The Hanford Nuclear Reservation drew public ire during the 1980s and 1990s when activist groups forced the declassification of 19,000 documents and discovered proof of accidental and intentional releases of radioactive materials into the environment. These releases had been kept from the public. Although many locals had for decades wondered...
In this thesis we study mathematical and computational models for phenomena of flow and transport in porous media in the presence of changing pore scale geometries. The differential equations for the flow and transport models at Darcy scale involve the coefficients of permeability, porosity, and tortuosity which depend on the...
In 2013, the U.S. Fish and Wildlife Service (USFWS) Conservation
Objectives Team (COT) identified wildfire and the associated
conversion of low- to mid-elevation sagebrush (Artemisia tridentata)
habitats to invasive annual grass-dominated vegetation communities
as the two primary threats to the sustainability of Greater sage-grouse
(Centrocercus urophasianus, hereafter GRSG) in the...
Rapid rates of biodiversity loss have supported the notion that Earth is experiencing a sixth major extinction event. The causes of worldwide biodiversity loss are multifaceted and context dependent. One of the most prominent groups experiencing population declines and extinctions are amphibians. Several pathogens and their associated diseases are especially...
Soil properties may hold the key to improved predictions of soils during digital soil mapping (DSM), which has developed with a focus on environmental factors external to soil. The spatial variability in soil properties was modeled across Malheur National Forest in eastern Oregon as an approach to improve DSM. The...
Garden-based learning (GBL) with young people has long been viewed as an educational experience capable of teaching numerous types of science content including general science, technology, engineering and math (STEM), as well as discipline specific areas such as biology, horticulture, agriculture and nutrition. However, much of the GBL literature focuses...
A biosystematic investigation was undertaken in 15
species and three subspecies of the genus Aster, in western
North America. Previous studies had been based entirely on
external morphological features, and it was believed that
much could be learned about the natural affinities of the
taxa by exploring their cytological and...
This study was conducted to determine the effects of insect
infestation on areas of heating in stored grain, and to demonstrate
the ability of four species of insects to initiate or promote the
spread of these heating areas. The four insects used were the
granary weevil Sitophilus granarius (L.), the...
Dihalocarbenes have been generated mainly by thermal decomposition
of sodium trihaloacetate and phenyl (trihalomethyl)mercury,
and give gem-dihalocyclopropyl adducts with various steroid olefins.
A new procedure involving the use of sealed tubes makes possible the
addition of dihalocarbenes to sterically hindered olefins. In this manner,
7-cholestenyl benzoate when treated with PhHgCC1₃...