The Polytechnic University of Puerto Rico —commonly referred as Poly or La Poly in Spanish— is a private non-profit university located in San Juan, Puerto Rico. PUPR offers a broad range of technical degrees; specializing in engineering professions. Wikipedia.
Xu K.,University of Texas at Austin |
Zhu P.,University of Texas at Austin |
Colon T.,Polytechnic University of Puerto Rico |
Huh C.,University of Texas at Austin |
Balhoff M.,University of Texas at Austin
SPE Journal | Year: 2017
Injecting oil-in-water (O/W) emulsions stabilized with nanoparticles (NPs) or surfactants is a promising option for enhanced oil recovery (EOR) in harsh-condition reservoirs. Stability and rheology of the flowing emulsion in porous media are key factors for the effectiveness of the EOR method. The objective of this study is to use microfluidics to (1) quantitatively evaluate the synergistic effect of surfactants and NPs on emulsion dynamic stability and how NPs affect the emulsion properties, and to (2) investigate how emulsion properties affect the sweep performance in emulsion flooding. A microfluidic device with well-defined channel geometry of a high-permeability pathway and multiple parallel low-permeability pathways was created to represent a fracture/matrix dual-permeability system. Measurement of droplet coalescence frequency during flow is used to quantify the dynamic stability of emulsions. An NP aqueous suspension (2 wt%) shows excellent ability to stabilize the macro-emulsion when mixed with a trace amount of surfactant (0.05 wt%), revealing a synergistic effect between NPs and surfactant. For a stable emulsion, when a pore throat is present in the high-permeability pathway, it was observed that flowing emulsion droplets compress each other and then block the high-permeability pathway at a throat structure, which forces the wetting phase into low-permeability pathways. Droplet size shows little correlation with this blocking effect. Water content was observed to be much higher in the low-permeability pathways than in the high-permeability pathways, indicating different emulsion texture and viscosity in channels of different sizes. Consequently, the assumption of bulk emulsion viscosity in the porous medium is not applicable in the description and modeling of the emulsion-flooding process. Flow of emulsions stabilized by an NP/surfactant mixture shows droplet packing in high-permeability regions that is denser than those stabilized by surfactant only, at high-permeability regions, which is attributed to the enhanced interaction between droplets caused by NPs in the thin liquid film between neighboring oil/water (O/W) interfaces. This effect is shown to enhance the performance of emulsion-blockage effect for sweep-efficiency improvement, showing the advantage of NPs as an emulsion stabilizer during an emulsion-based EOR process. Copyright © 2017 Society of Petroleum Engineers.
Torres A.M.,University of Castilla - La Mancha |
Mateo-Sotos J.,University of Castilla - La Mancha |
Vicente L.M.,Polytechnic University of Puerto Rico
Circuits, Systems, and Signal Processing | Year: 2017
Spherical harmonic array processing, also known as phase mode spherical sensor array processing, has been recently studied for different communication purposes. The spherical array arrangement presents desired three-dimensional symmetry, while the phase modes provide frequency-independent spatial processing. This paper proposes two novel sensor arrangements for spherical array which have been compared with the three sensor arrangements most used in spherical array beamforming. It has been proven that these proposed arrays achieve high directivity and more symmetrical beampatterns compared to the other arrangements. The phase mode beamformer with the element space beamformer has also been analyzed in an acoustic field. Furthermore, the phase mode beamformer has been compared when using the proposed sensor arrangements where different simulations show that the phase mode beamformer, at low frequencies, suffers of a huge reduction in array gain compared to that of the element space beamformer. © 2016, Springer Science+Business Media New York.
News Article | November 1, 2016
When Richard Marzan opened House Doctors in the fall of 2015, it was because he saw an opportunity to meet two needs: he wanted to begin a new career after retiring from the Army and the community needed a trustworthy, professional handyman service. Now Rich and his team are thrilled to celebrate the one-year anniversary of House Doctors of McLean. “The first year of a new business is always a building year and we’ve done that. Now, with a solid foundation, we are moving forward with plenty of lessons learned and a bright future. We exceeded all expectations and we’re receiving strong community support – I’m very excited about year two,” Rich said. House Doctors of McLean offers professional handyman services in Dunn Loring, Falls Church, Great Falls, McLean, Arlington, Oakton, Tysons and Vienna as well as the surrounding areas. The team at House Doctors is focused on professionalism, service excellence and quality workmanship. Their goal is to make home improvements easier for their customers by being on time, doing the job right and offering a one year workmanship guarantee. Rich Marzan, a retired Lieutenant Colonel, served in the United States Army for more than 27 years. He is an ROTC Distinguished Military Graduate and a 1995 graduate of the Armor Officer Basic Course at Fort Knox, KY. Marzan earned his Bachelor’s degree in Industrial Management from the Polytechnic University of Puerto Rico and his Master’s degree in Administration from Central Michigan University. He is also a graduate from the Captains Career Course and the United States Army Command and General Staff College. Rich Marzan’s awards and decorations include the Defense Meritorious Service Medal, Meritorious Service Medal, Iraq and Afghanistan Campaign Medals, Humanitarian Service Medal, NATO Medal, and the Parachutist and Rigger Badge. “I retired from the military in 2015 and I didn’t want to transition into an office job or government contracting work. With the help of the Army Retirement Services, I met with a business coach who opened my eyes to franchising. When I talked to the folks at House Doctors, I knew this business would be a good fit for me and for the region I call home,” Rich said. “House Doctors is a professional handyman service and that means any repair we do will be done right. You won’t be disappointed in our high quality work and, if there are ever any concerns, we are a local company and we are here to help.” House Doctors’ experienced, insured, background checked and uniformed handymen technicians specialize in projects that take two hours to two days to complete, such as light remodeling and repairs of decks, doors, bathrooms and kitchens; repairing drywall; painting; exterior repairs; making home modifications and much more. In addition to using lessons learned to make the second year of business even stronger, Rich is currently working with the House Doctors franchising team to expand his service area into Maryland. “We have an incredible, hardworking team and I know people outside our current service area could use our expertise. Hopefully, we will be serving the people of Maryland before Thanksgiving,” Rich said. For more information about House Doctors of McLean or for an estimate on your project, call (703)639-0391, email HD535(at)HouseDoctors.com or visit http://housedoctors.com/handyman-mclean/. House Doctors Handyman Service has been helping homeowners across the United States with home repair and light remodeling projects for more than 20 years. Our friendly, insured and bonded craftsmen are scheduled to be there on time and are committed to complete customer satisfaction. Each of our technicians are experienced in home maintenance, product installations and a variety of home improvements. We’re so confident in our team and products that every job we perform comes with a one-year guarantee.
Deschapelles B.,Polytechnic University of Puerto Rico
Journal of Structural Engineering | Year: 2011
The analysis of thin-walled structures has been discussed by many theoreticians who produced seminal works. Unfortunately, these studies are based on mathematical formulations which are not easy to understand by the majority of engineers because the background provided by the undergraduate schools does not cover the solution of complex differential equations or the use of area coordinates in the calculation of cross-section properties. Accordingly, practicing engineers are often at a loss in problems involving nonlinear differential equations or the meaning of an elusive mechanical action called bimoment in the evaluation of longitudinal stresses caused by warping torsion. On the other hand, present day formulations should take advantage of the availability of computers that can easily handle the matrix relations on which the finite element analysis is based. This work presents a new finite element that allows the evasion of the aforementioned complexities. The main novelty is the discussion of a nonnodal degree of freedom that efficiently captures the possible shear flow along the longitudinal edges of a beam-column element. © 2011 American Society of Civil Engineers.
Torres A.M.,University of Castilla - La Mancha |
Mateo J.,University of Castilla - La Mancha |
Vicente L.M.,Polytechnic University of Puerto Rico
Multidimensional Systems and Signal Processing | Year: 2016
This research proposes an improved narrowband partial adaptive beamformer analysis using a proposed spherical array. Comparison between the fully and the partial adaptive beamformers is given. The study is performed by investigating performance parameters like the beamformer output signal-to-noise ratio and the beamformer output signal-to-interference-plus-noise ratio both in the steady state and along adaptation. Furthermore, computational complexity and convergence speed of the proposed sensor arrangement are also analyzed and examples are given. The results demonstrate that this beamformer considerably reduces the number of complex operations and features faster convergence speed. © 2016 Springer Science+Business Media New York
Geigel A.,Polytechnic University of Puerto Rico
Journal of Computer Security | Year: 2013
This paper presents a proof of concept of a neural network Trojan. The neural network Trojan consists of a neural network that has been trained with a compromised dataset and modified code. The Trojan implementation is carried out by insertion of a malicious payload encoded into the weights alongside with the data of the intended application. The neural Trojan is specifically designed so that when a specific entry is fed into the trained neural network, it triggers the interpretation of the data as payload. The paper presents a background on which this attack is based and provides the assumptions that make the attack possible. Two embodiments of the attack are presented consisting of a basic backpropagation network and a Neural Network Trojan with Sequence Processing Connections (NNTSPC). The two alternatives are used depending on the underlying circumstances on which the compromise is launched. Experimental results are carried out with synthetic as well as a chosen existing binary payload. Practical issues of the attack are also discussed, as well as a discussion on detection techniques. © 2013-IOS Press and the authors. All rights reserved.
Jordan-Conde Z.,Polytechnic University of Puerto Rico |
Mennecke B.,Iowa State University |
Townsend A.,Iowa State University
Computers in Human Behavior | Year: 2014
During the last decade, online social networks such as Facebook™ (Facebook) grew rapidly in popularity and this was due in no small measure to use of these media by adolescents. For many teenagers and young adults, Facebook represents a social institution that can be used by adolescents not only for sharing basic information and for connecting with others, but also as a platform for exploring and divulging information about their identities. To examine issues related to questions about the formation and disclosure of identity-related information by late adolescents, this study investigates the relationship between disclosures of intimate information by late adolescents through Facebook and their stage of psychosocial development. To examine disclosure behaviors of young college students on Facebook, we conducted focus groups in conjunction with a content analysis of Facebook profiles. Findings point to an extended adolescence period resting on the identity construction dilemma posed by digital social networks. © 2013 Elsevier Ltd. All rights reserved.
Perez A.,Polytechnic University of Puerto Rico
IEEE Robotics and Automation Magazine | Year: 2010
The various ways of successfully presenting the research at conferences and competitions are presented. Modern engineers are expected to develop advanced social, communication, presentation, and leadership skills. One must be dare to share the visions about one's research with the community without boosting one's work too much. Well-experienced professionals look for students with concrete perspectives who share a sophisticated view of the field's future. Humility and a good collaborative attitude are crucial to one's success as an engineer. Making sure that one is familiar with the room, the projector, the remote, and the pointer. Presenting one's work with a good and humble attitude at conferences has been the single thing that has opened the most career paths for individuals.
Rodriguez B.,Polytechnic University of Puerto Rico |
Kalathur H.,University of Wisconsin - Madison |
Lakes R.,University of Wisconsin - Madison
Physica Status Solidi (B) Basic Research | Year: 2014
Lattice structures based on bimorph rib elements are fabricated and studied experimentally. The effective piezoelectric sensitivity d is observed to be much larger, by a factor of at least 10 000, in magnitude than that of material comprising the lattice ribs. Bending of the ribs in response to input voltage is responsible for the large sensitivity. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Agency: NSF | Branch: Continuing grant | Program: | Phase: FED CYBER SERV: SCHLAR FOR SER | Award Amount: 824.91K | Year: 2016
This proposal will inaugurate a CyberCorps®: Scholarship for Service (SFS) program at the Polytechnic University of Puerto Rico (PUPR), the second largest Hispanic Higher Education Institution in the USA, serving around 5,000 students in the areas of Engineering, Computer Science, Architecture, and Business Administration. Since its inception, the Institution has graduated approximately 6,000 Hispanic engineers and surveyors. The main goals of the proposed project are: 1) Successfully implement an SFS graduate program to increase research and improve education in technology areas relevant to cybersecurity; 2) Engage students in professional activities such as internships, workshops, outreach, and other SFS-sponsored activities. 3) Increase the number of qualified students entering the fields of information assurance and cyber security to protect and defend the cyberspace. Students will be selected from private and public universities from Puerto Rico and the selected scholars will participate in meaningful summer internships.
The project intends to provide life-changing cybersecurity education to the selected students and to help them lunch life-long cybersecurity professional careers. The project will continue previous efforts to substantially increase the number of women and minorities prepared for graduate studies and careers in Cybersecurity; and will help to alleviate the nationwide shortage of qualified professionals in these areas. Students will be involved in research projects, teamwork and professional development. Research results and thesis of SFS scholars will be disseminated in Cybersecurity journals and conferences, and will also be available through the PUPR web page.