Results 61 to 70 of about 110,749 (288)
Tallinn Radiocarbon Dates I [PDF]
Radiocarbon, 1973 Preparations for determining absolute age by the radiocarbon method were started at the Institute of Geology, Academy of Sciences of the Estonian SSR in 1971. Dating of samples has been carried out since 1972.
J M Punning, T Kakum, R Rajamäe
openaire +3 more sources
Assessing fossil fuel CO2 emissions in California using atmospheric observations and models
Environmental Research Letters, 2018 Analysis systems incorporating atmospheric observations could provide a powerful tool for validating fossil fuel CO _2 (ffCO _2 ) emissions reported for individual regions, provided that fossil fuel sources can be separated from other CO _2 sources or ...
H Graven +20 more
doaj +1 more source
Riken Natural Radiocarbon Measurements VII [PDF]
Radiocarbon, 1964 The C14 dates given below are continued from our previous list (R., 1970, v. 12, p. 559–576), and results obtained mainly during 1970 are described. A 2.7 L stainless steel counter and a 3.3 L copper counter are used, yielding background counting rates of 5.5 and 8.5 cpm, respectively, when filled with dead CO2 at ca. 1.8 atm.
Fumio Yamasaki +2 more
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The Anatomical Record, EarlyView.Abstract The Pleistocene is a key period for understanding the evolutionary history and palaeobiogeography of the European rabbit (Oryctolagus cuniculus). The species was first documented in southeastern Iberia at the beginning of the Middle Pleistocene and appears to have rapidly spread throughout Southwestern Europe, where it was found in numerous ...
Maxime Pelletier
wiley +1 more source
Spring buds of European woody plants have old 14C age
HeliyonTrees and shrubs maintain carbon reserves to support their functions during periods when metabolic demand exceeds carbon supply, such as during the dormant season.
Tamás Varga +5 more
doaj +1 more source
The Anatomical Record, EarlyView.Abstract The human mandibular symphysis concentrates multiaxial loads during function and remodels throughout growth, but the precise mechanisms underlying cortical bone shape during growth remain relatively unexplored. Approaches based solely on thickness or external cortical contours provide only partial insights and do not capture the functional ...
Ana Ribeiro +3 more
wiley +1 more source
Is the Sun a Long Period Variable [PDF]
, 1990 The inventory of atmospheric radiocarbon exhibits quasi-periodic variations of mean period of bar-lambda=269 years over the entire 9000 year record. But the period is inconstant and subject to random variability (sigma m exp. 1/2 = 119 years).
Sonett, Charles P.
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Lyon Natural Radiocarbon Measurements IX [PDF]
Radiocarbon, 1969 This list includes most of the measurements made in 1979 through 1981 and some values obtained during preceding years. The reporting of results, their calculation (half-life: 5570 ± 0, standard 13C correction only for bones), and the dilution ratios are as previously described in Lyon VIII (R, 1979, v 21, p 402–452).
J. Evin, G. Marien, Ch. Pachiaudi
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Archaeology in Oceania, EarlyView.ABSTRACT This paper reports on the excavation of a cache of stone artefacts, buried on the bank of a waterhole or ‘billabong’ in central western Queensland. This is an extremely rare find, and yet it is the second such site to be reported within less than a 10 km radius.
Yinika L. Perston +5 more
wiley +1 more source
Radiocarbon Dates from the Pine Snake Site (41CE467), Cherokee County, Texas [PDF]
, 2016 The Pine Snake site is a late 17th to early 18th century Caddo Indian archaeological site located on private land in the northwestern part of Cherokee County, Texas, in the valley of the westward-flowing Flat Creek, a tributary to the Neches River.
Perttula, Timothy K.
core +1 more source