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61.
V. A. Merzlyakov 《International Applied Mechanics》1995,31(2):98-104
S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev. Translated from Prikladnaya Mekhanika, Vol. 31, No. 2, pp. 21–29, February, 1995. 相似文献
62.
E. G. Merzlyakov 《Fluid Dynamics》1985,20(2):305-309
The special features of the distribution of the magnetic field in the photosphere of the Sun and the experimental discovery of waves which propagate along magnetic tubes in the solar atmosphere have brought about the publication recently of a large number of articles which study the wave-conducting properties of media with a magnetic structure. One of the simplest cases was that of a plane magnetic layer, which was studied in detail in the linear approximation [1–3]. Starting from the dispersion properties of such a structure, [4] indicates the possibility of the existence in it of solitons in the approximation of waves of low amplitude which are long in relation to the layer. The present study has used the method of different-scale expansions to obtain the Schrödinger equation describing the propagation of nonlinear modulations of a symmetric harmonic mode over a plane magnetic layer in an incompressible fluid. A similar equation has been deduced, for example, for waves in water [5–9].Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 2, 164–168, March–April, 1985.The author wishes to thank M. S. Ruderman for formulating the problem and for useful discussions, and V. B. Baranov for his attention to the study. 相似文献
63.
V. A. Merzlyakov 《International Applied Mechanics》2000,36(10):1339-1348
A solution is proposed to the problem on the nonlinear deformation of shells with a coordinate surface of revolution and thickness variable in two directions. Using the efficient method of linearization of physical equations together with the Bubnov–Vlasov–Kantorovich method makes it possible to reduce the dimension of the problem and to solve it with a satisfactory computational burden. A method based on parameter expansion of shell rigidities is proposed in the case where the thickness varies slightly along the circumferential coordinate. The solutions of several problems illustrating the procedure developed are presented 相似文献
64.
To treat data from temperature modulated differential scanning calorimetry (TMDSC) in terms of complex or reversing heat capacity
firstly one should pay attention that the response is linear and stationary because this is a prerequisite for data evaluation.
The reason for non-linear and non-stationary thermal response is discussed and its influence on complex (reversing) heat capacity
determination is shown. The criterion for linear and stationary response is proposed. This allows to choose correct experimental
conditions for any complex heat capacity measurement. In the case when these conditions can not be fulfilled because of experimental
restrictions one can estimate the influence of non-linearity and non-stationarity on measured value of complex or reversing
heat capacity.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
65.
Quasi-isothermal temperature modulated DSC and DMA measurements (TMDSC and TMDMA, respectively) were performed to determine
heat capacity and shear modulus as a function of time during crystallization. Non-reversible and reversible phenomena in the
crystallization region of polymers can be observed. The combination of TMDSC and TMDMA yields new information about local
processes at the surface of polymer crystals, like reversible melting. Reversible melting can be observed in complex heat
capacity and in the amplitude of shear modulus in response to temperature perturbation. The fraction of material involved
in reversible melting, which is established during main crystallization, keeps constant during secondary crystallization for
PCL PET and PEEK. This shows that also after long crystallization times the surfaces of the individual polymer crystallites
are in equilibrium with the surrounding melt. Simply speaking, polymer crystals are ‘living crystals’.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
66.
Christoph Schick Andreas Wurm Mikhail Merzlyakov Alexander Minakov Herv Marand 《Macromolecular Symposia》2001,165(1):83-90
Temperature modulated DSC (TMDSC) measurements at reasonably high frequencies allow for the determination of baseline heat capacity. In this particular case vitrification and devitrification of the rigid amorphous fraction (RAF) can be directly observed. 0.01 Hz seems to be a reasonably high frequency for Bisphenol‐A Polycarbonate (PC). The RAF of PC is established during isothermal crystallization. Devitrification of the RAF seems to be related to the pre‐melting peak. For PC the melting of small crystals between the lamellae is thought to yield the pre‐melting peak. 相似文献
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A technique is proposed to solve elastoplastic deformation problems for branched shells of revolution under the action of asymmetric forces and a temperature field. The kinematic equations are derived within the framework of the linear Kirchhoff–Love theory of shells and the thermoelastic relations within the framework of the theory of small elastoplastic strains. The problem is given a variational formulation based on the virtual-displacement principle and the Fourier-series expansion of the unknown functions and loads with respect to the circumferential coordinate. The additional-load method is used to solve a nonlinear problem and the finite-elements method is used to carry out a numerical analysis. As an example, an asymmetric stress–strain analysis is performed for a cylindrical shell reinforced by a ring plate. 相似文献