GRHCT - Grup de Recerca d'Història de la Ciència i de la Tècnica
http://hdl.handle.net/2117/3789
2019-09-18T20:30:07ZProgressive freeze concentration of skim milk in an agitated vessel: effect of the coolant temperature and stirring rate on the process performance
http://hdl.handle.net/2117/130228
Progressive freeze concentration of skim milk in an agitated vessel: effect of the coolant temperature and stirring rate on the process performance
De Bona, Isabella; Rubio, Ariadna; Blanco Abellán, Mónica; Raventós Santamaria, Mercè; Hernández Yáñez, Eduard; Schwinden, Elane
The aim of this study was to investigate the freeze-concentration of skimmed milk by a progressive freeze concentration process. The progressive freeze concentration procedure was performed at three different temperatures (5, 10, and 15 C) and stirring rates (0, 500, and 1000 r/min).
2019-03-12T10:22:37ZDe Bona, IsabellaRubio, AriadnaBlanco Abellán, MónicaRaventós Santamaria, MercèHernández Yáñez, EduardSchwinden, ElaneThe aim of this study was to investigate the freeze-concentration of skimmed milk by a progressive freeze concentration process. The progressive freeze concentration procedure was performed at three different temperatures (5, 10, and 15 C) and stirring rates (0, 500, and 1000 r/min).Leonhard Euler (1707-1783): el mestre de tots nosaltres
http://hdl.handle.net/2117/129021
Leonhard Euler (1707-1783): el mestre de tots nosaltres
Massa Esteve, Maria Rosa
2019-02-13T10:31:40ZMassa Esteve, Maria RosaLa matemática pura en los cursos militares de matemáticas de Pedro Lucuce (1739-44) y de Pedro Padilla (1753-56)
http://hdl.handle.net/2117/126796
La matemática pura en los cursos militares de matemáticas de Pedro Lucuce (1739-44) y de Pedro Padilla (1753-56)
Blanco Abellán, Mónica; Massa Esteve, Maria Rosa
2019-01-15T11:37:37ZBlanco Abellán, MónicaMassa Esteve, Maria RosaThe circulation of scientific knowledge in Euler's first stage at Saint Petersburg Academy of Sciences
http://hdl.handle.net/2117/123911
The circulation of scientific knowledge in Euler's first stage at Saint Petersburg Academy of Sciences
Massa Esteve, Maria Rosa
2018-11-12T09:20:45ZMassa Esteve, Maria RosaInfluence of severe plastic deformation in phase transformation of superduplex stainless steels
http://hdl.handle.net/2117/123811
Influence of severe plastic deformation in phase transformation of superduplex stainless steels
Llorca Isern, Núria; Biserova Tahchieva, Alisiya; López Jiménez, Isabel; Calliari, Irene; Cabrera Marrero, José M.; Roca, Antoni
Duplex and superduplex stainless steels are characterised by high corrosion resistance and high mechanical strength. However, these steels can suffer formation of secondary brittle phases when they reach temperatures between 600 and 950 °C, which can lead to the catastrophic service failure of components. In order to understand the influence of the mechanical history of the steel part, equal-channel angular pressing was applied followed by different thermal treatments. Microstructural characterisation was carried out on the ECAPed samples before and after thermal treatment. The analysis of the hardness evolution of the same samples was also evaluated.
2018-11-09T09:32:31ZLlorca Isern, NúriaBiserova Tahchieva, AlisiyaLópez Jiménez, IsabelCalliari, IreneCabrera Marrero, José M.Roca, AntoniDuplex and superduplex stainless steels are characterised by high corrosion resistance and high mechanical strength. However, these steels can suffer formation of secondary brittle phases when they reach temperatures between 600 and 950 °C, which can lead to the catastrophic service failure of components. In order to understand the influence of the mechanical history of the steel part, equal-channel angular pressing was applied followed by different thermal treatments. Microstructural characterisation was carried out on the ECAPed samples before and after thermal treatment. The analysis of the hardness evolution of the same samples was also evaluated.Comentaris sobre "Analyse des infiniment petits" de l’Hospital (1696-1768): interpretació i ensenyament de conceptes fonamentals del càlcul diferencial
http://hdl.handle.net/2117/123145
Comentaris sobre "Analyse des infiniment petits" de l’Hospital (1696-1768): interpretació i ensenyament de conceptes fonamentals del càlcul diferencial
Blanco Abellán, Mónica
In 1696 the Marquis de L’Hospital (1661-1704) published the ‘Analyse des infiniment petits’ pour l’intelligence des lignes courbes, the first systematic work on differential calculus. The ‘Analyse’ played a fundamental role in the circulation and teaching of the Leibnizian calculus. To help readers understand the ‘Analyse’ three commentaries were subsequently published in France: i) ‘Éclaircissemens sur l’Analyse des infiniment petits’ (Paris, 1725), by Pierre Varignon (1654-1722); ii) ‘Commentaire sur l’Analyse des infiniment petits’ (Paris, 1721), by Jean Pierre Crousaz (1663-1750); iii) ‘Analyse des infiniment petits, suivie d’un nouveau commentaire pour l’intelligence des endroits les plus difficiles de cet ouvrage’ (Avignon, 1768), by Aimé Henri Paulian (1722-1802). The main aim of this contribution is to show how the authors of these commentaries interpreted and explained some fundamental concepts contained in the ‘Analyse’, such as the definition of difference and the rule of the product
2018-10-29T12:29:31ZBlanco Abellán, MónicaIn 1696 the Marquis de L’Hospital (1661-1704) published the ‘Analyse des infiniment petits’ pour l’intelligence des lignes courbes, the first systematic work on differential calculus. The ‘Analyse’ played a fundamental role in the circulation and teaching of the Leibnizian calculus. To help readers understand the ‘Analyse’ three commentaries were subsequently published in France: i) ‘Éclaircissemens sur l’Analyse des infiniment petits’ (Paris, 1725), by Pierre Varignon (1654-1722); ii) ‘Commentaire sur l’Analyse des infiniment petits’ (Paris, 1721), by Jean Pierre Crousaz (1663-1750); iii) ‘Analyse des infiniment petits, suivie d’un nouveau commentaire pour l’intelligence des endroits les plus difficiles de cet ouvrage’ (Avignon, 1768), by Aimé Henri Paulian (1722-1802). The main aim of this contribution is to show how the authors of these commentaries interpreted and explained some fundamental concepts contained in the ‘Analyse’, such as the definition of difference and the rule of the productLa correspondencia entre Leibniz y el marqués de l’Hospital: sobre la envolvente de una familia de curvas
http://hdl.handle.net/2117/123142
La correspondencia entre Leibniz y el marqués de l’Hospital: sobre la envolvente de una familia de curvas
Blanco Abellán, Mónica
2018-10-29T12:10:42ZBlanco Abellán, MónicaThe harmonic triangle in Mengoli 's and Leibniz's works
http://hdl.handle.net/2117/121858
The harmonic triangle in Mengoli 's and Leibniz's works
Massa Esteve, Maria Rosa
The harmonic triangle was defined by Gottfried Wilhelm Leibniz (1646- 1716) in 1673, and its definition was related to the successive differences of the harmonic series. Leibniz studied it in many different texts throughout his life. Pietro Mengoli (1627-1686), rather at the same time, used the harmonic triangle as a triangular table to perform quadratures and also the interpola - ted harmonic triangle to calculate the quadrature of the circle. In this article we analyze and compare the independent treatment of harmonic triangle by Mengoli and Leibniz in their works, referring to their sources, their aims, and their uses. We show that, on the one hand, Mengoli uses triangular tables as a tool of calculus, and uses the harmonic triangle to perform quadratures through one procedure called by him “homology”. On the other hand, at the same time, Leibniz defines the harmonic triangle from the study on harmonic series, analyses its properties, and uses it to perform the summations of infi - nite series through one procedure called by him “sums of all the differences”. Harmonic triangle has an open visual structure in which the number of terms arranged in this way can be made infinite. The infinite therefore becomes one more element in the mathematical calculations of these authors, which in seventeenth century mathematics opened up a world of possibilities in the series and in their relations with infinitesimal calculus
2018-10-03T12:01:26ZMassa Esteve, Maria RosaThe harmonic triangle was defined by Gottfried Wilhelm Leibniz (1646- 1716) in 1673, and its definition was related to the successive differences of the harmonic series. Leibniz studied it in many different texts throughout his life. Pietro Mengoli (1627-1686), rather at the same time, used the harmonic triangle as a triangular table to perform quadratures and also the interpola - ted harmonic triangle to calculate the quadrature of the circle. In this article we analyze and compare the independent treatment of harmonic triangle by Mengoli and Leibniz in their works, referring to their sources, their aims, and their uses. We show that, on the one hand, Mengoli uses triangular tables as a tool of calculus, and uses the harmonic triangle to perform quadratures through one procedure called by him “homology”. On the other hand, at the same time, Leibniz defines the harmonic triangle from the study on harmonic series, analyses its properties, and uses it to perform the summations of infi - nite series through one procedure called by him “sums of all the differences”. Harmonic triangle has an open visual structure in which the number of terms arranged in this way can be made infinite. The infinite therefore becomes one more element in the mathematical calculations of these authors, which in seventeenth century mathematics opened up a world of possibilities in the series and in their relations with infinitesimal calculusThe main sources for the Arte Mayor in sixteenth century Spain
http://hdl.handle.net/2117/119919
The main sources for the Arte Mayor in sixteenth century Spain
Massa Esteve, Maria Rosa; Romero Vallhonesta, Fàtima
One of the main changes in European Renaissance mathematics was the progressive development of algebra from practical arithmetic, in which equations and operations began to be written with abbreviations and symbols rather than in the rethorical way found in earlier arithmetical texts. In Spain, the introduction of algebraic procedures was mainly achieved through certain commercial or arithmetical texts, in which a section was devoted to algebra or the
2018-07-25T09:18:10ZMassa Esteve, Maria RosaRomero Vallhonesta, FàtimaOne of the main changes in European Renaissance mathematics was the progressive development of algebra from practical arithmetic, in which equations and operations began to be written with abbreviations and symbols rather than in the rethorical way found in earlier arithmetical texts. In Spain, the introduction of algebraic procedures was mainly achieved through certain commercial or arithmetical texts, in which a section was devoted to algebra or theTeaching engineers in the seventeenth century: european influences in Portugal
http://hdl.handle.net/2117/119021
Teaching engineers in the seventeenth century: european influences in Portugal
Fialho Conde, Antónia; Massa Esteve, Maria Rosa
The practice of mathematics underwent a major transformation in the seventeenth century due to new procedures and concepts that also showed their utility for military architecture. The circulation of this knowledge can be found in several works. In this paper, we focus on an early work on Portuguese fortifications, Methodo Lusitanico de Desenhar as Fortificaçoens das Praças Regulares & Irregulares (Lusitanic Method of Drawing Fortifications of Regular and Irregular Military Posts), published posthumously in 1680, the author of which was the leading Portuguese Chief Cosmographer and Chief Engineer, Luis Serrão Pimentel (1613–1679). Methodo Lusitanico was a novel work containing the author’s own theoretical explorations of the art and science of fortification in Portugal arising from the theoretical investigations and military education sponsored by the Portuguese Crown. The aim of our contribution is to show the European influences on Portuguese science in the seventeenth century through the analysis of an early work on modern fortifications written in the Portuguese language and by a Portuguese scholar. As far as the contents of the book are concerned, we show that Serrão Pimentel analyzes and reviews the published methods of fortification, and modifies them by introducing new procedures to improve the use of mathematics in the teaching of engineers. Our analysis also shows that Serrão Pimentel was a leading mathematician and a skillful teacher who had read the main mathematical works published at his time, such as Stevin’s decimal arithmetic, and used them in practice.
2018-07-06T07:16:03ZFialho Conde, AntóniaMassa Esteve, Maria RosaThe practice of mathematics underwent a major transformation in the seventeenth century due to new procedures and concepts that also showed their utility for military architecture. The circulation of this knowledge can be found in several works. In this paper, we focus on an early work on Portuguese fortifications, Methodo Lusitanico de Desenhar as Fortificaçoens das Praças Regulares & Irregulares (Lusitanic Method of Drawing Fortifications of Regular and Irregular Military Posts), published posthumously in 1680, the author of which was the leading Portuguese Chief Cosmographer and Chief Engineer, Luis Serrão Pimentel (1613–1679). Methodo Lusitanico was a novel work containing the author’s own theoretical explorations of the art and science of fortification in Portugal arising from the theoretical investigations and military education sponsored by the Portuguese Crown. The aim of our contribution is to show the European influences on Portuguese science in the seventeenth century through the analysis of an early work on modern fortifications written in the Portuguese language and by a Portuguese scholar. As far as the contents of the book are concerned, we show that Serrão Pimentel analyzes and reviews the published methods of fortification, and modifies them by introducing new procedures to improve the use of mathematics in the teaching of engineers. Our analysis also shows that Serrão Pimentel was a leading mathematician and a skillful teacher who had read the main mathematical works published at his time, such as Stevin’s decimal arithmetic, and used them in practice.