Hydrogen-Helium Mixtures at High Pressure

The properties of hydrogen-helium mixtures at high pressure are crucial to address important questions about the interior of Giant planets e.g. whether Jupiter has a rocky core and did it emerge via core accretion? Using path integral Monte Carlo simulations, we study the properties of these mixtures as a function of temperature, density and composition. The equation of state is calculated and compared to chemical models. We probe the accuracy of the ideal mixing approximation commonly used in such models. Finally, we discuss the structure of the liquid in terms of pair correlation functions.Comment: Proceedings article of the 5th Conference on Cryocrystals and Quantum Crystals in Wroclaw, Poland, submitted to J. Low. Temp. Phys. (2004

Regression Models of Koch Wire Dipole Performance

A family of balanced wire dipoles with the geometry of arms similar to the first-order Koch pre-fractal is considered. Regression and correlation analysis is performed for parameters defining the geometry of the considered antennas and their electrodynamic characteristics. A high degree of correlation of the base frequency and bandwidth with the dipole wire length is obtained. Regression models are developed for some of the electrodynamic characteristics of the antenna. Possibility of structural and parametrical synthesis of the wire antenna with predefined properties on the basis of regression models is shown