If we fix the thickness of the film and vary the dielectric constant, we find the oscillating amplitude of the cross section is also changed. With the increase in the dielectric
constant, the oscillating amplitude in the cross section becomes increased first and then gets decreased. This study provides a new understanding and will guide the future experiment study on the photodetachment process of negative ion in the presence of a coarse metal surface. (c) 2011 American Institute of Physics. [doi:10.1063/1.3489916]“
“Understanding the survival value of behaviour does not tell us how the mechanisms that control this behaviour work. Nevertheless, understanding survival value can selleck guide the study of these mechanisms. In this paper, we apply this principle to understanding the
cognitive mechanisms that support cache retrieval in scatter-hoarding animals. We believe it is too simplistic to predict that all scatter-hoarding animals will outperform non-hoarding animals on all tests of spatial memory. Instead, we argue that we should look at the detailed ecology and natural history of each species. This understanding of natural history then allows us to make predictions about which aspects of spatial memory should be better in which species. We use the natural hoarding behaviour of the three best-studied groups of scatter-hoarding animals to make predictions about three aspects of their spatial memory: duration, capacity
and spatial resolution, and we test these predictions against the existing this website literature. Having laid out how ecology and natural history can be used to predict detailed cognitive abilities, we then suggest using this check details approach to guide the study of the neural basis of these abilities. We believe that this complementary approach will reveal aspects of memory processing that would otherwise be difficult to discover.”
“The influence of the addition of high-impact polystyrene (HIPS) on polypropylene (PP) photodegradation was studied with blends obtained by extrusion with and without styrene-butadiene-styrene (SBS) copolymer (10 wt % with respect to the dispersed phase). The concentrations of HIPS ranged from 10 to 30 wt %. The blends and pure materials were exposed for periods of up to 15 weeks of UV irradiation; their mechanical properties (tensile and impact), fracture surface, and melt flow indices were monitored. After 3 weeks of UV exposure, all of the materials presented mechanical properties of the same order of magnitude. However, for times of exposure greater than 3 weeks, an increasing concentration of HIPS resulted in a better photostability of PP. These results were explained in light of morphological observations. This increase of photostability was even greater when SBS was added to the blends.