Global ETD Search
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 34 for “"Site Effects"”.
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On-site effects of accelerated erosion on direct-physical soil quality indicators
… and inexpensive protocol of estimating the effects of accelerated erosion on the soil quality. An assessment was undertaken in sites showing threat of accelerated erosion using various direct physical soil quality indicators. Four sites with different soil types were identified at initial …
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Site effects on wildlife enteric bacterial diversity: you are where you eat?
… among host species can produce distinct local effects in community richness and composition, especially when host species have amplified opportunities for microbial exchange such as higher population densities or limited habitat area. Next in Chapter 3, we explored taxonomically finer-scale …
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Estimation of Non-Linear Seismic Site Effects for Deep Deposits of the Mississippi Embayment
… seismic hazard analysis with non-linear site effect performed in the ME to develop site coefficients. Current site coefficients, proposed in National Earthquake Hazard Reduction Program (NEHRP), are used with USGS hazard maps to develop site specific recommended response spectrum. The …
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The Imipramine Binding Site: Effects of Aging, Ovarian Hormones, Adrenal Hormones, and Chronic Antidepressant Treatment
Binding sites for the antidepressant imipramine have been described in the brain and blood platelets of several species of animals, including rats and humans. Decreased levels of imipramine binding sites are found in depressed patients when compared to controls.
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The separation of source, path and site effects on high frequency seismic waves : an analysis using coda wave techniques
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1985.
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Quantification of Uncertainties for Conducting Partially Non-ergodic Probabilistic Seismic Hazard Analysis
Estimating local site effects and modifying the uncertainty in ground motion predictions are two indispensable parts of partially non-ergodic site-specific PSHA. Local site effects can be estimated using site response simulations or recorded ground motions at the site. When such predictions are …
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Development of techniques for earthquake microzonation studies in different urban environment
… hazard assessment, the evaluation of local site effects and their influence on the spatial distribution of ground shaking generated by an earthquake plays an important role. It follows that the carrying out of earthquake microzonation studies, which aim at identify areas within the urban …
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Seismic hazard assessment in Central Asia
… is estimated considering ground motion at rock site, but since the ground motion could vary significantly over short distances due to local surficial geology, it is important to consider locally estimated site effects in seismic hazard assessment. Under the GSHAP project carried out in …
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Seismic Site Response and Extraction of Dynamic Soil Behavior From Downhole Array Measurements
… seismic hazard analysis with nonlinear site effects, can be used to estimate seismic hazard with the effect of deep deposits. This thesis extends the PSHA-NL procedure to incorporate a finite fault model in PSHA without applying artificial caps on computed ground motions, and include …
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Conventional and deep learning-based site amplification models for central and eastern North America
… continental region that lacks region-specific site amplification functions due to a dearth of ground motion recordings for empirical constraints. Recently developed site amplification functions using a parametric study of large-scale one-dimensional (1D) site response analyses represent …
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Biomonitoring an Impacted Stream Using Benthic Macroinvertebrates and Bioassays
… level appears to have been sufficient to detect site effects. Not all of the metrics used in this study were equally valuable; the EPT index and HBI showed the highest sensitivity to site differences, and the HBI was the most precise. Results of bioassays were not always concordant with results …
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Characterizing microearthquakes and shallow structure with dense array and optical fibers
… of trade-offs with other wave propagation effects. The trade-offs with attenuation can cause the apparent stress drop to vary, resulting in an apparent breakdown of earthquake self-similarity. To date, researchers are still trying to understand the uncertainty in source parameter …
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Microtremor recordings in Northern Mississippi: Evaluating site effect and correlating with wave climate
Site effects is considered as one of the main reasons that cause enormous damages in earthquakes and it is mainly controlled by the local geological condition. The main research area, Northern Mississippi, is located in Mississippi Embayment (ME) where is mainly composed of unconsolidated sediments …
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Empirical nonlinear site response applicable to Greater Vancouver, British Columbia
… motion recordings that have similar linear site response to Greater Vancouver to constrain the expected nonlinear soil response for future large earthquakes affecting Greater Vancouver. The empirical results confirm that the very low fundamental frequency (f0 < 0.6 Hz) at deep Fraser River …
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Impacts of timber harvesting on soil physical properties in wetlands
Six wet pine flat sites were salvage logged following Hurricane Hugo in the fall of 1989. High soil moisture conditions during salvage operations resulted in soil compaction and deep rutting (puddling) on primary skid trails. Two studies were established to assess the effects of trafficking on soil …
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Seismic site characterization using broadband and DAS ambient vibration measurements on Mt Etna, Italy
… to be valuable tools to gain insight into local site effects by ambient noise measurements. Here, the two methods are employed to assess the subsurface velocity structure at the Piano delle Concazze area on Mt Etna. Volcanic tremor records from an array of 26 broadband seismometers is processed …
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A comparison of proxies for seismic site conditions and amplification for the large urban area of Santiago de Chile
… and a study was carried out aiming to estimate site amplification derived from earthquake data and ambient noise. The analysis of earthquake data shows significant dependence on the local geological structure with regards to amplitude and duration. Moreover, the analysis of noise spectral ratios …
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Site Response Characteristics of Compacted Gravel Fill in Iceland
Local site conditions can greatly increase the intensity and character of earthquake shaking and, thus, the extent and type of structural damage. The removal and replacement of in-situ soils with compacted gravel-sized volcanic rock has been prevalent in the Icelandic foundation subgrade …
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Exploring the role of the arginine-methylation writer-reader pair PRMT5/SND1 in JAK2-mutant myeloproliferative neoplasms
… the symmetric dimethyl-arginine (SDMA) marks deposited by PRMT5, underpinning a potential critical role in MPN pathogenesis and treatment. SND1 is the only human protein known to contain the Staphylococcal nuclease-like domain, making it a uniquely promising therapeutic target for which there is …
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The determination of QLg and Qc as a function of frequency in the crust of Virginia and its environs
… N = 1.1 ± 0.1 for the frequency band 1-4 Hz. A site effect corrected estimate of Q<sub>(Lg,C)</sub> was also determined for the study area. This was accomplished using a spectral ratio method in which station site effects and instrument responses are canceled out. For the frequency band 1-10 Hz …
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