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A model of a late 19th-century Canadian seal used to certify the quality of assayed gold. A metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality. Some assay methods are suitable for raw materials; others are more appropriate for finished goods.
Ruthenium and rhodium are precious metals produced as a small percentage of the fission products from the nuclear fission of uranium.The longest half-lives of the radioisotopes of these elements generated by nuclear fission are 373.59 days for ruthenium and 45 days for rhodium [clarification needed].
The lunar gold rush is coming, space experts say, and it needs a fully functional Starship.. Leroy Chiao, a retired NASA astronaut who consulted for SpaceX on its Safety Advisory Panel for 12 ...
The European Space Agency working in 2013 with an independent architectural firm, tested a 3D-printed structure that could be constructed of lunar regolith for use as a Moon base. [94] [95] [96] 3D-printed lunar soil would provide both "radiation and temperature insulation. Inside, a lightweight pressurized inflatable with the same dome shape ...
This method has been used since ancient times. In modern times, additional tests can be done. The trace will react in different ways to specific concentrations of nitric acid or aqua regia, thereby identifying the quality of the gold: 24 karat gold is not affected but 14 karat gold will show chemical activity.
This is Mimas, the smallest of Saturn's major moons. Other than its giant impact crater, scientists thought Mimas was a rather boring piece of cold rock. Now, a new study says Mimas is much more ...
On History Channel's hit show "Pawn Stars," a man came in to sell a 1907 Saint-Gaudens double eagle $20 gold coin. The coins are extremely rare, and some of them have sold for more than $1 million ...
The brazen bull, also known as the bronze bull, Sicilian bull, Bellowing bull or bull of Phalaris, was a torture and execution device designed in ancient Greece. [1] According to Diodorus Siculus, recounting the story in Bibliotheca historica, Perilaus (Περίλαος) (or Perillus (Πέριλλος)) of Athens invented and proposed it to Phalaris, the tyrant of Akragas, Sicily, as a new ...