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Prediction of Density and Refractive Index of Lubricating Oils during Secondary Solvent Extraction Process by Furfural

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China Petroleum Processing & Petrochemical Technology 2021年第3期23卷 127-136页

作者： xu xiaoling Liu Yansheng State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)at KaramayKaramay Xinjiang 834000 State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102200

To meet the requirements for high aromatic content and low polycyclic aromatic(PCA)concentration,eco-friendly aromatic-rich rubber extender oils are usually produced by two-stage solvent extraction processes with *** the different properties of rubber processing oils,density and refractive index are some of the most important properties related to their final *** types of methods,including a pseudo-component approach by using mixing rules and several correlations,were used for calculation of density and refractive index at 20℃ of paraffinic furfural-extract oils and their secondary *** indicated that similar accuracy was obtained for predicting the density and the refractive index of furfural+furfural-extract paraffinic oil ***,the quadratic correlation presents its advantage over the pseudo-component approach when the composition of oils is not ***,the quadratic correlation was also used for naphthenic lubricating oils during two-stage solvent extraction *** predictions showed much larger discrepancies with respect to experimental values than those of paraffinic lubricating oils,which indicated that the quadratic correlation was more suitable for paraffinic oils with a CN value of below 37%.

关键词： density refractive index pseudo-components paraffinic furfural-extract oils naphthenic lubricating oils solvent extraction

Cytokine storm and translating IL-6 biology into effective treatments for CoVID-19

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Frontiers of Medicine 2023年第6期17卷 1080-1095页

作者： Tiantian Li Dongsheng Wang Haiming Wei xiaoling xu Department of Geriatric Medicine The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China Respiratory and Critical Care Medicine The First Afiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China Institute of Immunology and the CAS Key Laboratory of Innate Immunity and Chronic Disease School of Life Science and Medical CenterUniversity of Science and Technology of ChinaHefei 230001China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230001China

As of May 3,2023,the Coronavirus disease 2019(COVID-19)pandemic has resulted in more than 760 million confirmed cases and over 6.9 million *** patients have developed pneumonia,which can deteriorate into acute respiratory distress *** primary etiology may be attributed to cytokine storm,which is triggered by the excessive release of proinflammatory cytokines and subsequently leads to immune *** that high levels of interleukin-6(IL-6)have been detected in several highly pathogenic coronavirus-infected diseases,such as severe acute respiratory syndrome in 2002,the Middle East respiratory syndrome in 2012,and COVID-19,the IL-6 pathway has emerged as a key in the pathogenesis of this hyperinflammatory ***,we review the history of cytokine storm and the process of targeting IL-6 signaling to elucidate the pivotal role played by tocilizumab in combating COVID-19.

关键词： SARS-CoV-2 COVID-19 cytokine storm interleukin-6 tocilizumab

Characteristics of ozone vertical profile observed in the boundary layer around Beijing in autumn

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Journal of Environmental Sciences 2011年第8期23卷 1316-1324页

作者： Zhiqiang Ma xiaoling Zhang Jing xu xiujuan Zhao Wei Meng Institute of Urban Meteorology China Meteorological Administration Beijing 100089 China.

In the autumn of 2008, the vertical profiles of ozone and meteorological parameters in the low troposphere （0-1000 m） were observed at two sites around Beijing, specifically urban Nanjiao and rural Shangdianzi. At night and early morning, the lower troposphere divided into two stratified layers due to temperature inversion. Ozone in the lower layer showed a large gradient due to the titration of NO. Air flow from the southwest brought ozone-rich air to Beijing, and the ozone profiles were marked by a continuous increase in the residual layer at night. The accumulated ozone in the upper layer played an important role in the next day＇s surface peak ozone concentration, and caused a rapid increase in surface ozone in the morning. Wind direction shear and wind speed shear exhibited different influences on ozone profiles and resulted in different surface ozone concentrations in Beijing.

关键词： ozonesonde ground-level ozone in Beijing wind shear

Simulation of Solvent Extraction for Naphthenic Lubricating Base Oils

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China Petroleum Processing & Petrochemical Technology 2023年第3期25卷 153-164页

作者： xu xiaoling Wang Tianqi Tian Qingmei Liu Yansheng State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)at KaramayKaramay Xinjiang 834000China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102200China

Solvent extraction is the process of separating aromatics from vacuum distillates for the production oflubricating base oils. In this study, the authors use dimethyl sulfoxide (DMSO) instead of furfural as solvent, in light of itshigher selectivity, to obtain extracts with a high aromatic content for naphthenic lubricating base oils. We systematicallyinvestigated effects of the solvent-to-oil (S/O) ratio and extraction temperature on the yield of the extract, efficiency ofaromatic removal, and composition of the extracts and raffinates. The results showed that the aromatic content of extractsfor naphthenic oils could reach a high value of about 80%. The solvent maintained a high selectivity for aromatics fornaphthenic oils even under a high S/O ratio and a high extraction temperature. Moreover, the efficiency of aromatic removalfor naphthenic lubricating base oils could be enhanced by increasing either the S/O ratio or the extraction temperature,although these measures had limited effects in practice. Following this, we used the non-random two-liquid (NRTL) modelbased on the pseudo-component approach to simulate the liquid-liquid equilibrium of the system of DMSO + naphtheniclubricating base oils, and determined the parameters of binary interaction through regression based on the data on phaseequilibrium. The modeling results showed that the predicted yield, content of the solvent, and composition of the raffinatesand extracts were in good agreement with those obtained in the experiments. This validates the reliability of the model usedto represent the DMSO + naphthenic lubricating base oil system. Both the experimental data and the method of simulationreported here can help optimize the extraction of naphthenic lubricating base oils, and provide a better understanding of thecorresponding process.

关键词： solvent extraction naphthenic lubricating base oils liquid-liquid equilibrium thermodynamic model DMSO

Structures of the N- and C-terminal domains of MHV-A59 nucleocapsid protein corroborate a conserved RNA-protein binding mechanism in coronavirus

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Protein & Cell 2010年第7期1卷 688-697页

作者： Yanlin Ma Xiaohang Tong xiaoling xu xuemei Li Zhiyong Lou Zihe Rao Life National Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Graduate University of the Chinese Academy of Sciences Beijing 100049China Laboratory of Structural Biology Tsinghua UniversityBeijing 100084China

Coronaviruses are the causative agent of respiratory and enteric diseases in animals and *** example is SARS,which caused a worldwide health threat in *** coronaviruses,the structural protein N(nucleocapsid protein)associates with the viral RNA to form the filamentous nucleocapsid and plays a crucial role in genome replication and *** structure of Nterminal domain of MHV N protein also implicated its specific affinity with transcriptional regulatory sequence(TRS)*** we report the crystal structures of the two proteolytically resistant N-(NTD)and C-terminal(CTD)domains of the N protein from murine hepatitis virus(MHV).The structure of NTD in two different crystal forms was solved to 1.5Å.The higher resolution provides more detailed structural information than previous reports,showing that the NTD structure from MHV shares a similar overall and topology structure with that of SARS-CoV and IBV,but varies in its potential surface,which indicates a possible difference in RNA-binding *** structure of CTD was solved to 2.0-Åresolution and revealed a tightly intertwined *** is consistent with analytical ultracentrifugation experiments,suggesting a dimeric assembly of the N *** similarity between the structures of these two domains from SARS-CoV,IBV and MHV corroborates a conserved mechanism of nucleocapsid formation for coronaviruses.

关键词： crystal structure nucleocapsid protein murine hepatitis virus

Multi-componential metal intercalated graphite hybrids synthesized by co-intercalation polymerization towards highefficient microwave absorptions

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Nano Research 2023年第5期16卷 6369-6379页

作者： Junhua Su Qinbo Ma Longkun Que Hunan Jiang xiaoling xu Yong Wang Yifan Guo Zuowan Zhou Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Chemistry Southwest Jiaotong UniversityChengdu 610031China Yibin Research Institute Southwest Jiaotong UniversityYibin 644000China School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China Research Institute of Frontier Science Southwest Jiaotong UniversityChengdu 610031China

Magnetic expanded graphite(EG)hybrids were synthesized by co-intercalation polymerization of aniline together with transition metal *** results show that metal ions(Fe,Co,Ni,Cu)and even their mixtures can co-intercalate into graphite interlayers with flexibly controllable ratios and *** these co-intercalation compounds,Fe/Ni-intercalated graphite with a predesigned mole ratio of 1:3 transforms into NiFe_(2)O_(4)/FeNi_(3)@EG during the annealing *** synthesized magnetic EG hybrids present multiband microwave absorption in C and X bands due to improved impedance match as well as significantly enhanced interfacial polarization relaxation induced by multi-componential *** reflection values of−39.1 dB at 6.95 GHz and−25.7 dB at 9.4 GHz are achieved with an ultra-low loading of 5 wt.%.This work provides a flexible approach for tuning the components and structures of magnetic EG hybrids,which may contribute to the development of microwave absorption materials with superior performances.

关键词： co-intercalation intercalation polymerization expanded graphite transition metal microwave absorption

High-purity helical carbon nanotubes by trace-water- assisted chemical vapor deposition： Large-scale synthesis and growth mechanism

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Nano Research 2018年第6期11卷 3327-3339页

作者： Fanbin Meng Ying Wang Qiang Wang xiaoling xu Man Jiang xuesong Zhou Ping He Zuowan Zhou Key Laboratory of Advanced Technologies of Materials (Ministry of Education) School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China Zhonghao Heiyuan Research Institute of Chemical Industry Zigong 643201 China

Helical carbon nanotubes （HCNTs） are highly desirable due to their unique geometrical elegance and inherent physical properties; however, high-efficiency synthesis of high-purity HCNTs with high yield and full elucidation of their growth mechanism remains challenging. Traditional methods to achieve the high-yield growth of HCNTs mainly focus on controlling the size of catalytic particles. Herein, we found that addition of trace water greatly benefits large-scale synthesis of HCNTs. Uniform HCNTs with - 100% purity can be obtained, and the yield of HCNTs can reach ~ 8,078% in a run of 6 h, much higher than that obtained without trace water and any of the reported yields. Experiments and theoretical simulations are performed to reveal that the trace water can react with the dangling bond on carbon, thus inhibiting the generation of amorphous species. Furthermore, the trace water can enhance the anisotropy of the catalyst surface. This results in different segregation rates of carbon atoms coming out of different crystal planes and further periodic mismatch of the graphite layers, thus leading to the formation of HCNTs. Therefore, this new and efficient method is promising for practical, large-scale production of HCNTs.

关键词： helical carbon nanotubes trace water assist high yield and purity first-principles study growth mechanism

Association of a missense mutation in the luteinizing hormone/choriogonadotropin receptor gene (LHCGR) with superovulation traits in Chinese Holstein heifers

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Journal of Animal Science and Biotechnology 2012年第4期3卷 188-192页

作者： Yong Yu Yunwei Pang Haichao Zhao xiaoling xu Zhonghong Wu Lei An Jianhui Tian Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture College of Animal Science and TechnologyChina Agricultural University

Background： Upon binding luteinizing hormone in the ovary, the luteinizing hormone/choriogonadotropin receptor （LHCGR） is necessary for follicular maturation and ovulation, as well as luteal function. We detected mutations in the LHCGR gene and evaluated their association with superovulation. Methods： Using polymerase chain reaction-single strand sequencing, we examined polymorphisms in LHCGR and Chinese Holstein heifers. conformation polymorphism （PCR-SSCP） and DNA the genotypes associated with superovulation traits in 127 Results： A G/T polymorphism （ss52050737） in exon 11 was significantly associated with the total number of ova and the number of transferable embryos. Conclusions： LHCGR may be a new predictor for superovulation in Chinese Holstein heifers.

关键词： Chinese Holstein heifer LHCGR SNP Superovulation

Pathogenic T-cells and inflammatory monocytes incite inflammatory storms in severe COVID-19 patients

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National Science Review 2020年第6期7卷 998-1002页

作者： Yonggang Zhou Binqing Fu Xiaohu Zheng Dongsheng Wang Changcheng Zhao Yingjie Qi Rui Sun Zhigang Tian xiaoling xu Haiming Wei Institute of Immunology and the CAS Key Laboratory of Innate Immunity and Chronic Disease School of Life Science and Medical Center University of Science and Technology of China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China The First Affiliated Hospital of USTC Division of Life Sciences and Medicine University of Science and Technology of China Institute of Immunology and the CAS Key Laboratory of Innate Immunity and Chronic Disease School of Life Science and Medical Center University of Science and Technology ofChina

Pathogenic human coronavirus infections, such as severe acute respiratory syndrome Co V (SARS-Co V) and Middle East respiratory syndrome Co V(MERS-Co V), cause high morbidity and mortality [1,2]. Recently, a severe pneumonia-associated respiratory syndrome caused by a new coronavirus(SARS-Co V-2) was reported in Decem-

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