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Angela Davis lecture recording and poster
Get PDFDavis, a professor of history of consciousness and feminist studies at the University of California Santa Cruz, is the author of eight books, including her most recent publications Abolition Democracy and Are Prisons Obsolete? She is now completing a book on Prisons and American History. Like many other educators, Professor Davis is especially concerned with the general tendency to devote more resources and attention to the prison system than to educational institutions. Having helped to popularize the notion of a “prison industrial complex,” she now urges her audiences to think seriously about the future possibility of a world without prisons and to help forge a 21st century abolitionist movement. Her talk was followed by a question-and-answer session, reception and book signing
Self-alignment of silicon chips on wafers: a capillary approach
Get PDFAs the limits of Moores law are approached, three-dimensional integration appears as the key to advanced microelectronic systems. Die-to-wafer assembly appears to be an unavoidable step to reach full integration. While robotic methods experience difficulties to accommodate fabrication speed and alignment accuracy, self-assembly methods are promising due to their parallel aspect, which overcomes the main difficulties of current techniques. The aim of this work is the understanding of the mechanisms of self-alignment with an evaporating droplet technique. Stable and unstable modes are examined. Causes for misalignments of chips on wafers and their evolution are investigated with the help of the SURFACE EVOLVER numerical software. Precautions for suitable alignment are proposed
Silicon Die Self-alignment on a Wafer: Stable and Unstable Modes
Get PDF3D integration is the key to advanced microelectronic systems. Die-to-wafer assembly is a necessary step to reach full integration. Self-assembly methods are promising due to their parallel aspect which overcomes the main difficulties of the current techniques. The aim of this work is the understanding of the mechanisms of self-alignment with an evaporating droplet technique and the investigation the stable and unstable modes. Using the Surface Evolver software, we analyze the causes for misalignments of the system and their evolution
Cognitive effects of hypercapnia on immersed working divers
Get PDFCognitive effects of inspired doses of CO2 during submerged working dives have previously not been explored. Three experiments using male volunteer Navy divers in the NEDU test pool under 12 feet of fresh water explored: (1) dose-related and on/off effects of 1.5% (Phase 1a, N=20) and 3% (Phase 1b, N=16) inspired CO2; (2) questions of whether switching to gas free of CO2 results in further changes in performance or restoration to baseline (Phase 2, N=34); and (3) differences in the effects of CO2 in air vice in O2 (Phase 3, N=16). End tidal CO2 was collected from all divers and correlated with cognitive performance. The Automated Neuropsychological Assessment Metrics, version 4 (ANAM4), was used before and four times during each dive — with three intermittent periods of mild or moderate exercise during each dive — to measure nine cognitive domains. No dose-related effect of CO2 was found. Basic cognitive domains of simple reaction time, visual scanning, visuo-spatial processing, and learning were unaffected, while fatigue and the higher cognitive functions of short-term memory (STM), long-term memory (LTM), working memory (WM), math processing, and sustained attention produced perplexing results. Most consistent of all differences was the decrease in LTM while divers were on CO2, a decrease that persisted in Phase 1 even after divers were removed from CO2 and returned to O2. Math processing, WM, and sustained attention increased among divers both during and after breathing CO2. STM decreased on CO2 in Phase 1 but not in Phase 2. No cognitive changes were detected on air, when end tidal CO2 remained closer to normal than on O2. While some participants reported mild to moderate symptoms (e.g., headache, shortness of breath, irritability, and lack of concentration), end tidal CO2 levels were mostly \u3c7% Surface Equivalent Value (SEV). Because subjects were not hypercapnic, we cannot address the question of the study. Further investigation of the effects of inspired CO2 on higher cognitive domains — along with consideration of breathing resistance — is recommended
