Results 141 to 150 of about 19,469 (232)
Chemistry: Space resources for teachers including suggestions for classroom activities and laboratory experiments [PDF]
, 1971 Curriculum supplement to assist general chemistry teachers in updating instruction materials with aerospace ...
Bowman, W. H., Lawrence, R. M.
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Scandinavian Journal of Medicine &Science in Sports, Volume 36, Issue 2, February 2026.ABSTRACT Elite performance in Olympic winter sports depends on the interplay among the athlete, equipment, and the snow or ice. This naturally evolves with temperature, humidity, wind, preparation, and contact between the equipment and its surface. Together, these factors continuously rebalance the forces of gravity, aerodynamic drag, and friction ...
Andreas Almqvist +4 more
wiley +1 more source
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 2, 28 January 2026.Abstract Line‐shaped contrails formed behind aircraft can evolve into broadly spread and long‐living cirrus clouds under favorable conditions. These contrail‐cirrus contribute significantly to the aviation‐induced radiative forcing. While past modeling studies have examined contrail‐cirrus across various atmospheric and aircraft‐type dependent ...
Annemarie Lottermoser +1 more
wiley +1 more source
Endurance and failure characteristics of main-shaft jet engine bearings at 3x10 to the 6th power DN [PDF]
Groups of thirty 120-mm bore angular contact ball bearings were endurance tested at a speed of 12,000 and 25,000 rpm and a thrust load of 66 721 N. The bearings were manufactured from a single heat of VIM-VAR AISI M-50 steel.
Bamberger, E. N. +2 more
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Sensitivity Analysis of Transportation Production Costs in Indonesia [PDF]
, 2008 The transportation production cost (TPC) considerably has strong influence to the national economic condition. This paper focused on the analysis of the transportation production cost sensitivity in relation to the variation of the external affecting ...
Armijaya, H. (Henry) +3 more
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Predicted and experimental performance of jet-lubricated 120-millimeter-bore ball bearings operating to 2.5 million DN [PDF]
Bearing inner- and outer-race temperatures and friction power losses were calculated using two computer programs. The values obtained were compared with previously reported experimental data for 120 mm bore bearings which operated at thrust loads to 22 ...
Coe, H. H., Zaretsky, E. V.
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Spur-Gear-System Efficiency at Part and Full Load [PDF]
A simple method for predicting the part- and full-load power loss of a steel spur gearset of arbitrary geometry supported by ball bearings is described. The analysis algebraically accounts for losses due to gear sliding, rolling traction, and windage in ...
Anderson, N. E., Loewenthal, S. H.
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The Helios mechanical despin drive assembly for the high-gain antenna reflector [PDF]
, 1976 Helios is the German-American solar probe which comes within 0.31 Astronomical Units of the sun. A special thermal design and a dry lubrication system have resulted in successful operation up to now, with Helios having finished its first orbit around the
Mueller, E. J. W.
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Supersonic transport lubrication system investigation, phase 2 Periodical report [PDF]
Evaluation tests of ball bearings, face seals, and lubricants for use on Mach 3 aircraft gas turbine engine ...
Rhoads, W. L.
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Comparison of spur gear efficiency prediction methods [PDF]
The predictions of five spur-gear efficiency calculation methods were compared with three sets of test data using different gear geometries. The data and the analysis methods were limited to jet lubricated, ground, spur gears. The data covered a range in
Anderson, N. E., Loewenthal, S. H.
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