Hasil untuk "History of Spain"

Ana Echevarría Arsuaga, José Eloy Hortal Muñoz, Elena Paulino Montero

F. J. Acero, M. I. Fernández-Fernández, V. M. S. Carrasco et al.

Heat wave (HW) events are becoming more frequent, and they have important consequences because of the negative effects they can have not only on the human population in health terms, but also on biodiversity and agriculture. This motivated a study of the trends in HW events over Extremadura, a region in the southwest of Spain, with much of its area in summer devoted to the production of irrigated crops such as maize and tomatoes. Heat waves were defined for the study as two consecutive days with temperatures above the 95th percentile of the summer (June-August) maximum temperature (Tmax) time series. Two datasets were used: one consisted of 13 daily temperature records uniformly distributed over the Region, and the other was the SPAIN02 gridded observational dataset, extracting just the points corresponding to Extremadura. The trends studied were in the duration, intensity, and frequency of HW events, and in other parameters such as the mean, low (25th percentile), and high (75th percentile) values. In general terms, the results showed significant positive trends in those parameters over the east, the northwest, and a small area in the south of the Region. In order to study changes in HW characteristics (duration, frequency and intensity) considering different subperiods, a stochastic model was used to generate 1000 time series equivalent to the observed ones. The results showed that there were no significant changes in HW duration in the last 10-year subperiod in comparison with the first. But the results were different for warm events (WE), defined with a lower threshold (the 75th percentile), which are also important for agriculture. For several sites, there were significant changes in WE duration, frequency, and intensity.

Piotr Marciniak

Chambers of commerce play an important role for entrepreneurs and the economy. However, their position, organization, effectiveness and tasks vary from country to country. The challenges of the 21st-century economy require the strengthening of chambers so that they can effectively support business. We should look for possible improvements. Chambers are usually categorized into three main models: Anglo-Saxon, continental and mixed. An additional public (or administrative) model is sometimes added. The analysis of the literature shows, however, that the assignment of chambers to models is sometimes arbitrary or customary. This results in different classification of some countries into specific models – e.g. Poland is assigned to the Anglo-Saxon or mixed model, while Spain is placed in the continental model, although some features of their chambers indicate the properties of the mixed model. The systematic confusion stems from the fact that the current taxonomy is too general to address effectively some of the most important differences between chambers operating in more than 200 countries. But more important is that its design does not provide tools and information that (in the increasing complexity of today’s economy) could support the development of chambers based on the results of comparative research. This article outlines a set of the key differences between British, Polish and Belgian chambers of commerce with several references to Canadian and US chambers. They are all private law and generally listed as Anglo-Saxon model members. But there are major differences between them. It’s important to examine foreign systems when changes to the domestic chambers are considered. It should be clear that there is no single and common framework that can be just replicated. Each country’s history, economy and social norms must be considered before changes are made. This is why comparative studies are the key to finding the best improvements for local needs.

Ian Foster, Carl Kesselman

With the widespread availability of high-speed networks, it becomes feasible to outsource computing to remote providers and to federate resources from many locations. Such observations motivated the development, from the mid-1990s onwards, of a range of innovative Grid technologies, applications, and infrastructures. We review the history, current status, and future prospects for Grid computing.

Lauren Greenspan

Based on string theory's framework, the gauge/gravity duality, also known as holography, has the ability to solve practical problems in low energy physical systems like metals and fluids. Holographic applications open a path for conversation and collaboration between the theory-driven, high energy culture of string theory and fields like nuclear and condensed matter physics, which in contrast place great emphasis on the empirical evidence that experiment provides. This paper takes a look at holography's history, from its roots in string theory to its present-day applications that are challenging the cultural identity of the field. I will focus on two of these applications: holographic QCD and holographic superconductivity, highlighting some of the (often incompatible) historical influences, motives, and epistemic values at play, as well as the subcultural shifts that help the collaborations work. The extent to which holographic research -- arguably string theory's most successful and prolific area -- must change its subcultural identity in order to function in fields outside of string theory reflects its changing nature and the field's uncertain future. Does string theory lose its identity in the low-energy applications that holography provides? Does holography still belong under string theory's umbrella, or is it destined to form new subcultures with each of its fields of application? I find that the answers to these questions are dynamic, interconnected, and highly dependent on string theory's relationship with its field of application. In some cases, holography can maintain the goals and values it inherited from string theory. In others, it instead adopts the goals and values of the field in which it is applied. These examples highlight a need for the STS community to expand its treatment of string theory beyond its relationship with empiricism and role as a theory of quantum gravity.

J. Cenoz, D. Gorter

JASONE CENOZ1 and DURK GORTER2,3 1University of the Basque Country, UPV/EHU, Department of Research Methods in Education, Faculty of Education, Philosophy, and Anthropology, Donostia–San Sebastian, Spain Email: jasone.cenoz@ehu.es 2University of the Basque Country, UPV/EHU, Department of Theory and History of Education, Donostia–San Sebastian, Spain Email: d.gorter@ikerbasque.org 3Ikerbasque, Basque Foundation for Science, Bilbao, Spain

Raphael Watschinger, Michal Merta, Günther Of et al.

We present a novel approach to the parallelization of the parabolic fast multipole method for a space-time boundary element method for the heat equation. We exploit the special temporal structure of the involved operators to provide an efficient distributed parallelization with respect to time and with a one-directional communication pattern. On top, we apply a task-based shared memory parallelization and SIMD vectorization. In the numerical tests we observe high efficiencies of our parallelization approach.

A. Cini, G. Anfora, L. Escudero-Colomar et al.

Avery E. Broderick, Roman Gold, Mansour Karami et al.

The Event Horizon Telescope (EHT) provides the unprecedented ability to directly resolve the structure and dynamics of black hole emission regions on scales smaller than their horizons. This has the potential to critically probe the mechanisms by which black holes accrete and launch outflows, and the structure of supermassive black hole spacetimes. However, accessing this information is a formidable analysis challenge for two reasons. First, the EHT natively produces a variety of data types that encode information about the image structure in nontrivial ways; these are subject to a variety of systematic effects associated with very long baseline interferometry and are supplemented by a wide variety of auxiliary data on the primary EHT targets from decades of other observations. Second, models of the emission regions and their interaction with the black hole are complex, highly uncertain, and computationally expensive to construct. As a result, the scientific utilization of EHT observations requires a flexible, extensible, and powerful analysis framework. We present such a framework, Themis , which defines a set of interfaces between models, data, and sampling algorithms that facilitates future development. We describe the design and currently existing components of Themis , how Themis has been validated thus far, and present additional analyses made possible by Themis that illustrate its capabilities. Importantly, we demonstrate that Themis is able to reproduce prior EHT analyses, extend these, and do so in a computationally efficient manner that can efficiently exploit modern high-performance computing facilities. Themis has already been used extensively in the scientific analysis and interpretation of the first EHT observations of M87.

Paula Baldwin Lind

This article reviews part of the stage history of Shakespeare’s Othello in Chile and, in particular, it focuses on two performances of the play: the first, in 1818, and the last one in 2012-2020. By comparing both productions, I aim to establish the exact date and theatrical context of the first Chilean staging of the Shakespearean tragedy using historical sources and English travellers’ records, as well as to explore how the representation of a Moor and of blackness onstage evolved both in its visual dimension — the choice of costumes and the use of blackface—, and in its racial connotations alongside deep social changes. During the nineteenth century Othello became one of the most popular plays in Chile, being performed eleven times in the period of 31 years, a success that also occurred in Spain between 1802 and 1833. The early development of Chilean theatre was very much influenced not only by the ideas of the Spaniards who arrived in the country, but also by the available Spanish translations of Shakespeare; therefore, I argue that the first performances of Othello as Other — different in origin and in skin colour — were characterised by an imitative style, since actors repeated onstage the biased image of Moors that Spaniards had brought to Chile. While the assessment of Othello and race is not new, this article contrasts in its scope, as I do not discuss the protagonist’s actual origin, but how the changes in Chilean social and cultural contexts can reshape and reconfigure the performance of blackness and turn it into a meaningful translation of the Shakespearean Moor that activates audiences’ awareness of racism and fears of miscegenation.

F. Javier Ostos-Prieto, Javier Navarro-de Pablos, Mercedes Molina-Liñán et al.

In Andalusia (Spain), the conventual typology has shaped the urban centers of its cities following a process of implementation, which affects the traffic and internal organization of the city. In the mid-19th century, the confiscations led to the expropriation, demolition, and disappearance of a large part of their monastic spaces. The starting situations (size of cities, socioeconomic state in the 19th century or characteristics of the conventual foundations) gave rise to diverse urban responses. The bourgeoisie's need to "modernize" the cities led to the appearance of squares and the opening of new roads. On other occasions, the old factories were reused for the installation of new uses (prisons, barracks, markets, etc.), or their plots were used for new construction. Τhe case of Plaza Nueva in Seville from the demolition of the San Francisco Convent is studied. Also, together with other Andalusian examples, such as the San Antonio de Padua Convent in El Puerto, the current Plaza Isaac Peral and Los Descalzos Convent in Écija. The case of this last city constitutes the counterpoint in the convent reuse, without generating relevant urban spaces. Once again, the Plaza Nueva, due to its condition of the centrality of the Andalusian capital, constitutes the maximum exponent of this urban and symbolic revision. The economic power put into practice its urban capacity, again through architecture. It will finance new buildings as representative images of their brands, companies, and institutions. The testimonies of the convent activity, the new spaces emerged from the disentailment actions and their new contemporary symbols constitute sequential fragments of urban history. They are necessary for the cities for their valuation and heritage understanding. The study of these Andalusian cases can serve as a reference for the detection of similar processes in the European Mediterranean frame.

Kristof Petrovay

The first determination of the surface temperature of stars other than the Sun is due to the Hungarian astrophysicist Béla Harkányi. Prompted by the recent unprecedented increase in the availability of stellar temperature estimates from Gaia, coinciding with the 150th anniversary of Harkányi's birth, this article presents the life and work of this neglected, yet remarkable figure in the context of the history of stellar astrophysics.

Kuan Wang, Yao-Yuan Mao, Andrew R. Zentner et al.

The concentration parameter is a key characteristic of a dark matter halo that conveniently connects the halo's present-day structure with its assembly history. Using 'Dark Sky', a suite of cosmological $N$-body simulations, we investigate how halo concentration evolves with time and emerges from the mass assembly history. We also explore the origin of the scatter in the relation between concentration and assembly history. We show that the evolution of halo concentration has two primary modes: (1) smooth increase due to pseudo-evolution; and (2) intense responses to physical merger events. Merger events induce lasting and substantial changes in halo structures, and we observe a universal response in the concentration parameter. We argue that merger events are a major contributor to the uncertainty in halo concentration at fixed halo mass and formation time. In fact, even haloes that are typically classified as having quiescent formation histories experience multiple minor mergers. These minor mergers drive small deviations from pseudo-evolution, which cause fluctuations in the concentration parameters and result in effectively irreducible scatter in the relation between concentration and assembly history. Hence, caution should be taken when using present-day halo concentration parameter as a proxy for the halo assembly history, especially if the recent merger history is unknown.

Oláh, János, Andersen, Trond, Beshkov, Stoyan et al.

We have recognised significant incongruences among the most commonly used taxonomic characters in the European species of Wormaldia genus of the Philopotamidae caddisfly family. During taxonomical analysis and ranking procedures we have recorded incongruent, discorcordant characters also in the taxa in Rhyacophilidae, Hydropsychidae and Limnephilidae caddisfly families. Based on theoretical background we concluded that taxa of examined caddisflies and probably all living creatures are chimeric entities composed of components of different origin. Genomes and phenomes are tree-like on the surface but more reticulated in the deep. We understand chimerism with universal consequences, expanding well beyond the evolutionary tree-thinking of reductionism and determinism. Taxa are chimeric or at least chimerical in a stochastic universe under the permanent fluxes of the external and internal impacts created by intercourses between entropy and energy gradients. We have surveyed how to create and correct synonymies in the splitter/lumper perspectives along the principles of compositional and specification hierarchies understood as quantitative variability of non-adaptive neutral and qualitative stability of adaptive, non-neutral traits. We outlined how the apophantic (declaratory) hybris creates synonymies and underestimates biodiversity. After redrawing the diverging genitalic structures, particularly the speciation traits we have reinstated species status of eight taxa: W. trifida Andersen, 1983 stat.restit, stat. nov., W. albanica Oláh, 2010 stat. restit., W. bulgarica Novak, 1971 stat. nov., W. daga Oláh, 2014 stat. restit., W. graeca Oláh, 2014 stat. restit., W. busa Oláh, 2014 stat. restit., W. homora Oláh, 2014 stat. restit. W. nielseni Moretti, 1981 stat. nov. Character selection and lineage sorting procedures established the following species groups, species complexes and species clades in the European species of Wormaldia: W. occipitalis species group: W. occipitalis species complex; W. charalambi species group; W. copiosa species group; W. triangulifera species group: W. bulgarica species complex, W. khourmai species complex, W. subnigra species complex: W. asterusia species clade, W. subnigra species clade, W. vercorsica species clade; W. triangulifera species complex, W. variegate species complex. Unplaced species: W. ambigua, W. algirica, W. sarda. In this revision we have described fourteen new species: W. longiseta, W. carpathica, W. kurta, W. parba, W. foslana, W. kumanskii, W. libohova, W. silva, W. gorba, W. kera, W. rona, W. sima, W. granada, W. telva

Krzysztof J. Cios

Introduction to deep neural networks and their history.

Tom Hess, Sivan Sabato

We define a new selection problem, \emph{Selecting with History}, which extends the secretary problem to a setting with historical information. We propose a strategy for this problem and calculate its success probability in the limit of a large sequence.

Eduardo Pastrana Buelvas, Diego Vera Piñeros

Pablo Alberto Bulcourf

Anton Daitche

The history force is one of the hydrodynamic forces which act on a particle moving through a fluid. It is an integral over the full time history of the particle's motion and significantly complicates the equations of motion (accordingly it is often neglected). We present here a study of the influence of this force on particles moving in a turbulent flow, for a wide range of particle parameters. It is shown that the magnitude of history force can be significant and that it can have a considerable effect on the particles' slip velocity, acceleration, preferential concentration and collision rate. We also investigate the parameter dependence of the strength of these effects.

Danor Aharon, Alessandra Mastrobuono Battisti, Hagai B. Perets

The tidal disruption of a star by a massive black hole (MBH) is thought to produce a transient luminous event. Such tidal disruption events (TDEs) may play an important role in the detection and characterization of MBHs and probe the properties and dynamics of their nuclear stellar clusters (NSCs) hosts. Previous studies estimated the recent rates of TDEs in the local universe. However, the long-term evolution of the rates throughout the history of the universe has been hardly explored. Here we consider the TDE history, using evolutionary models for the evolution of galactic nuclei. We use a 1D Fokker-Planck approach to explore the evolution of MBH-hosting NSCs, and obtain the disruption rates of stars during their evolution. We complement these with an analysis of TDEs history based on N-body simulation data, and find them to be comparable. We consider NSCs that are built-up from close-in star-formation (SF) or from SF/clusters-dispersal far-out, a few pc from the MBH. We also explore cases where primordial NSCs exist and later evolve through additional star-formation/cluster-dispersal processes. We study the dependence of the TDE history on the type of galaxy, as well as the dependence on the MBH mass. These provide several scenarios, with a continuous increase of the TDE rates over time for cases of far-out SF and a more complex behavior for the close-in SF cases. Finally, we integrate the TDE histories of the various scenarios to provide a total TDE history of the universe, which can be potentially probed with future large surveys (e.g. LSST).