Paletou, Frédéric

Cette revue vise à clarifier les origines des célèbres relations dites de Eddington–Barbier, incontournables dans le domaine du transfert de rayonnement astrophysique. Ces dernières relient, en effet, respectivement l'intensité spécifique et le flux émergents à la valeur de la fonction source à des profondeurs optiques spécifiques dans l'atmosphère...

Crocco, Gabriella Van Atten, Mark Cantu, Paola Engelen, Eva-Maria

This work presents the first complete German transcription of the Max Phil X notebook of Kurt Gödel, offered in an open access version to the scholars of the Gödelian community. The original notebook was written in Gabelsberger from March 1943 to January 1944 and it belongs to a series of fifteen notebooks. Some excerpts of these notebooks were tra...

Nattermann, T.

A low temperature calculation for the incommensurate-commensurate transition in a system with a single axis of modulation is performed. The theory is formulated in terms of wall and phonon degrees of freedom. Phonons renormalize the domain wall interaction to larger values. By means of a simple self-consistent calculation scheme the square root law...

Viénot, Françoise

Cone fundamentals is the name given to the relative spectral sensitivity of long-wave sensitive, medium-wave sensitive and shortwave sensitive cones. Cone fundamentals represent the spectral absorptances of the retinal photopigments in the cones multiplied by the spectral transmittances of the ocular media through which light passes to reach the re...

Sherbon, Michael

An introduction is given to the geometry and harmonics of the Golden Apex in the Great Pyramid, with the metaphysical and mathematical determination of the fine-structure constant of electromagnetic interactions. Newton's gravitational constant is also presented in harmonic form and other fundamental physical constants are then found related to the...

Viénot, Françoise Brettel, Hans

The generic framework of metamerism implies that the number of sensors is smaller than the dimension of the stimulus. The metameric black paradigm was introduced by Wyszecki [Farbe 2, 39 (1953)] and developed by Cohen and Kappauf [Am. J. Psychol. 95, 537 (1982)]. Within a multireceptor and multiprimary scheme, we investigate how far the choice of i...

Comte, C. Nozières, P.

We consider an electron-hole gas in a simple model semiconductor, with direct gap and isotropic, non degenerate bands. We study the Bose condensed ground state of that system as a function of density, using a mean field variational ansatz. In a first stage, we ignore screening as well as the spin structure of the carriers. We thus describe the smoo...

Dias, Ricardo Lopes Dos Santos, J. M. B.

We have constructed an exact map of the U↦∞ one dimensional Hubbard Hamiltonian onto a system of free fermions related to the charge degrees of freedom (holons). The spin configuration only influences the energy in so far as the fermions move in a loop which is threaded by a fictitious magnetic flux proportional to the spin configuration's total mo...

Viénot, Françoise Brettel, Hans Dang, Tuong-Vi Le Rohellec, Jean

Any stimulus can be described as composed of two components—a fundamental color stimulus that controls the three cone responses and a metameric black that has no effect on cones but can drive photoreceptors other than cones [e.g., rods and melanopsin expressing retinal ganglion cells (ipRGCs)]. The Cohen and Kappauf [Am. J. Psychol. 95, 537 (1982)]...

Delporte, Céline Ben Chouikha, Mohamed Sautrot, Sylvie Viénot, Françoise Alquié, Georges

In order to build biological tissues spectral characteristics database to be used in a multispectral imaging system a tissues optical characterization bench is developed and validated. Several biological tissue types have been characterized in vitro and ex vivo with our device such as beef, turkey and pork muscle and beef liver. Multispectral image...