Pulsed single-photon spectrometer by frequency-to-time mapping using chirped fiber Bragg gratings.

A fiber-integrated spectrometer for single-photon pulses outside the telecommunications wavelength range based upon frequency-to-time mapping, implemented by chromatic group delay dispersion (GDD), and precise temporally-resolved single-photon counting, is presented. A chirped fiber Bragg grating provides low-loss GDD, mapping the frequency distribution of an input pulse onto the temporal envelope of the output pulse. Time-resolved detection with fast single-photon-counting modules enables monitoring of a wavelength range from 825 nm to 835 nm with nearly uniform efficiency at 55 pm resolution (24 GHz at 830 nm).

Falling through the cracks of the big cities: who is meeting the needs of HIV-positive youth?

Background: Globally, half of all new HIV infections occur among youth under 25. As of June 30, 2002, more than 13,000 youth and young adults had tested positive for HIV in Canada. Despite this prevalence, there is a lack of resources for Canadian HIV-positive youth.

"Supposed to make you better but it doesn't really": HIV-positive youths' perceptions of HIV treatment.

Purpose: Half of new HIV infections worldwide occur among young people. Youth, particularly young women aged 15-29 years, represent a growing population to experience HIV. This study investigated HIV-positive youths' perceptions of, and experiences with, antiretroviral treatment.

HIV-positive youth's perspectives on the Internet and e-health.

Background: Globally, half of all new HIV infections occur among young people. Despite this incidence, there is a profound lack of resources for HIV-positive youth.

Objective: To investigate Internet access, use and acceptability as means for health promotion and health service delivery among HIV-positive youth.