446494 research outputs found
Sort by
Corrigendum to: Causal relationships in king’s littleneck clam fisheries (Ameghinomya antiqua, P.P. King, 1832) in Los Lagos Region, Chile
No full textRetraction Notice: Formation of a sustainable urban environment in Bukhara: Problems and conflicts
No full textWe take a zero tolerance to any situation where fraudulent research is published in our journals. As a result, this article has been retracted by the Publisher because it is suspected to be a nonsensical computer-generated publication with a number of tortured phrases and irrelevant references.
Additional measures have been implemented to prevent these issues from reoccurring.
EDP Sciences is extremely grateful to anonymous whistleblowers and the Problematic Paper Screene
Retraction Notice: Addressing environmental pollution: Solutions for the Bukhara region at local and regional levels
No full textWe take a zero tolerance to any situation where fraudulent research is published in our journals. As a result, this article has been retracted by the Publisher because it is suspected to be a nonsensical computer-generated publication with a number of tortured phrases and irrelevant references.
Additional measures have been implemented to prevent these issues from reoccurring.
EDP Sciences is extremely grateful to anonymous whistleblowers and the Problematic Paper Screene
Retraction Notice: Securing Pharmaceutical Supply Chain using Blockchain Technology
No full textWe take a zero tolerance to any situation where fraudulent research is published in our journals. As a result, this article has been retracted by the Publisher because it is suspected to be a nonsensical computer-generated publication with a number of tortured phrases and irrelevant references.
Additional measures have been implemented to prevent these issues from reoccurring.
EDP Sciences is extremely grateful to anonymous whistleblowers and the Problematic Paper Screene
Retraction Notice: From Detection to Recovery: The Promise of AI in Managing Postpartum Depression in India
No full textWe take a zero tolerance to any situation where fraudulent research is published in our journals. As a result, this article has been retracted by the Publisher because it is suspected to be a nonsensical computer-generated publication with a number of tortured phrases and irrelevant references.
Additional measures have been implemented to prevent these issues from reoccurring.
EDP Sciences is extremely grateful to anonymous whistleblowers and the Problematic Paper Screene
XMM-Newton multi-year campaign on NGC 55 ULX-1
No full textContext. Winds are an important ingredient in the evolution of X-ray binary (XRB) systems, particularly those at high accretion rates such as ultra-luminous X-ray sources (ULXs), because they may regulate the accretion of matter onto the compact object.
Aims. Our aim is to understand the properties of ULX winds and their link with the source spectral and temporal behaviour.
Methods. We performed high-resolution X-ray spectroscopy of the variable source NGC 55 ULX-1 to resolve emission and absorption lines as observed with XMM-Newton at different epochs. Optically thin plasma models were used to characterise the wind.
Results. We confirmed and thoroughly strengthened previous evidence of outflows in NGC 55 ULX-1. The presence of radiative recombination signatures and the ratios of the fluxes of the emission lines favours photoionisation balance and low to moderate densities, which confirm that the lines originate from classical XRB disc winds. An in-depth parameter space exploration shows line emission from a slowly moving, cool, and variable plasma perhaps associated with a thermal wind. Mildly relativistic Doppler shifts (about −0.15c) associated with the absorption lines confirm, at higher confidence, the presence of powerful radiatively driven winds.
Conclusions. The comparison between the results obtained at different epochs revealed that the wind responds to the variability of the underlying continuum. These variations may be used to understand the actual accretion regime and the nature of the source
Pré-consolidation d’un bassin de boue de lavage d’exploitation de charbon (schlamms) – calculs théoriques et retour d’expérience
No full textLa pré-consolidation de sols compressibles avant construction est une technique éprouvée présentant de nombreux avantages, en particulier lorsque les surfaces concernées sont très grandes : elle devient alors concurrentielle par rapport à la mise en œuvre de fondations profondes. Le temps de consolidation peut être considérablement réduit grâce à l’utilisation de drains verticaux. Dans ce cadre, la mise en place d’une surcharge supplémentaire permet de diminuer le temps d’attente et de s’affranchir de la consolidation secondaire. Cet article présente, sur base d’un cas concret, les principales méthodes de calcul permettant d’estimer les tassements attendus, la durée de la pré-consolidation et l’effet de drains verticaux sur cette durée. Ces méthodes de calcul sont mises en œuvre sur base d’essais géotechniques courants (essais pénétrométriques et essais œdométriques sur échantillons non remaniés). L’article analyse également les caractéristiques de déformabilité des schlamms par différentes approches, expérimentales ou par corrélations (oedomètres, interprétation à partir des CPT, corrélations entre paramètres). Il présente par ailleurs les mesures de tassements effectifs obtenues par profilométrie hydrostatique, méthode qui s’avère primordiale pour vérifier la consolidation au cours du temps, valider le moment correspondant à un degré de consolidation acceptable et estimer le tassement résiduel attendu. L’étude met en évidence la bonne concordance entre les calculs prédictifs et les tassements effectivement observés
Measuring the intergalactic medium correlation length at 5 <
No full textContext. The Lyman-α forest of high-redshift quasars is a powerful probe of the late stages of the epoch of reionization (EoR), in particular thanks to the presence of Gunn-Peterson troughs. These troughs exhibit a broad range of lengths, with some extending up to ∼100 cMpc, suggesting large-scale coherent structures in the intergalactic medium (IGM).
Aims. We aim to gain more insight into the presence, extent, and magnitude of correlations in the Lyman-α forest at the end of reionization, at 5 < z < 6.1. In particular, we want to quantify the scales over which correlations are significant in order to help inform the required size of cosmological simulations aiming to capture the evolution of the EoR.
Methods. We utilized the extended XQR-30 observational dataset over the redshift range 5 < z < 6.1 (Δz = 0.05) to explore large-scale correlations. After accounting for the relevant systematics, the flux correlation matrix proved to be a powerful tool for probing large-scale correlations across redshifts. We performed a Monte Carlo Markov chain analysis to quantify the extent and strength of the correlation, making use of several functional forms. We moreover employed new large-volume (1.53 Gpc3) light cones of Lyman-α transmission implementing different reionization scenarios to interpret the observed signal, including a fiducial box employing SCRIPT.
Results. We detected strong correlations at redshifts z > 5.3, extending at least tens of megaparsecs and strongly increasing with redshift. Our results suggest a redshift-dependent correlation length, from L ≤ 26.53 (68.47) Mpc at 1σ (2σ) limit at redshift z = 5.0 to at redshift z = 6.1. On the contrary, our simulations all demonstrate characteristic correlation scales < 60 Mpc with a very slow redshift evolution, in strong tension with our observations.
Conclusions. The presence and redshift dependence of correlations in the Lyman-α forest on > 200 Mpc scales at z = 6 indicates that cosmological simulations should be larger than this scale to adequately sample the Lyman-α forest. Despite implementing a fluctuating ultraviolet background and numerous neutral islands at z < 6, and matching well the sightline scatter in the Lyman-α forest, our fiducial SCRIPT-based simulation fails to reproduce the large-scale correlations. It may be that those ingredients are necessary, but insufficient, to understand the unfolding of the EoR
Accelerating decarbonisation of housing through deep energy retrofit using modular circular solutions − energy performance impacts & post occupancy evaluation
No full textThe European Union has introduced a range of policy and legislative measures to drive decarbonisation and support the transition to a circular built environment, including a strategy for widespread building and housing energy renovation. Modular construction has been highlighted as a potential pathway to accelerate these objectives. However, significant challenges remain in applying such approaches within a highly complex and heterogeneous building stock. This novel research examines the application of modular solutions in retrofit via a case study of a deep energy retrofit of two 1970's social houses, including application of innovative modular systems, providing an overview of design development, prototyping and realisation, focusing on modularity, circularity, and thermal / energy performance, including occupant feedback. Using a grounded case study methodology integrating mixed qualitative– quantitative methods, the study provides detailed insights into the applicability, challenges and benefits of modular circular retrofit solutions, and resulting thermal and energy performance impacts and occupant feedback. The findings address key knowledge gaps around modularity and circularity in retrofit contexts, showing that conventional modular systems can be adapted to serve as over-clad retrofit solutions while integrating design-for-disassembly and advanced circularity principles, achieving advanced thermal upgrade with associated energy efficiency improvements, and positive occupant experience and benefits
Insights from a nation-wide environmental relicensing of hydropower facilities in Sweden: a review of court verdicts from a biological perspective
No full textHydropower, utilized for centuries, is promoted globally as renewable energy. The many ecological costs associated with hydropower facilities can be mitigated, but the perceived socio-economic benefits often outweigh environmental concern. The EU Water Framework Directive (WFD), implemented in 2000, established a framework for community action in the field of water policy. It constitutes an instrument to compel hydropower facilities to align with environmental requirements. Based on the WFD and national law, a National Plan for Modern Environmental Conditions for Hydropower (NAP) was formulated in Sweden to renegotiate the environmental permits of around 2000 hydropower plants and dams. The NAP process commenced in 2022 and is estimated to last approximately 20 year. In this review, we assessed the 33 court cases completed until the end of 2024, out of which 22 resulted in permit withdrawal and dam removal, while 11 received decisions requiring remedial measures. The primary focus of remedial measures was re-establishing longitudinal connectivity; other environmental aspects received less attention, and monitoring requirements were almost non-existent. We recommend measures using adaptive design, prioritizing functionality, and monitoring over detailed technical specifications. In addition, greater attention should be given also to aquatic habitats in affected reaches: addressing e.g., flow, water levels, and temperature. In conclusion, this nation-wide process provides a unique opportunity to implement measures that could benefit entire riverine ecosystems