Browsing Theses & Dissertations by Title
Now showing items 1667-1686 of 2526
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Nanofabrication of metal/polymer structures for surface enhanced Raman spectroscopy based biosensing
(2009-12)Raman spectroscopy is a powerful tool for detection because the Raman spectra yields information about the molecular structure of a given analyte and the technique is commonly used as a molecular fingerprint. However the ... -
Nanopore sequencing for the metagenomic analysis of the gut microbiota of the millipede Anadenobolus monilicornis
(2019-05-07)Millipedes act as important components of leaf litter decomposition in terrestrial ecosystems, thanks in part to the microbial diversity in their guts. However, millipedes and their gut microbiota are understudied, compared ... -
Nanostructured bimetallic copper-gallium catalysts for the production of methanol from carbon dioxide
(2018-12-12)The hydrogenation of carbon dioxide (CO2) to methanol is an alternative to mitigate the problems caused by global warming. Industrially, methanol is produced by hydrogenation of CO2/CO over heterogeneous catalyst Cu/ZnO/Al2O3. ... -
Natural rock drainage associated with unmined porphyry copper deposits in the Río Grande de Arecibo watershed, Puerto Rico
(2005)The Río Grande de Arecibo is located at the north-central part of the island of Puerto Rico; its watershed is unique because it contains most of the discovered porphyry copper deposits of Puerto Rico. Several of them were ... -
Natural-convection heat transfer in supercritical fluids
(2004)The main objective of this study is to calculate the heat-transfer coefficients for natural convection from a heated, vertical flat plate into a supercritical fluid. In the first part of this work, an equation for the ... -
Naturalistic learning of Spanish in Puerto Rico: Linguistic landscape, motivation, and identity of self through cultural expression and practices
(2018)The objective of this thesis is to examine the individual differences of eight L1 English speakers learning L2 Spanish naturalistically in Puerto Rico (PR) both as a group and as individuals. Through the use of voice-recorded ... -
Nature and evolution of a soil toposequence at coloso valley agricultural reserve
(2018)Soil physical, chemical and mineralogical properties of four profiles in a Rio Piedras-Bajura toposequence at Coloso Valley Agricultural Reserve were evaluated to theorize about the nature and evolution of these soil ... -
A navigation system for free descent-ascent autonomous underwater vehicles
(2017-05)Free vehicles are buoyant platforms designed to freely descend through the water column when ballasted. A free vehicle gathers samples from the water column or the ocean bed. Once done sampling, the vehicle releases its ... -
Near infrared spectroscopic transmission measurements for pharmaceutical powder mixtures and theory of sampling (TOS) applied in pharmaceutical industry quality control (Qc) practices
(2015)This thesis presents two projects that involve the implementation of near infrared spectroscopy. NIR spectroscopy is a fast and non-destructive spectroscopy that in combination with multivariate analysis is a very useful ... -
Necesidad de capacitación del maestro de educación agrícola de las regiones de Mayagüez, Ponce y San Germán en el área de educación especial
(2007)The increase of exceptional children in the classroom has generated preoccupation with respect to the capacity of the teacher of Agricultural Education. This descriptive - correlacional study described the capacities ... -
Necesidades de orientación y adiestramiento en el uso de equipo de protección personal en fincas de producción de plátanos en municipios de la región noroeste de Puerto Rico
(2010)The objective of this study was to determine the needs of orientation and training in the use of Personal Protection Equipment (PPE) in farms dedicated to plantain production in municipalities of the northwest region of ... -
Nemátodos entomopatógenos y hongos del suelo con potencial antagónico a nemátodos entomopatógenos asociados a cítricas
(2009)The use of entomopathogenic nematodes (EPN) to control insect pests in the soil is a common practice. The objectives of this investigation were to characterize the communities of EPN associated with citrus cultivation, ... -
A neocortex-based model for pattern recognition
(2014)The information society needs to process massive volumes of data in automated ways. The data is more meaningful if it is considered as sequences of patterns rather than isolated patterns. A trained human brain has outstanding ... -
NESA neighborhood emergency support application
(2013)Weather inclement and natural disasters, such as hurricanes, tornados, earthquakes and fires, can affect communities adversely and people might suffer damages on their homes and goods. As a result, countless situations and ... -
Net-plankton diatoms of Puerto Rican water reservoirs as potential bioindicators of trophic status
(2014)Diatoms are a group of unicellular algae enclosed in a siliceous exoskeleton called the frustule. This ornamented structure allows for taxonomic identification. Diatoms are frequently used as indicators to monitor the ... -
A network simulator based on ospf routing protocol for network design and educational purposes
(2007)Computer simulation is the tool of choice for developing and testing new technologies and techniques. It is also commonly used to help teach and train students and other professionals. The Masters project done is a network ... -
A neural network approach to predict hurricane intensity in the North Atlantic basin
(2004)Upper air information and artificial neural networks (ANN) are used to predict hurricane intensity in the North Atlantic basin. Competitive neural network is used to identify analog storms to the current hurricane. Once ... -
A neural networks method to predict activity coefficients for binary systems based on molecular functional group contribution
(2006)Artificial neural network (ANN) techniques and functional group contributions were used to develop an algorithm to predict chemical activity coefficients. The ANN algorithm was trained using experimental ... -
A new cloud classification system for rainfall detection over puerto rico using remotely sensed data
(2011)A new rainfall detection algorithm was developed to overcome challenges algorithms like the operational NOAA/NESDIS Hydro-Estimator (HE) present over Puerto Rico when detecting rainfall. The HE, a brightness temperature ... -
New constraints on crustal deformation within the Puerto Rico-Virgin Islands microplate using two decades of GPS data
(2019-05-14)Observations from Global Positioning System (GPS) along the northeastern region of the Caribbean Plate Boundary Zone have been used to evaluate crustal deformation in the Puerto Rico and Virgin Islands (PRVI) microplate ...