Browsing Theses & Dissertations by Title
Now showing items 1602-1621 of 3312
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Habitat characteristics as determinants of shelf edge fish communities, with emphasis on Scarid populations, off La Parguera, PR
(2010)Shelf edge reefs provide valuable habitat to a wide variety of marine organisms. Yet, because of their depth and highly sloping bottom these areas are not understood with respect to fish habitat relationships and even ... -
Habitat characterization for the Puerto Rican Crested Toad (Peltophryne [Bufo] lemur) at Guánica State Forest, Puerto Rico
(2006)The endemic Puerto Rican Crested Toad (Peltophryne [Bufo] lemur) is endangered with extinction with only one remaining population located at Guánica State Forest. Habitat associated with toad observations was characterized ... -
Hablando de presencia en sus propias palabras: Un estudio de caso sobre la presencia y el aprendizaje en cursos graduados en línea desde la perspectiva del estudiante
(2021-05-01)La transición de una modalidad presencial (face to face) a una modalidad a distancia, específicamente en línea, conlleva una alteración considerable de los procesos administrativos y educativos de las instituciones de ... -
Hacia el establecimiento y desarrollo del Centro de Documentación e Investigación Pablo Casals
(2011-12-12)Pablo Casals, violonchelista catalán de renombre internacional, se radicó en Puerto Rico, la patria de su madre, desde 1955 hasta su muerte en 1973. Bajo su gestión se fundaron tanto el Festival Casals como la Orquesta ... -
Hacia un liderazgo educativo efectivo en el contexto de cooperativas juveniles escolares en Puerto Rico
(2020-05-12)Esta investigación es un estudio de caso instrumental en torno a 12 cooperativas juveniles escolares en Puerto Rico: siete activas y cinco inactivas. Al abordar el problema de investigación, se exploró porqué hay cooperativas ... -
Hacia una fisio-psicología de la voluntad : pensamientos, sentimientos y afectos en Más allá del bien y del mal 19
(2019-05-06)El objetivo de esta investigación es demostrar que en la filosofía de Nietzsche la noción de voluntad — principio de acción moral en la filosofía — no posee una dimensión metafísica como sostiene Martin Heidegger, sino que ... -
Haplogroup frequencies of Y chromosomes with the 92R7T allele in Puerto Rico.
(2007)For over two decades, Y chromosome polymorphisms have successfully been used as lineage markers in evolutionary studies to determine human origins, migrations waves, and admixture. Determining the frequency and ... -
Hardware implementation of time frequency tools for power quality applications
(2007)This work deals with the analysis, design, and implementation of efficient algorithms for time-frequency signal analysis. We propose the design and development of an integrated hardware system for the automated processing ... -
Hábitat estructural nocturno y fidelidad al dormidero en Anolis cristatellus y Anolis krugi
(2008)How and where Anolis lizards sleep may indicate strategies used to avoid predators during nocturnal inactivity. I surveyed two sites: the first, Anolis cristatellus in simpatry with A. krugi for a total of 69 nights, and ... -
Heat and mass transfer effects in air-cooled vertical tube absorbers
(2007)Most of the models to predict the heat and mass transfer in vertical absorption chillers underestimate the heat and mass transfer coefficients. Generally the models put too many constraints such as: laminar profile, constant ... -
Heat transfer in turbulent channel flow with roughness on the walls: numerical simulation
(2011-12)Reynolds Average Navier Stokes (RANS) simulations are performed to study a turbulent channel flow with different roughness on the lower and upper walls. Several roughness were used. Square Bars, V-shaped and segmented ... -
Hemoglobin I from Lucina pectinata: A model for hydrogen sulfide reactivity within hemeproteins
(2009)The hemoglobin I (HbI) from the clam Lucina pectinata is an intriguing hemeprotein that binds and transports H2S to chemoautotrophic bacteria to maintain a symbiotic relationship and to protect the mollusk from H2S toxicity. ... -
Here comes the Sunn: A comprehensive analysis of the cover crop sunn hemp (Crotalaria juncea L.) and its potential for seed production and weed control in Puerto Rican agricultural systems
(2010)The cover crop Crotalaria juncea L. has been recognized for its high biomass production, nitrogen-fixation, and allelopathic properties. However, extensive studies have not been conducted to assess the behavior of different ... -
Herencia de la resistencia a papaya ringspot virus-w en cultivares tropicales de calabaza (Cucurbita Moschata)
(2010)El Papaya ringspot virus, cepa de sandía (PRSV-W), es una de las enfermedades más limitantes en la producción de calabaza (Cucurbita moschata Duchesne). Se ha reportado que el cultivar ‘Nigerian Local’ (NL), proveniente ...