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In choosing materials of construction, we have to compromise between various factors. Use the acronym SHAMROCK to summarize and remember some of them. S = Safety: what are the consequences of failure? If they are serious, a more resistant material …
In below tables the elements are arranged by atomic number with the year of discovery and the discoverer. The discovery of an element made the discoverer well known and also gave credit to his/her country. Source: Encyclopedia of the Elements, …
Suppose you are going to do reverse engineering, that is, for example, you have a piece of unknown steel and …
کانی آرسنات آبدار کلسیم، منیزیم و باریم را باریان و هرپن در سال 1960 در معدن قدیمی تلمسی در کنار …
