JUBILEE: MILKA DZHIDZHOVA, A TEACHER

OUR EXPERIENCE IN ASTRONOMY LEARNING

PARAMETRIC INTERACTION OF OPTICAL PULSES IN NONLINEAR ISOTROPIC MEDIUM

In present work the parametric interaction of two optical waves presented by their slowly varying amplitude functions \(A_{1}(z)\) and \(A_{2}(z)\) in isotropic nonlinear medium is investigated. The corresponding system of nonlinear amplitude differential e...

INVESTIGATION OF POLYMER MATERIALS BY MEANS OF ELECTRO-ACOUSTICAL PULSE-ECHO METHOD AND EDDY CURRENT METHOD

We have examined eight types of optical polymer plates including polymethyl methacrylate (PMMA) which is preferred material for ultrasonic purposes. Their longitudinal ultrasonic velocity and attenuation coefficient have been determined by means of pulse-ech...

UNIFYING THE ANALYTICAL SOLUTIONS OF THE GEODESIC EQUATIONS IN BONDI-GOLD-HOYLЕ UNIVERSE MODEL

In this paper, we unify the study of the geodesics in the BondiGold-Hoyle universe model. Thus, we obtain analytical solutions of the geodesic equations which describe the motion of space-like, time-like and light-like particles in the considered model. I...

GAMMA RADIATION AND ITS EFFECT ON DEOXYRIBONUCLEIC ACID

A concise review of the effect of gamma radiation on the living organisms is presented. The medical topics of the problem are elucidated and commented.

RADIATION PROTECTION

In this article the classification of incidents and accidents when working with sources of ionizing radiation (SIR) is discussed. Also are considered the important measures and actions laid down in the Bulgarian legislation for prevention of nuclear incidents...

COMPARATIVE ANALYSIS OF CONTAINING NATURAL RADIONLUCLESINTHE HERBS CALENDULAOFFICINALIS L. AND MATRICARIA CHAMOMILLA L.

The healing power of many plants has been known since ancient times and it is used until nowadays all over the world. The herbs <i>Calendula officinalis L.</i> and <i>Matricaria chamomilla L.</i> are among the most commonly used herbs. The article mentions...

SOME PHYSICAL FACTORS INFLUENCING THE AZOBENZENE POLYMERS PROPERTIES

Photonisotropic materials can be divided into two main groups: inorganic and organic materials. Polymers containing organic dyes are the subject of multiple studies in both areas of physics and medicine. Optical storage in azobenzene-containing polymers is ba...

STABILITY OF EMULSIONS FROM TYPE OIL/WATER WITH CONJUGATED LINOLEIC ACID

The model emulsion systems from type oil / water with oil phase refined sunflower oil type “Classic” and water phase – deionized water and conjugated acid (CLA) – have been studied. The purpose of this paper is to investigate the stability characteristics of m...

THE EFFECT OF EXTRA VIRGIN OLIVE OIL ON THE HUMAN BODY AND QUALITY CONTROL BY USING OPTICAL METHODS

There are many substances in extra virgin olive oil (EVOO), of which many have a beneficial effect. One of the most interesting substances in EVOO is Oleocanthal. This substance is first recognised in 2005 and can only be found in EVOO. Under further inves...

INFRARED THERMOGRAPHY FOR DIAGNOSTICS OF FOCAL INFECTION

Focal infection is a present hidden infection inside the body that is not strong enough to cause symptoms and most often patients don’t know about its presence. By the physiological paths the organism can suppress it, but when a decrease in the immune protec...

THE PHYSICS EXPERIMENT AND ITS ROLE IN FORMING OF PRACTICAL SKILLS INMILITARY STUDENTS

In 2017/2018 school year in the new curriculum of the subject “Protection of Population and Infrastructure” for the first time will appear discipline “Applied Physics”. It focuses on practical-applied knowledge in physics and its application in different situ...

ELECTRICAL PROPERTIES OF POLYLACTIC ACID COMPOSITE FILMS

In the present study, some electrical properties of polylactic acid (PLA) composite films with different percentages of \(\mathrm{MgO}-0 \mathrm{wt} \%, 2 \mathrm{wt} \%, 4 \mathrm{wt} \%\) and \(8 \mathrm{wt} \%\) were investigated. Composite films were p...

NINE HYPOTHETICAL PROBLEMS FOR LINKAGE BETWEEN QUALITATIVE ANALYSIS AND STOICHIOMETRIC CALCULATIONS

On the science or the chemistry education, it is one from the most important problems for both the science teachers and the students to design the linkage between ones information and other information as well. The aim of this study is hypothetically to mode...

MATHEMATICAL MODELING AND EFFECT OF ISOTHERMAL DRYING ON MUSHROOM (BOLETUS PINOPHILUS)

Eleven kinds of mathematical models were used to obtained moisture data. From obtained results, the semi-theoretical models chosen in this work proved to be quite good to describe the drying behavior of isothermal drying. In the experiment, Modified Henderso...