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Chisinau, Moldova

The Moldova State University is a university located in Chişinău, Moldova. It was founded in 1946. Wikipedia.

The processes of micro-object hologram real-time recording on a photo-thermo-plastic carrier based on a chalcogenide glassy semiconductor As-Se-S-Sn system were studied. The possibility to measure micro-object dimensions using an interference fringe pattern was shown. Double-exposure hologram recording by use of photo-induced structural transformation processes in a photo-semiconductor and photo-thermoplastic recording process was investigated. © 2010 Taylor & Francis. Source

Seremet V.,Moldova State University
Engineering Analysis with Boundary Elements

In this paper the functions of influence of unit point heat source onto displacements and Poisson-type integral formula for a boundary value problem (BVP) in thermoelastic half-space, free of loadings on the boundary plane are presented in closed form. The thermoelastic displacements are generated by heat source applied at the inner point of the half-space and by heat flux, prescribed on its boundary. All these results are formulated in a special theorem. Furthermore, the advantages and usefulness of the obtained results are also discussed. The main difficulties to obtain such kind of results are to derive the functions of influence of a unit concentrated force onto elastic volume dilatation Θ(k) and Green's functions in heat conduction G. For canonical Cartesian domains, these difficulties were addressed successfully, and the above-mentioned functions were derived and published earlier. Thus, it can be presumed that for the Cartesian domains, this paper will open a great possibility to derive new thermoelastic influence functions and Poisson's integral formulas in closed form. Moreover, the technique proposed here will also work for any orthogonal canonical domain, as soon as the lists of functions G and Θ(k) are completed. © 2009 Elsevier Ltd. All rights reserved. Source

This paper is devoted to a new approach for the derivation of main thermoelastic Green's functions (MTGFs), based on their new integral representations via Green's functions for Poisson's equation. These integral representations have permitted us to derive in elementary functions new MTGFs and new Poisson-type integral formulas for a thermoelastic octant under mixed mechanical and thermal boundary conditions, which are formulated in a special theorem. Examples of validation of the obtained MTGFs are presented. The effectiveness of the obtained MTGFs and of the Poisson-type integral formula is shown on a solution in elementary functions of a particular BVP of thermoelasticity for octant. The graphical and numerical computer evaluation of the obtained MTGFs and of the thermoelastic displacements of the particular BVP for an octant is also presented. By using the proposed approach, it is possible to derive in elementary functions many new MTGFs and new Poisson-type integral formulas for many canonical Cartesian domains. © 2013 Springer-Verlag Wien. Source

Seremet V.,Moldova State University
Archive of Applied Mechanics

This article presents in a closed form new influence functions of a unit point heat source on the displacements for three boundary value problems of thermoelasticity for a half-plane. We also obtain the corresponding new integral formulas of Green's and Poisson's types that directly determine the thermoelastic displacements and stresses in the form of integrals of the products of specified internal heat sources or prescribed boundary temperature and constructed already thermoelastic influence functions (kernels). All these results are presented in terms of elementary functions in the form of three theorems. Based on these theorems and on derived early by author the general Green-type integral formula, we obtain in elementary functions new solutions to two particular boundary value problems of thermoelasticity for half-plane. The graphical presentation of the temperature and thermal stresses of one concrete boundary value problems of thermoelasticity for half-plane also is included. The proposed method of constructing thermoelastic Green's functions and integral formulas is applicable not only for a half-plane, but also for many other two- and three-dimensional canonical domains of different orthogonal coordinate systems. © 2014 Springer-Verlag Berlin Heidelberg. Source

Balandin A.A.,University of California at Riverside | Nika D.L.,University of California at Riverside | Nika D.L.,Moldova State University
Materials Today

Phonons - quanta of crystal lattice vibrations - reveal themselves in all electrical, thermal, and optical phenomena in materials. Nanostructures open exciting opportunities for tuning the phonon energy spectrum and related material properties for specific applications. The possibilities for controlled modification of the phonon interactions and transport - referred to as phonon engineering or phononics - increased even further with the advent of graphene and two-dimensional van der Waals materials. We describe methods for tuning the phonon spectrum and engineering the thermal properties of the low-dimensional materials via ribbon edges, grain boundaries, isotope composition, defect concentration, and atomic-plane orientation. © 2012 Elsevier Ltd. Source

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