A disaster-type event manifested by an earthquake at a dam and high power hydropower plant, has very low manifestation likelihood, but the gravity can be catastrophic with powerful impact over flood of area followed human lives loss, changing altering environment hence losing facility producing electricity. Such bring extreme damage for population, society state involved infrastructures, generating prejudice energetic national security. For this reason, authors have simulated 8 magnitude on...

In the current context of sustainability management and energy insecurity, amplified by military instability determined war between Russia Ukraine, increasingly frequent occurrence a series plausible scenarios for disasters or blackouts worldwide, this work is real applicable model regional states that would like to critically analyze situation their security through identifying all risk targeting critical infrastructures. The study has identified assessed two most (a natural disaster...

Polyurethane foam (PF) is a versatile polymer widely used in various applications. By changing the composition of polyol and isocyanate, these foams can be classified into rigid polyurethane (PUFRs) flexible (PUFFs). The (PUFFs) well known for its sound absorption capacities; nevertheless, flammability poses significant safety hazards. purpose this study to look how reacts fire, specifically combustion properties, risks that come with them. aims find out rates horizontal vertical burning,...

Air quality is an essential factor for human health and ecosystem balance, but in regions like Petroșani Mountain Depression, air pollution continues to be a significant challenge. This area, marked by decades of coal mining, confronted with high concentrations pollutants, influenced activities the specific geography climate. study aims compare instrumental measurements snow sample analysis, as sustainable alternative method. Specifically, it examines spatiotemporal distribution evolution...

In this research, we present the development and validation of a compact, resource-efficient (low-cost, low-energy), distributed, real-time traffic air quality monitoring system. Deployed since November 2023 in small town that relies on burning various fuels waste for winter heating, system comprises three IoT units integrate image processing environmental sensing sustainable urban management. Each unit uses an embedded camera sensors to process live data locally, which are then transmitted...

The desire to reduce pollution and price instability generated by the major share of fossil fuel use requires firm solutions for green transition economy, that must provide access clean, safe affordable energy. An important sector, seriously affected, being a competitive field with consistent limitations, is transport system, where alternative fuels, hydrogen, perhaps solution. Hydrogen can be used as raw material, fuel, stored many other possible uses in industry sectors, not only...

Abstract Algebraic reconstruction techniques (ARTs), on both their successive and simultaneous formulations, have been developed since the early 1970s as efficient ‘row-action methods’ for solving image-reconstruction problem in computerized tomography. In this respect, two important development directions were concerned with, first, extension to inconsistent case of and, second, combination with constraining strategies, imposed by particularities reconstructed image. first part paper, we...

Methane is one of the most common gaseous fuels that also exist in nature as main part natural gas, flammable biogas or reaction products from biomass pyrolysis. In this respect, and installations are always subjected to explosion hazards due methane. Simple methods for evaluating great importance, at least preliminary stage. The paper describes such a method based on an elementary analysis cubic law pressure rise during early stages flame propagation symmetrical cylindrical vessel small...

In this paper we consider the numerical solution of first-order Hamilton–Jacobi equations using combination a discontinuous Galerkin finite element method and an adaptive r-refinement (mesh movement) strategy. Particular attention is given to choice appropriate adaptivity criterion when becomes discontinuous. Numerical examples in one two dimensions are presented demonstrate effectiveness procedure.

The splitting method used in a previous study for the numerical solution of mass transfer equations ternary systems is generalized to mixtures with n-components. diffusion coefficients are considered constant. Theoretical results about stability presented, as well simulations n = 4, 5, and 6. experiments confirmed theoretical show good performances. Moreover, multicomponent effects without an imposed concentration gradient investigated 6 components.

This work continues our previous analysis concerning the performances of nonlinear multigrid (the Full Approximation Storage algorithm) method and modified Picard preconditioned conjugate gradient methods for numerical solution two-dimensional, steady-state, multicomponent mass transfer equations. The present test problems are linear nonlinear, convection-diffusion-reaction upwind finite difference was used to discretize mathematical model results obtained show good performances.

Abstract In an earlier paper [J. of Appl. Math. and Informatics, 29(3-4)(2011), 697-712] we proposed a general projection-type algorithm with corrections proved its convergence under set special assumptions. this prove much weaker This new framework gives us the possibility to obtain as particular case our method two-step analysed in [B I T, 38(2)(1998), 275-282].

Humanity is a fossil-fueled civilization with large influence on the environment. The World Health Organization (WHO) has pointed out that air pollution now single biggest environmental threat to human health. quality in Petroșani, traditional mining region from Jiu Valley bituminous coal basin, Romania, rarely debated; however, it not often investigated. In this paper, main sources of Petroșani are identified and performed measurements emphasize area its transit road. monitoring program set...

We present in this paper two versions of a general correction procedure applied to classical linear iterative method. This gives us the possibility, under certain assumptions, obtain an extension it inconsistent least-squares problems. prove that some well known extended projection type algorithms from image reconstruction computerized tomography fit into one or other these and are derived as particular cases them. also numerical experiments on phantoms widely used literature. The show...

In a series of two papers, we analyze the numerical performances preconditioned conjugate gradient algorithms (BICGSTAB and GMRES) multigrid method in solving two-dimensional multicomponent mass transfer equations. The present test problems are steady-state, linear nonlinear diffusion-reaction algorithm used connection with methods is modified Picard iteration. Theoretical results about preconditioning presented. Full Approximation Storage algorithm. finite difference was to discretize...

The object of the evaluation risk factors that may lead to accidental initiation semi-finished products containing pyrotechnic articles in process handling / use storage transport is represented by estimation and assessment detonation devices, based on quantification dangers specific operations with these types products, carried out various phases technological flow, used manufacture electrical circuit breakage subassemblies motor vehicles. Protection against due particular interest safety...

The Growing concern about climate change and the actions that need to be taken protect environment have begun occupy top places on global agenda in recent years. Transport of future will look different: ecological, economic maximum efficiency. But it's not only car manufacturers who are making efforts reduce as much possible impact vehicles. One solutions is major interest using hydrogen a viable answer for decarbonizing industrial processes sectors where carbon reduction both urgent...

The execution of the blasting works involves management problem storage explosive materials. This aspect is easier to solve in case mines activities with long exploitation time and where capacities are arranged, according legislation that provides constructive safety criteria depending on type quantity materials stored. In isolated works, those for road construction, building demolition, underwater or forestry, etc., facilities must be arranged shorter periods smaller capacity, but which...

Rising prices and the desire to reduce pollution by replacing traditional fuels (benzine diesel) in transport system require solutions make this sector more economically efficient. The use of LPG, CNG H2 implies, from point view explosion risks, additional features compared conventional filling stations increase safety environmental protection. Thus, paper presents effects caused each fuel analysed (LPG, H 2 ), worst case, initiation case. analysis performed is based on simulation using...

3D representations using assisted design and computer simulations allow determining the geometric characteristics of critical sections needed for analytical calculation. Also, these form basis meshing necessary finite element The purpose this paper is to perform metal structure verification, both by classical calculation method, as well validate calculations computerized simulation. performed on metallic involves determination stresses and, implicitly, safety coefficients, which constitute a...