Trapped Rainbow Techniques for Spectroscopy on a Chip and Fluorescence Enhancement

We report on the experimental demonstration of the broadband "trapped rainbow" in the visible range using arrays of adiabatically tapered optical nano waveguides. Being a distinct case of the slow light phenomenon, the trapped rainbow effect could be applied to optical signal processing, and sensing in such applications as spectroscopy on a chip, and to providing enhanced light-matter interactions. As an example of the latter applications, we have fabricated a large area array of tapered nano-waveguides, which exhibit broadband "trapped rainbow" effect. Considerable fluorescence enhancement due to slow light behavior in the array has been observed.Comment: 15 pages, 4 figures, Published in Applied Physics

On global models for isolated rotating axisymmetric charged bodies; uniqueness of the exterior field

A relatively recent study by Mars and Senovilla provided us with a uniqueness result for the exterior vacuum gravitational field generated by an isolated distribution of matter in axial rotation in equilibrium in General Relativity. The generalisation to exterior electrovacuum gravitational fields, to include charged rotating objects, is presented here.Comment: LaTeX, 21 pages, uses iopart styl

Experimental observation of the trapped rainbow

We report on the first experimental demonstration of the broadband "trapped rainbow" in the visible frequency range using an adiabatically tapered waveguide. Being a distinct case of the slow light phenomenon, the trapped rainbow effect could be applied to optical computing and signal processing, and to providing enhanced light-matter interactions.Comment: 2 pages, 1 figur

The Effect of Citra Kirana Brand Ambassador on Consumer Confidence on Kiranti\u27s Product Hoax Information in Social Media

This study is the result of quantitative research to test the hypothesis that brand ambassadors Citra Kirana has an effect on the level of consumer confidence inthe hoax information kiranti\u27s product on social media. Samples in this study were 70 respondents, determining the sample using stratified sampling technique with the criteria of respondents teenage girls in Yadika High School 3. Tests of data analysis using validity, reliability, ANOVA test and simple linear regression test. By looking at the Anova table test there is a P-value at a significant column of large 0,000 <0,005 level of significant meaning that there is an influence between the two variables. it can be concluded that Ha is accepted and Ho is rejected. The results of the determination coefficient (r square) amounted to 0.206 which means that the brand ambassador variable of Citra Kirana was able to increase consumer confidence in the Kiranti product hoax information on social media by 20.6%

BFKL Pomeron, Reggeized gluons and Bern-Dixon-Smirnov amplitudes

After a brief review of the BFKL approach to Regge processes in QCD and in supersymmetric (SUSY) gauge theories we propose a strategy for calculating the next-to-next-to-leading order corrections to the BFKL kernel. They can be obtained in terms of various cross-sections for Reggeized gluon interactions. The corresponding amplitudes can be calculated in the framework of the effective action for high energy scattering. In the case of N=4 SUSY it is also possible to use the Bern-Dixon-Smirnov (BDS) ansatz. For this purpose the analytic properties of the BDS amplitudes at high energies are investigated, in order to verify their self-consistency. It is found that, for the number of external particles being larger than five, these amplitudes, beyond one loop, are not in agreement with the BFKL approach which predicts the existence of Regge cuts in some physical channels.Comment: 41 pages, expanded version with many clarifications and new references, conclusions unchanged. Note adde

Diseño de un modelo de datos de redes para el transporte multimodal

Esta comunicación tiene por objeto el análisis de las relaciones entre redes de transporte y paisaje. Se aborda el análisis de la estructura de la red y su caracterización, para dar soporte a la modelización de distintos escenarios, lo que implica un complejo modelo de datos en el que se trabaja con una red multimodal conformada por los siguientes modos: transporte por carretera, ferroviario, peatonal y náutico. Se hace hincapié en el transporte combinado que emplea los diferentes modos, como ocurre frecuentemente con el viaje turístico. El territorio en el que se construye el modelo, a partir de los mapas topográficos 1:5000 y 1.000, que se complementan con ortofotografía, es la isla de Tenerife.This paper explores the relationship between transport networks and landscape. The network structure and its characteristics are studied in order to support the modeling of different scenarios. This implies a complex data model which works with a multimodal network. It is composed by different features: roads, railroads, pedestrian paths and nautical tracks. A combined transport system (the touristic travel) employing different modalities is the focus of interest. Tenerife Island acts as a reference of this transport system. Base maps in 1:5000 and 1:1000 scales and a rectified photo are used

Largest Digraphs Contained IN All N-tournaments

Let f(n) (resp. g(n)) be the largest m such that there is a digraph (resp. a spanning weakly connected digraph) on n-vertices and m edges which is a subgraph of every tournament on n-vertices. We prove that n log2 n--cxn>=f(n) ~_g(n) ~- n log ~ n--c..n loglog n