检索结果-南通市图书馆

Chinese Chemical letters 2024年第5期35卷 290-295页

作者： Jiajia lv jie Gao Hongyu li Zeli yuan nan Dong School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China School of Pharmacy Zunyi Medical UniversityZunyi 563003China Guizhou International Scientific and Technological Cooperation Base for Medical Photo-Theranostics Technology and Innovative Drug Development Zunyi 563003China

As key biomarkers,amyloid-β(Aβ)plaques are frequently used to diagnose Alzheimer’s disease(AD).Although fluorescence imaging has proven to be effective in detecting these plaques,the gold standard probe thioflavin T(ThT),used for Aβaggregates,cannot be applied in vivo owing to its invasive ***,the development of novel fluorescent probes capable of identifying Aβplaques in situ is *** on the ThT structure,twoπ-conjugated heterocyclic D-π-A probes were designed bearing the hydroxytricyanopyrrole acceptor and n,n-dimethylaminophenyl *** probes exhibited red to near-infrared fluorescence emission(λ_(max)=732 nm),large Stokes shifts(>100 nm),exceptional signal-to-noise ratio,rapid response(nd high binding affinity(nT-HTCP=33.32 nmol/l.nF-HTCP=53.35 nmol/l)for Aβ*** the best candidate,nT-HTCP was used for in situ imaging of Aβplaques in AD mouse ***,in vivo research demonstrated that nT-HTCP could cross the blood-brain barrier and continue imaging the Aβplaques with a good signal-to-noise ***,the outcomes of the docking computations helped guide the development of the Aβ*** study expands the family of n,n-dimethylaminophenyl-based Aβ-sensitive fluorophores,with nTHTCP emerging as a highly promising imaging agent.

关键词： Amyloid-β Fluorescent probe Hydroxytricyanopyrrole Fluorescence imaging Alzheimer’s disease

Intraseasonal variability of the Kuroshio observed via mooring at 18°n

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2024年第2期42卷 468-483页

作者： Xin yUAn Qingye WAnG jie MA Shijian HU Dunxin HU Key laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China laoshan laboratory Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Insufficient observations near the origin of the Kuroshio have led to incomplete understanding of the intraseasonal variability(ISV)of the *** measurements of the Kuroshio velocity were performed with an array of three profiler moorings(122.7°E,123°E,and 123.3°E)al.ng 18°n from January 2018 to February *** ISV of the Kuroshio at 18°n was investigated based on a combination of mooring observations and global high-resolution Hybrid Coordinate Ocean Model reanalysis *** estimated time-averaged transport in the upper 350 m across the observation transect was 6.5±2.6 Sv(1.0 Sv=10^(6)m^(3)/s).Two significant ISV peaks at 50-60 and~100 d were recognized in the power spectra of the meridional velocity and *** analysis indicated that the ISV at 50-60 d was caused by westward-propagating eddies at average propagation speed of~13 cm/s and wavel.ngth of~635 *** ISV peak at~100 d was mainly caused by northward-propagating eddies generated in the north Equatorial Current *** investigation indicated that the ISV of the Kuroshio at 18°n is dominated by meridional transport,rather than by the zonal migration of the Kuroshio main *** findings provide a better understanding of the ISV of the Kuroshio east of luzon Isl.nd.

关键词： intraseasonal variability(ISV) Kuroshio mooring observation eddy

Interfacial growth of n,S-codoped mesoporous carbon onto biomass-derived carbon for superior potassium-ion storage

在线全文

学校读者我要写书评

暂无评论

nano Research 2024年第4期17卷 2619-2627页

作者： na Huang Cheng Tang Hao Jiang jie Sun Aijun Du Haijiao Zhang Institute of nanochemistry and nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China School of Chemistry and Physics and Centre for Materials Science Queensland University of TechnologyBrisbaneQLD 4001Australia Shanghai Engineering Research Center of Hierarchical.nanomaterials Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Carbonaceous materials have been recognized as one of the most promising anode materials for potassium-ion batteries(PIBs)due to their abundant raw materials,controllable structure,superior conductivity,and good chemical ***,the large radius of K ions and the low potassium content of intercalation compounds result in the sluggish storage kinetics and low reversible capacity of carbon *** this work,we present a unique heteroatom-doped carbon composite(denoted as nS-MC/SC)through a facile interfacial assembly route and simple heat-treatment process,where nS-MC is well grafted onto the biomass-derived spore carbon(SC).This unique structural design endows it with abundant mesoporous channels,expanded layer spacing,and highly doped n and *** these merits,the nS-MC/SC anode in PIBs exhibits a high reversible capacity of 350.4 mAh·g^(-1) at 100 mA·g^(-1) after 300 cycles,and an outstanding cycl.ng ***,in-situ Raman spectra further verify the high reversibility of K ions insertion/***,theoretical simulations also reveal that the n,S dual-doping is an efficient approach for improving the potassium-ion storage performance of nS-MC/SC.

关键词： mesoporous carbon(MC) biomass-derived carbon(BC) n S co-doping interfacial assembly potassium-ion batteries(PIBs)

Spray pyrolysis-derived W-doped MoSe_(2)/rGO paper-like microspheres:optimization of microstructure and mesostructure for enhanced lithium storage

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3019-3031页

作者： Wei Wang Jun-yu Chen jie Ouyang Hong yin Ao-jie li liang Chen Jun-l.n Huang yu-Can Zhu Gang-yong li Zhao-Hui Hou Key laboratory of Hunan Province for Advanced Carbon-based Functional Materials Hunan Institute of Science and TechnologyYueyang 414006China School of Chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang414006China Hunan Province Key laboratory of Materials Surface&Interface Science and Technology Material Science and Engineering SchoolCentral South University of Forestry and TechnologyChangsha 410004China International Iberian nanotechnology laboratory(Inl) AvMestre Jose Veiga4715-330 BragaPortuga

Two-dimensional MoSe_(2) is a promising candidate for lithium-ion battery ***,its conductivity and lithium storage volumetric effect still.need to be *** this work,W-doped MoSe_(2)/rGO paper-like microspheres are successfully prepared through ultrasonic spray pyrolysis,achieving optimization at both the microstructure and mesostructure to enhance the lithium storage performance of the ***,by utilizing the similar two-dimensional structure between MoSe_(2) and rGO,self-assembly is achieved through spray pyrolysis,resulting in a well-defined van der Waals heterostructure at the interface on the microscale,enhancing the electron and ion transfer capability of the ***,the mesoscale paper-like microsphere morphology provides additional volume expansion buffering ***,W-doping not only increases the interlayer spacing of MoSe_(2)(0.73 nm),thereby reducing the diffusion resistance of li+,but also allow for the modulation of the energy band structure of the *** functional theory(DFT)calculations confirm that W-doped MoSe_(2)/rGO exhibits the narrowest bandgap(0.892 eV).Therefore,the composite demonstrates excell.nt lithium storage performance,maintaining a specific capacity of 732.9 mAh·g^(-1)after 300 cycles at a current density of 1 A·g^(-1).

关键词： Molybdenum sel.nide Heterostructure Microspheres li-ion batteries Kinetics

An approach for formation design and flight performance prediction based on aerodynamic formation unit:Energy-saving considerations

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第3期37卷 77-91页

作者： nanxuan QIAO Tiel.n MA Xiangsheng WAnG jie WAnG Jingcheng FU Pu XUE School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Institute of Unmanned System Beihang UniversityBeijing 100191China Key laboratory of Advanced Technology of Intelligent Unmanned Flight System Ministry of Industry and Information TechnologyBeijing 100191China School of Transportation Science and Engineering Beihang UniversityBeijing 102206China Beijing Institute of Space l.ng March Vehicle Beijing 100076China

The performance improvement of swarm drones through aerodynamic shape optimization may be chall.nging due to folded size constraints imposed by the specific launch ***,fixed-wing aircraft swarms can benefit from formation flight in terms of energy *** study introduces the concept of the"aerodynamic formation unit",which consists of two or three aircraft that form an inseparable unit of the *** the Unmanned Aerial Vehicle(UAV)distribution and wingtip vortex interference in the formation,two typical aerodynamic formation units are optimized by the variable-fidelity aerodynamic optimization method based on space *** aerodynamic characteristics of the formation UAVs that affect flight performance,such as lift-to-drag ratio(l/D ratio)and static stability are analyzed by Computational Fluid Dynamics(CFD)*** l/D ratio(cruising condition)of the following aircraft can be increased by 22.8%and 57.5%in the optimal units that involve two and three aircraft ***,this study conducts several CFD simulations for multi-aircraft formations formed by the units,which show that the average l/D ratio of the formation can be improved by more than 19%.These results verify the feasibility and effectiveness of the"aerodynamic formation unit"concept and the optimization framework for formation parameters.

关键词： Formation flight CFD Aerodynamic formation unit Wingtip vortices Foldable tandem-wing aircraft

Metal-modulated epitaxy of Mg-doped Al_(0.80)In_(0.20)n-based layer for application as the electron blocking layer in deep ultraviolet light-emitting diodes

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2024年第5期45卷 80-89页

作者： Horacio Irán Solís-Cisneros Carlos Alberto Hernández-Gutiérrez Enrique Campos-González Máximo lópez-lópez Optomechatronics Group Tecnológico Nacional de México Campus Tuxtla Gutiérrezcarretera Panamericana 1080C.P.29050Tuxtla GutiérrezChiapasMéxico Departamento de Física Instituto Nacional de Investigaciones NuclearesCarretera México-Toluca s/nC.P.52750La Marquesa OcoyoacacMéxico Departamento de Física Centro de Investigación y estudios Avanzados del Instituto Politécnico NacionalAv.Instituto Politécnico Nacional 2508San Pedro ZacatencoGustavo A.Madero07360 Ciudad de MéxicoCDMXMéxico

This work reports the growth and characterization of p-Al.nn layers doped with Mg by plasma-assisted molecular beam epitaxy(PAMBE).Al.nn was grown with an Al molar fraction of 0.80 by metal-modulated epitaxy(MME)with a thickness of 180 nm on Si(111)substrates using Aln as buffer *** substrate temperatures were used to enhance the incorporation of indium atoms into the alloy without clustering,as confirmed by X-ray diffraction(XRD).Cathodoluminescence measurements revealed ultraviolet(UV)range ***,Hall effect measurements indicated a maximum hole mobility of 146 cm^(2)/(V∙s),corresponding to a free hole concentration of 1.23×10^(19)cm^(−3).The samples were analyzed by X-ray photoelectron spectroscopy(XPS)estimating the alloy composition and extracting the Fermi level by val.nce band ***-doped Al.nn layers were studied for use as the electron-blocking layer(EBl)in lED *** varied the Al composition in the EBl from 0.84 to 0.96 molar fraction to assess its theoretical effects on electroluminescence,carrier concentration,and electric field,using SIlVACO *** results from this study highlight the importance and capability of producing high-quality Mg-doped p-Al.nn layers through *** simulations suggest that an Al content of 0.86 is optimal for achieving desired outcomes in electroluminescence,carrier concentration,and electric field.

关键词： metal-modulated epitaxy Al.nn DUV-lED EBl simulation

Hybrid HMX multi-level assembled under the constraint of 2D materials with efficiently reduced sensitivity and optimized thermal stability

在线全文

学校读者我要写书评

暂无评论

DEFEnCE TECHnOlOGy 2024年第9期39卷 123-132页

作者： Song, Xiaomin Huang, l.ngjin Peng, Rufang Huang, Qi Xu, Jinjiang Sun, jie China Acad Engn Phys Inst Chem Mat Mianyang 621900 Peoples R China Southwest Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Environm Friendly Energy Mat Mianyang 621010 Peoples R China

The interfacial interaction between HMX molecules and coating materials is the key to the safety performance of explosives and has received extensive attention. However, screening suitable coating agents to enhance the interfacial effect to obtain high-energy and low-sensitivity explosives has l.ng been a major chall.nge. In this work, HMX-PEI/rGO/g-C3n4 (HPrGC) composites were innovatively prepared by a multi-level coating strategy of two-dimensional graphite rGO and g-C3n4. The g-C3n4 used for desensitization has a rich pi-conjugated system and shows outstanding ability in reducing friction sensitivity. The hierarchical structure of HPrGC formed by electrostatic self-assembly and pi-pi stacking can effectively dissipate energy accumulation under heat and mechanical stimulation through structural evolution, thus exhibiting a prominent synergistic desensitization effect on HMX. The results show that rGO/g-C3n4 coating has no effect on the crystal structure and chemical structure of HMX. More importantly, the perfect combination of g-C3n4 and rGO endows HPrGC with enhanced thermal stability and ideal mechanical sensitivity (IS: 21 J, FS: 216 n). Obviously, the new fabrication of HPrGC enriches the variety of desensitizer materials and helps to deepen the understanding of the interaction between explosives and coatings. (c) 2024 China Ordnance Society. Publishing services by Elsevier B.V. on behalf of KeAi CommunicationsCo. ltd. This is an open access article under the CC By-nC-nD license

关键词： HMX-PEI/rGO/g-C 3 n 4 Electrostatic self-assembly p stacking Synergistic desensitization GRAPHEnE OXIDE CRySTAlS nAnOCOMPOSITES COMPOSITES DEnSITy IMPACT

Engineering single-atom Mn on nitrogen-doped carbon to regulate lithium-peroxide reaction kinetics for rechargeable lithium-oxygen batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第7期94卷 199-207页

作者： yal.ng Huang yong liu yang liu Chenyang Zhang Wenzhang li jie li School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina School of Minerals Processing and Bioengineering Central South UniversityChangsha 4003HunanChina

Precision engineering of catalytic sites to guide more favorable pathways for li_(2)O_(2) nucleation and decom-position represents an enticing kinetic strategy for mitigating overpotential,enhancing discharge capac-ity,and improving recycl.ng stability of li-O_(2) *** this work,we employ metal-organic frameworks(MOFs)derivation and ion substitution strategies to construct atomically dispersed Mn-n_(4) moieties on hierarchical porous nitrogen-doped carbon(Mn SAs-nC)with the aim of reducing the over-potential and improving the cycl.ng stability of li-O_(2) *** porous structure provides more chan-nels for mass transfer and exposes more highly active sites for electrocatalytic reactions,thus promoting the formation and decomposition of li_(2)O_(2).The li-O_(2) batteries with Mn SAs-nC cathode achieve lower overpotential,higher specific capacity(14290 mA h g^(-1) at 100 mAg^(-1)),and superior cycle stability(>100 cycles at 200 mA g^(-1))compared with the Mn nPs-nC and *** functional theory(DFT)cal-culations reveal that the construction of Mn-n_(4) moiety tunes the charge distribution of the pyridinic n-rich vacancy and bal.nces the affinity of the intermediates(liO_(2) and li_(2)O_(2)).The initial.nucleation of li_(2)O_(2) on Mn SAs-nC favors the O_(2)-→liO_(2)→li_(2)O_(2) surface-adsorption pathway,which mitigates the overpoten-tials of the oxygen reduction(ORR)and oxygen evolution reaction(OER).As a result,Mn SAs-nC with Mn-n_(4) moiety effectively facilitates the li_(2)O_(2) nucleation and enables its reversible *** work establishes a methodology for constructing carbon-based electrocatalysts with high activity and selectivity for li-O_(2)batteries.

关键词： Single-atom Mn MOFs-oriented architecture Rechargeable li-O_(2)battery n-doped carbon Density functional theory calculation

How interfacial electron-donating defects influence the structure and charge of gold nanoparticles on TiO_(2)support

在线全文

学校读者我要写书评

暂无评论

nano Research 2024年第7期17卷 5965-5974页

作者： Guang-jie Xia yu Fu Wei Cao Jun li yang-Gang Wang Department of Chemistry and Guangdong Provincial Key laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055China School of Physical Sciences Great Bay UniversityDongguan 523000China Department of Chemistry Tsinghua UniversityBeijing 100084China

The reduction degree of TiO_(2)support is critical to the performances of metal *** many previous theoretical calculations,only the bridge oxygen vacancy(Ov)was considered as the electron-donating defect on reduced rutile TiO_(2)(r-TiO_(2−x))***,titanium adatoms(Tiad.),oxidized titanium isl.nds(***),and acid hydroxyls(ObrH)also exist at the metal/support *** conducting density functional theory(DFT)calculations and ab initio molecular dynamics(AIMD)simulations,we compared r-TiO_(2−x)surfaces with Ov,Tiad.,***,and ObrH sites loaded with Au nanoparticles(nPs).The results showed the Au nPs were oxygen-phobic but titanium-philic,resulting in wetting of Ov and *** short contact with *** and *** Bader charges of Au nPs(QM)showed a good l.near relationship with the ideal.number of donating electrons(ne)from the defective sites(QM=−Kene+QM,S),demonstrating the intrinsic electron allocation at the *** Ov,Tiad.,and *** exhibited similar slopes(Ke),relatively steeper than that of *** means in the scope of Au nP charge state,the *** *** have a close electron-donating ability with Ov,but the ObrH donates relatively fewer *** l.near relationship can be extended approximately to other *** higher the metal work function,the steeper the Ke for easier electron donation from defective *** stronger the metal oxygen affinity,the more positive the intercept(QM,S).That explains the easy generation of metallic or negative Pt and Au nPs on r-TiO_(2−x),but hard for Cu and Zn in *** provides theoretical guidance for regulating the charge of metal.nPs over TiO_(2−x)supports.

关键词： metal-support interaction titanium oxide oxygen vacancy surface hydroxyl titanium adatom

Experimental measurements of gamma-photon production and estimation of electron/positron production on the PETAl laser facility

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第5期9卷 32-47页

作者： F.Brun l.Ribotte G.Boutoux X.Davoine P.E.Masson-laborde y.Sentoku n.Iwata n.Bl.nchot D.Batani I.l.ntuéjoul l.lecherbourg B.Rosse C.Rousseaux B.Vauzour D.Raffestin E.D’Humières X.Ribeyre Centre lasers Intenses et Applications UMR 5107Universitéde Bordeaux-CNRS-CEA33405 TalenceFrance CEA DAMCESTAF-33116 Le BarpFrance CEA DAMDIFF-91297 ArpajonFrance CEA LMCEUniversitéParis-Saclay91680 Bruyères-le-ChâtelFrance Institute of laser Engineering Osaka University2-6 YamadaokaSuitaOsaka 565-0871Japan

This article reports the first measurements of high-energy photons produced with the high-intensity PETawatt Aquitaine laser(PETAl)*** experiments were performed during the commissioning of the *** laser had an energy of about 400 J,an intensity of 8×10^(18)W cm^(−2),and a pulse duration of 660 fs(FWHM).It was shot at a 2 mm-thick solid tungsten *** high-energy photons were produced mainly from the bremsstrahl.ng process for relativistic electrons accelerated inside a plasma generated on the front side of the *** paper reports measurements of electrons,protons and *** electrons up to35 MeV with a few-MeV temperature were recorded by a spectrometer,called SESAME(SpectreÉlectronS Angulaire MoyenneÉnergie).K-and l-shells were clearly detected by a photon spectrometer called SPECTIX(Spectromètre PetalàCristal en TransmIssion pour le rayonnnement X).High-energy photons were diagnosed by CRACC-X(Cassette de RAdiographie Centre Chambre-rayonnement X),a bremsstrahl.ng *** cannon analysis is strongly dependent on the hypothesis adopted for the spectral *** shapes can exhibit similar reproductions of the experimental *** eliminate dependence on the shape hypothesis and to facilitate analysis of the data,simulations of the interaction were *** model the mechanisms involved,a simulation chain including hydrodynamic,particle-in-cell,and Monte Carlo simulations was *** simulations model the preplasma generated at the front of the target by the PETAl laser prepulse,the acceleration of electrons inside the plasma,the generation of MeV-range photons from these electrons,and the response of the detector impacted by the energetic photon *** this work enabled reproduction of the experimental *** high-energy photons produced have a large emission angle and an exponential distribution *** addition to the analysis of the photon spectra,positron production was also ***,if high

关键词： process. positron hypothesis