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1.
V. N. Elokhina A. S. Nakhmanovich R. V. Karnaukhova I. D. Kalikhman M. G. Voronkov 《Chemistry of Heterocyclic Compounds》1981,17(3):235-239
The reaction of -alkynyl ketones with o-phenylenedithiol, which leads to the formation of 2-acylmethylbenzo-1,3-dithioles, was investigated. Reactions of the latter with hydrazine hydrate and hydroxylamine and oxidation were realized. Difficult-to-obtain 2-acylmethylenebenzo-1,3-dithioles were obtained by the reaction of -bromoalkynyl ketones with o-phenylenedithiol. The IR and PMR spectra of the synthesized compounds are presented.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 329–332, March, 1981. 相似文献
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M. I. Enmakova N. K. Karnaukhova I. A. Shikhova N. I. Latosh 《Chemistry of Heterocyclic Compounds》1977,13(12):1344-1346
Several 1,5-diphenyl-3-tetrazolylformazans were synthesized by reaction of 1,5-diaryl-3-cyanoformazans with sodium azide.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1679–1681, December, 1977. 相似文献
4.
Karnaukhova R. V. Nizovtseva T. V. Nakhmanovich A. S. Albanov A. I. Komarova T. N. 《Russian Chemical Bulletin》2001,50(12):2475-2476
Reactions of 1-aroyl-2,2-dimethylhydrazines with 1,3-dibromopropyne in MeOH or MeCN at 20—50 °C yield 2-aryl-6-bromomethylidene-4,4-dimethyl-5H-1,3,4-oxadiazinium bromides. 相似文献
5.
The basic relations of the thermomechanics of thin-walled viscoelastic plates with distributed piezoelectric sensors under
monogarmonic mechanical loading are presented. To describe the thermomechanical behavior of materials, the concept of complex
characteristics is used. Numerical and variational methods are used to study the forced resonant vibrations of viscoelastic
plates with distributed piezoelectric sensors. The effect of dissipative heating on the readings of the sensors of a circular
viscoelastic plate undergoing axisymmetric resonant bending vibrations is analyzed as an example 相似文献
6.
Karnaukhov V. G. Kozlov V. I. Rasskazov A. O. Karnaukhova O. V. 《Mechanics of Composite Materials》2003,39(1):17-26
Based on the Kirchhoff-Love hypotheses and adequate supplementary hypotheses for the distribution of electric field quantities, a model for parametric vibrations of composite shells of revolution made of a passive (without a piezoeffect) middle layer and two active (with a piezoeffect) surface layers under the action of harmonic mechanical and electric loads is developed. The dissipative material properties are taken into account by linear viscoelastic models. Since the vibrations on the boundary of the main domain of dynamic instability (MDDI) are harmonic, the investigation of this domain, in a first approximation, is reduced to generalized eigenvalue problems, which are solved by the finite-element method. The problem on parametric vibrations of a three-layer conical shell under harmonic mechanical loading is considered. The influence of the shell thickness, dissipation, and electric boundary conditions on the MDDI is investigated. Two limiting cases of electric boundary conditions are considered, where the electrodes are short-circuited or not. The curves presented show a considerable influence of the electric boundary conditions on the characteristics of the MDDI, namely on its width and position on the frequency axis and on the critical parameter of excitation. 相似文献
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A. S. Nakhmanovich R. V. Karnaukhova T. N. Komarova M. V. Sigalov L. A. Kron 《Chemistry of Heterocyclic Compounds》1988,24(1):103-105
Methyl propiolate reacts with thiosemicarbazones in methanol in the presence of triethylamine to give 2-benzylidene(thenylidene, or furfurlidene)azino-3H-1,3-thiazin-4-ones.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 123–125, January, 1988. 相似文献
8.
V. I. Kozlov T. V. Karnaukhova M. V. Peresun’ko 《Journal of Mathematical Sciences》2010,167(2):173-181
We consider the problem of active damping of the forced resonance vibrations of a viscoelastic cylindrical panel with the
help of piezoelectric actuators. The end faces of the panel are assumed to be simply supported and heat-insulated. An analytical
solution of the problem of electromechanics is obtained. On this basis, the dissipative function is calculated, and the energy
equation is solved. We also analyze the influence of the temperature of dissipative heating on the efficiency of active damping
of the forced vibrations of a cylindrical panel. 相似文献
9.
T. V. Karnaukhova 《International Applied Mechanics》2010,46(5):562-566
An approach to the active damping of the forced resonant vibrations of orthotropic thermoviscoelastic plates with distributed
sensors and actuators is proposed. The mechanical load is assumed unknown and is determined from the sensors’ indications.
The problem of active damping of an isotropic thermoviscoelastic rectangular plate with hinged edges is solved as an example.
A formula for the voltage to be applied to the actuator to damp the forced vibrations in the first mode is derived. The effect
of the dimensions of the sensor and actuator and the dissipative properties of the materials on the effectiveness of active
damping is studied 相似文献
10.
The paper examines the effect of dissipative heating on the performance of a sensor in a hinged thermoviscoelastic rectangular
plate undergoing resonant flexural vibrations. The thermoviscoelastic behavior of materials is described using the concept
of complex characteristics. The coupling of the electromechanical and thermal fields is taken into account. The nonlinear
problem is solved by the variational and Bubnov–Galerkin methods. The effect of the dissipative-heating temperature and the
dimensions of the sensor on its performance during resonant vibrations of the plate is analyzed. 相似文献