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Dynamic Analysis of A Deepwater Drilling Riser with A new Hang-off System

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ch.na Ocean Engineering 2024年第1期38卷 29-41页

作者： LI Yan-wei LIU Xiu-quan wang Jin-long ch.n Guo-ming ch.nG Yuan-jiang SHEnG Lei-xiang Centre for Offshore Engineering and Safety Technology China University of PetroleumQingdao 266580China national Engineering Laboratory of Offshore Geophysical and Exploration Equipment China University of PetroleumQingdao 266580China ch.na CnOOC Research Institute Co. Ltd.Beijing 100028China

The safety of risers in hang-off states is a vital challenge in offshore oil and gas engineering.A new hang-off system installed on top of risers is proposed for improving the security of *** approach leads to a challenging problem:coupling the dynamics of risers with a new hang-off system combined with multiple structures and complex *** accurately analyze the dynamic responses of the coupled system,a coupled dynamic model is established based on the Euler-Bernoulli beam-column theory and penalty function method.A comprehensive analysis method is proposed for coupled dynamic analysis by combining the finite element method and the newmarkβ*** analysis program is also developed in MATLAB for dynamic *** simulation results show that the dynamic performances of the risers at the top part are significantly improved by the new hang-off system,especially the novel design,which includes the centralizer and articulation *** bending moment and lateral deformation of the risers at the top part decrease,while the hang-off joint experiences a great bending moment at the bottom of the lateral restraint area which requires particular attention in design and *** platform navigation speed range under the safety limits of risers expands with the new hang-off system in use.

关键词： deepwater drilling riser new hang-off system dynamic analysis finite element method penalty function method

n-acetylserotonin alleviates retinal ischemia-reperfusion injury via HMGB1/RAGE/nF-κB pathway in rats

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International Journal of Ophthalmology(English edition) 2024年第2期17卷 228-238页

作者： Yu-Ze Zhao Xue-ning Zhang Yi Yin Pei-Lun Xiao Meng Gao Lu-ming Zhang Shuan-Hu Zhou Shu-na Yu Xiao-Li wang Yan-Song Zhao Department of Ophthalmology Affiliated Hospital of Weifang Medical UniversityWeifang 261031Shandong ProvinceChina School of Medical Imaging Weifang Medical UniversityWeifang 261053Shandong ProvinceChina Department of Anatomy Weifang Medical UniversityWeifang 261053Shandong ProvinceChina Departments of Orthopedic Surgery Brigham and Women’s HospitalHarvard Medical SchoolBostonMA 02115USA

AIM:To observe the effects of n-acetylserotonin(nAS)administration on retinal ischemia-reperfusion(RIR)injury in rats and explore the underlying mech.nisms involving the high mobility group box 1(HMGB1)/receptor for advanced glycation end-products(RAGE)/nuclear factor-kappa B(nF-κB)signaling ***:A rat model of RIR was developed by increasing the pressure of the anterior chamber of the *** male Sprague Dawley were randomly divided into five groups:sham group(n=8),RIR group(n=28),RIR+nAS group(n=28),RIR+FPS-ZM1 group(n=8)and RIR+nAS+FPS-ZM1 group(n=8).The therapeutic effects of nAS were examined by hematoxylin-eosin(H&E)staining,and retinal ganglion cells(RGCs)*** expression of interleukin 1 beta(IL-1β),HMGB1,RAGE,and nod-like receptor 3(nLRP3)proteins and the phosphorylation of nuclear factorkappa B(p-nF-κB)were analyzed by immunohistochemistry staining and Western blot *** expression of HMGB1 protein was also detected by enzyme-linked immunosorbent assay(ELISA).RESULTS:H&E staining results showed that nAS significantly reduced retinal edema and increased the number of RGCs in RIR *** nAS therapy,the HMGB1 and RAGE expression decreased significantly,and the activation of the nF-κB/nLRP3 pathway was antagonized along with the inhibition of p-nF-κB and nLRP3 protein ***,nAS exhibited an anti-inflammatory effect by reducing IL-1β*** inhibitory of RAGE binding to HMGB1 by RAGE inhibitor FPS-ZM1 led to a significant decrease of p-nF-κB and nLRP3 expression,so as to the IL-1βexpression and retinal edema,accompanied by an increase of RGCs in RIR ***:nAS may exhibit a neuroprotective effect against RIR via the HMGB1/RAGE/nF-κB signaling pathway,which may be a useful therapeutic target for retinal disease.

关键词： retinal diseases retinal ischemia—reperfusion injury n-acetylserotonin high mobility group box 1 receptor for advanced glycation end-products nuclear factor-κB rats

Promoted catalytic property of Cu/SSZ-13 by introducing a minority of Mn for nO removal from diesel engine exhaust

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ch.nese Journal of chemical Engineering 2024年第7期71卷 172-182页

作者： Runnong Yang Wuyuan Liu Zhaoying wang ming Sun Guangying Fu Zihan Gao Wenjian Jiao Rui Li Lin Yu Guangdong Provincial Laboratory of chemistry and Fine chemical Engineering Jieyang Center Jieyang 515200China Guangdong Engineering Technology Research Center of Modern Fine chemical Engineering School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006China Key Laboratory of Bioinorganic and Synthetic chemistry School of ChemistrySun Yat-sen UniversityGuangzhou 510275China Testing and Certification Business Department China Automotive Technology and Research Center Company LimitedWuhan 430056China Guangdong Foran Technology Company Limited Foshan 528000China

The Cu-exch.nged SSZ-13 with the small-pore chabazite framework is considered as a highly efficient catalyst for selective catalytic reduction of nO with nH_(3)(nH_(3)-SCR).In order to further improve the catalytic property,a series of Mn ion-assisted Cu/SSZ-13 powder catalysts were prepared by co-exch.nge method and stepwise exch.nge *** is found that the nH_(3)-SCR activity,n_(2) selectivity,hydrothermal stability and sulfur resistance of Cu/SSZ-13 are promoted by introducing a minority of Mn(0.15%to 0.23%(mass))through co-exch.nge *** results reveal that the Cu,Mn co-exch.nge enables the higher amounts of Cu^(2+)active sites,the abundant medium strong and strong acid,the optimized ratio of Lewis acid to Brønsted acid etc.,which are required for a good nH_(3)-SCR catalytic property over broad temperature range and under harsh working ***,a monolithic catalyst was prepared by impregnating a cordierite ceramic support into the coating slurry containing the optimized CuMn/SSZ-13 *** diesel engine bench tests show that Cu,Mn co-exch.nge gives the monolith catalyst a better catalytic property than commercial *** work provides an important guidance for the rational design of secondary-ion-assisted zeolites applied in nH_(3)-SCR.

关键词： MnCu/SSZ-13 Co-exch.nge Zeolite Catalysis Selective catalytic reduction

Two-dimensional bimetallic selenium-containing metal-organic frameworks and their calcinated derivatives as electrocatalysts for overall water splitting

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Frontiers in Energy 2024年第3期18卷 378-389页

作者： Zhao-ting SHAnG Tang-ming LI Bing-qian HU Min LIU wang-ting LU Fan YU Yun ZHEnG Key Laboratory of Optoelectronic chemical Materials and Devices of Ministry of Education College of Optoelectronic Materials and TechnologyJianghan UniversityWuhan 430056China Institute of new Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Department of chemical Engineering University of WaterlooWaterlooOntario N2L 3G1Canada

The use of two-dimensional(2D)layered metal-organic frameworks(MOFs)as self-sacrificial templates has been proven to be a successful method to create high-efficiency Selenium(Se)-containing electrocatalysts for overall water ***,two strategies are then utilized to introduce Se element into the Co–Fe MOF,one being the etch.ng of as-prepared MOF by SeO_(2) solution,and the other,the replacing of SCn−with SeCn−as the construction *** electrochemical activity of the pristine 2D MOF and their calcinated derivatives for catalyzing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is evaluated and further *** is found that the effect of introducing Se on improving electrochemical catalytic activity is significant for the HER ***,the calcinated derivative in the replacing method exhibits an overpotential of 235 mV for HER and 270 mV for OER at a current density of 10 mA/*** comparing the two methods of introducing Se element into MOF,similar electrocatalytic activity can be achieved on the their calcinated *** high electrochemical performance of 2D CoFe-MOF derivatives may be resulted from the unique 2D hierarchical porous structure and strong synergistic effect between different components in the material.

关键词： 2D MOF selenium(Se)-containing materials hydrogen evolution reaction(HER) oxygen evolution reaction(OER)

Enhancing the electrocatalytic performance of nitrate reduction to ammonia by in-situ nitrogen leach.ng

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ch.nese chemical Letters 2024年第2期35卷 564-569页

作者： Mimi Fu Yini Mao Hua wang Wei Luo Yimin Jiang Wei Shen ming Li Rongxing He College of chemistry and chemical Engineering Southwest UniversityChongqing 400715China

Electrochemical nitrate reduction reaction (nITRR) is regarded as a “two birds-one stone” method for the treatment of nitrate contaminant in polluted water and the synthesis of valuable ammonia, which is retarded by the lack of highly reactive and selective electrocatalysts .Herein, for the first time, nickel foam supported Co_(4) n was designed as a high-performance nITRR catalyst by an in-situ nonmetal leach.ng-induced *** the optimal potential, the Co_(4) n/nF catalyst achieves ultra-high Faraday efficiency and nH_(3) selectivity of 95.4% and 99.4%, *** situ X-ray absorption spectroscopy (XAS), together with other experiments powerfully reveal that the nitrogen vacancies produced by nitrogen leach.ng are stable and play a key role in boosting nitrate reduction to *** calculations confirm that Co_(4) n with abundant nitrogen vacancies can optimize the adsorption energies of nO_(3)^(-) and intermediates, lower the free energy (Δ G ) of the potential-determining step (*nH_(3) to nH_(3) ) and inhibit the formation of n-containing *** addition, we also conclude that the nitrogen vacancies can stabilize the adsorbed hydrogen, making H_(2) quite difficult to produce, and lowering ΔG from *nO to *nOH, which facilitates the selective reduction of *** study reveals significant insights about the in-situ nonmetal leach.ng to enhance the nITRR activity.

关键词： Co4n nitrate reduction In-situ nonmetal leach.ng nitrogen vacancy Mech.nism

Heterointerface engineering of assembled CoP_(2) on n-modified carbon as efficient trifunctional electrocatalysts for Zn-Air batteries and overall water splitting

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nano Research 2024年第5期17卷 3801-3809页

作者： Yan ch.n Zhenrui Yang Juan wang Yun Yang Xuedong He Yang wang Jiadong ch.n Yaqing Guo Xin wang Shun wang Huile Jin Wenzhou Key Lab of Advanced Energy Storage and Conversion Zhejiang Province Key Lab of Leather EngineeringCollege of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Zhejiang Engineering Research Center for Electrochemical Energy Materials and Devices Institute of New Materials and Industrial TechnologiesWenzhou UniversityWenzhou 325035China School of chemical and Biomedical Engineering Nanyang Technological UniversitySingapore 637459Singapore

Enhancing catalytic activity through modulating the interaction between n-doped carbon and metal phosphides clusters is an effective ***,the electronic structure modulation of CoP_(2) supported n-modified carbon(CoP_(2)/nC)has been designed and prepared as efficient electrocatalysts for oxygen reduction reaction(ORR),oxygen evolution reaction(OER),and hydrogen evolution reaction(HER).notably,CoP_(2)/nC-1 catalyst exhibits impressive performance in alkaline media,with an ORR half-wave potential of 0.84 V,as well as OER and HER overpotentials of 290 and 129 mV(at 10 mA·cm^(−2)),*** addition,CoP_(2)/nC-1 produces a power density as high as 172.9 mW·cm^(−2),and excellent reversibility of 100 h at 20 mA·cm^(−2) in home-made Zn-air *** experimental results demonstrate that the synergistic interactions between n modified carbon substrate and CoP_(2) material significantly enhance the kinetics of ORR,OER,and *** functional theory(DFT)calculations reveal the strong electrons redistribution of CoP_(2) induced by high-density n atoms at the interface,thus optimizing the key intermediates and significantly lower the energy barrier of *** electronic adjustments of CoP_(2) greatly enhance its kinetics of ORR/OER/HER,leading to faster *** study provides profound insights into the specific modification of CoP_(2) by n-doped carbon,enabling the construction of efficient catalysts.

关键词： two-dimensional(2D)carbon metal-organic framework cobalt phosphide zinc air battery water splitting

Photocatalytic in situ H_(2)O_(2) production and activation for enhanced ciprofloxacin degradation over CeO_(2)-Co_(3)O_(4)/g-C_(3)n_(4):key role of CeO_(2)

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Rare Metals 2024年第6期43卷 2695-2707页

作者： Hong-Jie Zhu Yi-Kai Yang ming-Hui Li Lu-ning Zou Hai-Tao Zhao Shandong Provincial Key Laboratory of chemical Energy Storage and novel Cell Technology School of Chemistry and Chemical Engin College of Ecology and Environment Anhui Normal UniversityWuhu241002China Liaoch.ng YiLu Advanced Materials Co. LtdLiaocheng 252000China

The abused ciprofloxacin antibiotics have caused significant environmental *** oxidative degradation of ciprofloxacin exhibits promising efficacy,it often entails excessive energy ***,it is necessary to explore an effective and ecologically sustainable degradation ***,we demonstrated that g-C_(3)n_(4) decorated with the coordinated CeO_(2)and Co_(3)O_(4)(CeO_(2)-Co_(3)O_(4)/Cn)exhibited effective ciprofloxacin photodegradation via in situ H_(2)O_(2) production and activation *** indicate that the introduced CeO_(2) enhances the transference of photogenerated electrons to O_(2) by adjusting the oxygen vacancy of photocatalyst,thereby increasing the generation of superoxide radicals,which in turn generate H_(2)O_(2),resulting in a 22.4-fold increase in H_(2)O_(2) generation over g-C_(3)n_(4).Moreover,the in situ H_(2)O_(2)generation facilitated by CeO_(2) is confirmed to be essential for ciprofloxacin degradation via CeO_(2)-Co_(3)O_(4)/Cn,as it provides enough oxidant for Co_(3)O_(4) to activate into hydroxyl radicals for the pollutants ***,CeO_(2)-Co_(3)O_(4)/Cn achieves a ciprofloxacin degradation ratio of 97.7%within 80 *** study introduces a novel approach that combines H_(2)O_(2) generation and activation,offering an innovative perspective for achieving clean and efficient purification of antibiotic-contaminated water.

关键词： CeO_(2) In situ H_(2)O_(2)generation Ciprofloxacin degradation Photocatalyst

Enhanced Crystallization of Poly(butylene adipate-co-terephthalate)by a Self-assembly nucleating Agent

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ch.nese Journal of Polymer Science 2024年第5期42卷 663-674,I0010页

作者： ch.ng Zhou Kun ch.n Zi-Heng Zhang Meng-Fan Jing ch.n-Tai Liu ch.ng-Yu Shen Ya-ming wang State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou450002China

Poly(butylene adipate-co-terephthalate)(PBAT)is a promising biodegradable flexible polymer but suffers from slow crystallization rate,making it less attractive for some applications like the injection-molded products in comparison with low-density polyethylene(LDPE).This work aimed to accelerate the crystallization of PBAT by adding a self-assembly nucleating agent octamethylenedicarboxylic dibenzoylhydrazide(OMBH).PBAT/OMBH composites with various OMBH contents(0 wt%,0.5 wt%,0.7 wt%,1 wt%,2 wt%,3 wt%and 5 wt%)were prepared through *** effect of OMBH on the crystallization behavior,morphologies and mech.nical properties of PBAT was *** highest nucleation efficiency value of 59.6%was achieved for PBAT with 0.7 wt%OMBH,much higher than that of 22.7%for PBAT with 0.7 wt%*** force microscopy results showed that OMBH formed fine fibers and induced the formation of transcrystalline layers of *** transform infrared spectroscopy(FTIR)combined with two-dimensional correlation spectra suggested that the intermolecular dipole-dipole n—H…O=C interactions but not hydrogen bond between OMBH and PBAT promoted the crystallization of PBAT in the initial period of *** presence of OMBH did not ch.nge the crystal form of PBAT but had positive contribution in enhancing its crystallinity and mech.nical *** work is essential for preparing PBAT with high crystallization rate,enhancing its potential applications in injection-molded products.

关键词： Poly(butylene adipate-co-terephthalate) Biodegradable Self-assembly nucleating agent Crystallization

Vacancy defect MoSeTe embedded in n and F co-doped carbon skeleton for high performance sodium ion batteries and hybrid capacitors

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Journal of Energy chemistry 2024年第3期90卷 652-664,I0014页

作者： Dehui Yang Wentao Guo Fei Guo Jiaming Zhu Gang wang Hui wang Guanghui Yuan Shenghua Ma Beibei wang State Key Laboratory of Photon-Technology in Western ch.na Energy International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics&Photon-TechnologyNorthwest UniversityXi’an 710127ShannxiChina Key Laboratory of Synthetic and natural Functional Molecule chemistry(Ministry of Education) College of Chemistry&Materials ScienceNorthwest UniversityXi’an 710127ShannxiChina School of chemistry and chemical Engineering Ankang Research Centre of New Nano-materials Science and TechnologyShaanxi University Innovation Research Institute of Advanced Energy Storage Materials and Battery Technology for Future IndustrializationAnkang UniversityAnkang 725000ShannxiChina

Sodium-ion batteries(SIBs) and hybrid capacitors(SIHCs) have garnered significant attention in energy storage due to their inherent advantages,including high energy density,cost-effectiveness,and enhanced ***,developing high-performance anode materials to improve sodium storage performa nce still remains a major ***,a facile one-pot method has been developed to fabricate a hybrid of MoSeTe nanosheets implanted within the n,F co-doped honeycomb carbon skeleton(MoSeTe/n,F@C).Experimental results demonstrate that the incorporation of large-sized Te atoms into MoSeTe nanosheets enlarges the layer spacing and creates abundant anion vacancies,which effectively facilitate the insertion/extraction of na^(+) and provide numerous ion adsorption sites for rapid surface capacitive ***,the heteroatoms n,F co-doped honeycomb carbon skeleton with a highly conductive network can restrain the volume expansion and boost reaction kinetics within the *** anticipated,the MoSeTe/n,F@C anode exhibits high reversible capacities along with exceptional cycle *** coupled with na_(3)V_(2)(PO_(4))_(3)@C(nVPF@C) to form SIB full cells,the anode delivers a reversible specific capacity of 126 mA h g^(-1) after 100 cycles at 0.1 A g^(-1).Furthermore,when combined with AC to form SIHC full cells,the anode demonstrates excellent cycling stability with a reversible specific capacity of50 mA h g^(-1) keeping over 3700 cycles at 1.0 A g^(-1).In situ XRD,ex situ TEM characterization,and theoretical calculations(DFT) further confirm the reversibility of sodium storage in MoSeTe/n,F@C anode materials during electrochemical reactions,highlighting their potential for widespread practical *** work provides new insights into the promising utilization of advanced transition metal dichalcogenides as anode materials for na^(+)-based energy storage devices.

关键词： MoSeTe n F co-doped honeycomb carbon skeleton Sodium-ion batteries Sodium-ion hybrid capacitor