cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Rotating azimuthons in dissipative Kerr media excited by superpositions of Bessel beams
Creators: name: Ruiz-Jiménez, Carlos
name: Leblond, Hervé
name: Porras, Miguel A.
name: Malomed, Boris A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We report the existence of persistently rotating azimuthons in media with self-focusing Kerr and absorption nonlinearities. The nonlinear loss is balanced by power influx from the peripheral reservoir stored in slowly decaying tails of the azimuthons. These modes are excited by a superposition of two Bessel beams with opposite vorticities, $\pm s$, and slightly different conicities. The excited azimuthon exhibits opposite vorticity in its center to that of the input Bessel-beam superposition due to spontaneous inversion of the topological charge in the course of the azimuthon formation. Unlike azimuthons in loss-free media, number $N$ of rotating intensity maxima and $s$ are not mutually independent, being related by $N=2s$. The robustness of the rotating azimuthons is enhanced in comparison to similar static dissipative patterns. They can be excited in almost any transparent material, in the range of intensities for which the nonlinear absorption, induced by multiphoton absorption, is relevant. Close to the ionization threshold, the rotating azimuthons reproduce recently observed helical filaments of light in air and CS$_{2}$.
description: To be published in Phys. Rev. A. 10 pages, 11 figures
Additional file 1 of Pseudoscorpion Wolbachia symbionts: diversity and evidence for a new supergroup S
Creators: name: Lefoulon, Emilie
name: Clark, Travis
name: Borveto, Fanni
name: Perriat-Sanguinet, Marco
name: Moulia, Catherine
name: Slatko, Barton E.
name: Gavotte, Laurent
Publisher: name: figshare
Year: 2020
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Evolutionary Biology

description: Additional file 1: Figure S1. Unrooted phylogenetic trees of Wolbachia based on 13 markers by Maximum Likelihood. Analysis based on concatenation of groEL, fabK, nuoG, NADH dehydrogenase I subunit F, aspS, gltA, coxA, ftsZ, wsp, orpB, nuoD, isocitrate dehydrogenase gene and the TPR domain-containing protein gene. The total length of the dataset is 6461 bp. The topology was inferred using Maximum Likelihood (ML) inference using IQ-TREE [39]. The Best-fit model, calculated using ModelFinder according to BIC index, was GTR + R3. Nodes are associated with Bootstrap values based on 1000 replicates and only bootstrap value superior to 70 are indicated. The Wolbachia supergroups (A–S) are indicated.
title: Langue contre musique : la discordance comme symptôme de la transgénéricité du lyrisme
Creators: name: Glatigny, Sandra
Publisher: name: Savoirs en prisme
Year: 2015

description: Depuis l’Antiquité, langue et musique sont associés au sein du lyrisme. De la mise en musique des textes de la Pléiade à la lyre du cœur de Lamartine, le système musical, « espressivo inexpressif » selon Jankélévitch (Jankélévitch, 1983 : 28), fournit une médiation pour exprimer l’indicible, l’infigurable, les émotions. La fin du romantisme semble sonner le glas de l’harmonie entre les deux arts. De fait, littérature et musique tendent à entrer en conflit au sein des œuvres de la deuxième moitié du XIXe. Pourtant, le lyrisme n’est pas mort et les systèmes se côtoient d’une manière féconde pour générer les émotions et renouveler leur expression. De l’influence de la chanson au « son-sens », les phénomènes structurants d’un point de vue auditif et linguistique révèlent les modalités paradoxales de cette concurrence. Le conflit intersémiotique menace bien évidemment l’intégrité de l’œuvre lyrique mais il nourrit également son caractère transgénérique de telle sorte que les systèmes musicaux et linguistiques favorisent la circulation des affects et modifient la réception du lecteur / auditeur pour renouveler le genre. La poétique de la discordance sémiotique n’interrompt pas le dialogue ancien entre langue et musique mais elle le pose dans des termes renouvelés. Si les enjeux idéologiques et esthétiques de la concurrence entre les deux systèmes demeurent, ils n’entravent pas pour autant les échanges des deux arts au sein de la littérature lyrique. Bien au contraire, le heurt met au jour une propriété fondamentale du lyrisme, à savoir sa transgénéricité. Dépassant les frontières entre sujet et objet, musique et littérature, le lyrisme met en place une configuration qui assure la circulation et la transmission émotionnelle dans un geste d’hybridation critique sans cesse réitéré.
description: Savoirs en prisme, No. 04 (2015): Langue et musique
The magnetic exciton of EuS revealed by resonant inelastic x-ray scattering
Creators: name: Amidani, Lucia
name: Joos, Jonas J.
name: Glatzel, Pieter
name: Kolorenc, Jindrich
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the valence-to-core resonant inelastic x-ray scattering (RIXS) of EuS measured at the L3 edge of Eu. The obtained data reveal two sets of excitations: one set is composed of a hole in the S 3p bands and an electron excited to extended Eu 5d band states, the other is made up from a hole in the Eu 4f states and an electron in localized Eu 5d states bound to the 4f hole by its Coulomb potential. The delocalized excitations arise from the dipole-allowed 5d to 2p emissions, whereas the localized excitations result from the dipole-forbidden (quadrupole-allowed) 4f to 2p emissions. Both these emission channels have a comparable intensity thanks to a small number of occupied 5d states (approximately 0.6) combined with a large number of occupied 4f states (seven). We identify the localized electron-hole pairs with the "magnetic excitons" suggested in the past as an interpretation of the sharp features seen in the optical absorption spectra. Our observations provide a direct experimental evidence of these excitons which has been missing up to now.
description: 7 pages, 4 figures, supplemental material (PDF, 8 pages) added as an ancillary file
Improving Market Access: The Role of Auctions in Converting Tariff-Rate Quotas into Single Tariffs
Creators: name: Joerin, Robert
name: Joerin, Robert
Publisher: name: Unknown
Year: 2009
Subjects: subject: International Relations/Trade
subject: Political Economy
subject: WTO
subject: Market Access
subject: Imperfect Competition
subject: Auctions

description: Market access in the WTO is highly fragmented due to exceptions from GATT principles. Tariff-rate quotas (TRQs) stand in contradiction to the principle of the GATT, according to which all quantitative restrictions in international trade should be eliminated. Bhagwati’s theorem of the non-equivalence of tariffs and quotas leads to the conclusion that under imperfect competition, market access can be improved by converting TRQs into single tariffs. In order to find the ‘new’ tariff, Bergsten (1987) proposed to auction quotas and to use the realized auction price for setting the equivalent tariff. There is empirical evidence from auctions of TRQs in Switzerland that the observed auction prices are below the equivalent tariffs. This is in line with the analysis of McAfee et al. (1999) that auction prices are considered as a useful lower bound for determining the equivalent tariffs. A change from quotas to tariffs will hardly raise protection but it may reduce price support by the new tariff. As a consequence, a country which replaces TRQs by single tariffs through auctions, in so doing, has already reduced tariffs to some extent. Finally, it is important that auctions are competitive and collusion among bidders can be prevented. In this regard, Lengwiler (1999) recommends the ‘variable supply’ auction format which resists collusion. This anti-collusive mechanism ensures competitive auctions in the event of high buyer’s concentration and imperfect competition.
Frequency Modulation of Spin-Transfer Oscillators
Creators: name: Pufall, M. R.
name: Rippard, W. H.
name: Kaka, S.
name: Silva, T. J.
name: Russek, S. E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Spin-polarized dc electric current flowing into a magnetic layer can induce precession of the magnetization at a frequency that depends on current. We show that addition of an ac current to this dc bias current results in a frequency modulated (FM) spectral output, generating sidebands spaced at the modulation frequency. The sideband amplitudes and shift of the center frequency with drive amplitude are in good agreement with a nonlinear FM model that takes into account the nonlinear frequency-current relation generally induced by spin transfer. Single-domain simulations show that ac current modulates the cone angle of the magnetization precession, in turn modulating the frequency via the demagnetizing field. These results are promising for communications and signal processing applications of spin-transfer oscillators.
description: 13 pages, 3 Figures
title: The elusive 'good' : how performance measures shape the US child support enforcement program
Creators: name: Macatangay, Ana Carolina
Publisher: name: University of St Andrews
Year: 2019

description: Performance measures do not just capture an organization’s ‘good performance’; they intervene in the valuation and construction of what counts as ‘good’ so it can be valued, enacted, and measured. This is the central theme of this thesis. Using a performativity lens, and drawing on valuation studies and the sociology of quantification, this research investigates the framing processes and mechanisms by which the federal performance measures, through a network of actors and devices, enable a U.S. child support enforcement agency to enact the ‘good performance’ that can be measured. Using ethnographic and case study methods, the study examines how actors and devices, through a framing process, qualify and negotiate the boundaries of their interactions to produce the ‘good performance’ that can be counted and measured. The boundaries they establish, however, produce overflows that potentially threaten the production of the qualified and quantified ‘good’. Such overflows emerge due to unexpected events, different versions of ‘good’, and conflicting frames of valuation of what counts as ‘good’. Based on the findings, the study offers a taxonomy of performative framing to explain how measures stimulate the organizing work of an agency so the ‘good performance’ can be organized, articulated, produced, and validated. It also offers a taxonomy of counter-performation to describe the uncertainties, multiplicities, and rivalries that the measured ‘good performance’ generates.
title: L' inclusion formelle. Essai d’une filiation entre Boulez et Mallarmé
Creators: name: Bonnec, Damien
Publisher: name: Savoirs en prisme
Year: 2015

description: Boulez aborda la poésie de Mallarmé dans les années 1950, soit dès ses premières années créatrices. De cette rencontre naîtra le cycle Pli selon pli commencé en 1958 et remanié pendant plus de trente ans, dans lequel le compositeur a exploité divers poèmes de Mallarmé. Toutefois, si la parenté semble facile à établir et l’influence de Mallarmé circonscrite uniquement à cinq pièces, nous nous apercevons en analysant l’œuvre du musicien que l’action latente du poète ne s’est pas arrêtée à ce cycle mais a irradié l’ensemble de sa musique. Si on en devine les contours et si l’attachement est à ce point profond, il reste à évaluer précisément les enjeux ainsi que les manifestations de cette affinité si particulière. Pierre Boulez a presque toujours fait référence à la puissance structurelle de la poésie mallarméenne, limitant parfois celle-ci à son seul angle formel. Il s’agira ici d’interpréter une telle lecture. Nous verrons en ce sens que l’incise est un procédé majeur et qu’il a irrigué la structure musicale des œuvres de Boulez, tant au niveau général de la forme qu’à un niveau plus local de l’invention musicale.
description: Savoirs en prisme, No. 04 (2015): Langue et musique
An efficient stochastic particle method for high-dimensional nonlinear PDEs
Creators: name: Lei, Zhengyang
name: Shao, Sihong
name: Xiong, Yunfeng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Numerical resolution of high-dimensional nonlinear PDEs remains a huge challenge due to the curse of dimensionality. Starting from the weak formulation of the Lawson-Euler scheme, this paper proposes a stochastic particle method (SPM) by tracking the deterministic motion, random jump, resampling and reweighting of particles. Real-valued weighted particles are adopted by SPM to approximate the high-dimensional solution, which automatically adjusts the point distribution to intimate the relevant feature of the solution. A piecewise constant reconstruction with virtual uniform grid is employed to evaluate the nonlinear terms, which fully exploits the intrinsic adaptive characteristic of SPM. Combining both, SPM can achieve the goal of adaptive sampling in time. Numerical experiments on the 6-D Allen-Cahn equation and the 7-D Hamiltonian-Jacobi-Bellman equation demonstrate the potential of SPM in solving high-dimensional nonlinear PDEs efficiently while maintaining an acceptable accuracy.
Spatially modulated and supersymmetric mass deformations of $\mathcal{N}=4$ SYM
Creators: name: Arav, Igal
name: Cheung, K. C. Matthew
name: Gauntlett, Jerome P.
name: Roberts, Matthew M.
name: Rosen, Christopher
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study mass deformations of $\mathcal{N}=4$, $d=4$ SYM theory that are spatially modulated in one spatial dimension and preserve some residual supersymmetry. We focus on generalisations of $\mathcal{N}=1^*$ theories and show that it is also possible, for suitably chosen supersymmetric masses, to preserve $d=3$ conformal symmetry associated with a co-dimension one interface. Holographic solutions can be constructed using $D=5$ theories of gravity that arise from consistent truncations of $SO(6)$ gauged supergravity and hence type IIB supergravity. For the mass deformations that preserve $d=3$ superconformal symmetry we construct a rich set of Janus solutions of $\mathcal{N}=4$ SYM theory which have the same coupling constant on either side of the interface. Limiting classes of these solutions give rise to RG interface solutions with $\mathcal{N}=4$ SYM on one side of the interface and the Leigh-Strassler (LS) SCFT on the other, and also to a Janus solution for the LS theory. Another limiting solution is a new supersymmetric $AdS_4\times S^1\times S^5$ solution of type IIB supergravity.
description: 78 pages, 19 figures. Minor changes, references added
Angular Distributions for 3,4 Lambda H Bound States in the 3,4 He(e,e'K+) reaction
Creators: name: Dohrmann, F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The 3Lambda H and 4Lambda H hypernuclear bound states have been observed for the first time in kaon electroproduction on 3,4He targets. The production cross sections have been determined at Q**2= 0.35 GeV**2 and W= 1.91 GeV. For either hypernucleus the nuclear form factor is determined by comparing the angular distribution of the 3,4He(e,e'K+)3,4Lambda H processes to the elementary cross section 1H(e,e'K+) Lambda on the free proton, measured during the same experiment.
description: 10 pages, 4 figures
The Assembly History of Field Spheroidals: Evolution of Mass-to-light Ratios and Signatures of Recent Star Formation
Creators: name: Treu, T.
name: Ellis, R. S.
name: Liao, T. X.
name: van Dokkum, P. G.
name: Tozzi, P.
name: Coil, A.
name: Newman, J.
name: Cooper, M.
name: Davis, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a comprehensive catalog of high signal-to-noise spectra obtained with the DEIMOS spectrograph on the Keck II telescope for a sample of F850LP<22.43 (AB) field spheroidal (E+S0s; 163) and bulge dominated disk (61) galaxies in the redshift range 0.2=-0.72^{+0.07}_{-0.05}\pm0.04. However, this evolution depends significantly on the dynamical mass, being slower for larger masses as reported in a previous letter. In addition, we separately show the intrinsic scatter of the FP increases with redshift as d(rms(M/L_{\rm B}))/dz=0.040\pm0.015. Although these trends are consistent with single burst populations which formed at $z_f>2$ for high mass spheroidals and z_{f}~1.2 for lower mass systems, a more realistic picture is that most of the stellar mass formed in all systems at z>2 with subsequent activity continuing to lower redshifts (z<1.2). The fraction of stellar mass formed at recent times depend strongly on galactic mass, ranging from <1% for masses above 10^{11.5} M_{\odot} to 20-40% below 10^{11} M_{\odot}. Independent support for recent activity is provided by spectroscopic ([\ion{O}{2}] emission, Hδ) and photometric (blue cores and broad-band colors) diagnostics. Via the analysis of a large sample with many independent diagnostics, we are able to reconcile previously disparate interpretations of the assembly history of field spheroidals. [Abridged]
description: 26 pages including 24 figures, submitted to ApJ. Complete and compact version with full resolution images available at http://www.astro.ucla.edu/~ttreu/ms.pdf
Issues, impacts, and prospects of the first transgenic crops tolerant to a herbicide. The case of glyphosate-tolerant soybean in the USA
Creators: name: Bonny, Sylvie
name: Bonny, Sylvie
Publisher: name: Unknown
Year: 2009
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Environmental Economics and Policy
subject: Production Economics
subject: Research and Development/Tech Change/Emerging Technologies
subject: Genetically modified crop
subject: GMO
subject: Biotechnology
subject: Agro-economic impact
subject: Environmental impact
subject: Sustainability
subject: Soybean
subject: Pesticide
subject: Weed
subject: Prospects
subject: Herbicide
subject: Glyphosate

description: Until today, herbicide-tolerant (HT) transgenic crops have been the most widely used type of transgenic crops. In 2008, worldwide, 63% of all agricultural land devoted to transgenic crops involved HT transgenic ones, and the percentage was higher (85%) when the herbicide-tolerant trait was stacked with another. In addition, other HT crops are foreseen within the next five years if we are to believe the "pipeline" of the companies involved along with field trials. However, herbicide-tolerant crops have been criticized, particularly in Europe, because of the type of trait introduced: herbicide tolerance. Indeed, this trait leads the crops to depend on a herbicide (generally glyphosate) instead of freeing them from some pesticides through a better use of their biological capacities and a valorisation of life processes as biotechnology was expected to do. Therefore, how can we explain the widespread use of HT transgenic crops and what are their fallouts? At first the paper presents the extent of surface areas dedicated to these crops and the factors that have led to the development of these herbicide-tolerant crops. Then, the case of glyphosate-tolerant soybeans in the USA is studied in more detail. Its agro-environmental impacts, particularly with regard to trends in the use of herbicides, are analyzed. Thirdly, we address the factors of adoption, economic performance, benefits, and drawbacks of this soybean as well as its prospects. Finally, the conclusion questions the contribution of HT soybean to more sustainable agriculture.
description: IAAE 2009 International Conference
title: Cuando los muertos narran y cantan: La puesta en música de la Antología de Spoon River de Edgar Lee Masters (1915) por Fabrizio De André (1971)
Creators: name: García Gil, Desirée
Publisher: name: Savoirs en prisme
Year: 2015

description: La publication de l’Anthologie de Spoon River en 1915 provoqua l’entrée d’Edgar Lee Masters, son auteur, dans le mouvement littéraire connu sous le nom de « Renaissance de Chicago ». L’œuvre a été reçue avec enthousiasme non seulement par les lecteurs – de dix-neuf réimpressions pour la première édition à environ soixante-dix en 1940 –, mais aussi par la critique et les intellectuels qui ont catalogué Masters comme « le père de la littérature moderne » (Pavese, 1962, 52). Ainsi, le cimetière de Spoon River – dont les morts et les épitaphes expliquent l’intra-histoire des charges et des professions qu’ils ont exercées durant leur existence – a attiré l’attention des musiciens de la deuxième moitié du xxe siècle. Parmi eux ressort notamment Fabrizio de André avec son album Non al denaro non all’amore né al cielo [Ni l’argent, ni l’amour, ni le ciel] (1971) – une adaptation libre pour guitare et voix. À travers une analyse musicale, littéraire et linguistique des œuvres mentionnées, l’investigation proposée aspire, d’une part, à [1] comprendre les procédés de composition utilisés afin de mettre en musique les textes cités et, d’autre part, à [2] comprendre quels sont les aspects poétiques, littéraires et linguistiques qui soulignent chacun des styles musicaux utilisés. Les conclusions éclaireront les concordances et les discordances qui existent entre la musique et le texte des deux œuvres constituant l’objet de cette étude.
description: Savoirs en prisme, No. 04 (2015): Langue et musique
Food Aid, External Trade and Domestic Markets: Implications for Food Security in Darfur
Creators: name: Dorosh, Paul A.
name: Subran, Ludovic
name: Dorosh, Paul A.
name: Subran, Ludovic
Publisher: name: Unknown
Year: 2009
Subjects: subject: Agricultural and Food Policy
subject: Demand and Price Analysis
subject: Food Security and Poverty
subject: International Relations/Trade
subject: Food Security
subject: Food Policy
subject: Trade

description: In the last decade, internal conflict has greatly hindered market transactions across regions of Sudan, especially transactions between Darfur and the Rest of Sudan. Food aid has helped to offset not only the absence of commercial inflows of grain, but also reductions in Darfur’s cereal production. This paper explores the determinants of cereal prices in Sudan utilizing a simple partial equilibrium framework for wheat and sorghum, the country’s two main food staples. We also present econometric evidence on the lack of integration of sorghum markets between Darfur and central Sudan, along with quantitative estimates of the impacts of food aid on market prices in the region. The paper concludes with a discussion of national food policy and the paradox of simultaneous commercial exports and large-scale food aid imports of sorghum.
Additional file 3 of Systematic review with network meta-analysis of randomized controlled trials of robotic-assisted arm training for improving activities of daily living and upper limb function after stroke
Creators: name: Mehrholz, Jan
name: Pollock, Alex
name: Pohl, Marcus
name: Kugler, Joachim
name: Elsner, Bernhard
Publisher: name: figshare
Year: 2020
Subjects: subject: Space Science
subject: Medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Additional file 3. Risk of bias of included studies.
Standing on the shoulders of giants: New mass and distance estimates for Betelgeuse through combined evolutionary, asteroseismic, and hydrodynamical simulations with MESA
Creators: name: Joyce, Meridith
name: Leung, Shing-Chi
name: Molnár, László
name: Ireland, Michael J.
name: Kobayashi, Chiaki
name: Nomoto, Ken'ichi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences
subject: 85-10, 85A15, 85A30

description: We conduct a rigorous examination of the nearby red supergiant Betelgeuse by drawing on the synthesis of new observational data and three different modeling techniques. Our observational results include the release of new, processed photometric measurements collected with the space-based SMEI instrument prior to Betelgeuse's recent, unprecedented dimming event. We detect the first radial overtone in the photometric data and report a period of $185\pm13.5$ d. Our theoretical predictions include self-consistent results from multi-timescale evolutionary, oscillatory, and hydrodynamic simulations conducted with the Modules for Experiments in Stellar Astrophysics (MESA) software suite. Significant outcomes of our modeling efforts include a precise prediction for the star's radius: $764^{+116}_{-62} R_{\odot}$. In concert with additional constraints, this allows us to derive a new, independent distance estimate of $168^ {+27}_{-15}$ pc and a parallax of $π=5.95^{+0.58}_{-0.85}$ mas, in good agreement with Hipparcos but less so with recent radio measurements. Seismic results from both perturbed hydrostatic and evolving hydrodynamic simulations constrain the period and driving mechanisms of Betelgeuse's dominant periodicities in new ways. Our analyses converge to the conclusion that Betelgeuse's $\approx 400$ day period is the result of pulsation in the fundamental mode, driven by the $κ$-mechanism. Grid-based hydrodynamic modeling reveals that the behavior of the oscillating envelope is mass-dependent, and likewise suggests that the non-linear pulsation excitation time could serve as a mass constraint. Our results place $α$ Ori definitively in the core helium-burning phase near the base of the red supergiant branch. We report a present-day mass of $16.5$--$19 ~M_{\odot}$---slightly lower than typical literature values.
description: v5: published in the Astrophysical Journal v3/v4: first revision with the Astrophysical Journal (v4: abstract corrected). v1/v2: submitted version and minor updates. Photometry available at https://konkoly.hu/staff/lmolnar/data/alpha_Ori_SMEI_1d-avg_native-plus-Vmag.txt
TivNe-SLAM: Dynamic Mapping and Tracking via Time-Varying Neural Radiance Fields
Creators: name: Duan, Chengyao
name: Yang, Zhiliu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Previous attempts to integrate Neural Radiance Fields (NeRF) into the Simultaneous Localization and Mapping (SLAM) framework either rely on the assumption of static scenes or require the ground truth camera poses, which impedes their application in real-world scenarios. This paper proposes a time-varying representation to track and reconstruct the dynamic scenes. Firstly, two processes, a tracking process and a mapping process, are maintained simultaneously in our framework. In the tracking process, all input images are uniformly sampled and then progressively trained in a self-supervised paradigm. In the mapping process, we leverage motion masks to distinguish dynamic objects from the static background, and sample more pixels from dynamic areas. Secondly, the parameter optimization for both processes is comprised of two stages: the first stage associates time with 3D positions to convert the deformation field to the canonical field. The second stage associates time with the embeddings of the canonical field to obtain colors and a Signed Distance Function (SDF). Lastly, we propose a novel keyframe selection strategy based on the overlapping rate. Our approach is evaluated on two synthetic datasets and one real-world dataset, and the experiments validate that our method achieves competitive results in both tracking and mapping when compared to existing state-of-the-art NeRF-based dynamic SLAM systems.
Self Attention with Temporal Prior: Can We Learn More from Arrow of Time?
Creators: name: Kim, Kyung Geun
name: Lee, Byeong Tak
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Many diverse phenomena in nature often inherently encode both short- and long-term temporal dependencies, which especially result from the direction of the flow of time. In this respect, we discovered experimental evidence suggesting that interrelations of these events are higher for closer time stamps. However, to be able for attention-based models to learn these regularities in short-term dependencies, it requires large amounts of data, which are often infeasible. This is because, while they are good at learning piece-wise temporal dependencies, attention-based models lack structures that encode biases in time series. As a resolution, we propose a simple and efficient method that enables attention layers to better encode the short-term temporal bias of these data sets by applying learnable, adaptive kernels directly to the attention matrices. We chose various prediction tasks for the experiments using Electronic Health Records (EHR) data sets since they are great examples with underlying long- and short-term temporal dependencies. Our experiments show exceptional classification results compared to best-performing models on most tasks and data sets.
Operational Models for Improving the Targeting Efficiency of Agricultural and Development Policies: A systematic comparison of different estimation methods using out-of-sample tests
Creators: name: Houssou, Nazaire
name: Zeller, Manfred
name: Houssou, Nazaire
name: Zeller, Manfred
Publisher: name: Unknown
Year: 2009
Subjects: subject: Agricultural and Food Policy
subject: Agricultural Finance
subject: Community/Rural/Urban Development
subject: Food Security and Poverty
subject: International Development
subject: Political Economy
subject: Research Methods/ Statistical Methods
subject: Malawi
subject: poverty targeting
subject: predictions
subject: proxy means tests
subject: out-of-sample tests
subject: ROC curve
subject: bootstrap

description: Accurate targeting is key for the success of any development policy. While a number of factors might explain low targeting efficiency such as governance failure, political interference or lack of political will, this paper focuses on improving indicator-based models that identify poor households and smallholder farmers more accurately. Using stepwise regressions along with out-of-sample validation tests and receiver operating characteristic curves, this paper develops proxy means tests models for rural and urban Malawi. The models developed have proved their validity in an independent sample and therefore, can be used to target a wide range of development policies to the poor. This makes the models a potentially interesting policy tool for the country.
Effective interaction between guest charges immersed in 2D jellium
Creators: name: Šamaj, Ladislav
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The model under study is an infinite 2D jellium of pointlike particles with elementary charge $e$, interacting via the logarithmic potential and in thermal equilibrium at the inverse temperature $β$. Two cases of the coupling constant $Γ\equiv βe^2$ are considered: the Debye-Hückel limit $Γ\to 0$ and the free-fermion point $Γ=2$. In the most general formulation, two guest particles, the one with charge $q e$ (the valence $q$ being an arbitrary integer) and the hard core of radius $σ>0$ and the pointlike one with elementary charge $e$, are immersed in the bulk of the jellium at distance $d\ge σ$. Two problems are of interest: the asymptotic large-distance behavior of the excess charge density induced in the jellium and the effective interaction between the guest particles. Technically, the induced charge density and the effective interaction are expressed in terms of multi-particle correlations of the pure (translationally invariant) jellium system. It is shown that the separation form of the induced charge density onto its radial and angle parts, observed previously in the limit $Γ\to 0$, is not reproduced at the coupling $Γ=2$. Based on an exact expression for the effective interaction between guest particles at $Γ=2$, oppositely ($q=0,-1,-2,\ldots$) charged guest particles always attract one another while likely ($q=1,2,\ldots$) charged guest particles repeal one another up to a certain distance $d$ between them and then the mutual attraction takes place up to asymptotically large (finite) distances.
description: 25 pages, 5 figures
Democracy through drama
Creators: name: Superstein, Andrea
Publisher: name: University of British Columbia
Year: 2009

description: Democracy Through Drama is a performative research inquiry investigating the connections between critical pedagogy, students empowerment and a drama curriculum. The curriculum was developed and implemented with a group of elementary school students to determine whether democracy in the classroom was possible to achieve through performance. The students were asked to choose a theme and then to write and perform a play on the theme. Using improvisation activities, writing prompts and group discussion, the group created and rehearsed scenes which were then organized into a nonlinear performance piece based on the subject of 'School' All aspects of the project were documented on film by the students and are incorporated into the thesis. Based on the responses of student interviews, it can be concluded that dramatic activities in the classroom promoted student empowerment and student voice in this case. Highlighted components include a montage of the rehearsal process, the final performance, interviews and reflections of the students, comments from the director and a slide show bibliography. Programs used to create the DVD were iMovie 3.0 and iDVD 3.0. The total video file size is 4.16 GB. Graphic design and liner notes were constructed with InDesign 2.0.1 and Photoshop 7.0. Total file size for liner notes package is 778 KB.
"Tattered" membrane
Creators: name: Doussal, Pierre Le
name: Radzihovsky, Leo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Ideal crystalline membranes, realized by graphene and other atomic monolayers, exhibit rich physics - a universal anomalous elasticity of the critical "flat" phase characterized by a negative Poisson ratio, universally singular elastic moduli, order-from-disorder and a crumpling transition. We formulate a generalized $D$-dimensional field theory, parameterized by an $O(d)\times O(D)$ tensor field with an {\it energetic} longitudinal constraint. For a soft constraint the resulting field theory describes a new class of a fluctuating "tattered" membranes, exhibiting a nonzero density of topological connectivity defects - slits, cracks and faults at an effective medium level. For hard, infinite-coupling constraint, the model reproduces the conventional crystalline membrane and its crumpling transition, and thereby demonstrates the essence of the difference between an elastic membrane and conventional field theories. Two additional fixed points emerge within the critical manifold, (i) globally attractive, "isotropic" $O(d)\times O(D)$, and (ii) "transverse", which in $D=2$ is the exact "dual" of the elastic membrane. Their properties are obtained in general $D,d$ from the renormalization group and the self-consistent screening analyses.
description: 6 pages + 25 pages of Supplemental Material, 2 figures
Molecular gas in the Andromeda galaxy
Creators: name: Nieten, Ch.
name: Neininger, N.
name: Guelin, M.
name: Ungerechts, H.
name: Lucas, R.
name: Berkhuijsen, E. M.
name: Beck, R.
name: Wielebinski, R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a new 12CO(J=1-0)-line survey of the Andromeda galaxy, M31, covering the bright disk with the highest resolution to date (85 pc along the major axis), observed On-the-Fly (in italics) with the IRAM 30-m telescope. We discuss the distribution of the CO emission and compare it with the distributions of HI and emission from cold dust traced at 175mum. Our main results are: 1. Most of the CO emission comes from the radial range R=3-16 kpc, but peaks near R=10 kpc. The emission is con- centrated in narrow, arm-like filaments defining two spiral arms with pitch angles of 7d-8d. The average arm-interarm brightness ratio along the western arms reaches 20 compared to 4 for HI. 2. For a constant conversion factor Xco, the molecular fraction of the neutral gas is enhanced in the arms and decreases radially. The apparent gas-to-dust ratios N(HI)/I175 and (N(HI)+2N(H2))/I175 increase by a factor of 20 between the centre and R=14 kpc, whereas the ratio 2N(H2)/I175 only increases by a factor of 4. Implications of these gradients are discussed. In the range R=8-14 kpc total gas and cold dust are well correlated; molecular gas is better correlated with cold dust than atomic gas.
description: 21 pages, 16 figures. Accepted for publication in A&A
title: La musicalité de la comptine vietnamienne
Creators: name: Bui-Aurenche, Thu Thuy
Publisher: name: Savoirs en prisme
Year: 2015

description: La comptine implique un jeu sur la musicalité de la langue, à tel point que pour ce genre de patrimoine oral, on retient le son et le rythme plus que le sens des mots. Le vietnamien est une langue tonale où chacun des six tons est caractérisé par un jeu complexe de fréquences sonores. Cette musicalité, intrinsèque aux mots, jointe à des constructions prosodiques (césure, rythme…) et structurales (rime, écho…) variées, confère aux comptines un mouvement sonore très riche. Cela nourrit la sensibilité poétique de l’enfant tout en participant à son apprentissage de la langue et à son éveil sur le monde extérieur. Dans le cas des devinettes et formulettes, ce sont les tons qui créent une véritable ligne mélodique et leur construction fait penser aux règles de l’harmonie et du contrepoint. Dans les chants enfantins et les berceuses, la partition et les ornements musicaux sont souvent calqués sur la musique des mots.
description: Savoirs en prisme, No. 04 (2015): Langue et musique
A spatial bio-economic modelling approach on the trade-offs between global bioenergy demand, agricultural intensification, expansion, and trade
Creators: name: Lotze-Campen, Hermann
name: Popp, Alexander
name: Beringer, Tim
name: Muller, Christoph
name: Lucht, Wolfgang
name: Lotze-Campen, Hermann
name: Popp, Alexander
name: Beringer, Tim
name: Muller, Christoph
name: Lucht, Wolfgang
Publisher: name: Unknown
Year: 2009
Subjects: subject: Environmental Economics and Policy
subject: International Development
subject: International Relations/Trade
subject: Land Economics/Use
subject: Research and Development/Tech Change/Emerging Technologies
subject: Land use change
subject: Spatial modelling
subject: Technological change

description: Increased future demands for food, fibre and fuels from biomass can only be met if the available land and water resources on a global scale are used and managed as efficiently as possible. The main routes for making the global agricultural system more productive are through intensification and technological change on currently used agricultural land, land expansion into currently non-agricultural areas, and international trade in agricultural commodities and processed goods. In order to analyse the trade-offs and synergies between these options, we present a global bio-economic modelling approach with a special focus on spatially explicit land and water constraints as well as technological change in agricultural production. For a given bioenergy demand scenario until the middle of the 21st century and different land allocation options, we analyse the required rate of productivity increase on agricultural land as well as the implicit values (shadow prices) of limited land and water resources. The shadow prices for bioenergy are provided as a metric for assessing the trade-offs between different land allocation options.
Exchange Rate Sensitivity of Fresh Tomatoes Imports from Mexico to the United States
Creators: name: Jaramillo-Villanueva, Jose Luis
name: Sarker, Rakhal
name: Jaramillo-Villanueva, Jose Luis
name: Sarker, Rakhal
Publisher: name: Unknown
Year: 2009
Subjects: subject: Agricultural and Food Policy
subject: International Relations/Trade
subject: Exchange rate
subject: exchange rate volatility
subject: fresh tomatoes trade
subject: NAFTA
subject: cointegration analysis and error-correction modelling

description: The agri-food trade between Mexico and the United States grew substantially after the implementation of NAFTA in 1994. While some analysts argue that NAFTA has contributed the most to the dramatic expansion of this trade, others have emphasized the role played by the exchange rate in this process. An attempt is made in this paper to address this issue by quantifying the effects of NAFTA, the Mexico-US exchange rate changes and its volatility on the fresh tomato imports into the United States from Mexico using the maximum likelihood cointegration analysis. The results from the cointegration analysis show that while changes in exchange rate have a positive effect on trade flows, volatility of the exchange rate has a significant negative effect on trade flows. The results from the error-correction model show that both NAFTA and the exchange rate have significant positive influence on fresh tomato imports in the United States from Mexico. However, the effects of exchange rate changes outweigh the effects of NAFTA in the short-run
Low-error encoder for time-bin and decoy states for quantum key distribution
Creators: name: Scalcon, Davide
name: Bazzani, Elisa
name: Vallone, Giuseppe
name: Villoresi, Paolo
name: Avesani, Marco
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Time-bin encoding has been widely used for implementing quantum key distribution (QKD) on optical fiber channels due to its robustness with respect to drifts introduced by the optical fiber. However, due to the use of interferometric structures, achieving stable and low intrinsic Quantum Bit Error rate (QBER) in time-bin systems can be challenging. A key device for decoy-state prepare & measure QKD is represented by the state encoder, that must generate low-error and stable states with different values of mean photon number. Here we propose the MacZac (Mach-Zehder-Sagnac), a time-bin encoder with ultra-low intrinsic QBER (<2e-5) and high stability. The device is based on nested Sagnac and Mach-Zehnder interferometers and uses a single phase modulator for both decoy and state preparation, greatly simplifying the optical setup. The encoder does not require any active compensation or feedback system and it can be scaled for the generation of states with arbitrary dimension. We experimentally realized and tested the device performances as a stand alone component and in a complete QKD experiments. Thanks to the capacity to combine extremely low QBER, high stability and experimental simplicity the proposed device can be used as a key building block for future high-performance, low-cost QKD systems.
description: 12 pages, 14 figures
title: La traducción de canciones en el cine de animación
Creators: name: De Los Reyes Lozano, Julio
Publisher: name: Savoirs en prisme
Year: 2015

description: Cette contribution explore les différentes stratégies et choix adoptés lors de la traduction de chansons au cinéma. Si dans les films en prise de vue réelle les chansons sont souvent sous-titrées, dans le cinéma d’animation le doublage est le mode de traduction audiovisuelle habituel car les enfants, grands amateurs de ces films, n’ont pas complètement développé la compétence de la lecture. L’élaboration de paroles « chantables » et le respect des conventions du doublage obligent le traducteur à faire des choix en tenant compte des plans visuel, musical et linguistique du texte. L’analyse des versions espagnole, française et italienne de Let it go, succès planétaire extrait du film Disney La Reine des Neiges (2013), nous montre quelques exemples des approches et priorités des adaptateurs.
description: Savoirs en prisme, No. 04 (2015): Langue et musique
General relativity as a special case of Poincaré gauge gravity
Creators: name: Obukhov, Yuri N.
name: Hehl, Friedrich W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We demonstrate that Einstein's general relativity theory arises as a special case in the framework of the Poincaré gauge theory of gravity under the assumption of a suitable nonminimal coupling of matter to the Riemann-Cartan geometry of spacetime.
description: 21 pages, Revtex style, minor corrections, references added
Quantum Statistics and Entanglement of Two Electromagnetic Field Modes Coupled via a Mesoscopic SQUID Ring
Creators: name: Everitt, M. J.
name: Clark, T. D.
name: Stiffell, P.
name: Prance, H.
name: Prance, R. J.
name: Vourdas, A.
name: Ralph, J. F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper we investigate the behaviour of a fully quantum mechanical system consisting of a mesoscopic SQUID ring coupled to one or two electromagnetic field modes. We show that we can use a static magnetic flux threading the SQUID ring to control the transfer of energy, the entanglement and the statistical properties of the fields coupled to the ring. We also demonstrate that at, and around, certain values of static flux the effective coupling between the components of the system is large. The position of these regions in static flux is dependent on the energy level structure of the ring and the relative field mode frequencies, In these regions we find that the entanglement of states in the coupled system, and the energy transfer between its components, is strong.
description: 15 pages, 19 figures, Uploaded as implementing a policy of arXiving old papers
title: L' accent français de la zarzuela, un défi poético-musical : de L’Étoile du Nord à Catalina
Creators: name: Porto San Martin, Isabelle
Publisher: name: Savoirs en prisme
Year: 2015

description: La zarzuela, genre lyrique et théâtral espagnol, connut un nouvel essor à partir de 1849. En effet, une génération de compositeurs, guidés par Francisco Asenjo Barbieri (1823-1894), forma le projet d’en faire une scène nationale. La manière dont certains musiciens et auteurs élaborèrent ce nouveau répertoire suscite l’intérêt. De nombreuses œuvres furent inspirées du théâtre lyrique français et plus particulièrement de l’opéra-comique. Nous avons essayé de lever ce paradoxe en analysant d’un point de vue littéraire et musical un exemple emblématique : L’Étoile du Nord composée par Giacomo Meyerbeer (1791-1864) et créée à Paris le 16 février 1854, et Catalina composée par Joaquín Gaztambide (1822-1870) et créée quelques mois plus tard à Madrid le 23 octobre 1854. Le livret était adapté par le célèbre auteur Luis Olona (1823-1863). Les choix effectués pour réaliser une œuvre originale révèlent un aspect essentiel du phénomène : loin d’être un atavisme, l’influence française a été un moteur pour laisser libre cours à la créativité espagnole.
description: Savoirs en prisme, No. 04 (2015): Langue et musique