LES ECOULEMENTS TURBULENTS SONT FREQUEMMENT SOUMIS AUX EFFETS DE LA ROTATION. DES OBSERVATIONS GEOPHYSIQUES, AINSI QUE DES EXPERIENCES DANS LE LABORATOIRE, MONTRENT QUE POUR DES TAUX DE ROTATION MODERES LES TOURBILLONS DONT LA VORTICITE EST PARALLELE ET DE MEME SIGNE QUE LA ROTATION (TOURBILLONS CYCLONIQUES) SONT TOUJOURS RENFORCES, TANDIS QUE CEUX DE SIGNE CONTRAIRE (TOURBILLONS ANTICYCLONIQUES) SONT DETRUITS. CEPENDANT, POUR DE GRANDS TAUX DE ROTATION, LES TOURBILLONS CYCLONIQUES ET ANTICYCLONIQUES SONT BIDIMENSIONNALISES (THEOREME DE TAYLOR-PROUDMAN). CE TRAVAIL ETUDIE L'INFLUENCE D'UNE ROTATION SOLIDE SUR LE DEVELOPPEMENT DES INSTABILITES ET DES TOURBILLONS COHERENTS DANS LES ECOULEMENTS CISAILLES LIBRES (COUCHE DE MELANGE ET SILLAGE PLAN). DEUX APPROCHES ONT ETE UTILISEES: SIMULATION NUMERIQUE, ET THEORIE LINEAIRE DE L'INSTABILITE HYDRODYNAMIQUE. LES RESULTATS DES SIMULATIONS NUMERIQUES DIRECTES DES EQUATIONS DE NAVIER-STOKES INCOMPRESSIBLES ONT CONFIRME LES OBSERVATIONS: STABILISATION DES TOURBILLONS CYCLONIQUES, DESTABILISATION DES ANTICYCLONES POUR DES TAUX DE ROTATION MODERES, ET BIDIMENSIONNALISATION DES TOURBILLONS CYCLONIQUES ET ANTICYCLONIQUES POUR DE GRANDS TAUX DE ROTATION. EN OUTRE, ELLES ONT AUSSI MONTRE QUE LA DESTABILISATION DES TOURBILLONS ANTICYCLONIQUES ENTRAINE LA FORMATION DE TOURBILLONS LONGITUDINAUX CONTRAROTATIFS INTENSES. CES TOURBILLONS ONT ETE OBSERVES DANS LES ECOULEMENTS CISAILLES CONFINES TOURNANTS ET PRESENTENT DES ANALOGIES AVEC LES TOURBILLONS DE GORTLER DANS UNE COUCHE LIMITE CONCAVE. LA RESOLUTION DE L'EQUATION D'ORR-SOMMERFELD CONFIRME QUE LES MODES LES PLUS INSTABLES, POUR UNE ROTATION ANTICYCLONIQUE MODEREE, SONT DES MODES LONGITUDINAUX: LA LONGUEUR D'ONDE SUIVANT L'ENVERGURE DES TOURBILLONS LONGITUDINAUX OBSERVES DANS LES SIMULATIONS NUMERIQUES TRIDIMENSIONNELLES EST EN BON ACCORD AVEC LES PREDICTIONS DE LA THEORIE DE LA STABILITE LINEAIRE. L'ANALYSE DES RESULTATS A LA LUMIERE D'UNE THEORIE BASEE SUR LE THEOREME DE KELVIN EN MILIEU TOURNANT MONTRE QUE CES TOURBILLONS LONGITUDINAUX RESULTENT DE L'ETIREMENT DE FILAMENTS VORTEX DE FAIBLE VORTICITE ABSOLUE

This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

The book "Wind Tunnels and Experimental Fluid Dynamics Research" is comprised of 33 chapters divided in five sections. The first 12 chapters discuss wind tunnel facilities and experiments in incompressible flow, while the next seven chapters deal with building dynamics, flow control and fluid mechanics. Third section of the book is dedicated to chapters discussing aerodynamic field measurements and real full scale analysis (chapters 20-22). Chapters in the last two sections deal with turbulent structure analysis (chapters 23-25) and wind tunnels in compressible flow (chapters 26-33). Contributions from a large number of international experts make this publication a highly valuable resource in wind tunnels and fluid dynamics field of research.

Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.

The General Assembly of the International Union of Theoretical and Applied Mechanics in its meeting on August 28, 1994, selected for 1996 only four Mechanics Symposia, of which ours is the only one related to Fluid Mechanics: Variable Density Low Speed Turbulent Flows. This IUTAM Symposium, organized by the Institut de Recherche sur les Phenomenes Hors Equilibre (Marseille), is the logical continuation of the meetings previously organized or co-organized - on the French or European level, such as Euromech 237, Marseille, 1988 - by the same research group ofMarseille. This meeting focused specifically on the structure of turbulent flows in which density varies strongly : the effect of this variation on the velocity and scalar fields is in no sense negligible. We were mainly concerned with low-speed flows subjected to strong local changes of density as a consequence of heat or mass transfer or of chemical reactions. Compressible turbulent flows - such a!" supersonic ones - were also considered in order to underline their similarities to and their differences from low-speed variable density flows.

Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.