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Letteratura scientifica selezionata sul tema "Pécule"

Autore: Grafiati

Pubblicato: 29 luglio 2024

Ultima modifica: 10 luglio 2025

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Articoli di riviste sul tema "Pécule"

1

Novkirishka-Stoyanova, Malina. "Le pécule romain et l’origine de la responsabilite limitée en droit romain." Studia Universitatis Babeş-Bolyai Iurisprudentia 65, no. 4 (2021): 672–725. http://dx.doi.org/10.24193/subbiur.65(2020).4.20.

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The study is a part of one deeper study on the Roman Law about the slaves and personae alieni iuris presented in its evolution. The accent is mainly on the emergence of the limited liability of the pater familias/ dominus in the case of contracts with pecuniary property. It is a study for the place of the actio de peculio among the other actiones adjectitiae qualitatis, the notion of the merx pexuliaris and the concessio particulii.

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2

Bénézech, Michel, and Jean-René Bernadet. "L’argent des aliénés : pécule et monnaie de nécessité à l’hôpital psychiatrique autonome de Cadillac." Annales Médico-psychologiques, revue psychiatrique 170, no. 8 (2012): 596–600. http://dx.doi.org/10.1016/j.amp.2012.08.004.

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3

Py, Michel. "Un pécule d’oboles de Marseille du milieu du Ve siècle avant notre ère sur l’oppidum du Marduel à Saint-Bonnet-du-Gard." Revue numismatique 6, no. 174 (2017): 119–40. http://dx.doi.org/10.3406/numi.2017.3353.

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4

Guihard, Pierre-Marie, Cécile Allinne, and Éric Broine. "La fouille du trésor monétaire de Saint-Germain-de-Varreville (Manche) : stratigraphie d’un pécule de 14 528 nummi (première moitié du ive siècle)." Annales de Normandie 63e année, no. 1 (2013): 3. http://dx.doi.org/10.3917/annor.631.0003.

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5

Charbonneau, Alexandre. "Jean-Pierre Le Crom et Marc Boninchi (dir.), La chicotte et le pécule. Les travailleurs à l’épreuve du droit colonial français (XIXe-XXe siècles)." Revue de droit comparé du travail et de la sécurité sociale, no. 2 (May 31, 2022): 168–71. http://dx.doi.org/10.4000/rdctss.3858.

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6

Lachaud, Stéphanie. "Approche socio-économique du petit peuple des vignes en Sauternais aux XVIIe et XVIIIe siècles." Annales du Midi : revue archéologique, historique et philologique de la France méridionale 129, no. 298 (2017): 231–53. http://dx.doi.org/10.3406/anami.2017.8879.

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Petit vignoble du sud-ouest du royaume de France, le Sauternais connaît une population rurale assez abondante aux XVIIe et XVIIIe siècles, majoritairement composée de vignerons, de journaliers ou manouvriers. Cette société rurale largement organisée autour de la production viticole est en mutation aux XVII e et XVIII e siècles, car le vignoble s’oriente vers une production de plus grande qualité et vers les exportations sous l’impulsion des grands propriétaires. Mais quelle est la place de ces modestes travailleurs de la terre dans un vignoble largement tenu par des élites, nobiliaires ou bordelaises ? Cette place a-t-elle notablement évolué en lien avec la transformation progressive des perspectives économiques ? La réalité économique que recouvrent ces dénominations de manouvriers et de journaliers est complexe et modeste à la fois, dans une société rurale où la pluriactivité et la polyculture restent bien présentes. Le cadre de vie de ces petites gens de la terre confirme cette précarité économique car il se caractérise par une plus grande simplicité que chez les laboureurs, chez certains artisans (notamment les tonneliers) ou chez les marchands : une voire deux pièces à vivre, une absence d’intimité, un mobilier réduit au minimum. Les sources permettent aussi d’envisager les questions d’endogamie et surtout d’homogamie sociales, mais aussi celle des mobilités : il apparaît alors que les trajectoires d’ascension sociale des petites gens restent difficiles à retracer car elles sont rares. Les mobilités observées sont souvent géographiques et temporaires, avec notamment des emplois de domestiques à Bordeaux ou des emplois saisonniers (même s’ils sont peu nombreux en raison du calendrier viticole) pour se constituer un petit pécule en vue du mariage. Ces modestes travailleurs de la terre sont un rouage essentiel mais peu connu de la formation d’un vignoble de qualité en Bordelais.

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Lacroix, Annick. "Jean-Pierre Le Crom et Marc Boninchi (dir.), La chicotte et le pécule. Les travailleurs à l’épreuve du droit colonial français ( xix e - xx e siècles) , Rennes, Presses universitaire de Rennes, « Histoire », 2021, 332 p." Le Mouvement Social N° 282, no. 1 (2023): 150–53. http://dx.doi.org/10.3917/lms1.282.0150.

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8

Simon, Bence, Anita Benes, Szilvia Joháczi, and Ferenc Barna. "New excavation of the Roman Age settlement at Budapest dist. XVII, Péceli út (15127) site." Dissertationes Archaeologicae 3, no. 7 (2020): 273–80. http://dx.doi.org/10.17204/dissarch.2019.273.

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In autumn 2019 the staff of the Institute of Archaeological Sciences conducted a rescue excavation in the suburbs of Budapest, on the territory of Pécel. Based on the long research history of the investigated site (Budapest dist. XVII, Péceli út) a settlement of the Imperial Period was expected. The excavation confirmed the expectations and two buildings, several ditches, an outdoor oven and numerous refuse pits were unearthed from the 3rd–4th century AD. The features contained many Samian ware fragments, which shed light on the Roman-Barbarian trade relations during the middle Imperial Period.

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9

Dion, Robert, and Frances Fortier. "Péculat biographique et enchevêtrement générique." Protée 31, no. 1 (2004): 51–64. http://dx.doi.org/10.7202/008501ar.

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Résumé Cette étude examine les divers phénomènes de transposition qui se trouvent au principe de l’ouvrage de Thomas De Quincey intitulé Les Derniers Jours d’Emmanuel Kant (1827). La première partie révèle la singularité essentielle de ce texte qui a longtemps été attribué à De Quincey lui-même alors qu’il n’était, de fait, que la reprise intégrale, en traduction, d’Immanuel Kant in seinen letzten Lebensjahren (1804), œuvre du secrétaire de Kant, Wasianski. Ce matériau biographique se voit transposé par l’ajout d’un appareil de notes qui vient gauchir le statut proprement factuel du texte et lui donner une tonalité ironique ; les diverses traductions françaises du texte de De Quincey viendront d’ailleurs encore épaissir le palimpseste. La seconde partie de l’étude met en lumière, à partir de traits textuels majeurs (brouillage énonciatif, télescopage des temps, etc.), toute une série de transpositions proprement génériques qui interfèrent avec les genres mineurs, en vogue à l’époque, du recueil d’anecdotes, des mémoires et du tombeau. En fin de compte, Les Derniers Jours d’Emmanuel Kant apparaissent comme le détournement délibéré, sur les plans diégétique, discursif et axiologique, des traits prototypiques de la biographie.

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Visudmedanukul, Punlop, and Masashi Kamon. "Graphically Determined Column Péclet Number." Journal of Geotechnical and Geoenvironmental Engineering 133, no. 2 (2007): 227–30. http://dx.doi.org/10.1061/(asce)1090-0241(2007)133:2(227).

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Più fonti

Tesi sul tema "Pécule"

1

Brickman, Larry A. "Numerical evaluation of the pair-distribution function of dilute suspensions at high Péclet number." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/11305.

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2

Dapelo, Davide, S. Simonis, J. J. Krause, and John Bridgeman. "Lattice-Boltzmann coupled models for advection-diffusion flow on a wide range of Péclet numbers." Elsevier, 2021. http://hdl.handle.net/10454/18457.

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Yes<br>Traditional Lattice-Boltzmann modelling of advection–diffusion flow is affected by numerical instability if the advective term becomes dominant over the diffusive (i.e., high-Péclet flow). To overcome the problem, two 3D one-way coupled models are proposed. In a traditional model, a Lattice-Boltzmann Navier–Stokes solver is coupled to a Lattice-Boltzmann advection–diffusion model. In a novel model, the Lattice-Boltzmann Navier–Stokes solver is coupled to an explicit finite-difference algorithm for advection–diffusion. The finite-difference algorithm also includes a novel approach to mitigate the numerical diffusivity connected with the upwind differentiation scheme.

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3

Lucking, Bigué Jean-Philippe. "Étude du comportement des fluides magnétorhéologiques (MR) en compression-cisaillement simultanée." Thèse, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/9555.

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Les fluides magnétorhéologiques (MR) sont des fluides intelligents dont la viscosité apparente peut être modifiée rapidement (<1ms) par l'application d'un champ magnétique externe. À l'aide de cette caractéristique unique, les embrayages MR permettent de moduler rapidement un couple entre deux surfaces sans contact mécanique direct. De construction simple et robuste, les embrayages MR offrent ainsi un potentiel remarquable d'innovation pour diverses applications robotiques nécessitant un contrôle rapide et une haute fiabilité, comme dans les domaines de l'automobile [10], de l'aéronautique [16] ou de l'interaction humaine [77]. À ce jour, les embrayages MR exploitent le fluide MR strictement en cisaillement pur. Dans de telles conditions, la densité de couple des embrayages est limitée par l'optimisation de la mécanique des embrayages (ex. : poids) [63] et les propriétés fondamentales des fluides MR (ex. : contrainte) [11]. Alors qu'en cisaillement pur, la contrainte des fluides MR est limitée à ∼100 kPa, des études récentes démontrent qu'elle peut être augmentée d'un ordre de grandeur (>1000 kPa) lorsque le fluide MR est soumis à une compression, avant d'être cisaillé [89]. La combinaison de la compression et du cisaillement du fluide MR pourrait ainsi décupler la densité de couple des embrayages MR, mais ce phénomène d'agrégation assistée par compression, aussi appelé squeeze-strengthening ou super-strong} (SS), est toujours très mal compris. Beaucoup d'incertitude persiste quant à l'origine exacte du phénomène [45], des conditions qui le favorisent [55] [75] et des effets qu'il engendre [31]. Dans le but ultime d'augmenter la densité de couple des embrayages MR à l'aide du phénomène SS, le présent projet de recherche vise à étudier le comportement rhéologique des fluides MR dans des conditions de compression et de cisaillement simultané afin d'en comprendre les conditions qui favorisent le phénomène d'augmentation des contraintes. Pour ce faire, un banc d'essai permettant la compression pure, le cisaillement pur et la compression-cisaillement simultanée des fluides MR est conçu et utilisé pour étudier le fluide MR lorsque soumis à des conditions de chargement typique des embrayages MR. Les résultats expérimentaux issus de cette vaste étude expérimentale permettront d'établir un lien direct entre ce phénomène et le celui de filtration, duquel un modèle prédictif sera proposé. À l'aide du modèle théorique, le phénomène SS sera étudié à l'aide de diverses compositions de fluide MR (ex. : concentration, taille des particules, viscosité) et différentes géométries de compression, ce qui permettra de valoriser le modèle pour la conception préliminaire d'embrayages MR qui exploitent le phénomène SS.

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Gustafsson, Olof. "Nanoparticle Removal and Brownian Diffusion by Virus Removal Filters: Theoretical and Experimental Study." Thesis, Uppsala universitet, Nanoteknologi och funktionella material, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-335802.

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This study aims to examine the throughput of nanoparticles through a Cladophora cellulose based virus removal filter. The effect of Brownian motion and flow velocity on the retention of 5 nm gold nanoparticles, 12.8 nm dextran nanoparticles and 28 nm ΦX174 bacteriophages was examined through MATLAB simulations and filtration experiments. Modeling of Brownian motion at different flow velocities was performed in MATLAB by solving the Langevin equation for particle position and velocity for all three types of particles. The motion of all three particle types was shown to be constrained at local flow velocities of 1∙10-2 m/s or greater. The constraint was greatest for ΦX174 bacteriophages, followed by dextran particles and then gold particles as a result of particle diameter. To verify the effect experimentally, virus removal filters were prepared with a peak pore width of 23 nm. Filtration experiments were performed at different flux values where gold and dextran particles did not exhibit any difference in retention between fluxes. However, a significant amount of gold and dextran particles were removed by the filter despite being smaller than the measured pore size. A decrease in retention with filtrated volume was observed for both particle types. Filtration of ΦX174 bacteriophages exhibited a difference in retention at different fluxes, where all bacteriophages where removed at a higher flux. The results from both simulations and experiments suggest that the retentive mechanism in filtering is more complex than what can be described only by size exclusion sieving, Brownian diffusion and hydrodynamic constraint of particles.

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5

Sfredo, Marilia Assunta. "Estudo da dispersão na secagem de frutos de café em secador de bandejas vibradas." Universidade Federal de Uberlândia, 2006. https://repositorio.ufu.br/handle/123456789/15067.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>To study the dispersion of the coffee fruits during the drying, a vibrated tray drier with recycle was used. The dryer consists basically of four sections: drying vertical tunnel, vibration system, system of warm air supply to the drying tunnel and recycle system of coffee fruits. The drying tunnel contains four perforated trays through which the coffee fruits and air flow out, in cross flow. The coffee fruits drying was carried out using two experimental design, where the studied variables were, for the first design: coffee fruits temperature (40; 45 and 50ºC); mass of coffee fruits (11.5; 12.5 and 13.5 kg) and air mass rate (7; 8 and 9 kg air/min); the varieties of coffee fruits were: Acaiá, Catuaí and Mundo Novo; and for the second design: mass of coffee fruits (10; 12 and 14 kg) and air mass rate (7; 8 and 9 kg air/min), with coffee fruits temperature around 45ºC and the coffee variety Mundo Novo. For the first experimental design, the coffee fruits temperature only influenced significantly the drying time, where the largest temperature level reduces in 26.77 h the drying time. For the second experimental design, the studied variables were not significant on drying time. Coffee fruit sphericity, density, sticky decreased with the decrease of the moisture content. With reference to the quality of coffee grain, the best operational conditions were obtained with greater coffee fruits mass and air mass rate. The coffee fruits flow in the drying tunnel is promoted by vibration of the trays coupled to electromagnetic vibrators. The vibration amplitude was determined by an accelerometer connected to a signal conditioner and an analogical oscilloscope. The vibration amplitude decreased with the reduction of the coffee fruits moisture content due to the shrinkage and decrease of the mass, sticky, density and particle size coffee fruits. The coffee fruits mass rate and the residence time distribution were determined (RTD), during the drying. At the end of the drying, the flow occurs with easiness due to: absence of sticky of the coffee fruits; decrease of the particle mass and particle vibration damping decrease, due to particle rigidity acquired in the drying. The dispersion coefficient (Ez) was determined by Taylor Dispersion Model, Free Dispersion Model and Modified Free Dispersion Model. For the great majority of the experiments, the model that better fitted the experimental data (greater coefficient of correlation) was the model of the Modified Free Dispersion. The dispersion coefficient (Modified Free Dispersion) ranged from 1.31×10-4 to 68.67×10-4 m2/s. The Péclet number ranged from 1.15 to 31.00.<br>Para estudar a dispersão dos frutos de café durante a secagem, utilizou-se um secador de bandejas vibradas com reciclo. O secador consiste basicamente de quatro seções: túnel vertical de secagem, sistema de vibração, sistema de injeção de ar aquecido no túnel de secagem e sistema de reciclo dos frutos de café. O túnel de secagem contém quatro bandejas perfuradas por onde escoam os frutos de café e o ar, em fluxo cruzado. A secagem dos frutos de café foi realizada utilizando-se dois planejamentos experimentais, onde as variáveis estudadas foram, para o primeiro planejamento de secagem: temperatura dos frutos de café (40; 45 e 50ºC); massa de frutos de café alimentada (11,5; 12,5 e 13,5 kg) e vazão de ar de secagem (7; 8 e 9 kg ar/min), a variedade dos frutos de café foram: Acaiá, Catuaí e Mundo Novo; e para o segundo planejamento de secagem: massa de frutos de café (10; 12 e 14 kg) e vazão de ar (7; 8 e 9 kg ar/min), mantendo-se a temperatura dos frutos em 45ºC e a variedade Mundo Novo. Para o primeiro planejamento somente a temperatura dos frutos influenciou significativamente o tempo de secagem, onde o maior nível de temperatura reduz em 26,77 h o tempo de secagem. Para o segundo planejamento as variáveis estudadas não foram significativas para o tempo total de secagem dos frutos de café. Durante a secagem ocorre encolhimento dos frutos de café, diminuição da esfericidade, da pegajosidade, da densidade aparente e aumento da área superficial específica com a diminuição do conteúdo de umidade dos frutos de café. Em relação à qualidade do grão de café, as melhores condições operacionais foram obtidas com maior massa e maior vazão de ar de secagem. O escoamento do café no túnel de secagem é promovido pela vibração das bandejas acopladas a vibradores eletromagnéticos. A amplitude de vibração foi determinada por um acelerômetro acoplado a um condicionador de sinal e a um osciloscópio analógico. A amplitude vibracional diminuiu com a diminuição da umidade dos frutos de café devido ao encolhimento e à diminuição da massa, da pegajosidade, da densidade e do diâmetro dos frutos de café. Durante a secagem foram determinadas a vazão mássica dos frutos de café e a distribuição do tempo de residência (DTR). Ao final da secagem, o escoamento dos frutos de café ocorre com maior facilidade devido a: ausência de pegajosidade dos frutos de café; diminuição da massa das partículas e redução do amortecimento da vibração dos frutos de café devido à rigidez adquirida na secagem. O coeficiente de dispersão (Ez) foi determinado pelos modelos da Dispersão de Taylor, da Dispersão Livre e da Dispersão Livre Modificado. Para a grande maioria dos experimentos, o modelo que melhor se ajustou aos dados experimentais (maior coeficiente de correlação) foi o Modelo da Dispersão Livre Modificado. O coeficiente de dispersão dos frutos de café variou de 1,31×10-4 a 68,67×10-4 m2/s. O número de Péclet variou de 1,15 a 31,00.<br>Doutor em Engenharia Química

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6

Yamazaki, Atsushi. "Bouvard et Pécuchet, le roman philosophique : classification, magnétisme, philosophie." Thesis, Paris 8, 2019. http://www.theses.fr/2019PA080050.

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L’objectif de cette étude consiste à interroger l’œuvre inachevée de Gustave Flaubert, Bouvard et Pécuchet, dans sa triple dimension, encyclopédique, critique et comique, afin de faire apparaître sa puissance d’interrogation philosophique.Dans la première partie, on s’interroge sur la manière dont Bouvard et Pécuchet abordent les savoirs, en analysant deux modalités de leur apprentissage : l’usage des signes et la classification. Comment classer les plantes, les animaux, les hommes ? C’est une question qui les inquiète tout au fil de leur périple. La question demeure même dans la Copie.La deuxième partie est consacrée à l’analyse de l’épisode du magnétisme du chapitre VIII du roman. Cet épisode doit sa structure générale à l’immense corpus du magnétisme (Mesmer, Puységur, etc.). Les théories et pratiques des deux magnétiseurs sont riches d’implications épistémologiques, dans la mesure où elles renvoient toutes à l’un ou l’autre des moments de l’histoire du magnétisme. Pour éclairer ces implications, il faut explorer le dossier « Mysticisme-Magnétisme ». L’objectif de cette partie est donc de restituer au roman son enjeu épistémologique.La troisième partie est destinée à analyser, d’abord, le scénario épistémologique qui articule étroitement deux épisodes du chapitre VIII, ensuite, explorer le dossier « Philosophie ». Dans la bibliothèque philosophique du roman se trouvent convoqués divers philosophes, Descartes, Cousin, Hegel, Spinoza, Montaigne. Comment le romancier a-t-il procédé à une fabulation narrative de questions métaphysiques comme les causes finales, le libre arbitre, le critérium de vérité ? Telle est l’interrogation centrale qui se pose dans cette partie<br>The purpose of this study is to investigate the unfinished work of Gustave Flaubert, Bouvard and Pécuchet, focusing on its own triple dimensions : encyclopedic, critical and comic, in order to reveal the philosophical meaning of this novel.The first part of this paper highlights the method how Bouvard and Pécuchet approach knowledge, and analyzes two models of their learning : the usage of signs and the classification. How to classify plants, animals, men ? This is the question to annoy them all the time during their encyclopedic journey. The question remains even in the Copy.The second part of the paper is devoted to the analysis of the episode of animal magnetism in chapter VIII of the novel. The general structure of the episode is based on the immense corpus of magnetism (Mesmer, Puységur). The theories and practices of the two magnetizers are full of epistemological implications, as long as each of their theories and practices refers to a certain moment of the history of magnetism. In order to clarify those implications, the “Mysticism-Magnetism” file must be explored. In other words, the purpose of the second part is to make this novel restore an epistemological scheme.The third part of the paper firstly discusses the epistemological scenario that closely links two episodes of chapter VIII, and secondly explores the “Philosophy” file. To the philosophical library in this novel, various philosophers such as Descartes, Cousin, Hegel, Spinoza and Montaigne are summoned. How did the novelist generate a narrative fiction from metaphysical questions such as final causes, free will and criterion of truth ? This is the main question studied in the third part

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Fialová, Kateřina. "Standardizace ošetřovatelské péče v Oblastní nemocnici Náchod." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-329054.

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8 ABSTRACT Title: Implementation of nursing practice standards in Nachod Regional Hospital Author: Kateřina Fialová Department: Charles University in Prague, Faculty of Humanities, Department of Management and Supervision in Social and Health Organisations Supervisor: Mgr. Petr Vrzáček, Department of Management and Supervision in Social and Health Organisations The focus of the thesis was development and especially implementation of nursing practice standards as well as exploration of non-medical health professionals' attitudes towards this process in Nachod Regional Hospital. The theoretical part clarified the concept of quality, standard, audit, accreditation, certification and also addressed the role of health and nursing care management in quality control. The practical part was divided into three research sections. The first one diagnosed nursing practice standards, their prototype version above all. The findings from this diagnosis provided two recommendations - to revise current version of methodology for standard process creation and to start changing health professionals' attitudes towards standards and standardization of nursing practice. The quantitative research in the second section analysed in detail attitudes and motivation of non-medical health professionals to make the development...

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Libri sul tema "Pécule"

1

La chicotte et le pécule: Les travailleurs à l'épreuve du droit colonial français, XIXe-XXe siècles. Presses universitaires de Rennes, 2021.

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Ricerche sul peculium imprenditoriale. Cacucci, 2008.

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3

Elasri, Saïd. Péche et pécheurs d'Agadir. 1990.

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Capitoli di libri sul tema "Pécule"

1

Pomeau, Yves. "Dispersion at Large Péclet Number." In Mixing. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4697-9_12.

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2

Pacciarini, Paolo, and Gianluigi Rozza. "Reduced Basis Approximation of Parametrized Advection-Diffusion PDEs with High Péclet Number." In Lecture Notes in Computational Science and Engineering. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10705-9_41.

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3

Feireisl, Eduard, and Antonín Novotný. "Small Péclet Number Approximation as a Singular Limit of the Full Navier-Stokes-Fourier System with Radiation." In New Directions in Mathematical Fluid Mechanics. Birkhäuser Basel, 2009. http://dx.doi.org/10.1007/978-3-0346-0152-8_8.

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4

Alexandrov, Dmitri V., and Peter K. Galenko. "Selection Criterion of Stable Mode of Dendritic Growth with n-Fold Symmetry at Arbitrary Péclet Numbers with a Forced Convection." In IUTAM Symposium on Recent Advances in Moving Boundary Problems in Mechanics. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13720-5_17.

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5

Vimont, Jean-Claude. "Le pécule des détenus." In Les Français et l'argent, XIXe-XXIe siècle. Presses universitaires de Rennes, 2011. http://dx.doi.org/10.4000/books.pur.121014.

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6

"Pécel." In Encyclopedic Dictionary of Archaeology. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58292-0_160286.

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7

"Baden-Pécel." In Encyclopedic Dictionary of Archaeology. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58292-0_20040.

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8

Perella, A. J. "Highly Accurate Solution of the Stationary Convection-Diffusion Equation." In Numerical Methods for Fluid Dynamics V. Oxford University PressOxford, 1996. http://dx.doi.org/10.1093/oso/9780198514800.003.0016.

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Abstract In this paper we propose a method which is applicable to the n-dimensional convection–diffusion equation. It is a generalisation of a method described in [5) but the analysis is quite different and leads us to different conclusions. It provides a natural interpolation between the Galerkin method on Cartesian grids for low mesh Péclet numbers and the Cell Vertex Finite Volume Method for high mesh Péclet numbers, except in the case where the flow is along the mesh lines in which case we recover a new method for the pure convection equation. Our method is designed to control the errors on the element boundaries with the consequence of controlling oscillations.

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9

Vásárhelyi, Bálint Márk. "A Péceli Kör és az egyházi egyesületek." In Reformáció Öröksége. Károli Gáspár Református Egyetem, 2023. http://dx.doi.org/10.61376/hit.2022.vasarhelyi.37.

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10

"Theory of Microfluidics." In Microfluidics and Lab-on-a-Chip. The Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781782628330-00001.

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The theory of microfluidics is a fundamental tool for understanding microfluidic chips and their applications. In this chapter, the phenomena of fluid dynamics are introduced and scaled down to understand how fluid behaviour changes when flowing in microchannels. The introduction of dimensionless numbers, such as Reynolds, Péclet and capillary numbers, is used to determine the prevalent forces in fluid momentum and mass transfer and to evaluate the predominance of surface and volume forces.

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Atti di convegni sul tema "Pécule"

1

Titova, E. A. "2D dendrite shape in the large chemical Péclet number limit." In PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2018): Proceedings of the V International Young Researchers’ Conference. Author(s), 2018. http://dx.doi.org/10.1063/1.5055175.

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2

App, J. F. "Flow Profile Estimation in Horizontal, Hydraulically Fractured Wells Using a Péclet Number Approach." In Unconventional Resources Technology Conference. American Association of Petroleum Geologists, 2022. http://dx.doi.org/10.15530/urtec-2022-3723405.

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3

Chalhub, D. J. M. N., L. A. Sphaier, and L. S. de B. Alves. "Hybrid Eigenfunction-Discretization Methodology for Solving Convective Heat Transfer Problems." In ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ht2012-58336.

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This paper presents a novel methodology for the solution of problems that include diffusion and advection effects, as naturally occur in convective heat transfer problems. The methodology is based on writing the unknown temperature field in terms of eigenfunction expansions, as traditionally carried-out with the Generalized Integral Transform Technique (GITT). However, a different approach is used for handling advective derivatives. Rather than transforming the advection terms as done in traditional GITT solutions, upwind discretization schemes (UDS) are used prior to the integral transformation. With the introduction of upwind approximations, numerical diffusion is introduced, which can be used to reduce unwanted oscillations that arise at higher Péclet values. This combined methodology is termed the GITT-UDS for convective problems. The procedure is illustrated for a simple case of one-dimensional Burgers’ equation with temperature-dependent velocities. Numerical results are calculated, showing that augmenting the upwind approximation parameter can effectively reduce solution oscillations for higher Péclet values.

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4

Titova, E. A. "3D dendrite shape in the large chemical Péclet number limit in the case of rotational symmetry." In PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2019): Proceedings of the VI International Young Researchers’ Conference. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5134327.

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5

Becker, Steven, Hendrik Hotz, Benjamin Kirsch, Jan C. Aurich, Erik v. Harbou, and Ralf Müller. "A Finite Element Approach to Calculate Temperatures Arising During Cryogenic Turning of Metastable Austenitic Steel AISI 347." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6541.

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In this paper an inverse method is presented to evaluate the inner workpiece temperature distribution during cryogenic turning of metastable austenitic steel AISI 347 utilizing a FE representation of the process. Temperature data during the experiments is provided by thermocouples and a commercial thermo-graphy system. A constant cutting speed at two varying feeds are investigated. Inverse parameter verification by aligning simulated and experimental data in a least squares sense is achieved. A heat flux from tool to workpiece as well as heat transfer coefficients for forced convection by air and by carbon dioxide as cryogenic coolant are identified for each set of cutting parameters. Rigid body rotation in the model is considered applying convective time derivatives of the temperature field. Unphysical oscillations occurring in regions of high Péclet numbers are suppressed utilizing a streamline-upwind/Petrov-Galerkin scheme.

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6

Llagostera, Jorge, and José R. Figueiredo. "Mixed Convection in Flow Past a Porous Cavity: Application of the UNIFAES Discretization Scheme." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0607.

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Abstract Combined natural and forced convection occurring in saturated porous media is an important subject in several engineering fields, including design of high performance thermal insulation systems, packed beds, contaminants flow, and the development of geothermal resources. The paper presents numerical simulation results on mixed convection flow past a porous cavity located in a porous layer. The steady-state regime is studied for several intensities of the buoyancy effects due to temperature variations. The influences of Péclet and Rayleigh numbers on flow pattern and temperature distributions are examined. Local and global Nusselt numbers are reported for the heated wall. The differential equations were approximated numerically, being discretized by integration over finite volumes. The fluxes at the volume boundaries were represented using the UNIFAES discretization scheme. The UNIFAES, unified finite approaches exponential scheme for convective-diffusive fluid transport equations, has shown excellent accuracy and stability with irregular grids.

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7

Escandón, Juan P., Juan G. Fernández, Oscar E. Bautista, and Federico Méndez. "Second Law Analysis for a Mixed Electro-Osmotic and Pressure Driven Flow of a Viscoelastic Fluid in a Micro-Channel." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89617.

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In this work the entropy generation rate in a parallel flat plate micro-channel under mixed electro-osmotic and pressure driven flow with a non-Newtonian fluid is analyzed. A fully-developed flow is considered and the fluid obeys a constitutive relation based in a simplified Phan-Thien-Tanner model. The temperature distributions of a conjugate heat transfer problem in the micro-channel were solved asymptotically in steady-state, then, expressions for dimensionless local and average entropy generation rate are obtained. The aim of this paper is to show the influence of dimensionless parameters involved on the entropy generation rate: the viscoelastic parameter, the ratio of pressure forces to electro-osmotic forces, the Péclet number, the normalized power generation term, the dimensionless temperature difference, the ratio of micro-channel thickness to length, the ratio of micro-channel wall thickness to length and the conjugation parameter; this set of parameters controls directly the thermal performance of this micro-channel. We can predict that the entropy generation rate is basically dominated by the Joule heating effect.

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8

Rossi di Schio, Eugenia. "Analysis of the Forced Convection in a Porous Channel Saturated by a Nanofluid: Effects of Brownian Diffusion and Thermophoresis." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39634.

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The Darcy-Graetz problem for a channel filled by a nanofluid saturated porous medium is studied. The flow is assumed to be fully developed, and a boundary temperature linearly varying with the longitudinal coordinate in the thermal entrance region is prescribed. A study of the thermal behaviour of the nanofluid is performed by solving numerically the fully–elliptic coupled equations. For the model of the nanofluid, both thermophoresis and Brownian diffusion are taken into account. The governing equations have been solved separately for the fully developed region and for the thermal entrance region. With reference to the fully developed region the solution has been obtained analytically, while for the thermal entrance region it has been obtained numerically, by a Galerkin finite element method implemented through the software package Comsol Multiphysics (© Comsol, Inc.). The analysis shows that for physically interesting values of the Péclet number the concentration field depends very weakly on the temperature distribution. Indeed, the homogeneous model could be employed effectively, since the effects of thermophoresis and Brownian diffusion are negligible.

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9

Ghanem, Akram, Thierry Lemenand, Dominique Della Valle, and Hassan Peerhossaini. "Optimized Chaotic Heat Exchanger Configurations for Process Industry: A Numerical Study." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16115.

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A numerical investigation of chaotic laminar flow and heat transfer in isothermal-wall square-channel configurations is presented. The computations, based on a finite-volume method with the SIMPLEC algorithm, are conducted in terms of Péclet numbers ranging from 7 to 7×105. The geometries, based on the split-and-recombine (SAR) principle, are first proposed for micromixing purposes, and are then optimized and scaled up to three-dimensional minichannels with 3-mm sides that are capable of handling industrial fluid manipulation processes. The aim is to assess the feasibility of this mass- and heat-transfer technique for out-of-laboratory commercial applications and to compare different configurations from a process intensification point of view. The effects of the geometry on heat transfer and flow characteristics are examined. Results show that the flux recombination phenomenon mimicking the baker’s transform in the SAR-1 and SAR-2 configurations produces chaotic structures and promotes mass transfer. This phenomenon also accounts for higher convective heat transfer exemplified by increased values of the Nusselt number compared to the chaotic continuous-flow configuration and the baseline plain square-duct geometry. Energy expenditures are explored and the overall heat transfer enhancement factor for equal pumping power is calculated. The SAR-2 configuration reveals superior heat-transfer characteristics, enhancing the global gain by up to 17-fold over the plain duct heat exchanger.

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10

Duan, Zhixuan, Alireza Kalantari, and Vincent McDonell. "Parametric Analysis of Flashback Propensity With Various Fuel Compositions and Burner Materials." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43629.

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Flashback is a key operability issue for low NOx premixed combustion of hydrogen enriched fuels. Previous work has systematically investigated the impact of fuel composition on flashback propensity and noted the coupling of flashback with burner tip temperature. It led to models for critical velocity gradient as an indicator of flashback propensity as a function of parameters studied, such as fuel composition, burner tip temperature and laminar flame speed, etc. The present work further analyzes existing data and develops an empirical physical model for flashback propensity as a function of dimensionless groups. A comprehensive parameter screening is conducted and the potential variables determining flashback behavior are catalogued into five types: operational parameters, unburnt conditions, ambient conditions, rig properties and others. The objective of the analysis is to predict the critical operational parameters with given unburnt conditions which are generally known to the hardware designer. Other factors, such as ambient conditions and rig properties might also affect the prediction performance. To account for such factors, a dimensional analysis is conducted based on Buckingham Pi theorem. The critical Damköhler number is selected as the indicator of flashback propensity and a model is developed suggesting the significance of preferential diffusion (Le), heat loss (TuT0), thermal coupling effect (TtipTu) and flame Péclet number (Pef) as follows: Da = Const. · Le -6.12 · T u T 0 -1.71 · T tip T u -3.69 Pe f 1.89 · f 1 θ ′ d · f 2 P u P 0 Finally, preliminary results for pressure effects are presented.

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