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Institution

University of the Aegean

EducationMytilene, Greece
About: University of the Aegean is a education organization based out in Mytilene, Greece. It is known for research contribution in the topics: Population & Tourism. The organization has 2818 authors who have published 8100 publications receiving 179275 citations. The organization is also known as: UAEG.


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Journal ArticleDOI
TL;DR: Foraminiferal isotope and pollen records from the Portuguese margin were used to reconstruct surface and deep-water hydrography and atmospheric changes during the last and penultimate glacial periods.
Abstract: Periodic iceberg discharges during the last glacial period led to a slowdown of the Atlantic meridional overturning circulation Sediment records from the Portuguese margin show that similar events punctuated the penultimate glacial period as well, although their duration and broader climatic impacts were modified by different background climate conditions During the last glacial period, iceberg discharges into the North Atlantic disrupted the meridional overturning circulation, leading to cooling in the Northern Hemisphere and warming in Antarctica1,2 This asymmetric response can be explained by a bipolar see-saw mechanism3,4,5, whereby changes in the strength of the meridional overturning circulation lead to changes in the interhemispheric heat transport It is unclear, however, to what extent the response of the overturning circulation is a function of freshwater flux and boundary climate conditions4 Here we use foraminiferal isotope and pollen records from the Portuguese margin to reconstruct surface- and deep-water hydrography and atmospheric changes during the last and penultimate glacial periods When we compare our records with temperature reconstructions from Antarctica6, we find that the bipolar see-saw was a characteristic feature of both glacial periods However, the comparison also underlines the dependence of the bipolar see-saw on background climate and magnitude of iceberg discharge It also suggests that an intensified hydrological cycle may lead to a weaker overturning circulation with a smaller disruption threshold and extended North Atlantic stadial durations

156 citations

Journal ArticleDOI
TL;DR: A novel automatic method for the evaluation of summarization systems, based on comparing the character n-gram graphs representation of the extracted summaries and a number of model summaries, which appears to hold a level of evaluation performance that matches and even exceeds other contemporary evaluation methods.
Abstract: This article presents a novel automatic method (AutoSummENG) for the evaluation of summarization systems, based on comparing the character n-gram graphs representation of the extracted summaries and a number of model summaries. The presented approach is language neutral, due to its statistical nature, and appears to hold a level of evaluation performance that matches and even exceeds other contemporary evaluation methods. Within this study, we measure the effectiveness of different representation methods, namely, word and character n-gram graph and histogram, different n-gram neighborhood indication methods as well as different comparison methods between the supplied representations. A theory for the a priori determination of the methods' parameters along with supporting experiments concludes the study to provide a complete alternative to existing methods concerning the automatic summary system evaluation process.

156 citations

Journal ArticleDOI
TL;DR: In this paper, the authors use torsion pairs in stable categories and cotorsion pair in modules categories to study, in general infinitely generated, Cohen-Macaulay modules and (a generalization of) modules of finite projective or injective dimension over an Artin algebra.

155 citations

Journal ArticleDOI
TL;DR: This paper demonstrates that the security services offered by Public Key Infrastructure (PKI) can be employed for fulfilling most of the identified security requirements for an integrated e-government platform.

155 citations

Journal ArticleDOI
Morad Aaboud, Georges Aad1, Brad Abbott2, Ovsat Abdinov3  +2983 moreInstitutions (218)
TL;DR: In this paper, an upper bound of 0.0025% and 0.031% for the cross-section of the charged Higgs boson times the branching fraction in the range 4.2-4.5 pb was established for the mass range 90-160 GeV.
Abstract: Charged Higgs bosons produced either in top-quark decays or in association with a top-quark, subsequently decaying via H$^{±}$ → τ$^{±}$ν$_{τ}$, are searched for in 36.1 fb$^{−1}$ of proton-proton collision data at $ \sqrt{s}=13 $ TeV recorded with the ATLAS detector. Depending on whether the top-quark produced together with H$^{±}$ decays hadronically or leptonically, the search targets τ+jets and τ+lepton final states, in both cases with a hadronically decaying τ-lepton. No evidence of a charged Higgs boson is found. For the mass range of $ {m}_{H^{\pm }} $ = 90–2000 GeV, upper limits at the 95% confidence level are set on the production cross-section of the charged Higgs boson times the branching fraction $ \mathrm{\mathcal{B}}\left({H}^{\pm}\to {\tau}^{\pm }{ u}_{\tau}\right) $ in the range 4.2–0.0025 pb. In the mass range 90–160 GeV, assuming the Standard Model cross-section for $ t\overline{t} $ production, this corresponds to upper limits between 0.25% and 0.031% for the branching fraction $ \mathrm{\mathcal{B}}\left(t\to b{H}^{\pm}\right)\times \mathrm{\mathcal{B}}\left({H}^{\pm}\to {\tau}^{\pm }{ u}_{\tau}\right) $ .

154 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202345
202292
2021479
2020493
2019543
2018447