6 research outputs found
Dielectric and conductivity relaxation in mixtures of glycerol with LiCl
We report a thorough dielectric characterization of the alpha relaxation of
glass forming glycerol with varying additions of LiCl. Nine salt concentrations
from 0.1 - 20 mol% are investigated in a frequency range of 20 Hz - 3 GHz and
analyzed in the dielectric loss and modulus representation. Information on the
dc conductivity, the dielectric relaxation time (from the loss) and the
conductivity relaxation time (from the modulus) is provided. Overall, with
increasing ion concentration, a transition from reorientationally to
translationally dominated behavior is observed and the translational ion
dynamics and the dipolar reorientational dynamics become successively coupled.
This gives rise to the prospect that by adding ions to dipolar glass formers,
dielectric spectroscopy may directly couple to the translational degrees of
freedom determining the glass transition, even in frequency regimes where
usually strong decoupling is observed.Comment: 8 pages, 7 figure
March 2003
A long standing goal in image-based modeling and rendering is to capture a scene from camera images and construct a su#cient model to allow photo-realistic rendering of new views. With the confluence of computer graphics and vision, the combination of research on recovering geometric structure from un-calibrated cameras with modeling and rendering has yielded numerous new methods. Yet, many challenging issues remain to be addressed before a su#ciently general and robust system could be built to e.g. allow an average user to model their home and garden from cam-corder video
Has the Historian’s craft gone digital? Some observations from France
Since the end of the 1980s the historiographical context has changed considerably. Over the course of the last ten years, we have reached the “digital age” and computers as well as resources available via the Internet have become indispensable tools for all researchers. Be it for the stage of documentation or for actual writing, we are now living and working in a context where historians can no longer completely refuse all IT tools. As long as there are no solid, durable, large-scale training efforts to equip all historians with the skills to use the new and old IT tools, their potential is necessarily limited. While there have been studies on “researchers” in general and also on political scientists in particular, there has, to our knowledge, been no scientific study which would allow us to reach conclusions on the use of IT tools and digital resources by French historians. It is thus difficult to reach conclusions on a larger scale and we have decided to base our analysis on our own experience in order to consider what could be the transformations of the historian’s craft in the digital age. We will thus proceed first to a series of conclusions based on our activities in mediation (teaching and blogging), before proposing a typology of the principal evolutions. We will conclude with a certain number of propositions as far as training of historians is concerned