Auswahl der wissenschaftlichen Literatur zum Thema „Essences secondaires“
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Zeitschriftenartikel zum Thema "Essences secondaires"
Queloz, Valentin, Hervé Jactel, Benoit Marçais, Eckehard G. Brockerhoff und Marco Pautasso. „Rôle des agents biotiques dans les crises sanitaires forestières“. Revue forestière française 74, Nr. 2 (23.06.2023): 133–43. http://dx.doi.org/10.20870/revforfr.2023.7587.
Der volle Inhalt der QuelleAmbombo Onguene, E. M., J. B. Ngodo Melingui, A. C. Pial, A. Mbarga Bindzi und D. C. Mossebo. „Dynamique de la régénération naturelle des essences commerciales sur les routes secondaires de différents âges de l’UFA 09-003 (Djoum, Cameroun)“. International Journal of Biological and Chemical Sciences 12, Nr. 1 (01.06.2018): 341. http://dx.doi.org/10.4314/ijbcs.v12i1.27.
Der volle Inhalt der QuelleWeaver, Peter L. „Changements à long terme de structure et de composition d'une forêt primaire humide de basse montagne suite au passage d'ouragans a Puerto Rico“. BOIS & FORETS DES TROPIQUES 317, Nr. 317 (01.09.2013): 7. http://dx.doi.org/10.19182/bft2013.317.a20525.
Der volle Inhalt der QuelleAubréville, André, und Ilona Bossanyi. „Secondary Forests in Equatorial Africa Côte d’Ivoire - Cameroon - F. E. A.“ BOIS & FORETS DES TROPIQUES 323, Nr. 323 (07.01.2015): 19. http://dx.doi.org/10.19182/bft2015.323.a31241.
Der volle Inhalt der QuelleKoubouana, Félix, Irène Marie Cécile Mboukou Kimbatsa Née Goma, Leckoundzou Ayessa, Saint Fédriche Ndzai, Benicia Marietta Bissanga und Donatien Nzala. „Richesse De La Flore Ligneuse Exploitable Et Planification Des Émissions Du CO2 Dans Une Forêt De Production Du Mayombe Congolais“. European Scientific Journal, ESJ 18, Nr. 14 (30.04.2022): 75. http://dx.doi.org/10.19044/esj.2022.v18n14p75.
Der volle Inhalt der QuelleGérardin, Pauline, Clément Fritsch, Sylvain Cosgun, Maree Brennan, Stéphane Dumarçay, Francis Colin und Philippe Gérardin. „Effet de la hauteur de prélèvement sur la composition quantitative et qualitative des polyphénols de l’écorce d’Abies alba Mill.“ Revue forestière française 72, Nr. 5 (31.10.2020): 411–23. http://dx.doi.org/10.20870/revforfr.2020.5338.
Der volle Inhalt der QuelleJehel, L., M. Evans, J. L. Sigward und C. Debien. „Faire face au traumatisme du patient, quel impact pour les médecins ?“ European Psychiatry 28, S2 (November 2013): 76. http://dx.doi.org/10.1016/j.eurpsy.2013.09.202.
Der volle Inhalt der QuelleBECQUEY, Jacques. „Pour alléger le suivi des plantations : le mélange avec des essences secondaires“. Revue Forestière Française, Nr. 2 (2008). http://dx.doi.org/10.4267/2042/18153.
Der volle Inhalt der QuelleDOUH, Chauvelin. „Rôle de la banque de graines du sol dans la régénération des forêts denses humides d’Afrique centrale“. BOIS & FORETS DES TROPIQUES 342 (25.11.2019). http://dx.doi.org/10.19182/bft2019.342.a31816.
Der volle Inhalt der QuelleDissertationen zum Thema "Essences secondaires"
Ella, Nkogo Ley-Fleury. „Caractérisation des extractibles des bois de Petersianthus macrocarpus et Letestua durissima : une approche multicritère pour comprendre leur durabilité naturelle et explorer de nouvelles opportunités de valorisation“. Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0087.
Der volle Inhalt der QuelleThis study focused on two main axes : the characterization and study of the properties of extractable substances from two secondary species of the Gabonese forest with a view to possible valorization, Letestua durissima and Petersianthus macrocarpus, as well as the analysis of the factors influencing the natural durability of wood. The research began with successive extractions by maceration and Soxhlet (using cyclohexane, dichloromethane, acetone, toluene/ethanol mixture and water) of the bark, sapwood and heartwood. The results revealed high concentrations of extractables, particularly in the barks of both species, with phytochemical analysis highlighting the presence of various chemical families such as phenolic compounds, fatty acids, terpenes and terpenoids. Infrared analyzes confirmed the presence of these compounds. Additionally, the use of GC-MS and LC-MS allowed us to identify compounds such as catechin, gallocatechin, gallic acid, vanillin, etc. promising against brown and white rot fungi, as well as antibacterial activity, particularly against Escherichia coli, with Letestua durissima extracts particularly standing out. The extracts also showed anti-termite properties. Finally, a broader study concerning the study of different factors influencing the natural durability of wood highlighted a strong correlation between parameters such as density, humidity rate, wettability, extract rate and sugar/lignin ratio and sustainability
Martinez, Alvaro. „Contribution des composés organiques volatils (COVs) provenant des émissions des véhicules aux aérosols organiques secondaires (AOS) et à la pollution urbaine“. Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1041.
Der volle Inhalt der QuelleThe transport sector is fundamental to the economic development of a country and to ensure communication and a good quality of life. However, road transport contributes significantly to global warming and leads to serious degradation of the air quality. Among all pollutants, fine and ultrafine particles, emitted by vehicles but also formed in the atmosphere are considered as potentially toxic. Many studies show that chronic exposure to fine particles promotes the development of respiratory and cardiovascular diseases. The main gaseous precursors, the atmospheric chemical pathways as well as the chemical composition and the physical transformations that secondary organic aerosol (SOA) undergo in the atmosphere, remain poorly understood. The main aim of this work was on one side to improve the knowledge about primary pollutants emitted from Euro 5 and Euro 6 diesel and gasoline passenger cars and on the other side to investigate the photochemical transformations of the VOCs/IVOCs emitted from these cars. Passenger car emissions have been evaluated on a chassis dynamometer test bench at the IFSTTAR laboratory. Particle number measurements were carried out directly at the tailpipe. For GDI vehicles PN0.23 (< 23 nm) represented on average 20 -30 % of total particle number emitted, while for diesel cars, this fraction was considerably lower (≈10-15%). During high speed regimes (Artemis motorway) of diesel passenger cars Diesel Particulate Filter (DPF) passive regeneration was observed. These periods were characterized by a high particle number concentration; their composition was mainly soot, bisulfate and some organic material. PM emitted from gasoline DI passenger cars was mainly composed by BC and some organic droplets containing traces of other elements. During cold start GDI cars do emit important concentrations of BC and organic material. Emission of hydrocarbons has also been investigated. Gasoline DI emitted important concentration of THCs during cold start. Among the aliphatic compounds, families until C15 have been identified, confirming emission of heavier HCs from diesel cars. The second aim of this work was the study of atmospheric degradation of selected VOCs (toluene, naphthalene, cyclohexane, nonane) emitted from Euro 5 and Euro 6 vehicles and to determine the SOA formation potential of these compounds under different environmental conditions. The chosen compounds have been photoxidized (alone and in mixture) in an Aerosol Flow Tube (AFT) reactor in order to simulate VOCs atmospheric aging. The results suggest: (1) aromatic and PAHs compounds, own highest potential to form SOA; (2) the temperature has an important impact on SOA formation and yield; (3) the presence of pre-existing seed particles has, in general, a positive effect on SOA formation and (4) NOx has been found to negatively affect SOA formation; (5) SOA potential formation of VOC mixtures is highly influenced by the fraction of aromatics. Some of the products identified in the particle phase have never been previously reported. Degradation of aromatic compounds under medium NOx regime produced nitro-aromatic compounds identified both in the gas and particle phase. This PhD contributes to enrich vehicle emissions database, still limited for Euro 5 and Euro 6 cars. Speciation of non-regulated compound will help to better understand atmospheric SOA budget and car emissions air quality impacts. By last, the photoxidation study of primary VOCs (alone, mixture and full emissions) will lead to a better comprehension of SOA formation from vehicles