Search results for "PG"
showing 10 items of 1521 documents
A methodological approach in the evaluation of the efficacy of treatments for the dimensional stabilisation of waterlogged archaeological wood
2010
Abstract The aim of the work is to set up a methodological approach to verify the effectiveness of the treatments of decayed waterlogged archaeological wood and to point out the proper thermo-hygrometric conditions for its preservation after treatment. The treatments were performed on wood samples of maritime pine (Pinus pinaster Aiton), oak (Quercus sp. caducifolia), elm (Ulmus cf. minor) and strawberry tree (Arbutus unedo L.), obtained from stems pertaining to the original vegetation found in the excavation site of the Ancient Ships in Pisa (Italy), and dated from seventh century BC to second century AD The utilised products were: Polyethylene Glycols (PEG) of various molecular weights, a…
Variabilité architecturale du test chez le genre Collyrites (Echinoidea, Disasteroidea) au Jurassique moyen.
2007
Resume L’evolution de l’architecture du test et en particulier celle du « complexe systeme apical–periprocte » chez le genre Collyrites (Echinoidea, Disasteroidea) est analysee pour les especes des etages Bathonien et Callovien (Jurassique moyen) provenant de plusieurs localites du bassin de Paris. Le systeme apical du genre Collyrites est subdivise en deux parties : (i) une partie anterieure, denommee trivium, composee de quatre plaques genitales (1, 2, 3, 4) et de trois plaques ocellaires (II ; III ; IV) ; (ii) une partie posterieure, denommee bivium, composee de deux plaques ocellaires (I, V) et d’une plaque genitale (5), sans gonopore et non fonctionnelle, entourant le periprocte. Le pa…
Efficient MLP Digital Implementation on FPGA
2005
The efficiency and the accuracy of a digital feed-forward neural networks must be optimized to obtain both high classification rate and minimum area on chip. In this paper an efficient MLP digital implementation. The key features of the hardware implementation are the virtual neuron based architecture and the use of the sinusoidal activation function for the hidden layer. The effectiveness of the proposed solutions has been evaluated developing different FPGA based neural prototypes for the High Energy Physics domain and the automatic Road Sign Recognition domain. The use of the sinusoidal activation function decreases hardware resource employment of about 32% when compared with the standar…
Redécouverte d'une faune pléistocène dans les remplissages karstiques de Tam Hang au Laos : premiers résultats.
2008
12 pages; The discovery of a Pleistocene fauna in karstic fills at TamHang in Laos: preliminary results. TamHang, located in northeastern Laos, in the Hua Pan province, is a reference site not only for its numerous archaeological and human remains, but also for its two faunal assemblages, whose composition suggests different dating in the Pleistocene. Discovered in 1934 by Jacques Fromaget, a new excavation of the site has been undertaken in 2003. During this campaign, at Tam Hang south, 575 isolated teeth of mammals were extracted from a deep layer of calcareous breccia. This assemblage corresponds to that one described by Arambourg and Fromaget [C. Arambourg, J. Fromaget, Le gisement quat…
Investigating the influence of climate changes on rodent communities at a regional-scale (MIS 1-3, southwestern France).
2016
25 pages; International audience; Terrestrial ecosystems have continuously evolved throughout the Late Pleistocene and theHolocene, deeply affected by both progressive environmental and climatic modifications, aswell as by abrupt and large climatic changes such as the Heinrich or Dansgaard-Oeschgerevents. Yet, the impacts of these different events on terrestrial mammalian communities arepoorly known, as is the role played by potential refugia on geographical species distributions.This study examines community changes in rodents of southwestern France between50 and 10 ky BP by integrating 94 dated faunal assemblages coming from 37 archaeologicalsites. This work reveals that faunal distributi…
A new hybrid procedure for the definition of seismic vulnerability in Mediterranean cross-border urban areas
2016
Assessment of seismic vulnerability of urban areas provides fundamental information for activities of planning and management of emergencies. The main difficulty encountered when extending vulnerability evaluations to urban contexts is the definition of a framework of assessment appropriate for the specific characteristics of the site and providing reliable results with a reasonable duration of surveys and post-processing of data. The paper proposes a new procedure merging different typologies of information recognized on the territories investigated and for this reason called “hybrid.” Knowledge of historical events influencing urban evolution and analysis of recurrent building technologie…
Ģeogrāfiskās telpas sociālā konstruēšana: Austrumeiropas (vai Orienta) konceptualizācijas piemērs
2017
Mentālās kartes ir neatdalamā daļa no mūsu domāšanas. Mentālās kartes ietekmē cilvēku subjektīvās vēsturiskās, ģeogrāfiskās un politiskās telpas veidošanu. Šajā darbā es aprakstīšu, kā ar mentālo karšu palīdzību laikmetā no 18.gs. Rietumeiropā aizsākās Austrumeiropas priekšstata veidošanas vēsture, kura attīstība tiks izskatīta līdz mūsdienām. Šī jautājuma noskaidrošanai, par pamatu pielietoju L. Vulfa grāmatu “Izgudrojot Austrumeiropu”, A. Apelbauma “Dzelzs priekškars”, H. Lefevra “Telpas konstruēšana”.
New physics in $B$ meson mixing: future sensitivity and limitations
2020
The mixing of neutral mesons is sensitive to some of the highest scales probed in laboratory experiments. In light of the planned LHCb Upgrade II, a possible upgrade of Belle II, and the broad interest in flavor physics in the tera-Z phase of the proposed FCC-ee program, we study constraints on new physics contributions to Bd and Bs mixings which can be obtained in these benchmark scenarios. We explore the limitations of this program, and identify the measurement of |Vcb| as one of the key ingredients in which progress beyond current expectations is necessary to maximize future sensitivity. We speculate on possible solutions to this bottleneck. Given the current tension with the standard mo…
Benzpinakola un tā piemaisījumu atdalīšana ar AF-AEŠH
2015
Benzpinakona un tā piemaisījumu sadalīšana ar apgrieztās fāzes augsti efektīvo šķidrumu hromatogrāfiju. Ernstsons A., darba zinātniskā vadītāja doktorante Mg. chem. Rotkāja.O. bakalaura darbs, 35 lappuses, 21 attēls, 4 tabulas, 27 atsauces, 2 pielikumi. Latviešu valodā. Lai izstrādātu metodi benzpinakona un tā piemaisījumu sadalīšanai ar apgrieztās fāzes augsti efektīvo šķidrumu hromatogrāfiju eksperimentālajā daļā tika izmantotas divas kolonnas YMC Pack C8 un Cosmosil C18-MSII un divas kustīgās fāzes acetonitrils/ūdens, metanols/ūdens. Eksperimentu rezultātā tika noskaidrots, ka benzpinakona un tā piemaisījumu sadalīšanai piemērotāka ir Cosmosil C18-MSII kolonna un kustīgā fāze metanols/ūd…
Récit d’un « tremplin ». Des bacheliers professionnels en classe préparatoire
2021
International audience; Rares sont les bacheliers professionnels à déjouer les statistiques en s’orientant vers une classe préparatoire aux grandes écoles. L’audace des bacheliers professionnels, peu préparés aux exigences académiques des cursus longs et engagés dans une voie où ils sont traditionnellement moins attendus, interpelle. Comment ces jeunes justifient-ils ce parcours improbable ? Les propos des bacheliers professionnels rencontrés sont révélateurs à la fois de la représentation qu’ils se font de leur orientation, de la place qu’ils « rêvent » dans la société à venir et aussi du niveau de confiance dans leurs « capacités » à y parvenir. Dans un cadre stimulant, l'horizon des écol…