What should and what can a "critical archaeology” offer?

My contribution focuses on the relationship between theory and praxis, since the task of a “critical archaeology” is to mediate between these two spheres. Its target audience is the public, not other scholars. Critical archaeology is not part of scientific practice, but rather is part of intellectual reasoning that is both value-laden and that exercises practical critique. Respect for the specific logics of theory and praxis is crucial for its success. A “critical archaeology” that merits its name must steer its way between the Scylla of a technocratic paternalism that limits praxis and the Charybdis of submission to theory under the presumption of the “relevance of praxis.

Ein Generator zur Entwicklung visueller Sprachen

von Matthias JungPaderborn, Univ., Diss., 200

Economic Welfare Of Firefighting Service In Detroit

Chapter 1 is concerned with the effect of public fire service quality on individual utility. I develop a theoretical model to account for fire risk as a function of socio-economic, housing, and spatial factors. I review relevant literature on certain inherent public fire service issues regarding technology and cost structure before I briefly discuss the importance of public fire service with regard to overall social welfare. Finally, I employ equity mapping in a case study to assess the effect of a budget cut on equity of fire service allocation in Detroit. Chapter 2 examines whether socio-economic factors, various aspects of housing, and spatial features can explain differences in building fire risk across Detroit. Using a complete Detroit fire incidents data set for the years 2008-2012, matched by census tract to American Community Survey (ACS) data for the same period, I employ kernel density mapping and spatial regression techniques to address the research question. Estimations suggest a positive correlation between poverty and fire risk, especially with regard to intentional building fires. In the case of unintentional building fires, no such conclusion can be drawn easily. I find evidence for fire clustering and spillover effects. Chapter 3 approaches the question of optimal fire station siting in Detroit from a welfare economics viewpoint. Therefore, I assess the effects of a decrease in public budget in 2012 on distributional equity. First, regression analysis is used to determine the effect on response time as an indicator of fire service quality. Second, I use various statistical measures to evaluate intra-city service distribution with respect to equality. Third, I develop a fire risk index and link it to service quality to determine need satisfaction. I find ambiguous effects on distributional equality, while there is strong evidence of the change in budget having a negative effect on equity interpreted as need

Plastic response by dislocation glide in solid helium under dc strain rate loading

We develop a model for the gliding of dislocations and plasticity in solid He-4. This model takes into account the Peierls barrier, multiplication and interaction of dislocations, as well as classical thermally and mechanically activated processes leading to dislocation glide. We specifically examine the dc stress-strain curve and how it is affected by temperature, strain rate, and dislocation density. As a function of temperature and shear strain, we observe plastic deformation and discuss how this may be related to the experimental observation of elastic anomalies in solid hcp He-4 that have been discussed in connection with the possibility of supersolidity or giant plasticity. Our theory gives several predictions for the dc stress strain curves, for example, the yield point and the change in the work-hardening rate and plastic dissipation peak, that can be compared directly to constant strain rate experiments and thus provide bounds on model parameters.Comment: 10 pages, 8 figures; minor revisions of accepted versio

Dislocation induced anomalous softening of solid helium

The classical motion of gliding dislocation lines in slip planes of crystalline solid helium leads to plastic deformation even at temperatures far below the Debye temperature and can affect elastic properties. In this work we argue that the gliding of dislocations and plasticity may be the origin of many observed elastic anomalies in solid He-4, which have been argued to be connected to supersolidity. We present a dislocation motion model that describes the stress-strain $\tau$-$\epsilon$ curves and work hardening rate $d\tau/d\epsilon$ of a shear experiment performed at constant strain rate $\dot{\epsilon}$ in solid helium. The calculated $d\tau/d\epsilon$ exhibits strong softening with increasing temperature due to the motion of dislocations, which mimics anomalous softening of the elastic shear modulus $\mu$. In the same temperature region the motion of dislocations causes dissipation with a prominent peak.Comment: 15 double-spaced pages, 4 figures; revised model parameters to account for low experimental yield stress, otherwise unchange

Efficient Phantom Source Widening and Diffuseness in Ambisonics

Object-based spatial audio considers virtual sound sources having a width/diffuseness parameter. This parameter aims at controlling the perceived width or diffuseness of the auditory object, or phantom source, created by the renderer. Width/diffuseness provides an important salience parameter that is independent of perceived direction and timbre. A highly efficient sparse filter structure for two-channel stereophony was described and tested recently, but it becomes ineffective for most parts of a large audience. This paper presents phantom source width/diffuseness control for Ambisonics. The new approach is a remarkably elegant application of the previously described stereo phantom source widening on Ambisonics. Compared with former experimental data, our experiments show a greater freedom of increasing the width and widening that works for a larger listening area