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Journal of Hydrodynamics 2024年第1期36卷 184-201页

作者： xiao-qi Jia Shuai-kang Zhang Zu-chao Zhu Key Laboratory of Fluid Transmission Technology of Zhejiang Province Zhejiang Sci-Tech UniversityHangzhou310018China

To reveal the cavitation forms of tip leakage vortex(TLV)of the axial flow pump and the flow mechanism of the flow field,this research adopts the partially-averaged Navier-Stokes(PANS)model to simulate the cavitation values of an axial flow pump,followed by experimental *** experimental result shows that compared with the shear stress transport(SST)k-ωmodel,the PANS model significantly reduces the eddy viscosity of the flow field to make the vortex structure clearer and allow the turbulence scale to be more robustly *** cavitation area within the axial flow pump mainly comprises of TLV cavitation,clearance cavitation and tip leakage flows combined effect of triangular cloud cavitation *** formation and development of cavitation are accompanied by the formation and evolution of vortex,and variations in vortex structure also generate and promote the development of *** addition,an in-depth analysis of the relationship between the turbulent kinetic energy(TKE)transport equation and cavitation patterns was also conducted,finding that the regions with relatively high TKE are mainly distributed around gas/liquid boundaries with serious cavitation and evident gas-liquid *** phenomenon is mainly attributed to the combined effect of the pressure action term,stress diffusion term and TKE production term.

关键词： Cavitation axial flow pump tip leakage vortex(TLV) partially-averaged Navier-Stokes(PANS)model turbulent kinetic energy(TKE)

Quantitative Analysis of Seeing with Height and Time at Muztagh-Ata Site Based on ERA5 Database

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Research in Astronomy and Astrophysics 2024年第1期24卷 87-95页

作者： xiao-qi Wu Cun-Ying xiao Ali Esamdin Jing Xu Ze-Wei Wang Luo xiao Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Department of Astronomy Beijing Normal UniversityBeijing 100875China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China

Seeing is an important index to evaluate the quality of an astronomical *** estimate seeing at the Muztagh-Ata site with height and time quantitatively,the European Centre for Medium-Range Weather Forecasts reanalysis database(ERA5)is *** calculated from ERA5 is compared consistently with the Differential Image Motion Monitor seeing at the height of 12 *** show that seeing decays exponentially with height at the Muztagh-Ata *** decays the fastest in fall in 2021 and most slowly with height in *** seeing condition is better in fall than in *** median value of seeing at 12 m is 0.89 arcsec,the maximum value is1.21 arcsec in August and the minimum is 0.66 arcsec in *** median value of seeing at 12 m is 0.72arcsec in the nighttime and 1.08 arcsec in the *** is a combination of annual and about biannual variations with the same phase as temperature and wind speed indicating that seeing variation with time is influenced by temperature and wind *** Richardson number Ri is used to analyze the atmospheric stability and the variations of seeing are consistent with Ri between *** quantitative results can provide an important reference for a telescopic observation strategy.

关键词： site testing atmospheric effects methods:data analysis telescopes Earth

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Ordered Bicontinuous Network Structures Regulated by Orientational Interactions in a Rod-Coil Block Copolymer

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Chinese Journal of Polymer Science 2024年第5期42卷 636-642,I0008页

作者： xiao-Lin Lyu Shi-Chu Yang An-qi xiao Ping-Ping Hou Wei Zhang Hong-Bing Pan Zhi-Hao Shen Xing-He Fan qi-Feng Zhou Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China Key Laboratory of Advanced Materials Technologies International(HongKong Macao and Taiwan)Joint Laboratory on Advanced Materials TechnologiesCollege of Materials Science and EngineeringFuzhou UniversityFuzhou350108China

The rich phase behavior of block copolymers(BCPs)has drawn great attention in recent ***,the double diamond(DD)phase is rarely obtained because of the competition between the minimization of interfacial energy and packing ***,a rod-coil BCP containing mesogen-jacketed liquid crystalline polymer is designed to acquire ordered bicontinuous network *** reduction of internal energy originating from the orientational interaction among the rod blocks can compensate for the free energy penalty of packing frustration to stabilize the DD *** resulting BCP can also experience lamellae-to-DD and double gyroid-to-lamellae transitions by changing the annealing *** results make the rod-coil BCP an excellent candidate for the self-assembly of ordered network structures,demonstrating great potential in nanopatterning and metamaterials.

关键词： Block copolymer Rod-coil Ordered bicontinuous phase Double diamond Double gyroid

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Propylene epoxidation coupled with furfural oxidation over Pt(Ⅱ?) TPP porphyrin with molecular oxygen

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Green Chemical Engineering 2024年第4期5卷 519-525页

作者： Hong-qi Li Hai-Yang Yu Yang Li xiao-qi He Xian-Tai Zhou Huizhou Research Institute Sun Yat-sen University School of Chemical Engineering and Technology Sun Yat-sen University

The development of green route for preparing propylene oxide (PO) with molecular oxygen is of significance both in academic and industrial. In this work, propylene epoxidation coupled with furfural oxidation catalyzed by platinum meso-tetraphenylporphyrin (Pt (II)TPP) has been developed. Propylene conversion and PO selectivity reached up to 56%and 83%, respectively. Meanwhile, furfural was almost completely converted to furoic *** on operando characterizations and electron paramagnetic resonance (EPR) tests, a mechanism involved high-valent Pt species was proposed. This work is expected to provide a potential application prospects for producing PO and furoic acid simultaneously in chemical industry.

关键词： Propylene Epoxidation Molecular oxygen Furfural Platinum porphyrins

Effects of Hydrogen Charging Time and Pressure on the Hydrogen Embrittlement Susceptibility of X52 Pipeline Steel Material

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 293-307页

作者： Hong-Jiang Wan xiao-qi Wu Hong-Liang Ming Jian-qiu Wang En-Hou Han School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering Northeastern UniversityShenyang110819China Institute of Corrosion Science and Technology Guangzhou510530China

The effects of hydrogen charging time and pressure on the hydrogen embrittlement(HE)susceptibility of X52 pipeline steel material are studied by slow strain rate tensile *** fracture morphologies of the specimens are observed by scanning electron *** HE susceptibility of the X52 pipeline steel material increases with an increase in both hydrogen charging time and hydrogen *** a charging time of 96 h,the HE susceptibility index reaches 45.86%,approximately 3.6 times that at a charging time of 0 ***,a charging pressure of 4 MPa results in a HE susceptibility index of 31.61%,approximately 2.5 times higher than that at a charging pressure of 0.3 MPa.

关键词： Hydrogen embrittlement X52 pipeline steel material Tubular specimen Hydrogen charging time Hydrogen charging pressure

Potential Adverse Outcome Pathways of Chlorinated Organophosphate Flame Retardants

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China CDC weekly 2024年第23期6卷 542-546,I0008-I0011页

作者： Meiyu Zhou Huilin Zhang qi xiao Kexin Li xiaoting Li Haiyan Chu Department of Environmental Genomics Jiangsu Key Laboratory of Cancer BiomarkersPrevention and TreatmentCollaborative Innovation Center for Cancer Personalized MedicineSchool of Public HealthNanjing Medical UniversityNanjing CityJiangsu ProvinceChina Department of Genetic Toxicology The Key Laboratory of Modern Toxicology of Ministry of EducationCenter of Global HealthSchool of Public HealthNanjing Medical UniversityNanjing CityJiangsu ProvinceChina Department of Nutrition and Food Safety School of Public HealthNanjing Medical UniversityNanjing CityJiangsu ProvinceChina

What is already known about this topic?Chlorinated organophosphate flame retardants(Cl-OPFRs)are frequently detected chemicals in the environment and biological samples,yet there is a lack of systematic evaluation regarding the adverse effects and toxicological mechanisms of *** is added by this report?This study utilizes the adverse outcome pathway(AOP)framework to assess the health implications and mechanisms of Cl-OPFRs,identifying multi-system toxicity,with a particular emphasis on reproductive issues and the possible toxic *** are the implications for public health practice?These results enhance knowledge of the health hazards linked to Cl-OPFRs,supporting the creation of focused risk evaluations and suitable regulatory actions.

关键词： utilize supporting Chlorin

Neuroprotective Effect and Mechanism of Tanreqing Injection on Ischemic Stroke:Insights from Network Pharmacology and in vivo Experiments

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Chinese Journal of Integrative Medicine 2024年第8期30卷 713-720页

作者： LI Zhong-hao PU xiao-qi LI Sha-sha DONG xiao-ke ZHANG Guo-qiang WANG Yu LIU Jin-min Department of Emergency China-Japan Friendship HospitalBeijing100029China Department of Neurology Beijing University of Chinese Medicine Dongfang HospitalBeijing100078China Department of Radiology China-Japan Friendship HospitalBeijing100029China Graduate School Beijing University of Chinese MedicineBeijing100029China

Objective To explore the neuroprotective effects and mechanism of Tanreqing Injection(TRQ)on treating ischemic stroke based on network pharmacology and in vivo experimental *** The chemical compounds of TRQ were retrieved based on published data,with targets retrieved from PubChem,Therapeutic Target Database and *** visualization and analysis were performed using Cytoscape,with protein-protein interaction networks derived from the STRING *** analysis was performed using Kyoto Encyclopedia of Genes Genomes pathway and Gene Ontology *** in vivo experiments,the middle cerebral artery occlusion(MCAO)model was *** volume was determined by 2,3,5-triphenyltetrazolium hydrochloride staining and protein expressions were analyzed by Western *** docking was performed to predict ligand-receptor *** We screened 81 chemical compounds in TRQ and retrieved their therapeutic *** the targets,116 were therapeutic targets for *** enrichment analysis showed that the apelin signaling pathway was a key pathway for ischemic ***,in in vivo experiment we found that administering with intraperitoneal injection of 2.5 mL/kg TRQ every 6 h could significantly reduce the infarct volume of MCAO rats(P<0.05).In addition,protein levels of the apelin receptor(APJ)/phosphatidylinositol 3-kinase(PI3K)/protein kinase B(AKT)pathway were increased by TRQ(P<0.05).In addition,41 chemical compounds in TRQ could bind to *** The neuroprotective effect of TRQ may be related to the APJ/PI3K/AKT signaling ***,further studies are needed to confirm the findings.

关键词： Tanreqing Injection Chinese medicine ischemic stroke middle cerebral artery occlusion quantitative estimate of drug-likeness

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Nanostructured ZnO/ZnS with Type-II Hetero-junction for Efficient CO_(2) Photoreduction

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Chemical Research in Chinese Universities 2024年第3期40卷 484-489页

作者： xiao qi LIU Ting ZHOU qianhe LI Liangyu CHANG Chuntao GAO Dawei LI Danyang YOU Feifei School of Textile Garment and Design Changshu Institute of TechnologyChangshu 215500P.R.China School of Civil and Environmental Engineering The University of New South WalesAustralia College of Textile and Clothing Yancheng Institute of Technology.Yancheng 224051P.R.China Jiangsu Yueda Cotton Spinning Co. Ltd.Yancheng 224051P.R.China

Photocatalytic CO_(2) reduction driven by solar light is a green approach that can decrease the greenhouse effect induced by high CO_(2) concentration in the atmosphere and generate carbon-based chemicals/fuels as *** this paper,non-metal co-catalysts ZnO/ZnS type-II hetero-junction nanoparticles with a rough surface were prepared through a hydrothermal *** used as a photocatalyst for CO_(2) reduction,the optimal one showed good cycle stability and a higher yield rate of 27.8µmol·g^(−1)·h^(−1) for CO_(2) conversion into *** outstanding catalytic activity originated from i)the rich interfaces between ZnO and ZnS in the nanoscale could significantly reduce the delivery path of carriers and improve the utilization efficiency of photo-excited electron/hole pairs and ii)enriched surface oxygen defects could supply much more reaction active sites for CO_(2) adsorption.

关键词： ZnO/ZnS Photocatalytic CO_(2)reduction Oxygen defect

A Degradable Quaternary Ammonium-Based Pesticide Safe for Humans

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CCS Chemistry 2024年第6期6卷 1499-1511页

作者： Wenwen Han xiao-qi Xu xiaodong Lian Yanji Chu Yapei Wang Key Laboratory of Advanced Light Conversion Materials and Biophotonics Department of ChemistryRenmin University of ChinaBeijing 100872

Reducing the emission of agrochemicals hazardous to the environment and human health is one of the key targets of the UN’s Sustainable Development Goal ***,we report a kind of quaternary ammonium pesticides with an acid-cleavable silaketal linkage on their backbones that enables control of *** pesticides possess outstanding bactericidal and insecticidal properties but become harmless to humans and other organisms after *** on the conditions of use,the hydrolytic process can be controlled over the time range of 10 min to 3 *** laboratory simulations and agricultural field demonstrations confirm that these pesticides can effectively protect crops from bacterial diseases and *** the sametime,single-dose intragastric administration using diisopropylsilyloxy bisquaternary ammonium salt 9(ISBQAS-9)in mice demonstrates its safety for multiple *** to the advantages of controllable degradability,environmental friendliness,and the low financial cost of these pesticides,this welldesigned strategy holds great promise for the generation of environmentally harmless pesticides and the development of green agriculture.

关键词： antimicrobial materials degradable pesticides insecticidal materials quaternary ammonium surfactants stimulus-cleavable chemistry

A High-Performance Electrochemical Analysis Platform for Ultrasensitive Detection of HTLV-1 DNA: Integrating Cascade Signal Amplifi cation with λ-Exonuclease-Assisted Target Recycling and Enzyme Catalysis

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Journal of Analysis and Testing 2024年第3期8卷 361-373页

作者： qi xiao Shuai Liu Yali Wang Huihao Li Mingli Yang Yi Fang Sijing Chen Shan Huang Guangxi Key Laboratory of Natural Polymer Chemistry and Physics College of Chemistry and Materials Nanning Normal University

Human T-cell lymphophilic virus type 1 (HTLV-1), the known retrovirus causing cancer in humans, is closely associated with adult T-cell leukemia/lymphoma and HTLV-1 associated myelopathy/tropical spastic paraparesis. Due to its ability to evade the host's defense mechanisms, early tracking of HTLV-1 becomes crucial. In this study, we integrateλ-Exonuclease(λ-Exo)-assisted target recycling with a terminal deoxynucleotidyl transferase (TdT)-mediated template-free DNA extension process to develop an electrochemical analysis platform for the specifi c and sensitive detection of HTLV-1 DNA. During theλ-Exo-assisted target recycling, HTLV-1 DNA is recognized by hairpin DNA (Hp-DNA), forming double-stranded DNA(dsDNA) through DNA hybridization. The dsDNA, featuring blunt 5'terminal phosphorylation, is cleaved byλ-Exo, generating abundant short output sequence (sDNA). HTLV-1 DNA is released, initiating a cyclic hybridization-cleavage ***, thiol-labelled capture DNA (CP-DNA) assembled on gold electrode surface captures a substantial amount of the generated sDNA, forming CP-DNA-sDNA nanostructures. When TdT and dNTPs are present on the electrode surface, the3'-OH terminal of sDNA extends to generate long single-stranded DNA (ssDNA) structure. Methylene blue (MB) is selected as the electrochemical signal molecule. MB not only binds with ssDNA but also interacts specifi cally with dsDNA, resulting in a signifi cantly enhanced electrochemical signal on modifi ed electrode surface. The detection limit of HTLV-1 DNA is as low as 19 amol/L (S/N=3) when the two signal amplifi cation strategies are combined. The analysis platform exhibits excellent analytical performance and holds promise as a novel tool for the early tracing and diagnosis of HTLV-1 DNA.

关键词： Cascade signal amplification Electrochemical DNA sensor Enzyme-assisted target recycling HTLV-1 DNA