Results 281 to 290 of about 2,951,677 (344)

Using Cedrus atlantica’s annual rings as a biomonitor in observing the changes of Ni and Co concentrations in the atmosphere

Environmental science and pollution research international, 2021
Ismail Koc
semanticscholar   +1 more source

Proof of concept to characterize historical heavy metal concentrations from annual rings of Corylus colurna: determining the changes of Pb, Cr, and Zn concentrations in atmosphere in 180 years in North Turkey

Air quality, atmosphere and health, 2022
K. Key, Şemsettin Kulaç
semanticscholar   +1 more source

Radiocarbon Measurements and Annual Rings in Cave Formations

Nature, 1960
THE radiocarbon method has been used to test the hypothesis that the prominent rings found in certain calcite deposits of Moaning Cave in California represent annual growth variations. Carbon-14 an alyses were made on two samples taken, from a presumably active section of travertine covering a human femur (Fig. 1). When discovered in 1951, the specimen
WALLACE S. BROECKER, EDWIN A. OLSON, PHIL C. ORR   +2 more
openaire   +1 more source

Stiffening phenomena in annual rings of coniferous wood

Wood Science and Technology, 1984
The structure of coniferous wood is characterized by pronounced differences in density between earlywood and latewood. This could result in disadvantages in wood strength especially against bending. A summary of the observations in this paper leads to the following hypothesis: Coniferous trees meet this danger by forming numerous stiffenings especially
openaire   +1 more source

Annual growth rings in the mangrove Laguncularia racemosa (Combretaceae)

Trees, 2008
Stem discs from trees of known age were used to determine the periodic nature of the growth rings formed in Laguncularia racemosa and to describe the anatomical features of these rings. The growth rings were scarcely distinct on microscopic examination, but they were well distinguishable macroscopically, with alternating light brown and dark brown ...
Gustavo Calderucio Duque Estrada, Cátia Henriques Callado, Mário Luiz Gomes Soares, Cláudio Sérgio Lisi   +3 more
openaire   +1 more source

Growth Rings: Annual Periodicity in Two Gorgonian Corals

Ecology, 1974
Comparison of the number of growth rings present in the skeletons of colonies of two gorgonian corals, Muricea californica and M. fruticosa, with estimates of their age based on observed growth rates indicates that the periodicity of ring formation is annual. Data from two other methods used to determine periodicity support this conclusion. The results
openaire   +1 more source

Annual, semi-annual and solar cycle variations in Sq, and ring current effects

Exploration Geophysics, 1986
The difference of H at two magnetic observatories on the same meridian, but having latitudes equatorwards and polewards of the latitude of the Sq focus, yields a measure of Sq intensity largely free from disturbance. This is because the Sq variations are of opposite sign at the two observatories whereas the disturbance variations, having the same sign ...
openaire   +1 more source

The geomagnetic Svariation—annual, semi-annual and solar cycle variations and ring current effects

Journal of Atmospheric and Terrestrial Physics, 1985
Abstract The difference between H at two magnetic observatories having the same longitude, but latitudes equatorwards and polewards of the latitude of the S q focus, yields a measure of S q intensity largely free from disturbance. Data from all days may be used, which results in improved time resolution of the variations of S q .
openaire   +1 more source

Using Acer platanoides annual rings to monitor the amount of heavy metals accumulated in air

Environmental Monitoring & Assessment, 2018
Aydın Turkyilmaz, H. Sevik, K. Işınkaralar, M. Çetin   +3 more
semanticscholar   +1 more source

Cancer statistics, 2022

Ca-A Cancer Journal for Clinicians, 2022
Rebecca L Siegel, Kimberly D Miller, Ahmedin Jemal Dvm   +2 more
exaly