Measurement strategies

CFN (1992). Workplace atmospheres — Guidance for the assessment of exposure by inhalation to chemical agents for comparison with limit values and measurement strategy. EN 689. 

Finally, for situations in which it is not clear that exposure is and will continue to be below the limit values, a detailed survey with a measurement strategy is required. The methods used are based mostly on instruments for sampling the environment in order to obtain reliable measurements of workplace air concentrations. In general, the measurement strategy must consider the most efficient use of resources for the purpose of obtaining quantitative data on exposures by having a clear idea of what the data will be used for or whether it meets the specified need. For example, if the data pertain to peak exposures, these peaks have to be assessed according to the STEL requirements, if any. 

We shall present, in the following sections, two complementary measurement strategies which allow the value of this variance to be minimised. The first concerns the technique by which the measuring time is divided between the two polarisation states, and the second minimises the variance by determining an optimal division of the counting times. 

Figures 4.9(a) and (b) show two measurement strategies for measuring Su. One is a Bunsen burner and the other is a burner described by Botha and Spalding [6]. In the...

Unsaturation, in oils, 10 826 Unsensitization phenomenon, 19 237 Unshaped refractories, 6 491 Unslaked lime, 15 29 Unstabilized liquid sulfur trioxide, 23 517 Unstable angina, 5 109 Unstable flows, 11 761-765 Unstable node, in separating nonideal liquid mixtures, 22 303 Unstable nodes, residue curve maps, 8 790 Unstable reagents, measurement strategies for, 14 621... 

In the case of defining a measurement strategy that bears a meaningful relationship to the property of interest, the aim of the evaluation is to guide the researcher to materials with the most interesting behavior. The initial screen need not be thorough nor definitive but must be indicative. A limited subset of candidate materials... 

It is this diversity of metabolites that presents the most difficult challenge. There are not only a variety of metabolites but they are also dynamic spatially and temporally. To master a universal "omics" approach, one has to have several measurement strategies. For example, a suite of quantitative methods analyzing key metabolites from different biochemical pathways and metabolic "fingerprinting" that compares patterns like multidimensional hierarchical clustering or principal cluster analysis.9... 

Gas-phase MR will undoubtedly find more widespread use in studies of catalysts and catalytic reactors initial studies have been done with thermally polarized gases. Clearly, it will be of interest to image gas flows in reactors in this application, the measurement strategies used to image gas and liquid flows will be similar. However, gas- and liquid-phase species diffusing within a porous catalyst will be influenced to differing extents by the physical and chemical characteristics of the catalyst. These... 

Following the great success in developing an adequate measurement strategy for stratospheric constituents, the challenges for remote the sensing community are... 

ROA is also manifest as a small circularly polarized component in the scattered beam using incident light with a fixed polarization state (including unpolarized) [1, 13, 18-20]. Within the far-from-resonance approximation, this circular component (SCP ROA) is measured as (/R — IL) / (/R + /L), where /r and /l represent the intensities of the right- and left-circularly polarized components, respectively, of the scattered light, provides equivalent information and identical spectra to the CID measurement (ICP ROA). Other ROA measurement strategies are possible and are described elsewhere [18, 21, 22]. 

For the optimum measurement strategy of operational stability, Lee et al. have calculated the time-dependent profile of addition of fresh, unactivated enzyme into a CSTR at different deactivation kinetics (Table 5.5). 

ISO/FDIS (2007) 16000-5. Indoor Air-Part 5 Measurement Strategy for Volatile Organic Compounds (VOCs), International Organization for Standardization, Geneva, Switzerland. 

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