Aménagements des parcours de poulets Label Rouge et Biologiques

La présence d'un parcours est un élément majeur caractérisant les productions de volailles sous signes de qualité Label Rouge et Biologique. Pour permettre la durabilité de ces modes de production, il est nécessaire d'optimiser la gestion des parcours, afin de concilier au mieux les besoins des volailles, la production d'un revenu supplémentaire pour l'éleveur et une gestion environnementale pertinente. Pour cela, il était avant tout nécessaire de connaître la diversité des caractéristiques des parcours existants. Une enquête a été réalisée auprès des éleveurs de différents bassins de production français, et a permis de décrire les aménagements arborés des parcours, et les pratiques de gestion. Sept types d'aménagements des parcours ont été mis en évidence selon la présence ou non de haies périphériques, d'arbustes à proximité des trappes des bâtiments à vocation d'aménagements zootechniques, d'arbres à distance plus ou moins éloignée du bâtiment, de plantations arborées entre ces deux zones de parcours. Cette typologie permet d'apporter des préconisations d'amélioration adaptées à chaque situation

Texas Transportation Researcher

Quarterly magazine of the Texas Transportation Institute discussing the research, professional, and service activities of the organization as well as general research and innovations related to transportation in Texas

Texas Transportation Researcher

Quarterly magazine of the Texas Transportation Institute discussing the research, professional, and service activities of the organization as well as general research and innovations related to transportation in Texas

Texas Transportation Researcher

Quarterly magazine of the Texas Transportation Institute discussing the research, professional, and service activities of the organization as well as general research and innovations related to transportation in Texas

Thermal evolution of an ancient subduction interface revealed by Lu–Hf garnet geochronology, Halilbagi Complex (Anatolia)

The thermal structure of subduction zones exerts a major influence on deep-seated mechanical and chemical processes controlling arc magmatism, seismicity, and global element cycles. Accretionary complexes exposed inland may comprise tectonic blocks with contrasting pressure–temperature (P–T) histories, making it possible to investigate the dynamics and thermal evolution of former subduction interfaces. With this aim, we present new Lu–Hf geochronological results for mafic rocks of the Halilbagi Complex (Anatolia) that evolved along different thermal gradients. Samples include a lawsonite–epidote blueschist, a lawsonite–epidote eclogite, and an epidote eclogite (all with counter-clockwise P–T paths), a prograde lawsonite blueschist with a “hairpin”-type P–T path, and a garnet amphibolite from the overlying sub-ophiolitic metamorphic sole. Equilibrium phase diagrams suggest that the garnet amphibolite formed at ~0.6–0.7 GPa and 800–850 °C, whereas the prograde lawsonite blueschist records burial from 2.1 GPa and 420 °C to 2.6 GPa and 520 °C. Well-defined Lu–Hf isochrons were obtained for the epidote eclogite (92.38 ± 0.22 Ma) and the lawsonite–epidote blueschist (90.19 ± 0.54 Ma), suggesting rapid garnet growth. The lawsonite–epidote eclogite (87.30 ± 0.39 Ma) and the prograde lawsonite blueschist (ca. 86 Ma) are younger, whereas the garnet amphibolite (104.5 ± 3.5 Ma) is older. Our data reveal a consistent trend of progressively decreasing geothermal gradient from granulite-facies conditions at ~104 Ma to the epidote-eclogite facies around 92 Ma, and the lawsonite blueschist–facies between 90 and 86 Ma. Three Lu–Hf garnet dates (between 92 and 87 Ma) weighted toward the growth of post-peak rims (as indicated by Lu distribution in garnet) suggest that the HP/LT rocks were exhumed continuously and not episodically. We infer that HP/LT metamorphic rocks within the Halilbagi Complex were subjected to continuous return flow, with “warm” rocks being exhumed during the tectonic burial of “cold” ones. Our results, combined with regional geological constraints, allow us to speculate that subduction started at a transform fault near a mid-oceanic spreading centre. Following its formation, this ancient subduction interface evolved thermally over more than 15 Myr, most likely as a result of heat dissipation rather than crustal underplating

Quaternary uplift rates of the Central Anatolian Plateau, Turkey: insights from cosmogenic isochron-burial nuclide dating of the Kızılırmak River terraces

The Central Anatolian Plateau (CAP) in Turkey is a relatively small plateau (300 × 400 km) with moderate average elevations of ∼1 km situated between the Pontide and Tauride orogenic mountain belts. Kızılırmak, which is the longest river (1355 km) within the borders of Turkey, flows within the CAP and slowly incises into lacustrine and volcaniclastic units before finally reaching the Black Sea. We dated the Cappadocia section of the Kızılırmak terraces in the CAP by using cosmogenic burial and isochron-burial dating methods with 10Be and 26Al as their absolute dating can provide insight into long-term incision rates, uplift and climatic changes. Terraces at 13, 20, 75 and 100 m above the current river indicate an average incision rate of 0.051 ± 0.01 mm/yr (51 ± 1 m/Ma) since ∼1.9 Ma. Using the base of a basalt fill above the modern course of the Kızılırmak, we also calculated 0.05–0.06 mm/yr mean incision and hence rock uplift rate for the last 2 Ma. Although this rate might be underestimated due to normal faulting along the valley sides, it perfectly matches our results obtained from the Kızılırmak terraces. Although up to 5–10 times slower, the Quaternary uplift of the CAP is closely related to the uplift of the northern and southern plateau margins respectively

Éphéméride de la planète (259) Aletheia, calculée pour minuit moyen de paris,

Pourteau Abel. Éphéméride de la planète (259) Aletheia, calculée pour minuit moyen de paris. In: Bulletin astronomique, tome 14, 1897. pp. 98-99

Éphéméride de la planète (116) Sirona, calculée pour minuit moyen de Paris

Pourteau Abel. Éphéméride de la planète (116) Sirona, calculée pour minuit moyen de Paris. In: Bulletin astronomique, tome 14, 1897. pp. 67-68

"Schooled in adversity": Republican ideals and social conscience in The Sketch Book

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