NUMERICAL METHODS WITH FORTRAN IV CASE STUDIES/
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Subjects / keywords: DORN, WILLIAM S; JOHN WILEY & SONS; 005.133 D713n
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Time-Dilation Methods for Extreme Multiscale Timestepping Problems
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Article
Many astrophysical simulations involve extreme dynamic range of timescales around 'special points' in the domain (e.g. black holes, stars, planets, disks, galaxies, shocks, mixing interfaces), where processes on small sc...
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Open AccessNemesis: A multi-scale, multi-physics algorithm for astrophysics
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Context. Astronomical environments are governed by a complex interplay of physical processes, including gravitational dynamics, radiative transfer, stellar evolution, chemistry, and hydrodynamics. These processes span a ...
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Open AccessApplication of the Newton–Raphson algorithm for enhanced harmonic reduction in seven-level packed U-cell multilevel inverters
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Article
Introduction. Recently, multilevel inverters (MLIs) have been widely investigated for industrial and renewable energy systems as they are valuable in applications where they can produce clean, high-fidelity electrical si...
LCC LCC:Electrical engineering. Electronics. Nuclear engineeringIdioma English
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Material complementarioContinuation-Enhanced Harmonic Balance Method for Nonlinear Dynamics in Rotating Machinery
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Article
Nonlinear response conception in rotating machinery, particularly in systems with squeeze film dampers (SFDs), pose significant challenges for established time-domain numerical methods due to bifurcations and critical po...
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Material complementarioOn the absence of inner horizons for anisotropic black holes
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Article
Abstract We establish a general no-inner horizon theorem for a wide class of static anisotropic black holes in Einstein gravity. Working in an orthonormal frame, we show that anisotropic scaling inevitably induces a non-...
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Material complementarioDEVELOPMENT AND ANALYSIS OF METHODS FOR SOLVING TYPICAL PROBLEMS OF RATIONAL DISTRIBUTION OF LIMITED RESOURCES
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Article
The object of research is the problem of rational distribution of limited resources between subsystems of a complex system that function independently. The relevance of the work is determined by the fundamental features ...
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Open AccessEXPERIMENTAL VISUALIZATION AND NUMERICAL SIMULATION OF FRAUNHOFER DIFFRACTION FROM ORDERED AND DISORDERED OPAQUE MICROSTRUCTURES FOR EDUCATION PRACTICE: ЕКСПЕРИМЕНТАЛЬНА ВІЗУАЛІЗАЦІЯ ТА ЧИСЕЛЬНЕ МОДЕЛЮВАННЯ ДИФРАКЦІЇ ФРАУНГОФЕРА ВІД ВПОРЯДКОВАНИХ І НЕВПОРЯДКОВАНИХ НЕПРОЗОРИХ МІКРОСТРУКТУР ДЛЯ ОСВІТНЬОЇ ПРАКТИКИ
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Article
Formulation of the Problem. In teaching Fraunhofer diffraction, experimental approaches that clearly reveal the relationship between real-space structures and their Fourier-space representation remain limited in accessib...
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Open AccessA numerical and experimental approach to oil recovery performances during combined xanthan gum and carbon dioxide flooding
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Article
Abstract Carbon dioxide enhanced oil recovery (CO2-EOR) offers dual benefits of increasing hydrocarbon production and sequestering anthropogenic CO2; however, conventional CO2 flooding suffers from unfavorable mobility r...
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Open AccessIdentification of Coronal Mass Ejection–Driven Shocks Based on Numerical Simulation and Deep Learning
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Coronal mass ejections (CMEs) are eruptions originating from the solar corona, usually carrying a large amount of fast-flowing plasma into interplanetary space, accompanied by an enhanced magnetic field. CMEs can form sh...
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Open AccessResearch and numerical simulation on dynamic tensile instability evolution mechanism of coal under different impact velocities
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Article
Understanding the strain-damage-energy dissipation mechanisms and evolution characteristics of deep coal and rock under impact loading is of great significance for the prevention and control of rockbursts. In this study,...
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Open AccessA cohort study of fetal urinary tract abnormalities and chromosomal copy number variations: a retrospective analysis of 9-year data
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Abstract Objective To investigate the association between ultrasonically detected fetal urinary system abnormalities and chromosomal copy number variations (CNVs) in Heilongjiang Province, northeastern China. Methods Coh...
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Open AccessA multi-criteria decision model for distribution center location: Pythagorean fuzzy TOPSIS approach
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The selection of distribution center (DC) location is of paramount importance for production systems since an appropriate placement significantly influences transportation costs, delivery lead times, inventory management...
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Material complementarioA new stator flow-oriented control method based on type-2 fuzzy logic controllers for permanent magnet synchronous motors
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Article
Introduction. Stator flow-oriented control is currently the most widely used system in industry or in previous research for improving the quality of mechanical power generated by permanent magnet synchronous motors (PMSM...
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Material complementarioAn energy efficient authentication method for IoT-enabled edge computing using hybrid metaheuristic optimization
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Abstract The emergence of Internet-of-Things devices and expanding data processing demands have led to the popularization of edge computing. But energy efficiency challenges and security problems also remain difficult in...
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Open AccessApplication of chromosomal microarray analysis for fetuses with nasal bone agenesis or hypoplasia
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Abstract Objective To explore the utility of microarray technology in prenatal diagnosis of nasal bone agenesis or hypoplasia. Methods Between July 2018 to October 2023, several cases of abnormal nasal bone development w...
LCC LCC:GeneticsIdioma English
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Open AccessCluster analysis of participants’ self-reported emotional and organizational responses during a large-scale disaster simulation exercise at a level 1 trauma center
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Abstract Background Hospital-based simulations are vital for disaster preparedness. Anxiety and other emotions may affect hospital staff by influencing non-technical skills. We investigated self-reported emotional and or...
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InstitucionalComparative efficacy of vision-restricted vs. conventional cognitive-motor dual-task training for cognition improvement in type 2 diabetes: A randomized controlled trial
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Background: Cognitive disorder is caused by hyperglycemia and insulin resistance in type 2 diabetes. Elevated glycemic levels contribute to neural damage and exacerbate cognitive decline, strict glucose control is requir...
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Open AccessComparison of different criteria for rheumatic heart disease screening: an empirical study in Sierra Leone
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Abstract Background Rheumatic heart disease (RHD) affects approximately 40 million people, primarily in low- and middle-income countries. Transthoracic echocardiography is the gold standard for early detection of RHD. Y...
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Material complementarioCrack propagation and roadway control of fractured rock mass with cut seam blasting
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Article
In underground mining and tunneling projects, directional fracture-controlled blasting is critical for precise tunnel formation and reducing over- and under-excavation. However, the presence of well-developed joints in r...
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Open AccessDetermination of the transition resistance of detachable electrical contacts with Camital active grease
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Problem. The reliability of detachable electrical contact connections is significantly reduced due to an increase in transition electrical resistance caused by thermomechanical deformations, oxidation of contact surfaces...
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Material complementarioDeveloping a Python neural network model for potato yield forecasting with limited data
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Article
This research focuses on developing a neural network model in the Python programming language to solve the technological problem of forecasting potato yields with limited agroclimatic data. The developed program is consi...
LCC LCC:AgricultureIdioma rus
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Open AccessDynamic response characteristics and failure mechanism of coal-rock combination under different immersion conditions
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BackgroundIn practical engineering, the waterproof coal pillar usually suffers from different degrees of dynamic load from the overlying strata, and its internal water distribution is non-uniform. Although the traditiona...
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Material complementarioEffect of bucladesine calcium combined with metoprolol on heart rate variability and cardiac function prognosis in heart failure patients with chronic arrhythmias
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BackgroundHeart failure (HF) with chronic arrhythmias is associated with autonomic dysfunction and poor outcomes. Heart rate variability (HRV) reflects autonomic dysfunction and predicts outcomes in HF. This study invest...
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Open Access