Results 131 to 140 of about 163,369 (269)

Recent progress in studies of the last million years of human physical and behavioural evolution Avancées récentes dans l’étude du dernier million d'années d’évolution physique et éthologique de l'espèce humaine

Journal of the Royal Anthropological Institute, EarlyView.
This article presents a synthesis of recent developments in the study of human evolution over the past five years. It begins with an overview of hominin species nomenclature and diversity, followed by an examination of the proposed population bottleneck ∼900,000 years ago.
James Cole, Eleanor M.L. Scerri, Mateja Hajdinjak, Chris Stringer   +3 more
wiley   +1 more source

Application of Plutonium Isotopes to the Sediment Geochronology of Coarse-Grained Sediments from Englebright Lake, California (USA)

, 2016
The determination of sediment accumulation rates in environments with temporal variations in texture is challenging using traditional radioisotope methods, largely due to low activities associated with coarse sediments.
Beck, Aaron J., Kuehl, S. A., Canuel, E. A., Pondell, C. R.   +3 more
core   +1 more source

The Swanscombe fossil at 90: revisiting its phylogeny, taxonomy, and place in human origins Le fossile de Swanscombe, 90 ans après : retour sur sa place phylogénique, taxonomique et dans les origines de l'humanité

Journal of the Royal Anthropological Institute, EarlyView.
The year 2025 marked the ninetieth since a fossil hominin occipital bone was discovered in Swanscombe, southeast England. In subsequent years, its parietal bones were found, producing what remains the oldest partial cranium from Britain today. In the earliest analyses, it was interpreted as a descendant of the infamous fraudulent fossil Piltdown Man ...
Emma E. Bird, Chris Stringer
wiley   +1 more source

[Determination of cesium in human placenta 3 years after Chernobyl]

, 1990
Three years after the nuclear reactor accident in Chernobyl, 80 human placentae were tested to determine concentrations of cesium 134 and cesium 137 radionuclides.
A. Albiero, F. Perdelli, M. L. Cristina, DIANI, Franco, G. Gallelli   +4 more
core   +1 more source

Alpha decay of neutron-deficient isotopes with 52

, 1981
Using /sup 58/Ni(/sup 58/Ni, xpyn) reactions and on-line mass separation, the alpha -decays of very neutron-deficient isotopes of tellurium, iodine, xenon and cesium were studied.
Kurcewicz, W, Kirchner, R, Tidemand-Petersson, P, Batsch, T, Schardt, D, Klepper, O, Roeckl, E   +6 more
core   +1 more source

Investigating relationships among strontium, barium, and seasonality in wild baboons

Archaeometry, EarlyView.
Abstract Geochemical profiles of Australopithecus africanus and baboon teeth show fluctuating trace elements, possibly reflecting seasonal diets. Here we use laser ablation–inductively coupled plasma–mass spectrometric measurements of calcium‐normalized strontium and barium ratios (Sr/Ca and Ba/Ca) and ion microprobe analyses of oxygen isotopes (δ18O ...
Maya Bharatiya, Christine Austin, Manish Arora, Janaína N. Ávila, Esme K. Beamish, Wendy Dirks, Daniel R. Green, Nicole D. Leonard, W. Scott McGraw, Larissa Swedell, Ian S. Williams, Jian‐xin Zhao, Tanya M. Smith   +12 more
wiley   +1 more source

Mechanisms of lithium and cesium enrichment in the Semi-Dazi geothermal field, Qinghai-Xizang Plateau: insights from H–O–Li–Sr isotopes

Geothermal Energy
Hot springs in the southern Qinghai-Xizang Plateau show anomalous lithium (Li) and cesium (Cs) enrichment, but the mechanisms driving this enrichment remain poorly constrained.
Sheng Pan, Ping Zhao, Hui Guan, Dawa Nan, Zhaoying Yang, Xiaoming Liu, Shaopeng Gao, Yahui Yue   +7 more
doaj   +1 more source

Method Study for Determination of Penetration Time of Resin-fixed Beds Utilized in TRPO Solvent Purification

Yuanzineng kexue jishu
The TRPO process is a treatment methodology for high-level waste liquid that has been independently developed in China. This process uses TRPO as an extractant to remove long-lived isotopes such as transuranic elements and highly toxic isotopes such as ...
MA Yu, XU Cong
doaj   +1 more source

Selection and evaluation of processes for recovery of beneficial isotopes from commerical reactor wastes

, 1977
Conceptual processes were prepared for recovering isotopes from stored high-level liquid wastes to define equipment and facility requirements. Capital costs were estimated for each process.
Partridge, J.A., Koski, O.H., Davis, D.K.   +2 more
core   +1 more source

Glass from Teniky (Madagascar): Geochemical Evidence for Multiple Production Systems and Long‐Distance Exchange in the Mediaeval Indian Ocean

Archaeometry, EarlyView.
ABSTRACT The inland rock‐cut site of Teniky, located in the Isalo massif of southern Madagascar, represents an exceptional archaeological context recently dated to the 11th–12th centuries ad, corresponding to the early phases of settlement on the island.
Jean Rodier, Bernard Gratuze, Vincent Serneels   +2 more
wiley   +1 more source