نتایج جستجو برای: changes inversely with frequency stockwell et al
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Season is the natural pattern of change in nature, which is related to the movement of the sun, the temperature cycle, the life cycle of the earth (phenology) and human culture. In astronomical and climatic seasons, a year divided into four seasons, spring, and summer, autumn and winter (Alsop, 2005), (Trenberth, 1983). Season is a period of the year with a homogeneous climate (Alsop, 1989), th...
In this paper, we investigate the use of the Stockwell Transform for image compression. The proposed technique uses the Discrete Orthogonal Stockwell Transform (DOST), an orthogonal version of the Discrete Stockwell Transform (DST). These mathematical transforms provide a multiresolution spatial-frequency representation of a signal or image. First, we give a brief introduction for the Stockwell...
this research concentrates on the lithostratigraphy, biostratigraphy, microfacies and sedimentary environment of the asmari and gachsaran formations at southwest firuzabad. the thickness of the studied section in all 608.95 meters that 220.8 meters belong to the asmari formation and 387.95 meters belong to the gachsaran formation (champe and mol members). in the study area, the asmari formation...
Diel vertical migrations are common among many aquatic species and are often associated with changing light levels. The underlying mechanisms are generally attributed to optimizing foraging efficiency or growth rates and avoiding predation risk (μ). The objectives of this study were to (1) assess seasonal and interannual changes in vertical migration patterns of three trophic levels in the Lake...
Head and neck cancer (HNC; including cancers of the oral cavity, oropharynx, hypopharynx, and larynx) is one of the most common cancers worldwide (Jemal et al., 2005). Various risk factors have been thought to be associated with HNC, including cigarette smoking (Stockwell and Lyman, 1986), heavy alcohol consumption (Pelucchi et al., 2008), and infection with human papillomavirus (HPV) (Fakhry a...
Graz University of Technology, Institute of Environmental Biotechnology, Petersgasse 12, A6 8010 Graz, Austria; Julius Kühn-Institut (JKI), Messeweg 11, D-38104 Braunschweig, 7 Germany, Kawanda Agricultural Research Institute, National Banana Research Program, 8 Uganda; Makerere University, Department of Agricultural Production, College of 9 Agricultural and Environmental Sciences, Uganda and B...
Since its appearing in 1996 [2], the Stockwell transform (S-transform) has been used as a tool in medical imaging, geophysics and signal processing in general. In this talk, we prove that the system of functions (so-called DOST basis), introduced by R. Stockwell in [3], is indeed an orthonormal basis of L2([0, 1]), which is a time-frequency localized basis, in the sense of Donoh-Stark Theorem [...
Time-frequency analysis is a powerful tool for signal analysis and processing. The Fourier transform and wavelet transforms are used extensively as is the Short-Time Fourier Transform (or Gabor transform). In 1996 the Stockwell transform was introduced to maintain the phase of the Fourier transform, while also providing the progressive resolution of the wavelet transform. The discrete orthonorm...
elso Arrais Rodriguesa,b,∗, Matheus Vescovi Gonçalvesa,c, aura Rosane Valério Ikomad, Irene Lorand-Metzee, André Domingues Pereirab, anielle Leão Cordeiro de Farias f, Maria de Lourdes Lopes Ferrari Chauffaillea,c, ony Schaffel g, Eduardo Flávio Oliveira Ribeiroh, Talita Silveira da Rochai,j, aleria Buccherik, Yuri Vasconcelos l, Vera Lúcia de Piratininga Figueiredom, arlos Sérgio Chiattone j,n...
summary based on the results of the analysis of site effects, mostly those with shear wave velocity and the fundamental period chosen as the basis for classification. in revision of earthquake resistant design regulations for buildings, classification of lands should be subject to the field conditions, geological, geotechnical, geophysical, and laboratory tests.in this context, the average shea...
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