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Issues

Volume 2333, Issue 1
8 March 2021
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PRELIMINARY

Preface: Applications of Mathematics in Engineering and Economics (AMEE’20)
AIP Conf. Proc. 2333, 010001 (2021) https://doi.org/10.1063/12.0003257
View articletitled, Preface: Applications of Mathematics in Engineering and Economics (AMEE’20)
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BIOMEDICAL INFORMATICS

Medical image processing based on multidimensional wavelet transforms - Advantages and trends
Veska Georgieva; Plamen Petrov; Dora Zlatareva
AIP Conf. Proc. 2333, 020001 (2021) https://doi.org/10.1063/5.0041869
View articletitled, Medical image processing based on multidimensional wavelet transforms - Advantages and trends
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DATA SCIENCE

Artificial intelligence in real estate market analysis
Stanimir Kabaivanov; Veneta Markovska
AIP Conf. Proc. 2333, 030001 (2021) https://doi.org/10.1063/5.0041806
View articletitled, Artificial intelligence in real estate market analysis
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Machine learning assisted social system analysis: Youth transitions in five south and east Mediterranean countries
Stanimir Kabaivanov; Ken Roberts; Siyka Kovacheva
AIP Conf. Proc. 2333, 030002 (2021) https://doi.org/10.1063/5.0041807
View articletitled, Machine learning assisted social system analysis: Youth transitions in five south and east Mediterranean countries
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Comparative analysis on CNN and wavelet features based technology for medical image classification
Stella Vetova
AIP Conf. Proc. 2333, 030003 (2021) https://doi.org/10.1063/5.0043624
View articletitled, Comparative analysis on CNN and wavelet features based technology for medical image classification
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In silico knowledge data discovery in the context of IoT ecosystem security issues
Plamenka Borovska; Desislava Ivanova
AIP Conf. Proc. 2333, 030004 (2021) https://doi.org/10.1063/5.0043737
View articletitled, In silico knowledge data discovery in the context of IoT ecosystem security issues
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Quality of solution of massively parallel MSA based on metaheuristic social behavioral model
Plamenka Borovska; Maria Marinova
AIP Conf. Proc. 2333, 030005 (2021) https://doi.org/10.1063/5.0043739
View articletitled, Quality of solution of massively parallel MSA based on metaheuristic social behavioral model
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Design and implementation of differentiated analytics workflow for imaging diagnostics on the intelligent integrated digital platform InSilicoKDD
Iliyan Kordev; Plamenka Borovska
AIP Conf. Proc. 2333, 030006 (2021) https://doi.org/10.1063/5.0043740
View articletitled, Design and implementation of differentiated analytics workflow for imaging diagnostics on the intelligent integrated digital platform InSilicoKDD
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Big heterogeneous data integration and analysis
Stella Vetova
AIP Conf. Proc. 2333, 030007 (2021) https://doi.org/10.1063/5.0043627
View articletitled, Big heterogeneous data integration and analysis
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Big data workflow platforms for science
Stella Vetova
AIP Conf. Proc. 2333, 030008 (2021) https://doi.org/10.1063/5.0043625
View articletitled, Big data workflow platforms for science
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Interaction between management control systems and big data analytics: A conceptual framework
Mina Daskalova; Desislava Ivanova
AIP Conf. Proc. 2333, 030009 (2021) https://doi.org/10.1063/5.0042254
View articletitled, Interaction between management control systems and big data analytics: A conceptual framework
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A new proposed software development methodology for healthcare industry
Desislаvа Ivаnоvа; Vladimir Kadurin
AIP Conf. Proc. 2333, 030010 (2021) https://doi.org/10.1063/5.0042261
View articletitled, A new proposed software development methodology for healthcare industry
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The intersection of IoT ecosystem security and blockchain technology in the context of industry 4.0
Plamenka Borovska; Martin Gugutkov
AIP Conf. Proc. 2333, 030011 (2021) https://doi.org/10.1063/5.0043741
View articletitled, The intersection of IoT ecosystem security and blockchain technology in the context of industry 4.0
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DIFFERENTIAL EQUATIONS

Solutions of the Dirichlet problem for a fourth-order p-Laplacian differential equation
Meline Aprahamian; Stepan Tersian
AIP Conf. Proc. 2333, 040001 (2021) https://doi.org/10.1063/5.0042055
View articletitled, Solutions of the Dirichlet problem for a fourth-order <em>p</em>-Laplacian differential equation
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Practical stability of differential equations with supremum and non-instantaneous impulses
Snezhana Hristova; Antonia Dobreva
AIP Conf. Proc. 2333, 040002 (2021) https://doi.org/10.1063/5.0041625
View articletitled, Practical stability of differential equations with supremum and non-instantaneous impulses
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Stability with two measures for differential equations with supremum and non-instantaneous impulses
Snezhana Hristova; Antonia Dobreva
AIP Conf. Proc. 2333, 040003 (2021) https://doi.org/10.1063/5.0041626
View articletitled, Stability with two measures for differential equations with supremum and non-instantaneous impulses
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Nonlocal problem for functional evolution inclusions
T. Donchev; S. Hristova; S. Bilal
AIP Conf. Proc. 2333, 040004 (2021) https://doi.org/10.1063/5.0041898
View articletitled, Nonlocal problem for functional evolution inclusions
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For the integrability of the 2D trapped ionic system
Georgi Georgiev
AIP Conf. Proc. 2333, 040005 (2021) https://doi.org/10.1063/5.0041696
View articletitled, For the integrability of the 2D trapped ionic system
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Singular linear-quadratic problem with a terminal condition
A. N. Sesekin; A. A. Frolova
AIP Conf. Proc. 2333, 040006 (2021) https://doi.org/10.1063/5.0041692
View articletitled, Singular linear-quadratic problem with a terminal condition
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Boundary-value problem for ordinary differential equations with double singularity in a critical case
Lyudmil Karandzhulov
AIP Conf. Proc. 2333, 040007 (2021) https://doi.org/10.1063/5.0042436
View articletitled, Boundary-value problem for ordinary differential equations with double singularity in a critical case
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An epidemic model of Covid-19 disease with variable spreading
George Popov; Ognian Nakov
AIP Conf. Proc. 2333, 040008 (2021) https://doi.org/10.1063/5.0041742
View articletitled, An epidemic model of Covid-19 disease with variable spreading
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E-LEARNING

Statistical analysis to evaluate the quality of an online practice test
Vanya Ivanova; Desislava Voynikova
AIP Conf. Proc. 2333, 050001 (2021) https://doi.org/10.1063/5.0041897
View articletitled, Statistical analysis to evaluate the quality of an online practice test
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Repetition of analytic geometry in the plane for students of mechanical engineering
Petra Pirklová; Daniela Bímová
AIP Conf. Proc. 2333, 050002 (2021) https://doi.org/10.1063/5.0042817
View articletitled, Repetition of analytic geometry in the plane for students of mechanical engineering
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Using properties of basic solids and geometric polyhedrons for their constructions
Daniela Bímová; Petra Pirklová
AIP Conf. Proc. 2333, 050003 (2021) https://doi.org/10.1063/5.0042751
View articletitled, Using properties of basic solids and geometric polyhedrons for their constructions
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COVID-19's impact upon the organization of the educational process in the national security system
Petko Dimov; Hristina Dobreva
AIP Conf. Proc. 2333, 050004 (2021) https://doi.org/10.1063/5.0041865
View articletitled, COVID-19's impact upon the organization of the educational process in the national security system
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Structure of an ontology used in a test generation environment
Asya Stoyanova-Doycheva; Nina Stancheva; Vanya Ivanova; Stanimir Stoyanov
AIP Conf. Proc. 2333, 050005 (2021) https://doi.org/10.1063/5.0042057
View articletitled, Structure of an ontology used in a test generation environment
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An idea for conducting the educational process in a virtual-physical space
Todorka Glushkova; Stanimir Stoyanov; Vanya Ivanova; Irina Krasteva
AIP Conf. Proc. 2333, 050006 (2021) https://doi.org/10.1063/5.0041727
View articletitled, An idea for conducting the educational process in a virtual-physical space
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Intelligent game recommendation system
Asya Toskova; Georgi Penchev
AIP Conf. Proc. 2333, 050007 (2021) https://doi.org/10.1063/5.0042063
View articletitled, Intelligent game recommendation system
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Self-assessment activities as factor for driving the learning performance
Malinka Ivanova
AIP Conf. Proc. 2333, 050008 (2021) https://doi.org/10.1063/5.0041755
View articletitled, Self-assessment activities as factor for driving the learning performance
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Enhancing critical thinking skills through the use of ICT in academic writing classes
Maria Todorova; Elena Koleva
AIP Conf. Proc. 2333, 050009 (2021) https://doi.org/10.1063/5.0041810
View articletitled, Enhancing critical thinking skills through the use of ICT in academic writing classes
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Developing a sense of belonging in a collaborative distance learning course: Breaking isolation in online learning
Maria Stoytcheva
AIP Conf. Proc. 2333, 050010 (2021) https://doi.org/10.1063/5.0043330
View articletitled, Developing a sense of belonging in a collaborative distance learning course: Breaking isolation in online learning
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Development of student teachers’ satisfaction with e-learning science courses
Svetlana Angelova
AIP Conf. Proc. 2333, 050011 (2021) https://doi.org/10.1063/5.0042071
View articletitled, Development of student teachers’ satisfaction with e-learning science courses
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Challenges to the development of teachers’ professional digital competences – Bulgarian perspective
Bistra Mizova; Roumiana Peytcheva-Forsyth; Boncho Gospodinov
AIP Conf. Proc. 2333, 050012 (2021) https://doi.org/10.1063/5.0041818
View articletitled, Challenges to the development of teachers’ professional digital competences – Bulgarian perspective
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Forced introduction of e-assessment during COVID-19 pandemic: How did the students feel about that? (Sofia University case)
Roumiana Peytcheva-Forsyth; Lyubka Aleksieva
AIP Conf. Proc. 2333, 050013 (2021) https://doi.org/10.1063/5.0041862
View articletitled, Forced introduction of e-assessment during COVID-19 pandemic: How did the students feel about that? (Sofia University case)
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Integrated continuing assessment in an online course as a mechanism for a smoother transition from face-to-face to distance learning
Roumiana Peytcheva-Forsyth; Stoyan Saev; Blagovesna Yovkova
AIP Conf. Proc. 2333, 050014 (2021) https://doi.org/10.1063/5.0041866
View articletitled, Integrated continuing assessment in an online course as a mechanism for a smoother transition from face-to-face to distance learning
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FRACTIONAL CALCULUS, SPECIAL FUNCTIONS AND APPLICATIONS

Explicit solutions and finite time stability of linear Riemann-Liouville fractional differential equations with a constant delay and non-instantaneous impulses
Snezhana Hristova; Todor Kostadinov; Krasimira Ivanova
AIP Conf. Proc. 2333, 060001 (2021) https://doi.org/10.1063/5.0041628
View articletitled, Explicit solutions and finite time stability of linear Riemann-Liouville fractional differential equations with a constant delay and non-instantaneous impulses
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Fundamental solution of a three-dimensional fractional Jeffreys-type heat equation
Emilia Bazhlekova; Ivan Bazhlekov
AIP Conf. Proc. 2333, 060002 (2021) https://doi.org/10.1063/5.0041618
View articletitled, Fundamental solution of a three-dimensional fractional Jeffreys-type heat equation
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Bessel type functions as multi-index Mittag-Leffler functions: Erdélyi–Kober integral relations
Jordanka Paneva-Konovska
AIP Conf. Proc. 2333, 060003 (2021) https://doi.org/10.1063/5.0041835
View articletitled, Bessel type functions as multi-index Mittag-Leffler functions: Erdélyi–Kober integral relations
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On the stability with respect to manifolds of reaction-diffusion impulsive control fractional-order neural networks with time-varying delays
Gani Stamov; Trayan Stamov; Ivanka Stamova
AIP Conf. Proc. 2333, 060004 (2021) https://doi.org/10.1063/5.0041946
View articletitled, On the stability with respect to manifolds of reaction-diffusion impulsive control fractional-order neural networks with time-varying delays
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Asymptotic stability of nonlinear perturbed neutral linear fractional system with distributed delay
M. Konstantinov; E. Madamlieva; M. Petkova; S. Cholakov
AIP Conf. Proc. 2333, 060005 (2021) https://doi.org/10.1063/5.0041726
View articletitled, Asymptotic stability of nonlinear perturbed neutral linear fractional system with distributed delay
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Fractional derivative modeling of bioreaction-diffusion processes
Ivan Bazhlekov; Emilia Bazhlekova
AIP Conf. Proc. 2333, 060006 (2021) https://doi.org/10.1063/5.0041611
View articletitled, Fractional derivative modeling of bioreaction-diffusion processes
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INFORMATICS AND SOFTWARE SCIENCES

Big data in property management
Miglena Stoyanova; Julian Vasilev; Marian Cristescu
AIP Conf. Proc. 2333, 070001 (2021) https://doi.org/10.1063/5.0041902
View articletitled, Big data in property management
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Steganographic algorithm based on chaotic random system on Raspberry Pi hardware
Hristo Paraskevov; Borislav Stoyanov
AIP Conf. Proc. 2333, 070002 (2021) https://doi.org/10.1063/5.0042205
View articletitled, Steganographic algorithm based on chaotic random system on Raspberry Pi hardware
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Pseudorandom byte generator based on shrinking 128-bit chaotic function
Borislav Stoyanov; Tsvetelina Ivanova
AIP Conf. Proc. 2333, 070003 (2021) https://doi.org/10.1063/5.0041784
View articletitled, Pseudorandom byte generator based on shrinking 128-bit chaotic function
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Double Ikeda map as a source of pseudorandom numbers
Borislav Stoyanov
AIP Conf. Proc. 2333, 070004 (2021) https://doi.org/10.1063/5.0041614
View articletitled, Double Ikeda map as a source of pseudorandom numbers
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Novel hash function using Zaslavsky map
Mihaela Todorova; Borislav Stoyanov
AIP Conf. Proc. 2333, 070005 (2021) https://doi.org/10.1063/5.0041864
View articletitled, Novel hash function using Zaslavsky map
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Implementation of hidden communication channel in OSN with histogram analysis
Hristo Paraskevov; Aleksandar Stefanov
AIP Conf. Proc. 2333, 070006 (2021) https://doi.org/10.1063/5.0041938
View articletitled, Implementation of hidden communication channel in OSN with histogram analysis
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Interpolating subdivision with triangle aspect ratio control
Bozhidar Stanchev; Hristo Paraskevov
AIP Conf. Proc. 2333, 070007 (2021) https://doi.org/10.1063/5.0041939
View articletitled, Interpolating subdivision with triangle aspect ratio control
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A simulation-based study to calculate all the possible trajectories of differential drive mobile robot
Ahmed Ismaiel; M. Yu. Filimonov
AIP Conf. Proc. 2333, 070008 (2021) https://doi.org/10.1063/5.0041751
View articletitled, A simulation-based study to calculate all the possible trajectories of differential drive mobile robot
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A comparative analysis of popular technologies for developing custom visuals
V. Naneva; K. Stefanova
AIP Conf. Proc. 2333, 070009 (2021) https://doi.org/10.1063/5.0042201
View articletitled, A comparative analysis of popular technologies for developing custom visuals
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Optimization techniques for business intelligence reports
V. Naneva; K. Stefanova
AIP Conf. Proc. 2333, 070010 (2021) https://doi.org/10.1063/5.0042199
View articletitled, Optimization techniques for business intelligence reports
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Analysis and modelling of CMOS Gm-C filters through machine learning
Malinka Ivanova
AIP Conf. Proc. 2333, 070011 (2021) https://doi.org/10.1063/5.0041743
View articletitled, Analysis and modelling of CMOS Gm-C filters through machine learning
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Modernization of a cooling water control system for the production of plastic pipes using fuzzy logic
Marin Kochev; Malinka Ivanova
AIP Conf. Proc. 2333, 070012 (2021) https://doi.org/10.1063/5.0042094
View articletitled, Modernization of a cooling water control system for the production of plastic pipes using fuzzy logic
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Text and source readability - A step to cognition
Galina Momcheva; Veselina Spasova; Antonina Ivanova; Milen Zhelyazkov
AIP Conf. Proc. 2333, 070013 (2021) https://doi.org/10.1063/5.0042068
View articletitled, Text and source readability - A step to cognition
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Ontology-based approach for cybersecurity recruitment
Mario Maroun; Antonina Ivanova
AIP Conf. Proc. 2333, 070014 (2021) https://doi.org/10.1063/5.0042320
View articletitled, Ontology-based approach for cybersecurity recruitment
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Hyperparameter adjustment in regression neural networks for predicting support case durations
Hristo Hristov; Galina Momcheva
AIP Conf. Proc. 2333, 070015 (2021) https://doi.org/10.1063/5.0041936
View articletitled, Hyperparameter adjustment in regression neural networks for predicting support case durations
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.NET implementation of electronic circuit design
Valeri Petrov Gochev; Polya Vassileva Gocheva; Nikolay Lyuboslavov Hinov
AIP Conf. Proc. 2333, 070016 (2021) https://doi.org/10.1063/5.0041606
View articletitled, .NET implementation of electronic circuit design
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Artificial intelligence methods used in industry 4.0 in particular industrial control systems
Georgi Tsochev; Maksim Sharabov
AIP Conf. Proc. 2333, 070017 (2021) https://doi.org/10.1063/5.0041610
View articletitled, Artificial intelligence methods used in industry 4.0 in particular industrial control systems
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MATHEMATICAL ANALYSIS AND APPLICATIONS

Related fixed point theorems via a general approach to simulation mappings in b−metric-like spaces
Kastriot Zoto; Anila Sulaj
AIP Conf. Proc. 2333, 080001 (2021) https://doi.org/10.1063/5.0042412
View articletitled, Related fixed point theorems via a general approach to simulation mappings in <em>b</em>−metric-like spaces
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Existence results for a class of third order equations with sign-changing green’s function
Nikolay D. Dimitrov
AIP Conf. Proc. 2333, 080002 (2021) https://doi.org/10.1063/5.0041737
View articletitled, Existence results for a class of third order equations with sign-changing green’s function
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Remarks on the coincidence of the left-side and right-side fractional derivatives on an interval and some consequences
Hristo Kiskinov; Milena Petkova; Andrey Zahariev
AIP Conf. Proc. 2333, 080003 (2021) https://doi.org/10.1063/5.0041754
View articletitled, Remarks on the coincidence of the left-side and right-side fractional derivatives on an interval and some consequences
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Numerical method for solving two-dimensional nonlinear Hammerstein-Fredholm fuzzy functional integral equations
Atanaska Georgieva; Iva Naydenova
AIP Conf. Proc. 2333, 080004 (2021) https://doi.org/10.1063/5.0041601
View articletitled, Numerical method for solving two-dimensional nonlinear Hammerstein-Fredholm fuzzy functional integral equations
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Solving nonlinear Volterra-Fredholm fuzzy integro-differential equations by using Adomian decomposition method
Atanaska Georgieva; Mira Spasova
AIP Conf. Proc. 2333, 080005 (2021) https://doi.org/10.1063/5.0041602
View articletitled, Solving nonlinear Volterra-Fredholm fuzzy integro-differential equations by using Adomian decomposition method
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Application of double fuzzy natural transform for solving fuzzy partial equations
Atanaska Georgieva
AIP Conf. Proc. 2333, 080006 (2021) https://doi.org/10.1063/5.0041603
View articletitled, Application of double fuzzy natural transform for solving fuzzy partial equations
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“Analytical” functions of polynomial type
Vladimir Todorov Todorov
AIP Conf. Proc. 2333, 080007 (2021) https://doi.org/10.1063/5.0042081
View articletitled, “Analytical” functions of polynomial type
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On some application on coupled and best proximity points theorems
Miroslav Hristov; Atanas Ilchev; Boyan Zlatanov
AIP Conf. Proc. 2333, 080008 (2021) https://doi.org/10.1063/5.0041716
View articletitled, On some application on coupled and best proximity points theorems
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NUMERICAL METHODS AND MATHEMATICAL MODELING

Hybrid approach Wavelet seasonal autoregressive integrated moving average model (WSARIMA) for modeling time series
Zuzana Janková; Petr Dostál
AIP Conf. Proc. 2333, 090001 (2021) https://doi.org/10.1063/5.0041734
View articletitled, Hybrid approach Wavelet seasonal autoregressive integrated moving average model (WSARIMA) for modeling time series
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Sigmoid models for Covid-19 pandemic
M. Konstantinov; K. Konstantinov; S. Konstantinov
AIP Conf. Proc. 2333, 090002 (2021) https://doi.org/10.1063/5.0041728
View articletitled, Sigmoid models for Covid-19 pandemic
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Deterministic modelling of a management system with protected access to virtual resources
Radi Romansky; Irina Noninska
AIP Conf. Proc. 2333, 090003 (2021) https://doi.org/10.1063/5.0041760
View articletitled, Deterministic modelling of a management system with protected access to virtual resources
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Numerical analysis of a finite difference scheme for optimal portfolio in a power utility regime-switching model
Miglena N. Koleva; Lubin G. Vulkov
AIP Conf. Proc. 2333, 090004 (2021) https://doi.org/10.1063/5.0041973
View articletitled, Numerical analysis of a finite difference scheme for optimal portfolio in a power utility regime-switching model
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Numerical material identification of subsurface flow in unsaturated soil
Miglena N. Koleva; Lubin G. Vulkov
AIP Conf. Proc. 2333, 090005 (2021) https://doi.org/10.1063/5.0041974
View articletitled, Numerical material identification of subsurface flow in unsaturated soil
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Simultaneous identification of time-dependent volatility and interest rate for European options
Slavi G. Georgiev; Lubin G. Vulkov
AIP Conf. Proc. 2333, 090006 (2021) https://doi.org/10.1063/5.0041788
View articletitled, Simultaneous identification of time-dependent volatility and interest rate for European options
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Parameter identification modeling honey bee colony population dynamics
Atanas Z. Atanasov; Slavi G. Georgiev
AIP Conf. Proc. 2333, 090007 (2021) https://doi.org/10.1063/5.0041790
View articletitled, Parameter identification modeling honey bee colony population dynamics
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A multicriteria model for optimal location of honey bee colonies in regions without overpopulation
Atanas Z. Atanasov; Ivan R. Georgiev
AIP Conf. Proc. 2333, 090008 (2021) https://doi.org/10.1063/5.0041729
View articletitled, A multicriteria model for optimal location of honey bee colonies in regions without overpopulation
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A numerical parameter reconstruction in a model of a honey bee population
Atanas Z. Atanasov; Slavi G. Georgiev
AIP Conf. Proc. 2333, 090009 (2021) https://doi.org/10.1063/5.0041791
View articletitled, A numerical parameter reconstruction in a model of a honey bee population
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Using Markov's chains for reliability modeling of wireless electrical vehicles charging
Prodan Prodanov; Nikolay Madzharov; Dobroslav Dankov
AIP Conf. Proc. 2333, 090010 (2021) https://doi.org/10.1063/5.0041941
View articletitled, Using Markov's chains for reliability modeling of wireless electrical vehicles charging
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Simulation of thermal effects of engineering objects in the arctic regions on the permafrost boundaries
N. A. Vaganova; M. Yu. Filimonov
AIP Conf. Proc. 2333, 090011 (2021) https://doi.org/10.1063/5.0041816
View articletitled, Simulation of thermal effects of engineering objects in the arctic regions on the permafrost boundaries
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Analysis of reliability and preventive maintenance of wireless electrical vehicles charging station
Nikolay Madzharov; Prodan Prodanov
AIP Conf. Proc. 2333, 090012 (2021) https://doi.org/10.1063/5.0042273
View articletitled, Analysis of reliability and preventive maintenance of wireless electrical vehicles charging station
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Linear regression modeling in monitoring tasks based on the method of least absolute deviations
Alexander Tyrsin; Aleksan Azaryan
AIP Conf. Proc. 2333, 090013 (2021) https://doi.org/10.1063/5.0041859
View articletitled, Linear regression modeling in monitoring tasks based on the method of least absolute deviations
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Determination of concentration source in a fractional derivative model of atmospheric pollution
J. Kandilarov; L. Vulkov
AIP Conf. Proc. 2333, 090014 (2021) https://doi.org/10.1063/5.0042092
View articletitled, Determination of concentration source in a fractional derivative model of atmospheric pollution
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Modeling and optimization of a coil for contactless energy transmission
Hristo Ibrishimov; Khristo Tarnev; Nikolay Hinov
AIP Conf. Proc. 2333, 090015 (2021) https://doi.org/10.1063/5.0041766
View articletitled, Modeling and optimization of a coil for contactless energy transmission
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DG method for numerical option pricing under the merton short rate model
Jiří Hozman; Tomáš Tichý
AIP Conf. Proc. 2333, 090016 (2021) https://doi.org/10.1063/5.0041933
View articletitled, DG method for numerical option pricing under the merton short rate model
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Hierarchy of intercity transport network elements and the gravity model for the origin-destination matrix
Alexander Martynenko
AIP Conf. Proc. 2333, 090017 (2021) https://doi.org/10.1063/5.0041823
View articletitled, Hierarchy of intercity transport network elements and the gravity model for the origin-destination matrix
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Features of optimal control problem moving bodies with variable geometry in a viscous medium with non-constant density
Dmitry Zavalishchin
AIP Conf. Proc. 2333, 090018 (2021) https://doi.org/10.1063/5.0041699
View articletitled, Features of optimal control problem moving bodies with variable geometry in a viscous medium with non-constant density
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Estimation of the error in forecasting the consumption of the natural gas of the freight schedule per subscriber according to the seasons
Silvia Baeva; Ivelina Hinova
AIP Conf. Proc. 2333, 090019 (2021) https://doi.org/10.1063/5.0041824
View articletitled, Estimation of the error in forecasting the consumption of the natural gas of the freight schedule per subscriber according to the seasons
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Stochastic model for prediction of microgrid photovoltaic power generation
Silvia Baeva; Rad Stanev; Stoyan Popov; Nikolay Hinov
AIP Conf. Proc. 2333, 090020 (2021) https://doi.org/10.1063/5.0041825
View articletitled, Stochastic model for prediction of microgrid photovoltaic power generation
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Error estimation of vehicle traffic intensity prediction in an urban environment
Stoyan Popov; Vasil Shterev; Silvia Baeva; Darius Andriukaitis; Nikolay Hinov
AIP Conf. Proc. 2333, 090021 (2021) https://doi.org/10.1063/5.0041877
View articletitled, Error estimation of vehicle traffic intensity prediction in an urban environment
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Stochastic model for microgrid load forecasting
Stoyan Popov; Rad Stanev; Silvia Baeva; Nikolay Hinov
AIP Conf. Proc. 2333, 090022 (2021) https://doi.org/10.1063/5.0041882
View articletitled, Stochastic model for microgrid load forecasting
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A mathematical model of the layered plate throwing by detonation products
Y. P. Besschaposchnikov; V. V. Pai; V. I. Chernukhin; A. A. Petunin
AIP Conf. Proc. 2333, 090023 (2021) https://doi.org/10.1063/5.0041899
View articletitled, A mathematical model of the layered plate throwing by detonation products
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Mathematical and computer modeling of COVID-19 transmission dynamics in Bulgaria by time-depended inverse SEIR model
Svetozar Margenov; Nedyu Popivanov; Iva Ugrinova; Stanislav Harizanov; Tsvetan Hristov
AIP Conf. Proc. 2333, 090024 (2021) https://doi.org/10.1063/5.0041868
View articletitled, Mathematical and computer modeling of COVID-19 transmission dynamics in Bulgaria by time-depended inverse SEIR model
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On the problem of mathematical modeling of combustion processes
E. V. Radkevich; N. N. Yakovlev; O. A. Vasil’eva
AIP Conf. Proc. 2333, 090025 (2021) https://doi.org/10.1063/5.0042940
View articletitled, On the problem of mathematical modeling of combustion processes
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Simulation and integrated uncertainty analysis of the OECD/ NEA V1000CT2 vessel mixing problem with RELAP/ SCDAPSIM mod3.5
I. Spasov; G. Gerova; K. Filipov; Al. Grigorov; N. P. Kolev
AIP Conf. Proc. 2333, 090026 (2021) https://doi.org/10.1063/5.0042209
View articletitled, Simulation and integrated uncertainty analysis of the OECD/ NEA V1000CT2 vessel mixing problem with RELAP/ SCDAPSIM mod3.5
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An approach to path control design for nonholonomic unicycle-type mobile robots based on linear control theory
Plamen Petrov; Ivan Kralov
AIP Conf. Proc. 2333, 090027 (2021) https://doi.org/10.1063/5.0041616
View articletitled, An approach to path control design for nonholonomic unicycle-type mobile robots based on linear control theory
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Practical approach for modeling and simulation closed loop DC-DC converters
Nikolay Hinov; Ivan Hristov
AIP Conf. Proc. 2333, 090028 (2021) https://doi.org/10.1063/5.0041607
View articletitled, Practical approach for modeling and simulation closed loop DC-DC converters
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Geometric synthesis of flywheel energy storage design
Krasimir Nedelchev; Mario Semkov; Ivan Kralov
AIP Conf. Proc. 2333, 090029 (2021) https://doi.org/10.1063/5.0045295
View articletitled, Geometric synthesis of fly<em>w</em>heel energy storage design
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Investigation of the influence of the number of rows in sonic crystal acoustic barriers with cylindrical elements on their acoustic characteristics
Ivan Kralov; Krasimir Nedelchev; Elitsa Gieva; Ivelina Ruskova
AIP Conf. Proc. 2333, 090030 (2021) https://doi.org/10.1063/5.0042035
View articletitled, Investigation of the influence of the number of rows in sonic crystal acoustic barriers with cylindrical elements on their acoustic characteristics
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A simulator of vertical u-tube steam generator in SCILAB environment
Aleksey Nikolov; Vesela Pasheva; Gergana Gerova
AIP Conf. Proc. 2333, 090031 (2021) https://doi.org/10.1063/5.0041750
View articletitled, A simulator of vertical u-tube steam generator in SCILAB environment
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Model-based synthesis of control for power electronic converters
Bogdan Gilev; Nikolay Hinov
AIP Conf. Proc. 2333, 090032 (2021) https://doi.org/10.1063/5.0041944
View articletitled, Model-based synthesis of control for power electronic converters
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Improving the dynamics of power electronic devices based on mathematical models
Bogdan Gilev; Nikolay Hinov
AIP Conf. Proc. 2333, 090033 (2021) https://doi.org/10.1063/5.0041945
View articletitled, Improving the dynamics of power electronic devices based on mathematical models
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Modeling of hybrid DC-DC converter for autonomous power supply
Nikolay Hinov; Gergana Vacheva; Bogdan Gilev
AIP Conf. Proc. 2333, 090034 (2021) https://doi.org/10.1063/5.0041609
View articletitled, Modeling of hybrid DC-DC converter for autonomous power supply
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Modeling and simulation of hybrid electric vehicles
Gergana Vacheva; Nikolay Hinov
AIP Conf. Proc. 2333, 090035 (2021) https://doi.org/10.1063/5.0041853
View articletitled, Modeling and simulation of hybrid electric vehicles
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Modeling of information exchange between power electronic units in energy storage systems
Ivan Nedyalkov; Dimitar Arnaudov; Tasho D. Tashev
AIP Conf. Proc. 2333, 090036 (2021) https://doi.org/10.1063/5.0041817
View articletitled, Modeling of information exchange between power electronic units in energy storage systems
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Modeling and optimization of the algorithm of operation of a battery management system
Dimitar Arnaudov; Krasimir Kishkin; Dimitar Penev
AIP Conf. Proc. 2333, 090037 (2021) https://doi.org/10.1063/5.0041820
View articletitled, Modeling and optimization of the algorithm of operation of a battery management system
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Model based design of a multiphase topology for energy storage systems
Dimitar Arnaudov
AIP Conf. Proc. 2333, 090038 (2021) https://doi.org/10.1063/5.0041821
View articletitled, Model based design of a multiphase topology for energy storage systems
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Generalized nets model of the LPF-algorithm of the crossbar switch node for determining LPF-execution time complexity
Tasho D. Tashev; Marin B. Marinov; Radostina P. Tasheva; Alexander K. Alexandrov
AIP Conf. Proc. 2333, 090039 (2021) https://doi.org/10.1063/5.0042856
View articletitled, Generalized nets model of the LPF-algorithm of the crossbar switch node for determining LPF-execution time complexity
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OPERATIONS RESEARCH, ECONOMICS, PROGRAMMING

Vector error correction model assessing the impact of consumption, investment and export on import on Bulgarian economy
Miroslava Ivanova; Rumyana Angelova; Lilko Dospatliev
AIP Conf. Proc. 2333, 100001 (2021) https://doi.org/10.1063/5.0041752
View articletitled, Vector error correction model assessing the impact of consumption, investment and export on import on Bulgarian economy
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Evaluation of origin-destination matrices based on analysis of data on transport passenger flows
Galina Timofeeva; Olga Ie
AIP Conf. Proc. 2333, 100002 (2021) https://doi.org/10.1063/5.0041801
View articletitled, Evaluation of origin-destination matrices based on analysis of data on transport passenger flows
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Construction of the payoff matrix for the loyalty program model
Dmitry Zavalishchin; Artem Khazimullin
AIP Conf. Proc. 2333, 100003 (2021) https://doi.org/10.1063/5.0041702
View articletitled, Construction of the payoff matrix for the loyalty program model
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Application of blockchain technologies and game approach in the educational process of universities
Anton Panachev; Vladislav Shcherbitsky; Maxim A. Medvedev
AIP Conf. Proc. 2333, 100004 (2021) https://doi.org/10.1063/5.0042076
View articletitled, Application of blockchain technologies and game approach in the educational process of universities
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Statistical data and programming languages analysis for developing a chatbot in telegram
Victoria O. Rytikova; Maxim A. Medvedev
AIP Conf. Proc. 2333, 100005 (2021) https://doi.org/10.1063/5.0041762
View articletitled, Statistical data and programming languages analysis for developing a chatbot in telegram
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Simulation modeling of a warehouse logistics department of a medium-sized company
George Popov; Kiril Anguelov; Antoaneta Popova
AIP Conf. Proc. 2333, 100006 (2021) https://doi.org/10.1063/5.0041756
View articletitled, Simulation modeling of a warehouse logistics department of a medium-sized company
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Efficiency of the management of parallel activities in the business enterprise
George Popov; Kiril Anguelov; Antoaneta Popova
AIP Conf. Proc. 2333, 100007 (2021) https://doi.org/10.1063/5.0041744
View articletitled, Efficiency of the management of parallel activities in the business enterprise
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OTHER

Ulam type stability for scalar nonlinear non-instantaneous impulsive difference equations with computer realization
Snezhana Hristova; Kremena Stefanova
AIP Conf. Proc. 2333, 110001 (2021) https://doi.org/10.1063/5.0041629
View articletitled, Ulam type stability for scalar nonlinear non-instantaneous impulsive difference equations with computer realization
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On the classical diophantine equation x4 + y4 + kx2y2 = z2
Miroslav Stoenchev; Venelin Todorov
AIP Conf. Proc. 2333, 110002 (2021) https://doi.org/10.1063/5.0042739
View articletitled, On the classical diophantine equation <em>x</em><sup>4</sup> + <em>y</em><sup>4</sup> + <em>kx</em><sup>2</sup><em>y</em><sup>2</sup> = <em>z</em><sup>2</sup>
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Derivations in a product of additively idempotent semirings
Ivan Trendafilov; Radoslav Tzvetkov
AIP Conf. Proc. 2333, 110003 (2021) https://doi.org/10.1063/5.0042512
View articletitled, Derivations in a product of additively idempotent semirings
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Subsemirings of the endomorphism semiring of the interval [0, 1]
Martin Rachev
AIP Conf. Proc. 2333, 110004 (2021) https://doi.org/10.1063/5.0042750
View articletitled, Subsemirings of the endomorphism semiring of the interval [0, 1]
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Information modeling of firm competitiveness
Adelina Ivanova; Boryana Deliyska; Radostina Popova-Terziyska
AIP Conf. Proc. 2333, 110005 (2021) https://doi.org/10.1063/5.0042961
View articletitled, Information modeling of firm competitiveness
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Domain ontology of social sustainable development
Adelina Ivanova; Boryana Deliyska; Vladislav Todorov
AIP Conf. Proc. 2333, 110006 (2021) https://doi.org/10.1063/5.0042253
View articletitled, Domain ontology of social sustainable development
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Approximate solution of two-dimensional Hammerstein-Volterra fuzzy integral equations with partial integrals
Albena Pavlova; Radka Koleva
AIP Conf. Proc. 2333, 110007 (2021) https://doi.org/10.1063/5.0041815
View articletitled, Approximate solution of two-dimensional Hammerstein-Volterra fuzzy integral equations with partial integrals
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Digital twin definition based on virtual prototype evolution of an UPS with kinetic battery accumulator
Georgi Todorov; Blagovest Zlatev; Konstantin Kamberov
AIP Conf. Proc. 2333, 110008 (2021) https://doi.org/10.1063/5.0044792
View articletitled, Digital twin definition based on virtual prototype evolution of an UPS with kinetic battery accumulator
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Methodology for designing, manufacturing and integration of personalized spinal implants for surgical treatment of the cervical spine
Konstantin Kamberov; George Todorov; Yavor Sofronov; Nikolay Nikolov
AIP Conf. Proc. 2333, 110009 (2021) https://doi.org/10.1063/5.0042381
View articletitled, Methodology for designing, manufacturing and integration of personalized spinal implants for surgical treatment of the cervical spine
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Comparison of stress distribution on periodontally compromised mobile teeth splinted and non- splinted using finite element method
Mario Semkov; Krasimira Dimova
AIP Conf. Proc. 2333, 110010 (2021) https://doi.org/10.1063/5.0044796
View articletitled, Comparison of stress distribution on periodontally compromised mobile teeth splinted and non- splinted using finite element method
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Improvement of undershot water wheel performance through virtual prototyping
Georgi Todorov; Konstantin Kamberov; Mario Semkov
AIP Conf. Proc. 2333, 110011 (2021) https://doi.org/10.1063/5.0043502
View articletitled, Improvement of undershot water wheel performance through virtual prototyping
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Basic law of the flat interlocking of involute cylindrical gears with asymmetric profiles
Genadi Cvetanov; Tsanko Karadzhov; Rosica Miteva
AIP Conf. Proc. 2333, 110012 (2021) https://doi.org/10.1063/5.0042513
View articletitled, Basic law of the flat interlocking of involute cylindrical gears with asymmetric profiles
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Determination of the elastic displacements in plain strained condition of involute cylindrical gears with asymmetric profile
Genadi Cvetanov; Tsanko Karadzhov; Rosica Miteva
AIP Conf. Proc. 2333, 110013 (2021) https://doi.org/10.1063/5.0042511
View articletitled, Determination of the elastic displacements in plain strained condition of involute cylindrical gears with asymmetric profile
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Granger causality networks of S&P 500 stocks
Mariana Durcheva; Pavel Tsankov
AIP Conf. Proc. 2333, 110014 (2021) https://doi.org/10.1063/5.0041747
View articletitled, Granger causality networks of S&amp;P 500 stocks
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PARTIAL DIFFERENTIAL EQUATIONS AND APPLICATIONS

Application of series with recurrently calculated coefficients for solving initial-boundary value problems for nonlinear wave equations
M. Yu. Filimonov; N. A. Vaganova
AIP Conf. Proc. 2333, 120001 (2021) https://doi.org/10.1063/5.0041819
View articletitled, Application of series with recurrently calculated coefficients for solving initial-boundary value problems for nonlinear wave equations
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Some results about conformable derivatives in banach spaces and an application to the partial differential equations
Hristo Kiskinov; Milena Petkova; Andrey Zahariev; Magdalena Veselinova
AIP Conf. Proc. 2333, 120002 (2021) https://doi.org/10.1063/5.0041758
View articletitled, Some results about conformable derivatives in banach spaces and an application to the partial differential equations
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Asymptotic study of heat and mass transfer processes in viscous fluids
Petr A. Velmisov; Usama J. Mizher
AIP Conf. Proc. 2333, 120003 (2021) https://doi.org/10.1063/5.0041780
View articletitled, Asymptotic study of heat and mass transfer processes in viscous fluids
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Mathematical modelling of pressure monitoring systems in fluid and gaseous media
Petr Velmisov; Yuliya Tamarova; Yuliya Pokladova
AIP Conf. Proc. 2333, 120004 (2021) https://doi.org/10.1063/5.0041778
View articletitled, Mathematical modelling of pressure monitoring systems in fluid and gaseous media
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Axisymmetric problem of non-stationary Navier-Stokes equations coupled with the heat equation
M. El Hatri; R. Ghenji; N. Popivanov
AIP Conf. Proc. 2333, 120005 (2021) https://doi.org/10.1063/5.0041937
View articletitled, Axisymmetric problem of non-stationary Navier-Stokes equations coupled with the heat equation
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Pohozhaev type identity for a nonlinear mixed type equation with two orthogonal degeneration lines
Nedyu Popivanov; Evgeny Moiseev; Yani Boshev
AIP Conf. Proc. 2333, 120006 (2021) https://doi.org/10.1063/5.0041870
View articletitled, Pohozhaev type identity for a nonlinear mixed type equation with two orthogonal degeneration lines
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Optimal steady state of distributed population in periodic environment
Alexey Davydov
AIP Conf. Proc. 2333, 120007 (2021) https://doi.org/10.1063/5.0041960
View articletitled, Optimal steady state of distributed population in periodic environment
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Extended Strichartz estimates for the heat equation with a Strichartz type potential
Elena Nikolova; Mirko Tarulli; George Venkov
AIP Conf. Proc. 2333, 120008 (2021) https://doi.org/10.1063/5.0042670
View articletitled, Extended Strichartz estimates for the heat equation with a Strichartz type potential
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Integral form of the generalized solution of a Darboux-Goursat problem with third-type boundary condition
Aleksey Nikolov
AIP Conf. Proc. 2333, 120009 (2021) https://doi.org/10.1063/5.0041745
View articletitled, Integral form of the generalized solution of a Darboux-Goursat problem with third-type boundary condition
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SOFTWARE INNOVATIONS IN SCIENTIFIC COMPUTING

Rotating range sensor approached for mobile robot obstacle detection and collision avoidance applications
Ahmed Ismaiel; M. Yu. Filimonov
AIP Conf. Proc. 2333, 130001 (2021) https://doi.org/10.1063/5.0041746
View articletitled, Rotating range sensor approached for mobile robot obstacle detection and collision avoidance applications
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SOFTWARE SCIENCES AND INNOVATION FOR INTERACTIVE PRESENTATION OF BULGARIAN CULTURAL AND HISTORICAL HERITAGE

Data exploration of historical and cultural content in an interactive web based system with geolocation
Alexander Petkov
AIP Conf. Proc. 2333, 140001 (2021) https://doi.org/10.1063/5.0042262
View articletitled, Data exploration of historical and cultural content in an interactive web based system with geolocation
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A flexible framework for web-based virtual reality presentation of cultural heritage
Dimo Chotrov; Angel Bachvarov
AIP Conf. Proc. 2333, 140002 (2021) https://doi.org/10.1063/5.0042542
View articletitled, A flexible framework for web-based virtual reality presentation of cultural heritage
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Usability strategy and guidelines for building an accessible web portal
Desislava Ivanova; Daniel Mitev
AIP Conf. Proc. 2333, 140003 (2021) https://doi.org/10.1063/5.0042257
View articletitled, Usability strategy and guidelines for building an accessible web portal
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Mobile application for interactive discovery of Bulgarian cultural and historical places
Desislava Ivanova; Vladimir Kadurin
AIP Conf. Proc. 2333, 140004 (2021) https://doi.org/10.1063/5.0042259
View articletitled, Mobile application for interactive discovery of Bulgarian cultural and historical places
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STATISTICS, PROBABILITY THEORY

IPO and IPO-NM estimators in exponentiated Fréchet case
Pavlina K. Jordanova; Gyurhan H. Nedzhibov
AIP Conf. Proc. 2333, 150001 (2021) https://doi.org/10.1063/5.0044136
View articletitled, IPO and IPO-NM estimators in exponentiated Fréchet case
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Inference for the covariance and correlation matrices of multivariate sample using Wishart distribution
Anna Nikolova; Krasimira Prodanova
AIP Conf. Proc. 2333, 150002 (2021) https://doi.org/10.1063/5.0042853
View articletitled, Inference for the covariance and correlation matrices of multivariate sample using Wishart distribution
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Outcome of liver transplantation in adult population in Bulgaria
Nonka Yurukova; Milena Peruhova; Krasimira Prodanova
AIP Conf. Proc. 2333, 150003 (2021) https://doi.org/10.1063/5.0041714
View articletitled, Outcome of liver transplantation in adult population in Bulgaria
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Moment problem and entropy convergence: A unified approach
Mariyan Milev; Aldo Tagliani
AIP Conf. Proc. 2333, 150004 (2021) https://doi.org/10.1063/5.0041779
View articletitled, Moment problem and entropy convergence: A unified approach
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Modeling the transportation assesment with MS excel solver
Velika Kuneva; Marian Milev; Margarita Gocheva
AIP Conf. Proc. 2333, 150005 (2021) https://doi.org/10.1063/5.0042520
View articletitled, Modeling the transportation assesment with MS excel solver
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ML-based predictive modelling of stock market returns
Boryana Bogdanova; Eleonora Stancheva-Todorova
AIP Conf. Proc. 2333, 150006 (2021) https://doi.org/10.1063/5.0042805
View articletitled, ML-based predictive modelling of stock market returns
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Enhancing investors’ decision-making – An interdisciplinary AI-based case study for accounting students
Eleonora Stancheva-Todorova; Boryana Bogdanova
AIP Conf. Proc. 2333, 150007 (2021) https://doi.org/10.1063/5.0041612
View articletitled, Enhancing investors’ decision-making – An interdisciplinary AI-based case study for accounting students
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Development of a model of the gross regional product of the Kurgan region
Alexander M. Tarasyev; Julian Vasilev; Victoria F. Turygina; Alla V. Usova
AIP Conf. Proc. 2333, 150008 (2021) https://doi.org/10.1063/5.0041769
View articletitled, Development of a model of the gross regional product of the Kurgan region
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Analysis of data on sources of official statistics, development strategy of the Kurgan region
Alexander M. Tarasyev; Julian Vasilev; Victoria F. Turygina; Anna D. Panchenko
AIP Conf. Proc. 2333, 150009 (2021) https://doi.org/10.1063/5.0041773
View articletitled, Analysis of data on sources of official statistics, development strategy of the Kurgan region
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The effect of activities as prevention tool for elderly people in Europe from depression
Boryana Bogdanova; Bozhidar Nedev
AIP Conf. Proc. 2333, 150010 (2021) https://doi.org/10.1063/5.0042807
View articletitled, The effect of activities as prevention tool for elderly people in Europe from depression
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Cross-sectional differences in the level of depression for elderly people in Europe
Bozhidar Nedev; Boryana Bogdanova
AIP Conf. Proc. 2333, 150011 (2021) https://doi.org/10.1063/5.0041786
View articletitled, Cross-sectional differences in the level of depression for elderly people in Europe
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Enumerative outcome process of a combination scheme
N. Yu. Enatskaya
AIP Conf. Proc. 2333, 150012 (2021) https://doi.org/10.1063/5.0042971
View articletitled, Enumerative outcome process of a combination scheme
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Inference for non-central Pólya-Aeppli distribution
Krasimira Kostadinova
AIP Conf. Proc. 2333, 150013 (2021) https://doi.org/10.1063/5.0041713
View articletitled, Inference for non-central Pólya-Aeppli distribution
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Topic modeling of chat data: A case study in the banking domain
Gloria Hristova
AIP Conf. Proc. 2333, 150014 (2021) https://doi.org/10.1063/5.0044139
View articletitled, Topic modeling of chat data: A case study in the banking domain
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Prediction of lethal outcome in pediatric liver transplantation using duration of mechanical ventilation
Yordanka Uzunova; Krasimira Prodanova; Lyubomir Spasov
AIP Conf. Proc. 2333, 150015 (2021) https://doi.org/10.1063/5.0041943
View articletitled, Prediction of lethal outcome in pediatric liver transplantation using duration of mechanical ventilation
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Phytochemical analysis of bioactive compounds in ethanolic extract of Sterculia quadrifida R.Br.
MRI image processing method on brain tumors: A review
The design and optimization process of ball mill to reduce particle size of calcium carbonate materials
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