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Now showing items 11-20 of 33
Crash modification factors for rumble strips treatment in freeway
(2015-12)
Longitudinal shoulder rumble strips is a safety feature or treatment on a paved shoulder, capable of alerting drivers that their motor vehicle is departing the traveled lane. This treatment has proven to be effective ...
Flood alert system using rainfall data in the Mayagüez Bay drainage basin, Western Puerto Rico
(2014)
Las inundaciones son el tipo de desastres naturales más costoso mundialmente. El presente trabajo es el primer intento para introducir un Sistema de Alerta de Inundaciones en el oeste de Puerto Rico, usando radares con ...
Novel titanium silicate porous materials: Synthesis using large structure directing agents, functionalization and evaluation for carbon dioxide adsorption-based applications
(2015-12)
UPRM-5 is a flexible titanium silicate and nano-porous adsorbent modified for the selective removal of CO2 from light gas mixtures. In this work, UPRM-5 was prepared using TPA and TBA cations as structure directing agents ...
Rheological and mechanical characterization of portland cement mixes containing micro and nano amorphous silica particles
(2013)
In concrete technology, it is common to use fly ash (FA) and micro-SiO2 (SF) as mineral admixtures. This has resulted in improvements in the fresh and hardened states. On the other hand, nano-SiO2 (nS) is industrially ...
Dynamic transportation and humanitarian logistics model: a decision support tool to forecast and prioritize critical supplies distribution during emergency relief operations
(2013)
The optimal mobilization of materials, personnel and relief supplies to a disaster site could be the difference between life and death for the affected population. The purpose of this dissertation is to develop a system ...
Seismic analysis of horizontal axis wind turbines
(2010)
The wind energy industry has seen a substantial growth in several industrialized countries in recent years. Traditionally, territories in northern Europe, with a low level of seismicity, have been the leaders in the use ...
Behavior of corrugated metal panels for use as storm shutters
(2009)
This investigation presents a study of the nonlinear dynamics of thin-walled folded plate structures under the localized impact of a rigid object. The research emerges in the context of the structural design and assessment ...
Seismic response of RC frame buildings with non reinforced exterior beam column joints
(2011)
Recent earthquakes have demonstrated the risk that reinforced concrete structures constructed before 1970 represent for society since these structures were designed with design codes in which the seismic provisions were ...
Effect of cyclic high loading rates on the fatigue strength of aluminum-based composites
(2009)
The study of fatigue under high loading rates is of great interest in the complete characterization of a new series of composites with Al-Cu-Mg matrix reinforced with AlB2 dispersoids. Homogeneous and functionally graded ...
Impact of transit organization on ridership
(2012)
This research evaluates the hypothesis suggesting that organizational characteristics of transportation institutions have an impact on their transit system’s ridership.
It is important to emphasize that this research is ...