Scalarituba missouriensis and its stratigraphic distribution

8 p., 4 pl.http://paleo.ku.edu/contributions.htm

Ordovician, Silurian, and middle Devonian stratigraphy in northwestern Kentucky and southern Indiana: some reinterpretations

Field trip 8 for the Annual Meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992

A Revolution Down on the Farm: The Transformation of American Agriculture since 1929

Agriculture is the most fundamental of all human activities. Today, those who till the soil or tend livestock feed a world population of approximately 6.5 billion. Fifty years ago, the planet could not have sustained such a large population, and according to present projections, farmers will have to feed nine billion people by 2050. The greatest agricultural revolution in history has occurred in the last fifty years , with farmers in the United States leading the way. America’s declining number of farms, however, comes as a surprise to many and may have dramatic implications. Paul K. Conkin’s A Revolution Down on the Farm: The Transformation of American Agriculture since 1929 charts the profound changes in farming that have occurred during his lifetime. Conkin’s personal experience growing up on a small Tennessee farm complements compelling statistical data from the U.S. Department of Agriculture. Using economic and historical analysis, Conkin assesses the skills, new technologies, and government policies that helped transform American farming. He clarifies the present status of a subsidized, large-scale, mechanized, and chemically supported agriculture, evaluates its environmental and human costs, and surveys alternatives to a troubled, widely challenged system. Paul K. Conkin is Distinguished Professor Emeritus of History at Vanderbilt University. He is the author of numerous books, including The State of the Earth, The Southern Agrarians, and When All the Gods Trembled. This important book explores a recent revolution in American history that substituted technology for people and animals in farming and greatly increased output. Paul Conkin tells this tale in his own way, drawing upon his personal involvement in the story as well as the relevant scholarship and the basic documents. --Richard Kirkendall This book is an accurate and straightfoward account of agriculture in America down through the years, spiced with the on-farm experiences of the author himself. All the important farm issues and views about them are discussed in a format that is handy and easy to read. Perfect for the new student of agriculture who needs a quick but detailed introduction to farming history in the United States --Gene Logsdon Conkin’s book certainly springs forward and can be read in a manner that encourages the reader to gain a comprehensive understanding of the topics addressed. What is more, his book is truly interesting to anyone interested in the history of farming or the history of rural America. --North Florida News Daily This book should be recommended reading for students and teachers of agriculture. Furthermore, those working in production agriculture will likely find the book very provocative. --Choice This cogent, thorough history should prove fascinating for anyone interested in the changing landscape of American agriculture. --Publishers Weekly Conkin has combined his skills as a historian with his considerable knowledge and passion for agriculture to write an in-depth account of the revolution in agricultural production that occurred after 1930. This book should be recommended reading for students and teachers of agriculture. Furthermore, those working in production agriculture will likely find the book very provocative. Highly recommended. --Choice As interesting as the personal tale is, however, what is even more useful is Conkin’s concise, carefully written discussion of the major changes in American agriculture since 1929. --Journal of Illinois History Conkin provides an original twist by narrating his own experiences of farm life as a youth in eastern Tennessee…he manages to personalize his tale without letting nostalgia blind his scholarly critical eye. --Journal of American History Historian Paul K. Conkin provides an interesting examination of the transformation that has occurred in American agriculture over the last eighty years. --Kentucky Ancestors This book provokes thought, and ideally it will provoke reflection and a study that addresses the social costs as well as the industrial gains made during the greatest industrial revolution in the history of the United States, the agricultural production revolution. --Ohio Valley History For a generation of students who know little about the agricultural past, Conkin’s book will provide an important and well-rounded overview. --Agricultural History An accurate and straightforward account of agriculture in America down through the years, spiced with the on-farm experiences of the author himself. Perfect for the new student of agriculture who needs a quick but detailed introduction to farming history in the United States. --Gene Logsdon, author of The Mother of all Arts: Agrarianism and the Creative Impulse Conkin cogently describes agricultural life with particular attention to changes wrought by the world beyond farmyard and fields . . . about lost American country life. --Indiana Magazine of History Conkin provides a masterful survey of the major agricultural legislation of the 1930s, noting that the long-term effect of these programs continues to invite curiosity. . . . a friendly, approachable work on agricultural history . . . a map to new ways of thinking about the past and planning for the future. --Arkansas Historical Quarterly Clearly written and organized, Conkin’s book will appeal to anyone interested in farming and the agricultural economy. --Book News Conkin’s latest book—or perhaps, as he predicts, his final book—is a thoughtful and elegantly written survey of American agriculture since the 1930s. --Business History Review -- Sarah Phillips Revolution clarifies an immensely complex topic, not only changes in American agricultural practices and technologies, but also the politics of definition and the long term repercussions of what many might simply ignored as banal. --Southeastern Librarianhttps://uknowledge.uky.edu/upk_history_of_science_technology_and_medicine/1012/thumbnail.jp

Evaluation of US 119 Pine Mountain Safety Improvements: IHSDM Analysis of Post Construction

The spot improvements on US 119 in Letcher County between Whitesburg and Partridge were an attempt to improve safety throughout the corridor. To achieve this goal, the roadway alignment and cross section were changed at various locations. In addition, problems related to truck traffic were considered in redefining the roadway geometries. The total length of the spot improvement locations was approximately 6.9 miles

Predicting waterfowl distribution in the central Canadian arctic using remotely sensed habitat data

Knowledge of a species’ habitat-use patterns, as well as an understanding of the distribution and spatial arrangement of preferred habitat, is essential for developing comprehensive management or conservation plans. This information is absent for many species, especially so for those living or breeding in remote areas. Habitat-use models can assist in delineating specific habitat requirements or preferences of a species. When coupled with geographic information system (GIS) technology, such models are now frequently used to identify important habitats and to better define species’ distributions. Recent and persistent warming, widespread contaminant accumulation, and intensifying land use in the arctic heighten the urgent need for better information about spatial distributions and key habitats for northern wildlife. Here, I used aerial survey and corresponding digital land cover data to investigate breeding-ground distributions and landscape-level habitat associations of greater white-fronted geese (Anser albifrons frontalis), small Canada geese (Branta canadensis hutchinsii), tundra swans (Cygnus columbianus), king eiders (Somateria spectabilis), and long-tailed ducks (Clangula hyemalis) in the Queen Maud Gulf Migratory Bird Sanctuary and the Rasmussen Lowlands, Nunavut, Canada. First, I addressed the sensitivity of inferences about predicting waterfowl presence on the basis of the amounts and configurations of arctic habitat sampled at four scales. Detection and direction of relationships of focal species with land cover covariates often varied when land cover data were analysed at different scales. For instance, patterns of habitat use for a given species at one spatial scale may not necessarily be predicted from patterns arising from measurements taken at other scales. Thus, inference based on species-habitat patterns from some scales may lead to inaccurate depictions of how habitat influences species. Potential variation in species-environment relationships relative to spatial scale needs to be acknowledged by wildlife managers to avoid inappropriate management decisions. Second, I used bird presence determined during aerial surveys and classified satellite imagery to develop species-habitat models for describing breeding-ground distributions and habitat associations of each focal species. Logistic regression models identified lowland land cover types to be particularly important for the species considered. I used the Receiver Operating Characteristic (ROC) technique and the area under the curve (AUC) metric to evaluate the precision of models, where the AUC is equal to the probability that two randomly selected encounter and non-encounter survey segments will be discriminated as such by the model. In the Queen Maud Gulf, AUC values indicated reasonable model discrimination for white-fronted geese, Canada geese, and tundra swans (i.e, AUC > 0.7). Precision of species-habitat models for king eiders and long-tailed ducks was lower than other species considered, but predict encounters and non-encounters significantly better than the null model. For all species, precision of species-habitat models was lower in the Rasmussen Lowlands than in the Queen Maud Gulf, although discrimination ability remained significantly better than the null model for three of five species (king eider and long-tailed duck models performed no better than the null model here). Finally, I simulated anticipated environmental change (i.e., climate warming) in the arctic by applying species-habitat models to manipulated land cover data, and then predicted distributional responses of focal species. All species considered in this research exhibited some association to lowland cover types; white-fronted geese, Canada geese, and tundra swans in particular demonstrated strong affinity toward these habitats. Others authors predict lowland cover types to be most affected by warming. Reductions of wet sedge, hummock, and tussock graminoid cover predicted in this simulation, predominantly along the coast of the Queen Maud Gulf study area and in central areas of the Rasmussen Lowlands, suggest that distributions of species dependant on these lowland habitats will be significantly reduced, if predictions about warming and habitat loss prove to be correct. Research presented here provides evidence that modeling of species’ distributions using landscape-level habitat data is a tractable method to identify habitat associations, to determine key habitats and regions, and to forecast species’ responses to environmental changes

Empirical models for use in designing decompression procedures for space operations

Empirical models for predicting the incidence of Type 1 altitude decompression sickness (DCS) and venous gas emboli (VGE) during space extravehicular activity (EVA), and for use in designing safe denitrogenation decompression procedures are developed. The models are parameterized using DCS and VGE incidence data from NASA and USAF manned altitude chamber decompression tests using 607 male and female subject tests. These models, and procedures for their use, consist of: (1) an exponential relaxation model and procedure for computing tissue nitrogen partial pressure resulting from a specified prebreathing and stepped decompression sequence; (2) a formula for calculating Tissue Ratio (TR), a tissue decompression stress index; (3) linear and Hill equation models for predicting the total incidence of VGE and DCS attendant with a particular TR; (4) graphs of cumulative DCS and VGE incidence (risk) versus EVA exposure time at any specified TR; and (5) two equations for calculating the average delay period for the initial detection of VGE or indication of Type 1 DCS in a group after a specific denitrogenation decompression procedure. Several examples of realistic EVA preparations are provided

Pulmonary artery location during microgravity activity: Potential impact for chest-mounted Doppler during space travel

Doppler, or ultrasonic, monitoring for pain manifestations of decompression sickness (the bends) is accomplished by placing a sensor on the chest over the pulmonary artery and listening for bubbles. Difficulties have arisen because the technician notes that the pulmonary artery seems to move with subject movement in a one-g field and because the sensor output is influenced by only slight degrees of sensor movement. This study used two subjects and mapped the position of the pulmonary artery in one-g, microgravity, and two-g environments using ultrasound. The results showed that the pulmonary artery is fixed in location in microgravity and not affected by subject position change. The optimal position corresponded to where the Doppler signal is best heard with the subject in a supine position in a one-g environment. The impact of this result is that a proposed multiple sensor array on the chest proposed for microgravity use may not be necessary to monitor an astronaut during extravehicular activities. Instead, a single sensor of approximately 1 inch diameter and mounted in the position described above may suffice

The effect of exercise on venous gas emboli and decompression sickness in human subjects at 4.3 psia

The contribution of upper body exercise to altitude decompression sickness while at 4.3 psia after 3.5 or 4.0 hours of 100% oxygen prebreathing at 14.7 psia was determined by comparing the incidence and patterns of venous gas emboli (VGE), and the incidence of Type 1 decompression sickness (DCS) in 43 exercising male subjects and 9 less active male Doppler Technicians (DT's). Each subject exercised for 4 minutes at each of 3 exercise stations while at 4.3 psia. An additional 4 minutes were spent monitoring for VGE by the DT while the subject was supine on an examination cot. In the combined 3.5 and 4.0 hour oxygen prebreathe data, 13 subjects complained of Type 1 DCS compared to 9 complaints from DT's. VGE were detected in 28 subjects compared to 14 detections from DT's. A chi-square analysis of proportions showed no statistically significantly difference in the incidence of Type 1 DCS or VGE between the two groups; however, the average time to detect VGE and to report Tyep 1 DCS symptoms were statistically different. It was concluded that 4 to 6 hours of upper body exercise at metabolic rates simulating EVA metabolic rates hastens the initial detection of VGE and the time to report Type 1 DCS symptoms as compared to DT's

Verification of an altitude decompression sickness prevention protocol for Shuttle operations utilizing a 10.s psi pressure stage

Three test series involving 173-man tess were conducted to define and verify a pre-extravehicular activity (EVA) denitrogenation procedure that would provide acceptable protection against altitude decompression sickness while minimizing the required duration of oxygen (O2) prebreathe in the suit prior to EVA. The tests also addressed the safety, in terms of incidence of decompression sickness, of conducting EVA's on consecutive days rather than on alternate days. The tests were conducted in an altitude chamber, subjects were selected as representative of the astronaut population, and EVA periods were simulated by reducing the chamber pressure to suit pressure while the subjects breathed O2 with masks and worked at EVA representative work rates. A higher than anticipated incidence of both venous bubbles (55%) and symptoms (26%) was measured following all denitrogenation protocols in this test. For the most part, symptoms were very minor and stabilized, diminished, or disappeared in the six-hour tests. Instances of clear, possible, or potential systemic symptoms were encountered only after use of the unmodified 10.2 psi protocol and not after the modified 10.2 psi protocol, the 3.5-hour O2 prebreathed protocol, or the 4.0-hour O2 prebreathe protocol. The high incidence of symptoms is ascribed to the type and duration of exercise and the sensitivity of the reporting technique to minor symptoms. Repeated EVA exposures after only 17 hours did not increase symptom or bubble incidence