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 70 for “"castor"”.
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Green composites from castor oil and renewable reinforcing materials: maleated castor oil-polystyrene matrix reinforced with greige fibre
… by turning to plant-based oils, for example castor oil, to be used in the synthesis of a variety of monomers. Castor oil is suitable as it is non-edible; thus its use does not deplete food sources and it has high chemical reactivity. In this study, medical grade castor oil was maleated by the …
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Polyurethane foams containing renewable castor oil replacement
… as alternatives to petroleum. In this project, castor oil was chosen as a renewable biobased polyol in order to replace the nonrenewable petroleum-based polyols. Water-blown rigid foams were made from polyols with different levels of castor oil replacement. For foams without castor oil and with …
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The ecological role of beavers (Castor canadensis) in a Southwestern desert stream
The ecological impact of beavers on a stream in the southwestern United States was investigated to determine if beavers have impact on community and ecosystem level processes in a manner similar to what has been documented in more mesic regions. Specifically, my goals were to determine: (1) whether …
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Beaver (Castor Canadensis) Impacts on Herbaceous and Woody Vegetation in Southeastern Georgia
North American beavers are considered ecosystem engineers. Their activities can quickly and drastically alter habitat properties and perhaps permit highly aggressive colonizing plants, notably non-native species, to invade and potentially dominate. This study examined if beavers in southeastern …
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Selection of castor with divergent concentrations of ricin and RCA using radial immunodiffusion
… the most limiting factors in the production of castor (Ricinus communis L.) is the presence of two toxic proteins, ricin and RCA. Ricin and RCA's presence in the endosperm of the seed creates potential health hazards to both producers and processors. The objectives of this research were to …
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A novel process for the production of castor oil by direct solvent extraction
… a process for the direct solvent extraction of castor oil seeds. A literature survey confirmed the desirability of establishing such a process with emphasis on the decortication, size, reduction, detoxification-deallergenization, and solvent·extraction operations. A novel process was developed …
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L' impact du Castor du Canada sur les communautés de coléoptères foreurs de bois
… étude, nous nous intéressions à l'impact du castor sur ces communautés de coléoptères dans le Parc National de Kouchibouguac, durant les étés 2015 et 2016. Des sites altérés par le castor (CAS) ont été appariés avec des cours d'eau inaltérés (TEM), proches desquels nous avons …
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Un ingénieur d'écosystème, le castor, et son influence spatio-temporelle sur la biodiversité des écosystèmes forestiers
… de barrages et l'abatage d'arbres, les castors modfient drastiquement les paysages riverains, ce faisant ils ont le potentiel de modifier la composition en espèces, de favoriser une richesse spécifique élevée et d'influencer la diversité fonctionnelle des communautés. Nous avons …
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Detoxificação mista do farelo de mamona e sua utilização na terminação de cordeiros
… on the efficiency of detoxification process of castor meal and testing inclusion levels in lambs feeding. Detoxification capacity through interactions between the time of autoclaving and the amount of CaO was evaluated. It was used a 5x2 factorial design, five levels of calcium oxide (0, 10, 20, …
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Crescimento da mamoneira em função das doses de boro, esterco bovino e cobertura morta.
… influence the growth of crops, and the castor bean (Ricinus communis L.) in a culture highly demanding high levels of fertility and soil organic matter. The aim of this study was to evaluate the effect of boron levels, cattle manure and use of mulch on the vegetative growth of castor …
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Identification and evolution of quantities of interest for a stochastic process view of complex space system development
… three space hardware development projects. The CASTOR satellite provides the opportunity for retrospective identification of quantities of interest and their evolution through time. As a complement to CASTOR, the preliminary design of the REXIS x-ray spectrometer provides the foundation for …
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An integrated evolutionary model approach to small satellite engineering
… integrated systems models for the MOTV and CASTOR satellites are described and critiqued against the IEM approach, and a new simulation framework is developed for CASTOR utilizing the IEM framework. The development and use of a TDA for the FalconSAT-3 satellite is also described. The thesis …
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Cissampelos sympodialis EICHL. (Menispermaceae): avaliação das atividades antimotilidade e antidiarreica in vivo.
… gastric emptying , intestinal normal transit and castor oil - induced diarrhea. The first two models evaluated the antimotility activity whi le the model of castor oil - induced diarrhea was used to evaluate the antidiarrheal activit y by means of the latter was investigated the possible mechanism …
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Riparian resilience in the face of interacting disturbances: understanding complex interactions between wildfire, erosion, and beaver (Castor canadensis) in grazed dryland riparian systems of low order streams in North Central Washington State, USA
… near extirpation of a keystone riparian species, Castor canadensis (North American beaver). However, increasing frequency of large-scale wildfires and climate change driven weather is altering the severity and scale of riparian disturbance, often shifting highly impacted streams to a stable …
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Density Model Corrections Derived from Orbit Data to Characterize Upper Atmospheric Density Variations
… densities by comparing results for the ANDE Castor satellite to results for the CHAMP and GRACE satellites for the same time periods. The density correction factors and standard deviations comparing the baseline model densities to the derived atmospheric densities are also examined for the …
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Determination of thermal conductivity of food materials using a bead thermistor
… also discovered. Standardization with water and castor oil resulted in a more accurate method than was achieved using water, castor oil, and glycerin. The minimum particle diameter necessary to maintain the infinite boundary condition assumption required by heat transfer theory was found to be >5 …
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Structure and Biosynthesis of the Diterpene Hydrocarbon, Casbene
… was defined in the castor bean plant (Ricinus communis L.,) by resolving the four stereochemical ambiguities in the cyclization. The stereochemical course of the cyclization is defined as follows: (1) the re face of the C-14 carbon of GGOPP is attacked by the C-1 …
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Development of folding three-wheeled wheelchair frame for the Developing World
… which has a long wheel base and third castor wheel in front of the chair. These wheelchairs perform better in the rough terrain of the developing world, but do not have a folding frame, and thus cannot be transported. This severely diminishes the ability of the wheelchair's user to …
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Clear, Aqueous Topical Nanomicelle Formulation For Diabetic Macula Edema
… combination of nonionic surfactant hydrogenated castor oil (HCO) and octoxynol-40 (Oc-40). A design of experiment (DOE) with JMP software was performed to optimize the formulation to delineate the effects of drug-polymer interactions. In this study, the amount of polymers HCO and OC-40 as …
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