AiMT Volume 1 (2006), Issue 2

THE NEW SOLUTION ASPECTS OF ELECTRIC SMALL LOOP

René HARŤANSKÝ, Ladislav MATEJÍČKA

The paper deals with the vector potential calculation of an electric small loop. This type of integral occurs in antenna theory. Presented method is simpler than the standard method and makes the connection between the radiation theories of the point source at the far field and the loop at the near field.

Page: 5 to 12

PARTICLE MATERIALS EFFECTIVE AGAINST MICROWAVE RADIATION

Ladislav KLUSÁČEK

The laboratory measurements of the selected particle materials showed that S 244 carbon fibres, Chezacarb electro-conductive carbon black and CR 299 ground natural graphite had been effective when attenuating microwaves in a frequency range f ? (8-12) GHz, f ? (2-18) GHz, respectively. The transmittance was decreasing with the increasing thickness of the sample cell (i.e. with the increasing content of the particle material in the measuring path). The mixtures of polyamide fibres or viscose fibres with natural carbon graphite proved to be a suitable carrier of such particle material. The frequency transmittance reached the lowest values with the sample of the mixture containing 30 % of graphite.

Page: 13 to 26

APPLICATION OF ENERGETIC MATERIALS IN CIVILIAN SPHERE

František LUDVÍK

The aim of this paper is to acquaint the readers with civilian application of energetic materials, i.e. solid propellants when they are practically applied in different civilian spheres. These are successfully used for dynamic tests of different types of structures, or in those cases when they are used against the hailstorms damaging from time to time the agricultural products, which have to be replaced from other outer sources, as well as it is necessary to compensate the agricultural producers financial losses.

Page: 27 to 42

POSSIBILITY OF ANTIMISSILES GUIDANCE ACCURACY ENHANCEMENT AGAINST BALLISTIC MISSILE

Ivan HAMTIL, Lukáš HOZA

In this paper are presented some simulation results of antimissile guiding process on attacking short-range ballistic missile. In simulations, laws of antimissile guidance were defined using classical proportional guidance method or Bellman dynamic programming and optimal quadratic criteria of guidance process. It is evident, from comparing simulation results obtained by using both ways of antimissile controls, that usage of modern automatic control methods supported by digital technologies is the way, how to significantly improve accuracy of missiles guidance process, even on targets such as ballistic missiles.

Page: 43 to 51

THE EXAMPLES OF NUMERICAL SOLUTIONS IN THE FIELD OF MILITARY TECHNOLOGY

Dušan MAGA, René HARŤANSKÝ, Pavel MAŇAS

The paper is based on previous work of the authors, presented e.g. in [1]. The area of authors' interests is based on numerical solutions of electrical, magnetic or mechanical fields. The well known numerical methods are Finite Elements and Boundary Elements.

Application of these can be successfully done in special technologies or special equipment as high-torque low-speed machine suitable for manipulators or robots working in dangerous and aggressive environment, high-speed bearingless actuators designed for aggressive and explosive surroundings, as well as design and optimization of bridges, pontoons, etc. The bases of the Finite Element Method (FEM) and overview of the authors' most important results in this field of interest is presented in the following chapters. The used mathematical apparatus leads to identical compatible results which are independent from the used platform of computer application software.

Page: 53 to 65

INDEX OF SNIPERS' SHOOTING CAPABILITY

Róbert JANKOVÝCH, Jozef MAJTANÍK

The article presents a new principle of capability evaluation of armed forces snipers' shooting. The proposed method of shooting capability evaluation is original and the shooting process variability of individual snipers has been taken into account.

Page: 67 to 76

DIFFERENT WAYS OF JUDGING TRAFFICABILITY

Klára CIBULOVÁ, Šárka SOBOTKOVÁ

This article deals with the possibilities of terrain negotiation in extraordinary situations. In these situations the communications, appointed for this kind of movement, are not supposable to use. The use of detours is not always advantageous and facultative. Then it is necessary to judge, whether the vehicles are able to go through the terrain or not. Two of the possible methods, how to find out the trafficability of terrains, are described in this article as well as the trafficability factors.

Page: 77 to 87

ANALYTICAL - PROGNOSTIC MODEL OF THE TECHNIQUE OPERATION

Jozef MAJTANÍK, Pavel BENEŠ

The article introduces a dynamical model of the technique's operation (generally). The model enables to describe reciprocal structures of basic operational phenomena, analyse progress tendencies of operational coefficients and determine prognosis of a future progress of the technique's operation.

Page: 89 to 104

HYPERGROUPS OF INTEGRAL OPERATORS IN CONNECTIONS WITH TRANSFORMATION STRUCTURES

Šárka HOŠKOVÁ, Jan CHVALINA, Pavlína RAČKOVÁ

This contribution is a continuation of the paper [4] (here not defined concepts can be found there). It uses the results from it and the fact that the basic group of integral operators contains an invariant subgroup, which allows us to obtain a closed, invertible, reflexive and normal subhypergroup of the target transposition hypergroup. We will construct a discrete transformation hypergroup - in fact an action of hypergroup of integral operators on the space of continuous functions, which are created by Fredholm integral equations of the second kind, as a phase set.

Page: 105 to 117