On Poisson–Malcev Structures

Malcev–Poisson structure on a manifold is analogous to a Poisson structure with the Lie identity replaced by a slightly more general Malcev identity. Examples of such structures arise naturally. In the second part of the paper we study Malcev bialgebras. A theorem of characterization is proved.     

Content and Methodological Provision of the Basic Course of Analytical Chemistry

Russian standards in training conventional graduates and bachelors are considered. These standards determine the status and volume of analytical chemistry courses at different higher educational institutions. An analysis of the educational standards, standard curricula, and the aims of teaching analytical chemistry suggests the advisability of changing the content of the course, particularly at industrial (branch) higher educational institutions. The provision of the analytical chemistry course with special literature (manuals, textbooks), equipment, and computer software is considered.     

Nonstoichiometry and low-temperature magnetic properties of FeSi crystals

The results of experimental and theoretical studies of the low-temperature properties of FeSi crystals are presented. The specific features of the magnetic susceptibility are shown to be related to the superparamagnetic behavior of impurity clusters. The thermomagnetic hysteresis phenomena observed are explained using the model of exchange-coupled clusters.     

NQR spectra of alloys of antimony-cadmium-zinc system

Conclusions A number of metal alloys in the Sb-Cd-Zn system was studied for the first time by the NQR method on the^121,123Sb nuclei. The constants of the quadrupole bond and the asymmetry parameter of the compounds ZnSb were determined.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No; 7. pp. 1638–1640, July, 1977.     

Analytical Chemistry in the System of Interrelationships among Disciplines Studied at Classical Universities

Interrelationships between a university course on analytical chemistry and other disciplines attended by students specializing in chemistry are discussed. The teaching of analytical chemistry at a level corresponding to the present state of the art requires optimizing the order of teaching of interdisciplinary courses and some changes in the curricula of these courses (especially, in physics). A consideration of interrelationships between disciplines also implies a modification of the course on analytical chemistry (to avoid doubling, etc.).     

Metallosilicates as supports of Co catalysts for the synthesis of liquid hydrocarbons from CO and H2

The effect of the nature of the silicate support on the activity and selectivity of 10%. Co/M silicate catalysts (where M=Cu, Zn, Ce, Ti, Hf, La, Al, Zr, Co, Mg) in the synthesis of hydrocarbons from CO and H₂ has been established. Co and Zr catalysts have been shown to provide the highest catalytic efficiency. The yield of liquid hydrocarbons in their presence exceeds 120 g m^–3.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 480–482, March, 1993.     

Methodology of analysis of unseparated mixtures: Error limits in estimating the total analyte concentration recalculated to a standard substance

In estimating the total concentration of similar analytes recalculated to a standard substance X_st, different sensitivities of their determination result in a systematic error δc, depending on the choice of X_st and the composition of the analyzed mixture. Two methods of predicting the limiting values of this error (δc _max), with and without the account of the properties of X_st are proposed and tested on model mixtures. The methods can be used if the total analytical signal linearly depends on the concentrations of analytes and is additive (spectrophotometry, conductometry, etc.). The value of δc _max is independent of the ratio of analytes concentrations in the sample. To reduce δc _max, one should equalize the sensitivities of the determination of all compounds of a given type and use analytes with medium sensitivities as X_st.     

The effect of Ce3+ cations on polyaniline morphology and electric properties

Polyaniline (PANI) is synthesized in the potentiostatic pulse mode from an electrolyte containing Ce₂(SO₄)₃. Cations Ce³⁺ are incorporated into the polymer composition during PANI redox transformations. It is shown that PANI in its conducting and dielectric forms contains different amounts of Ce³⁺ cations. Starting with the beginning of polymerization, the Ce³⁺ cations actively form the special polymer morphology as demonstrated by SEM images. The chief consequence of the formation of so well-developed uniform nanostructure is that the latter allows the dopant anions, cations, and protons to easily enter and leave it. This, in turn, results in the high electrochemical activity of this polymer and enhances the conductivity of PANI samples doped with Ce³⁺ cations as compared with those doped with only protons.