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  • Gene Expression
  • Transcription factors (TFs) constitute a diverse class of sequence-specific DNA-binding proteins, which are key to the modulation of gene expression. (rsc.org)
  • synthesis
  • Therefore, it has become a hot topic in photocatalysis on the synthesis, photocatalytic characterization, and microstructure modulation of compositing semiconductor photocatalysts. (hindawi.com)
  • The special issue contains twenty-nine papers, which mainly focused on the synthesis, microstructure modulation, and practical applications of compositing semiconductor photocatalysts. (hindawi.com)
  • Signal
  • The changes in the carrier signal are chosen from a finite number of M alternative symbols (the modulation alphabet). (wikipedia.org)
  • Hierarchical modulation, also called layered modulation, is one of the signal processing techniques for multiplexing and modulating multiple data streams into one single symbol stream, where base-layer symbols and enhancement-layer symbols are synchronously overplayed before transmission. (wikipedia.org)
  • For a hierarchically-modulated symbol with QPSK base layer and 16QAM enhancement layer, the base-layer throughput loss is up to about 1.5bits/symbol with the total receive signal-to-noise ratio (SNR) at about 23 dB, about the minimum needed for the comparable non-hierarchical modulation, 64QAM. (wikipedia.org)
  • The modulation depth of each 90 Hz and 150 Hz signal changes according to the deviation of the aircraft from the correct position for the aircraft to touchdown on the threshold. (wikipedia.org)
  • The difference between the two signal modulation depths is zero when the aircraft is on the correct glideslope on approach to the runway-i.e. (wikipedia.org)
  • Video modulation is a strategy of transmitting video signal in the field of radio modulation and television technology. (wikipedia.org)
  • In general, video modulation means that a higher frequency carrier wave is modified according to the original video signal. (wikipedia.org)
  • Multidimensional modulation (MD modulation) is modifying or multiplying an MD signal (typically sinusoidal and referred to as the carrier signal) with another signal that carries some information or message. (wikipedia.org)
  • d\omega _{M}} Multidimensional AM or FM is AM-FM modulation where the a Multidimensional message signal is modulated (or multiplied) with a Multidimensional sinusoidal signal. (wikipedia.org)
  • In delta modulation there is a restriction on the amplitude of the input signal, because if the transmitted signal has a large derivative (abrupt changes) then the modulated signal can not follow the input signal and slope overload occurs. (wikipedia.org)
  • Constellation diagrams are used to examine the modulation in the 2-D signal space. (wikipedia.org)
  • In radio transmission, an advantage of frequency modulation is that it has a larger signal-to-noise ratio and therefore rejects radio frequency interference better than an equal power amplitude modulation (AM) signal. (wikipedia.org)
  • Efficiency
  • There are many application of video modulation: Broadcasting music and speech Two way radio systems (a radio that can both transmit and receive) Aircraft band (radio communication in civil aviation) Computer modems (a device that modulates Wi-Fi) These applications all utilized the efficiency of video modulation in order to minimize costs. (wikipedia.org)
  • Threshold
  • A theoretical analysis of threshold modulation in error diffusion is given. (spiedigitallibrary.org)
  • It is shown that spatial modulation of the threshold is mathematically identical to processing an equivalent input image with the standard error diffusion algorithm. (spiedigitallibrary.org)
  • The equivalent input is the sum of the original image with a high-pass-filtered version of the threshold spatial modulation. (spiedigitallibrary.org)
  • This result can be used to explain the several published observed effects of threshold modulation, such as edge enhancement and the effects of adding noise to the threshold. (spiedigitallibrary.org)
  • Keith T. Knox , Keith T. Knox, Reiner Eschbach , Reiner Eschbach, } "Threshold modulation in error diffusion," Journal of Electronic Imaging 2(3), (1 July 1993). (spiedigitallibrary.org)
  • An aircraft with an on-board ILS receiver within the capture area of an ILS, (glideslope and localizer range), will detect varying depths of modulation according to the aircraft's position within that airspace, providing accurate positional information about the progress to the threshold. (wikipedia.org)
  • waveforms
  • ADM provides robust performance in the presence of bit errors meaning error detection and correction are not typically used in an ADM radio design, it is very useful technique this allows fortive-delta-modulation Contemporary applications of Delta Modulation includes, but is not limited to, recreating legacy synthesizer waveforms. (wikipedia.org)
  • Cellular
  • Modulation of Oxidative Stress: Pharmaceutical and Pharmacological Aspects" is an annual special issue published in "Oxidative Medicine and Cellular Longevity. (hindawi.com)