cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
PRESUPPOSITIONAL FEATURES OF IN LEXICAL UNITS USED IN A TEXT
Creators: name: Ashirov Odilbek Makhsudovich Teacher at the Department of Uzbek Lingusitics, Karakalpak State University named after Berdak
name: Allambergenova Maftuna Student of Karakalpak State University
Publisher: name: Zenodo
Year: 2023

description: The article addresses contemporary linguistic issues, with a specific focus on the phenomenon of presupposition and its integration into Uzbek linguistics as a nascent field. The examination extends to the utilization of lexical units associated with presupposition within the realm of pragmatics in literary works. The significance of presupposition-forming tools is underscored, particularly in the context of literary endeavors where their characteristics are more distinctly delineated.

Key words: pragmatics, presupposition, metaphor, phonopragmatic implicature, metaphorical implicature, implicit, explicit, synonymous sequence, paralinguistic
Non-Markovian Decay and Lasing Condition in an Optical Microcavity Coupled to a Structured Reservoir
Creators: name: Longhi, Stefano
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The decay dynamics of the classical electromagnetic field in a leaky optical resonator supporting a single mode coupled to a structured continuum of modes (reservoir) is theoretically investigated, and the issue of threshold condition for lasing in presence of an inverted medium is comprehensively addressed. Specific analytical results are given for a single-mode microcavity resonantly coupled to a coupled resonator optical waveguide (CROW), which supports a band of continuous modes acting as decay channels. For weak coupling, the usual exponential Weisskopf-Wigner (Markovian) decay of the field in the bare resonator is found, and the threshold for lasing increases linearly with the coupling strength. As the coupling between the microcavity and the structured reservoir increases, the field decay in the passive cavity shows non exponential features, and correspondingly the threshold for lasing ceases to increase, reaching a maximum and then starting to decrease as the coupling strength is further increased. A singular behavior for the "laser phase transition", which is a clear signature of strong non-Markovian dynamics, is found at critical values of the coupling between the microcavity and the reservoir.
description: to appear in Phys. Rev. A (December 2006 issue)
Universal flapping states of elastic fibers in modulated turbulence
Creators: name: Olivieri, Stefano
name: Mazzino, Andrea
name: Rosti, Marco E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We study the fully-coupled dynamics between a fully-developed turbulent flow and an ensemble of immersed flexible fibers. We vary the concentration of the suspension, the mechanical properties and the length of the fibers in a vast parametric range. For all configurations, the fiber dynamics falls in only two possible dynamical states: (i) the fiber manifests its natural response to the flow forcing or (ii) its motion fully synchronizes to the hydrodynamic timescales of the turbulent flow. This scenario holds for both a dilute condition, where the carrier flow is not affected by the fluid-structure interaction, as well as in the case where the flow is substantially altered by the presence of the immersed objects. Such backreaction effect can be macroscopically modelled in terms of the mass fraction of the suspension. Our results can be readily extended to any elastic objects interacting with fluid turbulence.
Foamed electrolyte in flow-by fixed-bed electrodes : study of fluid dynamics & transport processes
Creators: name: Mohandes, Abdolhosein
Publisher: name: University of British Columbia
Year: 2009

description: Experiments were carried out in bench scale electrochemical packed-bed cells to study the “fluid dynamics and transport processes” with upward flow-by foamed electrolyte.In this context, the pressure gradient, liquid holdup, axial liquid dispersion coef- ficient, flowing foam electric conductivity, and overall mass transfer capacity were measured in packed rectangular cells. All the runs were conducted at 22 degree Celsius inlet foam temperature. The cells were packed with graphite fiber felt (comprised of 20 micron diameter fibers) and the liquid phase of the flowing foam was composed of water (for dispersion experiments) and 1 N NaOH solution (for all other experiments) with 0.1 % v/v surfactant, Tergitol. The gas phase of the foam was oxygen for mass transfer experiments and nitrogen for all other experiments. The studies were performed with respect to the three independent variables of bed porosity (at three levels, except for the mass transfer measurements which were done at two levels), liquid load and gas load (at numerous levels). Empirical second order correlations including interaction terms were developed for each parameter, in terms of the three independent variables. The overall results are summarized as follows: I - Absolute value of the pressure gradient ranged from 20 to 80 bar.m⁻¹ , and is a factor of 50-100 higher than in nonfoaming systems with similar fluid loads. II - Liquid holdup ranged from 7 to 20 %, which is lower than the minimum of about 40 % observed in nonfoaming systems at similar fluid loads. III - Axial dispersion coefficient ranged from 0.01 to 0.46 cm².s⁻¹, which is below prev- iously reported values of packed bed processors with nonfoaming liquids. IV - The flowing foam effective electric conductivity ranged from 6.8 to 11.1 mho.m⁻¹, which is equivalent to the effective electrolyte conductivity in nonfoaming gas/liquid flow at 3 to 5 times the liquid holdup, as estimated by the Neale and Nader correlation. V - Overall mass transfer capacity ranged from 4.7 to 7.6 s⁻¹ which is a factor of 1.8 times the values in similar nonfoaming systems, assuming the total bed is electrochemi- cally active. Apart from the high pressure gradient, the graphite fiber packed-bed cell with foamed electrolyte shows promising performance for electrochemical processing involving gaseous reactants.
Direct Observation of A Large-scale CME Flux Rope Event Arising from an Unwinding Coronal Jet
Creators: name: Chen, Hechao
name: Yang, Jiayan
name: Hong, Junchao
name: Li, Haidong
name: Duan, Yadan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Coronal mass ejections (CMEs) and coronal jets are two types of common solar eruptive phenomena, which often independently happen at different spatial scales. In this work, we present a stereoscopic observation of a large-scale CME flux rope arising from an unwinding blowout jet in a multipolar complex magnetic system. Based on a multi-band observational analysis, we find that this whole event starts with a small filament whose eruption occurs at a coronal geyser site after a series of homologous jets. Aided by magnetic field extrapolations, it reveals that the coronal geyser site forms above an elongate opposite-polarity interface, where the emergence-driven photospheric flux cancellation and repetitive reconnection are responsible for those preceding recurrent jets and also contribute to the ultimate filament destabilization. By interacting with overlying fields, the erupting filament breaks one of its legs and results in an unwinding blowout jet. Our estimation suggests that around 1.4$-$2.0 turns of twist release in its jet spire. This prominent twist transport in jet spire rapidly creates a newborn larger-scale flux rope from the jet base to a remote site. Soon after its formation, this large-scale flux rope erupts towards the outer coronae causing an Earth-directed CME. In its source region, two sets of distinct post-flare loops form in succession, indicating this eruption involves two-stage of flare magnetic reconnection. This work not only reveals a real magnetic coupling process between different eruptive activities but provides a new hint for understanding the creation of large-scale CME flux ropes during the solar eruption.
description: Accepted in February 10, 2021 Submitted to ApJ
The Radial Excited Heavy Mesons
Creators: name: Chen, Muyang
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this paper, the first radial excited heavy pseudoscalar and vector mesons ($η_c(2S)$, $ψ(2S)$, $B_c(2S)$, $B^*_c(2S)$, $η_b(2S)$, $\varUpsilon(2S)$) are studied in the Dyson-Schwinger equation and Bethe-Salpeter equation approach. It is showed that the effective interactions of the radial excited states are harder than that of the ground states. With the interaction well determined by fitting the masses and leptonic decay constants of $ψ(2S)$ and $\varUpsilon(2S)$, the first radial excited heavy mesons could be quantitatively described in the rainbow ladder approximation. The masses and leptonic decay constants of $η_c(2S)$, $B_c(2S)$, $B^*_c(2S)$ and $η_b(2S)$ are predicted.
description: 10 pages, 2 figures, 2 tables
Stationarity and geometric ergodicity of a class of nonlinear ARCH models
Creators: name: Sa\"{ı}di, Youssef
name: Zako\"{ı}an, Jean-Michel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G10, 60J05 (Primary) 62M10, 91B84 (Secondary)

description: A class of nonlinear ARCH processes is introduced and studied. The existence of a strictly stationary and $β$-mixing solution is established under a mild assumption on the density of the underlying independent process. We give sufficient conditions for the existence of moments. The analysis relies on Markov chain theory. The model generalizes some important features of standard ARCH models and is amenable to further analysis.
description: Published at http://dx.doi.org/10.1214/105051606000000565 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Σημειωτικές αντιθέσεις στις ιαπωνικές ταινίες animation.Μελέτη περίπτωσης: Η κινηματογραφική μεταφορά του ιαπωνικού μύθου Taketori monogatari στην ταινία the tale of the princess Kaguya
Creators: name: Ψωμιάδου, Ειρήνη Χαραλάμπους
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Σημειωτική
Κινηματογράφος
Ιαπωνία
Semiotics
Animation
Japan

description: Το αντικείμενο μελέτης της παρούσας διπλωματικής εργασίας είναι η ταινία animation του Studio Ghibli, The tale of the princess Kaguya. Σκοπός της είναι η μελέτη των σημειωτικών αντιθέσεων, όπως προκύπτουν κατά από τη διάρκεια της ταινίας. Σε θεωρητικό πλαίσιο, η εργασία ασχολείται με τη σημειωτική και την αφήγηση στον κινηματογράφο. Στη συνέχεια, γίνεται μια σύντομη αναδρομή της ιστορίας των ιαπωνικών ταινιών animation, καθώς και παρατίθενται πληροφοριακά στοιχεία που αφορούν τους δημιουργούς της ταινίας. Έπειτα, αναφέρεται το κοινωνικό και πολιτισμικό πλαίσιο δράσης του animation και συγκεκριμένα ήθη και παραδόσεις κατά την ιαπωνική περίοδο Χεϊάν. Στη συνέχεια, χωρίζονται νοηματικά οι ενότητες της ταινίας. Από αυτόν το διαχωρισμό, προκύπτουν ισοτοπίες, τις οποίες στη συνέχεια αναλύουμε, χρησιμοποιώντας ως μεθοδολογικό εργαλείο τη σημειωτική. Από την ανάλυση αυτή διαπιστώθηκαν αντιθετικές σχέσεις, κυρίως στα επίπεδα χώρου και κοινωνίας, ενώ παράλληλα παρατηρήθηκαν αντιθέσεις που προέκυψαν από την τεχνοτροπία της ταινίας αλλά και από γλωσσικούς κώδικες.
description: The main objective of this thesis is the animated, Studio Ghibli, film The tale of the princess Kaguya. The aim is to study the semiotic contrasts, derived over the course of the film. In a theoretical framework, the thesis deals with the narration in cinema and general film semiotics. Then, a brief overview of the history of Japanese animated films is discussed, while information on the film's creators is provided. We refer to the social and cultural framework of the movie and more specifically, that of customs and traditions, during the Japanese Heian period. Thereupon, the film sections are separated by concept. This separation results in different semantic isotopies which are later analyzed, using semiotics as methodology. The analysis revealed contrasting liaisons, mainly in the levels of space and society, whilst we observed antithetic relations arising, not only from the movie style but also from linguistic codes.
Decreasing excitation gap in Andreev billiards by disorder scattering
Creators: name: Libisch, Florian
name: Möller, Jürgen
name: Rotter, Stefan
name: Vavilov, Maxim G.
name: Burgdörfer, Joachim
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate the distribution of the lowest-lying energy states in a disordered Andreev billiard by solving the Bogoliubov-de Gennes equation numerically. Contrary to conventional predictions we find a decrease rather than an increase of the excitation gap relative to its clean ballistic limit. We relate this finding to the eigenvalue spectrum of the Wigner-Smith time delay matrix between successive Andreev reflections. We show that the longest rather than the mean time delay determines the size of the excitation gap. With increasing disorder strength the values of the longest delay times increase, thereby, in turn, reducing the excitation gap.
description: 6 pages, 5 figures, submitted to EPL
A SAMI and MaNGA view on the stellar kinematics of galaxies on the star-forming main sequence
Creators: name: Fraser-McKelvie, A.
name: Cortese, L.
name: van de Sande, J.
name: Bryant, J. J.
name: Catinella, B.
name: Colless, M.
name: Croom, S. M.
name: Groves, B.
name: Medling, A. M.
name: Scott, N.
name: Sweet, S. M.
name: Bland-Hawthorn, J.
name: Goodwin, M.
name: Lawrence, J.
name: Lorente, N.
name: Owers, M. S.
name: Richards, S. N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Galaxy internal structure growth has long been accused of inhibiting star formation in disc galaxies. We investigate the potential physical connection between the growth of dispersion-supported stellar structures (e.g. classical bulges) and the position of galaxies on the star-forming main sequence at $z\sim0$. Combining the might of the SAMI and MaNGA galaxy surveys, we measure the $λ_{Re}$ spin parameter for 3781 galaxies over $9.5 < \log M_{\star} [\rm{M}_{\odot}] < 12$. At all stellar masses, galaxies at the locus of the main sequence possess $λ_{Re}$ values indicative of intrinsically flattened discs. However, above $\log M_{\star}[\rm{M}_{\odot}]\sim10.5$ where the main sequence starts bending, we find tantalising evidence for an increase in the number of galaxies with dispersion-supported structures, perhaps suggesting a connection between bulges and the bending of the main sequence. Moving above the main sequence, we see no evidence of any change in the typical spin parameter in galaxies once gravitationally-interacting systems are excluded from the sample. Similarly, up to 1 dex below the main sequence, $λ_{Re}$ remains roughly constant and only at very high stellar masses ($\log M_{\star}[\rm{M}_{\odot}]>11$), do we see a rapid decrease in $λ_{Re}$ once galaxies decline in star formation activity. If this trend is confirmed, it would be indicative of different quenching mechanisms acting on high- and low-mass galaxies. The results suggest that while a population of galaxies possessing some dispersion-supported structure is already present on the star-forming main sequence, further growth would be required after the galaxy has quenched to match the kinematic properties observed in passive galaxies at $z\sim0$.
description: 16 pages, 10 figures, accepted for publication in MNRAS
Effects of three-baryon forces on kaon condensation in hyperon-mixed matter
Creators: name: Muto, Takumi
name: Maruyama, Toshiki
name: Tatsumi, Toshitaka
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Possibility of kaon-condensed phase in hyperon-mixed matter is considered on the basis of chiral symmetry for kaon-baryon and kaon-kaon interactions, being combined with the relativistic mean-field theory for two-body baryon interaction. In addition, universal three-baryon repulsive force in the string-junction model and phenomenological three-nucleon attractive force are introduced. It is shown that softening of the equation of state stemming from both kaon condensation and mixing of hyperons is compensated with the repulsive effect of the three-baryon force and the relativistic effect for two-body baryon-baryon interaction. The latter effect reflects the density-dependence of scalar and vector meson mean-fields, which is constrained by the contribution of the attractive three-nucleon force to the binding energy at saturation density. The kaon-condensed phase in hyperon-mixed matter becomes stiff enough to be consistent with recent observations of massive neutron stars.
description: 6 pages, 3 figures Some sentences and related references are added
Study of the topological Hall effect on simple models
Creators: name: Metalidis, G.
name: Bruno, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Recently, a chirality-driven contribution to the anomalous Hall effect has been found that is induced by the Berry phase and does not directly involve spin-orbit coupling. In this paper, we will investigate this effect numerically in a two-dimensional electron gas with a simple magnetic texture model. Both the adiabatic and non-adiabatic regimes are studied, including the effect of disorder. By studying the transition between both regimes the discussion about the correct adiabaticity criterium in the diffusive limit is clarified.
description: 8 pages, 7 figures, revtex4
Dust and Atomic Gas in Dwarf Irregular Galaxies of the M81 Group: The SINGS and THINGS view
Creators: name: Walter, F.
name: Cannon, J.
name: Roussel, H.
name: Bendo, G.
name: Calzetti, D.
name: Dale, D.
name: Draine, B.
name: Helou, G.
name: Kennicutt, R.
name: Moustakas, J.
name: Rieke, G.
name: Armus, L.
name: Engelbracht, C.
name: Gordon, K.
name: Hollenbach, D.
name: Lee, J.
name: Li, A.
name: Meyer, M.
name: Murphy, E.
name: Regan, M.
name: Smith, J. D.
name: Brinks, E.
name: de Blok, W. J. G.
name: Bigiel, F.
name: Thornley, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: [abridged] We present observations of the dust and atomic gas phase in seven dwarf irregular galaxies of the M81 group from the SINGS and THINGS surveys. The Spitzer observations provide a first glimpse of the nature of the non-atomic ISM in these metal-poor (Z~0.1 Z_sun), quiescent (SFR~0.001-0.1 M_sun/yr) dwarf galaxies. Dust emission is detected in five out of the seven targets. Most detected dust emission is restricted to HI column densities >1x10^21 cm^-2. Spitzer spectroscopy of two regions in the brightest galaxies (IC 2574 and Holmberg II) show distinctly different spectral shapes. The spectrum of IC 2574 shows aromatic features that are less luminous (relative to the FIR luminosity) compared to an average SINGS spiral galaxy by a factor of \~7 . The aromatic features in Holmberg~II (which has only a slightly lower gas-phase metallicity) are fainter than in IC 2574 by an order of magnitude. This result emphazises that the strength of the aromatic features is not a simple linear function of metallicity. We estimate dust masses of ~10^4-10^6 M_sun for the M81 dwarf galaxies, resulting in an average dust--to--gas ratio (M_dust/M_HI) of ~3x10^-4 (1.5x10^-3 if only the HI that is associated with dust emission is considered); this is an order of magnitude lower than the typical value derived for the SINGS spirals. The dwarf galaxies are underluminous per unit star formation rate at 70um as compared to the more massive galaxies in SINGS by a factor of ~2. However, the average 70um/160um ratio in the sample dwarf galaxies is higher than what is found in the other galaxies of the SINGS sample. This can be explained by a combination of a lower dust content in conjunction with a higher dust temperature in the dwarfs.
description: Accepted for publication in the Astrohysical Journal. High resolution version available at: http://www.mpia.de/homes/walter/preprint_walter_highres.pdf
Macrolides : chemistry and progress towards a catalytic antibody
Creators: name: Spracklin, Douglas K.
Publisher: name: University of British Columbia
Year: 2009

description: As part of a continuing study examining the chemistry and conformational behaviour of keto 13-tetradecanolides, 11 -oxo- 13-tetradecanolide (24) was synthesized. In the preparation of the acyclic precursor, optimal yields were obtained when the C-11 ketone was protected until the macrocyclic ring had been formed. Otherwise, a protected β-hydroxy group was eliminated under both acidic and basic conditions. The cyclization was accomplished via a trichlorobenzoyl chloride intermediate. Reduction of 24 using lithium tri-sec-butylborohydride (L-Selectride) gave the (11R* , 13S*)isomer of 49 in >99.8% diastereoselectivity. The relative stereochemistry of 49 was determined by reduction and conversion of the 1,3-diol to an acetonide for ¹³C NMR analysis. Molecular mechanics calculations were used to determine the possible low energy conformations for compounds 24 and 49. Reduction of 24 from the preferred twist [3434] conformations would be expected to give rise to product 49 as is indeed observed. The calculations also predicted ¹H NMR coupling constants in good agreement with the observed values for both 24 and 49. [chemical compound diagrams] As part of an effort to develop a catalytic antibody for the synthesis of macrocyclic lactones, polyclonal antibodies against the phosphonate hapten 130 were raised. These antibodies demonstrated hapten-specific binding, but they did not catalyze the lactonization of a corresponding hydroxy ester substrate under the conditions examined. [chemical compound diagrams]
On closures for reduced order models $-$ A spectrum of first-principle to machine-learned avenues
Creators: name: Ahmed, Shady E.
name: Pawar, Suraj
name: San, Omer
name: Rasheed, Adil
name: Iliescu, Traian
name: Noack, Bernd R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Dynamical Systems (math.DS)
subject: Computational Physics (physics.comp-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: For over a century, reduced order models (ROMs) have been a fundamental discipline of theoretical fluid mechanics. Early examples include Galerkin models inspired by the Orr-Sommerfeld stability equation and numerous vortex models, of which the von Kármán vortex street is one of the most prominent. Subsequent ROMs typically relied on first principles, like mathematical Galerkin models, weakly nonlinear stability theory, and two- and three-dimensional vortex models. Aubry et al. [N. Aubry, P. Holmes, J. Lumley, and E. Stone, Journal of Fluid Mechanics, 192, 115-173 (1988)] pioneered data-driven proper orthogonal decomposition (POD) modeling. In early POD modeling, available data was used to build an optimal basis, which was then utilized in a classical Galerkin procedure to construct the ROM. But data has made a profound impact on ROMs beyond the Galerkin expansion. In this paper, we take a modest step and illustrate the impact of data-driven modeling on one significant ROM area. Specifically, we focus on ROM closures, which are correction terms that are added to classical ROMs in order to model the effect of the discarded ROM modes in under-resolved simulations. Through simple examples, we illustrate the main modeling principles used to construct classical ROMs, motivate and introduce modern ROM closures, and show how data-driven modeling, artificial intelligence, and machine learning have changed the standard ROM methodology over the last two decades. Finally, we outline our vision on how state-of-the-art data-driven modeling can continue to reshape the field of reduced order modeling.
Optimization of production lines
Creators: name: Παναγιωτοπούλου, Άννα-Μαρία Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Γραμμή παραγωγής
Βελτιστοποίηση
Βιομηχανικά συστήματα
Production line
Optimization
Manufacturing systems

description: This master thesis focuses on the subject of production line optimization. It can be divided into two parts. The first part is composed by several theoretical aspects related to the problem, which have been developed in different time periods by different authors. Yet, the biggest part of the research has been conducted since the 1980s. The second part is composed by an example of application of production line optimization Some production lines included in this example have parallel-machine workstations, while some other have single-machine workstations. Three different problems are optimized for similar data: the Server Allocation Problem (SAP), the Buffer Allocation Problem (BAP), and the Workload Allocation Problem (WAP). The optimization results of each problem are extracted through a computer program named prodline-1.1.exe. In the end of the second part, the optimization results of each problem and results of other related variables (time and line throughput) are presented graphically. Finally, results of all the different problems are compared and contrasted.
description: Αυτή η διπλωματική εργασία εστιάζει στη βελτιστοποίηση των γραμμών παραγωγής. Η εργασία διαιρείται σε δύο μέρη. Το πρώτο μέρος αποτελείται από διάφορες θεωρητικές προσεγγίσεις του προβλήματος, οι οποίες αναπτύχθηκαν σε διαφορετικές χρονικές περιόδους από διαφορετικούς ερευνητές. Ωστόσο, το μεγαλύτερο μέρος της έρευνας διεξήχθη από τη δεκαετία του 1980 και μετά. Το δεύτερο μέρος της εργασίας αποτελείται από ένα παράδειγμα της εφαρμογής της βελτιστοποίησης γραμμών παραγωγής. Κάποιες από τις γραμμές παραγωγής του παραδείγματος έχουν σταθμούς επεξεργασίας με παράλληλες μηχανές, ενώ κάποιες άλλες έχουν σταθμούς επεξεργασίας με μία μηχανή ο καθένας. Τρία διαφορετικά προβλήματα βελτιστοποιούνται, κρατώντας τα υπόλοιπα δεδομένα παρόμοια σε όλα τα προβλήματα: το πρόβλημα του επιμερισμού των μηχανών στους σταθμούς επεξεργασίας, το πρόβλημα του επιμερισμού των αποθηκευτικών χώρων και το πρόβλημα του επιμερισμού του φόρτου εργασίας. Τα αποτελέσματα της βελτιστοποίησης κάθε προβλήματος προκύπτουν μέσω του ηλεκτρονικού προγράμματος prodline-1.1.exe. Στο τέλος του δεύτερου μέρους, τα αποτελέσματα της βελτιστοποίησης κάθε προβλήματος και άλλων σχετικών μεταβλητών (χρόνος και απόδοση της γραμμής) παρουσιάζονται γραφικά. Τελικά, τα αποτελέσματα των διαφόρων προβλημάτων συγκρίνονται μεταξύ τους.
The Growth of Protoplanets via the Accretion of Small Bodies in Disks Perturbed by the Planetary Gravity
Creators: name: Okamura, Tatsuya
name: Kobayashi, Hiroshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Planets grow via the collisional accretion of small bodies in a protoplanetary disk. Such small bodies feel strong gas drag and their orbits are significantly affected by the gas flow and atmospheric structure around the planet. We investigate the gas flow in the protoplanetary disk perturbed by the gravity of the planet by three-dimensional hydrodynamic simulation. We then calculate the orbital evolutions of particles in the gas structure obtained from the hydrodynamic simulation. Based on the orbital calculations, we obtain the collision rate between the planet and centimeter to kilometer sized particles. Our results show that meter-sized or larger particles effectively collide with the planet due to the atmospheric gas drag, which significantly enhances the collision rate. On the other hand, the gas flow plays an important role for smaller particles. Finally, considering the effects of the atmosphere and gas flow, we derive the new analytic formula for the collision rate, which is in good agreement with our simulations. We estimate the growth timescale and accretion efficiency of drifting bodies for the formation of a gas-giant solid core using the formula. We find the accretion of sub-kilometer sized bodies achieve a short growth timescale (~0.005 Myr) and a high accretion efficiency (~1) for the core formation at 5 au in the minimum mass solar nebula model.
description: Accepted for publication in The Astrophysical Journal
Collisionless energy absorption in the short-pulse intense laser-cluster interaction
Creators: name: Kundu, M.
name: Bauer, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: In a previous Letter [Phys. Rev. Lett. 96, 123401 (2006)] we have shown by means of three-dimensional particle-in-cell simulations and a simple rigid-sphere model that nonlinear resonance absorption is the dominant collisionless absorption mechanism in the intense, short-pulse laser cluster interaction. In this paper we present a more detailed account of the matter. In particular we show that the absorption efficiency is almost independent of the laser polarization. In the rigid-sphere model, the absorbed energy increases by many orders of magnitude at a certain threshold laser intensity. The particle-in-cell results display maximum fractional absorption around the same intensity. We calculate the threshold intensity and show that it is underestimated by the common over-barrier ionization estimate.
description: 12 pages, 13 figures, RevTeX4
Ανάπτυξη δεξιοτήτων στη γραπτή διαμεσολάβηση: Μελέτη περίπτωσης σε ελληνόφωνους και αλλόφωνους μαθητές
Creators: name: Μπαλίτα, Θεοφανούλα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: ΚΠΓ
Γραπτή διαμεσολάβηση
Σώματα Κειμένων Μαθητών
KPG
Written mediation
Learner Corpora

description: Σκοπός της έρευνας ήταν η μελέτη της παραγωγής γραπτού λόγου, η οποία αποτελεί μία από τις δεξιότητες που ελέγχονται στις εξετάσεις του Κρατικού Πιστοποιητικού Γλωσσομάθειας (ΚΠΓ) και συνίσταται σε δύο παραγωγές με δύο διαφορετικά κείμενα εφόρμησης, ένα στην αγγλική και ένα στην ελληνική γλώσσα. Η δεύτερη παραγωγή ελέγχει τη διαμεσολαβητική ικανότητα, η οποία αποτελεί το καινοτόμο χαρακτηριστικό του ΚΠΓ. Εξετάσαμε συγκριτικά τις δύο παραγωγές γραπτού λόγου, την ημιελεύθερη παραγωγή και τη διαμεσολάβηση, από ελληνόφωνους και αλλόφωνους μαθητές Επαγγελματικού Λυκείου. Για τις ανάγκες της έρευνας χρησιμοποιήσαμε Σώματα Κειμένων Μαθητών, τα οποία δημιουργήθηκαν από τις γραπτές παραγωγές στην Αγγλική των μαθητών επιπέδων Β1 και Β2. Στη συνέχεια παρουσιάσαμε αναλυτικά τη συγκριτική μελέτη, η οποία έλαβε υπόψη το συνολικό προφίλ των μαθητών και βασίστηκε σε τρεις μεταβλητές, τη λεξιλογική πυκνότητα, τη λεξιλογική ποικιλία και τη χρήση κειμενικών δεικτών. Τα αποτελέσματα της έρευνας κατέδειξαν το γεγονός ότι η ανάπτυξη της διαμεσολαβητικής ικανότητας προϋποθέτει τη διδασκαλία και εκμάθηση τεχνικών και στρατηγικών οι οποίες θα βοηθήσουν τον μαθητή/υποψήφιο του ΚΠΓ να ανταποκριθεί με επιτυχία στις διαμεσολαβητικές δραστηριότητες.
description: In the present study we focused on the written production, which is one of the skills to be assessed in the exams of the State Certificate of Language Proficiency (nationally and internationally known as the KPG). The written production involves both writing and written mediation, based on English and Greek texts respectively and the latter stands for the innovative characteristic of the KPG exams. We presented the comparison between the writing and the written mediation of native Greek and non native Greek speaking students of a Vocational High School. The comparison was realized with the help of the Learner Corpora that we created from the written productions of the students in the English language, levels B1 and B2 and it was based on three variables, the lexical density, the lexical variation and the discourse markers. Furthermore, we analyzed the profile of the students and we also discussed about the necessity of the teaching of certain mediation strategies and techniques that could help the learner/candidate succeed in the mediation activities of the KPG.
Fast generation of mock galaxy catalogues in modified gravity models with COLA
Creators: name: Fiorini, Bartolomeo
name: Koyama, Kazuya
name: Izard, Albert
name: Winther, Hans A.
name: Wright, Bill S.
name: Li, Baojiu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the viability of producing galaxy mock catalogues with COmoving Lagrangian Acceleration (COLA) simulations in Modified Gravity (MG) models employing the Halo Occupation Distribution (HOD) formalism. In this work, we focus on two theories of MG: $f(R)$ gravity with the chameleon mechanism, and a braneworld model (nDGP) that incorporates the Vainshtein mechanism. We use a suite of full $N$-body simulations in MG as a benchmark to test the accuracy of COLA simulations. At the level of Dark Matter (DM), we show that COLA accurately reproduces the matter power spectrum up to $k \sim 1 h {\rm Mpc}^{-1}$, while it is less accurate in reproducing the velocity field. To produce halo catalogues, we find that the ROCKSTAR halo-finder does not perform well with COLA simulations. On the other hand, using a simple Friends-of-Friends (FoF) finder and an empirical mass conversion from FoF to spherical over-density masses, we are able to produce halo catalogues in COLA that are in good agreement with those in $N$-body simulations. To consider the effects of the MG fifth force on the halo profile, we derive simple fitting formulae for the concentration-mass and the velocity dispersion-mass relations that we calibrate using ROCKSTAR halo catalogues in $N$-body simulations. We then use these results to extend the HOD formalism to modified gravity simulations in COLA. We use an HOD model with five parameters that we tune to obtain galaxy catalogues in redshift space. We find that despite the great freedom of the HOD model, MG leaves characteristic imprints in the redshift space power spectrum multipoles and these features are well captured by the COLA galaxy catalogues.
description: 24 pages, 13 figures, Comments are welcome - Accepted for publication in JCAP
X-ray Emission of the $γ$-ray Loud Young Radio Galaxy NGC 3894
Creators: name: Balasubramaniam, K.
name: Stawarz, L .
name: Cheung, C. C.
name: Sobolewska, M.
name: Marchenko, V.
name: Thimmappa, R.
name: Krol, D. L.
name: Migliori, G.
name: Siemiginowska, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The radio source 1146+596 is hosted by an elliptical/S0 galaxy NGC\,3894, with a low-luminosity active nucleus. The radio structure is compact, suggesting a very young age of the jets in the system. Recently, the source has been confirmed as a high-energy (HE, $>0.1$\,GeV) $γ$-ray emitter, in the most recent accumulation of the {\it Fermi} Large Area Telescope (LAT) data. Here we report on the analysis of the archival {\it Chandra} X-ray Observatory data for the central part of the galaxy, consisting of a single 40\,ksec-long exposure. We have found that the core spectrum is best fitted by a combination of an ionized thermal plasma with the temperature of $\simeq 0.8$\,keV, and a moderately absorbed power-law component (photon index $Γ= 1.4\pm 0.4$, hydrogen column density $N_{\rm H}/10^{22}$\,cm$^{-2}$\,$= 2.4\pm 0.7$). We have also detected the iron K$α$ line at $6.5\pm 0.1$\,keV, with a large equivalent width of EW\,$= 1.0_{-0.5}^{+0.9}$\,keV. Based on the simulations of the {\it Chandra}'s Point Spread Function (PSF), we have concluded that, while the soft thermal component is extended on the scale of the galaxy host, the hard X-ray emission within the narrow photon energy range 6.0--7.0\,keV originates within the unresolved core (effectively the central kpc radius). The line is therefore indicative of the X-ray reflection from a cold neutral gas in the central regions of NGC\,3894. We discuss the implications of our findings in the context of the X-ray Baldwin effect. NGC\,3894 is the first young radio galaxy detected in HE $γ$-rays with the iron K$α$ line.
description: Revised version, accepted for publication in the Astrophysical Journal
Engineering Swarms of Cyber-Physical Systems with the CPSwarm Workbench
Creators: name: Sende, Micha
name: Schranz, Melanie
name: Prato, Gianluca
name: Brosse, Etienne
name: Morando, Omar
name: Umlauft, Martina
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multiagent Systems (cs.MA)
subject: FOS: Computer and information sciences
subject: 68T40

description: Engineering swarms of cyber-physical systems (CPSs) is a complex process. We present the CPSwarm workbench that creates an automated design workflow to ease this process. This formalized workflow guides the user from modeling, to code generation, to deployment, both in simulation and on CPS hardware platforms. The workbench combines existing and emerging tools to solve real-world CPS swarm problems. As a proof-of-concept, we use the workbench to design a swarm of unmanned aerial vehicles (UAVs) and unmanned ground vehicles (UGVs) for a search and rescue (SAR) use case. We evaluate the resulting swarm behaviors on three levels. First, abstract simulations for rapid prototyping. Second, detailed simulation to test the correctness of the results. Third, deployment on hardware to demonstrate the applicability. We measure the swarm performance in terms of area covered and victims rescued. The results show that the performance of the swarm is proportional to its size. Despite some manual steps, the proposed workbench shows to be well suited to ease the complicated task of deploying a swarm of CPSs.
Reactivity and structure of gas phase olefin-transition metal ions by Fourier transform ion cyclotron resonance mass spectrometry
Creators: name: Kan, Ziti
Publisher: name: University of British Columbia
Year: 2009

description: The gas phase ion-molecule chemistry of the following organometallic complexes has been examined using Fourier transform ion cyclotron resonance (Fr-ICR) mass spectrometric techniques. [Formula] Positive and negative fragment ions generated by electron impact ionization from each of the complexes were allowed to react with the neutral parent molecule or other selected neutral molecules. Monometallic ions typically reacted with the parent molecule to form multimetallic products such as(c-C₇H₈)Cr₂(CO)⁺,(c-C₇H₈)₂Cr₂(CO)₃⁺,(c-C₇H₈)₂Cr₃(CO)₂⁺and (c C₇H₈)3Cr₄(CO)₃⁺.The ion-molecule reaction pathways were determined by Fr-ICR multiple resonance ion ejection techniques. Abundances of ionic reactants and products were temporally monitored to obtain kinetic data. A general trend that ion reactivity towards the parent molecule increased with increasing electron deficiency on the metal atom was observed. Some ions exhibited unexpected reactivity patterns, despite their large formal electron deficiency, suggesting the presence of unusual bonding configurations in the ions. For complexes 1 to 3, positive fragment ions formed by losing all three CO groups showed anomalously low reactivities. These low reactivities were rationalized by a gas phase ion rearrangement in which a ß-hydride intramolecularly transferred from the olefin ligand to the metal center to yield a metal hydride ion with a less-electron-deficient central metal atom. The metal hydride ions were detected by a specific ion-molecule addition-dehydrogenation reaction with deuterated methanol that was discovered in this research. The addition-dehydrogenation reaction appeared to be a definitive test for metal-hydrogen bonding in gas phase organometallic ions as ions lacking metal-hydrogen bonds underwent either substitution reactions or adduct-formation reactions with methanol. The major driving forces for the 3- hydride transfer appeared to be the high degree of electron unsaturation at the metal center and the formation of aromatic or other highly delocalized organic ligands. The low observed reactivities of some ions from complex 4 were explained by a coordination expansion (ŋ⁴4 to ŋ ⁶) process that also lowered the electron deficiency on the Fe atom. In some of the substituted ferrocene systems, a ring expansion process was inferred. For the negative ion chemistry of complex 3, an a-proton transfer from the cyclohexadienone ligand to the negatively charged metal center (via ketone/enolate tautomerization) was suggested to explain the observed negative ion reactivities. The ion processes observed in this research are of importance for a better understanding of the mass spectra of organometallic complexes and inferentially for a better understanding of the mechanism of C-H and C-C bond activation by gas phase transition metal ions.
Computation of free energy profiles with parallel adaptive dynamics
Creators: name: Lelievre, Tony
name: Rousset, Mathias
name: Stoltz, Gabriel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We propose a formulation of adaptive computation of free energy differences, in the ABF or nonequilibrium metadynamics spirit, using conditional distributions of samples of configurations which evolve in time. This allows to present a truly unifying framework for these methods, and to prove convergence results for certain classes of algorithms. From a numerical viewpoint, a parallel implementation of these methods is very natural, the replicas interacting through the reconstructed free energy. We show how to improve this parallel implementation by resorting to some selection mechanism on the replicas. This is illustrated by computations on a model system of conformational changes.
description: 4 pages, 1 Figure
Tails: Chasing Comets with the Zwicky Transient Facility and Deep Learning
Creators: name: Duev, Dmitry A.
name: Bolin, Bryce T.
name: Graham, Matthew J.
name: Kelley, Michael S. P.
name: Mahabal, Ashish
name: Bellm, Eric C.
name: Coughlin, Michael W.
name: Dekany, Richard
name: Helou, George
name: Kulkarni, Shrinivas R.
name: Masci, Frank J.
name: Prince, Thomas A.
name: Riddle, Reed
name: Soumagnac, Maayane T.
name: van der Walt, Stéfan J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We present Tails, an open-source deep-learning framework for the identification and localization of comets in the image data of the Zwicky Transient Facility (ZTF), a robotic optical time-domain survey currently in operation at the Palomar Observatory in California, USA. Tails employs a custom EfficientDet-based architecture and is capable of finding comets in single images in near real time, rather than requiring multiple epochs as with traditional methods. The system achieves state-of-the-art performance with 99% recall, 0.01% false positive rate, and 1-2 pixel root mean square error in the predicted position. We report the initial results of the Tails efficiency evaluation in a production setting on the data of the ZTF Twilight survey, including the first AI-assisted discovery of a comet (C/2020 T2) and the recovery of a comet (P/2016 J3 = P/2021 A3).
The canonical trace and the noncommutative residue on the noncommutative torus
Creators: name: Lévy, Cyril
name: Neira-Jiménez, Carolina
name: Paycha, Sylvie
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 510 Mathematik

description: Using a global symbol calculus for pseudodifferential operators on tori, we build a canonical trace on classical pseudodifferential operators on non- commutative tori in terms of a canonical discrete sum on the underlying toroidal symbols. We characterise the canonical trace on operators on the noncommutative torus as well as its underlying canonical discrete sum on symbols of fixed (resp. any) non–integer order. On the grounds of this uniqueness result, we prove that in the commutative setup, this canonical trace on the noncommutative torus reduces to Kontsevich and Vishik’s canonical trace which is thereby identified with a discrete sum. A similar characterisation for the noncommutative residue on noncommutative tori as the unique trace which vanishes on trace–class operators generalises Fathizadeh and Wong’s characterisation in so far as it includes the case of operators of fixed integer order.
Αξιολόγηση της αζουροσιδίνης ως βιοδείκτη περιοδοντικής νόσου στο υγρό της ουλοδοντικής σχισμής
Creators: name: Ναλμπάντης Δημήτριος, Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Αζουροσιδίνη
Υγρό της ουλοδοντικής σχισμής
Βιοδείκτης
Azurocidin
Gingival Crevicular Fluid
Biomarker

description: Σκοπός της μελέτης είναι η αξιολόγηση της αζουροσιδίνης ως πιθανού βιολογικού δείκτη της περιοδοντικής νόσου στο υγρό της ουλοδοντικής σχισμής για την διάκριση μεταξύ της περιοδοντικής υγείας και της περιοδοντικής νόσου. Στην μελέτη εξετάστηκαν δύο ομάδες ατόμων, από τα οποία 25 ήταν περιοδοντικά υγιή και 53 ήταν ασθενείς με χρόνια περιοδοντίτιδα. Σε όλους τους συμμετέχοντες πραγματοποιήθηκε αξιολόγηση των κλινικών περιοδοντικών παραμέτρων και δειγματοληψία του υγρού της ουλοδοντικής σχισμής. Τα δείγματα αναλύθηκαν με την τεχνική ELISA για την ανεύρεση της συγκέντρωσης της αζουροσιδίνης. Οι δύο ομάδες διέφεραν στατιστικά σημαντικά ως προς όλες τις κλινικές παραμέτρους, με υψηλότερες τιμές στην ομάδα της χρόνιας περιοδοντίτιδας. Επίσης, τα επίπεδα συγκέντρωσης της πρωτεΐνης εμφάνισαν στατιστικά σημαντική διαφορά μεταξύ των δύο ομάδων, όπου ο μέσος όρος της ομάδας της χρόνιας περιοδοντίτιδας ήταν 4 φορές μεγαλύτερος (ΜΟ±ΤΑ, 93.26 ± 95.97 pg/30sec και 398.11 ± 158.27 pg/30sec για την ομάδα της περιοδοντικής υγείας και της χρόνιας περιοδοντίτιδας αντίστοιχα). Η αζουροσιδίνη στο υγρό της ουλοδοντικής σχισμής είναι ικανή να χρησιμοποιηθεί ως βιολογικός δείκτης για την διάγνωση της περιοδοντικής νόσου.
description: The aim of this study is to investigate the possible correlation of azurocidin with periodontal inflammation and evaluate this protein as a biomarker of periodontal disease. Τwo groups were compared. Twenty-five individuals participated in the periodontal healthy group (PH) and fifty-three subjects were in the chronic periodontitis group (CP). Clinical indices of periodontal disease, included probing depth, recession, clinical attachment level, bleeding on probing and plaque, were recorded from two calibrated examiners using calibrated probes. Furthermore, gingival crevicular fluid pooled samples were collected from all participants with absorbent filter paper strips. Samples were prepared for ELISA analysis, using specific antibodies for azurocidin. Analysis was performed using a commercial kit. Values were transformed and expressed for comparisons in pg/30 sec/sample. Statistical analysis was performed using non-parametric tests (Mann-Whitney test) with a statistically significant level of 0.05. Furthermore, values of sensitivity, specificity and diagnostic accuracy were measured. Demographic data were comparable between two groups (Mann-Whitney test p>0.05). Clinical parameters of periodontal disease were statistically significantly higher in chronic periodontitis group. The sensitivity of this study reached 100%, but the specificity remained to 40%. Finally, the diagnostic accuracy of azurocidin as a biomarker was 74%. Azurocidin of gingival crevicular fluid can be used as a biomarker of periodontal disease.