cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Il gioco computerizzato per il potenziamento cognitivo e la promozione del successo scolastico. Un approccio evidence based
Creators: name: Trinchero, Roberto
Publisher: name: Form@re - Open Journal per la formazione in rete
Year: 2014
Subjects: potenziamento cognitivo; gioco computerizzato; videogioco; successo scolastico; approccio basato sull’evidenza

description: Che cos’è il potenziamento cognitivo? Quali sono le condizioni che lo rendono realmente efficace nel promuovere il successo scolastico di bambini e ragazzi? Il gioco computerizzato può offrire opportunità in tal senso? Il saggio intende definire alcuni criteri da tenere presente nel progettare attività supportate da giochi computerizzati volte ad incrementare le capacità cognitive di bambini e ragazzi, al fine di migliorare gli apprendimenti e promuovere il successo scolastico. Tali criteri sono applicabili tanto alla progettazione di attività da svolgere a scuola e in percorsi extrascolastici di potenziamento e recupero, quanto alla progettazione di giochi e software specifici. Un’adeguata progettazione è importante perché l’uso delle tecnologie ludiche ha dimostrato di avere in sé grandi potenzialità nel migliorare le capacità attentive e di memoria e le funzioni esecutive, ma non porta automaticamente benefici sugli apprendimenti scolastici e maggiori opportunità di successo formativo.
description: Form@re - Open Journal per la formazione in rete, Vol 14, N° 3: Instructional design e game-based learning
Four-dimensional lattice chiral gauge theories with anomalous fermion content
Creators: name: Kikukawa, Yoshio
name: Suzuki, Hiroshi
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In continuum field theory, it has been discussed that chiral gauge theories with Weyl fermions in anomalous gauge representations (anomalous gauge theories) can consistently be quantized, provided that some of gauge bosons are permitted to acquire mass. Such theories in four dimensions are inevitablly non-renormalizable and must be regarded as a low-energy effective theory with a finite ultraviolet (UV) cutoff. In this paper, we present a lattice framework which enables one to study such theories in a non-perturbative level. By introducing bare mass terms of gauge bosons that impose ``smoothness'' on the link field, we explicitly construct a consistent fermion integration measure in a lattice formulation based on the Ginsparg-Wilson (GW) relation. This framework may be used to determine in a non-perturbative level an upper bound on the UV cutoff in low-energy effective theories with anomalous fermion content. By further introducing the Stückelberg or Wess-Zumino (WZ) scalar field, this framework provides also a lattice definition of a non-linear sigma model with the Wess-Zumino-Witten (WZW) term.
description: 18 pages, the final version to appear in JHEP
Memoria personal e Historia nacional: conversando con Suso de Toro - Memoria personale e Storia nazionale: conversazione con Suso de Toro
Creators: name: Polverini, Sara
Publisher: name: Firenze University Press
Year: 2014
Subjects: Anti-Francoism; Engaged literature; Francoism; Historical memory; Suso de Toro

description: In the following interview, Suso de Toro recalls his career as a novelist from the beginnings to the present day. He focuses on the evolution of his narrative style against the backdrop of the recent Spanish historical context. The author concentrates on those works that characterize him as an engaged writer: Non volvas (2000), Home sen nome (2006), Sete palabras (2010) e Somnámbulos (2014).
description: LEA - Lingue e Letterature d'Oriente e d'Occidente, Vol 3 (2014)
Is Faith The Enemy Of Science?
Creators: name: MacKenzie, Richard
Publisher: name: arXiv
Year: 2008
Subjects: subject: Popular Physics (physics.pop-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this article, inspired by Lawrence Krauss' plenary talk at the 2007 CAP congress, the relation between faith and science is examined.
description: 9 pages. To be published in Physics In Canada
An Ostrowski-Gruss type inequality on time scales
Creators: name: Liu, Wenjun
name: Ngo, Quoc Anh
Publisher: name: arXiv
Year: 2008
Subjects: subject: Functional Analysis (math.FA)
subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 26D15, 39A10, 39A12, 39A13

description: In this paper we derive a new inequality of Ostrowski-Gruss type on time scales and thus unify corresponding continuous and discrete versions. We also apply our result to the quantum calculus case.
description: 7 pages
Quantum cohomology of [C^N/μ_r]
Creators: name: Bayer, Arend
name: Cadman, Charles
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14N35, 14A20

description: We give a construction of the moduli space of stable maps to the classifying stack Bμ_r of a cyclic group by a sequence of r-th root constructions on M_{0, n}. We prove a closed formula for the total Chern class of μ_r-eigenspaces of the Hodge bundle, and thus of the obstruction bundle of the genus zero Gromov-Witten theory of stacks of the form [C^N/μ_r]. We deduce linear recursions for all genus-zero Gromov-Witten invariants.
description: 33 pages, 1 figure; v2: expository changes, references updated
Fluctuations in heat engines
Creators: name: Holubec, Viktor
name: Ryabov, Artem
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: At the dawn of thermodynamics, Carnot's constraint on efficiency of heat engines stimulated the formulation of one of the most universal physical principles, the second law of thermodynamics. In recent years, the field of heat engines acquired a new twist due to enormous efforts to develop and describe microscopic machines based on systems as small as single atoms. At microscales, fluctuations are an inherent part of dynamics and thermodynamic variables such as work and heat fluctuate. Novel probabilistic formulations of the second law imply general symmetries and limitations for the fluctuating output power and efficiency of the small heat engines. Will their complete understanding ignite a similar revolution as the discovery of the second law? Here, we review the known general results concerning fluctuations in the performance of small heat engines. To make the discussion more transparent, we illustrate the main abstract findings on exactly solvable models and provide a thorough theoretical introduction for newcomers to the field.
description: review article on fluctuations in heat engines, 49 pages, 8 figures, 3nd version
Electromagnetic Induced Gravitational Perturbations
Creators: name: Adamo, T. M.
name: Newman, E. T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the physical consequences of two diffferent but closely related perturbation schemes applied to the Einstein-Maxwell equations. In one case the starting space-time is flat while in the other case it is Schwarzschild. In both cases the perturbation is due to a combined electric and magnetic dipole field. We can see, within the Einstein-Maxwell equations a variety of physical consequences. They range from induced gravitational energy-momentum loss, to a well defined spin angular momentum with its loss and a center-of-mass with its equations of motion.
description: 17
NISQA: A Deep CNN-Self-Attention Model for Multidimensional Speech Quality Prediction with Crowdsourced Datasets
Creators: name: Mittag, Gabriel
name: Naderi, Babak
name: Chehadi, Assmaa
name: Möller, Sebastian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper, we present an update to the NISQA speech quality prediction model that is focused on distortions that occur in communication networks. In contrast to the previous version, the model is trained end-to-end and the time-dependency modelling and time-pooling is achieved through a Self-Attention mechanism. Besides overall speech quality, the model also predicts the four speech quality dimensions Noisiness, Coloration, Discontinuity, and Loudness, and in this way gives more insight into the cause of a quality degradation. Furthermore, new datasets with over 13,000 speech files were created for training and validation of the model. The model was finally tested on a new, live-talking test dataset that contains recordings of real telephone calls. Overall, NISQA was trained and evaluated on 81 datasets from different sources and showed to provide reliable predictions also for unknown speech samples. The code, model weights, and datasets are open-sourced.
description: Submitted to Interspeech 2021
Primary, Bilateral Breast Abscesses Secondary to Actinomyces Neuii Infection in an Immunocompetent Man
Creators: name: Zeenat Qureshi Stroke Institutes
Publisher: name: Zenodo
Year: 2023

description: Background— Actinomyces neuii rarely causes infection in humans. We report potentially the first case of primary actinomycosis of both breasts with Actinomyces neuii in an immunocompetent man with no reported history of trauma/surgery.Case description— A 40-year-old man reported chronic green bilateral nipple discharge. Patient underwent incision and drainage of left breast abscess in the outpatient setting and a course of clindamycin, sulfamethoxazole-trimethoprim, and penicillin. Patient continued to have drainage while on penicillin orally. A repeat culture of exudate in blood agar media identified Actinomyces neuii growth. Patient reported that nipples were pierced years earlier. Breast ultrasound confirmed abscess. After the extended course of penicillin, the patient was started on oral linezolid and the bilateral breast drainage resolved after 2 weeks.Conclusion— Actinomyces neuii infections can occur in rare scenarios and require considerably longer antibiotic courses than common skin and subcutaneous infections, hence early diagnosis is necessary by obtaining cultures from breast abscess.
The role of anti-phospholipase A2 receptor antibodies in membranous nephropathy
Creators: name: Nikolopoulou, Aikaterini Lina
Publisher: name: Imperial College London
Year: 2021

description: Membranous nephropathy (MN) is a common cause of nephrotic syndrome in adults and can lead to end stage kidney disease. This thesis reports on a number of investigative approaches to better understand the pathogenesis, heterogeneity, and responses to therapy in MN. A database of all patients with MN diagnosed at Imperial College Healthcare NHS Trust from 2000 to 2020 was created and following the development of a staining protocol, all available renal biopsies were stained for PLA2R. The results demonstrated that PLA2R positive MN was common and confirmed by biopsy staining in 69% of cases. MN can be effectively treated with tacrolimus immunosuppression with good long term remission rates, but relapses occur after treatment cessation and are usually associated with PLA2R positivity on biopsy and return of circulating anti-PLA2R antibodies. A randomised controlled trial examining whether the addition of MMF to tacrolimus would reduce relapse rates after treatment cessation showed that the addition of MMF was not beneficial. It has been suggested that the differentiation between primary and secondary MN should be based on the presence or absence of PLA2R in the glomerular immune deposits; however, anti-PLA2R antibodies can be found in cases of “secondary” MN associated with viral infection. PLA2R positive MN was found in 52% of cases of MN associated with viral infection. Although spontaneous remission was common, 80% of PLA2R positive MN cases associated with viral infection required immunosuppressive treatment to achieve remission. Crescentic MN can be associated with ANCA or anti-GBM antibodies, or less often with anti-PLA2R antibodies alone, and can be successfully treated as a necrotising and crescentic glomerulonephritis. Complement has an important role in MN and in PLA2R positive cases glomerular deposition of complement components was significantly increased compared to PLA2R negative cases. Glomerular intensity for FHR5 was significantly increased in the PLA2R positive cases and correlated with intensity of glomerular C3c, C3d, C4d and C5b9 indicating a role for the alternative pathway in MN. Anti-PLA2R antibodies can affect podocytes in the presence of complement leading to mild changes in the actin cytoskeleton that could be associated with progressive loss of podocyte architecture and function leading to effacement of the foot processes. These data provide important information on the role of anti-PLA2R antibodies in MN, as well as clinical data supporting the use of tacrolimus for the treatment of MN, and experimental evidence indicating a role for complement in MN.
Rational singularities associated to pairs
Creators: name: Schwede, Karl
name: Takagi, Shunsuke
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 14B05; 13A35

description: In this paper we introduce a notion of rational singularities associated to pairs $(X, \ba^t)$ where $X$ is a variety, $\ba$ is an ideal sheaf and $t$ is a nonnegative real number. We prove that most standard results about rational singularities extend to this context. We also show that some results commonly associated with log terminal pairs have analogs in this context, including results related to inversion of adjunction. A positive characteristic analogue of rational singularities of pairs is also defined and explored.
description: 31 pages; v.4: a minor mistake in the characteristic p theory is corrected, see Remark 1.1 for details
A globalized inexact semismooth Newton method for nonsmooth fixed--point equations involving variational inequalities
Creators: name: Alphonse, Amal
name: Christof, Constantin
name: Hintermüller, Michael
name: Papadopoulos, Ioannis
Publisher: name: Weierstrass Institute
Year: 2024
Subjects: subject: Semismooth Newton method
subject: quasi-variational inequality
subject: thermoforming
subject: nonsmooth analysis
subject: obstacle problem
subject: Newton differentiability
subject: semismoothness
subject: superlinear convergence
subject: 35J86
subject: 47J20
subject: 49J40
subject: 49J52
subject: 49M15

description: We develop a semismooth Newton framework for the numerical solution of fixed-point equations that are posed in Banach spaces. The framework is motivated by applications in the field of obstacle-type quasi-variational inequalities and implicit obstacle problems. It is discussed in a general functional analytic setting and allows for inexact function evaluations and Newton steps. Moreover, if a certain contraction assumption holds, we show that it is possible to globalize the algorithm by means of the Banach fixed-point theorem and to ensure q-superlinear convergence to the problem solution for arbitrary starting values. By means of a localization technique, our Newton method can also be used to determine solutions of fixed-point equations that are only locally contractive and not uniquely solvable. We apply our algorithm to a quasi-variational inequality which arises in thermoforming and which not only involves the obstacle problem as a source of nonsmoothness but also a semilinear PDE containing a nondifferentiable Nemytskii operator. Our analysis is accompanied by numerical experiments that illustrate the mesh-independence and q -superlinear convergence of the developed solution algorithm.
The geometry of determinant line bundles in noncommutative geometry
Creators: name: Chakraborty, Partha Sarathi
name: Mathai, Varghese
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: This paper is concerned with the study of the geometry of determinant line bundles associated to families of spectral triples parametrized by the moduli space of gauge equivalent classes of Hermitian connections on a Hermitian finite projective module. We illustrate our results with some examples that arise in noncommutative geometry.
description: Latex2e, 17 pages, final version, to appear in J. Noncommutative Geometry
Self-consistency over the charge-density in dynamical mean-field theory: a linear muffin-tin implementation and some physical implications
Creators: name: Pourovskii, L. V.
name: Amadon, B.
name: Biermann, S.
name: Georges, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a simple implementation of the dynamical mean-field theory approach to the electronic structure of strongly correlated materials. This implementation achieves full self-consistency over the charge density, taking into account correlation-induced changes to the total charge density and effective Kohn-Sham Hamiltonian. A linear muffin-tin orbital basis-set is used, and the charge density is computed from moments of the many body momentum-distribution matrix. The calculation of the total energy is also considered, with a proper treatment of high-frequency tails of the Green's function and self-energy. The method is illustrated on two materials with well-localized 4f electrons, insulating cerium sesquioxide Ce2O3 and the gamma-phase of metallic cerium, using the Hubbard-I approximation to the dynamical mean-field self-energy. The momentum-integrated spectral function and momentum-resolved dispersion of the Hubbard bands are calculated, as well as the volume-dependence of the total energy. We show that full self-consistency over the charge density, taking into account its modification by strong correlations, can be important for the computation of both thermodynamical and spectral properties, particularly in the case of the oxide material.
description: 20 pages, 6 figures (submitted in The Physical Review B)
Light-shift tomography in an optical-dipole trap for neutral atoms
Creators: name: Brantut, Jean-Philippe
name: Clément, Jean-François
name: Vincent, Martin Robert De Saint
name: Varoquaux, Gael
name: Nyman, Robert A.
name: Aspect, Alain
name: Bourdel, Thomas
name: Bouyer, Philippe
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report on light-shift tomography of a cloud of 87 Rb atoms in a far-detuned optical-dipole trap at 1565 nm. Our method is based on standard absorption imaging, but takes advantage of the strong light-shift of the excited state of the imaging transition, which is due to a quasi-resonance of the trapping laser with a higher excited level. We use this method to (i) map the equipotentials of a crossed optical-dipole trap, and (ii) study the thermalisation of an atomic cloud by following the evolution of the potential-energy of atoms during the free-evaporation process.
Conditions for the Trivers-Willard hypothesis to be valid: A minimal population-genetic model
Creators: name: Joshi, N. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: The very insightful Trivers-Willard hypothesis, proposed in the early 1970s, states that females in good physiological conditions are more likely to produce male offspring, when the variance of reproductive success amongst males is high. A number of studies, aimed at its experimental verification, have found adequate supportive evidence in its favour. Theoretical investigations, however, have been few, perhaps because formulating a population-genetic model for describing the Trivers-Willard hypothesis turns out to be surprisingly complex. The present study describes a minimal population genetic model to explore one specific scenario, viz. how is the preference for a male offspring by females in good condition altered when 'g', the proportion of such females in the population changes from a low to a high value. As expected, when the proportion of such females is low, i.e., for low values of 'g', the Trivers-Willard (TW) strategy goes to fixation against the equal investment strategy. This holds true up to gmax, a critical value of 'g', above which the two strategies coexist, but the proportion of the TW strategy steadily decreases as 'g' increases to unity. Similarly, when the effect of well-endowed males attaining disproportionately high number of matings is more pronounced, the TW strategy is more likely to go to fixation. Interestingly, the success of the TW strategy has a complex dependence on the variance in the physiological condition of females. If the difference in the two types of conditions is not large, TW strategy is favoured, and its success is more likely as the difference increases. However, beyond a critical value of the difference, the TW strategy is found to be less and less likely to succeed as the difference becomes larger. Possible reasons for these effects are discussed.
description: 14 pages including 4 figures
A Note on Self-gravitating Radiation in AdS Spacetime
Creators: name: Li, Zhong-Hua
name: Hu, Bin
name: Cai, Rong-Gen
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we investigate the equilibrium self-gravitating radiation in higher dimensional, plane symmetric anti-de Sitter space. We find that there exist essential differences from the spherically symmetric case: In each dimension ($d\geq 4$), there are maximal mass (density), maximal entropy (density) and maximal temperature configurations, they do not appear at the same central energy density; the oscillation behavior appearing in the spherically symmetric case, does not happen in this case; and the mass (density), as a function of the central energy density, increases first and reaches its maximum at a certain central energy density and then decreases monotonically in $ 4\le d \le 7$, while in $d \geq 8$, besides the maximum, the mass (density) of the equilibrium configuration has a minimum: the mass (density) first increases and reaches its maximum, then decreases to its minimum and then increases to its asymptotic value monotonically. The reason causing the difference is discussed.
description: Revtex, 13 pages with 8 eps figures, to appear in PRD; v2: typos corrected and the version in PRD
Network visualisation of genomic transposable element content for comparative analysis
Creators: name: Schneider, Lisa Maria
Publisher: name: Imperial College London
Year: 2021

description: Transposable elements (TEs) are discrete DNA sequences that multiply and move within their host genomes. These elements are widespread across eukaryotic species and occupy over 50% of the human genome, however their abundance and diversity vary widely between species. The factors shaping the differences in TE content are poorly understood. Investigating the evolution of TEs has its difficulties, because their sequences diversify rapidly and TEs are often transferred through non-conventional means such as horizontal gene transfer. I developed methods for the visualisation and analysis of TE content across a multitude of genomes. Furthermore, I used these techniques to investigate epigenetic mechanisms and their potential role in the evolution of TE abundance and diversity amongst species. First, I constructed a sequence similarity network (SSN) to study the sequence evolution of Tc1/mariner elements across focal nematode species. With this method I was able to identify an unknown connection between two TE families and an associated convergent acquisition of a domain from a protein-coding gene. Second, I developed a weighted bipartite network to investigate how TE content across species is shaped by epigenetic silencing mechanisms. I show that the presence of PIWI-interacting RNAs (piRNAs) is associated with differences in network topology after controlling for phylogenetic effects, indicating higher tolerance of TEs in species with piRNAs. Additionally my analysis of single cell RNA sequencing data from Caenorhabditis elegans embryogenesis gives evidence that some TE families are differentially expressed during C. elegans embryonic development and show cell type specific expression patterns. Together this thesis demonstrates how network-based approaches can be used to identify hitherto unknown properties of TE evolution across species. It gives an insight into the factors responsible for TE diversity, including epigenetic mechanisms and the beneficial effects of TEs for their host genomes.
On the Energy Scaling Behaviour of a Singularly Perturbed Tartar Square
Creators: name: Rüland, Angkana
name: Tribuzio, Antonio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this article we derive an (almost) optimal scaling law for a singular perturbation problem associated with the Tartar square. As in \cite{W97, C99}, our upper bound quantifies the well-known construction which is used in the literature to prove flexibility of the Tartar square in the sense of flexibility of approximate solutions to the differential inclusion. The main novelty of our article is the derivation of an (up to logarithmic powers matching) ansatz free lower bound which relies on a bootstrap argument in Fourier space and is related to a quantification of the interaction of a nonlinearity and a negative Sobolev space in the form of "a chain rule in a negative Sobolev space". Both the lower and the upper bound arguments give evidence of the involved "infinite order of lamination".
description: 23 pages, 5 figures, comments welcome
Separability of entangled qutrits in noisy channels
Creators: name: Chȩcińska, Agata
name: Wódkiewicz, Krzysztof
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present an analysis of noisy atomic channels involving qutrits. We choose a three-level atom with V-configuration to be the qutrit state. Gell-Mann matrices and a generalized Bloch vector (8-dimensional) are used to describe the qutrit density operator. We introduce quantum quasi-distributions for qutrits that provide a simple description of entanglement. Studying the time-evolution for the atomic variables we find the Kraus representation of spontaneous emission quantum channel (SE channel). Furthermore, we consider a generalized Werner state of two qutrits and investigate the separability condition in the presence of spontaneous emission noise. The influence of spontaneous emission on the separability of Werner states for qutrit and qubit states is compared.
description: 19 pages, 5 figures
Sub-milliarcsecond precision spectro-astrometry of Be stars
Creators: name: Oudmaijer, Rene
name: Parr, Andrew
name: Baines, Deborah
name: Porter, John
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The origin of the disks around Be stars is still not known. Further progress requires a proper parametrization of their structure, both spatially and kinematically. This is challenging as the disks are very small. Here we assess whether a novel method is capable of providing these data. We obtained spectro astrometry around the Pa beta line of two bright Be stars, alpha Col and zeta Tau, to search for disk signatures. The data, with a pixel to pixel precision of the centroid position of 0.3..0.4 milliarcsecond is the most accurate such data to date. Artefacts at the 0.85 mas level are present in the data, but these are readily identified as they were non-repeatable in our redundant datasets. This does illustrate the need of taking multiple data to avoid spurious detections. The data are compared with simple model simulations of the spectro astrometric signatures due to rotating disks around Be stars. The upper limits we find for the disk radii correspond to disk sizes of a few dozen stellar radii if they rotate Keplerian. This is very close to observationally measured and theoretically expected disk sizes, and this paper therefore demonstrates that spectro-astrometry, of which we present the first such attempt, has the potential to resolve the disks around Be stars.
description: 6 pages, A&A accepted
title: Revogar “o dia triunfal”
Creators: name: Ferreira, Pedro Tiago
Publisher: name: IELT – Instituto de Estudos de Literatura e Tradição, Faculdade de Ciências Sociais e Humanas, Universidade NOVA de Lisboa
Year: 2014

description: O objectivo deste ensaio é o de chamar a atenção para o facto de que certas práticas efectuadas nos Estudos Literários são ilegais. Os exemplos apontados neste trabalho consistem na possibilidade de ocorrência de duas situações que tornariam a feitura de crítica literária baseada na denominada “carta sobre a génese dos heterónimos”, de Fernando Pessoa, ilegal. A primeira dessas situações prende-se com a possibilidade de a autorização de publicação da referida carta ser revogável a todo o tempo, por parte dos herdeiros. A segunda decorre da constatação de que o parágrafo sobre o ocultismo é confidencial, classificação que decorre, por um lado, do facto de Pessoa ter pedido, expressamente, que o mesmo não fosse publicado, e, por outro lado, de incidir sobre um aspecto da vida privada de Pessoa, i.e. uma crença da ordem do sobrenatural. Por estas razões, publicar este mesmo parágrafo é ilegal, com ou sem autorização dos herdeiros, e, consequentemente, toda a crítica que sobre ele verse é, igualmente, ilegal, na medida em que, pelo menos indirectamente, contribui para a divulgação do seu conteúdo. Assim, mediante decisão judicial que declarasse esta mesma ilegalidade, tanto o parágrafo sobre o ocultismo como toda a crítica que sobre ele verse poderiam ser retirados de circulação.
description: FERREIRA, Pedro Tiago (2014) “Revogar «o dia triunfal»”, Revista Estranhar Pessoa, 1: 83–99. ISSN 2183-4075.
Tight binding formulation of the dielectric response in semiconductor nanocrystals
Creators: name: Trani, F.
name: Ninno, D.
name: Iadonisi, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on a theoretical derivation of the electronic dielectric response of semiconductor nanocrystals using a tight-binding framework. Extending to the nanoscale the Hanke and Sham approach [Phys. Rev. B 12, 4501 (1975)] developed for bulk semiconductors, we show how local field effects can be included in the study of confined systems. A great advantage of this scheme is that of being formulated in terms of localized orbitals and thus it requires very few computational resources and times. Applications to the optical and screening properties of semiconductor nanocrystals are presented here and discussed. Results concerning the absorption cross section, the static polarizability and the screening function of InAs (direct gap) and Si (indirect gap) nanocrystals compare well to both first principles results and experimental data. We also show that the present scheme allows us to easily go beyond the continuum dielectric model, based on the Clausius-Mossotti equation, which is frequently used to include the nanocrystal surface polarization. Our calculations indicate that the continuum dielectric model, used in conjunction with a size dependent dielectric constant, underestimates the nanocrystal polarizability, leading to exceedingly strong surface polarization fields.
description: 9 pages, 5 figures; corrected typos, added references
Hall Conductivity of Flavor Fields from AdS/CFT
Creators: name: O'Bannon, Andy
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We use the AdS/CFT correspondence to compute a conductivity associated with massive N=2 supersymmetric hypermultiplet fields at finite baryon density, propagating through an N=4 supersymmetric SU(Nc) Yang-Mills plasma in the large Nc, large 't Hooft coupling limit. We do so by introducing external electric and magnetic fields coupled to baryon number and computing the resulting induced current, from which we extract the conductivity tensor. At large hypermultiplet mass we compute the drag force on the charge carriers. We also compute the product of the drag coefficient with the kinetic mass, and find that the answer is unchanged from the zero density case. The gravitational dual is a probe D7-brane, with a nontrivial worldvolume gauge field configuration, in an AdS-Schwarzschild background. We identify an effective horizon on the D7-brane worldvolume analogous to the worldsheet horizon observed for strings moving in the same background. We generalize our results to a class of theories described by probe D-branes in various backgrounds.
description: 22 pages, 4 figures
Quantum single-photon control, storage, and entanglement generation with planar atomic arrays
Creators: name: Ballantine, K. E.
name: Ruostekoski, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: While artificially fabricated patterned metasurfaces are providing paradigm-shifting optical components for classical light manipulation, strongly interacting, controllable, and deterministic quantum interfaces between light and matter in free space remain an outstanding challenge. Here we theoretically demonstrate how to achieve quantum control of both the electric and magnetic components of an incident single-photon pulse by engineering the collective response of a two-dimensional atomic array. High-fidelity absorption and storage in a long-lived subradiant state, and its subsequent retrieval, are achieved by controlling classically or quantum mechanically the ac Stark shifts of the atomic levels and suppressing the scattering during the absorption. Quantum wavefront control of the transmitted photon with nearly zero reflection is prepared by coupling the collective state of the array to another photon in a cavity and by engineering a Huygens' surface of atoms using only a single coherent standing wave. The proposed schemes allow for the generation of entanglement between the cavity, the lattice, and hence the state of the stored, reflected or transmitted light, and for quantum-state transfer between the cavity and propagating photons. Bipartite entanglement generation is explicitly calculated between a stored single-photon excitation of the array and the cavity photon. We illustrate the control by manipulating the phase, phase superposition, polarization, and direction of a transmitted or reflected photon, providing quantum-optical switches and functional quantum interfaces between light and atoms that could form links in a larger quantum information platform.
Non-cumulative measures of researcher citation impact
Creators: name: Wilson, Mark C.
name: Tang, Zhou
Publisher: name: arXiv
Year: 2021
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: The most commonly used publication metrics for individual researchers are the the total number of publications, the total number of citations, and Hirsch's $h$-index. Each of these is cumulative, and hence increases throughout a researcher's career, making it less suitable for evaluation of junior researchers or assessing recent impact. Most other author-level measures in the literature share this cumulative property. By contrast, we aim to study non-cumulative measures that answer the question "in terms of citation impact, what have you done lately?" We single out six measures from the rather sparse literature, including Hirsch's $m$-index, a time-scaled version of the $h$-index. We introduce new measures based on the idea of "citation acceleration". After presenting several axioms for non-cumulative measures, we conclude that one of our new measures has much better theoretical justification. We present a small-scale study of its performance on real data and conclude that it shows substantial promise for future use.
description: 11 pages; journal version is open access and has link to data
Interferometric CO Observations of submillimeter-faint, radio-selected starburst galaxies at z~2
Creators: name: Chapman, S. C.
name: Neri, R.
name: Bertoldi, F.
name: Smail, Ian
name: Greve, T. R.
name: Trethewey, D.
name: Blain, A. W.
name: Cox, P.
name: Genzel, R.
name: Ivison, R. J.
name: Kovacs, A.
name: Swinbank, A. Omont A. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: High-redshift, dust-obscured galaxies -- selected to be luminous in the radio but relatively faint at 850um -- appear to represent a different population from the ultra-luminous submillimeter- (submm-) bright population. They may be star-forming galaxies with hotter dust temperatures or they may have lower far-infrared luminosities and larger contributions from obscured active galactic nuclei (AGN). Here we present observations of three z~2 examples of this population, which we term submm-faint radio galaxies (SFRGs) in CO(3-2) using the IRAM Plateau de Bure Interferometer to study their gas and dynamical properties. We estimate the molecular gas mass in each of the three SFRGs (8.3x10^{9} M_odot, <5.6x10^{9} M_odot and 15.4x10^{9} M_odot, respectively) and, in the case of RG163655, a dynamical mass by measurement of the width of the CO(3-2) line (8x10^{10} csc^2i M_odot). While these gas masses are substantial, on average they are 4x lower than submm-selected galaxies (SMGs). Radio-inferred star formation rates (=970 M_odot\yr) suggest much higher star-formation efficiencies than are found for SMGs, and shorter gas depletion time scales (~11 Myr), much shorter than the time required to form their current stellar masses (~160 Myr; ~10^{11} M_odot). By contrast, SFRs may be overestimated by factors of a few, bringing the efficiencies in line with those typically measured for other ultraluminous star-forming galaxies and suggesting SFRGs are more like ultraviolet- (UV-)selected star-forming galaxies with enhanced radio emission. A tentative detection of \rga at 350um suggests hotter dust temperatures -- and thus similar gas-to-dust mass fractions -- as the SMGs. We conclude that SFRGs' radio luminosities are larger than would naturally scale from local ULIRGs given their gas masses or gas fractions.
description: 8 pages, 3 figures, accepted in ApJ
จริยธรรมของนักการเมือง
Creators: name: อุไรวรรณ ธนสถิตย์
Publisher: name: ศูนย์คุณธรรม (องค์การมหาชน)
Year: 2013
Subjects: จริยธรรมของนักการเมือง

description: 1, 2, วารสารวิชาการคุณธรรมความดี
Structural and Morphological Effect of Ti underlayer on Pt/Co/Pt Magnetic Ultra-Thin Film
Creators: name: Öcal, Melek Türksoy
name: Sakar, Baha
name: Öztoprak, İlker
name: Balogh-Michels, Zoltan
name: Neels, Antonia
name: Öztürk, Osman
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Pt(xÅ)/Co(5Å)/Pt(10Å) trilayer films were deposited on naturally oxidized Si(111) substrate to investigate Ti underlayer effect on PMA. A small amount of Ti underlayer promoted the magnetic anisotropy to a perpendicular direction for x=8Å and 10Å. Both GI XRD and STM results showed that the Ti underlayer manipulated the growth of trilayer film. The Pt particles preferably grow the neighborhood of the Ti cluster, giving rise to a relatively smooth layer with a fiber texture fcc (111) structure. By contrast, the absence of Ti underlayer leads to clustered, relatively rough, and randomly oriented nano-crystalline growth. Differences in the growth mode, especially roughness, also appeared as intensity loss in XPS spectra due to shadowing effects. Our results indicate that a traceable amount of underlayer can change the magnetic anisotropy of the film by manipulating film growth.
The role of DNA damage repair in Salmonella persister survival and relapse during infection
Creators: name: Moldoveanu, Ana Laura
Publisher: name: Imperial College London
Year: 2021

description: The rise of antibiotic treatment failure represents a serious global health problem. Along with antibiotic resistance, antibiotic tolerance and persistence make up the three phenomena underlying the ability of bacteria to survive treatment with bactericidal antibiotics. Primarily distinguished by their penetrance within a bacterial population, antibiotic tolerance and persistence are superficially similar phenomena, with both relying on low antibiotic uptake or target activity due to slow or arrested bacterial growth. As such, it is widely assumed that similar mechanisms underpin the ability of persistent and tolerant bacteria to survive antibiotic exposure. However, to date, little evidence directly supports mechanistic equivalence between these two forms of antibiotic recalcitrance. In this thesis, I compare the molecular mechanisms enabling the survival of antibiotic tolerant and persistent Salmonella Typhimurium during macrophage infection. First, I identify purA as a multidrug antibiotic tolerant Salmonella mutant. Using this mutant, I then directly compare the physiological states adopted by antibiotic tolerant Salmonella and wild type persisters during macrophage infection. Specifically, I show that tolerant Salmonella adopt a near-dormant state, undergoing minimal DNA damage during macrophage infection. In contrast, persisters retain an active but vulnerable physiological state that is prone to the accumulation of double-stranded DNA (dsDNA) breaks during macrophage infection. In view of these initial observations, I next explore the dependence of Salmonella persisters on various DNA repair pathways for survival during macrophage infection, uncovering that these bacteria rely extensively on RecA-mediated DNA repair to overcome their inherent vulnerability to the intramacrophage environment. Finally, I compare the relative ability of tolerant and persistent bacteria to initiate infection relapse after cessation of antibiotic treatment. This revealed that, despite their vulnerability, persisters retain the ability to initiate infection relapse as long as they are protected by RecA-mediated DNA repair. Overall, this work highlights the importance of RecA-mediated DNA repair for wild type Salmonella persisters to survive within the host during antibiotic treatment and to initiate infection relapse following drug withdrawal.
Constraining the mSUGRA parameter space using the entropy of dark matter halos
Creators: name: Nunez, Dario
name: Zavala, Jesus
name: Nellen, Lukas
name: Sussman, Roberto A.
name: Cabral-Rosetti, Luis G.
name: Mondragon, Myriam
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We derive an expression for the entropy of a dark matter halo described by a Navarro-Frenk-White model with a core. The comparison of this entropy with the one of dark matter at the freeze-out era allows us to constraint the parameter space in mSUGRA models. Moreover, joining these constraints with the ones obtained from the usual abundance criteria and demanding both criteria to be consistent with the 2$σ$ bounds for the abundance of dark matter: $0.112\leqΩ_{DM}h^2\leq0.122$, we are able to clearly discriminate validity regions among the values of $\tan β$, one of the parameters of the mSUGRA model. We found that for the explored regions of the parameter space, small values of tan$β$ are not favored; only for tan$β\simeq50$ are both criteria significantly consistent. In the region where both criteria are consistent we also found a lower bound for the neutralino mass, $m_χ\geq 141$ GeV.
description: 25 pages, 6 figures. Accepted for publication in JCAP
Moving intelligence to edge: distributed content storage and computation
Creators: name: Ozfatura, Mehmet Emre
Publisher: name: Imperial College London
Year: 2021

description: The recent advances in the areas of both wireless communication networks and machine learning applications together with the ever-increasing smart devices call a paradigm shift on the how the intelligence is located in the network. The conventional approaches locates the intelligence at the core of the network such as content storage or processing. However, rapid increases in the content streaming as well as increasing size of the computational process in parallel to available date, make transition from centralized to distributed setup indispensable. Hence, in this dissertation we analyze how this transition can be done efficiently, in both areas of content storage and computation. Accordingly, the dissertation consist of two main parts; first, where we study collaborative content storage and delivery, second, we study distributed computation. In the first part, we analyze collaborative content storage and delivery in heterogeneous cellular networks with a particular focus on the user mobility and content popularity. In the second part, we analyze the distributed computation frameworks with particular focus on the failure-tolerant strategies.
Gregoriano e lauda: alcune annotazioni sull’esperienza musicale liturgica e devozionale dei cattolici al tempo di Dante
Creators: name: Gozzi, Marco
Publisher: name: Pavia University Press - Edizioni dell'Università degli Studi di Pavia
Year: 2023

description: Il contributo intende indagare la prassi liturgica e la devozione dei laici cattolici al tempo di Dante. La conoscenza profonda che Dante dimostra di inni, salmi e sequenze in latino, gli derivano con ogni probabilità dalla frequentazione di una scuola di grammatica, forse presso i Francescani fiorentini. La scuola prevedeva uno studio molto mnemonico del latino collegato al canto di salmi, inni, sequenze ed antifone. La riflessione si rivolge poi ai manoscritti liturgici conservati di Francescani, Domenicani e Servi di Maria del tempo di Dante a Firenze e alla considerazione della liturgia della cattedrale di Santa Reparata. Anche nella Firenze del tempo di Dante emergono, per il canto liturgico, la diffusa prassi della polifonia semplice e l’uso frequente di canti ritmico-proporzionali, come anche una massiccia presenza di confraternite di laudesi, che praticano anche inni, sequenze e mottetti.
description: Philomusica on-line, Vol 22, N° 1 (2023): Musica e letteratura al tempo di Dante
คุณธรรมสำหรับผู้นำ
Creators: name: อุไรวรรณ ธนสถิตย์
Publisher: name: ศูนย์คุณธรรม (องค์การมหาชน)
Year: 2014
Subjects: คุณธรรมสำหรับผู้นำ,คุณธรรม,ผู้นำ

description: 1, 3, วารสารวิชาการคุณธรรมความดี