Szabolcs Varga

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The extension of Onsager's second-virial theory [L. Onsager, Ann. N.Y. Acad. Sci. 51, 627 (1949)] for the orientational ordering of hard rods to mixtures of nonspherical hard bodies with finite length-to-breadth ratios is examined using the decoupling approximations of Parsons [Phys. Rev. A 19, 1225 (1979)] and Lee [J. Chem. Phys. 86, 6567 (1987); 89, 7036(More)
We report experimental measurements of the phase behavior of mixtures of thin (charged semiflexible fd virus) and thick (fd-PEG, fd virus covalently coated with polyethylene glycol) rods with diameter ratio varying from 3.7 to 1.1. The phase diagrams of the rod mixtures reveal isotropic-nematic, isotropic-nematic-nematic, and nematic-nematic coexisting(More)
Motives may be an important influence for substance use among youth. The goal of this research was to study the relation of social, self-enhancement, boredom relief and affect regulation motives to smoking and drinking in a sample of Eastern European high school students and to examine variation in the effects of these motives by gender. Our sample involved(More)
This paper presents a new approach of modeling Video Scenes by adding meaning t o the shape of real world objects and simplifying it. I n order to store shapes and/or motions of objects that appear in real world scenes into the database, expressing the shape and its meaning and handling them ef-j?ciently are indispensable. For that purpose, we introduce a(More)
The effect of confinement on the positional ordering is examined in a system of parallel hard cylinders using the second virial theory of Onsager. Hard cylinders are arranged in a slit-like pore (two parallel planar hard walls) in such a way that the long axes of the particles are perpendicular to the surface of confining hard walls. We have incorporated(More)
We examine the ordering properties of rectangular hard rods with length L and diameter D at a single planar wall and between two parallel hard walls using the second virial density-functional theory. The theory is implemented in the three-state Zwanzig approximation, where only three mutually perpendicular directions are allowed for the orientations of hard(More)
The phase behavior of the system of parallel rigid triblock copolymers is examined using the second virial density functional theory. The triblock particle consists of two identical infinitely thin hard rods of finite lengths on the opposite ends of one central hard cylinder with nonzero length and diameter. Stability analyses and free energy calculations(More)
The orientational ordering and the tilt angle behavior of a one-dimensional fluid of hard zigzag needles are examined by means of transfer matrix method and Onsager theory. The centers of mass of the particles are restricted to a line, while the orientational unit vectors are allowed to rotate freely in two dimensions. It is shown that zigzag needles do not(More)
The fundamental nature of the nematic-nematic phase separation in binary mixtures of rigid hard rods is analyzed within the Onsager second-virial theory and the extension of Parsons and Lee which includes a treatment of the higher-body contributions. The particles of each component are modeled as hard spherocylinders of different diameter , but equal length(More)
Citation: Pereira PR, Varga S, Oliveira AC and Soares J (2015) Development and performance of an advanced ejector cooling system for a sustainable built environment. Ejector refrigeration is a promising technology for the integration into solar driven cooling systems because of its relative simplicity and low initial cost. The major drawback of such a(More)