Global sampling

So, when in a multiphase sample, it is possible to separate the contribution to the diffraction pattern of each phase (F j)). Relation (26) permits the evaluation of the relative weight fractions Wi if the chemical compositions of the phases and of the global sample are known ... 

In contrast to measures of convergence that reflect a single local observable, for example, a torsion angle, some methods focus on the global sampling quality. For a simulation of a macromolecule, the distinction would be between asking "how well do I know this particular quantity " and "how well have I explored the conformational space of the molecule " The latter question is critical, in that if the conformational space is well sampled, most physical quantities should be known well. 

The last years showed a significant trend toward the exploitation of rapid and economic analytical devices able to provide multiple information about samples. Among these, the so-called artificial tongues represent effective tools which allow a global sample... 

The data in Table III indicate that the presence of PAH in the environment is worldwide. Only two samples [one from a coarse, sandy, desert like environment (Nevada soil, Sample 30) and the other the freeze-dried remains of a still living algal layer from the lagoon of a South Pacific atoll (Hao 232, Sample 34)] were found to contain no PAH above blank levels. The concentrations of PAH in these global samples vary drastically, however. The total concentration of nonalkylated three-to-five-ring PAH ranges from less than 1 ppb (Samoan soils and an... 

Based on the number of sample regions and the number of samples per region suggested above, a global sampling program with 3 or 4 depths and 3 or 4 size fractions per sample would require between 200,000 and 300,000 individual analyses of carbon... 

The estimate for excess ferric iron in hard rocks is problematic, as we do not have good global sampling of the middle and deep crust. The estimates compiled by Lecuyer and Ricard [15] extrapolate near surface ferric/ferrous ratios [equivalent to an excess of 3% Fe203 (by mass)] downward to 35 km depth. This may lead to an overestimate as the fraction of rocks that have been exposed to oxidation at the surface should decrease with depth. 

GRAM L, MELCHIORSEN J and BRUHN I B (2010) Antibacterial activity of marine cultur-able bacteria collected from a global sampling of ocean surface waters and surface swabs of marine organisms, 7 Mar Biotechnol, 12,439-451. 

Eigenvalues and Percentage Variance Explained for the First Three Principal Components of the PCA Conducted on the Global Sample of O. excavata P, Elements... 

This method has the advantage of mixing the enhanced global sampling of a high temperature MC walk with the effective local sampling of a low temperature MC walk. It has been shown to be quite effective and can readily be applied to the simulated annealing of proteins and peptides. 

The leverage and residual weights are combined in one global sample weight as follows ... 

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