DSpace Общество:http://rep.ksu.kz/handle/data/19202018-08-16T08:41:34Z2018-08-16T08:41:34ZAbsolute convergence of fourier series of superpositions of functionsAkishev, G.A.http://rep.ksu.kz/handle/data/30302018-05-31T19:00:32Z2009-11-01T00:00:00ZНазвание: Absolute convergence of fourier series of superpositions of functions
Авторы: Akishev, G.A.
Аннотация: In this paper we establish conditions for the absolute convergence of series of Fourier coefficients with respect to a generalized Haar system of a superposition of two functions.2009-11-01T00:00:00ZMathematical simulation of the hydrogenation of borodino coalAkhmetkarimova, Zh. S.Baikenov, M. I.Dyusekenov, A. M.http://rep.ksu.kz/handle/data/22822018-02-15T19:00:33Z2017-03-01T00:00:00ZНазвание: Mathematical simulation of the hydrogenation of borodino coal
Авторы: Akhmetkarimova, Zh. S.; Baikenov, M. I.; Dyusekenov, A. M.
Аннотация: The kinetic and thermodynamic parameters of the hydrogenation of Borodino brown coal were calculated. With the use of equilibrium-kinetic analysis, the second-order reaction rate constants of forward and reverse reactions, the equilibrium constant, the activation energy, and the thermal effects of brown coal hydrogenation reactions were determined in a temperature range of 648–698 K at a hydrogen pressure of 10 MPa. In the course of the study, it was found that the experimental data are indicative of the adequacy of the equilibrium-kinetic analysis model for second-order reactions.2017-03-01T00:00:00ZConformational space of 4,4′-methoxypropylstilbene moleculeAbulyaissova, L. K.Kenzhetaeva, S. O.Kasymova, M. S.http://rep.ksu.kz/handle/data/22812018-02-15T19:00:33Z2017-06-01T00:00:00ZНазвание: Conformational space of 4,4′-methoxypropylstilbene molecule
Авторы: Abulyaissova, L. K.; Kenzhetaeva, S. O.; Kasymova, M. S.
Аннотация: Quantum-chemical simulation of the ground state [the density function B3LYP/6-31G, B3LYP/6-31G(d), and B3LYP/6-31+G(d,p) and the perturbation theory MP2/6-31G(d) methods] and the transition states [the B3LYP/6-31G(d) method] of 4,4′-methoxypropylstilbene molecule has been performed. Using the Ellinger MM2 force field method, the potentials of internal rotation have been obtained for each rotational degree of freedom of the molecule. The B3LYP simulation has revealed the planarity of the conjugated system and the orthogonal position of the alkyl substituent, whereas the benzene rings have deviated by about 20° with respect to the double bond plane according to the MP2 data. Three transition states of the molecule corresponding to the saddle points of the first and the second orders have been revealed. The stationary points have been identified by means of vibrational analysis.2017-06-01T00:00:00ZNew phosphorylated glycoluril derivativesSal’keeva, L. K.Taishibekova, E. K.Bakibaev, A. A.Minaeva, E. V.Makin, B. K.Sugralina, L. M.Sal’keeva, A. K.http://rep.ksu.kz/handle/data/22802018-02-15T19:00:31Z2017-03-01T00:00:00ZНазвание: New phosphorylated glycoluril derivatives
Авторы: Sal’keeva, L. K.; Taishibekova, E. K.; Bakibaev, A. A.; Minaeva, E. V.; Makin, B. K.; Sugralina, L. M.; Sal’keeva, A. K.
Аннотация: The N-acylation of glycoluril with 1-haloacetyl halides was studied. The optimal conditions and reaction regioselectivity, as well as the effect of reagent molar ratios, base nature, temperature, and reaction time on the yield of the target product were established. It was shown that the chemical modification of the synthesized bis(bromoacetyl) derivative of glycoluril by phosphorylation by the classical Arbuzov reaction gave a previously unknown bis(diethylphosphonoacetyl) derivative of glycoluril. The consecutive silylation and hydrolysis of the latter derivative gave the corresponding bis(phosphonoacetyl) derivative which presents interest as a potentially biologically active compound.2017-03-01T00:00:00Z