Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Environmental Sciences (1245)
- Earth Sciences (618)
- Physics (567)
- Computer Sciences (529)
- Chemistry (477)
-
- Geology (416)
- Sustainability (385)
- Engineering (377)
- Life Sciences (353)
- Social and Behavioral Sciences (304)
- Mathematics (287)
- Water Resource Management (209)
- Oceanography and Atmospheric Sciences and Meteorology (196)
- Environmental Monitoring (171)
- Environmental Indicators and Impact Assessment (157)
- Natural Resources Management and Policy (138)
- Hydrology (129)
- Civil and Environmental Engineering (120)
- Computer Engineering (117)
- Applied Mathematics (116)
- Geography (93)
- Forest Sciences (76)
- Fresh Water Studies (76)
- Education (71)
- Systems Architecture (68)
- Medicine and Health Sciences (66)
- Glaciology (60)
- Natural Resources and Conservation (57)
- Public Affairs, Public Policy and Public Administration (57)
- Keyword
-
- Climatic changes (76)
- Sustainability (51)
- Sustainable agriculture (43)
- Hydrologic models (41)
- Finite element method (38)
-
- Machine learning (38)
- Data mining (35)
- Hydrodynamics -- Mathematical models (34)
- Image processing -- Digital techniques (34)
- City planning -- Environmental aspects (33)
- Reconstructability Analysis (33)
- Magnetic resonance imaging (31)
- Sustainable urban development (30)
- Neural networks (Computer science) (29)
- Cities and towns (28)
- Cooperation (28)
- Information Theory (28)
- Multivariate analysis discrete multivariate modeling (28)
- Numerical analysis (28)
- Partnership (28)
- Probabilistic graphical modeling (28)
- Universities and colleges (28)
- Contrast media (Diagnostic imaging) (27)
- Ecosystem services (27)
- Nanostructured materials (27)
- Fluid dynamics (26)
- Computer vision (25)
- Galerkin methods (25)
- System theory (25)
- Computer software -- Development (24)
- Publication Year
- Publication
-
- Dissertations and Theses (1027)
- Physics Faculty Publications and Presentations (336)
- Chemistry Faculty Publications and Presentations (285)
- Environmental Science and Management Faculty Publications and Presentations (278)
- Mathematics and Statistics Faculty Publications and Presentations (276)
-
- Computer Science Faculty Publications and Presentations (219)
- Geology Faculty Publications and Presentations (189)
- All Sustainability History Project Oral Histories (119)
- Institute for Sustainable Solutions Publications and Presentations (100)
- Civil and Environmental Engineering Faculty Publications and Presentations (93)
- University Honors Theses (92)
- Student Research Symposium (86)
- Systems Science Faculty Publications and Presentations (85)
- Environmental Science and Management Professional Master's Project Reports (82)
- Geography Faculty Publications and Presentations (68)
- Center for Lakes and Reservoirs Publications and Presentations (56)
- Institute for Natural Resources Publications (35)
- Systems Science Friday Noon Seminar Series (30)
- Mechanical and Materials Engineering Faculty Publications and Presentations (29)
- Campus Sustainability Office Publications, Reports and Presentations (26)
- Economics Faculty Publications and Presentations (21)
- Civil and Environmental Engineering Master's Project Reports (20)
- Special Collections: Oregon Public Speakers (20)
- Portland Institute for Computational Science Publications (17)
- Urban Studies and Planning Faculty Publications and Presentations (17)
- Biology Faculty Publications and Presentations (14)
- REU Final Reports (10)
- Anthropology Faculty Publications and Presentations (9)
- Gin McCollum (9)
- ESM Colloquium (8)
- Publication Type
- File Type
Articles 1471 - 1500 of 3798
Full-Text Articles in Physical Sciences and Mathematics
Modeling The Thickness Of Perennial Ice Covers On Stratified Lakes Of The Taylor Valley, Antarctica, Maciej K. Obryk, Peter T. Doran, Jared A. Hicks, Christopher P. Mckay, John Charles Priscu
Modeling The Thickness Of Perennial Ice Covers On Stratified Lakes Of The Taylor Valley, Antarctica, Maciej K. Obryk, Peter T. Doran, Jared A. Hicks, Christopher P. Mckay, John Charles Priscu
Geology Faculty Publications and Presentations
A 1-D ice cover model was developed to predict and constrain drivers of long-term ice thick-ness trends in chemically stratified lakes of Taylor Valley, Antarctica. The model is driven by surface ra-diative heat fluxes and heat fluxes from the underlying water column. The model successfully reproduced 16 a (between 1996 and 2012) of ice thickness changes for the west lobe of Lake Bonney (average ice thickness = 3.53 m) and Lake Fryxell (average ice thickness = 4.22 m). Long-term ice thick-ness trends require coupling with the thermal structure of the water column. The heat stored within the temperature maximum of …
The Associations Between Environmental Quality And Mortality In The Contiguous United States, 2000-2005, Yun Jian, Lynne C. Messer, Jyotsna S. Jagai, Kristen M. Rappazzo, Christine L. Gray, Shannon C. Grabich, Danelle T. Lobdell
The Associations Between Environmental Quality And Mortality In The Contiguous United States, 2000-2005, Yun Jian, Lynne C. Messer, Jyotsna S. Jagai, Kristen M. Rappazzo, Christine L. Gray, Shannon C. Grabich, Danelle T. Lobdell
OHSU-PSU School of Public Health Faculty Publications and Presentations
Background: Assessing cumulative effects of the multiple environmental factors influencing mortality remains a challenging task.
Objectives: This study aimed to examine the associations between cumulative environmental quality and all-cause and leading cause-specific (heart disease, cancer, and stroke) mortality rates.
Methods: We used the overall Environmental Quality Index (EQI) and its five domain indices (air, water, land, built and sociodemographic) to represent environmental exposure. Associations between the EQI and mortality rates (CDC WONDER) for counties in the contiguous United States (n=3109) were investigated using multiple linear regression models, and random intercept, random slope hierarchical models. Urbanicity, climate and their combination were …
Distribution, Quantification And Toxicity Of Cinnamaldehyde In Electronic Cigarette Refill Fluids And Aerosols, Rachel Z. Behar, Wentai Luo, Sabrina C. Lin, Yuhuan Wang, Jackelyn Valle, James F. Pankow, Prue Talbot
Distribution, Quantification And Toxicity Of Cinnamaldehyde In Electronic Cigarette Refill Fluids And Aerosols, Rachel Z. Behar, Wentai Luo, Sabrina C. Lin, Yuhuan Wang, Jackelyn Valle, James F. Pankow, Prue Talbot
Chemistry Faculty Publications and Presentations
Objective The aim of this study was to evaluate the distribution, concentration and toxicity of cinnamaldehyde in electronic cigarette (e-cigarette) refill fluids and aerosols.
Methods The distribution and concentration of cinnamaldehyde were determined in 39 e-cigarette refill fluids plus 6 duplicates using gas chromatography and mass spectrometry (GC/MS). A cinnamaldehyde toxicity profile was established for embryonic and adult cells using a live cell imaging assay, immunocytochemistry, the comet assay and a recovery assay.
Results Twenty of the 39 refill fluids contained cinnamaldehyde at concentrations that are cytotoxic to human embryonic and lung cells in the MTT assay. Cinnamon Ceylon aerosol …
Exploratory Modeling Of Tbi Data, Martin Zwick, Stephanie Kolakowsky-Hayner, Sadie Carney, Maya Balamane, Tracie Nettleton, D. Wright
Exploratory Modeling Of Tbi Data, Martin Zwick, Stephanie Kolakowsky-Hayner, Sadie Carney, Maya Balamane, Tracie Nettleton, D. Wright
Systems Science Faculty Publications and Presentations
Most data analyses are confirmatory, but exploratory studies can find unexpected non-linear & many-variable interaction effects. The methodology of reconstructability analysis (RA) is explicitly designed for exploratory modeling. It analyzes both nominal and continuous (binned) variables, is easily interpretable, takes standard text input, is web-accessible, and is available for research use. This presentation reports some results of applying RA to data sets from Preece (auto accidents) and Wright (auto/motorcycle/bike accidents, hit pedestrians, and falls).
Tidal-Fluvial And Estuarine Processes In The Lower Columbia River: Ii. Water Level Models, Floodplain Wetland Inundation, And System Zones, David A. Jay, Amy B. Borde, Heida Diefenderfer
Tidal-Fluvial And Estuarine Processes In The Lower Columbia River: Ii. Water Level Models, Floodplain Wetland Inundation, And System Zones, David A. Jay, Amy B. Borde, Heida Diefenderfer
Civil and Environmental Engineering Faculty Publications and Presentations
Spatially varying water-level regimes are a factor controlling estuarine and tidal-fluvial wetland vegetation patterns. As described in Part I, water levels in the Lower Columbia River and estuary (LCRE) are influenced by tides, river flow, hydropower operations, and coastal processes. In Part II, regression models based on tidal theory are used to quantify the role of these processes in determining water levels in the mainstem river and floodplain wetlands, and to provide 21-year inundation hindcasts. Analyses are conducted at 19 LCRE mainstem channel stations and 23 tidally exposed floodplain wetland stations. Sum exceedance values (SEVs) are used to compare wetland …
The Economic Value Of Forest Park Ecosystem Services: Results Of Five Focus Groups Conducted In Spring 2016, Randall A. Bluffstone, Pablo Barreyro, Jenny Dempsey Stein, Cody Kent, Antonia Machado
The Economic Value Of Forest Park Ecosystem Services: Results Of Five Focus Groups Conducted In Spring 2016, Randall A. Bluffstone, Pablo Barreyro, Jenny Dempsey Stein, Cody Kent, Antonia Machado
Economics Faculty Publications and Presentations
Objective: This initial phase of research lays the foundation for a survey using contingent valuation (CV) and choice experiment (CE) methods. We asked select Portland residents what they care about most in Forest Park, their willingness to pay (WTP) for improving ecosystem services and how they generally think about the value of those goods and services. These results will help us narrow the experimental design of the forthcoming CV/CE study.
Approach: We conducted a focus group in each of Portland’s 5 “quadrants.” We chose each location - Skyline, St. John’s, Cully, Foster-Powell and Hillsdale - based on either its proximity …
Transients In The Synchronization Of Asymmetrically Coupled Oscillator Arrays, Carlos E. Cantos, David K. Hammond, J.J.P. Veerman
Transients In The Synchronization Of Asymmetrically Coupled Oscillator Arrays, Carlos E. Cantos, David K. Hammond, J.J.P. Veerman
Mathematics and Statistics Faculty Publications and Presentations
We consider the transient behavior of a large linear array of coupled linear damped harmonic oscillators following perturbation of a single element. Our work is motivated by modeling the behavior of flocks of autonomous vehicles. We first state a number of conjectures that allow us to derive an explicit characterization of the transients, within a certain parameter regime Ω. As corollaries we show that minimizing the transients requires considering non-symmetric coupling, and that within Ω the computed linear growth in N of the transients is independent of (reasonable) boundary conditions.
Cycle Structures Of Orthomorphisms Extending Partial Orthomorphisms Of Boolean Groups, Nichole Louise Schimanski, John S. Caughman Iv
Cycle Structures Of Orthomorphisms Extending Partial Orthomorphisms Of Boolean Groups, Nichole Louise Schimanski, John S. Caughman Iv
Mathematics and Statistics Faculty Publications and Presentations
A partial orthomorphism of a group GG (with additive notation) is an injection π:S→G for some S⊆G such that π(x)−x ≠ π(y) for all distinct x,y∈S. We refer to |S| as the size of π, and if S=G, then π is an orthomorphism. Despite receiving a fair amount of attention in the research literature, many basic questions remain concerning the number of orthomorphisms of a given group, and what cycle types these permutations have.
It is known that conjugation by automorphisms of G forms a group action on the set of orthomorphisms of G. In this paper, we consider the …
Reproductive Output Of Mosses Under Experimental Warming On Fildes Peninsula, King George Island, Maritime Antarctica, Angélica Casanova-Katny, G. A. Torres-Mellado, Sarah M. Eppley
Reproductive Output Of Mosses Under Experimental Warming On Fildes Peninsula, King George Island, Maritime Antarctica, Angélica Casanova-Katny, G. A. Torres-Mellado, Sarah M. Eppley
Biology Faculty Publications and Presentations
Background: Mosses dominate much of the vegetation in the Antarctic, but the effect of climatic change on moss growth and sexual reproduction has scarcely been studied. In Antarctica, mosses infrequently produce sporophytes; whether this is due to physiological limitation or an adaptive response is unknown. We studied the effect of experimental warming (with Open Top Chambers, OTCs) on sporophyte production on Fildes Peninsula, King George Island for four moss species (Bartramia patens, Hennediella antarctica, Polytrichastrum alpinum, and Sanionia georgicouncinata). To determine whether reducing cold stress increases sexual reproduction as would be predicted if sex is …
Modeling Of Historic Columbia River Flood Impacts Based On Delft 3d Simulations, Lumas Terence Helaire
Modeling Of Historic Columbia River Flood Impacts Based On Delft 3d Simulations, Lumas Terence Helaire
Dissertations and Theses
Natural and anthropogenic processes over the past 150 years have altered the bathymetry of the Lower Columbia River (LCR) and have changed the long wave propagation of tides and floods. Possible causes for the increase in tidal amplitudes (+7% in tidal range in Astoria) are decreases in river discharge, lengthening of the river channel due to the construction of jetties at the mouth, dredging and deepening of the shipping channel, and reduction of the tidal prism due to the filling and diking of tidal wetlands. In this study, changes in the characteristics of long waves are elucidated by developing two …
Use Of Water Indices Derived From Landsat Oli Imagery And Gis To Estimate The Hydrologic Connectivity Of Wetlands In The Tualatin River National Wildlife Refuge, Debra Sue Blackmore
Use Of Water Indices Derived From Landsat Oli Imagery And Gis To Estimate The Hydrologic Connectivity Of Wetlands In The Tualatin River National Wildlife Refuge, Debra Sue Blackmore
Dissertations and Theses
This study compared two remote sensing water indices: the Normalized Difference Water Index (NDWI) and the Modified NDWI (MNDWI). Both indices were calculated using publically-available data from the Landsat 8 Operational Land Imager (OLI). The research goal was to determine whether the indices are effective in locating open water and measuring surface soil moisture. To demonstrate the application of water indices, analysis was conducted for freshwater wetlands in the Tualatin River Basin in northwestern Oregon to estimate hydrologic connectivity and hydrological permanence between these wetlands and nearby water bodies. Remote sensing techniques have been used to study wetlands in recent …
A Landscape Approach To Determining And Predicting Juvenile Coho Salmon (Oncorhynchus Kisutch) Movement Timing And Growth Patterns Prior To Ocean Entry, Amelia Lee Johnson
A Landscape Approach To Determining And Predicting Juvenile Coho Salmon (Oncorhynchus Kisutch) Movement Timing And Growth Patterns Prior To Ocean Entry, Amelia Lee Johnson
Dissertations and Theses
Coho salmon (Oncorhynchus kisutch) rely on unique habitats during the winter season, which may dictate how much individuals may grow and when migration from freshwater rearing habitat to the ocean occurs. Here I analyze movement timing and growth patterns for coho salmon through a field-based study and a literature review. For the field portion, I examined hatchery-stocked juvenile coho salmon across four stream basins in the Russian River watershed, California to determine the relative importance of climate, landscape, and fish size metrics in predicting movement and growth patterns over a winter rearing and spring smolt outmigration time period …
Watershed Response To Climate Change And Fire-Burns In The Upper Umatilla River Basin Using The Precipitation Runoff Modeling System, Kimberly Crystal Yazzie
Watershed Response To Climate Change And Fire-Burns In The Upper Umatilla River Basin Using The Precipitation Runoff Modeling System, Kimberly Crystal Yazzie
Dissertations and Theses
This study provides an analysis of watershed response to climate change and forest fire impacts, to better understand the hydrologic budget and inform water management decisions for present and future needs. The study site is 2,365 km2, located in the upper Umatilla River Basin (URB) in northeastern Oregon. The Precipitation Runoff Modeling System, a distributed-parameter, physical-process watershed model, was used in this study. Model calibration yielded a Nash Sutcliffe Model Efficiency of 0.73 for both calibration (1995-2010) and validation (2010-2014) of daily streamflow. Ten Global Climate Models using Coupled Model Intercomparison Project Phase 5 experiments with Representative Concentration …
Use Of Distance Weighted Metrics To Investigate Landscape-Stream Temperature Relationships Across Different Temporal Scales, Eric Craig Watson
Use Of Distance Weighted Metrics To Investigate Landscape-Stream Temperature Relationships Across Different Temporal Scales, Eric Craig Watson
Dissertations and Theses
Stream ecosystems have experienced significant negative impacts from land use, resource exploitation, and urban development. Statistical models allow researchers to explore the relationships between these landscape variables and stream conditions. Weighting the relevant landscape variables based on hydrologically defined distances offers a potential method of increasing the predictive capacity of statistical models. Using observations from three grouped watersheds in the Portland Metro Area (n=66), I have explored the use of three different weighting schemes against the standard method of taking an areal average. These four different model groups were applied to four stream temperature metrics: mean seven-day moving average maximum …
Orthomorphisms Of Boolean Groups, Nichole Louise Schimanski
Orthomorphisms Of Boolean Groups, Nichole Louise Schimanski
Dissertations and Theses
An orthomorphism, π, of a group, (G, +), is a permutation of G with the property that the map x → -x + π(x) is also a permutation. In this paper, we consider orthomorphisms of the additive group of binary n-tuples, Zn2. We use known orthomorphism preserving functions to prove a uniformity in the cycle types of orthomorphisms that extend certain partial orthomorphisms, and prove that extensions of particular sizes of partial orthomorphisms exist. Further, in studying the action of conjugating orthomorphisms by automorphisms, we find several symmetries within the orbits and stabilizers of this action, and …
Silicic Volcanism At The Northern And Western Extent Of The Columbia River Basalt Rhyolite Flare-Up: Rhyolites Of Buchanan Volcanic Complex And Dooley Mountain Volcanic Complex, Oregon, Adam M. Large
Dissertations and Theses
Two mid-Miocene (16.5-15 Ma) rhyolite volcanic centers in eastern Oregon, the Buchanan rhyolite complex and Dooley Mountain rhyolite complex, were investigated to characterize eruptive units through field and laboratory analysis. Results of petrographic and geochemical analysis add to field observations to differentiate and discriminate the eruptive units. Additionally, new geochemical data are used to correlate stratigraphically younger and older basalt and ash-flow tuff units with regional eruptive units to constrain the eruptive periods with modern Ar-Ar age dates.
Previous work at the Buchanan rhyolite complex was limited to regional mapping (Piper et al., 1939; Greene et al., 1972) and brief …
Quef And Quef-Like: Diverse Chemistries In A Common Fold, Adriana Bon Ramos
Quef And Quef-Like: Diverse Chemistries In A Common Fold, Adriana Bon Ramos
Dissertations and Theses
The tunneling fold (T-Fold) superfamily is a small superfamily of enzymes found in organisms encompassing all kingdoms of life. Seven members have been identified thus far. Despite sharing a common three-dimensional structure these enzymes perform very diverse chemistries.
QueF is a bacterial NADPH-dependent oxidoreductase that catalyzes the reduction of the nitrile group of 7-cyano-7-deazaguanine (preQ0) to a primary amine (preQ1) in the queuosine biosynthetic pathway. Previous work on this enzyme has revealed the mechanism of reaction but the cofactor binding residues remain unknown. The experiments discussed herein aim to elucidate the role of residues lysine 80, …
Thermal Decomposition Of Electronic Cigarette Liquids, Robert Paul Jensen
Thermal Decomposition Of Electronic Cigarette Liquids, Robert Paul Jensen
Dissertations and Theses
Electronic cigarette liquid (e-liquid) is a solution of propylene glycol and/or glycerol with varying concentrations of nicotine and flavorants. Inhalation of vaporized e-liquid is a method of nicotine delivery that is growing in popularity and is commonly regarded as safe relative to smoking traditional tobacco products. The thermal decomposition of glycerol and propylene glycol is typical of alcohols and has been investigated, although not exhaustively. In this work, samples of propylene glycol and glycerol were vaporized using an electronic cigarette (e-cigarette) and were analyzed for evidence of decomposition using nuclear magnetic resonance (NMR) spectroscopy. E-cigarettes are shown to degrade glycerol …
Relative Sensitivities Of Dce-Mri Pharmacokinetic Parameters To Arterial Input Function (Aif) Scaling, Xin Li, Yu Cai, Brendan Moloney, Yiyi Chen, Wei Huang, Mark Woods, Fergus V. Coakley, William D. Rooney, Mark G. Garzotto, Charles S. Springer Jr.
Relative Sensitivities Of Dce-Mri Pharmacokinetic Parameters To Arterial Input Function (Aif) Scaling, Xin Li, Yu Cai, Brendan Moloney, Yiyi Chen, Wei Huang, Mark Woods, Fergus V. Coakley, William D. Rooney, Mark G. Garzotto, Charles S. Springer Jr.
Chemistry Faculty Publications and Presentations
Dynamic-Contrast-Enhanced Magnetic Resonance Imaging (DCE-MRI) has been used widely for clinical applications. Pharmacokinetic modeling of DCE-MRI data that extracts quantitative contrast reagent/tissue-specific model parameters is the most investigated method. One of the primary challenges in pharmacokinetic analysis of DCE-MRI data is accurate and reliable measurement of the arterial input function (AIF), which is the driving force behind all pharmacokinetics. Because of effects such as inflow and partial volume averaging, AIF measured from individual arteries sometimes require amplitude scaling for better representation of the blood contrast reagent (CR) concentration time-courses. Empirical approaches like blinded AIF estimation or reference tissue AIF derivation …
Improving The Roadside Environment Through Integrating Air Quality And Traffic-Related Data, Christine M. Kendrick
Improving The Roadside Environment Through Integrating Air Quality And Traffic-Related Data, Christine M. Kendrick
Dissertations and Theses
Urban arterial corridors are landscapes that give rise to short and long-term exposures to transportation-related pollution. With high traffic volumes, congestion, and a wide mix of road users and land uses at the road edge, urban arterial environments are important targets for improved exposure assessment to traffic-related pollution. Applying transportation management strategies to reduce emissions along arterial corridors could be enhanced if the ability to quantify and evaluate such actions was improved. However, arterial roadsides are under-sampled in terms of air pollution measurements in the United States and using observational data to assess such effects has many challenges such as …
Breaking Spaces And Forms For The Dpg Method And Applications Including Maxwell Equations, Carsten Carstensen, Leszek Demkowicz, Jay Gopalakrishnan
Breaking Spaces And Forms For The Dpg Method And Applications Including Maxwell Equations, Carsten Carstensen, Leszek Demkowicz, Jay Gopalakrishnan
Mathematics and Statistics Faculty Publications and Presentations
Discontinuous Petrov Galerkin (DPG) methods are made easily implementable using `broken' test spaces, i.e., spaces of functions with no continuity constraints across mesh element interfaces. Broken spaces derivable from a standard exact sequence of first order (unbroken) Sobolev spaces are of particular interest. A characterization of interface spaces that connect the broken spaces to their unbroken counterparts is provided. Stability of certain formulations using the broken spaces can be derived from the stability of analogues that use unbroken spaces. This technique is used to provide a complete error analysis of DPG methods for Maxwell equations with perfect electric boundary conditions. …
Molecular Probes For Pancreatic Cancer Imaging, Lei Wang
Molecular Probes For Pancreatic Cancer Imaging, Lei Wang
Dissertations and Theses
Pancreatic ductal adenocarcinoma (PDAC) has the poorest five-year survival rate of any cancer. Currently, there are no effective diagnostics or chemotherapeutics. Surgical resection is the only curative therapy. However, most patients experience recurrence due largely to challenges in assessing tumor margin status in the operating room. Molecular probes that selectively highlight pancreatic cancer tissue, having the potential to improve PDAC margin assessment intraoperatively, are urgently needed. In this work, a series of red and near-infrared fluorescent probes is reported. Two were found to distribute to normal pancreas following systemic administration. One selectively accumulates in genetically modified mouse models of PDAC, …
Groundwater-Surface Water Interactions Near Mosier, Oregon, Cullen Brandon Jones
Groundwater-Surface Water Interactions Near Mosier, Oregon, Cullen Brandon Jones
Dissertations and Theses
The town of Mosier, Oregon, is located near the east, dry end of the Columbia River Gorge, and the local area is known for cherry orchards that rely heavily on groundwater for irrigation. The CRBG groundwater system in Mosier has experienced groundwater declines of up to 60 meters due to over-pumping and or commingling. Declining groundwater levels have led to concerns over the sustainability of the resource, as it is the principle water source for irrigation and domestic use. Despite numerous previous studies of groundwater flow in CRBG aquifers here and elsewhere in the Columbia River basin, an aspect that …
Multiple New-Particle Growth Pathways Observed At The Us Doe Southern Great Plains Field Site, Anna L. Hodshire, Michael J. Lawler, Jun Zhao, John Ortega, Coty Jen, Taina Yli-Juuti, Jared F. Brewer, Jack K. Kodros, Kelley C. Barsanti, Dave R. Hanson, Peter H. Mcmurry, James N. Smith, Jeffery R. Pierce
Multiple New-Particle Growth Pathways Observed At The Us Doe Southern Great Plains Field Site, Anna L. Hodshire, Michael J. Lawler, Jun Zhao, John Ortega, Coty Jen, Taina Yli-Juuti, Jared F. Brewer, Jack K. Kodros, Kelley C. Barsanti, Dave R. Hanson, Peter H. Mcmurry, James N. Smith, Jeffery R. Pierce
Civil and Environmental Engineering Faculty Publications and Presentations
New-particle formation (NPF) is a significant source of aerosol particles into the atmosphere. However, these particles are initially too small to have climatic importance and must grow, primarily through net uptake of low volatility species, from diameters ∼ 1 to 30–100 nm in order to potentially impact climate. There are currently uncertainties in the physical and chemical processes associated with the growth of these freshly formed particles that lead to uncertainties in aerosol-climate modeling. Four main pathways for new-particle growth have been identified: condensation of sulfuric-acid vapor (and associated bases when available), condensation of organic vapors, uptake of organic acids …
Minimizing Corrosion Of Outdoor Metalworks Using Dispersed Chemically Stabilized Nanoclays In Polyvinylidene Fluoride Latex Coatings, Natasja Alexandria Swartz, Capri A. Price, Tami Lasseter Clare
Minimizing Corrosion Of Outdoor Metalworks Using Dispersed Chemically Stabilized Nanoclays In Polyvinylidene Fluoride Latex Coatings, Natasja Alexandria Swartz, Capri A. Price, Tami Lasseter Clare
Chemistry Faculty Publications and Presentations
Nanoclays are small enough to appear optically transparent, yet they have large surface-to-volume and high aspect ratios that can significantly inhibit water diffusion when incorporated into protective coatings. Clear coatings, which minimally affect the aesthetics of metalworks, are commonly applied to outdoor metalworks, such as sculptures, to prevent and slow corrosion. In recent years, waterborne clear coatings, rather than solvent-based clear coatings, are increasingly used in many applications to reduce the quantity of volatile organic components in the formulation, yet the performance of dry films produced from waterborne colloidal suspensions is generally poorer. In this work, we aim to improve …
Do Forest Commons Contribute To International Environmental Initiatives? A Socio-Ecological Analysis Of Nepalese Forest Commons In View Of Redd+, Harisharan Luintel
Do Forest Commons Contribute To International Environmental Initiatives? A Socio-Ecological Analysis Of Nepalese Forest Commons In View Of Redd+, Harisharan Luintel
Dissertations and Theses
Forests in developing countries have the potential to contribute to global efforts to mitigate climate change, promote biodiversity and support the livelihoods of rural, local people. Approximately one-fourth of such forests are under the control of local communities, which primarily manage forests for subsistence and to meet their livelihood needs. The trend of bottom-up community control is increasing through the adoption of decentralization reforms over the last 40 years. In contrast, the United Nations has introduced the top-down program, Reducing Emissions from Deforestation and Forest Degradation (REDD+) for the conservation and enhancement of forest carbon and the sustainable management of …
Expanding The Versatility Of Nano Assembled Capsules As Platform Of Potential High Payload Mri Contrast Agents, Annah Farashishiko
Expanding The Versatility Of Nano Assembled Capsules As Platform Of Potential High Payload Mri Contrast Agents, Annah Farashishiko
Dissertations and Theses
Magnetic resonance imaging (MRI) has become a powerful clinical modality in diagnostic medicine. It is non-invasive and offers high spatial and temporal resolution. The goal of molecular imaging is to reveal the pathophysiology underlying the observed anatomy and diagnose diseases. The detection of pathological biomarkers can lead to early recognition of diseases and improved monitoring for recurrence. Clinically available contrast agents are limited in their discrimination of contrast between tissues and they tend to have very high detection limits. Because biomarkers are very low in concentration there is a need for high payload deposition of contrast agent (CA) and targeted …
Household Water Filter Use Characterization In Rural Rwanda: Signal Interpretation, Development And Validation, Sarita Lucia Tellez Sanchez
Household Water Filter Use Characterization In Rural Rwanda: Signal Interpretation, Development And Validation, Sarita Lucia Tellez Sanchez
Dissertations and Theses
Access to safe drinking water is an important health factor in many developing countries. Studies have shown that unsafe drinking water and poor sanitation practices leads to diarrheal disease, which is one of the leading causes of death of children under five in developing countries. Provision and proper use of household water filters have been shown to effectively improve health.
This thesis is focused on the refinement and validation of algorithms for data collected from pressure transducer sensors that are used in household water filters (the Vestergaard Frandsen LifeStraw Family 2.0) deployed in Rwanda by the social enterprise DelAgua Health. …
Discovery And Characterization Of The Proteins Involved In The Synthesis Of N⁶-Threonylcarbamoyl Adenosine, A Nucleoside Modification Of Trna, Christopher Wayne Deutsch
Discovery And Characterization Of The Proteins Involved In The Synthesis Of N⁶-Threonylcarbamoyl Adenosine, A Nucleoside Modification Of Trna, Christopher Wayne Deutsch
Dissertations and Theses
N6-threonylcarbamoyl adenosine (t6A) is a universally conserved tRNA modification found at position 37 of tRNAs which decode ANN codons. Structural studies have implicated its presence as a requirement for the disruption of a U-turn motif in certain tRNAs, leading to the formation of properly structured anticodon stem loop. This structure is proposed to enhance the base pairing between U36 of tRNA and A1 of the codon which aids in translational frame maintenance.
Despite significant effort since its discovery in the 1970s the enzymes involved in its biosynthesis remained undiscovered. Bioinformatic analysis identified two proteins as likely …
Variation In Tussock Architecture Of The Invasive Cordgrass Spartina Densiflora Along The Pacific Coast Of North America, Jesus M. Castillo, Brenda J. Grewall, Andrea Pickart, Enrique Figueroa, Mark D. Sytsma
Variation In Tussock Architecture Of The Invasive Cordgrass Spartina Densiflora Along The Pacific Coast Of North America, Jesus M. Castillo, Brenda J. Grewall, Andrea Pickart, Enrique Figueroa, Mark D. Sytsma
Environmental Science and Management Faculty Publications and Presentations
Some introduced species spread rapidly beyond their native range and into novel habitats mediated by a high degree of phenotypic plasticity and/or rapid evolutionary responses. In this context, clonality has been described as a significant factor contributing to invasiveness. We studied the abiotic environment and the responses of different tussock architecture traits of the invasive cordgrass Spartina densiflora Brongn. (Poaceae). A common garden experiment and field studies of S. densiflora in salt marshes across a wide latitudinal gradient from California (USA) to British Columbia (Canada) provided a model system for an integrated study of the potential mechanisms underlying the response …