Pyramidal provision

At the top of the data collection pyramid shown in Figure 5.1 is assessment. By the time the data collection process enters assessment, its third and final phase, the provisions made in the planning phase have been already implemented in the field and at the laboratory as the requirements for sampling, analysis, and QA/QC activities. In the assessment phase, by conducting Task 6—Data Evaluation and Task 7—Data Quality Assessment, we will establish whether the collected data are valid, relevant, and may be used for project decisions. 

A comprehensive package of interventions at the primary, secondary and tertiary levels needs to be provided by the workplace organization and its occupational health services, aimed at reducing occupational stress. It is envisaged that the provision of these interventions would have a pyramidal structure, as illustrated in Figure 17.1, with the interventions nearer the apex of the pyramid requiring more specialist therapeutic input for relatively fewer employees. 

Different crystallographic planes of a semiconductor electrode usually exhibit different reaction kinetics. It was found in III-V compounds in indifferent electrolytes that the (lll)B face terminated with the anion plane (P, As) etched faster than the (lll)A face containing the cations (Ga, In) [47]. The planes composed entirely of metal atoms react more slowly than any other crystal plane because of the stable metal oxide layer, which can be formed on such planes. Consequently on these planes termed etch stop planes, provision of reactants (diffusion control) is not rate-limiting. In Si, the (100) planes are known to etch faster than (111) planes in alkaline solutions. This property is at the origin of various apphcations, such as texturization of silicon surface [formation of pyramids on (100) planes], which allows reduction of reflectivity of the front surface of solar cells and Si micromachining [48]. The semiconductor surface may be shaped during the anodic dissolution... 

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