خواندن بعدی
Before the spread of the Internet, everyone dealt with letters and stamps. One of the pastimes of that time was to separate the stamp from the envelope and keep it. I also had a stamp album when I was a …
Below table lists the crystal structures of the pure metals at room temperature. In nearly every case the metal atoms pack into the simple crystal structures of face-centered cubic (FCC), body-centered cubic (BCC) or close-packed hexagonal (CPH or HCP) Some …
کانی آویسنیت (Avicennite) که نوعی اکسید تالیم است در سال ۱۹۵۸ میلادی کشف شد و به افتخار دانشمند ایرانی، پورسینا …
