Ancient Artifacts that Challenge Modern Archaeological …
THAT CHALLENGE MODERN THINKING THE ANTIKYTHERA MECHANISM Dated to 80 A.D, probably used as calendar and astronomical calculator for the motions of stars and planets. It is very sophistied device that consists of 30 toothed wheels, of diameter from 9 to 132 mm, being able to rotate at a different speed each, dials and scaled metal plates with inscriptions related to the signs of zodiac
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Calcium sulfate precipitation pathways in natural and …
30/12/2019· Calcium sulfate is the dominant terrestrial sulfate and can be found in a wide range of environments. Large (marine) sulfate evaporitic deposits have been forming since the great oxidation event in the Paleoproterozoic (e.g. Babel and Schreiber, 2014; reports of gypsum precipitation during the Archean, e.g. Buick and Dunlop (1990), are still debated (e.g. Warren, 2006)).
Effect of struvite and organic acids on immobilization of …
The SEM images, FT-IR spectra and particle size distributions of the two struvite types are presented in Fig. 1 below. As shown in Fig. 1, it can be seen that Str1 has rod-like crystals while Str2 has crystals with irregular shapes and sizes, and their surfaces were covered with small particles due to the presence of calcium ions in the initial solution.
Antimony - Wikipedia
Antimony has two stable isotopes: 121 Sb with a natural abundance of 57.36% and 123 Sb with a natural abundance of 42.64%.It also has 35 radioisotopes, of which the longest-lived is 125 Sb with a half-life of 2.75 years. In addition, 29 metastable states have been characterized. states have been characterized.
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Titanium - Wikipedia
Titanium is a chemical element with the syol Ti and atomic nuer 22. It is a lustrous transition metal with a silver color, low density, and high strength. Titanium is resistant to corrosion in sea water, aqua regia, and chlorine.Titanium was discovered in Cornwall, Great Britain, by William Gregor in 1791 and was named by Martin Heinrich Klaproth after the Titans of Greek mythology.
During a study of ureolytic microbial calcium carbonate (CaCO3) precipitation by bacterial isolates collected from different environmental samples, morphological differences were observed in the large CaCO3 crystal aggregates precipitated within bacterial colonies grown on agar. Based on these differences, 12 isolates were selected for further study. We hypothesized that the striking
Gravel road - Wikipedia
Characteristics Construction Compared to sealed roads, which require large machinery to work and pour concrete or to lay and smooth a bitumen-based surface, gravel roads are easy and cheap to build.However, compared to dirt roads, all-weather gravel highways are quite expensive to build, as they require front loaders, dump trucks, graders, and roadrollers to provide a base course of compacted
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Metal Weight Calculator Grade of Raw Material Select Aluminium Brass IS 319 Carbon Steel Cast Iron Copper EN-19 EN-1A EN-24 EN-8D EPDM Rubber Fe 11 Fe 12 Fe 24 Hestalloy C-276 Inconel 600 Inconel 610 Inconel 625 Mild Steel Natural Rubber SBR Rubber Silver SS 201 SS 300 Series SS 303 SS 304 SS 304L SS 308 SS 309 SS 309L SS 310 SS 316 SS 316L SS 321 SS 400 Series SS 410 SS …
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Welding Consumables - Part 2 - TWI
In addition to the limestone there may be up to 30% of calcium fluoride (CaF 2) added to lower the melting point of the limestone and to reduce its oxidising effect. Also deoxidants such as ferro-manganese, ferro-silicon and ferro-titanium are added to provide de-oxidation of the weld pool.