Noise reduction by support vector regression with a Ricker wavelet kernel

An online surface water COD measurement method based on multi-source spectral feature-level fusion

“…3,6,7 With regards to the technology based on spectrophotometry, many scientists use the UV-Vis absorbance at 254 nm wavelength as an input, due to the strong linear correlation with organic content and the absorbance at 254 nm under ideal conditions. 8 However, the UV-Vis absorbance at 254 nm can easily be inuenced by scattering, which can cause a signicant deviation and raise the degree of uncertainty in the obtained result. Thus, some scientists have considered UV-Vis absorbance at other wavelengths, such as 350 and 465 nm, as a second input to establish an improved measurement model in order to compensate the inuence from scattering.…”

Trace-transform-based time-frequency filtering for seismic signal enhancement in Northeast China

“…In Northeast China, countermeasures are hard to apply due to the complex geology (which leads to complicated coherent noise), and to severe winter storms for more than 5 months a year (which leads primarily to powerful random noise). Therefore, many available methods (Deng et al, 2010(Deng et al, , 2011Naghizadeh and Sacchi, 2009;Satish and Nazneen, 2003) do not produce satisfactory results. Time-frequency peak filtering (TFPF) and its extension in the temporal and spatial domain would be a good choice (Lin et al, 2007) to eliminate the strong random noise.…”