Investigation of inclusive production ofK 0 andK * (892)0 mesons inK + A interactions at 11.2 GeV

Inclusive production ofK ⁰ andK ^* (892)⁰ mesons inK ⁺ A-interactions (A=Be, Cu, Pb) at the energy 11.2 GeV has been investigated to study hadronisation of the leading \(\bar s\) -quark; the results are presented. Double differential cross sections d²σ/dx _f dp _t ² were measured in the region of incident particle fragmentation (0.4≦x _f ≦1,p _t ≦0.5 GeV/c). The experimental data obtained were analysed on the basis of the Lund model FRITIOF and a quark-gluon model that takes into account colour screening and hadron formation length effects. The experimental data confirm the picture of hadronisation of the leading \(\bar s\) -quark developed in the latter model.     

Application of the aperture synthesis technique in optical interference microscopy

A method of integrated computational processing of series of microscopic images obtained at different angles of object illumination is proposed. Numerical simulation is performed based on the rigorous solution of the vector problem of electromagnetic scattering at various objects. The possibilities of increasing the effective resolving power of microscopes by using this method are studied.     

The structure,properties, and thermal destruction of biodegradable blends of cellulose and ethylcellulose with synthetic polymers

Powder blends of low-density polyethylene with cellulose and ethylcellulose were obtained under high-temperature shear deformation conditions in a rotor disperser at various initial reagent ratios. The composition of powder fractions was shown to be identical to the initial blend composition, which was evidence that the compositions obtained were homogeneous. Comparative studies of the structure of the initial and produced powder blends and mechanical characteristics of films obtained from them were determined by the X-ray method. Thermogravimetric analysis was used to study thermal destruction of individual polymers and their compositions. The effective kinetic parameters were calculated and used to suggest a model of diffusion-controlled polymer decomposition. The addition of polyethylene oxide was found to increase biodegradability of compositions based on cellulose. It therefore contributed to broadening of the applicability range of materials based on them.     

Degradation of gas phase decabromodiphenyl ether by resonant interaction with low-energy electrons

Resonance electron attachment in a series of brominated phenyl ethers, including decabromodiphenyl ether (DBDE), was investigated in the gas phase by means of electron transmission spectroscopy (ETS) and dissociative electron attachment spectroscopy (DEAS). Attachment of thermal electrons to DBDE leads to various dissociative decay channels of the temporary molecular anion. In contrast to other bromophenyl ethers, the bromide anion is not the most intense negative fragment. The neutral counterparts of the observed [Br(2)](-) and [C(6)Br(4)O](-) anion fragments are ascribed to the closed-shell species octabromodibenzofuran and hexabromobenzene, respectively, although their formation implies complex atomic rearrangements. Density functional theory calculations are employed to evaluate electron affinities, thermodynamic energy thresholds for production of the anion fragments observed in the DEA spectra and the proton affinities of the corresponding neutral radicals. Since DBDE is one of the most widespread organic pollutants, the present gas-phase DEA study can provide indications on the reaction mechanisms which occur in vivo and cause injuries to living cells.     

Structure and biological properties of sodium and potassium 1-(carboxy)-1-(N-methylamide)-2-(3′,5′-di-tert-butyl)-4-hydroxyphenyl)-propionates

Sodium (1) and potassium (2) 1-(carboxy)-1-(N-methylamide)-2-(3′,5′-di-tert-butyl)-4-hydroxyphenyl)-propionates form crystal hydrates, which exist as both monomers and dimers. Quantum-chemical calculations in the PM6 approximation are used to determined the enthalpies of formation ?H _f ^po , thermal enthalpy H ^po, and entropy S ^po of the monomers and dimers, which are indicative of the possibility of existence of the dimers of propionates of alkali metals. The biological activity of these compounds in animal and plants is demonstrated to be dependent on their concentrations. Compounds 1 and 2 turned out to be efficient in the treatment of burn injuries, cancer, and radiation damage (in vivo and in vitro), as well as in promoting the growth of cereal plants.     

Influence of Submicron Anthracite Particles on the Conditions of Aerosol Synthesis and the Properties of Carbon Nanotubes

Russian Physics Journal - Properties of single-walled carbon nanotubes (SWCNTs) obtained by the floating catalyst CVD method using ethyl alcohol and coal (anthracite and semi-anthracite) particles...     

Semi-Inverse Solution of a Pure Beam Bending Problem in Gradient Elasticity Theory: The Absence of Scale Effects

The semi-inverse solutions of pure beam bending problems within the three-dimensional formulation of gradient elasticity theory as exact tests for the problem of estimating the efficient bending stiffness of so-called scale-dependent thin beams and plates due to the necessity of modeling sensing devices are presented. It is shown that the solutions within the gradient elasticity theory give classic beam bending stiffnesses and demonstrate the invalidity of the widespread results and estimates obtained in the past 15 years during study of scale effects within the gradient beam theories, according to which the relative bending stiffness grows by a hyperbolic law with decreasing thickness.     

Problems of the deformation of microinhomogeneous viscoelastic solids and the couple-stress theory of viscoelasticity

The problem of determining the mean displacements of a microinhomogeneous viscoelastic body is reduced to a problem of the couple-stress theory of viscoelasticity. A uniqueness theorem is proved for the latter and a variational principle corresponding to the principle of stationarity of potential energy in the theory of elasticity is formulated and proved. The question of the experimental determination of the functions characterizing the properties of a medium with couple stresses is examined.Mekhanika Polimerov, Vol. 3, No. 2, pp. 213–220, 1967