cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Η πρακτική εφαρμογή της θεωρίας attention economy στον ψηφιακό μετασχηματισμό των επιχειρήσεων
title: The implementation of the theory attention economy on the digital transformation of the enterprises
titleType: AlternativeTitle
Creators: name: Ψυρρής, Δημήτριος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Attention economy
subject: Neuromarketing
subject: Ψηφιακός μετασχηματισμός

description: Η εργασία έχει θέμα: η πρακτική εφαρμογή της θεωρίας «Attention economy» στον ψηφιακό μετασχηματισμό των επιχειρήσεων. Σκοπός της είναι να διερευνηθεί με ποιο τρόπο η ψηφιακή τεχνολογία μπορεί να βοηθήσει τις επιχειρήσεις να βελτιώσουν τη λειτουργία τους, να παράξουν καλύτερα προϊόντα και υπηρεσίες και να προσφέρουν μεγαλύτερη ικανοποίηση στο αγοραστικό κοινό. Για την εκπόνηση αυτής εργασίας εξετάζονται μια σειρά από ζητήματα, όπως οι λόγοι που δυσχεραίνουν το έργο των εργαζόμενων και οι λόγοι για τους οποίους οι επιχειρήσεις αποτυγχάνουν να ικανοποιήσουν τις ανάγκες των πελατών τους. Η παρούσα πτυχιακή χωρίζεται σε πέντε μέρη. Στο πρώτο κεφάλαιο εξετάζουμε πως η εξέλιξη της τεχνολογίας ευθύνεται για την γιγαντιαία αύξηση του αριθμού των πληροφοριών που παράγονται και ποιες είναι η επιπτώσεις. Στο δεύτερο κεφάλαιο εξετάζουμε της έννοια και τα χαρακτηριστικά της «προσοχής» και αναλύουμε τα αίτια και τις επιπτώσεις από την έλλειψή της. Στο τρίτο κεφάλαιο παρουσιάζουμε την θεωρία «Attention economy» ως λύση για το πρόβλημα που περιγράψαμε στο προηγούμενο κεφάλαιο και αναλύουμε με ποιο τρόπο θα γίνει η ανάσχεση του φαινομένου της έλλειψης της προσοχής. Στο τέταρτο κεφάλαιο αναλύουμε πως η επιστήμη του Neuromarketing συμβάλλει στην κατανόηση της συμπεριφοράς του καταναλωτή, ποια είναι τα αίτια που καθορίζουν τις αγοραστικές του επιλογές και πως μπορεί η επιχείρηση να προσαρμόσει τη λειτουργία της στις ανάγκες του. Στο πέμπτο κεφάλαιο γίνεται αναφορά στα εργαλεία τα οποία παρέχει η ψηφιακή τεχνολογία στις επιχειρήσεις και πως ο ψηφιακός μετασχηματισμός τους θα βοηθήσει στην αναβάθμιση της λειτουργίας τους, στην βελτίωση της ποιότητας των παραγόμενων αγαθών και υπηρεσιών, στην μείωση του κόστους παραγωγής και στην ταχύτερη και αποτελεσματικότερη λειτουργία.
Strong Randomness Fixed Point in the Dissipative Random Transverse Field Ising Model
Creators: name: Schehr, Gregory
name: Rieger, Heiko
Publisher: name: arXiv
Year: 2005
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The interplay between disorder, quantum fluctuations and dissipation is studied in the random transverse Ising chain coupled to a dissipative Ohmic bath with a real space renormalization group. A typically very large length scale, L*, is identified above which the physics of frozen clusters dominates. Below L* a strong disorder fixed point determines scaling at a pseudo-critical point. In a Griffiths-McCoy region frozen clusters produce already a finite magnetization resulting in a classical low temperature behavior of the susceptibility and specific heat. These override the confluent singularities that are characterized by a continuously varying exponent z and are visible above a temperature T* ~ L*^{-z}.
description: 4 pages RevTeX, figures included
Do teachers' beliefs about math aptitude and brilliance explain gender differences in children's math ability self-concept?
Creators: name: Heyder, Anke
name: Steinmayr, Ricarda
name: Kessels, Ursula
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Gender differences
subject: Ability self-concept
subject: Math
subject: Teacher beliefs
subject: Implicit theories
subject: Elementary school
subject: 150
subject: Grundschule
subject: Geschlechtsunterschied
subject: Selbstbild
subject: Mathematik
subject: Lehrer

description: The self-concept of ability in math in elementary school is an early predictor for future math-related choices and careers. Unfortunately, already at this early age girls report lower ability self-concepts in math than boys—despite their comparable performances in objective math competence tests. In the present study we focus on teachers' beliefs as factors explaining these gender differences. Women's underrepresentation in math and science in academia has recently been explained by the belief held by the environment that success in these domains requires an innate ability that cannot be taught (“brilliance”). In addition, teachers' beliefs regarding their students' mathematical aptitude have also been found to influence students' self-concepts of ability. Here, we study if teachers' beliefs regarding their students' mathematical aptitude and brilliance beliefs may account for gender differences in elementary school students' self-concept of ability in math and thus potentially contribute to entering the gendered path into math and science professions. In a sample of 830 fourth graders (M = 9.14 years old, 49% female) and 56 elementary school teachers from Germany, we assessed teachers' beliefs regarding their students' mathematical aptitude and their belief that children need brilliance to succeed in math as well as children's mathematical ability self-concept and competencies. In line with prior research, boys reported a statistically significantly more positive math ability self-concept (d = 0.50), although boys and girls reached similar scores in a standardized math competence test (d = 0.07). However, multilevel regression analyses revealed that teachers' math brilliance beliefs were not related to the gender gap in students' ability self-concept in expense of girls whereas the gender gap was mediated by teachers' beliefs about their students' mathematical aptitude. These findings suggest that math brilliance beliefs held by important socializers such as teachers might not play a role in explaining gender differences in math-related motivation in elementary school whereas teachers' beliefs about students' math aptitude do. Results are discussed against the background of teacher expectancy effects, developmental changes in elementary school, and cultural differences.
description: Front. Educ.;4:34
Approaching the Self-Dual Point of the Sinh-Gordon model
Creators: name: Konik, Robert
name: Lájer, Márton
name: Mussardo, Giuseppe
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: One of the most striking but mysterious properties of the sinh-Gordon model (ShG) is the $b \rightarrow 1/b$ self-duality of its $S$-matrix, of which there is no trace in its Lagrangian formulation. Here $b$ is the coupling appearing in the model's eponymous hyperbolic cosine present in its Lagrangian, $\cosh(bϕ)$. In this paper we develop truncated spectrum methods (TSMs) for studying the sinh-Gordon model at a finite volume as we vary the coupling constant. We obtain the expected results for $b \ll 1$ and intermediate values of $b$, but as the self-dual point $b=1$ is approached, the basic application of the TSM to the ShG breaks down. We find that the TSM gives results with a strong cutoff $E_c$ dependence, which disappears according only to a very slow power law in $E_c$. Standard renormalization group strategies -- whether they be numerical or analytic -- also fail to improve upon matters here. We thus explore three strategies to address the basic limitations of the TSM in the vicinity of $b=1$. In the first, we focus on the small-volume spectrum. We attempt to understand how much of the physics of the ShG is encoded in the zero mode part of its Hamiltonian, in essence how `quantum mechanical' vs `quantum field theoretic' the problem is. In the second, we identify the divergencies present in perturbation theory and perform their resummation using a supra-Borel approximate. In the third approach, we use the exact form factors of the model to treat the ShG at one value of $b$ as a perturbation of a ShG at a different coupling. In the light of this work, we argue that the strong coupling phase $b > 1$ of the Lagrangian formulation of model may be different from what is naïvely inferred from its $S$-matrix. In particular, we present an argument that the theory is massless for $b>1$.
description: 84 pages, 23 figures, 1 table
Ground-state properties of a one-dimensional system of dipoles
Creators: name: Arkhipov, A. S.
name: Astrakharchik, G. E.
name: Belikov, A. V.
name: Lozovik, Yu. E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A one-dimensional (1D) Bose system with dipole-dipole repulsion is studied at zero temperature by means of a Quantum Monte Carlo method. It is shown that in the limit of small linear density the bosonic system of dipole moments acquires many properties of a system of non-interacting fermions. At larger linear densities a Variational Monte Carlo calculation suggests a crossover from a liquid-like to a solid-like state. The system is superfluid on the liquid-like side of the crossover and is normal in the deep on the solid-like side. Energy and structural functions are presented for a wide range of densities. Possible realizations of the model are 1D Bose atom systems with permanent dipoles or dipoles induced by static field or resonance radiation, or indirect excitons in coupled quantum wires, etc. We propose parameters of a possible experiment and discuss manifestations of the zero-temperature quantum crossover.
description: 4 pages, 4 figures
Kernel Aggregated Fast Multipole Method: Efficient summation of Laplace and Stokes kernel functions
Creators: name: Yan, Wen
name: Blackwell, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Many different simulation methods for Stokes flow problems involve a common computationally intense task -- the summation of a kernel function over $O(N^2)$ pairs of points. One popular technique is the Kernel Independent Fast Multipole Method (KIFMM), which constructs a spatial adaptive octree for all points and places a small number of equivalent multipole and local equivalent points around each octree box, and completes the kernel sum with $O(N)$ cost, using these equivalent points. Simpler kernels can be used between these equivalent points to improve the efficiency of KIFMM. Here we present further extensions and applications to this idea, to enable efficient summations and flexible boundary conditions for various kernels. We call our method the Kernel Aggregated Fast Multipole Method (KAFMM), because it uses different kernel functions at different stages of octree traversal. We have implemented our method as an open-source software library STKFMM based on the high performance library PVFMM, with support for Laplace kernels, the Stokeslet, regularized Stokeslet, Rotne-Prager-Yamakawa (RPY) tensor, and the Stokes double-layer and traction operators. Open and periodic boundary conditions are supported for all kernels, and the no-slip wall boundary condition is supported for the Stokeslet and RPY tensor. The package is designed to be ready-to-use as well as being readily extensible to additional kernels.
Randomized Fast Design of Short DNA Words
Creators: name: Kao, Ming-Yang
name: Sanghi, Manan
name: Schweller, Robert
Publisher: name: arXiv
Year: 2006
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We consider the problem of efficiently designing sets (codes) of equal-length DNA strings (words) that satisfy certain combinatorial constraints. This problem has numerous motivations including DNA computing and DNA self-assembly. Previous work has extended results from coding theory to obtain bounds on code size for new biologically motivated constraints and has applied heuristic local search and genetic algorithm techniques for code design. This paper proposes a natural optimization formulation of the DNA code design problem in which the goal is to design n strings that satisfy a given set of constraints while minimizing the length of the strings. For multiple sets of constraints, we provide high-probability algorithms that run in time polynomial in n and any given constraint parameters, and output strings of length within a constant factor of the optimal. To the best of our knowledge, this work is the first to consider this type of optimization problem in the context of DNA code design.
The Nature of the Driving Mechanism in the Pulsating Hybrid PG 1159 Star Abell 43
Creators: name: Quirion, P. -O.
name: Fontaine, G.
name: Brassard, P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We extend our previous pulsational stability analyses of PG 1159 stars by modeling the hybrid PG 1159 type star Abell 43. We show that the standard kappa-mechanism due to the ionization of C and O in the envelope of this H-rich PG 1159 star is perfectly able to drive g-mode pulsations. Thus, contrary to a recent suggestion, there is no need to invoke any new or exotic mechanism to explain the pulsational instabilities observed in this particular star. Our expected instability band for l = 1 modes extends in period from ~ 2604 s to ~ 5529 s, which is consistent with the available photometric observations of Abell 43. We also suggest that efforts to detect luminosity variations in its sibling NGC 7094 be pursued.
description: 3 pages, 1 figure, Accepted for publication in A&A
RÄUMLICH DIFFERENZIERTE STABILISIERUNGSWIRKUNGEN DER EUROPÄISCHEN AGRARPOLITIK IN UNTERSCHIEDLICH KONDITIONIERTEN ERZEUGERREGIONEN IN HESSEN
Creators: name: Harsche, Johannes
name: Harsche, Johannes
Publisher: name: Unknown
Year: 2006
Subjects: subject: Producer Support Estimate (PSE)

description: Das im Rahmen des Beitrags verfolgte Untersuchungsziel besteht darin, im Sinne einer Mit/Ohne-Analyse zu überprüfen, in welchem Maße die Gemeinsame Agrarpolitik innerhalb des Bundeslandes Hessen eine Verringerung der Instabilität der landwirtschaftlichen Erzeugereinnahmen zur Folge hat. Unterschieden wird hierbei zwischen drei verschiedenen Typen von Erzeugerregionen, die sich durch unterschiedliche landwirtschaftliche Standorteigenschaften auszeichnen. Den Untersuchungsergebnissen zufolge gingen innerhalb des Zeitraums 1986 bis 2002 von der Gemeinsamen Agrarpolitik erhebliche Stabilisierungseffekte auf die Einnahmen der hessischen Landwirte aus. Dies trifft vornehmlich auf die naturräumlich begünstigten Erzeugerregionen zu, während die Landwirtschaft in den naturräumlich weniger begünstigten Regionen nur in verhältnismäßig geringem Maße von den Stabilisierungswirkungen der Agrarpolitik tangiert wurde.
Chiral self-discrimination and guest recognition in helicene-based coordination cages
Creators: name: Schulte, Thorben R.
name: Holstein, Julian J.
name: Clever, Guido H.
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Anion recognition
subject: Chirality
subject: Host-guest chemistry
subject: Interpenetration
subject: Supramolecular chemistry
subject: 540

description: Chiral nanosized confinements play a major role for enantioselective recognition and reaction control in biological systems. Supramolecular self‐assembly gives access to artificial mimics with tunable sizes and properties. Herein, a new family of [Pd2L4] coordination cages based on a chiral [6]helicene backbone is introduced. A racemic mixture of the bis‐monodentate pyridyl ligand L1 selectively assembles with PdII cations under chiral self‐discrimination to an achiral meso cage, cis‐[Pd2L1P2L1M2]. Enantiopure L1 forms homochiral cages [Pd2L1P/M4]. A longer derivative L2 forms chiral cages [Pd2L2P/M4] with larger cavities, which bind optical isomers of chiral guests with different affinities. Owing to its distinct chiroptical properties, this cage can distinguish non‐chiral guests of different lengths, as they were found to squeeze or elongate the cavity under modulation of the helical pitch of the helicenes. The CD spectroscopic results were supported by ion mobility mass spectrometry.
description: Angew. Chem. Int. Ed.;58(17)
Στοχαστικές μέθοδοι πολυμεταβλητής μοντελοποίησης αποθεμάτων ασφαλιστικών χαρτοφυλακίων ζημιών
Creators: name: Καρυτινού, Ζαφειρία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Αποθέματα
subject: Bornhuetter - Ferguson Method
subject: Chain - Ladder Method
subject: IBNR
subject: Απόθεμα τριγώνων

description: Η εργασία αυτή επικεντρώνεται στην ανάδειξη των μοντέλων που χρησιμοποιούνται για την εύρεση των αποθεμάτων ασφαλιστικών χαρτοφυλακίων και συγκεκριμένα για χαρτοφυλάκια γενικών ασφαλίσεων. Ο στόχος της εργασίας είναι η παρουσίαση των μεθόδων αυτών στους αναγνώστες με τρόπο εύκολο και κατανοητό. Η μέθοδος που θα μελετηθεί είναι η μέθοδος της τριγωνικής εξέλιξης ζημιών ή όπως είναι γνωστή στη βιβλιογραφία ως Chain – Ladder Method. Η Chain – Ladder Method (CL) είναι μια από τις πιο διαδεδομένες μεθόδους που χρησιμοποιούνται για να εκτιμηθούν τα αποθέματα ασφαλιστικών χαρτοφυλακίων. Λόγω όμως ότι η μέθοδος αυτή επηρεάζεται αρκετά από ακραίες παρατηρούμενες τιμές (όπως για παράδειγμα ένα πολύνεκρο ατύχημα, ένας καταστροφικός σεισμός ή έντονα καιρικά φυσικά φαινόμενα που μπορεί να προκαλέσουν καταστροφικές ζημίες) είναι γεγονός ότι οι αναλογιστές προτιμούν να διασπούν το ασφαλιστικό χαρτοφυλάκιο σε άλλα μικρότερα χαρτοφυλάκια συνήθως ανάλογα με τις επιχειρησιακές γραμμές που έχει η εταιρία ούτως ώστε να γίνει μια πιο λεπτομερή και στοχευόμενη εκτίμηση των αποθεμάτων που πρέπει να κρατούνται. Αυτομάτως, η μέθοδος της Chain – Ladder μετατρέπεται σε Πολυμεταβλητή Chain – Ladder καθώς πλέον εργαζόμαστε σε μικρότερα ομοιογενή χαρτοφυλάκια από τα οποία το τελικό αποτέλεσμα της εκτίμησης θα προκύψει αν προσθέσουμε τις εκτιμήσεις του κάθε υπό-χαρτοφυλακίου. Η μοντελοποίηση αυτή και οι εκτιμήσεις των μελλοντικών υποχρεώσεων είναι από τις σημαντικότερες εργασίες που πρέπει να γίνονται σε μια ασφαλιστική εταιρία. Βάσει νόμου, η ασφαλιστική εταιρία θα πρέπει να δημιουργεί τα αποθέματά της με αυτό τον τρόπο ώστε να είναι φερέγγυα. Τέλος, η μέθοδος αποθεματοποίησης Πολυμεταβλητής Chain – Ladder είναι η πιο διαδεδομένη και εύκολης χρήσης μέθοδος που χρησιμοποιείται ακόμα και στις μέρες μας από τους αναλογιστές. Μέσα στην παρούσα διπλωματική εργασία θα υπάρξει και αναλυτικό παράδειγμα για το πώς εφαρμόζεται και χρησιμοποιείται η μέθοδος αυτή.
THE IMPACT OF FARMER FIELD SCHOOLS ON PESTICIDE USE AND ENVIRONMENT IN THAILAND
Creators: name: Praneetvatakul, Suwanna
name: Waibel, Hermann
name: Praneetvatakul, Suwanna
name: Waibel, Hermann
Publisher: name: Unknown
Year: 2006
Subjects: subject: Teaching/Communication/Extension/Profession
subject: Farmer Field School
subject: Impact Assessment
subject: Multi-Periods Panel Data Model
subject: Pesticide Use
subject: Environment

description: This paper presents an application of a difference in differences model to measure environmental and economic impacts of Farmer Field School on crop and pest management practices of rice in Thailand. Panel data from 241 farm households were collected three times over a period of four years in five rice-producing provinces of Thailand. Data included socio-economic data describing household and farm characteristics, rice input and output data including detailed accounts of pesticide use and other pest management practices and farmers' knowledge of crop management and agro ecosystem factors. Using the concept of environmental impact quotient parameters on the health and environmental consequences of a change in pesticide use was computed. Data analysis was conducted by measuring changes in farm performance, using a two and a three periods growth model. Results showed that trained farmers significantly reduced pesticide use on the short term. It was also found that they retain their reduced pesticide use practices several years after the training. However no significant change in rice gross margin could be detected.
Wilkens, Erwin: Die Zukunft der Kirche und die Zukunft der Welt
Creators: name: Kg.
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 18 Nr. 1 (1969): Ökumenische Rundschau, Band 18, Heft 1
Bayesian Image Reconstruction using Deep Generative Models
Creators: name: Marinescu, Razvan V
name: Moyer, Daniel
name: Golland, Polina
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Image and Video Processing (eess.IV)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Machine learning models are commonly trained end-to-end and in a supervised setting, using paired (input, output) data. Examples include recent super-resolution methods that train on pairs of (low-resolution, high-resolution) images. However, these end-to-end approaches require re-training every time there is a distribution shift in the inputs (e.g., night images vs daylight) or relevant latent variables (e.g., camera blur or hand motion). In this work, we leverage state-of-the-art (SOTA) generative models (here StyleGAN2) for building powerful image priors, which enable application of Bayes' theorem for many downstream reconstruction tasks. Our method, Bayesian Reconstruction through Generative Models (BRGM), uses a single pre-trained generator model to solve different image restoration tasks, i.e., super-resolution and in-painting, by combining it with different forward corruption models. We keep the weights of the generator model fixed, and reconstruct the image by estimating the Bayesian maximum a-posteriori (MAP) estimate over the input latent vector that generated the reconstructed image. We further use variational inference to approximate the posterior distribution over the latent vectors, from which we sample multiple solutions. We demonstrate BRGM on three large and diverse datasets: (i) 60,000 images from the Flick Faces High Quality dataset (ii) 240,000 chest X-rays from MIMIC III and (iii) a combined collection of 5 brain MRI datasets with 7,329 scans. Across all three datasets and without any dataset-specific hyperparameter tuning, our simple approach yields performance competitive with current task-specific state-of-the-art methods on super-resolution and in-painting, while being more generalisable and without requiring any training. Our source code and pre-trained models are available online: https://razvanmarinescu.github.io/brgm/.
description: 27 pages, 17 figures, 5 tables
Successive photoswitching and derivatization effects in photochromic dithienylethene-based coordination cages
Creators: name: Li, Ru-Jin
name: Han, Muxin
name: Tessarolo, Jacopo
name: Holstein, Julian J.
name: Lübben, Jens
name: Dittrich, Birger
name: Volkmann, Christian
name: Finze, Maik
name: Jenne, Carsten
name: Clever, Guido H.
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Coordination cages
subject: Dithienylethene
subject: Host guest systems
subject: Photoswitches
subject: Supramolecular chemistry
subject: 540

description: A new series of [Pd2(L)4] cages based on photochromic dithienylethene (DTE) ligands allowed us to gain insight into the successive photoswitching of multiple DTE moieties in a confined metallo‐supramolecular assembly. Three new X‐ray structures of [Pd2(o‐L4)4], [Pd2(o‐L1)2(c‐L1)2] and [Pd2(c‐L1)4] (o‐L and c‐L = open and closed forms of DTE ligands, respectively) were obtained. The structures deliver snapshots of three different combinations of DTE photoisomeric states within the cage, facilitating a comparison of the all‐open with the all‐closed, and most notably, an intermediate form where open and closed switches co‐exist in the same cage. Moreover, a series of spherical anionic borate clusters was introduced in order to study their roles in the light‐controllable host–guest chemistry. The binding guests show higher affinities with the flexible open cage [Pd2(o‐L1)4] than with the rigid closed cage [Pd2(c‐L1)4]. For the [B12F12]2− guest, thermodynamic data obtained from NMR experiments was compared to results from isothermal titration calorimetry (ITC).
DIE WTO-MINISTERKONFERENZ IN HONGKONG: WELCHE HANDELSWIRKUNGEN HABEN DIE AKTUELLEN VORSCHLAGE FUR DEN MARKTZUGANG?
Creators: name: Brockmeier, Martina
name: Pelikan, Janine
name: Klepper, Rainer
name: Brockmeier, Martina
name: Pelikan, Janine
name: Klepper, Rainer
Publisher: name: Unknown
Year: 2006
Subjects: International Relations/Trade

description: In diesem Beitrag werden die aktuellen Vorschläge der EU, der USA, der G 20 und der G 10 analysiert. Die Simulationen werden mit einem erweiterten GTAP Modell durchgeführt. Zu-sätzlich wird die GTAP Datenbasis um gebundene Zölle ergänzt, so dass "Wasser in den Zöl-len" Berücksichtigung findet. Die Ergebnisse zeigen, dass die Handelsbilanzentwicklung der EU 27 in den Sektoren für Rindfleisch, Zucker und sonstiges Fleisch maßgeblich durch die Höhe der Zollkürzungen beeinflusst wird. Die Handelsbilanz der Märkte für Getreide und Milch wird hingegen durch den Abbau der Exporterstattungen dominiert. Eine Dekompositi-on der Ergebnisse liefert weitere Details.
KUNDENZUFRIEDENHEIT IM NATURKOSTFACHHANDEL: DETERMINANTEN UND ERFOLGSWIRKSAMKEIT
Creators: name: Bolten, Jan
name: Kennerknecht, Raphael
name: Spiller, Achim
name: Zuhlsdorf, Anke
name: Bolten, Jan
name: Kennerknecht, Raphael
name: Spiller, Achim
name: Zuhlsdorf, Anke
Publisher: name: Unknown
Year: 2006
Subjects: subject: Consumer/Household Economics
subject: Kundenzufriedenheit
subject: Erfolgsfaktoren
subject: Regressionsanalyse

description: Der Beitrag analysiert den Einfluss der Kundenzufriedenheit auf den ökonomischen Erfolg im Naturkostfachhandel. Auf Basis einer Befragung von 885 Kunden und der Analyse der Betriebskennzahlen von 11 Naturkostfachgeschäften zeigt sich, dass die Kundenzufriedenheit ein relevanter Erfolgsfaktor für den Lebensmittelfachhandel ist. In Erweiterung der in der bisherigen Forschungspraxis üblichen isolierten Betrachtung von Kunden- und Betriebsdaten erlaubt deren parallele Erhebung Hinweise auf die tatsächliche Erfolgswirkung. In einer Regression erklären Unterschiede in der Gesamtzufriedenheit rund 45 % der Varianz des ökonomischen Erfolgs der Geschäfte. In einer weiteren Analyse konnten die wichtigsten Einflussfaktoren auf die Kundenzufriedenheit herausgearbeitet werden. Die Qualität der Ware und die Personalkompetenz stehen hier im Vordergrund.
RARE EARTH ELEMENT GEOCHEMISTRY OF MESOARCHEAN QUARTZITES OF GHATTIHOSAHALLI SCHIST BELT, WESTERN DHARWAR CRATON, KARNATAKA, INDIA: IMPLICATIONS ON PROVENANCE, PALEO-WEATHERING AND TECTONIC SETTING
Creators: name: M. VINAYA
name: GOVINDARAJU
name: G. S. SOMESHA
Publisher: name: Zenodo
Year: 2024
Subjects: Geochemistry, Provenance, Paleo-Weathering, Quartzites, REE, Tectonic Setting.

description: Abstract

The present study explores and characterizes the quartzites from the Ghattihosahalli Schist Belt for major and trace elements, including REEs, in order to analyze their paleo-weathering and provenance characteristics, as well as possible tectonic settings. A petrography and geochemical analysis of the quartzite was conducted in order to determine the extent of paleo-weathering and its provenance. Geochemical data plots like log (SiO2/Al2O3) vs. log (Fe2O3/K2O) & log (SiO2/Al2O3) vs. log (Na2O/K2O) categorize the quartzites as sub-arkose to sub-litharenite and fuchsite quartzites as arkose to litharenite. Na2O vs. K2O plot diagram shows quartz abundance in studied samples. Quartzite exhibits moderate to intense chemical weathering based on CIW, CIA, PIA and A-CN-K plots, while fuchsite quartzite exhibits semi-arid to semi-humid conditions. Chondrite normalized REE are fractionated in fuchsite quartzites and quartzites with low HREE. Discriminant functions suggest that studied samples have been formed in quartzose sedimentary fields. Plotting TiO2 vs. Ni indicates felsic provenance for the samples. Al2O3/SiO2 vs. Fe2O3+MgO and SiO2 vs. K2O/Na2O plots indicate quartzites occupied a passive margin tectonic setting. The major and trace element ratios, patterns of REE normalized on chondrites and diagrams of normalized multi-elements depicts that the studied quartzites are predominantly felsic with some mafic contribution.
Anderson Lattice Description of Photoassociation in an Optical Lattice
Creators: name: Miyakawa, Takahiko
name: Meystre, Pierre
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We consider atomic mixtures of bosons and two-component fermions in an optical lattice potential. We show that if the bosons are in a Mott-insulator state with precisely one atom per lattice, the photoassociation of bosonic and fermionic atoms into heteronuclear fermionic molecules is described by the Anderson Lattice Model. We determine the ground state properties of an inhomogeneous version of that model in the strong atom-molecule coupling regime, including an additional harmonic trap potential. Various spatial structures arise from the interplay between the atom-molecule correlations and the confining potential. Perturbation theory with respect to the tunneling coupling between fermionic atoms shows that anti-ferromagnetic correlations develop around a spin-singlet core of fermionic atoms and molecules.
description: 5 pages, 3 figures
On the asymptotic dynamics of 2-D magnetic quantum systems
Creators: name: Cárdenas, Esteban
name: Hundertmark, Dirk
name: Stockmeyer, Edgardo
name: Wugalter, Semjon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81Q10, 35Q41, 35B30

description: In this work we provide results on the long time localisation in space (dynamical localisation) of certain two-dimensional magnetic quantum systems. The underlying Hamiltonian may have the form $H=H_0+W$, where $H_0$ is rotationally symmetric, has dense point spectrum, and $W$ is a perturbation that breaks the rotational symmetry. In the latter case, we also give estimates for the growth of the angular momentum operator in time.
description: 29 pages
[Brev til DKNVS]
Creators: name: Keilhau, Baltazar Mathias
name: Det Kongelige Norske Videnskabers Selskab (DKNVS)
Publisher: name: Unknown
Year: 1846

description: Meddeler at de bevilgede 400 Spd. ikke er nok til å trykke Gæa norvegica
title: Is being a "small fish in a big pond" bad for students' psychosomatic health?
title: A multilevel study on the role of class-level school performance
titleType: AlternativeTitle
Creators: name: Rathmann, Katharina
name: Bilz, Ludwig
name: Hurrelmann, Klaus
name: Kiess, Wieland
name: Richter, Matthias
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: School performance
subject: Reference group effects
subject: Health complaints
subject: BFLPE
subject: Multilevel analysis
subject: HBSC
subject: 360
subject: 370
subject: Gesundheit
subject: Schule
subject: Bezugsgruppe

description: Background Features of schools and classes are closely related to students´ health and wellbeing. However, class composition (e.g. in terms of school performance) has rarely been examined in relation to students´ health and wellbeing. This study focuses on the so called Big-Fish-Little-Pond-Effect (BFLPE), by investigating whether the level of high-performing students in classroom is negatively associated with psychosomatic complaints of students who perceive themselves as poor performers. Methods Data were derived from the German sample of the WHO-Collaborative “Health Behaviour in School-aged Children (HBSC)” study 2013/2014. The sample included 5226 11-, 13- and 15-year-old students. Individual perceived school performance (PSP) was included (very good/good vs. average/below average PSP) at the individual student-level. At the class-level, school performance in class was generated by aggregating the share (in percentage) of students who report a very good/good PSP to the class-level, indicating the percentage of students with good/very good PSP in classroom. Using multilevel regression models, the association between class-level school performance (in percentage of students with very good/good PSP) and individual psychosomatic complaints were analyzed, stratified by students´ individual PSP. Results Students who report average/below average PSP showed higher likelihoods of psychosomatic complaints (Odds Ratio: 1.75; 95% Confidence Interval: 1.52–2.03) compared to counterparts with very good/good PSP. The aggregated class-level PSP was not significantly associated with psychosomatic complaints. However, in line with the BFLPE, results further revealed that students with average/below average PSP, who attend classes with a higher percentage of students who report very good/good PSP, had higher likelihoods of psychosomatic complaints (Odds Ratio: 1.91; 95% Confidence Interval: 1.01–4.01) compared to classmates with very good/good PSP. Conclusions This study revealed that class composition in terms of PSP was differentially associated with students´ psychosomatic complaints, depending on their individual PSP. Findings highlight the vulnerability of students with poor PSP placed in classes with a higher percentage of students with good PSP. Results of this study therefore indicate a need for initiatives for low performing students from teachers and school staff in class.
General Relativistic Force-Free Electrodynamics: A New Code and Applications to Black Hole Magnetospheres
Creators: name: McKinney, Jonathan C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The force-free limit of magnetohydrodynamics (MHD) is often a reasonable approximation to model black hole and neutron star magnetospheres. We describe a general relativistic force-free (GRFFE) formulation that allows general relativistic magnetohydrodynamic (GRMHD) codes to directly evolve the GRFFE equations of motion. Established, accurate, and well-tested conservative GRMHD codes can simply add a new inversion piece of code to their existing code, while continuing to use all the already-developed facilities present in their GRMHD code. We show how to enforce the $\mathbf{E}\cdot\mathbf{B}=0$ constraint and energy conservation, and we introduce a simplified general model of the dissipation of the electric field to enforce the $B^2-E^2>0$ constraint. We also introduce a simplified yet general method to resolve current sheets, without much reconnection, over many dynamical times. This formulation is incorporated into an existing GRMHD code (HARM), which is demonstrated to give accurate and robust GRFFE results for Minkowski and black hole space-times.
description: 14 pages, 4 figures, accepted for publication in MNRAS Main Journal
Impact of dimensional crossover on phonon transport in van der Waals materials: a case study of graphite and graphene
Creators: name: Strongman, Patrick
name: Maassen, Jesse
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using first-principles modeling, we investigate how phonon transport evolves in layered/van der Waals materials when going from 3D to 2D, or vice versa, by gradually pulling apart the atomic layers in graphite to form graphene. Focus is placed on identifying the features impacting thermal conductivity that are likely shared with other layered materials. The thermal conductivity $κ$ of graphite is found to be lower than that of graphene mainly due to changes in the phonon dispersion driven by van der Waals coupling. Specifically, as the atomic layers are brought closer together, the acoustic flexural phonons in graphene form low-energy optical flexural phonons in graphite that possess lower in-plane velocities, density-of-states and phonon occupation, thus reducing $κ$. Similar dispersion changes, and impact on thermal conductivity, can be expected in other van der Waals materials when transitioning from 2D to 3D. Our findings also indicate that the selection rules in graphene, which reduce phonon-phonon scattering and contribute to its large $κ$, effectively hold as the atomic layers are brought together to form graphite. While the selection rules do not strictly apply to graphite, in practice similar scattering behavior is displayed due in part to the weak inter-layer coupling. This suggests that van der Waals materials, in bulk 3D form, may have lower phonon-phonon scattering rates than other non-layered bulk materials.
description: 14 pages, 10 figures
Overcoming conservation in TALE-DNA interactions: a minimal repeat scaffold enables selective rerognition of an oxidized 5-methylcytosine
Creators: name: Maurer, Sara
name: Buchmuller, Benjamin
name: Ehrt, Christiane
name: Jasper, Julia
name: Koch, Oliver
name: Summerer, Daniel
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: 570
subject: 540

description: Transcription-activator-like effectors (TALEs) are repeat-based proteins featuring programmable DNA binding. The repulsion of TALE repeats by 5-methylcytosine (5mC) and its oxidized forms makes TALEs potential probes for their programmable analysis. However, this potential has been limited by the inability to engineer repeats capable of actual, fully selective binding of an (oxidized) 5mC: the extremely conserved and simple nucleobase recognition mode of TALE repeats and their extensive involvement in inter-repeat interactions that stabilize the TALE fold represent major engineering hurdles. We evaluated libraries of alternative, strongly truncated repeat scaffolds and discovered a repeat that selectively recognizes 5-carboxylcytosine (5caC), enabling construction of the first programmable receptors for an oxidized 5mC. In computational studies, this unusual scaffold executes a dual function via a critical arginine that provides inter-repeat stabilization and selectively interacts with the 5caC carboxyl group via a salt-bridge. These findings argue for an unexpected adaptability of TALE repeats and provide a new impulse for the design of programmable probes for nucleobases beyond A, G, T and C.
DIE FLEXIBLE FORDERUNG DES OKOLOGISCHEN LANDBAUS - Eine Alternative zur gegenwartigen flachenbezogenen Festbetragsforderung
Creators: name: Held, Jobst-Hendrik
name: Bahrs, Enno
name: Held, Jobst-Hendrik
name: Bahrs, Enno
Publisher: name: Unknown
Year: 2006
Subjects: Agricultural Finance

description: Die finanziellen Auswirkungen der Brüsseler Finanzbeschlüsse auf die 2. Säule der EU-Agrarpolitik stellen die Zukunft der derzeitigen flächenbezogenen Förderung des ökologischen Landbaus infrage. Zur Erhöhung der Effektivität und der Effizienz der Förderung wird deshalb das dem Ertragsteuerrecht entlehnte System der Flexiblen Förderung als Alternative zur bestehenden flächenbezogenen Festbetragsförderung vorgestellt. Die Auswirkungen der Flexiblen Förderung auf die ökologisch wirtschaftenden Betriebe werden diskutiert und gemäß der eigentlichen Zielstellung der Förderung beurteilt.
Evolving Apollonian Networks with Small-world Scale-free topologies
Creators: name: Zhang, Zhongzhi
name: Rong, Lili
name: Zhou, Shuigeng
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We propose two types of evolving networks: evolutionary Apollonian networks (EAN) and general deterministic Apollonian networks (GDAN), established by simple iteration algorithms. We investigate the two networks by both simulation and theoretical prediction. Analytical results show that both networks follow power-law degree distributions, with distribution exponents continuously tuned from 2 to 3. The accurate expression of clustering coefficient is also given for both networks. Moreover, the investigation of the average path length of EAN and the diameter of GDAN reveals that these two types of networks possess small-world feature. In addition, we study the collective synchronization behavior on some limitations of the EAN.
description: 10 pages, 7 figures. Physical Review E, in press; available at http://link.aps.org/abstract/PRE/v74/e046105
Preventing crash in stock market: The role of economic policy uncertainty during COVID-19
Creators: name: Dai, Peng-Fei
name: Xiong, Xiong
name: Liu, Zhifeng
name: Huynh, Toan Luu Duc
name: Sun, Jianjun
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Finance (q-fin.GN)
subject: General Economics (econ.GN)
subject: FOS: Economics and business

description: This paper investigates the impact of economic policy uncertainty (EPU) on the crash risk of US stock market during the COVID-19 pandemic. To this end, we use the GARCH-S (GARCH with skewness) model to estimate daily skewness as a proxy for the stock market crash risk. The empirical results show the significantly negative correlation between EPU and stock market crash risk, indicating the aggravation of EPU increase the crash risk. Moreover, the negative correlation gets stronger after the global COVID-19 outbreak, which shows the crash risk of the US stock market will be more affected by EPU during the pandemic.
description: 25 pages
Searching for merger debris in the Galactic halo: Chemodynamical evidence based on local blue HB stars
Creators: name: Altmann, Martin
name: Catelan, Marcio
name: Zoccali, Manuela
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the discovery of a group of local A-type blue horizontal-branch (HBA) stars moving in a prograde, comet-like orbit with very similar kinematics and abundances. This serendipitously discovered group contains 5 or 6 local HBA stars venturing very close to the Galactic centre; their [Fe/H] is around -1.7, and they seem to present minimum scatter in at least Mg, Si, Ti, Fe, Al, and Cr abundances. This ``Cometary Orbit Group'' (COG) was found while we were testing a new method to detect the debris associated with the merger of smaller, specific protogalactic entities into our galaxy. The method is primarily intended to identify field HBA stars with similar kinematics and detailed, multi-species abundance patterns as seen among members of a surviving remnant (e.g., omega Centauri). Quite possibly, the COG is the remnant, on a highly decayed orbit, of a merging event that took place in the relatively remote past (i.e., at least one revolution ago).
description: 4 pages and 2 EPS figures, accepted for publication in Astronomy and Astrophysics Letters
Continuous Time Individual-Level Models of Infectious Disease: a Package EpiILMCT
Creators: name: Almutiry, Waleed
name: K, Vineetha Warriyar
name: Deardon, Rob
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applications (stat.AP)
subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: This paper describes the R package EpiILMCT, which allows users to study the spread of infectious disease using continuous time individual level models (ILMs). The package provides tools for simulation from continuous time ILMs that are based on either spatial demographic, contact network, or a combination of both of them, and for the graphical summarization of epidemics. Model fitting is carried out within a Bayesian Markov Chain Monte Carlo (MCMC) framework. The continuous time ILMs can be implemented within either susceptible-infected-removed (SIR) or susceptible-infected-notified-removed (SINR) compartmental frameworks. As infectious disease data is often partially observed, data uncertainties in the form of missing infection times - and in some situations missing removal times - are accounted for using data augmentation techniques. The package is illustrated using both simulated and an experimental data set on the spread of the tomato spotted wilt virus (TSWV) disease.
title: Εκτίμηση της αξίας σε κίνδυνο και της αναμενόμενης ζημίας για κατανομές με βαριές ουρές και εφαρμογές στα χρηματοοικονομικά
title: Estimation of VaR and expected shortfall for heavy tailed distributions in finance
titleType: AlternativeTitle
Creators: name: Κάραβου, Ιωάννα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: VaR
subject: ES
subject: Expected shortfall
subject: Αναμενόμενη ζημία

description: Η μέτρηση του κινδύνου της αγοράς ή του πιστωτικού κινδύνου συνήθως πραγματοποιείται μέσω της λεγόμενης Αξίας σε Κίνδυνο (VaR). Αν και πρόκειται για ένα πολύ απλό και ευρέως διαδεδομένο μέτρο κινδύνου, είναι συνήθως προτιμότερη η χρήση ενός πιο σύνθετου και ευαίσθητου μέτρου κινδύνου, της Αναμενόμενης Ζημίας (ES, Expected Shortfall). Στην πρώτη ενότητα αναφερόμαστε γενικά στα μέτρα κινδύνου και αναλύουμε την έννοια και τις ιδιότητες δύο μέτρων κινδύνου συγκεκριμένα την Αξία σε Κίνδυνο (VaR) και την Αναμενόμενη Ζημία (ES, Expected Shortfall). Στην δεύτερη ενότητα παρουσιάζονται αναλυτικές και προσεγγιστικές εκφράσεις τόσο για τον υπολογισμό του VaR όσο και για τον υπολογισμό του ES θεωρώντας διάφορες κατανομές για το τυχαίο κέρδος ή ζημία μιας επένδυσης. Εξετάζονται διάφορα μοντέλα κατανομών με λεπτή (π.χ. κανονική) ή κυρίως με βαριά ουρά (π.χ. γενικεύσεις της Student’s t, stable Paretian, και γενικευμένη hyperbolic distribution) καθώς και μίξεις αυτών με την δημιουργία κώδικά μέσω του προγραμματιστικού περιβάλλοντος της γλώσσας Mathematica. Τέλος στην τρίτη ενότητα εκτιμώνται τα μέτρα κινδύνου VaR και ES για τρεις κατανομές με βάση πραγματικά δεδομένα που αφορούν την χρηματιστηριακή τιμή της μετοχής της apple.
A benchmark driven guide to binding site comparison: an exhaustive evaluation using tailor-made data sets (ProSPECCTs)
Creators: name: Ehrt, Christiane
name: Brinkjost, Tobias
name: Koch, Oliver
Publisher: name: Technische Universität Dortmund
Year: 2018
Subjects: subject: 570
subject: 540

description: The automated comparison of protein-ligand binding sites provides useful insights into yet unexplored site similarities. Various stages of computational and chemical biology research can benefit from this knowledge. The search for putative off-targets and the establishment of polypharmacological effects by comparing binding sites led to promising results for numerous projects. Although many cavity comparison methods are available, a comprehensive analysis to guide the choice of a tool for a specific application is wanting. Moreover, the broad variety of binding site modeling approaches, comparison algorithms, and scoring metrics impedes this choice. Herein, we aim to elucidate strengths and weaknesses of binding site comparison methodologies. A detailed benchmark study is the only possibility to rationalize the selection of appropriate tools for different scenarios. Specific evaluation data sets were developed to shed light on multiple aspects of binding site comparison. An assembly of all applied benchmark sets (ProSPECCTs–Protein Site Pairs for the Evaluation of Cavity Comparison Tools) is made available for the evaluation and optimization of further and still emerging methods. The results indicate the importance of such analyses to facilitate the choice of a methodology that complies with the requirements of a specific scientific challenge.
description: PLoS Comput Biol;14(11)