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Fan Ouyang,Duan-Jian Tao,Yan Zhou,Zhang-Min Li,Na Hu 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.8
Five tetrabutylphosphonium amino acid ionic liquids ([P4444][AA]) were prepared, characterized, and usedas catalysts for solvent-free Knoevenagel condensation reactions. The tetrabutylphosphonium prolinate ([P4444][Pro])showed excellent catalytic activity and selectivity in Knoevenagel condensation reactions of active methylene compoundswith various aromatic aldehydes, and all the yields of corresponding products were more than 85% under mildconditions. Furthermore, a plausible reaction mechanism for the excellent performance of [P4444][Pro] has been proposed,and [P4444][Pro] could be used repetitively at least six times without obvious decrease in activity and quantity.
Xingguang Xu,Jian Ouyang,Yuanyuan Wang,Chao Wang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
This work presents the synthesis and characterization of a new polymer, named AVS, which not onlythickens the displacingfluid at high salinity and/or elevated temperature, but also emulsifies the crudeoil. The results demonstrate AVS solution displays 50% higher apparent viscosity than the commonly usedhydrolysed polyacrylamide (HPAM) solution in the same testing conditions. Furthermore, compared toHPAM, AVS has greater capacity to resist the shearing stress. Finally, coreflooding experiments verify theAVS solution recovers more incremental oil than HPAM solution does, which is mostly attributed to itsoutstanding ability to simultaneously enhance the sweep efficiency and the displacement efficiency.
Xingguang Xu,Jian Ouyang,Yuanyuan Wang,Chao Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-
This work presents the synthesis and characterization of a new polymer, named AVS, which not only thickens the displacing fluid at high salinity and/or elevated temperature, but also emulsifies the crude oil. The results demonstrate AVS solution displays 50% higher apparent viscosity than the commonly used hydrolysed polyacrylamide (HPAM) solution in the same testing conditions. Furthermore, compared to HPAM, AVS has greater capacity to resist the shearing stress. Finally, core flooding experiments verify the AVS solution recovers more incremental oil than HPAM solution does, which is mostly attributed to its outstanding ability to simultaneously enhance the sweep efficiency and the displacement efficiency.
NOx removal by non-thermal plasma at low temperatures with amino groups additives
Zhenzhen Guan,Jian-Xing Ren,Dezhen Chen,Liu Hong,Fangqin Li,Du Wang,Yuanhuang Ouyang,Yang Gao 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
NOx removal from flue gas using direct current (DC) narrow pulsed discharge-induced non-thermal plasma (NTP) was experimentally investigated. Factors such as additives, NOx initial concentrations, residence time, reaction temperatures inside the NTP reactor, and so on were investigated to evaluate their effects on NOx removal efficiencies. The focus was on the effects of additives containing amino groups. The results showed that H2O addition enhanced NOx removal, NH3 could further increase the NOx removal efficiencies under the same conditions without an obvious NH3 slip, and N2H4 was the most effective additive by reducing NOx to N2. X-Ray diffraction (XRD) analysis of the products collected from the NTP reactor demonstrated that NOx removal inside the NTP reactor was mainly based on NOx oxidation when ammonia or H2O was used as an additive, while NOx removal was mainly based on NOx reduction with the N2H4 additive.
Secrecy Analysis of Amplify-and-Forward Relay Networks with Beamforming
( Pu Chen ),( Jian Ouyang ),( Wei-ping Zhu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.10
This paper analyzes the secrecy performance of an amplify-and-forward (AF) relay network, where a multi-antenna eavesdropper attempts to overhear the transmitted message from a multi-antenna source to a multi-antenna destination with a single antenna relay. Firstly, we derive the approximate analytical expressions for the secrecy outage probability (SOP) and average secrecy rate (ASR) of the relay network. Then, asymptotic expressions of SOP and ASR at high main-to-eavesdropper ratio (MER) are also provided to reveal the diversity gain of the secure communication. Finally, numerical results are given to verify the theoretical analysis and show the effect of the number of antennas in the considered relay network.
Luxin Liang,Deye Song,Kai Wu,Zhengxiao Ouyang,Qianli Huang,Guanghua Lei,Kun Zhou,Jian Xiao,Hong Wu 한국생체재료학회 2022 생체재료학회지 Vol.26 No.2
Background: Even though the modulatory effects of Magnisum (Mg) and its alloys on bone-healing cells have been widely investigated during the last two decades, relatively limited attention has been paid on their inflammationmodulatory properties. Understanding the activation process of macrophages in response to the dynamic degradation process of Mg as well as the relationship between macrophage phenotypes and their osteogenic potential is critical for the design and development of advanced Mg-based or Mg-incorporated biomaterials. Methods: In this work, a Ti-0.625 Mg (wt.%) alloy fabricated by mechanical alloying (MA) and subsequent spark plasma sintering (SPS) was employed as a material model to explore the inflammatory response and osteogenic performance in vitro and in vivo by taking pure Ti as the control. The data analysis was performed following Student’s t-test. Results: The results revealed that the macrophages grown on the Ti-0.625 Mg alloy underwent sequential activation of M1 and M2 phenotypes during a culture period of 5 days. The initially increased environmental pH (~ 8.03) was responsible for the activation of M1 macrophages, while accumulated Mg2+ within cells contributed to the lateral M2 phenotype activation. Both M1 and M2 macrophages promoted osteoblast-like SaOS-2 cell maturation. In vivo experiment further showed the better anti-inflammatory response, regenerative potentiality and thinner fibrous tissue layer for the Ti-0.625 Mg alloy than pure Ti. Conclusion: The results highlighted the roles of Mg degradation in the Ti-0.625 Mg alloy on the sequential activation of macrophage phenotypes and the importance of modulating M1-to-M2 transition in macrophage phenotypes for the design and development of inflammation-modulatory biomaterials.
( Gui Zi Ye ),( Min Jiang ),( Jian Li ),( Ke Quan Chen ),( Yong Lan Xi ),( Shu Wen Liu ),( Ping Wei ),( Ping Kai Ouyang ) 한국미생물 · 생명공학회 2010 Journal of microbiology and biotechnology Vol.20 No.8
Actinobacillus succinogenes, a representative succinic-acid-producing microorganism, is seriously inhibited by ammonium ions, thereby hampering the industrial use of A. succinogenes with ammonium-ion-based materials as the pH controller. Therefore, this study isolated an ammonium-ion-tolerant mutant of A. succinogenes using a continuous-culture technique in which all the environmental factors, besides the stress (ammonium ions), were kept constant. Instead of operating the mutant-generating system as a nutrient-limited chemostat, it was used as a nutrientunlimited system, allowing the cells to be continuously cultured at the maximum specific growth rate. The mutants were isolated on agar plates containing the acid-base indicator bromothymol blue and a high level of ammonium ions that would normally kill the parent strain by 100%. When cultured in anaerobic bottles with an ammonium ion concentration of 354 mmol/l, the mutant YZ0819 produced 40.21 g/l of succinic acid with a yield of 80.4%, whereas the parent strain NJ113 was unable to grow. When using NH4OH to buffer the culture pH in a 3.0 l stirred bioreactor, YZ0819 produced 35.15 g/l of succinic acid with a yield of 70.3%, which was 155% higher than that produced by NJ113. In addition, the morphology of YZ0819 changed in the fermentation broth, as the cells were aggregated from the beginning to the end of the fermentation. Therefore, these results indicate that YZ0819 can efficiently produce succinic acid when using NH4OH as the pH controller, and the formation of aggregates can be useful for transferring the cells from a cultivation medium for various industrial applications.
Anti-Tumor Effect of a Novel DOX/GA-CdTe QD was Mediated by Apoptotic and Autophagic Cell Death
Huaqin Zuo,Fan Wang,Di Zhou,Yi Zhou,Bing Chen,Jian Ouyang,Peipei Xu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.1
Burkitt's lymphoma is a highly proliferative B-cell malignancy characterized by MYC oncogene translocation. Intensive short-cycle chemotherapy could effectively improve the outcome of this disease. However, drug resistance limits the treatment of refractory/relapsed disease. Thus, we constructed and investigated a novel cadmium–tellurium quantum dot conjugated with doxorubicin and gambogic acid (DOX/GA-CdTe QDs) for cancer cell combined treatment in Raji, a Burkitt's lymphoma cell line. Results showed that DOX/GA-CdTe QDs could significantly improve anti-tumor effects compared with drugs alone in the Raji cell line. Flow cytometry, transmission electron micrographs and overexpression of Beclin1 and LC3 II/I showed that apoptosis and autophagy were involved in the process. However, DOX/GA-CdTe QDs did not cause cell cycle arrest, whereas DOX alone or combined with GA could cause apparent G2/M phase arrest. Hence, the novel DOX/GA-CdTe QDs offer a promising approach of drug delivery into cancer cells.