Time filter

Source Type

San Juan Capistrano, United States

Ramos M.,Institute Ingenieria y Tecnologia | Ramos M.,University of Texas at El Paso | Ferrer D.,University of Texas at Austin | Martinez-Soto E.,University Metropolitana | And 4 more authors.
Ultramicroscopy | Year: 2013

Hydrotreatment catalytic operations are commonly performed industrially by layered molybdenum sulfide promoted by cobalt or nickel in order to remove heteroelements (S, N, O) from fossil fuels and biofuels. Indeed, these heteroelements are responsible of the emission of pollutants when these fuels are used in vehicles. In this respect, previous studies made by our research group have shown that the active phase under steady state conditions is partially carbided while strong bending effects of MoS2 slabs were also observed. However, up to now, the morphology of the resulting Co/MoSxCy carbided catalyst has not been fully characterized. In the present study, for the first time, a chemical reaction between the carbon content of a TEM Cu/C grid and a freshly sulfide Co/MoS2 catalyst was in situ observed at 300°C and 450°C by HRTEM experimental techniques at ~10nm of resolution. Results indicate that bending of MoS2 layers occurred due to carbon addition on MoS2 edge sites, as observed in stabilized catalysts after HDS reaction. Using a silicon grid, only cracks of MoS2 slabs were observed without bending effect confirming the role of structural-carbon in this change of morphology. © 2012 Elsevier B.V.

Agency: NSF | Branch: Standard Grant | Program: | Phase: ADVANCED TECH EDUCATION PROG | Award Amount: 501.82K | Year: 2010

This project establishes a partnership between the Universidad Metropolitana (UMET), the Institutos Tecnologicos de Puerto Rico (ITPR) and representatives from businesses in Puerto Rico with a need for employees with 2-year and 4-year technical degrees in instrumentation, automation and control. The project is improving the science and mathematics education on two campuses of ITPR in order to produce more qualified instrumentation technicians for local industry and to facilitate the matriculation of ITPR graduates to four-year programs at UMET. The laboratory facilities on two ITPR campuses are being upgraded and the faculty are receiving professional development in math and science content and modern pedagogical techniques. UMET is implementing a new bachelors of science degree in instrumentation, automation and control. The curriculum of the new degree is being developed in conjunction with ITPR and includes articulation agreements. The new degree makes extensive use of a state-of-the-art instrumentation and process control laboratory. The project includes rigorous formative and summative evaluation plans with both qualitative and quantitative components coordinated by an independent evaluator. The project results are being disseminated through conference and journal publications with a targeted effort to reach other Hispanic serving institutions.

Agency: NSF | Branch: Standard Grant | Program: | Phase: | Award Amount: 658.05K | Year: 2011

The investigators will acquire a state-of-the-art laser transmitter for the potassium Doppler resonance lidar at the Arecibo Observatory. This will replace the current transmitter, which is almost 15 years old and is difficult to maintain. The purpose of the upgrade is to 1) enhance upper-mesospheric research activities using new laser technology at Arecibo, 2) improve data quality, system reliability, and increased access to and training in the use of modern research instrumentation by scientists, engineers, and graduate and undergraduate students, and 3) implement a research training program in science, technology, engineering and mathematics (STEM) fields in optics with an emphasis on atmospheric remote sensing for students from pre-college through graduate school and science teachers from Puerto Rico at Universidad Metropolitanas Puerto Rico Optical Sciences Institute (PROptScI). The improved performance of the lidar will enhance the accuracy and precision of its measurements of potassium density and temperature and ultimately enable the measurement of winds in the mesosphere and lower thermosphere (MLT). When coupled with the ionospheric radar, the improved lidar will lead to around-the-clock measurements of MLT temperatures and winds, and daytime atmospheric air densities. The acquisition will create new synergy between the Arecibo Observatory and a majority-Hispanic university. Undergraduates from UMET will have the opportunity to participate in and learn the details of middle atmosphere research using state-of-the-art electro-optic technologies. These students will become leaders in their chosen careers because of the unique opportunities presented by this partnership. UMET will partner with the CRRL/CTC to develop lidar technologies and train undergraduate and graduate students who will be the next generation of lidar scientists.

Agency: NSF | Branch: Standard Grant | Program: | Phase: | Award Amount: 137.49K | Year: 2012

In the proposed project, Universidad Metropolitana and the University of Maryland Baltimore County will conduct a pilot workshop that will bring together noted experts from several communities, including the ADVANCE community, the NSF and gender studies researchers to broaden the professional and mentoring networks of Latina postdoctoral fellows and junior faculty. These institutions have a longstanding partnership in increasing the number of underrepresented minority students who earn the doctoral degree that dates back to 2003. However, since 2007, this partnership has been formalized through a memorandum of understanding that includes a focus on collaborations among faculty at both institutions. It is expected that the pilot workshop will provide a foundation upon which more meaningful and deliberate investigation of Hispanic women in the academic STEM disciplines can be examined. The workshop is characterized by relevant plenary and group breakout sessions that will provide attendees with the opportunity to better define the course of study on Latina STEM faculty and determine pathways to broader and future emphases as it relates to this target population.

Malhotra S.V.,Frederick National Laboratory for Cancer Research | Kumar V.,Frederick National Laboratory for Cancer Research | Velez C.,University Metropolitana | Zayas B.,University Metropolitana
MedChemComm | Year: 2014

A study of the effects of imidazolium-based ionic liquids on 60 human cancer cell lines representing diverse histologies has identified four compounds which show potency at a nanomolar dose. Their effects on annexin V, DNA fragmentation, and the cell cycle, together with mitochondrial membrane permeabilization tests, provide insights into their mechanism of action. Also, experiments with A431 human epidermoid carcinoma cells suggest the activation of an apoptotic pathway, due to activity of the initiator caspase 8 and effector caspase 3. © 2014 the Partner Organisations.

Discover hidden collaborations