This thesis presents an adaptive modulation scheme using a Walsh-code modulator. The Walsh-code modulator consists of a dynamic demultiplexer and predetermined sets of orthogonal Walsh-Hadamard codes. The demultiplexer can demultiplex the input bit stream into a maximum of thirty-two sub-streams. The Walsh- Hadamard codes are used to spread the spectrum...
At the intersection of higher education and politics, there is demand for an easily understood measure of student success. Graduation rate is the current measure of choice, but the definition of graduation rate excludes many categories of students and types of success particularly applicable to community colleges. The purpose of...
Continental shelf sediments are sinks for dissolved oxygen and sources of many major and minor nutrients required for oceanic surface primary production, resulting in a strong coupling between benthic and pelagic biogeochemical cycling. However, the influence and spatiotemporal variability of benthic remineralization on bottom-water chemistry and the supply of nutrients...
Land-use change in forested regions of the tropics is currently one of the largest
anthropogenic perturbations on earth; it is a force capable of altering biogeochemical cycles at local, regional, and global scales. However, significant uncertainties exist concerning the impact of land-use change on biomass and elemental pools of tropical...
Mariner 9 and Viking spacecraft observations provided evidence for planetary-scale, wavelike disturbances in the Mars winter atmosphere. Possible sources of the wave activity are dynamical instabilities, for example, barotropic and / or baroclinic instabilities. Other candidate sources are forced. quasi-stationary planetary waves—waves that arise predominantly via zonally asymmetric surface properties....
Diverse stakeholders and land management agencies are increasingly working together in “forest collaborative” groups to meet ecological, economic, and social goals on Oregon’s public lands. Many collaboratives focus on science-based ecosystem restoration. One such group is the Deschutes Collaborative Forest Project (DCFP) in central Oregon, which seeks to increase forest...
Current bioassessment efforts are focused on small wadeable streams, at least partly because assessing ecological conditions in non-wadeable large rivers poses many additional challenges. In this study, we sampled 20 sites in each of seven large rivers in the Pacific Northwest, USA, to characterize variation of benthic diatom assemblages among...
Macroinvertebrates are important for processing leaf detritus in temperate streams, but studies about their role in tropical streams often present conflicting results. Via digestive tract analyses, we assessed the diets of Phylloicus sp. larvae (Trichoptera: Calamoceratidae), collected from streams of two southeastern Brazil river basins (Araguari, Sao Francisco). We classified...
An understanding of the interactions among local environmental factors (e.g., physical habitat and water quality) and aquatic assemblages is essential to conserve biodiversity in tropical and subtropical headwater streams. We evaluated the relative importance of multiple physical and chemical habitat variables that influence the richness of Ephemeroptera, Plecoptera, and Trichoptera...
To achieve robust and stable legged locomotion in uneven terrain, animals must effectively coordinate limb swing and
stance phases, which involve distinct yet coupled dynamics. Recent theoretical studies have highlighted the critical
influence of swing-leg trajectory on stability, disturbance rejection, leg loading and economy of walking and running. Yet,
simulations...
Full Text:
leg length [L
0
]
L̇ leg length velocity [L
0
/T]
r = (x, y)T CoM position [L0 ]
ṙ = (ẋ, ẏ)T CoM
