NASA Manufacturing and Test Requirements for Normally Closed Pyrovalves for Hazardous Flight Systems Applications

Pyrovalves (figure 1, Basic Pyrovalve Design and Features,) are typically lighter, more reliable, and in most cases less expensive than other types of valves. They also consume less electrical power. They are single-use devices that are used in propulsion systems to isolate propellants or pressurant gases. These fluids may be hazardous because of their toxicity, reactivity, temperature, or high pressure. Note that in the simplified block diagram below not all detail features are shown so that those of major interest are more prominent. The diagram is provided to point out the various features that are discussed in this Specification. Features of some NC parent metal valve designs may differ. In 2013, the NESC concluded an extensive study of the reliability and safety of NC parent metal valves used in payloads carried aboard ELVs. The assessment successfully evaluated technical data to determine the risk of NC parent metal valve leakage or inadvertent activation in ELV payloads. The study resulted in numerous recommendations to ensure personnel and hardware/facility safety during ground processing of ELV payloads. One of those recommendations was to establish a NASA specification for NC parent metal valves. This Specification is a result of that recommendation, which is documented in NESC-RP-10-00614

Obsessive-Compulsive Disorder Reconsidered

OBSESSIVE-COMPULSIVE DISORDERS: THEORY & MANAGEMENT Edited by Michael A. Jenike, Lee Baer, William E. Minichiello Littleton, Mass, PSG Publishing Company, In c.1986. 196 pages, $24.5

Studies on the origin and transmission of fowl paralysis (Neurolymphomatosis) by blood inoculation

Publication authorized August 19, 1939.Digitized 2007 AES.Includes bibliographical references (pages 18-23)

Trichomoniasis of turkeys

Cover title."A revision of Bulletin 456"--P. [3]

Coccidiosis in chickens and other birds

Cover title."Bulletin 372 revised"--Cover

Coccidiosis in chickens and other birds

Cover title."Revision of Bulletin 411.

Religious and Secular Coping Strategies and Mortality Risk among Older Adults

Using data from the Wisconsin Longitudinal Study, the purpose of this study is twofold. First, the study identifies coping strategies used by older adults. Second, the study examines the impact of older adults’ chosen coping strategies on mortality reduction. The study focuses specifically on differences in the use of religious and secular coping strategies among this population. The findings suggest that although coping strategies differ between those who self-classify as religious and those who self-classify as nonreligious, for both groups social approaches to coping (e.g., attending church and volunteering) are more likely than individual approaches (e.g., praying or active/passive coping) to reduce the risk of mortality. The most efficacious coping strategies, however, are those matched to characteristics of the individual

Trichomoniasis of turkeys

Cover title

Further investigations of the transmission of fowl paralysis (Neurolymphomotosis) by direct transfusion

Publication authorized August 24 1945.Digitized 2007 AES.Includes bibliographical references (page 18)

Common internal and external parasites of poultry

Cover title