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.
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Showing 1 to 20 of 21 for “"Cacti"”.
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Permutohedra, configuration spaces and spineless cacti
… of the space<em>Cact(n)</em> of spineless cacti with n lobes. Based on these structures, direct homotopy equivalences between <em>F</em> (R<sup>2</sup>, <em>n)</em> and <em>Cact(n)</em> are then given. It is well known that the little 2-discs space <em>D<sub>2</sub>(n)</em> is homotopy …
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Determinants of the structural niches of columnar cacti in the Southwest
I evaluated whether morphological differences among populations of Carnegiea gigantea and Pachycereus pringlei actually represent evolutionary adaptation, different developmental responses to the environment, or simply differences in population age structure. Populations of Carnegiea running east …
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Morphological and Biochemical-based Phylogenetic Analyses of Opuntiae Prickly Pear Cacti of Southern California
<p>Phylogenetic analyses are used to suggest phylogenetic relationships for series Opuntiae (genus Opuntia, subgenus Opuntia) present in Southern California. The bases of the analyses were electrophoretic characters utilizing allelic band data obtained from electrophoretic assays conducted in this …
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RELAMPAGO-CACTI drop size distribution observations and the implications for cloud and hydrologic studies
Comparisons of drop size distributions (DSD) properties and rainfall modes among three deep convective regions (the U.S. Southern Great Plains, in Córdoba Province in subtropical South America, and Manacapuru in central Amazonia) where heavy rain-producing systems contribute the majority of …
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Lemur catta in the Region of Cap Sainte-Marie, Madagascar: Introduced cacti, xerophytic Didiereaceae-Euphorbia bush, and tombs
This is the first study to document the natural history of <italic>Lemur catta</italic>, ring-tailed lemurs, outside of gallery forest environments: in xerophytic Didiereaceae-<italic>Euphorbia</italic>, bush habitat that represents over 90% of this species' potential range. Moreover, this study is …
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Inspiration by Nature: Biomimetic Research Informs Adaptable Building Skin System for Natural Ventilation and Daylight in Hot Dry Climate (Yazd, Iran)
… plant species, including <strong><em>Barrel Cacti,</em></strong> have developed long-term evolutionary adaptable traits to survive in extreme climates. The most important trait of cacti in extreme hot dry climates is to reduce water evaporation and increase water storage. The exterior skin of …
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Very Cost Effective Partitions in Graphs
… of graphs G, including Cartesian products and cacti graphs, to determine whether G has a very cost effective bipartition.</p>
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Taxonomy and phytogeography of the Cactaceae of eastern Brazil
… documented little of this due to the difficulty cacti present for preservation and description of living and museum specimens. Most taxa now known were discovered in the past 100 years, the majority being named and classified by horticulturists, whose activities greatly distorted their number and …
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Graphical Indices and their Applications
… the Randić index of a class of graphs known as cacti, and we find a functional relationship between the Wiener index and the degree distance for several types of graphs. We also develop an algorithm to find the structure that maximizes the number of subtrees of trees, a characterization of the …
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Grafting the cactus
… of the road, then recovered and regrown. Many cacti can be grafted, meaning pieces of two different species – perhaps native to two different landscapes – will fuse together into something made up of both. Grafting becomes a structuring metaphor for the collection, and for the speaker who seeks …
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On Topological Indices And Domination Numbers Of Graphs
… Zagreb indices). The extremal cacti with a distance-based topological index (PI index) are explored. Furthermore, we provide the extremal graphs with these corresponding topological indices. We establish and verify a proposed conjecture for the relationship between the …
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Looking for love on a chilly night: The Colorado brown tarantula mating season
… significantly associated with the presence of cacti, and tarantula burrows were significantly clustered within the interior of the Comanche National Grassland, suggesting an association with certain vegetation cover. This study has implications for other edge populations and ectotherms and …
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Factors Controlling the Extent and Location of Cumulus Convection over the Sierras de Córdoba
… Aerosol, and Complex Terrain Interactions (CACTI) field campaign. While it is well understood that mountains are effective at producing cloud cover via thermal and mechanical lifting of the air to saturation, it is less well understood what factors create nuanced differences in the location …
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Fire effects on small mammals and vegetation of the Northern Chihuahuan Desert
… creosotebush. tarbush (Flourencia cemua). and cacti species (Opuntia) were reduced 1 year post bum. Mortality of creosotebush (25.6%) was lower than previously reported for summer burns. Tarbush monality (26 3°o) was similar to creosotebush on the study sites. Above average precipitation during …
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Connecting models of configuration spaces: From double loops to strings
… <em>C</em> 2 itself and the operad of spineless cacti. To this end, we construct a new suboperad of <em>C</em>2, which we name the operad of tethered 2-cubes. Much of our analysis involves examining trees labeled by elements of the operad of little intervals, <em>C</em>1. In the final chapter, we …
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The Comparative Anatomy of Extrafloral Nectaries in the Cactus Family (Cactaceae)
… reduce herbivory. EFNs were first observed in cacti in 1837 and have been noted in at least 25 different genera. Morphologically, cactus EFNs have been categorized as belonging to one of four distinct groups: short, obviously modified spines (type 1 EFNs); nectaries that resemble ordinary …
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Comparative Anatomy of the Stem in the Carrion Flowers (Apocynaceae-Asclepiadoideae)
… of other stem succulents, most notably the cacti, are generally absent from the stapeliads.
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Host plant associations of two cochineal insect species, Dactylopius ceylonicus and D. opuntiae (Dactylopiidae: Hemiptera), on the invasive cactus species Opuntia monacantha, O. ficus-indica and a possible hybrid cactus, in South Africa
… are all exclusively associated with opuntioid cacti and therefore pose minimal risk of non-target effects in the Old World where there are no native Cactaceae. However, the ability of cochineal to use more than one host plant species has validated reports of inadvertent displacement of …
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Combinatorics of colored factorizations, flow polytopes and of matrices over finite fields
… proof of the number of planar trees and cacti with given vertex degree distribution calculated by Goulden and Jackson. In the second part we establish the relationship between volumes of ow polytopes associated to signed graphs and the Kostant partition function. A special case of this …
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"a good rain and a baby calf are always welcome"
… of green from mesquite trees, live oaks, cedars, cacti, and lichens. The topography constantly changes. Boulder-sized shards of granite seem to just explode out of escarpments. In other places, horizontal bands of granite cantilever from the tops of hills, displaying the years and time of its …
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