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Spatial Raman mapping investigation of SERS performance related to localized surface plasmons

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Nano Research 2020年第1期13卷 138-144页

作者： yansheng Liu feng Luo IMDEA Nanoscience Faraday 9Ciudad Universitaria de Cantoblanco28049MadridSpain School of Science Universidad Autónoma de MadridCiudad Universitaria de Cantoblanco28049MadridSpain

In this research,it reported a novel three-dimensional(3D)metallic hybrid system by introducing single-layer graphene(SLG)between silver nanoparticles(NPs)and silver nano-discs(NDs)arrays(Ag NPs/SLG/Ag NDs).By combining the plasmonic metallic nanostructures and the unique physical/chemical properties of graphene,Ag NPs/SLG/Ag NDs hybrid substrate was fabricated,and it exhibited extremely high surface-enhanced Raman scattering(SERS)*** tuning the diameter of Ag NDs,the SERS performance of Ag NPs/SLG/Ag NDs hybrid substrate has been systematically *** detection limit for rhodamine 6g(R6G)could reach the concentrations as low as 1×10^−12 mol/L,and the average enhancement factor(EF)of the Ag NPs/SLG/Ag NDs substrate could reach 5.65×10^*** advantages indicated that the Ag NPs/SLG/Ag NDs hybrid substrate could be regarded as a candidate for organic molecules detection under extremely low ***,spatial Raman mapping of Ag NPs/SLG/Ag NDs with 2.5μm diameter NDs showed the larger SERE signal existed around the rim of Ag NDs which was related to the localized surface *** phenomenon was contributed by a larger electromagnetic field which was tuned by Ag NPs and the edge of Ag *** mechanism also has been confirmed by the electromagnetic simulation result.

关键词： surface-enhanced Raman scattering(SERS) graphene high performance plasmon mapping

Confined Crystallization Behaviors of Cross-linked Comb-like Copolymers

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Chinese Journal of Polymer Science 2016年第8期34卷 1039-1046页

作者： Xian-jing Gong 施德安 ying-kui yang Tao Jiang yan-feng Meng Robert K.y.Li 蒋世春 School of Materials Science andEngineering Tianjin UniversityTianjin 300072China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Collaborative Innovation Center for Advanced Origanic Chemical MaterialsFaculty of Materials Science and EngineeringHubei UniversityWuhan 430062China School of Chemistry and Materials Science Ludong UniversityYantai 264025China Department of Physics and Materials Science City University of Hong KongHong KongChina

Cross-linked PEG-based copolymers were obtained via synthesis of polyethylene glycol （PEG） and methoxy polyethylene glycol （MPEG） by the bridging and/or cross-linking agent of 2,4-tolylene diisocyanate （TDI） and/or hexamethylene-l,6-diisocyanate homopolymer （HDI trimer）. The effects on the crystallization behaviors of the samples could be found with the changes in molecular weight of MC-PEG and molecular weight of SC-PEG in certain cross-linked density. It is revealed that the samples appear not to crystallize when the molecular weight of MC-PEG and SC-PEG are 1000 g/mol or less than that. The samples begin to crystallize when the molecular weight of either MC-PEG or SC-PEG reaches 2000 g/mol. The crystallinity of crystallized MC-PEG decreases with the increasing molecular weight of uncrystallized SC-PEG and the crystallinity of crystallized SC-PEG declines with the rise of molecular weight of uncrystallizable MC-PEG. The chains of SC-PEG （M_n = 2000 g/mol） can fold and align easilier than those of MC-PEG （M_n = 2000 g/mol）, when the content of PEG is the same.

关键词： PEG-based copolymers Cross-linking Comb-like Confined crystallization behavior.

A Class of Backward Doubly Stochastic Differential Equations with Discontinuous Coefficients

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Acta Mathematicae Applicatae Sinica 2014年第4期30卷 965-976页

作者： Qing-feng ZHU yu-feng SHI School of Mathematic and Quantitative Economics Shandong University of Finance and Economics Institute for Financial Studies and School of Mathematics Shandong University School of Statistics Shandong University of Finance and Economics

In this work the existence of solutions of one-dimensional backward doubly stochastic differential equations （BDSDEs） with coefficients left-Lipschitz in y （may be discontinuous） and Lipschitz in z is studied. Als... 详细信息

关键词： backward doubly stochastic differential equations backward stochastic integral comparisontheorem

A note about the cyclotomic polynomial Φ_(pq)(x) and some related results

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Applied Mathematics(A Journal of Chinese Universities) 2008年第2期23卷 245-250页

作者： ZHU feng-xiang QI Wen-feng Dept. of Appl. Math. Zhengzhou Inform. Eng. Univ. Zhengzhou 450002 China

. The expression of cyclotomic polynomial Фpq （x） is concerned for a long time. A simple and explicit expression of Фpq （x） in Z[x] has been showed. The form of the factors of Фpq （x） over F2 and the upper, l... 详细信息

关键词： cyclotomic polynomial Фpq(x) coefficient factor.

Dynamically Consistent Nonlinear Evaluations with Their Generating Functions in L^p

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Acta Mathematica Sinica,English Series 2013年第4期29卷 815-832页

作者： feng HU School of Mathematical Sciences Qufu Normal University

In this paper, we study dynamically consistent nonlinear evaluations in Lp （1 〈 p 〈 2）. One of our aim is to obtain the following result： under a domination condition, an Ft-consistent evaluation is an Sg-evaluation in Lp. Furthermore, without the assumption that the generating function g（t, w, y, z） is continuous with respect to t, we provide some useful characterizations of an εg-evaluation by g and give some applications. These results include and extend some existing results.

关键词： Backward stochastic differential equation (BSDE) dynamically consistent nonlinear evaluation g-evaluation dynamic risk measure

Ability to detect and locate gross errors on DEM matching algorithm

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International Journal of Digital Earth 2010年第1期3卷 72-82页

作者： T.Zhang M.Cen Z.Ren R.yang y.feng J.Zhu Department of Surveying Engineering School of Civil EngineeringSouthwest Jiaotong UniversityChengdu 610031China College of Earth Sciences Chengdu University of TechnologyChengdu 610051China

Digital elevation model(DEM)matching techniques have been extended to DEM deformation detection by substituting a robust estimator for the least squares estimator,in which terrain changes are treated as gross ***,all existing methods only emphasise their deformation detecting ability,and neglect another important aspect:only when the gross error can be detected and located,can this system be *** paper employs the gross error judgement matrix as a tool to make an in-depth analysis of this *** theoretical analyses and experimental results show that observations in the DEM matching algorithm in real applications have the ability to detect and locate gross ***,treating the terrain changes as gross errors is theoretically feasible,allowing real DEM deformations to be detected by employing a surface matching technique.

关键词： DEM matching gross error detection gross error location gross error judgement matrix least z-different algorithm deformation detection robust estimator

Orientation-Dependent Mechanical Responses and Plastic Deformation Mechanisms of FeMnCoCrNi High-entropy Alloy:A Molecular Dynamics Study

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Acta Metallurgica Sinica(English Letters) 2021年第11期34卷 1511-1526页

作者： Hai-feng Zhang Hai-Le yan feng Fang Nan Jia Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China State Key Lab Rolling&Automat Northeastern UniversityShenyang 110819China

Mechanical properties of high-entropy alloys(HEAs)with the face-centered cubic(fcc)structure strongly depend on their initial grain ***,the orientation-dependent mechanical responses and the underlying plastic fl ow mechanisms of such alloys are not yet well ***,deformation of the equiatomic FeMnCoCrNi HEA with various initial orientations under uniaxial tensile testing has been studied by using atomistic simulations,showing the results consistent with the recent experiments on fcc *** quantitative analysis of the activated deformation modes shows that the initiation of stacking faults is the main plastic deformation mechanism for the crystals initially oriented with[001],[111],and[112],and the total dislocation densities in these crystals are higher than that with the[110]and[123]*** faults,twinning,and hcp-martensitic transformation jointly promote the plastic deformation of the[110]orientation,and twinning in this crystal is more significant than that with other *** in the crystal oriented with[123]is dominated by the hcp-martensite *** of the mechanical behaviors in the FeMnCoCrNi alloy and the conventional materials,*** and Fe50Ni50,has shown that dislocation slip tends to be activated more readily in the *** is attributed to the larger lattice distortion in the HEA than the low-entropy materials,leading to the lower critical stress for dislocation nucleation and elastic–plastic transition in the *** addition,the FeMnCoCrNi HEA with the larger lattice distortion leads to an enhanced capacity of storing ***,for the[001]-oriented HEA in which dislocation slip and stacking fault are the dominant deformation mechanisms,the limited deformation modes activated are insu fficient to improve the work hardening ability of the material.

关键词： High-entropy alloy Molecular dynamics study Mechanical response Plastic deformation mechanism

Exact elastic impedance tensor for isotropic media

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Science China Earth Sciences 2015年第6期58卷 1350-1360页

作者： ZHANG feng LI Xiangyang State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum

The existing expressions of elastic impedance,as the generalized form of acoustic impedance,represent the resistance of subsurface media to seismic waves of non-normal incidence,and thus include information on the shear-wave *** this sense,conventional elastic impedance is an attribute of the seismic reflection and not an intrinsic physical property of the subsurface *** derivation of these expressions shares the approximations made for reflectivity,such as weak impedance contrast andisotropic or weakly anisotropic media,which limits the accuracy of reflectivity reconstruction and seismic *** this paper,we derive exact elastic impedance tensors of seismic P-and S-waves for isotropic media based on the stress-velocity *** componentof the impedance tensor represents a unique mechanical property of the *** of P-wave elastic impedance tensor components are discussed for seismic inversion and *** to synthetic data and real data shows the accuracy and robust interpretation capability of the derived elastic impedance in lithology characterizations.

关键词： stress tensor velocity tensor elastic impedance inversion reservoir characterization

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A new scale for optimized cryogenic magnetocaloric effect in ErAl_2@Al_2O_3 nanocapsules

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Journal of Materials Science & Technology 2018年第5期34卷 848-854页

作者： F.Wei S.Ma L.yang y.feng J.Z.Wang A.Hua X.G.Zhao D.y.Geng Z.D.Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

The Er Al2@Al2O3 nanocapsules with Er Al2core and Al2O3 shell were synthesized by modified arc-charge *** typical core-shell structure of the nanocapsules was confirmed by high resolution transmission electron microscopy and X-ray photoelectron *** electron microscopy analysis shows the irregular sphere of the nanocapules with an average diameter of 26 *** investigation revealed the Curie temperature of Er Al2@Al2O3 nanocapsules at 20 K and the typical superparamagnetic behavior between blocking temperature and Curie *** on the blocking temperature and average diameter,the magnetocrystalline anisotropy constant of Er Al2@Al2O3nanocapsules was estimated to illustrate the magnetic contribution to *** large-SMof 14.25 J/（kg K）was obtained under 50 k Oe at 5 K.A vital parameter β was introduced in the present work to scale the optimized magnetic characteristics and the optimized mechanism was discussed in detail according to classical superparamagnetic *** results demonstrate that the optimal-SMwill be obtained when the magnetic parameter β is close to the theoretical coefficient.

关键词： Nanocapsules Magnetocaloric effect Superparamagnetic property Cryogenic refrigeration