94 research outputs found
A study of backward going and in interactions with the NOMAD detector
Backward proton and production has been studied in
interactions with carbon nuclei. Detailed analyses of the momentum
distributions, of the production rates, and of the general features of events
with a backward going particle, have been carried out in order to understand
the mechanism producing these particles. The backward proton data have been
compared with the predictions of the reinteraction and the short range
correlation models.Comment: 29 pages, 14 figures, submitted to Nucl. Phys.
Ion reduction in iron oxide and oxyhydroxide nanoparticles during5ultrasonic treatment
The effect of ultrasonic treatment of iron oxide and iron oxyhydroxide nanoparticles (ferrihydrite
nanoparticles synthesized by Klebsiella oxytoca microorganisms, ferrihydrite nanoparticles synthesized
by a chemical method and hematite nanoparticles) is studied. Samples of nanoparticles were investigated
using transmission electron microscopy, Mössbauer spectroscopy and X-ray diffraction methods. The for-
mation of the a-Fe metal phase from nanoparticles of iron oxides and iron oxyhydroxides was detected.
The metal phase is formed as a result of the reduction of iron ions during cavitation treatment. According
to the experimental results, the presence of a protein or a polysaccharide component is necessary for the
course of this reactio
Magnetic properties of bottom sediments of Lake Shira (Siberia, Russia)
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.Magnetic properties were studied in bottom sediments of saline meromictic Shira Lake by the
methods of static magnetometry and resonance Mössbauer spectroscopy for the first time. All layers of bottom
sediments contain nanosized single-domain magnetite particles produced by magnetotactic bacteria.
The concentration of magnetite in bottom sediments decreased with depth, reaching a local minimum in the
layer corresponding to the minimal level of the lake observed in 1910–1930. It is demonstrated that biogenic
magnetite may indicate climate-related changes in the level of Shira Lake, in addition to the other biological
and geochemical characteristics
Magnetic properties of bottom sediments of Lake Shira (Siberia, Russia)
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.Magnetic properties were studied in bottom sediments of saline meromictic Shira Lake by the
methods of static magnetometry and resonance Mössbauer spectroscopy for the first time. All layers of bottom
sediments contain nanosized single-domain magnetite particles produced by magnetotactic bacteria.
The concentration of magnetite in bottom sediments decreased with depth, reaching a local minimum in the
layer corresponding to the minimal level of the lake observed in 1910–1930. It is demonstrated that biogenic
magnetite may indicate climate-related changes in the level of Shira Lake, in addition to the other biological
and geochemical characteristics
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