The accelerator mass spectrometry (AMS) center at Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest, is based on the latest-generation 1 MV Tandetron® accelerator, produced by High Voltage Engineering Europa (HVEE), The Netherlands. The AMS center became fully functional at the start of 2013, and at the end of 2015 the laboratory established the RoAMS international code and it was added to the list of AMS laboratories maintained by Radiocarbon journal. An important aspect in the establishment of a new AMS laboratory is the declaration and documentation of the adopted protocols and to demonstrate the reliability and reproducibility of the measurements in comparison to internationally recognized reference materials. In this paper, we present the dating results on the Sixth International Radiocarbon Intercomparison (SIRI) samples that were pretreated, graphitized, and measured in our laboratory. The newly developed sample preparation laboratory can handle sample materials as (1) organic materials, (2) wood, (3) bones, and (4) carbonates. The results of our measurements are in very good agreement with the SIRI consensus values and confirm the reliability of our sample preparation laboratory and also the good performance of the HVEE AMS system. The blank levels for the SIRI materials are 0.277±0.045/0.333±0.046 percent modern carbon (pMC) for wood samples, 0.441±0.038 pMC for bone collagen, and 0.239±0.030 pMC for carbonate materials, considering an average mass of 1 mg sample graphite.
nombreuses recherches de terrain dans la zone littorale du lac Golovița, sur la zone des communes actuelles de Baia et de Ceamurlia de Jos (département de Tulcea). Il publiera en 1966 une partie des fouilles conduites sur les habitats de Baia-Golovița et Ceamurlia de Jos. Dans le même intervalle de temps, Dumitru Berciu va réaliser des fouilles dans le village même de Baia, sur le tell de "Boruz". En 2019, dans le cadre d'un projet de l'Académie Roumaine, un collectif Franco-Roumain a engagé la revisite des collections et des archives conservées à l'Institut d'archéologie "Vasile Pârvan". Ce travail, encore en cours, permet de jeter un exposant nouveau regard sur le peuplement de la zone littorale de l'actuel lac Golovița entre le 6 e millénaire et le 5 e millénaires avant notre ère. L'analyse des archives et des prospections de terrain nous ont permis de localiser avec précisions les trois sites, et notamment le tell de "Boruz", pour lequel nous ne disposons d'aucune archive écrite, mais seulement des ensembles mobiliers conservés à Bucarest. L'objet de cet article est de présenter un bilan d'étape, et, au vu des premières datations radiocarbone obtenues, d'évaluer les hypothèses émises par Dumitru Berciu quant à l'antériorité de l'établissement de Baia-Golovița sur celui de Ceamurlia de Jos. Un autre enjeu est de proposer une relecture, malgré l'absence d'archives, de la stratigraphie du tell Chalcolithique Gumelnița de "Boruz". Rezumat: Reanalizarea colecȚiilor arheologice neolitice și calcolitice din zona Hamangia-Baia: noi date cronologice referitoare la cercetările realizate de Dumitru Berciu Între 1952 și 1961, Dumitru Berciu a realizat numeroase cercetări arheologice în zona lacului Golovița, pe teritoriul actual al comunelor Baia și Ceamurlia de Jos (jud. Tulcea). După finalizarea acestora, în anul 1966 a fost publicată o parte a săpăturilor din așezările atribuite culturii Hamangia de la Baia-Golovița și Ceamurlia de Jos. În același interval de timp, Dumitru Berciu a condus săpăturile de pe tell-ul localizat în marginea de vest a satului Baia (tell-ul "Boruz"). În anul 2019, ca parte a unui proiect al Academiei Române, un colectiv franco-român a propus o reanalizare a colecțiilor și arhivelor păstrate la Institutul de Arheologie "Vasile Pârvan" din București. Această activitate, încă în desfășurare, ne va permite în primul rând să aruncăm o nouă privire asupra așezărilor din zona lacului Golovița din perioada mileniilor VI și V î.e.n. Analiza arhivelor și cercetărilor de teren ne-a permis să localizăm cu precizie cele trei așezări mai sus menționate, în special tell-ul de la Baia, pentru care nu exista o documentație scrisă, ci doar o parte din materialele păstrate la București. Scopul acestui articol este să prezinte un raport de etapă și, având în vedere primele datări radiocarbon obținute, să evalueze ipotezele înaintate de Dumitru Berciu cu privire la anterioritatea sitului de la Baia-Golovița față de cel de la Ceamurlia de Jos. O altă provocare este aceea de a propune o relectură a stratigrafiei aș...
Southeast Europe has played an important role in shaping the genetic diversity of sheep due to its proximity to the Danubian route of transport from the Near East into Europe, as well as its possible role as a post-domestication migration network and long tradition of sheep breeding. The history of Romania and, in particular, the historical province of Dobruja, located on the shore of the Black Sea, has been influenced by its geographical position at the intersection between the great powers of the Near East and mainland Europe, with the Middle Ages being an especially animated time in terms of trade, migration, and conflict. In this study, we analyzed the mitochondrial control region of five sheep originating from the Capidava archaeological site (Dobruja, Southeast Romania), radiocarbon dated to the Early Middle Ages (5th–10th century AD), in order to better understand the genetic diversity of local sheep populations and human practices in relation to this particular livestock species. The analyses illustrate high haplotype diversity in local medieval sheep, as well as possible genetic continuity in the region. A higher tendency for North to South interaction, rather than East to West, is apparent, together with a lack of interaction along the Asian route. Continuous interaction between the First Bulgarian Empire, which occupied Dobruja starting with the 7th century AD, and the Byzantine Empire is indicated. These results might suggest expanding trade in Southeast Romania in the Early Middle Ages.
Physical origin of the transition from symmetric to asymmetric fission fragment charge distribution
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.