Index Catalog // ScholarsArchive@OSU

High-frequency measurement of seawater chemistry: Flow-injection analysis of macronutrients

Creator:: Hales, Burke, van Geen, Alexander, and Takahashi, Taro
Abstract:: We adapted a commercially available flow‐injection autoanalyzer (Lachat Quik‐Chem 8000) to measure seawater nitrate concentrations at a rate of nearly 0.1 Hz and phosphate and silicate concentrations at a rate half that. Several minor improvements, including reduced sample‐loop size, high sample flushing rate, modified carrier chemistry, and use of peak...
Resource Type:: Article
Full Text:: Burke Hales, Alexander van Geen, and Taro Takahashi. High

Distribution and variability of iron input to Oregon coastal waters during the upwelling season

Creator:: Chase, Zanna, Hales, Burke, Cowles, Timothy J., Schwartz, Roseanne, and van Geen, Alexander
Abstract:: We measured iron concentrations off the Oregon coast in spring (May–June) and summer (August) of 2001 as part of the Coastal Ocean Advances in Shelf Transport (COAST) program. Dissolvable and total dissolvable iron levels in surface waters were generally higher in spring (mean of 2.1 and 33.9 nmol L¯¹, respectively)...
Resource Type:: Article
Full Text:: Schwartz and Alexander van Geen Lamont Doherty Earth Observatory of Columbia University, Palisades, New

Iron, nutrient, and phytoplankton distributions in Oregon coastal waters

Creator:: Chase, Zanna, van Geen, Alexander, Kosro, P. Michael, 1951-, Marra, John, and Wheeler, Patricia A.
Abstract:: The relationship between iron and nitrate concentrations was examined off the coast of Oregon during the upwelling season. Surface Fe and N (nitrate + nitrite) concentrations measured underway by flow injection analysis ranged from <0.3 to 20 nmol L¯¹ and <0.1 to 30 mmol L¯¹, respectively. Total dissolvable Fe concentrations,...
Resource Type:: Article
Full Text:: distributions in Oregon coastal waters Zanna Chase,1,2,3 Alexander van Geen,1 P. Michael Kosro,4 John Marra,1

The Alexander polynomial

Creator:: Scherich, Nancy
Abstract:: The Alexander polynomial is a well understood classical knot invariant with interesting symmetry properties and recent applications in knot Floer homology. There are many different ways to compute the Alexander polynomial, some involving algebraic techniques and others more geometric or combinatorial approaches. This is an interesting example of how different...
Resource Type:: Capstone Project
Full Text:: THE ALEXANDER POLYNOMIAL NANCY SCHERICH 1. INTRODUCTION

College Student Services Administration Program Portfolio

Creator:: Green, Michael
Abstract:: This work is a representation of my competencies, experiences, reflections and learning through the College Student Services Administration Master’s of Education program at Oregon State University. This paper consists of both research and reflective writing and demonstrates in-depth my learning and development over the past two years in the College...
Resource Type:: Capstone Project
Full Text:: chair, Eric Alexander, for all of the hard work and time he devotes to assisting me during this

Pillaging Bloodwood: An Exploratory Examination of Illegal Deforestation in Guinea-Bissau Through Forest Disturbance Algorithms and Unsupervised Clustering Techniques

Creator:: Walters, Alexander E.
Abstract:: Environmental crime around the world, such as trafficking in illegal timber, is directly related to political instability. Traffickers exploit weak, fragile, and chaotic political circumstances to illegally extract high-value commodities, challenging the extent to which conservation goals are achievable in resource rich developing countries. Rosewood is the largest traded endangered...
Resource Type:: Masters Thesis
Full Text:: would also alike to acknowledge the help of my committee members: Jamon Van Den Hoek, Reem Hajjar and

Ensemble-variational data assimilation for dynamically challenging coastal ocean circulation

Creator:: Pasmans, Ivo
Abstract:: Currently, forecasts produced by the Oregon-Washington (OR-WA) Coastal Ocean Forecast System are constrained by assimilation of only surface observations. The 4-dimensional variational (4DVAR) data assimilation (DA) algorithm is utilized to combine the model and the data, with the time-independent forecast ("background'') error covariance B. In this study, two possible improvements...
Resource Type:: Dissertation
Full Text:: Circulation Abstract approved: Alexander L. Kurapov Currently, forecasts produced by the Oregon-Washington

Analysis and synthesis of exponentially tapered, nonuniform transmission line impedance transformers

Creator:: David, Frank Kolar
Abstract:: The exponentially tapered, nonuniform transmission' line, applied as an impedance transformer, is analyzed and modified. The analysis develops an expression for the input reflection coefficient that has the magnitude and phase as distinct functions. This allows ease in comparing the approximate and exact solutions and in developing the S-parameters for...
Resource Type:: Masters Thesis
Full Text:: Impedance Transformers Abstract approved: Signet re) (Gerald C. Alexander) The exponentially tapered

Efficacy of Cultural Practices for Mitigating the Negative Impacts of Grapevine Red Blotch Virus on Vine Physiology and Fruit Composition in Oregon Pinot Noir

Creator:: Copp, Cody R.
Abstract:: The recently emerged Grapevine Red Botch Virus (GRBV) impedes proper berry ripening primarily by reducing sugar accumulation and color development in red-fruited Vitis vinifera L. cultivars. To date, there is no recommended management strategy for virus spread or the impacts of the disease beyond removal and replacement of infected vines....
Resource Type:: Masters Thesis
Full Text:: : ______________________________________________________ Alexander D. Levin The recently emerged Grapevine Red Botch Virus (GRBV) impedes

Investigating Alternative Irrigation Strategies and Sources for the Cool-Humid Willamette Valley

Creator:: Olsen, Conner J.
Abstract:: Rising human populations and climate change are putting increasing demands on our already-limited freshwater sources. In response to these concerns, homeowners and municipalities have been encouraged to replace turfgrass – a plant with relatively high irrigation needs – with drought-tolerant plants that do not require frequent irrigation. However, the many...
Resource Type:: Masters Thesis
Full Text:: Cool-Humid Willamette Valley Abstract approved: Alexander R. Kowalewski Rising

ScholarsArchive@OSU

High-frequency measurement of seawater chemistry: Flow-injection analysis of macronutrients

Distribution and variability of iron input to Oregon coastal waters during the upwelling season

Iron, nutrient, and phytoplankton distributions in Oregon coastal waters

The Alexander polynomial

College Student Services Administration Program Portfolio

Pillaging Bloodwood: An Exploratory Examination of Illegal Deforestation in Guinea-Bissau Through Forest Disturbance Algorithms and Unsupervised Clustering Techniques

Ensemble-variational data assimilation for dynamically challenging coastal ocean circulation

Analysis and synthesis of exponentially tapered, nonuniform transmission line impedance transformers

Efficacy of Cultural Practices for Mitigating the Negative Impacts of Grapevine Red Blotch Virus on Vine Physiology and Fruit Composition in Oregon Pinot Noir

Investigating Alternative Irrigation Strategies and Sources for the Cool-Humid Willamette Valley

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