Existence and blow-up of Kantorovich principal continuous solutions of nonlinear integral equations

We obtain sufficient conditions for the existence of a principal solution of a nonlinear Volterra integral equation of the second kind on the half-line and on a finite interval. We suggest a method for computing the boundary of an interval outside which the solution can blow up.     

STUDY OF THE DEFECTIVE STRUCTURE OF LITHIUM NIOBATE CRYSTALS OF DIFFERENT COMPOSITIONS AND THEIR INFLUENCE ON THE OPTICAL AND ELECTRICAL PROPERTIES

Journal of Structural Chemistry - The work considers the influence of various types of equilibrium defects on photovoltaic and diffusion fields and on the band gap of nominally pure and zinc-doped...     

Some compression flows in nonaxisymmetric ring nozzles

Busemann's problem concerning fully developed conical flow in an axisymmetric nozzle of special type is extended to include certain nonaxisymmetric ring nozzles. The constructed flows contain strong discontinuities in the form of developable surfaces (in Busemann's solution, strong discontinuities have the form of a circular-cone surface).     

A Study of Electrical Characteristics of Crystals of Homogeneously Doped LiNbO3:Zn,Mg in the Temperature Range of 450–900 K

Technical Physics - In a series of initially polydomain crystals of LiNbO3:Zn,Mg obtained by the homogeneous doping of the crystals in the concentration ranges of around 1 ± 0.02 mol % MgO and...     

Photovoltaic Fields and the Secondary Structure of Nominally Pure Lithium Niobate Crystals Grown from a Boron-Doped Furnace Charge

Technical Physics - It has been shown that the growth of nominally pure lithium niobate crystals from a nonmetal (boron)-structured melt makes it possible to control the secondary phase, optical...     

Current-Voltage Characteristics of nBn Structures Based on Mercury Cadmium Telluride Epitaxial Films

Russian Physics Journal - The current – voltage characteristics of nBn structures based on HgCdTe grown by molecular beam epitaxy (MBE) on GaAs substrates in the temperature range 9–300...     

Empirical pairing gaps and neutron-proton correlations

Analysis of various mass formulas related to neutron-proton correlations in atomic nuclei is carried out.Using the example of the N =Z chain it is shown that for self-adjoint nuclei various formulas proposed in literature for estimating the np pairing energy lead to similar results. Significant differences between the calculation methods arise when nuclei with N = Z are considered, which allows to reveal the complexity of neutron-proton correlations in different types of atomic nuclei and to make assumptions on the correspondence of the mass relation to the real effect of np pairing. The Shell Model parametrization of the binding energy makes it possible to draw additional conclusions on the structure of mass formulas and their relationship.     

Cellulose conversion to polyols in subcritical water

Subcritical water is shown to be an efficient medium for the cellulose conversion process to produce polyols. A novel type of Ru-containing hyper-crosslinked polystyrene (HPS)-immobilized catalyst is suggested. Application of the catalyst containing 1% Ru can achieve a total yield of sorbitol and mannitol of about 50%; that is comparable with the results obtained in the presence of more complex and, therefore, more expensive catalytic systems. The influence of both the process conditions and the catalyst properties on the target product yield is studied. The hydrolytic hydrogenation of cellulose in subcritical water using Ru-containing HPS-immobilized catalysts can become a base for novel technologies of cellulose biomass conversion and production of raw materials for chemical synthesis and industrial production of second generation biofuels.