bluuebunny/crossref_metadata_2025_split huggingface dataset:
Revolution and Redemption in Central America
Authors: Coleman Kevin 
Published: May 2022

This essay reviews the following works:
The World Come of Age: An Intellectual History of Liberation Theology. By Lilian Calles Barger. New York: Oxford University Press, 2018. Pp. x + 376. $34.95 hardcover. ISBN: 9780190695392.The Latino Christ in Art, Literature, and Liberation Theology. By Michael R. Candelaria. Albuquerque: University of New Mexico Press, 2018. Pp. 248. $65.00 hardcover. ISBN: 9780826358790.Óscar Romero’s Theological Vision: Liberation and the Transfiguration of the Poor. By Edgardo Colón-Emeric. Notre Dame, IN: University of Notre Dame Press, 2018. Pp. xvi + 400. $39.00 hardcover. ISBN: 9780268104733.La guerra por otros medios: Comunicación insurgente y proceso revolucionario en El Salvador (1970–1992). By Eudald Cortina Orero. San Salvador: UCA Editores, 2017. Pp. 563. $13.00. ISBN: 9789996110375.Ixcán: Pastoral de acompañamiento en área de guerra, Guatemala 1981–1987. By Ricardo Falla. Vol. 5, part 1 of Al atardecer de la vida. Guatemala: Asociación para el Avance de las Ciencias Sociales en Guatemala, 2017. ISBN: 9789929663015.Las lógicas del genocidio guatemalteco: Febrero 1982 a agosto 1983. By Ricardo Falla. Vol. 6 of Al atardecer de la vida. Guatemala: Asociación para el Avance de las Ciencias Sociales en Guatemala, 2018. ISBN: 9789929663015.What You Have Heard Is True: A Memoir of Witness and Resistance. By Carolyn Forché. New York: Penguin, 2020. Pp. 400. $18.00 paperback. ISBN: 9780525560395.Caribbean Revolutions: Cold War Armed Movements. By Rachel A. May, Alejandro Schneider, and Roberto González Arana. Cambridge: Cambridge University Press, 2018. Pp. 174. $24.99 paperback. ISBN: 9781108440905.After Insurgency: Revolution and Electoral Politics in El Salvador. By Ralph Sprenkels. Notre Dame, IN: University of Notre Dame Press, 2018. Pp ix + 484. $50.00 hardcover. ISBN: 9780268103255.Blood in the Fields: Óscar Romero, Catholic Social Teaching, and Land Reform. By Matthew Philipp Whelan. Washington, DC: Catholic University of America Press, 2020. Pp. 336. $65.00 hardcover. ISBN: 9780813232522.
El muralismo zapatista: Una revuelta estética
Authors: Martí i Puig Salvador 
Published: May 2022

ResumenEl trabajo trata cómo el zapatismo ha abordado estéticamente su proyecto político de transformación y a qué frutos estéticos ha llegado. Para ello se realiza una interpretación de cómo se ha creado y recreado la identidad zapatista a través del lenguaje visual de los 203 murales que están en los territorios donde se asientan los Municipios Autónomos Rebeldes Zapatistas, y cómo esta identidad interpela a la imaginería revolucionaria mexicana oficial y crea una nueva iconografía activista para sus bases y para el movimiento de solidaridad. El trabajo se inspira teóricamente en la obra de Geneviève Zubrzycki sobre creación y reestructuración iconográfica, y concluye que el muralismo zapatista tiene rasgos comunes fruto de una amalgama de concepciones no explicitadas de diversos sujetos externos e internos que han ido afrontando de diferentes maneras la vinculación entre arte y transformación social.
MAGNETIC (QUASI-)MODULAR FORMS
Authors: PAŞOL VICENŢIU , ZUDILIN WADIM 
Published: May 2022

AbstractA (folklore?) conjecture states that no holomorphic modular form
$F(\tau )=\sum _{n=1}^{\infty } a_nq^n\in q\mathbb Z[[q]]$
exists, where
$q=e^{2\pi i\tau }$
, such that its anti-derivative
$\sum _{n=1}^{\infty } a_nq^n/n$
has integral coefficients in the q-expansion. A recent observation of Broadhurst and Zudilin, rigorously accomplished by Li and Neururer, led to examples of meromorphic modular forms possessing the integrality property. In this note, we investigate the arithmetic phenomenon from a systematic perspective and discuss related transcendental extensions of the differentially closed ring of quasi-modular forms.
Consensus embedding for multiple networks: Computation and applications
Authors: Li Mengzhen , Coşkun Mustafa , Koyutürk Mehmet 
Published: May 2022

AbstractMachine learning applications on large-scale network-structured data commonly encode network information in the form of node embeddings. Network embedding algorithms map the nodes into a low-dimensional space such that the nodes that are “similar” with respect to network topology are also close to each other in the embedding space. Real-world networks often have multiple versions or can be “multiplex” with multiple types of edges with different semantics. For such networks, computation ofConsensus Embeddings based on the node embeddings of individual versions can be useful for various reasons, including privacy, efficiency, and effectiveness of analyses. Here, we systematically investigate the performance of three dimensionality reduction methods in computing consensus embeddings on networks with multiple versions: singular value decomposition, variational auto-encoders, and canonical correlation analysis (CCA). Our results show that (i) CCA outperforms other dimensionality reduction methods in computing concensus embeddings, (ii) in the context of link prediction, consensus embeddings can be used to make predictions with accuracy close to that provided by embeddings of integrated networks, and (iii) consensus embeddings can be used to improve the efficiency of combinatorial link prediction queries on multiple networks by multiple orders of magnitude.
Using fractured outcrops to calculate permeability tensors: implications for geothermal fluid flow and the influence of seismic-scale faults
Authors: Smith Ruaridh Y. , Lesueur Martin , Kelka Ulrich , Poulet Thomas , Koehn Daniel 
Published: May 2022

AbstractFaulted and fractured systems form a critical component of fluid flow, especially within low-permeable reservoirs. Therefore, developing suitable methodologies for acquiring structural data and simulating flow through fractured media is vital to improve efficiency and reduce uncertainties in modelling the subsurface. Outcrop analogues provide excellent areas for the analysis and characterization of fractures within the reservoir rocks where subsurface data are limited. Variation in fracture arrangement, distribution and connectivity can be obtained from 2D fractured cliff sections and pavements. These sections can then be used for efficient discretization and homogenization techniques to obtain reliable predictions on permeability distributions in the geothermal reservoirs. Fracture network anisotropy in the Malm reservoir unit is assessed using detailed structural analysis and numerical homogenization of outcrop analogues from an open pit quarry within the Franconian Basin, Germany. Several events are recorded in the fracture networks from the Late Jurassic the Alpine Orogeny and are observed to be influenced by the Kulmbach Fault nearby with a reverse throw of 800 m. The fractured outcrops are digitized for fluid flow simulations and homogenization to determine the permeability tensors of the networks. The tensors show differences in fluid transport direction where fracture permeability is controlled by orientation compared to a constant value. As a result, it is observed that the orientation of the tensor is influenced by the Kulmbach Fault, and therefore faults within the reservoirs at depth should be considered as important controls on the fracture flow of the geothermal system.
Why might God create?
Authors: Mawson T. J. 
Published: May 2022

AbstractSome have held that this question cannot be given a satisfactory answer within the constraints imposed by a traditional theistic framework, a framework which sees the universe as contingent on God's free choice to create it. However, I shall argue that, while traditional theism certainly does place constraints on possible answers to the title question, on assumptions which are themselves plausible, these constraints leave open various possibilities for understanding the reasons God may have had as He decided whether or not to create something other than Himself.
Better vaguely right than precisely wrong in effective altruism: the problem of marginalism
Authors: Côté Nicolas , Steuwer Bastian 
Published: May 2022

AbstractEffective altruism (EA) requires that when we donate to charity, we maximize the beneficial impact of our donations. While we are in broad sympathy with EA, we raise a practical problem for EA, which is that there is a crucial empirical presupposition implicit in its charity assessment methods which is false in many contexts. This is the presupposition that the magnitude of the benefits (or harms) generated by some charity vary continuously in the scale of the intervention performed. We characterize a wide class of cases where this assumption fails, and then draw out the normative implications of this fact.
Conformally invariant complete metrics
Authors: SUGAWA TOSHIYUKI , VUORINEN MATTI , ZHANG TANRAN 
Published: May 2022

AbstractFor a domain G in the one-point compactification
$\overline{\mathbb{R}}^n = {\mathbb{R}}^n \cup \{ \infty\}$
of
${\mathbb{R}}^n, n \geqslant 2$
, we characterise the completeness of the modulus metric
$\mu_G$
in terms of a potential-theoretic thickness condition of
$\partial G\,,$
Martio’s M-condition [35]. Next, we prove that
$\partial G$
is uniformly perfect if and only if
$\mu_G$
admits a minorant in terms of a Möbius invariant metric. Several applications to quasiconformal maps are given.
Transversal Ck-factors in subgraphs of the balanced blow-up of Ck
Authors: Ergemlidze Beka , Molla Theodore 
Published: May 2022

AbstractFor a subgraph
$G$
of the blow-up of a graph
$F$
, we let
$\delta ^*(G)$
be the smallest minimum degree over all of the bipartite subgraphs of
$G$
induced by pairs of parts that correspond to edges of
$F$
. Johansson proved that if
$G$
is a spanning subgraph of the blow-up of
$C_3$
with parts of size
$n$
and
$\delta ^*(G) \ge \frac{2}{3}n + \sqrt{n}$
, then
$G$
contains
$n$
vertex disjoint triangles, and presented the following conjecture of Häggkvist. If
$G$
is a spanning subgraph of the blow-up of
$C_k$
with parts of size
$n$
and
$\delta ^*(G) \ge \left(1 + \frac 1k\right)\frac n2 + 1$
, then
$G$
contains
$n$
vertex disjoint copies of
$C_k$
such that each
$C_k$
intersects each of the
$k$
parts exactly once. A similar conjecture was also made by Fischer and the case
$k=3$
was proved for large
$n$
by Magyar and Martin.In this paper, we prove the conjecture of Häggkvist asymptotically. We also pose a conjecture which generalises this result by allowing the minimum degree conditions in each bipartite subgraph induced by pairs of parts of
$G$
to vary. We support this new conjecture by proving the triangle case. This result generalises Johannson’s result asymptotically.
From Rationality to Morality: The Collective Development of Practical Reason in Kant’s Moral Anthropology
Authors: Lenczewska Olga 
Published: May 2022

AbstractWhile Kant’s account of humankind’s rational progress has been widely discussed, his speculative views about the way in which this progress might havebegunand the circumstances surrounding this beginning have been largely neglected. Implicit in such an omission is the assumption that Kant does not say much about the very beginning of human history or that whatever he says is of little philosophical value. This article challenges these assumptions. I reconstruct Kant’s account of the emergence of reason by looking at his various conjectural and more literal remarks about our species’ transition from mere irrational animals into primitive human beings possessing a rudimentary form of rationality. Next, I show how this account fits with Kant’s broader view of humankind’s rational progress and its subsequent stages. By doing so, I elucidate Kant’s guidelines for achieving this progress in the future by unifying them with his regulative view of reason’s past.
Early modern Iberian empires, global history and the history of early globalization
Authors: Yun-Casalilla Bartolomé 
Published: May 2022

AbstractThis essay discusses the main lines of current research on the social and economic history of the early modern Iberian worlds. It then goes on, in light of recent debates, to make the case for the value of a purposeful dialogue between global history and imperial history. The issues of primary concern here are the extent to which lateral, inter-regional relations in the Iberian worlds dominated vertical relations connecting particular areas to Madrid or Lisbon; how power and agency on local scales may be integrated into accounts of flows and interactions on larger scales; the ways in which the history of the Iberian empires through a global prism breaks with pre-existing nationalistic narratives; and whether or not the decentralized component of these empires was unique to them. Finally, examples are detailed of how Iberian imperial history can provide a fruitful basis for a polycentric history of globalization. The examples given take heart from critical engagement with the Great Divergence paradigm, the new analytical potentialities of global ecological history, the constructive and destructive impact of globalization upon empires, and the importance of studying the history of empires comparatively.
Chaos identification through the auto-correlation function indicator (ACFI)
Authors: Carruba Valerio , Aljbaae Safwan , Domingos Rita C. , Huaman Mariela , Barletta William 
Published: May 2022

AbstractClose encounters or resonances overlaps can create chaotic motion in small bodies in the Solar System. Approaches that measure the separation rate of trajectories that start infinitesimally near, or changes in the frequency power spectrum of time series, among others, can discover chaotic motion. In this paper, we introduce the ACF index (ACFI), which is based on the auto-correlation function of time series. Auto-correlation coefficients measure the correlation of a time-series with a lagged duplicate of itself. By counting the number of auto-correlation coefficients that are larger than 5% after a certain amount of time has passed, we can assess how the time series auto-correlates with each other. This allows for the detection of chaotic time-series characterized by low ACFI values.
Some of the most interesting cases of close asteroid pairs perturbed by resonance
Authors: Rosaev A. , Plavalova Eva 
Published: May 2022

AbstractWe have randomly selected 20 close asteroid pairs (younger than 800 kyr) from known pairs, and by the application of backward numerical integration we have calculated their orbits. For the reason of speeding up the process of making the resonances visible, we have used a high value of Yarkowsky drift. The results of the calculation show that only two pairs appear to have a simple resonance with Earth and Jupiter while half of the tested pairs are visibly in the vicinity of three-body resonances.We have found a 2-1J-1M resonance for the pair (56232) 1999 JM31 and (115978) 2003 WQ56. Following our study of the pair (10123) Fideoja and (117306) 2004 VF21, we discovered a different resonance than the 7-2J mean motion resonance previously published: we have proved that this pair is perturbed by 9-6J-4M three body resonance.
On the scattering and dynamical evolution of Oort cloud comets caused by a stellar fly-by
Authors: Pilat-Lohinger E. , Clees S. , Zimmermann M. , Loibnegger B. 
Published: May 2022

AbstractRecent GAIA observations revealed that the K-type star Gliese 710 will cross the Oort cloud in a distance between approximately 4000 and 12000 au in about 1.3 Myrs. This occurrence motivated us to study the influence of a stellar encounter on comets in the outer region of the solar system. Even if the Oort cloud extends to 100000 au from the sun, we restrict our study to the region between 30 and 25000 au where 25 million objects are distributed randomly. Comets at larger distances are not taken into account as they hardly enter the observable region after a single stellar fly-by. An overview of all objects that are scattered towards the sun for the different fly-by distances at 4000, 8000 and 12000 au shows that only a handful of objects are moving towards the sun immediately after the stellar encounter.However, a subsequent long-term study of all objects that are moved into highly eccentric motion by the stellar fly-by shows a significant increase of comets crossing Jupiter’s orbit and entering into the observable region. In addition, our study shows the first comets crossing the orbit of Earth only about 2.5 Myrs after the stellar fly-by. Thus, the impact risk for the Earth increases only some million years after the stellar fly-by.
A cartographic study of spin-orbit coupling in binary asteroids
Authors: Nadoushan Mahdi Jafari 
Published: May 2022

AbstractIn the spin-orbit resonances, we assume that the orbit of the secondary asteroid around the primary is invariant, which is a reasonable assumption at first glance. Owing to the irregularity of asteroids’ geometry and their effect on the mutual orbit, this assumption should be revised. Therefore, we focus on a binary asteroid with a spherical primary and a secondary with an irregular shape. When the shape of a secondary asteroid is not a sphere, the gravitational interaction is important, and we should consider the interaction of orbit and spin. We generate fast Lyapunov indicator (FLI) maps for both spin-orbit resonance and spin-orbit coupling problems and investigate the effect of orbit alternation on the structure of phase space.
The effect of the passage of Gliese 710 on Oort cloud comets
Authors: Loibnegger Birgit , Pilat-Lohinger Elke , Zimmermann Max , Clees Sharleena 
Published: May 2022

AbstractBased on observations by Bailer-Jones et al. (2018) who propose a close fly-by of the K-type star Gliese 710 in approximately 1.36 Myr we investigate the immediate influence of the stellar passage on trajectories of Oort cloud objects. Using a newly developed GPU-based N-body code (Zimmermann (2021)) we study the motion of 3.6 million testparticles in the outer Solar system where the comets are distributed in three different “layers” around the Sun and the 4 giant planets. We study the immediate influence of Gliese 710 at three passage distances of 12000, 4300, and 1200 au. Additionally, different inclinations of the approaching star are considered. Depending on the passage distance a small number of comets (mainly from the disk and flared disk) is scattered into the observable region (< 5 au) around the Sun. In addition, a huge number of comets (mainly the ones directly in the path of the passing star) shows significant changes of their perihelia. But, they will enter the inner Solar system a long time after the stellar fly-by depending on their dynamical evolution.
Planetary and lunar ephemeris EPM2021 and its significance for Solar system research
Authors: Pitjeva Elena , Pavlov Dmitry , Aksim Dan , Kan Margarita 
Published: May 2022

AbstractWe present an updated public version of EPM (Ephemerides of Planets and the Moon). Since the last public version, EPM2017, many improvements were made in both the observational database and the mathematical model. Latest lunar laser ranging observations have been added, as well as radio ranges of Juno spacecraft and more recent ranges of Odyssey and Mars Reconnaissance Orbiter. EPM2021 uses a new improved way to calculate radio signal delays in solar plasma and has a major update in the method of determination of asteroid masses. Also, a delay-capable multistep numerical integrator was implemented for EPM in order to properly account for tide delay in the equations of the motion of the Moon. The improved processing accuracy has allowed to refine existing estimates of the mass of the Sun and its change rate, parameters of the Earth–Moon system, masses of the Main asteroid belt and the Kuiper belt; and also to raise important questions about existing numerical models of solar wind.
Orbit propagation around small bodies using spherical harmonic coefficients obtained from polyhedron shape models
Authors: Peñarroya P. , Paoli R. 
Published: May 2022

AbstractMissions to asteroids have been the trend in space exploration for the last years. They provide information about the formation and evolution of the Solar System, contribute to direct planetary defense tasks, and could be potentially exploited for resource mining. Be their purpose as it may, the factor that all these mission types have in common is the challenging dynamical environment they have to deal with. The gravitational environment of a certain asteroid is most of the times not accurately known until very late mission phases when the spacecraft has already orbited the body for some time.Shape models help to estimate the gravitational potential with a density distribution assumption (usually constant value) and some optical measurements of the body. These measurements, unlike the ones needed for harmonic coefficient estimation, can be taken from well before arriving at the asteroid’s sphere of influence, which allows to obtain a better approximation of the gravitational dynamics much sooner. The disadvantage they pose is that obtaining acceleration values from these models implies a heavy computational burden on the on-board processing unit, which is very often too time-consuming for the mission profile.In this paper, the technique developed on [1] is used to create a validated Python-based tool that obtains spherical harmonic coefficients from the shape model of an asteroid or comet, given a certain density for the body. This validated software suite, called AstroHarm, is used to analyse the accuracy of the models obtained and the improvements in computational efficiency in a simulated spacecraft orbiting a small body.The results obtained are shown offering a qualitative comparison between different order spherical harmonic models and the original shape model. Finally, the creation of a catalogue for harmonics is proposed together with some thoughts on complex modelling using this tool.
Apsidal alignment in migrating dust - Crescent features caused by eccentric planets
Authors: Sommer Maximilian , Pokorný Petr , Yano Hajime , Srama Ralf 
Published: May 2022

AbstractCircumstellar discs are known to exist in great variety, from gas-rich discs around the youngest stars to evolved debris discs such as the solar system’s zodiacal cloud. Through gravitational interaction, exoplanets embedded in these discs can generate density variations, imposing potentially observable structural features on the disc such as rings or gaps. Here we report on a mirrored double crescent pattern arising in simulations of discs harbouring a small, moderately eccentric planet - such as Mars. We show that the structure is a result of a directed apsidal precession occurring in particles that migrate the planet’s orbital region under Poynting-Robertson drag. We further analyze the strength of this effect with respect to planet and particle parameters.
A numerical criterion evaluating the robustness of planetary architectures; applications to the υ Andromedæ system
Authors: Locatelli Ugo , Caracciolo Chiara , Sansottera Marco , Volpi Mara 
Published: May 2022

AbstractWe revisit the problem of the existence of KAM tori in extrasolar planetary systems. Specifically, we consider the υ Andromedæ system, by modelling it with a three-body problem. This preliminary study allows us to introduce a natural way to evaluate the robustness of the planetary orbits, which can be very easily implemented in numerical explorations. We apply our criterion to the problem of the choice of a suitable orbital configuration which exhibits strong stability properties and is compatible with the observational data that are available for the υ Andromedæ system itself.