Golestān Palace is the remnant of the historic citadel of Tehran, which dates back to the Safavid period, and the Zandiyeh and Fatḥ-Ali Shah Qajar. But because of extensive repairs by Nasser al-Din Shah in 1905, most of the buildings in this complex are regarded to be from the Nasseri era. Golestān Palace was the residence of the Qajar kings and the country’s administrative heart whose architec...

a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...

the ability to speak two languages in the world is a remarkable achievement. there is a good reason to believe that bilingualism is the norm for the majority of people in the world because 70% of the earth’s population are supposed to be bilingual or multilingual. various investigations have shown that the native language impacts foreign word recognition, and this influence is adapted by the de...