Fabrication of high quality sub-micron Au gratings over large areas with pulsed laser interference lithography for SPR sensors

Metallic gratings were fabricated using high energy laser interference lithography with a frequency tripled Nd:YAG nanosecond laser. The grating structures were first recorded in a photosensitive layer and afterwards transferred to an Au film. High quality Au gratings with a period of 770 nm and peak-to-valley heights of 20-60 nm exhibiting plasmonic resonance response were successfully designed, fabricated and characterized.Comment: 10 pages, 7 figure

Comparison of Defuzzification Methods: Automatic Control of Temperature and Flow inHeat Exchanger

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Source model of the 2007 M_w 8.0 Pisco, Peru earthquake: Implications for seismogenic behavior of subduction megathrusts

We use Interferometric Synthetic Aperture Radar, teleseismic body waves, tsunami waveforms recorded by tsunameters, field observations of coastal uplift, subsidence, and runup to develop and test a refined model of the spatiotemporal history of slip during the M_w 8.0 Pisco earthquake of 15 August 2007. Our preferred solution shows two distinct patches of high slip. One patch is located near the epicenter while another larger patch ruptured 60 km further south, at the latitude of the Paracas peninsula. Slip on the second patch started 60 s after slip initiated on the first patch. We observed a remarkable anticorrelation between the coseismic slip distribution and the aftershock distribution determined from the Peruvian seismic network. The proposed source model is compatible with regional runup measurements and open ocean tsunami records. From the latter data set, we identified the 12 min timing error of the tsunami forecast system as being due to a mislocation of the source, caused by the use of only one tsunameter located in a nonoptimal azimuth. The comparison of our source model with the tsunami observations validate that the rupture did not extend to the trench and confirms that the Pisco event is not a tsunami earthquake despite its low apparent rupture velocity (<1.5 km/s). We favor the interpretation that the earthquake consists of two subevents, each with a conventional rupture velocity (2–4 km/s). The delay between the two subevents might reflect the time for the second shock to nucleate or, alternatively, the time it took for afterslip to increase the stress level on the second asperity to a level necessary for static triggering. The source model predicts uplift offshore and subsidence on land with the pivot line following closely the coastline. This pattern is consistent with our observation of very small vertical displacement along the shoreline when we visited the epicentral area in the days following the event. This earthquake represents, to our knowledge, one of the best examples of a link between the geomorphology of the coastline and the pattern of surface deformation induced by large interplate ruptures

Lealtad a la práctica deportiva: Una aplicación de la TPB a los servicios públicos para la práctica deportiva

The Theory of Planned Behavior (TPB) has been used in multiple industries and markets to explain the behavior of individuals. In the Colombian sports sector has never been used as a tool to model the behavior of individuals loyal to the sports offered by public institutions.In this study, the TPB model is proposed as a hypothesis to explain the history of loyalty to the sport, an empirical sample of 411 users of the programs of sport and physical activity INDERE (La Estrella, Antioquia) is collected, run a confirmatory factor analysis to ensure the reliability and validity of the measurement model and the hypotheses are tested by structural equation modeling.The study showed that TPB provides a good fit to model the behavior of loyalty to the sport and concluded that Perceived Control is the main antecedent of loyalty to sports such programs.La Teoría del Comportamiento Planificado (TPB) ha sido utilizada en múltiples sectores y mercados para explicar el comportamiento de los individuos. En el sector deportivo colombiano nunca se ha utilizado como herramienta para modelar el comportamiento de lealtad de los individuos hacia la práctica deportiva ofertada por las instituciones públicas.En el presente estudio se propone la TPB como modelo de hipótesis para explicar los antecedentes de la lealtad hacia la práctica deportica, se recoge una muestra empírica de 411 usuarios de los programas de deporte y actividad física del INDERE (La Estrella, Antioquia), se ejecuta un Análisis Factorial Confirmatorio para garantizar la fiabilidad y validez del modelo de medida y se contrastan las hipótesis mediante ecuaciones estructurales.El estudio evidencia que la TPB provee un buen ajuste para modelar el comportamiento de lealtad a la práctica deportiva y concluye que el Control Percibido es el principal antecedente de la lealtad a la práctica deportiva de dichos programas

Population genomics of local adaptation versus speciation in coral reef fishes (Hypoplectrus spp, Serranidae)

Are the population genomic patterns underlying local adaptation and the early stages of speciation similar? Addressing this question requires a system in which (i) local adaptation and the early stages of speciation can be clearly identified and distinguished, (ii) the amount of genetic divergence driven by the two processes is similar, and (iii) comparisons can be repeated both taxonomically (for local adaptation) and geographically (for speciation). Here, we report just such a situation in the hamlets (Hypoplectrus spp), brightly colored reef fishes from the wider Caribbean. Close to 100,000 SNPs genotyped in 126 individuals from three sympatric species sampled in three repeated populations provide genome-wide levels of divergence that are comparable among allopatric populations (Fst estimate = 0.0042) and sympatric species (Fst estimate = 0.0038). Population genetic, clustering, and phylogenetic analyses reveal very similar patterns for local adaptation and speciation, with a large fraction of the genome undifferentiated (Fst estimate ≈ 0), a very small proportion of Fst outlier loci (0.05–0.07%), and remarkably few repeated outliers (1–3). Nevertheless, different loci appear to be involved in the two processes in Hypoplectrus, with only 7% of the most differentiated SNPs and outliers shared between populations and species comparisons. In particular, a tropomyosin (Tpm4) and a previously identified hox (HoxCa) locus emerge as candidate loci (repeated outliers) for local adaptation and speciation, respectively. We conclude that marine populations may be locally adapted notwithstanding shallow levels of genetic divergence, and that from a population genomic perspective, this process does not appear to differ fundamentally from the early stages of speciation

Comportamiento del complejo amilxantato de cobre (II) en función del pH: estudio cinético de su formación

Se establece mediante espectrofotometría ultravioleta de luz visible el comportamiento del complejo amilxantato de cobre (II) en el rango de pH de 2 a 13 unidades, así como su cinética de formación. La especie amilxantato de cobre (II) muestra un incremento de su concentración a pH entre 7 y 10. Para valores de pH inferiores a 7 y superiores a 10 unidades se registra en los espectros ultravioleta visible la formación del disulfuro de carbono como evidencia de la descomposición del ión amilxantato, y por tanto una disminución de la concentración del complejo de cobre (II). El resultado del estudio cinético de la formación del complejo amilxantato de cobre (II) en el rango de temperatura de 298 a 333 K, sugiere que el mecanismo cinético del proceso está controlado por la reacción química. Se obtuvieron, además, los modelos matemático-estadísticos de la cinética de formación del complejo amilxantato de cobre (II) que reflejan el comportamiento de las variables estudiadas, las cuales influyen significativamente en el proceso. <br /

Magnetic Properties of MBE Grown La0.6Sr0.4MnO3 Thin Films

Honorable Mention Winner This project investigates the magnetic properties of a La1-xSrxMnO3 (x = 0.40) sample of high quality. This sample was grown one atomic layer at a time by Prof. Warusawithana using UNF’s Molecular Beam Epitaxy (MBE) machine. These magnetic properties are investigated over a range of temperatures from 5 to 400 K in fields up to 7 T. We make use of the techniques to analyze the sample to determine to a high degree of precision the critical temperature of the sample, we determined it to be 252 K. We further identified the saturated magnetization, remnant magnetization, and coercive field at 5 K to be 0.00733 emu/g, 0.00563 emu/g and 0.0090 T respectivel