Abstract: Vibrations of thin sheet-metal parts during robotic manipulation on a production line create a number of serious challenges for production process planning. Modeling the behavior of an elastic plate or shell as a function of the robot manipulator trajectory is typically performed using the finite element method (FEM) and requires significant computational effort. The time factor remains a key limitation for integrating operations involving flexible parts into the virtual commissioning process. In this work, a methodology is proposed that enables accurate real-time reproduction of the behavior of an elastic part during linear robotic manipulation. The approach is based on modeling the response of an elastic part to a prescribed base excitation using the FEM and on the development of a reduced model compliant with the FMI/FMU standard. This reduced model computes, in real time, the convolution of the precomputed base response with the acceleration profile corresponding to the robot TCP trajectory. This makes it possible to determine the total cycle duration, which consists of the part transfer time and the time required for vibration decay at the end of the trajectory down to an acceptable threshold, as well as to perform collision checking while accounting for the deformation of the flexible part. As a result, operations involving elastic parts can be integrated into the virtual commissioning process.

Abstract: A quartz crystal microbalance-based biosensor for the specific detection of the first transgenic common bean (Phaseolus vulgaris L.) cultivar (BRS FC401 RMD) with resistance to bean golden mosaic virus (BGMV) was developed. The immobilization chemistry relies on the strong bond between the thiolated probe and the gold electrode surface. The probe sequence is internal to a region of the BGMV rep gene that was introduced into the common bean genome. The sensor's analytical performance was determined using synthetic oligonucleotides. Real samples of transgenic and wild-type bean seeds were also tested. Sample pretreatment consisted only of enzymatic fragmentation, followed by a thermal denaturation step combined with blocking oligonucleotides. Different biosensor regeneration approaches were studied. Immobilization showed good reproducibility (CV% of 5.8%). The biosensor proved specific for both synthetic oligonucleotides and non-amplified genomic DNA. A linear detection range of 0–1.4 ng/µL was observed, with a detection limit of 0.18 ng/µL. Three sequential detections were performed without loss of surface activity. The results demonstrate the biosensor's potential for direct, real-time, label-free detection of DNA samples for field screening of transgenic common bean cultivars.

Abstract: Physics-based constitutive modelling remains a cornerstone for predicting ductile damage and fracture in metallic materials, particularly where microstructural mechanisms govern macroscopic response. Over the past two decades, a wide range of crystal plasticity, porous plasticity, and void-based fracture models have been proposed to capture deformation localisation, void growth, and coalescence under complex loading paths. However, these developments are often presented in isolation, obscuring their shared physical assumptions and limiting their transferability across material systems and length scales.This article provides a microstructure-sensitive perspective on constitutive modelling of ductile damage and fracture, with particular emphasis on crystal plasticity-based frameworks, void growth and coalescence mechanisms, and interface-driven fracture. Rather than attempting an exhaustive review, this review highlights unifying concepts, modelling trade-offs, and recurring challenges related to parameter identifiability, scale bridging, and predictive robustness. It further clarifies how physics-based constitutive descriptions can be systematically integrated into modern fatigue and fracture assessments and situate these developments relative to emerging data-assisted and machine-learning-enhanced modelling strategies.By reframing established constitutive models within a coherent physical narrative, this perspective aims to support more transparent model selection, improve interpretability, and guide future developments in multiscale damage and fracture modelling of metallic materials.

Abstract: This paper presents a reliability-oriented analytical framework for the quantitative assessment of fragment-resistant multilayer protective equipment subjected to impulsive fragment loading. The study is motivated by the stochastic nature of fragment generation and impact conditions in industrial and occupational accident scenarios, where deterministic penetration criteria are insufficient to describe protective performance. Fragment interactions are modelled as stochastic spatial events, with impact locations and kinematic characteristics treated as random variables and mapped onto a predefined protected region. System failure is formulated using an energy-based limit-state criterion defined by comparison between the absorbed energy demand induced by fragment impact and a critical admissible energy threshold. The fragment–PPE interaction is described using a reduced-order dynamic formulation with concentrated parameters, capturing the dominant normal deformation response under short-duration impulsive loading. Closed-form analytical expressions are derived that relate fragment mass and velocity to impact impulse and absorbed energy. The resulting formulation establishes a direct link between impulse-driven dynamic response, progressive multilayer engagement, and failure probability under single and repeated impact events. Application of the proposed framework to a representative multilayer protective configuration demonstrates physically consistent reliability trends and confirms its computational efficiency. The framework provides a practical tool for reliability-informed assessment and preliminary design of fragment-resistant multilayer protective equipment.

Abstract: The digital preservation of batik, a world intangible cultural heritage, is hindered by the difficulty in performing accurate semantic segmentation on its complex patterns with limited annotated samples. To address this few-shot learning challenge, we constructed a few-shot batik pattern dataset, and proposed a novel network architecture centered on attention weighting and hierarchical decoding. Our method leverages a pre-trained ResNet101 backbone for transfer learning to establish a strong feature foundation. It incorporates a dual-attention module that combines spatial and channel attention to dynamically highlight semantically rich regions and intricate texture boundaries specific to batik. For multi-scale context aggregation, a lightweight module utilizing parallel dilated convolutions is introduced to efficiently capture features from varying receptive fields. Finally, a hierarchical decoder progressively integrates these enhanced, multi-scale features with high-resolution shallow features to reconstruct precise segmentation maps. Comprehensive evaluations on a dedicated batik dataset show that our model achieves state-of-the-art performance, with a mean Intersection over Union (mIoU) of 79.22% and a Pixel Accuracy (PA) of 92.47%. It notably improves over the strong DeepLabV3+ baseline by 3.3% in mIoU and 0.95% in PA, demonstrating its effectiveness for the task of batik pattern segmentation under data-scarce conditions.

Abstract: The mandates of the Circular Economy (CE) and Industry 5.0 necessitate unprecedented life cycle traceability and management for complex products, such as electronics and lithium-ion batteries. The Digital Product Passport (DPP) has emerged as the centralized data framework for this transition. However, effective DPP implementation requires the robust integration of technologies to overcome the technical challenges of scalability, data integrity, and legacy system management. This work shifts from a high-level conceptual overview to an in-depth technical analysis, detailing the integration architecture of the DPP with the Internet of Things (IoT), Digital Twins (DTs), and Artificial Intelligence (AI). Specifically, we focus on how IoT, via embedded sensors and NFC/RFID tags, acts as the dynamic data carrier that feeds DT. For the battery sector, we propose a technical framework that utilizes the DPP to continuously track State of Health (SoH) and State of Charge (SoC), throughout the entire life cycle. AI/Machine Learning is then integrated within the DT to enable accurate predictions of degradation and failure, directly addressing reliability concerns and optimizing the second life and recycling phases. Our focus is on tackling critical bottlenecks, such as interoperability between IT systems and data storage scalability (e.g., via robust Cloud or Blockchain solutions), ensuring the DPP is established not just as a static data repository, but as a dynamic and predictive tool for product reliability management and regulatory compliance.

Abstract: Air Quality (AQ) plays a critical role in public health and urban sustainability, but drawing insights from Air Quality data remains challenging due to fragmented sources, inconsistent formats and varying measurement standards and devices. This paper explores the architecture and standardization of Air Quality datasets from major global monitoring systems, specifically the U.S. EPA’s Air Quality System (AQS) and European Environment Agency (EEA) networks, emphasizing discrepancies in pollutant units, reporting frequencies and metadata quality. The report outlines key pollutants due to road transport emissions and how they are measured using a range of technologies, from fixed regulatory stations to low-cost and satellite-based sensors. The inconsistency in schema design and the lack of interoperability across datasets hinder the scalability of machine learning (ML) pipelines, which rely on clean and harmonized inputs. To address this, an application named “Data Manager Tool” is introduced that ingests, transforms and standardizes heterogeneous AQ data into a centralized “PostgreSQL” database using a star schema. This allows more efficient querying, integration and modeling. The report discusses practical applications of this system, and how it paves the way for scalable ML-based analysis of pollution trends. Future efforts will focus on professional ML approaches, integration of mobile sensor data, and extending the framework to support predictive models and optimization using meteorological and transport datasets.

Abstract: This study aims to conduct and experimental modal analysis of a very lightweight composite structure representative of UAV application and to evaluate the suitability of different testing approaches for reliable identification of its dynamics characteristics. The investigated structure is a winglet made of carbon fibre reinforced polymer (CFRP) with a lightweight foam core. The experimental campaign was based on impact hammer excitation combined with triaxial accelerometer measurements. Modal test were performed under three different boundary conditions: free-free suspension using elastic cords, free-free approximation using compliant foam support, and fixed conditions reflecting to the operational mounting of the winglet. The objective of the study is not only to identify natural frequencies and mode shapes, but primarily to assess the influence of support conditions, excitation quality and measurement-induced mass loading on the reliability of the extracted modal parameters. By comparing the obtained frequency response functions and modal characteristics across different test configurations, the work seeks to identify the most appropriate experimental approach for modal analysis of ultra-lightweight composite UAV structures, providing practical guidance for future vibration investigations.

Abstract:

A solar-air source absorption heat pump (SAAHP), which mainly consists of a solar collector, a fan coil, and an absorption heat pump equipped with a gas-fired combustor, has been proposed for water heating. This system runs in SD (Solar-energy driving) or GD (Gas-combustion-heat driving) mode, designed to utilize renewable energies as much as possible. The models for each component were built and the corresponding heat and mass balance equations were established. The performance of SAAHP based on LiBr/H₂O and LiNO₃/H₂O working fluids was simulated and compared with an air source absorption heat pump (AAHP) based on LiBr/H₂O. Results indicated that SAAHP based on LiNO₃/H₂O has a higher solar energy utilization rate than that based on LiBr/H₂O due to its lower solar collector inlet temperature in SD mode. In comparison to AAHP based on LiBr/H₂O, SAAHP based on both of LiBr/H₂O and LiNO₃/H₂O achieved a higher primary energy COP throughout a year. Relative to a gas-fired hot water boiler, SAAHP based on LiNO₃/H₂O and LiBr/H₂O achieved yearly primary energy saving rates of 46.2% and 40.0%, respectively, whereas AAHP just achieved 12.2%. SAAHP based on LiNO₃/H₂O shows significant energy saving potential in the building energy consumption.

Abstract: The main purpose of the paper is to show the possibility of assessing the dynamic properties of crankshaft in the early design phase of engine development, without performing dynamic forced response simulation. This is achieved by carrying out modal analysis of crankshaft under existing boundary conditions, namely by taking the radial stiffness in main bearings and the masses of moving conrods and pistons into account. The spectra of eigenfrequencies and corresponding mode shapes as a result of such supported modal analysis are compared to those of free modal analysis, emphasizing the influence of the boundary conditions. To easily identify the modes and to compare them with each other, kinetic energy-based method is used, alongside visualization and animation of mode shapes. The examples of crankshafts considered in the paper are taken from model catalog of virtual engines of six different sizes and configurations, being compared to that of in-line 4-cylinder engine as the reference case. All types of modal analysis are performed on structured FE models of crankshafts using software tool AVL EXCITE™ Shaft Modeler.

Abstract: Effective implementation of university extension projects requires a structured ap-proach with explicit objectives, dependencies, and resource constraints. Automated planning, particularly Hierarchical Task Network (HTN) planning, provides an opera-tional method to schedule complex activities by decomposing high-level goals into ex-ecutable tasks. This paper presents a tool that converts university project documents into BPMN 2.0 declarative processes and automatically produces HTN planning in-puts. Following the Design Science Research methodology, the architecture integrates (i) a pre-planner parser that extracts activities, roles, and precedence relations from BPMN models, (ii) generators that create domain and problem files, and (iii) the HTN planners SHOP 2 and PyHOP to synthesize executable plans. The system was validated with three categories of projects provided by two public universities in Colombia: Universidad Nacional de Colombia and Universidad de Caldas. The platform produces multiple alternative plans for each project and reports plan length and solution-search cost, enabling direct comparison across planners. Results show that the proposed workflow reduces manual scheduling effort, improves consistency of implementation roadmaps, and supports evidence-based selection of implementation strategies under different constraints. These capabilities help extension offices formalize knowledge, audit decisions, and reuse plans across initiatives. Traceability links BPMN elements to planning tasks.

Abstract: Multimodal Named Entity Recognition (MNER) leverages both textual and visual information to improve entity recognition, particularly in unstructured scenarios such as social media. While existing approaches predominantly rely on raster images (e.g., JPEG, PNG), Scalable Vector Graphics (SVG) offer unique advantages in resolution independence and structured semantic representation—an underexplored potential in multimodal learning. To fill this gap, we propose MNER-SVG, the first framework that incorporates SVG as a visual modality and enhances it with ChatGPT-generated auxiliary knowledge. Specifically, we introduce a Multimodal Similar Instance Perception Module that retrieves semantically relevant examples and prompts ChatGPT to generate contextual explanations. We further construct a Full Text Graph and a Multimodal Interaction Graph, which are processed via Graph Attention Networks (GATs) to achieve fine-grained cross-modal alignment and feature fusion. Finally, a Conditional Random Field (CRF) layer is employed for structured decoding. To support evaluation, we present SvgNER, the first MNER dataset annotated with SVG-specific visual content. Extensive experiments demonstrate that MNER-SVG achieves state-of-the-art performance with an F1 score of 82.23%, significantly outperforming both text-only and existing multimodal baselines. This work validates the feasibility and potential of integrating vector graphics and large language model–generated knowledge into multimodal NER, opening a new research direction for structured visual semantics in fine-grained multimodal understanding.

Abstract: A laboratory–scale mechanical draft cooling tower equipped with eight sections of perforated inclined plates was designed to determine the effect of operating conditions on the volumetric mass transfer coefficient (kya) between water and air. A three–factor, three–level design of experiments (DOE) was implemented, considering liquid mass flow rate L (120, 240, and 360 kg/h), gas mass flow rate G (36, 57, and 75 kg/h), and top water temperature TL2 (50, 60, and 70◦C). A total of 54 runs were performed, and the global volumetric mass transfer coefficient was calculated by combining energy and mass balances with the Mickley method. The experimental data were fitted to a power–law correlation using multivariable regression. The ANOVA showed that TL2 is the dominant factor, followed by L, whereas the influence of G is comparatively small in the studied range. The selected correlation, based on the nominal gas flow rate, achieved R2=0.869 and a RMSE of 5930 kg/(m3h). The kya values were found in the range from 4600 to 62000 kg/(m3h). Vertical temperature profiles of water and air along the column revealed that, for high liquid flow rates, most of the cooling occurs in the lower stages, suggesting that the upper sections are underutilized.

Abstract: This paper addresses distributed formation control for multiple unmanned aerial vehicles (UAVs) operating in obstacle-dense environments under directed switching communication topologies. A leader–follower architecture is adopted, wherein the leader performs online trajectory replanning while followers rely on delayed and intermittently available neighbor information. To simultaneously tackle collision avoidance, formation feasibility under narrow passages, and communication intermittency, we propose an integrated deformable formation navigation framework. The framework couples Safe Flight Corridor (SFC)-constrained Bézier trajectory planning with a dynamic formation scaling mechanism, allowing the swarm to adaptively shrink or expand its geometric configuration when traversing constricted spaces, thereby ensuring all agents remain within certified collision-free corridors. A nonlinear distributed consensus-based estimator is designed to propagate leader reference states under directed switching graphs with bounded delays. Using a max-min contraction analytical approach, we establish guaranteed practical convergence for both leader tracking and inter-follower agreement without requiring persistent connectivity. Extensive simulations in complex cluttered environments demonstrate that the proposed approach enables flexible and real-time formation reshaping, enhancing navigational safety and robustness while maintaining cohesive swarm behavior under challenging communication and spatial constraints.

Abstract: The widescale deployment of radars, distributed across a platform and across multiple platforms for reliable 360° situational awareness (SA), introduces the challenge of radar interference. Interference can broadly be categorised as self-interference (between radars mounted on the same platform) and mutual interference (signals received from radars on other platforms). Both types of interference impede the reliability of SA delivered by such systems, particularly in dense environments where numerous radars operate simultaneously within the same frequency band. This work presents a comprehensive evaluation of a multi-modal beamforming approach that combines unfocused synthetic aperture radar with the traditional Multiple-Input, Multiple-Output beamformer to enhance radar resolution and suppress interference. Additionally, various aspects of sensor configurations defining hardware and software capabilities of state-of-the-art radars are discussed, and a systematic analysis of signal-to-interference-plus-noise ratio at each step of the processing is presented. Extensive simulations and experimental results in both automotive and maritime environments are shown to validate the effectiveness of the proposed approach.

Abstract: The design, fabrication, and characterization of a highly transparent and flexible monopole antenna optimized for the 3–6 GHz frequency band is presented in this paper. In traditional Transparent Conductive Oxide (TCO) designs, there is always a trade-off between the RF efficiency and transparency. Therefore, an Aerosol Jet® 5X system was used to directly print a silver nanoparticle mesh over a 50-µm polyimide (PI) substrate. With this fabrication method, a durable structure was yield which works well both electrically and mechanically with 85% transparency and a gain of −2.5 dBi. In order to demonstrate how the antenna is flexible and compatible with other devices, it was bent over a cylindrical body and was integrated with a commercial solar panel. The results show that impedance matching and radiation characteristics of the antenna remain stable under bending conditions, and no critical decrease was observed in solar energy harvesting. Consequently, this design presents a suitable solution for energy-autonomous IoT systems, smart windows, and CubeSat applications.

Abstract:

The transition to hydrogen-fueled gas turbines is vital for decarbonising power systems, especially in space- and weight-constrained applications such as offshore FLNG and FPSO. While hydrogen offers zero-carbon emissions at the point of use, its use in gas turbines faces technical challenges due to high flame speed, flammability limits, low energy density, and high flame temperature. These increase the risks of flashback and NOₓ formation, especially when retrofitting existing combustors. Developing hydrogen-ready combustors for both pure hydrogen and blends is an ongoing research area. This study investigates a can-type, annular gas turbine combustor for use with pure hydrogen and blends. Using CFD simulations in ANSYS Fluent, it analyses flow, flame, temperature, and stability across hydrogen ratios from 0% to 100%. The model employs RANS equations, a realizable k–ε turbulence model, non-premixed combustion, and species transport; thermal radiation is modelled with the P-1 method, and NOₓ with the Zeldovich mechanism. Results show hydrogen increases flame reactivity, shortens flame length, and enhances recirculation zones, maintaining stability at ~50% hydrogen. Higher fractions increase flame temperature and velocity, increasing the risk of flashback. Pure hydrogen produces compact, high-temperature flames that require advanced designs for stability. Model predictions match experimental and published data from NASA, Siemens SGT-800, GE LM6000, and Kawasaki, confirming credibility. This CFD assessment offers insights into hydrogen combustor design, supporting the move towards hydrogen-ready turbines and low-carbon offshore power generation.

Abstract: Nature-like fishways (NLFs) are a key restoration measure for fragmented rivers at low-head barriers, yet their economic and functional performance is poorly documented. This study provides a comprehensive analysis of 134 NLF projects in Spain (2003–2025), classifying them by typology, energy dissipation elements, and construction method. We quantified construction costs using standardized indicators and assessed available hydraulic and biological efficiency data. Results show a predominance of public funding schemes and a strong geographical concentration of NLFs in the northern half of the country, with ramps (76.1%) being more frequent than bypass channels. Construction costs varied markedly among designs, with concrete boulder ramps consistently representing the most cost-intensive NLF configurations, while also being strongly influenced by local site conditions and construction constraints. Only a small fraction of projects (13.4%) underwent post-construction efficiency assessment, but those evaluated generally showed favorable performance for multiple fish species. Our findings provide a state-of-the-art overview of NLFs in Spain, together with a practical classification framework and standardized cost indicators to support the planning and prioritization of river connectivity restoration projects.

Abstract: In this paper, we propose an correntropy weighted extended Kalman filter (CWEKF) method to address the challenges of low estimation accuracy and poor robustness in sensorless rotor speed estimation for doubly-fed induction generators (DFIGs). Firstly, based on Faraday's law of electromagnetic induction and the mechanical motion equation, we derive a DFIG nonlinear state-space model. This model quantifies the sources of nonlinearity arising from cross-coupling terms and product terms, providing a precise model foundation for rotor speed estimation. Secondly, we introduce correntropy theory to design a residual dynamic weighting scheme. By quantifying the local similarity between current and historical residuals, the scheme adaptively adjusts the noise covariance estimation weights, suppressing the interference of outdated data. Combined with the Chi-squared test, we derive an adaptive kernel bandwidth mechanism, balancing the response speed to noise variations and the estimation accuracy in steady-state. Additionally, we further integrate Huber robust weighting and regularization techniques for constructing a hybrid weighting mechanism and optimizing the covariance positive-definiteness correction to address the numerical stability deficiencies of the original algorithm. Using the Lipschitz condition and Lyapunov theory, we prove the mean-square exponential boundedness of the CWEKF estimation error. Finally, we build a DFIG vector control model using MATLAB. Comparative experiments are conducted with EKF, AEKF, and RWEKF under three operating conditions. The results show that the CWEKF has a maximum rotor speed estimation error \( \leq \) 5 r/min, and the response time has been reduced by 65% compared to the traditional EKF, exhibiting significantly improved robustness under parameter variations and strong noise conditions.

Abstract: Ulaanbaatar, the capital of Mongolia, operates one of the world’s largest district heating (DH) systems in the coldest national capital (Heating Degree Days ~5800). Despite serving over 60% of the city’s 1.6 million residents, the current 3rd generation DH system suffers from high thermal losses (~17–18%) and relies on coal-fired combined heat and power plants. Transitioning to 4th generation district heating (4GDH) with lower supply temperatures could reduce these losses while enabling future low-temperature renewable energy integration. This GIS-based spatial heat load density (HLD) analysis uses operational data from the Ulaanbaatar District Heating Company, encompassing 13,500 buildings with a total connected capacity of 3,924 MW. Grid-based spatial analysis was performed at two resolutions (1 km² and 2 km²). Threshold sensitivity analysis was conducted across HLD criteria of 1–5 MW/km². Results indicate that median HLD values exceed the European reference threshold of 3 MW/km², with log-normal distributions confirmed by Shapiro–Wilk tests. Three candidate pilot zones were identified. A hybrid temperature strategy (65/35 °C above −25 °C; 90/60 °C below) further contextualizes the findings. These results suggest spatially favorable conditions for 4GDH development, providing a quantitative foundation for subsequent techno-economic feasibility studies.