"RTCA DO-213 Minimum Operational Performance Standards For Nose-Mounted Radomes" 1 is a document frequently referenced in nose-radome testing requirements for commercial aircraft. This document was ...produced and is maintained by the Radio Technical Commission for Aeronautics (RTCA). The specifications of weather-radar systems have recently changed within RTCA's D0-220A 2, and as a result DO-213 was updated to DO-213A 3 in March, 2016, to ensure that radome requirements are consistent with those of the weather radar. In addition to the new requirements for radome evaluation, several existing requirements were clarified. These clarifications addressed such topics as suitability of near-field measurements, proper procedures and processing, and appropriate measurement geometries. RTCA coordinated the document revision, with the bulk of the technical inputs coming from a broad-based working group. This working group had representatives from radar, aircraft, and radome manufacturers, government agencies, and providers and users of radome-testing systems. When requirements were added or when common practice conflicted with existing requirements, considerable effort and analysis were employed to ensure that each change or clarification was truly required. Nevertheless, DO-213A has some significant impacts to many existing radome-testing facilities. This paper discusses the significant changes from DO-213 to DO-213A and their implications for radome-testing facilities, concentrating on after-repair radome electrical testing.
This is the first report in the nuclear medicine literature of the scintigraphic appearance of the piriformis muscle syndrome. This syndrome previously has been thought to be a purely clinical ...diagnosis and imaging modalities have been ignored. However, its confusing clinical presentation can lead to unnecessary surgical exploration. This case is presented to illustrate the characteristic scintigraphic pattern and suggest the role of nuclear medicine scanning in establishing the diagnosis.
A study was conducted to determine free and protein-bound pools of glutathione and cysteine in the plasma of male broiler chicks. Birds were brooded in battery cages and provided ad libitum access to ...a starter diet and water. Plasma was treated with a reducing agent, dithiothreitol (DTT), or left untreated, and analyzed by HPLC to determine free and protein bound pools of reduced (GSH) and oxidized (GSSG) glutathione, cysteine (Cyss). With respect to total plasma pools of GSH and Cys, between 0 and 21 d of age; 1) free GSH increased from 30 to 90% with a reciprocal decrease in protein-bound GSH, but GSSG was not detected; and 2) free Cys decreased from 20 to 10%, free Cyss increased from 24 to 45%, and protein-bound Cys decreased from 55 to 44%. The majority of the GSH plasma pool in this study was present in a free, acid-soluble form, whereas most of the total Cys pool was present as Cyss or bound to protein
Strategies for deployment of picture archiving and communications systems (PACS) in new hospitals often involve the establishment of initial PACS operations. Such a strategy is flawed in the sense ...that the clinical and radiological users must adapt to PACS operations, while being faced with several other new facility learning curves. This increases the complexity and risk of the radiological services. A strategy of implementing PACS operations in the old facility and performing a zero-downtime transition into the new facility offers several advantages to this method. The successful undertaking of such a project will support not only the physical movement of the existing PACS, but the accomplishment of other re-engineering goals associated with the new hospital. This report will describe the strategy used in two successful transitions of PACS into newly constructed hospitals.
Conclusion and additional resources Cawthon, Tony W.; Forney, Deanna S.; Bramhall, Ron ...
New directions for student services,
12/2004, Letnik:
2004, Številka:
108
Journal Article
This chapter offers tips and additional books, films, television shows, Web sites, and other media resources for teaching and training.
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