3,376 results match your criteria: "National Technical University Of Athens[Affiliation]"

The spectrum of the quasinormal modes of the gravitational waves emitted during the ringdown phase following the merger of two black holes is of primary importance in gravitational astronomy. However, the spectrum is extremely sensitive to small disturbances of the system, thus potentially jeopardizing the predictions of the gravitational-wave observables. We offer an analytical and intuitive explanation of such an instability and its properties based on the transfer matrix approach of quantum mechanics.

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Article Synopsis
  • The study focuses on detecting multijet signatures from proton-proton collisions at a high energy of 13 TeV, analyzing a dataset totaling 128 fb^{-1}.
  • A special data scouting method is utilized to pick out events with low combined momentum in jets.
  • This research is pioneering in its investigation of electroweak particle production in R-parity violating supersymmetric models, particularly examining hadronically decaying mass-degenerate higgsinos, and it broadens the limits on the existence of R-parity violating top squarks and gluinos.
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Article Synopsis
  • Interlaboratory comparisons, or round-robins (RRs), are crucial for gaining regulatory acceptance of non-animal testing methods by demonstrating method reproducibility through shared data analysis.
  • Emerging consensus modelling acts as a "modelling equivalent" to RRs, allowing different models to be compared using a common dataset to increase confidence in predictions.
  • A collaboration of four research groups produced distinct machine learning models predicting the zeta potential of nanomaterials, ultimately integrating them into a consensus model, resulting in improved accuracy and reliability for regulatory applications in nanoinformatics.
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Purpose: Wounds from assault rifles and their commercial offspring have been encountered with increasing frequency in civilian practice. Our aim is to summarize wound ballistics related to the main injury patterns that can also affect management strategies.

Methods: An online search of the PubMed was conducted for research and review articles published after 2000 in English, using the MeSH terms "gunshot wounds", "mass casualty incidents", "war-related injuries", "soft tissue injuries", "vascular system injuries", "colon injuries", "wound infection", "antibiotic prophylaxis", "debridement", "hemorrhage", "penetrating head injuries", "pneumothorax" and additional free-text terms.

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In 2015, all United Nations Member States adopted 17 Sustainable Development Goals (SDGs) for the 2030 agenda. Addressing the issue of employing alternative data sources for exploring aspects of utilizing said goals, this paper explores the Circular Economy dimension within the SDG12 score, focusing on responsible production and consumption and the broader SDG index. Data from LinkedIn are collected, examining profiles, companies, job postings, and services using the keywords 'Sustainable Development Goals' and 'Circular Economy'.

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A hybrid alginate hydrogel-chitosan nanoparticle system suitable for biomedical applications was prepared. Chitosan (CS) was used as a matrix for the encapsulation of lavender () essential oil (LEO) and Mentha () essential oil (MEO). An aqueous solution of an acidic Natural Deep Eutectic Solvent (NADES), namely choline chloride/ascorbic acid in a 2:1 molar ratio, was used to achieve the acidic environment for the dissolution of chitosan and also played the role of the ionic gelator for the preparation of the chitosan nanoparticles (CS-NPs).

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Pesticides are playing a dominant role in modern cultivation practices to increase agricultural production but are also criticized for environmental depletion and soil and underground water degradation in field applications. An imperative need for greener pesticides has emerged in alignment with new innovations in agrarian and agricultural practices. This study provides a comprehensive review of marketable and banned pesticides that have been applied in past times or are still in use in agriculture.

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Chemotherapy remains the primary therapeutic approach in treating cancer. The tumor microenvironment (TME) is the complex network surrounding tumor cells, comprising various cell types, such as immune cells, fibroblasts, and endothelial cells, as well as ECM components, blood vessels, and signaling molecules. The often stiff and dense network of the TME interacts dynamically with tumor cells, influencing cancer growth, immune response, metastasis, and resistance to therapy.

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Surface plasmons, namely, the waves guided at the boundaries between metals and dielectrics, are employed in a variety of engineering applications, spanning from photodetection and near-field scanning to biosensing and medical imaging. The spatial confinement of this effect makes it ideal for a quest towards low-loss guiding of slow light along the interfaces of similar heterostructures. Numerous pairs of materials are considered to determine the conditions for the emergence of strong surface waves, once the visible-light frequency is selected to secure minimum phase velocity or minimum propagation losses.

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Towards circularity in the wind industry: Optimal reverse supply network design under various policy scenarios.

Waste Manag

January 2025

National Technical University of Athens, School of Mechanical Engineering, Sector of Industrial Management and Operational Research, 9 Iroon Polytechniou str., 15780 Zografou, Greece.

Wind energy is key to supply renewable energy. However, the increasing number of end-of-life wind turbines is still predominantly landfilled, while regulatory aspects such as waste shipment and landfilling rules hinder the development and scalable implementation of reverse supply networks. This work aims to understand how EU directives impact the structure and viability of circularity-enabling networks by investigating the optimal reverse supply network design for end-of-life wind turbine blades under different policy scenarios.

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The first search for soft unclustered energy patterns (SUEPs) is performed using an integrated luminosity of 138  fb^{-1} of proton-proton collision data at sqrt[s]=13  TeV, collected in 2016-2018 by the CMS detector at the LHC. Such SUEPs are predicted by hidden valley models with a new, confining force with a large 't Hooft coupling. In events with boosted topologies, selected by high-threshold hadronic triggers, the multiplicity and sphericity of clustered tracks are used to reject the background from standard model quantum chromodynamics.

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In Generative Artificial Intelligence (AI), Large Language Models (LLMs) like GPT-4, Gemini, Claude, and Llama, significantly impact healthcare by aiding in patient care, medical research, and administrative tasks. AI-powered chatbots offer real-time responses and manage chronic diseases, improving patient outcomes and operational efficiency. However, these models pose security and ethical challenges, necessitating robust data privacy, adversarial training, and ethical guidelines.

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This study leverages the DCTPep database, a comprehensive repository of cancer therapy peptides, to explore the application of machine learning in accelerating cancer research. We applied Principal Component Analysis (PCA) and K-means clustering to categorize cancer therapy peptides based on their physicochemical properties. Our analysis identified three distinct clusters, each characterized by unique features such as sequence length, isoelectric point (pI), net charge, and mass.

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A new strategy for modelling sonochemical reactors: Coupling of the non-linear Louisnard model with mass and heat transport equations with applications to cavitating viscous fluids.

Ultrason Sonochem

January 2025

Department of Chemical Engineering, Process Engineering for Sustainable Systems, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium. Electronic address:

In this work, novel numerical models were developed and validated to offer new strategies in modelling sonochemical reactors. More specifically, in our original approach the non-linear Louisnard model was coupled with heat and mass transport equations to predict gradients in temperature and species concentration in a sonicated reactor. Additionally, a new operating window was investigated by modelling mixtures of increasing viscosity on both micro- and macroscale sonochemical effects.

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Climate change has a significant impact on water resources, making it essential to re-evaluate water management strategies and incorporate climate scenarios in assessments. The Municipal Department of Aigeiros is located in the northern part of Greece. Water consumption is high in Aigeiros and the increased future temperatures projected during the summer period will create significant pressures on water resources.

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Modelling Data (MODA) reporting guidelines have been proposed for common terminology and for recording metadata for physics-based materials modelling and simulations in a CEN Workshop Agreement (CWA 17284:2018). Their purpose is similar to that of the Quantitative Structure-Activity Relationship (QSAR) model report form (QMRF) that aims to increase industry and regulatory confidence in QSAR models, but for a wider range of model types. Recently, the WorldFAIR project's nanomaterials case study suggested that both QMRF and MODA templates are an important means to enhance compliance of nanoinformatics models, and their underpinning datasets, with the FAIR principles (Findable, Accessible, Interoperable, Reusable).

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Harnessing deep learning to build optimized ligands.

Nat Comput Sci

November 2024

Molecular Carcinogenesis Group, Department of Histology and Embryology, Medical School, National and Kapodistrian University of Athens, Athens, Greece.

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Background And Purpose: Organic UV filters are commonly used in sunscreen and cosmetic formulations to protect against harmful UV radiation. However, concerns have emerged over their potential toxic effects on aquatic organisms. This study aims to investigate the acute aquatic toxicity of 13 organic UV filters and determine whether phospholipid binding, measured through biomimetic chromatographic methods, is a better predictor of toxicity than the traditionally used octanol-water partition coefficient (log ).

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Simple model for the fracture of a polymer chain: Single-bond potential of mean force and tension-based rate constants for chain rupture.

J Chem Phys

November 2024

School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Street, Zografou Campus, 157 80 Athens, Greece.

A linear chain of N particles connected by Morse bonds with periodic boundaries in a Brownian bath is considered as a model for polymer fracture. The potential of mean force (pomf) with respect to the length of a bond and its energy and entropic components are computed via Langevin Dynamics simulations at various chain elongations λ > 1. A narrow range of λ values is identified over which equilibrium is established between an intact (i) and a fractured (f) state over a pomf barrier.

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Background/objectives: Acute myeloid leukemia (AML) is characterized by therapeutic failure and long-term risk for disease relapses. As several therapeutic targets participate in networks, they can rewire to eventually evade single-target drugs. Hence, multi-targeting approaches are considered on the expectation that interference with many different components could synergistically hinder activation of alternative pathways and demolish the network one-off, leading to complete disease remission.

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This work studies numerically the development of adiabatic shear banding (ASB) during high strain-rate compression of AISI 1045 steel. Plane strain and cylindrical axisymmetric compressions are simulated in LS-DYNA, considering rectangular and cylindrical steel samples, respectively. Also, a parametric analysis in height-to-base ratio is conducted in order to evaluate the effect of geometry and dimensional ratio of the sample on ASB formation.

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Objective: Transcatheter Aortic Valve Implantation (TAVI) has emerged as a pivotal therapeutic modality for aortic stenosis, predominantly in the elderly population. Despite its clinical success, the incidence and implications of vascular complications during TAVI remain a subject of critical concern.

Methods: A retrospective analysis was conducted on 140 patients who experienced vascular complications during TAVI procedures from a total cohort of 1343 cases.

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Cancer exhibits substantial heterogeneity, manifesting as distinct morphological and molecular variations across tumors, which frequently undermines the efficacy of conventional oncological treatments. Developments in multiomics and sequencing technologies have paved the way for unraveling this heterogeneity. Nevertheless, the complexity of the data gathered from these methods cannot be fully interpreted through multimodal data analysis alone.

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This dataset provides a comprehensive set of side channels from fused deposition modeling 3D printers in order to enable the research in the security of additive manufacturing processes against side channel attacks. These attacks exploit indirect signal emanations from physical processes to extract information about a system. Our data was collected using two different methods (iPhone app and Teensy 4.

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Article Synopsis
  • This study investigates how different feature selection methods, machine learning classifiers, and radiomic feature sources influence the accuracy of models predicting clinically significant prostate cancer from MRI data.
  • Two datasets containing 465 and 204 patients allowed for the extraction of 1246 radiomic features, and 480 models were evaluated using various metrics, with the best-performing models leveraging specific feature selection methods and classifiers.
  • The findings highlight the importance of selecting the right feature selection method and source of radiomic features, as they significantly impact model performance for diagnosing prostate cancer.
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