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The relative abundance of magnesium is related to the fact that it is easily built up in supernova stars from a sequential addition of three helium nuclei to carbon ( which in turn is made from three helium nuclei ).
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relative and abundance
The relative atomic mass ( historically and commonly also called " atomic weight ") of an element is the average of the atomic masses of all the chemical element's isotopes as found in a particular environment, weighted by isotopic abundance, relative to the atomic mass unit ( u ).
As with the isotopes of other elements, a variety of processes fractionate, or alter the relative abundance of, calcium isotopes.
In high southern hemisphere latitudes, such as New Zealand and Antarctica the mass die-off of flora caused no significant turnover in species, but dramatic and short-term changes in the relative abundance of plant groups.
This ion-exchange process is the basis of the " negative europium anomaly ", the low europium content in many lanthanide minerals such as monazite, relative to the chondritic abundance.
Elton defined ecological relations using concepts of food chains, food cycles, and food size, and described numerical relations among different functional groups and their relative abundance.
Thus, ecosystem processes are driven by the number of species in an ecosystem, the exact nature of each individual species, and the relative abundance organisms within these species.
For those gases, the relative radiative forcing will depend upon abundance and hence upon the future scenario adopted.
Tacticity measurements obtained by Carbon-13 NMR are typically expressed in terms of the relative abundance of various pentads within the polymer molecule, e. g. mmmm, mrrm.
The average meso sequence length may be approximated from the relative abundance of pentads as follows:
Specialized archaeologists called palaeoethnobotanists, relying on data such as the relative abundance of charred grains found in archaeological sites, hypothesize that the cultivation of millets was of greater prevalence in prehistory than rice, especially in northern China and Korea.
Clarke has calculated the relative abundance of the principal rock-forming minerals with the following results: apatite = 0. 6, titanium minerals = 1. 5, quartz = 12. 0, feldspars = 59. 5, biotite = 3. 8, hornblende and pyroxene = 16. 8, total = 94. 2 %.
Observations are made in the field using carefully designed protocols and the data may be analysed to estimate bird diversity, relative abundance or absolute population densities.
In particular, the relative abundance of europium compared to the other REE is often markedly higher or lower, and called the europium anomaly.
Sandstone classification schemes vary widely, but most geologists have adopted the Dott scheme, which uses the relative abundance of quartz, feldspar, and lithic framework grains and the abundance of muddy matrix between these larger grains.
: The relative abundance of sand-sized framework grains determines the first word in a sandstone name.
Cosmic rays are enriched in lithium, beryllium, and boron with regard to the relative abundance of these elements in the universe compared to hydrogen and helium, and thus are thought to have a primary role in the synthesis of these three elements through the process of " cosmic ray nucleosynthesis ".
Chief nuclear reactions responsible for the abundance of the chemical elements | relative abundances of light atomic nucleus | atomic nuclei observed throughout the universe.
This technique is also widely used the field of radiometric dating, in which it is used to analyze relative abundance of different isotopes.
relative and magnesium
Since magnesium is less dense than aluminium, these alloys are prized for their relative lightness and strength.
However, the relative abundance of calcite-and aragonite-using lineages does not reflect subsequent seawater chemistry – the magnesium / calcium ratio of the oceans appears to have a negligible impact on organisms ' success, which is instead controlled mainly by how well they recover from mass extinctions.
relative and is
Says he, `` I may never imagine that in the struggle between personal and supra-personal responsibility it is possible to make a compromise between the ethical and the purposive in the shape of a relative ethic ; ;
A relative newcomer in outdoor signs is Mylar polyester film, now used as a printed overlay for trans-illuminated signs ( see below ).
The result of the observations is Af where the phase angle, Q, is measured in degrees from new moon and the probable errors include absolute as well as relative errors.
There is another means which should show the direction and relative value of the stresses in viscoelastic fluids that is not mentioned as such in the literature, and that is the shape of the suspended drops of low viscosity fluids in shear fields.
The relative forces can be calculated from the various radii of curvature if we assume: ( A ) The surface tension is uniform on the surface of the drop.
The last column shows the rate of exchange that would have been observed at a relative intensity of 4 ( 14.7 cm. distance ) calculated on the assumptions that the incident light intensity is inversely proportional to the square of the distance of the lamp from the cell and that the rate is directly proportional to the incident light intensity.
If such is the case, the particles within a distance of about Af of the Earth will have, relative to the Earth, a kinetic energy less than their potential energy and they will be captured into orbits about the Earth.
One issue that must be faced is the relative difficulty of analysis of different phonologic subsystems.
For the purposes of this discussion, the problem of relative prices is encompassed in these two variables, since GNP includes other prices.
This is stated to emphasize the necessity for an over-all concept of submarine defense, one which would provide positions of relative importance to ASW elements based on projected potentialities.
The concept of unity, in which positive and negative are attributes of the same force, in which good and evil are relative, ever-changing, and always joined to the same phenomenon -- such a concept is still reserved to the physical sciences and to the few who have grasped the history of ideas.
To understand American politics is, simply, to know people, to know the relative weight of names -- who are heroes, who are straw men, who controls, who does not.
Thus, giving grades and promotions based only on an individual's performance relative to a small local group, as is common, may reduce cooperative behaviors in the group.
This is the notion that particular cultures should not be judged by one culture's values or viewpoints, but that all cultures should be viewed as relative to each other.
The last stage in the development of the Kouros type is the late archaic period ( 520 – 485 BC ), in which the Greek sculpture attained a full knowledge of human anatomy and used to create a relative harmonious whole.
The emphasis is given in anatomy, and it is one of the first attempts to represent a kind of motion, and beauty relative to proportions, which appear mostly in post-Archaic art.
In the Pollard script, an abugida, vowels are indicated by diacritics, but the placement of the diacritic relative to the consonant is modified to indicate the tone.
Following each individual brick should be a layer of adobe mortar, recommended to be at least an inch thick to make certain there is ample strength between the brick ’ s edges and also to provide a relative moisture barrier during the seasons where the arid climate does produce rain.
This means that the programmer must know a " language " that is effective relative to the target computing agent ( computer / computor ).