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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 53 for “"YUCCA"”.
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Rodent Mediated Seed Dispersal of Joshua tree (Yucca brevifolia)
The Joshua tree is a charismatic and popular symbol of the Mojave Desert. Despite its popularity, we know little about the ecology of this species. The seed dispersal of Joshua tree, in particular, has not been thoroughly studied to this point. Here I examine the possible mechanisms acting to …
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Facilitation of Yucca brevifolia recruitment by Mojave Desert shrubs
Yucca brevifolia is distributed throughout a broad range of plant communities. Open substrate dominates the study areas, however a large majority of Y. brevifolia seedlings were found growing under the canopy of other woody shrubs. This pattern of recruitment did not vary by canyon or elevation. …
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Housing location decision under environmental risk: The effects of the Yucca Mountain waste repository
Yucca Mountain is the site of a potential high-level nuclear waste repository in Nevada. The risks to health and safety of transporting and storing nuclear waste at Yucca Mountain may induce the residents of Nevada to move. When offered compensation, residents will weigh potential negative effects …
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Dust control measures for tunnel boring operations at the Yucca Mountain Exploratory Study Facility
Includes bibliographical references (pages 92-96).
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Classification of upland soils by geomorphic and physical properties affecting infiltration at Yucca Mountain, Nevada
Includes bibliographical references.
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Hydrostratigraphic units within the alluvium and tertiary volcanics of East Central Yucca Flat, Nevada Test Site
… log data from 46 boreholes in East Central Yucca Flat, Nevada Test Site, are used to develop lithostratigraphic and hydrostratigraphic columns. Non-zeolitized volcanic lithostratigraphic units geologically correlate to hydrostratigraphic units. Zeolitized volcanic lithostratigraphic units …
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The relationship of the Yucca Mountain repository block to the regional groundwater system: A geochemical model
Yucca Mountain, in southern Nevada, is being studied by the Department of Energy and the State of Nevada as the site of high-level nuclear waste repository. Geochemical and isotopic modeling were used in this thesis to define the relationship of the volcanic tuff aquifers and aquitards to the …
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Post-Closure Silica Transport in the Proposed High Level Radioactive Waste Repository at Yucca Mountain, Nevada
… and from nuclear weapons manufacturing in Yucca Mountain, Nevada. Yucca Mountain, located about 80 miles northwest of Las Vegas, consists of horizontally bedded tuff deposits. Although the region is very arid, enough water exists in the tuffs to create a vapor dominated geothermal system as …
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The Development and Application of Reactive Transport Modeling Techniques to Study Radionuclide Migration at Yucca Mountain, Nevada
Yucca Mountain, Nevada has been chosen as a possible site for the first high level radioactive waste repository in the United States. As part of the site investigation studies, we need to make scientifically rigorous estimations of radionuclide migration in the event of a repository breach. …
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The distribution of vertical groundwater flow in the saturated zone of the Yucca Mountain area: A cross-sectional finite element model
… to explore the saturated groundwater flow at Yucca Mountain in a multi-layer system. Cross-sectional modeling allows the simulation of vertical leakage not included in areal models. The cross section was constructed along an estimated streamline and is 84.3 kilometers long. The conceptual …
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Separation and Structure Characterization of Biologically Important Substances
… to isolate urease inhibitors from commercial Yucca schidigera extract. Trans-3,3$\sp\prime$,5,5$\sp\prime$- tetrahydroxy-4-methoxystilbene was isolated and its structure was assigned. Biological tests indicated that it was a urease inhibitor, and that it was also active against the L1210 …
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Characterization of pozzolanic cement for radioactive waste disposal
… a natural pozzolanic material extracted from Yucca Mountain, Nevada; Portland-pozzolan and lime-pozzolan mixtures were created, analyzed and tested for compressive strength. In addition, the pH of several mixtures was monitored and the values recorded periodically over the first eight days of …
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Thermal considerations in the drift due to the emplacement of a horizontal high level nuclear waste container
The Yucca Mountain Site Characterization Project is investigating the feasibility of locating a high level radioactive nuclear waste repository at Yucca Mountain, Nevada. The design of waste containers to be used for the long term storage of the high level nuclear waste has progressed from the …
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Waste characteristics of spent nuclear fuel from a pebble bed reactor
… characteristics as applied to the conditions of Yucca Mountain is of major concern when determining the cost of disposing of the larger volumes of spent pebble fuel. Graphite is a unique waste form and atypical of waste designated for Yucca Mountain. The interactions of silicon carbide with …
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Avian habitat relationships in the Mojave Desert
… were surveyed, Larrea scrub, Larrea scrub with Yucca and Opuntia, and Coleogyne scrub with Yucca. Bird species richness varied from 1 to 10 species, with the Coleogyne sites having the most species and the Larrea sites having the least. The black-throated sparrow (Amphispiza bilineata) was the …
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Impact assessment using geographic information system (Gis): Transportation engineering applications
… and landuse impact assessment studies; Yucca Mountain, 100 miles northwest of Las Vegas Nevada has been chosen as the site of a proposed repository for high level nuclear waste. This proposed siting has motivated the study of potential transportation related impacts. GIS may be used to …
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Mechanical properties of tuffaceous rocks under triaxial conditions
Yucca Mountain has been designated as a potential site for a high level nuclear waste repository. Part of the site characterization program is an investigation of the mechanical properties of the tuffs which comprise Yucca Mountain. The study tested specimens of TCw tuff in triaxial compression to …
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Impacts of the Little Ice Age on the vegetation of southern Nevada
… Larrea tridentata, Coleogyne ramosissima, and Yucca sp. The study revealed that Coleogyne appeared in the midden at 600 {dollar}\pm{dollar} 50 yr B.P., and full Coleogyne community establishment occurred by 470 {dollar}\pm{dollar} 60 yr B.P. The increase in Coleogyne was coincident with the …
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