Evaluation of SSRT-Test by Classical Gravimetric Analysis and Optical Topographic Measurement: A Comparative Study

To establish a database of performance values in the small-scale shock reactivity test (SSRT), common secondary explosives based on organic nitrates (e. g. PETN) and nitramines (e. g. RDX and HMX) as well as aromatic (e. g. TNT), heteroaromatic (e. g. TKX-50 and MAD-X1) and open chain systems (e. g. FOX-7) were investigated. The evaluation of the test results was carried out by two different methods. On the one hand, manually by weighing out the resulting dents with sand, and on the other hand, optically with the aid of a profilometer. The two analysis methods were compared and evaluated with respect to their absolute results and absolute as well as relative standard deviations

Early Cretaceous vegetation and climate change at high latitude: Palynological evidence from Isachsen Formation, Arctic Canada

Quantitative palynology of the marginal marine and deltaic-fluvial Isachsen Formation of the Sverdrup Basin, Canadian Arctic, provides insight into high latitude climate during much of the Early Cretaceous (Valanginian to early Aptian). Detrended Correspondence Analysis of main pollen and spore taxa is used to derive three ecological groupings influenced by moisture and disturbance based on the botanical affinities of palynomorphs: 1) a mixed coniferous assemblage containing both lowland and upland components; 2) a conifer-filicopsid community that likely grew in dynamic lowland habitats; and, 3) a mature dry lowland community composed of Cheirolepidiaceans. Stratigraphic changes in the relative abundance of pollen and spore taxa reflect climate variability in this polar region during the ~20 Mya history of the Isachsen Formation. The late Valanginian was relatively cool and moist and promoted lowland conifer-filicopsid communities. Warming in the Hauterivian resulted in the expansion coniferous communities in well-drained or arid hinterlands. A return to relatively cool and moist conditions in the Barremian resulted in the expansion of mixed lowland communities. This work demonstrates the utility of a multivariate statistical approach to palynology to provide insight into the composition and dynamics of ecosystems and climate of high latitude regions during the Early Cretaceous

Euphorbioxylon ortenburgense n. sp. from the East Bavarian Molasse with disjunctive ray cell walls

Volume: 38Start Page: 259End Page: 27