Review Paper
 H.K. Lachowicz:
Magnetic materials  progress and challenges
Military Applications
 E. Włodarczyk:
Active mass of high explosive in the wedgeshaped charge
 W.A. Trzciński:
Application of a cylinder test for determining
energetic characteristics of explosives
 E. Włodarczyk:
Effectiveness of the cylindrical hollow charge
 J. Owsik, S. Usherenko, M. Meyers and A. Zarwalska:
Analysis of shock interaction under super deep penetration effect
 Z. Koruba:
Adaptive correction of controlled gyroscope on the deck of aerial object
 R. Dulski, T. Niedziela and H. Polakowski:
Application of thermalscene modelling to testing of decision algorithms
 Z. Dżygadło and G. Kowaleczko:
Nonlinear regular and chaotic dynamics of a helicopter
Brief Notes
 D. Rogula and T. LenkowskaCzerwińska:
Alternating states in layered highT_{c} supeconductors
 J. Janucki and J. Owsik:
Optimisation of a rectangularprofile diffraction grating
 H.K. Lachowicz:
Magnetic materials  progress and challenges
 The present paper gives a review of novel magnetic materials and magnetic thin film
structures, the latter ones utilized mainly in magnetic recording technology. The survey
is divided into three sections describing magnetically soft, semihard and hard
materials, respectively. At the beginning of each section a brief history of the
materials of the above classes is presented, whereas at the end, the research efforts
towards invention of novel materials or improvement of the existing ones are described.
Contents
 E. Włodarczyk:
Active mass of high explosive in the wedgeshaped charge
 The algebraic formulae, determining the active mass of the high explosive (HE)
in the wedgeshaped charge warhead have been derived in the paper. Influences of the
casing and liner inertia of the wedge cumulative warhead as well as of the liner shape on
the active mass of the HE have been analysed. The presented simple formulae may be used
by the engineers designing the shaped charges.
Contents
 W.A. Trzciński:
Application of a cylinder test for determining
energetic characteristics of explosives
 In the work expressions for an expansion work and detonation energy of
condensed explosives are derived from a quasistatic cycle for detonation. New
semiempirical methods of determination of the acceleration ability of detonation
products and the detonation energy are proposed. The basis of the methods is a socalled
cylinder test. The procedures of applying the cylinder test data for determining the
acceleration ability (socalled Gurney energy) and for estimation of the detonation
energy are described. The method proposed for evaluation of the detonation energy is
verified by using the cylinder test data given in literature for 17 explosives.
Contents
 E. Włodarczyk:
Effectiveness of the cylindrical hollow charge
 The influence of the cavity shape of the cylindrical cumulative charge on its
effectiveness in destruction activity has been analysed in this paper. It is proved that
the value of the efficiency coefficient h of the cylindrical
hollow charge is determined, among other things, by the dimensions and the shape of the cavity.
The values of the efficiency coefficient, for real hollow charges, are contained within the
interval 1/9³m³1/5.
The maximum active mass of the cylindrical hollow charge is described by the formula:
m_{a} = p r_{0}^{3}r_{e}/3,
where r_{0} is the radius of the cylindrical hollow charge,
and r_{e} denotes the density of an explosive.
Contents
 J. Owsik, S. Usherenko, M. Meyers and A. Zarwalska:
Analysis of shock interaction under super deep penetration effect
 When macrobodies undergo collision, macrocraters are formed for which the
ratio of crater's depth to striker diameter does not exceed 10. At the end of the 70's,
an anomalous effect of formation of microcraters with relative depth of about
10^{2}10^{4} of particle size has been detected. Analysis of the experimental
results made it possible to reveal the existence of a narrow impact interaction zone
within which craterschannels are produced with a good repeatability. Evidence of a
limited relative depth under macroimpact is explained by restrictions imposed by energy
intensity of impact interaction in a barrier material.
Contents
 Z. Koruba:
Adaptive correction of controlled gyroscope on the deck of aerial object
 The paper presents the most general mathematical model of dynamics of the
controlled gyroscope on the movable base (the deck of an aerial object). The method of
the gyroscope system error correction employed an algorithm based on the idea of
iteration procedure of the control of a nonlinear object of hardly known properties,
which is affected by interference.
Contents
 R. Dulski, T. Niedziela and H. Polakowski:
Application of thermalscene modelling to testing of decision algorithms
 A way for the use of thermalscene modelling to testing of decision algorithms
for systems of automatic recognition in infrared is proposed. Taking two algorithms as an
example, probabilities of detection and false alarm as a function of the signal threshold
level and target observation angle are determined. The results of computations presented
have been obtained by means of the authors' software.
Contents
 Z. Dżygadło and G. Kowaleczko:
Nonlinear regular and chaotic dynamics of a helicopter
 A helicopter is a rotorcraft, which can be subjected, during its motion, to
various types of vibrations. This paper presents selected results of analysis of these
vibrations. It is carried out on the basis of the complete set of nonlinear differential
equations describing the helicopter fuselage motion and all the blades motions. For the
helicopter performing a steadystate flight, the control law for static autopilot is
formulated on the basis of the method of motions separation. In the case of a ground
resonance the forces and moments produced by a landing gear are taken into consideration.
The flutter phenomenon is also simulated. Some results of numerical analysis are
presented, which show that some oscillations are regular and others have rather a chaotic
character.
Contents
 D. Rogula and T. LenkowskaCzerwińska:
Alternating states in layered highT_{c} supeconductors
 The coupling between lattice distortion modes and the superconducting order
parameters for the layered, high temperature superconductors of La214 class is
considered. The set of structural microorder parameters is determined on the ground of a
model of coupled quasirigid CuO_{6} octahedra. The admissible combinations of the
superconducting microorder parameter components are presented. The time reversal
symmetry of microscopic and macroscopic states due to correlation between structural and
superconducting order parameters is discussed.
Contents
 J. Janucki and J. Owsik:
Optimisation of a rectangularprofile diffraction grating
 Analysis of properties of a diffraction grating used as a power splitter of
laser radiation has been presented. Results of numerical calculations of diffraction
grating characteristics as a function of their geometrical parameters, wavelength of
radiation and incidence angle of the laser beam have been shown. Conclusions concerning
the designs of radiation splitters have been formulated.
Contents
Reprints of the full papers may be obtained from their authors.
Contact Editorial Office in case you need
the address of the respective author.
