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Experimental and Numerical Studies on Sea Sand Concrete Filled Stainless Steel Tube with Inner FRP Tube Subjected to Axial Compression

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China Ocean Engineering 2023年第2期37卷 272-287页

作者： ZENG lan YU Wen-lan MO Zi-yong huanG shi-qing YUAN Hong MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction EngineeringJinan UniversityGuangzhou 510632China Construction Engineering Quality and Safety Supervision Station of Renshou County Meishan 620500China School of Architectural Engineering Guangzhou Institute of Science and TechnologyGuangzhou 510540China

Since fibre-reinforced polymer(FRP) and stainless steel(SS) offer advantages of corrosion resistance and hybrid confinement, this study proposed a new type of composite column: sea sand concrete(SSC)-filled SS tubular columns with an inner FRP tube(CFSTFs) to help exploit abundant ocean resources in marine engineering. To study compressive behaviours of these novel members, eight CFSTFs and two SSC-filled SS tubular columns(CFSTs)were tested under axial compression. Their axial load-displacement curves, axial load-strain curves in SS or FRP tubes were obtained, and influences of key test parameters(the existence of glass FRP(GFRP) tubes, steel tube shapes, and GFRP tube thicknesses and diameters) were discussed. Further, specimen failure mechanism was analyzed employing the finite element method using ABAQUS software. Test results confirmed the excellent ductility and load-bearing capacity of CFSTFs. The existence of GFRP tubes inside can postpone SS tube buckling, and the content of inner FRP tubes, particularly increasing diameters, was found to improve compressive behaviours. GFRP contents helped develop the second elastic-plastic stage of the load-displacement curves. Furthermore, the bearing capacity of CFSTFs with a circular cross-section was approximately 26% higher than that with a square cross-section, and this difference narrowed with the increase in GFRP ratios.

关键词： sea-sand concrete(SSC) confined concrete column fibre-reinforced polymer(FRP)tube stainless steel tube axial compression

A direct electrochemical biosensor for rapid glucose detection based on nitrogen-doped carbon nanocages

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Rare Metals 2024年第5期43卷 2184-2192页

作者： lan-lan Li Yu Zhao Li-Jia Pan Jian-Bin Xu Yi shi College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China School of Electronic Science and Engineering Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Electronic Engineering The Chinese University of HongKongHongkong 999077China

Given the increasing number of diabetic patients,rapid and accurate detection of glucose in body fluids is *** study developed a direct electrochemical biosensor for glucose based on nitrogen-doped carbon nanocages(NCNCs).NCNCs possess a large specific surface area of 1395 m^(2)·g^(-1),a high N atomic content of 9.37%and good biocompatibility,which is favorable for enzyme loading and electron *** surface average concentration of electroactive glucose oxidase on NCNCs was 2.82×10^(-10)mol·cm^(-2).The NCNC-based direct electrochemical biosensor exhibited a high sensitivity of 13.7μA·(mmol·L^(-1))^(-1)·cm^(-2),rapid response time of 5 s and an impressive electron-transferrate constant(ks)of 1.87 s^(-1).Furthermore,we investigated an NCNC-based direct electron transfer(DET)biosensor for sweat glucose detection,which demonstrated tremendous promise for non-invasive wearable diabetes diagnosis.

关键词： Direct electron transfer(DET) Nitrogen-doped carbon nanocages(NCNCs) Glucose oxidase Biosensor

Tunable Phase Structure of Side-chain Liquid Crystalline Polymers Enabled by Molecular Engineering of Dual Mesogenic Cores

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Chinese Journal of Polymer Science 2024年第10期42卷 1459-1469,I0009页

作者： Wen-huan Yao lan-Sheng Liu Jie Zhao Yan-Xia Wang An-Zhi Ma Zheng-Rui Ma lan-Ying Zhang Ruo-Chen lan College of Chemistry and Chemical Engineering Hunan UniversityChangsha410082China Key Laboratory of Eco-Functional Polymer Materials of the Ministry of Education Key Laboratory of Eco-Environmental Polymer Materials of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou730070China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China Institute of Advanced Materials&Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang330022China

A series of novel side-chain liquid crystalline(SCLC)copolymers were synthesized by attaching two distinct mesogenic units,namely a chiral cholesteryl-based monomer(M1)and an achiral biphenyl-based monomer(M2),to a poly(3-mercaptopropylmethylsiloxane)(PMMS)backbone via thiol-ene click *** influence of side chain composition on the self-assembly behavior and phase structures of these SCLC copolymers was systematically investigated using different *** indicate that three distinct liquid crystalline phases and four unique molecular configurations were identified within the polymer series,with the emergence of the liquid crystalline phase being a synergistic outcome of the two distinct side *** study underscores the critical influence of side chain dimensions,rigidity,and spatial volume on the self-assembly structures and phase characteristics of liquid crystalline polymers,providing valuable insights for the rational design and development of advanced functional materials with tailored properties.

关键词： Liquid crystalline copolymers Self-assembly Phase structure Chiral molar ratio

Local and regional contributions to PM_(2.5) in the Beijing 2022 Winter Olympics infrastructure areas during haze episodes

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 499-509页

作者： Yue Wang Mengshuang shi Zhaofeng Lv huan Liu Kebin He State Key Joint Laboratory of ESPC State Environmental Protection Key Laboratory of Sources and Control of Air Pollution ComplexInternational Joint Laboratory on Low Carbon Clean Energy InnovationSchool of the EnvironmentTsinghua UniversityBeijing 100084China

The 2022 Winter Olympics is scheduled to take place in Beijing and Zhangjiakou,which were defined as OIAs(Olympic infirastructure areas)in this *** study presents the characteristics and source apportionment of PM_(2.5) in the OIAs,*** entire region of China's Mainland,except for the OIAs,was divided into 9 source regions,including four regions in the BTH(Beijing-Tianjin-Hebei)region,the four provinces surrounding the BTH and the remaining *** CAMx/PSAT,the contributions of the nine regions to the PM_(2.5) concentration in the OIAs were simulated spatially and *** simulated source apportionment results showed that the contribution of regional transportation was 48.78%,and when PM_(2.5) concentration was larger than 75μg/m^(3) central Hebei was the largest contributor with a contribution of 19.18%,followed by Tianjin,northern Hebei,Shanxi,Inner Mongolia,Shandong,southern Hebei,Henan and ***,the contribution from neighboring regions of the OIAs was 47.12%,which was nearly twice that of long-range *** episodes were analyzed,and the results presented the importance of regional transportation during severe PM_(2.5) pollution *** was also found that they were associated with differences in pollution sources between Zhangjiakou and *** transportation was the main factor affecting PM_(2.5) pollution in Zhangjiakou due to its low local *** weather with a low planetary boundary layer height and a low wind velocity prevented the local emitted pollutants in Beijing from being transported outside,and as a result,local emissions constituted a larger contribution in Beijing.

关键词： 2022 Winter Olympics PM_(2.5) Source apportionment

Bioinspired directional liquid transport induced by the corner effect

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Nano Research 2023年第3期16卷 3913-3923页

作者： Zhongyu shi Zhongxue Tang Bojie Xu Lei Jiang huan Liu Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China Research Institute for Frontier Science Beihang UniversityBeijing 100191China

Many natural creatures have demonstrated unique abilities in directional liquid transport(DLT)for better adapting to the local environment,which,for a long time,have inspired the material fabrication for applications in microfluidics,self-cleaning,water collection,***,DLTs aroused by the corner effect have been witnessed in various natural organisms,where liquid transports/spreads spontaneously along the corner structures in microgrooves,wedges or conical structures driven by micro-/nano-scaled capillary forces without external energy ***,these DLTs show advantages of ultrahigh speed,continuous proceeding,and/or external ***,we reviewed recent research advances on the bioinspired DLTs induced by the corner effect,as well as the involved mechanisms and the artificial counterpart materials with various *** also introduced some bioinspired materials that are capable of stimulus-responsive DLT under external ***,we suggested perspectives of the bioinspired DLTs in liquid manipulations.

关键词： directional liquid transport bioinspired materials corner effect capillary rise Laplace pressure

Treatment of Pneumocystis jirovecii pneumonia in non-human immunodeficiency virus-infected patients using a combination of trimethoprim-sulfamethoxazole and caspofungin

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World Journal of Clinical Cases 2022年第9期10卷 2743-2750页

作者： huan-huan Wu Shuang-Yan Fang Yan-Xiao Chen lan-Fang Feng Department of Respiratory Medicine Dongyang Hospital Affiliated to Wenzhou Medical UniversityDongyang 322100Zhejiang ProvinceChina

BACKGROUND Pneumocystis jirovecii pneumonia(PJP)is an infectious disease common in immunocompromised ***,the currently,the clinical characteristics of non-HIV patients with PJP infection have not been fully *** To explore efficacy of trimethoprim–sulfamethoxazole(TMP-SMX)and caspofungin for treatment of non-human immunodeficiency virus(HIV)-infected PJP *** A retrospective study enrolled 22 patients with non-HIV-infected PJP treated with TMP-SMX and caspofungin from 2019 to *** manifestations,treatment and prognosis of the patients were *** Five patients presented with comorbidity of autoimmune diseases,seven with lung cancer,four with lymphoma,two with organ transplantation and four with membranous nephropathy associated with use of immunosuppressive *** main clinical manifestations of patients were fever,dry cough,and progressive *** patients presented with acute onset and respiratory *** most common imaging manifestation was ground glass opacity around the hilar,mainly in the upper *** patients were diagnosed using next-generation sequencing,and were treated with a combination of TMP-SMX and *** them,17 patients received short-term adjuvant glucocorticoid *** patients recovered well and were discharged from *** Non-HIV-infected PJP have rapid disease progression,high risk of respiratory failure,and high *** of TMP-SMX and caspofungin can effectively treat severe non-HIVinfected PJP patients with respiratory failure.

关键词： Acquired immunodeficiency syndrome Non-human immunodeficiency virus-infected patients Immunosuppression caspofungin Mortality Pneumocystis jirovecii pneumonia

Force-Extension Curve of an Entangled Polymer Chain:A Superspace Approach

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Chinese Journal of Polymer Science 2021年第11期39卷 1345-1350页

作者： huan Gong Jian-Feng Li Hong-Dong Zhang An-Chang shi The State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China School of Computer Science and Technology Fudan UniversityHamiltonOntario Canada L8S 4M1 Department of Physics and Astronomy Mc Master UniversityShanghai 200433China

The statistical mechanics of an ideal polymer chain entangled with static topological constraints is studied using a superspace approach,in which the probability distribution of the polymer is obtained as solutions of the Fokker-Planck equation in a superspace with an inner structure characterized by the n-generator free *** theory predicts that the force-extension curve of the polymer under the topological constraints has the generic form F=kl+Z/l,where l is an effective *** from the elastic term that is linear in l,the forceextension curve contains a universal term of the form Z/*** magnitude of this topological term is determined by the topological charge number Z,which characterizes the topological nature of the static *** theoretical results are further verified by a scaling analysis based on a blob model of the chain conformations.

关键词： Topological constraints Probability distribution Polymer entanglement

Experimental study of droplet behavior in a swirl flow field induced by two kinds of guiding vanes and inlet structure optimization

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Journal of Hydrodynamics 2021年第1期33卷 104-110页

作者： shi-ying shi huan-qiang Sun Li-ming Lin Cheng-fu Zhang Jian Zhang Key Laboratory for Mechanics in Fluid Solid Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China Beijing-Hyundai Auto Beijing 100190China Engineering Technology Branch Cnooc Energy Development co.LTDTianjin 300452China

Droplet breakage is a common phenomenon in converting a pipe flow to a swirl flow in a vane-type pipe separator(VTPS)’*** evaluation of the dispersed droplet sizes after breakage is crucial to the optimum design of the inlet structure and the estimation of the oil-water separation *** paper studies the droplet behavior in a swirl flow produced by guiding *** are performed with two different guiding vanes at the inlet of the *** sizes of the produced oil droplets at the downstream of the guiding vanes are measured in situ using a Malvern Insitec *** results indicate that the streamlined deflector is superior to the semi-elliptical plate for the VTPS’optimization based on the comparison of the droplet sizes in their respective induced swirl flow fields,which can be explained by a modified *** study suggests that the use of the modified T-model is a reliable method to optimize the design of the guiding vane in the swirling generating stage.

关键词： Swirl flow field droplet breakage mechanism maximum droplet size experiment

Selective oxidation of benzyl alcohols to benzoic acid catalyzed by eco-friendly cobalt thioporphyrazine catalyst supported on silica-coated magnetic nanospheres

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Journal of Environmental Sciences 2017年第10期29卷 84-90页

作者： huan Li lan Cao Changjun Yang Zhehui Zhang Bingguang Zhang Kejian Deng Key Laboratory of Catalysis and Material Sciences of the State Ethnic Affairs Commission & Ministry of Education College of Chemistry and Material Science South-Central University For Nationalities

A novel magnetically recoverable thioporphyrazine catalyst（CoPz（S-Bu）8/SiO2@Fe3O4） was prepared by immobilization of the cobalt octkis（butylthio） porphyrazine complex（CoPz（S-Bu）8） on silica-coated magnetic nanospheres（SiO2@Fe3O4）. The composite CoPz（S-Bu）8/SiO2@Fe3O4appeared to be an active catalyst in the oxidation of benzyl alcohol in aqueous solution using hydrogen peroxide（H2O2） as oxidant under Xe-lamp irradiation,with 36.4% conversion of benzyl alcohol, about 99% selectivity for benzoic acid and turnover number（TON） of 61.7 at ambient temperature. The biomimetic catalyst CoPz（S-Bu）8was supported on the magnetic carrier SiO2@Fe3O4 so as to suspend it in aqueous solution to react with substrates, utilizing its lipophilicity. Meanwhile the CoPz（S-Bu）8can use its unique advantages to control the selectivity of photocatalytic oxidation without the substrate being subjected to deep oxidation. The influence of various reaction parameters on the conversion rate of benzyl alcohol and selectivity of benzoic acid was investigated in detail. Moreover, photocatalytic oxidation of substituted benzyl alcohols was obtained with high conversion and excellent selectivity, specifically conversion close to 70%, selectivity close to 100% and TON of 113.6 for para-position electron-donating groups. The selectivity and eco-friendliness of the biomimetic photocatalyst give it great potential for practical applications.

关键词： Cobalt thioporphyrazine Magnetic nanospheres Composite catalyst Photocatalytic oxidation Substituted benzyl alcohol Benzoic acid