cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
DTEN: a network-based workflow to identify drug target networks from gene expression data in rare disease
Creators: name: Gosline, Sara J. C.
name: Allaway, Robert
name: Guinney, Justin
Publisher: name: F1000 Research Limited
Year: 2019

description: Identification of drug targets from preclinical ‘omics data remains a chronic challenge within the research community. This challenge stems from multiple causes including inherent noise in genomic assays, inability to generalize experiment-specific data to a broader context, and difficulty in determining specific relationships between gene expression changes and molecular pathway dysregulation. Network- based algorithms can be used to address these points by first integrating ‘omics data with published molecular interaction data and then selecting specific pathways that are relevant to the disease of interest. Integration of protein-protein, protein-DNA or protein-RNA interactions together with network refinement approaches such as those based on network flow, belief propagation, or other graph-theoretical constructs such as Steiner Trees, provide distinct interpretations of molecular data that can enable scientists to develop better testable hypotheses.
In this work, we extend existing network tools to incorporate drug-target interactions into network-optimization algorithms that can identify specific drugs of interest from a set of differentially expressed genes. We apply this algorithm to study Neurofibromatosis Type 1 (NF1), a tumor-causing syndrome affecting 1 in 3000 people. In rare diseases such as NF1, there exist modest numbers of samples, giving rise to a greater need for integrative algorithms. Despite the collection of transcriptomic data across numerous types of NF1 tumors, to date, no single analysis has compared all tumor samples to each other. As such, we built a scientific workflow comprised of existing network tools and customizations to compare these data and identify specific drugs that putatively target these diseases.
Resilient quantum gates on periodically driven Rydberg atoms
Creators: name: Wu, Jin-Lei
name: Wang, Yan
name: Han, Jin-Xuan
name: Su, Shi-Lei
name: Xia, Yan
name: Jiang, Yongyuan
name: Song, Jie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Fault-tolerant implementation of quantum gates is one of preconditions for realizing quantum computation. The platform of Rydberg atoms is one of the most promising candidates for achieving quantum computation. We propose to implement a controlled-$Z$ gate on Rydberg atoms where an amplitude-modulated field is employed to induce Rydberg antiblockade. Gate robustness against the fluctuations in the Rydberg-Rydberg interaction can be largely enhanced by adjusting amplitude-modulated field. Furthermore, we introduce a Landau-Zener-Stückelberg transition on the target atom so as to improve the gate resilience to the deviation in the gate time and the drift in the pulse amplitude. With feasible experimental parameters, one can achieve the gate with low fidelity errors caused by atomic decay, interatomic dipole-dipole force, and Doppler effects. Finally, we generalize the gate scheme into multiqubit cases, where resilient multiqubit phase gates can be obtained in one step with an unchanged gate time as the number of qubits increases.
Bistable phase control via rocking in a nonlinear electronic oscillator
Creators: name: Buldu, Javier M.
name: Staliunas, K.
name: Casals, J. A.
name: Garcia-Ojalvo, Jordi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We experimentally demonstrate the effective rocking of a nonlinear electronic circuit operating in a periodic regime. Namely, we show that driving a Chua circuit with a periodic signal, whose phase alternates (also periodically) in time, we lock the oscillation frequency of the circuit to that of the driving signal, and its phase to one of two possible values shifted by pi, and lying between the alternating phases of the input signal. In this way, we show that a rocked nonlinear oscillator displays phase bistability. We interpret the experimental results via a theoretical analysis of rocking on a simple oscillator model, based on a normal form description (complex Landau equation) of the rocked Hopf bifurcation
description: 7 pages, 10 figures
Μελέτη συστημάτων επιχειρηματικής ευφυΐας – δυνατότητες και προοπτικές:
Creators: name: Βλαχοπούλου, Ευαγγελία Θεόδωρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Επιχειρηματική ευφυΐα
Business intelligence

description: Οι ανάγκες της σύγχρονης εποχής απαιτούν γρήγορη, αποδοτική και συνεπή διαχείριση του τεράστιου όγκου πληροφοριών και των κάθε είδους δεδομένων από την πλευρά των επιχειρήσεων. Στον πυρήνα αυτού του ζητήματος βρίσκεται η Επιχειρηματική Ευφυΐα. Πρόκειται για στρατηγικά πληροφοριακά συστήματα, τα οποία στοχεύουν στην υποστήριξη και βελτιστοποίηση της διαδικασίας λήψης αποφάσεων και στην ενίσχυση του ανταγωνιστικού πλεονεκτήματος των επιχειρήσεων. Η τεχνολογία αυτή περιλαμβάνει ένα σύνολο από εφαρμογές και μεθοδολογίες που αναλύουν και επεξεργάζονται δεδομένα και τα οποία οδηγούν στην ανακάλυψη γνώσης. Η Επιχειρηματική Ευφυΐα επιτρέπει να μοιράζεται η πληροφορία σε συνεργάτες, πελάτες και επιχειρησιακούς συμμάχους, έτσι ώστε όλα τα συμμετέχοντα μέρη να μπορούν άμεσα να λαμβάνουν καλύτερες και ορθότερες επιχειρηματικές αποφάσεις. Προκειμένου να αξιοποιηθεί με τον καλύτερο δυνατό τρόπο η πληροφόρηση, η επιχείρηση θα πρέπει επιλέξει και να υλοποιήσει και την κατάλληλη εφαρμογή λογισμικού βάσει της αποθήκης δεδομένων και της υποδομής που διαθέτει. Μια ευρέως χρησιμοποιούμενη σουίτα Επιχειρηματικής Ευφυΐας ανοιχτής πηγής είναι η Pentaho BI Suite Enterprise Edition, μέσω της οποίας ο χρήστης έχει πρόσβαση σε εκτενείς αναλύσεις, αναφορές, πίνακες και εργαλεία ενοποίησης δεδομένων
description: In today’s changing environment enterprises need to manage quickly, efficiently and consistently the vast volume of information and data. At the core of this issue is business intelligence. Business intelligence refers to strategic information systems, which aim to support and optimize decision-making process and strengthen the competitive advantage of firms. The technology includes a set of applications and methodologies, which analyze and process data and lead to the discovery of knowledge. Through business intelligence, firms may share information with partners, customers and business allies, so that all parties involved can readily make better and more robust business decisions. In order to make the right decisions, an organization must select and implement the appropriate software application based on its data warehouse and infrastructure. A widely used suite of open source business intelligence is the Pentaho BI Suite Enterprise Edition, through which the user has access to extensive analysis, reports, tables and data integration tools.
Παράγοντες αθηροσκλήρωσης
Creators: name: Μεγάλου, Αικατερίνη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Αθηροσκλήρωση
Υπερλιπιδαιμία
Απολιποπρωτεΐνες
Atherosclerosis
Hyperlipidemia
Apolipoproteins

description: Η αθηροσκλήρωση είναι μια προοδευτική πολυπαραγοντική διαδικασία που αρχίζει κατά την παιδική ηλικία και καταλήγει σε ένα φάσμα σοβαρών αγγειακών παθήσεων που αποτελούν την κύρια αιτία θανάτου στις Δυτικές χώρες. Στον 20ο αιώνα σημειώθηκε μια αξιοσημείωτη εξέλιξη στις θεωρίες που αφορούν στην παθογένεση της αθηροσκλήρωσης. Η παρούσα διπλωματική εργασία περιλαμβάνει δέκα κεφάλαια. Στα πέντε πρώτα κεφάλαια περιγράφεται η μοριακή βιολογία της αθηροσκλήρωσης. Το έκτο κεφάλαιο περιλαμβάνει μια σύντομη ανάλυση του όρου παράγοντας κινδύνου. Στο έβδομο και όγδοο κεφάλαιο περιγράφονται οι συμβατικοί παράγοντες κινδύνου, όπως το κάπνισμα , η υπέρταση, η υπερλιπιδαιμία, το μεταβολικό σύνδρομο, ο διαβήτης, η παχυσαρκία, το νοητικό στρες και η κατάθλιψη, και αναλύεται η επίδρασή τους στην αθηροσκληρωτική διαδικασία. Στο ένατο κεφάλαιο γίνεται αναφορά σε νεότερους παράγοντες, όπως η hsCRP, η ομοκυστεΐνη, η λιποπρωτεΐνη (α), και άλλους φλεγμονώδεις παράγοντες. Στο δέκατο κεφάλαιο αναφέρονται επιδημιολογικά στοιχεία που προέκυψαν από ποσοτικούς προσδιορισμούς βιοχημικών δεικτών (της hsCRP, της ομοκυστεΐνης , της λιποπρωτεΐνης (α), της απολιποπρωτεΐνης Α-1 και της απολιποπρωτεΐνης- Β) σε ασθενείς που υπέστησαν καρδιαγγειακό σύμβαμα και νοσηλεύτηκαν για το λόγο αυτό στο Γενικό Νοσοκομείο Δράμας κατά την εξαετία 2004 – 2009 και εξάγονται τα σχετικά συμπεράσματα.
description: Atherosclerosis is a progressive multifactor process which begins during childhood and ends at a spectrum of severe vascular diseases which are the main cause of mortality in Western countries. During 20th century there was a remarkable evolution in theories involving atherosclerosis and its pathogenesis. The present study consists of ten chapters. In the first five of them the molecular biology of atherosclerosis is being described. Chapter six briefly analyses the term risk factor. In chapters 7 and 8 risk factors like smoking, hypertension, dyslipidemia, metabolic syndrome, diabetes, obesity, mental stress, and depression are being described and their impact on the process of atherosclerosis is analysed. In chapter 9 newer risk factors, like hsCRP, homocystein, lipoprotein(a) and other inflammatory factors are mentioned. In chapter 10 we report epidemiological data which derived from quantitative measurements of biochemical markers (hsCRP, homocysteine, lipoprotein a, apolipoprotein A-1 and apolipoprotein –B) in patients who suffered a heart attack and were hospitalized for this reason in Drama General Hospital between the years 2004-2009 and we come to relative conclusions.
Exceptional entanglement phenomena: non-Hermiticity meeting non-classicality
Creators: name: Han, Pei-Rong
name: Wu, Fan
name: Huang, Xin-Jie
name: Wu, Huai-Zhi
name: Zou, Chang-Ling
name: Yi, Wei
name: Zhang, Mengzhen
name: Li, Hekang
name: Xu, Kai
name: Zheng, Dongning
name: Fan, Heng
name: Wen, Jianming
name: Yang, Zhen-Biao
name: Zheng, Shi-Biao
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-Hermitian (NH) extension of quantum-mechanical Hamiltonians represents one of the most significant advancements in physics. During the past two decades, numerous captivating NH phenomena have been revealed and demonstrated, but all of which can appear in both quantum and classical systems. This leads to the fundamental question: what NH signature presents a radical departure from classical physics? The solution of this problem is indispensable for exploring genuine NH quantum mechanics, but remains experimentally untouched so far. Here, we resolve this basic issue by unveiling distinct exceptional entanglement phenomena, exemplified by an entanglement transition, occurring at the exceptional point of NH interacting quantum systems. We illustrate and demonstrate such purely quantum-mechanical NH effects with a naturally dissipative light-matter system, engineered in a circuit quantum electrodynamics architecture. Our results lay the foundation for studies of genuinely quantum-mechanical NH physics, signified by exceptional-point-enabled entanglement behaviors.
Group classification of the Sachs equations for a radiating axisymmetric, non-rotating, vacuum space-time
Creators: name: Ibragimov, Nail H.
name: Wessels, Ewald J. H.
name: Ellis, George F. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We carry out a Lie group analysis of the Sachs equations for a time-dependent axisymmetric non-rotating space-time in which the Ricci tensor vanishes. These equations, which are the first two members of the set of Newman-Penrose equations, define the characteristic initial-value problem for the space-time. We find a particular form for the initial data such that these equations admit a Lie symmetry, and so defines a geometrically special class of such spacetimes. These should additionally be of particular physical interest because of this special geometric feature.
description: 18 Pages. Submitted to Classical and Quantum Gravity
Description and analysis of novelties introduced in DCASE Task 4 2022 on the baseline system
Creators: name: Ronchini, Francesca
name: Cornell, Samuele
name: Serizel, Romain
name: Turpault, Nicolas
name: Fonseca, Eduardo
name: Ellis, Daniel P. W.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: The aim of the Detection and Classification of Acoustic Scenes and Events Challenge Task 4 is to evaluate systems for the detection of sound events in domestic environments using an heterogeneous dataset. The systems need to be able to correctly detect the sound events present in a recorded audio clip, as well as localize the events in time. This year's task is a follow-up of DCASE 2021 Task 4, with some important novelties. The goal of this paper is to describe and motivate these new additions, and report an analysis of their impact on the baseline system. We introduced three main novelties: the use of external datasets, including recently released strongly annotated clips from Audioset, the possibility of leveraging pre-trained models, and a new energy consumption metric to raise awareness about the ecological impact of training sound events detectors. The results on the baseline system show that leveraging open-source pretrained on AudioSet improves the results significantly in terms of event classification but not in terms of event segmentation.
From Stationary Phase to Steepest Descent
Creators: name: Kamvissis, Spyridon
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Our aim here is to clarify the distinction between the nonlinear-stationary-phase idea and the nonlinear-steepest-descent idea, stressing the importance of actual steepest-descent contours in some problems. We mostly use the nonlinear Schrödinger equation as our working model, but we also digress to the KdV equation at some point. This is a slightly revised version of a review paper that will appear in the forthcoming volume (Contemporary Mathematics, AMS) honoring Percy Deift.
description: Dedicated to Percy Deift on his 60th birthday
Τιμολόγηση εξωτικών δικαιωμάτων:
Creators: name: Παπαδοπούλου, Χριστίνα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Ευρωπαϊκό δικαίωμα
Τόπος του Ito
Ουδέτερο ως προς τον κίνδυνο μέτρο πιθανότητας
Δικαιώματα φράγματος
Αναδρομικά δικαιώματα
Κίνηση Μπράουν
Martingales
Brownian motion
Itos formula
European option
Risk neutral measure
Barrier options
Lookback options

description: Η τιμολόγηση των δικαιωμάτων και συγκεκριμένα των εξωτικών, τα οποία παρουσιάζουν μεγάλη ποικιλομορφία και ανάπτυξη, αποτελεί ένα σημαντικό στοχαστικό πρόβλημα που απασχολεί τράπεζες και χρηματιστηριακούς οργανισμούς διαφόρων χωρών. Η τιμολόγηση θα πρέπει να γίνεται με τέτοιο τρόπο ώστε να διατηρείται η ισορροπία στις οικονομικές αγορές και να επιτυγχάνεται η εξασφάλιση έναντι του ρίσκου που μπορεί να προκύψει. Αυτή η έρευνα για εύρεση αναλυτικής μορφής τιμολόγησης των διάφορων ειδών εξωτικών δικαιωμάτων μπορεί να οδηγήσει σε πολύπλοκους υπολογισμούς. Σε αυτήν την εργασία θα ασχοληθούμε με την τιμολόγηση των δικαιωμάτων φράγματος και των αναδρομικών δικαιωμάτων σε χρόνο συνεχή. Αρχικά παρατηρούμε ότι η αναγόμενη στο μηδέν αξία των δικαιωμάτων αυτών είναι ένα martingale σε σχέση με το ουδέτερο ως προς τον κίνδυνο μέτρο πιθανότητας και αυτό μας οδηγεί σε μια στοχαστική διαφορική εξίσωση με μερικές παραγώγους του τύπου Black-Scholes-Merton. Παρόλα αυτά τα αναδρομικά παράγωγα εμφανίζουν μια επιπλέον μεταβλητή σε αυτήν την εξίσωση της αξίας του δικαιώματος. Για το λόγο αυτό θα προβούμε σε μείωση της διάστασης αυτής της εξίσωσης. Τέλος και για τα δύο δικαιώματα θα βρούμε την αξία τους με αναλυτικούς υπολογισμούς.
description: Options pricing and more precisely the pricing of the exotic options which present various forms and great development, consists an important stochastic problem for banks and stock exchange organizations all over the world. Options pricing must be done in such a way so that the equilibrium of the stock exchange markets will be preserved and the hedging against the risk that may appear will be attained. This search for explicit pricing formulas for the different exotic options can lead to complex computations. In this thesis we will study the pricing of the barrier and the lookback options in continuous time. Firstly we notice that the discounted option price is a martingale under the risk neutral measure and this leads to a partial differential equation of the Black-Scholes-Merton type. However the lookback option equation has an additional state variable in this equation for this reason we are going to reduce the dimension. Finally, for both barrier and lookback options the option price will be computed explicitly.
Properties of the Hyades, the eclipsing binary HD27130, and the oscillating red giant $ε$ Tau
Creators: name: Brogaard, K.
name: Pakštienė, E.
name: Grundahl, F.
name: Mikolaitis, Š.
name: Tautvaišienė, G.
name: Slumstrup, D.
name: Talens, G. J. J.
name: VandenBerg, D. A.
name: Miglio, A.
name: Arentoft, T.
name: Kjeldsen, H.
name: Janulis, R.
name: Drazdauskas, A.
name: Marchini, A.
name: Minkevičiūtė, R.
name: Stonkutė, E.
name: Bagdonas, V.
name: Andersen, M. Fredslund
name: Jessen-Hansen, J.
name: Pallé, P. L.
name: Dorval, P.
name: Snellen, I. A. G.
name: Otten, G. P. P. L.
name: White, T. R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Eclipsing binary stars allow derivation of accurate and precise masses and radii. When they reside in star clusters, properties of even higher precision, along with additional information, can be extracted. Asteroseismology of solar-like oscillations offers similar possibilities for single stars. We improve the previously established properties of the Hyades eclipsing binary HD27130 and re-assess the asteroseismic properties of the giant star $ε$ Tau. The physical properties of these members of the Hyades are then used to constrain the helium content and age of the cluster. New multi-colour light curves were combined with multi-epoch radial velocities to yield masses and radii of HD27130. $T_{\rm eff}$ was derived from spectroscopy and photometry, and verified using the Gaia parallax. We estimate the cluster age from re-evaluated asteroseismic properties of $ε$ Tau while using HD27130 to constrain the helium content. The masses and radii, and $T_{\rm eff}$ of HD 27130 were found to be $M=1.0245\pm0.0024 M_{\odot}$, $R=0.9226\pm0.015 R_{\odot}$, $T_{\rm eff}=5650\pm50$ K for the primary, and $M=0.7426\pm0.0016 M_{\odot}$, $R=0.7388\pm0.026 R_{\odot}$, $T_{\rm eff}=4300\pm100$ K for the secondary component. Our re-evaluation of $ε$ Tau suggests that the previous literature estimates are trustworthy, and that the Hipparcos parallax is more reliable than the Gaia DR2 parallax. The helium content of HD27130 and thus of the Hyades is found to be $Y=0.27$ but with significant model dependence. Correlations with the adopted metallicity results in a robust helium enrichment law with $\frac{ΔY}{ΔZ}$ close to 1.2. We estimate the age of the Hyades to be 0.9 $\pm$ 0.1 (stat) $\pm$ 0.1 (sys) Gyr in slight tension with recent age estimates based on the cluster white dwarfs. (abridged)
description: 14 pages, 8 figures, accepted for publication in Astronomy & Astrophysics
On the relative role of the physical mechanisms on complex biodamage induced by carbon irradiation
Creators: name: Taioli, Simone
name: Trevisanutto, Paolo E.
name: de Vera, Pablo
name: Simonucci, Stefano
name: Abril, Isabel
name: Garcia-Molina, Rafael
name: Dapor, Maurizio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The effective use of swift ion beams in cancer treatment (known as hadrontherapy) as well as an appropriate protection in manned space missions rely on the accurate understanding of energy delivery to cells damaging their genetic information. The key ingredient characterizing the response of a medium to the perturbation induced by charged particles is its electronic excitation spectrum. By using linear response time-dependent density functional theory, we obtain the energy and momentum transfer excitation spectrum (the energy-loss function, ELF) of liquid water (main constituent of biological tissues), in excellent agreement with experimental data. The inelastic scattering cross sections obtained from this ELF, together with the elastic scattering cross sections derived considering the condensed phase nature of the medium, are used to perform accurate Monte Carlo simulations of the energy deposited by swift carbon ions in liquid water and carried away by the generated secondary electrons producing inelastic events (ionization, excitation, and dissociation electron attachment, DEA), strongly correlated with cellular death, which are scored in sensitive volumes having the size of two DNA convolutions. The sizes of clusters of damaging events for a wide range of carbon ion energies, from those relevant to hadrontherapy up to cosmic radiation, predict with unprecedented statistical accuracy the nature and relative magnitude of the main inelastic processes contributing to radiation biodamage, confirming that ionization accounts for the vast majority of complex damage. DEA, typically regarded as a very relevant biodamage mechanism, surprisingly plays a minor role in carbon-ion induced clusters of harmful events.
description: 8 pages, 5 figures, includes Supplementary Information (4 pages, 1 figure)
Reducing the complexity of equilibrium problems and applications to best approximation problems
Creators: name: Fodor, Valerian-Alin
name: Popovici, Nicolae
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 52A20, 41A50, 46N10, 90C33

description: We consider scalar equilibrium problems governed by a bifunction in a finite-dimensional framework. By using classical arguments in Convex Analysis, we show that under suitable generalized convexity assumptions imposed on the bifunction, the solutions of the equilibrium problem can be characterized by means of extreme or exposed points of the feasible domain. Our results are relevant for different particular instances, such as variational inequalities and optimization problems, especially for best approximation problems.
The development of a solid phase screening assay for the detection of dipeptide synthesis
Creators: name: Yue, Eliza
Publisher: name: University of British Columbia
Year: 2009

description: A rapid screening assay was developed to detect formation of DNP-asn-leu dipeptides on a special type of microtiter plate, called the Nunc Immuno Module. Secondary amino groups, to which small molecules can be coupled, were grafted onto the surface of the plate. The carboxyl group on L-leucine molecules, activated in the presence of 0.1 M N-hydroxysuccinimide (NHS) and l-ethyl-3-(3-dimethylaminopropyl)-carbodiimide, were covalently coupled to these amino groups; 11.04 fxq of L-Leucine was used in the coupling reaction. The reaction mixture, consisting of either commercial grade thermolysin or crude protease mixture isolated from Bacillus subtilis culture, DNP(dinitrophenyl)-L-asparagine and pH 6 sodium acetate buffer solution, was subseguently added to the wells. During incubation at 48°C, dipeptide formation occurred between the immobilized leucine and the free DNP-L-asparagine in the liquid phase. After washing off unreacted DNP-L-asparagine, the final product was detected by the addition of an antibody-peroxidase conjugate, which reacted specifically with the dinitrophenyl group attached to the amino group of the asparagine molecule. The amount of increase in optical density measured at 492 nm was proportional to the relative amount of dipeptides formed on the microtiter plate. Two-way analysis of variance showed that the effect of enzymatic treatment on the mean optical density measured at 492 nm was significant (P<0.01).
The evolution of very massive stars
Creators: name: Belkus, H.
name: Van Bever, J.
name: Vanbeveren, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Core collapse of dense massive star clusters is unavoidable and this leads to the formation of massive objects, with a mass up to 1000 $\msun$ and even larger. When these objects become stars, stellar wind mass loss determines their evolution and final fate, and decides upon whether they form black holes (with normal mass or with intermediate mass) or explode as a pair instability supernova. In the present paper, we discuss the evolution of very massive stars and we present a convenient evolution recipe that can be implemented in a gravitational N-body code to study the dynamics of dense massive clusters.
description: 16 pages, 4 figures, 2 tables. Accepted by ApJ
Το τμήμα διοικητικής λογιστικής με εργαλεία διαχείρισης όπως ERP συμβάλλει στη δημιουργία προστιθέμενης αξίας στην επιχείρηση.: το τμήμα διοικητικής λογιστικής αποτελεί ένα νέο περιουσιακό στοιχείο της επιχείρησης στα πλαίσια της στρατηγικής διοικητικής λογιστικής. Αποτελεί τμήμα της επιχείρησης με μεγάλη και καθοριστική συμβολή στη λήψη αποφάσεων
Creators: name: Γραμματικού, Δάφνη Αστερίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Στρατηγική διοικητική λογιστική
Λογιστικά πληροφοριακά συστήματα
Προστιθέμενη αξία
Strategic management accounting
Enterprise resource planning
Intangible assets

description: Η διπλωματική αυτή εργασία εκπονήθηκε στα πλαίσια του Μεταπτυχιακού Προγράμματος «Οικονομία και Διοίκηση» του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης με σκοπό την παρουσίαση και ανάλυση εργαλείων διαχείρισης όπως συστημάτων ERP και τη συμβολή αυτών στη δημιουργία προστιθέμενης αξίας για την επιχείρηση. Παρουσιάζεται το ζήτημα των άυλων στοιχείων του ενεργητικού, η σπουδαιότητα και η αποτίμησή τους στα πληροφοριακά συστήματα , καθώς και η δηµιουργία προστιθέµενης αξίας με μία εμπειρική έρευνα βασισμένη στην εταιρία OTS AE . Τέλος, υπολογίζονται σημαντικοί χρηματοοικονομικοί δείκτες, που δίνουν χρήσιμα συμπεράσματα για τη κατάσταση της εταιρίας.
description: This research study is conducted within the purposes of postgraduate program of “Economics and Management” of Aristotle University of Thessaloniki in order to present an analysis and the use of management tools such as ERP systems and help companies attain their goal in evaluating intangible assets. Therefore the issue of intangible assets is being presented, its importance, their evaluation in information systems and the relation of goodwill and value added services through an empirical research based on a software supplier company called OTS SA. Finally, key financial indicators have been calculated with useful conclusions of the company’ s financial profile.
Zero-Bias Deep Learning for Accurate Identification of Internet of Things (IoT) Devices
Creators: name: Liu, Yongxin
name: Wang, Jian
name: Li, Jianqiang
name: Song, Houbing
name: Yang, Thomas
name: Niu, Shuteng
name: Ming, Zhong
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The Internet of Things (IoT) provides applications and services that would otherwise not be possible. However, the open nature of IoT make it vulnerable to cybersecurity threats. Especially, identity spoofing attacks, where an adversary passively listens to existing radio communications and then mimic the identity of legitimate devices to conduct malicious activities. Existing solutions employ cryptographic signatures to verify the trustworthiness of received information. In prevalent IoT, secret keys for cryptography can potentially be disclosed and disable the verification mechanism. Non-cryptographic device verification is needed to ensure trustworthy IoT. In this paper, we propose an enhanced deep learning framework for IoT device identification using physical layer signals. Specifically, we enable our framework to report unseen IoT devices and introduce the zero-bias layer to deep neural networks to increase robustness and interpretability. We have evaluated the effectiveness of the proposed framework using real data from ADS-B (Automatic Dependent Surveillance-Broadcast), an application of IoT in aviation. The proposed framework has the potential to be applied to accurate identification of IoT devices in a variety of IoT applications and services. Codes and data are available in IEEE Dataport.
description: Accepted for publication by IEEE IoTJ on August, 2020. Data and codes are hosted at: [1] Yongxin Liu, Jian Wang, Houbing Song, Shuteng Niu, Thomas Yang, "A 24-hour signal recording dataset with labels for cybersecurity and IoT", IEEE Dataport, 2020. [Online]. Available: http://dx.doi.org/10.21227/gt9v-kz32. Accessed: Aug. 27, 2020
An Improved Limit on Invisible Decays of Positronium
Creators: name: Badertscher, A.
name: Crivelli, P.
name: Fetscher, W.
name: Gendotti, U.
name: Gninenko, S.
name: Postoev, V.
name: Rubbia, A.
name: Samoylenko, V.
name: Sillou, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The results of a new search for positronium decays into invisible final states are reported. Convincing detection of this decay mode would be a strong evid ence for new physics beyond the Standard Model (SM): for example the existence of extra--dimensions, of milli-charged particles, of new light gauge bosons or of mirror particles. Mirror matter could be a relevant dark matter candidate. In this paper the setup and the results of a new experiment are presented. In a collected sample of about $(6.31\pm0.28) \times 10^6$ orthopositronium decay s, no evidence for invisible decays in an energy window [0,80] keV was found and an upper limit on the branching ratio of orthopositronium \invdecay could be set: $\binvdecay<4.2\times 10^{-7}$ (90% C.L.) Our results provide a limit on the photon mirror-photon mixing strength $ε\leq 1.55\times 10^{-7}$ (90% C.L.) and rule out particles lighter than the electron mass with a fraction $Q_x \leq 3.4 \times 10^{-5}$ of the electron charge. Furthermore, upper limits on the branching ratios for the decay of parapositronium $Br(p-Ps\to invisible)\leq 4.3 \times 10^{-7}$ (90% C.L.) and the direct annihilation $Br(e^+e^-\to invisible)\leq 2.1 \times 10^{-8}$ (90% C.L.) could be set.
description: 17 pages, 7 figures, added references, fixed limit on millicharged particles and changed two plots accordingly
K(E10), Supergravity and Fermions
Creators: name: Damour, Thibault
name: Kleinschmidt, Axel
name: Nicolai, Hermann
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the fermionic extension of the E10/K(E10) coset model and its relation to eleven-dimensional supergravity. Finite-dimensional spinor representations of the compact subgroup K(E10) of E(10,R) are studied and the supergravity equations are rewritten using the resulting algebraic variables. The canonical bosonic and fermionic constraints are also analysed in this way, and the compatibility of supersymmetry with local K(E10) is investigated. We find that all structures involving A9 levels 0,1 and 2 nicely agree with expectations, and provide many non-trivial consistency checks of the existence of a supersymmetric extension of the E10/K(E10) coset model, as well as a new derivation of the `bosonic dictionary' between supergravity and coset variables. However, there are also definite discrepancies in some terms involving level 3, which suggest the need for an extension of the model to infinite-dimensional faithful representations of the fermionic degrees of freedom.
description: 50 pages
Η κρίση του ελληνικού χρηματιστηρίου στην χρηματοοικονομική συμπεριφορά του τραπεζικού κλάδου:
Creators: name: Γερονικολάου, Δάφνη Λάμπρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Χρηματοοικονομική κρίση
Διεθνής αγορά
Ελληνική οικονομια
Παγκόσμια οικονομία
Διατραπεζική αγορά
Στεγαστική πίστη
Global economy
Crisis
Credit risk
Interbank market

description: Το 2008 εξελίχθηκε σε μια εξαιρετικά δύσκολη χρονιά για τη παγκόσμια οικονομία, με σημαντική επιβράδυνση της οικονομικής δραστηριότητας. Η κρίση, η οποία ξεκίνησε το 2007 από την αμερικανική αγορά ενυπόθηκης στεγαστικής πίστης υψηλού κινδύνου, εξελίχθηκε σε γενικευμένη κρίση ρευστότητας κατά το 2008, με ανεξέλεγκτες διαστάσεις. Η διεθνής αγορά αντιμετώπισε ουσιαστικά προβλήματα όπως η κατάρρευση διεθνών τραπεζικών ιδρυμάτων, η έλλειψη ρευστότητας και η άνοδος του κόστους των καταθέσεων. Η επίδραση της διεθνούς χρηματοπιστωτικής αναταραχής δεν θα μπορούσε να μην γίνει αισθητή και στην ελληνική οικονομία, επηρεάζοντας δυσμενώς τα βασικά μεγέθη του ελληνικού τραπεζικού τομέα, λόγω κυρίως της αύξησης του κόστους δανεισμού στην διατραπεζική αγορά. Με τη συγκεκριμένη διπλωματική εργασία μελετώνται τα αίτια και οι επιπτώσεις της διεθνούς χρηματοπιστωτικής κρίσης τόσο σε παγκόσμιο όσο και σε εθνικό επίπεδο. Στόχος της διπλωματικής εργασίας είναι να εξετάσει την πορεία των ελληνικών τραπεζών, συγκεκριμένα 13 ελληνικών εμπορικών τραπεζών των οποίων οι μετοχές διαπραγματεύονται στο Χρηματιστήριο Αθηνών, καθώς και πως αυτή επηρεάστηκε από την κρίση του 2008.
description: 2008 became an extremely difficult year for the global economy, with significant economic slowdown. The crisis, which started in 2007 by the American mortgage market for housing credit risk, has evolved to a general liquidity crisis in 2008, with rampant. The international market experienced substantial problems such as the collapse of international banking institutions, the lack of liquidity and the rising cost of deposits. The impact of international financial turmoil could not be less evident in the Greek economy, adversely affecting the fundamentals of the Greek banking sector, mainly due to increased borrowing costs in the interbank market. This thesis studies the causes and effects of international financial crisis globally and nationally. The aim of the thesis is to examine the financial situation of Greek banks, namely 13 Greek commercial banks whose shares are traded on the Athens Stock Exchange, and how it was affected by the crisis of 2008.
Shadow, quasinormal modes and quasiperiodic oscillations of rotating Kaluza-Klein black holes
Creators: name: Ghasemi-Nodehi, M.
name: Azreg-Aïnou, Mustapha
name: Jusufi, Kimet
name: Jamil, Mubasher
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we study the shadow of rotating Kaluza-Klein (KK) black holes and the connection between the shadow radius and the real part of quasi-normal modes (QNMs) in the eiokonal limit. In addition we have explored the quasi-periodic oscillations (QPOs) in the rotating KK black hole.
description: 15 pages, 14 captioned figures, to appear in Phys. Rev. D. arXiv admin note: text overlap with arXiv:2008.08450
Solution to a problem of Katona on counting cliques of weighted graphs
Creators: name: Borg, Peter
name: Feghali, Carl
name: Pellerin, Rémi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05D05, 05C35, 05C69

description: A subset $I$ of the vertex set $V(G)$ of a graph $G$ is called a $k$-clique independent set of $G$ if no $k$ vertices in $I$ form a $k$-clique of $G$. An independent set is a $2$-clique independent set. Let $π_k(G)$ denote the number of $k$-cliques of $G$. For a function $w: V(G) \rightarrow \{0, 1, 2, \dots\}$, let $G(w)$ be the graph obtained from $G$ by replacing each vertex $v$ by a $w(v)$-clique $K^v$ and making each vertex of $K^u$ adjacent to each vertex of $K^v$ for each edge $\{u,v\}$ of $G$. For an integer $m \geq 1$, consider any $w$ with $\sum_{v \in V(G)} w(v) = m$. For $U \subseteq V(G)$, we say that $w$ is uniform on $U$ if $w(v) = 0$ for each $v \in V(G) \setminus U$ and, for each $u \in U$, $w(u) = \left\lfloor m/|U| \right\rfloor$ or $w(u) = \left\lceil m/|U| \right\rceil$. Katona asked if $π_k(G(w))$ is smallest when $w$ is uniform on a largest $k$-clique independent set of $G$. He placed particular emphasis on the Sperner graph $B_n$, given by $V(B_n) = \{X \colon X \subseteq \{1, \dots, n\}\}$ and $E(B_n) = \{\{X,Y\} \colon X \subsetneq Y \in V(B_n)\}$. He provided an affirmative answer for $k = 2$ (and any $G$). We determine graphs for which the answer is negative for every $k \geq 3$. These include $B_n$ for $n \geq 2$. Generalizing Sperner's Theorem and a recent result of Qian, Engel and Xu, we show that $π_k(B_n(w))$ is smallest when $w$ is uniform on a largest independent set of $B_n$. We also show that the same holds for complete multipartite graphs and chordal graphs. We show that this is not true of every graph, using a deep result of Bohman on triangle-free graphs.
description: 14 pages, minor corrections made
Unified Model for Inflation and Dark Matter
Creators: name: Zsembinszki, Gabriel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a model which contains a new complex scalar field $Ψ$, interacting with a new real scalar field, $χ$, and an effective potential whose symmetry is almost exact, being explicitly broken by Planck-scale effects. We study the possibility of relating {\em inflation} with the {\em dark matter} of the universe. We find that for exponentially small explicit breaking, the model accounts for a period of inflation in the early universe and gives a dark matter candidate particle.
description: 16 pages, 2 figures, revtex4; more references added, minor changes in the text
Quantum phase slips in a resonant Josephson junction
Creators: name: Vakhtel, Tereza
name: van Heck, Bernard
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate the consequences of resonant tunneling of Cooper pairs on the quantum phase slips occurring in a Josephson junction. The amplitude for quantum tunneling under the Josephson potential barrier is modified by the Landau-Zener amplitude of adiabatic passage through an Andreev level crossing, resulting in the suppression of $2π$ phase slips. As a consequence, close to resonance, $4π$ phase slips become the dominant tunneling process. We illustrate this crossover by determining the energy spectrum of a transmon circuit, showing that a residual charge dispersion persists even at perfect transparency.
Renormalization group flow of Chern-Simons boundary conditions and generalized Ricci tensor
Creators: name: Pulmann, Ján
name: Ševera, Pavol
name: Youmans, Donald R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We find a Chern-Simons propagator on the ball with the chiral boundary condition. We use it to study perturbatively Chern-Simons boundary conditions related to 2-dim $σ$-models and to Poisson-Lie T-duality. In particular, we find their renormalization group flow, given by the generalized Ricci tensor. Finally we briefly discuss what happens when the Chern-Simons theory is replaced by a Courant $σ$-model or possibly by a more general AKSZ model.
description: 16 pages
Buckling transition in icosahedral shells subjected to volume conservation constraint and pressure: relations to virus maturation
Creators: name: Siber, Antonio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Minimal energy shapes of closed, elastic shells with twelve pentagonal disclinations introduced in otherwise hexagonally coordinated crystalline lattice are studied. The geometry and the total energy of shells are studied as a function of the elastic properties of the material they are made of. Particular emphasis is put on the buckling transition of the shells, that is a strong preference of the shell shapes to 'buckle out' in spatial regions close to the pentagonal disclinations for certain range of the elastic parameters of the problem. The transition effectively increases the mean square aspherity of shapes, making them look more like an icosahedron, rather than a sphere which is a preferred shape prior to the onset of the transition. The properties of the buckling transition are studied in cases when (i) the total volume enclosed by the elastic shell has to be fixed and when (ii) there is an internal pressure acting on the shell. This may be related to maturation process in non-enveloped dsDNA viruses, where the insertion of the genetic material in a pre-formed protein shell (viral coating) may effectively impose the fixed volume and/or pressure constraint. Several scenarios that may explain the experimentally observed feature of mature viruses being more aspherical (facetted) from their immature precursors are discussed and new predictions for the elastic properties of viral coatings are obtained on the basis of the presented studies.
description: Version that is published in Phys. Rev. E 73, 061915 (2006). Elastic parameters of viral coatings (HK97) reestimated (Y_3D=1.1 GPa)
Power-law decay of correlations after a global quench in the massive XXZ chain
Creators: name: Ramos, Flávia B.
name: Urichuk, Andrew
name: Schneider, Imke
name: Sirker, Jesko
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the relaxation dynamics of equal-time correlations in the antiferromagnetic phase of the XXZ spin-1/2 chain following a global quantum quench of the anisotropy parameter. We focus, in particular, on the relaxation dynamics starting from an initial Néel state. Using state-of-the-art density-matrix renormalization group simulations, the exact solution of an effective free-fermion model, and the quench-action approach within the thermodynamic Bethe ansatz, we show that the late-time relaxation is characterized by a power-law decay $\sim t^{-3/2}$ independent of anisotropy. This is in contrast to the previously studied exponential decay of the antiferromagnetic order parameter. Remarkably, the effective model describes the numerical data extremely well even on a quantitative level if higher order corrections to the leading asymptotic behavior are taken into account.
Commercial photography firms : their history, functions, and records
Creators: name: Woelk, Bonnie Faye
Publisher: name: University of British Columbia
Year: 2009

description: This thesis establishes a deductively-derived model of the common functions, activities, and records of commercial photography firms based on idealized patterns of activity. It traces the establishment of the functions, which have remained characteristic of this class of organization, from an historical perspective. Three distinctive functions, "attracting clients," "sustaining the organization," and "carrying out photography assignments" are analyzed in terms of component activities commonly engaged in by modern photography firms and possible records which may be generated and/or accumulate as a result of these activities. This analysis has significance for a number of areas of archival management, but confines itself to implications for appraisal for selection. It makes recommendations which encourage the preservation of a representative body of records that explains the organization and gives evidence of its activities. As is characteristic of all other archival documents, the records of a photography firm derive a great part of their nature from their relationships with the other documents in the fonds and to the functions and activities the fonds as a whole reflects. Examining the records produced by this type of creator in the context of their creation can reveal how both the photographic and non-photographic records are essential to the fonds, and can encourage the preservation of adequate documentation of the organization and its operation. A firm's photographs are generated by and are part of the production activities which fulfil the function of "carrying out photography assignments." They are related to a particular photography assignment and to the other records which show how that assignment was carried out. The photographs are also related to the records generated by the two other functions because these latter records reveal the activities in which the firm engages to enable it to carry out photography assignments. The marketing records indicate attempts by the firm to attract and acquire clients, some of which are successful and result in photography assignments. Records generated by component activities of "sustaining the organization" are related to the photos because they reflect activities which allow the firm to continue operating into the future and engage in its principal substantive function of "carrying out photography assignments."