Photonic realization of the relativistic Dirac oscillator

A photonic realization of the Dirac oscillator (DO), i.e. of the relativistic extension of the quantum harmonic oscillator, is proposed for light propagation in fiber Bragg gratings. Transmission spectra clearly show the existence of electron and positron bound states of the DO, corresponding to resonance modes above and below the Bragg frequency, as well as the asymmetry of the energy spectrum for electron and positron branches

Domestication De Thunbergia Atacorensis Akoegninou & Lisowski (Acanthaceae) : Effet Du Type De Substrat Et Du Mode D’eclairement Sur L’aptitude A La Reprise Vegetative Des Boutures Et La Croissance Des Plants

We studied the possibility of producing seedlings of Thunbergia atacorensis (Acanthaceae) starting from cuttings under controlled cultivation conditions during 3 months. The objective of this work is to determine the optimal conditions for seedling production Thunbergia atacorensis by vegetative reproduction to allow its extension from professional growers and amateur (consumers). The study consisted to analyze their effect the plant growth, seedlings development, and leaves production. At the end the study, we obtained a rate of 91p.c for vegetative recovery for the cutting in shade 97p.c. for the cutting exposing to sun. However, the cuttings exposed sun clearly dissociates cuttings exposed to the shade with a shorter time of recovery. At the end of 3 months, only the sunny seedlings survive despite of the recovery rate of recovery. The study showed that the four environmental factors, the mode of exposure (sun and shade) and time (weeks) have a significant influence on the height and the number of seedlings leaves. The highest seedlings are observed in the shade from weeks 1 to 3. From week 3, only the sunny seedlings continue their growth and their development. The variation of the substrate and the frequency of watering, meanwhile, had no significant influence on the height and number of leaves. In sum, despite of lack of flowering, to produce seedlings of Thunbergia atacorensis, one should initially carry out the propagation by cutting in the shade and then to gradually intensify the light to have well developed seedlings

Diversité et Connaissance Ethnobotanique des Espèces de la Famille des Acanthaceae de la Réserve Naturelle Partielle de Dahliafleur, Côte d’Ivoire

This paper focuses on carrying out the biological variety of Acanthaceae and their ethnobotanical interest for the population around the Partial Nature Reserve of Dahliafleur (PNRDF). First, the main goal of this study is to contribute to the knowledge of species of Acanthaceae family and secondly to food, medicine, and ornament for the population around the PNRDF. A botanical inventory was conducted at the PNRDF, followed by an ethnobotanical investigation carried out around the reserve. The study of the flora recorded about 318 species of plants as a whole. A total of 7 species (2.50%) belonging to the family of Acanthaceae distributed in 5 genders were also recorded. The outcome of the investigation around the PNRDF revealed that from a total of 7 species, 4 out of them are essentially used by people in the ornamentation, pharmacopoeia, and in food. These species are Justicia flava, Justicia secunda, Thunbergia erecta, and Thunbergia grandiflora. The knowledge of the population on the use of each species changes from one group to another. The impartial index of the investigation revealed that the vegetal species are not evenly distributed (IE < 0.5). Women usually occupy the top place in regards to the knowledge of this plant. The most important in terms of the cultural value for the population are Justicia secunda (1.87) and Justicia flava (1.61). This study is therefore a sketch for the valorization of these plant species for their preservation or extension.La présente étude porte sur la diversité biologique des Acanthaceae et leur intérêt ethnobotanique pour les populations autour de la Réserve Naturelle Partielle de Dahliafleur (RNPDF). L'objectif principal de cette étude est de contribuer à la connaissance d’une part des espèces de la famille des Acanthaceae et d’autre part de dégager leur importance alimentaire, médicinale et ornementale pour la population autour de la RNPDF. Un inventaire botanique a été conduit dans la RNPDF, suivi d’une enquête ethnobotanique réalisée aux alentours de cette réserve. L’étude de la flore a permis de recenser 318 espèces de plantes dans l’ensemble. Un total de 7 sur 318 espèces soit 2,50 % appartenant à la famille des Acanthaceae réparties en 5 genres ont été recensées. Il ressort de l’enquête ethnobotanique menée aux alentours de la RNPDF que sur 7 espèces recensées, 4 sont essentiellement utilisées par l’homme dans l’ornementation, la pharmacopée et l’alimentation. Ces espèces sont Justicia flava, Justicia secunda, Thunbergia erecta et Thunbergia grandiflora. Le niveau de connaissance de la population sur l’usage de chacune de ces espèces varie d'un groupe à un autre. Les indices d’équitabilité des enquêtés révèlent que ces connaissances sur ces espèces végétales ne sont pas uniformément réparties (IE < 0,5). Ce sont les femmes qui occupent une place de choix dans la détention des connaissances sur ces plantes. Les plus importantes en terme de valeur culturel pour les populations sont Justicia secunda (1,87) et Justicia flava (1,61). Cette étude constitue donc une ébauche pour la valorisation de ces espèces végétales en vue de leur sauvegarde ou de leur vulgarisation

Small-scale wave energy converter for wave tank facility

A small-scale wave energy converter was designed and built for teaching and academic purposes to be used at The Division for Electricity, in the Ångström Laboratory at Uppsala University. The design of the power take-off (PTO) makes use of magnets passing through a copper coil for electricity generation. The magnets are attached by a string to the floating buoy in the small-scale wave tank which leads to a joint oscillation. Design parameters are executed using COMSOL Multiphysics which illustrates the total voltage output generated as well as the total magnetic field. Simulations and calculations in MATLAB were performed to extract the expected damping coefficient and plots of the buoy position compared to the wave amplitude. Lastly, a PTO prototype were built and compared with the simulations. The PTO shows electricity generation with the aid of a voltmeter showcasing the voltage. Additional information on future improvements to further aid teaching and academic understanding of wave energy converter are mentioned in the final section of this study

Small-scale wave energy converter for wave tank facility

A small-scale wave energy converter was designed and built for teaching and academic purposes to be used at The Division for Electricity, in the Ångström Laboratory at Uppsala University. The design of the power take-off (PTO) makes use of magnets passing through a copper coil for electricity generation. The magnets are attached by a string to the floating buoy in the small-scale wave tank which leads to a joint oscillation. Design parameters are executed using COMSOL Multiphysics which illustrates the total voltage output generated as well as the total magnetic field. Simulations and calculations in MATLAB were performed to extract the expected damping coefficient and plots of the buoy position compared to the wave amplitude. Lastly, a PTO prototype were built and compared with the simulations. The PTO shows electricity generation with the aid of a voltmeter showcasing the voltage. Additional information on future improvements to further aid teaching and academic understanding of wave energy converter are mentioned in the final section of this study