scholarly journals Final technical report: The effect of physical and chemical heterogeneities in a porous medium on the transport of bacteria

2001 ◽  
Author(s):  
George M. Hornberger ◽  
Aaron L. Mills ◽  
Janet S. Herman
Keyword(s):  
Porous Medium ◽  
Technical Report ◽  
Physical And Chemical ◽  
Transport Of Bacteria

scholarly journals On the Advanced Technique of Mathematical and Computer Simulation of Filtration Processes in Porous Media under the Influence of Physical and Chemical Factors

2019 ◽  
pp. 33-34
Author(s):  
Volodymyr Gerus
Keyword(s):  
Computer Simulation ◽  
Porous Medium ◽  
Porous Media ◽  
Advanced Technique ◽  
Variable Porosity ◽  
Continuity Equations ◽  
Mathematical And Computer Simulation ◽  
Chemical Factors ◽  
Physical And Chemical

The proposed improvement of the technique for deriving filtration equations in soils with variable porosity is described. The technique is based on the application of the apparatus of complete derivatives in the soil phase continuity equations. Examples of filtration equations in the case of a deformable and non-deformable skeleton of a porous medium are given.

Isotope-abundance variations of selected elements (IUPAC Technical Report)

2002 ◽  
Vol 74 (10) ◽  
pp. 1987-2017 ◽  
Author(s):  
Tyler B. Coplen ◽  
John Karl Böhlke ◽  
P. De Bièvre ◽  
T. Ding ◽  
N. E. Holden ◽  
...  
Keyword(s):  
Chemical Elements ◽  
Radioactive Decay ◽  
Atomic Weight ◽  
Chemical Fractionation ◽  
Isotope Abundance ◽  
Isotopic Compositions ◽  
Technical Report ◽  
Isotopic Abundances ◽  
Calcium Iron ◽  
Physical And Chemical

Documented variations in the isotopic compositions of some chemical elements are responsible for expanded uncertainties in the standard atomic weights published by the Commission on Atomic Weights and Isotopic Abundances of the International Union of Pure and Applied Chemistry. This report summarizes reported variations in the isotopic compositions of 20 elements that are due to physical and chemical fractionation processes (not due to radioactive decay) and their effects on the standard atomic-weight uncertainties. For 11 of those elements (hydrogen, lithium, boron, carbon, nitrogen, oxygen, silicon, sulfur, chlorine, copper, and selenium), standard atomic-weight uncertainties have been assigned values that are substantially larger than analytical uncertainties because of common isotope-abundance variations in materials of natural terrestrial origin. For 2 elements (chromium and thallium), recently reported isotope-abundance variations potentially are large enough to result in future expansion of their atomic-weight uncertainties. For 7 elements (magnesium, calcium, iron, zinc, molybdenum, palladium, and tellurium), documented isotope variations in materials of natural ter- restrial origin are too small to have a significant effect on their standard atomic-weight uncertainties. This compilation indicates the extent to which the atomic weight of an element in a given material may differ from the standard atomic weight of the element. For most elements given above, data are graphically illustrated by a diagram in which the materials are specified in the ordinate and the compositional ranges are plotted along the abscissa in scales of (1) atomic weight, (2) mole fraction of a selected isotope, and (3) delta value of a selected isotope ratio.

Impacts of Physical and Chemical Heterogeneity on Cocontaminant Transport in a Sandy Porous Medium

1996 ◽  
Vol 32 (4) ◽  
pp. 801-818 ◽  
Author(s):  
Andrew F. B. Tompson ◽  
Annette L. Schafer ◽  
Robert W. Smith
Keyword(s):  
Porous Medium ◽  
Chemical Heterogeneity ◽  
Physical And Chemical

scholarly journals Isotope-abundance variations and atomic weights of selected elements: 2016 (IUPAC Technical Report)

2016 ◽  
Vol 88 (12) ◽  
pp. 1203-1224 ◽  
Author(s):  
Tyler B. Coplen ◽  
Yesha Shrestha
Keyword(s):  
Chemical Elements ◽  
Radioactive Decay ◽  
Atomic Weight ◽  
Upper And Lower Bounds ◽  
Chemical Fractionation ◽  
Lower And Upper Bounds ◽  
Technical Report ◽  
Isotopic Abundances ◽  
Physical And Chemical ◽  
Boron Carbon

AbstractThere are 63 chemical elements that have two or more isotopes that are used to determine their standard atomic weights. The isotopic abundances and atomic weights of these elements can vary in normal materials due to physical and chemical fractionation processes (not due to radioactive decay). These variations are well known for 12 elements (hydrogen, lithium, boron, carbon, nitrogen, oxygen, magnesium, silicon, sulfur, chlorine, bromine, and thallium), and the standard atomic weight of each of these elements is given by IUPAC as an interval with lower and upper bounds. Graphical plots of selected materials and compounds of each of these elements have been published previously. Herein and at the URL http://dx.doi.org/10.5066/F7GF0RN2, we provide isotopic abundances, isotope-delta values, and atomic weights for each of the upper and lower bounds of these materials and compounds.

scholarly journals Effect of motility on the transport of bacteria populations through a porous medium

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Adama Creppy ◽  
Eric Clément ◽  
Carine Douarche ◽  
Maria Veronica D'Angelo ◽  
Harold Auradou
Keyword(s):  
Porous Medium ◽  
Transport Of Bacteria

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

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