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This book includes 15 articles published in the Special Issue "Theoretical Computer Science and Discrete Mathematics" of Symmetry (ISSN 2073-8994). This Special Issue is devoted to original and significant contributions to theoretical computer science and discrete mathematics. The aim was to bring together research papers linking different areas of discrete mathematics and theoretical computer science, as well as applications of discrete mathematics to other areas of science and technology. The Special Issue covers topics in discrete mathematics including (but not limited to) graph theory, cryptography, numerical semigroups, discrete optimization, algorithms, and complexity.

fuzzy set --- n-Pythagorean --- n-PFS algebra --- triangular norms --- outer-independent Roman domination --- Roman domination --- vertex cover --- rooted product graph --- total domination --- domination --- secure domination --- secure Italian domination --- weak roman domination --- w-domination --- cryptanalysis --- group key establishment --- topology optimization --- optimization --- filtering --- method --- penalization --- weight factor --- FEM --- MATLAB --- SIMP --- estimated prime factor --- integer factorisation problem --- continued fraction --- Fermat’s Factoring Algorithm --- genetic algorithm --- AES(t) --- heuristics --- microaggregation --- statistical disclosure control --- graph theory --- traveling salesman problem --- data privacy --- location privacy --- differentials in graphs --- strong differential --- quasi-total strong differential --- quasi-total Italian domination number --- numerical semigroup --- forest --- ordinarization transform --- quasi-ordinarization transform --- load redistribution --- leveling power consumption per phase --- three-phase asymmetric distribution networks --- ideal power consumption --- mixed-integer convex optimization --- strongly total Roman domination --- total Roman domination --- lexicographic product graph --- improved crow search algorithm --- normal Gaussian distribution --- phase swapping problem --- power losses --- asymmetric distribution grids --- vortex search algorithm --- nonidentical parallel production lines --- axle housing machining --- mixed model production --- eligibility constraint --- fuzzy due date --- grey wolf optimizer --- n/a --- Fermat's Factoring Algorithm

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The transition to 100% renewable energy in the future is one of the most important ways of achieving "carbon peaking and carbon neutrality" and of reducing the adverse effects of climate change. In this process, the safe, stable and economical operation of renewable energy generation systems, represented by hydro-, wind and solar power, is particularly important, and has naturally become a key concern for researchers and engineers. Therefore, this book focuses on the fundamental and applied research on the modeling, control, monitoring and diagnosis of renewable energy generation systems, especially hydropower energy systems, and aims to provide some theoretical reference for researchers, power generation departments or government agencies.

Research & information: general --- Physics --- doubly-fed variable-speed pumped storage --- Hopf bifurcation --- stability analysis --- parameter sensitivity --- pumped storage unit --- degradation trend prediction --- maximal information coefficient --- light gradient boosting machine --- variational mode decomposition --- gated recurrent unit --- high proportional renewable power system --- active power --- change point detection --- maximum information coefficient --- cosine similarity --- anomaly detection --- thermal-hydraulic characteristics --- hydraulic oil viscosity --- hydraulic PTO --- wave energy converter --- pumped storage units --- pressure pulsation --- noise reduction --- sparrow search algorithm --- hybrid system --- facility agriculture --- chaotic particle swarms method --- operation strategy --- stochastic dynamic programming (SDP) --- power yield --- seasonal price --- reliability --- cascaded reservoirs --- doubly-fed variable speed pumped storage power station --- nonlinear modeling --- nonlinear pump turbine characteristics --- pumped storage units (PSUs) --- successive start-up --- ‘S’ characteristics --- low water head conditions --- multi-objective optimization --- fractional order PID controller (FOPID) --- hydropower units --- comprehensive deterioration index --- long and short-term neural network --- ensemble empirical mode decomposition --- approximate entropy --- 1D–3D coupling model --- transition stability --- sensitivity analysis --- hydro power

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One of the most significant of the many challenges we face is how to sustain the production of food for a growing population without compromising the health of our planet. This book addresses the growing challenges of the interrelated issues of food security, social stability, and the increasing scarcity of the planet’s resources to propose sophisticated modeling innovations leading to practical approaches and solutions to multiple facets of these challenges.

tourism management --- hybrid method --- fruit fly optimization algorithm --- neural network --- web search data --- forecast of daily tourism demand --- optimization method --- robust optimization --- capital to risk asset ratio --- chance constraint --- safety-first principle --- Basel III --- capital requirements --- TOPSIS --- coordinated TOPSIS --- decision-making --- assessment --- coefficient of variation --- information entropy --- probabilistic analysis --- optimization --- Lagrange equations --- operations research --- bomb fragmentation --- digital supply chain --- smart contracts --- dynamic inventory --- revenue sharing contract --- dual-channel --- two sales periods --- channel structure strategy --- strategic consumers --- Nash game --- integrated --- production scheduling --- distribution --- large neighborhood search algorithm --- duality theory --- uncertain set --- logistics production --- inventory process --- balanced scorecard --- Bradley-Terry --- performance evaluation --- software factory --- multiple-criteria decision-making --- AHP --- value relevance --- book value --- abnormal earnings --- R &amp --- D --- panel data

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This Special Issue collects ten articles related to the broadly understood physical properties of intermetallic compounds. Differential thermal analysis was carried out, and the temperatures of thermal effects that arise during the reduction of neodymium from a technological salt mixture of KCl–NaCl–CaCl2–NdF3 with a magnesium–zinc alloy were established. For sol–gel products of stoichiometric MgTiO3, accurate thermal expansion coefficients were measured. The effect of various nanoparticles, such as GaF3, ZnF2, Zn(BF4)2 and Ga2O3 additions, on the activity of CsF-RbF-AlF3 flux and mechanical behavior of Al/Steel brazed joints is presented. The effect of Bi substitution on the structural and magnetic properties of Nd1-xBixMnO3 is investigated. Characteristics of hard magnetic materials based on Nd2Fe14B and Ce2Fe14B intermetallic compounds are presented. A special algorithm is presented to support vector regression for estimating the maximum magnetic entropy change of doped manganite-based compounds. We have received information about the mechanical properties of the reactively synthesized porous Ti3SiC2 compound with different apertures. Furthermore, we have presented the experimental results of Zn-doped Al-rich for fast on-board hydrogen production.

Ti3SiC2 --- intermetallic compound --- porous material --- mechanical property --- pore size --- elastic modulus --- Al-rich alloy --- hydrogen generation --- Zn addition --- Ga2O3 --- flux --- Zn-Al filler metal --- wettability --- spreadability --- magnetocaloric effect --- support vector regression --- extreme learning machine --- maximum magnetic entropy change --- gravitational search algorithm --- GaF3 --- CsF-AlF3 flux --- R-Fe-B intermetallics --- cerium --- permanent magnets --- simulation --- magnetic anisotropy constant --- hysteresis loop --- coercive force --- residual magnetization --- X-ray diffraction --- perovskites manganites --- AC magnetic susceptibility --- ZnF2 --- Zn(BF4)2 --- mechanical properties --- MgTiO3 --- geikielite --- high-temperature X-ray diffraction --- sol-gel technique --- thermal expansion --- magnesium–zinc–neodymium master alloy --- Mg–Zn–Nd --- magnesium master alloy --- magnesium --- rare-earth metals --- master alloy synthesis --- metallothermic reduction --- n/a --- magnesium-zinc-neodymium master alloy --- Mg-Zn-Nd --- Engineering --- Technology --- History.

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The energy and fuel industries represent an extensive field for the development and implementation of solutions aimed at improving the technological, environmental, and economic performance of technological cycles. In recent years, the issues of ecology and energy security have become especially important. Energy is firmly connected with all spheres of human economic life but, unfortunately, it also has an extremely negative (often fatal) effect on the environment and public health. Depletion of energy resources, the complexity of their extraction, and transportation are also problems of a global scale. Therefore, it is especially important nowadays to try to take care of nature and think about the resources that are necessary for future generations. For scientific teams in different countries, the development of sustainable and safe technologies for the use of fuels in the energy sector will be a challenge in the coming decades

soaring of fuel droplets --- gas robbing --- shale gas --- syngas --- municipal solid waste --- convection–diffusion equation --- skeletal mechanism --- anionic surfactant --- flow behavior --- enhanced oil recovery --- coal processing waste --- coal consumption forecasting --- energy production --- heating --- disintegration --- hydrate dissociation --- linear drift effect --- injection mode --- aerosol --- gas lift rate --- oil-controlling mode --- decorated polyacrylamide --- supercritical CO2 --- hydraulic fracturing --- closed-form analytical solution --- combustion --- forest fuels --- oil refining waste --- methane --- coal --- two-component droplet --- pore structure --- evaporation --- droplet holder material --- coal-water slurry --- gas lift optimization --- Bunsen burner --- improved gravitational search algorithm --- slurry fuel --- physical properties --- trajectories of fuel droplets --- mechanism reduction --- Mohr–Coulomb theory --- enhanced recovery --- structure evolution --- combustion chamber --- fractured reservoir simulation --- Qikou Sag --- tectonic coal --- explosive breakup --- split factor --- matrix-fracture transmissibility --- waste management --- ignition --- genetic mechanism --- Riedel shear --- biomass --- laser pulse --- dual string completion --- embedded discrete fracture model --- covert fault zone --- waste-derived fuel --- fuel activation --- transport of tracers --- grey relational analysis --- displacement mechanism --- support vector machine --- methane hydrate --- PTV method --- methane desorption --- composite fuel --- water retention in shale --- gas lift --- combustion mechanism --- anthropogenic emission concentration