cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Theoretical orbital period distributions of cataclysmic variables above the period gap: effects of circumbinary disks
Creators: name: Willems, B.
name: Taam, R.
name: Kolb, U.
name: Dubus, G.
name: Sandquist, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The population of non magnetic cataclysmic variables evolving under the influence of a circumbinary disk is investigated for systems above the upper edge of the period gap at orbital periods greater than 2.75hr. For a fractional mass input rate into the disk, corresponding to 3e-4 of the mass transfer rate, the model systems exhibit a bounce at orbital periods greater than 2.75hr. The simulations reveal that (1) some systems can exist as dwarf nova type systems throughout their lifetime, (2) dwarf nova type systems can evolve into nova-like systems as their mass transfer rate increases with increasing circumbinary disk mass, and (3) nova-like systems can evolve back into dwarf nova systems during their postbounce evolution to longer orbital periods. Among these subclasses, nova-like cataclysmic variables would be the best candidates to search for circumbinary disks at wavelengths greater than 10 micron. The theoretical orbital period distribution of our population synthesis model is in reasonable accord with the combined population of dwarf novae and nova-like systems above the period gap, suggesting the possibility that systems with unevolved donors need not detach and evolve below the period gap as in the disrupted magnetic braking model. The resulting population furthermore reveals the possible presence of systems with small mass ratios (a property of systems exhibiting superhump phenomena at long orbital periods) and a preference of O/Ne/Mg white dwarfs in dwarf nova systems in comparison to nova-like systems. The importance of observational bias in accounting for the differing populations is examined, and it is shown that an understanding of these effects is necessary in order to confront the theoretical distributions with the observed ones in a meaningful manner. (abridged)
description: accepted for publication in ApJ
Οι γνώμες των φοιτητών του ΠΤΔΕ Κρήτης για την οργάνωση της σχολικής πρακτικής
Creators: name: Κανάκης, Ιωάννης Ν.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: Krönung der Lehrerausbildung. Obwohl die Dauer und die Art und Weise ihrer Organisation in der griechischen Volksschullehrerausbildung vom Pädagogischen zum Pädagogischen Fachbereich bedeutend abweicht, das Ziel ist gleich. Nähmlich die Studenten in einen ersten Kontakt zur Schulpraxis zu bringen, und sie zu helfen, Unterricht systematisch be-obacten, analysieren, vorbereiten, halten und beurteilen können. Empirische Untersungen über die schulpraktischen Studien in den Pädagogischen Fachbereichen für Volksschullehrer sind in Griechenland kaum aufzufinden. Die Idee zur Erfassung der Erwartungen und Vorschlägen von Studenten des Pädagogischen Fachbereiches der Universität Kreta auf und für das Schulpraktikum war im Wintersemester 1987-88 geboren. Wir wollten die Schulpraktika von Anfang an analysieren und evaluieren, um Rückschlüsse zu ziehen auf: 1. die Organisation der Schulpraktika, 2. die Qualität der theoretischen Ausbildung in Beziehung zu den Schulpraktika, 3. die Hospitation von Unterricht und die Unterrichtsevaluation, 4. die Schwierigkeiten, die den Studenten bei der Durchführung vor. Unterricht im Wege stehen, 5. die alternativen Unterrichtsformen, welche die Studenten im Unterricht einsetzen, 6. die Schultätigkeiten, in denen die Studenten außer dem Unterricht teilnehmen, 7. den Unterricht in kleinen Landsschulen, 8. die Kompaktprakrika, 9. die informelle Spezialiesierung der Volksschullehrerstudenteri, 10. die Diskussionen über die Unterichtsstunden von Studenten, 11. die Betreuung der Studenten im Schulpraktikum. Wir wollten auch den Studenten Gelegenheit geben, ihre Meinungen für das Lehrerberuf zu äußern, und ihre Vorschläge für die Verbesserung der Schulpraktika zu machen. In dieser Studie werden die Meinungen und Vorschläge von Studenten des Pädagogischen Fachbereiches der Universität Kreta rar die Schulpraktika der akademischen Jahren 1988-89, 1991-92 und 1994-95, wie sie in den entsprechenden Berichten niedergeschrieben wurden, vergleichend analysiert und statistisch ausgewertet. Die Ergebnisse der Untersuchung trugen früher aber auch in letzter Zeit zur Reorganisation und Verbesserung der Schulpraktika bei.
description: Παιδαγωγική Επιθεώρηση, Vol. 24 (1996)
Application of a MHD hybrid solar wind model with latitudinal dependences to Ulysses data at minimum
Creators: name: Aibeo, A.
name: Lima, J.
name: Sauty, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In a previous work, Ulysses data was analyzed to build a complete axisymmetric MHD solution for the solar wind at minimum including rotation and the initial flaring of the solar wind in the low corona. This model has some problems in reproducing the values of magnetic field at 1 AU despite the correct values of the velocity. Here, we intend to extend the previous analysis to another type of solutions and to improve our modelling of the wind from the solar surface to 1 AU. We compare the previous results to those obtained with a fully helicoidal model and construct a hybrid model combining both previous solutions, keeping the flexibility of the parent models in the appropriate domain. From the solar surface to the Alfven, point, a three component solution for velocity and magnetic field is used, reproducing the complex wind geometry and the well-known flaring of the field lines observed in coronal holes. From the Alfven radius to 1 AU and further, the hybrid model keeps the latitudinal dependences as flexible as possible, in order to deal with the sharp variations near the equator and we use the helicoidal solution, turning the poloidal streamlines into radial ones. Despite the absence of the initial flaring, the helicoidal model and the first hybrid solution suffer from the same low values of the magnetic field at 1 AU. However, by adjusting the parameters with a second hybrid solution, we are able to reproduce both the velocity and magnetic profiles observed by Ulysses and a reasonable description of the low corona, provided that a certain amount of energy deposit exists along the flow. The present paper shows that analytical axisymmetric solutions can be constructed to reproduce the solar structure and dynamics from 1 solar radius up to 1 AU.
description: 12 pages, 16 figures
First Principle Noncollinear Transport Calculation and Interfacial Spin-flipping of Cu/Co Multilayers
Creators: name: Tang, Ling
name: Wang, Shuai
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this paper the first principle noncollinear transport calculation for Cu/Co(111) including interfacial spin-flipping was performed. We modeled spin-flipping at the interface by assuming a noncollinear magnetic structure with random magnetization orientation which satisfied Gaussian distribution along average magnetization direction. The relationship between spin-dependent conductance including interfacial spin-flipping and random magnetization orientation distribution width was obtained. For certain distribution width, our defined spin-flipping ratio coincides with the range of experimental spin-flipping probability $P=1-e^{-δ}$, where $δ=0.25\pm0.1$. The magnetoresistance in Co/Cu/Co spin valve system including interfacial spin-flipping has also been calculated.
description: 5 pages, 4 figures, accepted for publication in Modern Physics Letters B
Hodge and Teichmüller
Creators: name: Kahn, Jeremy
name: Wright, Alex
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geometric Topology (math.GT)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We consider the derivative $Dπ$ of the projection $π$ from a stratum of Abelian or quadratic differentials to Teichmüller space. A closed one-form $η$ determines a relative cohomology class $[η]_Σ$, which is a tangent vector to the stratum. We give an integral formula for the pairing of of $Dπ([η]_Σ)$ with a cotangent vector to Teichmüller space (a quadratic differential).
 We derive from this a comparison between Hodge and Teichmüller norms, which has been used in the work of Arana-Herrera on effective dynamics of mapping class groups, and which may clarify the relationship between dynamical and geometric hyperbolicity results in Teichmüller theory.
Μελέτη θερμικής αγωγιμότητας σύνθετων υλικών με υπολογιστικές μεθόδους
Creators: name: Σαχπαζίδης, Γεώργιος Αχιλλέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ενεργός θερμική αγωγιμότητα
Μέθοδος των πεπερασμένων στοιχείων
Υλικό μήτρας
Υλικό ενίσχυσης
Παράγοντας γεωμετρίας
Λόγος των όγκων φ
Effective thermal conductivity
Finite element method
Matrix material
Filler material
Geometry factor
Volume fraction φ

description: Για τον προσδιορισμό του ενεργού συντελεστή θερμικής αγωγιμότητας keff σύνθετων υλικών, έγινε υπολογιστική ανάλυση με βάση τη θεωρία των πεπερασμένων στοιχείων. Η διερεύνηση του προβλήματος έγινε για σύνθετα υλικά δύο φάσεων, αρχικά ως προς τη γεωμετρία και τον προσανατολισμό των ενδόθετων σωματιδίων και στη συνέχεια ως προς το λόγο φ του όγκου του υλικού ενίσχυσης προς το συνολικό όγκο του σύνθετου υλικού. Στη συνέχεια έγινε επικύρωση των υπολογιστικών δεδομένων, η οποία έδειξε εξαιρετική συμφωνία με τις πειραματικές τιμές για όλο το εύρος του λόγου των όγκων φ.
description: In order to estimate the effective thermal conductivity keff of composite materials, a computing analysis based on the finite element method has been conducted. The analysis has been made for two-phase composite materials, first regarding the geometry and orientation of the filler particles and afterward regarding the volume fraction φ of the filler material volume over the total volume of the composite material. Data validation showed exceptional agreement with experimental results for the whole range of volume fraction φ.
Self-dual maps II: links and symmetry
Creators: name: Montejano, Luis
name: Alfonsín, Jorge L. Ramírez
name: Rasskin, Ivan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geometric Topology (math.GT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In this paper, we investigate representations of links that are either centrally symmetric in $\mathbb{R}^3$ or antipodally symmetric in $\mathbb{S}^3$. By using the notions of antipodally self-dual and antipodally symmetric maps, introduced and studied by the authors, we are able to present sufficient combinatorial conditions for a link $L$ to admit such representations. The latter naturally arises sufficient conditions for $L$ to be amphichiral.
 We also introduce another (closely related) method yielding again to sufficient conditions for $L$ to be amphichiral. We finally prove that a link $L$, associated to a map $G$, is amphichiral if the self-dual pairing of $G$ is not one of 6 specific ones among the classification of the 24 self-dual pairing $Cor(G) \rhd Aut(G)$.
description: 36 pages
A Declarative Goal-oriented Framework for Smart Environments with LPaaS
Creators: name: Bisicchia, Giuseppe
name: Forti, Stefano
name: Brogi, Antonio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Artificial Intelligence (cs.AI)
subject: Logic in Computer Science (cs.LO)
subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Smart environments powered by the Internet of Things aim at improving our daily lives by automatically tuning ambient parameters (e.g. temperature, interior light) and by achieving energy savings through self-managing cyber-physical systems. Commercial solutions, however, only permit setting simple target goals on those parameters and do not consider mediating conflicting goals among different users and/or system administrators, and feature limited compatibility across different IoT verticals. In this article, we propose a declarative framework to represent smart environments, user-set goals and customisable mediation policies to reconcile contrasting goals encompassing multiple IoT systems. An open-source Prolog prototype of the framework is showcased over two lifelike motivating examples.
Phase field predictions of microscopic fracture and R-curve behaviour of fibre-reinforced composites
Creators: name: Tan, Wei
name: Martínez-Pañeda, Emilio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We present a computational framework to explore the effect of microstructure and constituent properties upon the fracture toughness of fibre-reinforced polymer composites. To capture microscopic matrix cracking and fibre-matrix debonding, the framework couples the phase field fracture method and a cohesive zone model in the context of the finite element method. Virtual single-notched three point bending tests are conducted. The actual microstructure of the composite is simulated by an embedded cell in the fracture process zone, while the remaining area is homogenised to be an anisotropic elastic solid. A detailed comparison of the predicted results with experimental observations reveals that it is possible to accurately capture the crack path, interface debonding and load versus displacement response. The sensitivity of the crack growth resistance curve (R-curve) to the matrix fracture toughness and the fibre-matrix interface properties is determined. The influence of porosity upon the R-curve of fibre-reinforced composites is also explored, revealing a stabler response with increasing void volume fraction. These results shed light into microscopic fracture mechanisms and set the basis for efficient design of high fracture toughness composites.
Performance of transmission strategis in multihop packet radio networks
Creators: name: Wong, Victor J. K.
Publisher: name: University of British Columbia
Year: 2009

description: The problem of data communication in a multihop packet radio network (PRN) with a number of mobiles or randomly distributed stationary nodes using a slotted ALOHA channel access scheme is addressed. A multihop PRN is an extension of a single-hop PRN; in the latter system, a node can communicate directly with any other nodes. A multihop PRN is necessary if a node cannot reach another node due to transmit power constraints. In such a case, the node requires repeaters to forward packets on to the destination. If a network has a large number of nodes, employing spatial frequency reuse to achieve better spectrum is one of the advantages of a multihop PRN over a single-hop PRN. In multihop PRNs, a transmission strategy involves designing a routing algorithm and determining the transmission probability for each node in the network. Routing is one of the major problems in a multihop PRN. In this thesis, three new routing schemes, MAD, ARR, and MTP, are proposed. The performances of five transmission strategies based on the MFR, NFP, MAD, ARR, and MTP routing schemes with capture and fading are studied and compared. Results show that the transmission strategies based on the ARR and MTP routing schemes perform better than the other three transmission strategies. All five transmission strategies perform worse in the presence of Rayleigh fading; this is in contrast to contention-limited single-hop systems in which Rayleigh fading generally does not result in a poorer performance. A multiple receiver antenna system for a multihop PRN is proposed in which the nodes make use of multiple receiver antennas so as to provide diversity reception. The performances of the five transmission strategies based on the MFR, NFP, MAD, ARR, and MTP routing schemes in a Rayleigh fading environment are investigated. Results show that the performances of all five transmission strategies can be substantially improved by employing multiple antennas. The performance improvements of the transmission strategies arising from the use of directional transmitter antennas are also examined. It is found that the performances of all five transmission strategies can be improved by reducing the beamwidth of the antennas.
Δίκτυα Εφοδιασμού Υψηλής Ευαισθησίας είτε Μικρής Ανοχής σε Σφάλματα.
Creators: name: Αρβανίτης, Νίκος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Θεωρία Δικτύων
Δίκτυο Εφοδιασμού
Φιλοσοφία JIT
Network Theory
Supply Network
JIT Philosophy

description: Σκοπός της παρούσης διπλωματικής εργασίας είναι η αναζήτηση των μαθηματικών εργαλείων για την αξιολόγηση ποιοτικών και ποσοτικών χαρακτηριστικών δικτύων εφοδιασμού υψηλής ευαισθησίας είτε μικρής ανοχής σε σφάλματα. Το πρώτο μέρος αφορά στην ωφέλεια μετάπτωσης μιας επιχείρησης παραγωγής αγαθών από τη συμβατική λειτουργία με αποθέματα στην JIT φιλοσοφία. Έπειτα, πώς ανακύπτουν προβλήματα σε ένα περιβάλλον που δεν προβλέπονται δικλείδες ασφαλείας και πώς αυτά αντιμετωπίζονται από τα logistics. Το δεύτερο μέρος πραγματεύεται την ανάπτυξη ενός επίγειου δικτύου διανομής σε πεδίο μάχης. Τρία μοντέλα παρουσιάζονται, αναλύονται και συγκρίνονται προς εξαγωγή χρήσιμων συμπερασμάτων. Η συλλογιστική στο κομμάτι των εφαρμογών βασίστηκε (και καθοδηγήθηκε ως ένα βαθμό) στο υπολογιστικό περιβάλλον της R, με την εκτέλεση προσομοιώσεων να δημιουργεί δεδομένα προς επεξεργασία και ανάλυση.
description: The goal of this thesis is the quest of the mathematical tools for the valuation of qualitive and quantitive characteristics of supply networks with high sensitivity either low tolerance to errors. The first part regards to the gains of the transition of a goods producting company from the conventional operation to JIT philosophy. Then, how problems emerging in an environment where no secure valves provided and how logistics encounter them. The second part deals with the deploy of a ground distribution network in a battlefield. Three models are presented, analyzed and compared in order to extract useful conclusions. The reasoning in the applications part is based (and conducted, to a point) in R programming environment, where the execution of simulations created data for processing and analysis.
TCAD Modeling of Cryogenic nMOSFET ON-State Current and Subthreshold Slope
Creators: name: Dhillon, Prabjot
name: Dao, Nguyen Cong
name: Dao, Nguyen Cong
name: Wong, Hiu Yung
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In this paper, through careful calibration, we demonstrate the possibility of using a single set of models and parameters to model the ON current and Sub-threshold Slope (SS) of an nMOSFET at 300K and 5K using Technology Computer-Aided Design (TCAD). The device used is a 0.35um technology nMOSFET with W/L=10um/10um. We show that it is possible to model the abnormal SS by using interface acceptor traps with a density less than 2e12cm-2. We also propose trap distribution profiles in the energy space that can be used to reproduce other observed SS from 4K to 300K. Although this work does not prove or disprove any possible origin of the abnormal SS, it shows that one cannot completely rule out the interfacial traps as the origin and it shows that interfacial traps can be used to model the abnormal SS before the origin is fully understood. We also show that Drain-Induced-Barrier-Lowering (DIBL) is much reduced at cryogenic temperature due to the abnormal slope and the device optimization strategy might need to be revised.
description: 4 pages, 8 figures, International Conference on Simulation of Semiconductor Processes and Devices 2021
Η συμβολή της πολιτισμικής-ιστορικής παραμέτρου στο χειρισμό γεωμετρικών προβλημάτων: μια εμπειρική έρευνα για τον τρόπο αντιμετώπισης προβλημάτων μέτρησης επιφανειών από μαθητές της Α' Λυκείου
Creators: name: Ζαχάρος, Κ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: The aim of this research is to investigate the truth of following Suppositions. Our first aim is to See if the cultural and historical dimention which is enclosed in the suggested «tools» used for facing problems that have to do with the area and contributes in amore effective way to facing them. Secondly, in what way to facing them. Finally the contribution of teching, especially when, this inclydes elements which have to do with the historical evolution of the concept under suppositions. Our first aim is to see if the cultural and historical dimention which is enclosed in the suggested «tools» used for facing problems that have to do with the area and contributes in amore effective way to facing them. Secondly, in what way to facing them. Finally the contribution of teching, especially when this inclydes elements which have to do with the historical evolution of the concept under investigation. Our sample consists of 62 students in the first year of Senior high School and our experimental plan compares the output of two different groups, the experimental group and the control group. The variables whose influence we are investigation, have only been introduced in the experimental group and the evaluation of their results whοws their positive influence.
description: Παιδαγωγική Επιθεώρηση, Vol. 24 (1996)
Mallomonas pseudocorymbosa Gusev, Martynenko & Shkurina 2023, sp. nov.
Creators: name: Gusev, Evgeniy
name: Martynenko, Nikita
name: Shkurina, Nataliya
name: Dien, Tran Duc
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Chromista
Ochrophyta
Chrysophyceae
Synurales
Mallomonadaceae
Mallomonas
Mallomonas pseudocorymbosa

description: Mallomonas pseudocorymbosa Gusev, Martynenko & Shkurina sp. nov. (Figure 2).
Diagnosis: Scales are oval, tripartite, 4.8–5.9 × 3.3–4.3 µm in size, with or without a dome. The dome is large, rounded, oval or asymmetrical. The V-rib is acute, slightly hooded and its arms continuous with the anterior submarginal ribs. Anterior submarginal ribs are well developed. The anterior flange is wide, especially on the domeless scales, with a row of base plate pores at each side. The posterior flange is wide, with numerous base plate pores distributed on the surface. The shield and posterior flange have a secondary siliceous layer forming circular or elongated oval meshes unevenly distributed on the surface often with areas without development of the secondary layer. Numerous pores are placed on the basal plate. The posterior upturned rim is narrow, with inner struts visible only on TEM images, encircles less than a half of the scale perimeter. Bristles are 13–25 μm long, curved and serrated at the distal half. Shorter bristles have a bifurcated tip with a long terminal spine, and longer bristles have a prolonged thread-like terminal part. Cysts unknown.
Holotype (here designated): Portion of a single gathering of cells on SEM stub No. CD8 deposited at the Herbarium, Papanin Institute for Biology of Inland Waters RAS, Borok (IBIW). Material from Ahn Hai Lake, Côn SƠn Island, Bà Rịa-Vũng Tàu Province, Vietnam. Figure 2C illustrates a representative scale from the holotype specimen.
Type Locality: Ahn Hai Lake, Côn SƠn Island, Bà Rịa-Vũng Tàu Province, Vietnam. Latitude / Longitude: 8° 40.645’ N 106° 35.867’ E. At the time of collection, the pH was 6.5, temperature 30 °C, and specific conductance 201 µS cm-1. Material was collected by E.S. Gusev and Nguyen-Ngoc Lam on 3 May 2015.
Etymology: The species name is derived from the fact that its scales resemble, and could be confused with, those of Mallomonas corymbosa.
Distribution: This species has been observed in 17 localities in 13 provinces of Vietnam (Table 1). Scales of this species were also observed in Bangladesh (Takahashi & Hayakawa 1979), China (Wei &Yuan 2001, 2013; Wei et al. 2014), Brazil (Franceschini & Couté 1991)and South Africa (Janse van Vuuren et al. 2022). Mallomonas pseudocorymbosa was found at wide ranges of environmental parameters: pH from 6.1 to 8.6, specific conductance from 62 to 2370 µS cm-1, chlorophyll a values from 5 to 76 µg l –1, and temperature 17–39 ºC (Table 1).
description: Published as part of Gusev, Evgeniy, Martynenko, Nikita, Shkurina, Nataliya & Dien, Tran Duc, 2023, Description of a new species of the genus Mallomonas from section Mallomonas (Synurales, Chrysophyceae) in the tropics, pp. 59-68 in Phytotaxa 618 (1) on page 62, DOI: 10.11646/phytotaxa.618.1.5, http://zenodo.org/record/8389917
Step-by-Step HHL Algorithm Walkthrough to Enhance the Understanding of Critical Quantum Computing Concepts
Creators: name: Morrell, Hector Jose
name: Zaman, Anika
name: Wong, Hiu Yung
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: After learning basic quantum computing concepts, it is desirable to reinforce the learning using an important and relatively complex algorithm through which the students can observe and appreciate how the qubits evolve and interact with each other. Harrow-Hassidim-Lloyd (HHL) quantum algorithm, which can solve Linear System Problems with exponential speed-up over the classical method and is the basic of many important quantum computing algorithms, is used to serve this purpose. The HHL algorithm is explained analytically followed by a 4-qubit numerical example in bra-ket notation. Matlab code corresponding to the numerical example is available for students to gain a deeper understanding of the HHL algorithm from a pure matrix point of view. A quantum circuit programmed using qiskit is also provided which can be used for real hardware execution in IBM quantum computers. After going through the material, students are expected to have a better appreciation of the concepts such as basis transformation, bra-ket and matrix representations, superposition, entanglement, controlled operations, measurement, Quantum Fourier Transformation, Quantum Phase Estimation, and quantum programming. To help readers review these basic concepts, brief explanations augmented by the HHL numerical examples in the main text are provided in the Appendix.
New Casimir Energy Calculations
Creators: name: Ahmedov, H.
name: Duru, I. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: New Casimir energy results for massless scalar field in some 3 -dimensional cavities are presented. We attempted to discuss the correlation between the sign and the magnitude of the energy and the shape of the cavities.
description: Latex. 3 pages
The Unique Tangent Cone Property for Weakly Holomorphic Maps into Projective Algebraic Varieties
Creators: name: Caniato, Riccardo
name: Rivière, Tristan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In the present paper, we establish the uniqueness of tangent maps for general weakly holomorphic and locally approximable maps from an arbitrary almost complex manifold into projective algebraic varieties. As a byproduct of the approach and the techniques developed we also obtain the unique tangent cone property for a special class of non-rectifiable positive pseudo-holomorphic cycles. This approach gives also a new proof of the main result by C. Bellettini on the uniqueness of tangent cones for positive integral $(p,p)$-cycles in arbitrary almost complex manifolds.
description: 52 pages
Stability of the multi-solitons of the modified Korteweg-de Vries equation
Creators: name: Coz, Stefan Le
name: Wang, Zhong
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We establish the nonlinear stability of $N$-soliton solutions of the modified Korteweg-de Vries (mKdV) equation. The $N$-soliton solutions are global solutions of mKdV behaving at (positive and negative) time infinity as sums of $1$-solitons with speeds $0
Comparative analysis for masonry interlocking skewed arches
Creators: name: Mousavian, Elham
name: Bagi, Katalin
name: Casapulla, Claudia
Publisher: name: Zenodo
Year: 2021

description: The main objective of this work is to study the structural behaviour of interlocking skewed arch using the static problem based on the lower bound limit analysis; and discrete element analysis. The main novel contributions of the paper will be: - studying two helicoidal and logarithmic bond patterns - Investigating different numbers and orientations for the joints - Modelling interlocking joints in the local u or v directions of the shell.
Bootstrap for neural model selection
Creators: name: Kallel, Riadh
name: Cottrell, Marie
name: Vigneron, Vincent
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Bootstrap techniques (also called resampling computation techniques) have introduced new advances in modeling and model evaluation. Using resampling methods to construct a series of new samples which are based on the original data set, allows to estimate the stability of the parameters. Properties such as convergence and asymptotic normality can be checked for any particular observed data set. In most cases, the statistics computed on the generated data sets give a good idea of the confidence regions of the estimates. In this paper, we debate on the contribution of such methods for model selection, in the case of feedforward neural networks. The method is described and compared with the leave-one-out resampling method. The effectiveness of the bootstrap method, versus the leave-one-out methode, is checked through a number of examples.
description: A la suite de la conf\'{e}rence ESANN 2000
Ανάλυση Δικτύων Εφοδιασμού
Creators: name: Καραγιάννης, Αθανάσιος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Εφοδιαστική Αλυσίδα
Δίκτυο Εφοδιασμού
Θεωρία Δικτύων
Supply Chain
Supply Network
Network Theory

description: Σκοπός της παρούσης διπλωματικής εργασίας είναι η ανάλυση και η κατανόηση της διαχείριση της εφοδιαστικής αλυσίδας, εκμεταλλευόμενοι τα μαθηματικά εργαλεία που μας προσφέρει η θεωρία δικτύων, θεωρώντας την εφοδιαστική αλυσίδα ως δίκτυο. Στο πρώτο μέρος (Κεφ.1ο, Κεφ.2ο ) της εργασίας ορίζεται η έννοια της εφοδιαστικής αλυσίδας και γίνεται η απαραίτητη συσχέτιση με τη θεωρία δικτύων. Στο δεύτερο μέρος (Κεφ.3ο, Κεφ.4ο ) πραγματοποιείται η ανάλυση μίας εφοδιαστικής αλυσίδας ως δίκτυο, με τη βοήθεια ενός πραγματικού δικτύου. Επιλεγμένοι δείκτες υπολογίζονται (κόστος λειτουργίας, degree centrality, betweenness centrality, closeness centrality, eigenvector centrality, degree centralization, betweenness centralization, closeness centralization, εντροπία, αμοιβαία πληροφορία, vulnerability function, central point dominance) οι οποίοι σχετίζονται με τη λειτουργία του δικτύου. Βασιζόμενοι σε αυτήν την ανάλυση, στο Κεφάλαιο 4 παρουσιάζονται τέσσερις διαφορετικές τροποποιήσεις του αρχικού δικτύου ως «θεραπείες» και γίνεται υπολογισμός των προαναφερθέντων δεικτών για κάθε μία ξεχωριστά. Η αξιολόγηση των αποτελεσμάτων γίνεται στο Κεφάλαιο 5. Τα συμπεράσματα που προκύπτουν αναλύονται και παρουσιάζονται σε ένα συγκεντρωτικό πίνακα, καθιστώντας εφικτή τη σύγκριση μεταξύ των διαφορετικών προτεινόμενων θεραπειών και διευκολύνοντας την επιλογή της κατάλληλης «θεραπείας» ανάλογα με τις προτεραιότητες που υπάρχουν. Οι απαιτούμενοι υπολογισμοί πραγματοποιήθηκαν στο υπολογιστικό και προγραμματιστικό περιβάλλον της R.
description: The aim of the thesis is the analysis and the understanding of the management problems of the supply chain, using the mathematical tools of network theory, considering the supply chain as network. During the first part of the thesis (Chapter 1, Chapter 2) the concept of the supply chain is defined, with the relevant procedures and the links with network theory. The second part of the thesis (Chapter 3, Chapter 4) addresses the analyses of the supply chain, as a network using a real supply network. Specific selected indices have been calculated (operating cost, degree centrality, betweenness centrality, closeness centrality, eigenvector centrality, degree centralization, betweenness centralization, closeness centralization, entropy, mutual information, vulnerability function, central point dominance) related to the network’s function. Based on this analysis in chapter 4, we present four different modifications of the original network as “therapies” and we evaluate them in terms of the indices. The evaluation of the results is discussed in the last Chapter 5. The conclusions are summarized in a compilation table, facilitating the understanding of the comparison between the different therapies and enabling the selection of the proper cure according to the priorities. The calculations were performed using the programming-computing environment of R.
To Charge or to Sell? EV Pack Useful Life Estimation via LSTMs, CNNs, and Autoencoders
Creators: name: Bosello, Michael
name: Falcomer, Carlo
name: Rossi, Claudio
name: Pau, Giovanni
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Electric vehicles (EVs) are spreading fast as they promise to provide better performance and comfort, but above all, to help face climate change. Despite their success, their cost is still a challenge. Lithium-ion batteries are one of the most expensive EV components, and have become the standard for energy storage in various applications. Precisely estimating the remaining useful life (RUL) of battery packs can encourage their reuse and thus help to reduce the cost of EVs and improve sustainability. A correct RUL estimation can be used to quantify the residual market value of the battery pack. The customer can then decide to sell the battery when it still has a value, i.e., before it exceeds the end of life of the target application, so it can still be reused in a second domain without compromising safety and reliability. This paper proposes and compares two deep learning approaches to estimate the RUL of Li-ion batteries: LSTM and autoencoders vs. CNN and autoencoders. The autoencoders are used to extract useful features, while the subsequent network is then used to estimate the RUL. Compared to what has been proposed so far in the literature, we employ measures to ensure the method's applicability in the actual deployed application. Such measures include (1) avoiding using non-measurable variables as input, (2) employing appropriate datasets with wide variability and different conditions, and (3) predicting the remaining ampere-hours instead of the number of cycles. The results show that the proposed methods can generalize on datasets consisting of numerous batteries with high variance.
Το επίπεδο εξέλιξης του ενεργητικού λεξιλογίου των ελληνοπαίδων ηλικίας 4:8-6:5 ετών
Creators: name: Ζάχαρης, Δημήτριος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: Die vorliegende Arbeit stellt einen Versuch dar, den aktiven Wortschatz der griechischen Vorschulkindern zu erfassen. Als psychometrisches Instrument wurde der Wortschatztest von Kiese / Kozielski (1972) angewandt. Die Ergebnisse der Anwendung des tests zeigen, dass eine grosse Anzahl von Kindern, unter der potentiellen Leistungen ihrer Altersgruppe liegen. Diese Tatsache sollte uns motivieren, weitere Forschungen auf diesem Gebiet zu organisieren und eventuell Forderungsprogramme für sprachlich benachteiligte Kinder zu erstellen. Ausserdem sollten wir Normtabellen für Knaben und Madchen und Normtabellen für Kinder aus allen sozialen Schichten Konstruieren. Diese Arbeit soll uns weiterhin beschäftigen.
description: Παιδαγωγική Επιθεώρηση, Vol. 24 (1996)
Spacetime Instanton Corrections in 4D String Vacua - The Seesaw Mechanism for D-Brane Models
Creators: name: Blumenhagen, Ralph
name: Cvetic, Mirjam
name: Weigand, Timo
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We systematically investigate instanton corrections from wrapped Euclidean D-branes to the matter field superpotential of various classes of N=1 supersymmetric D-brane models in four dimensions. Both gauge invariance and the counting of fermionic zero modes provide strong constraints on the allowed non-perturbative superpotential couplings. We outline how the complete instanton computation boils down to the computation of open string disc diagrams for boundary changing operators multiplied by a one-loop vacuum diagram. For concreteness we focus on E2-instanton effects in Type IIA vacua with intersecting D6-branes, however the same structure emerges for Type IIB and heterotic vacua. The instantons wrapping rigid cycles can potentially destabilise the vacuum or generate perturbatively absent matter couplings such as proton decay operators, mu-parameter or right-handed neutrino Majorana mass terms. The latter allow the realization of the seesaw mechanism for MSSM-like intersecting D-brane models.
description: 40 pages, 3 tables, 7 figures; v2: typos corrected, references added; v3: minor sign adjustments, some comments added; v4: published version
Partial Order in Chaos: Consensus on Feature Attributions in the Rashomon Set
Creators: name: Laberge, Gabriel
name: Pequignot, Yann
name: Mathieu, Alexandre
name: Khomh, Foutse
name: Marchand, Mario
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Post-hoc global/local feature attribution methods are progressively being employed to understand the decisions of complex machine learning models. Yet, because of limited amounts of data, it is possible to obtain a diversity of models with good empirical performance but that provide very different explanations for the same prediction, making it hard to derive insight from them. In this work, instead of aiming at reducing the under-specification of model explanations, we fully embrace it and extract logical statements about feature attributions that are consistent across all models with good empirical performance (i.e. all models in the Rashomon Set). We show that partial orders of local/global feature importance arise from this methodology enabling more nuanced interpretations by allowing pairs of features to be incomparable when there is no consensus on their relative importance. We prove that every relation among features present in these partial orders also holds in the rankings provided by existing approaches. Finally, we present three use cases employing hypothesis spaces with tractable Rashomon Sets (Additive models, Kernel Ridge, and Random Forests) and show that partial orders allow one to extract consistent local and global interpretations of models despite their under-specification.
Markovian Monte Carlo solutions of the NLO QCD evolution equations
Creators: name: Golec-Biernat, K.
name: Jadach, S.
name: Placzek, W.
name: Skrzypek, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present precision Monte Carlo calculations solving the QCD evolution equations up to the next-to-leading-order (NLO) level. They employ forward Markovian Monte Carlo (FMC) algorithms, which provide the rigorous solutions of the QCD evolution equations. Appropriate Monte Carlo algorithms are described in detail. They are implemented in the form of the Monte Carlo program EvolFMC, which features the NLO kernels for the QCD evolution. The presented numerical results agree with those from independent, non-MC, programs (QCDNum16, APCheb33) at the level of 0.1%. In this way we have demonstrated the feasibility of the precision MC calculations for the QCD evolution and provided very useful numerical tests (benchmarks) for other, non-Markovian, MC algorithms developed recently.
description: 42 pages, 4 eps figures
Η διδασκαλία των αγγλικών για ειδικούς σκοπούς: μια ερευνητική προσέγγιση του προβλήματος στα πανειστήμια Αροστοτέλειο, Tilburg (Ολλανδία), Copenhagen (Δανία)
Creators: name: Δεληγιάννη-Γεωργάκα, Α.
name: Τσοτσόλη, Κ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: The present paper attempts to examine the factors which constitute English Language Teaching (ELT), particularly English for Specific Purposes (ESP) at Aristotle University of Thessaloniki, Tilburg University of Holland and Copenhagen University - Copenhagen Business School of Denmark, through a questionnaire. Due to the limited number of the sample the questionnaire has not been submitted to statistic evaluation. This research is therefore of limited scope and does not aim to reach any general conclusions concerning ELT at Universities. However, from recording the results of the questionnaire, it would appear that ESP at Tilburg and Copenhagen Universities is more systematic and effective than at Aristotle University of Thessaloniki. The above finding may mean that certain modifications regarding the contact and methods of this subject are required at Aristotle University of Thessaloniki and probably at other universities of Greece as well. The implementation of these modifications presupposes both the additional and in-service training of teaching staff. It was not considered to be useful to include statistic evaluation of the questionnaire results because of the limited number of questionnaires. In addition, examining the statistic significance of the results at this stage has not been of great interest, as this research constitutes a pilot study. Consequently, attempting to generalize from the findings might be considered as non-scientific.
description: Παιδαγωγική Επιθεώρηση, Vol. 24 (1996)
Tachyon Mimetic Inflation as an Instabilities-Free Model
Creators: name: Rashidi, Narges
name: Nozari, Kourosh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the mimetic tachyon model in the Lagrange multiplier approach. We study both the linear and non-linear perturbations and find the perturbation and non-gaussianity parameters in this setup. By adopting two types of the scale factor as the power-law ($a=a_{0}\,t^{n}$) and intermediate ($a=a_{0}\exp(bt^β)$) scale factors, we perform a numerical analysis on the model which is based on Planck2018 TT, TE, EE+lowE+lensing +BAO +BK14 and Planck2018 TTT, EEE, TTE and EET data sets. We show that the mimetic tachyon model with both the power-law and intermediate scale factors, in some ranges of its parameter space is instabilities-free and observationally viable. The power-law mimetic tachyon model with $26.3
description: 14 pages, 15 figures, 6 tables
A new representation for non--local operators and path integrals
Creators: name: Amore, Paolo
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We derive an alternative representation for the relativistic non--local kinetic energy operator and we apply it to solve the relativistic Salpeter equation using the variational sinc collocation method. Our representation is analytical and does not depend on an expansion in terms of local operators. We have used the relativistic harmonic oscillator problem to test our formula and we have found that arbitrarily precise results are obtained, simply increasing the number of grid points. More difficult problems have also been considered, observing in all cases the convergence of the numerical results. Using these results we have also derived a new representation for the quantum mechanical Green's function and for the corresponding path integral. We have tested this representation for a free particle in a box, recovering the exact result after taking the proper limits, and we have also found that the application of the Feynman--Kac formula to our Green's function yields the correct ground state energy. Our path integral representation allows to treat hamiltonians containing non--local operators and it could provide to the community a new tool to deal with such class of problems.
description: 9 pages ; 1 figure ; refs added ; title modified
Dimension Reduction with Prior Information for Knowledge Discovery
Creators: name: Bui, Anh Tuan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: This paper addresses the problem of mapping high-dimensional data to a low-dimensional space, in the presence of other known features. This problem is ubiquitous in science and engineering as there are often controllable/measurable features in most applications. To solve this problem, this paper proposes a broad class of methods, which is referred to as conditional multidimensional scaling (MDS). An algorithm for optimizing the objective function of conditional MDS is also developed. The convergence of this algorithm is proven under mild assumptions. Conditional MDS is illustrated with kinship terms, facial expressions, textile fabrics, car-brand perception, and cylinder machining examples. These examples demonstrate the advantages of conditional MDS over conventional dimension reduction in improving the estimation quality of the reduced-dimension space and simplifying visualization and knowledge discovery tasks. Computer codes for this work are available in the open-source cml R package.
description: Article accepted for publication in IEEE Transactions on Pattern Analysis and Machine Intelligence, 12 pages, 8 figures
Search for flares and associated CMEs on late-type main-sequence stars in optical SDSS spectra
Creators: name: Koller, Florian
name: Leitzinger, Martin
name: Temmer, Manuela
name: Odert, Petra
name: Beck, Paul G.
name: Veronig, Astrid
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This work aims to detect and classify stellar flares and potential stellar coronal mass ejection (CME) signatures in optical spectra provided by the Sloan Digital Sky Survey (SDSS) data release 14. The sample is constrained to all F, G, K, and M main-sequence type stars, resulting in more than 630,000 stars. This work makes use of the individual spectral exposures provided by the SDSS. An automatic flare search was performed by detecting significant amplitude changes in the $Hα$ and $Hβ$ spectral lines after a Gaussian profile was fit to the line core. CMEs were searched for by identifying asymmetries in the Balmer lines caused by the Doppler effect of plasma motions in the line of sight. We identified 281 flares on late-type stars (spectral types K3 to M9). We identified six possible CME candidates showing excess flux in Balmer line wings. Flare energies in $Hα$ were calculated and masses of the CME candidates were estimated. The derived $Hα$ flare energies range from $3 \times 10^{28} - 2 \times 10^{33}$ erg. The $Hα$ flare energy increases with earlier types, while the fraction of flaring times increases with later types. Mass estimates for the CME candidates are in the range of $6 \times 10^{16} - 6 \times 10^{18}$ g, and the highest projected velocities are $\sim300 - 700\:$ km/s. The low detection rate of CMEs we obtained agrees with previous studies, suggesting that for late-type main-sequence stars the CME occurrence rate that can be detected with optical spectroscopy is low.
description: Contains 22 pages and 21 figures. Properties of the flaring stars and the derived parameters of the flares are available at CDS