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  • SPACECRAFT PROPULSION AND POWER  (16)
  • MECHANICAL ENGINEERING  (3)
  • Populus deltoides  (3)
  • 1985-1989  (22)
  • 1940-1944
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 47 (1988), S. 167-172 
    ISSN: 1570-7458
    Keywords: feeding behavior ; leaf center or edge feeders ; chemical signals ; trial design ; Plagiodera versicolora ; Populus deltoides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Plagiodera versicolora Laich (Coléo., Chrysomelidae) a préféré significativement consommer les grandes rondelles (diamètre 17 mm) de Populus deltoides préalablement exposées à l'ozone ambiant, aux témoins exposés à de l'air filtré sur charbon de bois. Cependant, quand le diamètre a été réduit à 10 mm, les insectes n'ont plus préféré les feuilles soumises à l'ozone. Les préférences alimentaires de cet insecte consommant le centre des feuilles ont probablement changé parceque les signaux chimiques de la coupure ont surpassé ou masqué ceux des petits disques. Ainsi, le rapport périmètre sur surface du disque est un critère important de la procédure expérimentale. L'influence de la taille du disque dépend vraisemblablement du fait que l'insecte consomme le centre ou la pourtour de la feuille, de la taille de l'insecte et du type d'expérience. Nous en avons déduit que l'effet de la taille du disque est fréquent particulièrement chez les insectes consommant le centre des feuilles. Les modificatons du choix des insectes lorsque les plantes avaient été présentées sous forme de rondelles au lieu de feuilles ou plantes entières, peuvent être expliqués aussi par le changement des signaux provoqué par le découpage des rondelles, plutôt que par l'induction de modifications chimiques dues à la cueillette, comme cela a été précédemment indiqué par différents auteurs. Par ailleurs, dans les conditions naturelles, des changements dans les signaux chimiques des feuilles dus à une consommation antérieure par des insectes, peuvent être aussi importants dans le comportement alimentaire des insectes que n'importe quel changement chimique induit dans les feuilles par les dégâts.
    Notes: Abstract The size of cottonwood (Populus deltoides L. Bartr.) leaf discs used in insect feeding preference trials with the chrysomelid beetle, Plagiodera versicoloraLaich., was shown to affect behavior, and the outcome of the feeding trial. It is suggested that disc size has an effect because it alters the ratio of chemical signals from the cut leaf edge to those of the intact leaf center. The implications of this finding to the design of bioassays; to previously noted differences in feeding behavior for insects on discs versus leaves; and to the study of feeding preference and induction of plant defense are discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 76 (1988), S. 57-61 
    ISSN: 1432-1939
    Keywords: Plagiodera versicolora ; Plant stress ; Populus deltoides ; Ozone effects ; Insect fitness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Leaf area consumption rates, development rates, survivorship, and fecundity of the imported willow leaf beetle (Plagiodera versicolora Laich) were examined on two clones of eastern cottonwood which were previously exposed to ozone or charcoal-filtered air. P. versicolora consumed more ozone treated foliage, but were more fecund when reared on charcoal-filtered air treated plants. Beetle development rates and survivorship were not significantly different on treated and control cottonwoods. We concluded that: 1) Ozone fumigation of cottonwood reduced foliage quality, and the reproductive success and overall performance of P. versicolora. 2) increased foliage consumption by beetles was probably a mechanism compensating for decreases in foliage quality. 3) Reductions in beetle fecundity were due to an initial reduction in oviposition rates. 4) Beetle feeding preference did not correlate with the suitability of foliage for beetle performance. These results are discussed in relation to the impact of air pollution on plant-insect interactions.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1939
    Keywords: Plagiodera versicolora ; Populus deltoides ; Clones ; Damage distribution ; Community structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Adults and larvae of the beetle Plagiodera versicolora preferred to feed on and consumed more of cottonwood, Populus deltoides, plant material that had been previously exposed to an acute dose of ozone (0.20 ppm, 5 h), compared to controls in choice experiments. However, females preferred to oviposit on the unexposed controls. Results were consistent for 2 cottonwood clones over 3 years in disc, leaf and whole-plant choice tests. The differential feeding and oviposition response of this insect to stressed plants could have at least 3 unexpected consequences: 1. An immediate increase in damage to stressed trees, but a subsequent decrease in damage. 2. A subsequent increase in damage to unstressed adjacent trees. 3. Changes in the insect and pathogen communities of both stressed and unstressed trees. These complex scenarios show that predicting outcomes of plant stress on plant-insect interactions will require comprchensive examination of behavioral, growth and reproductive responses of insects to stressed plants.
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  • 4
    Publication Date: 2011-08-19
    Description: Two propulsion systems have been selected for the Space Station: O/H rockets for high thrust applications and the multipropellant resistojets for low thrust needs. These thruster systems integrate very well with the fluid systems on the station. Both thrusters will utilize waste fluids as their source of propellant. The O/H rocket will be fueled by electrolyzed water and the resistojets will use stored waste gases from the environmental control system and the various laboratories. This paper presents the results of experimental efforts with O/H and resistojet thrusters to determine their performance and life capability.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Acta Astronautica (ISSN 0094-5765); 15; 673-683
    Format: text
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  • 5
    Publication Date: 2011-08-19
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 5; 534-547
    Format: text
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  • 6
    Publication Date: 2011-08-19
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 5; 197-203
    Format: text
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  • 7
    Publication Date: 2019-06-28
    Description: The selection of a propulsion system for a man-tended platform has been influenced by the planned use of resistojets for drag make-up on the manned space station. For that application a resistojet has been designed that is capable of operation with a wide variety of propellants, including water. The reasons for the selection of water as the propellant and the performance of water as a propellant are discussed. The man-tended platform and its mission requirements are described.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-100110 , E-3649 , NAS 1.15:100110 , IAF-87-259
    Format: application/pdf
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  • 8
    Publication Date: 2019-06-28
    Description: The technological readiness of a long-life multipropellant resistojet for space station auxiliary propulsion is demonstrated. A laboratory model resistojet made from grain-stabilized platinum served as a test bed to evaluate the design characteristics, fabrication methods, and operating strategies for an engineering model multipropellant resistojet developed under contract by the Rocketdyne Division of Rockwell International and Technion Incorporated. The laboratory model thruster was subjected to a 2000-hr, 2400-thermal-cycle endurance test using carbon dioxide propellant. Maximum thruster temperatures were approximately 1400 C. The post-test analyses of the laboratory model thruster included an investigation of component microstructures. Significant observations from the laboratory model thruster are discussed as they relate to the design of the engineering model thruster.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-89854 , E-3521 , NAS 1.15:89854 , AIAA PAPER 87-0993
    Format: application/pdf
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  • 9
    Publication Date: 2019-06-28
    Description: Two propulsion systems have been selected for the space station: O/H rockets for high thrust applications and the multipropellant resistojets for low thrust needs. These thruster systems integrate very well with the fluid systems on the station. Both thrusters will utilize waste fluids as their source of propellant. The O/H rocket will be fueled by electrolyzed water and the resistojets will use stored waste gases from the environmental control system and the various laboratories. This paper presents the results of experimental efforts with O/H and resistojet thrusters to determine their performance and life capability.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-100108 , E-3648 , NAS 1.15:100108
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  • 10
    Publication Date: 2019-06-28
    Description: A self contained, single use hose and tubing cleaning module which utilizes available water supplies without requiring access to precision cleaning facilities is presented. The module is attached to the water source at the inlet side and to the hose or tubing to be cleaned at the outlet side. The water flows through a water purification zone, a detergent dispensing zone, a filtration zone before the detergent laden water flows into the tubing to clean the tubing walls. The module contains an embedded pad which is impregnated with a pH indicator to indicate to the user when the detergent has dissolved and rinsing of the tubing begins.
    Keywords: MECHANICAL ENGINEERING
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