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    A mathematical pattern of the relation man-environment, represented by anticipatory systems
    (Selçuk Üniversitesi Mühendislik-Mimarlık Fakültesi, 2007) Otlacan, Eufrosina; Cristea, Lidia
    In a pair of mixed advanced-retarded differential equations we consider man as being the master system and the environment as the slave system. This is the case when man’s behaviour is dependent on a future state of the environment, while the environment’s rate of change is dependent on a past state (hence a past action) of man. Man, as the master system, should take forecasts into consideration. The mathematical model used in the paper pertains to the modelling of interaction of two systems, such as the observation operator, the pragmatic operator, and especially the differential system of equations, in case the reciprocal influence between two systems manifests itself, throughout their evolution, with a time difference.
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    The study of the crystalline structure of the phases in the al-ni alloys ultrarapid solidification by the method of x ray diffraction
    (Selçuk Üniversitesi Mühendislik-Mimarlık Fakültesi, 2007) Cristea, Lidia; Otlacan, Eufrosina; Cristea, Enona
    Melt –spinning and melt extraction methods of rapid solidification have been applied on Al-Ni alloys in the lower and higher composition. For orientate appreciations of the peripheric speed of the cooling disk it is used the dependence between the thickness of the solidified fibers and the peripheric speed of the extraction disk. The cooling speed calculated on the basis of the thermic transfer coefficient in accordance with the thickness of the fibers has lead to values of the cooling speed of the one million C/sec for fibres of 100 micrometers. Alloys with 1,86 % Ni content in pouring status and ultra-rapid solidificated have been analysed from the point of crystalline structure. The paper it’s a short analysis of the use of the X-ray diffraction techniques for observing the effects of ultra-rapid solidification in Al-Ni alloys. This technique permit to observe highlighting the imperfections in the crystal pattern.