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Institution

University of Ioannina

EducationIoannina, Greece
About: University of Ioannina is a education organization based out in Ioannina, Greece. It is known for research contribution in the topics: Population & Large Hadron Collider. The organization has 7654 authors who have published 20594 publications receiving 671560 citations. The organization is also known as: Panepistimio Ioanninon.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors proposed the liquid-scintillator detector LENA (Low Energy Neutrino Astronomy) as a multipurpose neutrino observatory.

258 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the predicted redshift dependence of the equation of state parameter $w(z)$ for a wide range of slopes in both quintessence and phantom models and found that the best fit is very close to $s\ensuremath{\simeq}0$ corresponding to a cosmological constant.
Abstract: We study quintessence and phantom field theory models based on linear-negative potentials of the form $V(\ensuremath{\phi})=s\ensuremath{\phi}$. We investigate the predicted redshift dependence of the equation of state parameter $w(z)$ for a wide range of slopes $s$ in both quintessence and phantom models. We use the Gold data set of 157 SnIa and place constraints on the allowed range of slopes $s$. We find $s=0\ifmmode\pm\else\textpm\fi{}1.6$ for quintessence and $s=\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}1$ for phantom models (the range is at the $2\ensuremath{\sigma}$ level and the units of $s$ are in $\sqrt{3}{M}_{\mathrm{P}}{H}_{0}^{2}\ensuremath{\simeq}{10}^{\ensuremath{-}38}\text{ }\text{ }\mathrm{e}{\mathrm{V}}^{3}$ where ${M}_{\mathrm{P}}$ is the Planck mass). In both cases the best fit is very close to $s\ensuremath{\simeq}0$ corresponding to a cosmological constant. We also show that specific model independent parametrizations of $w(z)$ which allow crossing of the phantom divide line $w=\ensuremath{-}1$ (hereafter PDL) provide significantly better fits to the data. Unfortunately such crossings are not allowed in any phantom or quintessence single field model minimally coupled to gravity. Mixed models (coupled phantom-quintessence fields) can in principle lead to a $w(z)$ crossing the PDL but a preliminary investigation indicates that this does not happen for natural initial conditions.

258 citations

Journal ArticleDOI
TL;DR: An inventory model with general ramp type demand rate, time dependent (Weibull) deterioration rate and partial backlogging of unsatisfied demand is considered and the optimal replenishment policy for the model is derived.

257 citations

Journal ArticleDOI
TL;DR: The aim of the present work is to classify the emerging problems and propose satisfactory answers to magnetic drug targeting, and a general phenomenological theory is developed and a model case is studied, which incorporates all the physical parameters of the problem.

257 citations

Journal ArticleDOI
TL;DR: Of many proposed risk factors, only three had strong association without hints of bias, and Identification of genuine risk factors associated with endometrial cancer may assist in developing targeted prevention strategies for women at high risk.
Abstract: Although many risk factors could have causal association with endometrial cancer, they are also prone to residual confounding or other biases which could lead to over- or underestimation. This umbrella review evaluates the strength and validity of evidence pertaining risk factors for endometrial cancer. Systematic reviews or meta-analyses of observational studies evaluating the association between non-genetic risk factors and risk of developing or dying from endometrial cancer were identified from inception to April 2018 using PubMed, the Cochrane database and manual reference screening. Evidence was graded strong, highly suggestive, suggestive or weak based on statistical significance of random-effects summary estimate, largest study included, number of cases, between-study heterogeneity, 95% prediction intervals, small study effects, excess significance bias and sensitivity analysis with credibility ceilings. We identified 171 meta-analyses investigating associations between 53 risk factors and endometrial cancer incidence and mortality. Risk factors were categorised: anthropometric indices, dietary intake, physical activity, medical conditions, hormonal therapy use, biochemical markers, gynaecological history and smoking. Of 127 meta-analyses including cohort studies, three associations were graded with strong evidence. Body mass index and waist-to-hip ratio were associated with increased cancer risk in premenopausal women (RR per 5 kg/m2 1.49; CI 1.39-1.61) and for total endometrial cancer (RR per 0.1unit 1.21; CI 1.13-1.29), respectively. Parity reduced risk of disease (RR 0.66, CI 0.60-0.74). Of many proposed risk factors, only three had strong association without hints of bias. Identification of genuine risk factors associated with endometrial cancer may assist in developing targeted prevention strategies for women at high risk.

256 citations


Authors

Showing all 7724 results

NameH-indexPapersCitations
John P. A. Ioannidis1851311193612
Kay-Tee Khaw1741389138782
Elio Riboli1581136110499
Mercouri G. Kanatzidis1521854113022
Dimitrios Trichopoulos13581884992
Gyorgy Vesztergombi133144494821
Niki Saoulidou132106581154
Apostolos Panagiotou132137088647
Ioannis Evangelou131122582178
Ioannis Papadopoulos129120185576
Nikolaos Manthos129125681865
Panagiotis Kokkas128123481051
Costas Foudas128111283048
Zoltan Szillasi128121484392
Matthias Schröder126142182990
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202335
2022131
20211,222
20201,203
20191,125
20181,003