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X-ray diffraction investigations of CaF2 at high pressure (1992)

Gerward, L. ; Olsen, J. S. ; Steenstrup, S. ; [et al.]

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 25 (1992), S. 578-581

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ISSN: 1600-5767

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Geosciences , Physics

Notes: Synchrotron-radiation X-ray diffraction studies of CaF2 at high pressures have been performed on a powder sample up to 45 GPa and on a single-crystal sample up to 9.4 GPa. The bulk modulus of the low-pressure phase was determined to be B0 = 87 (5) GPa. A phase transition was observed at about 9.5 GPa. The transition is accompanied by a volume contraction of 11%. The high-pressure phase is orthorhombic PbCl2 type (space group Pbnm). The sample only partially reverts to the low-pressure phase upon release of pressure.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S0021889892004096

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Non-linear and linear forecasting of the EEG time series (1991)

Blinowska, K. J. ; Malinowski, M.

Springer

Biological cybernetics 66 (1991), S. 159-165

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ISSN: 1432-0770

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Computer Science , Physics

Notes: Abstract The method of non-linear forecasting of time series was applied to different simulated signals and EEG in order to check its ability of distinguishing chaotic from noisy time series. The goodness of prediction was estimated, in terms of the correlation coefficient between forecasted and real time series, for non-linear and autoregressive (AR) methods. For the EEG signal both methods gave similar results. It seems that the EEG signal, in spite of its chaotic character, is well described by the AR model.