324 research outputs found
Synchronization and Spin-Flop Transitions for a Mean-Field XY Model in Random Field
No full textWe characterize the phase space for the infinite volume limit of a ferromagnetic mean-field XY model in a random field pointing in one direction with two symmetric values. We determine the stationary solutions and detect possible phase transitions in the interaction strength for fixed random field intensity. We show that at low temperature magnetic ordering appears perpendicularly to the field. The latter situation corresponds to a spin-flop transition
Path-space moderate deviations for a class of Curie–Weiss models with dissipation
No full textWe modify the spin-flip dynamics of the Curie–Weiss model with dissipation in Dai Pra, Fischer and Regoli (2013) by considering arbitrary transition rates and we analyze the phase-portrait as well as the dynamics of moderate fluctuations for macroscopic observables. We obtain path-space moderate deviation principles via a general analytic approach based on the convergence of non-linear generators and uniqueness of viscosity solutions for associated Hamilton–Jacobi equations. The moderate asymptotics depend crucially on the phase we are considering and, moreover, their behavior may be influenced by the choice of the rates
Dynamical moderate deviations for the Curie-Weiss model
No full textWe derive moderate deviation principles for the trajectory of the empirical magnetization of the standard Curie–Weiss model via a general analytic approach based on convergence of generators and uniqueness of viscosity solutions for associated Hamilton–Jacobi equations. The moderate asymptotics depend crucially on the phase under consideration.Applied Probabilit
Path-space moderate deviation principles for the random field curie-weiss model
No full textWe analyze the dynamics of moderate fluctuations for macroscopic observables of the random field Curie-Weiss model (i.e., standard Curie-Weiss model embedded in a site-dependent, i.i.d. random environment). We obtain path-space moderate deviation principles via a general analytic approach based on convergence of nonlinear generators and uniqueness of viscosity solutions for associated Hamilton-Jacobi equations. The moderate asymptotics depend crucially on the phase we consider and moreover, the space-time scale range for which fluctuations can be proven is restricted by the addition of the disorder.</p
Path-space moderate deviations for a Curie-Weiss model of self-organized criticality
No full textThe dynamical Curie-Weiss model of self-organized criticality (SOC) was introduced in (Ann. Inst. Henri Poincaré Probab. Stat. 53 (2017) 658-678) and it is derived from the classical generalized Curie-Weiss by imposing a microscopic Markovian evolution having the distribution of the Curie-Weiss model of SOC (Ann. Probab. 44 (2016) 444-478) as unique invariant measure. In the case of Gaussian single-spin distribution, we analyze the dynamics of moderate fluctuations for the magnetization. We obtain a path-space moderate deviation principle via a general analytic approach based on convergence of non-linear generators and uniqueness of viscosity solutions for associated Hamilton-Jacobi equations. Our result shows that, under a peculiar moderate space-time scaling and without tuning external parameters, the typical behavior of the magnetization is critical
Mixité, gémination, co-éducation
No full textPour parler de la mixité à l'école, nous pouvons commencer par cette citation d'Antoine Prost (1983) : « De toutes les révolutions pédagogiques du siècle, la mixité est l'une des plus profondes. Elle oppose l'école de notre temps à celle de tous les siècles précédents » (p. 576). En effet, pour beaucoup d'élèves aujourd'hui, l'école non-mixte, c'est l'école d'avant, celle de leurs grands-parents. De façon quasi unanime, ils plébiscitent la co-présence des filles et des garçons en classe (Marro & Collet, 2009) avec les arguments comme : « on rigole bien ensemble » ou « on ne pourrait pas se connaître, si on était séparé à l'école » (p. 45). Pourtant, en France comme à Genève, l'éducation conjointe des filles et des garçons s'est installée pour des raisons pragmatiques, essentiellement financières, sans avoir été réellement pensée sur le plan pédagogique, sans avoir été couplée avec un projet de société ou un projet d'égalité entre les sexes (Lelièvre & Lelièvre, 1991). Or, dès les années 1960 les chercheuses féministes ont montré comment le système éducatif, et en particulier la mise en place non réfléchie de la mixité, discriminait les filles, et amenait garçons et filles à construire un rapport au savoir différent. On peut citer en particulier les travaux de Nicole Mosconi (1989), qui furent pionniers sur cette question, suivis quelques années plus tard par Marie Duru-Bellat (1990), Christian Baudelot et Roger Establet (1992)
MINOAN, CANAANITE, PHOENICIAN MARITIME CULTURESON THE SHORES OF THE WEST NILE DELTA:A BREAKING ARCHAEOLOGICAL STATEMENT
No full textIn this new maritime study, the author, Serge R. Collet, following those led on the Phoenician sea oriented culture in the nineties and the much more archaeological recent one on the Minoan presence nearby the Cape skylaion in South Tyrrhenian sea, reports his findings from the coastal margin of the West Nile delta: Alexandria shores and southern Maryut Lake.In spite of a heavy and disturbed social context in 2011-2012, he surveyed still accessible stretches of the shores and lake banks, bringing to light amazing ceramics evidence for imported Minoan, Canaanite, Phoenician and Sea People vessel. This ceramics is related to three type of maritime installations: a true marine cult place, a quay and a harbour basin holed in the Kurkar ridge on the south bank of Maryut Lake.To understand fully the reason why of the existence of such maritime structures it is necessary to deepen the notion of «sea orientation» by including the coastal environmental determinations as well as those bound to an imaginary of the sea, to a positive valuation of the sea as entity. The sea and marine environment remain essentially extraneous to the Nile culture.These new findings and breaking considerations lead the author to a re-evaluation of the completely forgotten discovery of impressive submersed harbour installations at the west of the Homeric Pharos Island by the French maritime engineer Gaston Jondet and their accurate re- examination by Sir A. Evans, who argues for a Minoan origin. They inaugurated in some way the maritime archaeological researches so well developed since the eighties by Avner Raban at the Leon Recanati Institute for Maritime studies, he founded at the University of Haifa. Avner Raban is deceased in February 2004. This contribution is devoted to his memory
La citation comme source de renseignements métalangagiers dans l’article scientifique
No full textLa citation remplit de nombreuses fonctions dans l’article scientifique. Outre sa fonction première, qui consiste à indiquer qu’une réflexion a été empruntée à un autre auteur, elle réalise au moins deux autres objectifs. Elle signale, d’une part, que l’article qui la contient entretient des rapports dialogiques avec un ensemble de textes antérieurs. De l’autre, elle cherche, en établissant des liens avec des travaux antérieurs, à augmenter la force de persuasion de l’article dans lequel elle s’insère. La citation peut, par ailleurs, avoir un autre objectif, qui est, cependant, beaucoup moins étudié. En effet, elle peut viser à rehausser l’efficacité et la précision du langage utilisé pour exprimer le contenu de l’article. La citation retrace et analyse, dans ce cas, des emplois antérieurs d’un terme souvent afin d’en préciser le sens. Ce type de citation, que nous nommons marqueur sémantique (Collet 2016, 2018), se repère, entre autres, dans les articles en sciences humaines et sociales. Notre but est de présenter les types de renseignements métalangagiers ou sémantiques qu’une telle citation est susceptible de contenir. Nous nous servirons à cette fin de données tirées d’un corpus couvrant plusieurs disciplines en sciences humaines et sociales, notamment la linguistique, la psychologie, la sociologie et l’histoire. Nous démontrerons également par une analyse quantitative que le recours aux marqueurs sémantiques est bien établi au sein des domaines susmentionnés.Citations perform many functions in scientific articles. In addition to their primary function, which is to recognize that a passage has been borrowed from another author, citations perform at least two other functions. On the one hand, they signal that the article in which they appear is in a dialogical relationship with past texts. On the other, they aim to increase the persuasive force of the article to which they have been added, by linking it to the works of others. Citations can, moreover, perform another function, which is, however, much less studied. They can be employed to augment the efficiency and the accuracy of the language used to express the article’s content. When used with this purpose, citations trace and analyze earlier usages of a term often with the aim to carefully delineate its meaning. These citations, which we have called semantic markers (Collet 2016, 2018), can be found, for instance, in scientific articles focusing on the humanities and the social sciences. Our aim is to present a classification of the various types of semantic information that semantic markers can convey. We will base the classification on data extracted from a corpus of scientific articles published in four disciplines in the humanities and social sciences: linguistics, psychology, sociology, and history. We will, furthermore, provide statistical data to show that the use of semantic markers is well established in the above-mentioned disciplines.Las citas en los artículos científicos cumplen con numerosas funciones. Además de su función primera, es decir indicar que se tomó prestada una reflexión de otro autor, la cita cumple con por lo menos dos funciones más. Por una parte, señala que el artículo en el que se encuentra mantiene relaciones dialógicas con un conjunto de trabajos anteriores. Por la otra, al establecer vínculos con trabajos anteriores, busca aumentar la fuerza de persuasión del artículo en el que se inserta. Además, puede tener otro objetivo mucho menos estudiado: el de apuntar a realzar la eficacia y la precisión del lenguaje utilizado para expresar el contenido del artículo. La cita reseña y analiza, en este caso, usos anteriores de un término con el fin, a menudo, de precisar su sentido. Este tipo de cita, la llamaremos indicador semántico (Collet 2016, 2018), se encuentra, entre otros, en los artículos de ciencias humanas y sociales. Nuestro objetivo es presentar los tipos de información metalingüística o semántica que este tipo de cita puede contener. Para ello utilizaremos datos extraídos de un corpus que cubre varias disciplinas de las ciencias humanas y sociales, en particular la lingüística, la sicología, la sociología y la historia. También mostraremos mediante un análisis cuantitativo que el uso de indicadores semánticos se encuentra bien establecido dentro de los campos mencionados
Elder Abuse in Skilled Nursing Facilities: A Qualitative Study with Ombudsmen from Fresno, Madera, and Merced Counties
No full textThe following thesis is a research study that aimed to find measures on how to both combat and prevent elder abuse and neglect in skilled nursing facilities (SNF). Elder abuse and neglect are currently becoming a worldwide issue that the World Health Organization has currently recognized as a health crisis. The United States has contributed to the problem of elder abuse with continuing the discriminatory act of Ageism that formed during the industrial revolution. The United States has tried to combat this social justice issue with the passing of the Older Americans Act in the 1960s, which formed the Agency on Aging, which created Long-Term Care Ombudsmen program. The Ombudsmen are advocates that represent the residents of SNFs. The literature proved that even with procedures in place, elder abuse and neglect continues in the United States. In order to better understand how to combat and how to prevent elder abuse and neglect in the central San Joaquin Valley, the researcher conducted a qualitative study with a with five Ombudsmen from Fresno, Madera, and Merced counties. Using grounded theory, relevant themes were extracted, and yielded suggestions of why abuse exists in SNFs, how to combat elder abuse and neglect and how to prevent it in the SNFs in this region of California. This thesis will show that these themes extracted pertaining to the cause of elder abuse in SNFs are directly related to social work ethics, and the suggestions on how to prevent the continuing, in addition, relate to the social work values of service and human relationships
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