In order to improve the low probability of interception, one suitable way is to make the spectrum of FH channels be hidden in the spectrum of radar radiation on purpose.
Despite that, by exclusion, the hemicellulose signals can be identified, including lines 1 and 17, which are clearly visible in the untreated bagasse spectra, and also signals at 63, 73.2, 102.6, 107.8 and 159.4 ppm, which were hidden in the spectrum of the untreated sugarcane bagasse [ 4].
Tsrrneo Nitta used multiple mapping operators to extract topological structures, hidden in time spectrum patterns.
Spread spectrum technique spreads hidden data through the frequency spectrum.
But as well as this air pollution that encompasses our cities, hidden from our visual spectrum is vast amounts of "electrosmog".
Second, fluorescence of impurities or of the sample itself can hide the Raman spectrum.
Authors in [10] study the problem of heterogeneous coexistence between TDM and CSMA networks in TV White Space (TVWS) spectrum and address hidden terminal problem with a beacon transmission mechanism.
Nevertheless, confusion has arisen because it has been suggested that (an altered) signal N1a is hidden by N1b in the spectra from the NADH-reduced mitochondrial enzymes (suggesting that the 2Fe[24] cluster can be reduced by NADH).
In addition, the organisation incorporates a fleet of Spectrum Pursuit Vehicles (SPV) hidden in secret locations around the world.
In experiments it is a more difficult problem, since the overtone can be hidden behind other peaks in the spectrum or because the overtone process are energetically close to another fundamental mode making it difficult to know which vibrational modes are observed in the IET spectrum.
