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An application of space-filling curves to improve results of turbulent aerodynamics modeling with convolutional neural networks

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Chinese Journal of Aeronautics 2024年第2期37卷 81-92页

作者： mikhail PETROV Sofia ZIMINA Moscow Institute of Physics&Technology Dolgoprudny 141701Russia

When carrying out calculations for turbulent flow simulation,one inevitably has to face the choice between accuracy and speed of *** order to simultaneously obtain both a computationally efficient and more accurate model,a surrogate model can be built on the basis of some fast special model and knowledge of previous calculations obtained by more accurate base models from various test bases or some results of serial *** objective of this work is to construct a surrogate model which allows to improve the accuracy of turbulent calculations obtained by a special model on unstructured *** this purpose,we use 1D Convolutional Neural Network(CNN)of the encoder-decoder architecture and reduce the problem to a single dimension by applying space-filling *** an approach would have the benefit of being applicable to solutions obtained on unstructured *** this work,a non-local approach is applied where entire flow fields obtained by the special and base models are used as input and ground truth output ***-Allmaras(SA)model and Near-wall Domain Decomposition(NDD)method for SA are taken as the base and special models *** efficiency and accuracy of the obtained surrogate model are demonstrated in a case of supersonic flow over a compression corner with different values for angleαand Reynolds number *** conducted an investigation into interpolation and extrapolation by Re and also into interpolation byα.

关键词： Space-filling curves Convolutional neural network Domain decomposition Turbulent flows Unstructured mesh

Fritz Ackermann:a true and unequalled friend

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Geo-Spatial Information Science 2023年第2期26卷 151-152页

作者： Ed mikhail Professor Emeritus&Former Head Geomatics Engineering Purdue UniversityWest LafayetteINUSA

I am certain that several other contributors to this memorial volume have expounded on the many attributes,both professional and personal,of Professor Fritz *** is unquestionable that he was a giant in our field,on whose shoulders current and future practitioners shall stand in order to keep the wheels of progress and advancement moving forward.

关键词： moving Fritz Ackermann

From Dyakonov-Cherenkov radiation to Dyakonov surface optics

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Light(Science & Applications) 2022年第4期11卷 453-454页

作者： mikhail Dyakonov University of Montpellier MontpellierFrance

Cherenkov radiation by swift charged particles in a dielectric medium has been used for a long time as an effective means for particle detection and measurements of their *** a team led by *** Luo from Singapore considers a situation when the particle emits surface electromagnetic waves at the interface between an isotropic and a uniaxial-birefringent medium(Dyakonov surface waves6).The resulting Dyakonov-Cherenkov radiation is shown to be highly sensitive to both the value and the direction of the particle *** particular,it is shown that close to the Cherenkov threshold,the radiation intensity can be several orders of magnitude greater than that in traditional Qierenkov *** new features allow to determine simultaneously the magnitude and direction of particle velocities on a compact platform(Fig.1).

关键词： optics particle surface

Medicine has always been "Modern" and "Scientific" from ancient times to the present day

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Journal of Integrative Medicine 2019年第4期17卷 229-237页

作者： mikhail Teppone Bionion Sdn Bhd 1 Jalan Sungai Jeluh Bhmed INC PTE.LTD.

Throughout human history, doctors and healers have gathered and refined the knowledge inherited from the previous generations. Different methods of effective therapy have been designed during various historical periods;when each was developed, it was considered "modern scientific medicine" for their time. Mankind has gone through natural and social disasters and survived;hence, history has proved there was no time when medical knowledge was eironeous or ineffective. Classic medicine has grown to be divided into narrow, specialized branches, causing it to lose its holistic approach and general view on health, sickness and therapeutic methods. Many of traditional medicine's effective methods have been forgotten and removed from the mainstream medicine. It would be good for modern medical education to incorporate the general knowledge of historically effective therapeutic modalities and study practical cases. Medical students should be taught how to choose a "good method" or "good medicine" independent of when that method or remedy was discovered. However, he has to keep in mind the primary goal of medicine:"I will use treatment to help the sick according to my ability and judgment..."(from Hippocratic Oath).

关键词： Integrative medicine Alternative medicine Traditional Chinese medicine Homeopathy Cellular therapy

Self-propelled automatic chassis of Lunokhod-1： History of creation in episodes

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Frontiers of Mechanical Engineering 2016年第1期11卷 60-86页

作者： mikhail MALENKOV Science and Technology Center 'ROCAD' CJSC PolytechnicalUniversity Saint-Petersburg Russia

This report reviews the most important episodes in the history of designing the self-propelled automatic chassis of the first mobile extraterrestrial vehicle in the world, Lunokhod-1. The review considers the issues in designing moon rovers, their essential features, and the particular construction properties of their systems, mechanisms, units, and assemblies. It presents the results of exploiting the chassis of Lunokhod-1 and Lunokhod-2. Analysis of the approaches utilized and engineering solutions reveals their value as well as the consequences of certain defects.

关键词： moon rover self-propelled chassis propulsion wheel suspension soil properties cross-country ability

Tunable electrical properties of C_(60)·m-xylene and the formation of semiconducting ordered amorphous carbon clusters under pressure

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Nano Research 2022年第4期15卷 3788-3793页

作者： Zhongyan Wu Guoying Gao Jinbo Zhang Alexander soldatov Jaeyong KimLin Wang Yongjun Tian Department of Physics Institute for High Pressure ResearchHanyang UniversitySeoul 04763Republic of Korea Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China College of Physical Science and Technology Yangzhou UniversityYangzhou 225002China

Ordered amorphous carbon clusters(OACC)transformed from m-xylene solvated C_(60)(C_(60)·m-xylene)are known as the first crystalline material constructed from amorphous building blocks and have attracted a lot of *** formation mechanism and physical properties of this material are of great importance for the design of more materials with such structural *** this article,the transport and structural properties of C_(60)·m-xylene are systematically investigated under pressure using impedance spectroscopy,four-probe resistance measurements,and Raman *** is found that C_(60)·mxylene is an insulator at ambient *** resistance decreases sharply starting at the pressure around 8 GPa due to the pressure-induced dimerization of C_(60)verified by the Raman *** presence of solvent hinders further polymerization of C_(60)under higher *** temperature-dependence of resistance exhibits a semiconducting characteristic at>8-26.9 GPa,and is well described by Mott's three-dimensional variable-range hopping model(3D-VRH),indicating an insulating-tosemiconducting transition accompanied with pressure-induced *** resistance and hopping energy are both found to decrease monotonically with pressure and reach the minimum near 24 *** the pressure,resistance and hopping energy values start to rise,suggesting a transition to another semiconducting state,which is attributed to the pressure-induced formation of *** conductivity shows a large hysteresis during decompression from higher than 24 GPa,confirming a different transport behavior of the sample with retained fullerenes versus *** findings of our study suggest that the transport property of fullerene is tunable by introducing solvates and further enhance our understanding of the OACC.

关键词： fullerene solvate high pressure electrical transport dimerization insulating-semiconducting transition

Siberian silkmoth outbreaks surpassed geoclimatic barrier in Siberian Mountains

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Journal of Mountain Science 2020年第8期17卷 1891-1900页

作者： KHARUK Viacheslav I. IM Sergei T. soldatov Vladimir V. Sukachev Institute of Forest Federal Scientific CenterRussian Academy of ScienceSiberian BranchAcademgorodok 50/28Krasnoyarsk660036 Russia Siberian Federal University Svobodny str.79Krasnoyarsk660041 Russia Reshetnev Siberian State University of Science and Technology Krasnoyarsky rabochy str.31Krasnoyarsk660014 Russia Russian Center of Forest Protection Academgorodok 50A/2Krasnoyarsk660036 Russia

Siberian silkmoth(SSM,Dendrolimus sibiricus Tschetv.)is the most important defoliator of Siberian pine(Pinus sibirica Du Tour)and fir(Abies sibirica Ledeb.)***-induced SSM outbreaks are one of the major driving factors of successions within the taiga *** is suggested that climate change impacted the SSM range and life *** analyzed the migration of alpine and northerly SSM outbreak boundaries in Siberia and the impact of the climate variables and topography on the outbreak *** used time-series scenes(multispectral data,and vegetation indexes EVI and NDII)in combination with field studies,climate variables,and GIS *** found that SSM outbreaks in the area of alpine boundary shifted about 370 m uphill since the mid of *** outbreak onset was promoted by increased dryness and active temperatures and decreased root zone moisture content in the spring-early summer *** terrain topography strongly affected SSM outbreak onset and ***,the outbreak was located at the middle elevations on the gentle concave southeastern slopes,which are the favorable insect habitats between *** the outbreak expanded uphill and downhill,to steeper slopes,and both concave and convex *** with elevation range expansion,SSM surpassed its northern historical outbreak boundary:the potential outbreaks’boundary moved about 300 km *** warming contributes to SSM migration into former outbreak free conifer stands located in highlands and at northern latitudes.

关键词： Insect outbreaks Remote sensing monitoring Insect ranges expansion Siberian silkmoth Forest health Conifer mortality

Pre-processing for time domain image formation in SS-BSAR system

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Journal of Systems Engineering and Electronics 2012年第6期23卷 875-880页

作者： Michail Antoniou mikhail Cherniakov School of Electronic Electrical and Computer EngineeringUniversity of BirminghamBirmingham B15 2TTUK

A pre-processing procedure is designed for a space-surface bistatic synthetic aperture radar （SS-BSAR） system when a time domain image formation algorithm is employed. Three crucial technical issues relating to the procedure are fully discussed. Firstly, unlike image formation algorithms operating in the frequency domain, a time domain algorithm requires the accurate global navigation satellite system （GNSS） time and position. This paper proposes acquisition of this information using a time-and-spatial transfer with precise ephemeris and interpolation. Secondly, synchronization errors and compensation methods in SS-BSAR are analyzed. Finally, taking the non-ideal factors in the echo and the compatibility of image formation algorithms into account, a matched filter based on the minimum delay is constructed. Experimental result using real data suggest the pre-processing is functioning properly.

关键词： image formation space-surface bistatic syntheticaperture radar (SS-BSAR) global navigation satellite system(GNSS) synchronization range compression.

About Some Aspects of Use of Optical Sensors for Monitoring the Aquatic Environment

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Journal of Environmental & Earth Sciences 2024年第1期6卷 1-10页

作者： Ferdenant Mkrtchyan Vladimiir soldatov Maxim Mkrtchyan Kotelnikov Institute of Radioengineering&Electronics RAS Fryazino BranchVvedensky Sq.1FryazinoMoscow141190Russia

Multi-channel polarization optical technology is increasingly used for prompt monitoring of water *** devices during the assessment of water quality determine the intensity of light through the studied aquatic *** devices measure the spectrum of weakening of light through the aquatic *** devices receive spectra in vertical and horizontal *** presented article develops an adaptive optical hardware and image system for monitoring water *** system is *** consists of 2 parts:1)automated spectrophotometer-refractometer,and 2)adaptive *** system is equipped with a corresponding algorithmic and software,including algorithms for identifying spectral curves,databases and knowledge of spectral curves algorithms for solving reverse *** presented system is original since it differs from modern foreign systems by a new method of spectrophotometric and spectroellipsometric measurements,an original elemental base of polarization optics and a comprehensive mathematical approach to assessing the quality of a water *** are no rotating polarization elements in the ***,this makes it possible to increase the signal-to-noise ratio and,as a result,improve measurement stability and simplify multichannel spectrophotometers and *** proposed system can be used in various water systems where it is necessary to assess water quality or identify the presence of a certain set of chemical elements.

关键词： Monitoring Aquatic environment Polarization optics Water object Pollutants Spectral images Classification Identification