scholarly journals ON UNIVERSALLY STABLE ELEMENTS

1997 ◽  
Vol 48 (4) ◽  
pp. 493-498 ◽  
Author(s):  
IAN J. LEARY ◽  
BJ$$$RN SCHUSTER ◽  
NOBUAKI YOGITA
Keyword(s):  
Stable Elements

Radionuclides and stable elements in vegetation in Australian arid environments: Concentration ratios and seasonal variation

2021 ◽  
Vol 234 ◽  
pp. 106627
Author(s):  
Maria Angelica D. Rea ◽  
Mathew P. Johansen ◽  
Timothy E. Payne ◽  
Gillian Hirth ◽  
Jim Hondros ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Arid Environments ◽  
Stable Elements ◽  
Concentration Ratios

scholarly journals On graded centres and block cohomology

2009 ◽  
Vol 52 (2) ◽  
pp. 489-514 ◽  
Author(s):  
Markus Linckelmann
Keyword(s):  
Triangulated Categories ◽  
Nilpotent Ideal ◽  
Stable Elements ◽  
Block Algebra

AbstractWe extend the group theoretic notions of transfer and stable elements to graded centres of triangulated categories. When applied to the centre Z*(Db(B) of the derived bounded category of a block algebra B we show that the block cohomology H*(B) is isomorphic to a quotient of a certain subalgebra of stable elements of Z*(Db(B)) by some nilpotent ideal, and that a quotient of Z*(Db(B)) by some nilpotent ideal is Noetherian over H*(B).

Distribution of radiocesium and stable elements within a pine tree

2011 ◽  
Vol 146 (1-3) ◽  
pp. 326-329 ◽  
Author(s):  
S. Yoshida ◽  
M. Watanabe ◽  
A. Suzuki
Keyword(s):  
Pine Tree ◽  
Stable Elements

Analysis of metamaterial bi-stable elements as energy dissipation systems

2019 ◽  
Vol 15 (4) ◽  
pp. 151-159
Author(s):  
Yasser Darwish ◽  
Mohamed ElGawady
Keyword(s):  
Energy Dissipation ◽  
Stable Elements

scholarly journals DNA IN GAMETOGENESIS AND EMBRYOGENY IN TRADESCANTIA

1956 ◽  
Vol 2 (6) ◽  
pp. 765-776 ◽  
Author(s):  
John W. Woodard
Keyword(s):  
Cell Division ◽  
Basic Unit ◽  
Quantitative Stability ◽  
Stable Elements ◽  
Dna Amounts ◽  
Tradescantia Paludosa ◽  
Methods Of Measurement

A microphotometric study of various Feulgen-stained gametophytic and sporophytic nuclei of Tradescantia paludosa was made to test the hypothesis that DNA is maintained in multiples of a basic unit within all cells of an organism. A multiple relationship was found in all tissues analyzed. The lowest amount of DNA was found in gametophytic nuclei, approximately twice and four times this amount in sporophytic nuclei, and approximately three and six times this amount in endosperm nuclei. Intermediate amounts of DNA were found only in tissues presumably undergoing an interphase synthesis of DNA preceding either cell division or endomitosis. It is concluded that within the limitations of present methods of measurement, DNA amounts show a quantitative behavior which supports the "constancy" hypothesis. Such quantitative stability of DNA gives support to the concept that DNA is associated with the stable elements of the gene.

Characterization of Plutonium Contaminated Soils From the Nevada Test Site for Remediation Method Selection

2003 ◽  
Author(s):  
Guilhermina Torrao ◽  
Robert Carlino ◽  
Steve L. Hoeffner ◽  
James D. Navratil
Keyword(s):  
Heat Treatment ◽  
Magnetic Separation ◽  
Contaminated Soil ◽  
Manganese Oxides ◽  
Test Site ◽  
Magnetic Fraction ◽  
Nevada Test Site ◽  
Size Separation ◽  
Stable Elements ◽  
Remediation Process

Plutonium (239/240Pu) contamination in soils is an environmental concern at many U.S. Department of Energy (DOE) sites. Remediation actions have been attempted using different technologies, and clean-up plans have been implemented at several sites, such as the Nevada Test Site (NTS). During the 1950’s and early 1960’s, nuclear weapons testing at and near the NTS resulted in soil contaminated with plutonium particles. Clean-up efforts are continuing using conventional remediation techniques. However, the DOE desires to obtain technologies that can further reduce risks, reduce clean-up costs, and reduce the volume of contaminated soil for disposal. Low levels of plutonium contamination are distributed somewhat uniformly throughout the NTS soils and, as a result, it is difficult to obtain volume reductions above 70%. The subject of this research was to characterize the plutonium-contaminated soil from the Tonopah Test Range (TTR) north of the NTS. In order to select remediation methods, it is important to gain a better understanding of how plutonium is bound to the contaminated soil; thus, size separation, magnetic separation, and the sequential extraction (SE) methods were used for this purpose. The SE method consisted of targeting five operationally defined geochemical phases: ion exchangeable, bound to carbonates, bound to iron and manganese oxides (reducible), bound to organic matter, and resistant. Radiometric measurements were used to determine plutonium in each of these defined phases in the soil. Selected stable elements were also determined, to compare the operation of the SE method to other investigators. The SE experiments were performed with two types of samples: soil without heat treatment and soil with heat treatment. The MF treatment was used to destroy the organic content in the soil so as to further evaluate the SE procedure. Particle size analysis indicated that approximately 37% of the TTR soil by weight was larger than 300 micrometers and this fraction contained little plutonium, < 100 pCi/g. Thus, size separation may be useful as part of a remediation process. Magnetic separation tests showed that the magnetic fraction of the TTR soils is very small, and the non-magnetic fraction still contained the majority of the plutonium. Thus, a magnetic separation step in a treatment process would not be useful. Following SE, analysis results of the stable elements agreed with reported values. The SE results also indicated an association of plutonium with the organic and resistant defined phases. The main change in 239/240Pu distribution following heat treatment was an increase of plutonium recovery in the reducible phase. The SE results showed that fairly aggressive chemical treatment would be required if leaching were part of a remediation process.

Sign in / Sign up

Export Citation Format

Share Document