Statistical homogenity of (Cr,AI, -J20, solid solutions is investigated. It is shown, that there may be distinguished the region of statistical regularities and regions where prevail the clusters of two, three, and four chromic ions (111). The formation mechanism of solid solutions mentioned is proposed.Es wird die statistische HomogenitHt von (Cr,AI, -x)20,-Mischkristallen untersucht. Es wird gezeigt, daB unterschieden werden muB zwischen dem Bereich der statistischen Regularitaten und Bereichen, wo Cluster von zwei, drei oder vier Chromionen (111) vorherrschen. Der Bildungsmechanismus der erwahnten Mischkristalle wird vorgeschlagen.
Modern information and telecommunication technologies allow not only to provide information required for training students in electronic form, they promote changes in educational process. The electronic information educational environment provides the necessary mechanism for implementing student`s individual trajectories of training. Depending on his or her learning progress the process can vary from basic to intensive, with changes in volumes of information provided. One of the approaches to developing an adaptive electronic educational course is described in this paper. The tree of concepts mastered by students is considered as a basis for knowledge component organization. The tree of concepts will allow not only to organize theoretical material of the course in the form of the separate blocks of educational information intended for studying but also to determine a necessary and sufficient set of questions for testing students.
The statistical homogenity of (Ti,AI, -J203 solid solutions is investigated. It is shown that the dependence of magnetic susceptibility on the temperature in the range 78 to 700 K is determined not by the temperature-independent paramagnetism contribution, but by the presence of double and triple groupings of exchange coupled Ti3+ ions in the (Ti,AI, -J203 solid solution structure. Es wird die statistische Homogenitat von (Ti,Al, _,),O,-Mischkristallen untersucht. Es wird gezeigt, da13 die Abhangigkeit der magnetischen Suszeptibilitat von der Temperatur im Bereich 78 bis 700 K nicht von dem Beitrag des temperaturunabhangigen Paramagnetismus sondern vom Beitrag von Doppel-und Dreifachgruppierungen von austauschgekoppelten Ti3 +-Ionen in der (Ti,Al, -J2O3-Mischkristallstruktur bestimmt wird.
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