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.
Results
Showing 1 to 20 of 30 for “"renewable natural resources"”.
-
Three Essays on the Economics of Agricultural Production Behavior, Renewable Natural Resources, and Welfare Dynamics
… that directly interacts with agriculture and natural resources for their daily bread is declining amidst structural transformation (Timmer et al. 2009). Commensurately, the expectations and hopes placed on the remaining food and fiber producers in the world seems to ever increase, not only in …
-
Development of a biodegradable biopolymer from renewable natural resources suitable for additive manufacturing and bone tissue engineering
… Chitosan, a biocompatible and biodegradable naturally derived polymer, offers great promise as a biomaterial for tissue engineering applications. Chitosan scaffolds have previously been fabricated using additive manufacturing techniques, however, the use of crosslinkers, weak mechanical …
-
Modeling the spatial and temporal dynamics of coastal marsh birds
Wetland birds are likely to be influenced by habitat at multiple spatial scales, yet few studies have investigated bird responses at both broad and fine scales. Northern Gulf Coast marshes are dynamic ecosystems, and they provide an ideal place to examine habitat across spatial and temporal scales. …
-
Creep behavior of natural fiber reinforced polymer composites
Creep behavior of natural fiber/polymer composites (NFPCs) was studied in response to the increasing application of this material as structural building products. Factors that influence creep behavior of the composites were investigated by analyzing creep curves of several different NFPC systems, …
-
A Standardized Ultrasonography Classification for Channel Catfish Ovarian Development
The goal of this dissertation was to develop application of ultrasonography as a decision-making tool in genetic improvement programs for channel catfish Ictalurus punctatus. A literature review on the use of ultrasonography in fish reproduction generated a comprehensive reference data set intended …
-
Developing tools to identify factors that limit production in coastal marshes
… where all three limiting factors fluctuated naturally. I also compared the leaf tissue chemistry of S. patens and Spartina alterniflora, the second most common plant in Louisiana’s coastal marshes, to facilitate comparisons between the species. Finally, I investigated the effects of flooding …
-
High-throughput sperm cryopreservation of aquatic species
… sperm to become a practical form of genetic resources applicable for aquatic genetic improvement and conservation.
-
PMI 5011 regulates the ubiquitin proteasome system in skeletal muscle
Insulin resistance in type 2 diabetes is associated with impaired glucose and protein metabolism in skeletal muscle. The impaired insulin signaling in skeletal muscle affects muscle mass by tilting the balance between skeletal muscle protein synthesis and degradation toward degradation, a process …
-
Macroinvertebrate community of ecology of lowland, subtropical streams in Louisiana
Freshwater ecosystems, particularly streams and rivers, have been the subject of prodigious research. Unfortunately, in comparison to neighboring regions, the Gulf of Mexico coastal plain has not received as much attention. Therefore, I collected data on the macroinvertebrates of these streams to …
-
Nitrogen and Carbon Export to the Gulf of Mexico by the Atchafalaya River, a Major Distributary of the Mississippi River
Summer hypoxia in the Northern Gulf of Mexico has been attributed to large nutrient inputs, especially nitrate-nitrogen, from the Mississippi-Atchafalaya River system. The 2008 Gulf Hypoxia Action Plan calls for river corridor wetland restoration to reduce nitrate loads, but it is largely unknown …
-
Effects of Inbreeding on Endangered Red Wolves (Canis rufus)
Inbreeding depression, the reduction in offspring fitness caused by mating among close relatives, is widespread in small populations and a major concern in conservation biology because it can affect population persistence. The negative effects of inbreeding results in the evolution of inbreeding …
-
Energy, environment, and sustainability: a hierarchical analysis of south Louisiana
… the sustainability of industrial, human, and natural systems in south Louisiana. Chapter 1 is a general introduction. Chapter 2 calculates the energy return on financial investment (EROFI) of oil and gas production in the ultra-deepwater Gulf of Mexico (GoM) in 2009 and the Macondo Prospect …
-
Species Composition and Spatial Ecology of Amazonian Understory Mixed-Species Flocks in a Fragmented Landscape
With the ongoing advance of the agricultural frontier in the Amazon basin, it is inevitable that heterogeneous landscapes will play a key role in conservation. These landscapes are mostly composed of patchworks of small forest fragments, secondary forests and roads. Conservation, however must take …
-
Branch, crown, tree and stand water flux in an 180-year-old loblolly pine plantation after thinning, fertilization, and throughfall exclusion treatments
Branch and tree sap flux density (SFD) was measured to evaluate the effects of thinning, fertilization, and throughfall exclusion treatments on water use by loblolly pine (Pinus taeda L.) trees. Variations in SFD at different radial xylem depths were also examined to improve estimates of tree water …
-
Modeling longleaf pine (Pinus palustris Mill) wood properties using near infrared spectroscopy
This research demonstrated model development for important wood properties using near infrared spectroscopy (NIR); it considered the effect of outside sources of error, and the ability of NIR to measure fiber morphology. Strength, stiffness, and density were successfully modeled from wood samples …
-
Wood liquefaction in the presence of phenol with a weak acid catalyst and its potential for novolac type wood adhesives
Wood liquefaction was conducted using phenol as a reagent solvent with oxalic acid as a catalyst. A series of studies were done on liquefied wood, liquefied wood residues, novolac-type liquefied wood resins, and bio-composites fabricated from liquefied wood resin. The results of the liquefied wood …
-
Effects of body size on goose behavior: lesser snow goose and Ross's goose
… different climates, habitat types, and food resources, and migrate variable distances with different energetic costs. Accordingly, I controlled for such variation by comparing the behavior and physiology of lesser snow geese (hereafter snow geese) and Ross's geese, which are closely related …
-
Ecological-Hydrological Feedback in Forested Wetlands
… gaps where progress could benefit management of natural resources and predicting of changes in surface geophysical cycles. Two specific needs are a better understanding of (1) wetland tree responses to hydrologic variations, and (2) the effects of the forest and associated tree stressors on …
-
Rice straw fiber polymer composites: thermal and mechanical performance
… model thermal decomposition process of common natural fibers with detailed analysis on rice straw system. Assuming a global model occurring within the entire degradation of natural fibers with consideration of fiber as one pseudo-component, model can be used to describe both isothermal and …
-
Effects of Forest Fragmentation on Central Amazonian Bird Demography
Avian diversity in degraded fragmented Amazonian landscapes depends on the persistence of species in cleared and disturbed areas. Regenerating forest facilitates bird dispersal within degraded Amazonian landscapes and may tip the balance in favor of persistence in previously depauperate habitat …
Page 1 of 2