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Adhesion and surface forces in polymer tribology——A review

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Friction 2018年第2期6卷 143-155页

作者： nikolai MYSHKIN Alexander KOVALEV Metal-Polymer Research Institute of Belarus National Academy of Sciences State Key Laboratory of Tribology Tsinghua University

Polymer tribology is a fast growing area owing to increasing applications of polymers and polymer composites in industry, transportation, and many other areas of economy. Surface forces are very important for polymer contact, but the real origin of such forces has not been fully investigated. Strong adhesive interaction between polymers leads to an increase in the friction force, and hence, the asperities of the material may be removed to form wear particles or transfer layers on the counterface. The theory of polymer adhesion has not been completely elucidated yet and several models of adhesion have been proposed from the physical or chemical standpoints. This paper is focused on the research efforts on polymer adhesion with emphasis on adhesion mechanisms, which are very important in the analysis of polymer friction and wear.

关键词： friction dynamics joint clearance numerical models impact durability

Singular Solutions to Conformal Hessian Equations(Dedicated to Professor Haim Brezis on the occasion of his 70th birthday)

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Chinese Annals of Mathematics,Series B 2017年第2期38卷 591-600页

作者： nikolai NADIRASHVILI Serge VLADUT Aix Marseille Université CNRSCentrale MarseilleFrance IITP RAS B.Karetnyi9MoscowRussia

The authors show that for any ε∈]0, 1[, there exists an analytic outside zero solution to a uniformly elliptic conformal Hessian equation in a ball B ? R^5 which belongs to C^(1,ε)(B) \ C^(1,ε+)(B).

关键词： Viscosity solutions, Conformal Hessian equation, Cartan's cubic

Mechanism of Methylene Blue adsorption on hybrid laponite-multi-walled carbon nanotube particles

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Journal of Environmental Sciences 2016年第4期28卷 134-141页

作者： Maryna Manilo nikolai Lebovka Sandor Barany Institute of Biocolloidal Chemistry named after F.D. Ovcharenko National Academy of Sciences of Ukraine 42 Vernadsky blvd. 030142 Kyiv Ukraine University of Miskolc MTA-ME Materials Science Research Group and Institute of Chemistry Hungary The Transcarpathian II. Ferenc Rakoczi Hungarian Institute Beregovo Ukraine

The kinetics of adsorption and parameters of equilibrium adsorption of Methylene Blue（MB）on hybrid laponite-multi-walled carbon nanotube（NT）particles in aqueous suspensions were *** laponite platelets were used in order to facilitate disaggregation of NTs in aqueous suspensions and enhance the adsorption capacity of hybrid particles for *** were performed at room temperature（298 K）,and the laponite/NT ratio（Xl）was varied in the range of 0–*** elucidation of the mechanism of MB adsorption on hybrid particles,the electrical conductivity of the system as well as the electrokinetic potential of laponite-NT hybrid particles were *** different stages in the kinetics of adsorption of MB on the surface of NTs or hybrid laponite-NT particles were discovered to be a fast initial stage Ⅰ（adsorption time t=0–10 min）,a slower intermediate stage Ⅱ（up to t=120 min）and a long-lasting final stage Ⅲ（up to t=24 hr）.The presence of these stages was explained accounting for different types of interactions between MB and adsorbent particles,as well as for the changes in the structure of aggregates of NT particles and the long-range processes of restructuring of laponite platelets on the surface of *** analysis of experimental data on specific surface area versus the value of Xl evidenced in favor of the model with linear contacts between rigid laponite platelets and *** was also concluded that electrostatic interactions control the first stage of adsorption at low MB concentrations.

关键词： Multi-walled carbon nanotubes Laponite platelets Methylene Blue Adsorption Kinetics Zeta potential

Crystal structure and thermal expansion of perovskites containing uranium(VI) and rare-earth elements

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Journal of Rare Earths 2009年第1期27卷 4-11页

作者： Aleksandr Knyazev Anna Ershova nikolai Chernorukov Nizhny Novgorod State University

By the method of high-temperature reactions in solid phase, compounds with the general formula MⅡ（AⅢ2/3U1/3）O3（MⅡ=Sr, AⅢ=Sc, In;MⅡ=Ba, AⅢ=Sc, In, Y, Nd-Lu） were *** structures（space groups Fm 3 m and Pnma） were refined by the Rietveld method and morphotropic transition in Ba（Ln2/3U1/3）O3 on the border of Gd-Tb was *** means of high-temperature X-ray diffraction, phase transitions were studied and thermal expansion coefficients were determined.

关键词： perovskite uranium X-ray diffraction Rietveld structure thermal expansion rare earths

The m-delay Autoregressive Model with Application

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Computer Modeling in Engineering & Sciences 2020年第2期122卷 487-504页

作者： Manlika Ratchagit BenchawanWiwatanapataphee nikolai Dokuchaev School of Electrical Engineering Computing and Mathematical SciencesCurtin UniversityPerthAustralia.

The classical autoregressive(AR)model has been widely applied to predict future data usingmpast observations over five *** the classical AR model required m unknown parameters,this paper implements the AR model by reducing m parameters to two parameters to obtain a new model with an optimal delay called as the m-delay AR *** derive the m-delay AR formula for approximating two unknown parameters based on the least squares method and develop an algorithm to determine optimal delay based on a brute-force *** performance of them-delay AR model was tested by comparing with the classical AR *** results,obtained from Monte Carlo simulation using the monthly mean minimum temperature in PerthWestern Australia from the Bureau of Meteorology,are no significant difference compared to those obtained from the classical AR *** confirms that the m-delay AR model is an effective model for time series analysis.

关键词： Delay autoregressive model least squares method brute-force technique.

Plasmonic nanoparticles and nucleic acids hybrids for targeted gene delivery,bioimaging,and molecular recognition

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Journal of Innovative Optical Health Sciences 2021年第4期4卷 3-30页

作者： Timofey Pylaev Elena Avdeeva nikolai Khlebtsov Institute of Biochemistry and Physiology of Plants and Microorganisms Russian Academy of Sciences Saratov 410049Russia Razumovsky Saratov State Medical University Saratov 410012Russia Federal Center of Agriculture Research of the South-East Region Saratov 410010Russia Saratov National Research State University Saratov 410012Russia

Promising biomedical applications of hybrid materials composed of gold nanoparticles and nucleic acids have attracted strong interest from the nanobiotechnological *** particular interest is owing to the robust and easy-to-make synthetic approaches,to the versatile optical and catalytic properties of gold nanoparticles combined with the molecular recognition and programmable properties of nucleic *** significant progress is made in the develop-ment of DNA-gold nanostructures and their applications,such as molecular recognition,cell and tissue bioimaging,targeted delivery of therapeutic agents,*** review is focused on the critical discussion of the recent applications of the gold nanoparticles-nucleic acids *** effect of particle size,surface,charge and thermal properties on the interactions with functional nucleic acids is *** each of the above topics,the basic principles,recent advances,and current challenges are *** is placed on the systematization of data over the theranostic systems on the basis of the gold nanoparticles-nucleic acids ***,we start our discussion with observation of the recent data on interaction of various gold nano-particles with nucleic *** we describe existing gene delivery systems,nucleic acids detection,and bioimaging ***,we describe the phenomenon of the polymerase chain reaction improvement by gold nanoparticle additives and its potential underlying ***,we provide a short summary of reported data and outline the challenges and perspectives.

关键词： gold nanoparticles delivery DNA detection bioimaging

Utilization of Extrinsic Fabry-Perot Interferometers with Spectral Interferometric Interrogation for Microdisplacement Measurement

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Journal of Electronic Science and Technology 2020年第1期18卷 59-75页

作者： Leonid Liokumovich Aleksandr Markvart nikolai Ushakov Higher School of Applied Physics and Space Technologies Peter the Great St.Petersburg Polytechnic UniversitySt.Petersburg 195251

The paper presents a number of signal processing approaches for the spectral interferometric interrogation of extrinsic Fabry-Perot interferometers(EFPIs). The analysis of attainable microdisplacement resolution is performed and the analytical equations describing the dependence of resolution on parameters of the interrogation setup are derived. The efficiency of the proposed signal processing approaches and the validity of analytical derivations are supported by experiments. The proposed approaches allow the interrogation of up to four multiplexed sensors with attained resolution between 30 pm and 80 pm, up to three times improvement of microdisplacement resolution of a single sensor by means of using the reference interferometer and noisecompensating approach, and ability to register signals with frequencies up to 1 kHz in the case of 1 Hz spectrum acquisition rate. The proposed approaches can be used for various applications, including biomedical, industrial inspection, and others, amongst the microdisplacement measurement.

关键词： Absolute measurement dynamic measurement Fabry-Perot interferometer least-squares methods optical fiber sensors resolution analysis resolution enhancement sensor multiplexing spectral interferometry

The combined effect of optical laser and microwave radiations on a metal surface

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Chinese Physics B 2014年第2期23卷 359-363页

作者： Anatoli P Gavrilyuk nikolai Ya Shaparev Institute of Computational Modeling of Siberian Branch of Russian Academy of Sciences Akademgorodok Siberian Federal University

In this paper, it is shown that the laser radiation intensity required for complete ionization of vapors produced on an irradiated metal surface can be reduced by more than an order of magnitude through using pulsed l... 详细信息

关键词： laser microwave radiation metal surface plasma

Magnetic skyrmion bundles join the family of topological solitons

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Science China(Physics,Mechanics & Astronomy) 2022年第4期65卷 123-124页

作者： nikolai S.Kiselev Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum JülichJülich D-52425Germany

Magnetic solitons are localized magnetic textures that are similar to ordinary particles-they have defined size and can move and interact with each other. Topological solitons [1],in addition, are characterized by the so-called topological charge or topological index, which allows classifying magnetic solitons and has the following meaning.

关键词： topological solitons ordinary