Dispersion and uncertainty in multislit matter wave diffraction

We show that single and multislit experiments involving matter waves may be constructed to assess correlations between the position and momentum of a single free particle. These correlations give rise to position dependent phases which develop dynamically and may play an important role in the interference patterns. For large enough transverse coherence lenght such interference patterns are noticeably different from those of a classical dispersion free wave.Comment: 7 pages, 5 figures, revised manuscrip

Relational Analysis of the Phenomenon of Early School Leaving: A Habitus Typology

Although there is an extensive body of literature on the causes and consequences of early school leaving (ESL), little is known of how early school leavers cope with their situation after having left the education system. This paper's main objective is to fill this research gap. At first we look at developments in the social positioning of early school leavers in Austria that show that their situation has deteriorated not only because of changes in the labour market (e.g. due to globalization) but also because of displacement processes that are influenced by habitus formation and capital endowment. Drawing on Bourdieu's concepts of habitus and capital, we explored the situation of young people who had left school early. We used a multi-perspective approach and conducted 123 narrative interviews which we analysed by grouping cases that demonstrated similar social practice and perception patterns generated by a set of socially learned dispositions. Thus we were able to reconstruct a habitus typology consisting of seven different types: the "ambitious", the "status-oriented", the "non-conformist", the "disoriented", the "resigned", the "escapist" and the "caring". How young people experience stigmatization is the common thread that runs through all seven habitus types

Prospects for the measurement of B_s oscillations with the ATLAS detector at LHC

The prospects for the measurement of $B_{s}^{0}$ oscillations with the ATLAS detector at the Large Hadron Collider are presented. $B_{s}^{0}$ candidates in the $D_{s}^{-} \pi^{+}$ and $D_{s}^{-} a_{1}^{+}$ decay modes from semileptonic events were fully simulated and reconstructed, using a detailed detector description. The sensitivity and the expected accuracy for the measurement of the oscillation frequency were derived from unbinned maximum likelihood amplitude fits as functions of the integrated luminosity. A detailed treatment of the systematic uncertainties was performed. The dependence of the measurement sensitivity on various parameters was also evaluated.Comment: Invited talk at the Workshop on the CKM Unitarity Triangle, IPPP Durham, April 2003 (eConf C0304052). 4 pages LaTeX, 2 eps figure

"Interaction-Free" Imaging

Using the complementary wave- and particle-like natures of photons, it is possible to make ``interaction-free'' measurements where the presence of an object can be determined with no photons being absorbed. We investigated several ``interaction-free'' imaging systems, i.e. systems that allow optical imaging of photosensitive objects with less than the classically expected amount of light being absorbed or scattered by the object. With the most promising system, we obtained high-resolution (10 \mu m), one-dimensional profiles of a variety of objects (human hair, glass and metal wires, cloth fibers), by raster scanning each object through the system. We discuss possible applications and the present and future limits for interaction-free imaging.Comment: 10 pages, 6 encapsulated Postscript figure files, accepted for publication in Physical Review

Experimental verification of the Heisenberg uncertainty principle for hot fullerene molecules

The Heisenberg uncertainty principle for material objects is an essential corner stone of quantum mechanics and clearly visualizes the wave nature of matter. Here we report a demonstration of the Heisenberg uncertainty principle for the most massive, complex and hottest single object so far, the fullerene molecule C70 at a temperature of 900 K. We find a good quantitative agreement with the theoretical expectation: dx * dp = h, where dx is the width of the restricting slit, dp is the momentum transfer required to deflect the fullerene to the first interference minimum and h is Planck's quantum of action.Comment: 4 pages, 4 figure

A universal method for automated gene mapping

Small insertions or deletions (InDels) constitute a ubiquituous class of sequence polymorphisms found in eukaryotic genomes. Here, we present an automated high-throughput genotyping method that relies on the detection of fragment-length polymorphisms (FLPs) caused by InDels. The protocol utilizes standard sequencers and genotyping software. We have established genome-wide FLP maps for both Caenorhabditis elegans and Drosophila melanogaster that facilitate genetic mapping with a minimum of manual input and at comparatively low cost

Teacher professionalism in a double field structure

While various forms of teachers' habitus have been described in education studies, little consideration has so far been given to their interaction with fields in schools. This article draws on Bourdieu's theory and related concepts of field, habitus, capital and doxa to explore types of teacher professionalism, especially in Austrian secondary schools where innovative measures and reforms have been introduced. By combining a model of teaching profession with a Bourdieu-based analysis in the interpretation of 70 interviews with secondary school teachers, we show that a double field structure has emerged in some schools, where a field of traditional teaching competes with one of new professional field teaching. We argue that further initiatives will be needed from the field of education policy and other forces in society to stabilise the field of new professional teaching. This article illustrates the dynamic interrelationship between professional habitus and conflicting fields in one particular school