Wyszukiwarka
Repozytorium Open Access
Filtry
wszystkich: 16963
wyświetlamy 1000 najlepszych wyników Pomoc
Katalog Publikacji
Rok 2025
-
1-ϕ Seven-Level Switched-Capacitor Boost Multilevel Inverter Topology with Optimized Number of Components
PublikacjaIncreasing the voltage of energy sources, such as photovoltaic (PV), fuel cells, and battery storage units, requires a voltage-boosting technique. This paper introduces an efficient switched-capacitor multilevel inverter (SC-MLI) capable of generating a boosted seven-level output voltage. The key advantages of this topology include the inherent self-balancing of capacitor voltages without the need for auxiliary balancing technique....
-
2-D LTCC Van Atta Arrays with Frequency-Domain Encoding for Millimeter Wave Chipless RFID
PublikacjaThe millimeter wave two-dimensional Van Atta arrays, designed for data encoding in chipless RFID systems, are presented in this paper. The arrays, fabricated using LTCC technology, are optimized for the 24 GHz band. Frequency-domain data encoding is achieved using microstrip resonators integrated with the lines of the array feed network, which selectively attenuates signal transmission at frequencies determined by their lengths....
-
3D DEM modelling of acoustic emission in concrete: Insights into elastic waves initiated by microcracks
PublikacjaIn this paper, 3-point bending concrete beams were investigated through a combination of experimental and numerical analyses. Initially, laboratory tests were conducted to observe the formation and propagation of cracks using acoustic emission (AE) and digital image correlation (DIC) techniques. The experimental results obtained were then compared with a numerical study. The widely used discrete element method (DEM), implemented...
-
3D-Printed Boron-Nitrogen Doped Carbon Electrodes for Sustainable Wastewater Treatment via MPECVD
PublikacjaThis study proposes a novel and sustainable method for fabricating 3D-printed carbon-based electrodes for electrochemical wastewater treatment. We prepared B,N-doped carbon electrodes with hierarchical porosity and a significantly enhanced surface area-to-volume ratio (up to 180%) compared to non-optimized analogues using a synergistic combination of 3D printing, phase inversion, and microwave plasma-enhanced chemical vapor deposition....
-
A 3-D-Printing-Oriented Coaxial-Line Filter With Wide Out-of-Band Rejection
PublikacjaIn this letter, a novel design for a 3-D-printed, self-supported coaxial-line X-band filter is presented. The filter is intended for Earth observation (EO) data downlink systems, where it must effectively reject signals in a wide frequency range. The filter design incorporates a 15th-order low-pass filter structure with a smooth profile, integrated with a short bandpass section with four λ/4 short-circuited stubs. The optimization...
-
A 50THz Ultra-Wideband Nano-Photonics Perfect Absorber Biosensor for Label-Free Detection of Circulating Cancer Exosomes: Advancing Early Cancer Diagnostics
PublikacjaThis paper addresses the problem of early-stage cancer diagnosis using microwave imaging (MWI) techniques. Specifically, we focus on detecting circulating exosomes which were recently shown promising as potential biomarkers for cancer detection. Our study introduces an innovative nano-photonic perfect absorbers (NPA) operating in the terahertz (THz) range, offering a promising alternative for the existing MWI-based techniques regarding...
-
A Compact Tri-Band Omnidirectional Antenna Design for CubeSat Applications
PublikacjaThis paper presents a compact tri-band omnidirectional antenna designed for CubeSat applications, operating at UHF (0.755 GHz), L-band (1.25 GHz), and S-band (2.28–3.74 GHz). The antenna features a defected ground structure (DGS) and metallic vias, which enhance impedance matching and enable stable multi-band resonance while maintaining a small footprint of 0.26λ × 0.26λ × 0.013λ within a 1U CubeSat. Unlike conventional CubeSat...
-
A finite strain model for fiber angle plasticity of textile fabrics based on isogeometric shell finite elements
PublikacjaThis work presents a shear elastoplasticity model for textile fabrics within the theoretical framework of anisotropic Kirchhoff–Love shells with bending of embedded fibers proposed by Duong et al. (2023). The plasticity model aims at capturing the rotational inter-ply frictional sliding between fiber families in textile composites undergoing large deformation. Such effects are usually dominant in dry textile fabrics such as woven...
-
A flying start method for sensorless induction machine-based electric drives
PublikacjaThis paper presents an analysis of a proposed flying start method for sensorless electric drives based on an induction machine. The method introduces two stages. In the first stage, the rotor speed is estimated using the step response of the machine, which enables coarse estimation of the speed and direction of rotation, helping to reduce the initial slip. The second stage introduces an intermediate control system to facilitate...
-
A Miniaturized and High Optically Transparent Frequency Selective Surface for RF Shielding using Double-Glazed Glass Windows for Green Building Applications
PublikacjaThis research presents a miniaturized and high optically transparent (OT) frequency selective surface (FSS) for achieving RF shielding through glass window panels. The proposed FSS consists of a single-layered copper pattern sandwiched between two ordinary glass substrates to suppress the dual bands of sub-6 fifth generation (5G). In particular, the design effectively shields n65-downlink (2.1 GHz) and a portion of n78-band (3.5...
-
A Multi-Receiver GNSS System Geometry Control Algorithm in Mobile Measurement of Railway Track Axis Position
PublikacjaAccurate diagnostics of the railway track axis are crucial for enabling higher operational speeds of rail vehicles. Consequently, assessment methods are under continuous refinement. The precision of mobile GNSS-based measurements is influenced by external factors such as terrain obstructions and satellite geometry. This study presents an innovative approach that continuously monitors a predefined multi-receiver GNSS configuration...
-
A Non-PCM-Based 2 × 2 MIMO Antenna Array With Low Radar Cross-Section Using Characteristic Mode Analysis
PublikacjaIn this paper, we introduced a 2×2 multiple-input-multiple-output (MIMO) antenna array using a non-polarization conversion metasurface (NPCM) with reduced radar cross section (RCS). To achieve a low RCS, a chess-board configuration is typically adopted. However, in conventional NPCM designs, subarrays with 180◦ phase shifts apart exhibit radiating modes at different resonance frequencies due to varied unit cell sizes and spacing....
-
A Note on Bifurcation of Equilibrium Forms of a Gas Balloon Parachute
PublikacjaWe will be concerned with deformations of a free elastic top rim of a parachute of a gas balloon. The top rim is connected with the circular deflation port of the balloon envelope by heavy duty flexible load tapes. The inside part of the balloon is filled with compressed gas. Equilibrium forms of the parachute may be found as solutions of a certain nonlinear functional-differential equation with two physical parameters: an elasticity...
-
A procedure for simulation-assisted identification of ultrasonic wave attenuation in heterogeneous materials and its application to the detection of fracture in concrete beams
PublikacjaIn this study, a novel procedure for identification of ultrasonic wave attenuation in heterogeneous materials based on signal energy was presented. The main objective was to develop a method for simple and robust determination of wave characteristics for further use in numerical modelling of ultrasonic wave propagation including attenuation of signals. Experimental investigations supported by numerical simulations were proposed...
-
A Review: Structural Shape and Stress Control Techniques and their Applications
PublikacjaThis review article presents prior studies on controlling shape and stress in flexible structures. The study offers a comprehensive survey of literature concerning the adjustment and regulation of shape, stress, or both in structures and emphasizes such control’s importance. The control of systems is classified into three primary classes: nodal movement control, axial force control, and controlling the two classes concurrently....
-
A Wideband Rotary Antenna Based on Gap Wavegudie Technology for mmWave Applications
PublikacjaThis study introduces the design of a gap waveguide-based rotary antenna capable of 360° mechanical beam-steering for wideband mmWave applications. This innovative design overcomes the typical limitations of electronically steerable antennas, such as narrow bandwidth, restricted steering range, gain reduction, and high cost and complexity. The designed rotary antenna achieves a gain of 13.8 dBi without any scan loss across the...
-
Activation of small molecules by ambiphilic NHC-stabilized phosphinoborenium cation: formation of boreniums with B–O–C, B–O–B, and B–O–P structural motifs
PublikacjaThe reactivity of the phosphinoborenium cation supported by a 1,3,4,5-tetramethylimidazolin-2-ylidene ligand toward small molecules was explored. The phosphinoborenium cation exhibited dual Lewis acid–base properties due to the presence of the Lewis acidic boron center and the Lewis basic phosphido ligand connected by a covalent bond. The reaction of the title cation with CO2 led to the insertion of a CO2 molecule into the P–B...
-
Active learning on stacked machine learning techniques for predicting compressive strength of alkali-activated ultra-high-performance concrete
PublikacjaConventional ultra-high performance concrete (UHPC) has excellent development potential. However, a significant quantity of CO2 is produced throughout the cement-making process, which is in contrary to the current worldwide trend of lowering emissions and conserving energy, thus restricting the further advancement of UHPC. Considering climate change and sustainability concerns, cementless, eco-friendly, alkali-activated UHPC (AA-UHPC)...
-
Advancing AI Adoption in the Public Sector
PublikacjaGovernments are increasingly adopting AI to improve public services as part of smart city development, and hybrid intelligence plays an essential role in this developmental process. This panel, emphasizing stakeholder perspectives, explores the opportunities and challenges of adopting hybrid intelligence for smart city development. We include three papers and six authors for the panel. The first paper investigates how smart city...
-
Agile Mindset, Technological vs. Non-technological Mindset, and Gender. Are They Related?
PublikacjaThis study examined the impact of gender on the relationship between employees' agile and non-agile mindsets and organisational agility. It also considers the tech and non-tech focus as a potential moderator. The initial sample of 209 knowledge workers andthe replication sampleof 401 knowledge workers were applied to analyse the above relations using OLS regression by SPSS PROCES. The results showed that the most critical factor...
-
AI-enabled co-creation for evidence-based policymaking: A conceptual model
PublikacjaThis study focuses on developing and validating the key parameters of Artificial Intelligence (AI) -enabled co-creation integrated into evidence-based policymaking. We critically analyzed prior research to ensure a participatory, data-driven, and iterative policymaking process. We identified essential parameters shaping AI-enabled co-creation processes in public sector organizations (PSOs), including...
-
An analogue of the Pöschl–Teller anharmonic oscillator on an N-dimensional sphere
PublikacjaA Schr{\"o}dinger particle on an $N$-dimensional ($N\geqslant2$) hypersphere of radius $R$ is considered. The particle is subjected to the action of a force characterized by the potential $V(\theta)=2m\omega_{1}^{2}R^{2}\tan^{2}(\theta/2) +2m\omega_{2}^{2}R^{2}\cot^{2}(\theta/2)$, where $0\leqslant\theta\leqslant\pi$ is the hyperlatitude angular coordinate. In the general case when $\omega_{1}\neq\omega_{2}$, this is a model of...
-
An objective isogeometric mixed finite element formulation for nonlinear elastodynamic beams with incompatible warping strains
PublikacjaWe present a stable mixed isogeometric finite element formulation for geometrically and materially nonlinear beams in transient elastodynamics, where a Cosserat beam formulation with extensible directors is used. The extensible directors yield a linear configuration space incorporating constant in-plane cross-sectional strains. Higher-order (incompatible) strains are introduced to correct stiffness, whose additional degrees of...
-
An Updated Lagrangian framework for large deformation analysis of thin elastomeric materials
PublikacjaElastomeric materials are widely used in several engineering disciplines. Due to importance of these materials in vast variety of industries, in this paper, a nonlinear finite element formula for large deformation analysis of hyperelastic elastomeric materials is developed. Both Total Lagrangian (TL) and Updated Lagrangian (UL) frameworks are adopted for developing the FE relations. Firstly, the Total Lagrangian formulation is...
-
ANALIZA REGULACJI PRAWNYCH DOTYCZĄCYCH OSÓB NEURORÓŻNORODNYCH NA RYNKU PRACY
PublikacjaWedług szacunków neuroróżnorodność, rozumiana jako naturalne zjawisko charakteryzujące się różnorodnością w ludzkim poznaniu, dotyczy około 15–20% ludzi. Do tej pory jednak, w kontekście inkluzji różnorodności poświęcano tej problematyce znacznie mniej uwagi niż innym, takim jak np.: płeć, wiek czy wyznanie. W rezultacie, stosunkowo niewielka liczba organizacji otwarta jest na inkluzję neuroróżnorodności i wykorzystanie wynikających...
-
Analysis of Key Material Parameters of Evaporator Wicks and Working Fluids for a Loop Heat Pipe Operating in the Temperature Range of 500–700 K
PublikacjaThis study presents a preliminary evaluation of candidate wick material and working fluid for a flat-loop heat pipe (F-LHP) designed to operate within the temperature range of 500–700 K. The selection process considered key thermal and physical parameters, including thermal conductivity, chemical compatibility between wick and fluid, capillary pressure generation, pressure drop across the wick structure, and structural integrity...
-
Analysis of the Possibility of Using Exhaust Gas Composition in the Diagnosis of a Diesel Engine
PublikacjaThe article analyzes the impact of malfunctions in compression-ignition engine systems on exhaust composition and cycle parameters. A naturally aspirated, single-cylinder, four-stroke Farymann Diesel D10 engine was studied, with simulated common failures.The research included laboratory experiments and computer simulations using DIESEL-RK, a tool for optimizing engine processes and thermodynamic cycles.Malfunctions...
-
Analysis of the possibility of using the Sankey diagram in the diagnosis of a partially loaded diesel engine
PublikacjaThe purpose of this article is to determine if, in the case of inability to carry out diagnostic tests at engine operating loads in the range of 70÷90%, engine functional systems can generate diagnostic signals in the form of changes in heat balance components. The motivation for working on the selected topic was the need to evaluate the effectiveness of graphical forms of heat balance representation, especially Sankey diagrams,...
-
Anonymous provision of privacy-sensitive services using blockchain and decentralised storage
PublikacjaLawyers, laboratories, auditors, and banks often need access to sensitive personal data to provide services such as genetic testing, paternity testing, STD testing, credit scoring, or legal advice. Processing such data exposes both service providers (SPs) and users to privacy risks: SPs risk violating laws like the General Data Protection Regulation (GDPR) and the Consumer Protection Act (CPA), while users risk losing their privacy....
-
Anterior prefrontal EEG theta activities indicate memory and executive functions in epilepsy patients
PublikacjaObjective: Cognitive deficits are one of the most debilitating comorbidities in epilepsy and other neurodegenerative, neuropsychiatric, and neurodevelopmental brain disorders. Current diagnostic and therapeutic options are limited and lack objective measures of the underlying neural activities. In this study, electrophysiological biomarkers that reflect cognitive functions in clinically validated batteries were determined to aid...
-
Anticancer drugs targeting topoisomerase II for antifungal treatment
PublikacjaFungal topoisomerase II (TopoII) has been identified as essential for viability. Thus, our research aimed to investigate the potential of fungal TopoII as a novel target for antifungal chemotherapy. We conducted studies on eleventh antitumor compounds targeting human topoisomerase II, either approved by the U.S. Food and Drug Administration (FDA) or currently under clinical trials to evaluate their potential for use in other therapeutic...
-
Application of 3D scanning and computer simulation techniques to assess the shape accuracy of welded components
PublikacjaWhile traditional measurement methods prove to be insufficient when facing more complex shapes and intricate challenges, increasingly efficient solutions are emerging in their place. 3D scanners in particular exhibit versatility. They clearly represent a useful tool in many fields with diverse requirements; thus, it is advisable to explore further areas of their potential applications, e.g., in quality control or reverse engineering....
-
Application of materials science in the investigations of power cable damage
Publikacjahe article describes the application of confocal microscopy and Raman spectroscopy in the diagnostics of high-voltage power cables. This issue is presented on the example of a failure that occurred during the start-up of a 110 kV cable line. Positive results of tests conducted by the cable manufacturer and during line acceptance indicated good cable insulation parameters. Material tests excluded the presence of hidden cable defects....
-
Application of UV-VIS Spectroscopy and Machine Learning Methods in Glucosuria Diagnostics: A Phantom Study
PublikacjaIn this study, UV-VIS spectroscopy was used as a tool for detecting low glucose concentrations in urine. Measurements were performed on artificial urine samples and solutions with 0.1% and 0.2% glucose, covering both normal and pathological thresholds. Among the evaluated models, Random Forest reached 0.887for the 0.1% glucose sample, while Logistic Regression achieved 0.7796 for the 0.2% glucose sample,...
-
Artificial Intelligence for Wireless Communications: the InSecTT perspective
PublikacjaThis paper presents an overview of how Artificial Intelligence (AI) and edge technology have been used to improve wireless connectivity in multiple industrial Use Cases (UCs) of the EU project “Intelligent Secure Trustable Things” (InSecTT). We present a brief introduction of the InSecTT framework for crossdomain architecture design, which targets UCs assisted by reusable and/or interoperable technical Building Blocks (BBs). These...
-
Assessing the availability and interoperability of open government data (OGD) supporting sustainable development goals (SDGs) and value creation in the gulf cooperation council (GCC)
PublikacjaValue creation and innovation by a range of stakeholders, including citizens, analysts, journalists, non-profit entities, etc. are the hallmarks of Open Government Data (OGD) initiatives. At the same time, availability and interoperability of datasets are determined as two of the most important factors for value creation. In parallel, the United Nations’ Sustainable Development Goals (SDGs) are meant to be realized to attain quality...
-
ASSESSMENT OF THE GREENNESS OF MOLECULARLY IMPRINTED POLYMERS USED IN SAMPLE PREPARATION
PublikacjaIt is now widely accepted that the incorporation of molecularly imprinted polymers (MIPs) into sample preparation techniques has enabled unprecedented selectivity performance of analytical methods for the determination of a wide range of analytes in biological, food and environmental samples. However, according to the Principles of Green Chemistry and the subsequent Principles of Green Sample Preparation, it is clear that MIPs...
-
“At Home with My Sausage Dog”: Extending the Job Demands-Resources Model to Autistic Employees Working Flexibly
PublikacjaIntroduction: In recent decades, digital transformation and digital technologies have increasingly enabled flexible working arrangements. Internationally, the COVID-19 pandemic contributed significantly to a surge in flexible working arrangements. Paralleling these changes in the nature of work, the momentum of neurodiversity initiatives has resulted in more organizations recognizing the benefits of recruiting neurodivergent talents,...
-
Automatic Cleaning of Time Series Data in Rural Internet of Things Ecosystems That Use Nomadic Gateways
PublikacjaA serious limitation to the deployment of IoT solutions in rural areas may be the lack of available telecommunications infrastructure enabling the continuous collection of measurement data. A nomadic computing system, using a UAV carrying an on-board gateway, can handle this; it leads, however, to a number of technical challenges. One is the intermittent collection of data from ground sensors governed by weather conditions for...
-
Badanie działania zabezpieczeń różnicowoprądowych typu RDC-DD przy wybranych przebiegach prądu różnicowego
PublikacjaW instalacjach niskiego napięcia przeznaczonych do ładowania pojazdów elektrycznych obowiązkowe jest stosowanie zabezpieczeń różnicowoprądowych. W instalacjach tych istnieje jednak ryzyko pojawienia się w prądzie ziemnozwarciowym stosunkowo dużej wartości składowej stałej, która negatywnie wpływa na próg zadziałania powszechnie instalowanych wyłączników różnicowoprądowych. Konieczny jest więc dobór zabezpieczenia zdolnego do wykrywania...
-
Bentonite nanoclay and spray techniques as a nano pico technology (NPT) for enhancing mortar in heritage and historical buildings
PublikacjaThe inventive idea of using Bentonite Nano-Clay spray as a Nano-Pico Spray (NPS) technique is an effective solution to the problem of erosion of historical brick monuments. This research focuses on protecting and restoring brick structures using bentonite nanoparticles as a Nano Soil Improvement (NSI) technique minimally invasive Nano-Spray to enhance mortar durability. By applying a protective Nano-Clay coating as a Green and...
-
BEZPIECZEŃSTWO DZIECI W CYBERPRZESTRZENI KLUCZOWE ZAGADNIENIA I PRZEPISY PRAWNE
PublikacjaBezpieczeństwo dzieci w cyberprzestrzeni kluczowe zagadnienia i przepisy prawneOpracowanie eksperckie Marcin Niedopytalski W dobie powszechnej cyfryzacji, kiedy dostęp do internetu stał się nieodłącznym elementem życia codziennego, kwestia bezpieczeństwa dzieci w sieci nabiera szczególnego znaczenia. Z jednej strony obserwujemy korzyści płynące z edukacji online, swobodnego dostępu do informacji...
-
Biomechanical analysis of upper limb of patients with Duchenne muscular dystrophy in chosen functional tasks: A multi-case study
PublikacjaBackground The main symptom of Duchenne muscular dystrophy is progressive wasting of muscle tissue. Current research on motor measurements for these patients lacks assessments of the whole trajectories of the functional motions over time in clinical conditions. The main goal of this study was to compare the upper limb movement strategy of patients with Duchenne muscular dystrophy and a healthy Control by assessing the contributions...
-
Bistability and chaos in the discrete two-gene Andrecut-Kauffman model
PublikacjaWe conduct numerical analysis of the 2-dimensional discrete-time gene expression model originally introduced by Andrecut and Kauffman (Phys. Lett. A 367: 281–287, 2007). In contrast to the previous studies, we analyze the dynamics with different reaction rates α1 and α2 for each of the two genes under consideration. We explore bifurcation diagrams for the model with α1 varying in a wide range and α2 fixed. We detect chaotic dynamics...
-
Boosting the radical-induced reductive degradation of clofibric acid in water: Synergistic effect of SO32−/UV and hydrodynamic cavitation (HC)
PublikacjaAdvanced reduction processes (ARPs) of SO32−/UV were combined with hydrodynamic cavitation (HC) for the first time to attempt a reductive degradation of clofibric acid (CLA) in water. At cavitation number (Cv) 0.2, rred 3.25, pH 6.5, the combined HC/SO32−/UV degraded 99.68 % of CLA in 90 min resulting in a synergistic effect of 1.42. Quenching experiments on SO32−/UV and HC/SO32−/UV revealed that HC promoted the formation of H•...
-
Born Twice: The Role of Social Media in Identity Redefinition after Sudden Disability
PublikacjaFrom being attacked by a shark to being stricken by illness, people who acquire disabilities later in life have unique lived experiences. There is, however, a commonality that binds them: the loss of a former identity and a rebirth into another life. They may also struggle with self-acceptance as they shun societal stigmas and perceived deviance from cultural norms. Through a netnographic study, we examine how identities are redefined...
-
Burnout, work-related daily negative affect and rumination: a mediation model combining an intensive and longitudinal design
PublikacjaObjective. The study aims to examine the relationship between daily negative affect and rumination in the context of work and to verify their mediating roles in the process of burnout. Design. A classic longitudinal design with two measurement points for burnout was combined with 10 daily online assessments of negative affect and rumination among 235 civil servants. Results. A random intercept cross-lagged panel model was implemented....
-
Calculations of Cross-Sections for Positron Scattering on Benzene
PublikacjaIn this work, we present a theoretical study on positron scattering by benzene molecules over a broad energy range (1–1000 eV). The aim of this work is to provide missing data from partial cross-sections for specific processes. In particular, calculations of cross-sections for direct ionization and electronic excitation were carried out for benzene molecules in the gas phase. An estimate for the cross-section for positronium formation...
-
Characteristics Mode Analysis and Excitation of Orthogonal Modes on a Single Substrate for Wideband IoT Applications in the Millimeter Wave Band
PublikacjaThis paper presents the design of a circularly polarized millimeter-wave (mm-wave) metasurface (MTS) antenna. The Characteristics Modes Analysis (CMA) is employed to examine various modes within the unit-cell design of the proposed metasurface. Based on a thorough analysis, two orthogonal TM modes with a broadside radiation pattern were identified. These modes were then simultaneously excited on a single substrate using simple...
-
Charging points in underground garages of multi-family buildings in Poland current status, challenges and development prospects
Publikacjahe article describes key aspects of the development of electric vehicle charging points in underground garages of multi-family buildings in Poland. It presents an analysis of current legal regulations. In legal matters, in addition to presenting the necessary steps, we recommend contacting a lawyer. We also present the results of load measurements of EV charging points