Search results for "Fora"
showing 10 items of 1086 documents
Les droits des propriétaires forains dans la forêt communale de Givry au XVIIIe siècle
2008
Metáforas rebeldes : espacio y tiempo en discursos insurgentes de Guatemala y Chiapas
2007
International audience
Recent developments in the acoustical properties of perforated and porous materials containing dead-end pores
2017
It was shown recently in Nevers, France, Sherbrooke, Canada and Salford, UK, that porous materials with semi-opened pores or materials with open pores bearing lateral cavities or resonators at the microscopic scale of the pores can result in peculiar sound absorption properties. Various examples of these materials can be found in engineering and in everyday life including bio-based materials. The cavities and resonators can be assimilated to dead-end pores, which are opened at one end and closed at the other. The dead-end pores are known to geophysicists. We studied them more recently in the field of engineering acoustics where the saturating fluid is air. The closed ends prevent the fluid …
Acoustical properties of air-saturated porous material with periodically distributed dead-end pores
2015
International audience; A theoretical and numerical study of the sound propagation in air-saturated porous media with straight main pores bearing lateral cavities (dead-ends) is presented. The lateral cavities are located at " nodes " periodically spaced along each main pore. The effect of periodicity in the distribution of the lateral cavities is studied, and the low frequency limit valid for the closely spaced dead-ends is considered separately. It is shown that the absorption coefficient and transmission loss are influenced by the viscous and thermal losses in the main pores as well as their perforation rate. The presence of long or short dead-ends significantly alters the acoustical pro…
Acoustic properties of plates with unevenly distributed macro perforations backed by woven meshes
2012
A hybrid model describing the acoustic properties of plates with macro-perforations that can be unevenly distributed on the plate surface and backed by woven or precision woven meshes with microscopic perforations is proposed. The plate perforations may be of circular or rectangular shapes. Since the perforated plate may not necessarily be considered as an equivalent fluid, its surface impedance is calculated by the Maa model [Noise Control Eng. J. 29, 77-84 (1987)], whereas the Johnson-Champoux-Allard model [J. Appl. Phys. 70, 1975-1979 (1991)] is used for the mesh. It is observed that the absorption of the carrying plate seems to depend on the hydraulic diameter of the perforations and no…
On the measurement and prediction of the sound absorption coefficient of air-cavity backed perforated plates considering the holes interaction effect…
2012
International audience; This paper deals with the measurement and prediction of air cavity backed perforated plates considering the holes interaction effect under relatively low sound excitation. A revised expression for the radiation contribution is proposed to properly account for the holes interaction effect. This expression is integrated in the characteristic impedance expression following Atalla and Sgard [J. Sound Vib. 303, 195-208 (2007)] model. Perforated plate specimens with different centre-to-centre holes distances (pitches) are built and tested using an impedance tube. The particular cases of holes interaction effect with constant low porosity and of holes interaction effect wit…
Sound absorption coefficient of a porous material covered with a low open area perforated plate under high sound excitation
2012
International audience; The sound absorption coefficient of porous materials covered with low open area perforated plate is studied under high sound intensities in the absence of mean flow. The theoretical considerations are based on the equivalent fluid following the Johnson-Champoux-Allard approach and the use of the transfer matrix method. To take into account the high sound levels effects, the air flow resistivity of each layer is modified following the Forchheimer law. Two specimens of perforated plate are built and tested when backed by a polymeric foam and a fibrous material. A specific impedance tube setup is developed for the measurement of the surface acoustic impedance for sound …
Noguruma ietekme uz metaforu uztveri un acu kustībām lasīšanas uzdevumos
2015
Bakalaura darbs ir uzrakstīts latviešu valodā, datorsalikumā uz 36 lapām. Tas satur 13 attēlus, 8 tabulas, 23 atsauces uz literatūras avotiem. Darba mērķis ir izpētīt raksturīgās acu kustības un noguruma ietekmi uz metaforu uztveri lasīšanas uzdevumos. Darba uzdevumi: (1) salīdzināt fiksācijas ilgumus un regresiju skaitu 3 lasīšanos uzdevumos ar metaforām; (2) novērtēt teksta izpratni; (3) novērtēt noguruma ietekmi uz acu kustībām lasīšanas uzdevumos. Eksperimentā piedalījās 16 studenti: 14 sievietes un 2 vīrieši ar labu redzi tuvumā; Metode: Uz datora ekrāna tika demonstrēti stimuli ar sarežģītām, vienkāršām un bez metaforām. Acu kustības tika ierakstītas ar iView XTM Hi-Speed iekārtu. Dat…
Legumes in 21st century Europe: present and future importance in agri-food systems? New challenges for reseach.
2013
Intensification of agriculture since 1950 has globally led to the decline of grain legume crops, which currently represent less than 3 % of arable crops in France and Europe. Nevertheless, legumes have several major assets (i) as plant proteins for animal feed and human food and (ii) as plants fixing atmospheric N2 and thereby saving nitrogen inputs in cropping systems, and (iii) as diversification crops. The analysis of forage and grain legume producing systems in France showed that the dominant system results in a lock-in of the different factors limiting legume insertion into the current systems. But legumes could have a major role to play in the agroecological transition towards more su…
Kirjoittajan minä-ilmaisujen hyödyntäminen osana hoitoprosessia : vähänpuheisen pojan ainekirjoitusten avulla luodaan ymmärrystä hänelle itselle ja a…
2017
Tämä pro gradu -tutkielma on tapaustutkimus, jossa tarkastellaan lastensuojelusijaishuollon ja psykiatrian asiakkaana olevan pojan ainekirjoituksissa ilmenevien minä-ilmaisujen avulla, mitä ja miten hän kertoo itsestään ja suhteistaan toisiin. Pro gradu -tutkielmassa pyrittiin selvittämään, diskurssianalyyttisiä keinoja hyödyntäen, millaisia voimavaroja kirjoittaja teksteissään hänestä itsestään tuottaa sekä millä tavalla kirjoittaja korvaa kirjoituksillaan kyvyttömyyttään puhua ja mitä merkityksiä ainekirjoituksista, joissa kirjoittaja kuvaa itseään tai omaa toimintaansa tulee esiin. Keskeisimmät tutkimustulokset olivat, tarinallinen metafora, jonka avulla poika saattoi kirjoittaa oman elä…