Universitatea Națională de Știință și Tehnologie Politehnica București

Optimal Frequency Control in Isolated Microgrids Integrating Renewable Energy and PHEVs Using a Modified Ziegler–Nichols-Based Multistage PID Controller

Maintaining frequency stability in islanded microgrids (MGs) has become increasingly challenging due to the growing penetration of renewable energy sources, particularly photovoltaic systems, wind turbine generators (WTGs), and plug-in hybrid electric vehicles (PHEVs). The interm...

Influence of Bimodal Pore Architecture on Broadband Acoustic Absorption and Mass Reduction in AlSi Open-Cell Structures

Lightweight materials capable of simultaneously providing noise and mass reduction are increasingly required in aerospace applications. This paper investigates the acoustic performance of a novel hierarchical bimodal architecture in open-cell AlSi porous structures, integrating μ...

Nanotechnology in Pediatric Neurology: Applications and Innovations

Nanotechnology is rapidly transforming the perspective on pediatric neurology, enabling diagnostic, therapeutic, and monitoring strategies tailored to the unique features of neurological illnesses in children. This review acknowledges the problems caused by delays in diagnosis, t...

ON CONTROLLED FRACTIONAL VARIATIONAL INEQUALITIES INVOLVING CONVEX FUNCTIONALS

Abstract This paper explores weak sharp solutions for a controlled variational inequality governed by a convex fractional curvilinear integral functional with path-independent properties. The fractional framework involves derivatives or integrals of non-integer order, which intro...

Artificial Intelligence and the Effective Security of AES: A Narrative Review of Side-Channel Analysis, Encrypted-Traffic Analysis, and the Post-Quantum Positioning of AES-256

This paper provides a narrative review on the role of artificial intelligence in cryptography, with a substantial focus on the Advanced Encryption Standard (AES) and, where the distinction matters, on AES with 256-bit keys (AES-256), at the intersection of cryptanalysis, encrypte...

Static Ground Validation of an AI-Assisted Acoustic Target Detection and Azimuth Estimation Framework on a Flying-Wing VTOL UAV

Autonomous acoustic sensing systems are increasingly investigated for unmanned aerial vehicle (UAV)-based surveillance and environmental monitoring applications due to their passive operation and relatively low computational requirements. However, the integration of acoustic clas...

Pediatric Sleep Staging from Clinical Polysomnography: EEG Channel Relevance, Multimodal Fusion, and Adult-to-Pediatric Transfer

Automatic sleep stage classification has been extensively studied in adults but remains less explored in children because clinical pediatric polysomnography (PSG) datasets are limited and sleep physiology changes throughout development. In this work, we present a clinical pediatr...

Sustainable Corrosion Mitigation Using Aqueous Spent Coffee Grounds Extract: Comparative Performance in Different Acidic Media

This study investigates the efficiency of green corrosion inhibitors derived from spent coffee grounds (SCGs) for OL 37 carbon steel in 0.5 M H2SO4 and 1 M HCl environments. The aqueous extracts, labeled K1 and K2, were obtained through specialized extraction techniques and chara...

Effects of Beetroot-Derived Nitrate Supplementation in Highly Trained and Elite Athletes: A Scoping Review of Randomized Controlled Trials on Performance, Recovery, and Physiological Outcomes

Background: Beetroot-derived nitrate supplementation is a widely studied nutritional strategy to enhance athletic performance. Although ergogenic benefits have been reported in recreational and moderately trained individuals, evidence for highly trained and elite athletes remains...

Enhanced dynamic range spatio-spectral metrology of few-cycle laser pulses

Accurate spatio-temporal and spatio-spectral metrology is critical to the characterization and use of ultra-short, highpower lasers.The emergence of few cycle pulses, with bandwidths of tens or hundreds of nanometers, poses a significant challenge to existing metrology techniques...

Explicit Dynamics Analysis of the Impact Response of Lithium‐Ion Cells

ABSTRACT It is very important to make sure that EV lithium‐ion cells are safe when they are abused, like when they are hit or crushed. This kind of loading can cause structural failure or thermal runaway. Even though FEA is used a lot, common practices make the jellyroll the same...