First observed in gaseous plasmas in the early 1960’s, helicon discharges lay like a sleeping giant until they emerged in the 1980’s, when their usefulness as efficient plasma sources for processing microelectronic circuits for the burgeoning semiconductor industry became recognized. Research on helicons spread to many countries; new, challenging, unexpected problems arose, and these have spawn...

Teen pregnancy and parenting remain an important public health issue in the United States and the world, and many children live with their adolescent parents alone or as part of an extended family. A significant proportion of teen parents reside with their family of origin, significantly affecting the multigenerational family structure. Repeated births to teen parents are also common. This clin...

OBJECTIVE The top 50 commercially successful films released per year from 1991 to 2000 were content coded to assess trends in tobacco use over time and attributes of films predictive of higher smoking rates. DESIGN This observational study used media content analysis methods to generate data about tobacco use depictions in films studied (n = 497). Films are the basic unit of analysis. Once fi...

The evolution, accomplishments, and impact of the surface extended x-ray absorption fine structure ( S E W S ) technique are presented. Critical evaluations of previous studies and current assessments of experimental methodology, data analysis procedures, and inherent and practical limitations of the method are discussed. Previously unreported correlations are found between simple concepts of i...