28 research outputs found
Alternative distribution based GARCH models for Bitcoin volatility estimation
No full textKatsiampa (2017) shows that, among different GARCH models, the optimal conditional heteroskedasticity model regarding the goodness-of-fit to Bitcoin price data is the AR-Component GARCH (AR-CGARCH) model. However, in that paper the author does not take into account for statistical proprieties of Bitcoin’s return distribution, and even showing both skewness and non-normality of the data, we consider a standardized normal distribution for all studied GARCH models. This paper represents an improvement of the previous literature about GARCH model for Bitcoin. In particular, this paper examines different distributional assumptions about innovations distribution for some GARCH models, showing that it is possible to obtain better estimates through the AR(1)-APARCH(1,1) model assuming that innovations follow a t-student distribution
Gender and authorship in energy studies: Is there an impact?
No full textAlthough gender inequality has been examined and debated as one of the most prominent challenges within the scientific community, relatively little attention has been paid to gender differences with regard to authorship. The aim of this paper is to identify whether gender differences exist with respect to the impact factors of the journals in which male and female authors publish their research. Existing studies use machine-assisted tools to determine author gender. Given the limitations of this type of approach to data collection and coding, we opted for a manual approach that ensured both the inclusion of a high number of journals and greater precision in determining author gender. This paper focuses on authors who published articles on a concrete area of research (energy) in a specific region (Central and Eastern Europe) over a 14-year period (2004–2017). Our study identified a gender bias within energy-related research: male authors (or male-dominated teams) publish more often and on average in journals with higher impact factors than female authors
The Crisis of the Midlist Author in American Book Publishing
No full textOn apprendra ici comment un syndicat aide les auteurs obscurs, ceux qui se trouvent «au milieu» du catalogue d'un éditeur, et qui sont les plus nombreux, à protéger leurs œuvres et leurs revenus. C'est lors de la signature de leur contrat qu'ils doivent comprendre les enjeux et limiter l'arbitraire des éditeurs, des grosses maisons surtout ; mais le but recherché est de signer des accords généraux sur quelques principes avec les éditeurs, comme l'ont fait les Britanniques.Mattera Philip. The Crisis of the Midlist Author in American Book Publishing. In: Revue Française d'Etudes Américaines, N°78, octobre 1998. L'édition américaine en mouvement. pp. 38-47
Croce Rossa Italiana. Manuale di buone pratiche: esperienze da un Centro di Accoglienza per Richiedenti Asilo.
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GSK3β Modulates Timing-Dependent Long-Term Depression Through Direct Phosphorylation of Kv4.2 Channels
No full textSpike timing-dependent plasticity (STDP) is a form of activity-dependent remodeling of synaptic strength that underlies memory formation. Despite its key role in dictating learning rules in the brain circuits, the molecular mechanisms mediating STDP are still poorly understood. Here, we show that spike timing-dependent long-term depression (tLTD) and A-type K+ currents are modulated by pharmacological agents affecting the levels of active glycogen-synthase kinase 3 (GSK3) and by GSK3β knockdown in layer 2/3 of the mouse somatosensory cortex. Moreover, the blockade of A-type K+ currents mimics the effects of GSK3 up-regulation on tLTD and occludes further changes in synaptic strength. Pharmacological, immunohistochemical and biochemical experiments revealed that GSK3β influence over tLTD induction is mediated by direct phosphorylation at Ser-616 of the Kv4.2 subunit, a molecular determinant of A-type K+ currents. Collectively, these results identify the functional interaction between GSK3β and Kv4.2 channel as a novel mechanism for tLTD modulation providing exciting insight into the understanding of GSK3β role in synaptic plasticity
The Rutgers hybrid dogwood: naming and genetic diversity analysis
No full textBig-bracted dogwoods (Cornus spp.) are popular landscape trees in the United States, accounting for $30 million in sales annually. This group of dogwoods is comprised of the Florida dogwood (C. florida), the Asian dogwood (C. kousa) and the Pacific dogwood (C. nuttallii). They are beloved for their four season appeal: floral bract display in the spring, attractive green foliage in the summer, striking autumun colors in the fall and exfoliating bark in the winter. These trees are the focus of a big-bracted dogwood breeding program at Rutgers University, which started in the 1960s under the helm of Dr. Elwin Orton. His focus was to develop new pink or red-bracted varieties of C. kousa and red-bracted dwarf varieties of C. florida. In order to accomplish these breeding goals, Dr. Orton created the first inter-specific hybrids between C. florida × C. kousa and C. kousa × C. nuttallii. These hybrids have since become an important staple in the horticultural trade known for their vigor, enhanced disease tolerance and improved ornamental qualities. Part of this study was to formally name and describe these hybrids in order to facilitate scientific and horticultural communication. The C. florida × C. kousa hybrids were formally named Cornus × rutgersensis in honor of Rutgers University and the C. kousa × C. nuttallii were named Cornus × elwinortonii in honor of Dr. Elwin Orton. Only a handful of these hybrids were fertile potentially creating a genetic bottleneck in the Rutgers germplasm collection when they were used in breeding. Big-bracted dogwoods are highly heterozygous and sensitive to inbreeding depression requiring the breeding program to maintain high levels of genetic diversity within its breeding lines. Genetic diversity levels in the Rutgers breeding program are uknown. This study sought to elucidate the level of genetic diversity in 276 Rutgers University dogwood accessions and 59 from the University of Tennessee by using eleven simple sequence repeat molecular markers. Results showed that five consensus groups were found: C. florida group, Cornus × rutgersensis group, Cornus × elwinortonii group, C. kousa inter-specfic hybrid group and Pink-bracted C. kousa group. It was found that genetic diversity is high across the entire germplasm collection tested; however, limited genetic diversity exists within the Cornus × rutgers and Cornus × elwinortonii groups. This information will be important in the future of the Rutgers and other breeding programs allowing breeders to make more genetically distant crosses to help maintain high levels of genetic diversity.M.S.Includes bibliographical referencesby Robert Mattera II
Le vide dans le miroir. À propos de la « Ruth Kjär » de Melanie Klein et de Karin Michaelis
No full textInternational audienceThis article first presents a reading and an original version of a text by Karin Michaelis, made famous by Melanie Klein. In this text, entitled “The Empty Space,” the author speaks of Ruth Kjär, a woman suffering from severe “emptiness attacks” and depression. This woman, at the age of 34, suddenly began to paint and became a recognized artist in her country. Then, after having synthesized the biography of the artist, well known for a short time, we propose a clinical commentary in order to understand some elements of her psychological dynamics before and after the “trigger” of her art.Cet article présente tout d’abord une lecture et une version originale d’un texte de Karin Michaelis rendu célèbre par Melanie Klein sous le titre « L’espace vide », dans lequel Ruth Kjär, une femme souffrant de violents accès de vide en elle, se met, à l’âge de 34 ans, brusquement à la peinture et devient dans son pays, une artiste reconnue. Puis, après avoir synthétisé la biographie de cette artiste, retrouvée il y a peu, nous proposons un commentaire clinique permettant de saisir certains éléments de sa dynamique psychique avant et après le « déclenchement » de son art
Sublimation ou sinthomation ? Apports et réflexions cliniques sur la création dans la psychose
No full textInternational audienceThis text is a contribution to the problem of creation in psychosis. We know that the sublimation is a process of the neurotic structure, because of the relationship to the object and to the ego, that is always involved in that. But how is it for the person of psychotic structure for which the function of the object and the ego is quite different ? To move forward on this issue, the author proposes the concept of sinthomation, forged from sinthome "invented" by Lacan in 1975-76. We think that the sinthomation is a process by which the subject of psychotic structure tries to reconnect with reality by creating in himself the elements necessary for access it. Sublimation and sinthomation are deployed on the social fields of art, science and religion. Sinthome, sinthomation and sublimation are terms that this article compares and and defines, based on three clinical examples involving the process of sinthomation to varying degrees : a psychotic contemporary painter, a paraphrenic writer Jean-Pierre Brisset, and Vincent Van Gogh.Ce texte est une contribution à la problématique de la création dans la psychose. Nous savons que la sublimation est un processus propre à la structure névrotique car les rapports à l’objet et au moi y sont toujours impliqués. Qu’en est-il alors pour les personnes de structure psychotique pour lesquelles la fonction de ces instances est fort différente ? Pour avancer sur cette question, l’auteur propose le concept de sinthomation, forgé à partir du sinthome « inventé » par Lacan en 1975-76. Nous avançons l’idée que la sinthomation est un processus par lequel le sujet de structure psychotique tente de renouer avec la réalité en créant en soi-même les éléments nécessaires pour y accéder. Sublimation et sinthomation ont en commun de se déployer sur les champs sociaux de l’art, de la science et de la religion. Sinthome, sinthomation et suppléance sont des termes que cet article compare et définit en s’appuyant sur trois exemples cliniques mettant en jeu le processus de sinthomation à différents degrés : un peintre psychotique contemporain, l’écrivain paraphrène Jean-Pierre Brisset, et Vincent Van Gogh
Choreografie antropocenu, czyli o materiach wprawiających w ruch
No full textChoreographies of the Anthropocene: Mobilising matterA point of departure for the author is thesis proposed by T.J. LeCain, who studied anthropocentrism hidden in a very nucleus of debate about antropocene. One should, in his view, comprehend and analyse culture and technology as the part or the product of a matter. The “human age” initiated in the age of the industrial revolution driven with fossil fuels turns out to be an effect of transformations, of which coal is a chief perpetrator. The turn from anthropo- to carbocene let us examine factors which are the underlying reason for development of industrial-information society. The very material factors retaining wide understanding of the term “matter”, which can also include the temperature or the gravity are called to the scene, and then embodied or set in motion by choreographers — Mette Ingvartsen, Agata Siniarska and Aleksandra Borys — who try to problematize in their works the issue of dispersed, material agency. In her text the author examines how the problems essential for anthropocene and carbocene debates are being choreographed. Choreographies of the Anthropocene: Mobilising matterA point of departure for the author is thesis proposed by T.J. LeCain, who studied anthropocentrism hidden in a very nucleus of debate about antropocene. One should, in his view, comprehend and analyse culture and technology as the part or the product of a matter. The “human age” initiated in the age of the industrial revolution driven with fossil fuels turns out to be an effect of transformations, of which coal is a chief perpetrator. The turn from anthropo- to carbocene let us examine factors which are the underlying reason for development of industrial-information society. The very material factors retaining wide understanding of the term “matter”, which can also include the temperature or the gravity are called to the scene, and then embodied or set in motion by choreographers — Mette Ingvartsen, Agata Siniarska and Aleksandra Borys — who try to problematize in their works the issue of dispersed, material agency. In her text the author examines how the problems essential for anthropocene and carbocene debates are being choreographed
Multiway clustering with time-varying parameters.
No full textThis paper proposes a clustering approach for multivariate time series with time-varying parameters in a multiway framework. Although clustering techniques based on time series distribution characteristics have been extensively studied, methods based on time-varying parameters have only recently been explored and are missing for multivariate time series. This paper fills the gap by proposing a multiway approach for distribution-based clustering of multivariate time series. To show the validity of the proposed clustering procedure, we provide both a simulation study and an application to real air quality time series data. [Abstract copyright: © The Author(s) 2022.
