We theoretically suggest and experimentally demonstrate a broadband composite optical rotator that is capable of rotating the polarization plane of a linearly-polarized light at any chosen angle. The device is composed of an even number of half-wave plates rotated at specific angles with respect to their fast-polarization axes. The frequency bandwidth of the polarization rotator in principal increases with the number of half-wave plates. Here we experimentally examine the performance of rotators composed of two, four, six, eight and ten half-wave plates.

We propose a universal scheme for the construction of a device for arbitrary to arbitrary polarization transformation, which consists of two quarter-wave plates and two Faraday rotators. Using this device, one can continuously change the retardance and the rotation angle simply by changing the magnetic fields in each Faraday rotator.

This article presents a study of mental resilience, stability (emotional intelligence), and in particular the levels of aggressive response, according to the practices of judo, fitness, basketball, and tennis by students at Sofia University. The levels of aggression as an indicator of students' ability to manage, influence and control their emotions, attitudes, behaviours and the mental and volitional state of the individual were examined with the questionnaire of Bues&Durke. The study aims to determine, through the levels of aggressive reaction and depression, what is the impact of the sports of judo, fitness, basketball, and tennis practiced at the University of Sofia for the students' mental stability, stability (emotional intelligence). The object of study is the level of physical aggression of students practicing these sports. The subject of the study is the levels of mental resilience of students practicing judo, fitness, tennis, and basketball, broken down by gender, faculty, and age. As a result of the study, it can be summarized that physical aggression can and should be corrected. Family is the main factor that educates the individual and sets his or her direction of development, but sports at the University can correct and compensate for family gaps.

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We examine theoretically the adiabatic solution for the motion of a classical charged particle in spatially uniform and nonuniform static magnetic fields. Our approach benefits from fields like nuclear magnetic resonance and quantum optics, where similar mathematical problems to what we encounter in this work have already been solved.