Results 81 to 90 of about 8,867 (283)
Aerospace medicine and biology: A continuing bibliography with indexes (supplement 335) [PDF]
This bibliography lists 143 reports, articles and other documents introduced into the NASA Scientific and Technical Information System during March, 1990.
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Hypothesis about Enrichment of Solar System
, 2020 Despite significant progress in the understanding of galactic nucleosynthesis and its influence on the solar system neighborhood, challenges remain in the understanding of enrichment of the solar system itself.
Pavlov, V. I., Tito, E. P.
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Journal of Polymer Science, EarlyView.This study presents a fast and accurate calculation tool to predict conveying of polymer melts in single‐screw extruders. Integrating generalized sub‐models into network theory allows to represent the complex screw shapes and material behavior more realistically. Tests on an industrial extruder show close agreement with experiments, outperforming older
Daniel Herzog +3 more
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Space Station medical sciences concepts [PDF]
Current life sciences concepts relating to Space Station are presented including the following: research, extravehicular activity, biobehavioral considerations, medical care, maintenance of dental health, maintaining health through physical conditioning ...
Johnson, P. C., Jr., Mason, J. A.
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Gas Giant Protoplanets Formed by Disk Instability in Binary Star Systems
, 2005 We present a suite of three dimensional radiative gravitational hydrodynamics models suggesting that binary stars may be quite capable of forming planetary systems similar to our own.
A. P. Boss +4 more
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Propellants, Explosives, Pyrotechnics, EarlyView.This study presents an alternative method to manufacture polymer‐bonded explosives by partially curing an HTPB‐based molding powder prior to compaction. The study shows that the length of partial cure time before compaction directly influenced the geometric fidelity, homogeneity, compressive strength, density, and internal microstructure.
Ismar L. Chew +4 more
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Pre‐failure behavior of continuous post‐tensioned and post‐grouted beam in case of tendon failure
Structural Concrete, EarlyView.Abstract Grouted tendons are a common solution for long‐span bridge structures. The grout provides bond and corrosion protection for prestressing steel. However, if the grouting is defective, corrosion of the prestressing steel may initiate and eventually lead to tendon failure.
Olli Asp +2 more
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A rare case of isolated retro-orbital fungal granuloma
Apollo Medicine, 2018 We report here the first case of retro-orbital fungal granuloma caused by Aspergillus versicolor. A 52-year-old male presented with protrusion of left eye associated with pain in the left eye and watering of the left eye for 6 months duration.
Ramiya Ramachran Kaipuzha +3 more
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Structural Concrete, EarlyView.Abstract Steel fiber reinforced concrete (SFRC) enhances the flexural capacity of flat slabs and, due to its effectiveness in statically redundant bi‐dimensional elements, represents a viable alternative to conventional reinforcement. Although numerous studies have investigated the flexural behavior of SFRC slabs with and without bonded reinforcement ...
Chiara Gaddi +2 more
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Materials SIG quantification and characterization of surface contaminants [PDF]
When LDEF entered orbit its cleanliness was approximately a MIL-STD-1246B Level 2000C. Its burden of contaminants included particles from every part of its history including a relatively small contribution from the shuttle bay itself.
Crutcher, E. Russ
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