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Experim.ntal Study on Towing Characteristics of Com.osite Bucket Wellhead Platform

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China Ocean Engineering 2024年第3期38卷 531-542页

作者： ZHANG Pu-yang LIU Ying-fei LE Cong-huan ding Hong-yan BAI Yu State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China

With the rapid developm.nt of large-scale developm.nt of m.rginal oilfields in China,sim.le wellhead platform. that are sim.le in structure and easy to install have becom. an inevitable choice in the process of oilfield ***,traditional sim.le wellhead platform. are often discarded after a single *** pursuit of a m.re costeffective approach to developing m.rginal oilfields,this paper proposes a new offshore oil field developm.nt facility—an integrated bucket foundation for wellhead *** verify the safety of its towing behavior and obtain the dynam.c response characteristics of the structure,this paper takes a bucket integrated bucket foundation for wellhead platform.with a diam.ter of 40 m.as the research *** com.ining physical m.del tests and num.rical sim.lations,it analyzes the static stability and dynam.c response characteristics of the structure during towing,com.lete with the effects of the draft,wave height,wave period,and towing point height,which produce the dynam.c responses of the structure under different influence factors,such as roll angle,pitch angle,heave acceleration and towing force as well as the sensibility to transport *** results show that the integrated bucket foundation for wellhead platform.is capable of self-floating towing,and its m.vem.nt is affected by the local environm.nt,which will provide a reference for actual projects.

关键词： com.osite bucket foundation wellhead platform air flotation towing m.del test

Hydrogen trapping and diffusion in polycrystalline nickel:The spectrum.of grain boundary segregation

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Journal of m.terials Science & Technology 2024年第6期173卷 225-236页

作者： Yu ding Haiyang Yu m.ichao Lin m.chael Ortiz Senbo Xiao Jianying He Zhiliang Zhang Departm.nt of Structural Engineering Norwegian University of Science and Technology(NTNU)Trondheim 7491Norway Division of Applied m.chanics Department of Materials Science and EngineeringUppsala UniversityUppsala 75121Sweden Graduate Aerospace Laboratories California Institute of Technology1200 E.California Blvd.PasadenaCA 91125USA

Hydrogen as an interstitial solute at grain boundaries(GBs)can have a catastrophic im.act on the m.chanical properties of m.ny *** the global research effort,the underlying hydrogen-GB interactions in polycrystals rem.in inadequately *** this study,using Voronoi tessellations and atom.stic sim.lations,we elucidate the hydrogen segregation energy spectrum.at the GBs of polycrystalline nickel by exploring all the topologically favorable segregation *** distinct peaks in the energy spectrum.are identified,corresponding to different structural *** first peak(-0.205 eV)represents the m.st favorable segregation sites at GB core,while the second and third peaks account for the sites at GB *** incorporating a therm.dynam.c m.del,the spectrum.enables the determ.nation of the equilibrium.hydrogen concentrations at GBs,unveiling a rem.rkable two to three orders of m.gnitude increase com.ared to the bulk hydrogen concentration reported in experim.ntal *** identified structures from.the GB spectrum.exhibit vastly different behaviors in hydrogen segregation and diffusion,with the low-barrier channels inside GB core contributing to short-circuit diffusion,while the high energy gaps between GB and neighboring lattice serving as on-plane diffusion *** square displacem.nt analysis further confirm. the findings,and shows that the calculated GB diffusion coefficient is three orders of m.gnitude greater than that of *** present study has a significant im.lication for practical applications since it offers a tool to bridge the gap between atom.c-scale interactions and m.croscopic behaviors in engineering m.terials.

关键词： Hydrogen em.rittlem.nt Grain boundaries Im.urity segregation Polycrystal Atom.stic sim.lations

Reconstruction of Gold Surface with Excessive Sulfur Source During Transition m.tal Disulfide Growth

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Precision Chem.stry 2024年第8期2卷 414-420页

作者： Yuling Yin Jia Li Feng ding Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Faculty of m.terials Science and Energy Engineering Shenzhen University of Advanced TechnologyShenzhen 518055People’s Republic of China

The inert gold substrate is one of the m.st com.only used substrates for synthesizing transition m.tal dichalcogenides(Tm.Cs),while the growth m.chanism.of Tm.Cs on gold substrates in a sulfur-rich environm.nt is still *** on density functional theory calculations,we explored the reconstruction of the gold surface in a sulfur-rich environm.nt,which is one of the conditions for the growth of *** clearly revealed that both Au(100)and Au(111)surfaces tend to form.m.tal sulfide buffer layers between Tm.Cs and the m.tallic substrate,which are the square pattern of Au4S4 on Au(100)surface and the hexagonal pattern of Au6S6 on Au(111)surface,*** the sulfur-rich environm.nt,both square and hexagonal patterns are energetically highly stable,greatly weakening the interaction between Tm.Cs and the ***,both buffer layers inherit the sym.etry of the substrate and thus have no significant effect on the growth behavior of *** study explains m.ny experim.ntal puzzles and elucidates the growth behavior of 2D m.terials on various substrates.

关键词： m.S2 Au-S reconstruction Au substrate growth m.chanism alignm.nt

Nanostructured AlFeO_(3) thin film. as a novel photoanode for photoelectrochem.cal water splitting

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Nano Research 2024年第3期17卷 1075-1085页

作者： Xin Sun m.n Wang Qi Geng Shuailin Chen Xiaojun Lv Xunlei ding m.icheng Li State Key Laboratory of Alternate Electrical Power System.with Renewable Energy Sources School of New EnergyNorth China Electric Power UniversityBeijing 102206China School of m.them.tics and Physics North China Electric Power UniversityBeijing 102206China

The earth-abundant and robust alum.num.ferrite,AlFeO_(3)(AFO),is m.inly studied in the context of ***,we dem.nstrate that AFO can be used as a stable solar absorber in photoelectrochem.cal cells for solar water splitting,exhibiting attractive *** is the first report on the photoelectrochem.cal activity of *** thin-film.photoelectrodes prepared by solution-processing m.thods are com.osed of vertically oriented thin nanosheets,featuring the rhom.ohedral sym.etry(R3c)and n-type *** as-prepared AFO photoanodes generate a photocurrent density of+0.78 m.·cm.(-2) at 1.23 V *** hydrogen electrode(RHE)with the photocurrent _(onset) potential(U_(onset))close to the flat band potential of 0.5 V *** in the presence of hole ***,the U_(onset) of AFO for solar water splitting coincides with the flat band potential as well,which is rare in n-type inorganic *** also report other properties of AFO associated with photoelectrochem.cal *** film. exhibit a band gap energy of 2.31 eV and positive band edges with low ***,the carrier lifetim.s in AFO film. are up to m.llisecond tim.scales under the m.diation of defect *** on the photoelectrochem.cal behavior and optoelectronic properties,we believe that AFO has great potential for application in photoelectrochem.cal cells.

关键词： AlFeO_(3) photoanode nanosheets photoelectrochem.stry onset potential

On the Preparation of Low-Tem.erature-Rise and Low-Shrinkage Concrete Based on Phosphorus Slag

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Fluid Dynam.cs & m.terials Processing 2024年第4期20卷 803-814页

作者： Jianlong Jin Jingjing ding Long Xiong m.ng Bao Peng Zeng China Construction Ready m.xed Concrete Co. Ltd.Wuhan430000China

The effects of different contents of a m.O expansive agent and phosphorus slag on the m.chanical properties,shrinkage behavior,and the heat of hydration of concrete were *** slum. flow,setting tim.,dry shrinkage,and hydration heat were used as sensitive param.ters to assess the response of the considered *** shown by the results,in general,with an increase in the phosphorus slag content,the hydration heat of concrete decreases for all ages,but the early strength displays a downward trend and the dry shrinkage rate *** 90-d strength and dry shrinkage of concrete could be im.roved with a phosphorus residue content between 0%-20%,with the best perform.nces in term. of m.chanical properties and shrinkage characteristics being achieved for a content of 20 kg/m.(3).On the basis of these results,it can be concluded that appropriate am.unts of phosphorus slag and m.O expansive agent can be used to im.rove the com.ressive strength of concrete in the later stage by reducing the hydration heat and dry shrinkage rate,respectively.

关键词： Phosphorus slag m.O expansion agent m.ss concrete hydration heat

Im.rovem.nts in energy saving and therm.l com.ort for electric vehicles in sum.er through coupled electrochrom.c and radiative cooling sm.rt windows

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Building Sim.lation 2024年第8期17卷 1231-1251页

作者： Zhoujie Duan Shuangdui Wu Hongli Sun Borong Lin Pei ding Tao Cui Jerem. To Xi Zhang College of Architectureand Environm.nt Sichuan UniversityChengdu610065China Departm.nt of Building Science Tsinghua UniversityBejing 100084China KeyLaboratoryofEco Planning&Green Building MinistryofEducationTsinghua UniversityBeijing100084China State Key Laboratory of Hydraulics and m.untain River Engineering Sichuan UniversityChengdu 610065China School of Em.rgencym.nagem.nt Xihua UniversityChengdu 610039China Departm.nt of PSVD Mercedes-benz Group China Ltd.Beijing 100102China

In hot clim.tes,the large am.unt of cooling load in electric vehicle(EV)results in a lot of battery energy consum.tion,leading the decrease of driving *** the widespread application of windows in EV,the electrochrom.c glass(EC)shows great prospect in lowering the cooling ***,researches on the application of EC in EV lack the consideration of both passive cooling m.asures and passenger com.ort,which lim.ts the further application of *** this paper,we proposed an idea com.ining the novel techniques of both electrochrom.sm.and radiative *** fluid dynam.cs(CFD)is m.deled to sim.late the application of electrochrom.c and radiative cooling coupled sm.rt windows in hot parking conditions,exploring the im.rovem.nt effect of the window on the therm.l environm.nt,com.ort and energy saving of the *** results indicate that,under the intense sunlight with an outdoor tem.erature of 33℃,activating the air conditioning to m.intain an average interior tem.erature of 26℃,the coupled windows reduced the cooling capacity of the air conditioning by 762 W com.ared to regular windows,which can further increase the range of ***,com.ared to sim.le electrochrom.c fully colored glass,the integration of radiative cooling technology can lower the window surface tem.erature by up to 10.7℃.m.reover,com.ared to regular windows,the coupled windows lowered the standard effective tem.erature(SET*)for passengers by approxim.tely 7℃,significantly im.roving *** research findings are expected to provide guidance for optim.zing window design and enhancing the perform.nce of EV.

关键词： electrochrom.sm radiative cooling sm.rt windowel ectric vehicle cabin therm.l com.ort energy saving

Anisotropic m.crotopography surface of chitosan scaffold regulating skin precursor-derived Schwann cells towards repair phenotype prom.tes neural regeneration

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Regenerative Biom.terials 2024年第3期3卷 68-81页

作者： m.ng Cong Xia Wu Lingjie Zhu Guohao Gu Fei ding Guicai Li Haiyan Shi Key Laboratory of Neuroregenration of jiangsu and m.nistry of Education and Co-Innovation Center of Neuroregeneration Nantong UniversityNantong 226001China Departm.nt of Pathophysiology School of MedicineNantong UniversityNantong 226001China

For repairing peripheral nerve and spinal cord defects,biom.terial scaffoid-based cell-therapy was em.rged as an effective strategy,requiring the positive response of seed cells to biom.terial substrate and environm.nt *** work highlighted that the im.osed surface properties of scaffold could provide im.ortant guidance cues to adhered cells for ***,the insufficiency of native Schwann cells and unclear cellular response m.chanism. rem.ined to be *** that,this study aim.d to illum.nate the m.cropatterned chitosan-film.action on the rat skin precursor-derived Schwann cells(SKP-SCs).Chitosanfilm.with different ridge/groove size was fabricated and applied for the SKP-SCs *** indicated that SKP-SCs cultured on 30μm.size m.crogroove surface showed better oriented alignm.nt *** SKP-sCs presented sim.lar genic phenotype as repair Schwann cells,increasing expression of c-Jun,neural cell adhesion m.lecule,and neurotrophic receptor ***,SKP-SC-secretom. was subjected to cytokine array GS67 assay,data indicated the regulation of paracrine phenotype,a panel of cytokines was verifed up-regulated at secreted level and gene expression level in induced *** up-regulated cytokines exhibit a series of prom.tive neural regeneration functions,including cell survival,cell m.gration,cell proliferation,angiogenesis,axon growth,and cellular organization *** bioinform.tics ***,the effectively polarized SKP-SCs-sourced secretom.,prom.ted the proliferation and m.gration capacity of the prim.rily cultured native rat Schwann cells,and augm.nted neurites growth of the cultured m.toneurons,as well as boosted axonal regrowth of the axotom.-injured *** together,SKP-SCs obtained pro-neuroregeneration phenotype in adaptive response to the anisotropic topography surface of chitosan-film.displayed the oriented parallel growth,the transition towards repair Schwann cell genic phenot

关键词： anisotropic m.crotopography skin precursor-derived Schwann cells chitosan-flm neural regeneration phenotype regulation

m.gm.m.diated splenic m.rginal zone B cells targeting of folic acid for im.unological evasion

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Acta Pharm.ceutica Sinica B 2024年第2期14卷 808-820页

作者： Huan Wang Zhuxuan Jiang Zhiwei Guo Gan Luo Tianhao ding Changyou Zhan Departm.nt of Pharm.cology School of Basic Medical Sciences&Department of PharmacyShanghai Pudong HospitalFudan UniversityShanghai 200032China Departm.nt of Pharm.ceutical Sciences School of PharmacyNaval Medical UniversityShanghai 200433China Shanghai Engineering Research Center for Synthetic Im.unology Fudan UniversityShanghai 200032China

Folic acid is a fully oxidized synthetic folate with high bioavailability and stability which has been extensively prescribed to prevent congenital *** we revealed the im.unosuppressive effect of folic acid by targeting splenic m.rginal zone B(m.B)*** acid dem.nstrates avid binding with the Fc dom.in of im.unoglobulin m.Igm.,targeting Igm.positive m.B cells in vivo to destabilize Igm.B cell receptor(BCR)com.lex and block im.une *** induced anergy of m.B cells by folic acid provides an im.unological escaping window for *** conjugation of folic acid with therapeutic proteins and antibodies induces im.unological evasion to m.tigate the production of anti-drug antibodies,which is a m.jor obstacle to the long-term.treatm.nt of biologics by reducing curative effects and/or causing adverse *** acid acts as a safe and effective im.unosuppressant via Igm.m.diated m.B cells targeting to boost the clinical outcom.s of biologics by inhibiting the production of anti-drug antibodies,and also holds the potential to treat other indications that adverse im.une responses need to be transiently shut off.

关键词： m.m.rane-bound Igm Anti-drugantibodies Bcell anergy Folic acid m.rginal zoneBcells Bcell receptor Biologics Targeting

Efficient photocatalytic NADH regeneration with Rh-loaded Z-schem. m.diator-free system

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Chinese Chem.cal Letters 2024年第2期35卷 496-500页

作者： Yi Zhou Yiling He m.ng Gao Ningkai ding Juying Lei Yanbo Zhou State Environm.ntal Protection Key Laboratory of Environm.ntal Risk Assessm.nt and Control on Chem.cal Process East China University of Science and TechnologyShanghai 200237China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery East China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center for m.lti-m.dia Environm.ntal Catalysis and Resource Utilization East China University of Science and TechnologyShanghai 200237China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Nicotinam.de adenine dinucleotide(NADH)regeneration is necessary for the sustainable application of enzym.tic *** Rh-based com.lex[Cp^(*)Rh(bpy)(H)]+has been widely used as an im.ortant m.diator in NADH regeneration system.,but it is lim.ted by com.lexity and high ***,a Z-schem. was constructed by loading Rh onto carbon nitride nanosheets/carbon nitride quantum.dots(CN-CNQD).The resultant catalyst achieved a high yield of NADH in a m.diator-free(m.free)system.of 0.283 m.ol L^(−1) g^(−1) m.n^(−1),which is 5.29 tim.s that of pure *** enzym. introduction experim.nts confirm.d that the enzym. active product 1,4-NADH could reach 34.21%selectivity in the m.free *** research revealed that the heterojunction between CNs and CNQDs im.roved the NADH regeneration activity in the traditional m.involved system.while Rh loading was proved to optim.ze the yield and selectivity of 1,4-NADH in m.free *** im.obilized Rh shows m.re com.etitiveness than[Cp^(*)Rh(bpy)(H)]^(+).This study contributes to the construction of an m.free system.for further application in greener,lower-cost enzym.tic processes.

关键词： Photocatalysis NADH regeneration m.diator-free Carbon nitride Z-schem.