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Constituent Parsing as Sequence LabelingOct 21 2018We introduce a method to reduce constituent parsing to sequence labeling. For each word w_t, it generates a label that encodes: (1) the number of ancestors in the tree that the words w_t and w_{t+1} have in common, and (2) the nonterminal symbol at the ... More

Transition-based Parsing with Lighter Feed-Forward NetworksOct 21 2018We explore whether it is possible to build lighter parsers, that are statistically equivalent to their corresponding standard version, for a wide set of languages showing different structures and morphologies. As testbed, we use the Universal Dependencies ... More

Speeding Up Natural Language Parsing by Reusing Partial ResultsApr 06 2019This paper proposes a novel technique that applies case-based reasoning in order to generate templates for reusable parse tree fragments, based on PoS tags of bigrams and trigrams that demonstrate low variability in their syntactic analyses from prior ... More

Sequence Labeling Parsing by Learning Across RepresentationsJul 02 2019We use parsing as sequence labeling as a common framework to learn across constituency and dependency syntactic abstractions. To do so, we cast the problem as multitask learning (MTL). First, we show that adding a parsing paradigm as an auxiliary loss ... More

Artificially Evolved Chunks for Morphosyntactic AnalysisAug 09 2019We introduce a language-agnostic evolutionary technique for automatically extracting chunks from dependency treebanks. We evaluate these chunks on a number of morphosyntactic tasks, namely POS tagging, morphological feature tagging, and dependency parsing. ... More

Liberating language research from dogmas of the 20th centurySep 09 2015Feb 27 2016A commentary on the article "Large-scale evidence of dependency length minimization in 37 languages" by Futrell, Mahowald & Gibson (PNAS 2015 112 (33) 10336-10341).

Viable Dependency Parsing as Sequence LabelingFeb 27 2019Mar 29 2019We recast dependency parsing as a sequence labeling problem, exploring several encodings of dependency trees as labels. While dependency parsing by means of sequence labeling had been attempted in existing work, results suggested that the technique was ... More

Dynamic Oracles for Top-Down and In-Order Shift-Reduce Constituent ParsingOct 25 2018We introduce novel dynamic oracles for training two of the most accurate known shift-reduce algorithms for constituent parsing: the top-down and in-order transition-based parsers. In both cases, the dynamic oracles manage to notably increase their accuracy, ... More

Left-to-Right Dependency Parsing with Pointer NetworksMar 20 2019We propose a novel transition-based algorithm that straightforwardly parses sentences from left to right by building $n$ attachments, with $n$ being the length of the input sentence. Similarly to the recent stack-pointer parser by Ma et al. (2018), we ... More

Towards Making a Dependency Parser SeeSep 03 2019We explore whether it is possible to leverage eye-tracking data in an RNN dependency parser (for English) when such information is only available during training, i.e., no aggregated or token-level gaze features are used at inference time. To do so, we ... More

Artificially Evolved Chunks for Morphosyntactic AnalysisAug 09 2019Aug 21 2019We introduce a language-agnostic evolutionary technique for automatically extracting chunks from dependency treebanks. We evaluate these chunks on a number of morphosyntactic tasks, namely POS tagging, morphological feature tagging, and dependency parsing. ... More

Anti dependency distance minimization in short sequences. A graph theoretic approachJun 13 2019Jul 14 2019Dependency distance minimization (DDm) is a word order principle favouring the placement of syntactically related words close to each other in sentences. Massive evidence of the principle has been reported for more than a decade with the help of syntactic ... More

The scaling of the minimum sum of edge lengths in uniformly random treesFeb 25 2016May 06 2016The minimum linear arrangement problem on a network consists of finding the minimum sum of edge lengths that can be achieved when the vertices are arranged linearly. Although there are algorithms to solve this problem on trees in polynomial time, they ... More

Memory limitations are hidden in grammarAug 19 2019The ability to produce and understand an unlimited number of different sentences is a hallmark of human language. Linguists have sought to define the essence of this generative capacity using formal grammars that describe the syntactic dependencies between ... More

Towards Syntactic Iberian Polarity ClassificationAug 17 2017Lexicon-based methods using syntactic rules for polarity classification rely on parsers that are dependent on the language and on treebank guidelines. Thus, rules are also dependent and require adaptation, especially in multilingual scenarios. We tackle ... More

Properties of galaxies at the faint end of the H$α$ luminosity function at $z\sim0.62$Apr 15 2016Aug 05 2016Studies measuring the star formation rate density, luminosity function, and properties of star-forming galaxies are numerous. However, it exists a gap at $0.5<z<0.8$ in H$\alpha$-based studies. Our main goal is to study the properties of a sample of faint ... More

Transient Propagation and Scattering of Quasi-Rayleigh Waves in Plates: Quantitative comparison between Pulsed TV-Holography Measurements and FC(Gram) elastodynamic simulationsMay 13 2019May 27 2019We study the scattering of transient, high-frequency, narrow-band quasi-Rayleigh elastic waves by through-thickness holes in aluminum plates, in the framework of ultrasonic nondestructive testing (NDT) based on full-field optical detection. Sequences ... More

Linear nonlocal diffusion problems in metric measure spacesDec 17 2014The aim of this paper is to provide a comprehensive study of some linear nonlocal diffusion problems in metric measure spaces. These include, for example, open subsets in $\mathbb{R}^N$, graphs, manifolds, multi-structures or some fractal sets. For this, ... More

Zeckendorf representations with at most two terms to x-coordinates of Pell equationsMar 28 2018In this paper, we find all positive squarefree integers d such that the Pell equation X2-dY2 = +-1 has at least two positive integer solutions (X,Y) and (X',Y') such that both X and X' have Zeckendorf representations with at most two terms. This paper ... More

Personalised aesthetics with residual adaptersJul 08 2019The use of computational methods to evaluate aesthetics in photography has gained interest in recent years due to the popularization of convolutional neural networks and the availability of new annotated datasets. Most studies in this area have focused ... More

On the relation between dependency distance, crossing dependencies, and parsing. Comment on "Dependency distance: a new perspective on syntactic patterns in natural languages" by Haitao Liu et alMay 27 2017Jun 03 2017Liu et al. (2017) provide a comprehensive account of research on dependency distance in human languages. While the article is a very rich and useful report on this complex subject, here I will expand on a few specific issues where research in computational ... More

Spin one matter fieldsSep 26 2015Mar 26 2016Spin-one matter fields are relevant both for the description of hadronic states and as potential extensions of the Standard Model. In this work we present a formalism for the description of massive spin-one fields transforming in the $(1,0)\oplus(0,1)$ ... More

The role of the thermal $f_0(500)$ in chiral symmetry restorationNov 18 2018Feb 26 2019We show that the $\sigma/f_0(500)$ state with finite-temperature $T$ corrections to its spectral properties included, plays an essential role for the description of the scalar susceptibility $\chi_S$, signaling chiral symmetry restoration. First, we use ... More

The impacts of congestion on automobile accessibility. What happens in large European cities?Oct 21 2016This paper analyze how congestion impact in accessibility in eight european cities

Representation of dynamic spatial phenomena: The daily car accessibility in LondonOct 20 2016This paper uses traditional maps in animations to show traffic congestion effects in London

The QCD topological charge and its thermal dependence: the role of the $η'$Jul 26 2019We analyze the contribution of the $\eta'(958)$ meson in the first two non-trivial moments of the QCD topological charge distribution, namely, the topological susceptibility and the fourth-order cumulant of the vacuum energy density. We perform our study ... More

Cross-entangling electronic and nuclear spins of distant nitrogen-vacancy centers in noisy environments by means of quantum microwave radiationJul 26 2018Nitrogen-vacancy (NV) defect centers in diamond are strong candidates to generate entangled states in solid-state environments even at room temperature. Quantum correlations in spatially separated NV systems, for distances between NVs ranging from a few ... More

Numerical analysis for a chemotaxis-Navier-Stokes systemAug 09 2019In this paper we develop a numerical scheme for approximating a $d$-dimensional chemotaxis-Navier-Stokes system, $d=2,3$, modeling cellular swimming in incompressible fluids. This model describes the chemotaxis-fluid interaction in cases where the chemical ... More

Detailed photometric analysis of young star groups in the galaxy NGC 300Aug 22 2016The purpose of this work is to understand the global characteristics of the stellar populations in NGC 300. In particular, we focused our attention on searching young star groups and study their hierarchical organization. The research was conducted using ... More

The index of exceptional symmetric spacesMay 15 2019The index of a Riemannian symmetric space is the minimal codimension of a proper totally geodesic submanifold (Onishchik, 1980). There is a conjecture by the first two authors for how to calculate the index. In this paper we give an affirmative answer ... More

A discrete approach to Wirtinger's inequalityMay 14 2019Considering Wirtinger's inequality for piece-wise equipartite functions we find a discrete version of this classical inequality. The main tool we use is the theorem of classification of isometries. Our approach provides a new elementary proof of Wirtinger's ... More

A Transition-based Algorithm for Unrestricted AMR ParsingMay 23 2018Non-projective parsing can be useful to handle cycles and reentrancy in AMR graphs. We explore this idea and introduce a greedy left-to-right non-projective transition-based parser. At each parsing configuration, an oracle decides whether to create a ... More

Comparing Neural- and N-Gram-Based Language Models for Word SegmentationDec 03 2018Word segmentation is the task of inserting or deleting word boundary characters in order to separate character sequences that correspond to words in some language. In this article we propose an approach based on a beam search algorithm and a language ... More

Constituent Parsing as Sequence LabelingOct 21 2018Sep 17 2019We introduce a method to reduce constituent parsing to sequence labeling. For each word w_t, it generates a label that encodes: (1) the number of ancestors in the tree that the words w_t and w_{t+1} have in common, and (2) the nonterminal symbol at the ... More

HEAD-QA: A Healthcare Dataset for Complex ReasoningJun 11 2019We present HEAD-QA, a multi-choice question answering testbed to encourage research on complex reasoning. The questions come from exams to access a specialized position in the Spanish healthcare system, and are challenging even for highly specialized ... More

Harry Potter and the Action Prediction Challenge from Natural LanguageMay 27 2019We explore the challenge of action prediction from textual descriptions of scenes, a testbed to approximate whether text inference can be used to predict upcoming actions. As a case of study, we consider the world of the Harry Potter fantasy novels and ... More

Grounding the Semantics of Part-of-Day Nouns Worldwide using TwitterMay 23 2018The usage of part-of-day nouns, such as 'night', and their time-specific greetings ('good night'), varies across languages and cultures. We show the possibilities that Twitter offers for studying the semantics of these terms and its variability between ... More

Recent advances on chiral partners and patternsNov 30 2017We review recent results on chiral $SU(2)_L\times SU(2)_R\approx O(4)$ and $U(1)_A$ symmetry restoration in QCD. In particular, we discuss how Ward Identities allow one to derive general results on partner degeneration, which shed light on the distinction ... More

Three-body radiative capture reactionsJan 04 2018Radiative capture reaction rates for $^6$He, $^9$Be and $^{17}$Ne formation at astrophysical conditions are studied within a three-body model using the analytical transformed harmonic oscillator method to calculate their states. An alternative procedure ... More

Determining astrophysical three-body radiative capture reaction rates from inclusive Coulomb break-up measurementsApr 21 2016A relationship between the Coulomb inclusive break-up probability and the radiative capture reaction rate for weakly-bound three-body systems is established. This direct link provides a robust procedure to estimate the reaction rate for nuclei of astrophysical ... More

Analysis of ground penetrating radar data from the tunnel beneath the Temple of the Feathered Serpent in Teotihuacan, Mexico, using new multi-cross algorithmsSep 28 2016As multichannel equipment is increasingly used, we developed two algorithms for multivariable wavelet analysis of GPR signals (multi-cross wavelet MCW and Fourier multi-cross function FMC) and applied them to analyze raw GPR traces of archeological subsurface ... More

Quantum Phase Transitions detected by a local probe using Time Correlations and Violations of Leggett-Garg InequalitiesSep 01 2015Jan 22 2016In the present paper we introduce a way of identifying quantum phase transitions of many-body systems by means of local time correlations and Leggett-Garg inequalities. This procedure allows to experimentally determine the quantum critical points not ... More

Compound orbits break-up in constituents: an algorithmFeb 24 2014In this paper decomposition of periodic orbits in bifurcation diagrams are derived in unidimensional dynamics system $x_{n+1}=f(x_{n};r)$, being $f$ an unimodal function. We proof a theorem which states the necessary and sufficient conditions for the ... More

Quantum Hysteresis in Coupled Light-Matter SystemsJun 28 2016Sep 08 2016We investigate the non-equilibrium quantum dynamics of a canonical light-matter system, namely the Dicke model, when the light-matter interaction is ramped up and down through a cycle across the quantum phase transition. Our calculations reveal a rich ... More

Analysis of a chemo-repulsion model with nonlinear production: The continuous problem and unconditionally energy stable fully discrete schemesJul 12 2018Aug 21 2018We consider the following repulsive-productive chemotaxis model: Let $p\in (1,2)$, find $u \geq 0$, the cell density, and $v \geq 0$, the chemical concentration, satisfying \begin{equation}\label{C5:Am} \left\{ \begin{array} [c]{lll} \partial_t u - \Delta ... More

A Characterization of Jacobians by the Existence of Picard BundlesFeb 25 2008Based on the Matsusaka-Ran criterion we give a criterion to characterize when a principal polarized abelian variety is a Jacobian by the existence of Picard bundles.

Extensions of convex functions with prescribed subdifferentialsNov 13 2018Apr 17 2019Let $E$ be an arbitrary subset of a Banach space $X$, $f: E \rightarrow \mathbb{R}$ be a function, and $G:E \rightrightarrows X^*$ be a set-valued mapping. We give necessary and sufficient conditions on $f, G$ for the existence of a continuous convex ... More

Study of a chemo-repulsion model with quadratic production. Part II: Analysis of an unconditional energy-stable fully discrete schemeMar 06 2018This work is devoted to study a fully discrete scheme for a repulsive chemotaxis with quadratic production model. By following the ideas presented in [Guilen-Gonzalez et al], we introduce an auxiliary variable (the gradient of the chemical concentration), ... More

Study of a chemo-repulsion model with quadratic production. Part I: Analysis of the continuous problem and time-discrete numerical schemesMar 06 2018We consider a chemo-repulsion model with quadratic production in bounded domains, which is a nonlinear parabolic system for two variables; the cell density and the chemical concentration. We present two mass-conservative and unconditional energy-stable ... More

Flavored Non-Minimal Left-Right Symmetric Model Fermion Masses and MixingsJul 07 2018Oct 28 2018A complete study on the fermion masses and flavor mixing is presented in a non-minimal left-right symmetric model (NMLRMS) where the ${\bf S}_{3}\otimes {\bf Z}_{2}\otimes {\bf Z}^{e}_{2}$ flavor symmetry drives the Yukawa couplings. In the quark sector, ... More

Viable Dependency Parsing as Sequence LabelingFeb 27 2019We recast dependency parsing as a sequence labeling problem, exploring several encodings of dependency trees as labels. While dependency parsing by means of sequence labeling had been attempted in existing work, results suggested that the technique was ... More

A Full Non-Monotonic Transition System for Unrestricted Non-Projective ParsingJun 11 2017Restricted non-monotonicity has been shown beneficial for the projective arc-eager dependency parser in previous research, as posterior decisions can repair mistakes made in previous states due to the lack of information. In this paper, we propose a novel, ... More

Non-Projective Dependency Parsing with Non-Local TransitionsOct 25 2017May 15 2018We present a novel transition system, based on the Covington non-projective parser, introducing non-local transitions that can directly create arcs involving nodes to the left of the current focus positions. This avoids the need for long sequences of ... More

The scarcity of crossing dependencies: a direct outcome of a specific constraint?Jan 13 2016Crossing syntactic dependencies have been observed to be infrequent in natural language, to the point that some syntactic theories and formalisms disregard them entirely. This leads to the question of whether the scarcity of crossings in languages arises ... More

Faster Shift-Reduce Constituent Parsing with a Non-Binary, Bottom-Up StrategyApr 21 2018We propose a novel non-binary shift-reduce algorithm for constituent parsing. Our parser follows a classical bottom-up strategy but, unlike others, it straightforwardly creates non-binary branchings with just one Reduce transition, instead of requiring ... More

Faster Shift-Reduce Constituent Parsing with a Non-Binary, Bottom-Up StrategyApr 21 2018Jul 31 2019An increasingly wide range of artificial intelligence applications rely on syntactic information to process and extract meaning from natural language text or speech, with constituent trees being one of the most widely used syntactic formalisms. To produce ... More

Anti dependency distance minimization in short sequences. A graph theoretic approachJun 13 2019Dependency distance minimization (DDm) is a word order principle favouring the placement of syntactically related words close to each other in sentences. Massive evidence of the principle has been reported for more than a decade with the help of syntactic ... More

A Dynamic Oracle for Linear-Time 2-Planar Dependency ParsingMay 14 2018May 15 2018We propose an efficient dynamic oracle for training the 2-Planar transition-based parser, a linear-time parser with over 99% coverage on non-projective syntactic corpora. This novel approach outperforms the static training strategy in the vast majority ... More

The scarcity of crossing dependencies: a direct outcome of a specific constraint?Jan 13 2016Nov 14 2017The structure of a sentence can be represented as a network where vertices are words and edges indicate syntactic dependencies. Interestingly, crossing syntactic dependencies have been observed to be infrequent in human languages. This leads to the question ... More

Crossings as a side effect of dependency lengthsAug 26 2015Jul 01 2016The syntactic structure of sentences exhibits a striking regularity: dependencies tend to not cross when drawn above the sentence. We investigate two competing explanations. The traditional hypothesis is that this trend arises from an independent principle ... More

Generic Axiomatization of Families of Noncrossing Graphs in Dependency ParsingJun 11 2017We present a simple encoding for unlabeled noncrossing graphs and show how its latent counterpart helps us to represent several families of directed and undirected graphs used in syntactic and semantic parsing of natural language as context-free languages. ... More

Sequence Labeling Parsing by Learning Across RepresentationsJul 02 2019Aug 31 2019We use parsing as sequence labeling as a common framework to learn across constituency and dependency syntactic abstractions. To do so, we cast the problem as multitask learning (MTL). First, we show that adding a parsing paradigm as an auxiliary loss ... More

Variational description of the ground state of the repulsive two-dimensional Hubbard model in terms of nonorthogonal symmetry-projected Slater determinantsAug 11 2014The few determinant (FED) methodology, introduced in our previous works for 1D lattices, is here adapted for the repulsive two-dimensional Hubbard model at half-filling and with finite doping fractions. Within this configuration mixing scheme, a given ... More

Multi-component symmetry-projected approach for molecular ground state correlationsSep 17 2013The symmetry-projected Hartree--Fock ansatz for the electronic structure problem can efficiently account for static correlation in molecules, yet it is often unable to describe dynamic correlation in a balanced manner. Here, we consider a multi-component, ... More

Measurement of the Optical Turbulence Produced by a Multirotor Unmanned Aerial VehicleJun 04 2019At present, new approaches for the use of Multirotor Unmanned Aerial Vehicle or multirotor drones in high precision optical applications are rising. However, the optical turbulence effects generated by multirotor drones are not entirely understood. These ... More

Entangled microwaves as a resource for entangling spatially separate solid-state qubits: superconducting qubits, NV centers and magnetic moleculesDec 01 2015Jun 13 2016Quantum correlations present in a broadband two-line squeezed microwave state can induce entanglement in a spatially separated bipartite system consisting of either two single qubits or two qubit ensembles. By using an appropriate master equation for ... More

Ab initio study of the influence of nanoscale doping inhomogeneities in the phase separated state of La$_{1-x}$Ca$_{x}$MnO$_3$Jun 07 2012The chemical influence in the phase separation phenomenon that occurs in perovskite manganites is discussed by means of ab initio calculations. Supercells have been used to simulate a phase separated state, that occurs at Ca concentrations close to the ... More

Single spin resonance driven by electric modulation of the g factor anisotropySep 17 2019We address the problem of electronic and nuclear spin resonance of an individual atom on a surface driven by a scanning tunnelling microscope. Several mechanisms have been proposed so far, some of them based on the modulation of exchange and crystal field ... More

Unconditionally energy stable fully discrete schemes for a chemo-repulsion modelJul 03 2018This work is devoted to study unconditionally energy stable and mass-conservative numerical schemes for the following repulsive-productive chemotaxis model: Find $u \geq 0$, the cell density, and $v \geq 0$, the chemical concentration, such that $$ \left\{ ... More

The Simultaneous Strong Metric Dimension of Graph FamiliesApr 19 2015Let ${\cal G}$ be a family of graphs defined on a common (labeled) vertex set $V$. A set $S\subset V$ is said to be a simultaneous strong metric generator for ${\cal G}$ if it is a strong metric generator for every graph of the family. The minimum cardinality ... More

Effective quasiparticle approach for a Cavity-QDots SystemAug 08 2019In this work, we present a quasiparticle strategy to study the Hamiltonian description of the stationary states for two quantum dots--cavity system. We consider three different effective schemes of quasiparticles that give an in-depth insight into the ... More

Asymptotic behaviour for a chemo-repulsion system with quadratic production: The continuous problem and two fully discrete numerical schemesMay 02 2018In this paper we consider a repulsive chemotaxis model with quadratic production term. We analyze the large-time behavior of the global weak-strong solutions and we prove the exponential convergence to a constant state as time goes to infinity. Moreover, ... More

Breaking the sound barrier in AdS/CFTSep 12 2016It has been conjectured that the speed of sound in holographic models with UV fixed points has an upper bound set by the value of the quantity in conformal field theory. If true, this would set stringent constraints for the presence of strongly coupled ... More

Polyradical character and spin frustration in fullerene molecules: An ab initio non-collinear Hartree--Fock studyAug 19 2014Most {\em ab initio} calculations on fullerene molecules have been carried out based on the paradigm of the H\"uckel model. This is consistent with the restricted nature of the independent-particle model underlying such calculations, even in single-reference-based ... More

Excited electronic states from a variational approach based on symmetry-projected Hartree--Fock configurationsSep 24 2013Recent work from our research group has demonstrated that symmetry-projected Hartree--Fock (HF) methods provide a compact representation of molecular ground state wavefunctions based on a superposition of non-orthogonal Slater determinants. The symmetry-projected ... More

Improving Coverage and Runtime Complexity for Exact Inference in Non-Projective Transition-Based Dependency ParsersApr 27 2018May 02 2018We generalize Cohen, G\'omez-Rodr\'iguez, and Satta's (2011) parser to a family of non-projective transition-based dependency parsers allowing polynomial-time exact inference. This includes novel parsers with better coverage than Cohen et al. (2011), ... More

Global Transition-based Non-projective Dependency ParsingJul 04 2018Shi, Huang, and Lee (2017) obtained state-of-the-art results for English and Chinese dependency parsing by combining dynamic-programming implementations of transition-based dependency parsers with a minimal set of bidirectional LSTM features. However, ... More

World Space Observatory-Ultraviolet: ISSIS, the imaging instrumentFeb 05 2013Jun 04 2013The Imaging and Slitless Spectroscopy Instrument (ISSIS) will be flown as part of the Science Instrumentation in the World Space Observatory-Ultraviolet (WSO-UV). ISSIS will be the first UV imager to operate in a high Earth orbit from a 2-m class space ... More

A catalog of 44 GHz methanol masers in massive star-forming regions. IV. The high-mass protostellar object sampleSep 28 2017We present a survey of 56 massive star-forming regions in the 44 GHz methanol maser transition made with the Karl G. Jansky Very Large Array (VLA); 24 of the 56 fields showed maser emission. The data allow us to demonstrate associations, at arcsecond ... More

Interferometric and single-dish observations of 44, 84 and 95 GHz Class I methanol masersDec 09 2017We present observations of massive star-forming regions selected from the IRAS Point Source Catalog. The observations were made with the Very Large Array and the Large Millimeter Telescope to search for Class I methanol masers. We made interferometric ... More

ALMA Reveals A Collision Between Protostellar Outflows in BHR71Apr 02 2018Apr 03 2018For a binary protostellar outflow system in which its members are located so close to each other (the separation being smaller than the addition of the widths of the flows) and with large opening angles, the collision seems unavoidable regardless of the ... More

Software System Design based on Patterns for Newton-Type MethodsMay 12 2019A wide range of engineering applications uses optimisation techniques as part of their solution process. The researcher uses specialized software that implements well-known optimisation techniques to solve his problem. However, when it comes to develop ... More

Unveiling the Penta-Silicene nature of perfectly aligned single and double strand Si-nanoribbons on Ag(110)Apr 29 2016We reveal through extensive DFT calculations, confronted to key experimental facts, the hidden penta-silicene nature of single and double strand chiral Si nanoribbons perfectly aligned on Ag(110) surfaces, that were discovered in 2005, but whose structure ... More

The Highly Collimated Radio Jet of HH 80-81: Structure and Non-Thermal EmissionNov 06 2017Radio emission from protostellar jets is usually dominated by free-free emission from thermal electrons. However, in some cases, it has been proposed that non-thermal emission could also be present. This additional contribution from non-thermal emission ... More

Experimental implementation of an eight-dimensional Kochen-Specker set and observation of its connection with the Greenberger-Horne-Zeilinger theoremAug 29 2013Aug 04 2014For eight-dimensional quantum systems there is a Kochen-Specker (KS) set of 40 quantum yes-no tests that is related to the Greenberger-Horne-Zeilinger (GHZ) proof of Bell's theorem. Here we experimentally implement this KS set using an eight-dimensional ... More

Moduli Spaces of Semistable Sheaves on Singular Genus One CurvesJun 12 2008Jun 03 2009We find some equivalences of the derived category of coherent sheaves on a Gorenstein genus one curve that preserve the (semi)-stability of pure dimensional sheaves. Using them we establish new identifications between certain Simpson moduli spaces of ... More

Universal, Unsupervised (Rule-Based), Uncovered Sentiment AnalysisJun 17 2016Jan 05 2017We present a novel unsupervised approach for multilingual sentiment analysis driven by compositional syntax-based rules. On the one hand, we exploit some of the main advantages of unsupervised algorithms: (1) the interpretability of their output, in contrast ... More

Limits on the performance of Infotaxis under inaccurate modelling of the environmentAug 06 2014We study the performance of infotaxis search strategy measured by the rate of success and mean search time, under changes in the environment parameters such as diffusivity, rate of emission or wind velocity. We also investigate the drop of performance ... More

Universal, Unsupervised, Uncovered Sentiment AnalysisJun 17 2016We present a novel unsupervised approach for multilingual sentiment analysis driven by compositional syntax-based rules. On the one hand, we exploit some of the main advantages of unsupervised algorithms: (1) the interpretability of their output, in contrast ... More

Elimination of Spurious Ambiguity in Transition-Based Dependency ParsingJun 28 2012We present a novel technique to remove spurious ambiguity from transition systems for dependency parsing. Our technique chooses a canonical sequence of transition operations (computation) for a given dependency tree. Our technique can be applied to a ... More

Properties of HI discs in the Auriga cosmological simulationsOct 05 2016Jan 19 2017We analyse the properties of the HI gas distribution in the Auriga project, a set of magnetohydrodynamic cosmological simulations performed with the moving-mesh code AREPO and a physics model for galaxy formation that succeeds in forming realistic late-type ... More

How Important is Syntactic Parsing Accuracy? An Empirical Evaluation on Rule-Based Sentiment AnalysisJun 07 2017Oct 24 2017Syntactic parsing, the process of obtaining the internal structure of sentences in natural languages, is a crucial task for artificial intelligence applications that need to extract meaning from natural language text or speech. Sentiment analysis is one ... More

A dependency look at the reality of constituencyAug 24 2017Mar 16 2018A comment on "Neurophysiological dynamics of phrase-structure building during sentence processing" by Nelson et al (2017), Proceedings of the National Academy of Sciences USA 114(18), E3669-E3678.

One model, two languages: training bilingual parsers with harmonized treebanksJul 30 2015May 19 2016We introduce an approach to train lexicalized parsers using bilingual corpora obtained by merging harmonized treebanks of different languages, producing parsers that can analyze sentences in either of the learned languages, or even sentences that mix ... More

Unsupervised Understanding of Location and Illumination Changes in Egocentric VideosMar 30 2016Mar 27 2017Wearable cameras stand out as one of the most promising devices for the upcoming years, and as a consequence, the demand of computer algorithms to automatically understand the videos recorded with them is increasing quickly. An automatic understanding ... More

Multi-reference symmetry-projected variational approaches for ground and excited states of the one-dimensional Hubbard modelApr 15 2013Jun 12 2013We present a multi-reference configuration mixing scheme for describing ground and excited states, with well defined spin and space group symmetry quantum numbers, of the one-dimensional Hubbard model with nearest-neighbor hopping and periodic boundary ... More

VHE Emission from Magnetic Reconnection in the RIAF of SgrA*Apr 11 2019May 23 2019The cosmic-ray (CR) accelerator at the galactic centre (GC) is not yet established by current observations. Here we investigate the radiative-inefficient accretion flow (RIAF) of Sagittarius A* (SgrA*) as a CR accelerator assuming acceleration by turbulent ... More

Symmetry-projected Wave Functions in Quantum Monte Carlo CalculationsJan 31 2014We consider symmetry-projected Hartree--Fock trial wave functions in constrained-path Monte Carlo (CPMC) calculations. Previous CPMC calculations have mostly employed Hartree--Fock (HF) trial wave functions, restricted or unrestricted. The symmetry-projected ... More

Numerical models of neutrino and gamma-ray emission from magnetic reconnection in the core of radio-galaxiesMar 12 2019Non-blazar radio-galaxies emitting in the very-high-energy (VHE; >100 GeV) regime offer a unique perspective for probing particle acceleration and emission processes in black hole (BH) accretion-jet systems. The misaligned nature of these sources indicates ... More

Numerical solution for an aggregation equation with degenerate diffusionMar 27 2018Sep 02 2019A numerical method for approximating weak solutions of an aggregation equation with degenerate diffusion is introduced. The numerical method consists of a stabilized finite element method together with a mass lumping technique and an extra stabilizing ... More