Consumer Perception of Vegetables Resulting From Conventional Field or Greenhouse Agricultural Methods

This survey studies the way in which French consumers perceive fruits and vegetables, be they local, domestic or imported, resulting from conventional field or greenhouse agricultural methods, in terms of a health and hedonic, then a sustainability, point of view. The method employed, focus groups with individual questionnaires and the use of real-to-life scenarios, allows to get findings concerning the knowledge of the various cultivation methods, attitudes concerning these various methods, the role of information, to expose three representational profiles and, the results of the producer scenario, distributor scenario and consumer scenario study. On a general level, this study brings to light the negative image associated with greenhouse growers but consumer perception varies according to the representational profiles (Traditionalists, Spendthrifts and Responsible). ...French Abstract : Cette étude s'intéresse à la façon dont les consommateurs français perçoivent les fruits et légumes, locaux, nationaux ou importés, issus de l'agriculture conventionnelle ou de production sous serre, du point de vue de la santé, des aspects hédoniques et de la durabilité. Des focus groups complétés par des questionnaires individuels et par une étude de scénarios ont permis de mettre en évidence les niveaux de connaissance et les attitudes concernant les différentes méthodes de production, le rôle de l'information, de présenter trois profils de représentation et les réponses des consommateurs face aux scénarios producteur, distributeur et consommateur. De façon générale, cette étude montre que l'image associée à la production sous serre est négative, mais les perceptions varient selon les profils de représentations (Traditionalistes, Economes, Responsables).SUSTAINABILITY; CONSUMER; FOOD CONSUMPTION; SCENARIOS METHOD; FOCUS GROUPS; AGRICULTURAL PRODUCTION METHODS; DURABILITE; CONSOMMATEUR; CONSOMMATION ALIMENTAIRE; METHODE DES SCENARIOS; METHODES DE PRODUCTION AGRICOLES

Topological defects and misfit strain in magnetic stripe domains of lateral multilayers with perpendicular magnetic anisotropy

Stripe domains are studied in perpendicular magnetic anisotropy films nanostructured with a periodic thickness modulation that induces the lateral modulation of both stripe periods and inplane magnetization. The resulting system is the 2D equivalent of a strained superlattice with properties controlled by interfacial misfit strain within the magnetic stripe structure and shape anisotropy. This allows us to observe, experimentally for the first time, the continuous structural transformation of a grain boundary in this 2D magnetic crystal in the whole angular range. The magnetization reversal process can be tailored through the effect of misfit strain due to the coupling between disclinations in the magnetic stripe pattern and domain walls in the in-plane magnetization configuration

Restrictions on the coherence of the ultrafast optical emission from an electron-hole pairs condensate

We report on the transfer of coherence from a quantum-well electron-hole condensate to the light it emits. As a function of density, the coherence of the electron-hole pair system evolves from being full for the low density Bose-Einstein condensate to a chaotic behavior for a high density BCS-like state. This degree of coherence is transfered to the light emitted in a damped oscillatory way in the ultrafast regime. Additionally, the photon field exhibits squeezing properties during the transfer time. We analyze the effect of light frequency and separation between electron and hole layers on the optical coherence. Our results suggest new type of ultrafast experiments for detecting electron-hole pair condensation.Comment: 4 pages,3 figures, to be published in Physical Review Letters. Minor change