cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Great place to work: online recruitment από τις καλύτερες επιχειρήσεις
Creators: name: Κίκα, Ραφαέλα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2019
Subjects: subject: Online recruitment
subject: Employer branding
subject: Great place to work

description: Η παρούσα εργασία είναι μια μελέτη των καλύτερων επιχειρήσεων για να εργάζεται κάποιος (Great Place to Work) και των μεθόδων της διαδικτυακής αναζήτησης εργαζομένων και στελέχωσης (online recruitment). Στο θεωρητικό μέρος της εργασίας αναλύονται αφενός οι έννοιες και οι λειτουργίες της Διοίκησης Ανθρώπινου Δυναμικού, με έμφαση στις διαδικασίες στελέχωσης, και διαδικτυακής πρόσληψης και αφετέρου η έννοια του Employer Branding και του όρου Great Place to Work. Η έρευνα που έγινε περιλαμβάνει δευτερογενή στοιχεία από την ιστοσελίδα του οργανισμού Great Place to Work για τις 100 καλύτερες επιχειρήσεις/εργοδότες των Η.Π.Α. σύμφωνα με την λίστα που συνέταξε το περιοδικό Fortune και τους ιστότοπους των επιχειρήσεων αυτών για σκοπούς στελέχωσης. Η έρευνα που έγινε είναι ποσοτική με στοιχεία ποιοτικά. Τα αποτελέσματα της έρευνας κατέδειξαν ότι ο κλάδος της οικονομίας με τις περισσότερες επιχειρήσεις στη λίστα είναι αυτός με Οικονομικές και ασφαλιστικές υπηρεσίες. Οι επιχειρήσεις στη λίστα έχουν από χίλιους εργαζόμενους έως περισσότερου από διακόσιες χιλιάδες. Τα ποσοστά των υπαλλήλων που ανέφεραν ότι η επιχείρηση στην οποία εργάζονται είναι το καλύτερο μέρος για να εργάζεται κάποιος είναι μεταξύ 77% και 98%. Τα μέσα που χρησιμοποιούνται από τις επιχειρήσεις για την προσέλκυση των εργαζομένων περιλαμβάνουν περιγραφές, ιστορίες εργαζομένων, βίντεο με την εργασία και τη ζωή στην επιχείρηση και λέξεις / εκφράσεις που αναφέρονται στην κουλτούρα της επιχείρησης, τους ανθρώπους και τις αξίες. Το βιογραφικό σημείωμα αποτελεί το βασικό στοιχείο υποβολής αίτησης για εργασία.
Effective Quantum Dust Collapse via Surface Matching
Creators: name: Münch, Johannes
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The fate of matter forming a black hole is still an open problem, although models of quantum gravity corrected black holes are available. In loop quantum gravity (LQG) models were presented, which resolve the classical singularity in the centre of the black hole by means of a black-to-white hole transition, but neglect the collapse process. The situation is similar in other quantum gravity approaches, where eternal non-singular models are available. In this paper, a strategy is presented to generalise these eternal models to dynamical collapse models by surface matching. Assuming 1) the validity of a static quantum black hole spacetime outside the collapsing matter, 2) homogeneity of the collapsing matter, and 3) differentiability at the surface of the matter fixes the dynamics of the spacetime uniquely. It is argued that these assumptions resemble a collapse of pressure-less dust and thus generalises the Oppenheimer-Snyder-Datt model, although no precise model of the matter has to be assumed. Hawking radiation is systematically neglected in this approach. The junction conditions and the spacetime dynamics are discussed generically for bouncing black hole spacetimes, as proposed by LQG, although the scheme is approach independent. Further, the equations are explicitly solved for the recent model [1] and a global spacetime picture of the collapse is achieved. The causal structure is discussed in detail and the Penrose diagram is constructed. The trajectory of the collapsing matter is completely constructed from an inside and outside observer point of view. The general analysis shows that the matter is collapsing and re-expanding and crosses the Penrose diagram diagonally. This way the infinite tower of Penrose diagrams, as proposed by several LQG models, is generically not cut out. Questions about different timescales of the collapse for in- and outside observers can be answered.
description: 40 pages, 23 figures. Version accepted for publication in CQG. Minor changes, clarifications added
Στρατηγικό μάνατζμεντ και ανταγωνιστικό πλεονέκτημα: μελέτη περίπτωσης
Creators: name: Παπαντωνίου, Δανάη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Στρατηγικό μάνατζμεντ
subject: Ανταγωνιστικό πλεονέκτημα
subject: Ανθρώπινο δυναμικό
subject: Ξενοδοχειακές επιχειρήσεις

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι να διευρυνθεί η σχέση της ικανοποίησης των εργαζομένων με τη δημιουργία ευχαριστημένων και αφοσιωμένων πελατών με σκοπό την επίτευξη ανταγωνιστικού πλεονεκτήματος για μια επιχείρηση. Για την ολοκλήρωση της εργασίας κρίθηκε απαραίτητη η διαίρεσή της σε δύο μέρη. Το πρώτο μέρος αποτελείται από τέσσερα κεφάλαια. Αρχικά, στο πρώτο κεφάλαιο αναλύθηκε πλήρως η έννοια του στρατηγικού μάνατζμεντ και η σπουδαιότητα της στρατηγικής σε μια επιχείρηση. Στο δεύτερο κεφάλαιο αναπτύχθηκε τόσο η σημασία της διοίκησης ανθρωπίνων πόρων, όσο και γιατί το στρατηγικό μάνατζμεντ ανθρωπίνων πόρων είναι απαραίτητο για μια επιχειρησιακή μονάδα. Στο τρίτο κεφάλαιο διερευνήθηκε η σχέση των ανθρωπίνων πόρων με την απόκτηση ανταγωνιστικού πλεονεκτήματος. Συγκεκριμένα, αναπτύχθηκε η σημασία του ανταγωνιστικού πλεονεκτήματος, ο ρόλος της διοίκησης ανθρωπίνων πόρων στη δημιουργία ανταγωνιστικού πλεονεκτήματος και το πώς το ανθρώπινο δυναμικό μπορεί να αποτελέσει ανταγωνιστικό πλεονέκτημα για μια επιχείρηση. Στο τέταρτο κεφάλαιο αναπτύχθηκε η διοίκηση ανθρωπίνων πόρων στις ξενοδοχειακές επιχειρήσεις. Ειδικότερα, παρουσιάστηκαν οι αρμοδιότητες του τμήματος διοίκησης ανθρωπίνου δυναμικού των ξενοδοχειακών επιχειρήσεων, η στρατηγική διαχείρισης ανθρωπίνου δυναμικού στις ξενοδοχειακές επιχειρήσεις και η στρατηγική βελτίωση της ποιότητας των ξενοδοχειακών επιχειρήσεων. Στο δεύτερο μέρος της εργασίας το οποίο αποτελείται από ένα κεφάλαιο, παρουσιάστηκε η μελέτη περίπτωσης της ξενοδοχειακής επιχείρησης Ιrini Spa, όπου πραγματοποιείται μια γενική παρουσίαση της κωμόπολης Λουτρών Αιδηψού και της ιστορίας της στην οποία τοποθετείται και δραστηριοποιείται η ξενοδοχειακή μονάδα που μελετήθηκε. Στη συνέχεια αναλύθηκε η οργάνωση των ανθρωπίνων πόρων της ξενοδοχειακής επιχείρησης Irini Spa, η υποκίνηση τους, οι παράγοντες οι οποίοι παίζουν καθοριστικό ρόλο στην ψυχολογία των εργαζομένων, οι τρόποι που ακολουθεί το ξενοδοχείο Irini Spa για να αυξήσει την παραγωγικότητα των εργαζομένων και η επίδραση του παραγωγικού προσωπικού στην ικανοποίηση των πελατών της ξενοδοχειακής επιχείρησης. Η εργασία κλείνει παρουσιάζοντας ποια επιχειρηματική στρατηγική ακολουθεί το ξενοδοχείο Irini Spa και κάνοντας κάποιες προτάσεις έτσι ώστε να μπορέσει η επιχείρηση να βελτιωθεί μελλοντικά.
MARKET POWER AND COST-EFFICIENCY EFFECTS OF THE MARKET CONCENTRATION IN THE U.S. NITROGEN FERTILIZER INDUSTRY
Creators: name: Kim, C.S.
name: Hallahan, Charles B.
name: Taylor, Harold
name: Schluter, Gerald E.
name: Kim, C.S.
name: Hallahan, Charles B.
name: Taylor, Harold
name: Schluter, Gerald E.
Publisher: name: Unknown
Year: 2002
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: Nitrogen fertilizer
subject: oligopoly
subject: economies of size
subject: market power
subject: cost-efficiency.

description: This article examines the effects of increasing market concentration level in the U.S. nitrogen fertilizer industry. Results indicate that the costs of market power are greater than the benefits of market concentration, in terms of manufacturing cost efficiency. To provide a stable nitrogen fertilizer supply at a relatively low price, it may be necessary to control natural gas price and/or reduce new import barriers from Middle East and former member states of the Soviet Union, where low cost gas is produced as a byproduct. Keywords: Nitrogen fertilizer, oligopoly, economies of size, market power, cost-efficiency.
Global Short-Term Forecasting of Covid-19 Cases
Creators: name: Oliveira, Thiago de Paula
name: Moral, Rafael de Andrade
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: The continuously growing number of COVID-19 cases pressures healthcare services worldwide. Accurate short-term forecasting is thus vital to support country-level policy making. The strategies adopted by countries to combat the pandemic vary, generating different uncertainty levels about the actual number of cases. Accounting for the hierarchical structure of the data and accommodating extra-variability is therefore fundamental. We introduce a new modelling framework to describe the course of the pandemic with great accuracy, and provide short-term daily forecasts for every country in the world. We show that our model generates highly accurate forecasts up to six days ahead, and use estimated model components to cluster countries based on recent events. We introduce statistical novelty in terms of modelling the autoregressive parameter as a function of time, increasing predictive power and flexibility to adapt to each country. Our model can also be used to forecast the number of deaths, study the effects of covariates (such as lockdown policies), and generate forecasts for smaller regions within countries. Consequently, it has strong implications for global planning and decision making. We constantly update forecasts and make all results freely available to any country in the world through an online Shiny dashboard.
Structure, phase behavior and inhomogeneous fluid properties of binary dendrimer mixtures
Creators: name: Gotze, I. O.
name: Archer, A. J.
name: Likos, C. N.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The effective pair potentials between different kinds of dendrimers in solution can be well approximated by appropriate Gaussian functions. We find that in binary dendrimer mixtures the range and strength of the effective interactions depend strongly upon the specific dendrimer architecture. We consider two different types of dendrimer mixtures, employing the Gaussian effective pair potentials, to determine the bulk fluid structure and phase behavior. Using a simple mean field density functional theory (DFT) we find good agreement between theory and simulation results for the bulk fluid structure. Depending on the mixture, we find bulk fluid-fluid phase separation (macro-phase separation) or micro-phase separation, i.e., a transition to a state characterized by undamped periodic concentration fluctuations. We also determine the inhomogeneous fluid structure for confinement in spherical cavities. Again, we find good agreement between the DFT and simulation results. For the dendrimer mixture exhibiting micro-phase separation, we observe rather striking pattern formation under confinement.
description: 8 pages, 10 figures
PRESCRIBED FIRE: LIABILITY, REGULATION, AND ENDOGENOUS RISK
Creators: name: Yoder, Jonathan K.
name: Yoder, Jonathan K.
Publisher: name: Unknown
Year: 2002
Subjects: Resource /Energy Economics and Policy

description: This paper compares the incentive effects of strict liability and negligence rules when timing of activity affects environmental risk. The model is developed in the context of prescribed fire as a land management input, with an extension to the related problem of wildfire risk mitigation through vegetation management. The use of prescribed fire for land management and wildfire risk control is increasing in parts of the United States, and related liability and regulatory law is changing with it.
Tropane alkaloids: chemistry, pharmacology, biosynthesis and production
Creators: name: Kohnen-Johannsen, Kathrin Laura
name: Kayser, Oliver
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Tropane alkaloids
subject: Scopolamine
subject: Cocaine
subject: Calystegine
subject: Chemistry
subject: Pharmacology
subject: Biosynthesis
subject: Biotechnological production
subject: 660
subject: Alkaloide
subject: Pharmazie
subject: Biosynthese

description: Tropane alkaloids (TA) are valuable secondary plant metabolites which are mostly found in high concentrations in the Solanaceae and Erythroxylaceae families. The TAs, which are characterized by their unique bicyclic tropane ring system, can be divided into three major groups: hyoscyamine and scopolamine, cocaine and calystegines. Although all TAs have the same basic structure, they differ immensely in their biological, chemical and pharmacological properties. Scopolamine, also known as hyoscine, has the largest legitimate market as a pharmacological agent due to its treatment of nausea, vomiting, motion sickness, as well as smooth muscle spasms while cocaine is the 2nd most frequently consumed illicit drug globally. This review provides a comprehensive overview of TAs, highlighting their structural diversity, use in pharmaceutical therapy from both historical and modern perspectives, natural biosynthesis in planta and emerging production possibilities using tissue culture and microbial biosynthesis of these compounds.
AKLT-states as ZX-diagrams: diagrammatic reasoning for quantum states
Creators: name: East, Richard D. P.
name: van de Wetering, John
name: Chancellor, Nicholas
name: Grushin, Adolfo G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: From Feynman diagrams to tensor networks, diagrammatic representations of computations in quantum mechanics have catalysed progress in physics. These diagrams represent the underlying mathematical operations and aid physical interpretation, but cannot generally be computed with directly. In this paper we introduce the ZXH-calculus, a graphical language based on the ZX-calculus, that we use to represent and reason about many-body states entirely graphically. As a demonstration, we express the 1D AKLT state, a symmetry protected topological state, in the ZXH-calculus by developing a representation of spins higher than 1/2 within the calculus. By exploiting the simplifying power of the ZXH-calculus rules we show how this representation straightforwardly recovers the AKLT matrix-product state representation, the existence of topologically protected edge states, and the non-vanishing of a string order parameter. Extending beyond these known properties, our diagrammatic approach also allows us to analytically derive that the Berry phase of any finite-length 1D AKLT chain is $π$. In addition, we provide an alternative proof that the 2D AKLT state on a hexagonal lattice can be reduced to a graph state, demonstrating that it is a universal quantum computing resource. Lastly, we build 2D higher-order topological phases diagrammatically, which we use to illustrate a symmetry-breaking phase transition. Our results show that the ZXH-calculus is a powerful language for representing and computing with physical states entirely graphically, paving the way to develop more efficient many-body algorithms and giving a novel diagrammatic perspective on quantum phase transitions.
description: Updated version accepted in Phys. Rev. X Quantum
Constraints on the Cardassian Expansion from the Cosmic Lens All-Sky Survey Gravitational Lens Statistics
Creators: name: Alcaniz, J. S.
name: Dev, Abha
name: Jain, Deepak
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The existence of a dark energy component has usually been invoked as the most plausible way to explain the recent observational results. However, it is also well known that effects arising from new physics (e.g., extra dimensions) can mimic the gravitational effects of a dark energy through a modification of the Friedmann equation. In this paper we investigate some observational consequences of a flat, matter dominated and accelerating/decelerating scenario in which this modification is given by $H^{2} = g(ρ_m, n, q)$ where $g(ρ_m, n, q)$ is a new function of the energy density $ρ_m$, the so-called generalized Cardassian models. We mainly focus our attention on the constraints from the recent Cosmic All Sky Survey (CLASS) lensing sample on the parameters $n$ and $q$ that fully characterize the models. We show that, for a large interval of the $q - n$ parametric space, these models are in agreement with the current gravitational lenses data. The influence of these parameters on the acceleration redshift, i.e., the redshift at which the universe begins to accelerate, and on the age of the universe at high-redshift is also discussed.
description: 6 pages, 4 figures, AAS latex
H προσαρμογή των τραπεζών στο νέο κανονισμό για την προστασία των προσωπικών δεδομένων
Creators: name: Ξυγκάκη, Άννα-Κυριακή
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Επεξεργασία προσωπικών δεδομένων
subject: Γενικός Κανονισμός Προστασίας Δεδομένων (ΓΚΠΔ)
subject: Προσαρμογή των τραπεζών στον ΓΚΠΔ

description: Είναι κοινώς αποδεκτό ότι η προστασία των προσωπικών δεδομένων και, περαιτέρω, της ιδιωτικής ζωής αποτελούν θεμελιώδη ανθρώπινα δικαιώματα. Στην σημερινή εποχή, όμως, της μεγάλης ανάπτυξης της τεχνολογίας και της εύκολης μετάδοσης των πληροφοριών, η προστασία των προσωπικών δεδομένων δεν πραγματοποιείται με τον ενδεδειγμένο τρόπο. Για το λόγο αυτό η 26η Μαΐου 2018 αποτέλεσε ημερομηνία-σταθμό για την προστασία των δεδομένων προσωπικού χαρακτήρα των φυσικών προσώπων από την επεξεργασία καθώς τέθηκε σε ισχύ ο νέος Ευρωπαϊκός Κανονισμός 2016/679, που υποχρέωνε όλα τα κράτη-μέλη να εφαρμόσουν έναν νέο πολύ πιο αυστηρό κανονισμό. Στην παρούσα εργασία παρουσιάζεται η εφαρμογή του νέου Γενικού Κανονισμού για την προστασία των δεδομένων προσωπικού χαρακτήρα στα πιστωτικά ιδρύματα, καθώς είναι γεγονός ότι επηρεάζονται σε πολύ μεγάλο βαθμό από την εφαρμογή αυτού και οφείλουν σε σύντομο χρονικό διάστημα να συμμορφωθούν σε νέους κανόνες. Στο πρώτο κεφάλαιο της εργασίας πραγματοποιείται μία σύντομη αναφορά σε γενικές πληροφορίες για την επεξεργασία των προσωπικών δεδομένων ενώ στο δεύτερο κεφάλαιο γίνεται μία ιστορική αναδρομή προκειμένου να γίνει κατανοητό πώς οδηγηθήκαμε στην δημιουργία του νέου Κανονισμού. Στο τρίτο κεφάλαιο πραγματοποιείται μια σύντομη περιγραφή του Κανονισμού και στο τέταρτο κεφάλαιο εξετάζεται η εφαρμογή του Κανονισμού στον Τραπεζικό τομέα και η συμμόρφωση των Τραπεζών σ’ αυτόν. Τέλος, στο πέμπτο κεφάλαιο παρουσιάζεται η μελέτη περίπτωσης της Τράπεζας Πειραιώς
The sodium chloride complex catena-poly[[{μ3-2-[bis(2-hydroxyethyl)amino]ethan-1-ol}sodium] chloride], N(CH2CH2OH)3·NaCl
Creators: name: Krabbe, Christina
name: Gock, Vinusuya
name: Lutter, Michael
name: Jurkschat, Klaus
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Crystal structure
subject: Sodium chloride
subject: Amino alcohol
subject: Hydrogen bridge
subject: Graph-set analysis
subject: 540
subject: Kristallstruktur
subject: Natriumchlorid

description: The reaction of sodium chloride with 2-[bis­(2-hy­droxy­eth­yl)amino]­ethan-1-ol results in the formation of the title salt {[Na{N(CH2CH2OH)3}]Cl}n. The polymeric structure is characterized by a sodium cation coordinated by one nitro­gen and five oxygen atoms in a distorted octa­hedral environment. The resulting one-dimensional {—O—Na—O—Na—O}— coordination polymer extends parallel to [010] and is connected through the chloride counter-anion via O—H...Cl hydrogen bonding, giving rise to a two-dimensional supra­molecular structure parallel to (001).
Printing culture in rural North China
Creators: name: Flath, James A.
Publisher: name: University of British Columbia
Year: 2009

description: This manuscript examines the cultural history of rural North China, as seen through the production, circulation, content and interpretation of graphic wood-block prints, known as nianhua. The spatial focus is on a fixed set of print producing villages on the North China plain. The temporal focus encompasses the late 1800s through the early 1960s. In examining how nianhua were produced and distributed in late 19th and early 20th century North China, I show that the village print industry was prescriptive in organization. This organization was a basic factor in delimiting form and iconography in print, since it imposed limits on the free appropriation of texts, and directed the way in which they were read. Having accounted for these factors, I consider how perceptions of the social, physical and ethical world were put into print, and how print in turn configured perceptions of the world. Since print is thus socially derived, print and its interpretation are considered in terms of responses to social change, and the capacity of print to effect change. The environment in which village print is structured is variously considered to be formed by the following: the physical space of the home; late-imperial narrative structures (and their residual perpetuation beyond the decline of the political regime); narrative structures produced through technological change and expanded translocal experience; and state-centred reform beginning in the Republican era, and reaching its conclusion under communism. I conclude that narratives which began as superscriptive and authoritative structures, were appropriated and re-structured by the specific conditions of the production, distribution, and display of print in the village.
PRODUCING SOCIETY-READY GRADUATES BY ENGAGING ALUMNI IN THE UNDERGRADUATE LEARNING EXPERIENCE
Creators: name: Williams, Joseph E.
name: Williams, Joseph E.
Publisher: name: Unknown
Year: 2002
Subjects: Teaching/Communication/Extension/Profession

description: Students benefit from engaging alumni in the undergraduate learning experience. Benefits include improved career exploration, improved writing and speaking skills, improve information about securing the first job, increased self confidence, and changes in attitudes/revisions about required/elective courses and study plans. Benefits accruing to faculty, alumni, and department are also identified.
COST RELATIONSHIPS IN COLLEGES OF AGRICULTURE
Creators: name: Nefstead, Ward E.
name: Gillard, Steve A.
name: Nefstead, Ward E.
name: Gillard, Steve A.
Publisher: name: Unknown
Year: 2002
Subjects: Teaching/Communication/Extension/Profession

description: This paper examines cost behavior in higher education and colleges of agriculture. The authors have been involved in a multiyear project to determine how enrollment affects costs. The part of the study as summarized in the paper addresses the unique aspects of higher education that affect costs and presents three cost models based upon data from the University of Minnesota. Implications of these models related to average and marginal costs are discussed in relation to economies of size and scale.
Connected Coulomb Columns: Analysis and Numerics
Creators: name: Dondl, Patrick
name: Novaga, Matteo
name: Wojtowytsch, Stephan
name: Wolff-Vorbeck, Steve
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 5308, 28A75, 65N99

description: We consider a version of Gamow's liquid drop model with a short range attractive perimeter-penalizing potential and a long-range Coulomb interaction of a uniformly charged mass in $\R^3$. Here we constrain ourselves to minimizing among the class of shapes that are columnar, i.e., constant in one spatial direction. Using the standard perimeter in the energy would lead to non-existence for any prescribed cross-sectional area due to the infinite mass in the constant spatial direction. In order to heal this defect we use a connected perimeter instead. We prove existence of minimizers for this connected isoperimetric problem with long-range interaction and study the shapes of minimizers in the small and large cross section regimes. For an intermediate regime we use an Ohta-Kawasaki phase field model with connectedness constraint to study the shapes of minimizers numerically.
description: 16 pages, 6 figures
Maximum mass of a cold compact star
Creators: name: Sharma, R
name: Karmakar, S
name: Mukherjee, S
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We calculate the maximum mass of the class of compact stars described by Vaidya-Tikekar \cite{VT01} model. The model permits a simple method of systematically fixing bounds on the maximum possible mass of cold compact stars with a given value of radius or central density or surface density. The relevant equations of state are also determined. Although simple, the model is capable of describing the general features of the recently observed very compact stars. For the calculation, no prior knowledge of the equation of state (EOS) is required. This is in contrast to the earlier calculations for maximum mass which were done by choosing first the relevant EOSs and using those to solve the TOV equation with appropriate boundary conditions. The bounds obtained by us are comparable and, in some cases, more restrictive than the earlier results.
description: 18 pages including 4 *.eps figures. Submitted for publication
The widening participation agenda in German higher education: discourses and legitimizing strategies
Creators: name: Mergner, Julia
name: Leisyte, Liudvika
name: Bosse, Elke
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: German higher education
subject: Legitimizing strategies
subject: Policy discourse
subject: Qualitative content analysis
subject: Scandinavian institutionalism
subject: Translation perspective
subject: Widening participation
subject: 370
subject: Hochschulbildung
subject: Inhaltsanalyse
subject: Skandinavien
subject: Partizipation

description: Although participation in higher education (HE) has expanded in Europe, social inequalities remain a major political challenge. As HE expansion has not led to equal access and success, the mechanisms behind policies seeking to reduce inequalities need to be examined. Focusing on the widening participation agenda, this article investigates how universities translate political demands to their local contexts. The translation perspective is adopted to study the German HE system as an example characterized by high social exclusion. Based on policy document analysis, the study first explores the rationales underlying the discourse on widening participation. Second, a multiple case study design is used to investigate the organizational responses to the demand of widening participation. The findings indicate that the political discourse is dominated by two perspectives that regard widening participation as either a means to bring about social justice or to ensure a reliable pool of skilled labor. The study further reveals that different legitimizing strategies serve to link the policy of widening participation to local contexts. This study contributes to research on social inequalities in HE by introducing a translation perspective that permits analysis at both macro and organizational levels, while acknowledging institutional variations in organizational responses to political demands.
Semi-discrete composite solitons in arrays of quadratically nonlinear waveguides
Creators: name: Panoiu, Nicolae C.
name: Osgood, Richard M.
name: Malomed, Boris A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate that an array of discrete waveguides on a slab substrate, both featuring the $χ^{2}$ nonlinearity, supports stable solitons composed of discrete and continuous components. Two classes of fundamental composite solitons are identified: ones consisting of a discrete fundamental-frequency (FF) component in the waveguide array, coupled to a continuous second-harmonic (SH) component in the slab waveguide, and solitons with an inverted FF/SH structure. Twisted bound states of the fundamental solitons are found too. In contrast with usual systems, the \emph{intersite-centered} fundamental solitons and bound states with the twisted continuous components are stable, in an almost entire domain of their existence.
description: Optics Letters, in press
THE EFFECTS OF FOOD SAFETY ISSUES ON DIVERSIFIABLE AND NONDIVERSIFIABLE AGRIBUSINESS RISK
Creators: name: Wilson, Christine A.
name: Featherstone, Allen M.
name: Wilson, Christine A.
name: Featherstone, Allen M.
Publisher: name: Unknown
Year: 2002
Subjects: Agribusiness
Food Consumption/Nutrition/Food Safety

description: This effects of food safety issues on food and agribusiness firm financial risk and return are quantitatively examined using a Bayesian switching model. A capital asset pricing model is estimated to examine the pre- and post-issue on the firm. In addition, the diffusion process on other firms in the industry is also analyzed.
ALTERNATIVES TO CURRENT TRADE REMEDY LAW WITHIN NAFTA
Creators: name: Young, Linda M.
name: Young, Linda M.
Publisher: name: Unknown
Year: 2002
Subjects: International Relations/Trade

description: Economists have long criticized anti-dumping and countervailing duty processes. Analysis of current AD and CVD processes indicates shortcomings compared to a system of dispute resolution. Potential changes to current practices should first consider which of many possible goals the changes are trying to achieve. Both tweaking the current system and introduction of new processes are explored. It is proposed that consultations and good offices, such as used in the dispute resolution system of the World Trade Organization, should be considered.
title: Εμπλουτισμός ΒΔ πλοίων με μετεωρολογικά δεδομένα και έλεγχος αλιευτικής δραστηριότητας
title: Vessel AIS database enrichment with meteorological data and fishing activity control
titleType: AlternativeTitle
Creators: name: Αλεξέα, Μαρία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Marine meteorology
subject: Vessel AIS data
subject: Database enrichment

description: Η Ναυτική μετεωρολογία είναι ο τομέας της μετεωρολογίας που ασχολείται κυρίως με τη μελέτη των ωκεάνιων περιοχών, συμπεριλαμβανομένων των νησιωτικών και παράκτιων περιοχών. Τα μετεωρολογικά δεδομένα που αφορούν τη ναυτιλία είναι πλέον διαθέσιμα για χρήση μέσα από ανοιχτές Βάσεις Δεδομένων. Το Data Science Lab του Πανεπιστημίου Πειραιά έχει δημιουργήσει μια Βάση Δεδομένων συλλέγοντας, μέσω σημάτων AIS, δεδομένα που αφορούν στην κίνηση των πλοίων στο λιμάνι του Πειραιά αλλά και στην ευρύτερη περιοχή του Αργοσαρωνικού κόλπου. Στόχος της παρούσας εργασίας είναι ο εμπλουτισμός της Βάσης Δεδομένων του Data Science Lab με κινηματικά και στατικά δεδομένα που αφορούν στην κίνηση των πλοίων στο Αιγαίο πέλαγος και με μετεωρολογικά δεδομένα από ανοιχτές Βάσεις Δεδομένων. Τον σχεδιασμό και την υλοποίηση της Βάσης Δεδομένων θα ακολουθήσει η επεξεργασία των δεδομένων και η στατιστική ανάλυση των αποτελεσμάτων. Τα δεδομένα θα χρησιμοποιηθούν για τον έλεγχο της αλιευτικής δραστηριότητας υπό το πρίσμα των κανονισμών αλιείας, που σχετίζονται με τις καιρικές συνθήκες και τις επιτρεπόμενες περιοχές αλίευσης. Τέλος, πραγματοποιείται εξαγωγή συμπερασμάτων σχετικά με το πως επιδρούν τα καιρικά φαινόμενα στην κίνηση των πλοίων και η δημιουργία προτάσεων για τη χρήση δεδομένων καιρού στον τομέα της ναυτιλίας.
Probing New Physics through mu-e Universality in K->lnu
Creators: name: Masiero, A.
name: Paradisi, P.
name: Petronzio, R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The recent NA48/2 improvement on R_K=Gamma(K->e nu_e)/Gamma(K->mu nu_mu) emphasizes the role of K_l2 decays in probing the mu-e universality. Supersymmetric (SUSY) extensions of the Standard Model can exhibit mu-e non-universal contributions. Their origin is twofold: those deriving from lepton flavor conserving couplings are subdominant with respect to those arising from lepton flavor violating (LFV) sources. We show that mu-e non-universality in K_l2 is quite effective in constraining relevant regions of SUSY models with LFV (for instance, supergravities with a see-saw mechanism for neutrino masses). A comparison with analogous bounds coming from tau LFV decays proves the relevance of the measurement of R_K to probe LFV in SUSY.
description: v2: 5 pages, 1 figure. Comments and 2 references added
Nuclear parton distribution functions with uncertainties in a general mass variable flavor number scheme
Creators: name: Khanpour, Hamzeh
name: Soleymaninia, Maryam
name: Tehrani, S. Atashbar
name: Spiesberger, Hubert
name: Guzey, Vadim
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this article we obtain a new set of nuclear parton distribution functions (nuclear PDFs) at next-to-leading order and next-to-next-to-leading order accuracy in perturbative QCD. The common nuclear deep-inelastic scattering (DIS) data analyzed in our study are complemented by the available charged-current neutrino DIS data with nuclear targets and data from Drell-Yan cross-section measurements for several nuclear targets. In addition, the most recent DIS data from the Jefferson Lab CLAS and Hall C experiments are also added to our data sample. For these specific datasets, we consider the impact of target mass corrections and higher twist effects which are expected to be important in the region of large $x$ and intermediate-to-low $Q^2$. Our analysis is based on a publicly available open-source tool {\tt APFEL}, which has been modified to be applicable for our analysis of nuclear PDFs. Heavy quark contributions to nuclear DIS are considered within the framework of the {\tt FONLL} general-mass variable-flavor-number scheme. The most recent {\tt CT18} PDFs are used as baseline proton PDFs. The uncertainties of nuclear PDFs are determined using the standard Hessian approach. The results of our global QCD analysis are compared with existing nuclear PDF sets and with the fitted cross-sections, for which our set of nuclear PDFs provides a very good description.
description: 34 Pages 9 Tables 19 Figs
Safeguarding Online Sporting Spaces: Examining Virtual Maltreatment, Abuse and Toxic Social Media Practices Experienced by Olympic Athletes
Creators: name: Hayday, Emily
name: Geurin, Andrea
name: Burch, Lauren
name: Smith, Aaron CT
Publisher: name: Loughborough University
Year: 2024
Subjects: classificationCode: 35
subject: Commerce, management, tourism and services
classificationCode: 4407
subject: Policy and administration
classificationCode: 4410
subject: Sociology
subject: FOS: Sociology
classificationCode: 4701
subject: Communication and media studies

description: The pervasiveness of social media abuse targeting athletes raises significant concerns and dangers that extend beyond the digital realm. Online abuse not only erodes the mental and emotional well-being of athletes, but also poses a threat to their physical safety and professional careers. Policy makers and sport governing bodies must safeguard athletes from increasing online hate, abuse and harassment (Kearns et al., 2023). Calls for further research into toxic social media practices within elite sport have been made, especially focusing on non-Western nations and athletes beyond football (Kavanagh et al., 2016; Kearns et al., 2023; Mountjoy et al., 2016). This research sought to better understand online abuse, its impacts, and current or potential practices to attenuate it. This document is a condensed report of our findings in the format of an industry report.© the authors
title: Έρευνα και διάχυση γνώσης στην Ευρώπη
title: Knowledge research and dissemination in Europe
titleType: AlternativeTitle
Creators: name: Ντόστης, Ανδρέας
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Έρευνα
subject: Διάχυση γνώσης
subject: Ευρώπη

description: Στην εποχή μας όλο και περισσότερες χώρες στηρίζονται την παραγωγή την διάδοση αλλά και την εκμετάλλευση της επιστημονικής γνώσης η οποία λειτουργεί συνήθως ως εργαλείο αύξησης της παραγωγικότητας και βελτίωσης της οικονομίας. Μέσα σε μία τέτοια κατάσταση η επένδυση στην έρευνα και την ανάπτυξη αποτελεί ίσως την υψηλότερη σε προτεραιότητα επιλογή. Οι δαπάνες που χρησιμοποιούνται για τις δραστηριότητες αυτές μπορούν να αξιοποιηθούν ως παράγοντες ανάπτυξης μιας οικονομίας καθώς εκφράζουν την προσπάθεια μιας χώρας να παράξει γνώση, να την διαδώσει αποτελεσματικά και προφανώς να την εκμεταλλευτεί από οικονομικής απόψεως. Πηγαίνοντας τώρα στην κατάσταση που επικρατεί στην Ευρωπαϊκή Ένωση σήμερα, μπορούμε εύκολα να διακρίνουμε τις αυξημένες σε ύψος δαπάνες που προορίζονται για την ανάπτυξη του κλάδου και στοχεύουν τις περισσότερες φορές στην ενίσχυση της καινοτομίας και την βελτίωση του βιοτικού επιπέδου των πολιτών μέσω τις αναβαθμίσεις των κρατικών οικονομιών. Οι μελέτες που έχουν πραγματοποιηθεί κυκλοφορούν την έρευνα και την ανάπτυξη ασχολούνται κυρίως με την επίδραση των επενδύσεων στον τομέα αυτό, από την οπτική γωνία της κάθε επιμέρους κρατικής οικονομίας, επικεντρώνοντας στον βαθμό αύξησης της παραγωγικότητας. Παράλληλα, δεν είναι λίγες και εκείνες οι έρευνες πού εστιάζουν στην παραγωγή γνώσης, τη διάχυση της αλλά και τις οικονομικές δυνατότητες που μπορεί να προσφέρει στην χώρα από όπου προέρχεται. Το παρόν έργο πραγματοποιήθηκε με στόχο την εξέταση συγκεκριμένων παραγόντων προκειμένου να εξαχθούν συμπεράσματα γύρω από τις εμπορικές και οικονομικές συνέπειες των επενδύσεων σε έρευνα και ανάπτυξη καθώς και των επιπτώσεων στις οικονομίες που προκύπτουν που προκύπτουν από την παραγωγή την διάχυση και την αξιοποίηση γνώσεων.
title: Το μοντέλο του Altman και οι γενικεύσεις του
title: Altman's model and it's generalizations
titleType: AlternativeTitle
Creators: name: Αλεξόπουλος, Χρήστος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Βασιλεία
subject: Πιστωτικός κίνδυνος
subject: Διαχωριστική ανάλυση
subject: Altman’s Z-score
subject: Πολυμεταβλητή ανάλυση

description: Η έκταση που έχει πάρει το θέμα του πιστωτικού κινδύνου τα τελευταία χρόνια καθώς και οι απαιτήσεις των θεσμών (Βασιλεία) οδηγεί στην διαρκή προσπάθεια για την δημιουργία μοντέλων πρόβλεψης. Σκοπός της παρούσας εργασίας είναι η παρουσίαση, ενός μοντέλου πιστοληπτικής αξιολόγησης που βάση έχει την πολυμεταβλητή διαχωριστική ανάλυση, του μοντέλου του Altman ο οποίος το ανέπτυξε το 1968, για το οποίο γίνεται η αναλυτική παρουσίασή του. Γίνεται περιγραφή των διαδικασιών επιλογής των μεταβλητών, συντελεστών στάθμισης και σημείων αποκοπής του μοντέλου. Κατόπιν αποτυπώνονται εμπειρικά αποτελέσματα και συμπεράσματα όπως και η βελτιστοποίηση του Z-score σε ZETA-score. Στη συνέχεια παρουσιάζονται κάποιες παραλλαγές του πρωτότυπου μοντέλου που ανέπτυξε ο Altman, τόσο από τον ίδιο, όσο και από άλλους διακεκριμένους επιστήμονες της εποχής. Στο τέλος της εργασίας, γίνεται η εφαρμογή της μεθόδου που ακολούθησε ο Altman, σε προσομοιωμένα δεδομένα και συγκρίνονται τα αποτελέσματα που εξάγονται. Ως συμπέρασμα, θα πρέπει να σημειωθεί πως το μοντέλο του Altman χρήζει βελτιώσεων. Ήδη στην βιβλιογραφία βρίσκουμε αρκετούς ερευνητές οι οποίοι πρότειναν επεκτάσεις και βελτιώσεις του μοντέλου οι οποίες μπορούν να εναρμονιστούν εξίσου με τα δεδομένα της αγοράς.
LABOR, LIQUIDITY, LEARNING, CONFORMITY AND SMALLHOLDER TECHNOLOGY ADOPTION: THE CASE OF SRI IN MADAGASCAR
Creators: name: Moser, Christine M.
name: Barrett, Christopher B.
name: Moser, Christine M.
name: Barrett, Christopher B.
Publisher: name: Unknown
Year: 2002
Subjects: Farm Management

description: Although rice accounts for approximately forty-four percent of land under cultivation and forty-six percent of caloric intake in Madagascar, most farmers cannot produce enough rice to feed their families. Total rice production increased little in the country during the 1990s, and yields were stagnant and well below world average yields. Because of the importance of rice for both family income and nutrition and because of the significant role upland rice cultivation plays in deforestation in Madagascar, intensification of lowland rice production has been a major focus of many development interventions. The System of Rice Intensification (SRI) is a method that has been promoted and closely followed in Madagascar for more than ten years. SRI is remarkable for its dramatic increases in yields achieved without external inputs. While the method is more labor intensive, the doubling or even tripling of yields would appear to make the method extremely profitable. Despite its apparent potential and intensive extension efforts in some areas, adoption rates have generally been low, and the average rate of disadoption (the percentage of households who have tried the method and who no longer practice it) for study area was 40 percent. Using survey data from five communities in Madagascar, a sample selection model and a probit model were used to study three related choices farmers must make concerning the SRI. The first is whether to try the method, and then, conditional on having tried the method a farmer must decide how much of his lowland rice area to put in the SRI. Finally, for all subsequent years, a farmer must decide whether to continue using the method. While many adoption studies have looked at the role of liquidity and labor, few have done so in a dynamic setting. We take advantage of reliable recall data and NGO records on technology use to construct a panel data set, which was used to analyze the effects of learning, labor, liquidity, and social benefits over a five-year period. Learning has been the focus of several recent adoption studies, but this study tries to separate the learning effects from the effects of compliance with authority figures and with social and cultural norms. The results show that planting-season labor and liquidity constraints are extremely important factors in the adoption decisions of Malagasy farmers. Although the method is low-external input, the poorest farmers are not able to take advantage of the technology. This result is very important for development policy-makers in Madagascar who have often seen rice intensification as the most important means by which to alleviate rural poverty in Madagascar.
Influences of substrate pretreatments and Ti/Cr interlayers on the adhesion and hardness of CrAlSiN and TiAlSiN films deposited on Al2O3 and ZrO2-8Y2O3 thermal barrier coatings
Creators: name: Tillmann, Wolfgang
name: Fehr, Alexander
name: Stangier, Dominic
name: Dildrop, Markus
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Duplex coating
subject: Thermal barrier coating
subject: CrAlSiN
subject: TiAlSiN
subject: Coating adhesion
subject: Microhardness
subject: 620
subject: 670

description: Using atmospheric plasma spraying (APS), ceramic Al2O3 and ZrO2-8Y2O3 thermal barrier coatings (TBC) were applied on AISI H11 (1.2343) and subsequently polished to serve as a substrate to magnetron sputter CrAlSi7.5N and TiAlSi7.9N films. The influences of polishing as well as plasma etching processes on the surface roughness and residual stresses of the TBCs were correlated with the adhesion of the metal nitride films. As metallic interlayers are typically used to metallize insulating substrates to increase the film adhesion, the effect of different Cr and Ti interlayer thicknesses (50–150 nm) on the CrAlSi7.5N and TiAlSi7.9N adhesion was examined. Despite tensile stresses in the TBCs, a duplex coating structure, consisting of Al2O3 + Ti100 nm/TiAlSi7.9N, generated a high adhesion (Lc3 = 61.04 ± 2.36 N). In contrast to Cr, titanium interlayers are assumed to lead to a stress relaxation in the interface between the TBC and the PVD film. In general, using ZrO2-8Y2O3 as a substrate resulted in a minor adhesion of all PVD film combinations, which is traced back to lattice mismatches between the substrate and the films. Moreover, the number of pores on the TBC surface is crucial for the adhesion and hardness of CrAlSi7.5N and TiAlSi7.9N.
Διεθνείς θαλάσσιες μεταφορές εμπορευματοκιβωτίων FCL-LCL
Creators: name: Ταξοπούλου, Μαρία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Θαλάσσιες μεταφορές
subject: Εμπορευματοκιβώτια

description: Παρουσιάζουμε την καθοριστική σημασία των θαλάσσιων μεταφορών για την οικονομία. Αναλύουμε σε βάθος όλη τη διαδικασία εισαγωγής/εξαγωγής εμπορευμάτων, καθώς και το βασικό ρόλο και ευθύνη που έχουν οι μεταφορικές εταιρείες σε αυτό.
Three generations of stars: a possible case of triggered star formation
Creators: name: Areal, M. B.
name: Buccino, A.
name: Paron, S.
name: Fariña, C.
name: Ortega, M. E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Evidence for triggered star formation linking three generations of stars is difficult to assemble, as it requires convincingly associating evolved massive stars with Hii regions that, in turn, would need to present signs of active star formation. We present observational evidence for triggered star formation relating three generations of stars in the neighbourhood of the star LS II +26 8. We carried out new spectroscopic observations of LS II +26 8, revealing that it is a B0 III-type star. We note that LS II +26 8 is located exactly at the geometric centre of a semi-shell-like Hii region complex. The most conspicuous component of this complex is the Hii region Sh2-90, which is probably triggering a new generation of stars. The distances to LS II +26 8 and to Sh2-90 are in agreement (between 2.6 and 3 kpc). Analysis of the interstellar medium on a larger spatial scale shows that Hii region complex lies on the northwestern border of an extended H2 shell. The radius of this molecular shell is about 13 pc, which is in agreement with what an O9V star (the probable initial spectral type of LS II +26 8 as inferred from evolutive tracks) can generate through its winds in the molecular environment. In conclusion, the spatial and temporal correspondences derived in our analysis enable us to propose a probable triggered star formation scenario initiated by the evolved massive star LS II +26 8 during its main sequence stage, followed by stars exciting the Hii region complex formed in the molecular shell, and culminating in the birth of YSOs around Sh2-90.
description: Accepted in MNRAS (2020, May 28)
ENVIRONMENTAL STANDARDS AND DIRTY EXPORTS: A CASE STUDY ANALYSIS OF 24 COUNTRIES
Creators: name: Wilson, John S.
name: Sewadeh, Mirvat
name: Otsuki, Tsunehiro
name: Wilson, John S.
name: Sewadeh, Mirvat
name: Otsuki, Tsunehiro
Publisher: name: Unknown
Year: 2001
Subjects: Environmental Economics and Policy
International Relations/Trade

description: This paper examines how the stringency of environmental regulations impact international trade patterns. It explores the hypothesis that environmental regulation does not have a significant impact on trade. An econometric analysis is conducted for 24 countries ranging from highly developed to extremely poor to investigate whether environmental regulations have a significant impact on countries exports of pollution intensive goods. This econometric model extends Leamer (1984)'s cross-section Heckscher-Ohlin-Vanek (HOV) model by incorporating measures of stringency of environmental regulation. Correlation between capital intensity and exports are mitigated by grouping the sample countries. The results suggest that Metal, Steels, Pulp and Paper, and Chemicals Industries exhibit a negative relationship.