نتایج جستجو برای: fading
تعداد نتایج: 19732 فیلتر نتایج به سال:
Coded modulation (usually with interleaving) is used in fading channel cornmunications to achieve good error performance. The major benefit froin using coded modulation in fading channels is achieved if each code symbol of a codeword (or coded sequence) suffers statistically different fading (preferably independent fading). However, in many applications of mobile communications (e.g. in a metro...
Fixational eye movements (FEMs; including microsaccades, drift and tremor) are thought to improve visibility during fixation by thwarting neural adaptation to unchanging stimuli, but how the different FEM types influence this process is a matter of debate. Attempts to answer this question have been hampered by the failure to distinguish between the prevention of fading (where fading is blocked ...
In this paper, the wireless system consisting of macrodiversity selection combining (SC) receiver and two microdiversity SC receivers under the influence of small scale fading and large scale fading, as well as co-channel interference is observed. Small scale fading has Weibull distribution. Correlated large scale fading is described by Gamma distribution. Co-channel interference is disturbed b...
Dry plate glass negatives are important part of the cultural, historical and visual heritage in history of Iran. Structural changes due to factors affected them over time, can cause deterioration in the image. Identifying deteriorations in dry plate glass negatives can help to provide better solutions in preserving them. The investigation of sample by Fourier transform infrared spectroscopy ...
In the present research influences of different combinations of five types of inoculants and four types of nodularizers on eutectic nucleation in ductile cast iron were studied. The alloys were kept at 1320°C for 0, 5, 10, 15 and 20 min under nitrogen atmosphere. Cooling curves and image analysis were used to characterize the influence of holding time and different combinations of inoculants an...
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