cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Thermalization in closed quantum systems: semiclassical approach
Creators: name: Cosme, Jayson G.
name: Fialko, Oleksandr
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Thermalization in closed quantum systems can be explained either by means of the eigenstate thermalization hypothesis or the concept of canonical typicality. Both concepts are based on quantum mechanical formalism such as spectral properties of the eigenstates or entanglement between subsystems respectively. Here we study the onset of thermalization of Bose particles in a two-band double well potential using the truncated Wigner approximation. This allows us to use the familiar classical formalism to explain quantum thermalization in this system. In particular, we demonstrate that sampling of an initial quantum state plays the role of a statistical mechanical ensemble, while subsequent chaotic classical evolution turns the initial quantum state into the thermal state.
description: 4 pages, 10 figures, Accepted for publication in Physical Review A
Sequential time-window learning with approximate Bayesian computation: an application to epidemic forecasting
Creators: name: Valeriano, João Pedro
name: Cintra, Pedro Henrique
name: Libotte, Gustavo
name: Reis, Igor
name: Fontinele, Felipe
name: Silva, Renato
name: Malta, Sandra
Publisher: name: arXiv
Year: 2022
Subjects: subject: Methodology (stat.ME)
subject: Optimization and Control (math.OC)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Biological sciences

description: The long duration of the COVID-19 pandemic allowed for multiple bursts in the infection and death rates, the so-called epidemic waves. This complex behavior is no longer tractable by simple compartmental model and requires more sophisticated mathematical techniques for analyzing epidemic data and generating reliable forecasts. In this work, we propose a framework for analyzing complex dynamical systems by dividing the data in consecutive time-windows to be separately analyzed. We fit parameters for each time-window through an Approximate Bayesian Computation (ABC) algorithm, and the posterior distribution of parameters obtained for one window is used as the prior distribution for the next window. This Bayesian learning approach is tested with data on COVID-19 cases in multiple countries and is shown to improve ABC performance and to produce good short-term forecasting.
description: 12 pages, 7 figures; + supplementary material -- 31 pages
title: Health assessment findings for young males with severe emotional and behaviour difficulties in a residential setting over 24 weeks
Creators: name: Carroll, Denise
name: Duffy, T.
name: Martin, C. R.
Publisher: name: Strathprints - University of Strathclyde
Year: 2017

description: Seventy-four males aged 13-16 years old cared for by local authorities took part in this study when they were cared for in a Scottish residential centre for young people with severe emotional and behavioural difficulties. This group of vulnerable young people are known to have poor health, educational and social outcomes (Residential Care Health Project, 2004, Scottish Government, 2014). Children and young people in local authority care feature on the agenda of all aspects of public care including health, social care, criminal justice and education. It was found that 44% of the young people's health records were not available at the time of their health assessment despite the fact that young people had on average at least four previous placements prior to being admitted to the Centre. While a range of systems have been put in place to improve the health outcomes of children in care, lack of such key information may compromise the assessment process. Over three observations (at admission, 12 and 24 weeks) the young people had a comprehensive health assessment where some positive differences were found in dental intervention, vision problems, immunisation uptake, reduction in alcohol, substance use and sexual health concerns. Between the first and last assessment there was a decrease in the number of young people who have a healthy Body Mass Index (BMI).
Mind Perception Is the Essence of Morality
Creators: name: Young, Liane
name: Gray, Kurt
name: Waytz, Adam
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2012

description: Mind perception entails ascribing mental capacities to other entities, whereas moral judgment entails labeling entities as good or bad or actions as right or wrong. We suggest that mind perception is the essence of moral judgment. In particular, we suggest that moral judgment is rooted in a cognitive template of two perceived minds—a moral dyad of an intentional agent and a suffering moral patient. Diverse lines of research support dyadic morality. First, perceptions of mind are linked to moral judgments: dimensions of mind perception (agency and experience) map onto moral types (agents and patients), and deficits of mind perception correspond to difficulties with moral judgment. Second, not only are moral judgments sensitive to perceived agency and experience, but all moral transgressions are fundamentally understood as agency plus experienced suffering—that is, interpersonal harm—even ostensibly harmless acts such as purity violations. Third, dyadic morality uniquely accounts for the phenomena of dyadic completion (seeing agents in response to patients, and vice versa), and moral typecasting (characterizing others as either moral agents or moral patients). Discussion also explores how mind perception can unify morality across explanatory levels, how a dyadic template of morality may be developmentally acquired, and future directions.
The miniJPAS survey: White dwarf science with 56 optical filters
Creators: name: López-Sanjuan, C.
name: Tremblay, P. -E.
name: Ederoclite, A.
name: Ramió, H. Vázquez
name: Cenarro, A. J.
name: Marín-Franch, A.
name: Varela, J.
name: Akras, S.
name: Guerrero, M. A.
name: Jiménez-Esteban, F. M.
name: de Oliveira, R. Lopes
name: Chies-Santos, A. L.
name: Fernández-Ontiveros, J. A.
name: Abramo, R.
name: Alcaniz, J.
name: Benítez, N.
name: Bonoli, S.
name: Carneiro, S.
name: Cristóbal-Hornillos, D.
name: Dupke, R. A.
name: de Oliveira, C. Mendes
name: Moles, M.
name: Sodré, L.
name: Taylor, K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyze the white dwarf population in miniJPAS, the first square degree observed with 56 medium-band, 145 A in width optical filters by the Javalambre Physics of the accelerating Universe Astrophysical Survey (J-PAS), to provide a data-based forecast for the white dwarf science with low-resolution (R ~ 50) photo-spectra. We define the sample of the bluest point-like sources in miniJPAS with r < 21.5 mag, point-like probability larger than 0.5, (u-r) < 0.80 mag, and (g-i) < 0.25 mag. This sample comprises 33 sources with spectroscopic information, 11 white dwarfs and 22 QSOs. We estimate the effective temperature (Teff), the surface gravity, and the composition of the white dwarf population by a Bayesian fitting to the observed photo-spectra. The miniJPAS data permit the classification of the observed white dwarfs into H-dominated and He-dominated with 99% confidence, and the detection of calcium absorption and polluting metals down to r ~ 21.5 mag at least for sources with 7000 < Teff < 22000 K, the temperature range covered by the white dwarfs in miniJPAS. The effective temperature is estimated with a 2% uncertainty, close to the 1% from spectroscopy. A precise estimation of the surface gravity depends on the available parallax information. In addition, the white dwarf population at Teff > 7000 K can be segregated from the bluest extragalactic QSOs, providing a clean sample based on optical photometry alone. The J-PAS low-resolution photo-spectra provide precise and accurate effective temperatures and atmospheric compositions for white dwarfs, complementing the data from Gaia. J-PAS will also detect and characterize new white dwarfs beyond the Gaia magnitude limit, providing faint candidates for spectroscopic follow up.
description: Submitted to Astronomy and Astrophyscis. 12 pages, 9 figures, 4 tables. Comments are welcome
Comparison of fatty acid composition in grass-fed and grain-fed horse meat
Creators: name: Igenbayev, Aidyn
name: Amirkhanov, Shyngys
name: Muhtarbek Kakimov
name: Kanabekova, Alida
Publisher: name: Zenodo
Year: 2023
Subjects: horse meat, trans fatty acids, grain-fed, grass-fed

description: The objective of this research was to analyze the fatty acid composition of horse meat. The study involved the selection of two distinct groups of horses: 1) horses that were raised and fed in a pasture; 2) horses that were kept in stalls. This analysis compares the fatty acid composition of grass-fed and grain-fed horse meat, specifically in the loin cut. The data shows that grain-fed horse meat has a higher percentage of saturated fatty acids (SFA) compared to grass-fed horse meat, with the content being 40.32% and 37.43% respectively. Conversely, grass-fed horse meat has a higher percentage of monounsaturated fatty acids (MUFA) compared to grain-fed horse meat, with the content being 48.12% and 40.36% respectively. The percentage of polyunsaturated fatty acids (PUFA) is also higher in grain-fed horse meat compared to grass-fed horse meat, with the content being 19.31% and 14.44% respectively. This comparison suggests that the type of diet fed to horses can have a significant impact on the fatty acid composition of their meat. The higher content of SFAs in grain-fed horse meat may increase the risk of cardiovascular disease, while the higher content of MUFAs in grass-fed horse meat may have potential health benefits. The higher content of PUFAs in grain-fed horse meat may also be beneficial, as PUFAs are essential fatty acids that have been linked to a reduced risk of cardiovascular disease. However, the specific types of PUFAs present in grain-fed horse meat should be taken into consideration, as some types of PUFAs may be more beneficial than others. Further studies are needed to explore the health implications of consuming grass-fed vs. grain-fed horse meat.
Quadratic Coupling of the Axion to Photons
Creators: name: Beadle, Carl
name: Ellis, Sebastian A. R.
name: Quevillon, Jérémie
name: Vuong, Hoa
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2023
Subjects: quantum chromodynamics: axion
fine structure: time dependence
axion: parameter space
fundamental constant: fine structure
axion: coupling
dark matter: density
axion-like particles
kinetic
photon
electromagnetic
numerical calculations
axion: mass

description: We show that the QCD axion couples to the electromagnetic kinetic term at one loop. The result is that if axions make up dark matter, they induce temporal variation of the fine structure constant $\alpha$, which is severely constrained. We recast these constraints on the QCD axion parameter space. We also discuss how to generalise our finding to axion-like particles, and the resulting constraints.
Remnant mass, spin, and recoil from spin aligned black-hole binaries
Creators: name: Healy, James
name: Lousto, Carlos O.
name: Zlochower, Yosef
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We perform a set of 36 nonprecessing black-hole binary simulations with spins either aligned or counteraligned with the orbital angular momentum in order to model the final mass, spin, and recoil of the merged black hole as a function of the individual black hole spin magnitudes and the mass ratio of the progenitors. We find that the maximum recoil for these configurations is $V_{max}=526\pm23\,km/s$, which occurs when the progenitor spins are maximal, the mass ratio is $q_{max}=m_1/m_2=0.623\pm0.038$, the smaller black-hole spin is aligned with the orbital angular momentum, and the larger black-hole spin is counteraligned ($α_1=-α_2=1$). This maximum recoil is about $80\,km/s$ larger than previous estimates, but most importantly, because the maximum occurs for smaller mass ratios, the probability for a merging binary to recoil faster than $400\,km/s$ can be as large as $17\%$, while the probability for recoils faster than $250\, km/s$ can be as large as $45\%$. We provide explicit phenomenological formulas for the final mass, spin, and recoil as a function of the individual BH spins and the mass difference between the two black holes. Here we include terms up through fourth-order in the initial spins and mass difference, and find excellent agreement (within a few percent) with independent results available in the literature. The maximum radiated energy is $E_{\rm rad}/m\approx11.3\%$ and final spin $α_{\rm rem}^{\rm max}\approx0.952$ for equal mass, aligned maximally spinning binaries.
description: 19 pages, 25 figures, revtex 4
Mindfulness Broadens Awareness and Builds Eudaimonic Meaning: A Process Model of Mindful Positive Emotion Regulation
Creators: name: Farb, Norman A.
name: R. Goldin, Philippe
name: Fredrickson, Barbara L.
name: Garland, Eric L.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2015

description: Contemporary scholarship on mindfulness casts it as a form of purely non-evaluative engagement with experience. Yet, traditionally mindfulness was not intended to operate in a vacuum of dispassionate observation, but was seen as facilitative of eudaimonic mental states. In spite of this historical context, modern psychological research has neglected to ask the question of how the practice of mindfulness affects downstream emotion regulatory processes to impact the sense of meaning in life. To fill this lacuna, here we describe the Mindfulness-to-Meaning Theory, from which we derive a novel process model of mindful positive emotion regulation informed by affective science, in which mindfulness is proposed to introduce flexibility in the generation of cognitive appraisals by enhancing interoceptive attention, thereby expanding the scope of cognition to facilitate reappraisal of adversity and savoring of positive experience. This process is proposed to culminate in a deepened capacity for meaning-making and greater engagement with life.
The effects of a far-infrared photon cavity field on the magnetization of a square quantum dot array
Creators: name: Gudmundsson, Vidar
name: Mughnetsyan, Vram
name: Abdullah, Nzar Rauf
name: Tang, Chi-Shung
name: Moldoveanu, Valeriu
name: Manolescu, Andrei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The orbital and spin magnetization of a cavity-embedded quantum dot array defined in a GaAs heterostructure are calculated within quantum-electrodynamical density-functional theory (QEDFT). To this end a gradient-based exchange-correlation functional recently employed for atomic systems is adapted to the hosting two-dimensional electron gas (2DEG) submitted to an external perpendicular homogeneous magnetic field. Numerical results reveal the polarizing effects of the cavity photon field on the electron charge distribution and nontrivial changes of the orbital magnetization. We discuss its intertwined dependence on the electron number in each dot, and on the electron-photon coupling strength. In particular, the calculated dispersion of the photon-dressed electron states around the Fermi energy as a function of the electron-photon coupling strength indicates the formation of magnetoplasmon-polaritons in the dots.
description: RevTeX - pdfLaTeX, 12 pages with 9 included pdf figures
The ${\mathcal O}(\alpha_t+\alpha_\lambda+\alpha_\kappa)^2$ Correction to the $\rho$ Parameter and its Effect on the W Boson Mass Calculation in the Complex NMSSM
Creators: name: Dao, Thi Nhung
name: Gabelmann, Martin
name: Mühlleitner, Margarete
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2023
Subjects: boson, mass
CP, violation
supersymmetry, correction
Higgs particle, mass
muon, magnetic moment
correction, higher-order
scale, renormalization
minimal supersymmetric standard model
electroweak interaction
computer

description: We present the prediction of the electroweak $\rho$ parameter and the $W$ boson mass in the CP-violating Next-to-Minimal Supersymmetric extension of the Standard Model (NMSSM) at the two-loop order. The $\rho$ parameter is calculated at the full one-loop and leading and sub-leading two-loop order $\mathcal{O}(\alpha + \alpha_t\alpha_s + \left(\alpha_t+\alpha_\lambda+\alpha_\kappa\right)^2)$. The new $\Delta \rho$ prediction is incorporated into a prediction of $M_W$ via a full supersymmetric (SUSY) one-loop calculation of $\Delta r$. Furthermore, we include all known state-of-the-art SM higher-order corrections to $\Delta r$. By comparing results for $\Delta \rho$ obtained using on-shell (OS) and $\overline{\mathrm{DR}}$ renormalization conditions in the top/stop sector, we find that the scheme uncertainty is reduced at one-loop order by 55%, at two-loop $\mathcal{O}(\alpha_s\alpha_t)$ by 22%, and at two-loop $\mathcal{O}(\alpha_t+\alpha_\kappa+\alpha_\lambda)^2$ by 16%, respectively. The influence of the two-loop results on the $M_W$ mass prediction is found to be sub-leading. The new calculation is made public in the computer program $\mathrm{\tt NMSSMCALC}$. We perform an extensive comparison in the $W$-mass, Higgs boson mass and the muon anomalous magnetic moment prediction between our calculation and three other publicly available tools and find very good agreement provided that the input parameters and renormalization scales are treated in the same way. Finally, we study the impact of the CP-violating phases on the $W$-mass prediction which is found to be smaller than the overall size of the SUSY corrections.
Patterns of remission, continuation and incidence of broadly defined eating disorders during early pregnancy in the Norwegian Mother and Child Cohort Study (MoBa)
Creators: name: REICHBORN-KJENNERUD, TED
name: STOLTENBERG, CAMILLA
name: VON HOLLE, ANN
name: KNOPH BERG, CECILIE
name: BULIK, CYNTHIA M.
name: SULLIVAN, PATRICK
name: HAMER, ROBERT
name: TORGERSEN, LEILA
name: SIEGA-RIZ, ANNA MARIA
name: MAGNUS, PER
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2007

description: We explored the course of broadly defined eating disorders during pregnancy in the Norwegian Mother and Child Cohort Study (MoBa) at the Norwegian Institute of Public Health.
Enabling matter power spectrum emulation in beyond-$Λ$CDM cosmologies with COLA
Creators: name: Brando, Guilherme
name: Fiorini, Bartolomeo
name: Koyama, Kazuya
name: Winther, Hans A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We compare and validate COLA (COmoving Lagrangian Acceleration) simulations against existing emulators in the literature, namely Bacco and Euclid Emulator 2. Our analysis focuses on the non-linear response function, i.e., the ratio between the non-linear dark matter power spectrum in a given cosmology with respect to a pre-defined reference cosmology, which is chosen to be the Euclid Emulator 2 reference cosmology in this paper. We vary three cosmological parameters, the total matter density, the amplitude of the primordial scalar perturbations and the spectral index. By comparing the COLA non-linear response function with those computed from each emulator in the redshift range $0 \leq z \leq 3$, we find that the COLA method is in excellent agreement with the two emulators for scales up to $k \sim 1 \ h$/Mpc as long as the deviations of the matter power spectrum from the reference cosmology are not too large. We validate the implementation of massive neutrinos in our COLA simulations by varying the sum of neutrino masses to three different values, $0.0$ eV, $0.058$ eV and $0.15$ eV. We show that all three non-linear prescriptions used in this work agree at the $1\%$ level at $k \leq 1 \ h$/Mpc. We then introduce the Effective Field Theory of Dark Energy in our COLA simulations using the $N$-body gauge method. We consider two different modified gravity models in which the growth of structure is enhanced or suppressed at small scales, and show that the response function with respect to the change of modified gravity parameters depends weakly on cosmological parameters in these models.
description: 29 pages, 15 figures, Comments are welcome. Version accepted by JCAP
Gott: Erfahrung und Geheimnis
Creators: name: Jeanrond, Werner G.
name: Theobald, Christoph
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 37 Nr. 1 (2001): Concilium: Internationale Zeitschrift für Theologie, Band 37, Heft 1
Unitarity Problems for an Effective Field Theory Description of Early Universe Cosmology
Creators: name: Brandenberger, Robert
name: Kamali, Vahid
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the context of Effective Field Theory, the Hilbert space of states increases in an expanding universe. Hence, the time evolution cannot be unitary. The formation of structure is usually studied using effective field theory techniques. We study the constraints on effective field theory analyses of early universe models which come from demanding that the factor of the space of states corresponding to length scales where the primordial fluctuations are manifest does not suffer from the unitarity problem. For bouncing and emergent cosmologies, no constraints arise provided that the energy scale of the bounce or emergent phases is smaller than the ultraviolet (UV) cutoff scale. On the other hand, in the case of the inflationary scenario, non-trivial upper bounds on the energy scale of inflation arise.
description: 8 pages
Snus use and other correlates of smoking cessation in the Swedish Twin Registry
Creators: name: Lerman, C.
name: Sullivan, P. F.
name: Bulik, C. M.
name: Pedersen, N. L.
name: Furberg, H.
name: Lichtenstein, P.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2008

description: We investigated 12 variables and their interactions as correlates of smoking cessation among regular smokers in the population-based Swedish Twin Registry (STR).
User-friendly, theory-based web applet for rapidly predicting structure and thermodynamics of complex fluids
Creators: name: Popp, Theodore R.
name: Hollingshead, Kyle B.
name: Truskett, Thomas M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Based on a recently introduced analytical strategy [Hollingshead et al., J. Chem. Phys. 139, 161102 (2013)], we present a web applet that can quickly and semi-quantitatively estimate the equilibrium radial distribution function and related thermodynamic properties of a fluid from knowledge of its pair interaction. We present a detailed description of the applet's features and intended workflow, followed by a description of how the applet can be used to illustrate two (of many possible) concepts of interest for introductory statistical mechanics courses: the transition from ideal gas-like behavior to correlated-liquid behavior with increasing density and the tradeoff between dominant length scales with changing temperature in a system with ramp-shaped repulsions. The latter type of interaction qualitatively captures distinctive thermodynamic properties of liquid water because its energetic bias toward locally open structures mimics that of water's hydrogen-bond network.
High-Energy Extragalactic Neutrino Astrophysics
Creators: name: Kurahashi, Naoko
name: Murase, Kohta
name: Santander, Marcos
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The detection of an astrophysical flux of neutrinos in the TeV-PeV energy range by the IceCube observatory has opened new possibilities for the study of extreme cosmic accelerators. The apparent isotropy of the neutrino arrival directions favors an extragalactic origin for this flux, potentially created by a large population of distant sources. Recent evidence for the detection of neutrino emission from extragalactic sources include the active galaxies TXS 0506+056 and NGC 1068. We here review the current status of the search for the sources of the high-energy neutrino flux, concentrating on its extragalactic contribution. We discuss the implications of these observations for multimessenger studies of cosmic sources and present an outlook for how additional observations by current and future instruments will help address fundamental questions in the emerging field of high-energy neutrino astronomy.
description: 24 pages, 5 figures, 1 table, invited review article accepted for publication in ARNPS
title: Studying the impact of social media on brand performance
title: Μελέτη της επίδρασης των μέσων κοινωνικής δικτύωσης στην απόδοση μιας μάρκας
Creators: name: Ξυλουρης Νικολαος-Μιχαηλ
Publisher: name: Technical University of Crete
Year: 2023

description: Το θέμα της παρούσας διπλωματικής εργασίας, είναι η μελέτη της επίδρασης των μέσων κοινωνικής δικτύωσης (ΜΚΔ), στην εικόνα και στην απόδοση της επιχείρησης.
Σύμφωνα με τις πιο πρόσφατες μελέτες ο μέσος χρήστης του διαδικτύου ξοδεύει δύο και πλέον ώρες την ημέρα στα ΜΚΔ. Επιπλέον οι νέες κοινωνικό-οικονομικές συνθήκες που διαμορφώθηκαν κατά την διάρκεια της πανδημίας του covid-19 και έπειτα, επιτάχυναν την ψηφιοποίηση όλο και περισσότερων διαδικασιών και γενικότερα την διείσδυση του διαδικτύου στην καθημερινότητα μας. Από τα παραπάνω μπορούμε να συμπεράνουμε ότι ο ρόλος των ΜΚΔ γίνεται όλο και πιο σημαντικός στην σύγχρονη κοινωνία. Παράλληλα λόγω του σχετικά μικρού χρονικού διαστήματος που έχει παρέλθει από την διαμόρφωση των νεών συνθηκών, δεν έχουν ερευνηθεί εκτενώς οι διαφορές που προέκυψαν στον τρόπο με τον οποίο οι χρήστες στην Ελλάδα και παγκοσμίως αλληλοεπιδρούν με τα ΜΚΔ. Λαμβάνοντας λοιπόν υπόψιν τον αναβαθμισμένο ρόλο που εκτιμάται ότι θα διαδραματίσουν τα ΜΚΔ σαν μέσα προώθησης προϊόντων σε συνδυασμό με την ανεπαρκή διεύρυνσή του θέματος στη χώρα μας, κρίθηκε ότι είναι αρκετά χρήσιμο και επίκαιρο να εκπονηθεί η συγκεκριμένη διπλωματική εργασία.
Αρχικά λοιπόν μελετήθηκε η σημασία των ΜΚΔ και η επίδραση τους στην εικόνα της επιχείρησης. Παράλληλα παρουσιάστηκαν και αξιολογήθηκαν τα πλεονεκτήματα και πιθανά μειονεκτήματα από την χρήση των ΜΚΔ σαν μέσο προώθησης και βελτίωσης της εικόνας της επιχείρησης. Στην συνέχεια εξετάστηκε η επίδραση της δύναμης της εικόνας της επιχείρησης στις αντιλήψεις του στοχοθετημένου κοινού της ενώ αναλύθηκε η ανάγκη μελέτης της ψυχολογίας του κοινού αυτού. Επιπρόσθετα
παρουσιάσθηκαν τρόποι σύνδεσης της επιχείρησης με το στοχοθετημένο της κοινό. Έπειτα αναλύθηκαν οι πλέον δημοφιλείς πλατφόρμες ΜΚΔ και συζητήθηκε η καταλληλότητα χρήσης τους αναλόγως τον σχεδιασμό παραγωγής και εμπορίας της επιχείρησης. Στη συνέχεια αναλύθηκαν τα μοντέλα μάρκετινγκ 4p και 4c. Τέλος μελετήθηκε η επίδραση των ΜΚΔ στην εικόνα της εταιρίας Apple, η οποία μελετήθηκε σαν case study, κάνοντας εφαρμογή των μοντέλων μάρκετινγκ 4p και 4c. Η μεθοδολογία που ακολουθήθηκε στην εργασία περιλαμβάνει βιβλιογραφική ανασκόπηση του θέματος και μελέτη περίπτωσης (case study).
Τα συμπεράσματα που προέκυψαν από την παρούσα εργασία μπορούν να χρησιμοποιηθούν από επιχειρήσεις οι οποίες χρησιμοποιούν τα ΜΚΔ σαν μέσο προώθησης της εταιρικής τους εικόνας όπως επίσης και σαν βιβλιογραφία για νέες μελέτες πάνω στο αντικείμενο.
A population-based twin study of functional somatic syndromes
Creators: name: Pedersen, N. L.
name: Evengård, B.
name: Kato, K.
name: Sullivan, P. F.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2009

description: The mechanisms underlying the co-occurrence of the functional somatic syndromes are largely unknown. No empirical study has explicitly examined how genetic and environmental factors influence the comorbidity of these syndromes. We aimed to examine how the comorbidity of functional somatic syndromes is influenced by genetic and environmental factors that are in common to the syndromes.
Field Equation of Correlation Function of Mass Density Fluctuation for Self-Gravitating Systems
Creators: name: Zhang, Yang
name: Chen, Qing
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the mass density distribution of the Newtonian self-gravitating system. Modeling the system either as a gas in thermal equilibrium, or as a fluid in hydrostatical equilibrium, we obtain the field equation of correlation function $ξ(r)$ of the mass density fluctuation itself. It can apply to the study of galaxy clustering on Universe large scales. The observed $ξ(r)\simeq (r_0/r)^{1.7}$ follows from first principle. The equation tells that $ξ(r)$ depends on the point mass $m$ and Jeans wavelength scale $λ_{0}$, which are different for galaxies and clusters. It explains several longstanding, prominent features of the observed clustering: the profile of $ξ_{cc}(r)$ of clusters is similar to $ξ_{gg}(r)$ of galaxies but with a higher amplitude and a longer correlation length, the correlation length increases with the mean separation between clusters $r_0\simeq 0.4d$ as the observed scaling, and on very large scales $ξ_{cc}(r)$ exhibits periodic oscillations with a characteristic wavelength $\sim 120$Mpc. With a set of fixed model parameters, the solution $ξ(r)$ for galaxies and for clusters, the power spectrum, the projected, and the angular correlation function, simultaneously agree with the observational data from the surveys, such as Automatic Plate Measuring (APM), Two-degree-Field Galaxy Redshift Survey (2dFGRS), and Sloan Digital Sky Survey (SDSS), etc.
description: 29 pages, 9 figures
Monolepton production in SMEFT to $\mathcal O(1/Λ^4)$ and beyond
Creators: name: Kim, Taegyun
name: Martin, Adam
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate $pp \to \ell^{+}ν, \ell^-\bar ν$ to ${\cal{O}}(1/Λ^4)$ within the Standard Model Effective Field Theory (SMEFT) framework. In particular, we calculate the four-fermion contribution from dimension six and eight operators, which dominates at large center of mass energy. We explore the relative size of the $\mathcal O(1/Λ^4)$ and $\mathcal O(1/Λ^2)$ results for various kinematic regimes and assumptions about the Wilson coefficients. Results for Drell-Yan production $pp \to \ell^+\ell^-$ at ${\cal{O}}(1/Λ^4)$ are also provided. Additionally, we develop the form for four fermion contact term contributions to $pp \to \ell^{+}ν, \ell^-\bar ν, pp \to \ell^+\ell^-$ of arbitrary mass dimension. This allows us to estimate the effects from even higher dimensional (dimension $> 8$) terms in the SMEFT framework.
Assessing the heritability of anorexia nervosa symptoms using a marginal maximal likelihood approach
Creators: name: Mitchell, K. S.
name: Reichborn-Kjennerud, T.
name: Mazzeo, S. E.
name: Bulik, C. M.
name: Neale, M. C.
name: Kendler, K. S.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2009

description: Assessment of eating disorders at the symptom level can facilitate the refinement of phenotypes. We examined genetic and environmental contributions to liability to anorexia nervosa (AN) symptoms in a population-based twin sample using a genetic common pathway model.
Community Knowledge-Based Assessment of Smallholder Farmers' Perception of Cluster Farming and its Potential Role in Sustainable Accessibility to Farmer-Centric Support in Nigeria
Creators: name: Hamzat, Azeez Adewale
Publisher: name: Zenodo
Year: 2023
Subjects: Cluster Farming
Smallholder Farmers
Farmer-centric Support
Deliberative Surveys
Collaboration
Extension Services,
Efficiency
SDG 2
Nigeria

description: This is Master's thesis in Collective Intelligence on Community Knowledge-Based Assessment of Smallholder Farmers’ Perception of Cluster Farming and its Potential Role in Sustainable Accessibility to Farmer-Centric Support in Nigeria
A new sub-stellar companion around the young star HD 284149
Creators: name: Bonavita, Mariangela
name: Daemgen, Sebastian
name: Desidera, Silvano
name: Jayawardhana, Ray
name: Janson, Markus
name: Lafreniere, David
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Even though only a handful of sub-stellar companions have been found via direct imaging, each of these discoveries has had a tremendous impact on our understanding of the star formation process and the physics of cool atmospheres. Young stars are prime targets for direct imaging searches for planets and brown dwarfs, due to the favorable brightness contrast expected at such ages and also because it is often possible to derive relatively good age estimates for these primaries. Here we present the direct imaging discovery of HD 284149 b, a 18-50 M_Jup companion at a projected separation of 400 AU from a young (25 Myr) F8 star, with which it shares common proper motion
description: 5 pages, 3 figures
Gyrokinetic particle-in-cell simulations of electromagnetic turbulence in the presence of fast particles and global modes
Creators: name: Mishchenko, A.
name: Bottino, A.
name: Hayward-Schneider, T.
name: Poli, E.
name: Wang, X.
name: Kleiber, R.
name: Borchardt, M.
name: Nuehrenberg, C.
name: Biancalani, A.
name: Koenies, A.
name: Lanti, E.
name: Lauber, Ph.
name: Hatzky, R.
name: Vannini, F.
name: Villard, L.
name: Widmer, F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Global simulations of electromagnetic turbulence, collisionless tearing modes, and Alfven Eigenmodes in the presence of fast particles are carried out using the gyrokinetic particle-in-cell codes ORB5 (E. Lanti et al, Comp. Phys. Comm., ${\bf 251}$, 107072 (2020)) and EUTERPE (V. Kornilov et al, Phys. Plasmas, ${\bf 11}$, 3196 (2004)) in tokamak and stellarator geometries. Computational feasibility of simulating such complex coupled systems is demonstrated.
Short effective intervals containing primes
Creators: name: Kadiri, Habiba
name: Lumley, Allysa
Publisher: name: arXiv
Year: 2014
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11M06, 11M26

description: We prove that if $x$ is large enough, namely $x\ge x_0$, then there exists a prime between $x(1- Δ^{-1})$ and $x$, where $Δ$ is an effective constant computed in terms of $x_0$. This improves some previous results of Ramaré and Saouter and is used to verify the Ternary Goldbach Conjecture for the integers up to $7.86\cdot 10^{27}$.
description: to appear in Integers
A twin study of specific bulimia nervosa symptoms
Creators: name: Kendler, K. S.
name: Aggen, S. H.
name: Mazzeo, S. E.
name: Bulik, C. M.
name: Mitchell, K. S.
name: Neale, M. C.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: Twin studies have suggested that additive genetic factors significantly contribute to liability to bulimia nervosa (BN). However, the diagnostic criteria for BN remain controversial. In this study, an item-factor model was used to examine the BN diagnostic criteria and the genetic and environmental contributions to BN in a population-based twin sample. The validity of the equal environment assumption (EEA) for BN was also tested.
Binge eating disorder: a symptom-level investigation of genetic and environmental influences on liability
Creators: name: Mitchell, K. S.
name: Aggen, S. H.
name: Kendler, K. S.
name: Mazzeo, S. E.
name: Neale, M. C.
name: Bulik, C. M.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: Recent behavioral genetic studies have emphasized the importance of investigating eating disorders at the level of individual symptoms, rather than as overall diagnoses. We examined the heritability of binge eating disorder (BED) using an item-factor analytic approach, which estimates contributions of additive genetic (A), common environmental (C), and unique environmental (E) influences on liability to BED as well as individual symptoms.
Unsupervised Keyword Extraction from Polish Legal Texts
Creators: name: Jungiewicz, Michał
name: Łopuszyński, Michał
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: In this work, we present an application of the recently proposed unsupervised keyword extraction algorithm RAKE to a corpus of Polish legal texts from the field of public procurement. RAKE is essentially a language and domain independent method. Its only language-specific input is a stoplist containing a set of non-content words. The performance of the method heavily depends on the choice of such a stoplist, which should be domain adopted. Therefore, we complement RAKE algorithm with an automatic approach to selecting non-content words, which is based on the statistical properties of term distribution.
Integrating a ponderomotive guiding center algorithm into a quasi-static particle-in-cell code based on azimuthal mode decomposition
Creators: name: Li, Fei
name: An, Weiming
name: Tsung, Frank S.
name: Decyk, Viktor K.
name: Mori, Warren B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Accelerator Physics (physics.acc-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: High-fidelity modeling of plasma-based acceleration (PBA) requires the use of 3D fully nonlinear and kinetic descriptions based on the particle-in-cell (PIC) method. Three-dimensional PIC algorithms based on the quasi-static approximation (QSA) have been successfully applied to efficiently model the beam-plasma interaction. In a QSA-PIC algorithm, the plasma response to a charged particle beam or laser driver is calculated based on self-consistent forces from the QSA form of Maxwell's equations. These fields are then used to advance the charged particle beam or laser forward by a large time step. Since the time step is not limited by the regular Courant-Friedrichs-Lewy condition that constrains a standard 3D fully electromagnetic PIC code, a 3D QSA-PIC code can achieve orders of magnitude speedup in performance. Recently, a new hybrid QSA-PIC algorithm that combines another speedup technique known as azimuthal Fourier decomposition has been proposed and implemented. This hybrid algorithm decomposes the electromagnetic fields, charge and current density into azimuthal harmonics and only the Fourier coefficients need to be updated, which can significantly reduce the algorithmic complexity. Modeling the laser-plasma interaction in a full 3D PIC algorithm is very computationally expensive due to the enormous disparity of physical scales to be resolved. In the QSA the laser is modeled using the ponderomotive guiding center (PGC) approach. We describe how to implement a PGC algorithm compatible with the QSA PIC algorithms based on the azimuthal mode expansion. This algorithm permits time steps orders of magnitude larger than the cell size and it can be asynchronously parallelized. Details on how this is implemented into the QSA PIC code that utilizes an azimuthal mode expansion, QPAD, are also described.
A Robust and Accurate Adaptive Approximation Method for a Diffuse-Interface Model of Binary-Fluid Flows
Creators: name: Demont, T. H. B.
name: van Zwieten, G. J.
name: Diddens, C.
name: van Brummelen, E. H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We present an adaptive simulation framework for binary-fluid flows, based on the Abels-Garcke-Grün Navier-Stokes-Cahn-Hilliard (AGG NSCH) diffuse-interface model. The adaptive-refinement procedure is guided by a two-level hierarchical a-posteriori error estimate, and it effectively resolves the spatial multiscale behavior of the diffuse-interface model. To improve the robustness of the solution procedure and avoid severe time-step restrictions for small-interface thicknesses, we introduce an $\varepsilon$-continuation procedure, in which the diffuse interface thickness ($\varepsilon$) are enlarged on coarse meshes, and the mobility is scaled accordingly. To further accelerate the computations and improve robustness, we apply a modified Backward Euler scheme in the initial stages of the adaptive-refinement procedure in each time step, and a Crank--Nicolson scheme in the final stages of the refinement procedure. To enhance the robustness of the nonlinear solution procedure, we introduce a partitioned solution procedure for the linear tangent problems in Newton's method, based on a decomposition of the NSCH system into its NS and CH subsystems. We conduct a systematic investigation of the conditioning of the monolithic NSCH tangent matrix and of its NS and CH subsystems for a representative 2D model problem. To illustrate the properties of the presented adaptive simulation framework, we present numerical results for a 2D oscillating water droplet suspended in air, and we validate the obtained results versus those of a corresponding sharp-interface model.
description: 42 pages, 12 figures
Comparison of social cognitive functioning in schizophrenia and high functioning autism: more convergence than divergence
Creators: name: Couture, S. M.
name: Hurley, R.
name: Penn, D. L.
name: Piven, J.
name: Losh, M.
name: Adolphs, R.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: Individuals with schizophrenia and individuals with high-functioning autism (HFA) seem to share some social, behavioral and biological features. Although marked impairments in social cognition have been documented in both groups, little empirical work has compared the social cognitive functioning of these two clinical groups.
Entwinement and the emergence of spacetime
Creators: name: Balasubramanian, Vijay
name: Chowdhury, Borun D.
name: Czech, Bartlomiej
name: de Boer, Jan
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is conventional to study the entanglement between spatial regions of a quantum field theory. However, in some systems entanglement can be dominated by "internal", possibly gauged, degrees of freedom that are not spatially organized, and that can give rise to gaps smaller than the inverse size of the system. In a holographic context, such small gaps are associated to the appearance of horizons and singularities in the dual spacetime. Here, we propose a concept of entwinement, which is intended to capture this fine structure of the wavefunction. Holographically, entwinement probes the entanglement shadow -- the region of spacetime not probed by the minimal surfaces that compute spatial entanglement in the dual field theory. We consider the simplest example of this scenario -- a 2d conformal field theory (CFT) that is dual to a conical defect in AdS3 space. Following our previous work, we show that spatial entanglement in the CFT reproduces spacetime geometry up to a finite distance from the conical defect. We then show that the interior geometry up to the defect can be reconstructed from entwinement that is sensitive to the discretely gauged, fractionated degrees of freedom of the CFT. Entwinement in the CFT is related to non-minimal geodesics in the conical defect geometry, suggesting a potential quantum information theoretic meaning for these objects in a holographic context. These results may be relevant for the reconstruction of black hole interiors from a dual field theory.
description: v2: Sec. 4.3 amended
The synchronization of elevators when not all passengers will ride the first-arriving elevator
Creators: name: Tanida, Sakurako
Publisher: name: arXiv
Year: 2022
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: The cluster motion of busy multiple elevators is considered to be one of the synchronization phenomena of autonomous oscillators. In this study, we used numerical simulations to quantitatively explore differences in the elevators' dynamics during down peaks under isolated and coupled conditions. We introduced the proportion of passengers who are set to ride the first-arriving elevator as a control parameter and investigated the behaviors of elevators when the proportions of those passengers and the inflow of passengers were varied. When we increased the inflow of passengers, the synchronization was promoted and the round-trip time increased. On the other hand, when we increased the proportion of those passengers, the synchronization was promoted while the round-trip time decreased. To elucidate the relationship between the parameters and dynamics and clarify the mechanism, we established simple mathematical models; First, we reproduced the round-trip time by a self-consistent equation considering the inflow of passengers and the proportion of passengers set to ride the first-arriving elevator. Then, we estimated an order parameter of the synchronization.
description: updated. (11 pages, 5 figures)
Genome-wide association studies: a primer
Creators: name: Corvin, A.
name: Sullivan, P. F.
name: Craddock, N.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: There have been nearly 400genome-wide association studies published since 2005. The GWAS approach has been exceptionally successful in identifying common genetic variants that predispose to a variety of complex human diseases and biochemical and anthropometric traits. Although this approach is relatively new, there are many excellent reviews of different aspects of the GWAS method. Here, we provide a primer, an annotated overview of the GWAS method with particular reference to psychiatric genetics. We dissect the GWAS methodology into its components and provide a brief description with citations and links to reviews that cover the topic in detail.
Patterns of co-morbidity of eating disorders and substance use in Swedish females
Creators: name: Lichtenstein, P.
name: Bulik, C. M.
name: Pedersen, N. L.
name: Thornton, L.
name: Root, T. L.
name: Pisetsky, E. M.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: Little is known about the association of eating disorder (ED) subtypes across multiple categories of substance use (SU) in population-based samples. We examined the association between EDs and SU in a large population-based sample.