نتایج جستجو برای: transmitter
تعداد نتایج: 18487 فیلتر نتایج به سال:
This editorial comments on recent evidence concerning the roles in depression of the transmitter amines 5-hydroxytryptamine (5HT), dopamine (DA) and noradrenaline (NA). It focuses on evidence from brain chemistry and from effects of drugs used in treatment. The literature on urinary excretion of amine metabolites and on platelet erythrocyte and neuroendocrine abnormalities will not be discussed...
Transmitter diversity and down-link beamforming can be used in high-rate data wireless networks with orthogonal frequency division multiplexing (OFDM) for capacity improvement. In this paper, we compare the performance of delay, permutation and space–time coding transmitter diversity for high-rate packet data wireless networks using OFDM modulation. For these systems, relatively high block erro...
This editorial comments on recent evidence concerning the roles in depression of the transmitter amines 5-hydroxytryptamine (5HT), dopamine (DA) and noradrenaline (NA). It focuses on evidence from brain chemistry and from effects of drugs used in treatment. The literature on urinary excretion of amine metabolites and on platelet erythrocyte and neuroendocrine abnormalities will not be discussed...
there was a rapid development in wireless network area focusing on high speed and long range application. For this purpose Zigbee technology was developed. Zigbee based devices operates usually three bands i.e. 868 MHz, 915 MHz, and 2.4 GHz. This paper explore about several blocks of transmitter using VHDL. The transmitter consist of CRC(cyclic redundancy check), Bil-to-Symbol block, symbol-to-...
The mechanism of transmitter release by intracellular Ca has been explored by recording presynaptic Ca concentration ([Ca2+]i) with Ca-sensitive fluorescent dyes and by controlling [Ca2+]i with photosensitive Ca chelators. [Ca2+]i decays slowly (in seconds) after presynaptic action potentials, while transmitter release lasts only a few ms after each spike at fast synapses. Simulations of Ca dif...
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