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  • 1
    Electronic Resource
    Electronic Resource
    Attenuation of the Petal Movement Rhythm in Kalanchoë with Light Pulses (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 43 (1978), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The circadian petal movement rhythm of Kalanchoë flowers has been studied. The amplitude of the rhythm can be drastically reduced by an appropriate stimulus of a light pulse. It has also been shown that it is possible to stop the rhythm permanently by administering a single light pulse to the flowers. This is interpreted to indicate that the light pulse has sent the circadian rhythm into a stable state of singularity.The conditions which attenuate the rhythm have been investigated both theoretically (on the basis of a previously published model for circadian rhythms) and experimentally. 120 min red light of 230 μW · cm−2, starting briefly before the second petal closure about 30 h after transfer to constant safe light conditions is optimal in inducing rhythm-damping. Damping requires the same duration when the light is given at the corresponding phase during the third or fourth cycle of the rhythm. However, in the first cycle 240 min red light of 230 μW · cm−2 is required to get optimal damping of the rhythm.Conditions to achieve damping for other irradiances are investigated. Individual recordings are presented which show the behaviour of the rhythm when perturbed by light stimuli close to its singularity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1978.tb01569.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Approach for service life extension of explosive devices for aircraft escape systems (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Service life extension of explosive devices used in aircraft escape systems can achieve considerable savings. An overall approach is needed to challenge the logic of explosive component service extension from design to removal from service for evaluation. The purpose of the effort described in this paper was to develop a service-extension approach on explosive devices used in aircraft systems, supported by actual testing of representative candidate devices, to evaluate quantitatively the effects of service, age, and degradation, and allow responsible, conservative service life determinations. Evaluated were five explosive components: rigid and flexible explosive transfer lines, one-way transfers, flexible linear shaped charges, and initiation handles. The service extension approach generated in this effort is summarized by eight recommendations.
    Keywords: PROPELLANTS AND FUELS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Approach for Service Life Extension of Explosive Devices for Aircraft Escape Systems (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The service life evaluation of explosive devices used in a wide variety of aircraft escape systems is described. The purpose was to develop a service extension approach, supported by tests on candidate devices, to evaluate the effects of service, age, and degradation, and allow responsible, conservative, service life determinations. An overview is given on the recommended approach and experimental procedures for accurate service evaluations with test results on rigid and flexible explosive transfer lines, one-way transfers, and flexible linear shaped charges.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-86323 , NAS 1.15:86323
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Service life evaluation of rigid explosive transfer lines (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This paper describes a joint Army/NASA-sponsored research program on the service life evaluation of rigid explosive transfer lines. These transfer lines are used to initiate emergency crew escape functions on a wide variety of military and NASA aircraft. The purpose of this program was to determine quantitatively the effects of service, age, and degradation on rigid explosive transfer lines to allow responsible, conservative, service life determination. More than 800 transfer lines were removed from the U.S. Army AH-1G and AH-1S, the U.S. Air Force B-1 and F-111, and the U.S. Navy F-14 aircraft for testing. The results indicated that the lines were not adversely affected by age, service, or a repeat of the thermal qualification tests on full-service lines. Extension of the service life of rigid explosive transfer lines should be considered, since considerable cost savings could be realized with no measurable decrease in system reliability.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TP-2143 , L-15558 , NAS 1.60:2143
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Quantitative understanding of explosive stimulus transfer (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The mechanisms of detonation transfer across hermetically sealed interfaces created by necessary interruptions in high explosive trains, such as at detonators to explosive columns, field joints in explosive columns, and components of munitions fuse trains are demostrated. Reliability of detonation transfer is limited by minimizing explosive quantities, the use of intensitive explosives for safety, and requirements to propagate across gaps and angles dictated by installation and production restraints. The major detonation transfer variables studied were: explosive quanity, sensitivity, and thickness, and the separation distances between donor and acceptor explosives.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-2341
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    An Investigation to Improve Quality Evaluations of Primers and Propellant for 20mm Munitions (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: To reduce the frequency of electrically initiated, 20mm munition hangfires (delayed ignitions), a joint Army/NASA investigation was conducted to recommend quality evaluation improvements for acceptance of both primers and gun propellant. This effort focused only on evaluating ignition and combustion performance as potential causes of hangfires: poor electrical initiation of the primer, low output performance of the primer, low ignition sensitivity of the gun propellant, and the effects of cold temperature. The goal was to determine the "best" of the Army and NASA test methods to assess the functional performance of primers and gun propellants. The approach was to evaluate the performance of both high-quality and deliberately defective primers to challenge the sensitivity of test methods. In addition, the ignition sensitivity of different manufacturing batches of gun propellants was evaluated. The results of the investigation revealed that improvements can be made in functional evaluations that can assist in identifying and reducing ignition and performance variations. The "best" functional evaluation of primers and propellant is achieved through a combination of both Army and NASA test methods. Incorporating the recommendations offered in this report may provide for considerable savings in reducing the number of cartridge firings, while significantly lowering the rejection rate of primer, propellant and cartridge lots. The most probable causes for ignition and combustion-related hangfires were the lack of calcium silicide in the primer mix, a low output performance of primers, and finally, poor ignition sensitivity of gun propellant. Cold temperatures further reduce propellant ignition sensitivity, as well as reducing burn rate and chamber pressures.
    Keywords: Propellants and Fuels
    Type: Munitions Technology Symposium IV; Feb 10, 1997 - Feb 12, 1997; Reno, NV; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Detonation transfer understanding applied to aerospace problems (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Summary of the findings obtained from a two-year investigation aimed at a quantitative understanding of explosive stimulus transfer. It is felt that the improved understanding achieved on detonation transfer mechanisms will make possible better output tests and specifications, and should result in improved detonators and initiation methods.
    Keywords: PROPELLANTS
    Type: Symposium on Explosives and Pyrotechnics; Feb 05, 1974 - Feb 07, 1974; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Advanced emergency openings for commercial aircraft (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Explosively actuated openings in composite panels are proposed to enhance passenger survivability within commercial aircraft by providing improvements in emergency openings, fuselage venting, and fuel dump. The concept is to embed a tiny, highly stable explosive cord in the periphery of a load-carrying composite panel; on initiation of the cord, the panel is fractured to create a well-defined opening. The panel would be installed in the sides of the fuselage for passenger egress, in the top of the fuselage for smoke venting, and in the bottoms of the fuel cells for fuel dump. Described are the concerns with the use of explosive systems, safety improvements, advantages, experimental results, and recommended approach to gain acceptance and develop this concept.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA-TM-87580 , L-16012 , NAS 1.15:87580 , Corporate Aviation Safety Seminar; Apr 14, 1985 - Apr 16, 1985; Dallas, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Service-Life Extension of Explosive Escape Devices (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Chemical and functional tests yield conservative service-life estimates. Approach to extension of service lives of explosive devices in aircraft escape system developed, supported by testing of representative candidate devices to evaluate quantitatively effects of service, age, and degradation, and to enable responsible, conservative service-life determinations. Five types of explosive components evaluated: rigid and flexible explosive transfer lines; one-way transfers; flexible, linear-shaped charges; and initiation-handles. Extension of service in realistic manner provides both cost savings and increased system reliability.
    Keywords: MECHANICS
    Type: LAR-13462 , NASA Tech Briefs (ISSN 0145-319X); 11; 3; P. 48
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Extension of service life of rigid transfer lines /SMDC/ (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The results of a life evaluation program on rigid explosive transfer lines, which are used to initiate aircraft emergency crew escape functions, are presented in order to provide quantitative information on rigid explosive transfer lines which can contribute to responsible, conservative, service life determinations. The program involved the development of a test methodology, testing of the three types of transfer lines in use in the U.S., testing of these lines following a repeat of the thermal test conducted in the original qualification, and conducting a degradation investigation. Results from the testing of more than 800 components showed that rigid explosive transfer lines were not affected by age, service, or a repeat of the thermal qualification tests on full-service lines. The explosive degradation limits were approximated and the mechanisms examined. It is concluded that the service lives of rigid explosive transfer lines should be considered for extension in order to provide cost savings and increased system reliability.
    Keywords: PROPELLANTS AND FUELS
    Type: SAFE Association, Annual Symposium; Dec 06, 1982 - Dec 08, 1982; Las Vegas, NV
    Format: text
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    NASA TECHNICAL REPORTS
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