cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Computational multiscale methods for quasi-gas dynamic equations
Creators: name: Chetverushkin, Boris
name: Chung, Eric
name: Efendiev, Yalchin
name: Pun, Sai-Mang
name: Zhang, Zecheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65M22, 65M60

description: In this paper, we consider the quasi-gas-dynamic (QGD) model in a multiscale environment. The model equations can be regarded as a hyperbolic regularization and are derived from kinetic equations. So far, the research on QGD models has been focused on problems with constant coefficients. In this paper, we investigate the QGD model in multiscale media, which can be used in porous media applications. This multiscale problem is interesting from a multiscale methodology point of view as the model problem has a hyperbolic multiscale term, and designing multiscale methods for hyperbolic equations is challenging. In the paper, we apply the constraint energy minimizing generalized multiscale finite element method (CEM-GMsFEM) combined with the leapfrog scheme in time to solve this problem. The CEM-GMsFEM provides a flexible and systematical framework to construct crucial multiscale basis functions for approximating the solution to the problem with reduced computational cost. With this approach of spatial discretization, we establish the stability of the fully discretized scheme under a relaxed version of the so-called CFL condition. Complete convergence analysis of the proposed method is presented. Numerical results are provided to illustrate and verify the theoretical findings.
description: 17 pages, 4 figures
Reconstructing the Thomson Optical Depth due to Patchy Reionization with 21-cm Fluctuation Maps
Creators: name: Holder, Gilbert
name: Iliev, Ilian T.
name: Mellema, Garrelt
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Large fluctuations in the electron column density can occur during the reionization process. We investigate the possibility of deriving the electron density fluctuations through detailed mapping of the redshifted 21-cm emission from the neutral medium during reionization. We find that the electron-scattering optical depth and 21-cm differential brightness temperature are strongly anti-correlated, allowing optical depth estimates based entirely on redshifted 21-cm measurements. This should help isolate the CMB polarization fluctuations that are due to reionization, allowing both cleaning of the patchy reionization polarization signal as a contaminating source of confusion to other signals and a measurement of the primordial quadrupole that would be measured at various locations in the universe at the epoch of reionization. This latter application in principle allows mapping of the primordial density field at z~1100 over a large fraction of the Hubble volume.
description: 4 pages, submitted to ApJL
minimal dataset
Creators: name: Zhu, Haiyan
Publisher: name: Zenodo
Year: 2024

description: This dataset is the minimal dataset created in response to the transparency and credibility requirements from the journal Plants.

 Standardized methods were employed during the data collection to ensure consistency and accuracy. All measurements were carefully recorded and reviewed before being compiled into the dataset.

The dataset is provided in Excel (.xlsx) format for ease of use, allowing researchers to filter, manipulate, and analyze the data as needed.
Brane Cosmology with a Non-Minimally Coupled Bulk-Scalar Field
Creators: name: Bogdanos, C.
name: Dimitriadis, A.
name: Tamvakis, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the cosmological evolution of a brane in the presence of a bulk scalar field coupled to the Ricci scalar through a term f(ϕ)R. We derive the generalized Friedmann equation on the brane in the presence of arbitrary brane and bulk-matter, as well as the scalar field equation, allowing for a general scalar potential V(phi). We focus on a quadratic form of the above non-minimal coupling and obtain a class of late-time solutions for the scale factor and the scalar field on the brane that exhibit accelerated expansion for a range of the non-minimal coupling parameter.
description: 15 pages
Time-Constant-Domain Spectroscopy: An Impedance-based Method for Sensing Biological Cells in Suspension
Creators: name: Ramírez-Chavarría, Roberto G.
name: Sánchez-Pérez, Celia
name: Romero-Ornelas, Luisa
name: Ramón-Gallegos, Eva
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Signal Processing (eess.SP)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Impedance measurement is a common technique to characterize and detect the electrical properties of biological cells. However, to decode the underlying physical processes, it requires complex electrical models alongside prior knowledge of the sample under study. In this work, we introduce an attractive label-free method for sensing biological cells in suspension based on the measurement of electrical impedance and the distribution of relaxation times (DRT) model. The DRT maps impedance data from the frequency-domain to a time-constant-domain spectrum (TCDS) being a useful and robust method for data analysis. We perform impedance measurements in the range from 1 kHz to 1 MHz to obtain the TCDS for sensing mimic samples as well as HeLa cells in suspension. Results show that the TCDS can be seen as an electrical fingerprint for the sample, as it can decode useful information about the composition and structure with high sensitivity and resolution.
description: 8 pages, 6 figures
Effects of alpha particles on the angular momentum loss from the Sun
Creators: name: Li, Bo
name: Li, Xing
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The classic Weber-Davis model of the solar wind is reconsidered by incorporating alpha particles and by allowing the solar wind to flow out of the equatorial plane in an axisymmetrical configuration. In the ion momentum equations of the solar wind, the ion gyro-frequency is many orders of magnitude higher than any other frequency. This requires that the difference between proton and alpha velocity vectors be aligned with the background magnetic field. With the aid of this alignment condition, the governing equations of the multi-fluid solar wind are derived from the standard transport equations. The governing equations are numerically solved along a prescribed meridional magnetic field line located at colatitude $70^\circ$ at 1AU and a steady state fast solar wind solution is found. A general analysis concludes, in agreement with the Weber-Davis model, that the magnetic field helps the coronal plasma to achieve an effective corotation out to the Alfvénic radius, where the poloidal Alfvénic Mach number $M_T$ equals unity ($M_T$ is defined by equation (\ref{eq:mach})). The model computations show that, magnetic stresses predominate the angular momentum loss of the Sun. For the fast wind considered, the proton contribution to the angular momentum loss, which can be larger than the magnetic one, is almost completely canceled by the alpha particles that develop an azimuthal speed in the direction opposite to the solar rotation. The Poynting flux associated with the azimuthal components is negligible in the energy budget. However, the solar rotation can play some role in reducing the relative speed between alpha particles and protons for low latitude fast solar wind streams in interplanetary space.
description: 12 pages, 4 figures, accepted for publication in A&A
Complexity and Floquet dynamics: non-equilibrium Ising phase transitions
Creators: name: Camilo, Giancarlo
name: Teixeira, Daniel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the time-dependent circuit complexity of the periodically driven transverse field Ising model using Nielsen's geometric approach. In the high-frequency driving limit the system is known to exhibit non-equilibrium phase transitions governed by the amplitude of the driving field. We analytically compute the complexity in this regime and show that it clearly distinguishes between the different phases, exhibiting a universal linear behavior at early times. We also evaluate the time averaged complexity, provide evidence of non-analytic behavior at the critical points, and discuss its origin. Finally, we comment on the freezing of quantum dynamics at specific configurations and on the use of complexity as a new tool to understand quantum phase transitions in Floquet systems.
description: 8 pages, 4 figures
High-order Dy multipole motifs observed in DyB2C2 with resonant soft x-ray Bragg diffraction
Creators: name: Mulders, A. M.
name: Staub, U.
name: Scagnoli, V.
name: Lovesey, S. W.
name: Balcar, E.
name: Nakamura, T.
name: Kikkawa, A.
name: van der Laan, G.
name: Tonnerre, J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Resonant soft x-ray Bragg diffraction at the Dy M4,5 edges has been exploited to study Dy multipole motifs in DyB2C2. Our results are explained introducing the intra-atomic quadrupolar interaction between the core 3d and valence 4f shell. This allows us to determine for the first time higher order multipole moments of dysprosium $4f$ electrons and to draw their precise charge density. The Dy hexadecapole and hexacontatetrapole moment have been estimated at -20% and +30% of the quadrupolar moment, respectively. No evidence for the lock-in of the orbitals at T_N has been observed, in contrast to earlier suggestions. The multipolar interaction and the structural transition cooperate along c but they compete in the basal plane explaining the canted structure along [110].
description: 4 pages, 3 figures
Τα κοινωνικοοικονομικά εγχειρήματα του τρίτου τομέα της οικονομίας σε συνάρτηση με τους όρους της φιλανθρωπίας και αλληλεγγύης:
Creators: name: Σεφεριάδου, Αγνή Απόστολου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Τρίτος τομέας της οικονομίας
Φιλανθρωπία
Αλληλεγγύη
Third sector of economy
Filanthropy
Solidarity

description: Σκοπός της παρούσας εργασίας είναι η μελέτη της πρακτικής αλλά και της ιδεολογικής και πολιτικής επένδυσης των εγχειρημάτων του τρίτου τομέα της οικονομίας. Για την πληρέστερη ωστόσο κατανόηση μιας μεγάλης σειράς πρωτοβουλιών και δράσεων κοινωνικής αλληλεγγύης με διάφορες μορφές, παρουσιάζεται αρχικά το κοινωνικο-οικονομικό πλαίσιο μέσα στο οποίο αυτές εμφανίζονται, η φάση (οικονομική κρίση) στα πλαίσια του καπιταλιστικού τρόπου παραγωγής όπου οι δράσεις αυτές επιχειρούν να προβληθούν ως τέτοιες που μπορούν να ανατρέψουν τον καπιταλισμό όπως επίσης και το θεωρητικό υπόβαθρο αυτών των εγχειρημάτων. Αναπτύσσονται οι εφαρμογές του τρίτου τομέα της οικονομία το πεδίο της παροχής κοινωνικών υπηρεσιών και στο πεδίο της εξάλειψης της ανεργίας, σαν πεδία που μπορούν να αποκαλύψουν η λογική μέσα στην οποία είναι ενταγμένος ο τρίτος τομέας της οικονομίας και η συσχέτισή του με τους όρους της φιλανθρωπίας και της αλληλεγγύης.
description: The aim of the present assignment is the study of the practical as well as the ideological and political investment the projects in the third sector of the economy. However for a fuller understanding of a great series of initiatives and actions of social solidarity in various forms, the socio-economic frame in which these actions appear is presented, the phase (financial crisis) within the capitalistic way of production where they attempt to be demonstrated as such that could overthrow capitalism as well as the theoretical background of these projects. Additionally, the applications of the third sector of the economy in the field of social welfare services and the elimination of hunger are developed in a way that could disclose the rationale behind which lies the third sector of the economy and its correlation with the terms of philanthropy and solidarity.
Metal-less Optical Left Handed Material by Low-dimensional Quantum Structure Anisotropy
Creators: name: Ginzburg, Pavel
name: Orenstein, Meir
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose a novel concept of left-handed metamaterial assembly by semiconductor based low-dimensional quantum structures. We theoretically demonstrate the left-handed material, combined from low-dimensional semiconductor quantum wells or quantum dots. One of the most important advantages of the proposed scheme is the possible controllability of material regime and the ability to invert the material losses to gain by using active, pumped quantum structure.
Buying Healthy Goats and Keeping Them That Way
Creators: name: Kerr, Susan
name: Kerr, Susan
Publisher: name: Unknown
Year: 2020
Subjects: subject: Livestock Production/Industries
subject: Production Economics
subject: Healthy Goats
subject: Herd Health
subject: Prevention of Diseases
subject: Biosecurity

description: Starting a goat herd with healthy animals prevents expense and effort eliminating infectious diseases. Pre-purchase testing and examinations are worth their cost because of the savings realized through fewer animal illnesses, increased production, lower medication costs, and reduced culling. Key management practices such as hoof trimming, vaccinating, body condition scoring, and assessing parasite loads are needed to maintain herd health. Biosecurity practices must become routine to prevent the introduction and/or spread of contagious diseases. Several goat diseases are contagious to humans, so biosecurity measures must address this concern. Excellent record-keeping helps producers monitor health and production trends, document treatments, make breeding vs. culling decisions, and produce food products without illegal residues. Starting with healthy animals, reducing exposure to contagious diseases, providing excellent nutrition, reducing stress, practicing management tasks, selecting for healthy animals, and monitoring animal’s daily health results in a goat herd consisting of animals rarely needing medical intervention.
Stage-wise Conservative Linear Bandits
Creators: name: Moradipari, Ahmadreza
name: Thrampoulidis, Christos
name: Alizadeh, Mahnoosh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Systems and Control (eess.SY)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We study stage-wise conservative linear stochastic bandits: an instance of bandit optimization, which accounts for (unknown) safety constraints that appear in applications such as online advertising and medical trials. At each stage, the learner must choose actions that not only maximize cumulative reward across the entire time horizon but further satisfy a linear baseline constraint that takes the form of a lower bound on the instantaneous reward. For this problem, we present two novel algorithms, stage-wise conservative linear Thompson Sampling (SCLTS) and stage-wise conservative linear UCB (SCLUCB), that respect the baseline constraints and enjoy probabilistic regret bounds of order O(\sqrt{T} \log^{3/2}T) and O(\sqrt{T} \log T), respectively. Notably, the proposed algorithms can be adjusted with only minor modifications to tackle different problem variations, such as constraints with bandit-feedback, or an unknown sequence of baseline actions. We discuss these and other improvements over the state-of-the-art. For instance, compared to existing solutions, we show that SCLTS plays the (non-optimal) baseline action at most O(\log{T}) times (compared to O(\sqrt{T})). Finally, we make connections to another studied form of safety constraints that takes the form of an upper bound on the instantaneous reward. While this incurs additional complexity to the learning process as the optimal action is not guaranteed to belong to the safe set at each round, we show that SCLUCB can properly adjust in this setting via a simple modification.
description: 28 pages, 5 figures
$\mathcal{L}_1$ Adaptive Control for Switching Reference Systems: Application to Flight Control
Creators: name: Snyder, Steven
name: Zhao, Pan
name: Hovakimyan, Naira
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents a framework for the design and analysis of an $\mathcal{L}_1$ adaptive controller with a switching reference system. The use of a switching reference system allows the desired behavior to be scheduled across the operating envelope, which is often required in aerospace applications. The analysis uses a switched reference system that assumes perfect knowledge of uncertainties and uses a corresponding non-adaptive controller. Provided that this switched reference system is stable, it is shown that the closed-loop system with unknown parameters and disturbances and the $\mathcal{L}_1$ adaptive controller can behave arbitrarily close to this reference system. Simulations of the short period dynamics of a transport class aircraft during the approach phase illustrate the theoretical results.
description: Published in IFAC-PapersOnLine
Hybrid Algorithm for Nonlinear Equilibrium, Variational Inequality and Fixed Point Problems
Creators: name: Ibiam, O. I. Agha
name: Madu, L. O.
name: Ofoedu, E. U.
name: Onyi, C. E.
name: Zegeye, H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47H05, 47H06 47H10 (Primary), 47J05 47J25 (Secondary)

description: In this paper, we introduce an iterative process which converges strongly to a common element of sets of solutions of finite family of generalized equilibrium problems, sets of fixed points of finite family of continuous relatively nonexpansive mappings and sets of zeros of finite family of $γ$-inverse strongly monotone mappings in Banach spaces. Our theorems improve and generalize several results which are announced recently. Our iteration process, method of proof and corollaries are of independent interest
description: 16 pages
The myth and meaning of morality in therapy
Creators: name: Cronin, Margaret-Anne
Publisher: name: University of British Columbia
Year: 2009

description: This study was conducted in order to investigate the manner in which female therapists describe a moral experience in therapy and to investigate what facilitates or hinders a moral experience in therapy. The study was set up to avoid the usual moral dilemmas, legalities or puritanical ponderings that have come to be associated with investigations of moral behaviour. Rather, a moral experience in therapy is defined as a relationship experience between a therapist and client which could be described as upright, good, wholesome and clear and one that involves care and concern. Eight female therapists who had been in practice for at least five years were asked to share two experiences that they had had with clients. The first experience was an experience that they would describe as clear, wholesome and caring, that is 'moral'. The second experience was one that would provide a contrast to the first experience: that is, one that was less clear, caring, wholesome and moral than the first. The interviews were examined using Tappan's hermeneutic model for interpreting lived moral experience. This model looks at the interrelationships among thinking feeling and action that accompany all experience. Where possible it attempts to separate these processes but, more importantly, it emphasizes the difficulty of separating these processes and the influences and interdependencies among them. The results of the study show that while all three processes enter into the therapist's moral presence, the emotional process is most influential in determining relationship outcome. The therapist's 'feelings' while in relationship with her client can, if intense enough, undermine her clearest 'thinking' about how to form a clear and caring relationship. I conclude by stating that it is a myth to believe that teaching ethics assures moral practice.
Digital Technologies and Channels to Competitive Advantage in SMEs
Creators: name: Kolisi, Liyema
name: CHABALALA, KOKETSO
name: Boyana, Sinoxolo
name: Thango (Y2-rated Researcher), Dr Bonginkosi
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 460299
subject: Artificial intelligence not elsewhere classified
classificationCode: 350601
subject: Consumer behaviour
classificationCode: 350304
subject: Business systems in context

description:  In recent years, digital transformation has become a pivotal factor for Small and Medium-sized Enterprises (SMEs), empowering them to adopt emerging technologies for competitive advantage. This systematic literature review examines 60 research papers published between 2014 and 2024, using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) framework to explore the impact of digital technologies such as artificial intelligence, cloud computing, blockchain, and the Internet of Things (IoT) on SME performance. The review focuses on key drivers and barriers, including operational efficiency, customer engagement, and market expansion. Methodologies employed in the analyzed studies include quantitative approaches (60%), such as surveys and structural equation modelling, qualitative methods (25%), including interviews and case studies, and mixed methods approaches (15%) that combine both. A geographic distribution analysis highlights contributions from various countries, revealing regional research gaps. The results show that digital technologies have significantly improved SME operations, but challenges like limited resources and strategic focus persist. Additionally, the dominance of quantitative methods indicates a potential bias, suggesting the need for more diverse methodological approaches to fully understand the transformative potential of digital technologies for SMEs.
The Importance of Balanced Data Sets: Analyzing a Vehicle Trajectory Prediction Model based on Neural Networks and Distributed Representations
Creators: name: Mirus, Florian
name: Stewart, Terrence C.
name: Conradt, Jorg
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Predicting future behavior of other traffic participants is an essential task that needs to be solved by automated vehicles and human drivers alike to achieve safe and situationaware driving. Modern approaches to vehicles trajectory prediction typically rely on data-driven models like neural networks, in particular LSTMs (Long Short-Term Memorys), achieving promising results. However, the question of optimal composition of the underlying training data has received less attention. In this paper, we expand on previous work on vehicle trajectory prediction based on neural network models employing distributed representations to encode automotive scenes in a semantic vector substrate. We analyze the influence of variations in the training data on the performance of our prediction models. Thereby, we show that the models employing our semantic vector representation outperform the numerical model when trained on an adequate data set and thereby, that the composition of training data in vehicle trajectory prediction is crucial for successful training. We conduct our analysis on challenging real-world driving data.
Weighted Variable Automata over Infinite Alphabets
Creators: name: Πίττου, Μαρία Εμμανουήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Άπειρα αλφάβητα
Αυτόματα μεταβλητών με βάρη
Ημιδακτύλιοι
Infinite alphabets
Weighted variable automata
Semirings

description: Στόχος της παρούσας διπλωματικής είναι η μελέτη ενός μοντέλου αυτομάτων με βάρη πάνω σε άπειρα αλφάβητα εισόδου και να διερευνηθεί η κλάση των συμπεριφορών τους. Συγκεκριμένα, εισάγουμε τα αυτόματα μεταβλητών με βάρη πάνω σε άπειρα αλφάβητα και αντιμεταθετικούς και idempotent ημιδακτυλίους. Αποδεικνύουμε ότι η κλάση των συμπεριφορών τους είναι κλειστή ως προς τις πράξεις της πρόσθεσης, και του βαθμωτού, Hadamard, Cauchy, και shuffle γινομένου, καθώς και ως προς τη πράξη του star. Επίσης, ορίζουμε τις ρητές σειρές πάνω σε άπειρα αλφάβητα και δείχνουμε ότι η κλάση τους ταυτίζεται με την κλάση των συμπεριφορών των αυτομάτων μας, δηλαδή ένα αποτέλεσμα τύπου Kleene-Schützenberger. Επιπροσθέτως, εισάγουμε τη μοναδιακή λογική δεύτερης τάξης, με βάρη, σε άπειρα αλφάβητα, και προσδιορίζουμε ένα φράγμα της, του οποίου οι προτάσεις ορίζουν ακριβώς την κλάση των συμπεριφορών των αυτομάτων μας. Τέλος, εφαρμόζουμε τα αποτελέσματα μας στα αυτόματα μεταβλητών με βάρη πάνω στον ημιδακτύλιο του Boole, οπότε λαμβάνουμε νέα αποτελέσματα καθώς και το θεώρημα του Kleene και του Büchi για τη κλάση των γλωσσών που αναγνωρίζονται από τα αυτόματα μεταβλητών.
description: The aim of the present Thesis is to introduce a model of weighted automata over infinite alphabets and investigate the class of their behaviors. In particular, we consider weighted variable automata over infinite alphabets and commutative and idempotent semirings. We prove that the class of their behaviors is closed under sum, and under scalar, Hadamard, Cauchy, and shuffle product, as well as star operation. We also consider rational series over infinite alphabets and we state a Kleene-Schützenberger theorem. Furthermore, we obtain an MSO logical characterization for the class of series accepted by weighted variable automata. Finally, an application of our results, using the Boolean semiring, derives new results as well as a Kleene’s and a Büchi’s theorem for the class of languages accepted by variable finite automata.
Οικονομία, Εκκλησία και Πολιτεία (1ος – 5ος αι.):
Creators: name: Χιωτέλλη, Νίκη Ελευθερίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Οικονομία
Πλούτος
Εκκλησία
Economy
Wealth
Church

description: Αντικείμενο αυτής της έρευνας αποτελεί η διαπίστωση τυχόν νομικού πλαισίου που ρύθμιζε τις οικονομικές σχέσεις κράτους και χριστιανών από την Καινή Διαθήκη ως το πρώιμο Βυζάντιο (1ος -5ος μ.Χ αι.), καθώς και η διερεύνηση της διαμόρφωσης των σχέσεων αυτών. Σημαντικός είναι επίσης ο προβληματισμός μου σχετικά και με τις μεταξύ τους αλληλεπιδράσεις. Στην εργασία μας αυτή, μεταξύ άλλων αναλύονται: οι οικονομικές αντιλήψεις και συναλλαγές των χριστιανών κατά τους χρόνους της Καινής Διαθήκης. Η σχέση της Εκκλησίας με τη Ρωμαϊκή πολιτεία κατά την περίοδο των διωγμών. Το θεσμικό πλαίσιο για τα οικονομικά των Χριστιανών, όπως απορρέουν από το διάταγμα της ανεξιθρησκίας του Γαλέριου, και στη συνέχεια από το διάταγμα των Μεδιολάνων. Οι θέσεις των Πατέρων για το χρήμα και τον πλούτο, καθώς και οι επιδράσεις τους στο κράτος και τον πολίτη. Η θέση της Εκκλησίας κατά την εποχή των διαδόχων του Μ. Κωνσταντίνου, και τέλος, η θέση της Εκκλησίας στο Βυζάντιο κατά τον τέταρτο και πέμπτο αιώνα. Αφού λοιπόν έχει προηγηθεί μια συνοπτική παρουσίαση των οικονομικών σχέσεων μεταξύ Εκκλησίας και Πολιτείας, αρχικά κατά τους χρόνους της Καινής Διαθήκης και στη συνέχεια της ρωμαϊκής κυριαρχίας, παρουσιάζεται ένα πρωταρχικό οικονομικό θεσμικό πλαίσιο και κατ΄ επέκταση οι πρακτικές του μέσα στο Βυζαντινό Κράτους, από την πρώτη οργάνωση της χριστιανικής κοινότητας, έως την Δ΄ Οικουμενική Σύνοδο (5οςαι. μ.Χ.)
description: The issue of this research is to reveal any legal framework regulating the financial relations between the state and the Christians from the times of the New Testament up to the early years of Byzantium (1st to 5th century AD.), and the investigation of the formation of these relationships. My concerning about the interactions between them is also important. In this paper, are analyzed: the economic and trade perceptions of Christians during the times of the New Testament. The Church's relationship with the Roman state during the persecutions. The institutional framework of Christians’ economics, according to the Decree of Tolerance of Galerius, and later according to the Edict of Milan. Fathers’ ideas about money and wealth, and their effects on the state and the citizen. The situation of the Church at the time of the successors of Constantine, and finally the establishment of the Church in the Byzantine State, during the fourth and fifth century. So initially, in this paper, a summary of the economic relations between Church and State is preceded, during the times of the New Testament and the Roman domination, then a prime economic institutional framework is presented and therefore its practices within the Byzantine State, from the first organization of the Christian community, up to the Fourth Ecumenical Council (5th century AD.)
ijsrp-p7046.pdfDigital Technologies and Channels to Competitive Advantage in SMEs
Creators: name: Kolisi, Liyema
name: CHABALALA, KOKETSO
name: Boyana, Sinoxolo
name: Thango (Y2-rated Researcher), Dr Bonginkosi
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 460299
subject: Artificial intelligence not elsewhere classified
classificationCode: 350601
subject: Consumer behaviour
classificationCode: 350304
subject: Business systems in context

description:  In recent years, digital transformation has become a pivotal factor for Small and Medium-sized Enterprises (SMEs), empowering them to adopt emerging technologies for competitive advantage. This systematic literature review examines 60 research papers published between 2014 and 2024, using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) framework to explore the impact of digital technologies such as artificial intelligence, cloud computing, blockchain, and the Internet of Things (IoT) on SME performance. The review focuses on key drivers and barriers, including operational efficiency, customer engagement, and market expansion. Methodologies employed in the analyzed studies include quantitative approaches (60%), such as surveys and structural equation modelling, qualitative methods (25%), including interviews and case studies, and mixed methods approaches (15%) that combine both. A geographic distribution analysis highlights contributions from various countries, revealing regional research gaps. The results show that digital technologies have significantly improved SME operations, but challenges like limited resources and strategic focus persist. Additionally, the dominance of quantitative methods indicates a potential bias, suggesting the need for more diverse methodological approaches to fully understand the transformative potential of digital technologies for SMEs.
Notions of equivalences of multivariate polynomial matrices:
Creators: name: Λαμπίρη, Ευαγγελία Διονυσίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Βάσεις Groebner
Πολυωνυμικοί πίνακες
Ισοδυναμίες
Groebner bases
Polynomial matrices
Equivalences

description: Στην παρούσα διπλωματική εργασία γίνεται μελέτη των βάσεων Groebner και του αλγόριθμου εύρεσης τους (Buchberger αλγόριθμος). Επίσης πραγματεύεται σχέσεις ισοδυναμίας και συγκεκριμένα ισοδυναμίες 1-D και 2-D πολυωνυμικών πινάκων. Η εργασία είναι χωρισμένη σε δύο μέρη.Το πρώτο μέρος της εργασίας, ασχολείται με τις βάσεις Groebner, καθώς και τον αλγόριθμο του Buchberger για την εύρεση αυτών. Επίσης, δίνεται ο τρόπος εύρεσης τους μέσα από το πρόγραμμα Mathematica.Το δεύτερο μέρος της εργασίας, περιλαμβάνει έννοιες των 1-D και 2-D πολυωνυμικών πινάκων και τα σημεία στα οποία αυτές διαφέρουν. Επίσης, γίνεται εκτενής ανάλυση της αντιστρέψιμης ισοδυναμίας (unimodular equivalence) που αφορά πολυωνιμικούς πίνακες ιδίων διαστάσεων και της γενικευμένης αντιστρέψιμης ισοδυναμίας (extended unimodular equivalence) που αφορά πολυωνυμικούς πίνακες διαφορετικών διαστάσεων. Τέλος, δίνονται οι zero coprime και factor coprime ισοδυναμίες και τα αναλλοίωτα στοιχεία αυτών.
description: In the present Thesis is studied the Groebner bases and their algorithm (Buchberger algorithm). Moreover, it concerns about equivalence relations and specifically equivalences of 1-D and 2-D polynomial matrices. This paper consists of two parts. The first part of this thesis deals with Groebner bases, as well as Buchberger algorithm for finding these. Furthermore, it is given the way to find them through the program of Mathematica. The second part of this thesis includes notions of 1-D and 2-D polynomial matrices and the points on which they differ. There is also an extensive analysis of the unimodular equivalence which is about polynomial matrices of the same dimension and of the extended unimodular equivalence that is about polynomial matrices of different dimensions. Lastly, given the zero coprime equivalence and factor coprime equivalence and the invariants of them.
MILLIY TARAQQIYOT STRATEGIYASI: O'ZBEKISTONDA KAMBAG'ALLIKNI QISQARTIRISH MASALALARI VA XALQARO TAJRIBALAR TAHLILI
Creators: name: Tashtanova, Dilafruz
Publisher: name: Academic Scientific Research
Year: 2024
Subjects: kambag'allik
milliy taraqqiyot
xalqaro tajribalar
iqtisodiy rivojlanish

description: Tadqiqot mavzusi va maqsadi: ushbu tadqiqotning asosiy mavzusi O‘zbekistonning milliy taraqqiyot strategiyasi doirasida kambag‘allikni qisqartirish masalalarini o‘rganish va xalqaro tajribalarni tahlil qilishdir. Tadqiqotning maqsadi – O‘zbekistonda kambag‘allik darajasini kamaytirish bo‘yicha samarali strategiyalarni ishlab chiqish hamda ularni xalqaro tajribalar bilan solishtirish orqali takomillashtirish imkoniyatlarini aniqlash. Tadqiqotda ko‘rib chiqilayotgan asosiy muammo – O‘zbekistonda kambag‘allik darajasining yuqoriligi va uni qisqartirishda mavjud milliy strategiyalarning samaradorligi. Shu bilan birga, mamlakatdagi kambag‘allikni kamaytirish yo‘llarini xalqaro tajribalar asosida qanday takomillashtirish mumkinligi asosiy savol sifatida ko‘tarilgan. Tadqiqotda sifatli va miqdoriy metodlar kombinatsiyasi qo‘llanilgan. Asosan, statistik ma’lumotlarni tahlil qilish, iqtisodiy ko‘rsatkichlarni solishtirish, hamda xalqaro mamlakatlarning kambag‘allikni kamaytirish strategiyalarini o‘rganish uchun komparativ tahlil metodlari ishlatilgan. Shuningdek, intervyu va ekspert fikrlarini yig‘ish orqali empirik ma’lumotlar to‘plangan. Praktik tavsiyalar sifatida, hukumatga kambag‘allikni qisqartirish bo‘yicha strategik rejalarni ishlab chiqishda xalqaro tajribalarni chuqurroq tahlil qilish, mahalliy sharoitlarga moslashtirish va samarali amalga oshirish mexanizmlarini yaratish tavsiya etiladi. Nazariy jihatdan esa, tadqiqot milliy va xalqaro taraqqiyot strategiyalarini integratsiyalash yo‘llarini ko‘rsatadi.
Ultradiscretization of solvable one-dimensional chaotic maps
Creators: name: Kajiwara, Kenji
name: Nobe, Atsushi
name: Tsuda, Teruhisa
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Dynamical Systems (math.DS)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider the ultradiscretization of a solvable one-dimensional chaotic map which arises from the duplication formula of the elliptic functions. It is shown that ultradiscrete limit of the map and its solution yield the tent map and its solution simultaneously. A geometric interpretation of the dynamics of the tent map is given in terms of the tropical Jacobian of a certain tropical curve. Generalization to the maps corresponding to the $m$-th multiplication formula of the elliptic functions is also discussed.
description: 11 pages
Electronic properties in itinerant ferromagnet SrRu$_{1-x}$Ti$_x$O$_3$
Creators: name: Gupta, Renu
name: Rawat, R.
name: Pramanik, A. K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Here, we study the electrical transport and specific heat in 4$d$ based ferromagnetic material SrRuO$_3$ and its Ti substituted SrRu$_{1-x}$Ti$_x$O$_3$ series ($x$ $\le$ 0.7). The SrRuO$_3$ is a metal and shows itinerant ferromagnetism with transition temperature $T_c$ $\sim$ 160 K. The nonmagnetic Ti$^{4+}$ (3$d^0$) substitution would not only weaken the active Ru-O-Ru channel but is also expected to tune the electronic density and electron correlation effect. A metal to insulator transition has been observed around $x$ $\sim$ 0.4. The nature of charge transport in paramagnetic-metallic state ($x$ $\leq$ 0.4) and in insulating state ($x$ $>$ 0.4) follows modified Mott's variable range hopping model. In ferromagnetic-metallic state, resistivity shows a $T^2$ dependence below $T_c$ which though modifies to $T^{3/2}$ dependence at low temperature. In Ti substituted samples, temperature range for $T^{3/2}$ dependence extends to higher temperature. Interestingly, this $T^{3/2}$ dependence dominates in whole ferromagnetic regime in presence of magnetic field. This evolution of electronic transport behavior can be explained within the framework of Fermi liquid theory and electron-magnon scattering mechanism. The negative magnetoresistance exhibits a hysteresis and a crossover between negative and positive value with magnetic field which is connected with magnetic behavior in series. The decreasing electronic coefficient of specific heat with $x$ supports the increasing insulating behavior in present series. We calculate a high Kadowaki-Woods ratio ($x$ $\leq$ 0.3) for SrRuO$_3$ which increases with substitution concentration. This signifies an increasing electronic correlation effect with substitution concentration.
description: 21 pages, 10 figures
A General Overview for Localizing Short Gamma-ray Bursts with a CubeSat Mega-Constellation
Creators: name: Inceoglu, Fadil
name: Marcano, Nestor J. Hernandez
name: Jacobsen, Rune H.
name: Karoff, Christoffer
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Gamma-Ray Burst Monitor (GBM) on the {\it Fermi Gamma-Ray Space Telescope}, for the first time, detected a short gamma ray burst (SGRB) signal that accompanies a gravitational wave signal GW170817 in 2017. The detection and localization of the gravitational wave and gamma-ray source led all other space- and ground-based observatories to measure its kilonova and afterglow across the electromagnetic spectrum, which started a new era in astronomy, the so-called multi-messenger astronomy. Therefore, localizations of short gamma-ray bursts, as counterparts of verified gravitational waves, is of crucial importance since this will allow observatories to measure the kilonovae and afterglows associated with these explosions. Our results show that, an automated network of observatories, such as the Stellar Observations Network Group (SONG), can be coupled with an interconnected multi-hop array of CubeSats for transients (IMPACT) to localize SGRBs. IMPACT is a mega-constellation of $\sim$80 CubeSats, each of which is equipped with gamma-ray detectors with ultra-high temporal resolution to conduct full sky surveys in an energy range of 50-300 keV and downlink the required data promptly for high accuracy localization of the detected SGRB to a ground station. Additionally, we analyze propagation and transmission delays from receipt of a SGRB signal to ground station offload to consider the effects of constellation design, link, and network parameters such as satellites per plane, data rate, and coding gain from erasure correcting codes among others. IMPACT will provide near-real-time localization of SGRBs with a total delay of $\sim$5 s, and will enable SONG telescopes to join the efforts to pursue multi-messenger astronomy and help decipher the underlying physics of these events.
Equilibrium models of strongly-magnetized neutron stars:
Creators: name: Παλαπανίδης, Κωνσταντίνος Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Αστροφυσική
Αστέρες νετρονίων
Υπεραγωγιμότητα
Astrophysics
Neutron stars
Superconductivity

description: We construct equilibrium configurations of strongly-magnetized, rotating neutron stars with mixed poloidal and toroidal components, using an iterative numerical method. The toroidal component contains only a small fraction of the total magnetic energy. The accuracy of the numerical solutions is evaluated using the virial theorem and by studying the convergence to high accuracy after a number of iterations. First, we consider a normal fluid interior, in the ideal magnetohydrodynamics approximation (and a vacuum exterior) and verify that our code reproduces published results in the literature with good accuracy. Next, we assume that the neutron star has two regions: the inner core, which is modelled as a two-component fluid consisting of type-II superconducting protons and superfluid neutrons, and the crust, a region composed of normal matter. In this case, we find significant differences compared to the case of a normal matter core and qualitatively confirm recently published results in the strong-field case. For magnetic field strengths typical of normal pulsars, we find that the very weak coupling of the Grad-Shafranov equation with the equation of hydrostatic equilibrium requires a significantly larger number of iterations, before the magnetic field configuration relaxes to a converged solution. In this respect, we improve over previously published results.
description: Δημιουργούμε καταστάσεις ισορροπίας ισχυρά μαγνητισμένων αστέρων νετρονίων με πολοειδείς και τοροειδείς συνιστώσες στο μαγνητικό πεδίο, χρησιμοποιώντας επαναληπτική αριθμητική μέθοδο. Η τοροειδής συνιστώσα του μαγνητικού πεδίου περιέχει μόνο ένα μικρό τμήμα της ολικής μαγνητικής ενέργειας. Η ακρίβεια των αριθμητικών λύσεων υπολογίζεται μέσω του θεωρήματος virial και μέσω υψηλής ακρίβειας σύγκλισης μετά από ορισμένες επαναλήψεις. Αρχικά θεωρούμε ένα κανονικό ρευστό στο εσωτερικό του αστέρα ακολουθώντας την προσέγγιση της ιδανικής μαγνητοϋδροδυναμικής (και κενό στο εξωτερικό) και επιβεβαιώνουμε πως ο κώδικας αναπαράγει δημοσιευμένα αποτελέσματα με καλή ακρίβεια. Στη συνέχεια, θεωρούμε αστέρα νετρονίων που χαρακτηρίζεται από δύο περιοχές: τον εσωτερικό πυρήνα που μοντελοποιείται ως ρευστό δύο συστατικών, το οποίο αποτελείται από τύπου-ΙΙ υπεραγώγιμα πρωτόνια και υπερρευστά νετρόνια, και τον στερεό φλοιό, μία περιοχή που αποτελείται από κανονική ύλη. Στην περίπτωση αυτή βρίσκουμε σημαντικές διαφορές σε σχέση με την περίπτωση που ο πυρήνας αποτελείται από κανονική ύλη και επιβεβαιώνουμε ποιοτικά πρόσφατα δημοσιευμένα αποτελέσματα στην περίπτωση του ισχυρού πεδίου. Για τιμές μαγνητικών πεδίων συνηθισμένων πάλσαρ βρίσκουμε πως η ασθενής σύζευξη της εξίσωσης Grad-Shafranov με την εξίσωση υδροστατικής ισορροπίας απαιτεί έναν σημαντικά μεγαλύτερο αριθμό επαναλήψεων μέχρι το μαγνητικό πεδίο να συγκλίνει στην λύση. Από αυτήν την άποψη, βελτιώνουμε τα ήδη δημοσιευμένα αποτελέσματα.
Generator Controller Tuning Considering Stochastic Load Variation Using Analysis of Variance and Response Surface Method
Creators: name: Ibarra, Frank A.
name: Turizo, Daniel
name: Orozco-Henao, César
name: Guerrero, Javier
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This article proposes a method for generator controller tuning in a power system affected by stochastic loads. The method uses the Analysis of Variance to detect the controllers with significant effect over the quality of the system response. Such quality is measured with an objective function defined as a weighted average of the Integral Absolute Error of each controller. The significant variables are then varied over a specified region in order to characterize the objective function through a regression model, which is then optimized. The method was applied to the system IEEE14 and the results were compared with benchmark parameters, showing better performance.
description: 5 pages, 6 figures, 2019 ISGT-Europe, Bucharest, Romania, 2019
Local spin density in two-dimensional electron gas with hexagonal boundary
Creators: name: Chen, Son-Hsien
name: Liu, Ming-Hao
name: Chang, Ching-Ray
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The intrinsic spin-Hall effect in hexagon-shaped samples is investigated. To take into account the spin-orbit couplings and to fit the hexagon edges, we derive the triangular version of the tight-binding model for the linear Rashba [Sov. Phys. Solid State 2, 1109 (1960)] and Dresselhaus [Phys. Rev. 100, 580 (1955)] [001] Hamiltonians, which allow direct application of the Landauer-Keldysh non-equilibrium Green function formalism to calculating the local spin density within the hexagonal sample. Focusing on the out-of-plane component of spin, we obtain the geometry-dependent spin-Hall accumulation patterns, which are sensitive to not only the sample size, the spin-orbit coupling strength, the bias strength, but also the lead configurations. Contrary to the rectangular samples, the accumulation pattern can be very different in our hexagonal samples. Our present work provides a fundamental description of the geometry effect on the intrinsic spin-Hall effect, taking the hexagon as the specific case. Moreover, broken spin-Hall symmetry due to the coexistence of the Rashba and Dresselhaus couplings is also discussed. Upon exchanging the two coupling strengths, the accumulation pattern is reversed, confirming the earlier predicted sign change in spin-Hall conductivity.
description: 7 pages, 4 figures
The impact of informational interviewing on an individual’s career development
Creators: name: Post, Angela Solveiga
Publisher: name: University of British Columbia
Year: 2009

description: Informational interviewing is a technique that individuals can use to access current labour market information from those employed in the occupational field of interest. This research explores the experience of individuals who conduct informational interviews. Ten participants who are within 40 credit hours of completing an Arts Degree were selected from a university college. Participants attended a participatory workshop on informational interviewing and were expected to conduct their own informational interviews between workshop sessions. A total of 23 informational interviews were conducted within a four week time period for an average of 2.3 interviews per participant. The critical incident technique was utilized in a post-workshop interview to assess participants' experience of interviewing. 198 incidents were elicited including 145 positive critical incidents, or facilitating factors, and 53 negative critical incidents, or hindering factors. Twelve categories emerged from the incidents. These included the following eight facilitating factor categories: 1. Information- interviewee's personal experience, 2. Information- occupation, 3. Information- providing options, 4. Encouragement and confirmation, 5. Interviewee's personality, 6. Interview process, 7. Assessing the 'fit', and 8. Providing contacts or post-interview assistance. The four hindering factor categories included: 1. Negative affect, 2. Interview structure, 3. Perceived destructive factors, and 4. Unanswered questions or discouraging information. Additional pre-post test data was gathered to assess knowledge gained in the workshop as well as perception of control regarding career aspirations.