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1
Content available remote

Real-Time Spectroscopy of Acoustic Waves or Music as Physical Phenomenon

100%
Zieliński P.
Acta Physica Polonica A
|
1996
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vol. 89
|
issue 2
265-271
EN
The sounds used in music have discrete spectra consisting of a fundamental frequency and of its integer multiples. This is the reason for an affinity of the sounds for which the ratio of the fundamental frequencies is given by a fraction of small integers. Two possible physical mechanisms for this affinity are discussed: (1) an influence of beats between some partial tones and (2) nonlinear interactions between partial tones. Some facts from the music theory are then explained as resulting from the invariance of the most consonant intervals between affine sounds against variations of the timbre and of the register. An analogy is indicated between the classical cadence and the lock-in effect in incommensurate crystals. The lecture is illustrated with extracts from the J.S. Bach Das Wohltemperierte Klavier, the W.A. Mozart sonata for piano KV 570 and a recitative from the Haendel Messiah.
2
Content available remote

Review of Surface Relaxation and Reconstruction Phenomena

100%
Zieliński P.
Acta Physica Polonica A
|
1996
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vol. 89
|
issue 2
251-263
EN
The basic definitions concerning structure of surface are given. The principal experimental methods of the observation of surfaces are reviewed. A possibly heuristic explanation is given of principal theoretical concepts underlying the present understanding of the surface phenomena. The best known and/or understood examples of the surface relaxation, surface reconstruction and roughening are reviewed.
3
Publication available in full text mode
Content available

Investigations of Fatigue of Asphalt Layers with Geosynthetics

100%
Zieliński P.
Archives of Civil Engineering
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2013
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issue 2
4
Publication available in full text mode
Content available

Indirect tensile test as a simple method for rut resistance evaluation of asphalt concrete

89%
Zieliński P., Zieliński P.
|
2019
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vol. 65
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issue 3
5
Publication available in full text mode
Content available

Investigation of geosynthetic interlayer bonding in asphalt layers

89%
Zieliński P., Zieliński P.
Archives of Civil Engineering
|
2011
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issue 4
6
Content available remote

Surface True and Leaky Waves in Subsonic and Supersonic Regions. Explicit Solution of a Simple Model

64%
Trzupek D., Zieliński P.
|
|
issue 4
570-573
EN
A simple model of a surface of a 2D continuum is shown to exhibit subsonic and supersonic surface resonances (leaky waves, pseudosurface waves), i.e. finite-lived excitations, along with usual surface waves (true subsonic surface waves). The physical meaning, controversial in the existing literature, of the surface leaky waves in both regions is discussed by a thought experiment in which a stimulus adjusted to the resonance parameters is applied to the surface. The infinite displacement-stimulus ratio in the long-time limit then is shown to be in power in all the cases of surface states and a finite amplitude of the leaky waves is demonstrated despite an apparent divergence suggested by their algebraic form.
7
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Study of Order Parameters Coupling in Uniaxial Ferroelectrics on the Basis of Pyroelectric and Dilatometric Measurements

64%
Gałązka M., Zieliński P.
|
|
issue 4
566-569
EN
A method is devised of extracting the explicit form of the coupling between the primary and secondary order parameters with the use of experimental data and respecting classical and non-classical values of the effective critical exponents. The corresponding equation of state stems from the Ising model on a compressible lattice treated within the mean field approximation supplemented with terms ascertaining scaling invariance in the vicinity of the critical point. The theory is exemplified by the molecular ferroelectric crystals (CH_{3}NH_{3})_{5}Bi_{2}Cl_{11} (MAPCB) and (CH_{3}NH_{3})_{5}Bi_{2}Br_{11} (MAPBB).
8
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Nonclassical Critical Behaviour and Low Temperature Anomalies in Ferroelectric DMACA as Described by Many-Sublattice Model

64%
Gałązka M., Zieliński P.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
1013-1019
EN
A model based on the crystallographic data on dimethylammonium nonachlorodiantimonate (DMACA) is constructed. Gradual orientational ordering of three inequivalent sublattices of the dimethylammonium cations is shown to be at the origin of the anomalous behaviour of the spontaneous polarisation in this material. A quantitative comparison with the experimental data reveals a temperature dependence of a coupling between two sublattices and a strong deformability of the underlying structure.
9
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Stress Induced Phononic Properties and Surface Waves in 2D Model of Auxetic Crystal

52%
Trzupek D., Twaróg D., Zieliński P.
Acta Physica Polonica A
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2009
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vol. 115
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issue 2
576-578
EN
Elastic stiffness parameters are determined in a 2D model system of rigid rods interacting by harmonic force constants. Any positive ("normal" crystal) or negative (auxetic crystal) Poisson ratio can be obtained in this model as a function of the external stress. Conditions for opening an absolute stop band (phononic crystal) and for various kinds of surface waves are obtained.
10
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Solid State Polymorphism and Dynamics οf 2,2-Dimethylbutan-1-ol as Studied by Adiabatic Calorimetry and Dielectric Spectroscopy

52%
Juszyńska-Gałązka E., Zieliński P., Massalska-Arodź M., Krawczyk J.
Acta Physica Polonica A
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2013
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vol. 124
|
issue 6
917-925
EN
2,2-dimethylbutan-1-ol, known as neohexanol, was studied by adiabatic calorimetry and dielectric spectroscopy. Details of complex solid state polymorphism and relaxational dynamics were identified and described. System of phases of neohexanol was found to be monotropic with three orientationally disordered crystalline phases besides isotropic liquid and ordered crystal. Moreover, two subsequent glass transition anomalies of heat capacity C_{p}(T) were detected on heating in one of the supercooled orientationally disordered crystalline phases. Thermodynamical properties of neohexanol are described in relation to the dielectric relaxation processes found.
11
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Calorimetric and Positron Lifetime Measurements οf Hydrogenated Carbon Nanocones

52%
Budziak A., Dryzek J., Krawczyk J., Zieliński P.
|
|
issue 4
574-577
EN
Two carbon nano-structured samples containing 5 and 20% of carbon nanocones in their volume were investigated. Using the Sieverts apparatus the hydrogen was loaded into the samples. The measurements of heat capacity in the temperature range from 100 K to 320 K and the positron lifetime measurements at the room temperature were performed for hydrogenated and non-hydrogenated carbon nanocones. The desorption of hydrogen at the temperature of 230 K is deduced from the heat capacity measurements. The detection of the positronium, the bound state of positron and electron, in the measured samples reveals the presence of open volume defects of ca. 0.198 ± 0.002 nm.
12
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Surface Dynamics and Phononic Properties of 2D Field Tunable Auxetic Crystal

52%
Twaróg D., Trzupek D., Zieliński P.
Acta Physica Polonica A
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2009
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vol. 115
|
issue 2
579-582
EN
The lattice in-plane dynamics is studied as a function of external field in a model of auxetic crystal consisting of rigid polar rods and of elastic springs. The phase speed of the transverse acoustic wave propagating parallel to the polar rods is shown to be higher than the speed of the longitudinal wave at strong fields. An absolute stop band for the lattice waves opens in the whole Brillouin zone with increasing field. The surface waves and resonances at a surface parallel to the rods are studied. Infinitely narrow resonances called exceptional surface waves are found within bulk bands at certain specific values of the parameters characterizing the surface. Generally, the surface layer should be significantly heavier and stiffer than the substrate for the phenomenon to occur.
13
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The Solid State Polymorphism and Dynamics of 2,3-Dimethylbutan-2-ol (2,3-DM-2-B)

52%
Juszyńska E., Massalska-Arodź M., Zieliński P., Krawczyk J.
Acta Physica Polonica A
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2012
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vol. 122
|
issue 4
693-697
EN
In the paper we present adiabatic calorimetry and dielectric spectroscopy results for 2,3-dimethylbutan-2-ol (2,3-DM-2-B), one of the isomers of neohexanol. For 2,3-DM-2-B we have detected the following phase transitions: C2 (249.8 K) → C1 (262 K) → Is. No glass phase was found. In both crystalline phases C2 and C1 three relaxation processes were detected. These processes are discussed in relation to the calorimetric studies.
14
Content available remote

Impulse and Resonant Response in Systems Showing Secular and Leaky Excitations

52%
Sobieszczyk P., Gałązka M., Trzupek D., Zieliński P.
Acta Physica Polonica A
|
2013
|
vol. 124
|
issue 6
1020-1024
EN
A model consisting of a string embedded in an elastic medium and terminated by a harmonic oscillator has been studied in the frequency and time domains to elucidate the physical effects of supersonic and subsonic leaky waves as well as that of true surface waves. A supersonic leaky wave manifests itself by a resonant maximum of the local density of states within the band of bulk waves and by an anomalous dispersion of the real part of the frequency dependent response function. The time domain impulse response then contains mainly resonant contribution from the poles of the response function in analogy to ordinary resonances. True surface waves show generally analogous behaviour. Here, however, the phenomenon is governed by dissipation mechanisms different from the radiation into the bulk. An important difference is that the impulse response contains equilibrated contributions due to the poles and due to the stop frequency gap in the case of true surface waves. The main manifestation of a subsonic leaky wave, i.e. a surface resonance with the frequency situated in the stop gap, is a sharp peak of the real part of the frequency-dependent response function just at the bottom of the bulk waves band. This is in certain analogy with a large reactive power in electric circuits. A strong destructive interference of the resonant part of the impulse response with the part due to the gap makes the time domain response fast attenuated.
15
Content available remote

On Surface Waves in Materials with Negative Poisson Ratio

52%
Zieliński P., Twaróg D., Trzupek D.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 2
513-515
EN
True surface wave, i.e. a resonance with infinite lifetime is found within a bulk band in a model of thin planar layer coating a continuous auxetic substrate. Conditions for the existence of this wave are given.
16
Content available remote

Magnetoelectric Properties of 0.3Bi_{0.95}Dy_{0.05}FeO_3-0.7Pb(Fe_{2/3}W_{1/3})O_3 Multiferroic

45%
Stoch A., Stoch P., Kulawik J., Zieliński P., Maurin J.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 1
128-130
EN
Pb-based complex perovskites with Fe^{3+} like Pb(Fe_{2/3}W_{1/3})O_3 were found to be interesting because of their unique properties such as relaxor and magnetoelectric behavior. Pb(Fe_{2/3}W_{1/3})O_3 is ferroelectric with ferroelectric Curie temperature T_{C} between 150 and 200 K and at the same time is antiferromagnetic with magnetic Néel temperature about 400 K. BiFeO_3 is a well known perovskite compound which exhibits ferroelectric (T_{C} = 1103 K) and antiferromagnetic (T_{N} = 643 K) ordering simultaneously. The polycrystalline sample of 0.3Bi_{0.95}Dy_{0.05}FeO_3-0.7Pb(Fe_{2/3}W_{1/3})O_3 were synthesized using standard sintering procedure. Magnetization vs. magnetic field (at 4.2 K) curves were measured. Magnetoelectric properties of the sample were obtained.
17
Content available remote

Photo-Induced Relaxation of Magnetization in Molecular Magnet

39%
Zieliński P., Tracz P., Podgajny R., Pełka R., Bałanda M., Wasiutyński T., Sieklucka B.
Acta Physica Polonica A
|
2007
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vol. 112
|
issue S
S-183-S-188
EN
The experimental study of photo-induced magnetization of hybrid molecular magnet containing cobalt(II) and tungsten(V) magnetic centers bridged by 4,4'-bpy and CN^- is presented. The observed increase in magnetization rate is attributed to the defects due to inter-valence transfer between Co^{II}W^V↔ Co^{III}W^{IV}. The time evolution of magnetization is parameterized by the power law rather than exponential function.
18
Content available remote

Infrared Spectroscopy in Molecular Study of the Piezoelectric Effect in Pig's Shin Bone

39%
Lipiec E., Kowalska J., Wiecheć A., Zieliński P., Kwiatek W., Iwaniec M.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 2
539-542
EN
Despite growing number of literature demonstrating the piezoelectric effect in bones at macro level there's still a lack of papers describing this effect at molecular level. In order to examine this effect more specifically, a study has been conducted to show the possibility of using infrared spectroscopy on samples contained in the electric field. This is the first known research on applying infrared spectroscopy to study the influence of electric field and compressive stress on bones' structure represented by the molecular IR spectrum. The samples used in this experiment as a model were prepared in pellet form, made from powdered pig's shin bone mixed with KBr (mass ratio of about 1:100). The spectra were obtained in transmission mode. Three different types of experiments were performed at each sample, which were subjected to: (a) fixed electric field (E < 40 kV/m), (b) variable electric field (0-40 kV/m), (c) compressive stress (P < 100 MPa). The obtained data have shown that the electric field and compressive stress on sample modified infrared spectra of the bone. Qualitative as well as quantitative changes in the spectral range between 900 cm^{-1} and 1200 cm^{-1} and the band at 562 cm^{-1} (PO_4^{3-} asymmetric and symmetric stretching, respectively) were observed. The relative area obtained by decomposition of the PO_4^{3-} band reaches an extreme value in the external compressive stress (10 MPa), that occur under physiological conditions. Based on presented data, it was proved that the applied factors (electric field, compressive stress) can change the oscillation energy and the number of molecule's degrees of freedom.
19
Content available remote

Resonant Phonons in Adsorbates

39%
Dobrzynski L., Djafari Rouhani B., Zieliński P., Akjouj A., Sylla B., Oumghar E.
Acta Physica Polonica A
|
1996
|
vol. 89
|
issue 2
139-144
EN
After a brief review on surface phonons, we focus on resonant phonons in adsorbed thin layers. Such resonances may in general be understood within the substrate bulk band as thin layer modes shiften and broaden by the interaction with the substrate phonons. These resonant phonons appear as well-defined peaks in the phonon density of states. Their experimental study started recently by Helium atom scattering spectroscopy. This review will end by a prospective revue done mostly after the presentation of two unpublished results. First the slab resonant phonons may almost be confined in the surface slab even for frequencies falling within the bulk phonon band, if the surface slab is separated from the substrate by a buffer layer. The other prospective unpublished result deals with a model system in which the propagating phonons reach a space point from which they can continue to propagate through two different finite in space channels before reaching again a homogeneous uniform path. Such a system exhibits some frequencies for which the transmission factor vanishes. This phenomenon is related to the resonances associated with the finite additional path offered to the propagation of the phonons.
20
Content available remote

Magnetic Systems at Criticality: Different Signatures of Scaling

27%
Pełka R., Konieczny P., Fitta M., Czapla M., Zieliński P., Bałanda M., Wasiutyński T., Miyazaki Y., Inaba A., Pinkowicz D., Sieklucka B.
Acta Physica Polonica A
|
2013
|
vol. 124
|
issue 6
977-989
EN
Different aspects of critical behaviour of magnetic materials are presented and discussed. The scaling ideas are shown to arise in the context of purely magnetic properties as well as in that of thermal properties as demonstrated by magnetocaloric effect or combined scaling of excess entropy and order parameter. Two non-standard approaches to scaling phenomena are described. The presented concepts are exemplified by experimental data gathered on four representatives of molecular magnets.
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