Huang,J. G. Li,X. G. Wang,J. L. Liu,M. Wang,M. K. Zou,Y. Z. Zhou 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
A novel fourth-generation nickel-based single crystal superalloy was bonded by vacuum brazing at 1230 °C, 1260 °C and1290 °C for 60 min using a new type of Co-based filler alloy. The effects of the brazing temperature on the microstructureand mechanical properties of the brazed joint were investigated. The brazed joint was mainly composed of the non-isothermalsolidification zone (M3B2 type-boride, CrB boride, Ni3Bboride and MC carbide), isothermal solidification zone (γ and γ'Phase) and base metal. With the increase of brazing temperature, the volume fraction of borides and γ' phase in the centerof the joint decreased and increased, respectively. The high-temperature tensile test results show that the tensile strength ofthe joints was improved with increasing brazing temperature, and the maximum tensile strength of the joint was 766 MPaafter brazing at 1290 °C for 60 min. Fracture observation shows that the fracture modes of the joints were the same, whichbelongs to the typical quasi cleavage fracture. The element distribution in the joint was homogenized to a certain extent at1290 °C. The segregation of Si and Ru was found, but they were still dissolved in the γ solid solution. The experimentalresults help to better understand the microstructure characteristics of the novel fourth-generation nickel-based single crystalsuperalloy and provide guidance for further optimizing the process parameters of the brazed joint.
( Luo M ),( J Qiu ),( Y Zhang ),( J Dong ),( H Li ),( B Leng ),( Q Zhang ),( X Dai ),( X Niu ),( S Zhao ),( X Deng ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.8
In this study, we aimed to evaluate the effect of a-cyperone on S. aureus. We used a hemolysin test to examine the hemolytic activity in supernatants of S. aureus cultured with increasing concentrations of a-cyperone. In addition, we evaluated the production of a-hemolysin (Hla) by Western blotting. Real-time RT-PCR was performed to test the expression of hla (the gene encoding Hla) and agr (accessory gene regulator). Furthermore, we investigated the protective effect of a-cyperone on Hla-induced injury of A549 lung cells by live/dead and cytotoxicity assays. We showed that in the presence of subinhibitory concentrations of a-cyperone, Hla production was markedly inhibited. Moreover, a-cyperone protected lung cells from Hla-induced injury. These findings indicate that a-cyperone is a promising inhibitor of Hla production by S. aureus and protects lung cells from this bacterium. Thus, a-cyperone may provide the basis for a new strategy to combat S. aureus pneumonia.
Model Tests on Reinforced Sloped Embankment with Denti-strip Inclusions under Monotonic Loading
M. X. Zhang,C. C. Qiu,A. A. Javadi,S. L. Zhang 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5
Denti-strip inclusion is a new type reinforcement that consists of conventional strip type reinforcement and vertical inclusionswhich are installed on the strip in spacing. A series of laboratory model tests were carried out on a physical model of reinforcedsloped embankment with strip inclusions and denti-strip inclusions under surcharge. Compared with strip reinforcement, it is foundthat due to the existence of vertical reinforcing elements which provided passive resistances against shearing and enhanced soilstrength, denti-strip inclusions are more effective in improving the ultimate surcharge, reducing the settlement and restricting thelateral displacement of the slope. Furthermore, the shear bands in the embankment reinforced with two-layer inclusions under thecondition without cutting of reinforcements are separated into several discontinuous arc bands by the inclusions unlike the singlecontinuous arc in unreinforced embankment; the inclination angles of the shear bands are greater than that of unreinforcedembankment and the position of the lower arc is close to the mid-height of embankment.
Low-temperature catalytic combustion of benzene over Ni–Mn/CeO2/cordierite catalysts
B. Li,Q. Huang,X.K. Yan,X.L. Xu,Y. Qiu,B. Yang,Y.W. Chen,S.M. Zhu,S.B. Shen 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The catalytic combustion of benzene over a Ni–Mn mixed oxide supported on cordierite coated with CeO2 was investigated. The catalysts were prepared using a sol–gel method and characterized using BET, H2-TPR, XRD, SEM and TEM. The catalysts calcined at 500 ℃ for 7 h with a Ni/Mn molar ratio of 1 exhibited the highest catalytic activity. When the concentration of benzene was 4.8 g/m3 and the GHSV was 15,000 h-1, the conversion was 94.3% at 300 ℃. These results were primarily attributed to the catalyst structure and the synergistic activity of the NiMnO3 perovskite and crystalline CeO2.
L. P. Zhu,X. Q. Gu,H. P. He,F. Huang,M. X. Qiu,Z. Z. Ye,Y. Z. Zhang,B. H. Zhao 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
A ZnO/Zn0.85Mg0.15O single quantum well (SQW) was fabricated on a Si(111) substrate by using a pulsed laser deposition (PLD) technique. Photoluminescence (PL) measurements were carried out in the range of 10 − 290 K in order to investigate the mechanism of carrier dynamics. At 10 K, the sample exhibited two predominant ultraviolet emissions, one at 3.57 eV and the other at 3.38 eV, which were attributed to recombinations of localized excitons (LE band) in the barrier and the well layers, respectively. The quantum well emission showed a blue shift of nearly 20 meV with respect to the epitaxial ZnO films. We also observed that the carrier localization resulted in an “S-shaped” red-blue-red shift of the ∽3.38 eV emission with increasing temperature. A ZnO/Zn0.85Mg0.15O single quantum well (SQW) was fabricated on a Si(111) substrate by using a pulsed laser deposition (PLD) technique. Photoluminescence (PL) measurements were carried out in the range of 10 − 290 K in order to investigate the mechanism of carrier dynamics. At 10 K, the sample exhibited two predominant ultraviolet emissions, one at 3.57 eV and the other at 3.38 eV, which were attributed to recombinations of localized excitons (LE band) in the barrier and the well layers, respectively. The quantum well emission showed a blue shift of nearly 20 meV with respect to the epitaxial ZnO films. We also observed that the carrier localization resulted in an “S-shaped” red-blue-red shift of the ∽3.38 eV emission with increasing temperature.
Cyanophora paradoxa Genome Elucidates Origin of Photosynthesis in Algae and Plants
Price, D. C.,Chan, C. X.,Yoon, H. S.,Yang, E. C.,Qiu, H.,Weber, A. P. M.,Schwacke, R.,Gross, J.,Blouin, N. A.,Lane, C.,Reyes-Prieto, A.,Durnford, D. G.,Neilson, J. A. D.,Lang, B. F.,Burger, G.,Steiner American Association for the Advancement of Scienc 2012 Science Vol.335 No.6070
A study on the dynamic characteristics of the secondary loop in nuclear power plant
Zhang, J.,Yin, S.S.,Chen, L.,Ma, Y.C.,Wang, M.J.,Fu, H.,Wu, Y.W.,Tian, W.X.,Qiu, S.Z.,Su, G.H. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.5
To obtain the dynamic characteristics of reactor secondary circuit under transient conditions, the system analysis program was developed in this study, where dynamic models of secondary circuit were established. The heat transfer process and the mechanical energy transfer process are modularized. Models of main equipment were built, including main turbine, condenser, steam pipe and feedwater system. The established models were verified by design value. The simulation of the secondary circuit system was conducted based on the verified models. The system response and characteristics were investigated based on the parameter transients under emergency shutdown and overload. Various operating conditions like turbine emergency shutdown and overspeed, condenser high water level, ejector failures were studied. The secondary circuit system ensures sufficient design margin to withstand the pressure and flow fluctuations. The adjustment of exhaust valve group could maintain the system pressure within a safe range, at the expense of steam quality. The condenser could rapidly take out most heat to avoid overpressure.