Physics for Economy

STRUCTURE OF VITAMIN K AND ITS SIGNIFICANCE IN MEDICINE

2024-02-16T07:32:10+00:00

Quinones and its derivatives – vitamin K are well known species in medicine. The chemical structure, configurational isomerism of vitamin K and the differences in the biological activity is shown in this paper.

OPTICAL FEEDBACK. II DYNAMIC EFFECTS.

2024-10-07T09:41:20+00:00

In the present paper the mathematical model, introduced by Crutchfield [1], for video feedback performance is outlined. The two dynamical fractals observed in our video feedback experiment have been described. The first one shows the five-fold symmetry. Its spatial form relates well to the one which was simulated numerically by Andersen [2]. The second one consists of black strips with dislocations and rotates with the velocity of 0.2 1/s^-1. The spatial form looks like a modern picture and its spatial time evolution correlates well with Chopin music.

TRIGLYCINE SULPHATE (TGS) – MATERIAL FOR ACTIVE DETECTORS OF INFRARED RADIATION

2024-10-09T08:35:07+00:00

In the article we present the current state of research on triglycine sulfate (TGS) – one of the flagship materials used in active thermal detectors of infrared radiation (IR). A description of the second-order phase transition in TGS is provided. The methods for measuring the relevant electrical parameters of IR sensors based on TGS are presented, focusing on their application in thermal detection of IR radiation. The article is based on available literature and the results of our own research.

THEORETICAL BASIS OF THE LASER REFLECTION METHOD OF MEASURING THE RADIUS OF CURVATURE OF CIRCULAR-SYMMETRICAL LENSES

2024-12-19T09:18:04+00:00

In this paper, a theoretical analysis of the laser reflection method for measurement of the radius of curvature for a circular-symmetric lenses was carried out. The measurements of the radius of curvature for a spherical and aspherical lenses were taken. The use of the criterion function in the calculation for minimalization of the uncertainty of radius curvature for a spherical lens has been demonstrated. The parameters of the function describing measurements and minimizing their uncertainty were determined.