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Journal of Thermal Science 2013年第2期22卷 174-179页

作者： Sergey P. Mochalov Sergey n. Kalashnikov pavel S. Mochalov Guolin Song Guoyi Tang Siberian State Industrial University Advanced Materials Institute Graduate School at ShenzhenTsinghua University

The automated energy generating complex allows obtaining heat energy from waste coal-water slurry fuel （WCF） that is a mixture of fine coal particles from coal enrichment wastes with water. The mixture is blown into the swirl chamber under the pressure through the special sprayers. The received heat energy is used in different ways. One of the important issues is to estimate the heat losses through the walls of this chamber. In this paper we solved the boundary problem of mathematical physics to estimate the temperature fields in the walls of the swirl chamber. The obtained solution allows us to estimate the heat losses through the waUs of the swid chamber. The task of the mathematical physics has been solved by a numerical finite-difference method. The method for solving this prob- lem can be used in the calculation of temperature fields and evaluation of heat losses in other thermal power units.

关键词： heat transfer heat conduction equation boundary conditions the heat transfer coefficient tempera-ture distribution.

Comparing the removal of polycyclic aromatic hydrocarbons in soil after different bioremediation approaches in relation to the extracellular enzyme activities

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Journal of Environmental Sciences 2019年第2期31卷 249-258页

作者： Zdeněk Ko?ná? Tereza ?ástková Lucie Wiesnerová Luká? Praus Ivan Jablonsky Martin Koudela pavel Tlusto? Department of Agroenvironmental Chemistry and Plant nutrition Faculty of AgrobiologyFood and Natural ResourcesCzech University of Life Sciences Prague Department of Horticulture Faculty of AgrobiologyFood and Natural ResourcesCzech University of Life Sciences Prague

A 120-day experiment was conducted to compare the removal of polycyclic aromatic hydrocarbons(PAHs) from agricultural soil after natural attenuation(nA), phytoremediation(P), mycoremediation(M), and plant-assisted mycoremediation(PAM) approaches in relation to the extracellular enzyme activities in soil. The nA treatment removed the total soil PAH content negligibly. The P treatment using maize(Zea mays) enhanced only the removal of low and medium molecular PAHs. The Pleurotus ostreatus cultivated on 30–50 mm wood chip substrate used in M treatment was the most successful in the removal of majority PAHs. Therefore,significantly(p nts was observed. When using the same fungal substrate together with maize in PAM treatment, the total PAH removal was not statistically different from the previous M treatment. However, the maize-assisted mycoremediation treatment significantly boosted fungal biomass, microbial and manganese peroxidase activity in soil which strongly correlated with the removal of total PAHs. The higher PAH removal in that PAM treatment could be reflected in the following post-harvest time. Our suggested M and PAM approaches could be promising in situ bioremediation strategies for PAH-contaminated soils.

关键词： PAHs Biodegradation White-rot fungi Ligninolytic enzymes Microbial activity

Influence of environmental predispositions on temperate mountain forest damage at different spatial scales during alternating drought and flood periods:case study in Hruby Jeseník Mts.(Czech Republic)

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Journal of Mountain Science 2022年第7期19卷 1931-1944页

作者： pavel SAMEC Romana KUDELKOVA Petr LUKES Ales KUCERA pavel CUDLIn Global Change Research Institute CAS Bělidla 986/4aBrnoCZ-60300Czech Republic Department of Geology and Soil Science Faculty of Forestry and Wood TechnologyMendel University in BrnoZemědělská3BRNOCZ-61300Czech Republic Department of Geoinformatics Faculty of SciencePalacky University Olomouc17.listopadu 50OlomoucCZ-77900Czech Republic

Mountain forests are more prone to environmental predispositions(EPs)than submountain *** remote sensing of mountain forests enables instantaneous damage mapping,the investigation of the causes requires field ***,a local field or regionally modeled environmental characteristics influence remote data evaluation *** study focused on the evaluation of EPs effects damaging mountain forests between various spatial resolutions during environmental *** evaluation was divided into managed and natural forests in the Hruby Jeseník Mts.(Czech Republic;240-1491 m a.s.l.;50.082°n,17.231°E).Damage was assessed through the discrimination analysis of the normalised difference vegetation index(nDVI)by MODIS VI during alternating drought and flood periods *** local environmental influence was assessed using the discrimination function(DF)separability of forest damage in the training *** regional influence was assessed through map algebra estimated via the DF and a forest decline spatial model based on EPs from differences between risk growth conditions and biomass fuzzy ***,EPs and soil influenced forest nDVI at different *** management afflicted the nDVI more than the *** EPs afflicted the nDVI more than the soil *** winters and droughts had a greater influence on the nDVI than the flood events,with the winter of 2005/2006 inverting the DF direction,and the 2003 drought increasing differences in managed forest biomass and decreasing differences in natural forest *** than 50% of declining managed forests in the training sets occurred on Leptosols,Podzols and *** a regional scale,the soil influence was eliminated by multiple *** EPs influenced 96% of natural forest and 65% of managed forest,though managed forest damage was more *** mountain forest nDVI decline was dependent on both management and risk predispositions.

关键词： Mountain environment Forest damage types Canopy density Soil group norway spruce(Picea abies)

Advanced machine learning decision policies for diameter control of carbon nanotubes

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npj Computational Materials 2021年第1期7卷 1454-1462页

作者： Rahul Rao Jennifer Carpena-núñez pavel nikolaev Michael A.Susner Kristofer G.Reyes Benji Maruyama Materials and Manufacturing Directorate Air Force Research LaboratoryWPAFBDaytonOH 45433USA UES Inc.DaytonOH 45423USA Department of Materials Design and Innovation University at BuffaloBuffaloNY 14260USA

The diameters of single-walled carbon nanotubes(SWCnTs)are directly related to their electronic properties,making diameter control highly desirable for a number of *** we utilized a machine learning planner based on the Expected Improvement decision policy that mapped regions where growth was feasible *** feasible and further optimized synthesis conditions to selectively grow SWCnTs within a narrow diameter *** maximized two ranges corresponding to Raman radial breathing mode frequencies around 265 and 225 cm^(−1)(SWCnT diameters around 0.92 and 1.06 nm,respectively),and our planner found optimal synthesis conditions within a hundred *** post-growth characterization showed high selectivity in the optimized growth experiments compared to the unoptimized growth ***,our planner revealed significantly different synthesis conditions for maximizing the two diameter ranges in spite of their relative *** study shows the promise for machine learning-driven diameter optimization and paves the way towards chirality-controlled SWCnT growth.

关键词： synthesis carbon diameters

Archery Algorithm:A novel Stochastic Optimization Algorithm for Solving Optimization Problems

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Computers, Materials & Continua 2022年第7期72卷 399-416页

作者： Fatemeh Ahmadi Zeidabadi Mohammad Dehghani pavel Trojovsky Štěpán Hubálovsky Victor Leiva Gaurav Dhiman Department of Mathematics and Computer Sciences Sirjan University of TechnologySirjanIran Department of Mathematics Faculty of ScienceUniversity of Hradec Králové50003Hradec KrálovéCzech Republic Department of Applied Cybernetics Faculty of ScienceUniversity of Hradec Králové50003Hradec KrálovéCzech Republic School of Industrial Engineering Pontificia Universidad Católica de ValparaísoValparaíso2362807Chile Department of Computer Science Government Bikram College of CommercePatialaPunjabIndia

Finding a suitable solution to an optimization problem designed in science is a major ***,these must be addressed utilizing proper *** on a random search space,optimization algorithms can find acceptable solutions to *** Algorithm(AA)is a new stochastic approach for addressing optimization problems that is discussed in this *** fundamental idea of developing the suggested AA is to imitate the archer’s shooting behavior toward the target *** proposed algorithm updates the location of each member of the population in each dimension of the search space by a member randomly marked by the *** AA is mathematically described,and its capacity to solve optimization problems is evaluated on twenty-three distinct types of objective ***,the proposed algorithm’s performance is compared *** approaches,including teaching-learning based optimization,marine predators algorithm,genetic algorithm,grey wolf optimization,particle swarm optimization,whale optimization algorithm,gravitational search algorithm,and tunicate swarm *** to the simulation findings,the AA has a good capacity to tackle optimization issues in both unimodal and multimodal scenarios,and it can give adequate quasi-optimal solutions to these *** analysis and comparison of competing algorithms’performance with the proposed algorithm demonstrates the superiority and competitiveness of the AA.

关键词： Archer meta-heuristic algorithm population-based optimization stochastic programming swarm intelligence population-based algorithm Wilcoxon statistical test

SSABA:Search Step Adjustment Based Algorithm

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Computers, Materials & Continua 2022年第6期71卷 4237-4256页

作者： Fatemeh Ahmadi Zeidabadi Ali Dehghani Mohammad Dehghani Zeinab Montazeri Stepán Hubálovsky pavel Trojovsky Gaurav Dhiman Department of Mathematics and Computer Sciences Sirjan University of TechnologySirjanIran Department of Civil Engineering Islamic Azad UniversityEstahban BranchEstahbanIran Department of Mathematics Faculty of ScienceUniversity of Hradec KrálovéHradec Králové50003Czech Republic Department of Electrical and Electronics Engineering Shiraz University of TechnologyShirazIran Department of Applied Cybernetics Faculty of ScienceUniversity of Hradec KrálovéHradec Králové50003Czech Republic Department of Computer Science Government Bikram College of CommercePatialaPunjabIndia

Finding the suitable solution to optimization problems is a fundamental challenge in various *** algorithms are one of the effective stochastic methods in solving optimization *** this paper,a new stochastic optimization algorithm called Search StepAdjustment Based Algorithm(SSABA)is presented to provide quasi-optimal solutions to various optimization *** the initial iterations of the algorithm,the step index is set to the highest value for a comprehensive search of the search ***,with increasing repetitions in order to focus the search of the algorithm in achieving the optimal solution closer to the global optimal,the step index is reduced to reach the minimum value at the end of the algorithm *** is mathematically modeled and its performance in optimization is evaluated on twenty-three different standard objective functions of unimodal and multimodal *** results of optimization of unimodal functions show that the proposed algorithm SSABA has high exploitation power and the results of optimization of multimodal functions show the appropriate exploration power of the proposed *** addition,the performance of the proposed SSABA is compared with the performance of eight well-known algorithms,including Particle Swarm Optimization(PSO),Genetic Algorithm(GA),Teaching-Learning Based Optimization(TLBO),Gravitational Search Algorithm(GSA),Grey Wolf Optimization(GWO),Whale Optimization Algorithm(WOA),Marine Predators Algorithm(MPA),and Tunicate Swarm Algorithm(TSA).The simulation results show that the proposed SSABA is better and more competitive than the eight compared algorithms with better performance.

关键词： Optimization population-based optimization problem search step optimization algorithm minimization maximization

Toward room-temperature nanoscale skyrmions in ultrathin films

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npj Computational Materials 2020年第1期6卷 58-68页

作者： Anastasiia SVarentcova Stephan von Malottki Maria n.Potkina Grzegorz Kwiatkowski Stefan Heinze pavel F.Bessarab ITMO University St.Petersburg 197101Russia Science Institute University of IcelandReykjavík 107Iceland Kavli Institute of nanoscience Delft University of TechnologyP.O.Box 4056Delft 2600 GAThe Netherlands Institute of Theoretical Physics and Astrophysics University of KielLeibnizstrasse 15Kiel 24098Germany St.Petersburg State University St.Petersburg 198504Russia Peter Grünberg Institute and Institute for Advanced Simulation Forschungszentrum JülichJülich 52425Germany

Breaking the dilemma between small size and room-temperature stability is a necessary prerequisite for skyrmion-based information *** we demonstrate by means of rate theory and an atomistic spin Hamiltonian that the stability of isolated skyrmions in ultrathin ferromagnetic films can be enhanced by the concerted variation of magnetic interactions while keeping the skyrmion size *** predict film systems where the lifetime of sub-10 nm skyrmions can reach years at ambient conditions.

关键词： conditions stability films

Photo-stability and Photo-damage of SPASER nanoparticles under nanosecond Pulsed-laser

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Chinese Journal of Chemistry 2022年第4期40卷 507-514页

作者： Jian-Hua Wang Shao-Peng Wang pavel n.Melentiev Bin Kang Jing-Juan Xu Hong-Yuan Chen State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences School of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu 210023China Institute of Spectroscopy of the Russian Academy of Sciences TroitskMoscow 108840Russia

Comprehensive Summary SPASER nanoparticle(nP),with small size,ultranarrow spectral-line and good biocompatibility,is a potential biomedical ***,owning to the striking light absorption capacity of Au-resonator,huge energy could accumulate under strong pumping-laser,which would lead to poor photo-stability and unexpected photo-damage to SPASER nP,and is harmful to its future practical application but hasn't been systematically studied in experiment.

关键词： SPASER nanoparticles Probe Laser spectroscopy Photophysics

Asymptotics for the Korteweg-de Vries-Burgers Equation

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Acta Mathematica Sinica,English Series 2006年第5期22卷 1441-1456页

作者： nakao HAYASHI pavel I.nAUMKIn Department of Mathematics Graduate School of ScienceOsaka UniversityOsakaToyonaka560-0043Japan Instituto de Matemáticas UNAM Campus MoreliaAP 61-3(Xangari)Morelia CP 58089MichoacánMexico

We study large time asymptotics of solutions to the Korteweg-de Vries-Burgers equation ut＋uux-uxx＋uxxx=0,x∈R,t〉0. We are interested in the large time asymptotics for the case when the initial data have an arbitrary size. We prove that if the initial data u0 ∈H^s （R）∩L^1 （R）, where s 〉 -1/2, then there exists a unique solution u （t, x） ∈C^∞ （（0,∞）;H^∞ （R）） to the Cauchy problem for the Korteweg-de Vries-Burgers equation, which has asymptotics u（t）=t^-1/2fM（（·）t^-1/2）＋0（t^-1/2） as t →∞, where fM is the self-similar solution for the Burgers equation. Moreover if xu0 （x） ∈ L^1 （R）, then the asymptotics are true u（t）=t^-1/2fM（（·）t^-1/2）＋O（t^-1/2-γ） where γ ∈ （0, 1/2）.

关键词： Korteweg-de Vries-Burgers equation asymptotics for large time large initial data

Molecular docking of cyanine and squarylium dyes with SARS-CoV-2 proteases nSP3, nSP5 and nSP12

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Quantitative Biology 2021年第4期9卷 440-450页

作者： pavel Pronkin Alexander Tatikolov n.m.emanuel institute of biochemical physics russian academy of sciencesmoscow 119991russia

Background:The outbreak and continued spread of coronavirus infection(COVID-19)sets the goal of finding new tools and methods to develop analytical procedures and tests to detect,study infection and prevent ***:The noncovalent binding of cyanine and squarylium dyes of different classes(60 compounds in total)with the proteases nSP3,nSP5,and nSP12 of SARS-CoV-2 was studied by the method of molecular ***:The interaction energies and spatial configurations of dye molecules in complexes with nSP3,nSP5,and nSP12 have been ***:A number of anionic dyes showing lower values of the total energy Etot could be recommended for practical research in the development of agents for the detection and inactivation of the coronavirus.

关键词： SARS-CoV-2 proteases polymethine dyes squarylium dyes noncovalent interaction molecular docking