cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fermi-Bose mixture across a Feshbach resonance
Creators: name: Salasnich, Luca
name: Toigo, Flavio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a dilute mixture of degenerate bosons and fermions across a Feshbach resonance of the Fermi-Fermi scattering length $a_F$. This scattering length is renormalized by the boson-induced interaction between fermions and its value is crucial to determine the phase diagram of the system. For the mixture in a box and a positive Bose-Fermi scattering length, we show that there are three possibilities: a single uniform mixed phase, a purely fermionic phase coexisting with a mixed phase, and a purely fermionic phase coexisting with a purely bosonic one. As $1/a_F$ is increased from a negative value to the Feshbach resonance ($1/a_F=0$) the region of pure separation increases and the other two regions are strongly reduced. Above the Feshbach resonance ($1/a_F>0$), pairs of Fermi atoms become Bose-condensed molecules. We find that these molecules are fully spatially separated from the bosonic atoms when $1/a_F$ exceedes a critical value. For a negative Bose-Fermi scattering length we deduce the condition for collapse, which coincides with the onset of dynamical instability of the fully mixed phase. We consider also the mixture in a harmonic trap and determine the conditions for partial demixing, full demixing and collapse. The experimental implications of our results are investigated by analyzing mixtures of $^6$Li--$^{23}$Na and $^{40}$K--$^{87}$Rb atoms.
description: 9 pages, 5 figures, to be published in Phys. Rev. A
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Moringen
Creators: name: Evans, Richard
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Moringen was a Norwegian brig carrying cut timber from Norway to Aberdyfi in June 1897. It tried to enter the estuary in heavy seas and got carried onto the sand bar where it was grounded and smashed by the waves. All the crew were rescued by the Aberdyfi lifeboat and given food and shelter in the village, the lifeboat crew were given a dinner to thank them.
The Local Universe as Seen in Far-Infrared and in Far-Ultraviolet: A Global Point of View on the Local Recent Star Formation
Creators: name: Buat, V.
name: Takeuchi, T. T.
name: Iglesias-Paramo, J.
name: Xu, C. K.
name: Burgarella, D.
name: Boselli, A.
name: Barlow, T.
name: Bianchi, L.
name: Donas, J.
name: Forster, K.
name: Friedman, P. G.
name: Heckman, T. M.
name: Lee, Y. -W.
name: Madore, B. F.
name: Martin, D. C.
name: Milliard, B.
name: Morissey, P.
name: Neff, S.
name: Rich, M.
name: Schiminovich, D.
name: Seibert, M.
name: Small, T.
name: Szalay, A. S.
name: Welsh, B.
name: Wyder, T.
name: Yi, S. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We select far-infrared (FIR-60 microns) and far-ultraviolet (FUV-1530 A) samples of nearby galaxies in order to discuss the biases encountered by monochromatic surveys (FIR or FUV). Very different volumes are sampled by each selection and much care is taken to apply volume corrections to all the analyses. The distributions of the bolometric luminosity of young stars are compared for both samples: they are found to be consistent with each other for galaxies of intermediate luminosities but some differences are found for high (>5 10^{10} L_sun) luminosities. The shallowness of the IRAS survey prevents us from securing comparison at low luminosities (<2 10^9 L_sun). The ratio of the total infrared (TIR) luminosity to the FUV luminosity is found to increase with the bolometric luminosity in a similar way for both samples up to 5 10^{10} L_sun. Brighter galaxies are found to have a different behavior according to their selection: the L_TIR/L_FUV ratio of the FUV-selected galaxies brighter than 5 10^{10} L_sun reaches a plateau whereas L_TIR/L_FUV continues to increase with the luminosity of bright galaxies selected in FIR. The volume-averaged specific star formation rate (SFR per unit galaxy stellar mass, SSFR) is found to decrease toward massive galaxies within each selection. The SSFR is found to be larger than that measured for optical and NIR-selected sample over the whole mass range for the FIR selection, and for masses larger than 10^{10} M_sun for the FUV selection. Luminous and massive galaxies selected in FIR appear as active as galaxies with similar characteristics detected at z ~ 0.7.
description: 32 pages, 9 figures, to be published in the Astrophysical Journal Supplement series dedicated to GALEX results
Going beyond Free Viewpoint: Creating Animatable Volumetric Video of Human Performances
Creators: name: Hilsmann, Anna
name: Fechteler, Philipp
name: Morgenstern, Wieland
name: Paier, Wolfgang
name: Feldmann, Ingo
name: Schreer, Oliver
name: Eisert, Peter
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In this paper, we present an end-to-end pipeline for the creation of high-quality animatable volumetric video content of human performances. Going beyond the application of free-viewpoint volumetric video, we allow re-animation and alteration of an actor's performance through (i) the enrichment of the captured data with semantics and animation properties and (ii) applying hybrid geometry- and video-based animation methods that allow a direct animation of the high-quality data itself instead of creating an animatable model that resembles the captured data. Semantic enrichment and geometric animation ability are achieved by establishing temporal consistency in the 3D data, followed by an automatic rigging of each frame using a parametric shape-adaptive full human body model. Our hybrid geometry- and video-based animation approaches combine the flexibility of classical CG animation with the realism of real captured data. For pose editing, we exploit the captured data as much as possible and kinematically deform the captured frames to fit a desired pose. Further, we treat the face differently from the body in a hybrid geometry- and video-based animation approach where coarse movements and poses are modeled in the geometry only, while very fine and subtle details in the face, often lacking in purely geometric methods, are captured in video-based textures. These are processed to be interactively combined to form new facial expressions. On top of that, we learn the appearance of regions that are challenging to synthesize, such as the teeth or the eyes, and fill in missing regions realistically in an autoencoder-based approach. This paper covers the full pipeline from capturing and producing high-quality video content, over the enrichment with semantics and deformation properties for re-animation and processing of the data for the final hybrid animation.
Inverse spectral problems for Dirac operators with summable potentials
Creators: name: Albeverio, S.
name: Hryniv, R.
name: Mykytyuk, Ya.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: Primary 34A55, Secondary 34B30, 47E05

description: The spectral properties of Dirac operators on $(0,1)$ with potentials that belong entrywise to $L_p(0,1)$, for some $p\in[1,\infty)$, are studied. The algorithm of reconstruction of the potential from two spectra or from one spectrum and the corresponding norming constants is established, and a complete solution of the inverse spectral problem is provided.
description: 25 pages
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the Grounding of: Mouse (Schooner)
Creators: name: Davies, Gareth J.S.
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Mouse was an iron cargo schooner which sailed predominately between U.K. ports on the Irish Sea and Ireland. Cargos carried included slates, coal, stones and other general cargos. On Oct 07 th 1896, the Mouse was anchored in a critical position at Abersoch and was grounding at half tide. The crew were rescued by the Penrhyndu Lifeboat. This was the second time in a month the Mouse crew had been rescued. On Sep 17th the crew had been rescued by the Pwllheli Lifeboat during a storm.
Completeness: When Enough is Enough
Creators: name: Diener, Hannes
name: Hendtlass, Matthew
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2019

description: We investigate the notion of a complete enough metric space that, while classically vacuous, in a constructive setting allows for the generalisation of many theorems to a much wider class of spaces. In doing so, this notion also brings the known body of constructive results significantly closer to that of classical mathematics. Most prominently, we generalise the Kreisel-Lacome-Shoenfield Theorem/Tseytin's Theorem on the continuity of functions in recursive mathematics.
description: DOCUMENTA MATHEMATICA, Vol 24 (2019), p. 899-914
Η δυναμική του κλάδου τροφίμων σε περίοδο οικονομικής κρίσης
Creators: name: Ιορδανίδης, Νικόλαος Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Δυναμική
Βιομηχανία τροφίμων
Οικονομική κρίση
Dynamic
Food Industry
Economic crisis

description: Η παρούσα διπλωματική εργασία μελετά την δυναμική του κλάδου τροφίμων σε περίοδο οικονομικής κρίσης. Βασικοί στόχοι της εργασίας είναι η ανάλυση του κλάδου τροφίμων και ποτών και η διερεύνηση της στάσης των καταναλωτών σε σχέση με τις καταναλωτικές τους συνήθειες, κατά την περίοδο της οικονομικής κρίσης. Αρχικά, παρουσιάζεται και αναλύεται ο κλάδος τροφίμων και ποτών μέσω χρηματοοικονομικών αριθμοδεικτών του κλάδου και επίσης πραγματοποιείται η ανάλυση των λογιστικών καταστάσεων και ο υπολογισμός ορισμένων βασικών αριθμοδεικτών ενός αντιπροσωπευτικού δείγματος επιχειρήσεων. Για τις ανάγκες της μελέτης έχουν επιλεγεί τρεις βιομηχανίες τροφίμων από την περιφέρεια της Μακεδονίας. Συγκεκριμένα επιλέχθηκαν οι επιχειρήσεις Κρι-Κρι Βιομηχανία Γάλακτος Α.Β.Ε.Ε., Κυλινδρόμυλοι Χαλκιδικής Α.Ε. και Ελληνική Ζύμη (Μιχαήλ Αραμπατζής Α.Β.Ε.Ε.). Στη συνέχεια, η διερεύνηση της στάσης των καταναλωτών σε σχέση με τις καταναλωτικές τους συνήθειες, κατά την περίοδο της οικονομικής κρίσης πραγματοποιείται με τη χρήση ερωτηματολογίου. Η έρευνα διενεργήθηκε στο πολεοδομικό συγκρότημα Θεσσαλονίκης και το δείγμα αποτελείται από 400 καταναλωτές. Η στατιστική ανάλυση των δεδομένων του ερωτηματολογίου έγινε με το στατιστικό πακέτο SPSS έκδοση 20 (Statistical Package for Social Sciences), όπου πραγματοποιήθηκε περιγραφική ανάλυση των δεδομένων του ερωτηματολογίου και μετέπειτα διενεργήθηκε στατιστικός έλεγχος συσχέτισης και ανεξαρτησίας των δεδομένων.
description: This paper studies the dynamics of the food industry during the economic crisis time period. The Key objectives of this study are to analyze the food and beverage sector and also the investigation of consumer attitude in relation to their consumption habits during this period. Initially, the food and beverage industry is analyzed through the financial ratios of the industry and moreover is carried out an analysis of the financial statements and the calculation of some basic ratios of a representative sample of companies. For the purposes of this study were selected three food industries from the region of Macedonia. Specifically selected the Kri-Kri Dairy Industry SA business, Mills Halkidiki SA and the Hellenic Dough (Michael Arambatzis SA). Then the investigation of consumer attitude in relation to their consumption habits, during the economic crisis, is performed using a questionnaire. The research was conducted in the urban area of Thessaloniki and the sample was consisted of 400 consumers. The statistical analysis of the questionnaire data was performed using statistical package SPSS version 20 (Statistical Package for Social Sciences), which held a descriptive analysis of the data of the questionnaire and later was conducted a statistical test of the correlation and the independence of data.
Two-loop QED corrections with closed fermion loops
Creators: name: Yerokhin, V. A.
name: Indelicato, P.
name: Shabaev, V. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report a calculation of all two-loop QED corrections with closed fermion loops for the n=1 and n=2 states of H-like ions and for a wide range of the nuclear charge numbers Z=1-100. The calculation is performed to all orders in the binding-strength parameter (Z α), with the exception that in a few cases the free-loop approximation is employed in the treatment of the fermion loops. Detailed comparison is made with previous (Z α)-expansion calculations and the higher-order remainder term to order α^2 (Z α)^6 is identified.
description: Analysis of the finite nuclear size effect is extended in the revised version. 12 pages, 5 figures, 4 tables
Giant plasmonic bubbles nucleation under different ambient pressures
Creators: name: Zeng, Binglin
name: Wang, Yuliang
name: Zaytsev, Mikhail E.
name: Xia, Chenliang
name: Zandvliet, Harold J. W.
name: Lohse, Detlef
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: A.0
subject: 76-05

description: Water-immersed gold nanoparticles irradiated by a laser can trigger the nucleation of plasmonic bubbles after a delay time of a few microseconds [Wang et al., Proc. Natl. Acad. Sci. USA 122, 9253,(2018)]. Here we systematically investigated the light-vapor conversion efficiency, η, of these plasmonic bubbles as a function of the ambient pressure. The efficiency of the formation of these initial-phase and mainly water-vapor containing bubbles, which is defined as the ratio of the energy that is required to form the vapor bubbles and the total energy dumped in the gold nanoparticles before nucleation of the bubble by the laser, can be as high as 25%. The amount of vaporized water first scales linearly with the total laser energy dumped in the gold nanoparticles before nucleation, but for larger energies the amount of vaporized water levels off. The efficiency η decreases with increasing ambient pressure. The experimental observations can be quantitatively understood within a theoretical framework based on the thermal diffusion equation and the thermal dynamics of the phase transition.
description: 8 pages, 6 figures
Modeling of simultaneous processes of water flow, heat transfer, and multicomponent reactive solute transport in saturated-unsaturated porous media
Creators: name: Wu, Guangxi
Publisher: name: University of British Columbia
Year: 2009

description: A mathematical model has been developed to describe the simultaneous transport of water, heat, and multicomponent reactive chemicals in saturated-unsaturated subsurface soils. The water movement equation takes into account vapor transport in the unsaturated zone, as well as the fluxes caused by the gradients of temperature and solute concentration. The solute transport equations are formulated in terms of the total analytical concentration of each component species. Chemical reactions that can be dealt with in this model include complexation, acid base reaction, ion exchange, and precipitation-dissolution. The mathematical model has been solved by the Galerkin finite element method. The chemical transport equations are solved sequentially and separately from the chemical reaction equations, which are solved by the Newton-Raphson method. An iterative procedure is used among water flow equation, heat transfer equation, solute transport equations and chemical reaction equations. Three methods of solving the resulting systems of linear equations are implemented: the banded matrix method, the sparse matrix method, and the iterative methods. Two efficient and reliable iterative methods are provided: the conjugate gradient method for symmetric matrix equations and the bi-conjugate gradient squared method for general nonsymmetric matrix equations. The chemical system can be considered as either an open or a closed system. It has been demonstrated that the computer model can be used to solve one-, two-, and three dimensional problems. The model was used to simulate processes of salinization and leaching of soils under irrigation with realistic conditions. The soil solution included 48 chemical species in total. The computer model was used to simulate salinization of the soil if the irrigation rate was set equal to the crop uptake so that there was no leaching taking place. The simulation continued with increased rate and improved quality of irrigation water so that leaching of the saline soil took place. During both stages of the simulation, the computer model was shown to provide reason able results as how the dissolved concentrations changed in the soil solution during the salinization and leaching processes, how the composition on the exchange sites adjusted to new equilibrium, and how minerals dynamically precipitated and dissolved depending on degree of saturation of the soil solution with respect to each mineral.
Statistical mechanical foundation of Weber-Fechner laws
Creators: name: Maes, Christian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Even though the phenomenological relations between perception and stimulus have been firmly established, a theoretical argument for Weber's and Fechner's law in terms of relevant models or from statistical physics is largely missing. We present such a discussion in terms of response theory for nonequilibrium systems, where the induced displacement or current, which stands for the perceived stimulus, crucially depends on the change in time-symmetric reactivities. Stationary nonequilibria may indeed generate extra currents by changing the dynamical activity. The argument finishes by understanding how the extra dynamical activity logarithmically encodes the actual stimulus.
Comparison of filters for the detection of point sources in Planck simulations
Creators: name: Lopez-Caniego, M.
name: Herranz, D.
name: Gonzalez-Nuevo, J.
name: Sanz, J. L.
name: Barreiro, R. B.
name: Vielva, P.
name: Argueso, F.
name: Toffolatti, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the detection of extragalactic point sources in two-dimensional flat simulations for all the frequencies of the forthcoming ESA's Planck mission. In this work we have used the most recent available templates of the microwave sky: as for the diffuse Galactic components and the Sunyaev-Zel'dovich clusters we have used the ``Plank Reference Sky Model''; as for the extragalactic point sources, our simulations - which comprise all the source populations relevant in this frequency interval - are based on up-to-date cosmological evolution models for sources. To consistently compare the capabilities of different filters for the compilation of the - hopefully - most complete blind catalogue of point sources, we have obtained three catalogues by filtering the simulated sky maps with: the Matched Filter (MF), the Mexican Hat Wavelet (MHW1) and the Mexican Hat Wavelet 2 (MHW2), the first two members of the MHW Family. For the nine Planck frequencies we show the number of real and spurious detections and the percentage of spurious detections at different flux detection limits as well as the completeness level of the catalogues and the average errors in the estimation of the flux density of detected sources. Allowing a 5 % of spurious detections, we obtain the following number of detections by filtering with the MHW2 an area equivalent to half of the sky: 580 (30 GHz), 342 (44 GHz), 341 (70 GHz), 730 (100 GHz), 1130 (143 GHz), 1233 (217 GHz), 990 (353 GHz), 1025 (545 GHz) and 3183 (857 GHz). Our current results indicate that the MF and the MHW2 yield similar results, whereas the MHW1 performs worse in some cases and especially at very low fluxes. This is a relevant result, because we are able to obtain comparable results with the well known Matched Filter and with this specific wavelet, the MHW2, which is much easier to implement and use.
description: 20 pages, 14 figures. Accepted for publication in MNRAS
On an Analogue of the Conjecture of Birch and Swinnerton-Dyer for Abelian Schemes over Higher Dimensional Bases over Finite Fields
Creators: name: Keller, Timo
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2019

description: We formulate an analogue of the conjecture of Birch and Swinnerton-Dyer for Abelian schemes with everywhere good reduction over higher dimensional bases over finite fields of characteristic $p$. We prove the prime-to-$p$ part conditionally on the finiteness of the $p$-primary part of the Tate-Shafarevich group or the equality of the analytic and the algebraic rank. If the base is a product of curves, Abelian varieties and K3 surfaces, we prove the prime-to-$p$ part of the conjecture for constant or isoconstant Abelian schemes, in particular the prime-to-$p$ part for (1) relative elliptic curves with good reduction or (2) Abelian schemes with constant isomorphism type of $\mathscr{A}[p]$ or (3) Abelian schemes with supersingular generic fibre, and the full conjecture for relative elliptic curves with good reduction over curves and for constant Abelian schemes over arbitrary bases. We also reduce the conjecture to the case of surfaces as the basis.
description: DOCUMENTA MATHEMATICA, Vol 24 (2019), p. 915-993
Wegner estimate for random divergence-type operators monotone in the randomness
Creators: name: Dicke, Alexander
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Probability (math.PR)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: Primary 47B80, Secondary 35P15, 35J15, 35R60

description: In this note, a Wegner estimate for random divergence-type operators that are monotone in the randomness is proven. The proof is based on a recently shown unique continuation estimate for the gradient and the ensuing eigenvalue liftings. The random model which is studied here contains quite general random perturbations, among others, some that have a non-linear dependence on the random parameters.
description: 12 pages, 1 figure
Localization for Yang-Mills Theory on the Fuzzy Sphere
Creators: name: Steinacker, Harold
name: Szabo, Richard J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a new model for Yang-Mills theory on the fuzzy sphere in which the configuration space of gauge fields is given by a coadjoint orbit. In the classical limit it reduces to ordinary Yang-Mills theory on the sphere. We find all classical solutions of the gauge theory and use nonabelian localization techniques to write the partition function entirely as a sum over local contributions from critical points of the action, which are evaluated explicitly. The partition function of ordinary Yang-Mills theory on the sphere is recovered in the classical limit as a sum over instantons. We also apply abelian localization techniques and the geometry of symmetric spaces to derive an explicit combinatorial expression for the partition function, and compare the two approaches. These extend the standard techniques for solving gauge theory on the sphere to the fuzzy case in a rigorous framework.
description: 55 pages. V2: references added; V3: minor corrections, reference added; Final version to be published in Communications in Mathematical Physics
Some properties of circle maps with zero topological entropy
Creators: name: Yang, Yini
Publisher: name: arXiv
Year: 2020
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: For a circle map $f\colon\mathbb{S}\to\mathbb{S}$ with zero topological entropy, we show that a non-diagonal pair $\langle x,y\rangle\in \mathbb{S}\times \mathbb{S}$ is non-separable if and only if it is an IN-pair if and only if it is an IT-pair. We also show that if a circle map is topological null then the maximal pattern entropy of every open cover is of polynomial order.
Light propagation through closed-loop atomic media beyond the multiphoton resonance condition
Creators: name: Mahmoudi, Mohammad
name: Evers, Joerg
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The light propagation of a probe field pulse in a four-level double-lambda type system driven by laser fields that form a closed interaction loop is studied. Due to the finite frequency width of the probe pulse, a time-independent analysis relying on the multiphoton resonance assumption is insufficient. Thus we apply a Floquet decomposition of the equations of motion to solve the time-dependent problem beyond the multiphoton resonance condition. We find that the various Floquet components can be interpreted in terms of different scattering processes, and that the medium response oscillating in phase with the probe field in general is not phase-dependent. The phase dependence arises from a scattering of the coupling fields into the probe field mode at a frequency which in general differs from the probe field frequency. We thus conclude that in particular for short pulses with a large frequency width, inducing a closed loop interaction contour may not be advantageous, since otherwise the phase-dependent medium response may lead to a distortion of the pulse shape. Finally, using our time-dependent analysis, we demonstrate that both the closed-loop and the non-closed loop configuration allow for sub- and superluminal light propagation with small absorption or even gain. Further, we identify one of the coupling field Rabi frequencies as a control parameter that allows to conveniently switch between sub- and superluminal light propagation.
description: 10 pages, 8 figures
Η υπαναχώρηση από την απόπειρα και το εκούσιο αυτής
Creators: name: Σαράφογλου, Ουρανία Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Απόπειρα
Υπαναχώρηση
Εκούσιο
Attempt
Withdrawal
Voluntary

description: Αντικείμενο της παρούσας διατριβής είναι τα χαρακτηριστικά της υπαναχώρησης, τόσο ως αντιδιαστολής στο αποτυχημένο έγκλημα όσο και ως αυθύπαρκτου δογματικού μεγέθους, με έμφαση στο μέγεθος της εκούσιας υπαναχώρησης. Για τις ανάγκες του πρώτου αντικειμένου μελέτης προβήκαμε σε διάκριση μεταξύ των εννοιών της αποτυχημένης και της μη πεπερασμένης απόπειρας, σε παρουσίαση του τρόπου βάσει του οποίου θεωρούμε μία απόπειρα ως αποτυχημένη, καθώς και στις μορφές υπό τις οποίες εμφανίζεται η τελευταία. Για τις ανάγκες του δεύτερου και τρίτου αντικειμένου μελέτης προβήκαμε σε νοηματοδότηση της έννοιας της υπαναχώρησης γενικά και, περαιτέρω, σε ανάλυση του εκούσιου χαρακτήρα της. Παρουσιάσαμε τη νομική φύση της εκούσιας υπαναχώρησης, τη ratio θέσπισής της, τις θεωρίες ερμηνείας του εκουσίου και τη θέση που υιοθετεί ο νόμος, με επίκληση της Αιτιολογικής Έκθεσης. Τέλος, περιελάβαμε παραδείγματα από τη νομολογία, ελληνική και ξένη.
description: The subject of the present thesis is the withdrawal from a crime in general, and its voluntary character in particular. At first, we analyze the phenomenon of the “failed attempt” of a crime, which actually lies outside the research field as not being subject to the concept of withdrawal, for it leaves no room for the perpetrator to withdraw. The second subject of study is the act of withdrawal and its characteristics, namely the act of not committing a crime and doing so being fully aware that the criminal result will not occur. Last but not least, we examine the notion “voluntary withdrawal”, by presenting the several theories on the issue and by providing a quick look on the relevant jurisprudence.
On the Boundary and Intersection Motives of Genus 2 Hilbert-Siegel Varieties
Creators: name: Cavicchi, Mattia
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2019

description: We study genus 2 Hilbert-Siegel varieties, i.e. Shimura varieties $S_K$ corresponding to the group $GSp_{4,F}$ over a totally real field $F$, along with the relative Chow motives $^\lambda \mathcal{V}$ of abelian type over $S_K$ obtained from irreducible representations $V_{\lambda}$ of$GSp_{4,F}$. We analyse the weight filtration on the degeneration of such motives at the boundary of the Baily-Borel compactification and we find a criterion on the highest weight $\lambda$, potentially generalisable to other families of Shimura varieties, which characterizes the absence of the \emph{middle weights} 0 and 1 in the corresponding degeneration. Thanks to Wildeshaus' theory, the absence of these weights allows us to construct Hecke-equivariant Chow motives over $\mathbb{Q}$, whose realizations equal interior (or intersection) cohomology of $S_K$ with $V_{\lambda}$-coefficients. We give applications to the construction of homological motives associated to automorphic representations.
description: DOCUMENTA MATHEMATICA, Vol 24 (2019), p. 1033-1098
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Neptune
Creators: name: Perks, Graeme
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: Report on the wreck of the Neptune: a fully rigged ship, a square rigger with at least three masts on passage from New Orleans to Liverpool.
Deep Pairwise Hashing for Cold-start Recommendation
Creators: name: Zhang, Yan
name: Tsang, Ivor W.
name: Yin, Hongzhi
name: Yang, Guowu
name: Lian, Defu
name: Li, Jingjing
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Recommendation efficiency and data sparsity problems have been regarded as two challenges of improving performance for online recommendation. Most of the previous related work focus on improving recommendation accuracy instead of efficiency. In this paper, we propose a Deep Pairwise Hashing (DPH) to map users and items to binary vectors in Hamming space, where a user's preference for an item can be efficiently calculated by Hamming distance, which significantly improves the efficiency of online recommendation. To alleviate data sparsity and cold-start problems, the user-item interactive information and item content information are unified to learn effective representations of items and users. Specifically, we first pre-train robust item representation from item content data by a Denoising Auto-encoder instead of other deterministic deep learning frameworks; then we finetune the entire framework by adding a pairwise loss objective with discrete constraints; moreover, DPH aims to minimize a pairwise ranking loss that is consistent with the ultimate goal of recommendation. Finally, we adopt the alternating optimization method to optimize the proposed model with discrete constraints. Extensive experiments on three different datasets show that DPH can significantly advance the state-of-the-art frameworks regarding data sparsity and item cold-start recommendation.
description: 13 pages, 8 figures, 6 tables, submitted to TKDE
Higgs at the Tevatron in Extended Supersymmetric Models
Creators: name: Stelzer, Tim
name: Wiesenfeldt, Soren
name: Willenbrock, Scott
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Supersymmetric models with an additional singlet field offer the Higgs boson the possibility to decay to two pseudoscalars, a. If the mass of these pseudoscalars is above the b bbar threshold, a -> b bbar is generically the dominant decay mode. The decay h -> a a -> b bbar b bbar may be seen above backgrounds at the Tevatron if the Higgs production cross section is enhanced relative to that of the standard model.
description: 3 pages
Πρόβλεψη πωλήσεων ειδών ζαχαροπλαστείου
Creators: name: Καραγκοζίδης, Ηλίας Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Πρόβλεψη πωλήσεων ειδών ζαχαροπλαστείου
Μηχανική μάθηση
Πρόβλεψη πωλήσεων με την βιβλιοθήκη του Weka
Patisserie sales forecasting
Machime learning
Sales forecasting with Weka library

description: Τα τελευταία χρόνια παρατηρείται ένα έντονο ενδιαφέρον προς στον τομέα της μηχανικής μάθησης και της εξόρυξης γνώσης. Η μηχανική μάθηση είναι μία περιοχή της τεχνικής νοημοσύνης η οποία αφορά αλγορίθμους που επιτρέπουν στους υπολογιστές να "μαθαίνουν". Με την υλοποίηση αλγορίθμων της μηχανικής μάθησης καθίσταται δυνατή η κατασκευή προσαρμόσιμων συστημάτων τα οποία λειτουργούν με βάση την αυτοματοποιημένη ανάλυση συνόλων δεδομένων.Η διπλωματική αυτή ασχολείται με την υλοποίηση ενός συστήματος πρόβλεψης πωλήσεων ειδών ζαχαροπλαστείου. Το περιβάλλον λειτουργίας που δημιουργήθηκε είναι η εφαρμογή Ιscom η οποία είναι υλοποιημένη σε γλώσσα προγραμματίσου Java και χρησιμοποιεί την διαδεδομένη πλατφόρμα αλγορίθμων μηχανικής μάθησης Weka. Η εφαρμογή συνεργάζεται με μία βάση δεδομένων υλοποιημένη σε περιβάλλον MySQL, η οποία έχει αποθηκευμένα κάποια προϊόντα και τις πωλήσεις τους κατά την περίοδο 2012 – 2013. Ανακτά και αναλύει τις πωλήσεις των προϊόντων και με την χρήση διαφόρων αλγορίθμων της βιβλιοθήκης Weka κατασκευάζει μοντέλα πρόβλεψης τα οποία αξιολογούνται και αποθηκεύονται ξανά πίσω στην βάση δεδομένων και χρησιμοποιούνται από το πρόγραμμα για να προβλέψει την κατανάλωση κάποιου από τα προϊόντα για κάποια μελλοντική ημερομηνία την οποία επιλέγει ο χρήστης.Αυτό το εργαλείο θα έρθει ουσιαστικά να αντικαταστήσει τον υπεύθυνο ή τον διευθυντή πωλήσεων, προσφέροντας υπηρεσίες που θα έχουν ως στόχο να προσφέρουν αξιόπιστες προβλέψεις με σκοπό την αύξηση των κερδών.
description: Over the past few years there has been a growing interest in the field of machine learning and data mining. The machine learning is an area of artificial intelligence which is a large collection of algorithms that allow computers to "learn". With the implementation of machine learning algorithms we can build customizable systems that operate on the automated analysis of datasets.This graduation project deals with the implementation of a patisserie sales forecasting System. The software that was created is the application named ‘Iscom’ which was implemented in Java programming language and uses the Weka machine learning algorithms library. The application works with a database implemented on MySQL where we store the patisseries products and their sales over the period 2012 - 2013. The application reads and analyzes the sales of products and with the use of various algorithms of Weka library, it builds predictive models that are used by the program to predict the sales of those products for future dates.This application comes essentially to replace the sales manager, providing services that aim to offer reliable patisserie sales predictions in order to increase profits.
Αλγόριθμοι μετασχηματισμού τύπων της LTL σε Büchi αυτόματα.
Creators: name: Στεφανίδου, Ευδοξία Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Έλεγχος μοντέλου
Αυτόματα πεπερασμένων καταστάσεων και πεπερασμένων μεταβάσεων
Γραμμική χρονική λογική
Model checking
Finite-state automata
Linear Temporal Logic

description: Στην παρούσα διπλωματική εργασία, στόχος είναι να περιγράψουμε δύο μεθόδους κατασκευής αυτομάτων, που να αναγνωρίζουν τις ίδιες ακολουθίες λέξεων που ικανοποιούν έναν συγκεκριμένο τύπο της LTL. Ξεκινούμε με τους ορισμούς των Büchi αυτομάτων, των γενικευμένων Büchi αυτόματων και άλλων παραλλαγών τους, καθώς και της γραμμικής χρονικής λογικής. Στη συνέχεια, περιγράφεται αναλυτικά η μέθοδος του Pierre Wolper, για την κατασκευή ενός Büchi αυτομάτου το οποίο αναγνωρίζει μία γλώσσα που αποτελείται από τις λέξεις εκείνες που ικανοποιούν έναν συγκεκριμένο τύπο (LTL formula), που είναι η μετάφραση της ιδιότητας που θέλουμε να ικανοποιεί το σύστημα. Ακολουθεί ανάλυση της μεθόδου των Dimitra Giannakopoulou και Flavio Lerda, η οποία εφαρμόζεται με σκοπό τη μείωση του μεγέθους των αυτομάτων που παράγουμε. Στο τέλος της διπλωματικής, υπάρχει μία σύγκριση αυτών των δύο μεθόδων μαζί με κάποια συμπεράσματα, καθώς και δυνατότητες βελτίωσης που υπάρχουν.
description: Given a specific system and an appropriate property, we would like to check whether the system complies with this requirement. In order to study a system, we consider the model-based design, in which systems are designed at a higher level of abstraction. In particular, such models are mainly expressed by finite-state automata, while the required properties are described by using formal expressions of a proper logic as the linear temporal logic (LTL). Firstly, we present the aforementioned basic notions, and in the sequel we analyze two methods for translating LTL formulas to Büchi automata: the first one was introduced by Pierre Wolper and the other one by Dimitra Giannakopoulou and Flavio Lerda. We present a comparison of the two methods, which is based on the size of the automaton generated and conclude by highlighting the most important points of the present Master Thesis.
The Syntomic Realization of the Elliptic Polylogarithm via the Poincar\'e Bundle
Creators: name: Sprang, Johannes
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2019

description: We give an explicit description of the syntomic elliptic polylogarithm on the universal elliptic curve over the ordinary locus of the modular curve in terms of certain $p$-adic analytic moment functions associated to Katz' two-variable $p$-adic Eisenstein measure. The present work generalizes previous results of Bannai-Kobayashi-Tsuji and Bannai-Kings on the syntomic Eisenstein classes.
description: DOCUMENTA MATHEMATICA, Vol 24 (2019), p. 1099-1134
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Newry
Creators: name: Adamczyk, Richard
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: This report aims to uncover information about the Newry, a sailing ship that wrecked off the coast of Anelog, Wales in 1830 while transporting Irish emigrants to Canada. Through extensive online research, the history of the Newry's previous voyages was uncovered and the detailed story of the vessel's wrecking event was compiled.
On Derived Equivalences of K3 Surfaces in Positive Characteristic
Creators: name: Srivastava, Tanya Kaushal
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2019

description: For an ordinary K3 surface over an algebraically closed field of positive characteristic we show that every automorphism lifts to characteristic zero. Moreover, we show that the Fourier-Mukai partners of an ordinary K3 surface are in one-to-one correspondence with the Fourier-Mukai partners of the geometric generic fiber of its canonical lift. We also prove that the explicit counting formula for Fourier-Mukai partners of the K3 surfaces with Picard rank two and with discriminant equal to minus of a prime number, in terms of the class number of the prime, holds over a field of positive characteristic as well. We show that the image of the derived autoequivalence group of a K3 surface of finite height in the group of isometries of its crystalline cohomology has index at least two. Moreover, we provide a conditional upper bound on the kernel of this natural cohomological descent map. Further, we give an extended remark in the appendix on the possibility of an F-crystal structure on the crystalline cohomology of a K3 surface over an algebraically closed field of positive characteristic and show that the naive F-crystal structure fails in being compatible with inner product.
description: DOCUMENTA MATHEMATICA, Vol 24 (2019), p. 1135-1177
The search for magnetic fields in two Wolf-Rayet stars and the discovery of a variable magnetic field in WR55
Creators: name: Hubrig, S.
name: Schöller, M.
name: Cikota, A.
name: Jarvinen, S. P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Magnetic fields in Wolf-Rayet (WR) stars are not well explored, although there is indirect evidence, e.g. from spectral variability and X-ray emission, that magnetic fields should be present in these stars. Being in an advanced stage of their evolution, WR stars have lost their hydrogen envelope, but their dense winds make the stellar core almost unobservable. To substantiate the expectations on the presence of magnetic fields in the most-evolved massive stars, we selected two WR stars, WR46 and WR55, for the search of the presence of magnetic fields using FORS2 spectropolarimetric observations. We achieve a formally definite detection of a variable mean longitudinal magnetic field of the order of a few hundred Gauss in WR55. The field detection in this star, which is associated with the ring nebula RCW78 and the molecular environment, is of exceptional importance for our understanding of star formation. No field detection at a significance level of 3sigma was achieved for WR46, but the variability of the measured field strengths can be rather well phased with the rotation period of 15.5h previously suggested by FUSE observations.
description: 5 pages, 1 table, 3 figures, accepted for publication as a letter to MNRAS
Tο φαινόμενο των offshore εταιρειών και η αντιμετώπισή τους στο Ελληνικό Φορολογικό Δίκαιο
Creators: name: Δημογεροντάκης, Εμμανουήλ Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Υπεράκτιες Εταιρείες
Φορολογικό Δίκαιο
Φοροαποφυγή
Offshore Companies
Tax Law
Tax Avoidance

description: Σκοπός της διατριβής ήταν η μελέτη των υπεράκτιων εταιρειών και η αντιμετώπισή τους στο Ελληνικό Φορολογικό Δίκαιο. Ιδιαίτερη έμφαση δόθηκε στις πρόσφατες νομοθετικές ρυθμίσεις αντιμετώπισης των φαινομένων φοροαποφυγής και συμβατότητα αυτών με το Ενωσιακό Δίκαιο
description: The aim of the present thesis was the study of offshore companies and their treatment in Greek Tax Law .Particular emphasis was placed on recent legislative initiatives to combat tax avoidance phenomena and on the compatibility of these legislative initiatives with EU law.
Lyapunov exponents of heavy particles in turbulence
Creators: name: Bec, Jeremie
name: Biferale, Luca
name: Boffetta, Guido
name: Cencini, Massimo
name: Musacchio, Stefano
name: Toschi, Federico
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Lyapunov exponents of heavy particles and tracers advected by homogeneous and isotropic turbulent flows are investigated by means of direct numerical simulations. For large values of the Stokes number, the main effect of inertia is to reduce the chaoticity with respect to fluid tracers. Conversely, for small inertia, a counter-intuitive increase of the first Lyapunov exponent is observed. The flow intermittency is found to induce a Reynolds number dependency for the statistics of the finite time Lyapunov exponents of tracers. Such intermittency effects are found to persist at increasing inertia.
description: 4 pages, 4 figures
Blockchain platform for COVID-19 vaccine supply management
Creators: name: Antal, Claudia Daniela
name: Cioara, Tudor
name: Antal, Marcel
name: Anghel, Ionut
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences
subject: C.2.4

description: In the context of the COVID-19 pandemic, the rapid roll-out of a vaccine and the implementation of a worldwide immunization campaign is critical, but its success will depend on the availability of an operational and transparent distribution chain that can be audited by all relevant stakeholders. In this paper, we discuss how blockchain technology can be used for assuring the transparent tracing of COVID-19 vaccine registration, storage and delivery, and side effects self-reporting. We present such system implementation in which blockchain technology is used for assuring data integrity and immutability in case of beneficiary registration for vaccination, eliminating identity thefts and impersonations. Smart contracts are defined to monitor and track the proper vaccine distribution conditions against the safe handling rules defined by vaccine producers enabling the awareness of all network peers. For vaccine administration, a transparent and tamper-proof side effects self-reporting solution is provided considering person identification and administrated vaccine association. A prototype was implemented using the Ethereum test network, Ropsten, considering the COVID-19 vaccine distribution tracking conditions. The results obtained for each on-chain operation can be checked and validated on the Etherscan, demonstrating various aspects of the proposed system such as immunization actors and safe rules registration, vaccine tracking, and administration. In terms of throughput and scalability, the proposed blockchain system shows promising results.
Higher Zigzag Algebras
Creators: name: Grant, Joseph
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2019

description: Given a Koszul algebra of finite global dimension we define its higher zigzag algebra as a twisted trivial extension of the Koszul dual. If our original algebra is the path algebra of a tree-type quiver, this construction recovers the zigzag algebras of Huerfano-Khovanov. We study examples of higher zigzag algebras coming from Iyama's type A higher representation finite algebras, give their presentations by quivers and relations, and describe relations between spherical twists acting on their derived categories. We connect this to the McKay correspondence in higher dimensions: if $G$ is a finite abelian subgroup of $SL_{d+1}$ then these relations occur between spherical twists for $G$-equivariant sheaves on affine $(d+1)$-space.
description: DOCUMENTA MATHEMATICA, Vol 24 (2019), p. 749-814
Bispectrum and Nonlinear Biasing of Galaxies: Perturbation Analysis, Numerical Simulation and SDSS Galaxy Clustering
Creators: name: Nishimichi, Takahiro
name: Kayo, Issha
name: Hikage, Chiaki
name: Yahata, Kazuhiro
name: Taruya, Atsushi
name: Jing, Y. P.
name: Sheth, Ravi K.
name: Suto, Yasushi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider nonlinear biasing models of galaxies with particular attention to a correlation between linear and quadratic biasing coefficients, b_1 and b_2. We first derive perturbative expressions for b_1 and b_2 in halo and peak biasing models. Then we compute power spectra and bispectra of dark matter particles and halos using N-body simulation data and of volume-limited subsamples of Sloan Digital Sky Survey (SDSS) galaxies, and determine their b_1 and b_2. We find that the values of those coefficients at linear regimes (k<0.2h/Mpc) are fairly insensitive to the redshift-space distortion and the survey volume shape. The resulting normalized amplitudes of bispectra, Q, for equilateral triangles, are insensitive to the values of b_1 implying that b_2 indeed correlates with b_1. The present results explain the previous finding of Kayo et al. (2004) for the hierarchical relation of three-point correlation functions of SDSS galaxies. While the relations between b_1 and b_2 are quantitatively different for specific biasing models, their approximately similar correlations indicate a fairly generic outcome of the biasing due to the gravity in primordial Gaussian density fields.
description: 14 pages, 8 figures, accepted for publication in PASJ