Journal of Technical Physics  vol. 42, no. 1 (2001)
is the issue dedicated to Professor Czesław Rymarz
on the occasion of his 70th birthday.
 L. Solarz:
Seventieth anniversary of Professor Czesław Rymarz
Original Contributions
 E. Włodarczyk:
The closed form solution of the Darboux boundary value problem
for backward driving of solids by the high explosive
 Cz. Rymarz:
Differential geometry in modeling the microstructural material media
 D. Rogula, M. Sztyren:
Dynamics of flux lines in strongly anisotropic superconductors
 W.A. Trzciński, S. Cudziło:
Determination of metal acceleration abilities and detonation energy of
explosives from cylinder test
 S. Kozak:
Numerical analysis of phenomena in superconducting OGMS separator
 J. Cabański:
Exact method of solution of free vibrations problem
for onedimensional rheological structures
Brief Notes
 E. Danicki:
Points of vanishing slowness curvature of quartz and lithium niobate
 J. Zagrodziński:
Resonances of the open cavity
 J. Szczygłowski, A. Krawczyk, A. Roman, P. Kopciuszewski,
M. Kużmiński, W. Wilczyński:
The use of Bayesian analysis to the model of energy loss in magnetic materials
 E. Włodarczyk:
The closed form solution of the Darboux boundary value problem
for backward driving of solids by the high explosive
 The closed form solution of the Darboux boundary value problem, which occurs at the
backward driving solids by the condensed explosive, was obtained in this paper.
The constructed solution may be used, among other cases, for estimating the explosively
driven elements velocity of the casing and liner of the wedge hollow charge.
The solution may be applied for evaluation of the explosive active part in
the wedge shaped charge, too. These problems will be considered in the next paper.
Contents
 Cz. Rymarz:
Differential geometry in modeling the microstructural material media
 The paper contains considerations, which concern an application of differential geometry
to construction of a compatible theory of media with microstructure.
Technologies of modern materials create a need for modeling the processes and phenomena
occurring in such materials. Application of the differential geometry to this end is
justified, since this mathematical theory is concisely and logically formulated and
exhibits a high level of generality. Therefore the physical theories constructed with
application of the geometry are, as usual, very effective. In this paper, a short
introduction to the differential geometry is given. Further the outline of geometrical
theory of defected media is presented. Main part of the considerations has been devoted
to a construction of the micropolar media in a bundle space. The bundle space is a very
fruitful extension of the tangent space, because it is a Cartesian product of the classical
(Euclidean) space and the microstructural fiber space.
Contents
 D. Rogula, M. Sztyren:
Dynamics of flux lines in strongly anisotropic superconductors
 The dynamics of networks of quantized magnetic flux lines in superconductors is formulated
in terms of the anisotropic string model. The paper extends the static equlibrium theory
to the general timedependent phenomena. Quasistationary kinetic processes, as well as
strictly dynamical phenomena, involving the anisotropic effective inertial mass of
a string segment, are considered. The dynamical aspects of the directional instability
of strings are examined.
Contents
 W.A. Trzciński, S. Cudziło:
Determination of metal acceleration abilities and detonation energy of
explosives from cylinder test
 Cylinder test is performed for chosen high explosives of military interest.
Impulse Xray photography is used for recording of the process of acceleration
of a copper tube by detonation products. The dependence of the Gurney energy
on the volume of detonation products as well the detonation energy are established
on the basis of the cylinder test results. Calculated parameters are compared with
those obtained from a thermochemical code and from calorimetric measurements.
Contents
 S. Kozak:
Numerical analysis of phenomena in superconducting OGMS separator
 This paper presents a numerical analysis of phenomenon in the superconducting
OGMS separator. The OGMS separator should only deflect particles, but many of them
can be captured on the inner wall of separator. Presented results of the captured
material shape indicate a strong dependence on many separator parameters.
The presented methods using FLUX 2D and OPERA 2D for calculation of
the OMGS separator area can be adopted easily to solve other electromagnetic problems.
Contents
 J. Cabański:
Exact method of solution of free vibrations problem
for onedimensional rheological structures
 Free vibrations of onedimensional rheological structure have been described by the system
of the conjugated partial differential equations. A vector form of this system of equations
allows to identify the selfadjoint linear operators of inertia, damping and stiffness.
These operators are not homothetic, hence the method of a separation of variables for
the considered system of equations is applicable only in the introduced complex Hilbert space.
Such a separation of variables leads to the system of ordinary differential equations in time
and to the system of three ordinary differential equations with respect to spatial variables.
Solution of the obtained boundaryvalue problems proceeds in a classical way, however,
the results are of a complex conjugated type. Applying the fundamental principle of the general
orthogonality of complex eigenvectors, the problem of free vibrations of the system with
arbitrary initial conditions was solved in exact form.
Contents
 E. Danicki:
Points of vanishing slowness curvature of quartz and lithium niobate
 There are points on the slowness surface of anisotropic crystals which cannot be
satisfactorily described with standard Gaussian curvatures. The paper presents complete
sets of such points in quartz and lithium niobate, and also certain extraordinary points
in Rochelle salt. The method of their evaluation and verification is presented briefly.
Contents
 J. Zagrodziński:
Resonances of the open cavity
 Resonant states in an open cavity, i.e. where the electromagnetic field is described
by a continuous spectrum, are considered. Such a situation appears when coupling with
a surrounding world is not neglected. The idea is a natural continuation of a classical
potential scattering theory, but in a vector version. Formulating a scattering problem
with a unitary scattering operator (for nondissipative systems and for normalized incident
and reflected waves), the energy stored in a finite volume is determined by the phase
y of the reflection coefficient being an eigenvalue of
the scattering operator. The causality principle gives rise to the resonant states of
the system as the real frequencies when the derivative of this phase with respect to
the frequency  dy/dw
reaches its maxima. The general statements are illustrated by some examples and,
in the simplest form, the same technique was used in the past for measurements of
microwave cavities.
Contents
 J. Szczygłowski, A. Krawczyk, A. Roman, P. Kopciuszewski,
M. Kużmiński, W. Wilczyński:
The use of Bayesian analysis to the model of energy loss in magnetic materials
 The paper aims at coupling energy losses in magnetic materials and their domain structure.
The Bayesian analysis has been used in order to make it. The analysis has led to analytical
formula for the calculation of energy losses as a function of domain width.
It is a good departure point for solving an inverse problem, i.e. looking for domain structure
on the basis of the data obtained from measurement of bulk parameters.
Contents
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