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The Frozen Saqqaq Sites of Disko Bay, West Greenland - Qeqertasussuk and Qajaa (2400-900 BC)
Qeqertasussuk and Qajaa are the only known sites of the Early Arctic Small Tool tradition in the Eastern Arctic, where all kinds of organic materials - wood, bone, baleen, hair, skin - are preserved in permafrozen culture layers. Together, the sites cover the entire Saqqaq era in Greenland (c. 2400-900 BC). Technological and contextual analyses of the excellently preserved archaeological materials from the frozen layers form the core of this publication. Bjarne Grønnow draws a new picture of a true Arctic pioneer society with a remarkably complex technology. The Saqqaq hunting tool kit, consisting of bows, darts, lances, harpoons, and throwing boards as well as kayak-like sea-going vessels, is described for the first time. A wide variety of hand tools and household utensils as well as lithic and organic refuse and animal bones were found on the intact floor of a midpassage dwelling at Qeqertasussuk. These materials provide entirely new information on the daily life and subsistence of the earliest hunting groups in Greenland. Comparative studies put the Saqqaq Culture into a broad cultural-historical perspective as one of the pioneer societies of the Eastern Arctic.
Virtual Space
Containing the edited research papers resulting from an ambitious, cross-disciplinary research project, this volume examines the spatiality of virtual inhabited 3D worlds - virtual reality and cyberspace. (Three other volumes look at Interaction, Staging and Methodology.) It is about the communication spaces emerging at the Internet and supported by special 3D interfaces. It is also about the virtual spaces created by virtual reality hardware (CAVEs, panoramic screens, head mounted display systems etc.) and software. Virtual Space: Spatiality in Virtual Inhabited 3D Worlds is interdisciplinary. It deals with philosophical, psychological, communicational, technological and aesthetic aspects of space. While philosophy raises the question concerning the ontology of space - what is space - psychology deals with our perception of space. Communication theory looks at the way in which space supports communication (i.e. that space is a medium for communication), and finally aesthetic analyses exemplify the use of virtual space in virtual cities, in museums and in art.
Archiv for Pharmacie
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Continuous-Time Delta-Sigma Modulators for High-Speed A/D Conversion
Among analog-to-digital converters, the delta-sigma modulator has cornered the market on high to very high resolution converters at moderate speeds, with typical applications such as digital audio and instrumentation. Interest has recently increased in delta-sigma circuits built with a continuous-time loop filter rather than the more common switched-capacitor approach. Continuous-time delta-sigma modulators offer less noisy virtual ground nodes at the input, inherent protection against signal aliasing, and the potential to use a physical rather than an electrical integrator in the first stage for novel applications like accelerometers and magnetic flux sensors. More significantly, they relax...
