cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Galactic Warps Induced By Cosmic Infall
Creators: name: Shen, Juntai
name: Sellwood, J. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent ideas for the origin and persistence of the warps commonly observed in disc galaxies have focused on cosmic infall. We present N-body simulations of an idealized form of cosmic infall onto a disc galaxy and obtain a warp that closely resembles those observed. The inner disc tilts remarkably rigidly, indicating strong cohesion due to self-gravity. The line of nodes of the warp inside $R_{26.5} ~ 4.5 \Rd$ is straight, while that beyond $R_{26.5}$ generally forms a loosely-wound, leading spiral in agreement with Briggs's rules. We focus on the mechanism of the warp and show that the leading spiral arises from the torques from the misaligned inner disc and its associated inner oblate halo. The fact that the line of nodes of most warps forms a leading spiral might imply that the disc mass is significant in the centre. If the line of nodes can be traced to very large radii in future observations, it may reveal information on the mass distribution of the outer halo. The warp is not strongly damped by the halo because the precession rate of the inner disc is slow and the inner halo generally remains aligned with the inner disc. Thus even after the imposed quadrupolar perturbation is removed, the warp persists for a few Gyrs, by which time another infall event can be expected.
description: Accepted for the publication of MNRAS; 15 pages, including 1 color and 18 blackwhite figures. A movie and the high resolution version are available at http://www.as.utexas.edu/~shen/warp/warps.html
Αναλυτική επιχειρηματικότητα των δεδομένων με τη χρήση του Power BI
Creators: name: Σπανού, Αλεξάνδρα Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Αναλυτική
Επιχειρηματικότητα
Επιχειρηματική Ανάλυση
Business
Analysis
Power BI

description: Τα τελευταία χρόνια όλο και περισσότερες επιχειρήσεις επενδύουν σε εργαλεία τεχνολογίας με σκοπό την ανάλυση κι αξιολόγηση των επιχειρηματικών δεδομένων που διατηρούν. Ο τομέας της Επιχειρηματικής Ευφυΐας έχει επηρεάσει σημαντικά όχι μόνο τις διαδικασίες της ανάλυσης των δεδομένων, αλλά και τις διαδικασίες των λήψεων αποφάσεων. Η προσπάθεια μετατροπής των δεδομένων σε πολύτιμη πληροφορία και κέρδος έχουν καταστήσει τη δημιουργία των αναφορών απαραίτητη σε έναν οργανισμό. Τέτοιες αναφορές δημιουργούνται με τη χρήση των εργαλείων της Επιχειρηματικής Ευφυΐας και περιλαμβάνουν την παρουσίαση των αποτελεσμάτων μιας εξέτασης-ανάλυσης δεδομένων που αφορούν είτε το παρόν είτε το μέλλον. Η παρούσα εργασία έχει ως αντικείμενο την παρουσίαση των τεχνολογιών που απαρτίζουν την Επιχειρηματική Ευφυΐα και των τεχνικών που χρησιμοποιεί. Ακόμη, πραγματοποιείται η δημιουργία αναφορών με τη χρήση του εργαλείου Power BI Desktop, εξετάζονται οι δυνατότητες που διαθέτει και πώς οι χρήστες μπορούν να τις αξιοποιήσουν ώστε να εξάγουν συμπεράσματα από τα επιχειρηματικά δεδομένα που εξετάζουν.
description: In recent years, more and more businesses have been investing in technology tools to analyze and evaluate their business data. Business Intelligence has significantly affected not only the processes of data analysis, but the decision-making processes too. The effort to convert the data into valuable information and profit has made the creation of reports essential to an organization. Such reports are generated using Business Intelligence tools and include the presentation of the results of a data analysis or examination that involves either the present or the future. The particular work aims at presenting the technologies that constitute the Business Intelligence and the techniques it uses. In addition, it includes the creation of reports using Power BI Desktop tool, the examination of the capabilities it has and how users can use them in order to draw conclusions from the business data they analyze.
Excitonic versus electron-hole liquid phases in Tm[Se,Te] compounds
Creators: name: Bronold, Franz X.
name: Fehske, Holger
name: Roepke, Gerd
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We discuss, from a theoretical point of view, excitonic phases at the pressure induced semiconductor-semimetal transition in $\rm TmSe_{0.45}Te_{0.55}$,focusing, in particular, on the stability against an electron-hole liquid. The electron-hole pair density parameter $r_s(E_g,T)$ is calculated within the quasi-static plasmon pole approximation as a function of temperature $T$ and energy gap $E_g$ and converted into $-E_g(r_s,T)$. A comparison of this quantity, which is the electron-hole pair chemical potential, with the exciton binding energy reveals that excitons should be suppressed in contrast to experimental evidence for excitonic phases. We suspect therefore inter-valley exciton scattering and exciton-phonon scattering to substantially stabilise excitons in $\rm TmSe_{0.45}Te_{0.55}$.
description: 4 pages, 4 figures, accepted to the proceedings of the ICM 2006 Satellite Workshop "Novel Pressure-induced Phenomena in Condensed Matter Systems (NP2CMS)", Fukuoka, Japan
Multiple energy-scales in vertex-frustrated mesospin systems
Creators: name: Stopfel, Henry
name: Arnalds, Unnar B.
name: Stein, Aaron
name: Hase, Thomas P. A.
name: Hjörvarsson, Björgvin
name: Kapaklis, Vassilios
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The interplay between topology and energy-hierarchy plays a vital role in the collective magnetic order in artificial ferroic systems. Here we investigate, experimentally, the effect of having one or two activation energies of interacting Ising-like magnetic islands -- mesospins -- in thermalized, vertex-frustrated lattices. The thermally arrested magnetic states of the elements were determined using synchrotron-based magnetic microscopy after cooling the samples from temperatures above the Curie temperature of the material. Statistical analysis of the correlations between mesospins across several length-scales, reveals changes in the magnetic order, reflecting the amount of ground state plaquettes realized for a vertex-frustrated lattice. We show that the latter depends on the presence, or not, of different activation energies.
description: 10 pages, 8 figures
Adjusting the pH of expired eosin dye by using either hydrocholic acid or glacial acetic acid to improve the efficiency of staining tissue.
Creators: name: Sumon Jungudomjaroen, Busaba Panyarachun
Publisher: name: Faculty of Medicine,Srinakharinwirot University
Year: 2008
Subjects: Eosin dye, pH, Hydrocholic acid, Glacial acetic acid

description: 2, 15, Journal of Medicine and Health Sciences
On the Frequency of Severe Terrorist Events
Creators: name: Clauset, Aaron
name: Young, Maxwell
name: Gleditsch, Kristian Skrede
Publisher: name: arXiv
Year: 2006
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: In the spirit of Richardson's original (1948) study of the statistics of deadly conflicts, we study the frequency and severity of terrorist attacks worldwide since 1968. We show that these events are uniformly characterized by the phenomenon of scale invariance, i.e., the frequency scales as an inverse power of the severity, P(x) ~ x^-alpha. We find that this property is a robust feature of terrorism, persisting when we control for economic development of the target country, the type of weapon used, and even for short time-scales. Further, we show that the center of the distribution oscillates slightly with a period of roughly tau ~ 13 years, that there exist significant temporal correlations in the frequency of severe events, and that current models of event incidence cannot account for these variations or the scale invariance property of global terrorism. Finally, we describe a simple toy model for the generation of these statistics, and briefly discuss its implications.
description: 32 pages, 9 figures, 3 tables. Pre-print version; journal version is available at Sage Publications (see DOI below)
Implications for First-Order Cosmological Phase Transitions from the Third LIGO-Virgo Observing Run
Creators: name: Romero, Alba
name: Martinovic, Katarina
name: Callister, Thomas A.
name: Guo, Huai-Ke
name: Martínez, Mario
name: Sakellariadou, Mairi
name: Yang, Feng-Wei
name: Zhao, Yue
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We place constraints on the normalized energy density in gravitational waves from first-order strong phase transitions using data from Advanced LIGO and Virgo's first, second and third observing runs. First, adopting a broken power law model, we place $95 \%$ confidence level upper limits simultaneously on the gravitational-wave energy density at 25 Hz from unresolved compact binary mergers, $Ω_{\rm CBC} < 6.1 \times 10^{-9}$, and strong first-order phase transitions, $Ω_{\rm BPL} < 4.4 \times 10^{-9}$. The inclusion of the former is necessary since we expect this astrophysical signal to be the foreground of any detected spectrum. We then consider two more complex phenomenological models, limiting at 25 Hz the gravitational-wave background due to bubble collisions to $Ω_{\rm pt} < 5.0\times 10^{-9}$ and the background due to sound waves to $Ω_{\rm pt} < 5.8\times10^{-9}$ at $95 \%$ confidence level for phase transitions occurring at temperatures above $10^8$GeV.
description: 7 pages, 3 figures, version published in Physical Review Letters
Exhaustive health assessment of tanneries and their workers in Hazaribagh slum, Dhaka, Bangladesh
Creators: name: Haidar, Mohamad K
name: Almeida, Patrick
name: Martins Dada
name: Islam, Mohammad Sofiul
name: Ghatak, Shanta
name: Gassier, Emilie
name: Wilkin, Jo
name: Masters, Pete
name: Kamalini Kamalini Lokuge
name: Caleo, Grazia M
Publisher: name: F1000Research
Year: 2015

description: Hazaribagh, a slum in Dhaka, Bangladesh, housing 185,639 people, contains 95% of the tanneries in Bangladesh, discharging yearly 21,600 m3 of untreated effluent in the Buringanga River, making it one of the most polluted places on earth. In the absence of data, health and risk profiling of the Hazaribagh tanneries and their workers was needed after a rapid assessment of factory workers in Kamrangirchar, a neighbouring slum, showed alarming occupational risk exposure and high rates of morbidity. Findings were intended to support Médecins Sans Frontières (MSF) in adapting and developing their occupational health (OH) intervention in Hazaribagh, provided by two OH clinics.Morbidity rates, lack of risk mitigation, and poor health-seeking behaviour reflect the poor knowledge of workers and extreme shortage of services. Health promotion campaigns should take into consideration risk mitigation measures, occupational hygiene, and health-seeking behaviour. MSF should reinforce systematic tetanus immunization in their OH clinics.
Distributional Gradient Matching for Learning Uncertain Neural Dynamics Models
Creators: name: Treven, Lenart
name: Wenk, Philippe
name: Dörfler, Florian
name: Krause, Andreas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Dynamical Systems (math.DS)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Differential equations in general and neural ODEs in particular are an essential technique in continuous-time system identification. While many deterministic learning algorithms have been designed based on numerical integration via the adjoint method, many downstream tasks such as active learning, exploration in reinforcement learning, robust control, or filtering require accurate estimates of predictive uncertainties. In this work, we propose a novel approach towards estimating epistemically uncertain neural ODEs, avoiding the numerical integration bottleneck. Instead of modeling uncertainty in the ODE parameters, we directly model uncertainties in the state space. Our algorithm - distributional gradient matching (DGM) - jointly trains a smoother and a dynamics model and matches their gradients via minimizing a Wasserstein loss. Our experiments show that, compared to traditional approximate inference methods based on numerical integration, our approach is faster to train, faster at predicting previously unseen trajectories, and in the context of neural ODEs, significantly more accurate.
description: Published at NeurIPS 2021
The preparation time in a scattering experiment
Creators: name: Bryant, Peter
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A quantum mechanical theory with time asymmetry intrinsic to states (or observables) features the concept of an initial time of the state and thus a preparation time of the physical system represented by the state. This special time is investigated in the context of scattering theory, where, in standard quantum mechanics, the physical meaning of a preparation time has remained obscure. In an experiment, the preparation time corresponds to an ensemble of times of scattering marking the times in the laboratory when one scattering projectile interacts with one target quantum.
description: To be published in Journal of Physics: Conference Series
EVLibSim: Ένα εργαλείο για τη διαχείριση και προσομοίωση των σταθμών φόρτισης των ηλεκτρικών οχημάτων με χρήση της βιβλιοθήκης EVLib
Creators: name: Καραποστολάκης, Σωτήριος Αγγελου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Προσομοίωση
Ηλεκτρικό όχημα
Σταθμός φόρτισης
Simulation
Electric vehicle
Charging station

description: Αντικείμενο της διπλωματικής είναι η επέκταση της προγραμματιστικής βιβλιοθήκης EVLib και η ανάπτυξη του εργαλείου προσομοίωσης EVLibSim. Στόχος του εργαλείου είναι η διεκπεραίωση των βασικών λειτουργιών των ηλεκτρικών οχημάτων, όπως είναι η φόρτιση, αλλαγή μπαταρίας, η αποφόρτιση και η επαγωγική φόρτιση που αποτελούν το βασικό κομμάτι της λειτουργικότητας της βιβλιοθήκης EVLib. Το εργαλείο είναι σχεδιασμένο να παρέχει τις λειτουργίες του σε επίπεδο σταθμού φόρτισης. Παρέχει τη δυνατότητα διαμόρφωσης του σταθμού φόρτισης με την ρύθμιση των διάφορων παραμέτρων του. Ο χρήστης μπορεί να προσθέσει όσους φορτιστές, αποφορτιστές, βοηθούς αλλαγής μπαταρίας και θέσεις στάθμευσης επιθυμεί. Υποστηρίζεται η ταυτόχρονη λειτουργία των προαναφερθέντων λειτουργιών. Επίσης παρέχεται η δυνατότητα αναμονής με την ύπαρξη μίας λίστας, της οποίας η διαχείριση γίνεται είτε αυτόματα είτε από το χρήστη. Παράλληλα, δύναται η αντιμετώπιση φαινομένων συμφόρησης με χρήση προχωρημένων τεχνικών όπως τιμολογιακές πολιτικές φόρτισης και βελτιστοποιημένα πλάνα φόρτισης. Τέλος ειδική μνεία πρέπει να γίνει στην πληθώρα των επιλογών πηγών ενέργειας που παρέχονται από την βιβλιοθήκη. Όλες οι προαναφερθέντες λειτουργίες απορρέουν από EVLib. Το λογισμικό αναπτύχθηκε με χρήση της αντικειμενοστραφούς γλώσσας προγραμματισμού Java. Για την διαπίστωση της αποτελεσματικότητας του ελέγχθηκε μέσω κατάλληλων εργαλείων και μέσω ελέγχων ενοποίησης
description: The objective of the dissertation is the extension of the EVLib programming library and the development of the EVLibSim. EVLibSim is a simulation tool to carry out the basic functions of electric vehicles, such as charging, battery change, discharging and inductive charging, which are the key parts of the EVLib functionality. The tool is designed to provide its functions in a charging station level. It provides the ability to configure the charging station by setting a number of various parameters. The user can add as many chargers, chargers, battery exchange handlers and parking slots as he wants. The simultaneous operation of the aforementioned functions is supported. It also supports the use of waiting queues, which are managed either automatically or manually. At the same time, it can handle traffic congestion by using advanced techniques such as charging pricing policies and optimized charging plans. Finally, a special reference should be made to the plethora of energy sources choices provided by the library. EVLibSim’s functionality derives from EVLib. The software has been developed using the object-oriented programming language Java. To ascertain the effectiveness of it, the software was tested by appropriate tools and through unit tests
Field Induced Staggered Magnetization and Magnetic Ordering in $Cu_2 (C_5 H_{12} N_2)_2 Cl_4$
Creators: name: Clemancey, M.
name: Mayaffre, H.
name: Berthier, C.
name: Horvatic, M.
name: Fouet, J. -B.
name: Miyahara, S.
name: Mila, F.
name: Chiari, B.
name: Piovesana, O.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a $^2$D NMR investigation of the gapped spin-1/2 compound $Cu_2 (C_5 H_{12} N_2)_2 Cl_4$. Our measurements reveal the presence of a magnetic field induced transverse staggered magnetization (TSM) which persists well below and above the field-induced 3D long-range magnetically ordered (FIMO) phase. The symmetry of this TSM is different from that of the TSM induced by the order parameter of the FIMO phase. Its origin, field dependence and symmetry can be explained by an intra-dimer Dzyaloshinskii-Moriya interaction, as shown by DMRG calculations on a spin-1/2 ladder. This leads us to predict that the transition into the FIMO phase is not in the BEC universality class.
description: 4 pages
Symmetry-resolved entanglement entropy in Wess-Zumino-Witten models
Creators: name: Calabrese, Pasquale
name: Dubail, Jérôme
name: Murciano, Sara
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the problem of the decomposition of the Rényi entanglement entropies in theories with a non-abelian symmetry by doing a thorough analysis of Wess-Zumino-Witten (WZW) models. We first consider $SU(2)_k$ as a case study and then generalise to an arbitrary non-abelian Lie group. We find that at leading order in the subsystem size $L$ the entanglement is equally distributed among the different sectors labelled by the irreducible representation of the associated algebra. We also identify the leading term that breaks this equipartition: it does not depend on $L$ but only on the dimension of the representation. Moreover, a $\log\log L$ contribution to the Rényi entropies exhibits a universal form related to the underlying symmetry group of the model, i.e. the dimension of the Lie group.
description: 31 pages, v2: minor changes
Τα γλυπτά της Θεσσαλονίκης στον χώρο και τον χρόνο
Creators: name: Καλογήρου, Αικατερίνη Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Γλυπτά
Θεσσαλονίκη
Χώρος και χρόνος
Sculptures
Thessaloniki
Space and time

description: Στόχος της εργασίας είναι να παρουσιαστούν τα αρχαία γλυπτά με γνωστή προέλευση από την πόλη της Θεσσαλονίκης σε σχέση με τον χώρο εύρεσής τους. Συγκεντρώθηκαν συνολικά 467 γλυπτά, τα οποία αριθμήθηκαν με έναν αριθμό καταλόγου, και τοποθετήθηκα στον χάρτη της πόλης. Η μελέτη των γλυπτών πραγματοποιήθηκε με γεωγραφική προετεραιότητα, ξεκινώντας από το δυτικό όριο της αρχαίας θέσης και συνεχίζοντας ανατολικά μέχρι και το αρχαίο αναταλικό τείχος της Θεσσαλονίκης. Επίσης, μελετήθηκαν τα γλυπτά που προέρχονται από τα δύο νεκροταφεία της, έξω από το δυτικό και ανατολικό τείχος, καθώς και αυτά που χρησιμοποιήθηκαν ως οικοδομικό υλικό σε ολόκληρη την αρχαία οχύρωση της πόλης. Σε όποια θέση βρέθηκαν περισσότερα του ενός γλυπτά, αυτά παρατέθηκαν με χρονολογική σειρά. Για την ευκολότερη αναζήτηση των γλυπτών δημιουργήθηκε ένας σύντομος Κατάλογος. Τέλος, σε τέσσερις διαφορετικούς χάρτες αποτυπώθηκε η παρουσία τους στον χώρο. Ο κυριότερος χάρτης απεικονίζει το πολεοδομικό σχέδιο της Θεσσαλονίκης, και πάνω σε αυτόν επισημάνθηκαν τα γλυπτά που εντοπίστηκαν μέσα στην πόλη και στα τείχη της. Άλλοι δύο χάρτες παριστάνουν τις σύγχρονες περιοχές της πόλης που αντιστοιχούν στα δύο αρχαία νεκροταφεία της Θεσσαλονίκης και τα ταφικά γλυπτά που αποκαλύθφηκαν εκεί, ενώ ένας μικρότερος περιλαμβάνει το οικόπεδο Βαρελά βόρεια της περιοχής της Αρχαίας Αγοράς και τα γλυπτά που βρέθηκαν εντοιχισμένα στα δύο αρχαία κτίσματα αυτού
description: The aim of this thesis is to present the ancient sculptures of known origin from the city of Thessaloniki in relation to their place of finding. A total of 467 sculptures, numbered with a catalog number, were assembled and placed on the city map. The study of the sculptures took place from a geographical point of view, starting from the western boundary of the ancient site and continuing to the east up to the ancient east wall of Thessaloniki. Also, the sculptures from the two cemeteries, outside the western and eastern walls, as well as those used as building material throughout the ancient fortification of the city were studied. Wherever there were found more than one sculptures, those were listed in chronological order. Furthermore, a Catalogue (list) has been created, for the convenience of the sculptures research. Finally, four different maps depict their presence in space. The main map illustrates the urban plan of Thessaloniki, and the sculptures found inside the city and its walls were highlighted on it. Two more maps represent the modern areas of the city that correspond to the two ancient cemeteries of Thessaloniki and the funerary sculptures that were discovered there, while a smaller one includes the Varela plot, placed northern of the Ancient Agora, and the sculptures found in its two ancient buildings
Sequential outbreaks due to a new strain of _Neisseria meningitidis_ Serogroup C in Northern Nigeria
Creators: name: Funk, Anna
name: Uadiale, Kennedy
name: Kamau, Charity
name: Caugant, Dominique
name: Ango, Umar
name: Greig, Jane
Publisher: name: F1000Research
Year: 2015

description: In the African meningitis belt, most meningitis outbreaks are caused by N. meningitidis serogroup A (NmA); these outbreaks are often large (up to 100,000 cases) and widespread. Serogroup C (NmC) outbreaks in northern Nigeria are rare, the only noted outbreak being in 1975.

In 2013-2014, MSF responded to two serial outbreaks in northwest Nigeria due to the same new strain of NmC. These are the first documented outbreaks due to only NmC to occur in the African meningitis belt since 1979, and were caused by a new strain.These are the first documented outbreaks due to only NmC to occur in the African meningitis belt since 1979, and were caused by a new strain.
Field Theory on Multi-throat Backgrounds
Creators: name: Cacciapaglia, Giacomo
name: Csaki, Csaba
name: Grojean, Christophe
name: Terning, John
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider extra dimensional field theory descriptions of backgrounds with N different throats where one of the extra dimensions in each throat is much larger than the others. Such backgrounds can be described by field theory on N 5D warped spaces which intersect on a ultraviolet (UV) brane. Given a field that propagates in all N throats there are N boundary conditions on the UV brane (which are determined by the effective Lagrangian on the UV brane) in addition to the boundary conditions on the N infrared branes. We derive a general set of UV boundary conditions and give examples of how they are applied to particular situations. Three simple example applications are given: in the first the number of families is determined by the number of throats and the SUSY flavor problem is solved via an S_3 symmetry of the throats; in the second we embed this scenario in a SUSY GUT with a solution of the doublet-triplet splitting problem based on the product group approach; while in the final example we show a simple geometric implementation of a SUSY trinification model on three throats.
description: 21 pages, 7 figures
Η σχέση της παρουσίας του ανθρώπινου δυναμικού στις διαφημίσεις με εργασιακές αντιλήψεις
Creators: name: Ψαλλίδα, Αντωνία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ανθρώπινο Δυναμικό
Εργασιακές Αντιλήψεις
Διαφημίσεις
Human Resources
Employee Perceptions
Advertisements

description: Στην παρούσα μελέτη, λαμβάνοντας υπόψιν τα σύγχρονα δεδομένα στα εργασιακά περιβάλλοντα και τη σημασία του ανθρώπινου παράγοντα για την ευημερία και τη βιωσιμότητα των επιχειρήσεων, συσχετίσαμε το ρόλο της διαφήμισης και του Μάρκετινγκ με στοιχεία και έννοιες της Διοίκησης των ανθρώπινων πόρων. Πιο συγκεκριμένα μελετήσαμε την παρουσία του ανθρώπινου δυναμικού μιας επιχείρησης στο διαφημιστικό της μήνυμα, καθώς επίσης και την επιρροή που έχουν τέτοιου είδους διαφημιστικά μηνύματα στην ελκυστικότητα της επιχείρησης, την αντιλαμβανόμενη οργανωσιακή υποστήριξη και την πρόθεση για αίτηση σε μια θέση εργασίας στη συγκεκριμένη επιχείρηση. Τα ευρήματά που προέκυψαν μέσα από πειραματική έρευνα που πραγματοποιήσαμε, επιβεβαίωσαν τις υποθέσεις μας, καταλήγοντας πως οι διαφημίσεις που εμπλέκουν το ανθρώπινο δυναμικό μιας επιχείρησης στο περιεχόμενο του μηνύματός τους φαίνεται να σχετίζονται θετικά με τις παραπάνω μεταβλητές. Θεωρούμε πως η έρευνά μας συμβάλει σημαντικά στην υπάρχουσα βιβλιογραφία, καθώς η διαθέσιμη βιβλιογραφία στο συγκεκριμένο πεδίο είναι πολύ περιορισμένη κι ελπίζουμε πως τα ευρήματά μας θα αποτελέσουν τη βάση για περεταίρω έρευνα μελλοντικά.
description: Considering the importance of human capital for the well-being and sustainability of firms, the present dissertation purpose is to suggest a relation between the role of Advertising and Marketing and the role of Human Resource Management. We investigated the presence of a company's employees in its advertising message. Moreover, we investigated the influence of such advertisements on the attractiveness of the organization, the perceived organizational support and the intention to apply for a job in that particular organization. Our findings confirmed the hypothesis and we came to the conclusion that there is a positive correlation between the advertisements including employees and the three variables mentioned above. We believe that we are enhancing the literature in a new field that is not deeply investigated and we hope that further research will be conducted in the future based on our results.
A Two-Dimensional MagnetoHydrodynamics Scheme for General Unstructured Grids
Creators: name: Livne, Eli
name: Dessart, Luc
name: Burrows, Adam
name: Meakin, Casey A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report a new finite-difference scheme for two-dimensional magnetohydrodynamics (MHD) simulations, with and without rotation, in unstructured grids with quadrilateral cells. The new scheme is implemented within the code VULCAN/2D, which already includes radiation-hydrodynamics in various approximations and can be used with arbitrarily moving meshes (ALE). The MHD scheme, which consists of cell-centered magnetic field variables, preserves the nodal finite difference representation of $div(\bB)$ by construction, and therefore any initially divergence-free field remains divergence-free through the simulation. In this paper, we describe the new scheme in detail and present comparisons of VULCAN/2D results with those of the code ZEUS/2D for several one-dimensional and two-dimensional test problems. The code now enables two-dimensional simulations of the collapse and explosion of the rotating, magnetic cores of massive stars. Moreover, it can be used to simulate the very wide variety of astrophysical problems for which multi-D radiation-magnetohydrodynamics (RMHD) is relevant.
description: 22 pages, including 11 figures; Accepted to the Astrophysical Journal. Higher resolution figures available at http://zenith.as.arizona.edu/~burrows/mhd-code/
High viral re-suppression rates amongst adults failing second-line antiretroviral therapy (ART) in Khayelitsha, South Africa
Creators: name: G Patten
name: L Wilkinson
name: G Van Cutsem
name: V Cox
Publisher: name: F1000Research
Year: 2015

description: Treatment failure amongst adults on second-line ART is of concern, given limited access to HIV resistance testing and third-line ART. With doctor support, a comprehensive clinical and adherence support programme for viraemic patients on protease inhibitor (PI) based second-line ART was implemented by nurses and lay counselors at a large primary care clinic in Khayelitsha, South Africa. We investigated the rate of viral re-suppression amongst patients after the programme intervention and the durability of re-suppression over time.With targeted adherence support, 64% of patients failing second-line ART re-suppressed without changing regimen; with more than half still re-suppressed after 1 year. Those who re-suppressed immediately were more likely to remain suppressed subsequently. Interventions to address patients with intermittent or chronic poor adherence to optimize resources are needed.
Stoichiometric growth of high Curie temperature heavily-alloyed GaMnAs
Creators: name: Mack, S.
name: Myers, R. C.
name: Heron, J. T.
name: Gossard, A. C.
name: Awschalom, D. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Heavily-alloyed, 100 nm Ga1-xMnxAs (x>0.1) films are obtained via low temperature molecular beam epitaxy utilizing a combinatorial technique which allows systematic control of excess arsenic during growth. Reproducible, optimized electronic, magnetic and structural properties are found in a narrow range of stoichiometric growth conditions. The Curie temperature of stoichiometric material is 150-165 K and independent of x within a large window of growth conditions while substitutional Mn content increases linearly, contradicting the prediction of the Zener Model of hole-mediated ferromagnetism.
description: 12 pages, 3 figures
Thinking About Graduate School in Biology: Our Tips for Success
Creators: name: Early, Catherine
name: Flemming, Adania
name: Pirlo, Jeanette
name: Ruiz-Escobar, Sorilis
Publisher: name: QUBES Educational Resources
Year: 2021

description: As part of the iDigTrio 2020 Biological Conference and Fair we created this document to supplement our workshop on "Applying for Graduate school". This is a compilation drawing from the four author's lived experiences.
Characterization of inconel/carbon multilayer mirrors for 45 Å wavelength
Creators: name: Aouadi, Mohamed Samir
Publisher: name: University of British Columbia
Year: 2009

description: This thesis reports on the study of x-ray mirrors that operate at normal incidence for 45 Å wavelength used in applications such as x-ray microscopy, x-ray astronomy, x ray lithography, x-ray imaging, and x-ray lasers. These mirrors are fabricated by alternately depositing two materials of different scattering factors to form a multilayer structure. A theoretical treatment to identify new combinations of materials for these mirrors was provided. Carbon and inconel were then selected for ‘low index’ and ‘high index’ layers, respectively, in the multilayer system. The thin film laboratory at U.B.C. was set-up for x-ray multilayer research by automating a sputter coater to allow for the deposition of multilayers and by developing the appropriate software for data analysis. The optical and structural properties, the chemical composition, and the thermal stability of the deposited materials were measured as a function of argon pressure and substrate bias voltage using X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD), Grazing X-ray Reflectometry (GXR), and Spectroscopic Ellipsometry (SE). Multilayers grown at a low pressure and a moderate substrate bias (—40 to —80 V) were found to be the most suitable for x-ray reflectors. Also, samples for second order reflection (period = 45 Å) were found to be more stable than samples for first order reflection (period = 22.5 Å). In situ ellipsometry was used to monitor the deposition of single layers and multilayers of inconel and carbon. Valuable information was obtained regarding the early stages of film growth, interdiffusion at the interfaces, porosity of the films, etc. The coalescence thickness of inconel was found to be 10 Å . Interdiffusion was found to occur at the ‘carbon-on-inconel’ interlace because of the rough underlying inconel layer but not at the ‘inconel-on-carbon’ interface because of the smooth underlying carbon layer. Interdifusion at the ‘carbon-on-inconel’ layer was also found to increase with the number of layers. The control routine worked well. However, timing was found to better control the reproducibility of the thickness.
Bringing care to our patients: improved retention in care through community management of HIV in Kinshasa
Creators: name: Kalenga, Lucien
name: Henshaw Mandi
name: Bergh, Rafael Van Den
name: Luemba, Abraham
name: Luyeye, Patrick
name: Jerlie Loko Roka
name: Lampaert, Emmanuel
name: Kiala Bonard
name: Goemare, Eric
name: Weggheleire, Anja De
Publisher: name: F1000Research
Year: 2015

description: We set out to describe the community approach to decentralized ART care and the level of patient retention in Kinshasa, with as specific objectives:

a) Describing baseline patient socio-demographic and clinical characteristics

b) Reporting on retention and attrition rates over 24 months of care

c) Identifying risk factors associated with attrition (death, loss to follow up, stopped ART)

d) Reporting viral load suppression over the course of the programmeThe community care centre model represents a promising model of decentralized care in the setting of Kinshasa. High retention rates were likely achieved by the reduced distances and shorter waiting times in the community care centres. While systematic information on patients’ clinical condition in the community care was lacking, viral load data suggests that the care was adequate. This model of care may serve as an exemplary strategy for responsibilising patients and decongesting the overburdened hospitals and health centres in sub-Saharan Africa.
Hyperfine Interactions in Graphene and Related Carbon Nanostructures
Creators: name: Yazyev, Oleg V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Hyperfine interactions, magnetic interactions between the spins of electrons and nuclei, in graphene and related carbon nanostructures are studied. By using a combination of accurate first principles calculations on graphene fragments and statistical analysis, I show that both isotropic and dipolar hyperfine interactions can be accurately described in terms of the local electron spin distribution and atomic structure. A complete set of parameters describing the hyperfine interactions of C-13 and other nuclear spins at substitution impurities and edge terminations is determined.
description: 4+ pages, 2 figures. Improved and extended database of values
Deep Reinforcement Agent for Scheduling in HPC
Creators: name: Fan, Yuping
name: Lan, Zhiling
name: Childers, Taylor
name: Rich, Paul
name: Allcock, William
name: Papka, Michael E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Cluster scheduler is crucial in high-performance computing (HPC). It determines when and which user jobs should be allocated to available system resources. Existing cluster scheduling heuristics are developed by human experts based on their experience with specific HPC systems and workloads. However, the increasing complexity of computing systems and the highly dynamic nature of application workloads have placed tremendous burden on manually designed and tuned scheduling heuristics. More aggressive optimization and automation are needed for cluster scheduling in HPC. In this work, we present an automated HPC scheduling agent named DRAS (Deep Reinforcement Agent for Scheduling) by leveraging deep reinforcement learning. DRAS is built on a novel, hierarchical neural network incorporating special HPC scheduling features such as resource reservation and backfilling. A unique training strategy is presented to enable DRAS to rapidly learn the target environment. Once being provided a specific scheduling objective given by system manager, DRAS automatically learns to improve its policy through interaction with the scheduling environment and dynamically adjusts its policy as workload changes. The experiments with different production workloads demonstrate that DRAS outperforms the existing heuristic and optimization approaches by up to 45%.
description: Accepted by IPDPS 2021
Evidence for TP-AGB stars in high redshift galaxies, and their effect on deriving stellar population parameters
Creators: name: Maraston, C.
name: Daddi, E.
name: Renzini, A.
name: Cimatti, A.
name: Dickinson, M.
name: Papovich, C.
name: Pasquali, A.
name: Pirzkal, N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We explore the effects of stellar population models on estimating star formation histories, ages and masses of high redshift galaxies. The focus is on the Thermally-Pulsing Asymptotic Giant Branch (TP-AGB) phase of stellar evolution, whose treatment is a source of major discrepancy among different evolutionary population synthesis. In particular, besides the models usually adopted in the literature, we use models (by Maraston 2005), in which the contribution of the TP-AGB phase is observationally calibrated and is the dominant source of near-IR energy for stellar populations in the age range 0.2 to 2 Gyr. We use a sample of high-z galaxies in the HUDF, with spectroscopic redshifts, and Spitzer IRAC and MIPS photometry from GOODS. We find that the TP-AGB phase plays a key role in the interpretation of Spitzer data for high-z galaxies, when the rest-frame near-IR is sampled. When fitting without dust reddening, the models with the empirically-calibrated TP-AGB phase always reproduce better the observed spectral energy distributions (SEDs). Allowing for dust reddening improves the fits with literature models in some cases. In both cases, the results from Maraston models imply younger ages by factors up to 6 and lower stellar masses (by ~60 % on average). The observed strengths of the MgUV spectral feature compare better to the predicted ones in the case of the Maraston models, implying a better overall consistency of SED fitting. Finally, we find that photometric redshifts improve significantly using these models on the SEDs extending over the IRAC bands. This work provides the first direct evidence of TP-AGB stars in the primeval Universe.
description: 14 pages, 10 figures, 3 tables, submitted to the Astrophysical Journal
Σχολιασμένη διερμηνεία στο πλαίσιο της πρακτικής άσκησης με έμφαση στην πνευματική και ψυχολογική κατάσταση του διερμηνέα και πώς αυτή επηρεάζει την απόδοσή του
Creators: name: Μαντίδη, Αθηνά Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Διερμηνεία Συνεδρίων
Ταυτόχρονη διερμηνεία
Διαδοχική διερμηνεία
Conference Interpreting
Simultaneous interpreting
Consecutive interpreting

description: Κατά τη διάρκεια της πρακτικής άσκησης στο πλαίσιο του Διατμηματικού Προγράμματος Μεταπτυχιακών Σπουδών Διερμηνείας και Μετάφρασης της Φιλοσοφικής σχολής του Αριστοτελείου Πανεπιστημίου, οι τελειόφοιτοι/τες καλούνται να ανταποκριθούν σε πραγματικές συνθήκες διερμηνείας σε επιλεγμένες συνεδριακές διοργανώσεις. Σκοπός της εργασίας είναι η σαφής και ολοκληρωμένη αποτύπωση της εμπειρίας αυτής και των διαδικασιών της κατά την προετοιμασία και διεξαγωγή της διερμηνείας. Το θέμα προσεγγίζεται μέσα από το πρίσμα των παραμέτρων που επηρεάζουν την πνευματική και ψυχολογική κατάσταση του/της διερμηνέα, πριν και κατά τη διάρκεια της διερμηνείας, η οποία διαμορφώνεται από εξωτερικούς και εσωτερικούς παράγοντες και έχει άμεση επίδραση στην απόδοσή του/της. Περιγράφεται η προετοιμασία και η μελέτη που απαιτήθηκε καθώς και οι συνθήκες διεξαγωγής των πέντε συνεδρίων της πρακτικής άσκησης και επιχειρείται μια συνολική αξιολόγηση της απόδοσης της γράφουσας με βάση τις εκάστοτε παραμέτρους καθώς και η εξαγωγή βασικών συμπερασμάτων
description: During the Joint Postgraduate Studies Programme in Conference Interpreting and Translation of the Aristotle University, students are entitled to a traineeship within which they are expected to provide interpretation services in professional real-life conditions during selected events. The dissertation aims to describe this experience in a clear and coherent way, covering both the study and preparation of the event as well as the interpreting performance itself. The latter is analyzed through components affecting the interpreter’s emotional and intellectual status before and during interpretation. Through reporting and evaluation of the preparation activities and the actual conference interpreting of five different events, the dissertation argues that there is a clear impact of both internal and external parameters to the interpreter’s performance. This impact may be tailored to the interpreter’s needs through disciplined study and the development of the composure and right reflexes needed
Radiative Transitions of Charmoniumlike Exotics in the Dynamical Diquark Model
Creators: name: Gens, Justin M.
name: Giron, Jesse F.
name: Lebed, Richard F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Using the dynamical diquark model, we calculate the electric-dipole radiative decay widths to $X(3872)$ of the lightest negative-parity exotic candidates, including the four $I=0$, $J^{PC} \! = \! 1^{--}$ ("$Y$") states. The $O$(100--1000 keV) values obtained test the hypothesis of a common substructure shared by all of these states. We also calculate the magnetic-dipole radiative decay width for $Z_c(4020)^0 \! \to \! γX(3872)$, and find it to be rather smaller ($
description: 10 pages, Version accepted for publication at Phys. Rev. D. Includes calculations beyond long-wavelength limit
Low rate of follow-up of raised HIV viral load results after screening for ART failure
Creators: name: R Harrison
name: T Maparo
name: C Gumunyu
name: C Ssonko
name: H Subramanian
name: E Tsikiwa
name: M Mundandi
name: A K Belaye
name: J Arhem
name: J Greig
name: E C Casas
Publisher: name: F1000Research
Year: 2015

description: This study aims to retrospectively evaluate the follow up of raised HIV viral load (VL) results, in order to guide improved monitoring of patients.

There are a number of operational challenges that limit the impact of VL screening.

Issues identified in this analysis can be used to determine whether systems in place are adequate to support effective use of VL.

The main limitation of this study was that tracing patients’ results and outcomes were challenging due to gaps in data quality.
The cooling of atomic and molecular gas in DR21
Creators: name: Jakob, H.
name: Kramer, C.
name: Simon, R.
name: Schneider, N.
name: Ossenkopf, V.
name: Bontemps, S.
name: Graf, U. U.
name: Stutzki, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present an overview of a high-mass star formation region through the major (sub-)mm, and far-infrared cooling lines to gain insight into the physical conditions and the energy budget of the molecular cloud. We used the KOSMA 3m telescope to map the core ($10'\times 14'$) of the Galactic star forming region DR 21/DR 21 (OH) in the Cygnus X region in the two fine structure lines of atomic carbon CI and four mid-$J$ transitions of CO and $^{13}$CO, and CS $J=7\TO6$. These observations have been combined with FCRAO $J=1\TO0$ observations of $^{13}$CO and C$^{18}$O. Five positions, including DR21, DR21 (OH), and DR21 FIR1, were observed with the ISO/LWS grating spectrometer in the \OI 63 and 145 $μ$m lines, the \CII 158 $μ$m line, and four high-$J$ CO lines. We discuss the intensities and line ratios at these positions and apply Local Thermal Equilibrium (LTE) and non-LTE analysis methods in order to derive physical parameters such as masses, densities and temperatures. The CO line emission has been modeled up to J=20. From non-LTE modeling of the low- to high-$J$ CO lines we identify two gas components, a cold one at temperatures of T$_\RM{kin}\sim 30-40$ K, and one with T$_\RM{kin}\sim 80-150$ K at a local clump density of about n(H$_2$)$\sim 10^4-10^6$ cm$^{-3}$. While the cold quiescent component is massive containing typically more than 94 % of the mass, the warm, dense, and turbulent gas is dominated by mid- and high-$J$ CO line emission and its large line widths. The medium must be clumpy with a volume-filling of a few percent. The CO lines are found to be important for the cooling of the cold molecular gas, e.g. at DR21 (OH). Near the outflow of the UV-heated source DR21, the gas cooling is dominated by line emission of atomic oxygen and of CO.
Effects of a mobile phone-based intervention to increase post-abortion family planning
Creators: name: Smith, Chris
name: Thoai D Ngo
name: Gold, Judy
name: Edwards, Phil
name: Vannak, Uk
name: Sokhey, Ly
name: Machiyama, Kazuyo
name: Warnock, Ruby
name: Slaymaker, Emma
name: McCarthy, Ona
name: Free, Caroline
Publisher: name: F1000Research
Year: 2015

description: Post-abortion family planning (PAFP) is important to reduce subsequent unintended pregnancies. There is limited evidence for mobile phone-based interventions (mHealth) to increase contraception use. Our formative research indicated that only 40% of women adopted effective PAFP (pill, intra uterine device, implant, or injectable) at Marie Stopes International (MSI) Cambodia clinics. The objective of the MObile Technology for Improved Family Planning (MOTIF) trial was to assess the effects of a mHealth intervention to support PAFP in Cambodia.The MOTIF intervention significantly improved use of effective contraception at four months post-abortion, in particular long acting methods. Additional mobile phone-based support for PAFP should be considered in addition to existing abortion care services.
Community based ART adherence clubs: a community model of care for ART delivery
Creators: name: Solomon, Suhair
name: Phumelele Trasada
name: Patten, Gabriela
name: Fanelwa Gwashu
name: Twentiey, Lillian
name: Wilkinson, Lynne
Publisher: name: F1000Research
Year: 2015

description: Adherence Clubs (AC) are groups of up to 30 stable antiretroviral therapy patients who meet every two months with a lay health worker. They participate in a support group discussion, brief symptom screen, and collection of their pre-packed treatment. The AC model was piloted in Ubuntu clinic in Khayelitsha, Cape Town in 2007, and showed good outcomes; with wider adoption and implementation taking place in the Cape Metro health district in 2011. With community models of care supporting long term retention of growing ART populations receiving increasing attention. The community adherence clubs (CC) moved the facility based AC model of care from clinic into a club member’s home or nearby community venue.CCs ensure access to ART for patients close to home and good retention and adherence rates. CCs reduce patient load at health facilities, empowers patients through self management and reduces community stigma. Scaling up community models should be considered for wide-scale implementation, requiring emphasis on a reliable drug supply, adapted monitoring systems, trained and supported lay healthcare workers, effective referral systems and adequate funding.