Universitatea Națională de Știință și Tehnologie Politehnica București

Man and the Center of the World: A Short History of the Map

The maps we use today, in navigation apps and on tourist plans of the cities we visit, appear at first sight to be purely utilitarian instruments. This essay argues that the map has never been a neutral representation of the world. From its first appearance it has been a cultural...

Integrated QFD–TRIZ Approach for the Design of a Storage System for Unirradiated Nuclear Fuel Rods

Existing methods for storing and handling unirradiated nuclear fuel are primarily designed for facility-level applications or for transporting unirradiated fuel components and assemblies. In contrast, this study proposes a structured conceptual design approach for a compact stora...

Nonsmooth KKT-type optimality and duality for multiobjective fractional bilevel optimization via tangential subdifferentials

This paper studies a class of nondifferentiable multiobjective fractional bilevel optimization problems. Under suitable nonsmooth constraint qualifications, necessary optimality conditions of the Karush– Kuhn–Tucker (KKT) type are established using tangential subdifferentials. Su...

Numerical Simulation of Flood Inundation Scenarios Along the Bistrița River, Following a Hypothetical Failure of the Bicaz Dam, Romania

Dam failures are low-probability but high-consequence events which require hydraulic modelling studies for hazard assessment. A hypothetical failure of the 127 m Bicaz gravity Dam, Romania, is investigated using a 2D model developed in HEC-RAS along a 115 km reach of Bistrita Riv...

LLM-Assisted Grading for Object-Oriented Programming: A C Dataset and Evaluation Study++

Large language models (LLMs) are increasingly used in programming tasks, including code generation, debugging, validation, optimization, test generation, and educational support. Their use as graders of student programming assignments is, however, still not fully understood, espe...

Resistance-interval training combined with Chlorella vulgaris supplementation modulates PCSK9, ghrelin, adropin, and MANF in obese men: a randomized controlled trial

Obesity disrupts lipid metabolism, appetite regulation, vascular function, and cellular homeostasis through interconnected pathophysiological mechanisms, increasing cardiometabolic disease risk. This randomized controlled trial examined whether 12 weeks of resistance-interval tra...

Cellulose acetate nanocomposite membranes for efficient textile dye removal

Abstract Large-scale dye discharge from the textile industry remains a major environmental concern, with substantial quantities released into wastewater streams each year. In this research, cellulose acetate (CA) nanocomposite membranes incorporating layered double hydroxides (LD...

Comparative Optical Response of DNA-Natural and Synthetic Food Colorant Systems

Biopolymers functionalized with chromophores exhibit interesting optical properties with a high potential for applications in photonics. Quinoline yellow (QY), sunset yellow (SY) and riboflavin (RB) are commonly used as colorants in the food industry, which makes them suitable ca...

Carbon Nano-Onion-Based Sensors for Relative Humidity, Gas, and Temperature Monitoring: A Review

In recent years, carbon nano-onions (CNOs), together with their functionalized derivatives, nanocomposites, and nanohybrids, have attracted increasing attention as sensing materials for monitoring relative humidity (RH), gases, and temperature. Their concentric graphitic structur...

Enhanced Control of 1.5 MW DFIG Generators in MRWT Systems Using GA‐Based PI‐ST‐SMC: Comparative Assessment With ST‐SMC

ABSTRACT This paper proposes a novel genetic algorithm‐based proportional–integral super‐twisting sliding mode control (GA‐PI‐ST‐SMC) strategy for the rotor‐side converter of a 1.5 MW doubly‐fed induction generator (DFIG) operating in marine renewable wind turbine (MRWT) systems....

Gender-Stereotyped Beliefs, Educational Expectations and Occupational Judgements Among Romanian Parents and Teachers: Prevalence and Coherence as Separable Properties

Explicit gender stereotypes are shifting toward neutrality, yet how widely a stereotype is endorsed and how consistently it appears across domains within those who endorse it are separable properties of a stereotype climate. The same Romanian adults, parents alongside teachers an...

Quantum circuit-based learning models: bridging quantum computing and machine learning

Abstract Machine Learning (ML) has been widely applied across numerous domains due to its ability to automatically identify informative patterns from data for various tasks. The availability of large-scale data and advanced computational power enables the development of sophistic...

Behavior of Drinking Water Distribution Pipes Made of HDPE, AC, OLT 37, and OL37.1 in Contact with Water

Drinking water is essential for humans; its quality determines the health and proper functioning of the body. In order to obtain drinking water in accordance with the legislation in force, the performance of the technology applied for water treatment and the infrastructure for tr...

Bioactive Multilayer Poly(ε-caprolactone)–Chitosan Coatings for Spinal Screws

Spinal surgery involves highly complex procedures where the risk of severe complications, including postoperative infections, may compromise both surgical success and patient survival. In this study, functional coatings for spinal screws were developed to promote bone integration...

Effects of Curing Schedules on Carbon-Fiber-Reinforced Laminates with a Bio-Based Epoxy Matrix

Carbon-fiber-reinforced polymer (CFRP) composites fabricated with bio-based epoxy resins represent a promising approach for sustainable lightweight structures produced by out-of-autoclave (OoA) technologies. The curing schedule influences the state of the epoxy matrix and, conseq...

A Study of Constrained Fractional Optimization Problems Involving Interval-Valued Functions

This study explores the optimality criteria for a class of fractional optimization problems characterized by interval-valued objective functions under constraints. These problems involve curvilinear fractional integral cost functionals that are path-independent and fundamentally...

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...