Search results for "lithic"
showing 10 items of 392 documents
Ramification of lithic production and the search of small tools in Iberian Peninsula Middle Paleolithic
2015
The notion of recycling and it relationship with ramified productions and small tool production in Late Middle Paleolithic from the Iberian Peninsula are investigated. Results from Amalda, Axlor, Pen~a Miel, and Quebrada show that the production of small tools is one of the principal objectives of lithic provi- sioning in these sites. Whereas in Axlor and Amalda, this is achieved through the ramification of pro- duction, due to the remoteness of flint sources, in Quebrada, where raw material sources are closer, small flakes are obtained at the end of Levallois production. The implications for Neandertal society organi- zation of this small tool production is discussed, and its evolution is …
Enceintes néolithiques de Bourgogne
2002
L'article fait le point sur les enceintes néolithiques identifiées dans les départements bourguignons, principalement Yonne et Côte d'Or. On dénombre ainsi environ 180 sites aménagés défensivement. En plaine, les enceintes privilégient l'installation le long des cours d'eau principaux (Yonne, Armançon, Serein, cours amont de la Saône), à la confluence avec un ru de moindre importance dont le bassin versant s'ouvre sur un "arrière pays" qui offre des opportunités d'échanges. Ainsi s'esquisse un modèle d'occupation du territoire qui débute avec le Cerny et qui évolue jusqu'au Néolithique récent.
Photografted methacrylate-based monolithic columns coated with cellulose tris(3,5-dimethylphenylcarbamate) for chiral separation in CEC
2018
A chiral capillary monolithic column for enantiomer separation in capillary electrochromatography was prepared by coating cellulose tris(3,5-dimethylphenylcarbamate) on porous glycidyl methacrylate-co-ethylene dimethacrylate monolith in capillary format grafted with chains of [2(methacryloyloxy)ethyl] trimethylammonium chloride. The surface modification of the monolith by the photografting of [2(methacryloyloxy)ethyl] trimethylammonium chloride monomer as well as the coating conditions of cellulose tris(3,5-dimethylphenylcarbamate) onto the grafted monolithic scaffold were optimized to obtain a stable and reproducible chiral stationary phase for capillary electrochromatography. The effect o…
Pathologies et traumatismes professionnels au Néolithique ; des mineurs de silex à Chouilly « la Grifaine » (Marne) ?
2021
La fouille réalisée en 2016 par le service archéologique de Reims Métropole sur le site de Chouilly « La Grifaine » a été l’occasion de compléter nos connaissances sur les hypogées de la Marne. L’examen détaillé de l’état sanitaire des sujets issus de l’hypogée F10 a mis en exergue la récurrence de différents traumatismes et de lésions dégénératives qui plaident en faveur d’une activité spécifique qui pourrait être en lien avec l’extraction du silex. Les indices ostéologiques concernent essentiellement les individus inhumés dans les niveaux les plus récents et témoignent, soit d’une modification du recrutement des individus inhumés, soit d’une évolution des activités au cours du temps. The …
Ocular counterrolling. Some practical considerations of a new evaluation method for diagnostic purposes.
1986
Ocular counterrolling (OCR) data taken from the literature (12 publications) were used to test the best fit (least-square fit) of these measurements with respect to three mathematical models: a sine relation between OCR and the lateral tilt stimulus, a complex cosine-square relation, and a logarithmic relation between OCR gain and tilt. The latter proved to be the best fitting function. On the basis of this model, we attempted to define a physiological transfer function between OCR gain and tilt, which could serve as a reference of normal population, assuming healthy subjects for the investigations applied. Comparison of this physiological range with pathological data demonstrated marked di…
European vestibular experiments on the Spacelab-1 mission: 7. Ocular counterrolling measurements pre- and post-flight.
1986
The static ocular counterrolling (OCR) of the four scientific crew members in the first Spacelab mission was measured during baseline-data-collection before and after the flight of SL-1. It was presumed that the modification of otolithic responses during spaceflight will be reflected in specific changes of the OCR-gain on the first days after recovery. The magnitude of OCR was determined analysing colour-transparencies of subjects right eyes that were produced in different positions of lateral body tilt. In general, one subject did not show any changes at all; three subjects exhibited a significant decrease of OCR-gain after exposure to weightlessness, whereby differences could be found bet…
Vestibular compensation of otolith graviceptive dysfunction in stroke patients
2022
BACKGROUND AND PURPOSE A sensitive and frequent clinical sign of a vestibular tone imbalance is the tilt of the perceived subjective visual vertical (SVV). There are no data yet focusing on lesion location at the cortical level as a factor for predicting compensation from the tilt of the SVV. METHODS With modern voxelwise lesion behavior mapping analysis, the present study determines whether lesion location in 23 right-hemispheric cortical stroke patients with an otolith dysfunction could predict the compensation of a vestibular tone imbalance in the chronic stage. RESULTS Our statistical anatomical lesion analysis revealed that lesions of the posterior insular cortex are involved in vestib…
Beyond Hunting Camps: Early Holocene Occupations in High Cantabrian Mountains (Spain)
1998
En la comunicación se presentan los resultados de las excavaciones en el abrigo de La Calvera (Camaleño, Cantabria) incluyendo un conjunto de nuevas dataciones radiocarbónicas y se hace una reflexión sobre la ocupación de las montañas cantábricas al comienzo del Holoceno. In the communication the results of the excavations in La Calvera rock shelter (Camaleño, Cantabria) are presented, including a set of new radiocarbonic dates and a reflection is made on the occupation of the Cantabrian mountains at the beginning of the Holocene.
Performance Enhancement of a Small Animal Positron Emission Tomograph based on Continuous Crystals and Silicon Photomultipliers
2017
La tomografía por emisión de positrones (PET, por sus siglas en inglés) es una técnica de Medicina Nuclear que permite obtener de manera no invasiva imágenes funcionales “in vivo” marcando un compuesto orgánico con un emisor de positrones. Los tomógrafos PET requieren un alta resolución espacial y sensibilidad para estimar con precisión la distribución del radiotrazador en el animal. Frente a los bloques pixelados comúnmente utilizados en PET, los detectores que consisten en la combinación de cristales continuos acoplados a fotodetectores segmentados pueden ofrecer una mayor eficiencia y una alta resolución espacial. Esta última depende de la precisión de los algoritmos de determinación de …