Scaling of Coulomb pseudo-potential in s-wave narrow-band superconductors

The Coulomb pseudo-potential $\mu^*$ is extracted by fitting the numerically calculated transition temperature $T_c$ of the Eliashberg-Nambu equation which is extended to incorporate the narrow-band effects, that is, the vertex correction and the frequency dependence of the screened Coulomb interaction. It is shown that even for narrow-band superconductors, where the fermi energy $\epsilon_F$ is comparable with the phonon frequency $\omega_{ph}$, the Coulomb pseudo-potential is a pertinent parameter, and is still given by $\mu^* = \mu/[1+\mu \ln(\epsilon_F/\omega_{ph})]$, provided $\omega_{ph}$ is appropriately scaled.Comment: 5 pages, 3 figures, accepted for publication by Phys. Rev.

A new and efficient intelligent collaboration scheme for fashion design

Technology-mediated collaboration process has been extensively studied for over a decade. Most applications with collaboration concepts reported in the literature focus on enhancing efficiency and effectiveness of the decision-making processes in objective and well-structured workflows. However, relatively few previous studies have investigated the applications of collaboration schemes to problems with subjective and unstructured nature. In this paper, we explore a new intelligent collaboration scheme for fashion design which, by nature, relies heavily on human judgment and creativity. Techniques such as multicriteria decision making, fuzzy logic, and artificial neural network (ANN) models are employed. Industrial data sets are used for the analysis. Our experimental results suggest that the proposed scheme exhibits significant improvement over the traditional method in terms of the time–cost effectiveness, and a company interview with design professionals has confirmed its effectiveness and significance

Où en est la synchronie, aujourd’hui ?

Dans cet article j’ai proposé de définir la synchronie à partir de l’idée directrice de Saussure, en termes de conscience linguistique des sujets parlants. D’après André Jacob, cette notion inaugurale de synchronie souffre d’une contradiction, à savoir qu’elle implique à la fois systématicité et temporalité. Pour résoudre cette difficulté, on avance que le champ de la synchronie peut être envisagé en termes de corrélation de différentes systématicités et de diverses temporalités. Ce qui permet de concevoir quatre versions de la synchronie saussurienne : achronique, dynamique, opératoire et interprétative.In this paper, I will put forward a definition of synchrony based on Saussure’s leading idea of the linguistic consciousness of speaking subjects. According to André Jacob, however, this initial notion of synchrony suffers from a contradiction, implying at the same time different types of systematicity and temporality. In this respect, the field of synchrony can be reformulated in terms of the correlation of these two factors. It follows from that that there are four versions of the Saussurean synchrony : achronic, dynamic, operative and interpretative

« Les Sons justes pour l’éducation du peuple » : la création de l’écriture coréenne

L’article est consacré à la création de l’écriture coréenne. Il consiste dans l’étude du texte fondateur rédigé par le roi Say Cwong, « Les Sons justes pour l’éducation du peuple » (1443, 1446). Deux aspects essentiels sont dégagés : a) L’emprunt de l’écriture chinoise a réveillé la conscience phonétique de la langue coréenne et poussé à la création d’un système d’écriture adéquat à la structure phonétique de cette langue ; b) Trois principes ont été mis en œuvre dans cette création : principe de base, principe génératif, principe combinatoire ; nous montrons que que la philosophie orientale rejoint la phonétique moderne dans sa façon d’analyser les propriétés phonétiques des lettres : toutes deux proposent des modèles dichotomiques.The paper deals with the creation of Corean writing. It consists in the study of the inaugural text written by King Say Cwong, « Right sounds for the Instruction of the people ». Two major points are focused:a) The borrowing of Chinese writing awoke phonetic awareness of Corean language and impulsed the creating of a writing system that could be adequate to the phonetic structures of the latter language;b) That creation involves three principles, namely basic, generative, combinatory; we demonstrate that oriental philosophy and modern phonetics are congruent in the way they analyze the phonetic properties of letters: both propose dichotomical models

Où en est la synchronie, aujourd’hui ?

Dans cet article j’ai proposé de définir la synchronie à partir de l’idée directrice de Saussure, en termes de conscience linguistique des sujets parlants. D’après André Jacob, cette notion inaugurale de synchronie souffre d’une contradiction, à savoir qu’elle implique à la fois systématicité et temporalité. Pour résoudre cette difficulté, on avance que le champ de la synchronie peut être envisagé en termes de corrélation de différentes systématicités et de diverses temporalités. Ce qui permet de concevoir quatre versions de la synchronie saussurienne : achronique, dynamique, opératoire et interprétative.In this paper, I will put forward a definition of synchrony based on Saussure’s leading idea of the linguistic consciousness of speaking subjects. According to André Jacob, however, this initial notion of synchrony suffers from a contradiction, implying at the same time different types of systematicity and temporality. In this respect, the field of synchrony can be reformulated in terms of the correlation of these two factors. It follows from that that there are four versions of the Saussurean synchrony : achronic, dynamic, operative and interpretative

Sémiotique et sémantique

Comment définir la relation entre sémiotique et sémantique ? On dit que, alors que la sémantique concerne la signification linguistique, la sémiotique étend son objet d’étude jusqu’à des phénomènes significatifs non linguistiques. Cette position simpliste nous empêche de nous confronter à la complexité de la question. La relation entre sémiotique et sémantique, à mes yeux, est plus complexe et plus profonde qu’on ne le croit en général. Pour donner quelques éléments de réponse à cette question, je suis parti de l’hypothèse suivante : le sémantique est dans la sémiotique et le sémiotique est dans la sémantique. Et j’en dégage la conclusion suivante :– si le signifié est un élément constitutif du signe et que la sémiotique se définit comme science des signes, cette science a besoin d’une théorie sémantique pour la description sémantique.– comme science de la signification, la sémantique doit s’interroger sur le statut épistémologique, ontologique et méthologique de ce qu’on appelle signification. Pour formuler une réponse à cette question incontournable, elle est tenue de présupposer une structure du signe.How to define the relation between semiotics and semantics? One can say that semantics is only concerned with the linguistic meaning, while semiotics extends its research fields to the non-linguistic phenomena. It seems to me that this simple fact hides the complexity of the question. In fact their relation is more complex and more profound. To throw some light on the question, I began with the hypothesis that the semantic is in semiotics and the semiotic is in semantics. And I draw the conclusion as these:– if the signified is a constitutive part of sign and if semiotics is defined as science of signs, this science needs necessarily semantic theory.– as science of significations, semantics asks itself which ontological, epistemological, and methodological status should be accorded to what people call signification. In order to give an adequate answer to this question, it presupposes necessarily sign structure

Kinetic study for the optimization of ginsenoside Rg3 production by heat treatment of ginsenoside Rb1

AbstractBackgroundGinsenoside Rg3 is a promising anticancer agent. It is usually produced by heat treatment of ginseng, in which ginsenoside Rb1 is the major ginsenoside. A kinetic study was conducted to optimize ginsenoside Rg3 production by the heat treatment of ginsenoside Rb1.MethodsGinsenoside Rb1 was heated using an isothermal machine at 80°C and 100°C and analyzed using HPLC. The kinetic parameters were calculated from the experimental results. The activation energy was estimated and used to simulate the process. The optimized parameters of ginsenoside Rg3 production are suggested based on the simulation.ResultsThe rate constants were 0.013 h−1 and 0.073 h−1 for the degradation of ginsenosides Rb1 and Rg3 at 80°C, respectively. The corresponding rate constants at 100°C were 0.045 h−1 and 0.155 h−1. The estimated activation energies of degradation of ginsenosides Rb1 and Rg3 were 69.2 kJ/mol and 40.9 kJ/mol, respectively. The rate constants at different temperatures were evaluated using the estimated activation energies, and the kinetic profiles of ginsenosides Rb1 and Rg3 at each temperature were simulated based on the proposed kinetic model of consecutive reaction. The optimum strategies for producing ginsenoside Rg3 from ginsenoside Rb1 are suggested based on the simulation. With increased temperature, a high concentration of ginsenoside Rg3 is formed rapidly. However, the concentration decreases quickly after the reaching the maximal concentration value.ConclusionThe optimum temperature for producing ginsenoside Rg3 should be the highest temperature technically feasible below 180°C, in consideration of the cooling time. The optimum reaction time for heat treatment is 30 min

Dynamical mean-field theory of Hubbard-Holstein model at half-filling: Zero temperature metal-insulator and insulator-insulator transitions

We study the Hubbard-Holstein model, which includes both the electron-electron and electron-phonon interactions characterized by $U$ and $g$, respectively, employing the dynamical mean-field theory combined with Wilson's numerical renormalization group technique. A zero temperature phase diagram of metal-insulator and insulator-insulator transitions at half-filling is mapped out which exhibits the interplay between $U$ and $g$. As $U$ ($g$) is increased, a metal to Mott-Hubbard insulator (bipolaron insulator) transition occurs, and the two insulating states are distinct and can not be adiabatically connected. The nature of and transitions between the three states are discussed.Comment: 5 pages, 4 figures. Submitted to Physical Review Letter