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Normal flight (above), Deep stall condition - T-tail in "shadow" of wing (below) A Schweizer SGS 1-36 being used for deep-stall research by NASA over the Mojave Desert in 1983. A deep stall (or super-stall) is a dangerous type of stall that affects certain aircraft designs, notably jet aircraft with a T-tail configuration and rear-mounted ...
The flat bottom simplifies angle measurements on propellers, and makes for easy construction of wings. For many applications the Clark Y has been an adequate airfoil section; it gives reasonable overall performance in respect of its lift-to-drag ratio, and has gentle and relatively benign stall characteristics. The flat lower surface is not ...
The ocean reservoir contains an estimated 5.6x10 9 Mg of gold and oceanic gold concentration is about 4 ng Au/L with higher values in some coastal waters. [1] Au(I/III)-ions and Au(0)-colloids are unstable under surface conditions in aqueous solutions and commonly form ligand complexes with substances excreted by microorganisms. [3]
[1] [3] The color of the wings may indicate the type of ore it eats, golden if from a gold mine and silvery if from a silver mine. [2] [1] [3] Some descriptions also portray the color of the wings as copper-green. [1] Also the cave-dwelling alicanto female will lay just two eggs, of gold or silver, depending on the ore it feeds on (lore of ...
A variety of gold deposits are formed in accretionary orogens, including orogenic gold deposits. [38] Orogenic gold deposits are typically located in metamorphosed fore-arc and back-arc regions, as well as in the arc [3] and show a close spatial relationship to lamprophyres and associated felsic porphyry dikes and sills. [39]
The desert spans just over 9 million square kilometers, from the Atlantic Ocean to the Red Sea, from the Mediterranean Sea to the Niger River valley and the Sudan region in the south. [ 1 ] The Sahara is the largest source of aeolian dust in the world, with annual production rates of about 400-700 x 10 6 tons/year, which is almost half of all ...
Hawaiian gold corals display an interesting growth mechanism, spreading at a rate of about 2.2 ± 0.69 cm yr−1 cm per year. [3] Radiocarbon dating has been used to determine the radial growth rate of K.haumeaae which exhibits a relatively slow radial growth rate with a remarkable age of 807 ± 30 years for a live-collected specimen, highlighting the species' exceptional longevity. [4]
Targets for mineral exploration have been identified throughout the stratigraphic column. Metamorphic complexes host a variety of prospective environments such as copper-molybdenum porphyry, volcanic base metals and gold, volcanogenic copper, sedimentary lead and zinc, fluorite, shear zone gold, and beryllium-niobium-tantalum mineralization.