Enrichment of the impurities allows the use of simpler and less expensive analytical instruments for hydrogen quality monitoring and certification purposes.
Whilst composite materials are now widely used in aircraft structural components for certification purposes current designs are such that any delamination/disbond will not grow.
New test responses called "envelope curves" are proposed and are obtained by following a load path that allows the behavior of the notched structure to be validated for certification purposes.
These proposed test times are significantly longer than previous laboratory studies, however, for certification purposes, it is argued that the dust lifting behaviour should be examined over the full timescales of an actual explosion scenario.
Based on an extensive database comprising more than 9000 test results carried out for certification purposes, analyses were carried out in order to develop more reliable input parameters for the design of nailed joints.
The specific probe hybridization pattern obtained from each virus makes this approach a powerful tool for high throughput plant certification purposes and also for virus discovery if the new viral genomic sequences have partial similarity with the microarray probes.
This study focus on the probabilistic modelling of mechanical properties of prestressing strands based on data collected from tensile tests carried out in Laboratório Nacional de Engenharia Civil (LNEC), Portugal, for certification purposes, and covers a period of about 9 years of production.
The feasibility, face validity, and construct validity of this model have been demonstrated [11, 12, 13], and together with other tools (i.e., SUTT model, HYSTT model, E-Knot model, The Winner Project [14]), the LASTT model is also currently used for certification purposes [3, 4, 15, 16].
In fact, in many engineering applications, structures are required to be tested for clearance or certification purposes (e.g. hardware items on helicopters): if an AVM has been selected on the basis of its nominal stiffness its choice may present problems when these are excited at high amplitude of vibration, when the nonlinear behaviour becomes pronounced.
