Hasil untuk "History of Portugal"

Natalia Taccetta

Introducción al dossier.

Pascal Marquet, Max Planck

This is an English (annotated) translation of the German paper by Max Planck (1943) about "The history of the discovery of the physical quantum of action"

Lukáš Likavčan

SETI is not a usual point of departure for environmental humanities. However, this paper argues that theories originating in this field have direct implications for how we think about viable inhabitation of the Earth. To demonstrate SETI's impact on environmental humanities, this paper introduces Fermi paradox as a speculative tool to probe possible trajectories of planetary history, and especially the "Sustainability Solution" proposed by Jacob Haqq-Misra and Seth Baum. This solution suggests that sustainable coupling between extraterrestrial intelligences and their planetary environments is the major factor in the possibility of their successful detection by remote observation. By positing that exponential growth is not a sustainable development pattern, this solution rules out space-faring civilizations colonizing solar systems or galaxies. This paper elaborates on Haqq-Misra's and Baum's arguments, and discusses speculative implications of the Sustainability Solution, thus rethinking three concepts in environmental humanities: technosphere, planetary history, and sustainability. The paper advocates that (1) technosphere is a transitory layer that shall fold back into biosphere; (2) planetary history must be understood in a generic perspective that abstracts from terrestrial particularities; and (3) sustainability is not sufficient vector of viable human inhabitation of the Earth, suggesting instead habitability and genesity as better candidates.

Riccardo Domenichini

It is difficult to fix coordinates to define architectural archives, related as they are to a discipline that has many declensions and often overlaps with others. Characterized by a multiplicity of types of documentation, from the point of view of production and organization they vary greatly in the range defined by the two poles of personal and corporate archives. Subjected to a strong evolutionary process, marked by the increasingly exclusive presence of digital technology, they constitute a field of continuous learning for archivists and researchers, with the aim of fully exploiting their information potential. Historical research, however, is only one of the fields in which architectural archives can play a primary role. Focusing on the human environment, built and natural, they are vital in the construction and development of collective memory, as much as in the management and protection of the works that make up the common heritage of citizens.

Filipa Coimbra

This article aims to situate the importance of the archive in the decolonization of museums and their collections through technological, discursive and museological perspectives. Taking the Modern Art Centre (CAM) collection of the Calouste Gulbenkian Foundation (FCG, Lisbon) as a case-study and Gulbenkian archives as a resource, the development of CAM’s collection during the final stage of the Portuguese colonial empire will be examined. To this end, I draw on unpublished data about the acquisition of two sets of artworks acquired in Mozambique and Angola by then Foundation's chairman, José de Azeredo Perdigão (1896-1993). These acquisitions occurred in the context of his official journey to these two African territories in 1963, which were under Portuguese colonial rule at the time. I will analyse the collecting processes of these artworks, by questioning their absence from the collection, institutional narrative and exhibitions. In the context of the collection's and the institution's histories, issues such as the autonomy and neutrality of the FCG vis-à-vis the Portuguese dictatorship (and its colonial policy) will also be under review. In this way and framed in the recent focus on collections and the responsibility of museums in recognizing persistent historical omissions, I will seek to highlight a poorly known (and problematic) period in the history of one of the most important modern and contemporary art collections in Portugal, in contrast with the period after its musealization, in 1983.

Helen Au-Yang, Jacques H. H. Perk

We present our personal histories with Michael Fisher. We describe how each one of us first came to Cornell University. We also discuss our many subsequent interactions and successful collaborations with him on various physics projects.

Teresa Pinheiro

Introdução ao dossier

Elena Varela-Álvarez, Patrick G. Meirmans, Michael D. Guiry et al.

The genus Porphyra sensu lato (Bangiaceae, Rhodophyta), an important seaweed grown in aquaculture, is the most genetically diverse group of the Class Bangiophyceae, but has poorly understood genetic variability linked to complex evolutionary processes. Genetic studies in the last decades have largely focused on resolving gene phylogenies; however, there is little information on historical population biogeography, structure and gene flow in the Bangiaceae, probably due to their cryptic nature, chimerism and polyploidy, which render analyses challenging. This study aims to understand biogeographic population structure in the two abundant Porphyra species in the Northeast Atlantic: Porphyra dioica (a dioecious annual) and Porphyra linearis (protandrous hermaphroditic winter annual), occupying distinct niches (seasonality and position on the shore). Here, we present a large-scale biogeographic genetic analysis across their distribution in the Northeast Atlantic, using 10 microsatellites and cpDNA as genetic markers and integrating chimerism and polyploidy, including simulations considering alleles derived from different ploidy levels and/or from different genotypes within the chimeric blade. For P. linearis, both markers revealed strong genetic differentiation of north-central eastern Atlantic populations (from Iceland to the Basque region of Northeast Iberia) vs. southern populations (Galicia in Northwest Iberia, and Portugal), with higher genetic diversity in the south vs. a northern homogenous low diversity. For. P. dioica, microsatellite analyses also revealed two genetic regions, but with weaker differentiation, and cpDNA revealed little structure with all the haplotypes mixed across its distribution. The southern cluster in P. linearis also included introgressed individuals with cpDNA from P. dioica and a winter form of P. dioica occurred spatially intermixed with P. linearis. This third entity had a similar morphology and seasonality as P. linearis but genomes (either nuclear or chloroplast) from P. dioica. We hypothesize a northward colonization from southern Europe (where the ancestral populations reside and host most of the gene pool of these species). In P. linearis recently established populations colonized the north resulting in homogeneous low diversity, whereas for P. dioica the signature of this colonization is not as obvious due to hypothetical higher gene flow among populations, possibly linked to its reproductive biology and annual life history.

Ana Martins, Manuel Scotto, Ricardo Deus et al.

Although regulatory improvements for air quality in the European Union have been made, air pollution is still a pressing problem and, its impact on health, both mortality and morbidity, is a topic of intense research nowadays. The main goal of this work is to assess the impact of the exposure to air pollutants on the number of daily hospital admissions due to respiratory causes in 58 spatial locations of Portugal mainland, during the period 2005-2017. To this end, INteger Generalised AutoRegressive Conditional Heteroskedastic (INGARCH)-based models are extensively used. This family of models has proven to be very useful in the analysis of serially dependent count data. Such models include information on the past history of the time series, as well as the effect of external covariates. In particular, daily hospitalisation counts, air quality and temperature data are endowed within INGARCH models of optimal orders, where the automatic inclusion of the most significant covariates is carried out through a new block-forward procedure. The INGARCH approach is adequate to model the outcome variable (respiratory hospital admissions) and the covariates, which advocates for the use of count time series approaches in this setting. Results show that the past history of the count process carries very relevant information and that temperature is the most determinant covariate, among the analysed, for daily hospital respiratory admissions. It is important to stress that, despite the small variability explained by air quality, all models include on average, approximately two air pollutants covariates besides temperature. Further analysis shows that the one-step-ahead forecasts distributions are well separated into two clusters: one cluster includes locations exclusively in the Lisbon area (exhibiting higher number of one-step-ahead hospital admissions forecasts), while the other contains the remaining locations. This results highlights that special attention must be given to air quality in Lisbon metropolitan area in order to decrease the number of hospital admissions.

I. Belyaev, G. Carboni, N. Harnew et al.

In this paper we describe the history of the LHCb experiment over the last three decades, and its remarkable successes and achievements. LHCb was conceived primarily as a b-physics experiment, dedicated to CP violation studies and measurements of very rare b decays, however the tremendous potential for c-physics was also clear. At first data taking, the versatility of the experiment as a general-purpose detector in the forward region also became evident, with measurements achievable such as electroweak physics, jets and new particle searches in open states. These were facilitated by the excellent capability of the detector to identify muons and to reconstruct decay vertices close to the primary pp interaction region. By the end of the LHC Run 2 in 2018, before the accelerator paused for its second long shut down, LHCb had measured the CKM quark mixing matrix elements and CP violation parameters to world-leading precision in the heavy-quark systems. The experiment had also measured many rare decays of b and c quark mesons and baryons to below their Standard Model expectations, some down to branching ratios of order 10-9. In addition, world knowledge of b and c spectroscopy had improved significantly through discoveries of many new resonances already anticipated in the quark model, and also adding new exotic four and five quark states.

Hisashi Hayakawa, Yusuke Ebihara

This section shows an overview of a recent development of the studies on great space weather events in history. Its discussion starts from the Carrington event and compare its intensity with the extreme storms within the coverage of the regular magnetic measurements. Extending its analyses back beyond their onset, this section shows several case studies of extreme storms with sunspot records in the telescopic observations and candidate auroral records in historical records. Before the onset of telescopic observations, this section shows the chronological coverages of the records of unaided-eye sunspot and candidate aurorae and several case studies on their basis.

Arthur Genthon

Interest in Brownian motion was shared by different communities: this phenomenon was first observed by the botanist Robert Brown in 1827, then theorised by physicists in the 1900s, and eventually modelled by mathematicians from the 1920s, while still evolving as a physical theory. Consequently, Brownian motion now refers to the natural phenomenon but also to the theories accounting for it. There is no published work telling its entire history from its discovery until today, but rather partial histories either from 1827 to Perrin's experiments in the late 1900s, from a physicist's point of view; or from the 1920s from a mathematician's point of view. In this article, we tackle the period straddling the two `half-histories' just mentioned, in order to highlight continuity, to investigate the domain-shift from physics to mathematics, and to survey the enhancements of later physical theories. We study the works of Einstein, Smoluchowski, Langevin, Wiener, Ornstein and Uhlenbeck from 1905 to 1934 as well as experimental results, using the concept of Brownian velocity as a leading thread. We show how Brownian motion became a research topic for the mathematician Wiener in the 1920s, why his model was an idealization of physical experiments, what Ornstein and Uhlenbeck added to Einstein's results, and how Wiener, Ornstein and Uhlenbeck developed in parallel contradictory theories concerning Brownian velocity.

Anita Pereira Tavares

Este artigo tem como objetivo dar a conhecer ao público dois tombos de medição e demarcação de bens e propriedades do mosteiro de Santa Maria de Arouca, do século XVIII, localizados na terra de Cambra. Através das escrituras que encontramos nos tombos podemos conhecer alguns bens que o mosteiro de Arouca possuía e recolher dados toponímicos, económicos (produção agrícola, gado e seus derivados), ou ainda medidas de capacidade e moeda em uso na época.

Rob S. A. van Bemmelen, Rob S. A. van Bemmelen, Yann Kolbeinsson et al.

Non-breeding movement strategies of migratory birds may be expected to be flexibly adjusted to the distribution and quality of habitat, but few studies compare movement strategies among populations using distinct migration routes and wintering areas. In our study, individual movement strategies of red-necked phalaropes (Phalaropus lobatus), a long-distance migratory wader which uses saline waters in the non-breeding period, were studied using light-level geolocators. Results revealed a migratory divide between two populations with distinct migration routes and wintering areas: one breeding in the north-eastern North Atlantic and migrating ca. 10,000 km oversea to the tropical eastern Pacific Ocean, and the other breeding in Fennoscandia and Russia migrating ca. 6,000 km—largely over land—to the Arabian Sea (Indian Ocean). In line with our expectations, the transoceanic migration between the North Atlantic and the Pacific was associated with proportionately longer wings, a more even spread of stopovers in autumn and a higher migration speed in spring compared to the migration between Fennoscandian-Russian breeding grounds and the Arabian Sea. In the wintering period, birds wintering in the Pacific were stationary in roughly a single area, whereas individuals wintering in the Arabian Sea moved extensively between different areas, reflecting differences in spatio-temporal variation in primary productivity between the two wintering areas. Our study is unique in showing how habitat distribution shapes movement strategies over the entire non-breeding period within a species.

S. Seabra, I. Fragata, M. Antunes et al.

Maria de Jesus DURAN KREMER

The project of drawing up an inventory of Roman mosaics in the territory of present-day Portugal requires, in the first stage, a methodical consultation of as many existing sources of information as possible, both of the current and of the past centuries. In doing so, trends in the compositional grammar and in the iconographic discourse chosen will gradually be outlined, eventually allowing the individualization of local, regional or even itinerant workshops. In the process of consulting the records of Roman mosaics in Portuguese territory of Lusitania we can identify the existence of geometric mosaics in Roman villae of Alentejo, less known but not less interesting as regards the repertoire of their floors. From some of them - disappeared in the years following their discovery – there is nothing left but the reports of the archaeological campaigns then carried out and one or another photograph or drawing included in them. Largely in very poor state of conservation, the still existing fragments are, today, testimony of a very own decorative syntax.

Renato Portugal

The element distinctness problem is the problem of determining whether the elements of a list are distinct, that is, if $x=(x_1,...,x_N)$ is a list with $N$ elements, we ask whether the elements of $x$ are distinct or not. The solution in a classical computer requires $N$ queries because it uses sorting to check whether there are equal elements. In the quantum case, it is possible to solve the problem in $O(N^{2/3})$ queries. There is an extension which asks whether there are $k$ colliding elements, known as element $k$-distinctness problem. This work obtains optimal values of two critical parameters of Ambainis' seminal quantum algorithm [SIAM J.~Comput., 37, 210-239, 2007]. The first critical parameter is the number of repetitions of the algorithm's main block, which inverts the phase of the marked elements and calls a subroutine. The second parameter is the number of quantum walk steps interlaced by oracle queries. We show that, when the optimal values of the parameters are used, the algorithm's success probability is $1-O(N^{1/(k+1)})$, quickly approaching 1. The specification of the exact running time and success probability is important in practical applications of this algorithm.

Luciano Maiani, Luisa Bonolis

The object of this interview is the history of the Large Hadron Collider in the LEP tunnel at CERN, from first ideas to the discovery of the Brout-Englert-Higgs boson, seen from the point of view of a member of CERN scientific committees, of the CERN Council and a former Director General of CERN in the years of machine construction

Luís Silva, João Leal

Yanina Welp