cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Lithospheric-scale 3D model of Sicily domain based on gravity analysis
Creators: name:  Floridia ,  Giovanni
name:  Anikiev ,  Denis
name:  Viccaro ,  Marco
Publisher: name: Deutsche Geologische Gesellschaft - Geologische Vereinigung e.V. (DGGV)
Year: 2021

description: Sicily is a part of the central-Western Mediterranean area and represents a geotectonic boundary between the African and European plates. It is the result of a complex geological process based on a polyphasic evolution of a compressional step beginning with the Oligocene-Miocene clockwise rotation of Corsica-Sardinia simultaneously with the extensional processes of the Tyrrhenian basin. Consequently, the area is constrained by the continuing partial advance of the Sicilian-Maghrebian chain southwards and the Tyrrhenian extensional area towards the internal foreland areas (Hyblean domain). The study focuses on the creation of a 3D lithospheric-scale model of a 300 km x 400 km extended area in the central Mediterranean domain (Lat38°, Lat35°), which is consistent with the available geological and geophysical data, as well as with the observed gravity field. The reconstructed (simplified) geological setting consists of a lithospheric mantle, a crystalline basement (continental and oceanic crust), carbonates, the European margin and the Neogene-quaternary cover including volcanic bodies. The work aims to investigate the geometry of lithosphere integrating tomographic models in order to assess the major density contrasts and the lithospheric thermo-mechanical state. The regional 3D model provides also the boundary conditions for local thermal models to investigate afterwards.
Zero surface tension limit of viscous surface waves
Creators: name: Tan, Zhong
name: Wang, Yanjin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We consider the free boundary problem for a layer of viscous, incompressible fluid in a uniform gravitational field, lying above a rigid bottom and below the atmosphere. For the "semi-small" initial data, we prove the zero surface tension limit of the problem within a local time interval. The unique local strong solution with surface tension is constructed as the limit of a sequence of approximate solutions to a special parabolic regularization. For the small initial data, we prove the global-in-time zero surface tension limit of the problem.
description: 57pp. arXiv admin note: substantial text overlap with arXiv:1011.5179, arXiv:1109.1798
Observer Design for (max,plus) Linear System
Creators: name: Hardouin, L.
name: Maia, C. A.
name: Cottenceau, B.
name: Lhommeau, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This paper deals with the state estimation for max-plus linear systems. This estimation is carried out following the ideas of the observer method for classical linear systems. The system matrices are assumed to be known, and the observation of the input and of the output is used to compute the estimated state. The observer design is based on the residuation theory which is suitable to deal with linear mapping inversion in idempotent semiring.
Numerical Modelling of the Impact of Cover Thickness on the Long-term Water Balance of Reclamation Soil Covers Over Lean Oil Sands Overburden
Creators: Huang, Mingbin
Alam, Shahabul
Barbour, Lee
Si, Bing Cheng
Publisher: name: University of Alberta Library
Year: 2017

Syncrude Canada Ltd. (SCL) is undertaking a watershed scale research program to evaluate the performance of reclamation covers placed over lean oil sands (LOS) at the Fort Hills dump at the Aurora North mine site. This research study is referred to as the Aurora Capping Study (ACS). A key element of the ACS is the assessment of the water balance for alternate cover designs in regard to their adequacy to meet site vegetation growth requirements. (As cited in Background and Objectives.)
title: Ψυχική υγεία κατά τη διάρκεια της πανδημίας σε σχέση με αλλαγές στη διατροφή, στην κατανάλωση αλκοόλ, στην άσκηση και στον ύπνο
title: Mental health during the pandemic in relation to changes in diet, consumption of alcohol, exercise activities and sleep
titleType: AlternativeTitle
Creators: name: Γεωργανά, Μαργαρίτα
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Covid-19
Πανδημία
Καραντίνα
Ψυχική υγεία
Σωματική δραστηριότητα
Ποιότητα ζωής
Τρόπος ζωής
Διατροφή
Αλκοόλ
Αϋπνία
Ύπνος
Ευεξία

description: Εισαγωγή: η πανδημία COVID-19 οδήγησε στην εφαρμογή υγειονομικών μέτρων για την προστασία της Δημόσιας υγείας και επέφερε πολυάριθμους περιορισμούς στην καθημερινή ζωή. Μολονότι τα μέτρα ήταν επιτακτικά για τον περιορισμό της εξάπλωσης του ιού, προκλήθηκαν σημαντικά επακόλουθα, λόγω του αντίκτυπου αυτών των περιορισμών στις συμπεριφορές υγείας και στον τρόπο ζωής των ανθρώπων. Σκοπός: αυτής της ανασκόπησης είναι η καταγραφή των αλλαγών που επέφερε η πανδημία στις διατροφικές συνήθειες, στην κατανάλωση αλκοόλ, στη σωματική δραστηριότητα και στον ύπνο. Υλικό και Μέθοδος: Πραγματοποιήθηκε ανασκόπηση επιστημονικών άρθρων από τη διεθνή βιβλιογραφία που δημοσιεύτηκαν από το Μάρτιο του 2020 (2020-2022), μέχρι σήμερα. Η αναζήτηση της βιβλιογραφίας έλαβε χώρα από τον Απρίλιο 2021 έως το Φεβρουάριο του 2023. Βασικές πηγές αναζήτησης είναι οι βάσεις δεδομένων: PubMed, Med Line, Scopus, Google Scholar. Αποτελέσματα: Η κοινωνική απόσταση που επιβλήθηκε ως βασικό μέτρο περιορισμού του ιού, είχε σημαντικό ψυχολογικό και κοινωνικό αντίκτυπο στα άτομα όλων των ηλικιακών ομάδων, σε παγκόσμιο επίπεδο. Επέφερε αλλαγές στα διατροφικά πρότυπα, στη σωματική δραστηριότητα, διατάραξε τις συνήθειες του ύπνου και διαπιστώθηκε αύξηση της κατανάλωσης αλκοόλ από εκείνους που έκαναν ήδη χρήση αλκοόλ σε επικίνδυνα επίπεδα. Συμπεράσματα: Ο αντίκτυπος της πανδημίας δεν είναι ακόμα πλήρως ορατός. Εκτός από τον μεγάλο αριθμό θανάτων και τις μακροπρόθεσμες επιπτώσεις στην υγεία, έθεσε σε σημαντικό κίνδυνο την προσωπική και οικογενειακή ασφάλεια. Οι πολιτικές υγείας επικεντρώθηκαν στη πρόληψη της εξάπλωσης του ιού και στη δημιουργία κατάλληλων συνθηκών για τη διαχείριση των ασθενών, όμως τα περιοριστικά μέτρα που επιβλήθηκαν, είχαν σημαντικό ψυχολογικό και κοινωνικό αντίκτυπο. Η διαρκής έρευνα των επιστημόνων, η συνεχής επιτήρηση και επαγρύπνηση για τον έλεγχο του ιού, μαζί με τις παρεμβάσεις της δημόσιας υγείας, πρέπει να αποτελούν θεμελιώδεις πυλώνες αντιμετώπισης κάθε υγειονομικής κρίσης.
OCR-directed evaluation of binarization techniques
Creators: name: Vinas, Diego Antonio
Publisher: name: University of Nevada, Las Vegas
Year: 2000

description: The objective of this work is to study different binarization methods and to investigate their effect on the performance of OCR systems. Two sets of document images and four OCR systems were used to study several binarization algorithms. The simplest method that chooses the median value of the gray levels, i.e., 127 from 256 levels, as the global threshold value did not work well unless the scanner characteristic matched with the nature of a collection of documents by chance. The best-fixed method uses the global threshold value that minimizes the number of overall errors for a combination of an OCR system and a collection of documents. Both Otsu's global algorithm and Niblack's local algorithm performed, on the average, as well as the best-fixed method for the test data sets. The ideal global threshold method selects the best global threshold value for each combination of a page and an OCR system. Although the ideal method outperformed, on the average, Niblack's method, Niblack's method processed some images better than the ideal method.
Coupling between time series: a network view
Creators: name: Mehraban, Saeed
name: Shirazi, Amirhossein
name: Zamani, Maryam
name: Jafari, Gholamreza
Publisher: name: arXiv
Year: 2013
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: Recently, the visibility graph has been introduced as a novel view for analyzing time series, which maps it to a complex network. In this paper, we introduce new algorithm of visibility, "cross-visibility", which reveals the conjugation of two coupled time series. The correspondence between the two time series is mapped to a network, "the cross-visibility graph", to demonstrate the correlation between them. We applied the algorithm to several correlated and uncorrelated time series, generated by the linear stationary ARFIMA process. The results demonstrate that the cross-visibility graph associated with correlated time series with power-law auto-correlation is scale-free. If the time series are uncorrelated, the degree distribution of their cross-visibility network deviates from power-law. For more clarifying the process, we applied the algorithm to real-world data from the financial trades of two companies, and observed significant small-scale coupling in their dynamics.
Theory of a chiral Fermi liquid: general formalism
Creators: name: Ashrafi, Ali
name: Rashba, Emmanuel I.
name: Maslov, Dmitrii L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We extend the Fermi-liquid (FL) theory to include spin-orbit (SO) splitting of the energy bands, focusing on the Rashba SO coupling as an example. We construct the phenomenological Landau interaction function for such a system using the symmetry arguments and verify this construction by an explicit perturbative calculation. The Landau function is used to obtain the effective mass, compressibility, and stability conditions of the FL. It is shown that although the charge-sector properties, such as the effective mass and compressibility, are determined solely by well-defined quasiparticles, the spin-sector properties, such as the spin susceptibility, contain a contribution from damped states in between the spin-split Fermi surfaces, and thus cannot be fully described by the FL theory, except for the case of weak SO coupling. We derive some specific properties of a chiral FL and show, in particular, that for contact interaction spin-splitting of the Fermi velocities of Rashba subbands occurs because of the Kohn anomaly, also modified by SO coupling.
description: 24 pages, 4 figures
Spontaneous Fermi surface deformation in the three-band Hubbard model: A variational Monte Carlo study
Creators: name: Zheng, Xiao-Jun
name: Huang, Zhong-Bing
name: Zou, Liang-Jian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We perform a variational Monte Carlo study on spontaneous d-wave form Fermi surface deformation ($d$FSD) within the three-band Hubbard model. It is found that the variational energy of a projected Fermi sea is lowered by introducing an anisotropy between the hopping integrals along the x and y directions. Our results show that the $d$FSD state has the strongest tendency at half-filling in the absence of magnetism, and disappears as the hole concentration increases to $n_h\approx 1.15$. This is qualitatively in agreement with the mean field analysis and the exact diagonalization calculation for the one-band models, and provides a qualitative explanation to the "intra-unit-cell" electronic nematicity revealed by the scanning tunneling microscopy. An analysis of the dependence of $d$FSD on the parameters of the three-band model indicates that the copper on-site Coulomb interaction, the nearest-neighbor copper-oxygen repulsion, and the charge-transfer energy have a remarkable positive effect on $d$FSD.
description: 6 pages, 7 figures
Asteroseismic classification of stellar populations among 13000 red giants observed by Kepler
Creators: name: Stello, D.
name: Huber, D.
name: Bedding, T. R.
name: Benomar, O.
name: Bildsten, L.
name: Elsworth, Y. P.
name: Gilliland, R. L.
name: Mosser, B.
name: Paxton, B.
name: White, T. R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Of the more than 150000 targets followed by the Kepler Mission, about 10% were selected as red giants. Due to their high scientific value, in particular for Galaxy population studies and stellar structure and evolution, their Kepler light curves were made public in late 2011. More than 13000 (over 85%) of these stars show intrinsic flux variability caused by solar-like oscillations making them ideal for large scale asteroseismic investigations. We automatically extracted individual frequencies and measured the period spacings of the dipole modes in nearly every red giant. These measurements naturally classify the stars into various populations, such as the red giant branch, the low-mass (M/Msol < 1.8) helium-core-burning red clump, and the higher-mass (M/Msol > 1.8) secondary clump. The period spacings also reveal that a large fraction of the stars show rotationally induced frequency splittings. This sample of stars will undoubtedly provide an extremely valuable source for studying the stellar population in the direction of the Kepler field, in particular when combined with complementary spectroscopic surveys.
description: 6 page, 5 figures, accepted by ApJL
Life history and population dynamics of Daphnia in seven ephemeral pools in Red Rock Canyon, Nevada
Creators: name: Bowman, Priscilla Kathleen
Publisher: name: University of Nevada, Las Vegas
Year: 2008

description: Seven ephemeral rock pools in Red Rock Canyon, Nevada were visited bimonthly over twelve months and sampled for resident zooplankton species. Population dynamics and life history characteristics of two Daphnia species, D. pulex and D. obtusa were analyzed with incidental attention given to an additional cladoceran, Moina sp. Aspects of the physical, chemical and biological environment were measured and evaluated. The behavior of these daphnid populations appears to be driven by the extreme seasonality of rock pool ecosystems between episodic disturbances of drought and deluge. No causal relationships between Daphnia population size or patterns of temporal change and abiotic factors appear to exist. The availability and duration of water limits population growth. When conditions are favorable, rapid population growth apparently occurs via obligate parthenogenesis. This is the first systematic study of any Daphnia species in the Mojave Desert, or in any ephemeral aquatic habitat within a desert region.
Relationships between the groundwaters of Ash Meadows, Death Valley, Pahranagat Valley and the Nevada Test Site based on statistical analysis and modeling of trace element data
Creators: name: Cox, Sara Michelle
Publisher: name: University of Nevada, Las Vegas
Year: 2009

description: Relationships between the groundwaters of the Nevada Test Site, Ash Meadows, Pahranagat, and Death Valley have been studied by many people over many years. Using hydrogeochemical data from these areas (sampled and analyzed by the Harry Reid Center for Environmental Studies) hydrologic subbasins were classified on the basis of trace element concentrations and compare these to previous classification systems. In addition, previously suggested flow relationships were examined on the basis of trace element concentrations, in particular those elements which are thought to behave conservatively in oxidizing environments. These efforts were made with the aid of statistical analyses such as principal component analysis and contouring within ARC/INFO (a geographic information system). The spring and well water chemistry data includes major ion and trace element chemistry and was obtained from the Harry Reid Center for Environmental Studies at UNLV. In most analyses only trace elements were examined. Results of principal component analysis yielded logical results that reflect differences in geology and location. Perched waters on the Nevada Test Site have the most unique chemistries. Waters from the Furnace Creek region of Death Valley, Ash Meadows, and Pahranagat Valley seem to have many similarities with respect to trace elements. Contour modeling reveals that at least three processes or parameters control the behaviour of trace elements within the study area.
The petrogenesis of andesites produced during regional extension: Examples from the northern McCullough Range, Nevada and Xitle Volcano, Mexico
Creators: name: Boland, Kelly Ann
Publisher: name: University of Nevada, Las Vegas
Year: 2007

description: The northern McCullough Range andesites are calc-alkaline and contain phenocrysts of olivine, clinopyroxene, and plagioclase. Although the andesites are similar in major element chemistry, they exhibit wide variations in trace element chemistry. Resulting trace element Harker diagrams show considerable scatter and no discernible petrogenetic trends. On {dollar}\sp{87}{dollar}Sr/{dollar}\sp{86}{dollar}Sr and {dollar}\rm\varepsilon\sb{Nd}{dollar} isotope plots, however, andesites fall into 3 distinct groups: group A {dollar}\rm(\sp{87}Sr/\sp{86}Sr=0.70758{dollar} to 0.7077; {dollar}\rm\varepsilon\sb{Nd}=-6.2{dollar} to {dollar}-{dollar}6.9), group B {dollar}\rm(\sp{87}Sr/\sp{86}Sr=0.7081{dollar} to 0.7083; {dollar}\rm\varepsilon\sb{Nd}=-6.7{dollar} to {dollar}-{dollar}7.4), and group C {dollar}\rm(\sp{87}Sr/\sp{86}Sr=0.70897{dollar} to 0.70904; {dollar}\rm\varepsilon\sb{Nd}=-8.8{dollar} to {dollar}-{dollar}9.8). Geochemical variations, isotopic data and petrogenetic modeling suggest that the andesites in the northern McCullough Range formed primarily from mixing together several different andesitic sources (represented by isotope groups A, B, and C) that are similar in chemistry but isotopically distinct. This proposed model involving mixing of different andesitic end members explains the andesite dominated section observed in the McCullough Range and provides an alternative explanation for andesite petrogenesis in extensional terranes. A preliminary study of Xitle volcano in central Mexico shows similarities to the McCullough Range results. (Abstract shortened by UMI.).
Exploring the nature of new main-belt comets with the 10.4m GTC telescope: (300163) 2006 VW139
Creators: name: Licandro, J.
name: Moreno, F.
name: de León, J.
name: Tozzi, G. P.
name: Lara, L. M.
name: Cabrera-Lavers, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We aim to study the dust ejected by main-belt comet (MBC) (300163) 2006 VW139 to obtain information on the ejection mechanism and the spectral properties of the object, to see if they are compatible with those of "normal" comets. Images in the g and r band and a low-resolution spectrum in the 0.35-0.9 micron region were obtained with the GTC telescope (La Palma, Spain). Images were analyzed to produce a color map and derive a lower limit of the absolute magnitude. A Monte Carlo (MC) scattering model was used to derive dust properties such as mass loss rates and ejection velocities as a function of time. The spectrum was compared to that of MBC 133P/Elst-Pizarro and used to search for CN emission. The spectrum of 2006 VW139 is typical of a C-class asteroid, with a spectral slope S=0.5+/-1.0%/1000A. It is similar to the spectrum of 133P and other MBCs. No CN emission is detected. A CN production rate upper limit of 3.76e23 1/s is derived. The MBC present a narrow almost linear tail that extends up to 40.000 km in the anti-solar direction and more than 80.000 km in the direction of the object's orbital plane. The color of the tail is slightly redder than the Sun (S=3 to 6%/1000A). The MC dust tail model derived the mass loss rates and ejection velocity as a function of time, and the results show that the activity onset occurs shortly after perihelion, and lasts about 100 days; the total ejected mass is about 2e6 kg. The spectrum of VW139 suggests that it is not a "normal" comet. It is typical of the other observed MBCs. Even if no CN emission is detected, the more likely activation mechanism is water-ice sublimation. Like other well studied MBCs, VW139 is likely a primitive C-class asteroid that has a water-ice subsurface depth reservoir that has recently been exposed to sunlight or to temperatures that produce enough heat to sublime the ice.
description: 7 pages, 7 figures, accepted for publication Astronomy & Astrophysics 2012
Studying the Internal Ballistics of a Combustion Driven Potato Cannon using High-speed Video
Creators: name: Courtney, E. D. S.
name: Courtney, M. W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: A potato cannon was designed to accommodate several different experimental propellants and have a transparent barrel so the movement of the projectile could be recorded on high-speed video (at 2000 frames per second). Both combustion chamber and barrel were made of polyvinyl chloride (PVC). Five experimental propellants were tested: propane (C3H8), acetylene (C2H2), ethanol (C2H6O), methanol (CH4O), and butane (C4H10). The amount of each experimental propellant was calculated to approximate a stoichometric mixture and considering the Upper Flammability Limit (UFL) and the Lower Flammability Limit (LFL), which in turn were affected by the volume of the combustion chamber. Cylindrical projectiles were cut from raw potatoes so that there was an airtight fit, and each weighed 50 (+/- 0.5) grams. For each trial, position as a function of time was determined via frame by frame analysis. Five trials were taken for each experimental propellant and the results analyzed to compute velocity and acceleration as functions of time. Additional quantities including force on the potato and the pressure applied to the potato were also computed. For each experimental propellant, average velocity vs. barrel position curves were plotted. The most effective experimental propellant was defined as the one which accelerated the potato to the highest muzzle velocity. The experimental propellant acetylene performed the best on average (138.1 m/s), followed by methanol (48.2 m/s), butane (34.6 m/s), ethanol (33.3 m/s), and propane (27.9 m/s), respectively.
Hidden Photons in connection to Dark Matter
Creators: name: Andreas, Sarah
name: Goodsell, Mark D.
name: Ringwald, Andreas
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Light extra U(1) gauge bosons, so called hidden photons, which reside in a hidden sector have attracted much attention since they are a well motivated feature of many scenarios beyond the Standard Model and furthermore could mediate the interaction with hidden sector dark matter. We review limits on hidden photons from past electron beam dump experiments including two new limits from such experiments at KEK and Orsay. In addition, we study the possibility of having dark matter in the hidden sector. A simple toy model and different supersymmetric realisations are shown to provide viable dark matter candidates in the hidden sector that are in agreement with recent direct detection limits.
description: 4 pages, 2 figures, contribution to the proceedings of the PEB Workshop at MIT, Cambridge, March 14-16, 2013
WESC 2023 Mini-Symposium 1.5 "IEA Wind Task 52: Replacing met masts and Accelerating offshore wind deployment"
Creators: name: Gertjan, Glabeke
name: Thiébaut, Maxime
name: Cano, Luis
name: Kidambi, Anantha
name: Young, Matthew
name: Chen, Yiyin
Publisher: name: Zenodo
Year: 2023

description: The mini-symposium (coordinated by J. Gottschall and chaired by P. Clive) comprised the following individual presentations: "Introducing NEOWIND project: Next Generation of Offshore Wind Lidar Measurements" by Yiyin Chen, Stuttgart Wind Energy, University of Stuttgart "Anomalous wind events over the Belgian North Sea at heights relevant to wind energy" by Gertjan Glabeke, von Karman Institute For Fluid Dynamics "Quantification of the error induced by floating motions in wind vector and turbulence intensity estiation" by Maxime Thiébaut, France Energies Marines "Experimental results of the digitalization of wind flow with LIDAR for different application: met mast substitution, urban wind and Airborne" by Luis Cano, Ciemat "Analysing Data Availability as a Metric for Scanning Lidar Wind Resource Measurement Campaigns" by Anantha Padmanabhan Kidambi Sekar, Offshore Wind Consultants [see Analysing Data Availability as a Metric for Scanning Lidar Wind Resource Assessment Campaigns | Zenodo] "Verification of dual-scanning lidar for wind resource assessment: assessing turbulence, long-range and multiple height scanning" by Matthew Young, Oldbaum Services
title: Διαγράμματα ελέγχου για την παρακολούθηση της διασποράς
title: Control charts for monitoring processvariability
titleType: AlternativeTitle
Creators: name: Στουραΐτη, Δανάη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Διαγράμματα ελέγχου
subject: CUSUM
subject: Διασπορά
subject: EWMA

description: Τα διαγράμματα ελέγχου είναι ένα σημαντικό και ισχυρό εργαλείο σε μια προσπάθεια προς μια σταθερότερη παραγωγική διεργασία. Μέσω αυτών των διαγραμμάτων, μπορούν να ελεγχθούν πιθανές αποκλίσεις σε διάφορες παραμέτρους του προϊόντος, οι οποίες αν δεν προσδιοριστούν εγκαίρως, θα μπορούσαν ενδεχομένως να οδηγήσουν σε διεργασία εκτός ελέγχου. Η αποτελεσματική χρήση των διαγραμμάτων ελέγχου έχει ως αποτέλεσμα την παραγωγή προϊόντων βέλτιστης ποιότητας και την ελαχιστοποίηση της παραγωγής μη συμμορφούμενων προϊόντων. Συνήθως, χρησιμοποιούνται δύο τύποι διαγραμμάτων ελέγχου για μεταβλητές. Ένα διάγραμμα για την παρακολούθηση της μέσης τιμής της διεργασίας και ένα για την παρακολούθηση της μεταβλητότητας της διεργασίας. Η παρακολούθηση της μεταβλητότητας μιας διεργασίας έχει κερδίσει το ενδιαφέρον αρκετών επιστημόνων τις τελευταίες δεκαετίες. Η παρούσα διατριβή χωρίζεται σε τρία κεφάλαια. Στο πρώτο κεφάλαιο γίνεται περιγραφή των διαγραμμάτων ελέγχου για την παρακολούθηση της μέσης τιμής και της μεταβλητότητας μιας διεργασίας. Επιπλέον, παρουσιάζονται βασικά εργαλεία όπως το μέσο μήκος ροής καθώς και εκτιμήτριες της μέσης τιμής και της τυπικής απόκλισης που χρησιμοποιούνται στα διαγράμματα ελέγχου. Στο δεύτερο κεφάλαιο μελετώνται εκτενώς τα διαγράμματα ελέγχου τύπου Shewhart R και S τόσο με όρια ελέγχου 3σ όσο και με όρια πιθανότητας. Πραγματοποιείται σύγκριση της αποτελεσματικότητας των διαγραμμάτων ελέγχου R και S για την παρακολούθηση της μεταβλητότητας μιας διεργασίας για διάφορα μεγέθη δειγμάτων και για διάφορες μετατοπίσεις της τυπικής απόκλισης. Στο τρίτο κεφάλαιο μελετώνται αναλυτικά τα διαγράμματα CUSUM-S2 , CUSUM-lnS^2 , EWMA-S^2 και EWMA-lnS^2. Επίσης γίνεται σύγκριση όλων των διαγραμμάτων ελέγχου με μέτρο το μέσο μήκος ροής και εξάγονται συμπεράσματα για το ποιο διάγραμμα υπερτερεί σε μικρές και μεγάλες μετατοπίσεις της τυπικής απόκλισης.
WESC 2023 Mini-Symposium 1.5 "IEA Wind Task 52: Replacing met masts and Accelerating offshore wind deployment"
Creators: name: Gertjan, Glabeke
name: Thiébaut, Maxime
name: Cano, Luis
name: Kidambi, Anantha
name: Young, Matthew
Publisher: name: Zenodo
Year: 2023

description: The mini-symposium (coordinated by J. Gottschall and chaired by P. Clive) comprised the following individual presentations: "Introducing NEOWIND project: Next Generation of Offshore Wind Lidar Measurements" by Yiyin Chen, Stuttgart Wind Energy, University of Stuttgart [not uploaded yet] "Anomalous wind events over the Belgian North Sea at heights relevant to wind energy" by Gertjan Glabeke, von Karman Institute For Fluid Dynamics "Quantification of the error induced by floating motions in wind vector and turbulence intensity estiation" by Maxime Thiébaut, France Energies Marines "Experimental results of the digitalization of wind flow with LIDAR for different application: met mast substitution, urban wind and Airborne" by Luis Cano, Ciemat "Analysing Data Availability as a Metric for Scanning Lidar Wind Resource Measurement Campaigns" by Anantha Padmanabhan Kidambi Sekar, Offshore Wind Consultants [see Analysing Data Availability as a Metric for Scanning Lidar Wind Resource Assessment Campaigns | Zenodo] "Verification of dual-scanning lidar for wind resource assessment: assessing turbulence, long-range and multiple height scanning" by Matthew Young, Oldbaum Services
title: Εφαρμογή μεθόδων στατιστικής μηχανικής μάθησης στην ανάλυση κειμένων και εικόνων υγείας
title: Statistical machine learning used in health image and text analysis
titleType: AlternativeTitle
Creators: name: Αρβανιτόπουλος, Ιωάννης
name: Arvanitopoulos, Ioannis
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Machine learning
subject: Text mining
subject: Text classification
subject: Image classification
subject: Healthcare

description: Η παρούσα διπλωματική εργασία στόχο έχει να καλύψει ένα μεγάλο μέρος των τεχνικών προ επεξεργασίας δεδομένων κειμένων και εικόνων στον τομέα της υγείας, με σκοπό τη βελτίωση της απόδοσης των αλγορίθμων κατηγοριοποίησης αυτών σε προκαθορισμένες κατηγορίες. Για την κατηγοριοποίηση των κειμένων δοκιμάστηκαν τόσο τεχνικές μηχανικής μάθησης όσο και τεχνικές βαθιάς μηχανικής μάθησης. Στις τεχνικές μηχανικές μάθησης χρησιμοποιήθηκαν οι αλγόριθμοι Logistic Regression, Multinomial Naïve Bayes και Support Vector Machines (SVM). Τα αποτελέσματα αυτών συγκρίθηκαν και ο αλγόριθμος με την καλύτερη απόδοση βρέθηκε να είναι ο SVM με ακρίβεια κατηγοριοποίησης 88.98% Στις τεχνικές βαθιάς μηχανικής μάθησης χρησιμοποιηθήκαν αρχιτεκτονικές νευρωνικών δικτύων όπως Multilayer Perceptron και Convolutional Neural Network (CNN). Τα αποτελέσματα, αφού συγκρίθηκαν οι μέθοδοι μεταξύ τους, έδειξαν πως καλύτερη κατηγοριοποίηση των κειμένων επιτυγχάνει το δίκτυο Multilayer Perceptron με ακρίβεια κατηγοριοποίησης 84.85%. Η κατηγοριοποίηση εικόνων δοκιμάστηκε να επιτευχθεί με CNNs και Transfer Learning. Συγκεκριμένα ένα απλό CNN και ένα προ εκπαιδευμένο CNN γνωστό ως VGG16 δοκιμάστηκαν με καλύτερη απόδοση το VGG16 που πέτυχε ακρίβεια κατηγοριοποίησης 97.83%
Cu-Al2O3 hybrid nanofluid natural convection in an inclined enclosure with wavy walls partially layered by porous medium
Creators: name: Rona, Aldo
name: Kadhim, Hakim Tarteeb Kadhim
name: Jabbar, Faris A.
Publisher: name: figshare
Year: 2022
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering
subject: 91502 Computational Heat Transfer
subject: FOS: Other engineering and technologies
subject: 91505 Heat and Mass Transfer Operations
subject: 91501 Computational Fluid Dynamics

description: A parametric numerical investigation is performed of the natural convection and heat transfer in an enclosure with opposing wavy walls, layered by a porous medium, saturated by a hybrid nanofluid, at different inclination angles. The Galerkin finite element method is used to obtain steady-state solutions of the heat and mass convection laws by application of the semi-implicit method for pressure linked equations algorithm. The Darcy-Brinkman model is used for representing the state variables change in the porous layer. The influence of six parameters on the flow and heat transfer rate is described. These are the inclination angle, varied from 0o to 90o, the Rayleigh number (104 ≤ 𝑅𝑎 ≤ 107), the Darcy number (10-5 ≤ 𝐷𝑎 ≤ 10-2), the porous layer width (0.2 ≤ 𝑊p ≤ 0.8), the number of undulation (1≤ 𝑁 ≤ 4), and the nanoparticle volume fraction (0 ≤ 𝜙 ≤ 0.2). It is found that the inclination angle is a very influential control parameter for the hybrid nanofluid in the enclosure. Its effect is modulated by the other parameters. The model predicts that adding the nanoparticles enhances the heat transfer between the opposing walls of the cell compared to the pure fluid over the whole range of inclination angles. Finally, a comparison of the heat transfer enhancement based on the suspension of Al2O3 nanoparticles in water as a single nanofluid versus using Cu-Al2O3 nanoparticles in water as a hybrid nanofluid indicates better heat transfer performance by the hybrid nanofluid.
Modelos físicos y simulaciones numéricas - Un enfoque astrofísico
Creators: name: Romero, Raul Naranjo
Publisher: name: Zenodo
Year: 2022
Subjects: Astrofísica
Galaxias
Formación estelar
Simulaciónes MHD

description: Conceptos básicos de modelos físicos y el uso de simulaciones numéricas en astrofísica para el estudio de formación de galaxias y el proceso de formación estelar.
description: Conferencia impartida en el seminario de docencia de la Física, en el Centro de Investigación y enseñanza de las Matemáticas.
On oscillators in phyllosilicate excitable automata
Creators: name: Adamatzky, Andrew
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Phyllosilicate is a sheet of silicate tetrahedra bound by basal oxygens. A phyllosilicate excitable automaton is a regular network of finite state machines, which mimics structure of a silicate sheet. A node of the silicate sheet is an automaton, which takes resting, excited and refractory states, and updates its state in discrete time depending on a sum of excited states of its three (silicon automata) or six (oxygen automata) closest neighbours. Oscillator is a localised compact configuration of non-quiescent states which undergoes finite growth and modification but returns to its original state in a finite number of steps. We show that phyllosilicate excitable automata exhibit spiral and target waves, and oscillating localisation dynamics. Basic types of oscillators are classified and characterised.
Space-time symmetries and the Yang-Mills gradient flow
Creators: name: Del Debbio, Luigi
name: Patella, Agostino
name: Rago, Antonio
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The recent introduction of the gradient flow has provided a new tool to probe the dynamics of quantum field theories. The latest developments have shown how to use the gradient flow for the exploration of symmetries, and the definition of the corresponding renormalized Noether currents. In this paper we introduce infinitesimal translations along the gradient flow for gauge theories, and study the corresponding Ward identities. This approach is readily generalized to the case of gauge theories defined on a lattice, where the regulator breaks translation invariance. The Ward identities in this case lead to a nonperturbative renormalization of the energy-momentum tensor. We discuss an application of this method to the study of dilatations and scale invariance on the lattice.
description: 29 pages
Робота Наукової Ради з проблеми „Археологія і стародавня історія УРСР”
Creators: name: Кучера, Михайло
Publisher: name: figshare
Year: 2019
Subjects: Archaeology

description: Кучера, М. П. 1991. Робота Наукової Ради з проблеми «Археологія і стародавня історія УРСР». Археологія, 3, с. 138–141.
Field-theoretic technique for irreversible reaction processes
Creators: name: Hnatič, Michal
name: Honkonen, Juha
name: Lučivjanský, Tomáš
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The single-species annihilation reaction A+A->0 is studied in the presence of random advecting field. In order to determine possible infrared behavior of the system all stable fixed points are presented to two-loop approximation in double $(ε,Δ)$ expansion with the corresponding regions of stability. The main result of this paper is the calculation of all the renormalization constants and the decay exponent to the second-order precision as well as calculation of scaling function the mean particle number to the first order. Effects of random sources and sinks on reaction kinetics in the master-equation description have been investigated in the framework of a field-theoretic model, obtained by the "second quantization" a la Doi of the corresponding master equation. It has been demonstrated that random sources and sinks have a significant effect on the asymptotic behaviour of the model and two universality classes for their description have been identified by the scaling analysis. Results are compared with the Langevin-equation description of the same process.
description: to be published in Physics of Elementary Particles and Atomic Nuclei
title: Καινοτόμες δράσεις στα πλαίσια των προαιρετικών εκπαιδευτικών προγραμμάτων της αγωγής υγείας και περιβάλλοντος στην Πρωτοβάθμια Εκπαίδευση
title: Innovative actions within the optional educational programs of health and environmental education in Primary Education
titleType: AlternativeTitle
Creators: name: Κομνού, Ευγενία
name: Λουδάρου, Νεκταρία
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Καινοτόμες δράσεις
Αγωγή υγείας
Περιβαλλοντική αγωγή
Πρωτοβάθμια εκπαίδευση
Δημοτικό σχολείο
Νηπιαγωγείο
Εκπαιδευτικά προγράμματα
Σχολικός εκφοβισμός
Εξαρτησιογόνες ουσίες
Διατροφή
Σωματική άσκηση
Φροντίδα ζώων
Σχολικό περιβάλλον
Κλιματική αλλαγή
Φυσικές καταστροφές
Βιωματική μάθηση

description: Η παρούσα διπλωματική εργασία ενδιατρίβει σε καινοτόμες δράσεις αναφορικά με την Αγωγή Περιβάλλοντος και Υγείας, οι οποίες έχουν σχεδιαστεί στο εξωτερικό και υλοποιούνται σε σχολεία της Πρωτοβάθμιας Εκπαίδευσης, ήτοι Νηπιαγωγεία και Δημοτικά. Στην Ελλάδα οι δράσεις και τα προγράμματα αναφορικά με την Αγωγή Υγείας και την Αγωγή Περιβάλλοντος διαθέτουν αμιγώς προαιρετικό χαρακτήρα και δεν εμπίπτουν στις υποχρεώσεις των εκπαιδευτικών. Η παρούσα διπλωματική εργασία συνιστά έναν οδηγό για εκείνους τους εκπαιδευτικούς της Πρωτοβάθμιας Εκπαίδευσης, οι οποίοι επιθυμούν να διανθίσουν το εκπαιδευτικό τους έργο με πρωτότυπες, ευφάνταστες και καινοτόμες δράσεις στα πλαίσια της Αγωγής Υγείας και Περιβάλλοντος.
Multifractal age? Multifractal analysis of cardiac interbeat intervals in assessing of healthy aging
Creators: name: Makowiec, Danuta
name: Kryszewski, Stanisaw
name: Wdowczyk-Szulc, Joanna
name: Zarczynska-Buchowiecka, Marta
name: Gruchal, Marcin
name: Rynkiewicz, Andrzej
Publisher: name: arXiv
Year: 2013
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: 24-hour Holter recordings of 124 healthy people at different age are studied. The nocturnal signals of young people reveal the presence of the multiplicative structure. This structure is significantly weaker in diurnal signals and becomes less evident for elderly people. Multifractal analysis allows us to propose qualitative and quantitative methods to estimate the advancement of the aging process for healthy humans.
description: presented at 7th Conference of European Study Groups on Cardiovascular Oscillations
Дослідження Траянових валів у Середньому Подністров'ї
Creators: name: Кучера, Михайло
name: Пеняк, С.
Publisher: name: figshare
Year: 2019
Subjects: Archaeology

description: Кучера, М. П., Пеняк, С. П. 1991. Дослідження Траянових валів у Середньому Подністров’ї. В: Крижицький, С. Д. (відп. ред.). Археологічні дослідження на Україні у 1990 р. Київ: ІА АН УРСР, с. 37–38.
The phenomenology of panic disorder in adolescents
Creators: name: Allan, Wesley D
Publisher: name: University of Nevada, Las Vegas
Year: 2000

description: The Phenomenology of Panic Disorder in Adolescents examines correlates of panic disorder in adolescents. Specifically, 20 adolescents with panic disorder were compared with 20 adolescents with a non-panic anxiety disorder (e.g., overanxious disorder). Results showed that adolescents with panic disorder displayed higher levels of anxiety sensitivity (i.e., anxiety pertaining to the symptoms of anxiety such as heart palpitations). Based on the obtained results, anxiety sensitivity is proposed as a potentially critical variable in the examination of adolescent panic disorder.
title: Ταυτοποίηση μεταβολιτών οξυγαλακτικών βακτηρίων
title: Identification of lactic acid bacteria metabolites
titleType: AlternativeTitle
Creators: name: Λόκα, Κλαούντιο
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2022
Subjects: Βιοσυντήρηση
Προβιοτικά
Αντιοξειδωτικά

description: Η ζύμωση διαφόρων τροφίμων από τα βακτήρια του γαλακτικού οξέος αποτελεί μια από τις παλαιότερες μορφές βιοσυντήρησης, που εφαρμόζεται στην ανθρωπότητα. Οι ανταγωνιστικές σχέσεις μεταξύ των βακτηριών αποτελούν ένα φαινόμενο γνωστό για πάνω από έναν αιώνα, τα τελευταία, όμως, χρόνια έχουν λάβει περισσότερη επιστημονική προσοχή, ιδιαίτερα όσον αφορά τη χρήση διαφόρων στελεχών των βακτηρίων του γαλακτικού οξέος. Ένα κοινό χαρακτηριστικό πολλών οξυγλακτικών βακτηρίων αποτελεί η ικανότητα τους να παράγουν μεταβολίτες. Οι μεταβολίτες παρουσιάζουν διάφορες λειτουργίες μεταξύ των οποίων είναι και η αντιμικροβιακή τους δράση. Ουσίες, οι οποίες αποτελούν μεταβολίτες των οξυγαλακτικών βακτηρίων, είναι τα οργανικά οξέα, το διοξείδιο του άνθρακα, το υπεροξείδιο του υδρογόνου και οι ελεύθερες ρίζες, η ακεταλδεΰδη, το διακετύλιο, οι βακτηριοσίνες και ενώσεις μικρού μοριακού βάρους μη πρωτεϊνικής δομής. Τα τελευταία χρόνια το ενδιαφέρον γι’ αυτές τις ενώσεις έχει αυξηθεί σημαντικά λόγω της πιθανής χρήσης τους ως φυσικό υποκατάστατο των χημικών συντηρητικών, για την παραγωγή τροφίμων με αυξημένη διάρκεια ζωής ή/και ασφάλεια. Ο καταναλωτής, σήμερα, εκφράζει έντονα την επιθυμία του για συσχέτιση της διατροφής με την υγεία. Πρόσφατα επιστημονικά δεδομένα παρουσιάζουν τις θετικές επιδράσεις των προβιοτικών των οξυγαλακτικών βακτηρίων στην ανθρώπινη υγεία. Στόχος, λοιπόν, της παρούσας διπλωματικής εργασίας είναι η ταυτοποίηση των μεταβολιτών που παράγονται από ένα συγκεκριμένο οξυγαλακτικό βακτήριο, το Lactobacillus gasseri. μέσω υγρής χρωματογραφίας υψηλής πίεσης με ανιχνευτή συστοιχίας φωτοδιόδων που παρακολουθεί ταυτόχρονα όλο το φάσμα της περιοχής UV (HPLC-UV/DAD). Οι μεταβολίτες που ταυτοποιήθηκαν ανήκουν στα οργανικά οξέα. Με βάση τα αποτελέσματα αυτής της μελέτης, οι κύριοι μεταβολίτες που ανιχνεύθηκαν στο Lactobacillus gasseri ήταν DL-p-Hydroxyphenyllactic acid, 1,2-Dihydroxybenzene και Benzoic acid. Αυτή η μελέτη παρέχει μια διαφορετική εναλλακτικές προσεγγίσεις για τα μόρια που εμπλέκονται στην αντιμκροβιακή δράση των ζυμούμενων, από μικροοργανισμούς, τροφίμων. Αυτά τα μόρια μπορούν να χρησιμοποιηθούν ως αντιμικροβιακά συστατικά στη βιομηχανία τροφίμων αντί για τα συμβατικά χημικά συντηρητικά.
Design of fuzzy logic based adaptive traffic signal controller
Creators: name: Ande, Murali Mohan
Publisher: name: University of Nevada, Las Vegas
Year: 2005

description: Traffic control of street intersections is one of the most critical elements in providing an efficient flow of traffic in urban networks. Conventionally, pretimed controllers are used, but they cannot respond to real time fluctuations in traffic demand. Traffic actuated signals provide an improvement over pretimed controllers, but their performance deteriorates under heavy traffic conditions. These conditions necessitate the development of a controller that responds to actual traffic demand in real time, with the objective of minimizing vehicle delays, number of stops, etc. Fuzzy logic provides the potential for development of a system that would address these needs; The objective of this research is to design and evaluate a fuzzy logic based controller for traffic intersections that is adaptive to traffic demand. The design uses the standard input traffic flow parameters generated by existing loop detectors. The outcome of this research is a traffic controller that is very responsive to real-time traffic flow for various traffic simulations, including both recurring and non-recurring conditions. Evaluation of the performance of the system is based on minimization of delay and the number of stops. The performance of the fuzzy controller is compared to that of a pretimed controller with the help of traffic packages NETSIM & SOAP-84.
Exchange assisted tunneling and positron annihilation on inner atomic shells
Creators: name: Kozlov, M. G.
name: Flambaum, V. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Nuclear Theory (nucl-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is known for a long time that the long range asymptotic behavior of the Hartree-Fock orbitals is different from that of the orbitals in the local potential. However, there is no consensus about observable physical effects associated with this asymptotics. Here we argue that weaker decrease of the Hartree-Fock orbitals at large distances is responsible for the positron annihilation on the inner shell electrons, which is observed experimentally.
description: 8 pages, 3 figures, submitted to PRA
The Distance to the Massive Galactic Cluster Westerlund 2 from a Spectroscopic and HST Photometric Study
Creators: name: Alvarez, Carlos A. Vargas
name: Kobulnicky, Henry A.
name: Bradley, David R.
name: Kannappan, Sheila J.
name: Norris, Mark A.
name: Cool, Richard J.
name: Miller, Brendan P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a spectroscopic and photometric determination of the distance to the young Galactic open cluster Westerlund 2 using WFPC2 imaging from the Hubble Space Telescope and ground-based optical spectroscopy. HST imaging in the F336W, F439W, F555W, and F814W filters resolved many sources previously undetected in ground-based observations and yielded photometry for 1136 stars. We identified fifteen new O-type stars, along with two probable binary systems, including MSP 188 (O3 + O5.5). We fit reddened SEDs based on the Padova isochrones to the photometric data to determine individual reddening parameters $R_{V}$ and $A_{V}$ for O-type stars in Wd2. We find average values $\langle R_{V} \rangle = 3.77 \pm 0.09$ and $\langle A_{V} \rangle = 6.51 \pm 0.38$ mag, which result in a smaller distance than most other spectroscopic and photometric studies. After a statistical distance correction accounting for close unresolved binaries (factor of 1.08), our spectroscopic and photometric data on 29 O-type stars yield that Westerlund 2 has a distance $\langle d \rangle = 4.16 \pm 0.07$ (random) $+0.26$ (systematic) kpc. The cluster's age remains poorly constrained, with an upper limit of 3 Myr. Finally, we report evidence of a faint mid-IR PAH ring surrounding the well-known binary candidate MSP~18, which appears to lie at the center of a secondary stellar grouping within Westerlund 2.
description: 58 pages, 20 figures