Szabolcs Varga

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We study a binary mixture of hard spherocylinders with the same diameter (D) and di†erent length (L 2[ L 1 in the absence and presence of a static external electric (magnetic) Ðeld on the basis of the Onsager theory. In the zero Ðeld, we Ðnd that the usual isotropicÈnematic phase transition takes place only between the length ratio of 1È2.9, the reentrant(More)
INTRODUCTION According to several empirical studies, mental well-being is significant in adolescence; adolescent's social network is undergoing radical changes while at the same time depression is increasing. The primary goal of our study is to determine whether socioeconomic status (SES) is associated with mental health status of Hungarian adolescents and(More)
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)
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)
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 in to the database, expressing the shape and its meaning and handling them efj?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)
INTRODUCTION Adolescence is a life period of trying harmful habits. It is helpful for prevention to map youth's motivations. AIM The main goal of the present study was to investigate high school students' motivations related to alcohol and cigarette use. METHOD A questionnaire survey was performed in Debrecen including students from four high schools (n(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)