Results 21 to 30 of about 255,550 (197)

A new type of solar-system material recovered from Ordovician marine limestone

open access: yesNature Communications, 2016
Meteorites falling on Earth today are believed to represent 100–150 parent bodies. Within 470 Myr ago sediments at a limestone quarry in Sweden, Schmitz et al.
B. Schmitz   +5 more
doaj   +1 more source

The oxic degradation of sedimentary organic matter 1400 Ma constrains atmospheric oxygen levels [PDF]

open access: yesBiogeosciences, 2017
We studied sediments from the ca. 1400 million-year-old Xiamaling Formation from the North China block. The upper unit of this formation (unit 1) deposited mostly below storm wave base and contains alternating black and green-gray shales with very ...
S. Zhang   +6 more
doaj   +1 more source

Paternal occupational exposures and infant congenital heart defects in the Japan Environment and Children’s Study

open access: yesEnvironmental Health and Preventive Medicine, 2023
Background: Few prospective studies have investigated the association between paternal occupational exposures and risk of infant congenital heart defects (CHDs).
Mina Hayama-Terada   +6 more
doaj   +1 more source

Chromium Isotopes Detection in their Ores with Minimal Errors

open access: yes, 2018
The industrial production and use of chromium have grown considerably during the past five decades. Abundances of the chromium isotopes in terrestrial samples are identical to 0.01%.
Nuha AlMasri, Loai Aljerf*
core   +1 more source

Measurement of (n,α) cross section for set of structural material isotopes

open access: yesEPJ Web of Conferences, 2017
A novel spectrometer was developed and used to measure the cross section for the (n,α) reaction at IPPE. Direct measurements of the α-particles yield from solid isotopic pure targets of 50, 52 and 53 chromium, 54 and 57 iron, 60 nickel, and 64 zinc were ...
Khryachkov Vitaly   +5 more
doaj   +1 more source

Investigating nuclear deformation and longitudinal form factors in some fp-shell nuclei using the shell model and Hartree - Fock approximation [PDF]

open access: yesЯдерна фізика та енергетика
The current study examined the nuclear deformation of certain Titanium and Chromium isotopes using the shell model and Hartree - Fock approximation within the fp-shell model space.
A. A. Alzubadi, R. T. Mahdi
doaj   +1 more source

High-density element concentrations in fish from subtidal to hadal zones of the Pacific Ocean

open access: yesHeliyon, 2018
Anthropogenic use of high density, toxic elements results in marine pollution which is bio-accumulating throughout marine food webs. While there have been several studies in various locations analyzing such elements in fish, few have investigated ...
Connor J. Welty   +3 more
doaj   +1 more source

Gamma ray heating rates due to chromium isotopes in stellar core during late stages of high mass stars (>10M⊙)

open access: yesEPJ Web of Conferences, 2017
Gamma ray heating rates are thought to play a crucial role during the pre-supernova stage of high mass stars. Gamma ray heating rates, due to β±-decay and electron (positron) capture on chromium isotopes, are calculated using proton-neutron quasiparticle
Nabi Jameel-Un, Fayaz Muhammad
doaj   +1 more source

Spin-isospin transitions in chromium isotopes within the quasiparticle random phase approximation

open access: yes, 2015
Beta decay and electron capture on isotopes of chromium are advocated to play a key role in the stellar evolution process. In this paper we endeavor to study charge-changing transitions for 24 isotopes of chromium ( 42-65
Babacan T.   +3 more
core   +1 more source

Concentrator cell methodology in the regeneration and recycle of chromium etching solutions using membrane technology [PDF]

open access: yes, 2006
The regeneration of chromium (VI) and the recovery of etched copper from chromium etching solutions by electrodialysis is improved by the addition of a concentrator cell, using ion exchange resins or activated carbon cloth as concentrator media, in the ...
Ganguli, B, Grimes, SM, Chaudhary, AJ
core   +1 more source

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