cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The spin evolution of neutron stars with the superfluid core
Creators: name: Barsukov, D. P.
name: Goglichidze, O. A.
name: Tsygan, A. I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We investigate the neutron stars spin evolution (breaking, inclination angle evolution and radiative precession), taking into account the superfluidity of the neutrons in the star core. The neutron star is treated as a two-component system consisting of a "charged" component (including the crust and the core protons, electrons and normal neutrons) and a core superfluid neutron component. The components are supposed to interact through the mutual friction force. We assume that the "charged" component rotates rigidly. The neutron superfluid velocity field is calculated directly from linearized hydrodynamical equations. It is shown that the superfluid core accelerates the evolution of inclinaton angle and makes all pulsars evolve to either orthogonal or coaxial state. However, rapid evolution seems to contradict the observation data. Obtained results together with the observations may allow to examine the superfluid models.
description: 11 pages, 5figures, accepted in MNRAS
Le voyage hippie, hier et aujord'hui
Creators: name: Monneyron, Frédéric
name: Xiberras, Martine
Publisher: name: ECHO
Year: 2022
Subjects: Imaginary; hippy; counter-culture; travel; tourism; Imaginaire; hippy; contre-culture; voyage; tourisme

description: The hippie journey concentrates and summarizes the hippie philosophy and way of life. Several well-known mottos, such as "make love, not war", or "go through the doors of perception", describe the initiatory forms and social functions of travel reinvented by hippie communities. Although the emblematic destinations of hippie travel still exist, the aura of the "inner journey" or the "mythical Orient" persist only as pale reflections or clichés for mass tourism. Le voyage hippie concentre et résume la philosophie ainsi que le mode de vie hippie. Plusieurs devises bien connues comme « make love, not war », ou « franchir les portes de la perception », permettent de décrire les formes initiatiques et les fonctions de socialité du voyage réinventées par les communautés hippies. Cependant, si les destinations emblématiques du voyage hippie demeurent encore aujourd’hui, l’aura du « voyage intérieur » ou des « Orients mythiques » ne persistent que comme de pâles reflets ou des clichés pour un tourisme de masse.
description: ECHO, N. 4 (2022): Metafore del viaggio: testi, identità, generi in movimento
On an algorithm for multiperiodic words
Creators: name: Holub, Štěpán
Publisher: name: arXiv
Year: 2012
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 68R15

description: We consider an algorithm by Tijdeman and Zamboni constructing a word of a given length that has a given set of periods, and the richest possible alphabet. We show that this algorithm can be easily stated and its correctness briefly proved using the class equivalence approach.
description: changes in the introduction, missing references added
Du moderne en Corée: l'écriture, la colonisation, le destin
Creators: name: Gaudin, Christophe
Publisher: name: ECHO
Year: 2022
Subjects: Modernity; Asia; South Korea; Colonization; Democracy; Hallyu; Modernité; Asie; Corée du Sud; Colonisation; Démocratie; Hallyu

description: This study aims to elucidate in three stages how Western modernity has spread in South Korea. It opens first with a philological approach, emphasizing the gradual shift between using ideograms and an alphabet-based writing system. It then examines the impact of Japanese colonization. Lastly, the study concludes with the very translation of the concept of what “modern” means in Korean, focusing on political and cultural spheres. Cette étude vise à poser trois grands jalons pour comprendre comment la modernité occidentale a essaimé en Corée du Sud. Elle s’ouvre sur une première partie plus philologique, en prenant l’exemple du basculement progressif entre les idéogrammes et une écriture alphabétique. Elle questionne ensuite le rôle de la colonisation japonaise. Elle se conclut sur la traduction même du concept de « moderne » en coréen, notamment dans les sphères politique et culturelle.
description: ECHO, N. 4 (2022): Metafore del viaggio: testi, identità, generi in movimento
Periodic spatial variation of the electron-phonon interaction in epitaxial graphene on Ru(0001
Creators: name: Castellanos-Gomez, Andres
name: Rubio-Bollinger, Gabino
name: Barja, Sara
name: Garnica, Manuela
name: de Parga, Amadeo L. Vázquez
name: Miranda, Rodolfo
name: Agraït, Nicolás
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have performed low temperature scanning tunnelling spectroscopy (STS) measurements on graphene epitaxially grown on Ru(0001). An inelastic feature, related to the excitation of a vibrational breathing mode of the graphene lattice, was found at 360 meV. The change in the differential electrical conductance produced by this inelastic feature, which is associated with the electron-phonon interaction strength, varies spatially from one position to other of the graphene supercell. This inhomogeneity in the electronic properties of graphene on Ru(0001) results from local variations of the carbon-ruthenium interaction due to the lattice mismatch between the graphene and the Ru(0001) lattices.
description: 6 Pages, 3 figures
title: On the preconditioning for weak constraint four-dimensional variational data assimilation
Creators: name: Dauzickaite, Ieva
Publisher: name: University of Reading
Year: 2022

description: Data assimilation is used to obtain an improved estimate (analysis) of the state of a dynamical system by combining a previous estimate with observations of the system. A weak constraint four-dimensional variational assimilation (4D-Var) method accounts for the dynamical model error and is of large interest in numerical weather prediction. The analysis can be approximated by solving a series of large sparse symmetric positive definite (SPD) or saddle point linear systems of equations. The iterative solvers used for these systems require preconditioning for a satisfactory performance. In this thesis, we use randomised numerical methods to construct effective preconditioners that are cheap to construct and apply. We employ a randomised eigenvalue decomposition to construct limited memory preconditioners (LMPs) for a forcing formulation of 4D-Var independently of the previously solved systems. This preconditioning remains effective even if the subsequent systems change significantly. We propose a randomised approximation of a control variable transform technique (CVT) to precondition the SPD system of the state formulation, which preserves potential for a time-parallel model integration. A new way to include the observation information in the approximation of the inverse Schur complement in the block diagonal preconditioner for the saddle point formulations is introduced, namely applying the randomised LMPs. Numerical experiments with idealised systems show that the proposed preconditioners improve the performance of the iterative solvers. We provide theoretical results describing the change of the extreme eigenvalues of the unpreconditioned and preconditioned coefficient matrices when new observations of the dynamical system are added. These show that small positive eigenvalues can cause convergence issues. New eigenvalue bounds for the SPD and saddle point coefficient matrices in the state formulation emphasize their sensitivities to the observations. These results can guide the design of other preconditioners.
Gaussian Vortex Approximation to the Instanton Equations of two-dimensional Turbulence
Creators: name: Kleineberg, Kaj Kolja
name: Friedrich, Rudolf
Publisher: name: arXiv
Year: 2012
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We investigate two-dimensional turbulence within the Instanton formalism which determines the most probable field in a stochastic classical field theory starting from the Martin-Siggia-Rose path integral. We perform an approximate analysis of these equations based on a variational ansatz using elliptical vortices. The result are evolution equations for the positions and the shapes of the vortices. We solve these ordinary differential equations numerically. The extremal action for the two-point statistics is determined by the merging of two elliptical vortices. We discuss the relationship of this dynamical system to the inverse cascade process of two-dimensional turbulence.
Performance of solenoids vs. quadrupoles in focusing and energy selection of laser accelerated protons
Creators: name: Hofmann, Ingo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Medical Physics (physics.med-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Using laser accelerated protons or ions for various applications - for example in particle therapie or short-pulse radiographic diagnostics - requires an effective method of focusing and energy selection. We derive an analytical scaling for the performance of a solenoid compared with a doublet/triplet as function of the energy, which is confirmed by TRACEWIN simulations. The scaling shows that above a few MeV a solenoid needs to be pulsed or super-conducting, whereas the quadrupoles can remain conventional. The transmission of the triplet is found only 25% lower than that of the equivalent solenoid. Both systems are equally suitable for energy selection based on their chromatic effect as is shown using an initial distribution following the RPA simulation model by Yan et al.\cite{yan2009}.
description: Submitted to Phys. Rev. ST Accel. Beams
title: Конструкция и работа систем ABS, ASR, EDS, ESP современного легкового автомобиля
Creators: name: ELS IPR BOOKS
Publisher: name: Ай Пи Ар Медиа
Year: 2023

description: В учебном пособии рассмотрен учебный стенд для изучения работы систем ABS, ASR, EDS, ESP современного легкового автомобиля. Приведено описание устройства и конструктивных особенностей антиблокировочной тормозной системы, системы электронного распределения тормозных усилий, системы электронной блокировки дифференциала, противобуксовочной системы, системы стабилизации курсовой устойчивости. Подготовлено с учетом требований Федерального государственного образовательного стандарта среднего профессионального образования. Учебное пособие может быть использовано студентами, обучающимися по профессии 23.01.17 «Мастер по ремонту и обслуживанию автомобилей» и специальностям 23.02.05 «Эксплуатация транспортного электрооборудования и автоматики (по видам транспорта, за исключением водного)», 23.02.07 «Техническое обслуживание и ремонт двигателей, систем и агрегатов, автомобилей», при изучении дисциплины «Устройство автомобилей».
Villa Lobos (#49)
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2020
Subjects: Music

description: Guests: No guests. Works: Bachiana Brasileira No. 1; Brazilian songs; Bachiana Brasileira No. 5; Dance Piece (Oscar Fernandez); Danza Brazileira (Guarneri); Sensemaya (Revueltas).
Genetic Algorithm with Ensemble Learning for Detecting Community Structure in Complex Networks
Creators: name: He, Dongxiao
name: Wang, Zhe
name: Yang, Bin
name: Zhou, Chunguang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Community detection in complex networks is a topic of considerable recent interest within the scientific community. For dealing with the problem that genetic algorithm are hardly applied to community detection, we propose a genetic algorithm with ensemble learning (GAEL) for detecting community structure in complex networks. GAEL replaces its traditional crossover operator with a multi-individual crossover operator based on ensemble learning. Therefore, GAEL can avoid the problems that are brought by traditional crossover operator which is only able to mix string blocks of different individuals, but not able to recombine clustering contexts of different individuals into new better ones. In addition, the local search strategy, which makes mutated node be placed into the community where most of its neighbors are, is used in mutation operator. At last, a Markov random walk based method is used to initialize population in this paper, and it can provide us a population of accurate and diverse clustering solutions. Those diverse and accurate individuals are suitable for ensemble learning based multi-individual crossover operator. The proposed GAEL is tested on both computer-generated and real-world networks, and compared with current representative algorithms for community detection in complex networks. Experimental results demonstrate that GAEL is highly effective at discovering community structure.
description: 6 pages, 2 figures, 1 table 2009 Fourth International Conference on Computer Sciences and Convergence Information Technology(ICCIT '09)
Pensiero narrativo e apprendimento scolastico: il compito di prestazione
Creators: name: Piccinno, Marco
Publisher: name: ECHO
Year: 2022
Subjects: Explanation; understanding; interpretation; paradigmatic thinking; narrative thinking; spiegazione; comprensione; interpretazione; pensiero paradigmatico; pensiero narrativo

description: This paper explores the structure of the performance task as a suitable methodological framework to promote deep understanding of content. It analyzes its epistemic assumptions - recognizing them in the dynamisms of narrative thinkin (Bruner, 1992) - and its didactic declinations - as they emerge from Ausubel (2004) and Wiggins and McTighe (2004). Il saggio affronta la struttura del compito di prestazione come presidio metodologico idoneo a promuovere la comprensione profonda dei contenuti. Ne analizza i presupposti epistemici - riconoscendoli nei dinamismi del pensiero narrativo (Bruner, 1992) - e le declinazioni didattiche - così come emergono dalle riflessioni dell’Ausubel (2004) e di Wiggins e McTighe (2004) -.
description: ECHO, N. 4 (2022): Metafore del viaggio: testi, identità, generi in movimento
title: Operationalization of automated fault description mappings in quality management systems using the natural language processing neural networks of the BERT language model
Creators: name: Thakre, Urvashi
Publisher: name: Universität Stuttgart
Year: 2025
Subjects: subject: 004

description: The automotive industry has witnessed remarkable technological advancements, leading to innovative approaches in quality management and fault categorization. This thesis focuses on improving the fault categorization process within Mercedes-Benz Operations 360 (MO360) platform by leveraging state-of-the-art transformer models like Bidirectional Encoder Representations from Transformers (BERT) and General Text Embedding (GTE) Large. Through advanced Natural Language Processing (NLP) techniques, the study addresses the challenges of mapping textual feedback to structured fault codes which is a crucial need in automotive production and customer service. The research begins with a thorough exploration of existing literature, highlighting the role of pre-trained language models in customer feedback analysis, fault diagnosis, and semantic text matching. Fine-tuned models are then developed and evaluated, achieving a training accuracy of more than 98%. Their performance is assessed using various metrics, and expert validation gives useful information about the system’s usability, accuracy, and usefulness in real life. These evaluations highlighted the system’s ability to simplify fault categorization while identifying areas for refinement, such as managing rare fault scenarios and ambiguous descriptions. An additional validation process, involving expert-labeled data, further enhanced the models’ accuracy, achieving a top-5 accuracy of 54% and a top-1 accuracy of 30.54%. Looking ahead, the thesis proposes future improvements, including multilingual support, real-time fault categorization, and explainable Artificial Intelligence (AI) features to increase transparency and trust. These findings demonstrate how NLP can significantly enhance quality management in the automotive sector, offering a robust and scalable framework that meets the industry’s evolving needs for precision and customer-focused solutions.
Loop Variables and Gauge Invariant Exact Renormalization Group Equations for Closed String Theory
Creators: name: Sathiapalan, B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We formulate the Exact Renormalization Group on the string world sheet for closed string backgrounds. The same techniques that were used for open strings is used here. There are some subtleties. One is that holomorphic factorization of the closed string vertex operators does not hold in the presence of a cutoff on the Euclidean world sheet. This introduces extra terms in the Lagrangian at the cutoff scale and they turn out to be crucial for implementing gauge invariance. This naive generalization from open string to closed strings requires a {\em massive} graviton and the gauge symmetry is Abelian, just as in open string theory. Interestingly, it turns out that if one introduces a non dynamical background metric (as in background field formalism) and combines a gauge transformation on the field with a transformation on the coordinates and background metric, the graviton can be massless. Some examples of background coordinate covariant equations are worked out explicitly. A preliminary discussion of massive modes, massive gauge transformations and the role of world sheet regulator terms is given. Some of the gauge transformations can be given a geometric meaning if space time is assumed to be complex at some level.
description: 44 pages Latex. Some minor modifications
Tra limite e relazione. Un itinerario verso il riconoscimento, la consapevolezza e la riappropriazione dell'identità personale
Creators: name: Modugno, Alessandra
Publisher: name: ECHO
Year: 2022
Subjects: Care; human identity; limit; path; relationship; cura; identità umana; limite; percorso; relazione

description: This paper aims at exploring the issue of human identity. Although we tend to talk about “liquid identity” or to exclude ontological definitions, the current political, economic and social environment forces us to define a deeper and more objective foundation of human identity. The proposed analysis focuses on the notion of travel as a journey towards a meta-reflection on human existence and experience. Following a semantic and theoretical analysis of the concepts of "limit" and "relation", this paper discusses the existence of an objective and infinite ontological human core, which requires care for the self and towards the other. Il testo intende esplorare la questione dell’identità umana. Benché attualmente si tenda a concepire l’identità in termini “liquidi” o si eviti una concezione specificamente ontologica, gli eventi politici, economici e sociali che stiamo recentemente attraversando impongono di definire una fondazione profonda e oggettiva dell’identità umana. L’esplorazione proposta si concentra sul viaggio come “itinerario” di una meta-riflessione sull’esistenza ed esperienza umana. Mediante l’analisi semantica e teoretica dei concetti di “limite” e “relazione”, il testo argomenta l’esistenza nella natura umana di un nucleo ontologico oggettivo e infinito, che richiede cura di sé e verso l’altro.
description: ECHO, N. 4 (2022): Metafore del viaggio: testi, identità, generi in movimento
Membrane instantons from a semiclassical TBA
Creators: name: Calvo, Flavio
name: Marino, Marcos
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The partition function on the three-sphere of ABJM theory contains non-perturbative corrections which correspond to membrane instantons in M-theory. These corrections can be studied in the Fermi gas approach to the partition function, and they are encoded in a system of integral equations of the TBA type. We study a semiclassical or WKB expansion of this TBA system in the ABJM coupling k, which corresponds to the strong coupling expansion of the type IIA string. This allows us to study membrane instanton corrections in M-theory at high order in the WKB expansion. Using these WKB results, we verify the conjectures for the form of the one-instanton correction at finite k proposed recently by Hatsuda, Moriyama and Okuyama (HMO), which are in turn based on a conjectural cancellation of divergences between worldsheet instantons and membrane instantons. The HMO cancellation mechanism is important since it shows in a precise, quantitative way, that the perturbative genus expansion is radically insufficient at strong coupling, and that non-perturbative membrane effects are essential to make sense of the theory. We propose analytic expressions in k for the full two-membrane instanton correction and for higher-order non-perturbative terms, which pass many consistency checks and provide further evidence for the HMO mechanism.
description: 23 pages, one figure. v2: misprints corrected
Quelleninterpretation zum Thema "Die weiße Bewegung im russischen Bürgerkrieg"
Creators: name: Podolak, Martin
Publisher: name: Zenodo
Year: 2004
Subjects: Russian history, revolution, white movement

description: Quelle aus: Koloskov, Anatolij: Istorija otečestva v dokumentach 1917-1993 gg.. Čast' pervaja 1917-1920 gg.. Chrestomatija dl'a učašichs'a staršich klassov srednej školy.
 Moskva 1994. S. 148f.
Educazione al paesaggio, educazione alla cittadinanza e "storytelling" digitale
Creators: name: De Marco, Elisabetta Lucia
Publisher: name: ECHO
Year: 2022
Subjects: Cultural heritage; participatory culture; storytelling; community sense-making; landscape; patrimonio culturale; cultura partecipativa; narrazione; senso della comunità; paesaggio

description: The inclusion of landscapes in the heritage field is the result of the semantic expansion of heritage that has taken place throughout the 20th Century (Choay 2001). Transmitting the knowledge of landscapes and landscape ecological approaches is a pedagogical challenge. In this article, the landscape, as a manifestation of the bond that exists between a given society and its space, includes its condition of collective space and cultural expression. By combining interactivity, narration, and audiovisual arts, digital storytelling has become the basis for pedagogical strategies that aim to describe the landscape as heritage in order to establish a valuable body of landscape-related knowledge and actively promote citizenship education. L’inclusione del paesaggio nel campo del patrimonio è il risultato del processo di espansione semantica del patrimonio avvenuto nel corso del XX secolo (Choay 2001). La trasmissione della conoscenza dei paesaggi e degli approcci ecologici al paesaggio rappresenta una sfida educativa. In questo articolo il paesaggio, in quanto manifestazione del legame che identifica ogni società con lo spazio in cui si sviluppa, include la sua condizione di spazio collettivo e di espressione culturale. Attraverso la combinazione di interattività, narrazione e arti audiovisive, lo storytelling digitale è diventato la base per percorsi educativi che mirano a comprendere il paesaggio come patrimonio, a generare un prezioso corpo di conoscenze relative al paesaggio e a promuovere l’educazione alla cittadinanza.
description: ECHO, N. 4 (2022): Metafore del viaggio: testi, identità, generi in movimento
Quadrupole transitions in the bound rotational-vibrational spectrum of the deuterium molecular ion
Creators: name: Pilón, Horacio Olivares
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: After the study of the three body molecular system H$_2^+$ ({\it J. Phys. B: At. Mol. Opt. Phys.} {\bf 45} 065101), its isotopomer, the deuterium molecular ion D$_2^+$ is studied. The three-body Schrödinger equation is solved using the Lagrange-mesh method in perimetric coordinates. Energies and wave functions for four vibrational states $v=0-3$ and bound or quasibound states for total orbital momenta from 0 to 56 are calculated. The 1986 fundamental constant $m_d=3670.483014\,m_e$ is used. The obtained energies have an accuracy from about 13 digits for the lowest vibrational state to at least 9 digits for the third vibrational excited state. Quadrupole transition probabilities per time unit between those states over the whole rotational bands were calculated. Extensive results are presented with six significant figures.
description: 19 pages, 5 figures
High-Precision Measurement of Rydberg State Hyperfine Splitting in a Room-Temperature Vapour Cell
Creators: name: Tauschinsky, Atreju
name: Newell, Richard
name: Heuvell, H. B. van Linden van den
name: Spreeuw, R. J. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present direct measurements of the hyperfine splitting of Rydberg states in rubidium 87 using Electromagnetically Induced Transparency (EIT) spectroscopy in a room-temperature vapour cell. With this method, and in spite of Doppler-broadening, line-widths of 3.7 MHz FWHM, i.e. significantly below the intermediate state natural linewidth are reached. This allows resolving hyperfine splittings for Rydberg s-states with n=20...24. With this method we are able to determine Rydberg state hyperfine splittings with an accuracy of approximately 100 kHz. Ultimately our method allows accuracies of order 5 kHz to be reached. Furthermore we present a direct measurement of hyperfine-resolved Rydberg state Stark-shifts. These results will be of great value for future experiments relying on excellent knowledge of Rydberg-state energies and
Death in Tasmania: Using civil death registers to measure nineteenth-century cause-specific mortality
Creators: name: Kippen, Rebecca
Publisher: name: Canberra, ACT : The Australian National University
Year: 2002

description: Studies of nineteenth-century cause-specific mortality date from the nineteenth century itself. Of necessity, most of these studies are based on published cause-of-death data, where causes have already been classified according to some system, rather than data from the original death registers. This thesis investigates nineteenth-century Tasmanian mortality. The main data source for this investigation is a computer database containing individual-level death-registration data for Tasmania from the period 1838-99. Annual life tables are calculated using adjusted census and death registration data. Causes of death are analysed using a new cause-:of-death classification system that combines elements from the Farr system of registration, in use in England and adopted in Tasmania in the nineteenth century, and the latest revision of the International Statistical Classification of Diseases and Related Health Problems. The study seeks to answer the following three questions: How accurately were causes of death registered in nineteenth-century Tasmania? How were causes of death classified in the Statistics of Tasmania? What were the mortality patterns and trends over time in Tasmania and what causes of death resulted in these patterns and trends? The thesis confirms the need for researchers to be aware of the pitfalls of nineteenth century cause-of-death data, while recognising the wealth of information that such data can provide about nineteenth-century causes of death, and perceptions of these causes. The thesis also emphasises the importance of considering changes in mortality over time separately by age. The causes of mortality in infancy, childhood, adulthood and middle and old age were all very different, and calculating just one measure of mortality, such as life expectancy or an age-standardised mortality rate, often masks the very different trends occurring for various life stages.
Correction of inertial navigation system's errors by the help of video-based navigator based on Digital Terrarium Map
Creators: name: Kupervasser, Oleg
name: Rubinstein, Alexander
Publisher: name: arXiv
Year: 2013
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper deals with the error analysis of a novel navigation algorithm that uses as input the sequence of images acquired from a moving camera and a Digital Terrain (or Elevation) Map (DTM/DEM). More specifically, it has been shown that the optical flow derived from two consecutive camera frames can be used in combination with a DTM to estimate the position, orientation and ego-motion parameters of the moving camera. As opposed to previous works, the proposed approach does not require an intermediate explicit reconstruction of the 3D world. In the present work the sensitivity of the algorithm outlined above is studied. The main sources for errors are identified to be the optical-flow evaluation and computation, the quality of the information about the terrain, the structure of the observed terrain and the trajectory of the camera. By assuming appropriate characterization of these error sources, a closed form expression for the uncertainty of the pose and motion of the camera is first developed and then the influence of these factors is confirmed using extensive numerical simulations. The main conclusion of this paper is to establish that the proposed navigation algorithm generates accurate estimates for reasonable scenarios and error sources, and thus can be effectively used as part of a navigation system of autonomous vehicles.
description: 32 pages, 18 figures, Positioning Vol.4 No.1, February 2013. arXiv admin note: substantial text overlap with arXiv:1107.0399, arXiv:1107.1470, arXiv:1106.6341
Universal behavior of two-dimensional bosonic gases at Berezinskii-Kosterlitz-Thouless transitions
Creators: name: Ceccarelli, G.
name: Nespolo, J.
name: Pelissetto, A.
name: Vicari, E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the universal critical behavior of two-dimensional (2D) lattice bosonic gases at the Berezinskii-Kosterlitz-Thouless (BKT) transition, which separates the low-temperature superfluid phase from the high-temperature normal phase. For this purpose, we perform quantum Monte Carlo simulations of the hard-core Bose-Hubbard (BH) model at zero chemical potential. We determine the critical temperature by using a matching method that relates finite-size data for the BH model with corresponding data computed in the classical XY model. In this approach, the neglected scaling corrections decay as inverse powers of the lattice size L, and not as powers of 1/lnL, as in more standard approaches, making the estimate of the critical temperature much more reliable. Then, we consider the BH model in the presence of a trapping harmonic potential, and verify the universality of the trap-size dependence at the BKT critical point. This issue is relevant for experiments with quasi-2D trapped cold atoms.
description: 17 pages, 12 figs, final version
Il viaggio linguistico e interculturale degli studenti in mobilità internazionale per motivi di studio: il "forum online" come strumento di confronto e condivisione
Creators: name: Pontis, Annalisa
Publisher: name: ECHO
Year: 2022
Subjects: Italian as a Second Language; Intercultural Competence; International Mobility; Forum online; Italiano L2; Competenze interculturali; Mobilità internazionale; Forum online

description: The study presents the multilingual perspective of the Common European Framework of Reference (CEFR) for languages and describes the growing student and teacher mobility as one of the main strategies to foster multilingualism and the establishment of European citizenship. Building on these premises, this contribution offers a critical reflection on the ‘studying abroad experience’ which is both a linguistic journey to learn an L2 language (i.e. studying the language and culture of the host country) and a physical journey (i.e. moving to and visiting another place but also living in another country for a short period of time). Therefore, this paper focuses on international mobility as a way to promote diversity, the value of different cultures, and to foster the importance of intercultural communicative competences, and it proposes a methodology to measure these competences during student mobility. Lo studio parte dalla prospettiva plurilinguistica del Quadro Comune Europeo di Riferimento (QCER) per le lingue e dall’incremento della mobilità di studenti e docenti come una delle principali operazioni per favorire il plurilinguismo e la costituzione di una cittadinanza europea. Partendo da queste premesse, questo contributo offre una riflessione critica sullo studiare all’estero poiché si è cercato di considerare che lo studente in mobilità affronta un doppio tipo di viaggio: il percorso alla scoperta di una lingua L2 (che riguarderà lo studio della lingua e della cultura del Paese ospitante) e quello fisico che prevede lo spostamento in un altro luogo (inteso come nuovo spazio da visitare ma anche da vivere e in cui integrarsi per un breve periodo). Questo contributo si concentra sulla mobilità internazionale che permette di educare alla differenza, alla variabilità tra le culture e può favorire la nascita di una competenza comunicativa interculturale e propone strumenti per misurare e osservare questa competenza durante la mobilità degli studenti.
description: ECHO, N. 4 (2022): Metafore del viaggio: testi, identità, generi in movimento
Markov random walk under constraint for discovering overlapping communities in complex networks
Creators: name: Jin, Di
name: Yang, Bo
name: Baquero, Carlos
name: Liu, Dayou
name: He, Dongxiao
name: Liu, Jie
Publisher: name: arXiv
Year: 2013
Subjects: subject: Social and Information Networks (cs.SI)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Detection of overlapping communities in complex networks has motivated recent research in the relevant fields. Aiming this problem, we propose a Markov dynamics based algorithm, called UEOC, which means, 'unfold and extract overlapping communities'. In UEOC, when identifying each natural community that overlaps, a Markov random walk method combined with a constraint strategy, which is based on the corresponding annealed network (degree conserving random network), is performed to unfold the community. Then, a cutoff criterion with the aid of a local community function, called conductance, which can be thought of as the ratio between the number of edges inside the community and those leaving it, is presented to extract this emerged community from the entire network. The UEOC algorithm depends on only one parameter whose value can be easily set, and it requires no prior knowledge on the hidden community structures. The proposed UEOC has been evaluated both on synthetic benchmarks and on some real-world networks, and was compared with a set of competing algorithms. Experimental result has shown that UEOC is highly effective and efficient for discovering overlapping communities.
description: 21 pages, 8 pages, 2 tables
title: Konfiguration algorithmischer Methoden für die Planung von Liniennetzen und Fahrplänen im öffentlichen Verkehr
Creators: name: Migl, Alexander
Publisher: name: Stuttgart : Institut für Straßen- und Verkehrswesen, Universität Stuttgart
Year: 2024
Subjects: subject: 620

description: Ziel der vorliegenden Arbeit ist die algorithmische Erstellung von Liniennetzen, von Fahrplänen und von Umlaufplänen für den ÖV. Dabei geht es nicht um die Neu- oder Weiterentwicklung von Optimierungsverfahren, sondern um die geschickte Nutzung bereits vorhandener Verfahren. Hierfür wird die Open-Source-Bibliothek LINTIM genutzt. Die Eingangsdaten der Verfahren werden so konfiguriert, dass die Ergebnisse möglichst gut planerischen Vorstellungen entsprechen. Planerische Vorstellungen eines Linienkonzepts können beispielsweise ein übersichtliches Netz (wenige lange Linien, statt viele kurze Linien), die Nutzung einer Systemfrequenz oder die Vorgabe von Terminals und Umsteigehaltestellen sein. Dazu werden die Eingangsdaten des Verkehrswegenetzes - für einen Bus ist das das Straßennetz - so vereinfacht, dass einerseits die Problemgrößen für die Algorithmen reduziert werden und andererseits Ergebnisse erzeugt werden, die planerischen Vorstellungen an die Gestalt der Linien besser entsprechen.
Definire l’identità: un’analisi della relazione spazio-tempo nella scrittura di alcuni autori dei Balcani. Trovare o esprimere la propria identità tra Oriente e Occidente, tra alterità e complementarità
Creators: name: D’Alonzo, Giulia
Publisher: name: ECHO
Year: 2022
Subjects: Identity; Balkan literature; East and West; personal identity; identità; letteratura balcanica; Est e Ovest; identità personale

description: The construction of identity is a process carried out in the Balkan literature. In particular, the set of collective experiences requires a continuous interpretation of our identity. Some authors HAVE investigated the self-identification process through the description of their temporal dimension and socio-cultural setting. The complexity between East and West translates into modern studies in order to explore new spaces and deconstruct personal dimensions. La costruzione dell'identità è un processo delineato nella letteratura balcanica. In particolare, l'insieme delle esperienze collettive richiede una continua interpretazione della nostra identità. Alcuni autori indagano il processo di autoidentificazione attraverso la descrizione della loro dimensione temporale e del contesto socio-culturale. La complessità tra Oriente e Occidente si traduce in studi moderni per esplorare nuovi spazi e decostruire la dimensione personale.
description: ECHO, N. 4 (2022): Metafore del viaggio: testi, identità, generi in movimento
Analytical Fits to the Synchrotron Functions
Creators: name: Fouka, M.
name: Ouichaoui, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Accurate fitting formulae to the synchrotron function, $F(x)$, and its complementary function, $G(x)$, are performed and presented. The corresponding relative errors are less than $0.26\%$ and $0.035\%$ for $F(x) $ and $G(x)$, respectively. To this aim we have, first, fitted the modified Bessel functions, $K_{5/3}(x)$ and $K_{2/3}(x)$. For all the fitted functions, the general fit expression is the same, and is based on the well known asymptotic forms for low and large $x$-values for each function. It consists of multiplying each asymptotic form by a function that tends to unity or zero for low and large $x$-values. Simple formulae are suggested in this paper, depending on adjustable parameters. The latter have been determined by adopting the Levenberg-Marquardt algorithm. The proposed formulae should be of great utility and simplicity for computing spectral powers and the degree of polarization for the synchrotron radiation, both for laboratory and astrophysical applications.
Enabling Cysteine-Free Native Chemical Ligation at Challenging Junctions with a Ligation Auxiliary Capable of Base Catalysis
Creators: name: Fuchs, Olaf
name: Trunschke, Sebastian
name: Hanebrink, Hendrik
name: Reimann, Marc
name: Seitz, Oliver
Publisher: name: Humboldt-Universität zu Berlin
Year: 2021
Subjects: subject: amides
subject: auxiliaries
subject: base catalysis
subject: peptide ligation
subject: protein synthesis
subject: 540 Chemie und zugeordnete Wissenschaften

description: Ligation auxiliaries are used in chemical protein synthesis to extend the scope of native chemical ligation (NCL) beyond cysteine. However, auxiliary-mediated ligations at sterically demanding junctions have been difficult. Often the thioester intermediate formed in the thiol exchange step of NCL accumulates because the subsequent S→N acyl transfer is extremely slow. Here we introduce the 2-mercapto-2-(pyridin-2-yl)ethyl (MPyE) group as the first auxiliary designed to aid the ligation reaction by catalysis. Notably, the MPyE auxiliary provides useful rates even for junctions containing proline or a β-branched amino acid. Quantum chemical calculations suggest that the pyridine nitrogen acts as an intramolecular base in a rate-determining proton transfer step. The auxiliary is prepared in two steps and conveniently introduced by reductive alkylation. Auxiliary cleavage is induced upon treatment with TCEP/morpholine in presence of a MnII complex as radical starter. The synthesis of a de novo designed 99mer peptide and an 80 aa long MUC1 peptide demonstrates the usefulness of the MPyE auxiliary.
Three-hour birthday broadcast
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2020
Subjects: Music

description: Guests: Nicolas Nabokov. Works: Flute Concerto; Sonata No. 4; The Plough That Broke the Plains; Stabat Mater; Piano Etudes Book 2; A Solumn Music; 5 Songs from William Blake; 3 Pictures for Orchestra.
In viaggio tra letteratura, cinema e new media: alla scoperta del Québec
Creators: name: Palumbo, Maria
Publisher: name: ECHO
Year: 2022
Subjects: Travel; Québec; Literature; Cinema; New Media; Viaggio; Québec; Letteratura; Cinema; Nuovi Media

description: Québec has always experienced a ‘mediation’ between two cultures: French and American. To solve this identity crisis, the role played by the road, understood as therapy and care, is crucial. Travel, over time, has been influenced by social changes. The new way of traveling follows the dynamics of mass consumption and we are witnessing the loss of the original meaning of ‘travel’. This paper focuses on the evolution of the travel narrative and the traveler through the analysis of literature, cinematography and new media communication in the context of Québec. Il Québec ha sempre vissuto una mediazione tra due culture: quella francese e quella americana. Per risolvere questa crisi di identità è fondamentale il ruolo svolto dalla strada, intesa come terapia e cura. Il viaggio, nel tempo, è stato influenzato dai cambiamenti sociali, il nuovo modo di viaggiare segue le dinamiche del consumo di massa e assistiamo alla perdita del significato originario di viaggio. Il presente lavoro si concentra sull'evoluzione del racconto di viaggio e del viaggiatore attraverso l'analisi della letteratura, della cinematografia e della comunicazione dei nuovi media nel contesto del Québec.
description: ECHO, N. 4 (2022): Metafore del viaggio: testi, identità, generi in movimento
Investigation of the semileptonic transition of the $B$ into the orbitally excited charmed tensor meson
Creators: name: Azizi, K.
name: Sundu, H.
name: Sahin, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The transition form factors of the semileptonic $B \rightarrow D_2^*(2460)\ell\barν\,\,\,\,(\ell=τ,μ,e)$ decay channel are calculated within the framework of the three-point QCD sum rules. The fit functions of the form factors are then used to estimate the total decay width and branching ratio of this transition. The order of branching ratio shows that this channel can be detected at LHCb.
description: 15 Pages, 4 Figures and 5 Tables
title: Advancing XRCT techniques : from enhanced segmentation to improved temporal resolution and advanced micromodel fabrication for pore-scale studies
Creators: name: Lee, Dongwon
Publisher: name: Stuttgart : Institute of Applied Mechanics
Year: 2024
Subjects: subject: 620

description: This study explores innovative strategies to overcome spatial and temporal constraints inherent in lab-based X-ray computed tomography (XRCT) for pore-scale studies of porous media. The research focuses on three main aspects: enhancement of segmentation techniques, improvement of temporal resolution, and integration of advanced micromodel fabrication with XRCT imaging. Firstly, an exploration is conducted into the refinement of segmentation workflows tailored for micro-fracture networks within Carrara marble XRCT datasets, which are often characterized by low-contrast imaging and ambiguous boundaries due to apertures below the spatial resolution limit. Through a meticulous examination of various methodologies, including machine learning-based algorithms, significant advancements in computation time and accuracy are demonstrated compared to conventional segmentation workflows. Notably, machine learning methods exhibit superior performance, even in scenarios where images are contaminated with noise, showcasing their potential for enhancing segmentation outcomes. Secondly, the challenge of temporal limitations in XRCT imaging, especially during the study of dynamic processes within porous media, is addressed. Conventional XRCT technologies often encounter a trade-off between image quality, including spatial resolution, and scanning time. To mitigate this constraint, innovative workflows leveraging machine learning algorithms are proposed to augment temporal resolution. By capturing pore space alterations during phenomena such as Enzyme Induced Calcite Precipitation (EICP) with heightened fidelity, these approaches offer invaluable insights into the dynamic fluid flow dynamics that govern porous media behavior. Thirdly, an integrated methodology that combines 3D micromodel fabrication with XRCT imaging techniques is introduced. This comprehensive approach enables the design, fabrication, and validation of 3D micromodels that faithfully replicate the pore-scale characteristics of natural porous media. Leveraging stochastic reconstruction algorithms and advanced 3D printing technologies, highly detailed micromodels with unprecedented spatial resolutions are created. These micromodels serve as invaluable tools for validating numerical simulations, elucidating pore-scale phenomena, and advancing the understanding of fluid dynamics in complex yet well-controlled porous media systems. The outlook suggests further advancements through the integration of multi-modal techniques, machine learning, and expansion of training datasets to overcome current limitations, offering unprecedented insights into complex fluid flow phenomena within porous media.