Now showing items 1-20 of 984

    • 1D and 2D Hydraulic Modeling to Estimate Bridge Scour: A Case Study 

      García-Santiago, Kettsy (Polytechnic University of Puerto Rico, 2021)
      Scour is the effect of erosion of soil surrounding a bridge foundation due to fast-flowing water. This dynamic phenomenon can be categorized as the most common cause of bridge failures. Therefore, scour depth at piers and ...
    • The 2017-2018 Evaluation of the National Operational Excellence Index in Puerto Rico 

      Camacho Cruz, Natali A. (Polytechnic University of Puerto Rico, 2019-08-19)
      Puerto Rico has not participated in the evaluation of the World Forum Competitive Index (WFCI) since 2015; consequently, the Puerto Rico Manufacturers Association (PRMA) created an index to measure productivity on a ...
    • 3D Printing of Biopolymer Composites Fabricated from Polylactic Acid & Eggshell Derived Hydroxyapatite 

      Valentín Arboleda, Paula A. (Polytechnic University of Puerto Rico, 2021-09-17)
      Hydroxyapatite ( is a naturally occurring mineral form of calcium apatite, which is found in 65 70 of human bones Waste derived HAp is attracting considerable attention due to its excellent biocompatibility and capacity ...
    • 3D Printing of Conductive Urinary Catheters and their Applications in Electro-Therapies to Overcome Antibiotic Resistance of Bacterial Biofilms 

      Cué Royo, Camila S.; González Arce, Leira K. (Polytechnic University of Puerto Rico, 2021-09-17)
      Today, antibiotic-resistant bacteria represent a global health challenge, especially for the control of catheter-associated urinal tract infections (CAUTI). Conventional antibacterial treatment for CAUTI requires a high ...
    • 3D Vibration Isolation Systems Modeling for Air Handling Units 

      Aponte Rivera, Alfredo (Polytechnic University of Puerto Rico, 2014)
      Spring isolators systems are commonly used in a variety of ways in today’s construction industry. They are an essential part of the design of many mechanical systems that are in need of absorbing and dissipating unwanted ...
    • 49 

      Martínez, Jan (Polytechnic University of Puerto Rico, 2018)
      Poesía: ¿Cuándo te dijeron sé Qué sentiste mientras te ungías, Mientras te tragabas el celeste De todos los universos? ¿Qué hiciste cuándo te llegó el azul, La rosa de los vientos, la estrella polar, El astro para ...
    • 5s Techniques to Optimize Classroom Organization 

      Moreno López, Stephanie L. (Polytechnic University of Puerto Rico, 2020)
      This research project was focused in the 5s methodology for the improvement of an elementary classroom. The 5s is defined as a method of five steps that seeks to improve working space, eliminate waste and improve ...
    • Acerca de “La virgen de los boleros” 

      Rabelo, José (Polytechnic University of Puerto Rico, 2016)
      La virgen de los boleros (Isla Negra, 2015) es la nueva colección de cuentos del escritor puertorriqueño, radicado en California, Jorge Luis Castillo. La variedad de temáticas, personajes y situaciones enriquecen el ...
    • Aero Repairs Documentation Cycle Time Reduction By Lean Application 

      Negrón Rivera, David A. (Polytechnic University of Puerto Rico, 2014)
      In our daily life and world, with a diversity of industries and services, from health to manufacturing, all kind of products; many of them care apply Lean concepts or tools to perform important improvements to their ...
    • Aircraft Wing Spanwise Air-Load Distribution using MATLAB 

      Holguino Borda, Jonathan (Polytechnic University of Puerto Rico, 2014)
      Aircraft design is a complex task that involves the interaction between aerodynamics, propulsion, flight mechanics and structures. In particular, the structural design tasks involve the consideration of a significant ...
    • Airfoil Design Using Blade Element Momentum Theory 

      Lobeto Sanfeliz, Rodrigo (Polytechnic University of Puerto Rico, 2015)
      A wind turbine is a device designed to extract kinetic energy from the wind and convert it to mechanical energy, which in turn can be equivalent to electric power. On this work we will focus on the aerodynamics of wind ...
    • Algorithm for User-friendly Password Policy 

      Hernández Liang, Jorge (Polytechnic University of Puerto Rico, 2017)
      Password based security has become prevalent as the de facto measure against intrusion. Computer systems rarely focus on usability, and little research has been done to change the current, near universal method of ...
    • Alternate Raw Material Supplier Validation 

      Valerín Díaz, Melissa (Polytechnic University of Puerto Rico, 2019)
      This article discusses the Process Validation of Over the Counter Pharmaceutical Product using alternate supplier of raw material. The primary ibuprofen drug substance supplier for GSK Ibuprofen family products informed ...
    • Alternativas para el Uso de Cenizas Volantes en Mezclas de Hormigón 

      Espiña Sánchez, Leonardo (Polytechnic University of Puerto Rico, 2015)
      Estudios demuestran que las cenizas volantes de carbón se pueden utilizar como uno de los componentes para la fabricación de estructuras de hormigón. Este proyecto pretende corroborar si las cenizas volantes de carbón ...
    • Alternatives for Processing Plastics with Recycle Codes from 3 to 7 

      Cuevas Colón, Bianka J. (Polytechnic University of Puerto Rico, 2019-08-19)
      Solid waste management represents a challenge for Puerto Rico. According to the Department of Natural and Environmental Resources (2019), more than half of the landfills have a closure order and only type one and two ...
    • American Sign Language Recognition using Electromyographic Signals via Myo Armband 

      Ramos González, Héctor A.; Vega, Anthony (Polytechnic University of Puerto Rico, 2018)
      Human and computer interaction has become an important tool in the 21 st century One of the most promising technologies for human/computer interaction is speech recognition ( which is a system composed of microphones, ...
    • Analysis & Evaluation of Costa Linda Condominium Applying New Codes for to Determine Retrofit Requirements for Stability 

      Jordan Marrero, Jorge M. (Polytechnic University of Puerto Rico, 2017)
      This study evaluate the capacity of a 10-story existing building designed in 1972 to determine its capacity to resist new loads according with present codes. A structural model was developed using a modern engineering ...
    • Analysis and Application of Maxwell's Equation for Induction Heating 

      Vázquez Ruiz, Eduardo (Polytechnic University of Puerto Rico, 2013)
      This article involves the development of the Maxwell equations considering a induction heating system. It is analyzed by computer program "Ansys Maxwell," to observe the development of the magnetic field. The system ...
    • Analysis and Characterization of the Condenser of a Small Scale Solar Air Conditioning Unit 

      Fuentes Meléndez, José A. (Polytechnic University of Puerto Rico, 2012)
      Abstract - This work is intended to show the characterization of a flat plate heat exchanger used as the condenser of a small scale solar air conditioning system and the recommendations for future studies. Also show flat ...
    • Analysis and Design of a Reinforced Concrete Multistory Office Building 

      Dávila González, Laureano (Polytechnic University of Puerto Rico, 2012)
      Abstract - The objective of this project is to analyze and design an existing old structure using actual codes and specifications, locating the structure in a seismic risk zone. This project performs a load analysis of the ...