696 research outputs found
Polyimide bonded graphite fluoride: A new long life solid lubricant coating
Solid lubricant film consisting of polyimide varnish as binder and graphite fluoride as lubricant is described. Comparative wear tests with other solid lubricants were conducted and results are shown in graph form. Test equipment used in conducting wear tests is reported
A new solid lubricant
Friction and wear life studies on burnished films of the compound graphite fluoride have demonstrated its potential as a solid lubricant material. It is effective in moist air, dry air, or in dry argon at temperatures up to approximately 400 degrees C
Preliminary investigation of graphite fluoride /CF sub x/ sub n as a solid lubricant
Friction and wear tests with graphite fluoride lubrican
Friction and wear behavior of graphite fiber reinforced polymide composites
The friction and wear rate characteristics of 50/50 (weight percent) graphite fiber polyimide composites were studied by sliding metallic hemispherically tipped riders against disks made from the composites. Two different polyimides and two different graphite fibers were evaluated. Also studied were such variables as the effect of moisture in an air atmosphere; the effect of temperature; and the effect of different sliding speeds. In general, wear to the the metallic riders was negligible, and composite wear increased at a constant rate as a function of number of sliding cycles
Activité de recherche du Centre d'expérimentation agricole et forestière (Rome) sur le pin d'Alep
Les activités de recherche du pin d'Alep qui sont actuellement en cours dans l'Institut et qui s'étendent à un domaine d'enquête particulièrement vaste va de l'amélioration génétique aux tests de culture intensive
Life-Cycle Cost Estimation for High-Speed Vehicles: from the engineers’ to the airline’s perspective
This paper aims at upgrading the holistic Cost Estimation methodology for High-Speed
Vehicles already developed by Politecnico di Torino and the European Space Agency (ESA)
to encompass different stakeholders’ perspectives. In details, the presented methodology
combines International Air Transport Association (IATA) best practices with a detailed Life-
Cycle Cost (LCC) assessment, which includes the evaluation of Research, Development, Test
and Evaluation (RDTE) Costs, Production costs and of Direct and Indirect Operating Costs
(DOC and IOC). The integrated approach allows to further extend the capabilities of the inhouse
developed HyCost tool to support all the actors of the product value-chain (including
engineers, manufacturers, airlines and customers) in assessing the economic sustainability of
a newly under-development high-speed vehicle. However, considering the need of providing
all these cost analyses perspectives since the early design stages, the derived Cost Estimation
Relationships are mainly derived on statistical bases. To cope with the uncertainties that affect
the initial statistical population and consequently, the CERs, this paper presents each cost
item together with the estimation of related prediction intervals. Finally, results of the
application of the upgraded cost estimation methodology and of the upgraded tool to the
LAPCAT MR2.4 high-speed civil transport are reported and discussed
Valorisation productive de zones dégradées à l'aide de plantations forestières : un exemple d'expérimentation en Sardaigne.
Décrit des interventions expérimentales réalisées en 1986-87 en Sardaigne afin de : - identifier les espèces forestières appropriées - mettre au point des techniques de préparation appropriées
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