The usage of biotransplants (the autologous rat''s mesenchimal stem cells on the ceramic granules)for reconstruction of bone defects

The usage of the biotransplants postnatal mesenchimal stem cells (MSC) on 2-D, 3-D scaffolds in cell based therapy is actual.     

Manganese Doped Zinc Sulfide Quantum Dots as Efficient Photocatalyst for Dye Decolorization

Semiconductors - A simple aqueous based synthesis technique at room temperature was performed for preparation of pure and manganese (Mn2+) doped ZnS quantum dots in the presence of glutathione as...     

Determination of moisture in brown coals

The measurement results of moisture in high-moisture brown coal performed by different (gravimetric and chemical) methods are presented. The experimental results are compared. Conclusions on procedures chosen for the measurements of brown coals are proposed, and the promising lines of the measurements of moisture in coals are outlined.     

Computational investigation of the stress-strain state of graphite blocks in light of substantiation of RBMK service-life extension

To increase the service life of RBMK-1000 power-generating units to 45 years, it is necessary to substantiate lifetime of the reactor structures operating under irradiation. Specifically, computational work is needed to substantiate the strength and lifetime characteristics. The characteristic features of each type of reactor, and not only the general behavior of graphite under irradiation, are important for making more accurate predictions. It is desirable to rely on the finite-element model with three-dimensional finite elements, since graphite possesses anisotropic properties in different directions. This article describes a method and program, developed on the basis of the finite-element method, that takes account of the nonuniformity of the neutron field and temperature distributions over the cross-section of a graphite block and the nonuniform anisotropic shrinkage (swelling) and creep of graphite. __________ Translated from Atomnaya énergiya, Vol. 104, No. 3, pp. 157–160, March, 2008.     

Formation of the acoustic field of a Rayleigh-wave transducer in an object with a protrusion. Part 2. Influence of the protrusion angle and other factors. Applied aspects

Experimental data from studies of the formation of the fields of transverse and longitudinal modes at frequencies of 1–3 MHz, whose primary source is a Rayleigh-wave transducer (PET), in specimens with different angles of protrusion γ = 0–135° are presented. Data on the surface-acoustic-wave (SAW) transmission coefficients for the passage through the region of matching of the specimen contact surface to the inner face of the protrusion and the SAW transformation into a head (surface) wave, which serves as the source of one of the components of the transverse-mode field, were obtained. The influence of the protrusion height, h, on the passage of a transformed SAW acoustic pulse through it was investigated, and the possibility of detecting surface defects that are located on the opposite side of the protrusion was shown. Applied aspects of using the investigation results in the ultrasonic testing and measurement technique were considered.     

Thermal and mechanical properties of simultaneous and sequential full-interpenetrating polymer networks

An investigation of the thermal and mechanical characteristics of new full-interpenetrating polymer networks (full-IPNs), prepared by simultaneous and sequential synthesis paths, has been performed in the temperature regions above and below the glass transition. It has been observed that simultaneous full-IPNs exhibit higher values of density than sequential full-IPNs, as a consequence of an enhanced intermolecular packing. This peculiarity leads to an increase of the glass transition temperature and to a larger “γ-suppression” effect for the γ₂-relaxation characterizing the polycyanurate phase of simultaneous full-IPNs, which has been ascribed to reduction of the free-volume available for the molecular group rearrangements.