Oxygen transport in the system niobium-uranium dioxide

Luch Technological Society. Translated from Atomnaya Énergiya, Vol. 71, No. 1, pp. 62–64, July, 1991.     

Thermodynamic modeling of oxygen dissolution in uranium mononitride at 900–1400 K

Thermodynamic modeling of oxygen dissolution in uranium mononitride in relation to temperature showed that the solubility limit of oxygen in uranium mononitride monotonically increases from 0.0008 to 0.0092 at. % as the temperature is increased from 900 to 1400 K. The presence of a carbon impurity increases the oxygen solubility in uranium mononitride by a factor of 4–5. The oxygen solubility increases by 20–30% as the stoichiometric coefficient in uranium mononitride containing a carbon impurity is decreased by 0.005.     

Particle Dynamics in a Fluid Under High Frequency Vibrations of Linear Polarization

The paper deals with the investigation of a behavior of a system of particles suspended in a fluid in a container subjected to high frequency translational vibrations of linear polarization. Pair interaction forces act on the particles under these conditions. These forces decrease with the distance and depend on the interacting particles orientation with respect to the vibration direction. The presence of these forces leads to the formation of structures in space. The problem is solved numerically using molecular dynamics method with pair interaction approximation. It is shown that the process of the structures formation consists of the fast stage of compact cluster formation and slow evolution of these clusters. It is found that for vibrations of linear polarization the particles form the chains oriented perpendicular to the direction of vibrations. At long time-scales these chains form the layers perpendicular to the direction of the vibrations and located almost periodically all over the fluid volume.     

Stability of Plane-Parallel Pulsational Flow of Two Miscible Fluids under High Frequency Horizontal Vibrations

Linear stability of plane-parallel pulsational flow of two miscible fluids in a horizontal layer subjected to high frequency horizontal vibrations is investigated neglecting viscosity and diffusion. Long-wave instability is studied analytically and instability to the perturbations with finite wavelength—numerically.     

A virtual instrument for determining basic parameters of sinusoidal signals in stationary modes

A virtual instrument is proposed for determining the frequency, amplitude, and initial phase of sinusoidal signals of voltage and current, as well as the angle of phase shift between the voltage and current, that is created in the LabVIEW development environment. Comparative analysis of errors of the proposed instrument and the standard virtual instrument Extract Single Tone Information VI from the LabVIEW package was performed, which has shown that the proposed instrument determines the signal parameters more accurately than the standard one if the signals are exposed to industrial noise and interferences.