cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
HLE-UPC at SemEval-2021 Task 5: Multi-Depth DistilBERT for Toxic Spans Detection
Creators: name: Palliser-Sans, Rafel
name: Rial-Farràs, Albert
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: This paper presents our submission to SemEval-2021 Task 5: Toxic Spans Detection. The purpose of this task is to detect the spans that make a text toxic, which is a complex labour for several reasons. Firstly, because of the intrinsic subjectivity of toxicity, and secondly, due to toxicity not always coming from single words like insults or offends, but sometimes from whole expressions formed by words that may not be toxic individually. Following this idea of focusing on both single words and multi-word expressions, we study the impact of using a multi-depth DistilBERT model, which uses embeddings from different layers to estimate the final per-token toxicity. Our quantitative results show that using information from multiple depths boosts the performance of the model. Finally, we also analyze our best model qualitatively.
description: 7 pages, SemEval-2021 Workshop, ACL-IJCNLP 2021
Lower bounds for communication capacities of two-qudit unitary operations
Creators: name: Berry, Dominic W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that entangling capacities based on the Jamiolkowski isomorphism may be used to place lower bounds on the communication capacities of arbitrary bipartite unitaries. Therefore, for these definitions, the relations which have been previously shown for two-qubit unitaries also hold for arbitrary dimensions. These results are closely related to the theory of the entanglement-assisted capacity of channels. We also present more general methods for producing ensembles for communication from initial states for entanglement creation.
description: 9 pages, 2 figures, comments welcome
การเปรียบเทียบกลยุทธ์การจัดการสารสนเทศทางการตลาดและศักยภาพในการแข่งขันของธุรกิจสื่อสิ่งพิมพ์ในประเทศไทย
Creators: name: นิภาพร  อบทอง
Publisher: name: มหาวิทยาลัยมหาสารคาม
Year: 2557
Subjects: กลยุทธ์การจัดการสารสนเทศทางการตลาด, ศักยภาพในการแข่งขัน, ผู้บริหารฝ่ายการตลาด

description: 2, 33, วารสารมนุษยศาสตร์และสังคมศาสตร์  มหาวิทยาลัยมหาสารคาม
Complex marginal deformations of D3-brane geometries, their Penrose limits and giant gravitons
Creators: name: Avramis, Spyros D.
name: Sfetsos, Konstadinos
name: Zoakos, Dimitrios
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We apply the Lunin--Maldacena construction of gravity duals to beta-deformed gauge theories to a class of Type IIB backgrounds with U(1)^3 global symmetry, which include the multicenter D3-brane backgrounds dual to the Coulomb branch of N=4 super Yang-Mills and the rotating D3-brane backgrounds dual to the theory at finite temperature and chemical potential. After a general discussion, we present the full form of the deformed metrics for three special cases, which can be used for the study of various aspects of the marginally-deformed gauge theories. We also construct the Penrose limits of the solutions dual to the Coulomb branch along a certain set of geodesics and, for the resulting PP--wave metrics, we examine the effect of beta-deformations on the giant graviton states. We find that giant gravitons exist only up to a critical value of the sigma-deformation parameter, are not degenerate in energy with the point graviton, and remain perturbatively stable. Finally, we probe the sigma-deformed multicenter solutions by examining the static heavy-quark potential by means of Wilson loops. We find situations that give rise to complete screening as well as linear confinement, with the latter arising is an intriguing way reminiscent of phase transitions in statistical systems.
description: 53 pages, 5 figures; v3: version to appear in Nucl. Phys. B
Morita equivalence of Poisson manifold via stack groupoids
Creators: name: Bursztyn, Henrique
name: Zhu, Chenchang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: This is a condensed exposition of the results of a future work, based on a talk of the second author at the Oberwolfach workshop "Poisson Geometry", April 30--4 May 2007.
description: 4 pages, to appear in the Oberwolfach Reports
PAH Strength and the Interstellar Radiation Field around the Massive Young Cluster NGC3603
Creators: name: Lebouteiller, V.
name: Brandl, B.
name: Bernard-Salas, J.
name: Devost, D.
name: Houck, J. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present spatial distribution of polycyclic aromatic hydrocarbons and ionized gas within the Galactic giant HII region NGC3603. Using the IRS instrument on board the Spitzer Space Telescope, we study in particular the PAH emission features at ~5.7, 6.2, 7.7, 8.6, and 11.3um, and the [ArII] 6.99um, [NeII] 12.81um, [ArIII] 8.99um, and [SIV] 10.51um forbidden emission lines. The observations probe both ionized regions and photodissociation regions. Silicate emission is detected close to the central cluster while silicate absorption is seen further away. We find no significant variation of the PAH ionization fraction across the whole region. The emission of very small grains lies closer to the central stellar cluster than emission of PAHs. The PAH/VSG ratio anticorrelates with the hardness of the interstellar radiation field suggesting a destruction mechanism of the molecules within the ionized gas, as shown for low-metallicity galaxies by Madden et al. (2006).
description: Accepted for publication in ApJ. Corrected typos
title: Mathématiques et stéréotypes :
title: des enseignements qui renforcent la division socio sexuée de la discipline : analyse du manuel de 10e année et des effets sur les élèves
titleType: Subtitle
title: Mathématiques et stéréotypes :
titleType: AlternativeTitle
Creators: name: Spadini, Alessia
Publisher: name: Unknown
Year: 0
Subjects: subject: manuel
subject: mathématiques
subject: genre
subject: stéréotypes
subject: différenciation sexuée
subject: représentation

description: Le présent mémoire a comme objectif d’analyser les stéréotypes de genre au sein d’un manuel scolaire pour en discerner l’effet sur les élèves. Le manuel étudié est Mathématiques 9-10-11 qui se compose du Livre 10e et du Fichier 10e issu des moyens d’enseignements romands (MER). La recherche porte sur les stéréotypes de genre véhicules sur les femmes et les hommes, à travers la représentation des désignations, des activités des attributs et des interactions des personnages de ce manuel. L’ambition de ce mémoire est d’analyser le rôle du manuel dans l’attitude défaitiste des filles quant à leurs compétences dans la discipline des mathématiques. Serait-il possible que ce manuel reproduise des stéréotypes de genre qui renforceraient la division socio-sexuée de la discipline ? L’analyse du manuel est faite selon deux perspectives une quantitative, pour confirmer l’hypothèse d’une sous-représentation des personnages féminins, et une qualitative, plus riche et précise, qui permet d’identifier la présence de stéréotypes de genre dans le texte et les images. Les résultats montrent que ce manuel s’inscrit dans une vissée stéréotypée des femmes, à cause des désignations, des activités, des attributs et des interactions qui leurs sont associées. Au vu des résultats et en guise de conclusion, je propose des pistes d’amélioration, tant au niveau institutionnel qu’au niveau des enseignant·e·s. L’optique est celle d’atteindre un enseignement égalitaire et critique qui encourage les élèves à se poser des questions et à développer un sens critique qui leur permettra de mieux comprendre le monde et d’agir en tant que citoyens autonomes et responsables.
q-Deformed Supersymmetry and Dynamic Magnon Representations
Creators: name: Young, C. A. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It was recently noted that the dispersion relation for the magnons of planar N=4 SYM can be identified with the Casimir of a certain deformation of the Poincare algebra, in which the energy and momentum operators are supplemented by a boost generator J. By considering the relationship between J and su(2|2) x R^2, we derive a q-deformed super-Poincare symmetry algebra of the kinematics. Using this, we show that the dynamic magnon representations may be obtained by boosting from a fixed rest-frame representation. We comment on aspects of the coalgebra structure and some implications for the question of boost-covariance of the S-matrix.
description: 15 pages, LaTeX; (v2) references added
title: Romanesques. 2014, Hors-série
title: Animaux d'écritures : le lien et l'abîme
titleType: Subtitle
Creators: name: (:Unap)
Publisher: name: Classiques Garnier
Year: 2014
Subjects: subject: Littérature française du XIXe siècle
subject: Littérature française du XXe siècle
subject: Littérature française du XXIe siècle
subject: Philosophie
subject: Animal
subject: Animalité

description: Contributeurs : Aurélie Adler, André Benhaïm, Stéphanie Boulard, Jean-Louis Cabanès, Lucile Desblache, Claude Louis-Combet, Nicolas Piard, Elisabeth Plas, Alain Romestaing, Alain Schaffner et Antoine Traisnel.
Preheating in Derivatively-Coupled Inflation Models
Creators: name: Armendariz-Picon, Cristian
name: Trodden, Mark
name: West, Eric J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study preheating in theories where the inflaton couples derivatively to scalar and gauge fields. Such couplings may dominate in natural models of inflation, in which the flatness of the inflaton potential is related to an approximate shift symmetry of the inflaton. We compare our results with previously studied models with non-derivative couplings. For sufficiently heavy scalar matter, parametric resonance is ineffective in reheating the universe, because the couplings of the inflaton to matter are very weak. If scalar matter fields are light, derivative couplings lead to a mild long-wavelength instability that drives matter fields to non-zero expectation values. In this case however, long-wavelength fluctuations of the light scalar are produced during inflation, leading to a host of cosmological problems. In contrast, axion-like couplings of the inflaton to a gauge field do not lead to production of long-wavelength fluctuations during inflation. However, again because of the weakness of the couplings to the inflaton, parametric resonance is not effective in producing gauge field quanta.
description: 10 pages, 9 figures
Stimulated radiative laser cooling
Creators: name: Muys, Peter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Building a refrigerator based on the conversion of heat into optical energy is an ongoing engineering challenge. Under well-defined conditions, spontaneous anti-Stokes fluorescence of a dopant material in a host matrix is capable of lowering the host temperature. The fluorescence is conveying away a part of the thermal energy stored in the vibrational oscillations of the host lattice. In particular, applying this principle to the cooling of (solid-state) lasers opens up many potential device applications, especially in the domain of high-power lasers. In this paper, an alternative optical cooling scheme is outlined, leading to radiative cooling of solid-state lasers. It is based on converting the thermal energy stored in the host, into optical energy by means of a stimulated nonlinear process, rather than a spontaneous process. This should lead to better cooling efficiencies and a higher potential of applying the principle for device applications.
The Cosmological Dynamics of Interacting Holographic Dark Energy Model
Creators: name: Setare, M. R.
name: Vagenas, Elias C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Motivated by the recent observations for the cosmic acceleration and the suitable evolution of the Universe provided an interaction (decay of dark energy to matter) is incorporated in a cosmological model, we study the cosmological evolution of the Interacting Holographic Dark Energy scenario. Critical points are derived and their corresponding cosmological models are presented. The dynamical character of these models is revealed.
description: v1: 9 pages, LaTeX; v2: 12 pages, comments and clarifications added, to appear in IJMPD
VP9-14: Symmetrical Voltage-Controlled Stochastic Signal of Perpendicular Synthetic Antiferromagnetic Magnetic Tunnel Junctions
Creators: Yang Lv
Brandon Zink
Delin Zhang
and Jian-Ping Wang
Publisher: name: IEEE
Year: 2023

Magnetoresistance and Associated Effects (Virtual)
For practical applications, such as random number generation[1], and for novel computing, such as stochastic computing[2], stochastic neuromorphic computing[3], and the recently-proposed probabilistic computing[4], the stochasticity of magnetic tunnel junctions (MTJs) is the key element of the proposed systems. Furthermore, often the possibility of electrical control or tunability of the stochastic behavior is desired for robust, efficient, flexible, reconfigurable system designs with even additional functionalities. For example, the biasing on MTJ can tune the rate and mean of the stochastic fluctuation MTJ[5] to compensate for device-device variations, improve speed[6], or enable system throttling. On the other hand, the recent development of advanced MTJ involving implementing perpendicular synthetic antiferromagnetic (SAF) layer structures[7], which aims at significantly improving the performance for memory applications, also opens up new possibilities for MTJ-based stochastic signal generations for novel computing. Here, we report an experimental observation of an unusual voltage-controlled spontaneous telegraphic switching. Unlike what one would expect for the voltage-controlled magnetic anisotropy (VCMA) effect, the observed spontaneous telegraphic switching occurs at the electrical biases that are symmetrical on both positive and negative side. The MTJ stack structure is substrate/seed layers/FePd/Ru/FePd/Ta/CoFeB/MgO/CoFeB/Ta/[Pd/Co]8/Pd. Fig. 1 shows the tunneling magnetoresistance (TMR) vs. current bias. The bistability only appears around +-30 nA bias current. Fig. 2 shows that under +-30 nA electrical bias, the MTJ exhibits spontaneous telegraphic switching. We believe that this phenomenon is linked to the well-compensated SAF MTJ structures and the effect of both VCMA and the voltage modulation of interlayer exchange coupling[8]. We believe that such unique voltage-controlled stochastic behavior of perpendicular SAF MTJ could bring new opportunities for novel computing scenarios.References: [1] W. H. Choi et al., in 2014 International Electron Devices Meeting (IEDM), pp. 12.5.1-12.5.4 (2014) [2] Y. Lv and J.-P. Wang, in 2017 IEEE International Electron Devices Meeting (IEDM), pp. 36.2.1-36.2.4 (2017) [3] A. Sengupta, P. Panda, P. Wijesinghe et al., Scientific Reports, vol. 6, no. 1, pp. 1–8, (2016) [4] K. Y. Camsari, B. M. Sutton, and S. Datta, Applied Physics Reviews, vol. 6, no. 1., p. 011305 (2019) [5] B. R. Zink, Y. Lv, and J.-P. Wang, IEEE Trans. Electron Devices, vol. 66, no. 12, pp. 5353–5359 (2019) [6] Y. Lv, R. P. Bloom, and J. P. Wang, IEEE Magn. Lett., vol. 10, pp.1-5 (2019) [7] D. Zhang et al., https://arxiv.org/abs/1912.10289v1 (2019). [8] D. J. P. De Sousa, P. M. Haney, D. L. Zhang et al., Phys. Rev. B, vol. 101, no. 8, p. 081404 (2020)
VP3-14: Theoretical Study of Thermal Stability of α″–Fe16N2 Against Other Iron Nitrides
Creators: Peter Stoeckl
Przemyslaw W. Swatek
and Jian-Ping Wang
Publisher: name: IEEE
Year: 2023

Hard Magnetic Materials (Virtual)
α″–Fe16N2 has been investigated as one of promising candidates for environment friendly magnets.[1] While giant saturation magnetization has previously been experimentally observed in α″–Fe16N2, its magnetic anisotropy and structural stability leave room for improvement. Recent theoretical studies have considered alloying Fe16N2 with various elements to improve the magnetic properties and/or stability against decomposition.[2] However, estimates of stability in particular are typically restricted to simple ground-state-energy comparisons, i.e. effectively taken at 0 K. For a more practical measure of stability, we therefore extend ground-state energies, obtained with the plane-wave density-functional theory (DFT) code Quantum ESPRESSO, with appropriate empirical and/or statistical corrections to obtain free energies at arbitrary temperature. We then compare the stability of Fe16N2 against the neighboring phases in the Fe-N binary system, to estimate the range of temperatures at which it is stable. We compare against experimental observations of the Fe-N phase diagram.[3]References: [1] J.-P. Wang, J. Magn. and Magn. Mat. 497, 165962 (2020). [2] P. Stoeckl, P. W. Swatek, & J.-P. Wang, AIP Advances 11(1), 015039 (2021). [3] Cf. e.g. M. Hillert & M. Jarl, Metall. Transac. A 6A 553–9 (1975).
VP4-16: Micromagnetic Stimulation (μMS) of the Vagus Nerve: An in vivo Study
Creators: Renata Saha
Dusty Van Helden
Matthew S. Hopper
Susan A. Keistead
Walter C. Low
Theoden I. Netoff
John Osborn and Jian-Ping Wang
Publisher: name: IEEE
Year: 2023

Interdisciplinary Topics II: Magnetic Forces and Nanoparticles; Biomedicine; Education and Outreach
To treat diseases associated with vagal innervation of peripheral organs, selective activation of efferent and afferent vagal fibers is necessary. Due to the nerve's complex anatomy, fiber-specific activation proves challenging. Spatially selective neuromodulation using micromagnetic stimulation (µMS) is showing significant promise. This neuromodulation technique uses microcoils (µcoils) powered by a time-varying current to generate magnetic fields, inducing a highly directional electric field in the nerve. In this study on rodent cervical vagus, a solenoidal-shaped μcoil was oriented at an angle to the left and right branches of the nerve. The aim was to measure changes in mean arterial pressure (MAP) and heart rate (HR) from the femoral artery after vagus µMS. The µcoils were powered by a 3 A single-cycle sinusoidal current with pulse widths (PW) of 100, 500, and 1000 µsec at a frequency of 20 Hz. Under isoflurane anesthesia, µMS of the left vagus at 1000 µsec PW led to an average MAP drop of 21.4 mmHg (SD = 28.5 mmHg, n=7). Similarly, µMS of the right vagus under isoflurane resulted in an average MAP drop of 2.24 mmHg (SD = 13.6 mmHg, n=7). This MAP reduction is consistent with electrical vagus stimulation, regulating heart contractility and blood vessel constriction. Anesthesia was switched to urethane as no significant HR changes were observed under isoflurane. No changes in MAP or HR were noted during µMS of the cervical vagus under urethane anesthesia. From our experiments, the left branch seems more susceptible to µMS than the right. However, we believe that due to the spatial selectivity of μMS, the fibers associated with changes in MAP and HR on the right remained inactive. The choice of anesthesia evidently influenced the efficacy of µMS on hypertension-linked vagal fibers. Finally, the absence of HR modulation upon μMS could offer alternative treatment options using VNS with fewer heart-related side-effects.References: R. Saha, S. Faramarzi and R. Bloom, Journal of Neural Engineering., Vol. 19, Num. 1 (2022)
Non-commutative Field Theory with Twistor-like Coordinates
Creators: name: Taylor, Tomasz R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider quantum field theory in four-dimensional Minkowski spacetime, with the position coordinates represented by twistors instead of the usual world-vectors. Upon imposing canonical commutation relations between twistors and dual twistors, quantum theory of fields described by non-holomorphic functions of twistor variables becomes manifestly non-commutative, with Lorentz symmetry broken by a time-like vector. We discuss the free field propagation and its impact on the short- and long-distance behavior of physical amplitudes in perturbation theory. In the ultraviolet limit, quantum field theories in twistor space are generically less divergent than their commutative counterparts. Furthermore, there is no infrared--ultraviolet mixing problem.
description: Momentum-dependence of the propagator and more details. Final version for Physics Letters B
Physical properties of a new cuprate superconductor Pr_2Ba_4Cu_7O_{15-δ}
Creators: name: Matsushita, Akiyuki
name: Fukuda, Kazunori
name: Yamada, Yuh
name: Ishikawa, Fumihiro
name: Sekiya, Syun
name: Hedo, Masato
name: Naka, Takashi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present studies of the thermal, magnetic and electrical transport properties of reduced polycrystalline Pr_2Ba_4Cu_7O_{15-δ} (Pr247) showing a superconducting transition at Tc = 10 - 16 K and compare them with those of as-sintered non-superconducting Pr247. The electrical resistivity in the normal state exhibited T2 dependence up to approximately 150 K. A clear specific heat anomaly was observed at Tc for Pr247 reduced in a vacuum for 24 hrs, proving the bulk nature of the superconducting state. By the reduction treatment, the magnetic ordering temperature TN of Pr moments decreased from 16 to 11 K, and the entropy associated with the ordering increased, while the effective paramagnetic moments obtained from the DC magnetic susceptibility varied from 2.72 to 3.13 mB. The sign of Hall coefficient changed from positive to negative with decreasing temperature in the normal state of a superconducting Pr247, while that of as-sintered one was positive down to 5 K. The electrical resistivity under high magnetic fields was found to exhibit T^a dependence (a = 0.08 - 0.4) at low temperatures. A possibility of superconductivity in the so-called CuO double chains is discussed.
description: Science and Technology of Advanced Materials (in press)
Η τέχνη της προσωπογραφίας στη Βυζαντινή Μουσική: το πρόσωπο της Παναγίας
Creators: name: Γούση, Βασιλική Γ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Βυζαντινή Μουσική
Μουσική Προσωπογραφία
Παναγία
Ανάλυση και Παλαιογραφία Βυζαντινής Μουσικής
Byzantine Music
Art of Musical Portraying
The Most Holy Virgin Mary
Analysis and Paleography of Byzantine Music

description: Ἡ τέχνη τῆς μουσικῆς προσωπογραφίας, ὡς πεδίο παρθένο καὶ ἀνεξερεύνητο, κινεῖ τὸ ἐρευνητικὸ ἐνδιαφέρον γιὰ τὴν ἐκπόνηση τῆς παρούσης διατριβῆς, ἑστιάζοντας στὸ πρόσωπο τῆς Παναγίας. Ὁ ἀπέραντος λειμῶνας τῆς μελουργικῆς παραγωγῆς ἀποτελεῖ τὸ καταλληλότερο ὑπόβαθρο γιὰ νὰ οἰκοδομηθεῖ καὶ νὰ ἀναδειχθεῖ ἡ μουσικὴ ἀπεικόνιση τῆς Θεοτόκου. Διατρέχοντας τὸ περιεχόμενο τῆς παρούσης διατριβῆς ἀναγνωρίζεται ἡ κλιμακωτὴ προσέγγιση τοῦ θέματος μὲ εὐμέθοδο καὶ συστηματικὸ τρόπο. Ἔτσι, στὸ πρῶτο μέρος, δίκην εἰσαγωγῆς, προσεγγίζεται ὁ ὅρος «μουσικὴ προσωπογραφία», ἐνῶ στὸ δεύτερο μέρος ἐπιχειρεῖται μία συγκεντρωτικὴ καταγραφὴ τῶν θεοτοκίων μελῶν κατὰ γένος μελοποιίας, μὲ βάση τοὺς κυριώτερους καταλόγους χειρογράφων βυζαντινῆς μουσικῆς. Στὴ συνέχεια προβάλλεται ὡς κατ’ ἐξοχὴν μέθοδος προσέγγισης τῆς προσωπογραφίας στὴν ψαλτικὴ τέχνη ἡ ἀνάλυση. Μιὰ ἐνδιαφέρουσα ἔρευνα τοῦ βαθμοῦ ἀντίληψης τῆς μουσικῆς ἀπεικόνισης τοῦ προσώπου τῆς Παναγίας ἀπὸ τοὺς πιστοὺς περιλαμβάνεται στὸ παράρτημα ὡς κατακλεῖδα τῆς παρούσης ἐργασίας. Δύο δὲ δίσκοι ἀκτῖνος ὁλοκληρώνουν τὴν παροῦσα ἐργασία· ὁ πρῶτος μὲ μία πιλοτικὴ Βάση Δεδομένων θεοτοκίων μελοποιημάτων συμβάλλοντας στὴ σύγχρονη Βυζαντινομουσικολογικὴ ἔρευνα, καὶ ὁ δεύτερος μὲ ἠχογραφήσεις ἐπιλεγμένων μελῶν πρὸς τιμὴν τῆς Θεοτόκου ἀπὸ τὴ γράφουσα, προσφέροντας τὴν ἀμεσότητα τῆς μουσικῆς ἐμπειρίας.
description: The art of musical portraying, as a new and unexplored field, initiates research interest for the preparation of this doctoral dissertation, focusing on the person of the Most Holy Virgin Mary. The vast domain of the melopoeic creation constitutes the most suitable background in order to explore the musical depiction of the Virgin Mary. The content of this dissertation is built up in a climatic way, aiming at both a historical and a systematical presentation of the theme. So, in the first part, the term “musical portraying” is approached, while the second part contains a commented list of theotokia, arranged according to the different genres and categories of chant, based mainly on descriptive catalogues of byzantine musical manuscripts. Thus, analysis appears as a privileged method of investigation for the art portraying in Byzantine chant. An interesting musical - psychological survey about the impact of the art of musical portraying of the Holy Virgin on faithful people is included in the annex of this dissertation. Two CD’s complete this dissertation: The first one contains a Database of theotokia, a useful instrumentum studiorum for Byzantine Music Studies. The second one presents recordings of selected chants in honor of the Most Holy Virgin Mary, sung by the author, thus leading the reader to a direct experience of the musical pieces included in this work.
Μαθηματική παιδαγωγική γνώση και διδακτικές πρακτικές στην προσχολική εκπαίδευση: η περίπτωση της μέτρησης της επιφάνειας
Creators: name: Κολιπέτρη, Ζωή Β.
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Μαθηματική παιδαγωγική γνώση
Μαθηματική ποιότητα της διδασκαλίας
Επαγγελματική ανάπτυξη
Μέτρηση της επιφάνειας
Μathematics pedagogical content knowledge
Mathematical quality of instruction
Professional development
Area measurement

description: Βασικός στόχος της παρούσας μελέτης είναι η διερεύνηση των γνωστικών πεδίων της μαθηματικής παιδαγωγικής γνώσης που κατέχουν οι εκπαιδευτικοί για τη μέτρηση της επιφάνειας και η ενδυνάμωσή τους μέσω μιας επιμορφωτικής παρέμβασης. Η μαθηματική παιδαγωγική γνώση καθορίζεται από το εννοιολογικό υπόβαθρο που κατέχουν οι εκπαιδευτικοί, σχετικό με τις μαθηματικές έννοιες που διδάσκουν (τι γνωρίζουν;), από τη γνώση τους για τις δυνατότητες και τις δυσκολίες που εμφανίζουν τα παιδιά, σχετικές με τις υπό ανάπτυξη μαθηματικές έννοιες, όταν δρουν στην εκπαιδευτική διαδικασία (ποιος δρα;) και από τη γνώση των κατάλληλων διδακτικών πρακτικών, οι οποίες θα συνεισφέρουν στη μαθηματική ποιότητα της εκπαιδευτικής διαδικασίας (πώς δρα ο εκπαιδευτικός;). Παράλληλα, επιχειρήθηκε η διερεύνηση της σχέσης τους με τη μαθηματική ποιότητα της εκπαιδευτικής διαδικασίας που οργανώνεται από τους εκπαιδευτικούς, όταν διδάσκουν μετρικές έννοιες, πριν και μετά από την επιμορφωτική παρέμβαση. Από την έρευνα διαπιστώθηκε ότι μέσω της επιμορφωτικής παρέμβασης, επήλθε η βελτίωση των γνωστικών πεδίων της μαθηματικής παιδαγωγικής γνώσης, των απόψεων, των διδακτικών πρακτικών και της μαθηματικής ποιότητας των διδασκαλιών στη μέτρηση της επιφάνειας.
description: The key objective of this study is to explore the fields of study of the mathematics pedagogical content knowledge that teachers draw on when measuring an area and to enhance them through educational intervention. At the same time, we endeavor to delve into their relationship with the mathematical quality of the educational process that is organized by teachers, when teaching metric concepts, both before and after the instructional intervention. Mathematics pedagogical content knowledge is determined by the teachers’ conceptual background, in relation to the mathematical concepts they teach (what do they know?), stemming from their knowledge of the possibilities and difficulties that children are experiencing with regard to the mathematical concepts developed when engaging in the educational process (who is acting?) and from their knowledge of the appropriate teaching practices which will contribute to the mathematical quality of instruction (how does the teacher act?). The survey established that the instructional intervention has led to an improvement in the fields of study of the mathematical pedagogical knowledge, in the views, in the teaching practices and in the mathematical quality of instruction with regard to the measurement of an area.
Optimal survey parameters: Ly$α$ and H$α$ intensity mapping for synergy with the 21cm signal during reionization
Creators: name: Heneka, Caroline
name: Cooray, Asantha
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Intensity mapping of multiple emission lines is emerging as a new branch to astronomy, to probe both properties of ionizing sources and the medium between, in particular the intergalactic medium. For Epoch of Reionization (EoR) studies, both multi-line experiments and analysis methods are still in their infancy. Here we explore optimal survey parameters for Ly$α$ (and H$α$) intensity mapping up to high redshifts of reionization, and requirements for optimised synergy with 21cm experiments. We investigate line sensitivity, spectral resolution and detector pixel size requirements for optimal (high signal-to-noise) mission output. Power and cross-power spectra in a fiducial setup are derived, as are mock intensity maps. For line power spectrum measurements a cumulative signal-to-noise of O$\left(10^3 \right)$, and for respective cross-spectra with SKA 21cm observations of O$\left(10\right)$ to O$\left(10^2\right)$ are possible per redshift bin around the midpoint of reionization. These high signal-to-noise tomographic measurements are in reach for line sensitivities $>8\times 10^{-18}$erg$\,$s$^{-1}$sr$^{-1}$Hz$^{-1}$, spectral resolution $R>250$ and detector pixel sizes $<2\,$arcsec; all three requirements are met by the proposed Cosmic Dawn Intensity Mapper (CDIM). For CDIM similar S/N values are in reach for H$α$. Already the planned NASA mission SPHEREx will detect during the EoR Ly$α$ autopower and cross power with 21cm, for sensitivities better than $10^{-18}$erg$\,$s$^{-1}$sr$^{-1}$Hz$^{-1}$ in a moderate 21cm foreground scenario (better than $10^{-17}$erg$\,$s$^{-1}$sr$^{-1}$Hz$^{-1}$ in an optimistic scenario). We advocate for IR missions in flavor of CDIM for a leap in IM and finish by providing a cookbook for successful multi-line IM during the EoR.
description: 12 pages, 6 (+2) figures. Figure 4 and 6 as well as section 6 present main conclusions. v2 adds prospects for measurements with HERA, as well appendices with background on IGM attenuation, auto-power spectra, and the Knox criterion for optimised errors
VP9-17: Spintronics with Black Phosphorus
Creators: H. Wei
M. Galbiati
J. Peiro
F. Brunnett
V. Zatko
R. Galceran
P. Brus
F. Godel
D. Perconte
F. Bouamrane
O. Bezencenet
B. Servet
F. Petroff
M.-B. Martin
B. Dlubak
P. Seneor
Publisher: name: IEEE
Year: 2023

Magnetoresistance and Associated Effects (Virtual)
Spintronics is a paradigm focusing on spin as the information vector in fast and ultra-low-power that aims at providing more complex architectures for beyond-CMOS solutions from storage to quantum information. 2D materials opened novel exciting opportunities in terms of functionalities and performances for spintronics devices[1-3]. In this direction, graphene has been shown to provide both highly efficient spin information transport properties [4,5] and potential for strong spin filtering in 2D-MTJs[1-3]. However it lacks a gap and its semiconducting sibling has remained elusive. Black phosphorus (BP) possesses major properties (high mobilities, high on/off ratios in transistors) and has attracted explosive interest since 2014. Additionally, its bandgap is predicted to be widely tunable in relation to the number of stacked layers and remains direct from the bulk to the monolayer. Thanks to the natural low spin-orbit coupling, BP is expected to present highly efficient spin information transport, similar to graphene [4,5] but with the addition of a band gap. This difference with graphene is fundamental for the implementation of spin manipulation schemes and the experimental realization of a spin gate. Here we present the first results of large MR in efficient BP spin valve devices. We will first present a recently developed in-situ approach to circumvent the main issue of degradation under atmospheric conditions [6,7,8]. By passivating the BP without exposing it to air we achieve protection down to the monolayer. We will further show that this passivation even can play the role of the tunnel barrier required for efficient spin injection [4,5,7,8] and provide a high potential path for spintronics applications from vertical to lateral devices. We will finally demonstrate the BP integration into Co/BP/Co spin valves showing large spin signals (up to 500% MR). We will explain those results, developing a novel selective spin-splitted transport mechanism supported by first-principle theoretical investigation. Overall, this illustrates the potential of BP for spin injection/detection, strongly supporting BP's vision as an outstanding platform for spintronics.References: [1] V. Zatko, M. Galbiati, S. M.-M. Dubois et al., ACS Nano., Vol.13, p.14468 (2019) , [2] M. Piquemal-Banci, R. Galceran, S. M.-M. Dubois et al., Nat Commun., Vol.11, p.5670 (2020), [3] M. Piquemal-Banci, R. Galceran, M.-B. Martin et al., J.Phys.D., Vol.50, p.203002 (2017) [4] B. Dlubak, M.-B. Martin, C. Deranlot et al., Nature Phys, Vol.8, p.557 (2012), [5] P. Seneor, B. Dlubak, M.-B. Martin et al., MRS Bulletin, Vol.37, p.1245 (2012) [6] A. Favron, E. Gaufrès, F. Fossard et al., Nature Mat, Vol.14, p.826 (2015) [7] R. Galceran, E. Gaufres, A. Loiseau et al., APL., Vol.111, p.243101 (2017), [8] L.-M. Kern, R. Galceran, V. Zatko et al., APL., Vol.114, p.053107 (2019)
Production and signatures of multi-flavour dark matter scenarios with t-channel mediators
Creators: name: Herms, Johannes
name: Ibarra, Alejandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the phenomenology of a dark matter scenario containing two generations of the dark matter particle, differing only by their mass and their couplings to the other particles, akin to the quark and lepton sectors of the Standard Model. For concreteness, we consider the case where the two dark matter generations are Majorana fermions that couple to a right-handed lepton and a scalar mediator through Yukawa couplings. We identify different production regimes in the multi-flavor dark matter scenario and we argue that in some parts of the parameter space the heavier generation can play a pivotal role in generating the correct dark matter abundance. In these regions, the strength of the dark matter coupling to the Standard Model can be much larger than in the single-flavored dark matter scenario. Correspondingly the indirect and direct detection signals can be significantly boosted. We also comment on the signatures of the model from the decay of the heavier dark matter generation into the lighter.
description: 16 pages, 5 figures
Recovering the Potential and Order in One-Dimensional Time-Fractional Diffusion with Unknown Initial Condition and Source
Creators: name: Jin, Bangti
name: Zhou, Zhi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This paper is concerned with an inverse problem of recovering a potential term and fractional order in a one-dimensional subdiffusion problem, which involves a Djrbashian-Caputo fractional derivative of order $α\in(0,1)$ in time, from the lateral Cauchy data. In the model, we do not assume a full knowledge of the initial data and the source term, since they might be unavailable in some practical applications. We prove the unique recovery of the spatially-dependent potential coefficient and the order $α$ of the derivation simultaneously from the measured trace data at one end point, when the model is equipped with a boundary excitation with a compact support away from $t=0$. One of the initial data and the source can also be uniquely determined, provided that the other is known. The analysis employs a representation of the solution and the time analyticity of the associated function. Further, we discuss a two-stage procedure, directly inspired by the analysis, for the numerical identification of the order and potential coefficient, and illustrate the feasibility of the recovery with several numerical experiments.
description: 23 pages, 3 figures, 3 tables, with updated title, to appear at Inverse Problems
AS-05: Magnetic and magnetocaloric properties of the multi-component Mn_0.5Fe_0.5Ni0.95Cr0.05Si0.95Al0.05
Creators: Ashika Bhatta
Jacob Casey
Sharmistha Bhattacharjee
Arjun K. Pathak
Mahmud Khan
Publisher: name: IEEE
Year: 2023

Multi-Functional Magnetic Materials and Applications I
A selected group of solid-state materials are known to exhibit first-order phase transition where their magnetic and crystalline properties change simultaneously. This coupled phase transition is of strong interest due to the numerous functional properties associated with them. The magnetocaloric effect is one such property that can be exploited in energy-efficient magnetic refrigeration technology. Here we present an experimental study on the first-order phase transition and associated magnetocaloric properties of Mn0.5Fe0.5Ni0.95Cr0.05Si0.95Al0.05. The material is related to the Mn1-xFex-δNiδSi1-yAly family whose phase transition temperatures are tunable [1, 2]. X-ray diffraction data for the sample showed that both the orthorhombic and hexagonal crystalline phases coexist at room temperature. The first-order phase transition was observed at ~325 K during heating and at ~306 K during cooling, showing a thermomagnetic hysteresis of ~19 K. The entropy changes evaluated from the isothermal magnetization data peaked at 321 K during warming and at 312 K during cooling, showing a thermomagnetic hysteresis of ~9 K. Peak entropy changes of -16 J kg-1 K-1 and -42 J kg-1 K-1 were observed on heating for field changes of 20 kOe and 50 kOe, respectively. The associated refrigeration capacities were 74 J/kg and 194 J/kg. The experimental results and related discussion of this study will be presented.References: [1] A. Biswas, A.K. Pathak, N.A. Zarkevich, X. Liu, Y. Mudryk, V. Balema, D.D. Johnson, and V.K. Pecharsky, Acta Mater. 180, 341 (2019). [2] Jacob Casey, Babajide Akintunde, Ranjit Chandra Das, Christopher Hanley, Brandon Reese, Mahmud Khan, Arjun K. Pathak, J. Magn. Magn. Mater. 579, 170862 (2023).
Particle acceleration around rotating Einstein-Born-Infeld black hole and plasma effect on gravitational lensing
Creators: name: Babar, Gulmina Zaman
name: Atamurotov, Farruh
name: Islam, Shafqat Ul
name: Ghosh, Sushant G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider a time-like geodesics in the background of rotating Einstein-Born-Infeld (EBI) black hole to examine the horizon and ergosphere structure. The effective potential that governs the particle's motion in the spacetime and the innermost stable circular orbits (ISCO) is also studied. A qualitative analysis is conducted to find the redshifted ultrahigh centre-of-mass (CM) energy as a result of a two-particle collision specifically near the horizon. The recent Event Horizon Telescope (EHT) triggered a surge of interest in strong gravitational lensing by black holes, which provide a new tool comparing the black hole lensing in general relativity and alternate gravity theories. Motivated by this, we also discussed both strong and weak-field gravitational lensing in the space-time discretely for a uniform plasma and a singular isothermal sphere. We calculated the light deflection coefficients $\bar{a}$ and $\bar{b}$ in the strong field limits, and their variance with the rotational parameter $a$ for different plasma frequency as well as in vacuum. For EBI black holes, we found that plasma's presence increases the photon sphere radius, the deflection angle, the deflection coefficients $\bar{a}$, $\bar{b}$, the angular positions and the angular separation between the relativistic images. It is also shown that with increasing spin the impact of plasma on a strong gravitational lensing becomes smaller as the spin parameter grows in the prograde orbit ($a>0$). For extreme black holes, the strong gravitational effects in the homogenous plasma are similar to those of in a vacuum. We investigate strong gravitational lensing effects by supermassive black holes Sgr A* and M87*...
description: 22 pages, 14 figures
VP7-05: Transition States for Thermally Activated Switching of Perpendicular Magnetic Nanopillars in Transverse Fields
Creators: Corrado Capriata
Gunnar Malm
Gabriel Chaves-O’Flynn and Andrew Kent
Publisher: name: IEEE
Year: 2023

Magnetization Dynamics and Switching (Virtual)
Perpendicular Magnetic Tunnel Junctions (pMTJs) are good candidates in future approaches for stochastic computing since they provide two equally probable states separated by an energy barrier which can be reduced with in-plane fields. Thermally activated swiching between these states can be used to generate a random stream of bits. Here, we report on numerical and analytical studies of activation barriers for thermally activated switching of the free layer of a pMTJ with circular shape. In a fashion that mimicks previous results of thermal activation transition states [1], we identify two reversal modes for thermal activation that dominate at different points of our parameter state. For small disks, the thermally activated switching occurs via a uniformly magnetized state (Macrospin model) and has been known for a long time [2]. For large disks, the sadlle state is not uniform but a domain wall with a sigmoidal profile that depends on diameter and applied field [Fig 1] (Domain Wall mediated model). We have compared our analytical predictions with numerical studies as follows: the macrospin model is compared with overdamped micromagnetic simulations in OOMMF, the Domain Wall mediated model is compared to results from String Method calculations [3]. For small samples the macrospin model is the preferred reversal mode and the energy barrier values overlap into a single curve after a shape dependent correction is taken into account. For large samples, the Wall Mediated reversal is the preferred transition mode and the analytical model approximates very well results from String Method calculations [Fig. 2].References: [1] Martens et al., "Magnetic reversal in nanoscopic ferromagnetic rings", PRB 73, 054413 [2] Garanin et al.,“Thermally activated escape rates of uniaxial spin systems with transverse field:Uniaxial crossovers,” PRE 60, 6499 (1999). [3] E,etal.,“Simplified and improved string method for computing the minimum energy paths in barrier-crossing events” PRB 66, 052301 (2002) This research is supported in part by: National Science Centre Poland under OPUS funding grant No. 2019/33/B/ST5/02013 Polish National Science Center, project no. UMO-2018/30/Q/ST3/00416; the Swedish Research Council (VR), project Fundamental Fluctuations in Spintronics, 2017-04196. The research at NYU was supported by the DOE Office of Science (ASCR /BES) for our Microelectronics Co- Design project COINLFIPS. Any subjective views or opinions that might be expressed in the paper do not necessarily represent the views of the U.S. DOE or the United States Government.
VP17-05: Understanding stability and behavior of Magnetic Tunnel Junction (MTJ) using Electron Spin Resonance (ESR)
Creators: Betelhiem N. Mengesha
Juan Estevez Hernandez
Arnold Feutmba
Andrew C. Grizzle
Jose Martinez-Lillo
and Pawan Tyagi
Publisher: name: IEEE
Year: 2023

Thin Films, Multilayers and Interface Effects (Virtual)
The unique attributes of magnetic tunnel junctions (MTJs), stemming from their sandwich-like structure, enable them to have promising applications across diverse fields. MTJs are composed of two ferromagnetic electrode layers separated by a thin insulator, such as aluminum oxide. MTJs properties could be tuned by carefully selecting and designing the materials used for the ferromagnetic electrodes and the thickness of the insulating layer. Thermal stability refers to the MTJ's ability to maintain magnetization despite thermal fluctuations. This study examines the thermal stability of a molecular spintronic device utilizing a magnetic tunnel junction (MTJMSD) with varying insulator thicknesses. The device fabrication involves photolithography, thin film sputtering, and a molecule attachment process. Single-molecule magnet (SMM) is used to create a channel connecting the top and bottom electrodes on the exposed side edge of the MTJ. To investigate the impact of increasing temperature on the device, the samples are subjected to a gradual heating process. The temperature is raised in 20°C increments, starting from room temperature until reaching 190°C. To explore the temperature-dependent variances, the magnetic resonance of the device is measured utilizing Electron Spin Resonance (ESR) technique. Initially, the ESR measurement is conducted at room temperature, serving as the baseline reference. Following this, the devices are exposed to heat, and subsequent ESR measurements are taken to examine any alterations in the magnetic resonance properties induced by the temperature changes. This approach allows for the investigation of temperature-dependent differences in the device's characteristics. The findings reveal that MTJMSD with thinner insulator thickness exhibits superior thermal stability compared to devices with thicker insulators. This observation correlates directly with the effect of the molecule, as the MTJMSD with a thinner insulator experiences a pronounced impact from the molecule, resulting in strong coupling and heightened thermal stability. This study sheds light on the creation of thermally stable MTJMSD, which is imperative for achieving reliable and consistent device performance.