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Laser Diagnostics of Butanol-Biodiesel-Diesel Spray and Combustion
( Y. Liu ),( W. L. Cheng ),( M. Huo ),( C. F. Lee ),( J. Li ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
To investigate the spray and combustion characteristics of a ternary blend of butanol-biodiesel-diesel under working conditions similar to diesel engines, a constant volume chamber with optical access coupled with high speed imaging were applied. The spray penetration lengths for fuels with different blending ratio at various ambient temperatures were recorded. A repeatable sudden drop of spray penetration length was observed at 800 K and 900 K for the ternary blends, but not at 1000 K and 1200 K, which was attributed by micro-explosion. Further studies focus on micro-explosion phenomena under non-combusting environment. High speed imaging showed that the tip of the spray jet erupted into a plume sometime after injection for the butanol-biodiesel-diesel blend at initial temperature 1100 K. The phenomenon was not seen with the biodiesel-diesel blend, neither at lower ambient temperature of 900 K. With biodiesel content increasing, micro-explosion becomes excited and more violent. It was concluded that micro-explosion can occur under particular conditions for the butanol-biodiesel-diesel blend, and the results was consistent with previous theoretical study in the literature.
Dou, H.,Li, Y.,Choi, J.,Huo, S.,Ding, L.,Shen, S.,Lee, S. Elsevier 2016 Journal of Chromatography A Vol.1465 No.-
<P>The capability of asymmetrical flow field-flow fractionation (AF4) coupled with UV/VIS, multiangle light scattering (MALS) and quasi-elastic light scattering (QELS) (AF4-UV-MALS-QELS) for separation and characterization of egg yolk plasma was evaluated. The accuracy of hydrodynamic radius (Rh) obtained from QELS and AF4 theory (using both simplified and full expression of AF4 retention equations) was discussed. The conformation of low density lipoprotein (LDL) and its aggregates in egg yolk plasma was discussed based on the ratio of radius of gyration (R-g) to R-h together with the results from bio-transmission electron microscopy (Bio-TEM). The results indicate that the full retention equation is more relevant than simplified version for the Rh determination at high cross flow rate. The Rh from online QELS is reliable only at a specific range of sample concentration. The effect of programmed cross flow rate (linear and exponential decay) on the analysis of egg yolk plasma was also investigated. It was found that the use of an exponentially decaying cross flow rate not only reduces the AF4 analysis time of the egg yolk plasma, but also provides better resolution than the use of either a constant or linearly decaying cross flow rate. A combination of an exponentially decaying cross flow AF4-UV-MALS-QELS and the utilization of full retention equation was proved to be a useful method for the separation and characterization of egg yolk plasma. (C) 2016 Elsevier B.V. All rights reserved.</P>
Xue, X.,Fan, B.,Liu, T.,Sun, X.,Huo, L.,Ha, S.,Choi, H.,Kim, T.,Kim, J.,Wei, D. Royal Society of Chemistry 2016 Polymer chemistry Vol.7 No.24
<P>Extensive efforts have been focused on the study of wide-band gap (WBG) polymers due to their important applications in multiple junction and ternary blend organic solar cells. Herein, three WBG copolymers named PBDT(X)-T1 (X = O, S, Se) were synthesized based on the benzodithiophene (BDT) donor unit and 1,3-bis(5-bromothiophen-2-yl)-5,7-bis(2-ethylhexyl)-4H, 8H-benzo[1,2-c: 4,5-c']dithiophene-4,8-dione (T1) acceptor unit. Different aromatic heterocycle groups (furan, thiophene and selenophene) were introduced to modify the BDT unit to investigate the influence of conjugated side chains on the photovoltaic properties of conjugated polymers. Photophysical properties, electrochemistry, charge transport and crystalline properties of the polymers were studied to discuss the role of chalcogen atoms on the performance of conjugated polymers. Solar cells based on these three WBG copolymers were fabricated. Among them, the PBDT(Se)-T1-based solar cell shows the best photovoltaic performance with the highest power conversion efficiency (PCE) of 8.52%, an open-circuit voltage (V-oc) of 0.91 V, and a high fill factor (FF) of 72%. The high crystallinity and preferential face-on orientation in the blend film partially explain the superior photovoltaic performance achieved in PBDT(Se)-T1-based solar cells. The results indicate the important role of chalcogen atoms in conjugated side chains and that high photovoltaic performance can be realized through side chain engineering of BDT-based WBG conjugated polymers.</P>
Activation of antiferromagnetic domain switching in exchange-coupled Fe/CoO/MgO(001) systems
Li, Q.,Chen, G.,Ma, T. P.,Zhu, J.,N'Diaye, A. T.,Sun, L.,Gu, T.,Huo, Y.,Liang, J. H.,Li, R. W.,Won, C.,Ding, H. F.,Qiu, Z. Q.,Wu, Y. Z. American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.91 No.13
Antioxidant and antibacterial activity of Trametes polyzona (Pers.) Justo
Erute M. Adongbede,Yogini S. Jaiswal,Shurrita S. Davis,Priscilla D. Randolph,Li-Ni Huo,Leonard L. Williams 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.1
Polypores are cosmopolitan mushrooms, widely investigated for their beneficial properties in combatting multidrug resistant pathogens. The present study focuses on the need for new, naturally sourced antimicrobial and antioxidant compounds from mushrooms. The antioxidant and antibacterial activity of the phenolic extract of strains of Trametes polyzona (Pers.) Justo, were investigated. Strains of T. polyzona were analyzed for total phenolic content, Trolox antioxidant equivalent, DPPH radical scavenging and antibacterial activities. The amplification of the ribosomal DNA-ITS fragments from DNA of selected mushrooms was carried out using ITS1 and ITS4 primers. The antibacterial activity of phenolic extracts of T. polyzona was comparable to the antibiotics, ceftazidime and erythromycin. T. polyzona extracts inhibited the growth of the different strains of K. pneumoniae, E. coli, S. aureus, and S. enterica tested in this study. The results of the study demonstrate that, T. polyzona can be a potential source of antimicrobial and antioxidant compounds.