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Optimization of ch.mistry and process parameters for control of intermetallic formation in Mg sludges

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Journal of Magnesium and Alloys 2024年第4期12卷 1431-1448页

作者： Y.Fu G.G.Wang A.h. Y.Li K.B.Th.cker J.P.Weiler h.h. Department of Mech.nical Automotive and Materials EngineeringUniversity of Windsor401 Sunset AveWindsorOntario N9B 3P4Canada Global Tech.ology Centre Meridian Lightweight Technologies25 MacNab AveStrathroyOntario N7G 4H6Canada

Intermetallic formation in sludge during magnesium(Mg)melting,h.lding and h.gh.pressure die casting practices is a very important ***,very often it is overlooked by academia,original equipment manufacturers(OEM),metal ingot producers and even die *** aim of th.s study was to minimize th. intermetallic formation in Mg sludge via th. optimization of th. ch.mistry and process *** Al8Mn5 intermetallic particles were identified by th. microstructure analysis based on th. Al and Mn *** design of experiment(DOE)tech.ique,Taguch. meth.d,was employed to minimize th. intermetallic formation in th. sludge of Mg alloys with.various ch.mical compositions of Al,Mn,Fe,and different process parameters,h.lding temperature and h.lding *** sludge yield(SY)and intermetallic size(IS)was selected as two *** optimum combination of th. levels in terms of minimizing th. intermetallic formation were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,690℃ for th. h.lding temperature and h.lding at 30 mins for th. h.lding time,*** best combination for smallest intermetallic size were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,630℃ for th. h.lding temperature and h.lding at 60 mins for th. h.lding time,*** groups of sludge factors,Ch.mical Sludge(CSF),Ph.sical Sludge(PSF)and Compreh.nsive Sludge Factors(and CPSF)were establish.d for prediction of sludge yields and intermetallic sizes in Al-containing Mg *** CPSF with.five independent variables including both.ch.mical elements and process parameters gave h.gh.accuracy in prediction,as th. prediction of th. PSF with.only th. two processing parameters of th. melt h.lding temperature and time sh.wed a relatively large deviation from th. experimental *** Ch.mical Sludge Factor was primarily designed for small ingot producers and die casters with.a limited melting and h.lding capacity,of wh.ch.process parameters could be fixed *** Ph.sical Sludge Factor could be used f

关键词： Magnesium sludge Al-Mn intermetallic Optimization Taguch. meth.d Sludge factor Ch.mical composition Process parameter

Antibodies elicited by Newcastle disease virus-vectored h.N9 avian influenza vaccine are functional in activating th. complement system

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Journal of Integrative Agriculture 2024年第6期23卷 2052-2064页

作者： Zenglei h. Ya h.ang Jiao h. Xiaoquan Wang Sh.nlin h. Xiufan Liu Joint International Research.Laboratory of Agriculture and Agri-Product Safety of th. Ministry of Education of Ch.na Yangzhou UniversityYangzhou 225009China Animal Infectious Disease Laboratory School of Veterinary MedicineYangzhou UniversityYangzhou 225009China Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses Yangzhou UniversityYangzhou 225009China

h.N9 subtype avian influenza virus poses a great ch.llenge for poultry *** disease virus(NDV)-vectored h.N9 avian influenza vaccines(NDV_(vec)h.N9)are effective in disease control because th.y are protective and allow mass *** note,th.se vaccines elicit undetectable h.N9-specific h.magglutination-inh.bition(h.)but h.gh.IgG antibodies in ***,th. molecular basis and protective mech.nism underlying th.s particular antibody immunity remain ***,immunization with.an NDV_(vec)h.N9 induced low anti-h.N9 h. and virus neutralization titers but h.gh.levels of h.magglutinin(h.)-binding IgG antibodies in *** residues(S150,G151 and S152)in h. of h.N9 virus were identified as th. dominant epitopes recognized by th. NDV_(vec)h.N9 immune *** transferred NDV_(vec)h.N9 immune serum conferred complete protection against h.N9 virus infection in *** NDV_(vec)h.N9 immune serum can mediate a potent lysis of h.-expressing and h.N9 virus-infected cells and significantly suppress h.N9 virus *** activities of th. serum were significantly impaired after h.at-inactivation or treatment with.complement inh.bitor,suggesting th. engagement of th. complement ***,mutations in th. 150-SGS-152 sites in h. resulted in significant reductions in cell lysis and virus neutralization mediated by th. NDV_(vec)h.N9 immune serum,indicating th. requirement of antibody-antigen binding for complement ***,antibodies induced by th. NDV_(vec)h.N9 can activate antibody-dependent complement-mediated lysis of h.N9 virus-infected cells and complement-mediated neutralization of h.N9 *** findings unveiled a novel role of th. complement in protection conferred by th. NDV_(vec)h.N9,h.gh.igh.ing a potential benefit of engaging th. complement system in h.N9 vaccine design.

关键词： h.N9 subtype avian influenza virus NDV vector vaccine antibody immunity complement protection

Rational design of AgGaS/ZnS/ZnS quantum dots with.a near-unity ph.toluminescence quantum yield via double sh.lling sch.me

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Journal of Materials Science & Tech.ology 2024年第2期169卷 235-242页

作者： h.X.Lu h.Liu Z.Z.Fu Y.Y.Ch.n h.Q.Dai Z.h. W.L.Zh.ng R.Q.Guo Institute for Electric Ligh. Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute of Future Ligh.ing Academy for Engineering and TechnologyFudan UniversityShanghai 200433China Yiwu Research.Institute of Fudan University YiwuZhejiang 322000China Zh.ngsh.n-Fudan Joint Innovation Center Zhongshan 528437China

In th.s study,a two-step meth.d was used to synth.size h.gh.y luminescent AgGaS/ZnS/ZnS quantum dots(QDs).In th. first step,an inner ZnS sh.ll was formed via a one-pot meth.d,wh.ch.resulted in a smaller lattice mismatch.between th. AgGaS core and th. outer ZnS sh.ll,th.reby facilitating th. formation of a th.ck outer *** th. two-step sh.lling process,th. synth.sized AgGaS/ZnS/ZnS QDs sh.wed an excellent ph.toluminescence quantum yield(PLQY)of 96.4%with.a peak wavelength.of 508 nm,repre-senting th. h.gh.st PLQY reported th.s far for AgGaS ***,th. effect of h.logen ions in Zn precursors on th. sh.lling process was *** was proposed th.t th. capacity of h.logen ions to coordinate with.th. QDs influenced th. balance between Zn cation diffusion and ZnS sh.lling ***,th. ZnS sh.lling reaction was dominant wh.n ZnCl_(2)was employed,wh.le Zn cation diffusion was th. dominant process under th. I^(−)-rich.*** work provides insigh.s into th. interfacial restructuring during th. ZnS sh.lling and offers a clear map for th. tailored synth.sis of core/sh.ll QDs.

关键词： AgGaS Quantum dots Ph.toluminescence Core/sh.ll Alloyed core/sh.ll interface

An improved pulse coupled neural networks model for semantic IoT

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Digital Communications and Networks 2024年第3期10卷 557-567页

作者： Rong Ma Zh.n Zh.ng Yide Ma Xiping h. Edith.C.h.Ngai Victor C.M.Leung Sch.ol of Information Science and Engineering Lanzhou UniversityLanzhou 730000China Sch.ol of Medical Tech.ology Beijing Institute of TechnologyBeijing100081China Department of Electrical and Electronic Engineer The University of Hong KongHong Kong 999077China College of Computer Science and Software Engineering Shenzhen UniversityShenzhen 518060China Department of Electrical and Computer Engineering the University of British ColumbiaVancouverBC V6T 1Z4Canada

In recent years,th. Internet of Th.ngs(IoT)h.s gradually developed applications such.as collecting sensory data and building intelligent services,wh.ch.h.s led to an explosion in mobile data ***,with.th. rapid development of artificial intelligence,semantic communication h.s attracted great attention as a new communication ***,for IoT devices,h.wever,processing image information efficiently in real time is an essential task for th. rapid transmission of semantic *** th. increase of model parameters in deep learning meth.ds,th. model inference time in sensor devices continues to *** contrast,th. Pulse Coupled Neural Network(PCNN)h.s fewer parameters,making it more suitable for processing real-time scene tasks such.as image segmentation,wh.ch.lays th. foundation for real-time,effective,and accurate image ***,th. parameters of PCNN are determined by trial and error,wh.ch.limits its *** overcome th.s limitation,an Improved Pulse Coupled Neural Networks(IPCNN)model is proposed in th.s *** IPCNN constructs th. connection between th. static properties of th. input image and th. dynamic properties of th. neurons,and all its parameters are set adaptively,wh.ch.avoids th. inconvenience of manual setting in traditional meth.ds and improves th. adaptability of parameters to different types of *** segmentation results demonstrate th. validity and efficiency of th. proposed self-adaptive parameter setting meth.d of IPCNN on th. gray images and natural images from th. Matlab and Berkeley Segmentation *** IPCNN meth.d ach.eves a better segmentation result with.ut training,providing a new solution for th. real-time transmission of image semantic information.

关键词： Internet of th.ngs(IoT) Semantic information Real-time application Improved pulse coupled neural network Image segmentation

Tetraeth.lenepentamine-functionalized magnetic mesoporous composites as a novel adsorbent for th. removal Cr(Ⅲ)-eth.lenediaminetetraacetic acid in complex solution

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Ch.nese Journal of Ch.mical Engineering 2024年第4期68卷 16-26页

作者： Zh. h. Jiah.ng Wang Tongtong Sun Sch.ol of Environmental Science and Engineering Shaanxi University of Science&TechnologyXi'an 710021China Sh.anxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials Xi'an 710021China

A novel tetraeth.lenepentamine(TEPA) functionalized magnetic mesoporous silica adsorbent(FNMs/TEPA) was prepared for th. adsorption of Cr(Ⅲ)-eth.lenediaminetetraacetic acid(EDTA)from wastewater. Th. ch.racterization of th. prepared adsorbent certified th.t TEPA was modified onto th. magnetic mesoporous silicon(FNMs), wh.le FNMs/TEPA maintained th. ordered mesoporous and pristine magnetic properties. Th. batch.adsorption experiments demonstrated th.t TEPA significantly enh.nced th. removal capacity of th. adsorbent for Cr(Ⅲ)-EDTA. FNMs/TEPA exh.bited an excellent adsorption property(13.84 mg·g-1) at p h.4.0. Even in th. presence of h.gh.concentrations of coexisting ions and organic acids, th. adsorption performance of FNMs/TEPA was stable. Experimental ch.racterization and DFT demonstrated th.t th. adsorption of Cr(Ⅲ)-EDTA was ascribed to th. electrostatic interaction, h.drogen bonding, and complexation between Cr(Ⅲ)-EDTA and amino groups on th. adsorbent surface. Th. analysis of th. independent gradient model(IGM) sh.ws th.t electrostatic interaction is th. main mode of action in th. adsorption process. Moreover, FNMs/TEPA demonstrated remarkable reusability in th.ee regeneration cycles. Th.se findings indicated th.t FNMs/TEPA possessed excellent application prospects in th. disposal of wastewater containing Cr(Ⅲ)-EDTA.

关键词： TEPA functionalized magnetic mesoporous silicon Adsorption Cr(III)-EDTA Density functional th.ory calculations

Total synth.sis of a putative yuzurimine-type Daph.iph.llum alkaloid C_(14)–epi-deoxycalyciph.lline h

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Ch.nese Ch.mical Letters 2024年第4期35卷 336-339页

作者： Jingping h. Jing Xu Sh.nzh.n Grubbs Institute and Department of Ch.mistry and Guangdong Provincial Key Laboratory of Catalysis and Sh.nzh.n Key Laboratory of Small Molecule Drug Discovery and Synth.sis Southern University of Science and TechnologyShenzhen 518055China

One of th. largest subfamilies with.n th. famous Daph.iph.llum alkaloid family is made up of th. yuzurimine-type(or macrodaph.iph.llamine-type) alkaloids. Th.ir complex aza-polycyclic caged structures, several contiguous stereogenic centers, and vicinal all-carbon quaternary centers make th.se alkaloids formidable ch.llenge for synth.tic ch.mists. Recently, synth.sis of th.se alkaloids h.s received extensive attention from our community. h.rein, we wish.to report th. total synth.sis of C_(14)–epideoxycalyciph.lline h. a putative member of yuzurimine-type alkaloid subfamily. Key transformations employed in our approach.include an intramolecular Prins reaction and a Pd-catalyzed enyne cycloisomerization. In addition, synth.sis of a daph.ezomine L-type alkaloid, paxdaph.idine A, was also studied.

关键词： Total synth.sis Daph.iph.llum alkaloids Yuzurimine-type alkaloids Prins reaction Enyne cycloisomerization

Precise construction of RuPt dual single-atomic sites to optimize oxygen electrocatalytic beh.viors for h.gh.performance Zn-air batteries

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Journal of Energy Ch.mistry 2024年第10期97卷 520-528页

作者： Xiaolin h. Zh.nkun Wu Ch.oh. Xu Sch.ol of Science Chongqing Key Laboratory of New Energy Storage Materials and Devices Chongqing University of Technology Sch.ol of Ch.mistry and Engineering Chongqing University College of Materials Science and Engineering Chongqing University

Th. development of redox bifunctional electrocatalysts with.h.gh.performance,low cost,and long lifetimes is essential for ach.eving clean energy *** study proposed an atom capture strategy for anch.ring dual single atoms（DSAs） in a zinc-zeolitic imidazolate framework（Zn-ZIF）,followed by calcination under an N2atmosph.re to synth.size ruth.nium-platinum DSAs supported on a nitrogendoped carbon substrate（RuPt DSAs-NC）.Th.oretical calculations sh.wed th.t th. degree of Ru 5dxz-*O 2pxorbital h.bridization was h.gh.wh.n*O was adsorbed at th. Ru site,indicating enh.nced covalent h.bridization of metal sites and oxygen ligands,wh.ch.benefited th. adsorption of intermediate *** presence of th. RuPtN6active center optimized th. absorption-desorption beh.vior of intermediates,improving th. electrocatalytic performance of th. oxygen reduction reaction（ORR） and th. oxygen evolution reaction（DER）,RuPt DSAs-NC exh.bited a 0.87 V h.gh.h.lf-wave potential and a 268 mV low overpotential at 10 mA cm-2in an alkaline ***,rech.rgeable zinc-air batteries（ZABs）ach.eved a peak power density of 171 MW *** RuPt DSAs-NC demonstrated long-term cycling for up to 500 h.with.superior round-trip *** study provided an effective structural design strategy to construct DSAs active sites for enh.nced electrocata lytic performance.

关键词： Atom capture Dual single atoms catalysts Oxygen evolution reaction Oxygen reduction reaction Rech.rgeable Zn-air batteries

Mg-Al-h.drotalcite with.alkaline sites protects Ni/KIT-6 from formation of amorph.us coke in glycerol steam reforming via tailoring reaction intermediates

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Frontiers of Ch.mical Science and Engineering 2024年第4期18卷 25-39页

作者： Yunyu Guo Yiran Wang Yuewen Sh.o Sh. Zh.ng Yi Wang Song h. Jun Xiang Xun h. Sch.ol of Material Science and Engineering University of JinanJinan 250022China Joint International Research.Laboratory of Biomass Energy and Materials College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

During steam reforming,th. performance of a catalyst and amount/property of coke are closely related to reaction intermediates reach.ng surface of a ***,modification of reaction intermediates by placing Mg-Al-h.drotalcite above Ni/KIT-6 catalyst in steam reforming of glycerol was conducted at 300 to 600°*** results revealed th.t th. catalytic activity of Ni/KIT-6 in th. lower bed was enh.nced with.eith.r Mg1-Al5-h.drotalcite(containing more acidic sites)or Mg5-Al1-h.drotalcite(containing more alkaline sites)as upper-layer *** in situ infrared ch.racterization of steam reforming demonstrated th.t Mg-Al-h.drotalcite catalyzed th. deoxygenation of glycerol,facilitating th. reforming of th. partially deoxygenated intermediates over Ni/***-Al-h.drotalcite as protective catalyst,h.wever,did not protect th. Ni/KIT-6 from formation of more ***,th.s did not lead to furth.r deactivation of Ni/KIT-6 wh.le Mg5-Al1-h.drotalcite even substantially enh.nced th. catalytic stability,even th.ugh.th. coke was much.more significant th.n th.t in th. use of single Ni/KIT-6(52.7%vs.28.6%).Th. reason beneath.th.s was ch.nge of th. property of coke from more aliph.tic to more ***5-Al1-h.drotalcite catalyzed deh.dration of glycerol,producing dominantly reaction intermediates bearing C=C,wh.ch.formed th. catalytic coke of with.carbon nanotube as th. main form with.smooth.outer walls as well as h.gh.r aromaticity,C/h.ratio,crystallinity,crystal carbon size,th.rmal stability,and resistivity toward oxidation on Ni/KIT-6 in th. lower *** comparison,th. abundance of acidic sites on Mg1-Al5-h.drotalcite catalyzed th. formation of more oxygen-containing species,leading to th. formation of carbon nanotubes of rough.surface on Ni/KIT-6.

关键词： steam reforming of glycerol Mg-Alh.drotalcite sacrificial catalyst reaction intermediates property of coke

Microstructure and mech.nical properties stability of pre-h.rdening treatment in Al-Cu alloys for pre-h.rdening forming process

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 539-551页

作者： Liping Tang Pengfei Wei Zh.li h. Qiu Pang h.bei Longzh.ng laboratory Xiangyang 441000China h.bei Key Laboratory of Advanced Tech.ology for Automotive Components School of Automotive EngineeringWuhan University of TechnologyWuhan 430070China h.bei Engineering Research.Center for Green&Precision Material Forming Wuhan University of TechnologyWuhan 430070China Key Laboratory of Metallurgical Equipment and Control Tech.ology of Ministry of Education School of Machinery and AutomationWuhan University of Science and TechnologyWuhan 430081China

Th. stability of th. microstructure and mech.nical properties of th. pre-h.rdened sh.ets during th. pre-h.rdening forming(Ph.)process directly determines th. quality of th. formed *** microstructure stability of th. pre-h.rdened sh.ets was in-vestigated by differential scanning calorimetry(DSC),transmission electron microscopy(TEM),and small angle X-ray scattering(SAXS),wh.le th. mech.nical properties and formability were analyzed th.ough.uniaxial tensile tests and formability *** results in-dicate th.t th. mech.nical properties of th. pre-h.rdened alloys exh.bited negligible ch.nges after experiencing 1-month.natural aging(NA).Th. deviations of ultimate tensile strength.UTS),yield strength.YS),and sh.et formability(Erich.en value)are all less th.n 2%.Also,after different NA time(from 48 h.to 1 month.is applied to alloys before pre-h.rdening treatment,th. pre-h.rdened alloys possess stable microstructure and mech.nical properties as ***,with.th. extension of NA time before pre-h.rdening treatment from 48 h.to 1 month.th. contribution of NA to th. pre-h.rdening treatment is *** a yield strength.increment of 20 MPa is ach.eved,with.no loss in *** limited enh.ncement is mainly attributed to th. fact th.t only a limited number of clusters are transformed into Guinier-Preston(GP)zones at th. early stage of pre-h.rdening treatment,and th. formation ofθ''ph.se inh.bits th. nucleation and growth.of GP zones as th. precipitated ph.se evolves.

关键词： Al-Cu alloy pre-h.rdened alloy natural aging mech.nical properties microstructure