Structure analysis in an octocopter using piezoelectric sensors and machine learning.

This study presents a novel diagnostic methodology for assessing drive system damage and its propagation in an unmanned aerial vehicle (UAV) using piezoelectric sensors mounted on each arm of the drone. In contrast to existing studies that focus solely on fault localization, this work investigates the spatial propagation of structural responses to localized motor faults under varying operating conditions. By varying the PWM control signal duty cycle on one motor, different degrees of damage (from 20% to 80%) were simulated.

New Biodegradable Polyester-Polyurethane Biocompositions Enriched by Urea.

Novel polyester-polyurethane polymeric materials were formulated by combining a natural aliphatic polyester, poly(3-hydroxybutyrate) (P3HB), with a synthetic aliphatic polyurethane via melt blending. The resulting fully biodegradable compositions were functionally modified through the incorporation of urea, with the aim of enabling post-consumer utilization of the material residues as nitrogen-rich fertilizers. The fabrication process was systematically established and optimized, focusing on homogeneous blending and processability.

Comprehensive Analysis of Cutting-Force Components in Milling Using RQA: Effect of Edge Geometry and Process Parameters.

This study investigates the influence of cutting edge geometry (continuous, serrated, and wavy) and selected machining parameters (cutting speed , feed per tooth , and radial infeed ) on cutting-force components and dynamic behavior during the milling of an AlZn5.5MgCu aluminum alloy. The analysis was based on box plots and Recurrence Quantification Analysis (RQA) applied to the cutting-force signal.

Optimization of Tribological Properties of Shot-Peened Surfaces via Multi-Criteria Decision-Making Using TOPSIS and GRA.

The article presents a comparative analysis of experimental results from tribological tests conducted using a ball-on-disc system, applying two multi-criteria decision-making methods: Grey Relational Analysis (GRA) and TOPSIS (Technique for Order Preference by Similarity to Ideal Solution). The aim of the study was to identify the most advantageous combinations of input parameters-load, sliding speed, and sliding distance-while simultaneously evaluating three output criteria: volumetric wear (VD), coefficient of friction (CoF), and weight loss (WL). The analysis covered 27 test variants, with different weighting factors assigned to each criterion to reflect their practical significance (0.

Bioactive Properties of Selected European Species: A Comprehensive Study.

This study conducted a multi-directional evaluation of the chemical potential and biological properties of selected European fungal species of the genus . We investigated 30 samples belonging to 22 species. Fruiting bodies were collected, among other specimens, in the Białowieża Forest (Poland); Village Kozhle (North Macedonia); Estremadura, Sesimbra, and Lagoa de Albufeira (Portugal); Zlatari close to Prishtina (Kosovo); and Spoleto and the Bosco Siro Negri State Nature Reserve (Italy).

Coupled Bone-Muscle Degeneration in Chronic Pancreatitis: A Juvenile Porcine Model of Secondary Osteosarcopenia.

Osteosarcopenia, characterized by concurrent bone loss and muscle wasting, significantly impacts mobility and quality of life. While age-related primary osteosarcopenia is well-studied, secondary osteosarcopenia (SOS) caused by chronic diseases remains poorly understood, particularly in young individuals. The present study aimed to comprehensively characterize musculoskeletal alterations associated with SOS using a juvenile porcine model of cerulein-induced chronic pancreatitis.

Trace Elements-Role in Joint Function and Impact on Joint Diseases.

Proper joint function has a significant impact on people's quality of life. Joints are the point of connection between two or more bones and consist of at least three elements: joint surfaces, the joint capsule, and the joint cavity. Joint diseases are a serious social problem.

Testing Using the DCP Probe of a Subgrade Modeled from Difficult-to-Compact Sand in a Calibration Chamber.

The aim of the article is to analyze the possibilities of using a lightweight dynamic cone probe DCP to determine the quality of compaction of surface layers of embankments (from 0.10 m to approx. 0.

Effect of Hole Diameter on Failure Load and Deformation Modes in Axially Compressed CFRP Laminates.

This study presents a detailed analysis of the influence of hole presence and size on the behavior of CFRP composite plates subjected to axial compression. The plates were manufactured by an autoclave method from eight-ply laminate in a symmetrical fiber arrangement [45°/-45°/90°/0°/90°/-45°/45°]. Four central hole plates of 0 mm (reference), 2 mm, 4 mm, and 8 mm in diameter were analyzed.

Exploring mechanisms underlying the beneficial effect of whey protein isolate on the biocompatibility of the thermally obtained curdlan-based hydrogel.

This work aimed to compare the biomedical potential of thermally obtained hydrogels consisting of curdlan and a curdlan-whey protein isolate mixture. The purpose of this paper was also to investigate and explain the mechanisms responsible for their different cyto- and biocompatibility. To do this, mechanical and structural properties, wettability, and protein adsorption of biomaterials were analysed and compared.

A Novel Parametrical Approach to the Ribbed Element Slicing Process in Robotic Additive Manufacturing.

Additive manufacturing is one of the most common technologies used in prototyping and manufacturing usable parts. Currently, industrial robots are also increasingly being used to carry out this process. This is due to a robot's capability to fabricate components with structural configurations that are unattainable using conventional 3D printers.

Investigation of Buckling and Failure in Thin-Walled Columns Fabricated from PLA and PETG Using FDM 3D Printing.

This paper presents the results of an experimental study on the buckling and failure behavior of thin-walled square columns made from PLA and PETG polymers using FDM 3D printing technology. Thin-walled square columns made from thermoplastic materials, intended for use in lightweight load-bearing applications such as structural supports in transportation, construction, and mechanical assemblies, were tested under axial compression from the onset of buckling to complete failure. The novelty of this work lies in the application of an interdisciplinary experimental approach to the analysis of the behavior of thin-walled columns made of PLA and PETG materials during FDM 3D printing under compression until complete failure, as well as the use of acoustic and optical diagnostic methods for a comprehensive assessment of damage.

Effect of Ti Doping of AlCoCrFeNi-Based High Entropy Alloys on Their Erosion Resistance by Solid Particles.

The erosion resistance of materials against solid particles is a very important property, especially in the transportation of powders or in aeronautics (dust inside jet engines). There is a strong need to introduce new materials that have higher solid particle erosion resistance than state-of-the-art materials. Thus, in the present work, the solid erosion particles of high entropy alloys (HEAs) based on the Al0.

Numerical Investigation of Buckling Behavior of MWCNT-Reinforced Composite Plates.

The current study demonstrates the buckling properties of composite laminates reinforced with MWCNT fillers using a novel higher-order shear and normal deformation theory (HSNDT), which considers the effect of thickness in its mathematical formulation. The hybrid HSNDT combines polynomial and hyperbolic functions that ensure the parabolic shear stress profile and zero shear stress boundary condition at the upper and lower surface of the plate, hence removing the need for a shear correction factor. The plate is made up of carbon fiber bounded together with polymer resin matrix reinforced with MWCNT fibers.

Analysis of Fatigue and Residual Strength Estimation of Polymer Matrix Composites Using the Theory of the Markov Chain Method.

This paper deals with an important issue, which is the influence of failure caused by the quality of matrix post-curing on the strength of complex and difficult materials of the "new generation" such as fibre composites, particularly with a polymer matrix. In recent years, significant advances in the field of adhesive materials chemistry have led to the constant development of bonding technology. The effectiveness of bonding depends, to a large extent, on the suitable selection of the adhesive and the use of appropriate surface treatment technology.

Mechanical Properties and Functional Assessment of PMMA Bone Cements Modified with Glassy Carbon.

Poly(methyl methacrylate) (PMMA)-based bone cements are widely used in orthopaedic surgery, yet their inherent brittleness, lack of bioactivity, and exothermic polymerization remain critical limitations. Recent strategies have focused on modifying PMMA with functional additives to improve not only mechanical performance but also thermal behaviour and biological interactions. This study investigates the mechanical properties of two commercial PMMA cements-Palamed (antibiotic-free) and Refobacin Plus G (gentamicin-loaded)-reinforced with glassy carbon (GC) particles of two different grain sizes (0.

The effects of ethanol sclerotherapy on pain and quality of life in patients with endometrial cysts.

Objectives: Endometriosis is a prevalent chronic gynecological condition resulting in infertility, and severe pain that strongly deteriorates patients' quality of life. In addition to surgery and pharmacotherapy, there are also other methods of endometriosis management, such as sclerotherapy, which is used in patients with endometrial cysts. So far, there is a shortage of knowledge regarding sclerotherapy's influence on pain symptoms and quality of life.

Unveiling key drivers of green operational efficiency.

Background: Rooted in centuries of tradition and closely linked to the local area, the wine industry has enjoyed great social and cultural recognition for centuries. However, in recent times, it has been facing increasing environmental pressures and changing market expectations, forcing wineries to rethink their practices to reduce the negative impact of their activity on the natural environment. In this context, the role of responsible leadership in promoting sustainability has become crucial, considering the current ecological challenges and the increasing pressure on businesses to focus on both environmental and economic outcomes.

Closing the loop: Agricultural applications of hydrolyzed polyhydroxyalkanoates production waste.

The increasing global demand for sustainable materials and circular economy solutions has driven research into innovative applications of polyhydroxyalkanoates (PHA) and their by-products. While PHAs are well-recognized biodegradable bioplastics, the potential reuse of waste streams generated during their production remains largely unexplored. This study investigates the feasibility of utilizing hydrolysates derived from PHA post-fermentation biomass as biostimulants for rapeseed (Brassica napus L.

Evidence of Organ-Specific Metal Accumulation: ICP-MS Elemental Analysis of Autopsy Tissues of Tobacco Smokers.

Cigarette smoking exposes individuals to numerous toxic substances, including heavy metals. Smokers are at risk due to the accumulation of these substances in various tissues. Objective: To compare the concentrations of 41 elements in 11 brain regions, the spinal cord, the bronchial, the lungs, and the liver in smokers ( = 11) and non-smokers ( = 17).

Micro- and Nanoplastics as Disruptors of the Endocrine System-A Review of the Threats and Consequences Associated with Plastic Exposure.

Plastic overconsumption has emerged as a major environmental pollutant, with degraded micro- and nanoplastic (MNP) particles being consumed by a vast variety of species. MNPs, particles < 5 mm, contain endocrine-disrupting chemicals (EDCs), which can bind to hormone receptors and disrupt the proper endocrinological function of a variety of organs. This review explores the toxicological impact of MNPs on the hypothalamus, pituitary gland, thyroid, pineal body, ovaries, and testes, as well as the effects of the endocrinological regulatory axes, including the hypothalamic-pituitary-gonadal (HPG), hypothalamic-pituitary-thyroid (HPT), and hypothalamic-pituitary-adrenal (HPA) axes.

Properties of Selected Additive Materials Used to Increase the Lifetime of Tools for Crushing Unwanted Growths Using Hardfacing by Welding Technology.

This article focuses on the possibilities of increasing the service life of tools for crushing unwanted growths. One way to increase their service life is to increase the hardness and resistance to abrasive wear of exposed surfaces of the tool, which are their face and back. At the same time, however, care must be taken to ensure that the shape and weight of the tool is not altered after the additive has been hardfaced on.

Recent Trends in Non-Destructive Testing Approaches for Composite Materials: A Review of Successful Implementations.

Non-destructive testing (NDT) methods are critical for evaluating the structural integrity of and detecting defects in composite materials across industries such as aerospace and renewable energy. This review examines the recent trends and successful implementations of NDT approaches for composite materials, focusing on articles published between 2015 and 2025. A systematic literature review identified 120 relevant articles, highlighting techniques such as ultrasonic testing (UT), acoustic emission testing (AET), thermography (TR), radiographic testing (RT), eddy current testing (ECT), infrared thermography (IRT), X-ray computed tomography (XCT), and digital radiography testing (DRT).

The Impact of the High-Energy Grinding of Wood Ash on Its Pozzolanic Activity.

Wood ash is a promising supplementary cementitious material (SCM) due to its inherent pozzolanic properties. Intensive grinding has been shown to enhance this aspect and reduce the negative effects of variability in the chemical composition. This study investigated the influence of grinding through ball milling on the pozzolanic properties of wood ash.

Modeling and Cutting Mechanics in the Milling of Polymer Matrix Composites.

The study investigates the problem of modeling cutting-force components through response surface methodology and reports the results of an investigation into the impact of machining parameters on the cutting mechanics of polymer-matrix composites. The novelty of this study is the modeling of cutting forces and the determination of mathematical models of these forces. The models describe the values of forces as a function of the milling parameters.