cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Two-body metal-insulator transitions in the Anderson-Hubbard model
Creators: name: Stellin, Filippo
name: Orso, Giuliano
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We review our recent results on Anderson localization in systems of two interacting particles coupled by contact interactions. Based on an exact mapping to an effective single-particle problem, we numerically investigate the occurrence of metal-insulator phase transitions for the pair in two- (2D) and three-dimensional (3D) disordered lattices. In two dimensions, we find that interactions cause an exponential enhancement of the pair localization length with respect to its single-particle counterpart, but do not induce a delocalization transition. In particular we show that previous claims of 2D interaction-induced Anderson transitions are the results of strong finite-size effects. In three dimensions we find that the pair undergoes a metal-insulator transition belonging to the same (orthogonal) universality class of the noninteracting model. We then explore the phase diagram in the space of energy E, disorder W and interaction strength U, which reveals a rich and counterintuitive structure, endowed with multiple metallic and insulating phases. We point out that this phenomenon originates from the molecular and scattering-like nature of the pair states available at given energy and disorder strength.
description: Review talk at Moscow CSP 2020, 7 pages, 3 figures, conference proceedings to appear in Journal of Physics: Conference Series
Principled principals?
Creators: name: Pike, Ryan
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Comparative Politics
subject: Soviet and Post-Soviet Studies
subject: Political Science
subject: FOS: Political science
subject: International Relations
subject: Social and Behavioral Sciences
subject: International and Area Studies

description: How do relevant parties communicate with the public about ongoing geopolitical crises? And how do different combinations of sources and frames affect individual beliefs and engagement? In the wake of a geopolitical crisis, individuals are presented with a wide variety information -- especially through social media. This pre-analysis plan details our experimental design, hypotheses, and analysis strategy for a survey experiment using mock Facebook posts to assess the impact of countries' varying use of normative principles on respondents geopolitical beliefs. By using a factorial design, we adjudicate between competing hypotheses about the impact of signaling and preference formation in IR, including principle ownership, motivated reasoning, and political knowledge. The survey experiment will be run in Hungary in late March/early April 2023.
On the extrinsic principal directions and curvatures of Lagrangian submanifolds
Creators: name: Moruz, Marilena
name: Verstraelen, Leopold
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53B25, 53C42, 53D12

description: From the basic geometry of submanifolds will be recalled what are the extrinsic principal tangential directions, (first studied by Camille Jordan in the $18$seventies), and what are the principal first normal directions, (first studied by Kostadin Trencevski in the $19$nineties), and what are their corresponding Casorati curvatures. For reasons of simplicity of exposition only, hereafter this will merely be done explicitly in the case of arbitrary submanifolds in Euclidean spaces. Then, for the special case of Lagrangian submanifolds in complex Euclidean spaces, the natural relationships between these distinguished tangential and normal directions and their corresponding curvatures will be established.
Affine and fundamental vector fields
Creators: name: Iliev, Bozhidar Z.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53A15, 53B99, (Primary), 57S25, 20G99 (Secondary)

description: This is a review with examples concerning the concepts of affine (in particular, constant and linear) vector fields and fundamental vector fields on a manifold. The affine, linear and constant vector fields on a manifold are shown to be in a bijective correspondence with the fundamental vector fields on it of respectively general affine, general linear and translation groups (locally) represented on the manifold via the described in this work left actions; in a case of the manifolds R^n and C^n, the actions mentioned have the usual meaning of affine, linear and translation transformations.
description: 20 LaTeX pages. The packages AMS-LaTeX and amsfonts are required. For other papers on the same topic, view http://theo.inrne.bas.bg/~bozho/
Studying the Impact of Social Context during Face Learning on the Cross-Race Face Recognition Deficit
Creators: name: Quadflieg, Susanne
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Social and Behavioral Sciences

description: Many people are worse at recognizing cross-race (CR) faces compared to own-race (OR) faces. Among psychologists, this phenomenon is known as the ‘cross-race face recognition deficit’ (CRD, based on Levin, 2000). Though the CRD is one of the most replicated findings in psychology (cf. Meissner & Brigham, 2001), little is known about how different social contexts during face learning can affect its occurrence. This oversight seems surprising, considering that people’s faces are encountered (i.e., learnt) in a wide range of social contexts in daily life. Above all, a person’s face may be seen for the very first time on its own (e.g., when meeting an individual) or as part of a social dyad or group (e.g., when meeting a couple or a circle of friends). Therefore, the current pre-registration outlines a study that was designed to investigate how changes in social context during face learning can affect the CRD. Specifically, the study examines whether face recognition for CR and OR faces differs depending on whether these faces were initially learnt in the context of so-called same-race dyads or mixed-race dyads.
Memory systems of the brain
Creators: name: Pastor, Alvaro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: Humans have long been fascinated by how memories are formed, how they can be damaged or lost, or still seem vibrant after many years. Thus the search for the locus and organization of memory has had a long history, in which the notion that is is composed of distinct systems developed during the second half of the 20th century. A fundamental dichotomy between conscious and unconscious memory processes was first drawn based on evidences from the study of amnesiac subjects and the systematic experimental work with animals. The use of behavioral and neural measures together with imaging techniques have progressively led researchers to agree in the existence of a variety of neural architectures that support multiple memory systems. This article presents a historical lens with which to contextualize these idea on memory systems, and provides a current account for the multiple memory systems model.
description: 36 pages, 4 figures, draft
Microscopic description of the low-temperature anomalies in silica and lithium silicate via computer simulations
Creators: name: Reinisch, J.
name: Heuer, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Information about the nature of the low-temperature anomalies and in particular the properties of the tunneling systems in silica and lithium silica glasses are revealed via computer simulations. The potential energy landscape of these systems is systematically explored for adjacent pairs of local minima which may act as double-well potentials (DWP) at low temperatures. Three different types of DWP are distinguished, related to perfectly coordinated silica, intrinsic silica defects, and extrinsic defects. Their properties like the spatial extension and the dipole moment are characterized in detail. Furthermore, the absolute number of tunneling systems, i.e. symmetric DWP, is estimated. The results are compared with dielectric echo, specific heat and acoustic experiments on Suprasil I and Suprasil W. A semi-quantitative agreement for all relevant features is obtained.
ЭФФЕКТ ИНОСТРАННОГО ЯЗЫКА: ПРИНЯТИЕ РЕШЕНИЙ В ЭПОХУ БИЛИНГВИЗМА
Creators: name: Турамуратова Ирода Илхомбаевна, доктор философии по филологическим наукам (PhD) УзГУМЯ Хамидуллаев Хасанхужа Фаррух угли Студент 4 курса факультета романо-германской филологии (испанский язык), УзГУМЯ,
Publisher: name: Zenodo
Year: 2024

description: В данной статье рассматривается процесс принятие решений в контексте влияния родного и иностранного языка. Исходя из теории дуальной системы принятия решений, особое внимание уделяется на влияние эффекта иностранного языка на аналитические и эмоциональные аспекты выражения предпочтения и выбора.

Ключевые слова: принятие решений, билингвизм, эффект иностранного языка, эффект фрейминга, утилитаризм, деонтология
Stochastic Dynamical Structure (SDS) of Nonequilibrium Processes in the Absence of Detailed Balance. II: construction of SDS with nonlinear force and multiplicative noise
Creators: name: Ao, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Astrophysics (astro-ph)
subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Biological Physics (physics.bio-ph)
subject: Populations and Evolution (q-bio.PE)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: FOS: Biological sciences

description: There is a whole range of emergent phenomena in non-equilibrium behaviors can be well described by a set of stochastic differential equations. Inspired by an insight gained during our study of robustness and stability in phage lambda genetic switch in modern biology, we found that there exists a classification of generic nonequilibrium processes: In the continuous description in terms of stochastic differential equations, there exists four dynamical elements: the potential function $ϕ$, the friction matrix $ S$, the anti-symmetric matrix $ T $, and the noise. The generic feature of absence of detailed balance is then precisely represented by $T$. For dynamical near a fixed point, whether or not it is stable or not, the stochastic dynamics is linear. A rather complete analysis has been carried out (Kwon, Ao, Thouless, cond-mat/0506280; PNAS, {\bf 102} (2005) 13029), referred to as SDS I. One important and persistent question is the existence of a potential function with nonlinear force and with multiplicative noise, with both nice local dynamical and global steady state properties. Here we demonstrate that a dynamical structure built into stochastic differential equation allows us to construct such a global optimization potential function. First, we provide the construction. One of most important ingredient is the generalized Einstein relation. We then present an approximation scheme: The gradient expansion which turns every order into linear matrix equations. The consistent of such methodology with other known stochastic treatments will be discussed in next paper, SDS III; and the explicitly connection to statistical mechanics and thermodynamics will be discussed in a forthcoming paper, SDS IV.
description: Latex, 9 pages
Dynamical Evidence for Environmental Evolution of Intermediate Redshift Spiral Galaxies
Creators: name: Moran, Sean M.
name: Miller, Neil
name: Treu, Tommaso
name: Ellis, Richard S.
name: Smith, Graham P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Combining resolved optical spectroscopy with panoramic HST imaging, we study the dynamical properties of spiral galaxies as a function of position across two intermediate redshift clusters, and we compare the cluster population to field galaxies in the same redshift range. By modelling the observed rotation curves, we derive maximal rotation velocities for 40 cluster spirals and 37 field spirals, yielding one of the largest matched samples of cluster and field spirals at intermediate redshift. We construct the Tully-Fisher relation in both V and K_S bands, and find that the cluster Tully-Fisher relation exhibits significantly higher scatter than the field relation, in both V and K_S bands. Under the assumption that this increased scatter is due to an interaction with the cluster environment, we examine several dynamical quantities (dynamical mass, mass-to-light ratio, and central mass density) as a function of cluster environment. We find that the central mass densities of star-forming spirals exhibit a sharp break near the cluster Virial radius, with spirals in the cluster outskirts exhibiting significantly lower densities. We argue that the lower-density spirals in the cluster outskirts, combined with the high scatter in both K_S- and V-band TF relations, demonstrate that cluster spirals are kinematically disturbed by their environment, even as far as 2R_VIR from the cluster center. We propose that such disturbances may be due to a combination of galaxy merging and harassment.
description: 16 pages, 8 figures, accepted to ApJ, version with high resolution figures 2 & 3 available at http://www.astro.caltech.edu/~smm/spiral_rotationhi.pdf
Cobalt precipitation by reduction with sodium borohydride
Creators: name: Lu, Jianming
Publisher: name: University of British Columbia
Year: 2009

description: The reaction of cobalt reduction with borohydride is very complicated. Various authors obtained different reaction stoichiometries and have proposed a number of mechanisms. There are conflicting claims about the removal of cobalt from zinc electrolyte with sodium borohydride. The present research has focused on the stoichiometry of cobalt reduction with borohydride and on the removal of cobalt from zinc sulphate solution. Cobalt reduction with borohydride releases hydrogen ions resulting in a decrease in the pH of the solution. The efficiency of cobalt reduction increased with increasing concentration of NaOH in the reducing solution. The NaOH in the reducing solution neutralized the hydrogen ions released during cobalt reduction. The best reduction efficiency without the precipitation of cobalt hydroxide is one mole of sodium borohydride to reduce one mole of cobalt (II). If the pH was controlled at 4, the maximum reduction efficiency was about 81 % for a ten-minute addition time and the addition of more sodium borohydride did not increase the reduction efficiency. The reduction efficiency increased with increasing pH from nil at pH 2 to 96% at pH 6 and decreased with increasing temperature. X-ray diffraction patterns and TEM patterns of the recovered precipitates showed them to be amorphous. After a two-hour heat-treatment at 500 °C, the X-ray diffraction pattern of the precipitate showed well-defined peaks due to C 0 2 B with the main peak attributable to cobalt. The single crystal TEM pattern obtained was consistent with that of C 0 2 B . The particle size was about 20-100 nm. The atom ratio of Co to B increased with increasing temperature. The reduction of cobalt ions in the absence of interfering species was completed within several seconds. The time for the reduction of most of the cobalt ions decreased with increasing temperature from 24 seconds at 5 °C to less than 2 seconds at 35 °C. Zinc ions had a dramatic inhibitory effect on cobalt reduction. Several tens of iumol/L of zinc ions completely inhibit cobalt reduction with borohydride. The main cause of inhibition is that zinc ions compete with those of cobalt for borohydride ions and zinc borohydride forms and hydrolyzes rapidly. The resulting zinc ions react further with borohydride. Zinc ions catalyze the hydrolysis of borohydride. Zinc ions also have an inhibitory effect on nickel, cadmium and lead reduction.
Can MOND take a bullet? Analytical comparisons of three versions of MOND beyond spherical symmetry
Creators: name: Angus, Garry W.
name: Famaey, Benoit
name: Zhao, HongSheng
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A proper test of Modified Newtonian Dynamics (MOND) in systems of non-trivial geometries depends on modelling subtle differences in several versions of its postulated theories. This is especially important for lensing and dynamics of barely virialised galaxy clusters with typical gravity of scale $\sim a_0 \sim 1Å{\rm s}^{-2}$. The original MOND formula, the classical single field modification of the Poisson equation, and the multi-field general relativistic theory of Bekenstein (TeVeS) all lead to different predictions as we stray from spherical symmetry. In this paper, we study a class of analytical MONDian models for a system with a semi-Hernquist baryonic profile. After presenting the analytical distribution function of the baryons in spherical limits, we develop orbits and gravitational lensing of the models in non-spherical geometries. In particular, we can generate a multi-centred baryonic system with a weak lensing signal resembling that of the merging galaxy cluster 1E 0657-56 with a bullet-like light distribution. We finally present analytical scale-free highly non-spherical models to show the subtle differences between the single field classical MOND theory and the multi-field TeVeS theory.
description: 14 pages, 9 figures, accepted for publication in MNRAS
Τερηδονική δραστηριότητα και εμφάνιση επιλεγμένων μικροβίων στη στοματική κοιλότητα παιδιών που διαμένουν στην Ελλάδα.
Creators: name: Φράγκου, Στυλιανή Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: mutans streptococci
C. albicans
Dentocult SM strip

description: Οι μικροοργανισμοί S. mutans, S. sobrinus και C. albicans έχουν σχετιστεί με την τερηδονική νόσο. Η γνώση της συχνότητας εμφάνισής τους καθώς και των παραγόντων που ενδέχεται να επηρεάζουν την αποίκισή τους, συνεισφέρει στην καλύτερη κατανόηση της τερηδονικής νόσου. Η παρούσα μελέτη εξετάζει την εμφάνιση των S. mutans, S. sobrinus και C. albicans σε δείγματα μικροβιακής πλάκας και σάλιου παιδιών που εμφανίζουν ή όχι τερηδονικές αλλοιώσεις. Δείγματα σάλιου και μικροβιακής πλάκας από 46 παιδιά ελεύθερα τερηδονικών αλλοιώσεων και 51 παιδιά με τερηδονικές αλλοιώσεις μελετήθηκαν για την εμφάνιση των S. mutans, S. Sobrinus και C. αlbicans. Για την ταυτοποίηση των μικροβίων χρησιμοποιήθηκαν επιλεγμένα μέσα καλλιέργειας, βιοχημικά τεστ, ειδικοί DNA ανιχνευτές και Dentocult SM strips. Σύμφωνα με τα αποτελέσματα, οι S. mutans, S. sobrinus και C. albicans απομονώθηκαν σε ποσοστά 66%, 11% και 18% αντίστοιχα. Τα παιδιά με τερηδονικές αλλοιώσεις εμφάνιζαν πιο συχνά και σε σημαντικά υψηλότερα επίπεδα τα συγκεκριμένα μικρόβια από τα παιδιά χωρίς τερηδονικές αλλοιώσεις. Έτσι, η παρούσα μελέτη καταλήγει στο συμπέρασμα ότι η τερηδονική δραστηριότητα σχετίζεται σημαντικά με την παρουσία και των τριών μικροβίων τόσο στην μικροβιακή πλάκα όσο και στο σάλιο.
description: S. mutans and S. sobrinus are strongly associated with dental caries. C. albicans has also been implicated in early childhood caries. Their mutual interaction and the factors influencing their colonization require further understanding for caries aetiology. The aim of the present study is to examine the occurrence of S. mutans, S. sobrinus and C. albicans in dental plaque and saliva from caries free and caries active Greek children. Saliva and dental plaque samples from 46 caries free and 51 caries active 3-13 year-old children were examined using selective media for the 3 microbes. Identification of isolated mutans streptococci (S. mutans and S. sobrinus) was performed with biochemical test and specific DNA probes. The salivary levels of mutans streptococci were additionally determined by a chair-side test (Dentocult® SM strips). The isolation frequencies of S. mutans, S. sobrinus and C. albicans were 66%, 11%, 18% respectively. Caries active children harboured more often and at significantly higher numbers the specific microbes than caries free children. A similar pattern was observed with the Dentocult® SM strip scores. No correlation was found between the presence of these microbes and the age or gender of the children. Caries activity was significantly related to the presence of all three microbes under study, both in dental plaque and saliva.
Study 2 - change detection with repeated or omitted frames
Creators: name: Simons, Daniel J.
name: Chenwei Zhu
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Cognitive Psychology
subject: Cognition and Perception
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: Component for study 2 examining change detection performance with added/omitted frames
31P NMR study of Na2CuP2O7: a S=1/2 two-dimensional Heisenberg antiferromagnetic system
Creators: name: Nath, R.
name: Mahajan, A. V.
name: Buettgen, N.
name: Kegler, C.
name: Hemberger, J.
name: Loidl, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The magnetic properties of Na2CuP2O7 were investigated by means of 31P nuclear magnetic resonance (NMR), magnetic susceptibility, and heat capacity measurements. We report the 31P NMR shift, the spin-lattice 1/T1, and spin-spin 1/T2 relaxation-rate data as a function of temperature T. The temperature dependence of the NMR shift K(T) is well described by the S=1/2 square lattice Heisenberg antiferromagnetic (HAF) model with an intraplanar exchange of J/k_B \simeq 18\pm2 K and a hyperfine coupling A = (3533\pm185) Oe/mu_B. The 31P NMR spectrum was found to broaden abruptly below T \sim 10 K signifying some kind of transition. However, no anomaly was noticed in the bulk susceptibility data down to 1.8 K. The heat capacity appears to have a weak maximum around 10 K. With decrease in temperatures, the spin-lattice relaxation rate 1/T1 decreases monotonically and appears to agree well with the high temperature series expansion expression for a S = 1/2 2D square lattice.
description: 12 pages, 8 figures, submitted to J. Phys.: Cond. Mat
Quantitative Trace Estimates for the Maxwell system in Lipschitz Domains
Creators: name: Stachura, Eric
name: Wellander, Niklas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We develop various quantitative estimates for the anisotropic Maxwell system in Lipschitz domains, with a focus on how the estimates precisely depend on the Lipschitz character of the domain. We pay special attention to trace operators and extension operators over certain Sobolev spaces. Finally, we provide a weak formulation of the interior scattering problem in terms of the exterior Calderón operator, and provide explicit bounds for the solution of the interior problem in terms of the incident fields and the Lipschitz character of the domain.
Στοχαστικός και Ασαφής Προγραμματισμός στις Εφοδιαστικές Αλυσίδες
Creators: name: Σχορετσανίτη, Ευαγγελία Απόστολου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Διαχείριση Εφοδιαστικής Αλυσίδας (ΔΕΑ)
Ασάφεια
Στοχαστική αβεβαιότητα
Supply Chain Management (SCM)
Fuzziness
Stochastic Uncertainty

description: Η παρούσα διπλωματική εργασία πραγματεύεται την αβεβαιότητα στις εφοδιαστικές αλυσίδες, καταδεικνύοντας τη σημαντικότητα συμπερίληψής της στα διάφορα μοντέλα βελτιστοποίησης. Τα προγενέστερα έτη εφαρμόστηκαν ως επί το πλείστον αιτιοκρατικές μέθοδοι βελτιστοποίησης, οι οποίες όμως δεν κατάφεραν να προσεγγίσουν επαρκώς τις πραγματικές καταστάσεις, που περιλαμβάνουν πολλές μορφές αβεβαιοτήτων. Η εισαγωγή λοιπόν της αβεβαιότητας στα σύγχρονα μοντέλα εφοδιαστικών αλυσίδων αποτελεί ένα καίριο ζήτημα και όχι μια σύγχρονη τάση ή μόδα, που συμβάλλει στην αποτελεσματική αντιμετώπιση των απρόβλεπτων γεγονότων. Με βάση τον τρόπο εκδήλωσής της, η αβεβαιότητα χωρίζεται σε δύο βασικές κατηγορίες, την ασάφεια και την στοχαστική αβεβαιότητα. Η εργασία επικεντρώνεται στην πρώτη κατηγορία και πιο συγκεκριμένα σε προβλήματα ασαφούς προγραμματισμού, αναλύοντας τα βήματα μοντελοποίησης και βελτιστοποίησής τους. Τέλος επιχειρείται η διατύπωση ενός υπάρχοντος δυναμικού αιτιοκρατικού μοντέλου μικτού-ακέραιου γραμμικού προγραμματισμού, με ασάφεια: 1) στον περιορισμό που αφορά στο επιτρεπόμενο επίπεδο των ανεκτέλεστων παραγγελιών, με στόχο την έκφραση της ελαστικότητάς του και 2) στο κόστος προμήθειας προϊόντων, που αποτελεί συντελεστή της αντικειμενικής συνάρτησης, με στόχο την έκφραση της ελλιπούς γνώσης για την τιμή του (υπό την έννοια ότι δεν παραμένει σταθερή και μπορεί ανά πάσα στιγμή να μεταβληθεί).
description: The aim of this dissertation is to highlight the important role that uncertainty in supply chains plays in various optimization models. Previously, many deterministic optimization methods were applied, without approaching at acceptable level realistic conditions, which include numerous types of uncertainties. Therefore, accounting for uncertainty in modern supply chain models is proved to be very effective in providing solutions to unexpected events. Uncertainty can be categorized, according to the way it arises, into fuzziness and stochastic uncertainty. This thesis is focused on the first category and more specifically on fuzzy programming problems, analyzing their modeling and optimization steps. In conclusion, a transformation of an existing dynamic deterministic mixed-integer linear programming model to a fuzzy one is attempted, by considering as fuzzy: 1) the constraint that sets an upper bound for the possible shortages at the construction sites in order to express its flexibility and 2) the parameter of unit purchase cost of products from suppliers, which is a coefficient of the objective function, in order to express the deficient knowledge in data (meaning that its' value often changes).
Ultrahyperfunctional Approach to Non-Commutative Quantum Field Theory
Creators: name: Franco, Daniel H. T.
name: Lourenço, José A.
name: Renoldi, Luiz H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the present paper, we intent to enlarge the axiomatic framework of non-commutative quantum field theories (QFT). We consider QFT on non-commutative spacetimes in terms of the tempered ultrahyperfunctions of Sebastião e Silva corresponding to a convex cone, within the framework formulated by Wightman. Tempered ultrahyperfunctions are representable by means of holomorphic functions. As is well known there are certain advantages to be gained from the representation of distributions in terms of holomorphic functions. In particular, for non-commutative theories the Wightman functions involving the $\star$-product, ${\mathfrak W}^\star_m$, have the same form as the standard form ${\mathfrak W}_m$. We conjecture that the functions ${\mathfrak W}^\star_m$ satisfy a set of properties which actually will characterize a non-commutative QFT in terms of tempered ultrahyperfunctions. In order to support this conjecture, we prove for this setting the validity of some important theorems, of which the CPT theorem and the theorem on the Spin-Statistics connection are the best known. We assume the validity of these theorems for non-commutative QFT in the case of spatial non-commutativity only.
description: Published in "Journal of Physics A"
Magneto-optical determination of the carrier lifetime in coherent Ge(1-x)Sn(x)/Ge heterostructures
Creators: name: Vitiello, Elisa
name: Rossi, Simone
name: Broderick, Christopher A.
name: Gravina, Giorgio
name: Balocchi, Andrea
name: Marie, Xavier
name: O'Reilly, Eoin P.
name: Myronov, Maksym
name: Pezzoli, Fabio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We present a magneto-optical study of the carrier dynamics in compressively strained Ge(1-x)Sn(x) films having Sn compositions up to 10% epitaxially grown on blanket Ge on Si (001) virtual substrates. We leverage the Hanle effect under steady-state excitation to study the spin-dependent optical transitions in presence of an external magnetic field. This allowed us to obtain direct access to the dynamics of the optically-induced carrier population. Our approach singled out that at cryogenic temperatures the effective lifetime of the photogenerated carriers in coherent Ge(1-x)Sn(x) occurs in the sub-ns time scale. Supported by a model estimate of the radiative lifetime, our measurements indicate that carrier recombination is dominated by non-radiative processes. Our results thus provide central information to advance the fundamental understanding of carrier kinetics in this novel direct-gap group-IV material system. Such knowledge can be a stepping stone in the quest for the implementation of Ge(1-x)Sn(x)-based functional devices.
Αρχές και Προδιαγραφές Θαλάσσιου Κτηματολογίου στην Ελλάδα
Creators: name: Δημητρούλη, Μαρία Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Θαλάσσιο Κτηματολόγιο
Τεχνικές προδιαγραφές
Θαλάσσιες δραστηριότητες
Marine Cadastre
Technical Specifications
Marine activities

description: Σκοπός της διατριβής ήταν η παράθεση αρχών και προδιαγραφών για την υλοποίηση Θαλάσσιου Κτηματολογίου στην Ελλάδα. Ορίστηκαν το αντικείμενο και οι στόχοι υλοποίησης ενός τέτοιου έργου, έγινε αναφορά στους εμπλεκόμενους φορείς με τον ελληνικό θαλάσσιο χώρο και στην ισχύουσα ελληνική και διεθνή νομοθεσία, ενώ προτάθηκε ποιος θα είναι ο αρμόδιος φορέας επίβλεψης, υλοποίησης και λειτουργίας του Θαλάσσιου Κτηματολογίου και από πού θα αντληθούν οι απαραίτητοι οικονομικοί πόροι. Στη συνέχεια, με στόχο την εκμετάλλευση της εμπειρίας από τη σύνταξη του Εθνικού Κτηματολογίου και λόγω της άμεσης επαφής μεταξύ στεριάς και θάλασσας, εξετάστηκε η δυνατότητα εφαρμογής των αρχών του Εθνικού Κτηματολογίου στο Θαλάσσιο Κτηματολόγιο. Η διαδικασία υλοποίησης του Θαλάσσιου Κτηματολογίου αναλύθηκε σε στάδια ανάλογα με αυτά του Εθνικού Κτηματολογίου. Επιπλέον, εξετάστηκε η εκτενής νομοθεσία σχετικά με τη διαδικασία αδειοδότησης της κάθε δραστηριότητας που εντοπίζεται στον ελληνικό θαλάσσιο χώρο. Τέλος, προτάθηκαν αναλυτικές τεχνικές προδιαγραφές σύνταξης του Θαλάσσιου Κτηματολογίου, ανάλογες με αυτές του Εθνικού Κτηματολογίου.
description: This thesis was written in order to quote the principles and the requirements for the implementation of a Marine Cadastre in Greece. Initially, the purpose and the aim of the implementation of such a project was defined. Then, reference was made to the stakeholders in the Greek maritime space and to the current Greek and international law. Moreover, it was suggested which institution will be the competent for the supervision, implementation and operation of the Marine Cadastre and which will be the sources of the necessary financial funds for the implementation of the project. Furthermore, the possibility of applying the principles of the National Land Cadastre to the Marine Cadastre was examined, in order to exploit the experience of the drafting of the National Land Cadastre and due to the direct relationship between land and sea. The process of implementing the Marine Cadastre was analyzed in stages similar to those of the National Cadastre. Additionally, it was examined the extensive legislation on the licensing process of each activity identified in Greek sea. As a final step of the project, detailed technical specifications for the design of the Marine Cadastre, similar to those of the National Land Cadastre, was suggested
Synthesis and Characterization of Sodium Iron Antimonate Na2FeSbO5 One-Dimensional Antiferromagnetic Chain Compound with a Spin Glass Ground State
Creators: name: Sitharaman, Uma
name: Tatyana, Vasilchikova
name: Alexey, Sobolev
name: Grigory, Raganyan
name: Aanchal, Sethi
name: Hyun-Joo, Koo
name: Myung-Hwan, Whangbo
name: Igor, Presniakov
name: Iana, Glazkova
name: N., Vasiliev Alexander
name: Sergey, Streltsov
name: Elena, Zvereva
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A new oxide, sodium iron antimonate, Na2FeSbO5, was synthesized and structurally characterized, and its static and dynamic magnetic properties were comprehensively studied both experimentally by dc and ac magnetic susceptibility, magnetization, specific heat, electron spin resonance (ESR) and Moessbauer measurements, and theoretically by density functional calculations. The resulting single-crystal structure (a = 15.6991(9) A; b = 5.3323 (4) A; c = 10.8875(6) A; S.G. Pbna) consists of edge-shared SbO6 octahedral chains, which alternate with vertex-linked, magnetically active FeO4 tetrahedral chains. The 57Fe Moessbauer spectra confirmed the presence of high-spin Fe3+ (3d5) ions in a distorted tetrahedral oxygen coordination. The magnetic susceptibility and specific heat data show the absence of a long-range magnetic ordering in Na2FeSbO5 down to 2 K, but ac magnetic susceptibility unambigously demonstrates spin-glass-type behavior with a unique two-step freezing at Tf1 about 80 K and Tf2 about 35 K. Magnetic hyperfine splitting of 57Fe Moessbauer spectra was observed below T* about 104 K (Tf1 < T*). The spectra just below T* (Tf1 < T < T*) exhibit a relaxation behavior caused by critical spin fluctuations, indicating the existence of short-range correlations. The stochastic model of ionic spin relaxation was used to account for the shape of the Moessbauer spectra below the freezing temperature. A complex slow dynamics is further supported by ESR data revealing two different absorption modes presumably related to ordered and disordered segments of spin chains. The data imply a spin-cluster ground state for Na2FeSbO5.
Natural Entropy Production in an Inflationary Model for a Polarized Vacuum
Creators: name: Berman, Marcelo Samuel
name: Som, Murari M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Physics (physics.gen-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Though entropy production is forbidden in standard FRW Cosmology, Berman and Som presented a simple inflationary model where entropy production by bulk viscosity, during standard inflation without ad hoc pressure terms can be accommodated with Robertson-Walker's metric, so the requirement that the early Universe be anisotropic is not essential in order to have entropy growth during inflationary phase, as we show. Entropy also grows due to shear viscosity, for the anisotropic case. The intrinsically inflationary metric that we propose can be thought of as defining a polarized vacuum, and leads directly to the desired effects without the need of introducing extra pressure terms.
description: 7 pages including front one. Accepted to publication, Astrophysics and Space Science, subjected to a minor correction, already submitted
Detectors for local discrimination of sets of generalized Bell states
Creators: name: Wang, Cai-Hong
name: Yuan, Jiang-Tao
name: Yang, Ying-Hui
name: Li, Mao-Sheng
name: Fei, Shao-Ming
name: Ma, Zhi-Hao
Publisher: name: arXiv
Year: 2025
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81P18, 81P40, 81P48

description: A fundamental problem in quantum information processing is the discrimination among a set of orthogonal quantum states of a composite system under local operations and classical communication (LOCC). Corresponding to the LOCC indistinguishable sets of four ququad-ququad orthogonal maximally entangled states (MESs) constructed by Yu et al. [Phys. Rev. Lett. 109, 020506 (2012)], the maximum commutative sets (MCSs) were introduced as detectors for the local distinguishability of the set of generalized Bell states (GBSs), for which the detectors are sufficient to determine the LOCC distinguishability. In this work, we show how to determine all the detectors for a given GBS set. We construct also several 4-GBS sets without detectors, most of which are one-way LOCC indistinguishable and only one is one-way LOCC distinguishable, indicating that the detectors are not necessary for LOCC distinguishability. Furthermore, we show that for 4-GBS sets in quantum system $\mathbb{C}^{6}\otimes\mathbb{C}^{6}$, the detectors are almost necessary for one-way LOCC distinguishability, except for one set in the sense of local unitary equivalence. The problem of one-way LOCC discrimination of 4-GBS sets in $\mathbb{C}^{6}\otimes\mathbb{C}^{6}$ is completely resolved.
description: 10 pages, 2 figures,7 tables
Coordination-adaptation tradeoffs in collaboration
Creators: name: Bhui, Rahul
name: Vélez, Natalia
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Industrial and Organizational Psychology
subject: Cognitive Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: In collaborative tasks, how do individuals balance between coordinating with others by sticking to standard procedure, and deviating from procedure to adapt to local environmental conditions?
Paradoxical popups: Why are they hard to catch?
Creators: name: McBeath, Michael K.
name: Nathan, Alan M.
name: Bahill, A. Terry
name: Baldwin, David G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: Even professional baseball players occasionally find it difficult to gracefully approach seemingly routine pop-ups. This paper describes a set of towering pop-ups with trajectories that exhibit cusps and loops near the apex. For a normal fly ball, the horizontal velocity is continuously decreasing due to drag caused by air resistance. But for pop-ups, the Magnus force (the force due to the ball spinning in a moving airflow) is larger than the drag force. In these cases the horizontal velocity decreases in the beginning, like a normal fly ball, but after the apex, the Magnus force accelerates the horizontal motion. We refer to this class of pop-ups as paradoxical because they appear to misinform the typically robust optical control strategies used by fielders and lead to systematic vacillation in running paths, especially when a trajectory terminates near the fielder. In short, some of the dancing around when infielders pursue pop-ups can be well explained as a combination of bizarre trajectories and misguidance by the normally reliable optical control strategy, rather than apparent fielder error. Former major league infielders confirm that our model agrees with their experiences.
description: 28 pages, 10 figures, sumitted to American Journal of Physics
Το φαινόμενο του «Αυριανισμού». Λαϊκισμός και οι κρίσιμες εκλογές του 1985. Μάρτιος-Ιούνιος 1985.
Creators: name: Λανδρίτσης, Σπυρίδων Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Αυριανή
Λαϊκισμός
Πολιτική Επικοινωνία
Press of Avriani
Populism
Political Communication

description: Σκοπός της παρούσας διατριβής ήταν η μελέτη του φαινομένου του «Αυριανισμού» και συγκεκριμένα η αρραγής σχέση λαϊκισμού-«Αυριανισμού», όπως αυτή αποτυπώθηκε με τον πιο εναργή τρόπο μέσα από τα καθημερινά φύλλα της εφημερίδας, την περίοδο από τον Μάρτιο έως και τον Ιούνιο του 1985. Εξετάσαμε την ορολογία που χρησιμοποιείται για την οροθέτηση του λαϊκιστικού φαινομένου και τις κριτικές προσεγγίσεις γύρω από την αμφίσημη αυτή έννοια. Στην συνέχεια, προχωρήσαμε στην ανάλυση της πολιτικής επικοινωνίας και στην λειτουργία του Τύπου, ενώ αποπειραθήκαμε να ορίσουμε τον «μιντιακό» λαϊκισμό. Το κυρίαρχο όμως ερώτημα που αποτέλεσε και το εμπειρικό μας κομμάτι, ήταν η παράθεση όλων των λαϊκιστικών στοιχείων, γύρω από τα οποία περιστρεφόταν η εφημερίδα. Ένας άκρατος λαϊκισμός, διαπομπεύοντας και στιγματίζοντας τους πάντες. Τέλος, ασχοληθήκαμε με έννοιες γύρω από τον εθνοτικό ρατσισμό, τον αντισημιτισμό αλλά και τη συνωμοσιολογική κοσμοθεώρηση, στοιχεία τα οποία έρχονταν προς επίρρωση του λαϊκιστικού ύφους της Αυριανής.
description: The aim of the present thesis was the study of the phenomenon of «Press of Avriani». Namely, we explore the indissoluble connection of populism-«Press of Avriani» before the national elections of 1985 (March-June). Specifically, taking into account the main theories about populism and media populism, we examine the populist characteristics of its discourse. Finally, based on the approach about the relationship between populism and other phenomenon, such as national racism, anti-Semitism and conspiracy theories, we analyze these concepts which came to reinforce the populist discourse of Press Avriani.
Spectral Singularities with Directional Sensitivity
Creators: name: Ramezani, Hamidreza
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We propose a class of spectral singularities that are sensitive to the direction of excitation and are arising in nonlinear systems with broken parity symmetry. These spectral singularities are sensitive to the direction of the incident beam and result in diverging transmission and reflection for the left (right) incident while the transmission and reflection of the right (left) side of the system remain finite. For pedagogical reason first, we review the scattering formalism in nonlinear systems using an abstract delta-function model. Then using a parity symmetry broken nonlinear system consists of two delta functions, one linear and the other nonlinear, we show the existence of our proposed spectral singularities. Then, we use an experimentally feasible realistic model based on coupled disk resonators and we identify the spectral singularity with directional sensitivity (SSDS). Our proposed SSDS might have applications in designing nonlinear sensors. Furthermore, it can provide a solution for the hole burning problem in pumped laser cavities.
Δημιουργία λογισμικού για την εξαγωγή πλοηγήσιμων UAS περιοχών με χρήση του αλγόριθμου TACET
Creators: name: Ζωγραφιστός, Δημήτριος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Μη επανδρωμένα αεροσκάφη
Αλγόριθμος μετατροπής ψηφιδωτών δεδομένων
TACET
UAV
Raster to Vector Algorithm

description: Τα μη επανδρωμένα αεροσκάφη αποτελούν πλέον αναπόσπαστο κομμάτι πολλών εφαρμογών. Στην παρούσα διατριβή, και συγκεκριμένα στο κεφάλαιο 1 γίνεται μία σύντομη καταγραφή των συνηθέστερων εφαρμογών όπου χρησιμοποιούνται τέτοια συστήματα καθώς και των βασικών όρων που τα περιγράφουν. Στο κεφάλαιο 2, γίνεται μία παρουσίαση των προσπαθειών που πραγματοποιούνται για την καθιέρωση προτύπων πτήσης. Ιδιαίτερη έμφαση δίδεται στο επίγειο τμήμα των συστημάτων αυτών και ειδικότερα της πλοήγησής και του σχεδιασμού των ποριών τους στο χώρο. Παρουσιάζονται οι βασικότεροι τρόποι προσέγγισης του προβλήματος και αναφέρονται τα βασικά χαρακτηριστικά των αλγορίθμων που καλούνται να το επιλύσουν σε κάθε περίπτωση. Βασικό χαρακτηριστικό σε όλες τις περιπτώσεις προσέγγισης του προβλήματος αποτελεί ο σαφής και ο κατά το δυνατόν ακριβέστερος τρόπος προσδιορισμού των πιθανών εμποδίων στο χώρο πτήσης των αεροσκαφών (κεφάλαιο 5). Για το λόγο αυτό δημιουργήθηκε μία βιβλιοθήκη εξαγωγής μη πλοηγίσιμων περιοχών (εμποδίων) από ψηφιακά μοντέλα εδάφους (Digital Terrain Model) σε γλώσσα προγραμματισμού Java (κεφάλαιο 7). Το όνομα του αλγορίθμου που χρησιμοποιήθηκε είναι TACET (Two Arm Chain Edge Tracing) και αναλύεται πλήρως στο κεφάλαιο 6. Στο τέλος της εργασίας, στο κεφάλαιο 8 της εργασίας παρουσιάζεται μία απλή εφαρμογή εξαγωγής μη πλοηγήσιμων περιοχών η οποία ονομάστηκε UNAE (UAS Non-navigable Area Extractor) και η οποία κάνει χρήση της βιβλιοθήκης αυτής.
description: Unmanned Aircraft Vehicles (UAV) have become an integral part of many applications. This tendency has led to an increase in research and development of more sophisticated systems and technologies. At the same time, studies are continuously being carried out aiming at the integration of unmanned aircraft in regular air traffic. In this thesis, Chapter 1, gives a short list of the most common applications which use such systems and the basic terms describing them. Chapter 2 presents an extensive overview of the efforts made to establish standards for such systems. Particular emphasis is placed on the ground part of these systems and particularly the navigation and route planning aspects. We present the main ways to approach the problem and the essential characteristics of the algorithms that are used to solve it in each case. A key feature in all cases of approaching the problem is the need of a clear and precise way of identifying possible obstacles in the aircraft’s vicinity (Chapter 5). For this reason, a Java external library was created that exports the non-navigable areas (obstacles) given raster digital terrain models as input (Chapter 7). The name of the method used by this library is TACET (Two Arm Chain Edge Tracing) and it is fully analyzed in Chapter 6. Finally, in Chapter 8, a simple application to extract non-navigable areas which named UNAE (UAS Non-navigable
Bericht zur Tagung "Zeit-Szenen, Zeit Krisen. Zur Literatur der Annette von Droste-Hülshoff und der ›Biedermeier‹-Epoche"
Creators: name: Grunert, Christin
Publisher: name: KULT_online
Year: 2011

description: _
description: KULT_online, Nr. 28 (2011): KULT_online 28 (2011)
Η διπλή εκδοχή του έρωτος στον Πλωτίνο
Creators: name: Τερμεντζόγλου, Γεώργιος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Έρωτας
Πλωτίνος
Αφροδίτη
Love
Plotinus
Aphrodite

description: Η παρούσα εργασία αναλύει τον Έρωτα, με τον τρόπο που τον αντιλαμβάνεται ο Νεοπλατωνικός φιλόσοφος Πλωτίνος, ο οποίος έχει ως σταθερό άξονα αναφοράς το «Συμπόσιο» του Πλάτωνος και ιδιαίτερα τον μύθο της Διοτίμας που αφηγείται ο Σωκράτης. Ο Ἐρωτας παρουσιάζεται με δύο εκδοχές, την πάνδημη και τη θεϊκή σε απόλυτη συνάρτηση με τη φύση της Αφροδίτης. Στην πρώτη, πάνδημη, εκδοχή, η Αφροδίτη παρουσιάζεται ως κόρη του Δία και της Διώνης, στα γενέθλια της οποίας, σε γιορτινό τραπέζι στον Όλυμπο, γίνεται η σύλληψη του έρωτος. Ὁ έρωτας της πανδήμου εκδοχής, θεωρείται δαίμων, δηλαδή, μεταξύ του Θεϊκού στοιχείου και των ανθρώπων και δρα διαμεσολαβητικά ανάμεσα στους δύο κόσμους, νοητό και αισθητό. Στην θεϊκή εκδοχή, ο Έρωτας παρουσιάζεται ως Θεός και υιός της Ουράνιας αμήτωρος Αφροδίτης. Το συμπέρασμα της εργασίας είναι πως ο έρωτας αποτελεί πόθο αθανασίας.
description: The present study analyses Love in the way perceived by the Neoplatonic philosopher Plotinos, who uses Plato’s symposium as a constant frame of reference and particularly Diotimas’ myth narrated by Socrates. Love presents itself in two versions, human and divine in direct connection with Aphrodite’s nature. In the first human version, Aphrodite presents herself as Zeus’ and Dioni’s daughter and on the latter’s birthday love is conceived during a feast. Love in its human version is considered demonic that is to say between the divine element and humans and acts as mediation between the two worlds, the perceptible one and the tangible one. In its divine version, Love presents itself as God and son of Heavenly and motherless Aphrodite. The conclusion of the present study is that love constitutes a lust for immortality