644 research outputs found
Η ανασκαφή της κυνηγετικής εγκατάστασης του Ούριακου της 11ης χιλιετίας π.Χ. στη Λήμνο
No full textΤhe Late Palaeolithic campsite of Ouriakos located on the south-east coast of Lemnos was found in 2006 on a sand-dune during the construction of a carpark close to the beach. Surface collections and excavations during the following years have revealed the rich remains of a hunting camp which is radiocarbon dated to the middle of the 11th mill BC. Lithic assemblages are characterized by a large number of cores, crested blades, back bladelets and end scrapers. However, the most typical implements are microlithic lunates using bipolar retouch without micro-burin technology which can be compared with the material of Öküzini cave in southwest Anatolia. Ouriakos provides strong indications for a northwest spread through Anatolia of the Levantine Late Epipalaeolithic cultural tradition for which very little in known in the Aegean area and the Balkans
Efstratiou N., Biagi P., Karkanas P., Starnini E. - A Late Palaeolithic Site at Ouriakos (Limnos, Greece) in the north-eastern Aegean
No full textThe Neolithic tell as a multi-species monument: Human, animal, and plant relationships through a micro-contextual study of animal dung remains at Koutroulou Magoula, central Greece
No full textNeolithic tells are traditionally considered synonymous to prolonged and persistent human activity. In this paper, micro-contextual examination of dung-related evidence at the Neolithic tell of Koutroulou Magoula, central Greece challenges this anthropocentric view. Thin section analysis demonstrates the abundance of dung indicators – including faecal spherulites, phytoliths, phosphatic impregnative features, and microlaminated fabrics – within a range of deposits and contexts across the site; such evidence was observed in built and unbuilt spaces, and enabled identification of possible penning areas and documentation of the use of dung as fuel source. Targeted archaeobotanical and phytolith analyses of dung-rich deposits point to diverse animal feeding practices and joint human-animal engagement with a range of ecological resources. Based on this integrated evidence which illustrates the significance of animals in co-creating and sharing living environments with humans at Koutroulou Magoula, we argue for the value of a multi-species perspective in Neolithic research.</p
Humans, animals, and the landscape in Neolithic Koutroulou Magoula, Central Greece: An approach through micromorphology and plant remains in dung
No full textThis paper examines evidence on animal diet through the study of dung and its contents in order to discuss animal-related mobility and the use of ecological resources at Neolithic Koutroulou Magoula in central Greece. Micromorphological analysis of intact sediments was employed in order to identify the presence of animal dung in archaeological deposits, thereby providing direct evidence of animal diet. Building on these observations, phytolith and archaeobotanical analyses were used to further investigate plant content of dung-rich deposits. Micromorphology showed that dung was a major contributor to sediment accumulation at the site. It was encountered in trampled (likely penning) deposits, secondary refuse accumulations, and insitu fuel. It was also found that the dung is extremely rich in phytoliths, including wild-grass- and reedderived morphotypes and domesticated cereals. Plant macroremains from dung-rich contexts revealed a similarly diverse picture of animal diet, including cereals, weeds, and fruits. It is thereby suggested that a combination of animal foddering and grazing practices were employed by the inhabitants of Koutroulou. The integration of micromorphology with archaeobotanical, zooarchaeological, and other analytical methods, as well as with broader archaeological, on-site and off-site data, provides a more holistic understanding of human and animal relationships with the environment.</p
Environmental ethics: values in and duties to the natural world (summarized with commentary by Panagiotis Perros)
No full textSummarized with commentary in Greek by Panagiotis Perros.Environmental ethics stands on a frontier, as radically theoretical as it is applied. Alone, it asks whether there can be nonhuman objects of duty. Animals, plants, endangered species, ecosystems, and even Earth are progressively unfamiliar as objects of duty, and puzzles arise both for theory and practice. Answers to such questions are as urgent as any humans face, and intimately related to the four principal issues on the world agenda: peace, population, development, and environment
R-CAUSTIC: Rippling CAUSTICs underwater Image dataset
No full text<p><strong>Description</strong></p><p>Rippling caustics seem to be the main factor degrading the underwater RGB image quality and affecting the image- based 3D reconstruction process in very shallow waters. These effects are adversely affecting image matching algorithms by throwing off most of them, leading to less accurate matches and causing issues in the Simultaneous Localization and Mapping (SLAM) based navigation of the Remotely Operated Vehicles (ROV) and Autonomous Underwater Vehicles (AUV) on shallow waters. Also, they are the main cause for dissimilarities in the generated textures and orthoimages. In order to fill the gap in the literature regading underwater rippling caustics imagery with real ground truth and reference images, the first real-world underwater caustics benchmark dataset which contains 1465 underwater images is presented. Together with the RGB imagery, the corresponding generated ground truth images are delivered for facilitating the training and testing of machine learning and deep learning methods for image classification. R-CAUSTIC dataset also provides the necessary data to evaluate, at least to some extent, the performance of 3D reconstruction approaches. Data were acquired using a GoPro Hero 4 Black action camera with image dimensions of 4000 x 3000 pixels, focal length of 2.77mm and pixel size of 1.55μm and a tripod. Action cameras are widely used for underwater image acquisition. The dataset was captured in near-shore underwater sites at depths varying from 0.5 to 2m. No artificial light sources were used. Due to the wind, the turbulent surface of the water created dynamic rippling caustics on the seabed. In total 1465 RGB images were collected, separated in 7 different datasets; five of them containing stereo images, one of them tri-stereo images and one consists of multi-stereo imagery acquired in 7 different camera poses.</p><p> </p><p><strong>Publication</strong></p><p>The paper is availbale in Open Access here: https://ieeexplore.ieee.org/document/10172291</p><p><strong>If you use this dataset please cite it as R-CAUSTIC</strong> [Reference].<br>[Reference]: <strong>P. Agrafiotis, K. Karantzalos and A. Georgopoulos, "Seafloor-Invariant Caustics Removal From Underwater Imagery," in </strong><i><strong>IEEE Journal of Oceanic Engineering</strong></i><strong>, vol. 48, no. 4, pp. 1300-1321, Oct. 2023, doi: 10.1109/JOE.2023.3277168.</strong></p><p>BibTeX:</p><p>@ARTICLE{10172291,
author={Agrafiotis, Panagiotis and Karantzalos, Konstantinos and Georgopoulos, Andreas},
journal={IEEE Journal of Oceanic Engineering},
title={Seafloor-Invariant Caustics Removal From Underwater Imagery},
year={2023},
volume={48},
number={4},
pages={1300-1321},
doi={10.1109/JOE.2023.3277168}}</p><p> </p>
R-CAUSTIC: Rippling CAUSTICs underwater Image dataset
No full text<p> </p>
<h3><strong>Version 2 available! Please make sure to download the latest version of the dataset! <br></strong></h3>
<p> </p>
<p><strong>Description</strong></p>
<p>Rippling caustics seem to be the main factor degrading the underwater RGB image quality and affecting the image- based 3D reconstruction process in very shallow waters. These effects are adversely affecting image matching algorithms by throwing off most of them, leading to less accurate matches and causing issues in the Simultaneous Localization and Mapping (SLAM) based navigation of the Remotely Operated Vehicles (ROV) and Autonomous Underwater Vehicles (AUV) on shallow waters. Also, they are the main cause for dissimilarities in the generated textures and orthoimages. In order to fill the gap in the literature regading underwater rippling caustics imagery with real ground truth and reference images, the first real-world underwater caustics benchmark dataset which contains 1465 underwater images is presented. Together with the RGB imagery, the corresponding generated ground truth images are delivered for facilitating the training and testing of machine learning and deep learning methods for image classification. R-CAUSTIC dataset also provides the necessary data to evaluate, at least to some extent, the performance of 3D reconstruction approaches. Data were acquired using a GoPro Hero 4 Black action camera with image dimensions of 4000 x 3000 pixels, focal length of 2.77mm and pixel size of 1.55μm and a tripod. Action cameras are widely used for underwater image acquisition. The dataset was captured in near-shore underwater sites at depths varying from 0.5 to 2m. No artificial light sources were used. Due to the wind, the turbulent surface of the water created dynamic rippling caustics on the seabed. In total 1465 RGB images were collected, separated in 7 different datasets; five of them containing stereo images, one of them tri-stereo images and one consists of multi-stereo imagery acquired in 7 different camera poses.</p>
<p> </p>
<p><strong>Publication</strong></p>
<p>The paper is availbale in Open Access here: https://ieeexplore.ieee.org/document/10172291</p>
<p><strong>If you use this dataset please cite it as R-CAUSTIC</strong> [Reference].<br>[Reference]: <strong>P. Agrafiotis, K. Karantzalos and A. Georgopoulos, "Seafloor-Invariant Caustics Removal From Underwater Imagery," in </strong><em><strong>IEEE Journal of Oceanic Engineering</strong></em><strong>, vol. 48, no. 4, pp. 1300-1321, Oct. 2023, doi: 10.1109/JOE.2023.3277168.</strong></p>
<p>BibTeX:</p>
<p>@ARTICLE{10172291, author={Agrafiotis, Panagiotis and Karantzalos, Konstantinos and Georgopoulos, Andreas}, journal={IEEE Journal of Oceanic Engineering}, title={Seafloor-Invariant Caustics Removal From Underwater Imagery}, year={2023}, volume={48}, number={4}, pages={1300-1321}, doi={10.1109/JOE.2023.3277168}}</p>
<p> </p>
Does genetic diversity on corporate boards lead to improved environmental performance?
No full textElsevier
Journal of International Financial Markets, Institutions and Money
Volume 84, April 2023, 101756
Journal of International Financial Markets, Institutions and Money
Does genetic diversity on corporate boards lead to improved environmental performance?
Author links open overlay panelRenatas Kizys a, Emmanuel C. Mamatzakis b, Panagiotis Tzouvanas c
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https://doi.org/10.1016/j.intfin.2023.101756
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Highlights
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We examine the effect of boards’ genetic diversity (GENETICD) on corporate ESG performance.
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ESG performance and disclosures are higher in more genetically diverse firms.
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The positive GENETICD effect on ESG performance is driven by the environmental pillar.
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Corporate carbon performance significantly improves with increases in GENETICD.
We study the effects of boards’ genetic diversity on corporate environmental performance. Using a multidimensional information set for 3690 US firms during the period from 2005 to 2019, and three different measures of genetic diversity, we find that, pursuant to the diversity theory, which posits that diversity improves the quality of management decisions and business ethics, genetic diversity leads to improved environmental performance. We also find that genetic diversity improves carbon and governance performance, and ESG disclosure. Particularly, a one percentage point increase in boards’ genetic diversity will increase the carbon performance, measured by the inverse of the carbon emissions to total assets ratio, and environmental performance by 3.54% and 5.57%, respectively. Our results remain robust to different model specifications, while also controlling for endogeneity. In terms of policy implications, results suggest that the key to tackling climate challenges is to promote boards’ genetic diversity
A dielectric sensor for measuring flow in resin transfer moulding.
No full textThe development, analysis and experimental validation of a novel flow and cure sensor for use in the resin transfer moulding of composites are presented. A linear relationship is established between the flow front position in the mould and electrical admittance measurements gathered using the sensor setup, allowing accurate flow front location. The sensor performance as an indicator of flow front position is evaluated using visual verification. Its efficiency for monitoring of the curing stage is assessed by comparison of the measurements with data obtained from more conventional microdielectrometry. Experimental results demonstrate that the sensor can locate the flow front accurately. The measurement output is in the form of a complex number; this suggests a potential qualitative self-assessment method. The monitoring of the cure process using the new sensor shows performance similar to that of the established microdielectrometric techniques
Fossil macaques (Cercopithecidae, Primates) from the Middle Pleistocene of the Megalopolis basin (Greece) with description of a new specimen from Kyparissia 4
No full textRecent fieldwork in the Megalopolis Basin (Greece) has mainly focused on two Middle Pleistocene sites, Marathousa 1 and Kyparissia 4, both of which yielded rich faunal assemblages (e.g., ostracods, molluscs, fishes, amphibians, reptiles, birds, mammals) in stratigraphic and spatial association with Lower Palaeolithic lithic artefacts, thus documenting hominin presence in the region (Harvati et al., 2018 and articles therein; Karkanas et al., this volume). Marathousa 1 (MAR-1), located in the Marathousa mine, was discovered during targeted fieldwork in 2013 and systematically excavated from 2014 to 2019 by a team from the University of Tübingen Paleoanthropology group and the Ephorate of Paleoanthropology–Speleology (see Harvati et al., 2018 and articles therein). MAR-1 is dated to ca. 450 ka and is correlated to the Marine Isotope Stage 12 (Panagopoulou et al., 2018 and references therein). The site’s large mammal faunal assemblage includes (Konidaris et al., 2018): Castor fiber (beaver), Mustela sp. (weasel), Lutra simplicidens (otter), Felis sp. (wildcat), Vulpes sp. (fox), Canis sp. (medium-sized canid), Palaeoloxodon antiquus (straight-tusked elephant), Hippopotamus antiquus (hippopotamus), Bison sp. (bison), Dama sp. (fallow deer) and Cervus elaphus (red deer). Of particular interest are the skeletal remains of at least two elephant individuals, some of which preserve evidence of anthropogenic modifications
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