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 77 for “"Root Systems"”.
-
Mixed volumes of hypersimplices, root systems and shifted young tableaux
… We generalize these results to arbitrary root systems [fee], and obtain cyclic, recursive and combinatorial formulas for the volumes of the weight polytopes ([fee]-analogues of permutohedra) as well as the mixed [fee]-Eulerian numbers. These formulas involve Cartan matrices and weighted …
-
Extended affine lie algebras and extended affine weyl groups
… study the Weyl groups of reduced extended affine root systems. We start by describing the extended affine Weyl group as a semidirect product of a finite Weyl group and a Heisenberg-like normal subgroup. This provides a unique expression for the Weyl group elements which in turn leads to a …
-
The incidence and severity of Heterobasidion annosus (Fr.) Bref. in loblolly pine plantations and the effect on radial increment growth
… inoculum. A bulldozer was utilized to excavate root systems of the trees. The root systems of all trees visually estimated to have greater than 1% infection (this included 51% of the trees sampled) were measured with a tape and the root length measurements were categorized as resin soaked, …
-
Aspects of phosphorus nutrition in endomycorrhizal fungi of the Ericaceae
… of the ericoid endophytes isolated from the root systems of Vaccinium macrocarpon, Aiton, Rhododendron ponticum L., Calluna vulgaris (L.) Hull, Erica hispidula L., and E. mauritanica L.
-
A Combinatorial Proof of the Positivity of the Lusztig q-Analogue of Weight Multiplicity for Rank 2 Lie Algebras
… interpreted as a linear combination of positive roots. We prove that all negative coefficients are cancelled in the polynomial. Further, the analysis of the root systems allows us to state formulae for every coefficient in Lusztig's q-analogue for rank 2 Lie algebras.
-
Del Pezzo surfaces with irregularity and intersection numbers on quotients in geometric invariant theory
… a purely algebraic proof of the formula when the root system decomposes into irreducible root systems of type A. We are able to remove this restriction on root systems by applying a related result of Shaun Martin from symplectic geometry.
-
Soil-plant root relationships of herbaceous biomass crops grown on the Piedmont of Virginia
… soil structure and bulk density, and the rooting of four herbaceous crops grown for biomass on three common Piedmont soil series were examined. The effect of these crops on soil properties over time was also studied. The rooting of the biomass crops studied seemed to be affected by soil …
-
Untangling clumps-factors influencing seedling ecology in a semi-desert, and the implications for restoration ecology
… rely on CAM to a variable degree and are shallow rooted, and non-Mesembryanthema (hereafter non-Mesemb) that utilize C3 photosynthesis and have deeper root systems.
-
Lattices and Their Applications to Rational Elliptic Surfaces
… surfaces, followed by a discussion of lattices, root systems and Dynkin diagrams. Known results of several authors will then be applied to determine the groups and lattices associated with a given rational elliptic surface, along with a discussion of the uses of these groups and lattices in …
-
Comparison of Bare Root vs. Potted Plants, Species Selection, and Caging Types for Restoration of a Prairie Wetland, and Quantitative Analysis and Descriptive Survey of Plant Communities and Associations at Lewisville Lake Environmental Learning Area (LLELA), Lewisville, TX
… evenness, though not different across ecosystems, demonstrated a strong seasonal component. The species list was compared with previously reported lists for Denton County, and 256 species identified had not been previously reported for the county. A wetland restoration study was conducted …
-
Root Regeneration of Transplanted Trees in Relation to the Status of Carbohydrate Levels and Root Invading Fungi
The natural root distributions of 7 species of shade trees (Norway, red and sugar maple, green ash, redbud, ginkgo and pin oak), growing under nursery conditions were characterized. In general, the vertical distribution of the major roots showed the greatest development at the soil depth of 13-38 …
-
Use of the systemic fungicide propiconazole for oak wilt management: an assessment of uncharacterized host - pathogen - fungicide interactions.
… not known if propiconazole applications prevent root graft transmission of Ceratocystis fagacearum nor if they can completely eradicate this pathogen from the root system of an infected tree. Significant translocation of propiconazole into the roots from the point of injection has not been …
-
Quantifying the Biogeochemical Impact of Land Plant Expansion in the Mid Devonian and Implications in Marine Anoxic Events
The evolution of land plant root systems occurred stepwise throughout the Devonian, with the first evidence of complex root systems appearing in the mid-Givetian. This biological innovation provided an enhanced pathway for the transfer of terrestrial phosphorus (P) to the marine system via …
-
Changes in loblolly pine seedling root growth potential over time, during cold storage, and among half-sib families
Root growth potential (RGP), the ability of a transplanted seedling to rapidly elongate existing roots and initiate new roots, is used as an indicator of seedling physiological quality. Three separate experiments were conducted on loblolly pine RGP during 1983-84 and 1984-85 using 1-0 nursery-grown …
-
Gromov-Witten theory in dimensions two and three
… quantum product is expressed in terms of an ADE root system canonically associated to G. We generalize the resulting Frobenius manifold to non-simply laced root systems to obtain an n parameter family of algebra structures on the affine root lattice of any root system. Using the Crepant …
-
Does root complexity affect the response of maize (Zea mays spp. mays) to abiotic stresses?
… and water acquisition, it is obvious that the root system of the maize plant is essential. Given the importance of the root system in plant performance, it is intuitive that differences in root characteristics would impact the performance of maize under water and nutrient limited conditions. …
-
THE INTERPLAY BETWEEN ETHYLENE SIGNALING AND FLAVONOL ANTIOXIDANTS IN MODULATING STOMATAL MOVEMENT AND ROOT ARCHITECTURE
… the individual receptor isoforms in modulating root architecture. Combined, these chapters highlight novel signaling mechanisms that control gas exchange and water loss through stomata as well as the development of root systems that are responsible for water and nutrient uptake.
-
Heavy metal redistribution in soils using compost as a soil amendment
… of heavy metals in the stem, shoot, and root systems of white clover and wheat; (3) to identify movement of heavy metals within the soil; (4) to evaluate the differences of nodule formation in Trifolim repens. Three volumes of compost were added to a heavy metal contaminated soil …
-
Aqua.Street.Scapes: Interpreting Natural Hydrologic Processes while Enhancing the Urban Streetscape
… new groundwater source and develop expansive root systems. On the surface, stormwater flows through interconnected planters where it irrigates and is filtered by vegetation before infiltrating to recharge the aquifer. At Cascade Plaza, sloping topography intersects the aquifer, and the new …
Page 1 of 4