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On the stability of small-scale ballooning modes in axisymmetric mirror traps

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Plasma Science and Technology 2022年第1期24卷 8-17页

作者： igor KOTELNIKOV Andrej LIZUNOV Qiusun ZENG Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090Russia Novosibirsk State University Novosibirsk 630090Russia Institute of Nuclear Energy Safety Technology HFIPS CAS Hefei 230031People's Republic of China

It is shown that a steepening of the radial plasma pressure profile leads to a decrease in the critical value of beta,above which,small-scale balloon-type perturbations in a mirror trap become *** may mean that small-scale ballooning instability leads to a smoothing of the radial plasma *** critical beta values for the real magnetic field of the gas-dynamic trap and various plasma pressure radial profiles was also *** a plasma with a parabolic profile critical beta is evaluated at the level of 0.72.A previous theoretical prediction for this trap was almost two times lower than maximal beta 0.6 achieved experimentally.

关键词： mirror trap ballooning modes critical beta

Single‑Photon Sources Based on Novel Color Centers in Silicon Carbide P–I–N Diodes: Combining Theory and Experiment

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Nano-Micro Letters 2021年第5期13卷 192-203页

作者： igor A.Khramtsov Dmitry Yu.Fedyanin Laboratory of Nanooptics and Plasmonics Center for Photonics and 2D MaterialsMoscow Institute of Physics and Technology141700DolgoprudnyRussian Federation

Point defects in the crystal lattice of SiC,known as color centers,have recently emerged as one of the most promising single-photon emitters for non-classical light ***,the search for the best color center that satisfies all the requirements of practical applications has only just *** color centers in SiC have been recently discovered but not yet ***,it is extremely challenging to understand their optoelectronic properties and evaluate their potential for use in practical single-photon ***,we present a theoretical approach that explains the experiments on single-photon electroluminescence(SPEL)of novel color centers in SiC p-i-n diodes and gives the possibility to engineer highly efficient single-photon emitting diodes based on ***,we develop a novel method of determining the electron and hole capture cross sections by the color center from experimental measurements of the SPEL rate and second-order *** other methods,the developed approach uses the experimental results at the single defect level that can be easily obtained as soon as a single-color center is identified in the i-type region of the SiC p-i-n diode.

关键词： Color centers Electron capture cross section Single-photon emitting diodes Single-photon electroluminescence Charge state control

Encouraging active learning when teaching geospatial sciences

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Geo-Spatial Information Science 2014年第4期17卷 219-228页

作者： igor A.MUSIKHIN Siberian State Academy of Geodesy Plakhotnogo Str.Novosibirsk 630108Russia

In today’s world,higher education,especially in technical sciences,is crucial when speaking about a change in values and attitudes towards *** students in learning and training process as well as developing their research skills and creative capacity is *** study inquiries into the current academic activities and role of used educational technologies and methodologies for encouraging active learning in both undergraduate and postgraduate programs when teaching any engineering course in general,and geospatial sciences in *** result of the study suggests the importance of interdisciplinary project and problem-based learning,building partnership with universities,students and industrial companies,monitoring,developing,and implementation of new educational technologies.

关键词： active learning geospatial sciences learning-style preferences good practice in higher education creativity

Optical metasurfaces: new generation building blocks for multi-functional optics

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Light(Science & Applications) 2018年第1期7卷 495-499页

作者： Dragomir Neshev igor Aharonovich Nonlinear Physics Centre Research School of Physics and EngineeringAustralian National UniversityCanberraACT 2601Australia Institute of Biomedical Materials and Devices University of Technology SydneyUltimoNSW 2007Australia

Optical metasurfaces(OMs)have emerged as promising candidates to solve the bottleneck of bulky optical *** offer a fundamentally new method of light manipulation based on scattering from resonant nanostructures rather than conventional refraction and propagation,thus offering efficient phase,polarization,and emission *** perspective highlights state of the art OMs and provides a roadmap for future applications,including active generation,manipulation and detection of light for quantum technologies,holography and sensing.

关键词： surfaces optics resonant

Artificial intelligence-based predictive model of nanoscale friction using experimental data

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Friction 2021年第6期9卷 1726-1748页

作者： Marko PERČIĆ Saša ZELENIKA igor MEZIĆ University of Rijeka Faculty of Engineering51000 RijekaCroatia University of Rijeka Centre for Micro-and Nanosciences and Technologies&Center for Artificial Intelligence and Cybersecurity51000 RijekaCroatia University of California Santa Barbara Department of Mechanical EngineeringSanta BarbaraCA 93105USA

A recent systematic experimental characterisation of technological thin films,based on elaborated design of experiments as well as probe calibration and correction procedures,allowed for the first time the determination of nanoscale friction under the concurrent influence of several process parameters,comprising normal forces,sliding velocities,and temperature,thus providing an indication of the intricate correlations induced by their interactions and mutual *** created the preconditions to undertake in this work an effort to model friction in the nanometric domain with the goal of overcoming the limitations of currently available models in ascertaining the effects of the physicochemical processes and phenomena involved in nanoscale *** to the stochastic nature of nanoscale friction and the relatively sparse available experimental data,meta-modelling tools fail,however,at predicting the factual *** on the acquired experimental data,data mining,incorporating various state-of-the-art machine learning(ML)numerical regression algorithms,is therefore *** results of the numerical analyses are assessed on an unseen test dataset via a comparative statistical *** is therefore shown that the black box ML methods provide effective predictions of the studied correlations with rather good accuracy levels,but the intrinsic nature of such algorithms prevents their usage in most practical *** programming-based artificial intelligence(AI)methods are consequently finally *** the marked complexity of the analysed phenomena and the inherent dispersion of the measurements,the developed AI-based symbolic regression models allow attaining an excellent predictive performance with the respective prediction accuracy,depending on the sample type,between 72%and 91%,allowing also to attain an extremely simple functional description of the multidimensional dependence of nanoscale friction on the studied variable process param

关键词： nanoscale friction thin films data mining machine learning(ML) predictive artificial intelligence(AI)-based model

Magnesium acethyltaurate as a potential agent for retinal and optic nerve protection in glaucoma

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Neural Regeneration Research 2018年第5期13卷 807-808页

作者： igor Iezhitsa Renu Agarwal Centre for Neuroscience Research Faculty of Medicine Universiti Teknologi MARA Volgograd State Medical University Research Institute of Pharmacology

Glaucoma is the second leading cause of irreversible vision impairment affecting more than 70 million people worldwide with approximately 10%suffering from glaucoma-related bilateral blind（Quigley and Broman,2006）.It is a multi-factorial disease that is characterized by optic nerve damage and visual field *** loss of retinal ganglion cells（RGCs）resulting in visual field deficits is the hallmark of glaucoma.

关键词： Magnesium acethyltaurate as a potential agent for retinal and optic nerve protection in glaucoma

Microheterogeneity of the Koupol Deposit Fahlores as a Reflection of Changing of Physicochemical Parameters of the Ore-Forming Solution

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Journal of Earth Science 2013年第2期24卷 179-187页

作者： igor'V Kemkin Raisa A Kemkina Far East Geological Institute Far Eastern Branch of the Russian Academy of Sciences Far East Federal University

New data on a zonal structure of the Koupol deposit fahlores grains are given, and features of their chemism are shown. The fahlores chemical composition within the zones evolves from essentially arsenious （Fe-tennantite and Zn-tennantite）, through mixed fahlores （Zn-tennantitetetrahedrite arsenious and Zn-tennantite-tetrahedrite antimonous）, to essential antimonous （Ag-bearing Zn-tetrahedrite）. Varying chemical composition manifested as mineralogical-geochemical zonation of the fahlores grains is caused by changes of physicochemical conditions of the ore forming process during the time.

关键词： fahlore mineralogical-geochemical zonation physicochemical condition Koupol deposit.

Improvement of the software for modeling the dynamics of epidemics and developing a user-friendly interface

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Infectious Disease Modelling 2023年第3期8卷 806-821页

作者： igor Nesteruk Institute of Hydromechanics National Academy of Sciences of UkraineKyivUkraine igor Sikorsky Kyiv Polytechnic Institute KyivUkraine

The challenges humanity is facing due to the Covid-19 pandemic require timely and accurate forecasting of the dynamics of various epidemics to minimize the negative consequences for public health and the *** can use a variety of well-known and new mathematical models,taking into account a huge number of ***,complex models contain a large number of unknown parameters,the values of which must be determined using a limited number of observations,e.g.,the daily datasets for the accumulated number of *** experience in modeling the COVID-19 pandemic has shown that it is possible to apply the simplest SIR model,which contains 4 unknown *** of the original algo-rithm of the model parameter identification for the first waves of the COVID-19 pandemic in China,South Korea,Austria,Italy,Germany,France,Spain has shown its high accuracy in pre-dicting their duration and number of *** simulate different epidemic waves and take into account the incompleteness of statistical data,the generalized SIR model and algorithms for determining the values of its parameters were *** interference of the previous waves,changes in testing levels,quarantine or social behavior require constant monitoring of the epidemic dynamics and performing SIR simulations as often as possible with the use of a user-friendly *** tool will allow predicting the dynamics of any epidemic using the data on the number of diseases over a limited period(e.g.,14 days).It will be possible to predict the daily number of new cases for the country as a whole or for its separate region,to estimate the number of carriers of the infection and the probability of facing such a carrier,as well as to estimate the number of *** of three SIR simulations of the COVID-19 epidemic wave in Japan in the summer of 2022 are presented and *** predicted accumulated and daily numbers of cases agree with the results of observations,especially f

关键词： COVID-19 pandemic Epidemic waves Epidemic dynamics in Japan Mathematical modeling of infection diseases SIR model Parameter identification Statistical methods

pepgrep:A Tool for Peptide MS/MS Pattern Matching

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Genomics, Proteomics & Bioinformatics 2013年第2期11卷 127-132页

作者： igor Chernukhin School of Biological Sciences University of Essex

Typically, detection of protein sequences in collision-induced dissociation （CID） tandem MS （MS2） dataset is performed by mapping identified peptide ions back to protein sequence by using the protein database search （PDS） engine. Finding a particular peptide sequence of interest in CID MS2 records very often requires manual evaluation of the spectrum, regardless of whether the peptide-associated MS2 scan is identified by PDS algorithm or not. We have developed a com- pact cross-platform database-free command-line utility, pepgrep, which helps to find an MS2 finger- print for a selected peptide sequence by pattern-matching of modelled MS2 data using Peptide-to- MS2 scoring algorithm, pepgrep can incorporate dozens of mass offsets corresponding to a variety of post-translational modifications （PTMs） into the algorithm. Decoy peptide sequences are used with the tested peptide sequence to reduce false-positive results. The engine is capable of screening an MS2 data file at a high rate when using a cluster computing environment. The matched MS2 spectrum can be displayed by using built-in graphical application programming interface （API） or optionally recorded to file. Using this algorithm, we were able to find extra peptide sequences in studied CID spectra that were missed by PDS identification. Also we found pepgrep especially useful for examining a CID of small fractions of peptides resulting from, for example, affinity puri- fication techniques. The peptide sequences in such samples are less likely to be positively identified by using routine protein-centric algorithm implemented in PDS. The software is freely available at http：//***：8080/data/download/pepgrep- ***.

关键词： Collision-induced dissociation Tandem MSTandem MS Protein database search Peptide identification