Stochastic band structure for waves propagating in periodic media or along waveguides

We introduce the stochastic band structure, a method giving the dispersion relation for waves propagating in periodic media or along waveguides, and subject to material loss or radiation damping. Instead of considering an explicit or implicit functional relation between frequency $\omega$ and wavenumber $k$, as is usually done, we consider a mapping of the resolvent set in the dispersion space $(\omega, k)$. Bands appear as as the trace of Lorentzian responses containing local information on propagation loss both in time and space domains. For illustration purposes, the method is applied to a lossy sonic crystal, a radiating surface phononic crystal, and a radiating optical waveguide. The stochastic band structure can be obtained for any system described by a time-harmonic wave equation

Electrostriction and guidance of sound by light in optical fibers

We investigate the generation of phonon wavepackets in optical fibers via electrostriction from coherent optical waves. Solving the elastodynamic equation subject to the electrostrictive force, we are able to reproduce experimental spectra found in standard and photonic crystal fibers. We discuss the two important practical cases of forward interaction, dominated by elastic resonances of the fiber, and backward interaction, for which an efficient mechanism of phonon guidance by light is found. The latter result describes the formation of the coherent phonon wavepacket involved in stimulated Brillouin scattering

Sublabel-Accurate Relaxation of Nonconvex Energies

We propose a novel spatially continuous framework for convex relaxations based on functional lifting. Our method can be interpreted as a sublabel-accurate solution to multilabel problems. We show that previously proposed functional lifting methods optimize an energy which is linear between two labels and hence require (often infinitely) many labels for a faithful approximation. In contrast, the proposed formulation is based on a piecewise convex approximation and therefore needs far fewer labels. In comparison to recent MRF-based approaches, our method is formulated in a spatially continuous setting and shows less grid bias. Moreover, in a local sense, our formulation is the tightest possible convex relaxation. It is easy to implement and allows an efficient primal-dual optimization on GPUs. We show the effectiveness of our approach on several computer vision problems

CODE MIXING IN WRITING OPINION ON MEDIA INDONESIA NEWSPAPER

ABSTRACTIn comuniction and social interaction process appear a speaker to use language variation, like: code switching and code mixing. This research only focused in code mixing. Code-mixing was mixing foreign language elements in to the structure of main language. The purpose of this research was to describe the form, background and function of the use of code-mixing in the opinion writing of Media Indonesia News paper. This study used qualitative research. Based on the data analysis, obtainsed descriptions of the use of code mixing form of phrases, words, baster and clauses, description of the background of code- mixing that used outer code- mixing ie. ie using English. The description of the use of code- mixing which serves to identify the role, identification of diversity, and the desire to explain and interpret.Keyword : code mixing, writing opinion, news paper

The Institutional Program for Scholarships for Initiation in Teaching in Brazil – and a Teaching Program in Music – The Relation between Theory and Practice

AbstractThis article presents the Institutional Program for Scholarships for Initiation in Teaching (Pibid), in Brazil, with its characteristics and organizational forms and analyzes it from the perspective of a Licentiate Program in Music which recently began its participation in this scholarship program. It seeks to analyze the possible difficulties which could present themselves throughout the process. To analyze the subject documents and legal orientations will be used such as the presidential decree instituting the Pibid and the current Pedagogical Project of the Licentiate Program in Music. Besides this the theoretical referential is based on Tardif, Keil and Vygotsky

COGNITIVE AND BEHAVIORAL MECHANISMS UNDERLYING ALCOHOL-INDUCED RISKY DRIVING

Alcohol intoxication represents one situation an individual might increase their amount of risk taking when driving. This dissertation is comprised of three studies that investigate the mechanisms by which alcohol increases driver risk-taking. Study 1 examined the effect of alcohol on driver risk-taking using a proxemics approach. The study also tested whether alcohol-induced increases in risky driving co-occurred with pronounced impairment in the driver’s skill. The study also examined whether the most disinhibited drivers were also the riskiest. Indeed, alcohol increased driver risk-taking and impaired driving skill. The study also revealed risky driving can be dissociable from impairing effects on driver skill and that poor inhibitory control is selectively related to elevated risky driving. Studies 2 and 3 built on this work by addressing whether the apparent dissociation between behavioral measures of driver risk and skill was mediated by perceptions the drivers held. While maintaining the distinction between driver risk and skill, Study 2 tested the relationship between drivers’ BAC estimations and their tendency to take risks on the roadway. Drivers who estimated their BAC to be lower were the riskiest drivers following both alcohol and placebo. Study 3 addressed whether risky driving could be increased by environmental factors that shape perceptions the driver holds. There is evidence post-licensure training programs might inadvertently generate overconfidence in drivers’ perceived ability to operate a motor vehicle and thus fail to perceive dangers normally associated with risky driving behavior. To test this hypothesis, twenty-four drivers received either advanced skill training or no training in a driving simulator. Drivers who received skill training showed increased risky driving under alcohol whereas those who received no training tended to decrease their risk taking. Trained drivers also self-reported more confidence in their driving ability. Taken together, these studies represent a large step towards the betterment of laboratory-based models of driving behavior. The work highlights the importance of distinguishing between driver risk-taking and driving skill. The studies also identified that drivers’ personal beliefs influence alcohol-induced risky driving; this suggests training programs focused on correcting drivers’ misconceptions might be most efficacious in reducing their risk taking on the roadway

La terapia psico-espiritual malāmati

Abstract not availabl