28 research outputs found
Liquid antiferromagnets in two dimensions
It is shown that, for proper symmetry of the parent lattice,
antiferromagnetic order can survive in two-dimensional liquid crystals and even
isotropic liquids of point-like particles, in contradiction to what common
sense might suggest. We discuss the requirements for antiferromagnetic order in
the absence of translational and/or orientational lattice order. One example is
the honeycomb lattice, which upon melting can form a liquid crystal with
quasi-long-range orientational and antiferromagnetic order but short-range
translational order. The critical properties of such systems are discussed.
Finally, we draw conjectures for the three-dimensional case.Comment: 4 pages RevTeX, 4 figures include
Bruno Touschek: particle physicist and father of the electron-positron collider
This article gives a brief outline of the life and works of the Austrian
physicist Bruno Touschek, who conceived, proposed and, 50 years ago, brought to
completion the construction of AdA, the first electron-positron storage ring.
The events which led to the approval of the AdA pro ject and the Franco-Italian
collaboration which con- firmed the feasibility of electron-positron storage
rings will be recalled. We shall illustrate Bruno Touschek's formation both as
a theoretical physicist and as an expert in particle accelerators during the
period be- tween the time he had to leave the Vienna Staat Gymnasium in 1938,
because of his Jewish origin from the maternal side, until he arrived in Italy
in the early 1950s and, in 1960, proposed to build AdA, in Frascati. The events
which led to Touschek's collaboration with Rolf Wideroe in the construction of
the first European betatron will be de- scribed. The article will make use of a
number of unpublished as well as previously unknown documents, which include an
early correspon- dence with Arnold Sommerfeld and Bruno Touschek's letters to
his family in Vienna from Italy, Germany and Great Britain. The impact of
Touschek's work on students and collaborators from University of Rome will be
illustrated through his work on QED infrared radiative corrections to high
energy e+e- experiments and the book Meccanica Statistica.Comment: To be published in EPJ
Propositions for Innovative Forms of Digital Interactive Storytelling Based on Narrative Theories and Practices
This paper takes a look at narrative forms as of yet unexplored in the field of digital interactive storytelling, and proposes methods for how they can be used in engaging ways for the user. Digital Interactive Storytelling, while nearly two decades old as a field of research, has yet to produce a tool capable of producing masses of narratively interesting and engaging pieces for the end user. Although the various prototypes available produce several different story genres, they stem from the same classic narrative form. With this paper, we aim to introduce narrative techniques that have successfully been used in cinema, literature and the gaming world, and show how they can be adapted to DIS. We believe that by presenting these techniques authors can gain a better understanding of how to use existing systems