cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ο ρόλος της δημοσιονομικής και νομισματικής πολιτικής στη διαμόρφωση και εξέλιξη της χρηματοπιστωτικής κρίσης. Η περίπτωση του ελληνικού τραπεζικού κλάδου
Creators: name: Λειβαδίτη, Αναστασία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Νομισματική πολιτική
subject: Δημοσιονομική πολιτική
subject: Κρίση στις Η.Π.Α.
subject: Ελληνική κρίση χρέους
subject: Μηχανισμός στήριξης
subject: Μνημόνια
subject: Χρηματοοικονομική ανάλυση
subject: Αριθμοδείκτες

description: Η πρόσφατη χρηματοπιστωτική κρίση του 2007-2009, η οποία πυροδοτήθηκε από την πτώση των τιμών των κατοικιών στις ΗΠΑ και ενισχύθηκε από περαιτέρω μηχανισμούς ενίσχυσης, ανέδειξε τα τρωτά σημεία της οικονομία της Ελλάδας, αναγκάζοντας την τελευταία να προσφύγει σε συνολικά τρία προγράμματα οικονομικής προσαρμογής. Σαφώς, από την ελληνική κρίση χρέους δε θα μπορούσαν να μείνουν ανεπηρέαστοι οι επιλεγμένοι δείκτες αξιολόγησης της οικονομίας της καθώς και οι αριθμοδείκτες του τραπεζικού της κλάδου. Στο σημείο αυτό, αξίζει να σημειωθεί ότι η περίοδος εξέτασης ξεκινά από το έτος 2007 και ολοκληρώνεται το έτος 2018, με σκοπό την ανάδειξη της κατάστασης προ κρίσης, κατά τη διάρκεια αυτής και με το πέρας αυτής (31 Αυγούστου 2018). Ο αντικειμενικός σκοπός της παρούσας διπλωματικής εργασίας είναι να αναδείξει τι πυροδότησε και εν τέλει εξάπλωσε τη χρηματοπιστωτική κρίση σε ολόκληρο τον κόσμο και ειδικότερα στην Ελλάδα, με αφετηρία τις ΗΠΑ. Επίσης, τι ρόλο έπαιξαν οι ιθύνοντες χάραξης της Οικονομικής Πολιτικής στη διαμόρφωση και εξέλιξη αυτής σε ΗΠΑ και Ελλάδα και εν τέλει τι επιπτώσεις είχε στον τραπεζικό κλάδο της τελευταίας, για τη χρονική περίοδο 2007-2018, με τη χρήση των αριθμοδεικτών. Τα συμπεράσματα που προέκυψαν, λοιπόν, είναι ότι η χρηματοπιστωτική κρίση που ξεκίνησε από τις ΗΠΑ ουσιαστικά διήρκησε για τα έτη 2007-2009 και δεν οδήγησε σε ύφεση. Αυτό συνέβη διότι αυτοί που διαμορφώνουν την Οικονομική Πολιτική έπραξαν έγκαιρα και αποτελεσματικά στα σοκ που υπέστη η οικονομία. Αντιθέτως, στην περίπτωση της Ελλάδας, οι μνημονιακές συμβάσεις που υπογράφηκαν είχαν σε πολλές περιπτώσεις λανθασμένες προτάσεις οικονομικής πολιτικής και για 8 χρόνια, το μοναδικό πλάνο των ελληνικών κυβερνήσεων ήταν οι κατευθυντήριες γραμμές των Μνημονίων που επέβαλε η Τρόικα. Έτσι, η χώρα πέρασε από μία έντονη ύφεση, η οποία φαίνεται ότι αρχίζει να υποχωρεί σιγά-σιγά από το 2016. Τέλος, από τα πρώιμα κιόλας στάδια της κρίσης, οι αριθμοδείκτες συνολικά για τον τραπεζικό κλάδο σημείωσαν έντονη πτωτική πορεία, σαφώς επηρεασμένοι από την κακή πορεία της οικονομίας. Πιο συγκεκριμένα, τους επέφερε μεγάλες ζημίες στα αποτελέσματα χρήσεώς τους καθώς και ζημίες που αναλογούσαν στους κοινούς μετόχους της τράπεζας, αρνητικά ίδια κεφάλαια, χαμηλά επίπεδα ρευστότητας και ενδεχόμενο χαμηλό συνολικό δείκτη της κεφαλαιακής επάρκειας, εφόσον δεν υπόκεινταν σε κεφαλαιακή ενίσχυση. Παρ’ όλ’ αυτά, τα πράγματα φαίνεται ότι σταδιακά αλλάζουν, καθώς οι χρηματοοικονομικοί δείκτες του κλάδου για τα έτη 2016-2018 βελτιώνονται από χρονιά σε χρονιά, συμβαδίζοντας με τη σαφώς βελτιωμένη πορεία της ελληνικής οικονομίας.
NetSquid, a NETwork Simulator for QUantum Information using Discrete events
Creators: name: Coopmans, Tim
name: Knegjens, Robert
name: Dahlberg, Axel
name: Maier, David
name: Nijsten, Loek
name: Filho, Julio de Oliveira
name: Papendrecht, Martijn
name: Rabbie, Julian
name: Rozpędek, Filip
name: Skrzypczyk, Matthew
name: Wubben, Leon
name: de Jong, Walter
name: Podareanu, Damian
name: Torres-Knoop, Ariana
name: Elkouss, David
name: Wehner, Stephanie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In order to bring quantum networks into the real world, we would like to determine the requirements of quantum network protocols including the underlying quantum hardware. Because detailed architecture proposals are generally too complex for mathematical analysis, it is natural to employ numerical simulation. Here we introduce NetSquid, the NETwork Simulator for QUantum Information using Discrete events, a discrete-event based platform for simulating all aspects of quantum networks and modular quantum computing systems, ranging from the physical layer and its control plane up to the application level. We study several use cases to showcase NetSquid's power, including detailed physical layer simulations of repeater chains based on nitrogen vacancy centres in diamond as well as atomic ensembles. We also study the control plane of a quantum switch beyond its analytically known regime, and showcase NetSquid's ability to investigate large networks by simulating entanglement distribution over a chain of up to one thousand nodes.
description: NetSquid is freely available at https://netsquid.org; refined main text sections
КАЧЕСТВО ЖИЗНИ ПАЦИЕНТОВ С ХРОНИЧЕСКОЙ БОЛЕЗНЬЮ ПОЧЕК
Creators: name: Умарова, Замира
Publisher: name: Zenodo
Year: 2024

description: Как известно, хроническая болезнь почек (ХБП)  характеризуется неуклонным прогрессированием с исходом в терминальную стадию и   возникновением зависимости от "искусственной почки”. Распространенность ХБП сопоставима с такими социально значимыми заболеваниями, как  артериальная  гипертензия и сахарный диабет. В связи с этим важной частью является выявление различных аспектов качества жизни у больных ХБП  Качество  жизни  (КЖ)  –  сложное  междисциплинарное понятие.
3+1 Approach to the Long Wavelength Iteration Scheme
Creators: name: Comer, G. L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Large-scale inhomogeneities and anisotropies are modeled using the Long Wavelength Iteration Scheme. In this scheme solutions are obtained as expansions in spatial gradients, which are taken to be small. It is shown that the choice of foliation for spacetime can make the iteration scheme more effective in two respects: (i) the shift vector can be chosen so as to dilute the effect of anisotropy on the late-time value of the extrinsic curvature of the spacelike hypersurfaces of the foliation; and (ii) pure gauge solutions present in a similar calculation using the synchronous gauge vanish when the spacelike hypersurfaces have extrinsic curvature with constant trace. We furthermore verify the main conclusion of the synchronous gauge calculation which is large-scale inhomogeneity decays if the matter--considered to be that of a perfect-fluid with a barotropic equation of state--violates the strong-energy condition. Finally, we obtain the solution for the lapse function and discuss its late-time behaviour. It is found that the lapse function is well-behaved when the matter violates the strong energy condition.
description: 21 pages, TeX file, already published
Developing magnetic resonance and optical imaging techniques for measuring macromolecule uptake by the artery wall
Creators: name: Dazzi, Marta
Publisher: name: Imperial College London
Year: 2019

description: Elevated arterial macromolecule uptake is an early event in the atherosclerotic process that could be critical to predicting its evolution. In vivo imaging may identify arterial uptake and provide an early biomarker of the atherosclerotic disease. Current approaches, based on confocal microscopy are too invasive for investigational studies in humans. An MRI-based technique using an albumin-binding contrast agent, gadofosveset trisodium, is a more feasible strategy. However, at the clinical dose, only 75% of the contrast agent is bound to albumin which adversely affects measurements. Effects of unbound gadofosveset can be removed by applying a previously developed mathematical model, the Proton Relaxation Enhancement algorithm. The algorithm, which requires quantitative parametric mapping of the vessel, was validated in phantoms of arterial permeability, where the MR signal was successfully de-composed into concentration maps of bound and unbound gadofosveset. It was subsequently applied to the brachiocephalic artery of rats with healthy and injured endothelium. In order to validate the results, an alternative method was also developed using 3D confocal microscopy imaging of rhodamine-albumin uptake by the intact healthy vessel. Since the confocal method displayed high sensitivity and spatial resolution, uptake was compared spatially with MRI. For both modalities, albumin uptake occurred approximately along the inner curvature of the vessel, but correlations were not statistically significant. Arterial wall voxels may have been affected by partial volume artefacts brought about by the low spatial resolution. Despite this shortcoming, the study showed that MRI exhibited elevated uptake in injured animals compared to their healthy counterparts. In conclusion, the Proton Relaxation Enhancement algorithm applied to imaging the uptake of albumin- binding contrast agents is promising, particularly to assess injured endothelium. The adoption of novel multi-parametric quantitative MR sequences with high spatial and temporal resolution is also desirable. The methods developed herein may be instrumental in our advancement in understanding atherogenesis.
MENUING SOFTWARE: APPLICATION TO THE GENERAL MANAGER'S NEED
Creators: name: Fuller, Earl I.
name: Fuller, Earl I.
Publisher: name: Unknown
Year: 1990
Subjects: Research Methods/ Statistical Methods

description: This paper demonstrates a robust approach to general manager computer use. The approach is shown to systematically integrate a diverse collection of user selected applications. It is implemented through the use of currently available shareware and public domain software at low cost. The developed prototype follows accepted psychological choice, Management Information System (MIS) and/or Decision Support System (DDS) principles. It is easily modified by a user, said to be any general management team member, as the environment changes. Team member roles, concerns, styles, and interests can be accommodated in the design or re-design. The prototype and approach is friendly to occasional users. One basic installation can serve several users. It will work on a network of computers. It offers a sense of staying in control to the individual. Complexities of application choice and access are hidden. Data transfer between applications is automated. Extension educators and business consultants can also use a similar approach for accessing a wide variety of applications. Further work will likely improve the basic approach. In the meantime, the gain from using this approach as it stands is quickly available.
MINNESOTA AGRICULTURAL GROWTH, 1880-1970
Creators: name: Fitzharris, Joseph C.
name: Fitzharris, Joseph C.
Publisher: name: Unknown
Year: 1976
Subjects: Community/Rural/Urban Development

description: The growth of Minnesota's agricultural sector, 1880-1970, was quite considerable. More important than providing a history, this study provides the necessary background for examination of the agricultural research system of Minnesota. Here, the record will be detailed. This study examines, in turn, the record of: output and production; the factors of production; relative output and input prices changes; and the structural changes in the sector
Multi-scale coarse-graining of diblock copolymer self-assembly: from monomers to ordered micelles
Creators: name: Pierleoni, Carlo
name: Addison, Chris
name: Hansen, Jean-Pierre
name: Krakoviack, Vincent
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Starting from a microscopic lattice model, we investigate clustering, micellization and micelle ordering in semi-dilute solutions of AB diblock copolymers in a selective solvent. To bridge the gap in length scales, from monomers to ordered micellar structures, we implement a two-step coarse graining strategy, whereby the AB copolymers are mapped onto ``ultrasoft'' dumbells with monomer-averaged effective interactions between the centres of mass of the blocks. Monte Carlo simulations of this coarse-grained model yield clear-cut evidence for self-assembly into micelles with a mean aggregation number n of roughly 100 beyond a critical concentration. At a slightly higher concentration the micelles spontaneously undergo a disorder-order transition to a cubic phase. We determine the effective potential between these micelles from first principles.
description: 4 pages, 4 figures, submitted to Phys. Rev. Letts
OnRAMP for Regulating AI in Medical Products
Creators: name: Higgins, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: Methodology (stat.ME)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: I.2.1; J.3

description: Medical Artificial Intelligence (AI) involves the application of machine learning algorithms to biomedical datasets in order to improve medical practices. Products incorporating medical AI require certification before deployment in most jurisdictions. To date, clear pathways for regulating medical AI are still under development. Below the level of formal pathways lies the actual practice of developing a medical AI solution. This Perspective proposes best practice guidelines for development compatible with the production of a regulatory package which, regardless of the formal regulatory path, will form a core component of a certification process. The approach is predicated on a statistical risk perspective, typical of medical device regulators, and a deep understanding of machine learning methodologies. These guidelines will allow all parties to communicate more clearly in the development of a common Good Machine Learning Practice (GMLP), and thus lead to the enhanced development of both medical AI products and regulations.
description: 46 pages, 3 tables, 1 figure. Published in Advanced Intelligent Systems, July 2021. (See DOI link)
COST BENEFIT ANALYSIS FOR THE MINNESOTA RAIL SERVICE IMPROVEMENT PROGRAM METHODOLOGY AND A CASE STUDY
Creators: name: Fruin, Jerry E.
name: Garry, Gordon
name: Easter, K. William
name: Jensen, Harald R.
name: Fruin, Jerry E.
name: Garry, Gordon
name: Easter, K. William
name: Jensen, Harald R.
Publisher: name: Unknown
Year: 1977
Subjects: Public Economics

description: The objective of this study is to develop a methodology for evaluating the economic feasibility of participating in the Minnesota Rail Service Improvement Program by eligible individuals or groups.
The role of Quantum Interference in Quantum Computing
Creators: name: Shiekh, A. Y.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Computational Complexity (cs.CC)
subject: Quantum Physics (quant-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Quantum interference is proposed as a tool to augment Quantum Computation.
description: 3 pages, no figures (citation added)
title: Not only Iranian rise in science marred by fraud
title: misconduct is a global problem
titleType: AlternativeTitle
Creators: name: Larijani, Bagher
name: Niaz, Kamal
name: Pourabbasi, Ata
name: Khan, Fazlullah
name: Spoor, Jonathan
name: Abdollahi, Mohammad
Publisher: name: Technische Universität Dortmund
Year: 2017
Subjects: subject: 610

description: EXCLI Journal;Vol. 16 2017
title: Ανάπτυξη μεθόδων χωρο-κειμενικής ευρετηρίασης σε μη-σχεσιακές βάσεις δεδομένων
title: Development of methods for spatio-textual indexing in NoSQL stores
titleType: AlternativeTitle
Creators: name: Νεστοράκης, Κωνσταντίνος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Spatio-textual queries
subject: Spatio-textual indexing
subject: NoSQL stores
subject: MongoDB
subject: HBase
subject: Hilbert curve
subject: Boolean range queries
subject: Space-filling curve

description: Στις μέρες μας, υπάρχουν πολλές εταιρείες πληροφορικής που χρησιμοποιούν GPS υπηρεσίες στα προϊόντα που προσφέρουν στους πελάτες τους. Το πιο χαρακτηριστικό παράδειγμα είναι εταιρεία Google με την εφαρμογή Google maps. Η βασική υπηρεσία της εφαρμογής, είναι να παρέχει οδηγίες μεταφοράς στους χρήστες της, από ένα γεωγραφικό στίγμα σε ένα άλλο. Επίσης, παραδείγματα είναι οι εταιρείες Uber και Beat που προσφέρουν υπηρεσίες οδικής μεταφοράς των πελατών τους, από ένα σημείο σταθμό σε κάποιον προορισμό. Οι συγκεκριμένες εφαρμογές κατά την εκτέλεση τους επεξεργάζονται γεωγραφικά δεδομένα. Ένα απλό ερώτημα που μπορεί να εκτελέσει η εφαρμογή Google maps είναι μια αναζήτηση των πλησιέστερων cafe από ένα σημείο στίγματος, Αντίστοιχα, για τις εφαρμογές Uber και Beat, ο πελάτης μπορεί να θέλει να επιλέξει το φύλλο του οδηγού που θα εκτελέσει την οδική μεταφορά π.χ. να είναι γυναίκα. Εύκολα μπορεί να αντιληφθεί κάποιος ότι οι συγκεκριμένες εφαρμογές πέρα από γεωγραφικά δεδομένα, επεξεργάζονται και κειμενικά δεδομένα. Φυσικά, επεξεργάζονται και χρονική πληροφορία αλλά αυτό δεν θα εξεταστεί στη συγκεκριμένη διπλωματική εργασία. Η αποθήκευση και η επεξεργασία όλων αυτών των δεδομένων, από τις συγκεκριμένες εφαρμογές που αναφέρθηκαν στην προηγούμενη παράγραφο, απαιτούν βάσεις δεδομένων που προσφέρουν υψηλή απόδοση (performance), διαθεσιμότητα (availability) και επεκτασιμότητα (scalability). Ένα Σχεσιακό σύστημα διαχείρισης βάσεων δεδομένων (Relational Database Management System) δεν μπορεί να καλύψει τις συγκεκριμένες ανάγκες. Σε αντίθεση με τις NoSQL βάσεις δεδομένων όπου η χρήση τους, ενδείκνυται για τέτοιου είδους δεδομένα. Η ιδιαιτερότητα των NoSQL βάσεων δεδομένων, είναι ότι δεν διαθέτουν όλες απευθείας χωρική ή χωρο-κειμενική ευρετηρίαση, αλλά παρέχουν τεχνικές που μπορούν να υποστηρίξουν τέτοιου είδους δυνατότητες. Σε αυτή την διπλωματική, θα παρουσιαστούν τεχνικές ευρετηρίασης πάνω σε χωρο-κειμενικά δεδομένα. Αυτές οι τεχνικές θα υλοποιηθούν πάνω στο NoDA API [1] για MongoDB και HBase Stores, επεκτείνοντας προηγούμενη δουλεία της Big Data ερευνητικής ομάδας του Πανεπιστημίου Πειραιώς, πάνω σε χωρο-κειμενικά δεδομένα. To NoDA API είναι ένα ενδιάμεσο επίπεδο ανάμεσα στην εφαρμογή και τα NoSQL Stores υποστηρίζοντας χωρο-χρονικές και χωρο-κειμενικές τεχνικές ευρετηρίασης.
A Data Set and a Convolutional Model for Iconography Classification in Paintings
Creators: name: Milani, Federico
name: Fraternali, Piero
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Iconography in art is the discipline that studies the visual content of artworks to determine their motifs and themes andto characterize the way these are represented. It is a subject of active research for a variety of purposes, including the interpretation of meaning, the investigation of the origin and diffusion in time and space of representations, and the study of influences across artists and art works. With the proliferation of digital archives of art images, the possibility arises of applying Computer Vision techniques to the analysis of art images at an unprecedented scale, which may support iconography research and education. In this paper we introduce a novel paintings data set for iconography classification and present the quantitativeand qualitative results of applying a Convolutional Neural Network (CNN) classifier to the recognition of the iconography of artworks. The proposed classifier achieves good performances (71.17% Precision, 70.89% Recall, 70.25% F1-Score and 72.73% Average Precision) in the task of identifying saints in Christian religious paintings, a task made difficult by the presence of classes with very similar visual features. Qualitative analysis of the results shows that the CNN focuses on the traditional iconic motifs that characterize the representation of each saint and exploits such hints to attain correct identification. The ultimate goal of our work is to enable the automatic extraction, decomposition, and comparison of iconography elements to support iconographic studies and automatic art work annotation.
description: Published at ACM Journal on Computing and Cultural Heritage (JOCCH) https://doi.org/10.1145/3458885
Pseudobulges in the Disk Galaxies NGC 7690 and NGC 4593
Creators: name: Kormendy, John
name: Cornell, Mark E.
name: Block, David L.
name: Knapen, Johan H.
name: Allard, Emma L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present Ks-band surface photometry of NGC 7690 (Hubble type Sab) and NGC 4593 (SBb). We find that, in both galaxies, a major part of the "bulge" is as flat as the disk and has approximately the same color as the inner disk. In other words, the "bulges" of these galaxies have disk-like properties. We conclude that these are examples of "pseudobulges" -- that is, products of secular dynamical evolution. Nonaxisymmetries such as bars and oval disks transport disk gas toward the center. There, star formation builds dense stellar components that look like -- and often are mistaken for -- merger-built bulges but that were constructed slowly out of disk material. These pseudobulges can most easily be recognized when, as in the present galaxies, they retain disk-like properties. NGC 7690 and NGC 4593 therefore contribute to the growing evidence that secular processes help to shape galaxies. NGC 4593 contains a nuclear ring of dust that is morphologically similar to nuclear rings of star formation that are seen in many barred and oval galaxies. The nuclear dust ring is connected to nearly radial dust lanes in the galaxy's bar. Such dust lanes are a signature of gas inflow. We suggest that gas is currently accumulating in the dust ring and hypothesize that the gas ring will starburst in the future. The observations of NGC 4593 therefore suggest that major starburst events that contribute to pseudobulge growth can be episodic.
description: 10 pages, 3 Postscript figures; requires emulateapj.cls, apjfonts.sty, and psfig.sty; accepted for publication in ApJ; for a version with full resolution figures, see http://chandra.as.utexas.edu/~kormendy/n7690.pdf
Regulatory RNAs controlling vascular (dys)function by affecting TGF-ß family signalling
Creators: name: Kurakula, Kondababu
name: Goumans, Marie-Jose
name: Ten Dijke, Peter
Publisher: name: Technische Universität Dortmund
Year: 2015
Subjects: subject: microRNA
subject: cardiovascular disease
subject: transforming growth factor-β
subject: bone morphogenetic protein
subject: endothelial cells
subject: smooth muscle cells
subject: 610

description: Cardiovascular disease (CVD) is a leading cause of morbidity and mortality worldwide. Over the last few years, microRNAs (miRNAs) have emerged as master regulators of gene expression in cardiovascular biology and di¬sease. miRNAs are small endogenous non-coding RNAs that usually bind to 3′ untranslated region (UTR) of their target mRNAs and inhibit mRNA stability or translation of their target genes. miRNAs play a dynamic role in the pathophysiology of many CVDs through their effects on target mRNAs in vascular cells. Recently, numerous miRNAs have been implicated in the regulation of the transforming growth factor-β (TGF-β)/bone morphogenetic protein (BMP) signalling pathway which plays crucial roles in diverse biological processes, and is involved in pathogenesis of many diseases including CVD. This review gives an overview of current literature on the role of miRNAs targeting TGF-β/BMP signalling in vascular cells, including endothelial cells and smooth muscle cells. We also provide insight into how this miRNA-mediated regulation of TGF-β/BMP signalling might be used to harness CVD.
description: EXCLI Journal;Vol. 14, 2015
Quantum synchronization
Creators: name: Zhirov, O. V.
name: Shepelyansky, D. L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Using the methods of quantum trajectories we study numerically the phenomenon of quantum synchronization in a quantum dissipative system with periodic driving. Our results show that at small values of Planck constant $\hbar$ the classical devil's staircase remains robust with respect to quantum fluctuations while at large $\hbar$ values synchronization plateaus are destroyed. Quantum synchronization in our model has close similarities with Shapiro steps in Josephson junctions and it can be also realized in experiments with cold atoms.
description: 5 pages, 5 figs, 1 fig added, research at http://www.quantware.ups-tlse.fr
title: Μέθοδοι πολυμεταβλητής ανάλυσης επιχειρηματικών δεδομένων
title: Methods for multivariate analysis of business data
titleType: AlternativeTitle
Creators: name: Παπούλια, Καλλιόπη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Ανάλυση κατά συστάδες
subject: Διαχωριστική ανάλυση
subject: Παλινδρόμηση

description: Η παρούσα εργασία αναφέρεται σε μεθόδους πολυμεταβλητής στατιστικής ανάλυσης. Η πολυμεταβλητή στατιστική ανάλυση αποτελεί ένα πολύτιμο εργαλείο για πολλές επιστήμες και βιομηχανίες. Περιλαμβάνει πολλές μεθόδους ανάλογα με το πρόβλημα που χρήζει αντιμετώπισης. Αποτελείται από πολλές μεθοδολογίες και ποικίλες διαδικασίες κατάλληλες για χρήση πολλών μεταβλητών με στόχο την εξαγωγή αποτελεσμάτων και την στατιστική συμπερασματολογία. Συγκεκριμένα στη διπλωματική αυτή εργασία, αρχικά παρουσιάζεται το θεωρητικό υπόβαθρο των κυριότερων πολυμεταβλητών μεθόδων, δηλαδή βασικοί όροι, περιγραφή και προϋποθέσεις που απαιτούνται για την εφαρμογή τους. Μέθοδοι όπως είναι η λογιστική παλινδρόμηση, η ανάλυση συστάδων, η διαχωριστική ανάλυση και άλλα. Επιπρόσθετα γίνεται αναφορά και περιγραφή πραγματικών προβλημάτων που επιλύθηκαν με τις προαναφερθείσες μεθόδους σε διάφορες βιομηχανίες όπως τηλεπικοινωνίες, τουριστικές επιχειρήσεις, περιβάλλον και άλλα. Τέλος, η εργασία ολοκληρώνεται με ανάλυση δεδομένων με χρήση των μεθόδων και με τη βοήθεια του στατιστικού πακέτου SPSS MODELER.
Random-gate-voltage induced Al'tshuler-Aronov-Spivak effect in topological edge states
Creators: name: Luo, Kun
name: Chen, Wei
name: Sheng, Li
name: Xing, D. Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Helical edge states are the hallmark of the quantum spin Hall insulator. Recently, several experiments have observed transport signatures contributed by trivial edge states, making it difficult to distinguish between the topologically trivial and nontrivial phases. Here, we show that helical edge states can be identified by the random-gate-voltage induced $Φ_0/2$-period oscillation of the averaged electron return probability in the interferometer constructed by the edge states. The random gate voltage can highlight the $Φ_0/2$-period Al'tshuler-Aronov-Spivak oscillation proportional to $\sin^2(2πΦ/Φ_0)$ by quenching the $Φ_0$-period Aharonov-Bohm oscillation. It is found that the helical spin texture induced $π$ Berry phase is key to such weak antilocalization behavior with zero return probability at $Φ=0$. In contrast, the oscillation for the trivial edge states may exhibit either weak localization or antilocalization depending on the strength of the spin-orbit coupling, which have finite return probability at $Φ=0$. Our results provide an effective way for the identification of the helical edge states. The predicted signature is stabilized by the time-reversal symmetry so that it is robust against disorder and does not require any fine adjustment of system.
description: 8 pages and 7 figures
Interstellar Polarization and the Position Angle Orientations of Seyfert 1 Galaxies
Creators: name: Hoffman, Jennifer L.
name: Chornock, Ryan
name: Leonard, Douglas C.
name: Filippenko, Alexei V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We comment on recent spectropolarimetric studies that compare the observed polarization position angles (PAs) of Seyfert 1 galaxies near H alpha with the observed orientations of their radio source axes on the sky. For a Seyfert galaxy in which scattering occurs mainly in an equatorial scattering region, one expects the polarization PA to be parallel to the radio axis, while in a case in which light scatters predominantly in the polar regions, the H alpha polarization PA should be perpendicular to the radio axis. In practice, these correlations are difficult to establish because a Galactic interstellar polarization contribution can introduce a significant uncertainty into the polarization PA determination, even when the magnitude of interstellar polarization is small. We show how such uncertainties may affect the analysis of PA alignments and present spectropolarimetric observations of a probe star along the line of sight to the Seyfert 1 galaxy Mrk 871 that allow us to assess the intrinsic H alpha polarization and PA of Mrk 871. These results suggest that spectropolarimetric observations of such probe stars should form an integral part of future Seyfert galaxy polarization studies.
description: 15 pages, 3 figures, accepted by MNRAS; made small corrections to the derived ISP of Mrk 871 and other minor revisions in response to the referee's recommendations
Es geht um Haltungsänderungen. Interview mit Peter Röhrig
Creators: name: Beywl, Wolfgang
Publisher: name: ZIEL
Year: 2023
Subjects: subject: 370 - Erziehung, Schul- und Bildungswesen

description: Es ist eine wichtige Aufgabe von Lehrenden, Studierende so zu führen, dass sie fähig sind, Verantwortung für ihr Studium zu übernehmen. Insbesondere Sprechstundensituationen bieten hier ein großes Potenzial. In seinen Workshops möchte Peter Röhrig deshalb den Lehrenden zeigen, wie man in einen wirklichen Dialog mit den Studierenden kommen kann, um sie so in die Lage zu versetzen, Neues zu schaffen. Die richtige Haltung und die richtigen Fragen vonseiten der Lehrenden sind hierbei essenziell.
Multilayer Network Analysis for Improved Credit Risk Prediction
Creators: name: Óskarsdóttir, María
name: Bravo, Cristián
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We present a multilayer network model for credit risk assessment. Our model accounts for multiple connections between borrowers (such as their geographic location and their economic activity) and allows for explicitly modelling the interaction between connected borrowers. We develop a multilayer personalized PageRank algorithm that allows quantifying the strength of the default exposure of any borrower in the network. We test our methodology in an agricultural lending framework, where it has been suspected for a long time default correlates between borrowers when they are subject to the same structural risks. Our results show there are significant predictive gains just by including centrality multilayer network information in the model, and these gains are increased by more complex information such as the multilayer PageRank variables. The results suggest default risk is highest when an individual is connected to many defaulters, but this risk is mitigated by the size of the neighbourhood of the individual, showing both default risk and financial stability propagate throughout the network.
description: 24 pages, 15 figures. v4 - accepted
Vehicular Cooperative Perception Through Action Branching and Federated Reinforcement Learning
Creators: name: Abdel-Aziz, Mohamed K.
name: Perfecto, Cristina
name: Samarakoon, Sumudu
name: Bennis, Mehdi
name: Saad, Walid
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Cooperative perception plays a vital role in extending a vehicle's sensing range beyond its line-of-sight. However, exchanging raw sensory data under limited communication resources is infeasible. Towards enabling an efficient cooperative perception, vehicles need to address the following fundamental question: What sensory data needs to be shared?, at which resolution?, and with which vehicles? To answer this question, in this paper, a novel framework is proposed to allow reinforcement learning (RL)-based vehicular association, resource block (RB) allocation, and content selection of cooperative perception messages (CPMs) by utilizing a quadtree-based point cloud compression mechanism. Furthermore, a federated RL approach is introduced in order to speed up the training process across vehicles. Simulation results show the ability of the RL agents to efficiently learn the vehicles' association, RB allocation, and message content selection while maximizing vehicles' satisfaction in terms of the received sensory information. The results also show that federated RL improves the training process, where better policies can be achieved within the same amount of time compared to the non-federated approach.
description: 31 pages (single column, double space), 9 figures, accepted for publication in IEEE Transactions on Communication
Backlund Transformations, D-Branes, and Fluxes in Minimal Type 0 Strings
Creators: name: Carlisle, James E.
name: Johnson, Clifford V.
name: Pennington, Jeffrey S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the Type 0A string theory in the (2,4k) superconformal minimal model backgrounds, focusing on the fully non-perturbative string equations which define the partition function of the model. The equations admit a parameter, Gamma, which in the spacetime interpretation controls the number of background D-branes, or R-R flux units, depending upon which weak coupling regime is taken. We study the properties of the string equations (often focusing on the (2,4) model in particular) and their physical solutions. The solutions are the potential for an associated Schrodinger problem whose wavefunction is that of an extended D-brane probe. We perform a numerical study of the spectrum of this system for varying Gamma and establish that when Gamma is a positive integer the equations' solutions have special properties consistent with the spacetime interpretation. We also show that a natural solution-generating transformation (that changes Gamma by an integer) is the Backlund transformation of the KdV hierarchy specialized to (scale invariant) solitons at zero velocity. Our results suggest that the localized D-branes of the minimal string theories are directly related to the solitons of the KdV hierarchy. Further, we observe an interesting transition when Gamma=-1.
description: 17 pages, 3 figures
Determination and mechanisms of trauma-induced glial cell death in the developing chick central nervous system
Creators: name: McBride, Christopher Barry
Publisher: name: University of British Columbia
Year: 2009

description: Traumatic injuries to the central nervous system can lead to debilitating and often irreversible neurological deficits, which result from a poorly understood, multifactorial degenerative response. Although the initial cellular damage incurred by the traumatic event is instantaneous, a secondary, protracted degenerative phase can greatly exacerbate tissue damage and functional impairment. A recently described feature of this secondary response is the delayed apoptotic death of white matter oligodendrocytes remote from the lesion. This highly regulated, stereotyped form of cell death is thought to be executed by the caspase family of intracellular proteases. To investigate the role of caspases in injury-induced oligodendrocyte apoptosis, I developed an in vivo model of spinal cord injury in the developing chick embryo. Increased developmental apoptosis in the cervical spinal cord was observed in the cervical white matter between embryonic days 13-18, which correlated with the period of myelination of the spinal cord. Following transection during this period, a large increase in apoptotic cells was detected primarily in the ventrolateral and ventromedial white matter for several spinal cord segments caudal to the injury. Double labeling of apoptotic cells with cell specific antibodies revealed a large number of the dying cells to be oligodendrocytes but not astrocytes. In ovo application of caspase inhibitors significantly attenuated the transection-induced apoptotic response in the white matter remote from the lesion, but did not affect developmental apoptosis. Caspase-3-like catalytic activity was a component of the apoptotic response in this region following transection, and immunostaining for the active form of caspase-3 revealed its presence in an increased number of cells following injury. All cells expressing activated caspase-3 were apoptotic, and were distributed in the same region of spinal cord white matter as apoptotic oligodendrocytes. These results indicate oligodendrocytes undergo a period of heightened sensitivity to traumatic injury that correlates with the period of developmental oligodendrocyte apoptosis and with myelination of the spinal cord, and that caspases appear to mediate their death after trauma. The embryonic chick model of neurotrauma developed in this thesis may be used to further understand the mechanisms of oligodendrocyte death and survival in degenerative conditions characterized by oligodendrocyte apoptosis.
On New Physics Contributions to the Higgs Decay to $Zγ$
Creators: name: Archer-Smith, Paul
name: Stolarski, Daniel
name: Vega-Morales, Roberto
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore models of new physics that can give rise to large (100% or more) enhancements to the rate of Higgs decay to $Zγ$ while still being consistent with other measurements. We show that this is impossible in simple models with one additional multiplet and also in well motivated models such as the MSSM and folded SUSY. We do find models with several multiplets that carry electroweak charge where such an enhancement is possible, but they require destructive interference effects. We also show that kinematic measurements in Higgs decay to four leptons can be sensitive to such models. Finally we explore the sensitivity of four lepton measurements to supersymmetric models and find that while the measurement is difficult with the high luminosity LHC, it may be possible with a future high energy hadron collider.
description: 13 pages, 6 figures
Localized Langerhans cell histiocytosis masquerading as Brodie s abscess in a 2-year-old child: a case report
Creators: name: Chang, Wei-Fang
name: Hsu, Yi-Chih
name: Wu, Yi-Der
name: Kuo, Chun-Lang
name: Huang, Guo-Shu
Publisher: name: Technische Universität Dortmund
Year: 2016
Subjects: subject: knee pain
subject: Langerhans cell histiocytosis
subject: Brodie’s abscess
subject: penumbra sign
subject: differential diagnosis
subject: 610

description: Langerhans cell histiocytosis (LCH), formerly known as histiocytosis X, refers to a spectrum of diseases characterized by idiopathic proliferation of histiocytes that produce either focal (localized LCH) or systemic manifestations (Hand–Schüller–Christian disease and Letterer–Siwe disease). Localized LCH accounts for approximately 60–70 % of all LCH cases. Osseous involvement is the most common manifestation and typically involves the flat bones, along with lesions of the skull, pelvis, and ribs. Localized LCH in bone shows a wide spectrum of clinical manifestations and radiologic features that may mimic those of infections as well as benign and malignant tumors. The diagnostic imaging findings of localized LCH are also diverse and challenging. The penumbra sign is a common and characteristic magnetic resonance imaging (MRI) feature of Brodie’s abscess, but is rarely seen in localized LCH. In this report, we describe a case of localized LCH misdiagnosed as Brodie’s abscess in a 2-year-old child based on clinical symptoms, laboratory findings, and pre-diagnostic MRI findings (penumbra sign). Therefore, the penumbra sign is not sufficient to clearly establish the diagnosis of Brodie’s abscess, and the differential diagnosis of localized LCH should be considered when a child with an osteolytic lesion presents with a penumbra sign.
description: EXCLI Journal;Vol. 15, 2016
Περιγραφή λειτουργίας αποθήκης εμπορικής εταιρείας. Μελέτη περίπτωσης: ATHANASSIOU SA
Creators: name: Μυλωνάς, Απόστολος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Logistics
subject: Διαχείριση αποθήκης
subject: Συστήματα αποθήκευσης

description: Η συγκεκριμένη εργασία μελετάει την έννοια και τις διαδικασίες που συνθέτουν τις λειτουργίες αποθήκης εμπορικής εταιρείας. Η έρευνα ξεκινάει με ορισμένους πολύ σημαντικούς ορισμούς σχετικά με τα Logistics και τις εφοδιαστικές αλυσίδες. Στην συνέχεια, περνάει στην διοίκηση των αποθηκών των επιχειρήσεων και των συστημάτων αποθήκευσης. Σε αυτό το πλαίσιο περιγράφονται διαδικασίες όπως είναι οι παραλαβές, οι τύποι των εμπορευμάτων, η αποθήκευση τους, τα πλεονεκτήματα και τα μειονεκτήματα της ύπαρξης αποθεμάτων για μια επιχείρηση. Στην συνέχεια, αναλύονται ορισμένα συστήματα αποθήκευσης, αναφέρονται τα είδη αποθηκών, οι τύποι των οχημάτων που χρησιμοποιούνται και η σημασία των ανθρωπίνων πόρων στην διοίκηση αποθηκών. Τέλος, παρουσιάζονται οι λειτουργίες της αποθήκης της εμπορικής εταιρείας ΑΘΑΝΑΣΙΟΥ ΕΑΕ ως επίρρωση των θεωρητικών αναφορών.
Probing the cosmic microwave background temperature using the Sunyaev-Zeldovich effect
Creators: name: Horellou, Cathy
name: Nord, Martin
name: Johansson, Daniel
name: Levy, Anna
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the possibility to constrain the relation between redshift and temperature of the cosmic microwave background (CMB) using multifrequency Sunyaev-Zeldovich (SZ) observations. We have simulated a catalog of clusters of galaxies detected through their SZ signature assuming the sensitivities that will be achieved by the {\it Planck} satellite at 100, 143 and 353 GHz, taking into account the instrumental noise and the contamination from the Cosmic Infrared Background and from unresolved radiosources. We have parametrized the cosmological temperature-redshift law as $T\propto (1+z)^{(1-a)}$. Using two sets of SZ flux density ratios (100/143 GHz, which is most sensitive to the parametrization of the $T-z$ law, and 143/353 GHz, which is most sensitive to the peculiar velocities of the clusters) we show that it is possible to recover the $T-z$ law assuming that the temperatures and redshifts of the clusters are known. From a simulated catalog of $\sim 1200$ clusters, the parameter $a$ can be recovered to an accuracy of 10$^{-2}$. Sensitive SZ observations thus appear as a potentially useful tool to test the standard law. Most cosmological models predict a linear variation of the CMB temperature with redshift. The discovery of an alternative law would have profound implications on the cosmological model, implying creation of energy in a manner that would still maintain the black-body shape of the CMB spectrum at redshift zero.
description: 8 pages, 9 figures, submitted to A&A
AGRI-ENVIRONMENTAL POLICY IN GERMANY - SOIL AND WATER CONSERVATION -
Creators: name: Weingarten, Peter
name: Weingarten, Peter
Publisher: name: Unknown
Year: 1997
Subjects: Environmental Economics and Policy

description: This paper is concerned with agri-environmental policy in Germany and focuses in particular on soil and water conservation. At first it discusses to what extent agriculture contributes to erosion and the pollution of surface waters and groundwater with nutrients and pesticides. Whereas erosion is a minor problem in Germany water pollution due to modern and intensive agriculture is of major concern. In theory, a broad range of environmental policy instruments exists. In practice, agri-environmental policy in Germany is dominated by command-and-control-measures, whereas incentivebased measures are of minor importance. In this paper recent developments of the most important legal and institutional settings concerning soil and water conservation policies are surveyed with special emphasis on the Federal Water Act and the Implementation of the EU Nitrate Directive into German legislation by the Fertilizer Ordinance. Since the Common Agricultural Policy (CAP) of the EU heavily affects farm structure, production intensity and regional specialization in agriculture, agri-environmental issues cannot be discussed without taking into account agricultural policy. Hence, the paper argues, that for different reasons the CAP is likely to become more environmentally friendly in future. Furthermore, impacts of alternative water conservation policies are investigated by using a regionalized agricultural sector model. Information obtained by the model analysis cover the development of nitrogen balances, potential nitrate concentrations in the soil percolation water, potentially resulting costs and effects on the agricultural incomes in the former FRG on the county level.
Η γέννηση της τρομοκρατίας στις Ισλαμικές χώρες και τα αίτια επίθεσης στη Δύση
Creators: name: Ζακζάγκη, Κερασίνα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Τρομοκρατία
subject: Ισλάμ
subject: Φονταμενταλισμός

description: Τα τελευταία χρόνια ολοένα και αυξάνονται οι ανησυχίες γύρω από τις διαστάσεις που λαμβάνει το φαινόμενο της διεθνούς τρομοκρατίας και ειδικότερα οι τρομοκρατικές ενέργειες που προέρχονται από εξτρεμιστικές ισλαμικές ομάδες. Τα πρόσφατα τρομοκρατικά χτυπήματα σε χώρες του δυτικού κόσμου έχουν καταστήσει επιτακτική την ανάγκη για την ερμηνεία και την κατανόηση του φαινομένου της τρομοκρατίας, με σκοπό τον περιορισμό και εν συνεχεία την αποτροπή παρόμοιων ενεργειών στο μέλλον. Μέσα σε αυτό το πλαίσιο, η παρούσα μελέτη επιχειρεί να προσφέρει μια συνολική εικόνα, με αφετηρία τις διάφορες ερμηνευτικές προσεγγίσεις γύρω από την έννοια και το φαινόμενο της τρομοκρατίας, ενδιάμεσο σταθμό την εξέταση του ισλαμικού φονταμενταλισμού και την σχέση του με την τρομοκρατία και τελικό προορισμό την κατανόηση των ενδεχόμενων αιτιών της τρομοκρατίας.
Spin Disorder and Magnetic Anisotropy in Fe3O4 Nanoparticles
Creators: name: Lima, E.
name: Brandl, A. L.
name: Arelaro, A. D.
name: Goya, G. F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have studied the magnetic behavior of dextran-coated magnetite (Fe$_3$O$_4$) nanoparticles with median particle size $\left=8$ $nm$. Magnetization curves and in-field Mössbauer spectroscopy measurements showed that the magnetic moment $M_S$ of the particles was much smaller than the bulk material. However, we found no evidence of magnetic irreversibility or non-saturating behavior at high fields, usually associated to spin canting. The values of magnetic anisotropy $K_{eff}$ from different techniques indicate that surface or shape contributions are negligible. It is proposed that these particles have bulk-like ferrimagnetic structure with ordered A and B sublattices, but nearly compensated magnetic moments. The dependence of the blocking temperature with frequency and applied fields, $T_B(H,ω)$, suggests that the observed non-monotonic behavior is governed by the strength of interparticle interactions.
description: 11 pages, 7 figures, 3 Tables