نتایج جستجو برای: frequency effect
تعداد نتایج: 2059493 فیلتر نتایج به سال:
In radio frequency identification (RFID) systems, if tags transmit their IDs simultaneously, a reader cannot correctly identify the IDs due to collision and the performance of RFID systems degrades by the collision. So, anti-collision protocols to reduce the number of collisions are required. The binary tree anti-collision protocol branches randomly in a tree to reduce collisions in the next id...
In this study, we use hierarchical modulation technology to estimate the carrier frequency offset (CFO) caused by the Doppler effect; and hierarchical modulation has been implemented in the orthogonal frequency-division multiplexing (OFDM) system. Different threshold levels have been used to demodulate various bits of the hierarchical modulated symbols and it has the characteristic that the bit...
background and aim: it has been several decades since the technology of frequency lowering (fl) has been proposed. however, primary research has revealed no benefits regarding the use of this technique. currently, new methods for fl and improvement of perception of speech and fricative sounds have led to the application of these methods by numerous companies to produce hearing aids. in this stu...
abstract: advertisements are the most accessible type of authentic materials, and this is one reason why they are used more and more in english teaching classes. for this cause, studies in the field of advertisements are very widespread nowadays. for pun is one aspect which makes advertisements more interesting, it is used more than before in advertisements. use of puns makes an advertisement m...
this study attempted to explore if teaching english collocations through two different modes of awareness-raising and input flooding has any possible differential effect on immediate retention as well as retention in a delayed assessment. it also compared the possible differential effect of teaching english collocations implicitly and explicitly on actively using the items in writing. m...
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