Apocalyptic Discourse in Contemporary Culture: Post-Millennial Perspectives of the End of the World

This interdisciplinary collection of essays focuses on critical and theoretical responses to the apocalypse of the late twentieth- and early twenty-first-century cultural production. Examining the ways in which apocalyptic discourses have had an impact on how we read the world’s globalised space, the traumatic burden of history, and the mutual relationship between language and eschatological belief, fifteen original essays by a group of internationally established and emerging critics reflect on the apocalypse, its past tradition, pervasive present and future legacy. The collection seeks to offer a new reading of the apocalypse, understood as a complex – and, frequently, paradoxical – paradigm of (contemporary) Western culture. The majority of published collections on the subject have been published prior to the year 2000 and, in their majority of cases, locate the apocalypse in the future and envision it as something imminent. This collection offers a post-millennial perspective that perceives "the end" as immanent and, simultaneously, rooted in the past tradition.

Design, analysis and evaluation of sigma-delta based beamformers for medical ultrasound imaging applications

The inherent analogue nature of medical ultrasound signals in conjunction with the abundant merits provided by digital image acquisition, together with the increasing use of relatively simple front-end circuitries, have created considerable demand for single-bit  beamformers in digital ultrasound imaging systems. Furthermore, the increasing need to design lightweight ultrasound systems with low power consumption and low noise, provide ample justification for development and innovation in the use of single-bit  beamformers in ultrasound imaging systems. The overall aim of this research program is to investigate, establish, develop and confirm through a combination of theoretical analysis and detailed simulations, that utilize raw phantom data sets, suitable techniques for the design of simple-to-implement hardware efficient  digital ultrasound beamformers to address the requirements for 3D scanners with large channel counts, as well as portable and lightweight ultrasound scanners for point-of-care applications and intravascular imaging systems. In addition, the stability boundaries of higher-order High-Pass (HP) and Band-Pass (BP) Σ−Δ modulators for single- and dual- sinusoidal inputs are determined using quasi-linear modeling together with the describing-function method, to more accurately model the  modulator quantizer. The theoretical results are shown to be in good agreement with the simulation results for a variety of input amplitudes, bandwidths, and modulator orders. The proposed mathematical models of the quantizer will immensely help speed up the design of higher order HP and BP Σ−Δ modulators to be applicable for digital ultrasound beamformers. Finally, a user friendly design and performance evaluation tool for LP, BP and HP  modulators is developed. This toolbox, which uses various design methodologies and covers an assortment of  modulators topologies, is intended to accelerate the design process and evaluation of  modulators. This design tool is further developed to enable the design, analysis and evaluation of  beamformer structures including the noise analyses of the final B-scan images. Thus, this tool will allow researchers and practitioners to design and verify different reconstruction filters and analyze the results directly on the B-scan ultrasound images thereby saving considerable time and effort.