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La doctrine du tourisme et son enseignement. La demande des services du tourisme s'étant accrue, la satisfaction en est devenue très compliquée aussi bien du point de vue d'organisation que du point de vue économique.

La coopération touristique internationale antérieure. Dans sa remarquable étude sur la «Théorie et pratique de la coopération économique internationale», le professeur Jacques‐A. L'Huillier, de l'Université de Genève, résume l'évolution de la coopération internationale comme suit: «Ce qui semble caractéristique de la collaboration économique internationale d'aujourd'hui, par opposition avec celle du passé, c'est d'être consciente, publique et multilatérale, et aussi d'intervenir dans des domaines proprement économiques, c'est‐à‐dire dans l'organisation des échanges et des paiements internationaux.»

Nombre de mots français évoquant l'accueil touristique tirent leurs racines du latin et sont, par là même, porteurs de symboles qui perdurent audelà des évolutions étymologiques.

Two‐noded curved beam elements, CMLC and IMLC, are developed on the basis of Timoshenko’s beam theory and curvilinear co‐ordinates. These elements are developed by the separation of the radial displacement into the bending and the shear deflection and the projection of the shear deflection into bending deflection. In the CMLC element, field‐consistent membrane strain interpolation is adapted for removing the membrane locking. The CMLC element shows the rapid and stable convergence on the wide range of radius, thickness and length of the curved beam. The field‐consistent membrane strain and the separation of radial displacement produce the most efficient linear element possible.

Wolverine hairs with superior heat transfer properties have been used as fur ruffs for extreme cold-weather clothing. In order to understand the exclusive mechanism of wolverine surviving in the cold areas of circumpolar, the purpose of this paper is to establish a one-dimensional fractional heat transfer equation to reveal the hidden mechanism for the hairs, and also calculate the fractal dimension of the wolverine hair using the box counting method to verify the proposed theory. The observed results (from the proposed model) found to be in good agreement with the box counting method. This model can explain the phenomenon which offers the theoretical foundation for the design of extreme cold weather clothing.

The authors calculated the fractal dimension of the wolverine hair using the box counting method to verify the proposed theory. The observed results (from the proposed model) found to be in good agreement with the box counting method.

The box counting method proves that the theoretical model is applicable.

The authors propose the first heat transfer model for the wolverine hair.

The purpose of this paper is to carry out a theoretical study of the stability of the mathematical models defined in a class of systems. Furthermore, it will be supposed that the models have been obtained from experimental data and by means of the application of a methodology. The studies carried out in this paper are, on one hand, the theoretical framework for an analysis of the sensitivity and stability of a type of systems; on the other hand, they supplement the studies carried out by the authors, in which, using a computational program, the sensitivity of the mathematical models is analyzed with respect to a type of perturbation.

Initially, a class of systems is considered that are denominated quantifiable systems, in which model systems are defined that are determined by a set and a family of relationships. An initial study of the sensitivity of the mathematical models to perturbations in the experimental data lead to a concept of sensitive and stable models that forms the basis of the theory of stability developed in this paper. Furthermore, this permits a definition of the stability function for the set of the perturbations and, consequently, a determination of stable models according to the defined theoretical structure.

An analysis of the sensitivity and stability of mathematical models in quantifiable systems from a systems theory perspective will be fundamental for the determination of mathematical model stability in environmental systems.

The studies carried out in this paper supposes an advance in the study and modeling of a type of systems that the authors have denominated as quantifiable systems, applicable to the study of environmental systems and supplementing the numeric studies carried out by the authors.

Tourism and airtransport, although mass tourism was possible by other transports facilities, the great step forward was put with developments in airtransport.

A main exhibit on Baird & Tatlock's stand will be the Brookfield digital viscometer, which is claimed to represent a real advancement in routine laboratory measurement of viscosity. For years the non‐digital Brookfield was used in laboratories worldwide as a fast and accurate means of quality control and for research purposes. The introduction of the digital version gives extra convenience and accuracy to the determination of viscosity. The important features of the digital version are:

The calculation of quasistationary magnetic fields and electrostatic fields of several objects is presented in the paper. In the range of the magnetic fields of coils and transformer systems parallelepiped calculation regions are assumed. In the range of electrostatic fields analysis of the field in tanks of different shape storing inflammable liquids was undertaken. Fast subroutines using finite differences [FDM] to calculate the field were employed. These subroutines are based on the Fast Fourier Transform (FFT).

Le loisir et son utilisation constituent un champ privilégié favorable au développement de certaines des oppositions sociales les plus aigues dont notre temps soit le témoin. Nous avons démontré ailleurs combien par exemple la capacité donnée à un nombre sans cesse croissant d'êtres humains de se projeter dans l'espace des loisirs, impliquait pour les populations occupant cet espace de retombées négatives et de réactions hostiles.