cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The mechanisms and energetics of nitrate uptake by marine phytoplankton
Creators: name: Falkowski, Paul Gordon
Publisher: name: University of British Columbia
Year: 2010

description: The results of this study suggest that NO^ uptake in many (but not all) species of marine phytoplankton is mediated by a membrane-bound (NO⁻₃, Cl⁻)-activated adenosine triphosphatase. In the presence of NO⁻₃ and Cl⁻, semi-purified membrane preparations exhibit enhanced adenosine triphosphatase activity. The enzyme has characteristics common to other membrane-bound proteins: a break in the Arrhenius plot of 30.9 Kcal/mole at 2.9 C, parallel purification with the (Na⁺ + K⁺)-activated transport adenosine triphosphatase, and activation of catalytic activity by non-ionic and anionic detergents. It is inferred from parallel purification of the (NO⁻₃,Cl⁻)-activated adenosine triphosphatase and the physiological kinetics of NO⁻₃ uptake by intact cells, that the enzyme translocates NO⁻₃ across the cell membrane, into the cytoplasm, against the chemical concentration gradient of the ion. The half-saturation constants for activation of the adenosine triphosphatase by NO⁻₃ are less than 1 µM for most species tested and correlate with half-saturation constants for NO⁻₃ uptake by whole cells. The three dinoflagellates tested did not exhibit any relationship between NO⁻₃ concentrations and ATP hydrolysis, and it is inferred that the (NO⁻₃,Cl⁻)-activated adenosine triphosphatase is probably absent from this group. Results of metabolic inhibitor studies (including KCN, 2,4-dinitrophenol, dichlorodimethylurea, and carbonyl cyanide m-chlorophenylhydrozone) imply that the source of ATP for the NO⁻₃ transport is primarily cyclic photo-phosphorylation in vivo. These results are consistent with observations of selective inhibition of NO⁻₃ uptake in unialgal cultures as well as in natural populations. Field studies with natural phytoplankton communities from Knight Inlet, B. C, suggest a physiological adaptation to external nitrogen concentrations may occur. This adaptation is characterized by increased intracellular chlorophyll a synthesis in response to 10-15% nitrogen enrichment over a 6-8 hr period. During the adaptive period carbon fixation is temporarily suppressed, apparently due to competition between inorganic carbon and inorganic nitrogen for high-energy nucleotides from the light reactions. The results of this study are related to previous proposals for the metabolic pathway of nitrogen in marine phytoplankton. In conclusion, a modified pathway is proposed stressing (1) group differences, in that nitrogen assimilation in dinoflagellates appears different from other groups, and (2) the energetics and biochemical feed-back controls of nitrogen assimilation.
Genetic Manipulation, Gene Silencing and Biomarker Development in Multiple Experimental Models.
Creators: name: De Cecco, Marco <1984>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: VET/02 Fisiologia veterinaria

description: The thesis is set in three different parts, according to the relative experimental models. First, the domestic pig (Sus scrofa) is part of the study on reproductive biotechnologies: the transgenesis technique of Sperm Mediated Gene Transfer is widely studied starting from the quality of the semen, through the study of multiple uptakes of exogenous DNA and lastly used in the production of multi-transgenic blastocysts. Finally we managed to couple the transgenesis pipeline with sperm sorting and therefore produced transgenic embryos of predetermined sex. 
In the second part of the thesis the attention is on the fruit fly (Drosophila melanogaster) and on its derived cell line: the S2 cells. The in vitro and in vivo models are used to develop and validate an efficient way to knock down the myc gene. First an efficient in vitro protocol is described, than we demonstrate how the decrease in myc transcript remarkably affects the ribosome biogenesis through the study of Polysome gradients, rRNA content and qPCR. In vivo we identified two optimal drivers for the conditional silencing of myc, once the flies are fed with RU486: the first one is throughout the whole body (Tubulin), while the second is a head fat body driver (S32). With these results we present a very efficient model to study the role of myc in multiple aspects of translation.
In the third and last part, the focus is on human derived lung fibroblasts (hLF-1), mouse tail fibroblasts and mouse tissues. We developed an efficient assay to quantify the total protein content of the nucleus on a single cell level via fluorescence. We coupled the protocol with classical immunofluorescence so to have at the same time general and particular information, demonstrating that during senescence nuclear proteins increase by 1.8 fold either in human cells, mouse cells and mouse tissues.
Synchronization of networks of piecewise-smooth systems
Creators: name: Coraggio, Marco
name: DeLellis, Pietro
name: Hogan, S. John
name: di Bernardo, Mario
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We study convergence in networks of piecewise-smooth (PWS) systems that commonly arise in applications to model dynamical systems whose evolution is affected by macroscopic events such as switches and impacts. Existing approaches were typically oriented toward guaranteeing global bounded synchronizability, local stability of the synchronization manifold, or achieving synchronization by exerting a control action on each node. Here we start by generalizing existing results on QUAD systems to the case of PWS systems, accounting for a large variety of nonlinear coupling laws. Then, we propose that a discontinuous coupling can be used to guarantee global synchronizability of a network of N PWS agents under mild assumptions on the individual dynamics. We provide extensive numerical simulations to gain insights on larger networks.
Discretely Holomorphic Parafermions and Integrable Loop Models
Creators: name: Ikhlef, Yacine
name: Cardy, John
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We define parafermionic observables in various lattice loop models, including examples where no Kramers-Wannier duality holds. For a particular rhombic embedding of the lattice in the plane and a value of the parafermionic spin these variables are discretely holomorphic (they satisfy a lattice version of the Cauchy-Riemann equations) as long as the Boltzmann weights satisfy certain linear constraints. In the cases considered, the weights then also satisfy the critical Yang-Baxter equations, with the spectral parameter being related linearly to the angle of the elementary rhombus.
description: 13 pages, 7 figures Added 2 references, corrected minor typos
Il trauma come “valore aggiunto”.  L’opera letteraria di Gustaaf Peek
Creators: name: Beltrami Gottmer, Chiara
Publisher: name: Firenze University Press
Year: 2014
Subjects: art; Dutch literature; illegal immigration; postcolonial studies; trauma

description: Gustaaf Peek is a Dutch writer and poet who translates art into words. His works are often harsh, difficult to understand for the reader and complicated. He hunts for unknown facts in history as well as in daily life, for instance, in his first novel Armin, with the monstrosity of the Lebensborn project in Nazi Germany, or in his second novel Dover where he discusses the reality of illegal immigration and warlords living in complete freedom in western towns. It is art for art’s sake. But the novels written by Peek also contain the red thread of traumatic experiences. All of his characters suffer from one or many traumas, and act consequently. To the author this was a kind of wake-up call, a new way to consider his work and a new way to engage in the literary world. The aim of this article is to try to explain where Peek wrote about trauma and how. His topics and writing methods have also been illustrated.
description: LEA - Lingue e Letterature d'Oriente e d'Occidente, Vol 2 (2013)
Alfven waves as a driving mechanism in stellar winds
Creators: name: Vidotto, A. A.
name: Jatenco-Pereira, V.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Alfven waves have been invoked as an important mechanism of particle acceleration in stellar winds of cool stars. After their identification in the solar wind they started to be studied in winds of stars located in different regions of the HR diagram. We discuss here some characteristics of these waves and we present a direct application in the acceleration of late-type stellar winds.
description: Accepted for publication in Advances in Space Research. Presented at the World Space Environment Forum 2007, Egypt. 9 pages, 2 figures
Supermassive Black-Hole Growth Over Cosmic Time: Active Galaxy Demography, Physics, and Ecology from Chandra Surveys
Creators: name: Brandt, W. N.
name: Alexander, D. M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Extragalactic X-ray surveys over the past decade have dramatically improved understanding of the majority populations of active galactic nuclei (AGNs) over most of the history of the Universe. Here we briefly highlight some of the exciting discoveries about AGN demography, physics, and ecology with a focus on results from Chandra. We also discuss some key unresolved questions and future prospects.
description: 7 pages, 4 figures, to appear in Proceedings of the National Academy of Sciences, invited review from the symposium "Chandra's First Decade of Discovery", September 2009, Boston, Massachusetts
Relevance of visco-plastic theory in a multi-directional inhomogeneous granular flow
Creators: name: Cortet, P. -P.
name: Bonamy, D.
name: Daviaud, F.
name: Dauchot, O.
name: Dubrulle, B.
name: Renouf, M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We confront a recent visco-plastic description of dense granular flows [P. Jop et al, Nature, {\bf 441} (2006) 727] with multi-directional inhomogeneous steady flows observed in non-smooth contact dynamics simulations of 2D half-filled rotating drums. Special attention is paid to check separately the two underlying fundamental statements into which the considered theory can be recast, namely (i) a single relation between the invariants of stress and strain rate tensors and (ii) the alignment between these tensors. Interestingly, the first prediction is fairly well verified over more than four decades of small strain rate, from the surface rapid flow to the quasi-static creep phase, where it is usually believed to fail because of jamming. On the other hand, the alignment between stress and strain rate tensors is shown to fail over the whole flow, what yields an apparent violation of the visco-plastic rheology when applied without care. In the quasi-static phase, the particularly large misalignment is conjectured to be related to transient dilatancy effects.
Adaptive and quasi-sliding control of shimmy in landing gears
Creators: name: Burbano-Lombana, Daniel A.
name: Coraggio, Marco
name: di Bernardo, Mario
name: Garofalo, Franco
name: Pugliese, Michele
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Shimmy is a dangerous phenomenon that occurs when aircraft's nose landing gears oscillate in a rapid and uncontrollable fashion. In this paper, we propose the use of two nonlinear control approaches (zero average control and model reference adaptive control based on minimal control synthesis) as simple yet effective strategies to suppress undesired oscillations, even in the presence of uncertainties and partial state measurements. Numerical results are presented to validate the proposed control approaches.
Tensor Generalizations of Affine Symmetry Vectors
Creators: name: Cook, Samuel A.
name: Dray, Tevian
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A definition is suggested for affine symmetry tensors, which generalize the notion of affine vectors in the same way that (conformal) Killing tensors generalize (conformal) Killing vectors. An identity for these tensors is proved, which gives the second derivative of the tensor in terms of the curvature tensor, generalizing a well-known identity for affine vectors. Additionally, the definition leads to a good definition of homothetic tensors. The inclusion relations between these types of tensors are exhibited. The relationship between affine symmetry tensors and solutions to the equation of geodesic deviation is clarified, again extending known results about Killing tensors.
description: 11 pages
Scalar-tensor cosmologies: general relativity as a fixed point of the Jordan frame scalar field
Creators: name: Kuusk, Piret
name: Jarv, Laur
name: Saal, Margus
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the evolution of homogeneous and isotropic, flat cosmological models within the general scalar-tensor theory of gravity with arbitrary coupling function and potential and scrutinize its limit to general relativity. Using the methods of dynamical systems for the decoupled equation of the Jordan frame scalar field we find the fixed points of flows in two cases: potential domination and matter domination. We present the conditions on the mathematical form of the coupling function and potential which determine the nature of the fixed points (attractor or other). There are two types of fixed points, both are characterized by cosmological evolution mimicking general relativity, but only one of the types is compatible with the Solar System PPN constraints.
description: 9 pages, talk at Seventh Alexander Friedmann International Seminar on Gravitation and Cosmology
Dark Stars: Död och Återuppståndelse
Creators: name: Spolyar, Douglas
name: Freese, Katherine
name: Gondolo, Paolo
name: Aguirre, Anthony
name: Bodenheimer, Peter
name: Sellwood, Jeremy A.
name: Yoshida, Naoki
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The first phase of stellar evolution in the history of the universe may be Dark Stars, powered by dark matter heating rather than by fusion. Weakly interacting massive particles, which are their own antiparticles, can annihilate and provide an important heat source for the first stars in the universe. This and the previous contribution present the story of Dark Stars. In this second part, we describe the structure of Dark Stars and predict that they are very massive ($\sim 800 M_\odot$), cool (6000 K), bright ($\sim 10^6 L_\odot$), long-lived ($\sim 10^6$ years), and probable precursors to (otherwise unexplained) supermassive black holes. Later, once the initial dark matter fuel runs out and fusion sets in, dark matter annihilation can predominate again if the scattering cross section is strong enough, so that a Dark Star is born again.
description: 3 pages, 1 figure, and conference proceeding for IDM Sweden
Reflectance of Rhenium as a Function of Pressure in a Diamond Anvil Cell
Creators: name: Song, Jing
name: Chuvashova, Irina
name: Silvera, Isaac F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have measured the reflectance of rhenium in the visible region to pressures up to 100 GPa in a diamond anvil cell (DAC). By photographing the reflecting surface, we visually show that there are challenges to obtaining accurate values in a DAC for several reasons and propose some useful procedures. We also show that knowledge of the reflectance of rhenium can overcome the problem of absorption of light by diamonds when studying the reflectance of materials at high pressure in a DAC.
description: 12 pages, 9 figures
Lorentz Violation in Goldstone Gravity
Creators: name: Carroll, Sean M.
name: Tam, Heywood
name: Wehus, Ingunn Kathrine
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider a theory of gravity in which a symmetric two-index tensor in Minkowski spacetime acquires a vacuum expectation value (vev) via a potential, thereby breaking Lorentz invariance spontaneously. When the vev breaks all the generators of the Lorentz group, six Goldstone modes emerge, two linear combinations of which have properties that are identical to those of the graviton in general relativity. Integrating out massive modes yields an infinite number of Lorentz-violating radiative-correction terms in the low-energy effective Lagrangian. We examine a representative subset of these terms and show that they modify the dispersion relation of the two propagating graviton modes such that their phase velocity is direction-dependent. If the phase velocity of the Goldstone gravitons is subluminal, cosmic rays can emit gravi-Cherenkov radiation, and the detection of high-energy cosmic rays can be used to constrain these radiative correction terms. Test particles in the vicinity of the Goldstone gravitons undergo longitudinal oscillations in addition to the usual transverse oscillations as predicted by general relativity. Finally, we discuss the possibility of having vevs that do not break all six generators and examine in detail one such theory.
description: 14 pages
Ferite nella carta. Il trauma nelle letterature europee contemporanee
Creators: name: Conterno, Chiara
name: Pelloni, Gabriella
name: Piva, Marika
name: Prandoni, Marco
name: Darra, Daniele
Publisher: name: Firenze University Press
Year: 2014
Subjects: trauma; letteratura; ferite; carta

description:
description: LEA - Lingue e Letterature d'Oriente e d'Occidente, Vol 2 (2013)
Yellow Supergiants in the Andromeda Galaxy (M31)
Creators: name: Drout, Maria R.
name: Massey, Philip
name: Meynet, Georges
name: Tokarz, Susan
name: Caldwell, Nelson
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The yellow supergiant content of nearby galaxies can provide a critical test of stellar evolution theory, bridging the gap between the hot, massive stars and the cool red supergiants. But, this region of the color-magnitude diagram is dominated by foreground contamination, requiring membership to somehow be determined. Fortunately, the large negative systemic velocity of M31, coupled to its high rotation rate, provides the means for separating the contaminating foreground dwarfs from the bona fide yellow supergiants within M31. Using the MMT, we obtained spectra of about 2900 stars, selected using the color and magnitude range to be yellow supergiants. Comparing the velocities to that of M31's rotation curve, we identified 54 certain, and 66 probable yellow supergiants from among the sea of foreground dwarfs. We find excellent agreement between the location of yellow supergiants in the H-R diagram and that predicted by the latest Geneva evolutionary tracks which include rotation. However, the relative number of yellow supergiants seen as a function of mass varies from that predicted by the models by a factor of more than 10, in the sense that more high mass yellow supergiants are predicted than are actually observed. Comparing the total number of yellow supergiants with masses above 20Mo with the estimated number of unevolved O stars indicates that the duration of the yellow supergiant phase is about 3000 years. This is consistent with what the 12Mo and 15Mo evolutionary tracks predict, but disagrees with the 20,000-80,000 year time scales predicted by the models for higher masses.
description: Accepted by the Astrophysical Journal
Deformed spaces and loop cosmology
Creators: name: Battisti, Marco Valerio
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The non-singular bouncing solution of loop quantum cosmology is reproduced by a deformed minisuperspace Heisenberg algebra. This algebra is a realization of the Snyder space, is almost unique and is related to the $κ$-Poincaré one. Since the sign of the deformation parameter it is not fixed, the Friedmann equation of braneworlds theory can also be obtained. Moreover, the sign is the only freedom in the picture and these frameworks are the only ones which can be reproduced by our deformed scheme. A generalized uncertainty principle for loop quantum cosmology is also proposed.
description: 5 pages, talk given at NEB-XIII Recent Developments in Gravity, Thessaloniki June 2008
A mildly relativistic radio jet from the otherwise normal Type Ic Supernova 2007gr
Creators: name: Paragi, Z.
name: Taylor, G. B.
name: Kouveliotou, C.
name: Granot, J.
name: Ramirez-Ruiz, E.
name: Bietenholz, M.
name: van der Horst, A. J.
name: Pidopryhora, Y.
name: van Langevelde, H. J.
name: Garrett, M. A.
name: Szomoru, A.
name: Argo, M.
name: Bourke, S.
name: Paczynski, B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The class of type Ic supernovae have drawn increasing attention since 1998 owing to their sparse association (only four so far) with long duration gamma-ray bursts. Although both phenomena originate from the core collapse of a massive star, supernovae emit mostly at optical wavelengths, whereas GRBs emit mostly in soft gamma-rays or hard X-rays. Though the GRB central engine generates ultra-relativistic jets, which beam the early emission into a narrow cone, no relativistic outflows have hitherto been found in type Ib/c supernovae explosions, despite theoretical expectations and searches. Here we report radio (interferometric) observations that reveal a mildly relativistic expansion in a nearby type Ic supernova, SN 2007gr. Using two observational epochs 60 days apart, we detect expansion of the source and establish a conservative lower limit for the average apparent expansion velocity of 0.6c. Independently, a second mildly relativistic supernova has been reported. Contrary to the radio data, optical observations of SN 2007gr indicate a typical type Ic supernova with ejecta velocities ~6000 km/s, much lower than in GRB-associated supernovae. We conclude that in SN 2007gr a small fraction of the ejecta produced a low-energy mildly relativistic bipolar radio jet, while the bulk of the ejecta were slower and, as shown by optical spectro-polarimetry, mildly aspherical.
description: Nature, 10 pages (including supplementary material), 2 figures
Frustrated classical Heisenberg model in 1 dimension with added nearest-neighbor biquadratic exchange interactions
Creators: name: Kaplan, T. A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The ground state phase diagram is determined for the frustrated classical Heisenberg chain with added nearest-neighbor biquadratic exchange interactions. There appear ferromagnetic, incommensurate-spiral, and up-up-down-down phases; a lock-in transition occurs at the spiral boundary. The model contains an isotropic version of the ANNNI model; it is also closely related to a model proposed for some manganites. The Luttinger-Tisza method is not obviously useful due to the non-linear weak-constraint problem; however the ground state is obtained analytically by the exact cluster method of Lyons and Kaplan. The results are compared to the model of Thorpe and Blume, where the Heisenberg part of the energy is not frustrated.
description: 4 pages, 3 figures
On completeness of description of an equilibrium canonical ensemble by reduced s-particle distribution function
Creators: name: Kalinin, M. I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this article it is shown that in a classical equilibrium canonical ensemble of molecules with $s$-body interaction full Gibbs distribution can be uniquely expressed in terms of a reduced s-particle distribution function. This means that whenever a number of particles $N$ and a volume $V$ are fixed the reduced $s$-particle distribution function contains as much information about the equilibrium system as the whole canonical Gibbs distribution. The latter is represented as an absolutely convergent power series relative to the reduced $s$-particle distribution function. As an example a linear term of this expansion is calculated. It is also shown that reduced distribution functions of order less than $s$ don't possess such property and, to all appearance, contain not all information about the system under consideration.
description: This work was reported on the International conference on statistical physics "SigmaPhi2008", Crete, Greece, 14-19 July 2008
Itinerari d’esilio, nel nome del Padre. Desde los blancos manicomios di Margarita Mateo Palmer
Creators: name: Scarabelli, Laura
Publisher: name: Università degli  Studi di Milano
Year: 2014
Subjects: Narrativa cubana contemporanea; Margarita Mateo Palmer; psicanalisi; Jacques Lacan; Massimo Recalcati

description: These are the signs that mark Margarita Mateo Palmer’s novel. This writing from the asylum challenges the preludes to immobility evoked by a place of order and restraint, thus enabling the emergence of a series of paths, which manage to shake the broken identity of the protagonist, Gelsomina, and of her time. Those intersections allow reflection on the contemporary Cuban condition, bent by the twilight of the revolutionary ideals, and at the same time to wonder about the human condition, savaged by the centripetal drive of consumerism and disposable worldviews, which are increasingly prone to wipe out any desiring tension in favour of magical objects of pleasure, hollow and ephemeral pret a porter [1] simulacra.
This paper aims to analyse the narrative structure of the novel by means of the tools offered by Massimo Recalcati’s interpretation of Lacan’s psychoanalysis. Particular attention will be devoted to the interplay between the protagonists, who embody clinical figures and also symbolise different dimensions of contemporary Cuban experience.

[1] This reading of the twilight of ideologies and of the vaporization of the Name of the Father is indebted to Massimo Recalcati’s thought (2010; 2011).
description: Altre Modernità, 2014: NUMERO SPECIALE Migrazioni, diaspora, esilio nelle letterature e culture ispanoamericane
Learning Online for Unified Segmentation and Tracking Models
Creators: name: Zhu, Tianyu
name: Ma, Rongkai
name: Harandi, Mehrtash
name: Drummond, Tom
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Tracking requires building a discriminative model for the target in the inference stage. An effective way to achieve this is online learning, which can comfortably outperform models that are only trained offline. Recent research shows that visual tracking benefits significantly from the unification of visual tracking and segmentation due to its pixel-level discrimination. However, it imposes a great challenge to perform online learning for such a unified model. A segmentation model cannot easily learn from prior information given in the visual tracking scenario. In this paper, we propose TrackMLP: a novel meta-learning method optimized to learn from only partial information to resolve the imposed challenge. Our model is capable of extensively exploiting limited prior information hence possesses much stronger target-background discriminability than other online learning methods. Empirically, we show that our model achieves state-of-the-art performance and tangible improvement over competing models. Our model achieves improved average overlaps of66.0%,67.1%, and68.5% in VOT2019, VOT2018, and VOT2016 datasets, which are 6.4%,7.3%, and6.4% higher than our baseline. Code will be made publicly available.
Power spectrum for the small-scale Universe
Creators: name: Widrow, Lawrence M.
name: Elahi, Pascal J.
name: Thacker, Robert J.
name: Richardson, Mark
name: Scannapieco, Evan
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The first objects to arise in a cold dark matter universe present a daunting challenge for models of structure formation. In the ultra small-scale limit, CDM structures form nearly simultaneously across a wide range of scales. Hierarchical clustering no longer provides a guiding principle for theoretical analyses and the computation time required to carry out credible simulations becomes prohibitively high. To gain insight into this problem, we perform high-resolution (N=720^3 - 1584^3) simulations of an Einstein-de Sitter cosmology where the initial power spectrum is P(k) propto k^n, with -2.5 < n < -1. Self-similar scaling is established for n=-1 and n=-2 more convincingly than in previous, lower-resolution simulations and for the first time, self-similar scaling is established for an n=-2.25 simulation. However, finite box-size effects induce departures from self-similar scaling in our n=-2.5 simulation. We compare our results with the predictions for the power spectrum from (one-loop) perturbation theory and demonstrate that the renormalization group approach suggested by McDonald improves perturbation theory's ability to predict the power spectrum in the quasilinear regime. In the nonlinear regime, our power spectra differ significantly from the widely used fitting formulae of Peacock & Dodds and Smith et al. and a new fitting formula is presented. Implications of our results for the stable clustering hypothesis vs. halo model debate are discussed. Our power spectra are inconsistent with predictions of the stable clustering hypothesis in the high-k limit and lend credence to the halo model. Nevertheless, the fitting formula advocated in this paper is purely empirical and not derived from a specific formulation of the halo model.
description: 30 pages including 10 figures; accepted for publication in MNRAS
Strong dependence of ultracold chemical rates on electric dipole moments
Creators: name: Quéméner, Goulven
name: Bohn, John L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We use the quantum threshold laws combined with a classical capture model to provide an analytical estimate of the chemical quenching cross sections and rate coefficients of two colliding particles at ultralow temperatures. We apply this quantum threshold model (QT model) to indistinguishable fermionic polar molecules in an electric field. At ultracold temperatures and in weak electric fields, the cross sections and rate coefficients depend only weakly on the electric dipole moment d induced by the electric field. In stronger electric fields, the quenching processes scale as d^{4(L+1/2)} where L>0 is the orbital angular momentum quantum number between the two colliding particles. For p-wave collisions (L=1) of indistinguishable fermionic polar molecules at ultracold temperatures, the quenching rate thus scales as d^6. We also apply this model to pure two dimensional collisions and find that chemical rates vanish as d^{-4} for ultracold indistinguishable fermions. This model provides a quick and intuitive way to estimate chemical rate coefficients of reactions occuring with high probability.
description: 10 pages, 8 figures
Reinaldo Arenas e il trauma delle dittature
Creators: name: Spadola, Carmelo Andrea
Publisher: name: Firenze University Press
Year: 2014
Subjects: Cuba; exile; gender studies; literature and politics; Reinaldo Arenas

description: Reinaldo Arenas is a Cuban writer known for his opposition to Fidel Castro’s regime. In his work Antes queanochezca. Autobiografía, written as a book of memories, the author recalls his life and minutely recounts his traumatic experience in prison as a homosexual protester, and his new life in the USA, experienced as being in exile. This article concentrates on a comparative study of the novel and screen adaptation, entitled Before Night Falls, directed by Julian Schnabel in 2000. If at the very beginning, Arenas is engaged against Cuban Communism, at the end of his life, he will consider that all political systems repressing freedom and dignity are equally reprehensible.
description: LEA - Lingue e Letterature d'Oriente e d'Occidente, Vol 2 (2013)
title: Learning and Application of Range Management Innovations Among Ranchers in West-Central Colorado
Creators: name: Kennedy, Caroline A.
Publisher: name: Utah State University
Year: 2005

description: Like many ranchers in the West, ranchers in West-Central Colorado are reevaluating their management strategies in the face of forces like drought, rising land prices, and encroaching development. While ranchers seek answers on alternative management strategies, research and Extension personnel search for adequate means of diffusing needed information. Relative to many rural western communities, ranchers in West-Central Colorado show high interest in alternative range management ideas, and many implement changes to their ranch management based on these ideas. This can partially be attributed to a unique support system of Extension and agency personnel with effective, untraditional outreach and land-management approaches. A survey was mailed to all 647 persons on the mailing list for the CSU Tri-River Extension Office, including Forest Service and BLM permittees in Mesa, Delta Montrose, San Miguel, Ouray, Hinsdale, Saguache, and Gunnison counties. The survey was designed to gain insight on how ranchers perceive current Extension efforts, how they learn new management information from peers and Extension/agency personnel, and how they apply these new ideas to their operations. Subsequent qualitative interviews with respondents gathered information on the process of adapting and implementing range management innovations into individual operations. This paper presents the findings of the survey and interviews, and implications for future outreach efforts.
title: Η επίδραση του μείγματος μάρκετινγκ και της εμπειρίας της μάρκας στην καθαρή θέση μάρκας
title: The effect of marketing mix and brand experience on brand equity
titleType: AlternativeTitle
Creators: name: Παπαδόγκωνας, Λυκούργος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2022
Subjects: Τακτικές μάρκετινγκ
Εμπειρία μάρκας
Καθαρή θέση μάρκας
Μείγμα μάρκετινγκ
Προϊόντα ταχείας κατανάλωσης
Πανδημία
Covid-19
Brand
Επωνυμία

description: Η πρόσφατη κρίση του κορονοϊού επηρέασε σημαντικά τόσο την παγκόσμια οικονομία όσο και τη συμπεριφορά καταναλωτή. Η αβεβαιότητα κι ο φόβος εντάθηκαν με αποτέλεσμα να αλλάξουν ριζικά οι αγοραστικές συνήθειες των καταναλωτών τόσο πανελλαδικώς όσο και παγκοσμίως. Πιο αναλυτικά, υπήρξε μεγάλη στροφή στα ταχυκίνητα προϊόντα και στην εμπειρία της μάρκας, ενώ συγχρόνως εντοπίστηκαν αλλαγές στις τακτικές μάρκετινγκ, ώστε να συμβαδίζουν με τις νέες αγοραστικές συνήθειες και προτιμήσεις. Οι ολοκληρωμένες στρατηγικές και τακτικές μάρκετινγκ και εμπειρίας στοχεύουν στη βελτίωση της αντιλαμβανόμενης και εμπορικής αξίας των επωνυμιών επηρεάζοντας τις αντιλήψεις των πελατών για την ποιότητα των προϊόντων. Σε γενικές γραμμές, εντοπίζεται ένα κενό στη βιβλιογραφία που αφορά την απουσία εμπειρικών μελετών που επικεντρώνονται στη καθαρή θέση της μάρκας από την οπτική πλευρά του πελάτη και στην αποδοτικότητα του μείγματος μάρκετινγκ, ιδίως στην περίπτωση των διαρκών καταναλωτικών αγαθών που προτιμούν οι Έλληνες καταναλωτές. Παράλληλα, υφίσταται ερευνητικό κενό σε ότι αφορά την επίδραση των διαστάσεων της εμπειρίας μάρκας στην καθαρή θέση. Αυτό το κενό καλύπτει η παρούσα διπλωματική εργασία, διενεργώντας ποσοτική έρευνα σε 204 καταναλωτές της Ελλάδας εστιάζοντας στην προτίμηση αγοράς μαρκών που προέρχονται από την προϊοντική κατηγορία των σαμπουάν, η οποία χαρακτηρίζεται από μέτρια προς χαμηλή ανάμιξη πελάτη. Κεντρικός σκοπός είναι η διερεύνηση της επίδρασης των διάφορων διαστάσεων της εμπειρίας μάρκας και των στοιχείων του μείγματος μάρκετινγκ στη καθαρή θέση, προτείνοντας στρατηγικές κατευθύνσεις που επηρεάζουν αποτελεσματικά τις αγοραστικές αποφάσεις των καταναλωτών. Τα ευρήματα της παρούσας μελέτης έδειξαν ότι το προϊόν, η εικόνα καταστήματος και συγκεκριμένες διαστάσεις της εμπειρίας της μάρκας, όπως η συναισθηματική, η γνωστική και η συμπεριφορική εμπειρία επιδρούν θετικά και στατιστικά σημαντικά στην καθαρή θέση. Δηλαδή, τα χαρακτηριστικά, η συσκευασία, η υφή και η ελκυστικότητα του προϊόντος σε συνδυασμό με την ύπαρξη θετικής εικόνας καταστήματος ενισχύουν τη δυναμική και την εμπορική αξία της επωνυμίας. Παράλληλα, η παροχή αξιομνημόνευτων συναισθηματικών, γνωστικών και συμπεριφορικών εμπειριών συμβάλουν προς αυτή την κατεύθυνση. Βάσει των συγκεκριμένων αποτελεσμάτων, παρέχονται στρατηγικές προτάσεις προς τους επαγγελματίες του κλάδου. Τέλος, παρατίθενται οι περιορισμοί και οι προτάσεις για μελλοντική έρευνα της παρούσας διπλωματικής εργασίας.
A Central Difference Graph Convolutional Operator for Skeleton-Based Action Recognition
Creators: name: Miao, Shuangyan
name: Hou, Yonghong
name: Gao, Zhimin
name: Xu, Mingliang
name: Li, Wanqing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: This paper proposes a new graph convolutional operator called central difference graph convolution (CDGC) for skeleton based action recognition. It is not only able to aggregate node information like a vanilla graph convolutional operation but also gradient information. Without introducing any additional parameters, CDGC can replace vanilla graph convolution in any existing Graph Convolutional Networks (GCNs). In addition, an accelerated version of the CDGC is developed which greatly improves the speed of training. Experiments on two popular large-scale datasets NTU RGB+D 60 & 120 have demonstrated the efficacy of the proposed CDGC. Code is available at https://github.com/iesymiao/CD-GCN.
description: Accepted by IEEE Transactions on Circuits and Systems for Video Technology (TCSVT)
In una lingua che non è la mia:  memoria, scrittura e separazione
Creators: name: D'Amora, Rosita
Publisher: name: Firenze University Press
Year: 2014
Subjects: identity; language; Ottoman empire; trauma; women’s autobiographies

description: This article explores the use of a foreign language in Ottoman women’s autobiographical writing that first appeared between the end of the 19th century and the beginning of the 20th century. By analyzing the texts of these authors writing about the self outside of their “mother tongue”, this article addresses the issue of language – in this case English – as a negotiated space for one’s own multiple identities, both with local and Western audiences. In particular, it examines to what extent the choice, however conscious, of using a foreign language engenders an identity break, a separation of the author from the world in which her memories were originally produced. Furthermore, this article seeks to determine the traumas that could motivate or arise from this choice.
description: LEA - Lingue e Letterature d'Oriente e d'Occidente, Vol 2 (2013)
Discovery of Red-Skewed K_alpha iron line in Cyg X-2 with Suzaku
Creators: name: Shaposhnikov, Nikolai
name: Titarchuk, Lev
name: Laurent, Philippe
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on the Suzaku observation of neutron star low-mass X-ray binary Cygnus X-2 which reveals a presence of the iron K_alpha emission line. The line profile shows a significant red wing. This discovery increases the number of neutron star sources where red-skewed iron lines were observed and strongly suggests that this phenomenon is common not only in black holes but also in other types of accreting compact objects. We examine the line profile in terms of models which attribute its production to the relativistic effects due to reflection of X-ray radiation from a cold accretion disk and also as a result of the line formation in the extended wind/outflow configuration. Both models are able to adequately represent the observed line profile. We consider the results of line modeling in the context of subsecond variability. While we were unable to conclusively disqualify one of the models, we find that the wind paradigm has several advantages over the relativistic disk reflection model.
description: accepted for publication in ApJ
Trends im wissenschaftlichen Publikationswesen
Creators: name: Mittermaier, Bernhard
Publisher: name: Forschungzentrum Jülich
Year: 2025

description: Interessensgruppe „Weiterentwicklung des wissenschaftlichen Publizierens“ im Allianz-Schwerpunkt „Digitalität in der Wissenschaft“, Germany, 1 Apr 2025 - 1 Apr 2025
Spin-torque driven ferromagnetic resonance in a nonlinear regime
Creators: name: Chen, W.
name: de Loubens, G.
name: Beaujour, J-M. L.
name: Sun, J. Z.
name: Kent, A. D.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin-valve based nanojunctions incorporating Co|Ni multilayers with perpendicular anisotropy were used to study spin-torque driven ferromagnetic resonance (ST-FMR) in a nonlinear regime. Perpendicular field swept resonance lines were measured under a large amplitude microwave current excitation, which produces a large angle precession of the Co|Ni layer magnetization. With increasing rf power the resonance lines broaden and become asymmetric, with their peak shifting to lower applied field. A nonhysteretic step jump in ST-FMR voltage signal was also observed at high powers. The results are analyzed in in terms of the foldover effect of a forced nonlinear oscillator and compared to macrospin simulations. The ST-FMR nonhysteretic step response may have applications in frequency and amplitude tunable nanoscale field sensors.
description: 4 pages, 3 figures, to appear in Applied Physics Letters
CIFRA National Survey: Uruguay September 2000
Creators: name: CIFRA, In Bogliaccini, Juan, And Queirolo Rosario Laboratorio De Opinión Pública And Redes Sociales En Uruguay Collection (Social Networks And Public Opinion Lab Collection)
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Sources of current events; interest in news; heating system in your home; Supergas (gas in Uruguay) vs. electricity; shopping for groceries; economic situation of your family; economic situation of the country; likability of politicians and presidential candidates; penalities for criminals; approval of Parliament; approval of president Jorge Batlle; approval of Judicial Court; financial problems in municipalities; sexual education in public schools; political spectrum position; past voting history. National Agency for Research and Innovation (ANII) Collection.
Spectral analysis of human evoked potentials
Creators: name: Davis, Alan Edwin
Publisher: name: University of British Columbia
Year: 2010

description: The purposes of this investigation were: (1) to apply spectral or frequency analysis to visual and auditory evoked potentials (EPs) recorded from the scalp; (2) to meaningfully relate the resulting frequency-domain descriptions to physiological factors such as speech dominance, stimulus modality and cortical area; (3) to determine if simple flash and click stimuli could generate left-to-right hemispheric differences, and if so; (4) to study various aspects of these differences, such as their relationship to handedness, speech dominance and stimulus modality. It was hypothesized that spectral analysis might detect EP differences that were not observable by measures of peak amplitudes and latencies, and that asymmetric responses could be generated by simple stimuli. Reviewed evidence suggested that verbal stimuli, such as speech or letters, were processed within the left, speech-dominant hemisphere, while non-verbal stimuli, such as geometric patterns or melodies, were processed within the right, speech non-dominant hemisphere. The results showed that EP amplitudes were largest over the specific projection cortex of the stimulated modality, but hemispheric differences of amplitudes were not related to the known speech dominance of epileptic patients. In contrast, coherence or similarity of form between pairs of EPs was related to speech dominance, and was greater over the speech-dominant hemisphere for click stimuli, and over the speech non-dominant hemisphere for flash stimuli. These results suggested that the amplitude of responses represented a bilateral cortical response to the sensory stimulus, while the lateralized, coherent spread represented perceptual processing or extraction of meaning from that stimulus.
title: Μεικτές κατανομές Poisson
title: Mixed Poisson distributions
titleType: AlternativeTitle
Creators: name: Κωστόπουλος, Βασίλειος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Μεικτές κατανομές
subject: Κατανομές Poisson
subject: Poisson

description: Στην παρούσα διπλωματική εργασία εξετάζουμε την οικογένεια των μεικτών κατανομών Poisson και εφαρμογές της στην αναλογιστική επιστήμη. Η εργασία αποτελείται από τρία κεφάλαια. Στο πρώτο κεφάλαιο γίνεται μια εισαγωγή στην μείξη κατανομών και σε ορισμένα βασικά χαρακτηριστικά τους. Επίσης δίνονται τα κυριότερα μοντέλα διακριτών και συνεχών κατανομών τα οποία θα μας απασχολήσουν στα επόμενα κεφάλαια. Στο δεύτερο κεφάλαιο παρουσιάζουμε τις μεικτές κατανομές Poisson, δίνουμε μια σειρά από χαρακτηριστικές ιδιότητές τους καθώς επίσης και μια αναλυτική παρουσίαση βασικών υποδειγμάτων μεικτών κατανομών Poisson. Τέλος, στο τρίτο κεφάλαιο, με τη βοήθεια της γλώσσας προγραμματισμού R, γίνεται προσαρμογή μερικών εκ των μεικτών κατανομών Poisson πάνω σε πραγματικά δεδομένα για την εξαγωγή συμπερασμάτων.
Spatial trends of non-collinear exchange coupling mediated by itinerant carriers with different Fermi surfaces
Creators: name: Lai, Hsin-Hua
name: Huang, Wen-Min
name: Lin, Hsiu-Hau
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the exchange coupling mediated by itinerant carriers with spin-orbit interaction by both analytic and numeric approaches. The mediated exchange coupling is non-collinear and its spatial trends depend on the Fermi surface topology of the itinerant carriers. Taking Rashba interaction as an example, the exchange coupling is similar to the conventional Ruderman-Kittel-Kasuya-Yosida type in weak coupling. On the other hand, in the strong coupling, the spiral interaction dominates. In addition, inclusion of finite spin relaxation always makes the non-collinear spiral exchange interaction dominant. Potential applications of our findings are explained and discussed.
description: 9 pages, 7 figures