Grain determination

Whilst the shape of a propellent grain determines the constancy or otherwise of the burning process, the actual time occupied depends on the grain dimensions. The term web thickness is used to denote the shortest distance in a grain through which burning can go to completion it is... 

Olsson, J., Borjesson, T., Lundstedf T., Schnurer, J. (2000) Volatiles for mycological quality grading of barley grains determinations using gas chromatography-mass spectrometry and electronic nose. Inf J. Food Microbiol. 59 167-178. 

Fig. 7. Interstellar UV radiation field in the vicinity of the sun, estimated by Witt and Johnson (1972) on the basis of the albedo of dust grains determined from OAO-2 observations...

The XRD studies of the interfacial transition zone (material produced by abrasion of paste layers) [16], as well as the SEM observations with EDS analysis [16] revealed the presence of transition zone surrounding the aggregate grains, determined by Maso as an aureole [ 10]. This relates to the former water film around the aggregate. This area shows higher w/c ratio and subsequently cement components can readily dissolve, as well as the hydration products crystallize from the solution. Calcium hydroxide crystallizes in this interfacial transition zone and the crystals are oriented in such a way that their (001) axis is perpendicular to the surface of aggregate, as it was reported by Barnes et al. [17]. The C-S-H is then formed and the two products occur together as a duplex film about 1 pm thick (Fig. 6.7). 

Table 10.14 Dynamic spectral efficiency of a fuel-rich binary Mg/PTFE grain determined from Type 400 Mk 2 Flare cartridge configuration at two altitudes at different wind speeds [62].

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