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Comparative analysis of single-and multiple-frequency thermal wave radar imaging inspection of glass fiber reinforced polymer(GFRP)

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International Journal of Extreme Manufacturing 2022年第2期4卷 161-172页

作者： Lishuai Liu Andreas Mandelis Alexander melnikov Liming Wang Key Laboratory of Pressure Systems and Safety of MOE School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237People’s Republic of China Center for Advanced Diffusion-Wave and Photoacoustic Technologies(CADIPT) Department of Mechanical and Industrial EngineeringUniversity of TorontoTorontoON M5S 3G8Canada Institute for Advanced Non-Destructive and Non-Invasive Diagnostic Technologies(IANDIT) TorontoONM5S 3G8Canada Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055People’s Republic of China

Active infrared thermography has gained increasing popularity for nondestructive testing and evaluation in various industrial fields,especially for composite *** this regard,thermal wave radar(TWR)imaging is recognized as the next-generation active thermography technology to obtain great resolution and depth range over the inspected objects.A critical aspect concerns the optimal test parameter selection to guarantee reliable quality assurance required for industrial *** this work,single-and multiple-frequency TWR was investigated in a quantitative manner with the goal of optimizing the detection parameters in terms of probing range and lateral and depth *** effects of test parameters,including sampling frequency,modulation frequency,chirp duration,chirp bandwidth,etc,were investigated in detail through experiments on a glass fiber reinforced polymer specimen with multi-scale diameter-to-depth ratio *** paper aims to help yield a better understanding of the physical mechanism behind TWR and propose a workable scheme for testing parameter selection in practical applications.

关键词： GFRP thermal wave radar testing parameters nondestructive testing

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CVaR-hedging and its applications to equity-linked life insurance contracts with transaction costs

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Probability, Uncertainty and Quantitative Risk 2021年第4期6卷 343-368页

作者： Alexander melnikov Hongxi Wan Department of Mathematical and Statistical Sciences University of AlbertaT6G 2G1 EdmontonCanada

This paper analyzes Conditional Value-at-Risk(CVaR)based partial hedging and its applications on equity-linked life insurance contracts in a Jump-Diffusion market model with transaction costs.A nonlinear partial differential equation(PDE)that an option value process inclusive of transaction costs should satisfy is *** particular,the closed-form expression of a European call option price is ***,the CVaR-based partial hedging strategy for a call option is derived *** the CVaR hedging price and the weights of the hedging portfolio are based on an adjusted *** obtain estimated values of expected total hedging errors and total transaction costs by a simulation ***,our results are implemented to derive target clients’survival probabilities and age of equity-linked life insurance contracts.

关键词： Conditional Value-at-Risk Jump-diffusion model Option pricing Transaction costs Equity-linked life insurance contracts

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ON REDUCTION OF MULTICOMPONENT COSMOLOGY TO TODA LATTICE

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Chinese Physics Letters 1990年第3期7卷 97-100页

作者： V.D.Ivashchuk V.N.melnikov USSR State Committee for Standards 9 Leninsky prospectMoscow 117049USSR

We prove that Gibbons-Maeda reduction of two-component cosmology to the Toda lattice can not be generalyzed for n-component case.

关键词： MULTI lattice component

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Application of integrated simulation environment SIEMNED to the analysis of the MEPHIST-0 tokamak operation

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Plasma Science and Technology 2023年第3期25卷 222-233页

作者： D Yu SYCHUGOV S Yu SOLOVIEV A S ZHILKIN A V melnikov S A KRAT Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University National Research Centre Kurchatov Institute National Research Nuclear University Moscow Engineering Physics Institute National University Moscow Institute of Physics and Technology

This paper presents the results of numerical simulation of plasma equilibrium and stability in the MEPHIST-0 tokamak with SIEMNED software and comparison of simulation results with *** determined characteristics of the vacuum chamber show that it significantly affects the entire *** various scenarios of the inductor operation,a comparison of experimental data and simulated currents and magnetic fields induced in the chamber was carried *** steady-state tokamak operation,a numerical study of equilibrium plasma configurations was carried out depending on the currents in the poloidal magnetic field coils and plasma *** vertical plasma instability was *** limiting values of plasma ellipticity preventing the vertical plasma instability were numerically *** simulations show that plasma equilibrium is supported by induced *** was shown numerically that magnetic configuration with‘zero of higher order’were obtained before the plasma shot,suggesting consistency between the simulation results and observations.

关键词： mathematical modelling tokamak installation MEPHIST-0

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Analysis of the coronal source of the partially limb-occulted flare on 2002 July 20

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Research in Astronomy and Astrophysics 2013年第8期13卷 961-977页

作者： Jin-Hua Shen Victor melnikov Tuan-Hui Zhou Hai-Sheng Ji Key Laboratory for Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Central Astronomical Observatory at Pulkovo Russian Academy of Sciences

We carry out a detailed analysis of the X3.5 solar flare that occurred on 2002 July 20, which is the strongest partially limb-occulted flare ever observed by the RHESSI satellite. The main results are：（1） during the main impulsive phase that lasts ,-10 minutes, the motion of the thermal sources follows a U-shaped trajectory. Nonthermal sources move in a similar way, but in a series of larger zigzags. We further show that the non-thermal sources are actually leading the contraction motion. （2） During the main impulsive phase, X-ray sources at different energies continuously form a loop-like configuration, with the highest energy source （up to ,- 100 keV） and the lowest energy source （down to ,- 10 keV） being located at two ends. The entire loop-like configuration moves in a U-shaped trajectory, while keeping the order of descending energy from highest to lowest during motion. Two non-thermal hard X- ray sources with different energies are spatially well separated in the distribution. The unusual complexities of the X-ray emissions in the tenuous solar corona challenge interpretations using bremsstrahlung in a simple magnetic configuration.

关键词： Sun activity - Sun X-ray - Sun flares

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Influence of frost weathering on the recession of surfaces of technogenic landforms in Yakutia

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Research in Cold and Arid Regions 2019年第4期11卷 257-266页

作者： Andrey E.melnikov Nikolay N.Grib melnikov Permafrost Institute of the Siberian Branch of the Russian Academy of Sciences Yakutsk 677010Russia Technical Institute(branch)of M.K.Ammosov North-eastern Federal University Neryungri 678960Russia

The article assesses the influence of permafrost weathering on the rate of destruction of technogenic land forms,as exhibit ed on as illustrated by the railway embankment of the Amur Yakut mainline in the Sakha Republic(Yakutia).Studies were carried out on a railway section more than 375 km *** subsidence rate of the embankment slopes and structur al excavations was determined using laboratory methods that simulate various mechanisms of temperature(with a transi tion through 0℃)impact on *** the first time,a quantitative assessment of the influence of cryogenic weathering on the stability of the railway in the region belonging to the northern building climatic zone is *** the territory un der consideration,embankment rocks were experimentally determined to undergo more than 100 freezing and thawing cy cles during a *** the existing climatic conditions,cryogenic weathering actively affects the embankment of the railway to a depth of 30 *** of the embankment deformations detected during field observations are due to defects in the integrity of this particular *** size of the disintegrating layer of particular types of rock comprising the rail way embankment has been established as reaching 10 cm per *** 5 years following the formation of embankments comprising the upper structure of the railroad tracks,the physical and mechanical properties of rocks,which initially had a tensile strength for uniaxial compression in the range of 40 70 MPa,were reduced by more than 50%.According to the authors,the establishment of regional cryohypergenesis features is universal in nature and can be applied to solving a wide range of tasks related to the assessment and prediction of the degree of cryogenic transformation of rocks having different structural properties.

关键词： cryogenic weathering embankment railway subsidence rate Republic of Sakha Yakutia

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On Charged Black Hole in Multidimensional Theory with Ricci-Flat Internal Spaces

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Chinese Physics Letters 1991年第9期8卷 439-441页

作者： S.B.Fadeev V.D.Ivashchuk V.N.melnikov USSR State Committee for Standards 9 Leninski Prospect117049MoscowUSSR

A generalization of the Reissner-Nordstrom solution for the case of n internal Ricci-flat spaces is obtained.

关键词： Ricci generalization Reissner

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Dynamic Verification of Newton's Law and the Principal Limits in Measuring Intermediate-Range Forces

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Chinese Physics Letters 1991年第12期8卷 607-610页

作者： Kolosnitsyn N.I. LUO Jun melnikov V.N. Huaxhong University of Science and Technology Wuhan 430074

According to the controversial results of recent experiments for fifth force,we present a clasaiEcation of all poasibk types of theories leading to non-Newtonian *** theoretical analysis shows that if the interaction potential differs from the Newton's law the interactions of macro-and micro-bodies are in gen-eral dis£*** calculation also shows that Long's result can be improved by several orders if the new method proposed is used.

关键词： Newtonian orders interaction

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The contracting and unshearing motion of flare loops in the X 7.1 flare on 2005 January 20 during its rising phase

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Research in Astronomy and Astrophysics 2013年第5期13卷 526-536页

作者： Tuan-Hui Zhou Jun-Feng Wang Dong Li Qi-Wu Song Victor melnikov Hai-Sheng Ji Key Laboratory for Dark Matter and Space Science Purple Mountain Observatory Chinese Academy of Sciences Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Purple Mountain Observatory Chinese Academy of Sciences School of Physics Optoelectronic Engineering Nanjing University of Information Science and Technology Graduate University of Chinese Academy of Sciences

With the aim of studying the relationship between the relative motions of the loop-top （LT） source and footpoints （FPs） during the rising phase of solar flares, we give a detailed analysis of the X7.1 class flare that occurred on 2005 January 20. The flare was clearly observed by RHESSI, showing a distinct X-ray flaring loop with a bright LT source and two well-defined hard X-ray （HXR） FPs. In particular, we correct the projection effect for the positions of the FPs and magnetic polarity inversion line. We find that：（1） The LT source showed an obvious U-shaped trajectory. The source of the higher energy LT shows a faster downward/upward speed. （2） The evolution of FPs was temporally correlated with that of the LT source. The converging/separating motion of FPs corresponds to the downward/upward motion of the LT source. （3） The initial flare shear of this event is found to be nearly 50 degrees, and it has a fluctuating decrease throughout the contraction phase as well as the expansion phase. （4） Four peaks of the time profile of the unshearing rate are found to be temporally correlated with peaks in the HXR emission flux. This flare supports the overall contraction pic- ture of flares： a descending motion of the LT source, in addition to converging and unshearing motion of FPs. All results indicate that the magnetic field was very highly sheared before the onset of the flare.

关键词： Sun: activity -- Sun: magnetic fields -- Sun: flares

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Coulomb-actuated microbeams revisited: experimental and numerical modal decomposition of the saddle-node bifurcation

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Microsystems & Nanoengineering 2021年第3期7卷 111-123页

作者： Anton melnikov Hermann A.G.Schenk Jorge M.Monsalve Franziska Wall Michael Stolz Andreas Mrosk Sergiu Langa Bert Kaiser Fraunhofer Institute for Photonic Microsystems IPMS Dresden 01109Germany Arioso Systems GmbH Dresden 01109Germany Brandenburg University of Technology Cottbus-Senftenberg Cottbus 03046Germany

Electrostatic micromechanical actuators have numerous applicati ons in scie nee and *** many applications,they are operated in a narrow frequency range close to resonanee and at a drive voltage of low ***,new applications,such as microelectromechanical systems(MEMS)microspeakers(μSpeakers),have emerged that require operation over a wide frequency and dynamic *** the dynamic performance under such circumstances is still highly ***-of-the-art finite element analysis struggles with pull-in instability and does not deliver the necessary in formation about un stable equilibrium states *** lumped-parameter models amenable to direct physical interpretation are *** inhibits the in dispensable in-depth analysis of the dynamic stability of such *** this paper,we take a major step towards mending the *** combining the finite element method(FEM)with an arc-length solver,we obtain the full bifurcation diagram for electrostatic actuators based on prismatic Euler-Bernoulli beams.A subsequent modal analysis then shows that within very narrow error margins,it is exclusively the lowest Euler-Bernoulli eigenmode that dominates the beam physics over the entire relevant drive voltage *** experiment directly recording the deflection profile of a MEMS microbeam is performed and confirms the numerical findings with astonishing *** enables modeling the system using a single spatial degree of freedom.

关键词： bifurcation modal narrow

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