Statistical Fading of a Plane Optical Wave in Atmospheric Turbulence

A formula for the average fade time of the intensity of a plane optical wave traveling through atmospheric turbulence is developed. The model employed involves isotropic, homogeneous statistics using a lognormal distribution for the channel. The analysis is based on the fact that the logarithm of the irradiance is normally distributed and uses the work of S. O. Rice who developed such an expression for a zero mean, Gaussian process. The analysis employs the covariance function and the Taylor frozen turbulence hypothesis which results in an expression for the autocorrelation function

Latina Adolescents\u27 Perspectives on Relationships

Objective: To explore adolescent Latinas’perspectives on relationships and generate knowledge to inform interventions. Setting: Seven Latina adolescents participated. Design: This qualitative study was guided by principles of community-based participatory research and utilized the photovoice method. Method: Participants took photos depicting elements of relationships and participated in guided discussions. They identified and named five elements of healthy relationships. Results: The five elements included commitment, communication, faith, amigos y amores (friends and lovers) and play. These elements occur across all forms of relationships. Conclusion: The results revealed important information that may be used to tailor health promotion interventions for Latina/o youth