cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Becoming a Physicist: The Roles of Research, Mindsets, and Milestones in upper-division student perceptions
Creators: name: Irving, Paul W.
name: Sayre, Eleanor C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: As part of a longitudinal study into identity development in upper-level physics students, a phenomenographic research method was used to examine students' perceptions of what it means to be a physicist. The results revealed four different categories of perception of what it means to be a physicist, with a clear distinction in the level of exclusivity students associate with being a physicist and differences of importance of research and its association with being a physicist. We find a relationship between students' perceptions of physicists and students' goal orientation. The paper highlights a need for faculty to not just emphasize the importance of research to students' academic development but also to further demonstrate and explain what research entails and the role it plays in a physicist's identity.
description: 14 pages, 3 figures, submitted to Phys Rev ST - PER: Focused Collection on Upper Division
Asymptotic theory of not completely integrable soliton equations
Creators: name: Kamchatnov, A. M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We develop the theory of transformation of intensive initial nonlinear wave pulses to trains of solitons emerging at asymptotically large time of evolution. Our approach is based on the theory of dispersive shock waves in which the number of nonlinear oscillations in the shock becomes the number of solitons at the asymptotic state. We show that this number of oscillations, which is proportional to the classical action of particles associated with the small-amplitude edges of shocks, is preserved by the dispersionless flow. Then the Poincaré-Cartan integral invariant is also constant and therefore it reduces to the quantization rule similar to the Bohr-Sommerfeld quantization rule for linear spectral problem associated with completely integrable equations. This rule yields a set of `eigenvalues' which are related with the asymptotic solitons' velocities and other their characteristics. Our analytical results agree very well with the results of numerical solutions of the generalized nonlinear Schrödinger equation.
description: 12 pages
Cualidades físicas del cuerpo: coordinación y equilibrio
Creators: name: Montaña, Luis Eduardo
Publisher: name: Universidad del Rosario
Year: 2022

description: Documento perteneciente al mooc Comunicación oral en entornos jurídicos mediante el cual se abordan dos cualidades físicas más que se deben tener en cuenta y contribuyen al desarrollo de habilidades para ser mejores oradores.
Leaf-to-leaf distances and their moments in finite and infinite m-ary tree graphs
Creators: name: Goldsborough, Andrew M.
name: Rautu, S. Alex
name: Römer, Rudolf A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the leaf-to-leaf distances on full and complete m-ary graphs using a recursive approach. In our formulation, leaves are ordered along a line. We find explicit analytical formulae for the sum of all paths for arbitrary leaf-to-leaf distance r as well as the average path lengths and the moments thereof. We show that the resulting explicit expressions can be recast in terms of Hurwitz-Lerch transcendants. Results for periodic trees are also given. For incomplete random binary trees, we provide first results by numerical techniques; we find a rapid drop of leaf-to-leaf distances for large r.
description: 10 pages, 7 figures
THE IMPORTANCE OF COMPARATIVE-ANALYTICAL STUDY OF EDUCATIONAL METHODOLOGIES IN ACHIEVING SUSTAINABLE DEVELOPMENT
Creators: name: Khudaynazarov, Egambergan
Publisher: name: Zenodo
Year: 2024

description: Human capital is the main foundation of sustainable development. Education is an important tool for developing human knowledge and skills, raising social awareness, and achieving the goals of sustainable development. In this article, different educational methodologies and their contribution to the goals of sustainable development are studied on the basis of comparative analysis. The importance of educational methodologies in achieving these goals and their use in the modern educational process are discussed.
TIME RESOLVED OPTICAL MEASUREMENTS ON CARBON NANOTUBES STRUCTURES FOR PHOTOVOLTAIC APPLICATIONS
Creators: name: PONZONI, STEFANO
Publisher: name: Universit� degli Studi di Milano
Year: 2014

description: With their intriguing electronic and optical properties carbon nanotubes are promising materials for future optoelectronics and photovoltaic applications. Recently single walled (SWCNT) and multi walled carbon nanotubes (MWCNT) aggregates were employed in hybrid solar cells . Despite the promising results the photoexcited carriers behavior in these novel devices is not fully understood . In this thesis, using ultrafast time-resolved optical spectroscopy, we investigate the carriers relaxation dynamics in various SWCNT and MWCNT architectures with potential photovoltaic applications. In particular, using time resolved transient reflectivity, we detect the signature of the charge transfer process taking place at the interface of a SWCNT / n-doped Silicon heterojunction solar cell on a few picosecond time scale.
Cómo se relaciona el estilo de texto con el ejercicio del abogado
Creators: name: Criales Cárdenas Diana Patricia
Publisher: name: Universidad del Rosario
Year: 2022

description: Recurso audiovisual del mooc Corrección de textos jurídicos en el cual se da un contexto sobre la relación que tiene le estilo del texto con el ejercico del abogado.
Graph properties of graph associahedra
Creators: name: Manneville, Thibault
name: Pilaud, Vincent
Publisher: name: arXiv
Year: 2014
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52B05, 05C12, 05C45

description: A graph associahedron is a simple polytope whose face lattice encodes the nested structure of the connected subgraphs of a given graph. In this paper, we study certain graph properties of the 1-skeleta of graph associahedra, such as their diameter and their Hamiltonicity. Our results extend known results for the classical associahedra (path associahedra) and permutahedra (complete graph associahedra). We also discuss partial extensions to the family of nestohedra.
description: 26 pages, 20 figures. Version 2: final version with minor corrections
Dopant-assisted stabilization of negatively charged single nitrogen-vacancy centers in phosphorus-doped diamond at low temperatures
Creators: name: Geng, Jianpei
name: Shalomayeva, Tetyana
name: Gryzlova, Mariia
name: Mukherjee, Amlan
name: Santonocito, Santo
name: Dzhavadzade, Dzhavid
name: Dasari, Durga
name: Kato, Hiromitsu
name: Stöhr, Rainer
name: Denisenko, Andrej
name: Mizuochi, Norikazu
name: Wrachtrup, Jörg
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Charge state instabilities have been a bottleneck for the implementation of solid-state spin systems and pose a major challenge to the development of spin-based quantum technologies. Here we investigate the stabilization of negatively charged nitrogen-vacancy (NV$^-$) centers in phosphorus-doped diamond at liquid helium temperatures. Photoionization of phosphorous donors in conjunction with charge diffusion at the nanoscale enhances NV$^0$ to NV$^-$ conversion and stabilizes the NV$^-$ charge state without the need for an additional repump laser. The phosphorus-assisted stabilization is explored and confirmed both with experiments and our theoretical model. Stable photoluminescence-excitation spectra are obtained for NV$^-$ centers created during the growth. The fluorescence is continuously recorded under resonant excitation to real-time monitor the charge state and the ionization and recombination rates are extracted from time traces. We find a linear laser power dependence of the recombination rate as opposed to the conventional quadratic dependence, which is attributed to the photo-ionization of phosphorus atoms.
description: 8 pages, 4 figures
Consistent estimation of dynamic and multi-layer block models
Creators: name: Han, Qiuyi
name: Xu, Kevin S.
name: Airoldi, Edoardo M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Methodology (stat.ME)
subject: Social and Information Networks (cs.SI)
subject: Statistics Theory (math.ST)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Significant progress has been made recently on theoretical analysis of estimators for the stochastic block model (SBM). In this paper, we consider the multi-graph SBM, which serves as a foundation for many application settings including dynamic and multi-layer networks. We explore the asymptotic properties of two estimators for the multi-graph SBM, namely spectral clustering and the maximum-likelihood estimate (MLE), as the number of layers of the multi-graph increases. We derive sufficient conditions for consistency of both estimators and propose a variational approximation to the MLE that is computationally feasible for large networks. We verify the sufficient conditions via simulation and demonstrate that they are practical. In addition, we apply the model to two real data sets: a dynamic social network and a multi-layer social network with several types of relations.
description: To appear at ICML 2015
30 years in: Quo vadis generalized uncertainty principle?
Creators: name: Bosso, Pasquale
name: Luciano, Giuseppe Gaetano
name: Petruzziello, Luciano
name: Wagner, Fabian
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: According to a number of arguments in quantum gravity, both model-dependent and model-independent, Heisenberg's uncertainty principle is modified when approaching the Planck scale. This deformation is attributed to the existence of a minimal length. The ensuing models have found entry into the literature under the term Generalized Uncertainty Principle (GUP). In this work, we discuss several conceptual shortcomings of the underlying framework and critically review recent developments in the field. In particular, we touch upon the issues of relativistic and field theoretical generalizations, the classical limit and the application to composite systems. Furthermore, we comment on subtleties involving the use of heuristic arguments instead of explicit calculations. Finally, we present an extensive list of constraints on the model parameter $β$, classifying them on the basis of the degree of rigour in their derivation and reconsidering the ones subject to problems associated with composites.
description: 38 pages. Accepted for publication in Classical and Quantum Gravity, "Special Issue: Focus on Quantum Gravity Phenomenology in the Multi-Messenger Era: Challenges and Perspectives"
Tercera herramienta ortográfica ¿Qué es el estilo?
Creators: name: Criales Cárdenas Diana Patricia
Publisher: name: Universidad del Rosario
Year: 2022

description: Documento del mooc Corrección de textos jurídicos dondese  analiza cómo el estilo puede ayudar en la construcción de textos gramaticales, para ello se debe tener presente que es necesario organizar las oraciones en voz activa y posteriormente ubicar los circunstanciales según se quiera influir en el lector.
On a model for phase separation in binary alloys driven by mechanical effects
Creators: name: Bonetti, Elena
name: Colli, Pierluigi
name: Dreyer, Wolfgang
name: Gilardi, Gianni
name: Schimperna, Giulio
name: Sprekels, Jürgen
Publisher: name: Weierstrass Institute
Year: 2001
Subjects: subject: Free boundary value problems
subject: phase-field models
subject: phase transitions in mechanical stress fields
subject: a priori estimates
subject: existence
subject: uniqueness
subject: 35K45
subject: 35K50
subject: 74N15
subject: 74N20
subject: 74N25
subject: 74M25

description: This work is concerned with the mathematical analysis of a system of partial differential equations modeling the effect of phase separation driven by mechanical actions in binary alloys like tin/lead solders. The system combines the (quasistationary) balance of linear momentum with a fourth order evolution equation of Cahn_Hilliard type for the phase separation, and it is highly nonlinearly coupled. Existence and uniqueness results are shown.
Topological photonics: fundamental concepts, recent developments, and future directions
Creators: name: Mehrabad, Mahmoud Jalali
name: Mittal, Sunil
name: Hafezi, Mohammad
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Topological photonics is emerging as a new paradigm for the development of both classical and quantum photonic architectures. What makes topological photonics remarkably intriguing is the built-in protection as well as intrinsic unidirectionality of light propagation, which originates from the robustness of global topological invariants. In this Perspective, we present an intuitive and concise pedagogical overview of fundamental concepts in topological photonics. Then, we review the recent developments of the main activity areas of this field, categorized into linear, nonlinear, and quantum regimes. For each section, we discuss both current and potential future directions, as well as remaining challenges and elusive questions regarding the implementation of topological ideas in photonics systems.
Discrete-time Quantum Walks in random artificial Gauge Fields
Creators: name: Di Molfetta, G.
name: Debbasch, F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Discrete-time quantum walks (DTQWs) in random artificial electric and gravitational fields are studied analytically and numerically. The analytical computations are carried by a new method which allows a direct exact analytical determination of the equations of motion obeyed by the average density operator. It is proven that randomness induces decoherence and that the quantum walks behave asymptotically like classical random walks. Asymptotic diffusion coefficients are computed exactly. The continuous limit is also obtained and discussed.
description: 16 pages, 9 figures. Submitted to Physica A
Cualidades del cuerpo, respiración y relajación
Creators: name: Montaña, Luis Eduardo
Publisher: name: Universidad del Rosario
Year: 2022

description: Documento perteneciente al mooc Comunicación oral en entornos jurídicos en el cual se explican cuáles son las cualidades del cuerpo, la respiración y relación en el contexto de la comunicacón oral.
Self-organised criticality in stochastic sandpiles: Connection to directed percolation
Creators: name: Basu, U.
name: Mohanty, P. K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We introduce a stochastic sandpile model where finite drive and dissipation are coupled to the activity field. The absorbing phase transition here, as expected, belongs to the directed percolation (DP) universality class. We focus on the small drive and dissipation limit, i.e. the so-called self-organised critical (SOC) regime and show that the system exhibits a crossover from ordinary DP scaling to a dissipation-controlled scaling which is independent of the underlying dynamics or spatial dimension. The new scaling regime continues all the way to the zero bulk drive limit suggesting that the corresponding SOC behaviour is only DP, modified by the dissipation-controlled scaling. We demonstrate this for the continuous and discrete Manna model driven by noise and bulk dissipation.
description: 6 pages, 6 figures (request author for Supplemental material)
title: Dolmetscher/innen in der NS-Zeit
Creators: name: Cocchis, Miranda
Year: 2022

description: Während der Zeit des Nationalsozialismus in Europa waren Dolmetscher*innen grundlegend für die Verständigung zwischen verschiedenen Ländern in Krisensituationen. Dolmetscher*innen wurden vielseitig eingesetzt, etwa in Konzentrationslagern, beim Militär oder auf diplomatischer Ebene. In dieser Masterarbeit werden alle genannten Einsatzgebiete berücksichtigt, wobei der Schwerpunkt auf Dolmetscher*innen in Politik und Diplomatie liegt und insbesondere die Fallstudien von Eugen Dollmann und Paul Schmidt, die Adolf Hitler dolmetschten, analysiert werden. Anhand einer qualitativen Analyse nach Mayring (2015) werden die folgenden Forschungsfragen beantwortet: Haben Dollmann und Schmidt eine (berufs-)ethische Haltung ein-genommen? Hatten Dollmann und Schmidt einen bestimmten Verhaltenskodex, den sie befolgen konnten? Welchen Handlungsspielraum hatten Dollmann und Schmidt als Dolmetscher? Zur Durchführung der qualitativen Analyse wird die Methode der Explikation von Text-stellen aus den Memoiren von Dollmann und Schmidt angewandt, wobei insbesondere die Werke Roma nazista (Dollmann 1949), Hitler’s Interpreter (Schmidt 2016) und Statist auf diplomatischer Bühne 1923-1945: Erlebnisse des Chefdolmetschers im Auswärtigen Amt mit den Staatsmännern Europas (Schmidt 1949) berücksichtigt werden. Die Analyse zeigt, dass es unmöglich ist, festzustellen, ob Dollmann und Schmidt die nationalsozialistische Ideologie tatsächlich unterstützten, da es sich bei den verfügbaren Quellen um Memoiren handelt und nicht bekannt ist, ob die Inhalte der Wahrheit entsprechen oder lediglich als Rechtfertigung der Dolmetscher betrachtet werden können. Es ist jedoch klar, dass beide Dolmetscher auf unterschiedliche Weise Wege gefunden haben, um Diktatoren zu manipulieren. Deshalb kann von einer (berufs-)ethischen Haltung nicht gesprochen werden. Die Analyse verdeutlicht außerdem, dass Dollmann und Schmidt einen persönlichen Verhaltenskodex hatten, der jedoch stark durch den Indoktrinierungsprozess beeinflusst wurde. Darüber hinaus hatten Dollmann und Schmidt einen weiten Handlungsspielraum, da beide je nach Situation unterschiedliche Rollen übernahmen, in manchen Fällen agierten sie etwa als Berater und nicht nur als Dolmetscher. Außerdem hatten sie einen großen Freiraum bei der Ausübung ihrer Macht.
Majorana fermions in ferromagnetic chains on the surface of bulk spin-orbit coupled $s$-wave superconductors
Creators: name: Hui, Hoi-Yin
name: Brydon, P. M. R.
name: Sau, Jay D.
name: Tewari, S.
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Majorana fermion (MF) excitations in solid state system have non-Abelian statistics which is essential for topological quantum computation. Previous proposals to realize MF, however, generally requires fine-tuning of parameters. Here we explore a platform which avoids the fine-tuning problem, namely a ferromagnetic chain deposited on the surface of a spin-orbit coupled $s$-wave superconductor. We show that it generically supports zero-energy topological MF excitations near the two ends of the chain with minimal fine-tuning. Depending on the strength of the ferromagnetic moment in the chain, the number of MFs at each end, $n$, can be either one or two, and should be revealed by a robust zero-bias peak (ZBP) of height $2ne^2/h$ in scanning tunneling microscopy (STM) measurements which would show strong (weak) signals at the ends (middle) of the chain. The role of an approximate chiral symmetry which gives an integer topological invariant to the system is discussed.
description: 9 pages, 4 figures
Indirect Probes of Dark Matter and Globular Cluster Properties From Dark Matter Annihilation within the Coolest White Dwarfs
Creators: name: Hurst, Travis J.
name: Zentner, Andrew R.
name: Natarajan, Aravind
name: Badenes, Carles
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: White Dwarfs (WD) capture Dark Matter (DM) as they orbit within their host halos. These captured particles may subsequently annihilate, heating the stellar core and preventing the WD from cooling. The potential wells of WDs are considerably deeper and core temperatures significantly cooler than those of main sequence stars. Consequently, DM evaporation is less important in WDs and DM with masses $M_χ \gtrsim 100\, \kev$ and annihilation cross-sections orders of magnitude below the canonical thermal cross-section ($\sigmav \gtrsim 10^{-46}\, \cm^3$/s) can significantly alter WD cooling in particular astrophysical environments. We consider WDs in globular clusters (GCs) and dwarf galaxies. If the parameters of the DM particle are known, then the temperature of the coolest WD in a GC can be used to constrain the DM density of the cluster's halo (potentially even ruling out the presence of a halo if the inferred density is of order the ambient Galactic density). Recently several direct detection experiments have seen signals whose origins might be due to low mass DM. In this paper, we show that if these claims from CRESST, DAMA, CDMS-Si, and CoGeNT could be interpreted as DM, then observations of NGC 6397 limit the fraction of DM in that cluster to be $f_{\mathrm{DM}} \lesssim 10^{-3}$. This would be an improvement over existing constraints of 3 orders of magnitude and clearly rule out a significant DM halo for this cluster...
description: 13 pages, 7 figures
Structured inverse modeling in parabolic diffusion processess
Creators: name: Schulz, Volker
name: Siebenborn, Martin
name: Welker, Kathrin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: Often, the unknown diffusivity in diffusive processes is structured by piecewise constant patches. This paper is devoted to efficient methods for the determination of such structured diffusion parameters by exploiting shape calculus. A novel shape gradient is derived in parabolic processes. Furthermore quasi-Newton techniques are used in order to accelerate shape gradient based iterations in shape space. Numerical investigations support the theoretical results.
description: 19 pages, 6 figures
5IDER: Unified Query Rewriting for Steering, Intent Carryover, Disfluencies, Entity Carryover and Repair
Creators: name: Lu, Jiarui
name: Tseng, Bo-Hsiang
name: Moniz, Joel Ruben Antony
name: Li, Site
name: Zhu, Xueyun
name: Yu, Hong
name: Akbacak, Murat
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Providing voice assistants the ability to navigate multi-turn conversations is a challenging problem. Handling multi-turn interactions requires the system to understand various conversational use-cases, such as steering, intent carryover, disfluencies, entity carryover, and repair. The complexity of this problem is compounded by the fact that these use-cases mix with each other, often appearing simultaneously in natural language. This work proposes a non-autoregressive query rewriting architecture that can handle not only the five aforementioned tasks, but also complex compositions of these use-cases. We show that our proposed model has competitive single task performance compared to the baseline approach, and even outperforms a fine-tuned T5 model in use-case compositions, despite being 15 times smaller in parameters and 25 times faster in latency.
description: Interspeech 2023
Long-Time Asymptotics for the Defocusing Integrable Discrete Nonlinear Schrödinger Equation II
Creators: name: Yamane, Hideshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: Primary 35Q55, Secondary 35Q15

description: We investigate the long-time asymptotics for the defocusing integrable discrete nonlinear Schrödinger equation. If $|n|<2t$, we have decaying oscillation of order $O(t^{-1/2})$ as was proved in our previous paper. Near $|n|=2t$, the behavior is decaying oscillation of order $O(t^{-1/3})$ and the coefficient of the leading term is expressed by the Painlevé II function. In $|n|>2t$, the solution decays more rapidly than any negative power of $n$.
El ser, el sentir, el saber y el expresarse
Creators: name: Montaña, Luis Eduardo
Publisher: name: Universidad del Rosario
Year: 2022

description: Documento perteneciente al mooc Comunicación oral en entornos jurídicos en el analizan tres variables que pueden ayudar a mejorar la comunicación oral y cómo a partir de estas se puede trabajar desde lo que somos, sentimos, sabemos y expresamos.
A quadrature algorithm for wavelet Galerkin methods
Creators: name: Rathsfeld, Andreas
Publisher: name: Weierstrass Institute
Year: 2001
Subjects: subject: wavelet Galerkin methods
subject: first kind integral operator
subject: quadrature algorithm
subject: 65N38
subject: 65T60
subject: 65R20
subject: 65D30

description: We consider the wavelet Galerkin method for the solution of boundary integral equations of the first and second kind including integral operators of order r less than zero. This is supposed to be based on an abstract wavelet basis which spans piecewise polynomials of order dT. For example, the bases can be chosen as the basis of tensor product interval wavelets defined over a set of parametrization patches. We define and analyze a quadrature algorithm for the wavelet Galerkin method which utilizes Smolyak quadrature rules of finite order. In particular, we prove that quadrature rules of an order larger than 2dT - r are sufficient to compose a quadrature algorithm for the wavelet Galerkin scheme such that the compressed and quadrature approximated method converges with the maximal order 2dT - r and such that the number of necessary arithmetic operations is less than 풪(N log N) with N the number of degrees of freedom. For the estimates, a degree of smoothness greater or equal to 2[2dT - r]+1 is needed.
Η «μετάφρασις» του Ακαθίστου ύμνου του Μανουήλ Φιλή
Creators: name: Νίκου, Δημήτριος
Publisher: name: ΠΑΡΕΚΒΟΛΑΙ
Year: 2024
Subjects: Μανουήλ Φιλής, Ακάθιστος ύμνος

description: This article presents a new critical edition of the metrical Metaphrasis of the Akathist hymn by the most prolific poet of the Palaeologan period, Manuel Philes, based on all the codices preserving the work (14 in all). It also attempts a systematic study of the poet’s metaphrastic technique and a metrical analysis of the poem.
description: ΠΑΡΕΚΒΟΛΑΙ, Vol 14 (2024)
Generalized Teacher Forcing for Learning Chaotic Dynamics
Creators: name: Hess, Florian
name: Monfared, Zahra
name: Brenner, Manuel
name: Durstewitz, Daniel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Chaotic dynamical systems (DS) are ubiquitous in nature and society. Often we are interested in reconstructing such systems from observed time series for prediction or mechanistic insight, where by reconstruction we mean learning geometrical and invariant temporal properties of the system in question (like attractors). However, training reconstruction algorithms like recurrent neural networks (RNNs) on such systems by gradient-descent based techniques faces severe challenges. This is mainly due to exploding gradients caused by the exponential divergence of trajectories in chaotic systems. Moreover, for (scientific) interpretability we wish to have as low dimensional reconstructions as possible, preferably in a model which is mathematically tractable. Here we report that a surprisingly simple modification of teacher forcing leads to provably strictly all-time bounded gradients in training on chaotic systems, and, when paired with a simple architectural rearrangement of a tractable RNN design, piecewise-linear RNNs (PLRNNs), allows for faithful reconstruction in spaces of at most the dimensionality of the observed system. We show on several DS that with these amendments we can reconstruct DS better than current SOTA algorithms, in much lower dimensions. Performance differences were particularly compelling on real world data with which most other methods severely struggled. This work thus led to a simple yet powerful DS reconstruction algorithm which is highly interpretable at the same time.
description: Published in the Proceedings of the 40th International Conference on Machine Learning (ICML 2023)
Las versalitas
Creators: name: Criales Cárdenas Diana Patricia
Publisher: name: Universidad del Rosario
Year: 2022

description: Recurso audiovisual del mooc Corrección de textos jurídicos  en el cual se analizan aspectos relevantes sobre las versalitas, se explica qué son las versalitas y cómo se pueden emplear en los escritos jurídicos.
Αποσπάσματα της Πανοπλίας Δογματικῆς στον κώδικα Parisinus graecus 1310
Creators: name: Samara, Demetra
Publisher: name: ΠΑΡΕΚΒΟΛΑΙ
Year: 2024
Subjects: Codex Par. gr. 1310; Dionysius Areopagites; Maximus the Confessor; Eythumius Zigabenus; Panoplia Dogmatica

description: Codex Parisinus graecus 1310 dated to the 15th century preserves in folios 217r-220v the number of 28 excerpts apparently coming from the dogmatic works of Dionysius Areopagites and Maximus the Confessor. The article aims to prove that these excerpts are mostly taken from Panoplia Dogmatica by Eythumius Zigabenus and compares them to the original text. It also points out some noteworthy insertions of passages attributed to different authors.
description: ΠΑΡΕΚΒΟΛΑΙ, Vol 14 (2024)
Effect of weekly and twice weekly iron supplementation on maternal iron status during pregnancy in areas endemic of Helminthic infections
Creators: name: , Peña-Rosas
Publisher: name: Zenodo
Year: 1998

description: Iron deficiency and its consequent anaemia are recognised as the most prevalent specific nutrient deficiency in the world. It is estimated that about 2.15 billion people are iron deficient (Maternal Health and Safe Motherhood and Nutrition Programmes, 1992) and that this deficiency is severe enough to cause anaemia in 1.2 billion people globally (Viteri, 1994b). About 90% of all anaemias are due to lack of iron, affecting mostly the developing world where nearly 1/3 of the population is iron deficient (Cook et al. 1994). Among healthy human beings, pregnant women and rapidly growing infants are the most vulnerable to an iron deficiency under ordinary dietary circumstances. During pregnancy, more iron is needed primarily to supply the growing fetus and placenta and to increase the maternal red cell mass (Institute of Medicine, 1990). Iron deficiency and anaemia during pregnancy are associated with a higher risk of maternal death during the perinatal period (WHO, 1962), preterm delivery (Scholl et al. 1992), impaired cell-mediated immunity (Prema et al. 1982; Kandoi et al. 1991) and unfavourable pregnancy outcomes (Gam et al. 1981; Murphy et al. 1986). Iron deficiency anaemia during pregnancy may result from dietary iron deficiency, poor absorption and utilisation, increased losses or increased requirements.
Genuine Multipartite Entanglement without Multipartite Correlations
Creators: name: Schwemmer, Christian
name: Knips, Lukas
name: Tran, Minh Cong
name: de Rosier, Anna
name: Laskowski, Wieslaw
name: Paterek, Tomasz
name: Weinfurter, Harald
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-classical correlations between measurement results make entanglement the essence of quantum physics and the main resource for quantum information applications. Surprisingly, there are $n$-particle states which do not exhibit $n$-partite correlations at all but still are genuinely $n$-partite entangled. We introduce a general construction principle for such states, implement them in a multiphoton experiment and analyze their properties in detail. Remarkably, even without $n$-partite correlations, these states do violate Bell inequalities showing that there is no classical, i.e., local realistic model describing their properties.
description: 13 pages, 10 figures
Precisión, claridad y coherencia
Creators: name: Criales Cárdenas Diana Patricia
Publisher: name: Universidad del Rosario
Year: 2022

description: Recurso audiovisual del mooc Corrección de textos jurídicos en el cual se explica la importancia de ser claros en la exposición de ideas o argumentos, que dichas estructuras sean precisas y no repitan las ideas y finalmente que sean coherentes
Nonlocality of the energy density for all single-photon states
Creators: name: Federico, Maxime
name: Jauslin, Hans-Rudolf
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The nonlocality of single-photon states has been analyzed from several different but interrelared perspectives. In this article, we propose a demonstration based on the electromagnetic energy density observable and on the anti-local property of the frequency operator $Ω=c(-Δ)^{1/2}$. The present proof is based on the standard quantization of the electromagnetic field, which can be formulated equivalently in the momentum representations or in the position representations of Landau and Peierls [Z. Phys. {\bf 62}, 188 (1930)] and of Białynicki-Birula [\textit{Progress in Optics}, edited by E. Wolf (Elsevier, Amsterdam, 1996)]. Our proof extends to all single-photon states the results of Białynicki-Birula, which were formulated for two particular classes of states, those involving a uniform localization [Phys. Rev. Lett. {\bf80}, 5247 (1998)] or alternatively states that are electrically or magnetically localized [Phys.Rev. A {\bf79}, 032112 (2009)]. Our approach is formulated in terms of Knight's definition of strict localization [J. Math. Phys. {\bf 2}, 459 (1961)], based on the comparison of expectation values of single-photon states of local observables with those of the vacuum.
The Fortuitous Latitude of the Pierre Auger Observatory and Telescope Array for Reconstructing the Quadrupole Moment
Creators: name: Denton, Peter B.
name: Weiler, Thomas J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Determining anisotropies in the arrival directions of cosmic rays at the highest energy is an important task in astrophysics. It is common and useful to partition the sky into spherical harmonics as a measure of anisotropy. The two lowest nontrivial spherical harmonics, the dipole and the quadrupole, are of particular interest, since these distributions encapsulate a dominant single source and a plane of sources, as well as offering relatively high statistics. The best experiments for the detection of ultra high energy cosmic rays currently are all ground-based, with highly nonuniform exposures on the sky resulting from the fixed experimental locations on the earth. This nonuniform exposure increases the complexity and error in inferring anisotropies. It turns out that there is an optimal latitude for an experiment at which nonuniform exposure does not diminish the inference of the quadrupole moment. We derive the optimal latitude, and find that (presumably by a fortuitous coincidence) this optimal latitude runs through the largest cosmic ray experiment, Pierre Auger Observatory (PAO) in the Southern Hemisphere, and close to the largest cosmic ray experiment in the Northern Hemisphere, Telescope Array (TA). Consequently, assuming a quadrupole distribution, PAO and TA can reconstruct the cosmic ray quadrupole distribution to a high precision, without concern for their partial sky exposure.
description: Matches version published in the Astrophysical Journal
Waste studies' insight into orbital debris : a United Arab Emirates case study
Creators: name: Goessler, Alyssa
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Space policy
Space sustainability
Orbital debris
Waste studies
United Arab Emirates
Space law
Middle East

description: The proliferation of orbital debris is on track to develop into a tragedy of the commons. This debris poses a conundrum from the political perspective, as international law provides that no state may make a territorial claim to outer space, including celestial bodies. The growing presence of non-state actors in space adds to this complexity. Humans’ ability to fathom the consequences of orbital debris is plagued by the same spatial and temporal biases that affect our understanding of waste on Earth. The field of waste studies—a discipline that assesses waste as a political material—offers valuable insight into the societal and individual perceptions that sustain the proliferation of space junk. It further illustrates how waste can evolve into a diagnostic on the quality of governance, as the ability of a government to manage garbage is one measure of a government’s legitimacy. Chapter one of this thesis draws insight from the discipline of waste studies to explore the political character of space junk. Chapter two serves as a primer on orbital debris, exploring the technical characteristics that help policymakers best understand the phenomenon. It also provides an overview of the legal landscape of orbital debris, identifying some of the key challenges that states face in addressing the problem. Chapter three builds off of this knowledge, applying the framework outlined in chapter one to a prominent emerging spacefaring nation: the United Arab Emirates. After describing the central geopolitical motivations of that nation’s space program, the chapter explores the UAE’s approach to space sustainability and its comments on orbital debris. By assessing the state’s political goals in space with an emphasis on their approach to space sustainability, this chapter provides important insight to the future of the space sustainability agenda. The concluding “futures and findings” section analyzes the results of that case study, suggesting steps that could be taken to fine tune the theoretical model and augment its value. It also presents specific policy implications, suggesting some possible components of a framework on orbital debris, and discussing the role of emerging spacefaring nations in the space sustainability agenda.
Lipschitz retraction of finite subsets of Hilbert spaces
Creators: name: Kovalev, Leonid V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: Primary 54E40, Secondary 54B20, 54C15, 54C25

description: Finite subset spaces of a metric space $X$ form a nested sequence under natural isometric embeddings $X=X(1)\subset X(2)\subset\dots$. We prove that this sequence admits Lipschitz retractions $X(n)\to X(n-1)$ when $X$ is a Hilbert space.
description: Specializes the result from v1 to Hilbert spaces. The problem remains open for general Hadamard spaces
Automatic Generation of Accurate and Cost-efficient Auxiliary Basis Sets
Creators: name: Lehtola, Susi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We have recently discussed an algorithm to automatically generate auxiliary basis sets (ABSs) of the standard form for density fitting (DF) or resolution-of-the-identity (RI) calculations in a given atomic orbital basis set (OBS) of any form [J. Chem. Theory Comput. 2021, 17, 6886]. In this work, we study two ways to reduce the cost of such automatically generated ABSs without sacrificing their accuracy. We contract the ABS with a singular value decomposition proposed by Kállay [J. Chem. Phys. 2014, 141, 244113], used here in a somewhat different setting. We also drop the high-angular momentum functions from the ABS, as they are unnecessary for global fitting methods. Studying the effect of these two types of truncations on Hartree--Fock (HF) and second-order Møller--Plesset perturbation theory (MP2) calculations on a chemically diverse set of first- and second-row molecules within the RI/DF approach, we show that accurate total and atomization energies can be achieved by a combination of the two approaches with significant reductions in the size of the ABS. While the original approach yields ABSs whose number of functions $N_{\text{bf}}^{\text{ABS}}$ scales with the number of functions in the OBS, $N_{\text{OBS}}^{\text{bf}}$, as $N_{\text{ABS}}^{\text{bf}}=γN_{\text{OBS}}^{\text{bf}}$ with the prefactor $γ\approx\mathcal{O}(10)$, the reduction schemes of this work afford results of essentially the same quality as the original unpruned and uncontracted ABS with $γ\approx5\text{-}6$, while an accuracy that may suffice for routine applications is achievable with a further reduced ABS with $γ\approx3\text{-}4$. The observed errors are similar at HF and MP2 levels of theory, suggesting that the generated ABSs are highly transferable, and can also be applied to model challenging properties with high-level methods.
description: 20 pages, 6 figures
On the Inverse Scattering Method for Integrable PDEs on a Star Graph
Creators: name: Caudrelier, Vincent
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Analysis of PDEs (math.AP)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We present a framework to solve the open problem of formulating the inverse scattering method (ISM) for an integrable PDE on a star-graph. The idea is to map the problem on the graph to a matrix initial-boundary value (IBV) problem and then to extend the unified method of Fokas to such a matrix IBV problem. The nonlinear Schrödinger equation is chosen to illustrate the method. The framework unifies all previously known examples which are recovered as particular cases. The case of general Robin conditions at the vertex is discussed: the notion of linearizable initial-boundary conditions is introduced. For such conditions, the method is shown to be as efficient as the ISM on the full-line.
description: 26 pages, final version. v2: Summary of results in introduction, new section 4.3 to improve the discussion on the global relation, complete discussion of the example in Section 5.1.1. v3: titles of references added
Minimal Model of Stochastic Athermal Systems: Origin of Non-Gaussian Noise
Creators: name: Kanazawa, Kiyoshi
name: Sano, Tomohiko G.
name: Sagawa, Takahiro
name: Hayakawa, Hisao
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: For a wide class of stochastic athermal systems, we derive Langevin-like equations driven by non-Gaussian noise, starting from master equations and developing a new asymptotic expansion. We found an explicit condition whereby the non-Gaussian properties of the athermal noise become dominant for tracer particles associated with both thermal and athermal environments. Furthermore, we derive an inverse formula to infer microscopic properties of the athermal bath from the statistics of the tracer particle. We apply our formulation to a granular motor under viscous friction, and analytically obtain the angular velocity distribution function. Our theory demonstrates that the non-Gaussian Langevin equation is the minimal model of athermal systems.
description: 10 pages, 5 figures
Tipografía: cursivas
Creators: name: Criales Cárdenas Diana Patricia
Publisher: name: Universidad del Rosario
Year: 2022

description: Recurso audiovisual del mooc Corrección de textos jurídicos  en el cual se presentan algunas características esenciales sobre esta tipografía, para conocer cuándo y bajo qué circunstancias es bueno utilizar las cursivas.
The effect of additive noise on dynamical hysteresis
Creators: name: Berglund, Nils
name: Gentz, Barbara
Publisher: name: Weierstrass Institute
Year: 2001
Subjects: subject: dynamical systems
subject: singular perturbations
subject: hysteresis cycles
subject: scaling laws
subject: non-autonomous stochastic differential equations
subject: double-well potential
subject: pathwise description
subject: concentration of measure
subject: 37H20
subject: 60H10
subject: 34C55
subject: 34E15
subject: 82C31

description: We investigate the properties of hysteresis cycles produced by a one-dimensional, periodically forced Langevin equation. We show that depending on amplitude and frequency of the forcing and on noise intensity, there are three qualitatively different types of hysteresis cycles. Below a critical noise intensity, the random area enclosed by hysteresis cycles is concentrated near the deterministic area, which is different for small and large driving amplitude. Above this threshold, the area of typical hysteresis cycles depends, to leading order, only on the noise intensity. In all three regimes, we derive mathematically rigorous estimates for expectation, variance, and the probability of deviations of the hysteresis area from its typical value.
Correct voltage distribution for axisymmetric sinusoidal modeling of induction heating with prescribed current, voltage, or power
Creators: name: Klein, Olaf
name: Philip, Peter
Publisher: name: Weierstrass Institute
Year: 2001
Subjects: subject: Sinusoidal induction heating
subject: axisymmetric modeling
subject: voltage distribution
subject: numerical simulation
subject: 78A25
subject: 65Z05
subject: 84.32.Hh
subject: 02.60.Cb

description: We consider the problem of determining the voltage in coil rings, which arise as an axisymmetric approximation of a single connected induction coil during modeling of induction heating. Assuming axisymmetric electromagnetic fields with sinusoidal time dependence, the voltages are computed from the condition that the total current must be equal in each ring. Depending on which of the quantities total current, total voltage, or total power is to be prescribed, the ring voltages are given by different linear systems of complex equations. In two sets of numerical simulations, varying the number of coil rings, we compare results using the correct voltage distribution to the corresponding results using the simple homogeneous voltage distribution.