The Cosmos Revealed Simek, Jan F; Dunsmore, Erin E; Loubser, Johannes ...
2021
eBook
The definitive rock art book on Painted Bluff, Alabama
Boasting more than 130 paintings and engravings, Painted Bluff is perhaps the most elaborate prehistoric pictograph site east of the Mississippi ...River. Positioned at several levels on a dramatic sandstone cliff along the Tennessee River in northern Alabama, the spectacular paintings and engravings depict mythical creatures, dancing humans, and mystical portals. The Cosmos Revealed: Precontact Mississippian Rock Art at Painted Bluff, Alabama is the first complete documentation of one of the most important archaeological sites in eastern North America. Through art, the site materializes a model or “cosmogram” of the Mississippian Native American view of the universe, offering connections between the visible and invisible worlds for Native spiritual leaders and other visitors.
Discovered by Euro-Americans in the early 1800s, the site became known as “Painted Bluff” because of its pictographs, but inexplicably it has only recently been subjected to the intensive archaeological study it deserves. Under the auspices of the Tennessee Valley Authority (TVA), the authors of this volume have documented and assessed the site since 2005, and efforts have been made to reverse some of the vandalism that has occurred over many decades and to stabilize natural degradation of the cliff and its artwork.
Including more than one hundred remarkable prehistoric paintings on the cliff face that have been recorded, mapped, and photographed, this book synthesizes the research done on Painted Bluff to date and documents the entire site. Richly illustrated chapters cover the historical background, geology and archaeology, documentation methods, types of rock art, stratigraphy, paint recipes, TVA management, graffiti removal, and a summary that broadly synthesizes the meaning, timeframe, artistry, organization, conceptual boundaries, and the cosmos revealed. This groundbreaking study features 113 color photographs and a complete catalog of the pictographs and petroglyphs at the site.
Avian influenza (AI) virus can remain infectious in water for months, and virus-contaminated surface water is considered to be a source of infection within wild waterfowl populations. Previous work ...has characterized the effects of pH, salinity, and temperature on viral persistence in water, but most of that work was done with modified distilled water. The objective of this study was to identify the abiotic factors that influence the duration of AI virus persistence in natural surface water. Surface water samples were collected from 38 waterfowl habitats distributed across the United States. Samples were submitted to the U.S. Geological Survey National Water Quality Laboratory for chemical analysis and the University of Georgia for viral reduction time analysis. Samples were filtered with 0.22-μm filters, and the durations of persistence of three wild-bird-derived influenza A viruses within each water sample at 10, 17, and 28°C were determined. The effects of the surface water physicochemical factors on the duration of AI viral persistence in laboratory experiments were evaluated by multivariable linear regression with robust standard errors. The duration of AI virus persistence was determined to be longest in filtered surface water with a low temperature (<17°C), a neutral-to-basic pH (7.0 to 8.5), low salinity (<0.5 ppt), and a low ammonia concentration (<0.5 mg/liter). Our results also highlighted potential strain-related variation in the stability of AI virus in surface water. These results bring us closer to being able to predict the duration of AI virus persistence in surface water of waterfowl habitats.
As part of ongoing work on the Flora of the Southeastern United States (Weakley & Southeastern Flora Team 2023) and related projects, as well as for general floristic, conservation, and scientific ...work in eastern North America, it is essential to document taxonomic and nomenclatural changes and significant distribution records. Here, we propose six new species of graminoids (two Rhynchospora, three Dichanthelium, and one Anatherum)—five from fire-maintained pine savannas and embedded wetlands of the southeastern Coastal Plain and one from the floristically and ecologically related fire-maintained pine savannas of North Andros Island in The Bahamas. We provide rationale and documentation for the “taxonomic resurrection” of Vaccinium ashei, an economically important member of Vaccinium sect. Cyanococcus, based on morphology, estimation of ploidy level with flow cytometry, and phylogenomic analysis based on high-throughput DNA sequencing. We make four new combinations in Convolvulus to accommodate the inclusion of Calystegia in Convolvulus to resolve paraphyly. We also make six new combinations necessary to recognize sect. Leptopogon of Andropogon at generic rank, as Anatherum, based on the phylogenetic work of other researchers and the previously incomplete transfer of recognized species to Anatherum, providing the needed names to recognize this group of species in genus Anatherum in North American floristic treatments. We document the surprising discovery of Carex lutea, previously believed to be endemic to two counties in eastern North Carolina, in two counties in the panhandle of Florida, and a county in eastern South Carolina—discoveries aided by iNaturalist and Facebook. We document new states as being within the distribution ranges of additional species: Quercus similis (Florida), Juncus brachycephalus (Arkansas and Missouri), Rhexia mariana var. mariana (Ohio), Asarum acuminatum and Elionurus tripsacoides (Alabama), and Mecardonia procumbens (Georgia). Other important distributional records, many representing rediscoveries of conservationally significant, extant populations of plants previously considered of only historical occurrence in a state, are also reported: Alabama (Arnica acaulis, Asclepias connivens, Berberis canadensis, Bulbostylis warei, Ctenodon viscidulus, Parnassia grandifolia, and Pinguicula pumila) and Georgia and Florida (Lobelia boykinii).
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Spiders of the family Nesticidae are members of cave communities around the world with cave-obligate (troglobiotic) species known from North America, Europe, Asia and the Indo-Pacific. A radiation of ...Nesticus (Araneae: Nesticidae) in the southern Appalachians includes ten troglobiotic species. Many of these species are of conservation interest due to their small ranges, with four species being single-cave endemics. Despite conservation concerns and their important role as predators in cave communities, we know little about reproduction and feeding in this group. We addressed this knowledge gap by examining populations of two species on a monthly basis for one year. We made further observations on several other species and populations, totaling 671 individual spider observations. This more than doubled the reported observations of reproduction and feeding in troglobiotic Nesticus. Female Nesticus carry egg sacs, facilitating the determination of the timing and frequency of reproduction. We found that Nesticus exhibit reproductive seasonality. Females carried egg sacs from May through October, with a peak in frequency in June. These spiders were rarely observed with prey; only 3.3% (22/671) of individuals were observed with prey items. The frequency at which prey items were observed did not vary by season. Common prey items were flies, beetles and millipedes. Troglobiotic species constituted approximately half of all prey items observed. This result represents a greater proportion of troglobiotic prey than has been reported for various troglophilic spiders. Although our findings shed light on the life history of troglobiotic Nesticus and on their role in cave ecosystems, further work is necessary to support effective conservation planning for many of these rare species.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The probability of proton-induced multiple-bit upset (MBU) has increased in highly-scaled technologies because device dimensions are small relative to particle event track size. Both proton-induced ...single event upset (SEU) and MBU responses have been shown to vary with angle and energy for certain technologies. This work analyzes SEU and MBU in a 130 nm CMOS SRAM in which the single-event response shows a strong dependence on the angle of proton incidence. Current proton testing methods do not account for device orientation relative to the proton beam and, subsequently, error rate prediction assumes no angular dependencies. Proton-induced MBU is expected to increase as integrated circuits continue to scale into the deep sub-micron regime. Consequently, the application of current testing methods will lead to an incorrect prediction of error rates
Device-level current transients are induced by injecting carriers using two-photon absorption from a subbandgap pulsed laser and recorded using wideband transmission and measurement equipment. These ...transients exhibit three distinct temporal trends that depend on laser pulse energy as well as the transverse and vertical charge generation location. The nature of the current transient is controlled by both the behavior of the subcollector-substrate junction and isolation biasing. However, substrate potential modulation, due to deformation of the subcollector-substrate depletion region, is the dominant mechanism affecting transient characteristics.
A new method to directly extract base and emitter resistance parameters for SiGe HBTs using the Mextram bipolar compact transistor model has been presented. The method only requires a standard ...forward Gummel measurement and accounts for several second order effects like high-injection base conductivity modulation, Early effect and emitter current crowding. Base and emitter resistance parameters have been extracted over a wide temperature range (300K - 93K) for a first generation 0.5µm SiGe HBT with a peak cut-off frequency of 50 GHz at 300K. The HBT features a heavily doped poly-silicon emitter, an extrinsic base region doped well above the Mott's transition (3e18 cc for boron in silicon) and an intrinsic base region doped very close to the Mott's transition. The extracted parameters have been verified by comparison with several different methods.
An instrumentation channel is designed, implemented, and tested in a 0.5-μm SiGe BiCMOS process. The circuit features a reconfigurable Wheatstone bridge network that interfaces an assortment of ...external sensors to signal processing circuits. Also, analog sampling is implemented in the channel using a flying capacitor configuration. The analog samples are digitized by a low-power multichannel A/D converter. Measurement results show that the instrumentation channel supports input signals up to 200 Hz and operates across a wide temperature range of -180°C to 125°C. This work demonstrates the use of a commercially available first generation SiGe BiCMOS process in designing circuits suitable for extreme environment applications.
Showcases the wealth of new research on sacred imagery found in 12 states and 4 Canadian provinces. In archaeology, rock-art—any long-lasting marking made on a natural surface—is similar ...to material culture (pottery and tools) because it provides a record of human activity and ideology at that site. Petroglyphs, pictographs, and dendroglyphs (tree carvings) have been discovered and recorded throughout the eastern woodlands of North America on boulders, bluffs, and trees, in caves and in rock shelters. These cultural remnants scattered on the landscape can tell us much about the belief systems of the inhabitants that left them behind. The Rock-Art of Eastern North America brings together 20 papers from recent research at sites in eastern North America, where humidity and the actions of weather, including acid rain, can be very damaging over time. Contributors to this volume range from professional archaeologists and art historians to avocational archaeologists, including a surgeon, a lawyer, two photographers, and an aerospace engineer. They present information, drawings, and photographs of sites ranging from the Seven Sacred Stones in Iowa to the Bald Friar Petroglyphs of Maryland and from the Lincoln Rise Site in Tennessee to the Nisula Site in Quebec. Discussions of the significance of artist gender, the relationship of rock-art to mortuary caves, and the suggestive link to the peopling of the continent are particularly notable contributions. Discussions include the history, ethnography, recording methods, dating, and analysis of the subject sites and integrate these with the known archaeological data.
First collection of the species outside of cultivation in Alabama. First observed in 2005. First collection of the species naturalized in Alabama. First collection of the species naturalized outside ...of cultivation in Alabama.
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