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Literatura académica sobre el tema "Effets d'échantillonnage"
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Artículos de revistas sobre el tema "Effets d'échantillonnage"
ABAKAR MOUSSA, Moustapha y RECEP YILMAZ. "Impact de la quatrième révolution industrielle sur les auditeurs indépendants et les pratiques d'audit". Journal of Academic Finance 14, n.º 2 (30 de diciembre de 2023): 79–98. http://dx.doi.org/10.59051/joaf.v14i2.700.
Texto completoVerneaux, V. y L. Aleya. "Comparaison des peuplements chironomidiens du lac de l'Abbaye obtenus par différentes méthodes d'échantillonnage. Intérêts de la récolte des exuvies nymphales". Revue des sciences de l'eau 12, n.º 1 (12 de abril de 2005): 45–63. http://dx.doi.org/10.7202/705343ar.
Texto completoOdanga, Sylvester JO, Peter JO Aloka y Pamela Raburu. "Effects of Experience on Teachers’ Self-Efficacy in Secondary Schools". Alberta Journal of Educational Research 68, n.º 1 (10 de marzo de 2022): 119–32. http://dx.doi.org/10.55016/ojs/ajer.v68i1.70744.
Texto completoBruce, SG, ND Riediger y LM Lix. "Maladies chroniques et facteurs de risque chez les membres des Premières Nations, les Inuits et les Métis du Nord canadien". Maladies chroniques et blessures au Canada 34, n.º 4 (noviembre de 2014): 229–37. http://dx.doi.org/10.24095/hpcdp.34.4.04f.
Texto completoPinel-Alloul, B., N. Bourbonnais y F. Pick. "Variations spatiotemporelles des compartiments autotrophes et hétérotrophes de la boucle microbienne dans les lacs du sud du Québec". Revue des sciences de l'eau 15, n.º 1 (12 de abril de 2005): 3–25. http://dx.doi.org/10.7202/705432ar.
Texto completoEsiegwu, A. C. y R. D. Ejike. "Effects of covid-19 on poultry production in south-east agro-ecological zone of Nigeria". Nigerian Journal of Animal Production 48, n.º 4 (8 de marzo de 2021): 253–61. http://dx.doi.org/10.51791/njap.v48i4.3003.
Texto completoOlaniyi, W. A. "The proposed Eko Atlantic City project, Victoria Island, Lagos: Preliminary impact assessment of land reclamation on the aquatic lives and climate change". Nigerian Journal of Animal Production 48, n.º 4 (8 de marzo de 2021): 194–200. http://dx.doi.org/10.51791/njap.v48i4.3014.
Texto completoGirard, P., J. Y. Brana y J. F. Fruget. "Surveillance sanitaire estivale des populations piscicoles du Rhône au voisinage du Centre Nucléaire de Production d'Électricité (CNPE) du Tricastin. Synthèse 2008–2013". Hydroécologie Appliquée 20 (28 de abril de 2017): 103–29. http://dx.doi.org/10.1051/hydro/2016003.
Texto completoAdereti, F. O., I. O. Ibitunde y S. O. Adedeji. "Perception of farmers on the effect of climate change on poultry production in Osun State, Nigeria". Nigerian Journal of Animal Production 48, n.º 4 (8 de marzo de 2021): 1–8. http://dx.doi.org/10.51791/njap.v48i4.2988.
Texto completoRekwot, Z. G., O. Oyinbo y N. P. Achi. "Poverty reduction among beef cattle value chain actors in North-West zone of Nigeria". Nigerian Journal of Animal Production 48, n.º 6 (18 de enero de 2022): 363–73. http://dx.doi.org/10.51791/njap.v48i6.3324.
Texto completoTesis sobre el tema "Effets d'échantillonnage"
Anakok, Emre. "Prise en compte des effets d'échantillonnage pour la détection de structure des réseaux écologiques". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASM049.
Texto completoIn this thesis, we focus on the biases that sampling can cause on the estimation of statistical models and metrics describing ecological interaction networks. First, we propose to combine an observation model that accounts for sampling with a stochastic block model representing the structure of possible interactions. The identifiability of the model is demonstrated and an algorithm is proposed to estimate its parameters. Its relevance and its practical interest are attested on a large dataset of plant-pollinator networks, as we observe structural change on most of the networks. We then examine a large dataset sampled by a citizen science program. Using recent advances in artificial intelligence, we propose a method to reconstruct the ecological network free from sampling effects caused by the varying levels of experience among observers. Finally, we present methods to highlight variables of ecological interest that influence the network's connectivity and show that accounting for sampling effects partially alters the estimation of these effects. Our methods, implemented in either R or Python, are freely accessible
Quinn, Philip. "Quantification de minéraux dans des comprimés pharmaceutiques de multivitamines par XRF et LIBS". Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6720.
Texto completoSamalens, Jean-Charles. "Stratégies d'échantillonnage des dommages forestiers à l'échelle du paysage : application aux forêts cultivées de pin maritime (Pinus pinaster, Aït.)". Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR12361/document.
Texto completoForest ecosystem health assessment relies on long-term and multiple scales sampling strategies. Neither European networks of permanent plots developed empirically, nor local observation protocols can produce reliable estimates of forest damages over areas ranging from a few hundred to several thousands of hectares. Little attention has been paid to the development of robust sampling designs at the landscape scale, which is however the operational one for forest management. Three criteria were considered to optimize the performance of forest damage sampling: landscape features, variability estimates at different spatial scales and logistics costs of observations. Intensive monitoring was performed on two landscapes of maritime pine plantation forests. Nonparametric statistics (bootstrap, geostatistical simulations) and spatial statistics were used to optimize allocation of sampling effort within nested sampling designs. Firstly, the monitoring of all types of forest damage (biotic or abiotic) was investigated through the optimization of sampling schemes currently applied at the national scale (European Network - ICP forest level I and National Forest Inventory). Then, specific sampling strategies were developed for two insect pests (the defoliator Thaumetopoea pityocampa and the bark beetle Ips sexdentatus), taking into account the spatial distribution of their damage. Increasing the sampling density of national plot networks up to 1/700 ha would be necessary for forest damage survey at the landscape scale. The optimal configuration of inventory plots lies in the observation of about 25 trees, selected without discrimination of social status and partly integrating trees at stand edges (20%). At a large scale, only populations of T. pityocampa showed a spatial structure over several kilometers. A systematic sampling plan, with a square grid between 2 km and 3 km, seems to be a good compromise for estimation and mapping of its nest density. However, systematic plot networks are inadequate for assessing rare and spatially clustered phenomenon such as damage caused by bark beetles damages. A retrospective post-storm 1999 survey of I.sexdentatus damages emphasizes the effectiveness of an adaptive roadside sampling method to monitor this type of damage. The use of forest edges as "sentinel trees" seems promising and its practical applications are proposed for forest health monitoring at the landscape scale
Merian, Pierre. "Variations spatio-temporelles de la réponse au climat des essences forestières tempérées : quantification du phénomène par approche dendroécologique et influence de la stratégie d'échantillonnage". Phd thesis, AgroParisTech, 2012. http://pastel.archives-ouvertes.fr/pastel-00764526.
Texto completoStoeckel, Solenn. "Impact de la propagation asexuée et du système d'auto-incompatibilité gamétophytique sur la structuration et l'évolution de la diversité génétique d'une essence forestière entomophile et disséminée, Prunus avium L". Phd thesis, ENGREF (AgroParisTech), 2006. http://pastel.archives-ouvertes.fr/pastel-00002599.
Texto completoTenailleau, Quentin. "Multi-exposition en milieu urbain : approche multi-echelle de l'exposition humaine au bruit et à la pollution atmosphérique". Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2052/document.
Texto completoEvery day, 15% of the European population is exposed to average noise or air pollution levels exceeding theEuropean legal threshold. Levels and distribution of each pollutant across the city depend of individual sourcesemissions, dispersion phenomenon, and urban environment. Consequently, spatial variability of multi-exposure levelremains mostly unknown. The aim of this Ph. D. thesis is to identify and describe multi-exposure situations in the cityof Besançon. Environmental noise levels, and concentrations of several air pollutants (NO2, benzene, PM10 and PM2.5),have been modeled using a fine scale grid (2m x 2m). Model compatibility has been maximized by the use of commoninput into the calculation software Mithra-SIG (for noise) and COPERT4/ADMS-urban (for air pollutants). In a firsttime, impact of the neighborhood definition on exposure levels has been explored for both pollutions. Twelveindicators, each representing a different definition of the exposure area in the dwelling vicinity, have been used toquantify exposure levels around the 10 865 inhabitable building of Besançon. Obtained results show a significantimpact of the neighborhood definition on the exposure levels. Different neighborhood definitions lead to a differentialbias caused by a different accounting for environmental variables. This bias exists for all studied pollutant, but indifferent proportion depending on the pollutant. In a second time, situations of multi-exposure to noise and NO2 havebeen identified in the city. Results indicate a complex relation between pollutants and allow the description of severalmulti-exposure situations across the city. This work constitute one of the firsts approaches of this kind in France andallow a better understanding of the existing relations between neighborhood, exposure area, environmental parametersand exposure levels
Jouette, Christian. "Conception d'un appareil de mesure du débit sanguin tissulaire par effet doppler optique : choix des paramètres d'échantillonnage et d'analyse spectrale, et détermination d'un indice débit métrique". Nancy 1, 1994. http://www.theses.fr/1994NAN10106.
Texto completoDelsinne, Thibaut. "Structure des assemblages de fourmis le long d'un gradient d'aridité situé dans le Chaco sec paraguayen". Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210665.
Texto completoObjectifs: Les principaux buts de la thèse sont (1) de déterminer l’influence de l’aridité et des conditions édaphiques sur la distribution et la structure des assemblages de fourmis terricoles du sol en forêts tropicales sèches, (2) mettre en évidence les mécanismes qui facilitent la coexistence des espèces de fourmis à l’échelle locale, (3) déterminer si à l’échelle régionale les fourmis et les plantes répondent de façon similaire aux conditions du milieu.
Méthode: Onze localités ont été échantillonnées le long d’un transect régional long de 400km. Au niveau de chaque localité, trois transects élémentaires longs de 200m et séparés les uns des autres par 200m ont été effectués. La myrmécofaune a été échantillonnée à l’aide de 20 pièges à fosse et de 20 Winkler par transect élémentaire. La végétation de chaque site a été caractérisée sur base de l’abondance de 45 espèces d’arbres ou d’arbustes caractéristiques de la flore chaquéenne. Les propriétés physico-chimiques du sol ont également été mesurées. A fine échelle, l’organisation spatio-temporelle d’un assemblage a été étudié dans une localité de référence.
Résultats: Au total, plus de 50.000 spécimens correspondant à 206 espèces de fourmis ont été collectés avec en moyenne (± SD) 62 ± 10 espèces par localité. Pour un même effort d’échantillonnage, le nombre d’espèces de fourmis récoltées à l’aide des pièges à fosse augmente avec l’aridité et une tendance inverse est observée pour les Winkler. Puisque les Winkler peuvent entraîner une sévère sous-estimation de la diversité des fourmis d’un habitat, seules les données des pièges à fosse sont utilisées pour la suite des analyses. La diversité locale &
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Moreira, Julian. "Évaluer l'apport du binaural dans une application mobile audiovisuelle". Thesis, Paris, CNAM, 2019. http://www.theses.fr/2019CNAM1243/document.
Texto completoIn recent years, smartphone and tablet global performances have been increased significantly (CPU, screen resolution, webcams, etc.). This can be particularly observed with video quality of mobile media services, such as video streaming applications, or interactive applications (e.g., video games). However, these evolutions barely go with the integration of high quality sound restitution systems. Beside these evolutions though, new technologies related to spatialized sound on headphones have been developed, namely the binaural restitution model, using HRTF (Head Related Transfer Functions) filters.In this thesis, we assess the potential contribution of the binaural technology to enhance the quality of experience of an audiovisual mobile application. A part of our work has been dedicated to define what is an “audiovisual mobile application”, what kind of application could be fruitfully experienced with a binaural sound, and among those applications which one could lead to a comparative experiment with and without binaural.In a first place, the coupling of a binaural sound with a mobile-rendered visual tackles a question related to perception: how to spatially arrange a virtual scene whose sound can be spread all around the user, while its visual is limited to a very small space? We propose an experiment in these conditions to study how far a sound and a visual can be moved apart without breaking their perceptual fusion. The results reveal a strong tolerance of subjects to spatial discrepancies between the two modalities. Notably, the absence or presence of individualization for the HRTF filters, and a large separation in elevation between sound and visual don’t seem to affect the perception. Besides, subjects consider the virtual scene as if they were projected inside, at the camera’s position, no matter what distance to the phone they sit. All these results suggest that an association between a binaural sound and a visual on a smartphone could be used by the general public.In the second part, we address the main question of the thesis, i.e., the contribution of binaural, and we conduct an experiment in a realistic context of use. Thirty subjects play an Infinite Runner video game in their daily lives. The game was developed for the occasion in two versions, a monophonic one and a binaural one. The experiment lasts five weeks, at a rate of two sessions per day, which relates to a protocol known as the “Experience Sampling Method”. We collect at each session notes of immersion, memorization and performance, and compare the notes between the monophonic sessions and the binaural ones. Results indicate a significantly better immersion in the binaural sessions. No effect of sound rendering was found for memorization and performance. Beyond the contribution of the binaural, we discuss about the protocol, the validity of the collected data, and oppose theoretical considerations to practical feasibility
Moreira, Julian. "Évaluer l'apport du binaural dans une application mobile audiovisuelle". Electronic Thesis or Diss., Paris, CNAM, 2019. http://www.theses.fr/2019CNAM1243.
Texto completoIn recent years, smartphone and tablet global performances have been increased significantly (CPU, screen resolution, webcams, etc.). This can be particularly observed with video quality of mobile media services, such as video streaming applications, or interactive applications (e.g., video games). However, these evolutions barely go with the integration of high quality sound restitution systems. Beside these evolutions though, new technologies related to spatialized sound on headphones have been developed, namely the binaural restitution model, using HRTF (Head Related Transfer Functions) filters.In this thesis, we assess the potential contribution of the binaural technology to enhance the quality of experience of an audiovisual mobile application. A part of our work has been dedicated to define what is an “audiovisual mobile application”, what kind of application could be fruitfully experienced with a binaural sound, and among those applications which one could lead to a comparative experiment with and without binaural.In a first place, the coupling of a binaural sound with a mobile-rendered visual tackles a question related to perception: how to spatially arrange a virtual scene whose sound can be spread all around the user, while its visual is limited to a very small space? We propose an experiment in these conditions to study how far a sound and a visual can be moved apart without breaking their perceptual fusion. The results reveal a strong tolerance of subjects to spatial discrepancies between the two modalities. Notably, the absence or presence of individualization for the HRTF filters, and a large separation in elevation between sound and visual don’t seem to affect the perception. Besides, subjects consider the virtual scene as if they were projected inside, at the camera’s position, no matter what distance to the phone they sit. All these results suggest that an association between a binaural sound and a visual on a smartphone could be used by the general public.In the second part, we address the main question of the thesis, i.e., the contribution of binaural, and we conduct an experiment in a realistic context of use. Thirty subjects play an Infinite Runner video game in their daily lives. The game was developed for the occasion in two versions, a monophonic one and a binaural one. The experiment lasts five weeks, at a rate of two sessions per day, which relates to a protocol known as the “Experience Sampling Method”. We collect at each session notes of immersion, memorization and performance, and compare the notes between the monophonic sessions and the binaural ones. Results indicate a significantly better immersion in the binaural sessions. No effect of sound rendering was found for memorization and performance. Beyond the contribution of the binaural, we discuss about the protocol, the validity of the collected data, and oppose theoretical considerations to practical feasibility
Libros sobre el tema "Effets d'échantillonnage"
Canada. Division du traitement des déchets., Canada Environnement Canada y A.J. Chandler & Associates., eds. Le Programme d'analyse, d'échantillonnage, d'essais et d'évaluation des déchets (programme WASTE): Effet des caractéristiques du flux de déchets sur l'incinération des déchets solides urbains : devenir et comportement des métaux traces. Ottawa, Ont: Environnement Canada, 1995.
Buscar texto completoInformes sobre el tema "Effets d'échantillonnage"
Faucher, B. F., A. M. LeBlanc, N. Benoît, É. Girard y O. Pedchenko. Physicochemical limnology of lakes in the Rankin Inlet area of Nunavut. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/p4bwndvvbb.
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