Wszystkie pola: 43.25.Fe - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Transversely Inhomogeneous Nonlinear Surface Ultrasonic Monopulses in Solid Film-Substrate System
Autorzy:: Tecpoyotl-Torres, M.
Vera-Dimas, G.
Grimalsky, V.
Koshevaya, S.
Powiązania:: https://bibliotekanauki.pl/articles/1364175.pdf
Data publikacji:: 2014-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.25.Fe
42.65.Tg
62.50.Ef
Opis:: Excitation of nonlinear acoustic monopulses, or baseband waves, is theoretically analyzed. The monopulses have a wide spectrum up till the gigahertz range ≤ 1 GHz. The propagation of waves is along the interface between a solid film and a solid substrate. A quadratic elastic nonlinearity in both contacting media of the system is taken into account. The nonlinear dynamics of waves depends essentially on the thickness of the film. The transverse inhomogeneity of the wave profile in the interface plane and the wave diffraction are taken into account, too. The baseband waves are not true solitons and manifest as single shock-like pulses in the case of an excitation from initial long rectangular pulses. The transverse inhomogeneity affects the dynamics of the shocks, and there is a possibility to focus the nonlinear monopulses.
Źródło:: Acta Physica Polonica A; 2014, 125, 5; 1118-1125
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Surface Acoustic Wave Vibration Sensors for Linear Electronic Warning Systems
Autorzy:: Filipiak, J.
Solarz, L.
Steczko, G.
Powiązania:: https://bibliotekanauki.pl/articles/1795794.pdf
Data publikacji:: 2009-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.25.Fe
77.65.Dq
43.35.Pt
68.35.Iv
Opis:: The topic of the paper is analysis of feasibility of surface acoustic wave vibration sensors for linear electronic warning systems. In linear warning systems localisation of the object is realised by pointing out the sensors which detect vibrations caused by the object. The information sent out by the detector enables identification of the sensor and its state. The sensor contains surface acoustic wave delay line in four-terminal network. The delay line is formed at the surface of piezoelectric plate. The vibrations of the plate are caused by vibrations of the medium surrounding the sensor. The frequency of the input signal is equal to the working frequency of delay line. The phase of the output signal is shifted in comparison with the input signal. The frequency of the phase shift would be equal to the resonance frequency of the sensor plate. The change of the output signal amplitude would be proportional to the amplitude of plate vibrations. The measured amplitude and frequency of the output signal would be registered by simple electronic devices. The measurements give us knowledge which sensor vibrates and the intensity of these vibrations. Such sensors enable construction of the electronic warning system.
Źródło:: Acta Physica Polonica A; 2009, 116, 3; 302-306
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Surface Acoustic Wave Vibration Sensor Electronic System
Autorzy:: Filipiak, J.
Solarz, L.
Steczko, G.
Powiązania:: https://bibliotekanauki.pl/articles/1493039.pdf
Data publikacji:: 2011-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.25.Fe
77.65.Dq
68.35.Iv
Opis:: The paper presents surface acoustic wave vibration sensor electronic system. The system cooperates with surface acoustic wave delay line. The sensor has been designed for electronic warning systems. The sensor is a four-terminal network. In the system, there is a cascade connection of sensors by means of coaxial cable. Test signal and constant supply voltage are jointly sent between sensors. Separating the signals, their summation and amplification of test signal as well as matching the line to impedance 50 Ω are performed by surface acoustic wave vibration sensor electronic system. The electronic system devices and the making of them are discussed. System development of such a sensor is presented and its design is analysed. Experimental examination results of surface acoustic wave vibration sensor are presented. Parasitic effects occurring in vibration sensor electronic system operation connected with electromagnetic coupling and ground current coupling are discussed.
Źródło:: Acta Physica Polonica A; 2011, 120, 4; 598-603
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Study of the Effect of Boron Concentration on Magnetic and Structural Properties of $Nd_{7.5}Pr_{2.5}Fe_{90-x}B_x$ Melt-Spun Alloys
Autorzy:: Siddique, M.
Ahmad, I.
Kanwal, M.
Ahmed, E.
Powiązania:: https://bibliotekanauki.pl/articles/1401887.pdf
Data publikacji:: 2015-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.80.+y
75.50.-y
61.43.-j
61.05.C-
Opis:: The Mössbauer spectroscopy and X-ray diffraction techniques have been used to investigate the effect of boron concentration on the structural and magnetic properties of as-quenched and heat-treated melt-spun alloys $Nd_{7.5}Pr_{2.5}Fe_{90-x}B_x$ (x=6, 8, 10) produced by melt-spinning technique. X-ray diffraction and Mössbauer spectroscopy results indicate that as-prepared samples are completely amorphous in nature. The X-ray diffraction patterns of samples heat-treated at 700°C are indexed as $Fe_{3}B,$ $\alpha-Fe,$ $(NdPr)_{2}Fe_{14}B$ and $Fe_{23}B_{6}$ phases. The Mössbauer spectra of heat-treated samples are very complex and constituted a number of sextets and a quadrupole doublet. Two main phases are $(NdPr)_{2}Fe_{14}B$ hard and $t-Fe_{3}B$ soft magnetic phases while $\alpha-Fe$ and $Nd_{23}Fe_{6}$ are detected as minor phases. The average internal magnetic field decreases with the increase of boron content; more sharply in as-prepared and comparatively slowly in heat-treated samples. The X-ray diffraction and Mössbauer spectroscopy results are in good agreement with each other.
Źródło:: Acta Physica Polonica A; 2015, 128, 3; 353-357
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: SAW Delay Line for Vibration Sensors
Autorzy:: Filipiak, J.
Solarz, L.
Steczko, G.
Powiązania:: https://bibliotekanauki.pl/articles/1417951.pdf
Data publikacji:: 2012-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.25.Fe
77.65.Dq
68.35.Iv
Opis:: The paper presents an analysis of surface acoustic wave delay line. The line consists of two simple interdigital transducers placed on a ST-cut quartz plate. Mid-band operation frequency of the line is 74 MHz. The line will be applied for surface acoustic wave vibration sensor. At the immovable end of the plate there are electric signal feeds to both transducers. This is the cause of increase in signal value going directly between the transducers and the cause of line losses. By means of equivalent electric model of interdigital transducer a loss analysis of the line has been made at 50 Ω load. The analysis allows to minimize line losses by matching the transducers to 50 Ω impedance. This has been practically achieved by a design of transducer geometry and configuration matching 50 Ω impedance, by means of inductance. An analysis of repeated operation characteristics of two interdigital transducers has been made. A signal going directly through capacitance between transducers and signals reflected from the edge of piezoelectric substrate have been presented. Results of theoretical analysis have been compared with experimental examinations.
Źródło:: Acta Physica Polonica A; 2012, 122, 5; 808-813
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Photothermal Investigation of Cavitation Wear Protecting NiTi-Coatings
Autorzy:: Gibkes, J.
Bein, B.
Pelzl, J.
Wieck, A.
Glokowski, Th.
Pohl, M.
Delgadillo-Holtfort, I.
Chirtoc, M.
Powiązania:: https://bibliotekanauki.pl/articles/1811521.pdf
Data publikacji:: 2008-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 62.20.Fe
43.25.Yw
78.20.Nv
Opis:: Photothermal radiometry was applied to investigate the effect of abrasion by cavitation on steel which was supplied with a wear protecting NiTi film. Phase and amplitude data from areas on the sample which where damaged differently by the cavitation effect indicate the appearance of a three layer structure with the cavitation treatment. With cavitational impact the thermal diffusion time of the first layer decreases and an interfacial layer emerges which is identified as a surface region of the steel substrate which has undergone a stress induced transformation from an austenite to a martensite structure.
Źródło:: Acta Physica Polonica A; 2008, 114, 6A; A-103-A-107
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical Optimization of Structures SAW Gas Sensors
Autorzy:: Hejczyk, T.
Urbańczyk, M.
Powiązania:: https://bibliotekanauki.pl/articles/1399352.pdf
Data publikacji:: 2013-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.25.Fe
77.65.Dq
68.35.Iv
07.07.Df
Opis:: This paper presents the results of the analysis of surface acoustic waves sensor equivalent model. They were the sensor response of the surface acoustic waves sensor in the steady state gas: $H_2$, $CO_2$, $NO_2$, $NH_3$, $C_nH_m$, $CO$. Thin layer of $WO_3$ has been used as a sensor layer. Impedance replacement of sensor layer, taking into account the profile of the concentration of gas molecules in the layer, has been implemented into the equation of Ingebrigtsen, which enabled us to obtain analytical expressions for the relative changes in surface wave velocity in the steady state. The results of the analysis show that there is an optimum thickness of layer sensor for which an acoustoelectric effect (change in the acoustic wave velocity) is the highest.
Źródło:: Acta Physica Polonica A; 2013, 124, 3; 432-435
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Influence of 1% Addition of Nb and W on the Relaxation Process in Classical Fe-Based Amorphous Alloys
Autorzy:: Pietrusiewicz, P.
Błoch, K.
Nabiałek, M.
Walters, S.
Powiązania:: https://bibliotekanauki.pl/articles/1385746.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.60.Lr
75.50.-y
75.50.Kj
75.30.Cr
61.43.Dq
76.80.+y
61.05.Qr
75.25.-j
Opis:: This paper features investigations into the influence of small additions of alloying elements on: structure, as well as the temporal and thermal stability of magnetic properties, and the disaccommodation effect, for the following amorphous alloys: Fe₆₁Co₁₀Y₈Me₁B₂₀ (where Me = Nb, W). The structure of the investigated samples has been confirmed by the Mössbauer spectroscopy. The obtained results indicate a strong correlation between the structure and the disaccommodation of the studied alloys. The Mössbauer studies reveal different configurations of atoms in the amorphous alloy samples, and the results indicate various potential barriers between orientations of atom pairs. For this reason, to describe the disaccommodation effect, the distribution of activation energy should be taken into account. The distribution of activation energy has been related to the distribution of relaxation times.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 397-399
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Fragmentation of Co-Fe-Ta-B Soft Magnetic Amorphous Alloy
Autorzy:: Miškuf, J.
Csach, K.
Juríková, A.
Huráková, M.
Tabachnikova, E.
Powiązania:: https://bibliotekanauki.pl/articles/1387048.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.43.Dq
62.25.Mn
Opis:: The main limitation of high-strength Co-based bulk metallic glasses for their application as structural materials is the large brittleness. Spontaneously emerging cracks in the alloy degrade the magnetic properties. We analyzed the failure characteristics of $Co_{43}Fe_{20}Ta_{5.5}B_{31.5}$ bulk soft magnetic metallic glass deformed in the compression at room temperature and the low strain rate. Under loading the amorphous structure stores high elastic energy. During the failure this energy is released and the alloy breaks into small particles or powder exhibiting a fragmentation mode.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 558-560
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Failure Behaviour of Fe- and Co-Based Amorphous Soft Magnetic Ribbons
Autorzy:: Miškuf, J.
Csach, K.
Juríková, A.
Janák, G.
Švec, T.
Konč, M.
Powiązania:: https://bibliotekanauki.pl/articles/1813535.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.43.Dq
62.25.Mn
Opis:: Fractographic analysis of Co- and Fe-based high strength soft magnetic materials showed the high localization of the plastic deformation and the ductility in narrow shear bands. The estimated fracture toughness of these materials is closely associated with the scale of the local plastic zone.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 95-98
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Bilayer Structures of $NiO_{x}$ and Pd in Surface Acoustic Wave and Electrical Gas Sensor Systems
Autorzy:: Jakubik, W.
Urbańczyk, M.
Maciak, E.
Pustelny, T.
Powiązania:: https://bibliotekanauki.pl/articles/1795797.pdf
Data publikacji:: 2009-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.25.Fe
77.65.Dq
43.35.Pt
68.35.Iv
07.07.Df
Opis:: A bilayer sensor structure of nickel oxide $NiO_x$ ( ≈ 60 nm) with a very thin film of palladium (Pd ≈ 18 nm) on the top, has been studied for gas-sensing application at relatively low temperatures of about 30°C and 60°C. The bilayer structure was obtained by rf sputtering and by vacuum deposition (first the $NiO_{x}$ and then the Pd film) onto a $LiNbO_{3}$ Y-cut Z-propagating substrate, making use of the surface acoustic wave method, and additionally (in the same technological processes) onto a glass substrate with a planar microelectrode array for simultaneous monitoring of the planar resistance of the layered structure. Such a bilayer structure was investigated in a low concentration range (from 50 ppm to 400 ppm in air) of nitrogen dioxide $(NO_{2})$, carbon monoxide (CO) and ammonia $(NH_{3})$ in a dry and wet air atmosphere and in a medium hydrogen concentration (1-2.5%) in dry air. The $NiO_{x}$ and Pd bilayer structure interact rather weakly with $NO_{2}$ molecules but with CO and $NH_{3}$ this interaction is much greater, especially at higher temperature ( ≈ 60°C). The hydrogen sensitivity is on the medium level, not exceeding 600 Hz (relative change in the differential frequency of ≈ 2.3%) at interaction temperature of 35°C.
Źródło:: Acta Physica Polonica A; 2009, 116, 3; 315-320
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Analysis of Non-Steady Stage in SAW Gas Sensors with Semiconducting Sensor Layers
Autorzy:: Urbańczyk, M.
Hejczyk, T.
Powiązania:: https://bibliotekanauki.pl/articles/1493326.pdf
Data publikacji:: 2011-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 07.07.Df
43.25.Fe
68.35.Iv
77.65.Dq
Opis:: The profile of the gas concentration in the sensor layer can be expressed as a polynomial function involving the diffusion coefficient $(D_{K})$, semiconductor film thickness (h), rate constant (k), gas concentration outside the semiconductor film $(C_{S})$. Before reaching a steady state of the concentration profile, its behavior depends on a few factors as the distance from the piezoelectric surface, the rate constant, the thickness of the layer and the diffusion constant and time. We are going to simulate temporary processes in the semiconductor sensor film in the surface acoustic wave gas sensor system and to describe the influence on relative changes of the surface acoustic wave velocity. The numerical results basing on the code written in Pyton, are described and analyzed.
Źródło:: Acta Physica Polonica A; 2011, 120, 4; 789-793
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: $WO_3-Pd$ Structure in SAW Sensor for Hydrogen Detection
Autorzy:: Hejczyk, T.
Urbańczyk, M.
Powiązania:: https://bibliotekanauki.pl/articles/1493196.pdf
Data publikacji:: 2011-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.25.Fe
77.65.Dq
68.35.Iv
07.07.Df
Opis:: In the paper a new sensor structure for surface acoustic wave gas system is presented. A bilayer structure $WO_3-Pd$ thin films may be useful for hydrogen detection in low concentration in air. A bilayer sensor structure of tungsten oxide $WO_3$ with a very thin catalytic film of palladium on the top has been studied for gas-sensing application at room temperature (about 25°C) in surface acoustic wave system. The bilayer structure of $WO_3$ layers with a thickness of about 50 nm, 100 nm and 150 nm was made onto a $LiNbO_3$ Y-cut Z-propagating substrate by means of the vacuum sublimation method using a special aluminum mask. The vapor source consisted of commercially available $WO_3$ powder (Fluka 99.9%) and molybdenum heater. The thin palladium (Pd) layer (about 10 nm) was made separately on each $WO_3$ layer by means of vapor deposition in high vacuum. There have been investigated three structures: 50 nm $WO_3$ + 10 nm Pd, 100 nm $WO_3$ + 10 nm Pd and 150 nm $WO_3$ + 10 nm Pd in three canal surface acoustic wave system with reference oscillator. Numerical results obtained by analysis of the surface acoustic wave gas sensor model have been compared with experimental results.
Źródło:: Acta Physica Polonica A; 2011, 120, 4; 616-620
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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