{"results":[{"id":"doaj_10.3390/quat8040053","title":"Paleobiodiversity and Paleoecology Insights from a New MIS 5e Highstand Deposit on Santa Maria Island (Azores Archipelago, Portugal)","authors":[{"name":"Sergio Moreno"},{"name":"Mohamed Amine Doukani"},{"name":"Ana Hipólito"},{"name":"Patrícia Madeira"},{"name":"Sergio Pérez Pérez"},{"name":"Laura S. Dalmau"},{"name":"Gonçalo Castela Ávila"},{"name":"Luís Silva"},{"name":"Gustavo M. Martins"},{"name":"Esther Martín-González"},{"name":"Markes E. Johnson"},{"name":"Sérgio P. Ávila"}],"abstract":"During the last two decades, the Macaronesian archipelagos have been the focus of multiple studies targeting the abundant and diversified fossil record from late Neogene and Quaternary deposits. This record of past biota, ecosystems and climates is crucial for understanding the impact of glacial–interglacial cycles on Atlantic littoral marine organisms. Coupled with ongoing studies on the factors responsible for global climate change and associated sea-level variations, they contributed decisively towards the development of the modern marine island biogeography theory. Our current knowledge of the evolutionary and biogeographic history of the past and extant, shallow-water marine organisms from the Macaronesian geographic region relies on detailed analysis of many individual fossiliferous outcrops by means of quantitative and qualitative methodologies. Here, we focus on the fossil record of a newly studied MIS 5e outcrop at Pedra-que-pica (PQP), on Santa Maria Island (Azores Archipelago, Portugal). This multidisciplinary work integrates geology, paleontology and biology, providing the first detailed description of the sedimentary facies and stratigraphic framework of the PQP MIS 5e sequence that, coupled with the documentation of the biodiversity and ecological composition of PQP molluscan assemblages, allows us to produce a paleoecological reconstruction and to compare PQP with other last interglacial outcrops from Santa Maria Island. Our results increase the number of the Azorean MIS 5e marine molluscs to 140 taxa (116 Gastropoda and 24 Bivalvia). \u003ci\u003eErvilia castanea\u003c/i\u003e (Montagu, 1803) is the most abundant bivalve, while \u003ci\u003eBittium nanum\u003c/i\u003e (Mayer, 1864) and \u003ci\u003eMelarhaphe neritoides\u003c/i\u003e (Linnaeus, 1758) are the most abundant gastropod species. In addition, this work emphasizes the crucial importance of complementing quantitative collecting with qualitative surveys of the fossiliferous outcrops, because nearly 42% of the bivalve species and 28% of the gastropod taxa would be missed if only quantitative samples were used. Derivation of Hill numbers and rarefaction curves both indicate that the sampling effort should be increased at PQP. Thus, although Santa Maria Island is recognized by the scientific community as one of the best-studied islands regarding the last interglacial fossil record, this study emphasizes the need to continue with similar efforts in less known outcrops on the island.","source":"DOAJ","year":2025,"language":"","subjects":["Human evolution","Stratigraphy"],"doi":"10.3390/quat8040053","url":"https://www.mdpi.com/2571-550X/8/4/53","is_open_access":true,"published_at":"","score":69},{"id":"doaj_10.3390/ceramics8010020","title":"From Andalusia to the Atlantic During Early Globalization: Multidisciplinary Archaeometric Approach to Ceramic Production from Jerez de la Frontera (Spain)","authors":[{"name":"Saúl Guerrero Rivero"},{"name":"Javier G. Iñañez"},{"name":"Fernando Amores Carredano"},{"name":"Joana B. Torres"},{"name":"André Teixeira"},{"name":"Gorka Arana"},{"name":"José Luis Sánchez Zavala"}],"abstract":"The technological development of ceramic production during the early modern period in the Iberian Peninsula is a crucial topic in historical archaeological research. The present study analyzes pottery from Jerez de la Frontera, Andalusia, focusing on ceramic materials from the Convent of Santo Domingo (late 15th to early 17th centuries). Through the analysis of production wastes, including \u003ci\u003edolia\u003c/i\u003e and olive jars (\u003ci\u003ebotijas\u003c/i\u003e), this text unveils key aspects of regional ceramics practices. Using a multidisciplinary archaeometric approach, we applied petrography, X-ray diffraction (XRD), and inductively coupled plasma mass spectrometry (ICP-MS) to investigate compositional, technological, and provenance characteristics. The petrographic analysis identified clay matrix variability and mineral inclusions, indicating diverse raw material sources and production techniques. The XRD analysis confirmed key mineral phases that reflect controlled firing temperatures, while the ICP-MS analyses provided trace element profiles that were used to distinguish between local and non-local raw materials. Together, these results reveal technological shifts and resource diversity over time, challenging the assumption that Seville was the sole supplier of ceramics for Atlantic trade. This study establishes Jerez as a potential complementary production center, offering a new understanding of early globalization processes and ceramics manufacturing in southwestern Andalusia.","source":"DOAJ","year":2025,"language":"","subjects":["Technology","Chemical technology"],"doi":"10.3390/ceramics8010020","url":"https://www.mdpi.com/2571-6131/8/1/20","is_open_access":true,"published_at":"","score":69},{"id":"arxiv_2503.04313","title":"Episodes from the history of infinitesimals","authors":[{"name":"Mikhail G. Katz"}],"abstract":"Infinitesimals have seen ups and downs in their tumultuous history. In the 18th century, d'Alembert set the tone by describing infinitesimals as chimeras. Some adversaries of infinitesimals, including Moigno and Connes, picked up on the term. We highlight the work of Cauchy, Noël, Poisson and Riemann. We also chronicle reactions by Moigno, Lamarle and Cantor, and signal the start of a revival with Peano.","source":"arXiv","year":2025,"language":"en","subjects":["math.HO"],"doi":"10.1080/26375451.2025.2474811","url":"https://arxiv.org/abs/2503.04313","pdf_url":"https://arxiv.org/pdf/2503.04313","is_open_access":true,"published_at":"2025-03-06T10:58:17Z","score":69},{"id":"arxiv_2502.06764","title":"History-Guided Video Diffusion","authors":[{"name":"Kiwhan Song"},{"name":"Boyuan Chen"},{"name":"Max Simchowitz"},{"name":"Yilun Du"},{"name":"Russ Tedrake"},{"name":"Vincent Sitzmann"}],"abstract":"Classifier-free guidance (CFG) is a key technique for improving conditional generation in diffusion models, enabling more accurate control while enhancing sample quality. It is natural to extend this technique to video diffusion, which generates video conditioned on a variable number of context frames, collectively referred to as history. However, we find two key challenges to guiding with variable-length history: architectures that only support fixed-size conditioning, and the empirical observation that CFG-style history dropout performs poorly. To address this, we propose the Diffusion Forcing Transformer (DFoT), a video diffusion architecture and theoretically grounded training objective that jointly enable conditioning on a flexible number of history frames. We then introduce History Guidance, a family of guidance methods uniquely enabled by DFoT. We show that its simplest form, vanilla history guidance, already significantly improves video generation quality and temporal consistency. A more advanced method, history guidance across time and frequency further enhances motion dynamics, enables compositional generalization to out-of-distribution history, and can stably roll out extremely long videos. Project website: https://boyuan.space/history-guidance","source":"arXiv","year":2025,"language":"en","subjects":["cs.LG","cs.CV"],"url":"https://arxiv.org/abs/2502.06764","pdf_url":"https://arxiv.org/pdf/2502.06764","is_open_access":true,"published_at":"2025-02-10T18:44:25Z","score":69},{"id":"ss_4a8fb3d23a3be8a3129c8b26014d6f4143c3e0f3","title":"History of Neonatal Screening of Congenital Hypothyroidism in Portugal","authors":[{"name":"M. Costeira"},{"name":"Patrício Costa"},{"name":"Susana Roque"},{"name":"Ivone Carvalho"},{"name":"L. Vilarinho"},{"name":"J. Palha"}],"abstract":"Congenital hypothyroidism (CH) leads to growth and development delays and is preventable with early treatment. Neonatal screening for CH was initiated in Portugal in 1981. This study examines the history of CH screening in the country. Data were obtained from annual reports and from the national database of neonatal screening laboratory. The CH screening strategy primarily relies on the thyroid-stimulating hormone (TSH), followed by total thyroxine measurement as the second tier for confirmation. The TSH cutoff started at 90 mIU/L, decreasing to the actual 10 mIU/L. The coverage of the screening program has increased rapidly; although voluntary, it reached about 90% in 6 years and became universal in 10 years. Guideline and cutoff updates led to the identification of over 200 additional cases, resulting in specific retesting protocols for preterm and very-low-birth-weight babies. The actual decision tree considers CH when TSH levels are above 40 mIU/L. Data from the CH screening also provide an indication of the iodine status of the population, which is presently indicative of iodine insufficiency. The Portuguese neonatal screening for CH is a history of success. It has rapidly and continuously adapted to changes in knowledge and has become a universal voluntary practice within a few years.","source":"Semantic Scholar","year":2024,"language":"en","subjects":["Medicine"],"doi":"10.3390/ijns10010016","url":"https://www.semanticscholar.org/paper/4a8fb3d23a3be8a3129c8b26014d6f4143c3e0f3","is_open_access":true,"citations":6,"published_at":"","score":68.18},{"id":"arxiv_2403.06690","title":"From S-matrix theory to strings: Scattering data and the commitment to non-arbitrariness","authors":[{"name":"Robert van Leeuwen"}],"abstract":"The early history of string theory is marked by a shift from strong interaction physics to quantum gravity. The first string models and associated theoretical framework were formulated in the late 1960s and early 1970s in the context of the S-matrix program for the strong interactions. In the mid-1970s, the models were reinterpreted as a potential theory unifying the four fundamental forces. This paper provides a historical analysis of how string theory was developed out of S-matrix physics, aiming to clarify how modern string theory, as a theory detached from experimental data, grew out of an S-matrix program that was strongly dependent upon observable quantities. Surprisingly, the theoretical practice of physicists already turned away from experiment before string theory was recast as a potential unified quantum gravity theory. With the formulation of dual resonance models (the \"hadronic string theory\"), physicists were able to determine almost all of the models' parameters on the basis of theoretical reasoning. It was this commitment to \"non-arbitrariness\", i.e., a lack of free parameters in the theory, that initially drove string theorists away from experimental input, and not the practical inaccessibility of experimental data in the context of quantum gravity physics. This is an important observation when assessing the role of experimental data in string theory.","source":"arXiv","year":2024,"language":"en","subjects":["physics.hist-ph","gr-qc","hep-ph","hep-th"],"doi":"10.1016/j.shpsa.2023.12.011","url":"https://arxiv.org/abs/2403.06690","pdf_url":"https://arxiv.org/pdf/2403.06690","is_open_access":true,"published_at":"2024-03-11T13:05:08Z","score":68},{"id":"doaj_10.3390/rel14101247","title":"“If He Is Converted”: A New Spanish Featherwork \u003ci\u003eEcce Homo\u003c/i\u003e in Southeastern Africa","authors":[{"name":"Kate E. Holohan"}],"abstract":"In recent years, scholars have paid increasing attention to the material, spiritual, and collecting histories of both pre-invasion and colonial New Spanish (Mexican) featherworks. Rapidly and globally disseminated through religious and family networks, these objects traveled from Mexico to Spain, and other locations, before the end of the sixteenth century. This article explores the little-known history of a devotional featherwork \u003ci\u003eEcce Homo\u003c/i\u003e sent from Portugal to southeastern Africa in 1569. Originally a gift to Sebastian I of Portugal sent from the Spanish-colonized Americas, the \u003ci\u003eEcce Homo\u003c/i\u003e later entered the collection of Catherine of Austria, Sebastian’s grandmother. Catherine presented it to the Jesuits accompanying the Portuguese evangelizing and gold-seeking mission to Mutapa, a vast kingdom that encompassed parts of present-day Zimbabwe and Mozambique. Its intended recipient was the Mutapa emperor. However, this was not a gift meant to grease the wheels of diplomacy, nor was it designated as a tool for conversion: it was, instead, meant for the Mutapa emperor “se se convertese”—if he is converted. That is, it was conceived as a gift from one Catholic monarch to another, for use in personal devotion. The perceived spiritual efficacy of these feather images —themselves recently assimilated to Catholic Iberia from polytheistic Mesomerica—thus extended well beyond the transatlantic Iberian realms.","source":"DOAJ","year":2023,"language":"","subjects":["Religions. Mythology. Rationalism"],"doi":"10.3390/rel14101247","url":"https://www.mdpi.com/2077-1444/14/10/1247","is_open_access":true,"published_at":"","score":67},{"id":"arxiv_2306.17647","title":"A Brief History of Space VLBI","authors":[{"name":"Leonid I. Gurvits"}],"abstract":"Space Very Long Baseline Interferometry is a radio astronomy technique distinguished by a record-high angular resolution reaching single-digit microseconds of arc. The paper provides a brief account of the history of developments of this technique over the period 1960s-2020s.","source":"arXiv","year":2023,"language":"en","subjects":["astro-ph.IM"],"doi":"10.1109/HISTELCON56357.2023.10365962","url":"https://arxiv.org/abs/2306.17647","pdf_url":"https://arxiv.org/pdf/2306.17647","is_open_access":true,"published_at":"2023-06-30T13:34:32Z","score":67},{"id":"arxiv_2311.03428","title":"Note on episodes in the history of modeling measurements in local spacetime regions using QFT","authors":[{"name":"Doreen Fraser"},{"name":"Maria Papageorgiou"}],"abstract":"The formulation of a measurement theory for relativistic quantum field theory (QFT) has recently been an active area of research. In contrast to the asymptotic measurement framework that was enshrined in QED, the new proposals aim to supply a measurement framework for measurements in local spacetime regions. This paper surveys episodes in the history of quantum theory that contemporary researchers have identified as precursors to their own work and discusses how they laid the groundwork for current approaches to local measurement theory for QFT.","source":"arXiv","year":2023,"language":"en","subjects":["physics.hist-ph","quant-ph"],"url":"https://arxiv.org/abs/2311.03428","pdf_url":"https://arxiv.org/pdf/2311.03428","is_open_access":true,"published_at":"2023-11-06T18:22:06Z","score":67},{"id":"doaj_10.18441/ibam.22.2022.79.245-260","title":"América Latina en la historia del conocimiento y en la historia de la ciencia durante el largo siglo XIX","authors":[{"name":"Christiane Hoth de Olano"}],"abstract":"\nReseña\n","source":"DOAJ","year":2022,"language":"","subjects":["History of Portugal","History of Spain","Latin America. Spanish America","French literature - Italian literature - Spanish literature - Portuguese literature","Social Sciences"],"doi":"10.18441/ibam.22.2022.79.245-260","url":"https://journals.iai.spk-berlin.de/index.php/iberoamericana/article/view/2937","is_open_access":true,"published_at":"","score":66},{"id":"doaj_10.14195/2182-7974_34_2_3","title":"Entre a Idade Média e a Idade Moderna","authors":[{"name":"Fabiano Ferramosca"}],"abstract":"Qual o crescimento percentual entre o inicio do século XV e o inicio do século XVI no termo do Porto? Para responder a essa questão, o presente artigo contabiliza o número de contribuintes do Porto em duas fontes fiscais: o livro da abertura da rua nova (1438) e o livro da abertura da rua das flores (1521-1527). Temos por objetivo apresentar de forma quantitativa o crescimento populacional dos contribuintes que se deu no termo do Porto. Foram elaboradas tabelas comparativas das circunscrições com os valores populacionais nos dois períodos e respetivo crescimento percentual.","source":"DOAJ","year":2021,"language":"","subjects":["History of Portugal","History (General)"],"doi":"10.14195/2182-7974_34_2_3","url":"https://impactum-journals.uc.pt/boletimauc/article/view/10107","is_open_access":true,"published_at":"","score":65},{"id":"doaj_10.14195/0870-4147_52_18","title":"[Recensão a] Helena Osswald; Luís Carlos Amaral (Coordenação), Em torno do Património Cultural Religioso. Livro do XIV Encontro Cultural de São Cristóvão de Lafões, São Cristóvão de Lafões, Associação dos Amigos do Mosteiro de São Cristóvão de Lafões, 2021, 118 p., ISBN: 978-989-97817-9-5","authors":[{"name":"Inês Pinto"}],"abstract":"","source":"DOAJ","year":2021,"language":"","subjects":["History of Portugal","History (General)"],"doi":"10.14195/0870-4147_52_18","url":"https://impactum-journals.uc.pt/rph/article/view/9854","is_open_access":true,"published_at":"","score":65},{"id":"arxiv_2103.05280","title":"A Brief Historical Perspective on the Consistent Histories Interpretation of Quantum Mechanics","authors":[{"name":"Gustavo Rodrigues Rocha"},{"name":"Dean Rickles"},{"name":"Florian J. Boge"}],"abstract":"It will be presented in this chapter a historical account of the consistent histories interpretation of quantum mechanics based on primary and secondary literature. Firstly, the formalism of the consistent histories approach will be outlined.   Secondly, the works by Robert Griffiths and Roland Omnès will be discussed. Griffiths' seminal 1984 paper, the first physicist to have proposed a consistent-histories interpretation of quantum mechanics, followed by Omnès' 1990 paper, were instrumental to the consistent-histories model based on Boolean logic.   Thirdly, Murray Gell-Mann and James Hartle's steps to their own version of consistent-histories approach, motivated by a cosmological perspective, will then be described and evaluated. Gell-Mann and Hartle understood that spontaneous decoherence could path the way to a concrete physical model to Griffiths' consistent histories.   Moreover, the collective biography of these figures will be put in the context of the role played by the Santa Fe Institute, co-founded by Gell-Mann in 1984 in Santa Fe, New Mexico, where Hartle is also a member of the external faculty.","source":"arXiv","year":2021,"language":"en","subjects":["physics.hist-ph","quant-ph"],"url":"https://arxiv.org/abs/2103.05280","pdf_url":"https://arxiv.org/pdf/2103.05280","is_open_access":true,"published_at":"2021-03-09T08:09:08Z","score":65},{"id":"arxiv_2111.11860","title":"A Discrete-Time Compartmental Epidemiological Model for COVID-19 with a Case Study for Portugal","authors":[{"name":"Sandra Vaz"},{"name":"Delfim F. M. Torres"}],"abstract":"In [Ecological Complexity 44 (2020) Art. 100885, DOI: 10.1016/j.ecocom.2020.100885] a continuous-time compartmental mathematical model for the spread of the Coronavirus disease 2019 (COVID-19) is presented with Portugal as case study, from 2 March to 4 May 2020, and the local stability of the Disease Free Equilibrium (DFE) is analysed. Here, we propose an analogous discrete-time model and, using a suitable Lyapunov function, we prove the global stability of the DFE point. Using COVID-19 real data, we show, through numerical simulations, the consistence of the obtained theoretical results.","source":"arXiv","year":2021,"language":"en","subjects":["math.NA","physics.soc-ph","q-bio.PE"],"doi":"10.3390/axioms10040314","url":"https://arxiv.org/abs/2111.11860","pdf_url":"https://arxiv.org/pdf/2111.11860","is_open_access":true,"published_at":"2021-11-23T13:34:24Z","score":65},{"id":"ss_563e3583c5f146c8dbe368fadc2f86f1e20e4a88","title":"A concise history of Portugal","authors":[{"name":"D. Birmingham"}],"abstract":"","source":"Semantic Scholar","year":2018,"language":"en","subjects":["History"],"doi":"10.1017/9781108539951","url":"https://www.semanticscholar.org/paper/563e3583c5f146c8dbe368fadc2f86f1e20e4a88","is_open_access":true,"citations":85,"published_at":"","score":64.55},{"id":"doaj_https://doi.org/10.22355/exaequo.2020.42.10","title":"Architect Luz Valente-Pereira: Architecture, Research, and Life in a Changing Country","authors":[{"name":"Patrícia Santos Pedrosa"},{"name":"Lia Gil Antunes"}],"abstract":"Luz Valente-Pereira (b. 1934, Lisbon) is a key figure of the 20th century Portuguese History of Architecture, albeit a forgotten one. This research is a starting point for establishing a more solid biography of this pioneer who initiated the first decades of female participation in the architectural field in Portugal. After some professional experience in different contexts, she developed a stable research career at the National Laboratory of Civil Engineering (LNEC) with studies on various spatial scales. We have used different methodologies: bibliographical review, consultation of national archives, and an interview with her. Our proposal is not only to create female references but also to broaden the historical readings on women’s participation in Portugal throughout the 20th century.","source":"DOAJ","year":2020,"language":"","subjects":["Women. Feminism"],"doi":"https://doi.org/10.22355/exaequo.2020.42.10","url":"https://exaequo.apem-estudos.org/artigo/architect-luz-valente-pereira","is_open_access":true,"published_at":"","score":64},{"id":"doaj_10.52165/sgj.12.3.227-228","title":"EDITORIAL","authors":[{"name":"Ivan Čuk"}],"abstract":"\nDear friends,\nThese days our lives are run by COVID-19. Our gymnastic family mourns Dieter Hoffman, an excellent German coach and expert, a FIG Academy lecturer, who recently died of Covid-19. We do not know what comesnext but I am certain we all want to go back to our normal life. \nDespite many negative effects of Covid–19, it had a positive effect on our journal. Our authors wrote as many as16 articles for this issue which is a record for the journal. \nWe are all adjusting to new circumstances. As you probably already know, conferences will be held online. Bulgaria will host a symposium on rhythmic gymnastics and Portugal on gymnastics. For more detailed information please see the following pages. Please join the symposia and take an active part with your ideas and views!\nFor this issue our authors researched many different topics, including biomechanics, motor control, motor learning, theory of training, physiology, psychology, physical education, sociology and history, in relation to rhythmic and artistic gymnastics and trampolining.\nCountries participating with articles include: USA, Slovakia, Tunisia, Germany, Brazil, Australia, Portugal, Slovenia, Spain, Turkey, Greece, Iran and Ukraine.\nAntonGajdoš provides a short historical note on Nina Bocharova, the Olympic Champion from Russia in WAG at the Olympics 1952 in Helsinki.\nOur editorial board decided to make an exception and publish a letter –manifesto of International Socio-Cultural research group on WAG lead by Natalie Barker-Ruchti (USA)to the Editorand a comment on the letter by William Sands (USA). While we believe the letter and the comment present issues that may be important to our audiences, I’d like to stress that our journal remains focused on the publication of scientific articles presenting evidence-based solutions only. Nevertheless, there should be no doubt that our journal supports the United Nations Declaration of Human and Children Rights and believes its provisions should be respected.\nJust to remind you, if you quote the Journal,its abbreviation on the Web of Knowledge is SCI GYMN J.\nI wish you pleasant reading and a lot of inspiration for new research projects and articles,\nIvan Čuk, Editor-in-Chief \n","source":"DOAJ","year":2020,"language":"","subjects":["Sports"],"doi":"10.52165/sgj.12.3.227-228","url":"https://journals.uni-lj.si/sgj/article/view/11747","is_open_access":true,"published_at":"","score":64},{"id":"arxiv_2009.02331","title":"History entanglement entropy","authors":[{"name":"Leonardo Castellani"}],"abstract":"A formalism is proposed to describe entangled quantum histories, and their entanglement entropy. We define a history vector, living in a tensor space with basis elements corresponding to the allowed histories, i.e. histories with nonvanishing amplitudes. The amplitudes are the components of the history vector, and contain the dynamical information. Probabilities of measurement sequences, and resulting collapse, are given by generalized Born rules: they are all expressed by means of projections and scalar products involving the history vector. Entangled history states are introduced, and a history density matrix is defined in terms of ensembles of history vectors. The corresponding history entropies (and history entanglement entropies for composite systems) are explicitly computed in two examples taken from quantum computation circuits.","source":"arXiv","year":2020,"language":"en","subjects":["quant-ph","hep-th","physics.hist-ph"],"url":"https://arxiv.org/abs/2009.02331","pdf_url":"https://arxiv.org/pdf/2009.02331","is_open_access":true,"published_at":"2020-09-04T18:00:01Z","score":64},{"id":"arxiv_2004.01484","title":"The B. B. Newman Spelling Theorem","authors":[{"name":"Carl-Fredrik Nyberg-Brodda"}],"abstract":"This article aims to be a self-contained account of the history of the B. B. Newman Spelling Theorem, including the historical context in which it arose. First, an account of B. B. Newman and how he came to prove his Spelling Theorem is given, together with a description of the author's efforts to track this information down. Following this, a high-level description of combinatorial group theory is given. This is then tied in with a description of the history of the word problem, a fundamental problem in the area. After a description of some of the theory of one-relator groups, an important part of combinatorial group theory, the natural division line into the torsion and torsion-free case for such groups is described. This culminates in a statement of and general discussion about the B. B. Newman Spelling Theorem and its importance.","source":"arXiv","year":2020,"language":"en","subjects":["math.HO","math.GR"],"url":"https://arxiv.org/abs/2004.01484","pdf_url":"https://arxiv.org/pdf/2004.01484","is_open_access":true,"published_at":"2020-04-03T11:46:01Z","score":64},{"id":"arxiv_2012.00753","title":"José Monteiro da Rocha (1734-1819) and his work of 1782 on the determination of comet orbits","authors":[{"name":"Fernando B. Figueiredo"},{"name":"João M. Fernandes"}],"abstract":"In 1782 José Monteiro da Rocha, astronomer and professor of the University of Coimbra, presented in a public session of the Royal Academy of Sciences of Lisbon a memoir on the problem of the determination of the comets' orbits. Only in 1799, the \"Determinação das Orbitas dos Cometas\" (Determination of the orbits of comets) would be published in the Academy's memoires. In that work, Monteiro da Rocha presents a method for solving the problem of the determination of the parabolic orbit of a comet from three observations. Monteiro da Rocha's method is essentially the same method proposed by Olbers and published under von Zach's sponsorship two years before, in 1797. To have been written and published in Portuguese was certainly a hindrance for its dissemination among the international astronomical community. In this article, we intend to present Monteiro da Rocha's method and trying to see to what extent Gomes Teixeira's assertion (Teixeira 1934) that Monteiro da Rocha and Olbers must figure together in the history of astronomy, as the first inventors of a practical and easy method for the determination of parabolic orbits of comets, is justified.","source":"arXiv","year":2020,"language":"en","subjects":["physics.hist-ph","astro-ph.EP"],"doi":"10.1177/0021828620947844","url":"https://arxiv.org/abs/2012.00753","pdf_url":"https://arxiv.org/pdf/2012.00753","is_open_access":true,"published_at":"2020-12-01T15:41:59Z","score":64}],"total":2152320,"page":1,"page_size":20,"sources":["CrossRef","DOAJ","arXiv","Semantic Scholar"],"query":"History of Portugal"}