957 research outputs found
Evaluation of fasteners and fastener materials for space vehicles
Testing of fasteners, bolts, rivets, and fastener materials - high temperature alloy
How does visuomotor priming differ for biological and non-biological stimuli? A review of the evidence
Determination of cardiac size from chest roentgenograms following Skylab missions
Decreased cardiothoracic transverse diameter ratios following Mercury, Gemini and Apollo space flights have been reported previously. To evaluate further changes in cardiac size, standard posteroanterior chest films in systole and diastole were obtained before flight and within a few hours after recovery on each of the Skylab astronauts. Postflight chest X-rays were visually compared to the preflight roentgenograms for possible changes in pulmonary vasculature, lung parenchyma, bony or soft tissue structures. From these roentgenograms the following measurements were obtained: cardiac and thoracic transverse diameters, cardiothoracic transverse diameter ratio, cardiac area from the product of both diagonal diameters, cardiac silhouette area by planimetry, thoracic cage area and cardiothoracic area ratio. The postflight frontal cardiac silhouette sizes were significantly decreased when compared with the respective preflight values (P0.05 or 0.01). The observed changes are thought to be related to postflight decrease in the intracardiac chamber volume
Comparison of Theoretical and Experimental Heat Transfer on a Cooled 20 Degrees Cone with a Laminar Boundary Layer at a Mach Number of 2.02
Beryllium fastener technology
Program was conducted to develop, produce, and test optimum-configuration, beryllium prestressed and blind fasteners. The program was carried out in four phases - phase 1, feasibility study, phase 2, development, phase 3, evaluation of beryllium alloys, and phase 4, fabrication and testing
The Change with Mass-flow Ratio of the Cowl Pressure Drag of Normal-shock Inlets at Supersonic Speeds
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