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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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Phase Transformations in ZrO_2 after Shock Loading

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Journal of Materials Science & Technology 1993年第1期9卷 32-36页

作者： Sergey N.Kulkov alexander G.melnikov Institute of Strength Physics and Materials Science.

The effects of shock loading on the morphology,grain growth during heating and phase transforma- tion of ZrO_2 have been *** is shown that shock loading may be efficiently used to modify submicron ceramic powders with nanocrystalline *** shock loading,the critical diameter of ZrO_2 particles transformed from tetragonal to monoclinic decreased due to stored strain energy. Annealing of powders resulted in reversible transformation to the tetragonal without considerable grain growth up to 1200℃.

关键词： submicron ceramics nanocrystalline shock loading phase transformation

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On the Metaheuristics Approach to the Problem of Genetic Sequence Comparison and Its Parallel Implementation

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Applied Mathematics 2013年第10期4卷 35-39页

作者： Sergey Makarkin Boris melnikov alexander Panin Department of Mathematics and Information Science Togliatti State University Togliatti Russia Togliatti Branch of Samara State University Togliatti Russia Yandex Company Moscow Russia

We describe parallel implementation of the metaheuristic approach to the problem of comparing strings representing DNA sequence. By this approach, one can define a whole new class of metrics on a set of strings;some of this metrics can lead to interesting results when used for string comparison. We propose several heuristics;compare results achieved when using those heuristics and compare parallel and sequential implementation of proposed approach.

关键词： Metaheuristic Approach Genetic Sequence Analysis Levenshtein Distance Strings Alignment Parallel Programming

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Disease modifying treatment of spinal cord injury with directly reprogrammed neural precursor cells in non-human primates

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World Journal of Stem Cells 2021年第5期13卷 452-469页

作者： Vladimir P Baklaushev Oleg V Durov Vladimir A Kalsin Eugene V Gulaev Sergey V Kim Ilya L Gubskiy Veronika A Revkova Ekaterina M Samoilova Pavel A melnikov Dzhina D Karal-Ogly Sergey V Orlov alexander V Troitskiy Vladimir P Chekhonin alexander V Averyanov Jan-Eric Ahlfors Biomedical Research Federal Research and Clinical Center of Specialized Medical Care and Medical TechnologiesFMBA of RussiaMoscow 115682MoskvaRussia Department of Neurosurgery Federal Research and Clinical Center of Specialized Medical Care and Medical TechnologiesFMBAMoscow 115682MoskvaRussia Department of Anesthesiology N.N.Blokhin Russian Cancer Research CentreMoscow 115478MoskvaRussia Radiology and Clinical Physiology Scientific Research Center Federal center of brain research and neurotechnologies of the Federal Medical Biological AgencyMoscow 117997Russia Department of Neurobiology Serbsky National Medical Research Center for Psychiatry and NarcologyMoscow 119992MoskvaRussia Department of Primatology Russian Acad Med SciResearch Institute of Medical PrimatologySochi 119992SochiRussia Department of Vascular Surgery Federal Research and Clinical Center of Specialized Medical Care and Medical TechnologiesFMBA of RussiaMoscow 115682MoskvaRussia Department of Basic and Applied Neurobiology V.P.Serbsky Federal Medical Research Center for Psychiatry and NarcologyRussia Department of Medical Nanobiotechnology Pirogov Russian National Research Medical University(RNRMU)Moscow 115682MoskvaRussia New World Laboratories Laval H7V 4A7QuebecCanada

BACKGROUND The development of regenerative therapy for human spinal cord injury(SCI)is dramatically restricted by two main challenges:the need for a safe source of functionally active and reproducible neural stem cells and the need of adequate animal models for preclinical *** reprogramming of somatic cells into neuronal and glial precursors might be a promising solution to the first *** use of non-human primates for preclinical studies exploring new treatment paradigms in SCI results in data with more translational relevance to human *** To investigate the safety and efficacy of intraspinal transplantation of directly reprogrammed neural precursor cells(drNPCs).METHODS Seven non-human primates with verified complete thoracic SCI were divided into two groups:drNPC group(n=4)was subjected to intraspinal transplantation of 5 million drNPCs rostral and caudal to the lesion site 2 wk post injury,and lesion control(n=3)was injected identically with the equivalent volume of *** Follow-up for 12 wk revealed that animals in the drNPC group demonstrated a significant recovery of the paralyzed hindlimb as well as recovery of somatosensory evoked potential and motor evoked potential of injured *** resonance diffusion tensor imaging data confirmed the intraspinal transplantation of drNPCs did not adversely affect the morphology of the central nervous system or cerebrospinal fluid *** immunohistochemical analysis showed that drNPCs maintained SOX2 expression characteristic of multipotency in the transplanted spinal cord for at least 12 wk,migrating to areas of axon growth *** Our data demonstrated that drNPC transplantation was safe and contributed to improvement of spinal cord function after acute SCI,based on neurological status assessment and neurophysiological recovery within 12 wk after *** functional improvement described was not associated with neuronal differentiation of th

关键词： Direct cell reprogramming Neural precursor cells Directly reprogrammed neural precursor cells Spinal cord injury Nonhuman primates Regenerative therapy,Evoked potentials

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A route to understanding the variability in permafrost distribution under climate change

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Advances in Climate Change Research 2023年第2期14卷 164-165页

作者： alexander N.FEDOROV melnikov Permafrost Institute Yakutsk 677010Russian Federation

Researchers are concerned about the present state of permafrost,which occupies about 25%of the Earth's *** degradation disturbs the landscape and increases greenhouse gas emissions,creating serious problems for human settlements,infrastructure,new land creation and mineral resource *** in previously stable permafrost systems impact surface hydrology,transform ecosystems,and change the way people live in permafrost。

关键词： landscape greenhouse Earth

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Eastern Siberia permafrost transect(ESPT).A first stage:The Verkhoyansk Range part

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Journal of Mountain Science 2023年第6期20卷 1499-1507页

作者： Robert SYSOLYATIN Svetlana KALINICHEVA alexander FEDOROV Maria ROZHINA melnikov Permafrost Institute Yakutsk 677010Russia

Environmental and geomorphological processes in the mountainous areas of Eastern Siberia is strongly conditioned by the thermal state of permafrost(permanently frozen ground).However,the scarce data about climate and weak of permafrost study have led to the unclarity of mountain permafrost condition in this *** increase in the mean annual air temperature over the past 50 years in the northeastern Siberia by various estimates is from 1.1℃to 3.3℃.So far,almost no information is available on the permafrost response to climatic changes in the *** Kolyma Route(around 2000 km length),connecting Yakutsk and Magadan that crosses 5 climatic types and more than 10 permafrost landscapes,so it seems a suitable path for establishing basic(reference)monitoring *** 12 target boreholes,on the first stage 5 boreholes up to 30 m in depth were drilled and instrumented for measuring temperature at sites adjacent to weather stations in the Verkhoyansk Range from 283 to 1288 m *** we present conception,purpose,and methods for permafrost study project with first preliminary results from the highest weather station of the East Siberia *** following research about geophysical investigations,permafrost landscape description,mapping and spatial modelling,numerical computing,physical modelling of permafrost thickness might be initiated by the Eastern Siberia Permafrost Transect(ESPT)-project.

关键词： Ground temperature Mountain permafrost Temperature e monitoring Verkhoyansk Range Climate change.

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Characteristics of the active-layer under the China-Russia Crude Oil pipeline

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Journal of Mountain Science 2021年第2期18卷 323-337页

作者： SERBAN Mihaela LI Guo-yu SERBAN Raul-David WANG Fei FEDOROV alexander VERA Samsonova CAO Ya-peng CHEN Peng-chao WANG Wei State Key Laboratory of Frozen Soils Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Da Xing’anling Observation and Research Station of Frozen-Ground Engineering and Environment Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesJiagedaqi 165000China University of Chinese Academy of Sciences Beijing 100049China melnikov Permafrost Institute SB RASYakutsk 677010Russia PetroChina Pipeline Company Langfang 065000China Jiagedaqi Oil and Gas Transmission Sub-company PetroChina Pipeline CompanyJiagedaqi 165000China

Active layer is a key component for permafrost environment studies as many subsurface biological,biogeochemical,ecological,and pedogenic activities prevail in this *** study focuses on active layer temperature monitoring in an area with sporadic permafrost at two adjacent sites along China-Russia Crude Oil Pipeline(CRCOP),NorthEast *** T1 is located in disturbed ground on the right-of-way(on-ROW)2 m away from the center of the oil pipeline.T2 is located in a natural and undisturbed site,around 16.6 m *** objective was to study seasonal variability of the active layer depth and thermal regime from October 2017 to September *** monitoring sites consist of soil temperature probes arranged in a vertical array at different depths at both *** following parameters were computed:number of isothermal days(ID),freezing days(FD),thawing days(TD),freezing degree days(FDD),thawing degree days(TDD),number of freeze-thaw days(FTD).The mean air temperature in the monitoring period reached-3.2℃.The temperature profile indicates that the maximum active layer thickness observed during the study period was 10 m at T1 and 2 m at *** majority of the soil temperatures were above or close to 0℃,resulting in great values of TDD,especially in the first 4 m *** for T1 were predominant and ranged between 600-1160℃·days(0-4 m depth)reflecting the influence of oil temperature from the *** T2 borehole FDD were predominant for all the soil layer depths resulting in less permafrost *** comparison emphasizes the significant influence of vegetation removal and the dispersed heat from the pipeline on the active layer thickness.

关键词： Soil thermal regime Permafrost China Russia Crude Oil Pipeline Active layer

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