Angela B. Ruffin

Learn More
We propose a criterion to predict the relative value of the stimulated Brillouin scattering (SBS) threshold in single-mode optical fibers with different refractive index profiles. We confirm our results by several representative measurements. We show that with the proper profile design one can achieve more than 3 dB increase in the SBS threshold compared to(More)
This paper reports selected results from two comprehensive evaluation studies of the Information Prescription (or "Information Rx") Program implementation conducted from 2002-05 by the American College of Physicians Foundation (ACPF) and the U.S. National Library of Medicine (NLM). In this Program physicians are provided with Information Prescription pads,(More)
We demonstrate the reconstruction of one- and two-dimensional objects by numerically backpropagating measured scattered terahertz transients. The spatial resolution determined by the Sparrow criterion is found to correspond to approximately 30% of the peak wavelength and 85% of the mean wavelength of the power spectrum of the single-cycle waveform.
As incorporated in Healthy People 2010 objectives, data and information systems and a skilled workforce are 2 of the critical components of the public health infrastructure. The National Library of Medicine (NLM) and the National Network of Libraries of Medicine (NN/LM) are important resources for improving Internet access and providing related training to(More)
OBJECTIVES To develop a knowledgebase of stories illustrating the variety of roles that librarians can assume in emergency and disaster planning, preparedness, response, and recovery, the National Library of Medicine conducted an oral history project during the summer of 2007. The history aimed to describe clearly and compellingly the activities--both(More)
In 1890 Gouy showed that a focused electromagnetic beam will acquire an additional axial 180± phase shift with respect to a plane wave as it evolves through its focus [1–3]. This phase shift has important consequences throughout the electromagnetic spectrum. It explains the phase advance postulated by Fresnel for the secondary Huygens’ wavelets emanating(More)
Abstract In 2000 the National Library of Medicine (NLM), a component of the National Institutes of Health, funded fifty-three consumer health outreach projects through the National Network of Libraries of Medicine (NN/LM). The goal of all projects was to improve access to electronic health information for consumers. Drawing on experience gained in the NN/LM(More)
OBJECTIVES This paper provides the most complete accounting of the National Library of Medicine's (NLM's) Native outreach since 1995, when there were only a few scattered projects. METHOD The descriptive overview is based on a review of project reports, inventories, and databases and input from the NLM Specialized Information Services Division, National(More)
We propose a novel approach of making large effective area laser fiber with higher threshold for the stimulated Brillouin scattering (SBS) using Al/Ge co-doping in the fiber core. The increased SBS threshold is achieved by reducing the acoustic-optic overlap integral while keeping the optical refractive index profile with a step structure. The manipulation(More)