Autor: Barczyński, Ryszard J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Nonlinear methods in heart rate variability
Autorzy:: Barczyński, Ryszard J.
Kubasik, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/1953450.pdf
Data publikacji:: 1997
Wydawca:: Politechnika Gdańska
Opis:: In recent years, analysis of heart rate variability (HRV) has become a common tool for prediction of cardiac mortality. The universal rule is that a reduced variability is a signature for enhanced risk. However, the clinical value of the usual methods (the calculation of averages, standard deviations and variances of RR interval subsets, analysis of the power spectra in frequency domain) is very limited: false positive results cut the positive predictive value down to about 30%. We applied a net information flow method of determination of complexity in deterministic chaos (associated with nonlinear dynamics) to 24 hour recordings of beat-to-beat heart-rate. It is likely that analysis of HRV by the means of nonlinear dynamics may open a way for a new classification of HRV.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1997, 1, 2; 195-207
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Structural modelling of amorphous vanadium pentoxide
Autorzy:: Witkowska, Agnieszka
Barczyński, Ryszard J.
Rybicka, Anna
Powiązania:: https://bibliotekanauki.pl/articles/1953469.pdf
Data publikacji:: 1997
Wydawca:: Politechnika Gdańska
Opis:: Amorphous vanadium pentoxide (a -V2O5) is a component of many technically important semiconducting glasses. The transport properties are related directly to the material structure, and so in order to understand the transport mechanism the atom arrangement should be known. Much experimental work has been done to determine the short-range order in a -V2O5, but in view of contradicting conclusions the structure of the glass is still an open question. Thus, computer simulation techniques have been applied to get some insight into the structure of a -V2O5. In particular, the classical molecular dynamics (MD) simulations have been performed, using the original parametrisation of the interatomic interactions. Our effective interaction potential is derived from ab initio calculations of small hydrogen-saturated clusters VO„H„. The results of the MD simulations are discussed and compared to the available experimental data.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1997, 1, 1; 38-47
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

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