Browsing Theses & Dissertations by Title
Now showing items 582-601 of 4062
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Comparison of the macroinvertebrates communities in areas covered and devoid of the floating fern Salvinia spp. in Boquerón Wildlife Refuge (BWR) at Cabo Rojo, Puerto Rico
(2015)Mangrove forests are recognized as highly productive ecosystems; nevertheless, their ecological values, biota, and food webs are complex and yet to be understood. Scientific publications and information on aquatic invertebrates ... -
A comparison of the reproductive efficiency of Senepol, and Charbray crossed cows and the pre-weaning growth of their progeny
(2019-07-10)Senepol and Senepol crossbred genotypes have become some of the main beef cattle used in Puerto Rico. However, few studies have evaluated their reproductive efficiency on the island and their merit in breeding programs. ... -
Competencia inter-específica entre el pasto invasor Paspalum fasciculatum y cuatro especies de gramínea comúnmente utilizadas en sistemas de pastoreo en Puerto Rico
(2018)Grasses play an important role in the proper functioning of terrestrial ecosystems, as well as worldwide economic systems. Within these systems, the production of high quality forages for the nourishment and support of ... -
Competitive ability of an epilithic moss, Thuidium tomentosum Schimp., under different light treatments in a subtropical lower montane forest in Puerto Rico
(2007)Bryophyte competition in tropical vegetation has been considered a weak shaping drive in the assembly of the communities. Studies on tropical bryophytes considered that changes in species composition are originated mainly ... -
Complexity measures: The case of engineering undergraduate education
(2017)This work investigated the relevance and impact of complexity in Project-based learning (PBL) for engineering undergraduate education. Interviews were conducted with engineering professors to evaluate weather complexity ... -
Componentes claves en el desarrollo de la gerencia en Puerto Rico
(2008)Se realizó un estudio de naturaleza descriptiva, tomando como base una investigación realizada en Australia (Hunt, 2006), sobre los principales componentes en el desarrollo de la gerencia alta. Los mismos, se investigaron ... -
Componentes principales supervisados para clasificación de datos de expresión genética
(2005)The gene expression data obtained through the technology of microarrays are characterized by its considerably greater amount of features in comparison to the number of observations. The direct use of traditional statistics ... -
Componentes principales y regresión logística: analizando el rendimiento académico de los estudiantes en matemática prebásica
(2011-05)In this research we analyze the factors associated with the academic performance of students in the course of Pre-Basic Mathematics (I semester 2010-2011), from the information obtained through three questionnaires, applied ... -
Comportamiento alimentario y de Oviposición de Diaprepes abbreviatus (L.) (Coleoptera: curculionidae) para el cultivo del melocotón Prunus persica (L.) Batsch. en Puerto Rico
(2004)Diaprepes abbreviatus (L.) is an insect pest of numerous crops, including citrus, ornamentals, vegetables and others. In the present study, feeding and oviposition no-choice and choice tests were performed to evaluate the ... -
Comportamiento de puentes típicos sujetos a explosiones causadas por ataques terroristas y determinación de su capacidad para soportar cargas después de la explosión
(2010-05)En esta investigación se modelaron diferentes tipos de puentes, usados típicamente en los Estados Unidos y algunos puentes representativos de Irak, utilizando modelos de puentes de tramos cortos de hormigón reforzado, hasta ... -
Comportamiento de tanques de almacenamiento de petróleo en presencia de fuego
(2011)This thesis presents the analysis of the structural behavior of steel oil storage tanks exposed to fire. This study focuses on determining the deformed configurations and the critical buckling temperatures of storage tanks ... -
Comportamiento estructural de edificios industriales típicos propiedad de PRIDCO sujeto a cargas de viento y terremoto
(2015)Typical industrial buildings owned by PRIDCO are used by various industries and are located all over the island of Puerto Rico. Many of them were abandoned and are in the process of deterioration. The government of Puerto ... -
Comportamiento mecánico de tubos de material compuesto rellenos de hormigón bajo carga axial en compresión
(2007)Los tubos de polímero fibro-reforzado (FRP) rellenos de hormigón constituyen una alternativa eficiente para la construcción de elementos de soporte estructural. Para ser utilizados con un nivel adecuado de confianza, estos ... -
Composición botánica y química de asociaciones de Sorgo Forrajero y Leguminosas anuales
(2009)The use of legumes and grass association represents a sustainable alternative for ruminant nutrition in the tropics. An experiment was conducted at the Isabela Sub-station of the Agricultural Experimental Station, Puerto ... -
Composición de tardígrados en el musgo Caymperes palisotti Schwaegrichen sobre seis forofitos (árboles) en la Universidad de Puerto Rico, Recinto de Mayagüez
(2003)The influence of the phorophytes (trees) Bucida buceras (ucar), Calophyllum brasiliense (Maria tree), Hymenaea courbaril (locust), Mangifera indica (Mango), Veitchia merrillii (palma Manila) , and Swietenia macrophylla ... -
Composición química y características fermentativas de ensilaje de cuatro variedades comerciales de sorgo forrajero en un suelo vertisol en Puerto Rico.
(2013)An evaluating of four different varieties of commercial Sorghum compared with the Mayorbela corn. Three of the sorghum varieties evaluated contained the bmr (triunfo, pampa verde, and centurion) gene, and one did not possess ... -
Composición y abundancia de las algas bénticas de cinco sistemas lóticos de Puerto Rico
(2007)Benthic algal communities are often the dominant primary producers and important energy source o higher trophic levels in rivers and streams. The composition and abundance of benthic algae and relationships with ... -
Composición y estructura de la fauna de escarabajos (Insecta: Coleoptera) en los remanentes de bosque del Recinto Universitario de Mayagüez, Puerto Rico, con énfasis en la superfamilia Scarabaeoidea.
(2007)The objective of this work was to determine the composition and structure of families from the order Coleoptera and species of the superfamily Scarabaeoidea in fragments of secondary forests. The study was conducted on ... -
Composition- and size-controlled synthesis of Mn-Zn ferrite nanocrystals for potential magnetocaloric applications
(2008)There are presently many applications using nanofluids in thermal engineering. Some examples include the use of nanoparticles in conventional coolants to enhance heat transfer rate by increasing its thermal conductivity. ... -
Composition-structure and size/shape-controlled synthesis and characterization of high coercivity ferrite nanocrystals
(2010)Cobalt ferrite (CoFe2O4) possesses excellent chemical stability, good mechanical hardness and a large positive first order magnetocrystalline anisotropy constant, making it a promising candidate for magneto-optical recording ...