The Mach number, often only Mach, is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. It is named after the Austrian physicist and philosopher Ernst Mach.
Inconel is a nickel-chromium-based superalloy often utilized in extreme environments where components are subjected to high temperature, pressure or mechanical loads. Inconel alloys are oxidation- and corrosion-resistant, when heated, Inconel forms a thick, stable, passivating oxide layer protecting the surface from further attack. Inconel retains strength over a wide temperature range, attractive for high-temperature applications where aluminum and steel would succumb to creep as a result of thermally-induced crystal vacancies. Inconel's high-temperature strength is developed by solid solution strengthening or precipitation hardening, depending on the alloy.
Titanium aluminide, commonly gamma titanium, is an intermetallic chemical compound. It is lightweight and resistant to oxidation and heat, but has low ductility. The density of γ-TiAl is about 4.0 g/cm3. It finds use in several applications including aircraft, jet engines, sporting equipment and automobiles. The development of TiAl based alloys began circa 1970. The alloys have been used in these applications only since about 2000.
Barium fluoride is an inorganic compound with the formula BaF2. It is a colorless solid that occurs in nature as the rare mineral frankdicksonite. Under standard conditions it adopts the fluorite structure and at high pressure the PbCl2 structure. Like CaF2, it is resilient to and insoluble in water.
Deinococcus is in the monotypic family Deinococcaceae, and one genus of three in the order Deinococcales of the bacterial phylum Deinococcota highly resistant to environmental hazards. These bacteria have thick cell walls that give them Gram-positive stains, but they include a second membrane and so are closer in structure to Gram-negative bacteria. Deinococcus survive when their DNA is exposed to high doses of gamma and UV radiation. Whereas other bacteria change their structure in the presence of radiation, such as by forming endospores, Deinococcus tolerate it without changing their cellular form and do not retreat into a hardened structure. They are also characterized by the presence of the carotenoid pigment deinoxanthin that give them their pink color. They are usually isolated according to these two criteria. In August 2020, scientists reported that bacteria from Earth, particularly Deinococcus bacteria, were found to survive for three years in outer space, based on studies conducted on the International Space Station. These findings support the notion of panspermia, the hypothesis that life exists throughout the Universe, distributed in various ways, including space dust, meteoroids, asteroids, comets, planetoids or contaminated spacecraft.
Thermococcus gammatolerans is an archaea extremophile and the most radiation-resistant organism known to exist.
Margaretbarromyces is an extinct monotypic genus of pleosporale fungus of uncertain family placement. At present it contains the single species Margaretbarromyces dictyosporus.
Geodermatophilus africanus is a Gram-positive, aerobic and halotolerant bacterium from the genus Geodermatophilus which has been isolated from desert sand near Ourba in the Sahara.
Geodermatophilus amargosae is a Gram-positive and aerobic bacterium from the genus Geodermatophilus which has been isolated from desert soil from the Amargosa Desert in the United States.
Geodermatophilus aquaeductus is a Gram-positive, aerobic and gamma-ray resistant bacterium from the genus Geodermatophilus which has been isolated from the surface of a calcarenite stone from the ruins of the Aqueduct of Hadrian in Tunisia.
Geodermatophilus arenarius is a Gram-positive, aerobic and xerophilic bacterium from the genus Geodermatophilus which has been isolated from desert sand from Ouré Cassoni in Chad.
Geodermatophilus bullaregiensis is an aerobic bacterium from the genus Geodermatophilus which has been isolated from the surface of a marble monument from Bulla Regia in Tunisia.
Geodermatophilus normandii is a Gram-positive bacterium from the genus Geodermatophilus which has been isolated from desert sand from Ouré Cassoni in Chad.
Geodermatophilus poikilotrophus is a Gram-positive and aerobic bacterium from the genus Geodermatophilus which has been isolated from dolomitic marble from Samara in Namibia.
Geodermatophilus pulveris is a gamma-ray resistant and aerobic bacterium from the genus Geodermatophilus which has been isolated from limestone dust from Grand Erg Oriental in Tunisia.
Geodermatophilus saharensis is a Gram-positive and aerobic bacterium from the genus Geodermatophilus which has been isolated from desert sand from Ouré Cassoni in Chad.
Geodermatophilus siccatus is a Gram-positive and aerobic bacterium from the genus Geodermatophilus which has been isolated from arid sand near Ourba in Chad.
Geodermatophilus telluris is a Gram-positive and aerobic bacterium from the genus Geodermatophilus which has been isolated from arid sand near Vers Ourba in Chad.
Geodermatophilus tzadiensis is a Gram-positive, aerobic and UV radiation-resistant bacterium from the genus Geodermatophilus which has been isolated from desert sand near Ouré Cassoni in Chad.
Geodermatophilus is a Gram-positive genus of bacteria from the phylum Actinomycetota.
