• Two new species of <em>Toxonotus</em> Lacordaire, 1866 (Coleoptera: Anthribidae: Platystomini) from Puerto Rico and adjacent islands 

  Heinemann, Lance (2021-07-09)

  Species in the genus <em>Toxonotus</em> (Lacordaire, 1866) are described for the first time in Puerto Rico and its jurisdictions. Two new species are described, annotated with digital images, and added to a key to the ...

• Feasibility analysis of microgrid implementation in compliance with the Puerto Rico 9028-PREB regulation 

  Rodríguez Martínez, Omar Felipe (2021-07-05)

  In power systems, the implementation of renewable energies has had a great impact and penetration due to the increase in efficiency that has been occurring over the years and the decrease in the prices of the different ...

• Effects of dam removal on fish communities in Puerto Rico streams 

  Cancel-Villamil, Johann J. (2021-07-07)

  The island of Puerto Rico has approximately 1,200 rivers and streams that total 9,187 river kilometers in 46 major drainage basins. The flow of these bodies of fresh water is interrupted by approximately 335 artificial ...

• Transmission Raman Spectrometer design for the detection of opioids, concealed chemicals, and biological threats 

  Tirado Robles, Naihomy M. (2021-07-08)

  Raman spectroscopy (RS) is an excellent tool for quantitative and qualitative analysis that can be used to detect and characterize different types of substances. Transmission Raman Spectroscopy (TRS) has been used in ...

• Influence of surface composition on functionalized gold nanoparticle adsorption to the oil/water interface 

  Capre Masó, Lucas D. (2021-07)

  The studies presented in this thesis focused on investigating the influence of surface composition on the adsorption and self-assembly of nanoparticles at the toluene/water interface, as a step towards generating knowledge ...

• Population structure and distribution of a new population of the endagered Aristida portoricensis (Poaceae) in Mayagüez, Puerto Rico 

  Del Rosario Cosme, Steven N. (2021-07)

  The genus "Aristida" (Poaceae) is a varied and well-distributed group of grass within the subfamily Aristidoideae. In Puerto Rico, we count with an endemic species, "Aristida portoricensis", commonly known as "Pelos del ...

• Characterization of planar sensors bonded to RD53A readout chip for CMS phase 2 inner tracker system 

  Guerrero Laos, Alvaro Javier (2021-06)

  The HL-LHC conditions of instantaneous peak luminosities up to 7.5x10E34 cmE2 sE-1 and an integrated luminosity of the order of 300 fE-1/year would result in 1 MeV neutron equivalent fluence of 2.3x10E16 n_eq/cmE2 and a ...

• Cartografía regional de suelos salinos y sódicos en el Valle de Lajas, suroeste de Puerto Rico 

  Castro Chacón, José Pablo (2021-07)

  Three methods of prediction and data extrapolation were developed: (i) simple and (ii) multiple linear regression models and (iii) artificial neural networks, to create regional saline and sodic soil maps from effective ...

• Evaluation of genetic diversity and resistance genes of two rust-resistant coffee varieties, Limani and Fronton 

  Badillo Chico, Paola N. (2021-06)

  Coffee was introduced in Puerto Rico in 1736 and was recognized as one of the most valuable products in the Puerto Rican economy during the 19th century. In the island, coffee production is centered in twenty-two ...

• Selective hydrodeoxygenation of biomass-derived oxygenates over heterogeneous Mo-based catalysts 

  Albarracin Suazo, Sandra Cecilia (2021-07)

  The development of catalytic pathways to produce commodity chemicals from lignocellulosic biomass is promising for substituting non-renewable fossil feedstock use. This dissertation studied the catalytic performance of ...

• Magnitud y distribución espacial de la salinidad y sodicidad del suelo a escala de campo en el Valle de Lajas, Puerto Rico 

  Álvarez Torres, Beverly (2021-06)

  Se evaluó un método alterno para estimar la salinidad y sodicidad del suelo a escala local en el Valle de Lajas, Puerto Rico. Para esto, se midió la conductividad eléctrica aparente del suelo (ECaV) utilizando el sensor ...

• El tiempo de reacción y el tiempo de movimiento en tres clasificaciones de tenistas masculinos en Puerto Rico 

  Rivera Laforet, Andrea P. (2021-06-03)

  El sistema visual tiene un rol importante en el procesamiento de información de nuestro entorno y por consiguiente en la planificación y ejecución de respuestas a ciertos estímulos. La visión deportiva es el conjunto de ...

• Synthesis and characterization of sulfonated amine block copolymer membranes for fuel cells and specialty separations applications 

  Barrios Tarazona, Karen A. (2021-07-09)

  This work focuses on the synthesis and characterization of block copolymers membranes with multi-ionic domains to analyze the effect of the morphological and chemical changes on the transport properties for their use in ...

• Development of sensitive analytical methods based on quantum cascade laser spectroscopy 

  Villanueva López, Vladimir (2021-07-09)

  Quantum cascade laser (QCL) technology has enabled the development of more sensitive analytical methods based on mid-infrared spectroscopy due to high brightness and spectral resolution. The advantages of this technology ...

• Essential adaptive protection for potential UPRM microgrid system 

  Lozano Inca, Fernando (2021-07-09)

  In response to frequent and prolonged power outages by the utility owing to lightning, hurricanes, earthquakes, including continuous faults within the University Puerto Rico at Mayag uez (UPRM) due to its outdated ...

• Tiempo de transición para una familia de sistemas dinámicos discretos no lineales 

  Rodríguez Pérez, Eiver Julio (2021-07-09)

  Un sistema dinámico discreto es una función F: X→X, donde X es un conjunto finito. Una interrogante de interés es cuánto tiempo requiere un estado en alcanzar un punto fijo, es decir, el tiempo de transición del estado. ...

• Validación del modelo de simulación para el rastreo de nutrientes (ntt) a nivel de finca en una siembra de plátano en Salinas Puerto Rico 

  Carmona Ortega, Fabián (2021-07-02)

  A field study was conducted to assess the ability of the Nutrient Tracking Tool (NTT) model to estimate N losses in a plantain (Musa spp. v. "maricongo") farm in the southern semi-arid coast of Puerto Rico. I evaluated ...

• Flavonoid-ferrocene conjugate as new treatment for breast cancer 

  Mendoza Morales, William Omar (2021-07-08)

  Research in drug development for breast cancer treatment has been crucial, since traditional treatments have been associated with neurotoxicity and nephrotoxicity. Previous studies showed that when ferrocene is combined ...

• Pickering liquid crystal emulsions: Influence of mixed-monolayer protected gold nanoparticles on colloidal stability and surfactant-induced ordering transitions 

  Zabala Rodríguez, Kevin Johan (2021-04-13)

  Liquid crystal (LC) droplets dispersed in aqueous phases (e.g., LC-in-water emulsions) provide a versatile platform for the design of droplet-based LC sensors that can respond to the presence of chemical and biological ...

• Seismic soil pressures on rigid walls subjected to pulse-like earthquake ground motions 

  Ferreris Barreto, Miguel (2021-05-11)

  Pulse-like earthquakes are believed to impose larger structural demands on structures due to the sudden release of seismic energy. This can cause concern in areas that are near fault due to the possibility of structures ...

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