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 355 for “"Webs"”.
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Agreement Webs
<p> In the context of a subjective binary medical decision based on a diagnostic test we propose and study a nonlinear hierarchical model. The model includes a latent propensity-to-disease effect for each item (e.g. patient mammogram, MRI, radiograph, ultra sound, etc) and two effects for each …
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Host-Parasite Interactions Within Food Webs
… web of species interactions that compose food webs. Furthermore, host-parasite interactions are mediated by many of the same ecological factors as other species interactions, which has implications for parasitism dynamics within ecological communities. Future studies of food webs must …
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Optoelectronic fiber webs for imaging applications
… imaging is accomplished d using two fiber webs separated by a fixed distance, recovering the intensity distribution on each fiber web, and applying a phase retrieval algorithm to the two distributions. Furthermore, fiber webs consisting of six planar arrays forming a cube can be used to …
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Ants and spiders in grassland food webs
Eine Herauforderung ökologischer Forschung ist das Verständnis des Zusammenhangs von Nahrungsnetzinteraktionen und Ökosystemfunktionen. Aktuelle Studien weisen dem Fraßdruck durch invertebrate Räuber und den damit ausgelösten trophischen Kaskaden eine wichtige Rolle in terrestrischen Ökosystemen …
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The dynamics of tethers and space-webs
The thesis 'The dynamics of tethers and space-webs' investigates the motion of the Motorized Momentum Exchange Tether (MMET) on an inclined orbit, and while deploying and retracting symmetric payloads. The MMET system is used as a basis for examining the stability of space-webs using a triangular …
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Business webs: su aporte a la estrategia corporativa
Esta tesis solo está en formato papel por lo que se debe consultar en la propia Biblioteca Di Tella. La consulta se hace solo bajo reserva escribiendo a serviciosbiblio@utdt.edu.
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Assessing possible economic or operational benefits of class 3 webs without stiffeners vs class 4 webs with stiffeners in steel plate girders
… done to assess the benefits of adopting compact webs in plate girders. For a given cross-section area, different geometrical cross-section configurations were compared in an iterative process. The parameters under investigation were the moment resistance and shear carrying performance to mass …
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Online learning webs : designing support structures for online communities
… a set of design principles for building learning webs within online communities, derived from the Scripts Workshop experiment.
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Food webs: Realizing biological inspiration for sustainable industrial resource networks
… that uses analogies with biological food webs to guide industry design. Studying ecological food webs shows that among the metrics in use, critical quantities of interest for industry design include the internal cycling of energy, the ratio of producers to consumers, and the ratio of …
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Webs, Windows, and Reflections: Experiences in a Secondary Art Classroom
Action research methods were implemented to alter the attitudinal and behavioral changes occurring in adolescents during their participation in a year-long visual culture art curriculum taught in a secondary public school. As the students studied and decoded the visual language of contemporary …
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Imaging, Mechanics, Construction, and Sonification of Three-Dimensional Spider Webs
Spiders, silks and webs have adapted, survived, and prospered in most ecosystems for millions of years, despite being subjected to environmental and human pressures. They are the proof of an evolutionary success, in part due to the exceptional mechanical and biological properties of their silks but …
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Influence of Resource Pulses Following Stochastic Disturbances on Aquatic Food Webs
… stochastic disturbances affect eutrophic food webs is unknown. The objectives of this study were: 1) to estimate the range of common carp carrion biomass and nutrients released following winterkill and their resulting effects on nutrient availability and primary and secondary productivity; 2) …
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Distances Between Species in Food Webs: Evaluating Alternative Metrics' Predictive Power
<p>The complexity of ecological systems makes it difficult to predict how one species will react to the disturbance of another. Complex systems of species’ interactions can be described as ecological networks. One way in which ecological networks can give information concerning one species’ …
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Are aquatic food webs vulnerable to copper and gold engineered nanoparticles?
… understood within the context of aquatic food webs. To address this interaction, I examined the impacts of a citrate-coated gold nanoparticle (AuNPs) and a commercial pesticide containing Cu(OH)2 nanoparticles (CuNPs) on aquatic food webs under both ambient and enriched nutrient conditions. In …
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Applicability of Coarse Grid Sandwich Construction for Use as Beam Webs
Made available in DSpace on 2014-12-08T23:57:11Z (GMT). No. of bitstreams: 1 6910699.pdf: 3470491 bytes, checksum: 60f92e9296503cac33bc6e1933ed7f11 (MD5) Previous issue date: 1968
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Permanent Bracing Design for MPC Wood Roof Truss Webs and Chords
… net lateral restraining force to brace j-webs or j-chords braced by one or more continuous lateral braces (CLB's), and to develop a methodology for permanent bracing design using a combination of lateral and diagonal braces. SAP2000 (CSI, 1995), a finite element analysis program, was used …
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Fire disturbance belowground: untangling consequences for soil food webs and organic matter
… times in soils. In natural ecosystems, soil food webs interact with PyC produced after a fire. In agroecosystems, PyC, in the form of biochar, is also used as a tool to manage soil carbon and fertility. Given the widespread effects of fire on biological, chemical, and physical components of the …
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Anthropod Community Associated with the Webs of the Subsocial Spider Anelosimus Studiosus
… a diverse arthropod fauna associated with its webs. From south Georgia, I identified 1006 arthropods representing 105 species living with A. studiosus, and 40 species that were prey items from 250 webs. The arthropods seen in A. studiosus webs represented a distinct community from the …
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