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- W2526331362 abstract "Summary. In article features of definition of acoustic properties of polymers with application of ultrasonic fluctuations are considered. The opportunity of definition with single method of such parameters of quality as a relaxation spectra of polymer and function of molecular-mass distribution in a solution that results in increase in time of carrying out of measurements is shown. For reduction of time, may use narrowing of a range of frequencies of the ultrasonic fluctuations rendered on the measured sample, or increase the step of quantization of a registered signal with the oscillograph. Thus both variants result in reduction in reliability of the received information because of a possible extends for limits of an effective frequency range or loss of a high-frequency component of a registered signal at increase in a step of quantization. For the decision of the listed problems it is offered to use the complex harmonious signal being superposition of several signals. Frequency is necessary for choosing proceeding from sensitivity of each determined polymer parameter of quality. On concrete examples it is shown, that sensitivity of such parameters of quality as strength and viscosity on Mooney essentially depends on frequency. For initial research, in a case when properties of a material beforehand are not known and it is necessary to reveal effective ranges of frequencies, for each determined property of a material, it is offered to use a signal such as «white noise» which will allow to reveal ranges of frequencies with the greatest sensitivity each measured parameter of quality. That, it is in turn connected to uniform distribution of spectral making frequencies on all possible frequency range. Necessity for definition of an effective range of time of registration and a step of quantization for a kind of limitation of technical opportunities of means of registration of electric signals (oscillographs) is shown." @default.
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- W2526331362 date "2014-01-01" @default.
- W2526331362 modified "2023-09-27" @default.
- W2526331362 title "USING OF COMPLEX HARMONIOUS SIGNALS IN PROBLEMS OF ACOUSTIC SPECTROMETRY OF POLYMERS" @default.
- W2526331362 doi "https://doi.org/10.20914/2310-1202-2014-1-63-67" @default.
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