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Now showing items 2761-2770 of 3112
Tuning of multifunctional properties of undoped and doped BiFeO3
(2018)
This work studied the effect of the incorporation of Co2+ and Mn2+ species on the structural and magnetic properties of nanocrystalline powders of BiFeO3 (BFO) synthesized by the sol-gel and thermal treatment method at ...
MHD flow visualization of magnetopause boundary region vortices observed during high speed streams
(2007)
We present statistics for a total of 304 vortices found near the ecliptic plane on the magnetopause flanks, using simulated Magnetohydrodynamic (MHD) data driven by real solar wind con- ditions. The study concentrates on ...
Sample ESL oral tests to assess English proficiency skills of pre-basic students at UPRM
(2009)
No specific test exists to assess oral proficiency of English as a Second Language in PR. Therefore, new instruments were designed, developed, and piloted for undergraduate Pre-Basic students. The Sample Oral Test developed ...
Relación hospedero Parasitoide y dinámica poblacional de los parasitoides de las masas de huevos de Diaprepes Abbreviatus (L.) (Coleoptera : Curculionidae) en Puerto Rico
(2003)
A study was done at Adjuntas and Isabela with the purpose of identifying the parasitoid species associated with the eggs mass of the sugarcane weevil. Four species of parasitoids were found, three in the family Eulophidae ...
Conversión de pulpa y mucílago del café en vermicomposta mediante el uso de la lombriz Eisenia foetida
(2008)
The objective of the investigation is to obtain information for the establishment of a vermicompost system for the coffee processing in Puerto Rico. A complete randomized block design was used with four treatments for a ...
Fabrication of porous metals via selective phase dissolution of an Al-Cu alloy
(2018-06-01)
Through free corrosion in sodium hydroxide, a new porous material was
successfully fabricated by removing a single phase of the aluminum-copper
alloy. This selective phase dissolution was performed for the eutectic
composition ...
Cuñas en sistemas dinámicos
(2010-12)
Para ciertos sistemas dinámicos no lineales de punto fijo, computamos el tiempo que toma dicho sistema en alcanzar un estado de quietud. En este trabajo introducimos la operación de cuña entre dos grafos dirigidos. Cuando ...
A crash and resume query mechanism for the nettraveler database middleware system
(2009)
The need of ubiquitous data access is quickly emerging in our everyday life. The devices that we would like to access are usually heterogeneous. These heterogeneous devices may contain their own set of protocols and ...
Modeling and simulation of energy grids under transactive energy markets
(2018-05)
Electric grids are an important aspect of the civil infrastructure of our society. Traditional
energy grids are being modernized with the introduction of smart grids and
transactive energy concepts. In a smart grid ...
Simulaciones por computadora de un modelo espacio-temporal para la interacción del sistema inmunológico y los tumores cancerosos
(2008)
In this work we have carried out a study of the growth of a cancer tumor using computer simulation, implementing a model for the competition of nutrients. This model was extended by incorporating the interaction of the ...