The Snake River Plain is located in the southern part of the state of Idaho. The eastern plain, on which this study focuses, is a trail of volcanics from the Yellowstone hotspot. Three exploratory geothermal wells were drilled on the Snake River Plain. This project analyzes basaltic core from the first well at Kimama, north of Burley, Idaho. The objectives of this project are to establish zones of geothermal alteration and analyze the potential for geothermal power production using sub-aquifer resources on the axial volcanic zone of the Snake River Plain. Thirty samples from 1,912 m of core were sampled and analyzed for clay content and composition using X-ray diffraction. Observations from core samples and geophysical logs are also used to establish alteration zones. Mineralogical data, geophysical log data and physical characteristics of the core suggest that the base of the Snake River Plain aquifer at the axial zone is located 960m below the surface, much deeper than previously suspected. Swelling smectite clay clogs pore spaces and reduces porosity and permeability to create a natural base to the aquifer. Increased temperatures favor the formation of smectite clay and other secondary minerals to the bottom of the hole. Below 960 m the core shows signs of alteration including color change, formation of clay, and filling of other secondary minerals in vesicles and fractured zones of the core. The smectite clay observed is Fe-rich clay that is authigenic in some places. Geothermal power generation may be feasible using a low temperature hot water geothermal system if thermal fluids can be attained near the bottom of the Kimama well. (113 pages)

The role of bison in the prehistoric subsistence in southern Idaho is not fully understood. Bison remains from Baker Cave, a late Holocene archaeological site dating to cal A.D. 1042-1265, however, provide evidence of pre-contact subsistence strategies in the region. This thesis focuses on the paleoecology of bison and their role in prehistoric subsistence on the Snake River Plain (SRP). The ecological study of bison focuses on the hypothesized trans-Holocene diminution in bison body size in southern Idaho, while a second study focuses on how these animals figured into prehistoric responses to seasonal fat scarcity. Although bison diminution and its ecological determinants are well understood on the Great Plains, the history of diminution west of the Rocky Mountains is less clear. Bison morphometrics from Baker Cave present the opportunity to assess bison diminution on the Snake River Plain. Bison morphometrics from Baker Cave are indistinguishable not only from other late Holocene bison on the Snake River Plain but iv also from late Holocene bison from the Great Plains. Further, the Baker Cave bison are smaller than early Holocene bison from the Great Plains and Snake River Plain. These results suggest morphological similarity between Snake River Plain bison and Great Plains bison through the Holocene, pointing to similar bottom up ecological constraints on body size. Although bison are common components of SRP archaeofaunas, their role in prehistoric subsistence is poorly understood. To shed light on this problem, I hypothesize that the Baker Cave bison assemblage resulted from hunters seeking skeletal fat. I test predictions drawn from this hypothesis with assemblage-level patterns in element representation, impact scar distribution, and fragmentation. These assemblage-level patterns track the skeletal fat utility of elements. These patterns, combined with winter procurement evidenced by fetal remains, support the hypothesis that fat-seeking behavior was a response to winter fat scarcity. A comparison with smaller bison assemblages from southern Idaho suggests that this fat-seeking behavior might have persisted as far back as the middle Holocene, although this requires confirmation from future studies.

Relationships between nutrient heterogeneity, root foraging behavior and short-term competitive interactions were investigated for six species native to southeastern USA. Monoculture, two- and six-species garden plots were established and fertilized to create spatially homogeneous or heterogeneous nutrient conditions. After 3.5 months, root proliferation in rich patches (precision) and aboveground biomass response to heterogeneity were assessed in monocultures, and competitive outcomes (aboveground biomass) were determined from mixed-species plots. In monoculture plots, two species were relatively precise foragers, but no species showed significant aboveground biomass response to nutrient treatment. Correlations between precision and aboveground biomass were weak (-0.40 < r < 0.17). In two-species plots, interspecific competition was influenced by soil heterogeneity in two of six cases tested (P < 0.05), and precision was the behavior most correlated with competitive success. In six-species plots, spatial pattern of nutrients had no influence on aboveground growth or competition. Results suggest that heterogeneity influences competition, but the influence is context-specific and generally small. Precision may be the foraging behavior that most influences interspecific interactions. / Ph. D.

Some alarming trends in commercial forest acreage and pine growing stocks have been developing over the course of four Forest Surveys in eastern Virginia; Forest Survey Unit 1. The importance of the timber resource to the region's economy has brought about a need for research into the long-run timber prospects. Long-run timber output potentials in eastern Virginia are primarily dependent upon two factors: Prospective changes in commercial forest acreage and the intensity with which the forest acreage is managed. An analysis of past trends and a study of the opinions of knowledgeable persons in eastern Virginia lead to the estimate that commercial forest acreage will dec~ease approximately 9 percent by 2020. As for timber management intensity, the study commences with data on cubic-foot yields for the five major forest types, as related to stand age and stocking. From these data, potential yield, per acre and total, is estimated for each class of forest owner. The study finds that in eastern Virginia, nonindustrial private owners are managing their timber much more intensively than generally supposed. In fact, their timber output per acre is on a par with that of public and forest industry owners. If pine timber output is to be increased in the long run, apparently conversion of hardwood stands to pine, not more intensive management of existing stands, will be the means. / Master of Science

Understanding irrigator responses to previous changes in water availability is critical to building effective institutions that allow for efficient and resilient management of water resources in the face of potentially increasing scarcity due to climate change. Using remote sensing data, I examined irrigator responses to seasonal changes in water availability in Idaho's Snake River Plain over the past 33 years. Google Earth Engine's high performance cloud computing and big data processing capabilities were used to compare the performance of three spectral indices, three compositing algorithms and two sensors for 2002 and 2007 for distinguishing between irrigated and non-irrigated parcels. We demonstrate that, on average, the seasonal-maximum algorithm yields a 60% reduction in county scale root mean square error (RMSE) over the accepted single-date approach. We use the best performing classification method, a binary threshold of the seasonal maximum of the Normalized Difference Moisture Index (NDMI), to identify irrigated and non-irrigated lands in Idaho's Snake River Basin for 1984-2016 using Landsat 5-8 data. NDMI of irrigated lands was found to generally increase over time, likely as a result of changes in agricultural practices increasing crop productivity. Furthermore, we find that irrigators with rights to small areas, and those with only surface water rights are more likely to have a major reduction (>25%) in irrigated area and conversely those with a large, groundwater rights are more likely to have major increases (>25%) in the extent of their irrigation. / Master of Science / Understanding irrigator responses to previous changes in water availability is critical to building effective institutions that allow for efficient and resilient management of water resources in the face of potentially increasing scarcity due to climate change. Using remote sensing data, I examined irrigator responses to seasonal changes in water availability in Idaho’s Snake River Plain over the past 33 years. Google Earth Engine’s high performance cloud computing and big data processing capabilities were used to compare the performance of three spectral indices, three compositing algorithms and two sensors for 2002 and 2007 for distinguishing between irrigated and non-irrigated parcels. We demonstrate that, on average, the seasonal-maximum algorithm yields a 60% reduction in county scale root mean square error (RMSE) over the accepted single-date approach. We use the best performing classification method, a binary threshold of the seasonal maximum of the Normalized Difference Moisture Index (NDMI), to identify irrigated and non-irrigated lands in Idaho’s Snake River Basin for 1984-2016 using Landsat 5-8 data. NDMI of irrigated lands was found to generally increase over time, likely as a result of changes in agricultural practices increasing crop productivity. Furthermore, we find that irrigators with rights to small areas, and those with only surface water rights are more likely to have a major reduction (>25%) in irrigated area and conversely those with a large, groundwater rights are more likely to have major increases (>25%) in the extent of their irrigation.

No / The aim is to determine the effect of reference standard related bias on estimates of plain radiograph reading performance using studies conducted in clinical practice. Data were extracted on study eligibility, clinical and reference standard characteristics and reading performance. The choice of reference standards and the prevalence of bias are presented descriptively. Associations between bias and reading performance are estimated using a regression model that produces relative diagnostic odds ratios (RDOR) with 95% confidence intervals (CIs). Three of the 20 eligible studies addressed all five reference standard related biases; 15 studies addressed three or more. When the reference standard report is influenced by knowledge of an observer's opinion this is associated with a significant overestimation in reading performance (RDOR, 3.7; 95% CI, 1.6 to 8.3; p¿=¿0.01). There is limited evidence that reading performance is inflated when the observer is aware of the reference standard report before commenting on the radiograph (RDOR, 1.7; 95% CI, 0.6 to 5.1) and deflated when a less valid reference standard is used (RDOR, 0.5; 95% CI, 0.1 to 2.5). There is no evidence that reading performance is affected by application of the reference standard depending on an observer's opinion and using different reference standards in the same study. In conclusion we found variation in the choice and application of reference standards in studies of plain radiograph reading performance, but only when reference standards report in the knowledge of an observer's opinion does this contribute to a significant overestimation in reading performance.

No / To determine the accuracy of radiographer plain radiograph reporting in clinical practice. MATERIALS AND METHODS Studies were identified from electronic sources and by hand searching journals, personal communication and checking reference lists. Eligible studies assessed radiographers' plain radiograph reporting in clinical practice compared with a reference standard, and provided accuracy data to construct 2×2 contingency tables. Data were extracted on study eligibility and characteristics, quality and accuracy. Summary estimates of sensitivity and specificity and receiver operating characteristic curves were used to pool the accuracy data. RESULTS Radiographers compared with a reference standard, report plain radiographs in clinical practice at 92.6% (95% CI: 92.0¿93.2) and 97.7% (95% CI: 97.5¿97.9) sensitivity and specificity, respectively. Studies that compared selectively trained radiographers and radiologists of varying seniority against a reference standard showed no evidence of a difference between radiographer and radiologist reporting accuracy of accident and emergency plain radiographs. Selectively trained radiographers were also found to report such radiographs as accurately as those not solely from accident and emergency, although some variation in reporting accuracy was found for different body areas. Training radiographers improved their accuracy when reporting normal radiographs. CONCLUSION This study systematically synthesizes the literature to provide an evidence-base showing that radiographers can accurately report plain radiographs in clinical practice.

Yes / To update knowledge on individual radiographer contribution to plain-film reporting workloads; to assess whether there is scope to further increase radiographer reporting capacity within this area. Methods: Reporting radiographers were invited to complete an online survey. Invitations were posted to every acute National Health Service trust in the UK whilst snowball sampling was employed via a network of colleagues, ex-colleagues and acquaintances. Information was sought regarding the demographics, geographical location and anatomical and referral scope of practice. Results: A total of 259 responses were received. 15.1% and 7.7% of respondents are qualified to report chest and abdomen radiographs, respectively. The mean time spent reporting per week is 14.5 h (range 1–37.5). 23.6% of radiographers report only referrals from emergency departments whilst 50.6% of radiographers have limitations on their practice. Conclusion: The scope of practice of reporting radiographers has increased since previous studies; however, radiographer reporting of chest and abdomen radiographs has failed to progress in line with demand. There remain opportunities to increase radiographer capacity to assist the management of reporting backlogs. Advances in knowledge: This study is the first to examine demographic factors of reporting radiographers across the UK and is one of the largest in-depth studies of UK reporting radiographers, at individual level, to date.

Thesis (MSc (Geography and Environmental Studies))--University of Stellenbosch, 2007. / The Agulhas Plain, an area rich in fynbos, was monitored within six months after the February 2006 fire. The potential of using medium resolution imagery, specifically from the Moderate Resolution Imaging Spectroradiometer (MODIS) in determining the re-growth rates of indigenous and alien vegetation types after fire was explored. Pixels representing dense areas of each vegetation type were selected. There was a significant difference in the pixels selected for each vegetation type. A time series of Normalized Difference Vegetation Index (NDVI) data was derived and fitted to functions, such as Double Logistics and Asymmetric Gaussian as implemented in the TIMESAT software. The results show that alien vegetation grows faster after a fire occurrence than in its absence. Within the specified months of monitoring, it was observed that fynbos grew faster than the alien vegetation. Also, the re-growth rates of vegetation on the coastal soils were higher than those of vegetation on the inland soils. The determination of the re-growth rate was necessary to assist resource managers determine the appropriate time for follow-up of clearing invaded sites after fire.

Thesis (Mnutr)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: Introduction Adequate fruit and vegetable consumption can provide many health and nutrition benefits, and can contribute to nutritional adequacy and quality of the diet. Despite existing strategies, most people in South Africa do not consume the recommended intake of five fruits and vegetables per day, and micronutrient intakes remain low. Aim The aim of this study was to describe underlying factors that influence individual and household fruit and vegetable consumption, in an area of the Mitchells Plain sub-district, by engaging with community members in a participatory manner in accordance with a human rights-based approach. Methodology This study was cross-sectional and descriptive. Data collection was conducted from November 2012 until January 2013, in an area of Mitchells Plain. Focus group discussions were conducted to gain a broad understanding of factors that influence fruit and vegetable consumption in the community and to identify individuals for individual interviews. In-depth interviews were conducted with strategically selected community members considered to be influential in food preparation, distribution or consumption, in order to gain in-depth understanding of specific factors associated with fruit and vegetable consumption. Results Four focus group discussions were conducted with 40 participants in total, allocated to three different groups (18 to 29 year old females, 30 to 70 year old females, 18 to 60 year old males). Fifteen in-depth interviews were conducted with community leaders, individuals involved in food production (kitchen managers) or sale thereof (an informal vendor and a tuck shop owner), individuals involved in health education (a professional nurse) and basic education (a grade one educator), and others. Dominant themes discussed included fruit and vegetable consumption patterns (religious, cultural and traditional dishes, seasonal variation), fruit and vegetable preparation techniques and commonly prepared dishes, fruit and vegetable access (purchasing, vegetable gardens and direct provision) and changes in fruit and vegetable consumption patterns. Barriers to fruit and vegetable consumption included that although most participants considered them to be important, fruit and vegetables were not considered a priority food item (inadequate time and effort is allocated to food purchasing and preparation), negative side-effects of consumption, fruit and vegetables are perishable and benefits of fruit and vegetable consumption are not immediately apparent. Facilitators of fruit and vegetable consumption were personal preference, traditional dishes prepared that include fruit or vegetable ingredients, individuals who sell or grow fruit and vegetables having increased availability, use of convenience fruit and vegetable items, and modelling and discipline in children. Suggestions to improve consumption included education using practical advice such as fruit recipes to improve the appeal of fruit and vegetable dishes, and methods to decrease preparation time and cost. Conclusions Limited fruit and vegetable consumption is not simply determined by limited nutrition knowledge or poor decision-making by households, but rather by a much wider set of social, economic and spatial processes. Creative and innovative behaviour-changing strategies are required that target individuals but also take cognisance of wider structural barriers, and work to create an enabling environment that is supportive of healthy eating and an adequate consumption of fruit and vegetables. / AFRIKAANSE OPSOMMING: Inleiding Voldoende inname van vrugte en groente hou baie gesondheids- en voedingsvoordele in, en kan bydra tot voedingstoereikenheid en kwaliteit van die dieet. Ongeag bestaande strategieë, neem die meeste mense in Suid-Afrika nie die aanbevole vyf vrugte en groente in nie, en mikronutriënt inname bly laag. Doelwit Die doel van hierdie studie was om die onderliggende faktore wat indiwiduele en huishoudelike vrugte- en groenteverbruik in 'n area van die Mitchells Plein subdistrik beïnvloed, te beskryf, deur met lede van die gemeenskap in 'n deelnemende manier betrokke te raak in ooreenstemming met 'n menseregte-gebaseerde benadering. Metodes Hierdie deursnee studie was beskrywend. Data-insameling het vanaf November 2012 tot Januarie 2013 in 'n gedeelte van Mitchells Plein plaasgevind. Fokusgroepbesprekings is gehou om 'n breër begrip van die faktore wat vrugte- en groenteverbruik in die gemeenskap beïnvloed, te bekom en om indiwidue te identifiseer vir indiwiduele onderhoude. In-diepte onderhoude is gevoer met strategies verkose gemeenskapslede wat beskou word as invloedryk in voedselvoorbereiding, verspreiding en verbruik, om 'n dieper begrip van spesifieke faktore wat met vrugte- en groenteverbruik verband hou, te bekom. Resultate Vier fokusgroep-besprekings is gehou met 'n totaal van 40 deelnemers, versprei oor drie verskillende groepe (18 - 29 jarige vroue, 30 - 70 jarige vroue, 18 - 60 jarige mans). Vyftien in-diepte onderhoude is gevoer met gemeenskapsleiers (polities en godsdienstig), indiwidue betrokke by voedselverwerking (kombuisbestuurders) of verkope (informele verkoper en snoepwinkeleienaar), indiwidue betrokke by gesondheidsopvoeding (professionele verpleegster) en basiese onderrig (graad een opvoeder) en andere. Oorheersende temas sluit in vrugte- en groenteverbruikspatrone (godsdienstige, kulturele en tradisionele disse, seisonale wisseling in gebruik), vrugte en groente voorbereidingstegnieke en alledaagse disse, toegang tot vrugte en groente (aankoop, groentetuine en direkte voorsiening) en verandering in vrugte- en groenteverbruikspatrone. Hindernisse tot vrugte- en groenteverbruik sluit in dat hoewel die meeste deelnemers vrugte- en groenteverbruik belangrik ag, word vrugte en groente nie as 'n prioriteitsvoedsel gesien nie. Voldoende tyd en aandag word nie aan voedsel-aankope en -voorbereiding afgestaan nie, daar is negatiewe newe-effekte aan verbruik, vrugte en groente is bederfbaar en die voordele van vrugte en groenteverbruik is nie duidelik waarneembaar nie.Persoonlike voorkeur is bevorderlik vir vrugte- en groenteverbruik, sommige tradisionele disse word met vrugte of groente bestanddele voorberei, asook die groter beskikbaarheid van indiwidue wat vrugte en groente verkoop of kweek, die gebruik van vrugte en groente gemaksitems, en die gedragsmodellering en dissiplinering van kinders. Voorstelle om verbruik te verbeter het ingesluit opvoeding met praktiese raad soos vrugte en groente resepte om die aantreklikheid van vrugte en groente disse te verhoog en metodes om voorbereidingstyd en onkoste te verminder. Gevolgtrekking Beperkte vrugte en groente verbruik word nie net bepaal deur beperkte voeding kennis of swak besluitneming deur huishoudings nie, maar deur 'n veel wyer reeks van maatskaplike, ekonomiese en ruimtelike prosesse. Skeppende en innoverende gedragsveranderende-strategieë wat gemik is op indiwidue is nodig, asook aandag aan wyer strukturele hindernisser. Sodoende kan ‘n bemagtigende omgewing geskep word om gesonde eetgewoontes en die verbruik van voldoende vrugte en groente te ondersteun.