منابع مشابه
Measuring fundamental frequencies in local field potentials.
Neural processes display rhythmic oscillations in local field potentials; identification of their characteristic frequencies is complicated due to their highly non-stationary nature. A simple technique, combining Fourier transforms and correlation coefficients yields unambiguous determinations of the frequencies without a priori filtering. This procedure also provides quantitative information c...
متن کاملEstimating Fundamental Frequencies of Tall Buildings
Empirical estimates of the fundamental frequency of tall buildings vary inversely with their height, a dependency not exhibited by the various familiar models of beam behavior. This paper examines and explains this apparent discrepancy by analyzing the consequences of using two models to estimate such natural frequencies: A two-beam model that couples the bending of a classical cantilever to th...
متن کاملSTUDY ON THE FUNDAMENTAL FREQUENCIES OF RECTANGULAR CONCRETE TANKS USING FEM AND ANALYTICAL CODES
Impulsive and convective frequencies are one of the most important subjects for evaluation of the seismic behavior of tanks. These two frequencies are defined by Housner and used for obtaining Rayleigh damping in time history analysis. ACI 350 and NZSEE standards have suggested some analytical solutions for finding convective and impulsive frequencies. These frequencies can also extract from mo...
متن کاملStudy on Fundamental Frequencies of Cylindrical Storage Tanks Obtained from Codes and Finite Element Method
In the case of study on the seismic behavior of tanks, one of the most important subjects is selection of convective and impulsive frequencies for storage tanks. These two frequencies are defined by Housner. The major utility of these frequencies is for Rayleigh damping which is a must for time history analysis. API 650, EUROCODE 8 have suggested some analytical solutions for finding convective...
متن کاملVowel identification at high fundamental frequencies in word context
The question of vowel intelligibility as a function of F0 is still a matter of debate. Above all concerning vowel sounds produced at F0s exceeding vowelrelated statistical F1 in citation-form words (‘oversinging’ F1), it is unclear whether vowel category perception inevitably shifts towards the neighboring category with a higher F1 or can be maintained in such cases. In this study, we tested li...
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ژورنال
عنوان ژورنال: Nature
سال: 1926
ISSN: 0028-0836,1476-4687
DOI: 10.1038/117194a0