Gasoline Desulfurization by Catalytic Alkylation over Methanesulfonic Acid

Xiaolin Wu,Yunpeng Bai,Ying Tian,Xuan Meng,Li Shi 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.10

Methanesulfonic acid (MSA) was used as catalyst to remove trace organic sulfur (thiophene) from Fluid Catalytic Cracking gasoline (FCC) via alkylation with olefins. The reactions were conducted in Erlenmeyer flask equipped with a water-bath under atmospheric pressure. The influence of the temperature, the reaction time, and the mass ration of MSA were investigated. After a 60 min reaction time at 343 K, the thiophene conversion of 98.7% was obtained with a mass ration of MSA to oil of 10%. The catalyst was reused without a reactivation treatment, and the thiophene conversion reached 92.9% at the third time. The method represents an environmentally benign route to desulfur, because MSA could easily be separated from the reaction mixture via decantation and it could be reused.

Optimization for Relay-Assisted Broadband Power Line Communication Systems with QoS Requirements Under Time-varying Channel Conditions

( Xiaolin Wu ),( Bin Zhu ),( Yang Wang ),( Yue Rong ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.10

The user experience of practical indoor power line communication (PLC) applications is greatly affected by the system quality-of-service (QoS) criteria. With a general broadcast- and-multi-access (BMA) relay scheme, in this work we investigate the joint source and relay power optimization of the amplify-and-forward (AF) relay systems used under indoor broad- band PLC environments. To achieve both time diversity and spatial diversity from the relay- involved PLC channel, which is time-varying in nature, the source node has been configured to transmit an identical message twice in the first and second signalling phase, respectively. The QoS constrained power allocation problem is not convex, which makes the global optimal solution is computationally intractable. To solve this problem, an alternating optimization (AO) method has been adopted and decomposes this problem into three convex/quasi-convex sub-problems. Simulation results show the fast convergence and short delay of the proposed algorithm under realistic relay-involved PLC channels. Compared with the two-hop and broadcast-and- forward (BF) relay systems, the proposed general relay system meets the same QoS requirement with less network power assumption.

Gasoline Desulfurization by Catalytic Alkylation over Methanesulfonic Acid

Wu, Xiaolin,Bai, Yunpeng,Tian, Ying,Meng, Xuan,Shi, Li Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10

Methanesulfonic acid (MSA) was used as catalyst to remove trace organic sulfur (thiophene) from Fluid Catalytic Cracking gasoline (FCC) via alkylation with olefins. The reactions were conducted in Erlenmeyer flask equipped with a water-bath under atmospheric pressure. The influence of the temperature, the reaction time, and the mass ration of MSA were investigated. After a 60 min reaction time at 343 K, the thiophene conversion of 98.7% was obtained with a mass ration of MSA to oil of 10%. The catalyst was reused without a reactivation treatment, and the thiophene conversion reached 92.9% at the third time. The method represents an environmentally benign route to desulfur, because MSA could easily be separated from the reaction mixture via decantation and it could be reused.

Esculentoside A exerts anti-oxidative stress and anti-apoptotic effects in rat experimental membranous nephropathy by regulating MAPK pathway

Wu Jin,Lei Genping,Wang Ting,Dong Sheng,Zhan Xiaolin 대한독성 유전단백체 학회 2022 Molecular & cellular toxicology Vol.18 No.3

Background Membranous nephropathy is characterized by deposition of immune complex. The initial inflammatory responses induce cell apoptosis and oxidative injury, thus contributing to the pathogenesis of chronic kidney disease. Esculentoside A exerts anti-inflammatory, anti-apoptotic and anti-oxidant abilities, and protects against acute kidney injury. Objective The renoprotective effect of Esculentoside A on a rat model with membranous nephropathy was investigated in this study. Results Injection of cationic bovine serum albumin promoted the level of 24 h proteinuria, and induced histopathological damage, including glomerular atrophy and thick glomerular basement membrane in the kidney tissues. Intraperitoneal injection with Esculentoside A reduced the level of 24 h proteinuria, and attenuated the pathological damages. Esculentoside A attenuated cationic bovine serum albumin-induced reduction of Bcl-2 protein expression, enhancements in the protein expressions of Bax and cleaved caspase-3. Besides, the enhanced levels of MDA (malondialdehyde) and NO (nitric oxide), and reduced levels of SOD (superoxide dismutase) and GSH (glutathione), in rats with membranous nephropathy were restored by Esculentoside A injection. Moreover, Esculentoside A counteracted with the promotive effects of cationic bovine serum albumin on the protein expressions of phosphorylated JNK (p-JNK), p-ERK1/2 and p-p38. Conclusion The renoprotective effects of Esculentoside A on a rat model with membranous nephropathy was mediated by its anti-oxidant and anti-apoptotic effects through inactivation of MAPKs pathway.

Transcriptome profile of one-month-old lambs' granulosa cells after superstimulation

Wu, Yangsheng,Lin, Jiapeng,Li, Xiaolin,Han, Bing,Wang, Liqin,Liu, Mingjun,Huang, Juncheng Asian Australasian Association of Animal Productio 2017 Animal Bioscience Vol.30 No.1

Objective: Superstimulatory treatment of one-month-old lambs can achieve synchronous development of numerous growing follicles. However, these growing follicles cannot complete maturation and ovulation. Oocyte maturation and competence are acquired during follicular development, in which granulosa cells play an essential role. Methods: In this study, we applied RNA sequencing to analyze and compare gene expression between prepubertal and adult superstimulated follicle granulosa cells in sheep. Results: There were more than 300 genes that significantly differed in expression. Among these differently expressed genes, many extracellular matrix genes (EGF containing Fibulin Like Extracellular Matrix Protein 1, pentraxin 3, adrenomedullin, and osteopontin) were significantly down-regulated in the superstimulated follicles. Ingenuity pathway and gene ontology analyses revealed that processes of axonal guidance, cell proliferation and DNA replication were expressed at higher levels in the prepubertal follicles. Epidermal growth factor, T-Box protein 2 and beta-estradiol upstream regulator were predicted to be active in prepubertal follicles. By comparison, tumor protein P53 and let-7 were most active in adult follicles. Conclusion: These results may contribute to a better understanding of the mechanisms governing the development of granulosa cells in the growing follicle in prepubertal sheep.

The Behavior of Phobic and Philip Oil Mist Filters Under High Pressure

Wang Yuewen,Wu Xiaolin,Chen Yuncong,Ji Zhongli 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.5

The aim of this paper is to study the changing law of fi lter media properties under high-pressure conditions, and for this purpose, an experimental setup was established to measure the properties of fi lter materials at a maximum pressure of 5 MPa. By observing the experimental phenomena produced under diff erent pressures, combining the experimental data and experimental phenomena for qualitative and quantitative analyses, the fi lter media performance change pattern under diff erent pressures was obtained. The experiments were carried out at a pressure of 1–5 MPa, and the detailed experiments were conducted on the pressure drop, saturation and the liquid distribution pattern of the fi rst and last layers of the fi lter material. The experimental results show that the liquid fi lm on the surface of the fi lter media becomes progressively thinner with increasing pressure, and the jump pressure drop becomes smaller while the saturation increases. The saturation of the fi rst layer of the oleophilic fi lter media increased by 30% and the saturation of the last layer of the oleophobic fi lter media increased by 80% when the pressure was increased from 1 to 5 MPa. In addition, the results show that with increasing pressure, the surface tension of the droplets decreases and the surface tension of the DEHS decreases from 28.72 to 25.26 mN/m. The capillary force of fi lter media B was reduced from 0.20 to 0.13 mN, a 35% reduction in capillary force which changed the distribution of droplets on the fi bres and enhanced the wettability of the fi lter material. This discovery is of great signifi cance for understand ding the variation pattern of fi lter media performance under high-pressure conditions, and provides a basis for the design and manufacture of fi lter elements for high-pressure occasions.

Joint segmentation and pairing of multispectral chromosome images

Zhao, Yongqiang,Wu, Xiaolin,Kong, Seong G.,Zhang, Lei Springer-Verlag 2013 PAA Vol.16 No.4

Evaluation of Cofactor Markers for Controlling Genetic Background Noise in QTL Mapping

Lee, Chaeyoung,Wu, Xiaolin Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.4

In order to control the genetic background noise in QTL mapping, cofactor markers were incorporated in single marker analysis (SMACO) and interval mapping (CIM). A simulation was performed to see how effective the cofactors were by the number of QTL, the number and the type of markers, and the marker spacing. The results of QTL mapping for the simulated data showed that the use of cofactors was slightly effective when detecting a single QTL. On the other hand, a considerable improvement was observed when dealing with more than one QTL. Genetic background noise was efficiently absorbed with linked markers rather than unlinked markers. Furthermore, the efficiency was different in QTL mapping depending on the type of linked markers. Well-chosen markers in both SMACO and CIM made the range of linkage position for a significant QTL narrow and the estimates of QTL effects accurate. Generally, 3 to 5 cofactors offered accurate results. Over-fitting was a problem with many regressor variables when the heritability was small. Various marker spacing from 4 to 20 cM did not change greatly the detection of multiple QTLs, but they were less efficient when the marker spacing exceeded 30 cM. Likelihood ratio increased with a large heritability, and the threshold heritability for QTL detection was between 0.30 and 0.05.

Principle and Design of a Novel Lorenz Force Type Bearingless Motor with Single-Axis Actively Regulated Capability

Qiang, Ding,Zhiquan, Deng,Xiaolin, Wang,Guyu, Wu,Tuocheng, Ni The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.5

Enhancement mechanism of SO2 removal with calcium hydroxide in the presence of NO2

Jihui Gao,Guoqing Chen,Xiaolin Fu,Yijun Yin,Shaohua Wu,Yukun Qin 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.2

The enhancement mechanism of SO2 removal by the presence of NO2 under low temperature and humid conditions was studied in a fixed bed reactor system. The presence of NO2 in the flue gas can enhance SO2 removal. The interaction between SO2 and NO2 in gas phase could not explain the effect of NO2 on SO2 removal under lowtemperature and humid conditions. When Ca(NO3)2 and Ca(NO2)2 as additive were added on the surface of sorbent,the desulfurization activity of sorbent decreased. However, the sorbent pretreated by NO2 for a moment has higher SO2removal. The oxidization of SO32− to SO42− and the evolution of sorbent surface structure in the presence of NO2 can explain the enhancement of SO2 removal by the presence of NO2. HSO3− and SO3− reacted with NO2 to form sulfate,which can accelerate the hydrolysis of SO2. The reaction between NO2 and Ca(OH)2 can make the unreacted sorbet under the SO2 removal product exposed to the reactant gas.