Browsing Theses & Dissertations by Title
Now showing items 1265-1284 of 2526
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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 ... -
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 ... -
Herpetofaunal species composition on the Vieques National Wildlife Refuge, Vieques, Puerto Rico
(2010)The loss of biodiversity is identified as one of the biggest ecological tragedies of our time and two of the groups most affected by this loss are amphibians and reptiles. A thorough inventory and long term monitoring that ... -
Heterochronic sequence for the development of paraphyses in Neckeropsis Schimp. (Bryophyta: Neckeraceae)
(2004)Neckeropsis is a genus of tropical distribution with two species in Puerto Rico, N. disticha and N. undulata, that present leaf-like structures, the ramenta, that grow on the perichaetia after the fertilization of the ... -
HF radar wave measurements in the US Caribbean in complex sea states: Hurricane Matthew case study
(2019-09-26)Methods for resolving wave information from 2nd order backscatter with SeaSonde high-frequency radars (HFR) were assessed for the west (Mona Passage) and southeast coasts of Puerto Rico during Hurricane Matthew in 2016. A ... -
A hierarchical memory model for terrain data management in interactive terrain visualization
(2007)This work describes the use of a hierarchical memory model for the performance estimation of the interactive terrain visualization system as part of the system design process. Such visualization systems must be capable of: ... -
Hierarchy control of hybrid power system
(2007)In this thesis, we present a Hierarchical control of Hybrid Power Systems (HPS) that consist of a Wind Turbine, Photovoltaic Panels, connection to the AC utility, a Battery Bank, and a zonal model of a load. The hierarchical ... -
High energy density xLi2MnO3-(1−x)LiMn0.5Ni0.5O2 cathode system for lithium-ion rechargeable batteries
(2013)In this work xLi2MnO3-(1-x)LiNi0.5Mn0.5O2 (x = 0.3 and 0.5) layered cathode materials were synthesized by the co-precipitation route. The synthesized powders were annealed at 950 °C for 12 h in air to get the desired ... -
High frequency behavioral modeling of second-order sigma delta modulators
(2006)Sigma delta modulators (ΣΔMs) form part of the core of today’s mixed-signal de- signs. They are cornerstone components of oversampled data converters. Such data converters take advantage of digital signal processing ... -
High level expression and thermal characterization of human centrin
(2006)Human centrin 1 (Hcen 1) is an acidic calcium binding protein with a molecular mass of ~ 20 kDa and has been localized in human as well as in mouse testis, at the base of the flagellar apparatus in sperm cells. Its ... -
High precision GPS monitoring for landslide hazard and land stability evaluation in the Cerca del Cielo urbanization, Ponce, Puerto Rico
(2015)Geodetic measurements in of the Cerca del Cielo landslide indicate that the displacement is controlled by the amount of precipitation. The decrease in creep rate over the years is considered to be the result of the lower ... -
High resolution temporal patterns of black grouper, Mycteroperca bonaci, courtship bioacoustics at spawning aggregations in the greater Caribbean
(2016)Black grouper, Mycteroperca bonaci, are large protogynous hermaphrodites in the Family Epinephelidae. In the Caribbean, Gulf of Mexico and South Florida they form transient seasonal spawning aggregations in the winter ...