cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On a non-local spectrogram for denoising one-dimensional signals
Creators: name: Galiano, Gonzalo
name: Velasco, Julián
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In previous works, we investigated the use of local filters based on partial differential equations (PDE) to denoise one-dimensional signals through the image processing of time-frequency representations, such as the spectrogram. In this image denoising algorithms, the particularity of the image was hardly taken into account. We turn, in this paper, to study the performance of non-local filters, like Neighborhood or Yaroslavsky filters, in the same problem. We show that, for certain iterative schemes involving the Neighborhood filter, the computational time is drastically reduced with respect to Yaroslavsky or nonlinear PDE based filters, while the outputs of the filtering processes are similar. This is heuristically justified by the connection between the (fast) Neighborhood filter applied to a spectrogram and the corresponding Nonlocal Means filter (accurate) applied to the Wigner-Ville distribution of the signal. This correspondence holds only for time-frequency representations of one-dimensional signals, not to usual images, and in this sense the particularity of the image is exploited. We compare though a series of experiments on synthetic and biomedical signals the performance of local and non-local filters.
description: 13 pages
07-09-2021 Mutualismo y simbiosis
Creators: name: Conde Cuautle, Carolina
Publisher: name: Zenodo
Year: 2021
Subjects: Simbiosis; mutualismo; rizobias; rizósfera; nódulos

description: RESUMEN Los microorganismos de un ecosistema van a presentar distintos tipos de asociaciones que pueden ser favorables para ellos, tenemos el caso del mutualismos que es la vida en común de dos o más organismos asociados que proporcionan un beneficio mutuo entre ellos y no necesariamente existe un contacto físico, al contrario de la simbiosis, que es una asociación específica entre dos tipos de organismos en contacto físico [1]. Las relaciones simbióticas mejoran la productividad y la diversidad de las plantas, ya que pueden actuar de forma sinérgica (los efectos debidos a la interacción aumentan en comparación con la adición de efectos individuales). Los simbiontes que interactúan pueden estimular el funcionamiento del ecosistema proporcionando diferentes servicios (por ejemplo, nutrientes limitantes complementarios) a las plantas y apoyando a diferentes especies de plantas [2]. La simbiosis entre las rizobacterias del suelo y las leguminosas es facultativa e iniciada por la falta de nitrógeno de la planta huésped. En este caso sucede un intercambio de moléculas que conduce a la formación de nódulos en los cuales las bacterias se van a convertir en bacteroides fijadores de nitrógeno, proporcionando una fuente de nitrógeno para el crecimiento de la planta [3].
description: {"references": ["Carrillo L.. (2003). 2. Vida y muerte de los microorganismos. En Microbiolog\u00eda Agr\u00edcola(74- 78). Universidad Nacional de Salta: ISBN:987-9381-16-5.", "Van Der Heijden, M. G., De Bruin, S., Luckerhoff, L., Van Logtestijn, R. S., & Schlaeppi, K. (2016). A widespread plant-fungal-bacterial symbiosis promotes plant biodiversity, plant nutrition and seedling recruitment. The ISME journal, 10(2), 389-399", "Mar\u00f3ti, G., & Kondorosi, E. (2014). Nitrogen-fixing Rhizobium-legume symbiosis: are polyploidy and host peptide-governed symbiont differentiation general principles of endosymbiosis?. Frontiers in microbiology, 5, 326. https://doi.org/10.3389/fmicb.2014.00326"]}
Global structure of static spherically symmetric solutions surrounded by quintessence
Creators: name: Cruz, Miguel
name: Ganguly, Apratim
name: Gannouji, Radouane
name: Leon, Genly
name: Saridakis, Emmanuel N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate all static spherically symmetric solutions in the context of general relativity surrounded by a minimally-coupled quintessence field, using dynamical system analysis. Applying the 1+1+2 formalism and introducing suitable normalized variables involving the Gaussian curvature, we were able to reformulate the field equations as first order differential equations. In the case of a massless canonical scalar field we recovered all known black hole results, such as the Fisher solution, and we found that apart from the Schwarzschild solution all other solutions are naked singularities. Additionally, we identified the symmetric phase space which corresponds to the white hole part of the solution and in the case of a phantom field, we were able to extract the conditions for the existence of wormholes and define all possible class of solutions such as Cold Black holes, singular spacetimes and wormholes like Ellis wormhole, for example. For an exponential potential, we found that the black hole solution which is asymptotically flat is unique and it is the Schwarzschild spacetime, while all other solutions are naked singularities. Furthermore, we found solutions connecting to a white hole through a maximum radius, and not a minimum radius (throat) such as wormhole solutions, therefore violating the flare-out condition. Finally, we have found a necessary and sufficient condition on the form of the potential to have an asymptotically AdS spacetime along with a necessary condition for the existence of asymptotically flat black holes.
description: 37 pages, 5 figures; Accepted for publication in Class. Quantum Grav
Composite Weyl nodes stabilized by screw symmetry with and without time reversal
Creators: name: Tsirkin, Stepan S.
name: Souza, Ivo
name: Vanderbilt, David
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We classify the band degeneracies in 3D crystals with screw symmetry $n_m$ and broken $\mathcal P*\mathcal T$ symmetry, where $\mathcal P$ stands for spatial inversion and $\mathcal T$ for time reversal. The generic degeneracies along symmetry lines are Weyl nodes: Chiral contact points between pairs of bands. They can be single nodes with a chiral charge of magnitude $|χ|=1$ or composite nodes with $|χ|=2$ or $3$, and the possible $χ$ values only depend on the order $n$ of the axis, not on the pitch $m/n$ of the screw. Double Weyl nodes require $n=4$ or 6, and triple nodes require $n=6$. In all cases the bands split linearly along the axis, and for composite nodes the splitting is quadratic on the orthogonal plane. This is true for triple as well as double nodes, due to the presence in the effective two-band Hamiltonian of a nonchiral quadratic term that masks the chiral cubic dispersion. If $\mathcal T$ symmetry is present and $\mathcal P$ is broken there may exist on some symmetry lines Weyl nodes pinned to $\mathcal T$-invariant momenta, which in some cases are unavoidable. In the absence of other symmetries their classification depends on $n$, $m$, and the type of $\mathcal T$ symmetry. With spinless $\mathcal T$ such $\mathcal T$-invariant Weyl nodes are always double nodes, while with spinful $\mathcal T$ they can be single or triple nodes. $\mathcal T$-invariant triples nodes can occur not only on 6-fold axes but also on 3-fold ones, and their in-plane band splitting is cubic, not quadratic as in the case of generic triple nodes. These rules are illustrated by means of first-principles calculations for hcp cobalt, a $\mathcal T$-broken, $\mathcal P$-invariant crystal with $6_3$ symmetry, and for trigonal tellurium and hexagonal NbSi$_2$, which are $\mathcal T$-invariant, $\mathcal P$-broken crystals with 3-fold and 6-fold screw symmetry respectively.
On a cross-diffusion segregation problem arising from a model of interacting particles
Creators: name: Galiano, Gonzalo
name: Selgas, Virginia
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35K55, 35D30, 92D25

description: We prove the existence of solutions of a cross-diffusion parabolic population problem. The system of partial differential equations is deduced as the limit equations satisfied by the densities corresponding to an interacting particles system modeled by stochastic differential equations. According to the values of the diffusion parameters related to the intra and inter-population repulsion intensities, the system may be classified in terms of an associated matrix. For proving the existence of solutions when the matrix is positive definite, we use a fully discrete finite element approximation in a general functional setting. If the matrix is only positive semi-definite, we use a regularization technique based on a related cross-diffusion model under more restrictive functional assumptions. We provide some numerical experiments demonstrating the weak and strong segregation effects corresponding to both types of matrices.
description: 24 pages
HuertasLeyva_2022_CIECA_TrainingMC.pdf
Creators: name: Huertas-Leyva, Pedro
name: Baldanzini, Niccolò
name: Pierini, Marco
Publisher: name: figshare
Year: 2022
Subjects: subject: 90507 Transport Engineering
subject: FOS: Civil engineering
subject: 91304 Dynamics, Vibration and Vibration Control
subject: FOS: Mechanical engineering
subject: 90204 Automotive Safety Engineering
subject: 130309 Learning Sciences
subject: FOS: Educational sciences

description: The objectives of this study are twofold: to collect the preferences and requirements of a sample of instructors to teach the most frequent emergency manoeuvre; (ii) to develop a method by reproducing a real emergency braking scenario with perception-action components capable of identifying with data from an instrumented vehicle the difference between the use of brakes by experts versus less skilled riders. In a first stage, 19 instructors from different regions of Italy were consulted with surveys to understand the braking training procedure and the instructor preferences. In a second stage, a field experiment was conducted in a real-world controlled environment to identify the differences among 13 riders with different skill levels in an emergency scenario. As a demonstrator, a user interface tool was designed that classifies the skill level of the rider and provides prescriptive feedback to support learning process.
Localization and diffusion of tracer particles in viscoelastic media with active force dipoles
Creators: name: Yasuda, Kento
name: Okamoto, Ryuichi
name: Komura, Shigeyuki
name: Mikhailov, Alexander S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Optical tracking in vivo experiments reveal that diffusion of particles in biological cells is strongly enhanced in the presence of ATP and the experimental data for animal cells could previously be reproduced within a phenomenological model of a gel with myosin motors acting within it [EPL 110, 48005 (2015)]. Here, the two-fluid model of a gel is considered where active macromolecules, described as force dipoles, cyclically operate both in the elastic and the fluid components. Through coarse-graining, effective equations of motions for tracer particles displaying local deformations and local fluid flows are derived. The equation for deformation tracers coincides with the earlier phenomenological model and thus confirms it. For flow tracers, diffusion enhancement caused by active force dipoles in the fluid component, and thus due to metabolic activity, is found. The latter effect may explain why ATP-dependent diffusion enhancement could also be observed in bacteria that lack molecular motors in their skeleton or when the activity of myosin motors was chemically inhibited.
Michaelis-Menten at 100 and allosterism at 50: driving molecular motors in a hailstorm with noisy ATPase engines and allosteric transmission
Creators: name: Chowdhury, Debashish
Publisher: name: arXiv
Year: 2017
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Cytoskeletal motor proteins move on filamentous tracks by converting input chemical energy that they derive by catalyzing the hydrolysis of ATP. The ATPase site is the analog of an engine and hydrolysis of ATP is the analog of burning of chemical fuel. Moreover, the functional role of a segment of the motor is analogous to that of the transmission system of an automobile that consists of shaft, gear, clutch, etc. The operation of the engine is intrinsically "noisy" and the motor faces a molecular "hailstorm" in the aqueous medium. In this commemorative article, we celebrate the centenary of Michaelis and Menten's landmark paper of 1913 and the golden jubilee of Monod et al.'s classic paper of 1963 by highlighting their relevance in explaining the operational mechanisms of the engine and the transmission system, respectively, of cytoskeletal motors.
description: This is an author-created, un-copyedited version of an article published in FEBS Journal (Federation of European Biochem. Soc.)
On a fast bilateral filtering formulation using functional rearrangements
Creators: name: Galiano, Gonzalo
name: Velasco, Julián
Publisher: name: arXiv
Year: 2015
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences
subject: 68U10

description: We introduce an exact reformulation of a broad class of neighborhood filters, among which the bilateral filters, in terms of two functional rearrangements: the decreasing and the relative rearrangements.
 Independently of the image spatial dimension (one-dimensional signal, image, volume of images, etc.), we reformulate these filters as integral operators defined in a one-dimensional space corresponding to the level sets measures.
 We prove the equivalence between the usual pixel-based version and the rearranged version of the filter. When restricted to the discrete setting, our reformulation of bilateral filters extends previous results for the so-called fast bilateral filtering. We, in addition, prove that the solution of the discrete setting, understood as constant-wise interpolators, converges to the solution of the continuous setting.
 Finally, we numerically illustrate computational aspects concerning quality approximation and execution time provided by the rearranged formulation.
description: 29 pages, Journal of Mathematical Imaging and Vision, 2015. arXiv admin note: substantial text overlap with arXiv:1406.7128
24-09-2021 Clonación de moléculas de DNA
Creators: name: Conde Cuautle, Carolina
Publisher: name: Zenodo
Year: 2021
Subjects: Clonación; gen de interés; DNA recombinante; vector de clonación; transformación

description: RESUMEN En la clonación se puede generar un número elevado de copias de un fragmento de DNA de interés o un gen, así como cDNA. Para lograr este proceso se requiere de un DNA de partida, así como un vector de clonación, que bien puede ser un plásmido, bacteriófago, cósmido, por mencionar algunos ejemplos. Una vez obtenido nuestro DNA a clonarse, también denominado inserto, se unirá a un vector de clonación, obteniendo así, el DNA recombinante (rDNA), que posteriormente será incorporado a una célula anfitriona que puede ser tanto eucariota, procariota o de origen animal, cuya elección será en función de nuestras necesidades. El proceso de incorporación del rDNA a nuestra bacteria se denomina “transformación de las bacterias” y puede ocurrir mediante diversos métodos; tratamientos físico-químicos, microinyección, lipofección, electroporación, entre algunos más. Posteriormente el vector se va a replicar al dividirse de forma autónoma la bacteria, provocando así un incremento en el número de copias y aquellas bacterias que llegaron a incorporar de forma correcta el rDNA, darán paso a clones. Finamente y de forma simultánea sucederá la propagación celular y selección de las células de interés, que serán aquellas con los clones recombinantes y en algunos casos se llega a la expresión del DNA clonado para diversas aplicaciones [1].
description: {"references": ["Herr\u00e1ez, \u00c1. (2012). Cap\u00edtulo 15. Clonaci\u00f3n celular: tecnolog\u00eda del DNA recombinante. En Texto ilustrado e interactivo de Biolog\u00eda molecular e ingenier\u00eda gen\u00e9tica 2a edici\u00f3n. Conceptos, t\u00e9cnicas y aplicaciones en ciencias de la salud. (219-236). Barcelona, Espa\u00f1a.: ELSEVIER."]}
Nonparametric estimation of simplified vine copula models: comparison of methods
Creators: name: Nagler, Thomas
name: Schellhase, Christian
name: Czado, Claudia
Publisher: name: arXiv
Year: 2017
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: In the last decade, simplified vine copula models have been an active area of research. They build a high dimensional probability density from the product of marginals densities and bivariate copula densities. Besides parametric models, several approaches to nonparametric estimation of vine copulas have been proposed. In this article, we extend these approaches and compare them in an extensive simulation study and a real data application. We identify several factors driving the relative performance of the estimators. The most important one is the strength of dependence. No method was found to be uniformly better than all others. Overall, the kernel estimators performed best, but do worse than penalized B-spline estimators when there is weak dependence and no tail dependence.
Measurement of the absolute Crab flux with NuSTAR
Creators: name: Madsen, Kristin K.
name: and, Karl Forster
name: Grefenstette, Brian W.
name: Harrison, Fiona A.
name: Stern, Daniel
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present results from a NuSTAR observation of the Crab made at a large off-axis angle of 1.5\degree. At these angles X-rays do not pass through the optics, but rather illuminate the detectors directly due to incomplete baffling. Due to the simplicity of the instrument response in this configuration and the good absolute calibration of the detectors, we are able to measure the absolute intrinsic flux of the Crab to better than 4%. We find the spectral parameters of the powerlaw to be Gamma=2.106 +/- 0.006, N=9.71 +/-0.16, in agreement with the values measured 42 years ago by Toor & Seward (1974). This suggests that the observed variability of the Crab is not part of a long term trend, but instead results from fluctuations around a steady mean. The NuSTAR observation also enabled improved measurement of the detector absorption parameters without the added complications of the mirror response.
description: 6 pages, 3 figures, accepted in ApJ
Anti-Evaporation of Bardeen de-Sitter Black Holes
Creators: name: Singh, Dharm Veer
name: Singh, Naveen K.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In this paper, we discuss the possibility of the anti-evaporation of degenerate Bardeen de-Sitter black hole. We solve the perturbation equations around the Nariai space-time. The solution of one of the perturbations related to the horizon size demonstrates that horizon of such black hole is constant. The other perturbation is also found to be stable. We further study thermodynamical properties of such black holes. We observe double phase transition at the Nariai limit.
description: Extensively revised
Well-posedness of a nonlinear integro-differential problem and its rearranged formulation
Creators: name: Galiano, Gonzalo
name: Schiavi, Emanuele
name: Velasco, Julián
Publisher: name: arXiv
Year: 2015
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We study the existence and uniqueness of solutions of a nonlinear integro-differential problem which we reformulate introducing the notion of the decreasing rearrangement of the solution. A dimensional reduction of the problem is obtained and a detailed analysis of the properties of the solutions of the model is provided. Finally, a fast numerical method is devised and implemented to show the performance of the model when typical image processing tasks such as filtering and segmentation are performed.
description: Final version. To appear in Nolinear Analysis Real World Applications (2016)
01-12-2021 Importancia de la selección de sementales para la reproducción animal
Creators: name: Pérez Zepeda, José Javier
name: Rosas Cervantes, Daniela
name: Santos Hernández, Jaqueline
Publisher: name: Zenodo
Year: 2021
Subjects: semen; espermatozoides; bovinos; electro eyaculador; semental

description: RESUMEN La selección de un buen semental es de suma importancia para el éxito de una producción bovina, para esto se hace uso de técnicas que evalúan las características cualitativas y cuantitativas [1]. La observación de las características anatómicas es la técnica más utilizada, algunas regiones corporales pueden dar indicios de la producción de testosterona del macho en los valores genéticos la herramienta más utilizada son los EPD´S que nos indicara la diferencia en cuanto a características productivas que pueden esperarse de los hijos de un par de toros que se deseen comparar y compartan un ambiente similar [2]. Los espermas de los bovinos deben presentar una buena motilidad y viabilidad, para corroborar que cumplen con los criterios necesarios y poder realizar una inseminación artificial exitosa. La inseminación artificial se refiere al conjunto de técnicas aplicadas con el fin de conseguir la fecundación de la hembra sin la ocurrencia el macho [3]. El semen es obtenido mediante diferentes técnicas, por ejemplo, el electro eyaculador y vagina artificial, al obtener la muestra es analizado en “Pruebas de funcionalidad Espermática” que nos informaran si es un semen de calidad y fértil [4]. Si hay malos procesos de selección el daño se verá reflejado económicamente, pero si se toman en cuenta todas las características de un semental, las ganancias se harán presentes [3].
description: {"references": ["Barros M, Pegorer M, Morales J, et al (2006). Importance of sperm genotype (indicus versus taurus) for fertility and embryonic development at elevated temperatures. Theriogenology, Volumen 65, Pag; 210-218.", "Ortega C. Sau N. (1990). La importancia del semental y de la producci\u00f3n y evaluaci\u00f3n de toretes. 28 octubre 2021, de Patronato del centro de investigaciones pecuarias del estado de Sonora A.C Sitio web: https://www.patrocipes.org.mx/publicaciones/genetica/G90002.html", "Duarte C. (2008). Efecto de la aplicaci\u00f3n de oxitocina sobre la calidad seminal en bovinos en el tr\u00f3pico h\u00famedo. Tesis Licenciatura. FMVZ, Universidad Veracruzana. Veracruz, Ver., M\u00e9x. p. 2", "Angelino J. (2009). Manual de evaluaci\u00f3n de semen en bovinos. Trabajo Pr\u00e1ctico Educativo. FMVZ, Universidad Veracruzana. Veracruz, Ver., M\u00e9x. pp. 30-37"]}
Constraints on the Lyman continuum escape fraction for faint star forming galaxies
Creators: name: Japelj, J.
name: Vanzella, E.
name: Fontanot, F.
name: Cristiani, S.
name: Caminha, G. B.
name: Tozzi, P.
name: Balestra, I.
name: Rosati, P.
name: Meneghetti, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Star forming galaxies have long been considered the dominant sources of the cosmic ultraviolet background radiation at early epochs. However, observing and characterizing the galaxy population with significant ionizing emission has proven to be challenging. In particular, the fraction of ionizing radiation that escapes the local environment to the intergalactic medium is poorly known. We investigate the relation between the escape fraction and galaxy luminosity. We combine the deep ultraviolet observations of Hubble Ultra Deep Field (UVUDF) with the deep Multi Unit Spectroscopic Explorer (MUSE) observations of the same field, collecting a sample of 165 faint star forming galaxies in the $3 < z < 4$ redshift range with deep rest-frame observations of the Lyman continuum. In our sample, we do not find any galaxy with significant emission of LyC radiation. We bin the galaxies in various redshift and brightness intervals and stack their images. From stacked images we estimate the relative escape fraction upper limits as a function of the luminosity. Thanks to the depth of the sample we measure meaningful 1$σ$ upper limits of $f_{esc,rel} < 0.07, 0.2$ and 0.6 at $L \sim L_{\rm z=3}^{*}, 0.5L_{\rm z=3}^{*}$ and $0.1L_{\rm z=3}^{*}$, respectively. We use our estimates and theoretical predictions from the literature to study a possible dependence of the escape fraction on galaxy luminosity by modelling the ionizing background with different prescriptions of $f_{\rm esc} (M_{\rm UV})$. We show that the understanding of the luminosity dependence hinges on the ability to constrain the escape fraction down to $M_{\rm UV} \sim -18$ mag in the future.
description: 16 pages, 15 figures, minor changes with respect to the previous version, accepted to MNRAS
20-05-2022 Sincronización de ovulación en bovinos
Creators: name: Contreras Márquez, Michel
name: Espinosa Fernández de Lara, Angela
name: Saldivar Rosales, Daniela
Publisher: name: Zenodo
Year: 2022
Subjects: ovulación; ciclo estral; bovinos; sincronización del estro; vacas

description: RESUMEN La sincronización de la ovulación es una técnica implementada mediante la aplicación de una o varias hormonas implicadas en la ovulación. Este procedimiento se puede definir como control o manipulación del ciclo estral que tiene objetivo de que la mayoría o la totalidad de las hembras de un hato se presente el estro [1]. El ciclo estral se puede dividir en fase folicular comprendida por el proestro, estro y metaestro, mientras que la fase luteal está formada por el diestro [2]. Las vacas que se encuentran en un sistema intensivo o en estabulación completa, presentan signos que se consideran característicos y también son conocidos como primarios los cuales se manifiestan al inicio del estro, sin embargo, los signos secundarios son variables pero se pueden identificar principalmente al existir una disminución en la producción láctea, el consumo de alimento disminuye y las vacas empiezan a lamerse o recargar la barbilla en la espalda de otras integrantes del hato [3]. Existen dos principales métodos de sincronización los cuales consisten en seguir protocolos con prostágenos como el bloqueo a través de la administración de MGA, implante subcutáneo de Norgestomet y dispositivos intravaginales. Otros protocolos son la utilización de prostaglandinas F2α con dos métodos de aplicación, el primero es administrar una doble dosis de prostaglandinas F2α con inseminación posterior a las aplicaciones, el segundo método es una aplicación única de prostaglandinas después de un periodo de observación de celos [2]. La implementación correcta de sincronización de estros genera grandes beneficios al productor, por ejemplo, permite tener un mejor control en la comercialización de terneros, disminuye el periodo de parición, existe una gestión óptima del alimento para las diferentes categorías de los animales dentro de la producción, además de la realización de inseminación artificial a un mayor número de hembras en un periodo determinado [4].
description: {"references": ["Producci\u00f3n animal. [Internet]. [Consultado 17 Febrero de 2022]. Disponible en: http://www7.uc.cl/sw_educ/prodanim/caracter/fi9.htm", "Gu\u00e1queta H. Ciclo estral: fisiolog\u00eda b\u00e1sica y estrategias para mejorar la detecci\u00f3n de celos. Rev, Med. Ver. Zoot. 2009. 56:163-183. https://www.redalyc.org/pdf/4076/407639221003.pdf", "Guastavino E. Detecci\u00f3n de Celos en Bovino. En Gerencia Comercial FASCO AP, editor. p. 1-3. https://www.adiveter.com/ftp_public/A1607.pdf", "Becaluba Facundo. M\u00e9todos de sincronizaci\u00f3n de celos en bovinos. 2006. https://www.academia.edu/19020473/Mtodos_de_sincronizacin_de_celos_en_bovinos"]}
Analysis of a splitting-differentiation population model leading to cross-diffusion
Creators: name: Galiano, Gonzalo
name: Selgas, Virginia
Publisher: name: arXiv
Year: 2015
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35K55, 65M30, 92D25

description: Starting from the dynamical system model capturing the splitting-differentiation process of populations, we extend this notion to show how the speciation mechanism from a single species leads to the consideration of several well known evolution cross-diffusion partial differential equations.
 Among the different alternatives for the diffusion terms, we study the model introduced by Busenberg and Travis, for which we prove the existence of solutions in the one-dimensional spatial case. Using a direct parabolic regularization technique, we show that the problem is well posed in the space of bounded variation functions, and demonstrate with a simple example that this is the best regularity expected for solutions.
 We numerically compare our approach to other alternative regularizations previously introduced in the literature, for the particular case of the contact inhibition problem. Simulation experiments indicate that the numerical scheme arising from the approximation introduced in this article outperforms those of the existent models from the stability point of view.
Supplementary Material
Creators: name: Engman, Viktor
name: Critchlow, Annabel Jane
name: Laakkonen, Eija
name: Hansen, Mette
name: Mason, Shaun
name: Lamon, Severine
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 329999
subject: Other biomedical and clinical sciences not elsewhere classified

description: Supplementary material to the manuscript "The Role and Regulation of Intramuscular Sex Hormones in Skeletal Muscle: A Systematic Review"
Galois groups over rational function fields and explicit Hilbert irreducibility
Creators: name: Krumm, David
name: Sutherland, Nicole
Publisher: name: arXiv
Year: 2017
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Let $P\in\mathbb Q[t,x]$ be a polynomial in two variables with rational coefficients, and let $G$ be the Galois group of $P$ over the field $\mathbb Q(t)$. It follows from Hilbert's Irreducibility Theorem that for most rational numbers $c$ the specialized polynomial $P(c,x)$ has Galois group isomorphic to $G$ and factors in the same way as $P$. In this paper we discuss methods for computing the group $G$ and obtaining an explicit description of the exceptional numbers $c$, i.e., those for which $P(c,x)$ has Galois group different from $G$ or factors differently from $P$. To illustrate the methods we determine the exceptional specializations of three sample polynomials. In addition, we apply our techniques to prove a new result in arithmetic dynamics.
description: arXiv admin note: text overlap with arXiv:1610.03528
Carroll Limit of Non-BPS Dp-Brane
Creators: name: Kluson, J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We find Carroll non-BPS Dp-brane action by performing Carroll limit of a canonical form of unstable Dp-brane action. We analyze different Carroll limits and discuss solutions of the equations of motion of Carroll non-BPS Dp-brane at the tachyon vacuum.
description: 17 pages, v2;references added,v3; replaced with published version in JHEP
Some Rigidity Theorem for Anosov Geodesic Flows
Creators: name: Dowell, Ítalo
name: Romaña, Sergio
Publisher: name: arXiv
Year: 2017
Subjects: subject: Dynamical Systems (math.DS)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 37C10, 53C24

description: In this paper, we prove that if the geodesic flow of a complete manifold without conjugate points with sectional curvatures bounded below by $-c^2$ is of Anosov type, then the constant of contraction of the flow is $\geq e^{-c}$. Moreover, if $M$ has finite volume, the equality holds if and only if the sectional curvature is constant. We also apply this result to get a certain rigidity bi-Lipschitz conjugation, and consequently, for $C^1$-conjugacy between two geodesic flows.
description: Accepted
Integrated Modeling of Second Phase Precipitation in Cold-Worked 316 Stainless Steels under Irradiation
Creators: name: Mamivand, Mahmood
name: Yang, Ying
name: Busby, Jeremy
name: Morgan, Dane
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The current work combines the Cluster Dynamics (CD) technique and CALPHAD-based precipitation modeling to address the second phase precipitation in cold-worked (CW) 316 stainless steels (SS) under irradiation at 300-400 C. CD provides the radiation enhanced diffusion and dislocation evolution as inputs for the precipitation model. The CALPHAD-based precipitation model treats the nucleation, growth and coarsening of precipitation processes based on classical nucleation theory and evolution equations, and simulates the composition, size and size distribution of precipitate phases. We benchmark the model against available experimental data at fast reactor conditions (9.4 x 10^-7 dpa/s and 390 C) and then use the model to predict the phase instability of CW 316 SS under light water reactor (LWR) extended life conditions (7 x 10^-8 dpa/s and 275 C). The model accurately predicts the gamma-prime (Ni3Si) precipitation evolution under fast reactor conditions and that the formation of this phase is dominated by radiation enhanced segregation. The model also predicts a carbide volume fraction that agrees well with available experimental data from a PWR reactor but is much higher than the volume fraction observed in fast reactors. We propose that radiation enhanced dissolution and/or carbon depletion at sinks that occurs at high flux could be the main sources of this inconsistency. The integrated model predicts ~1.2% volume fraction for carbide and ~3.0% volume fraction for gamma-prime for typical CW 316 SS (with 0.054 wt.% carbon) under LWR extended life conditions. This work provides valuable insights into the magnitudes and mechanisms of precipitation in irradiated CW 316 SS for nuclear applications.
Prakruti maye : Using Virtual Reality to deconstruct insect ecology
Creators: name: Kaushik, Pavan Kumar
Publisher: name: Zenodo
Year: 2022
Subjects: Virtual Reality
VR
Neuroethology
Animal Behaviour
Insect
Decision making
Multimodal Sensory Integration

description: The exemplary search capabilities of flying insects have established them as one of the most diverse taxa on Earth. However, we still lack the fundamental ability to quantify, represent, and predict trajectories under natural contexts to understand search and its applications. For example, flying insects have evolved in complex multimodal three-dimensional (3D) environments, but we do not yet understand which features of the natural world are used to locate distant objects. Here, we independently and dynamically manipulate 3D objects, airflow fields, and odor plumes in virtual reality over large spatial and temporal scales. We demonstrate that flies make use of features such as foreground segmentation, perspective, motion parallax, and integration of multiple modalities to navigate to objects in a complex 3D landscape while in flight. We first show that tethered flying insects of multiples species navigate to virtual 3D objects. Using the apple fly Rhagoletis pomonella, we then measure their reactive distance to objects and show that these flies use perspective and local parallax cues to distinguish and navigate to virtual objects of different sizes and distances. We also show that apple flies can orient in the absence of optic flow by using only directional airflow cues, and require simultaneous odor and directional airflow input for plume following to a host volatile blend. The elucidation of these features unlocks the opportunity to quantify parameters underlying insect behavior such as reactive space, optimal foraging, and dispersal, as well as develop strategies for pest management, pollination, robotics, and search algorithms.
Affine Anosov representations and proper actions
Creators: name: Ghosh, Sourav
name: Treib, Nicolaus
Publisher: name: arXiv
Year: 2017
Subjects: subject: Geometric Topology (math.GT)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: We define the notion of affine Anosov representations of word hyperbolic groups into the affine group $\mathsf{SO}^0(n+1,n)\ltimes\mathbb{R}^{2n+1}$. We then show that a representation $ρ$ of a word hyperbolic group is affine Anosov if and only if its linear part $\mathtt{L}_ρ$ is Anosov in $\mathsf{SO}^0(n+1,n)$ with respect to the stabilizer of a maximal isotropic plane and $ρ(Γ)$ acts properly on $\mathbb{R}^{2n+1}$.
description: 25 pages, Minor changes
Tech Demo
Creators: name: Eckel, Julia
name: Ernst, Christoph
name: Schröter, Jens
name: Rosental, Claude
name: Gowanlock, Jordan
name: Hastik, Canan
name: Rein, Katharina
name: Grampp, Sven
name: Meis, Mareike
Publisher: name: Universitätsbibliothek Siegen
Year: 2023
Subjects: subject: 302.23 Medien (Kommunikationsmittel), Medienwissenschaft
subject: Demonstration
subject: Technology
subject: Media
subject: Technologie
subject: Medien
subject: Technologie
subject: Medien
subject: Demonstration
subject: Medientechnik

description: "Tech Demo" deals with the twofold connection between demonstration and technology. On the one hand, the volume focusses on technology demonstrations as cultural and instrumental practices in the contexts of technology- and media-development. On the other hand, the contributions highlight the technologization of demonstrations regarding the reliance of (political) demonstrations on media technologies. Building on this nexus, demonstrations appear as mediahistorically and -theoretically significant sites that reveal and negogiate intersections of technology, individual, and society, politics, performance, and aesthetics, as well as human and technical scopes of 'agency'.
Singlet-Doublet Fermionic Dark Matter, Neutrino Mass and Collider Signatures
Creators: name: Bhattacharya, Subhaditya
name: Sahoo, Nirakar
name: Sahu, Narendra
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a minimal extension of the standard model (SM) by including a scalar triplet with hypercharge 2 and two vector-like leptons: one doublet and a singlet, to explain simulatenously the non-zero neutrino mass and dark matter (DM) content of the Universe. The DM emerges out as a mixture of the neutral component of vector-like lepton doublet and singlet, being odd under a discrete $Z_2$ symmetry. After electroweak symmetry breaking the triplet scalar gets an induced vev, which give Majorana masses not only to the light neutrinos but also to the DM. Due to the Majorana mass of DM, the $Z$ mediated elastic scattering with nucleon is forbidden. However, the Higgs mediated direct detection cross-section of the DM gives an excellent opportunity to probe it at Xenon-1T. The DM can not be detected at collider. However, the charged partner of the DM (often next-to-lightest stable particle) can give large dispalced vertex signature at the Large Hadron Collider (LHC).
description: New references added,Accepted for publication in Physical Review D
Primitive values of quadratic polynomials in a finite field
Creators: name: Booker, Andrew R.
name: Cohen, Stephen D.
name: Sutherland, Nicole
name: Trudgian, Tim
Publisher: name: arXiv
Year: 2018
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11T30, 11Y16

description: We prove that for all $q>211$, there always exists a primitive root $g$ in the finite field $\mathbb{F}_{q}$ such that $Q(g)$ is also a primitive root, where $Q(x)= ax^2 + bx + c$ is a quadratic polynomial with $a, b, c\in \mathbb{F}_{q}$ such that $b^{2} - 4ac \neq 0$.
description: 12 pages; code available at https://arxiv.org/src/1803.01435v2/anc/
Searching for two-dimensional Weyl superconductors in heterostructures
Creators: name: Hao, Lei
name: Ting, C. S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Two-dimensional Weyl superconductor is the most elusive member of a group of materials with Weyl fermions as low-energy excitations. Here, we propose to realize this state in a heterostructure consisting of thin films of half-metal and spin-singlet superconductor. In particular, for the $d$-wave case, a very robust two-dimensional Weyl superconductor (dWSC) is realized independent of the orientation of the spontaneous magnetization of the half-metal. The quasiparticle spectra of the dWSC show interesting evolution with the direction of the magnetization, featured by a series of Lifshitz transitions in the zero-energy contour of the quasiparticle spectrum. For a general magnetization orientation of the half-metal, the state is a combination of a superconducting component and a normal fluid component and is different from all known forms of pairings. In addition, we find a transition between type-I and type-II Weyl nodes. This is also the first example of a type-II Weyl node in the presence of superconducting correlation. The symmetries and topological properties of the system are analyzed. We also study the phases in the heterostructure with the half-metal replaced by a ferromagnetic metal with a partially spin-polarized Fermi surface.
description: 17 pages, 10 figures
21-05-2022 Fisiología del sistema reproductor de la hembra canina y pseudogestación
Creators: name: Cadenas Neri, Carlos Alberto
name: Zorrilla Padilla, Esteban
Publisher: name: Zenodo
Year: 2022
Subjects: reproducción canina; pseudogestación; hormonas; progesterona; prolactina

description: RESUMEN El proceso de la reproducción canina va mediado por los órganos reproductores que cumplen con funciones específicas y estos van mediados de hormonas [1]; las cuales a través de ellas van iniciando etapas que se les llama ciclo estral. El ciclo estral se conforma de cuatro etapas [2], durante cada etapa la hembra toma diferentes características para la aceptación del macho y de la monta. Las hormonas que se presentan en las etapas como la GnRH, la FSH, la LH, entre otras más, son las encargadas del correcto funcionamiento en la fisiología reproductiva [3]. Después de la monta hay dos situaciones que puede pasar, la primera es que la hembra si quede preñada y la segunda es que la hembra no quede preñada, pero presente signos y síntomas de una hembra preñada, a esto se le conoce como pseudogestacion y es algo que se presenta con normalidad [4]. La pseudogestación es el proceso fisiológico el cual ocurre por trastornos que se generan en los órganos reproductivos a causa de la disminución de los niveles de la progesterona y el aumento de la prolactina [4]. La prolactina va a generar la lactación y el comportamiento de forma materna de la pseudogestacion, esto ocurre al final del diestro. la pseudogestacion se considera como un fenómeno normal, no está asociado con anormalidades reproductivas [4]. Está caracterizada por la exhibición de comportamientos maternos, el desarrollo glandular mamario, agrandamiento abdominal, anorexia y vómitos [5]. Cuando se presenta la pseudogestacion se puede resolver con tratamientos específicos y evitar que se generen problemas secundarios como consecuencia de esto. Una complicación de la pseudogestación es la mastitis [6].
description: {"references": ["Barbara L. Hoffman, John O. Shorge, Josph I. Schaffer, Lisa M. Halvorson, Karen D. Bradshaw, F. Gary Cunningham. Williams Ginecolog\u00eda [internet]. Texas. mc gram hill education. 2008.", "Le\u00f3n NVS. Evaluaci\u00f3n de la producci\u00f3n invitro de embriones en animales dom\u00e9sticos en el laboratorio de biotecnolog\u00eda de la reproducci\u00f3n en la carrera de medicina veterinaria de la Universidad T\u00e9cnica de Cotopaxi [internet]. Universidad t\u00e9cnica de Cotopaxi. 2014", "Universidad Cat\u00f3lica de Chile. Hormonas reproductivas y ciclos ov\u00e1ricos en las hembras [Internet]. Producci\u00f3n animal.", "Canine Pseudopregnancy [Internet]. Animal Health Topics / School of Veterinary Medicine. 2021.", "Phantom Pregnancy in Dogs - Symptoms & Treatment | Purina [Internet]. PURINA.", "D. G. False Pregnancy in Dogs [Internet]. Firstvet. 2021."]}
Effect of CP violation in the singlet-doublet dark matter model
Creators: name: Abe, Tomohiro
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We revisit the singlet-doublet dark matter model with a special emphasis on the effect of CP violation on the dark matter phenomenology. The CP violation in the dark sector induces a pseudoscalar interaction of a fermionic dark matter candidate with the SM Higgs boson. The pseudoscalar interaction helps the dark matter candidate evade the strong constraints from the dark matter direct detection experiments. We show that the model can explain the measured value of the dark matter density even if dark matter direct detection experiments do not observe any signal. We also show that the electron electric dipole moment is an important complement to the direct detection for testing this model. Its value is smaller than the current upper bound but within the reach of future experiments.
description: 13 pages, 5 figures, version accepted by PLB
Stability and instability properties of rotating Bose-Einstein condensates
Creators: name: Arbunich, Jack
name: Nenciu, Irina
name: Sparber, Christof
Publisher: name: arXiv
Year: 2018
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35Q41, 35B35, 35B07

description: We consider the mean-field dynamics of Bose-Einstein condensates in rotating harmonic traps and establish several stability and instability properties for the corresponding solution. We particularly emphasize the difference between the situation in which the trap is symmetric with respect to the rotation axis and the one where this is not the case.
description: 13 pages; corrected a systematic typo
Generalized Seniority on Deformed Single-Particle Basis
Creators: name: Jia, L. Y.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Recently we proposed [62] a fast computing scheme for generalized seniority on spherical single-particle basis. This work redesigns the scheme to make it applicable to deformed single-particle basis. The algorithm is applied to the rare-earth nucleus $^{158}_{~64}$Gd$_{94}$ for intrinsic (body-fixed frame) neutron excitations under the low-momentum {\emph{NN}} interaction $V_{\rm{low}-k}$. By allowing as many as four broken pairs, we compute the lowest $300$ intrinsic states of several multipolarity. These states converge well to the exact ones, showing generalized seniority is very effective in truncating the deformed shell model. Under realistic interactions, the picture remains approximately valid that the ground state is a coherent pair condensate, and the pairs gradually break up as excitation energy increases.