Online research in philosophy

Members of the Ba2Zn1-xCdxTa2O9 <span class='Hi'>span>(0 <span class='Hi'>span>=<<span class='Hi'>span> x <span class='Hi'>span>=<<span class='Hi'>span> 1)<span class='Hi'>span> series (...) class='Hi'> have been synthesized by solid state reactions at 1473 K.<span class='Hi'>span> Powder x-ray diffraction studies show a cubic perovskite cell with a <span class='Hi'>span>~ 4.1 a which increases with increase in x.<span class='Hi'>span> Electron diffraction studies show the presence of hexagonal ordered perovskite structure in addition to the cubic structure seen by x-rays,<span class='Hi'>span> the x <span class='Hi'>span>= 0.5 composition showing more ordered crystallites.<span class='Hi'>span> These samples show high dielectric constants with a maximum <span class='Hi'>span>(r <span class='Hi'>span>= 30 at 1 kHz)<span class='Hi'>span> for the x <span class='Hi'>span>= 0.5 member.<span class='Hi'>span> The dielectric loss increases with increase in x at all the frequencies under study. (shrink)

We consider an electron in a 1 D random adiabatically changing potential. We demonstrate that the positions of the maxima of an electron eigenstate probability density do (...) not move even when the change of the potential is significant. We show that at the same time the main maximum hops by a distance of the order of the size of the system. We present arguments that such hopping of electron localization position happens also in two and three dimensions. (shrink)

The American Journal of Bioethics, Volume 12, Issue 6, Page 56-58, June 2012.

Group selection is increasingly being viewed as an important force in human evolution. This paper examines the views of R.D. Alexander, one of the most influential (...) class='Hi'>thinkers about human behavior from an evolutionary perspective, on the subject of group selection. Alexander's general conception of evolution is based on the gene-centered approach of G.C. Williams, but he has also emphasized a potential role for group selection in the evolution of individual genomes and in human evolution. Alexander's views are internally inconsistent and underestimate the importance of group selection. Specific themes that Alexander has developed in his account of human evolution are important but are best understood within the framework of multilevel selection theory. From this perspective, Alexander's views on moral systems are not the radical departure from conventional views that he claims, but remain radical in another way more compatible with conventional views. (shrink)