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101.
102.
103.
The Mobius transforms for linear ordinary differential equations of the second order are examined. It is shown that this transform
has some quasi-isospectral properties. Solutions of the Heun equation with one apparent singularity are constructed. Bibliography:
15 titles.
__________
Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 308, 2004, pp. 67–88. 相似文献
104.
E. I. Nalivaiko A. G. Sirota P. A. Il'chenko I. S. Shishova 《Mechanics of Composite Materials》1968,4(1):44-49
The stress cracking resistance of low-pressure polyethylene can be improved by introducing finely dispersed mineral additives (TiO2, SiO2, Al2O3 · SiO2) and surface-active agents (anthranilic, adipic, and sebacic acids; mannitol). The amounts needed to effectively increase the cracking resistance without detriment to the principal physicomechanical and other characteristics of the material have been determined.Mekhanika Polimerov, Vol. 4, No. 1, pp. 67–71, 1968Communication V of the series "Modification of the Structure and Properties of Polyolefins." 相似文献
105.
106.
107.
O. N. Ivanov E. P. Dan’shina V. V. Sirota I. D. Tarasova 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(9):1257-1259
X-ray structural, X-ray phase, and dilatometric analyses were used to explore specific features of the formation of solid
solutions in the (1 − x)SrTiO3−xBiScO3 system with x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5. It was found that the synthesis of solid solutions from the initial Bi2O3, Sc2O3, TiO2, and SrCO3 components is accompanied by a considerable increase in the linear dimensions of the samples, depending on their composition.
Solid solutions with x > 0.1 are formed through intermediate phases (Sr5Bi6O14 at x = 0.2; Sr0.78Bi2.22O4 at x = 0.3; and Sr2.25Bi6.75O12.38 at x = 0.4 and 0.5). It was shown that the samples with x = 0.2, 0.3, 0.4, and 0.5 have two phases: one with a cubic Pm3m structure and one with a tetragonal I4/mcm structure. 相似文献
108.
David I. Sirota 《Physica B: Condensed Matter》2009,404(16):2349-2352
Direct parametrical amplification of ultrasound was theoretically considered for the ferromagnetic/piezoelectric thin-layered structure composites, for which within the long-wavelength approach some, material specific, yet homogeneous bulk properties could be assumed. Having chosen appropriate homogeneous components, it is possible to construct a desirable composite with such properties that are absent in the starting-up “building blocks” (components).Sound frequencies are assumed to be such that only the dispersion due to magnetic subsystem is thought relevant; the piezoelectric components are set to have a nonlinear dielectric response. Presence of orientational phase transition for the ferromagnetic subsystem allows to vary frequency of a ferromagnetic resonance, and consequently to alter the dispersion at the chosen frequency of sound.While solving coupled equations describing dynamics of mechanical, magnetic and piezoelectric subsystems, an effective sound amplification for realistic values of physical parameters is shown possible. 相似文献
109.
110.
Jóna E. Kubranová M. Sirota A. Kopcová M. 《Journal of Thermal Analysis and Calorimetry》2001,63(3):807-813
Thermal analysis (TG, DTG) and infrared absorption spectra were used to study desorption of pyridine (py), 4-methylpyridine
(4-Mepy) and 4-ethylpyridine (4-Etpy) from Ni(II)-exchanged montmorillonite (Ni-MMT). It is shown that the bonds between the
derivatives of pyridine (R-py) and the montmorillonite exhibit predominantly Lewis acid character. The thermal stability of
studied samples and the total amounts of R-py inserted in the porous structure of Ni-MMT increase in the following sequence:
py/Ni-MMT<4-Mepy/Ni-MMT<4-Etpy/Ni-MMT, i. e. the influence of the substituent on the pyridine ring is evident.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献