Investigation of fusion dynamics for reactions induced by Si-isotopes at similar Ec.m.

2020 ◽  
Author(s):  
Rupinder Kaur ◽  
Maninder Kaur ◽  
Varinderjit Singh ◽  
Bir Bikram Singh ◽  
B. S. Sandhu
Keyword(s):  
Si Isotopes

scholarly journals Silicon isotopes in Antarctic sponges: an interlaboratory comparison

2010 ◽  
Vol 23 (1) ◽  
pp. 34-42 ◽  
Author(s):  
Katharine R. Hendry ◽  
Melanie J. Leng ◽  
Laura F. Robinson ◽  
Hilary J. Sloane ◽  
Jerzy Blusztjan ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Matrix Effects ◽  
Global Climate ◽  
Intermediate Water ◽  
Silicon Isotopes ◽  
Important Player ◽  
Si Isotopes ◽  
Si Isotope ◽  
Additional Reference ◽  
Antarctic Sponges

AbstractCycling of deepwater silicon (Si) within the Southern Ocean, and its transport into other ocean basins, may be an important player in the uptake of atmospheric carbon, and global climate. Recent work has shown that the Si isotope (denoted by δ29Si or δ30Si) composition of deep sea sponges reflects the availability of dissolved Si during growth, and is a potential proxy for past deep and intermediate water silicic acid concentrations. As with any geochemical tool, it is essential to ensure analytical precision and accuracy, and consistency between methodologies and laboratories. Analytical bias may exist between laboratories, and sponge material may have matrix effects leading to offsets between samples and standards. Here, we report an interlaboratory evaluation of Si isotopes in Antarctic and sub-Antarctic sponges. We review independent methods for measuring Si isotopes in sponge spicules. Our results show that separate subsamples of non-homogenized sponges measured by three methods yield isotopic values within analytical error for over 80% of specimens. The relationship between δ29Si and δ30Si in sponges is consistent with kinetic fractionation during biomineralization. Sponge Si isotope analyses show potential as palaeoceaongraphic archives, and we suggest Southern Ocean sponge material would form a useful additional reference standard for future spicule analyses.

Silicon nanocrystal synthesis by implantation of natural Si isotopes

2010 ◽  
Vol 130 (4) ◽  
pp. 669-673 ◽  
Author(s):  
D. Barba ◽  
D. Koshel ◽  
F. Martin ◽  
G.G. Ross ◽  
M. Chicoine ◽  
...  
Keyword(s):  
Silicon Nanocrystal ◽  
Nanocrystal Synthesis ◽  
Si Isotopes

scholarly journals Measurements of Isotopic Abundances in Interstellar Clouds

1980 ◽  
Vol 87 ◽  
pp. 397-404 ◽  
Author(s):  
Arno A. Penzias
Keyword(s):  
Molecular Clouds ◽  
General Framework ◽  
Galactic Center ◽  
Galactic Plane ◽  
Giant Molecular Clouds ◽  
Interstellar Clouds ◽  
The Galaxy ◽  
Isotopic Abundances ◽  
Si Isotopes

While an examination of the available data reveals some seemingly contradictory results, a general framework having the following outlines can be put forward:1. With the exception of the two galactic center sources SgrA and SgrB, the relative isotopic abundances exhibited by the giant molecular clouds in our Galaxy exhibit few, if any, significant variations from the values obtained by averaging the data from all these sources.2. The 13C/12C and 14N/15N abundance ratios are ∼130% and ∼150%, respectively, of their terrestrial values throughout the galactic plane and somewhat higher, ∼300%, near the galactic center.3. The 16O/18O and 17O/18O abundance ratios are ∼130% and ∼160%, respectively, of their terrestrial values throughout the Galaxy, although the former may be somewhat lower near the galactic center.4. The S and Si isotopes have generally terrestrial abundances.

Beta-Activity ofSi31and the Masses of the Al and Si Isotopes

1952 ◽  
Vol 85 (3) ◽  
pp. 501-502 ◽  
Author(s):  
Henry T. Motz
Keyword(s):  
Beta Activity ◽  
Si Isotopes ◽  
The Masses

scholarly journals Firm spin and parity assignments for high-lying, low-spin levels in stable Si isotopes

2020 ◽  
Vol 56 (4) ◽  
Author(s):  
J. Sinclair ◽  
M. Scheck ◽  
S. W. Finch ◽  
Krishichayan ◽  
U. Friman-Gayer ◽  
...  
Keyword(s):  
Si Isotopes

scholarly journals Silicic acid biogeochemistry in the Gulf of California: Insights from sedimentary Si isotopes

2012 ◽  
Vol 27 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Laetitia Pichevin ◽  
Raja S. Ganeshram ◽  
Ben C. Reynolds ◽  
Fredrick Prahl ◽  
Thomas F. Pedersen ◽  
...  
Keyword(s):  
Silicic Acid ◽  
Gulf Of California ◽  
Si Isotopes

scholarly journals The evolution of stable silicon isotopes in a coastal carbonate aquifer, Rottnest Island, Western Australia

2020 ◽  
Author(s):  
Ashley N. Martin ◽  
Karina Meredith ◽  
Andy Baker ◽  
Marc D. Norman ◽  
Eliza Bryan
Keyword(s):  
Western Australia ◽  
Isotope Analysis ◽  
Inverse Correlation ◽  
Silicon Isotopes ◽  
Low Concentrations ◽  
Groundwater Samples ◽  
Si Isotopes ◽  
Dissolved Silicon ◽  
Si Isotope ◽  
Few Data

Abstract. Dissolved silicon (DSi) is a key nutrient in the oceans, but there are few data available regarding Si isotopes in coastal aquifers. Here we investigate the Si isotopic composition of 12 fresh and 17 saline groundwater samples from Rottnest Island, Western Australia, which forms part of the world’s most extensive aeolianite deposit (the Tamala Limestone Formation). Two bedrock samples were also collected from Rottnest Island for Si isotope analysis. The δ30Si values of groundwaters ranged from −0.39 to +3.60 ‰ with an (average: +1.59 ‰) and the rock samples were −0.76 and −0.13 ‰. Due to the relatively low concentrations of DSi (64 to 196 μM) and clay-forming cations in fresh groundwaters, the correlation between δ30Si values and DSi concentrations (ρ = 0.59, p = 0.02) may be explained by Si adsorption onto Fe-Al (oxy)hydroxides present in the aquifer. An increase in groundwater δ30Si in association with the occurrence of water-rock interactions may explain the spatial pattern in δ30Si across the aquifer, and is consistent with the correlation between δ30Si and tritium activities when considering all groundwaters (ρ = −0.68, p = 0.0002). In the deeper aquifer, the inverse correlation between DSi and Cl concentrations (ρ = −0.79, p = 0.04) for the more saline groundwaters is attributed to groundwater mixing with local seawater that is depleted in DSi (

scholarly journals Assessment of C, N and Si isotopes as tracers of past ocean nutrient and carbon cycling

2021 ◽  
Author(s):  
J. R. Farmer ◽  
J. E. Hertzberg ◽  
D. Cardinal ◽  
S. Fietz ◽  
K. Hendry ◽  
...  
Keyword(s):  
Carbon Cycling ◽  
Si Isotopes
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