6,123 research outputs found
Selena Quintanilla- Bridging the Gap Between Hispanics and US Americans
The textual or investigative physical poster will examine Selena Quintanilla and her impact on pop culture history as a Hispanic American. Selena Quintanilla was born in Texas to a Mexican American family. Selena, due to her vocal talents, was able to become a well-known singer and was deemed as the Queen of Tejano . ln 1994, Selena Quintanilla was the first Tejano artist won a Grammy Award for her album, Selena Live! Throughout her success, she was able to pave the way for many upcoming Hispanic Americans artists. This presentation would focus primarily on Selena Quintanilla being a second generation American as she navigated the integration of her two cultures into her distinctive music. The presentation would analyze her interviews in which she vocally expresses her gratitude of being Mexican American and will analyze her music as it perfectly displays her combined cultures. Lastly, the presentation will examine people\u27s, mainly Hispanic\u27s, perception of Selena Quintanilla throughout her career. Selena Quintanilla predominately was a beloved Hispanic American artist yet was still subjected to criticism from Hispanics as she was deemed \u27not Hispanic enough\u27 and would also be label \u27too Hispanic\u27 from U.S. Americans. Nevertheless, Quintanilla did not allow these labels to negatively define her and used these critics as motivation to release quality music. Overall, Selena Quintanilla was able to successfully unite her two cultures and bridge the gap that society has created between the Hispanic and US American culture. The presentation also focused on the importance of studying pop culture history. Pop culture history is currently undervalued; however, pop culture history is a window that displays the societal values of a set period of time. Researching Selena Quintanilla allows us to understand the culture of the 1990\u27s music as well as underlying societal pressures of being Hispanic American
A characterization of triangulations of closed surfaces
In this paper we prove that a finite triangulation of a connected closed
surface is completely determined by its intersection matrix. The
\emph{intersection matrix} of a finite triangulation, , is defined as
, where is a labelling of the triangles of .Comment: Submitted to EUROCOMB 201
Evaluating cerium (IV) oxide nanoparticles membrane behaviour and related toxicity
Cerium (IV) oxide nanoparticles (CeO2 NPs or nano-ceria) are one of the most popular NPs used in both industry and medicine. Nowadays, CeO2 NPs could be considered as one of the NPs with better prospects for future applications in medicine. CeO2 NPs have the ability to change between oxidation states Ce(IV) and Ce(III) creating oxygen vacancies in their structure. This ability, in theory, could regulate oxidative stress (OS). However, there are many contradictory reports regarding the beneficial or adverse effects CeO2 NPs produce when internalised in the body. In addition, the mechanisms through which CeO2 NPs interact once internalised in the body are not yet totally understood.
This thesis analyses the interaction between CeO2 NPs and phospholipids (DOPC, DOPG, DOPE, DOPA and DOPS) using a biosensor able to mimic the cellular membrane. The working electrode of the electrochemical sensing device (ESD) consists of a mercury coated platinum electrode (Hg/Pt electrode) where phospholipids are deposited. CeO2 NPs with different size and shapes (spheres, cubes, needles and dots) are synthesised using wet-chemical and hydrothermal methods. Also, coated CeO2 NPs were synthesised using PVP, PEG, dextran and the CeO2 NPs were treated with PBS. The NPs were characterised using TEM, SAED, EDX, XRD, DLS and Z-Potential.
Results show the chemical behavior of the CeO2NPs is related to a large extent to the characteristics of the NPs surface, the characteristics of their dispersion media and the size of the NPs. CeO2 NPs (spheres, cubes, needles and dots) did not show an interaction with the phospholipid membrane (DOPC) when the system was under a continuous flow of phosphate saline buffer (PBS, pH 7.4) and citric-citrate buffer (CCB, pH 4.0, 5.0, 6.0). Nevertheless, an interaction was observed when the system was under a continuous flow of CCB (pH 3.0) and GLY (3.0). It was concluded that Ce3+ on the NPs surface can bind to the phosphate group of the phospholipid polar heads when the NPs are in GLY 3.0. Results also showed that citrate on the CeO2 NPs surface hampers the interaction with the phospholipid monolayer at pHs above 3.0. Additionally, at acidic pH (pH 3.0), the CeO2 NPs (spheres and cubes) were able to cross the phospholipid monolayer and directly interact with the Hg/Pt electrode showing a semiconductor effect. Needles, which were bigger in size, did not produce a semiconductor effect under the same conditions. The semiconductor effect decreases as size increases. The interaction of the coated CeO2 NPs with DOPC was found to be dependent on the coating agent. In this way, the interaction between DOPC and the NPs was produced by the coating agent, not the NPs. Finally, CeO2 showed to be inert when interacting with DOPA, DOPG and DOPE under a continuous flow of PBS. The only exception was the dots, which produced a significant interaction with DOPA under the same conditions
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Spatial pricing empirical evaluation of ride-sourcing trips using the graph-fussed lasso for total variation denoising
This study explores the spatial pricing discrimination of ride-sourcing trips using empirical data. We use information from more than 1.1 million rides in Austin, Texas, provided by a non-profit transportation network company from a period where the main companies were out of the city. We base the analysis on operational variables such as the waiting or idle time between trips, reaching time, and trip distance. Also, we estimate three different productivity measures to evaluate the impact of the trip destination on the driver continuation payoff. We propose the application of a total variation denoising method that enhances the spatial data interpretation. The selected methodology, known as the graph-fussed lasso (GFL), uses an l₁-norm penalty term that presents a variety of benefits to the denoising process. Specifically, this approach provides local adaptivity; it can adapt to inhomogeneity in the level of smoothness across the graph. Solving the GFL smoothing problem involves convex-optimization methods, we make use of a fast and flexible algorithm that presents scalability and high computational efficiency. The principal contributions of this research effort include a temporal and spatial evaluation of different ride-sourcing productivity measures in the Austin area, an analysis of ride-sourcing trip pricing and its effect on driver equity, and a description of the principal ride-sourcing travel patterns in the city of Austin. The main results suggest that drivers with rides ending in the central area present favorable spatial differences in productivity when including the revenue of two consecutive trips. However, the time effect was more contrasting. Weekend rides tend to provide better driver productivity measures.Statistic
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