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Wyświetlanie 1-15 z 28
Tytuł:
Absorption and Dispersion of Ultrasonic Waves in n-Amylic Alcohol-Nitromethane Critical Mixture
Autorzy:
Hornowski, T.
Łabowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1887536.pdf
Data publikacji:
1991-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.+d
Opis:
Measurement of absorption and propagation velocity of ultrasonic waves as well as shear viscosity in n-amylic alcohol-nitromethane critical mixture are reported. Acoustic measurements were performed in the frequency range from 5 to 25 MHz and temperatures ΔT = T - T$\text{}_{c}$ from 0.1 to 12.3 K. An analysis of the results was carried out on the basis of a modified version of mode-coupling theory [10], which led to good agreement with experiment. The correlation length ξ$\text{}_{0}$ = 0.94 Ǻ is in agreement with the value obtained from optical measurements.
Źródło:
Acta Physica Polonica A; 1991, 79, 5; 671-682
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Modes Transformation upon Reflection in Tellurium Dioxide Crystal
Autorzy:
Polikarpova, N.
Voloshinov, V.
Powiązania:
https://bibliotekanauki.pl/articles/1383533.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Hp
42.79.Jq
43.35.Sx
43.35.+d
Opis:
Generation of acoustic shear waves in crystals is one of the main problem of acousto-optics. Launching of the shear waves is much more difficult than the longitudinal modes because of difficulties related to acoustic contact and also because of problems arising from matching of acoustic and electric parameters of piezoelectric transducer. We obtained the transverse waves as a result of longitudinal-shear modes reflection in a crystal. Crystals having the required effect should possess a strong anisotropy of their elastic properties to realize the effective acoustic mode transformation. In this paper, one of the important cases of the acoustic waves reflection is investigated theoretically and experimentally. The research was carried out in the crystal of paratellurite.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 96-98
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Wave Propagation in Mercury in Constant External Magnetic Field
Autorzy:
Skumiel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1928266.pdf
Data publikacji:
1993-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.+d
Opis:
The paper gives a theoretical analysis of the effect of an external constant magnetic field on the propagation of ultrasonic waves in electrically conducting liquids as well as the results of measurements carried out in mercury. The theoretical part is based on Euler's equation, the equation of continuity, the thermodynamical equation, and Maxwell,s equations. In the experimental part we propose and apply two methods for the measurement of the ultrasonic propagation velocity and its variations, as well as a pulse method perfected by the use of analog memory for the determination of the amplitude absorption coefficient. The correctness of the theoretical basis underlying the calculation of the small changes in propagation velocity induced by the magnetic field is confirmed by experiment. The amplitude absorption coefficient determined experimentally is considerably greater than that calculated theoretically for the medium studied.
Źródło:
Acta Physica Polonica A; 1993, 83, 2; 173-185
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dependence of Ultrasonic and Magnetic Hyperthermia on the Concentration of Magnetic Nanoparticles
Autorzy:
Kaczmarek, K.
Hornowski, T.
Bielas, R.
Żak, D.
Timko, M.
Józefczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030383.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.-c
43.35.Cg
43.35.Wa
87.85.-d
Opis:
Hyperthermia treatment is the heating of tumor tissue up to temperatures between 41°C and 45°C, which trigger several physiological reactions in the body. Hyperthermia within tissue can be applied through various mechanisms. One of them is magnetic hyperthermia which uses superparamagnetic iron oxide nanoparticles (SPIONs) heated by an externally applied magnetic field. SPIONs can also be used as sonosensitizers in ultrasound hyperthermia increasing acoustic wave attenuation. The impact of SPION concentration on thermal effect during ultrasonic and magnetic hyperthermia was investigated in agar-gel phantom with added magnetite nanoparticles. The presence of nanoparticles in the tissue-mimicking phantom increases the thermal losses of ultrasound energy and temperature of the phantom.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 716-718
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Temperature on Non-Destructive Wave Propagation in Uranium Monopnictides
Autorzy:
Singh, R.
Singh, M.
Chaurasia, S.
Powiązania:
https://bibliotekanauki.pl/articles/1808103.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.Cg
62.20.de
62.20.D-
Opis:
Acoustic attenuation due to phonon-phonon interaction, thermoelastic mechanism and dislocation damping were evaluated in uranium monopnictides (viz. UN, UAs and USb) in the temperature range 50-500 K, along the three crystallographic directions of propagation, viz. [100], [110] and [111] for longitudinal and shear modes of propagation. Due to antiferromagnetic property of these compounds ultrasonic attenuation due to magnon-phonon interaction was also obtained. The second- and third-order elastic moduli of B1-type uranium monopnictides were obtained using electrostatic and the Born repulsive potentials. Gruneisen numbers and acoustic coupling constants were evaluated for longitudinal and shear waves along different directions of propagation and polarization. Results were discussed and compared with available data. It was found that the temperature dependence of attenuation due to phonon-phonon interaction and thermoelastic loss mechanisms follow the third and fourth order polynomial fit laws, respectively, and acoustic attenuation is mainly governed by phonon-phonon interaction in this temperature range.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 664-670
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency Measurements of Ultrasonic Generator for Welding
Autorzy:
Kardyś, W.
Milewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1401919.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Vj
43.35.-c
43.35.+d
77.65.Dq
77.84.Cg
85.50.-n
Opis:
The paper presents results of theoretical analysis as well as practical measurements of efficiency in ultrasonic welding system with main focus on ultrasonic generator. Through analysis and tests were performed using 3 kW 20 kHz Sonic Blaster ultrasonic generator manufactured by ITR. Special equipment was used to perform accurate measurements of input and output power of such generator since an output signal of the ultrasonic generator has high voltage amplitude up to 3 kV and frequency of 20 kHz. Artificial load able to dissipate up to 6 kW of continuous power was designed to simulate ultrasonic transducer. Power measurements were performed on the mains supply of the generator using accurate true RMS power meter and load side measurements were performed using specially built power metering system able to measure high voltage 20 kHz signals based on calibrated high voltage resistive divider and high frequency current transducer.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 456-460
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Performance of Electroacoustic Piezoelectric Ceramic Transducers
Autorzy:
Abd El-Ati, M. I.
Mosaad, M. M.
El-Baradie, B.Y.
Powiązania:
https://bibliotekanauki.pl/articles/1920644.pdf
Data publikacji:
1992-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.+d
77.60.+v
Opis:
Lead zirconate-titanate containing 1 wt % niobium with different Zr/Ti ratios compositions were studied. A pronounced increase in densification during sintering process occurred near tetragonal-rhombohedral phase. Dielectric constant of polarized and unpolarized samples was studied. The rotation of all 90° domains to their original positions caused the more looseness of Ti$\text{}^{4+}$ and Zr$\text{}^{4+}$ in the octahedral configuration leading to greater polarization in the tetragonal structure, thus leading to, higher dielectric constant. Near the phase change, the minimum resonance frequency caused the minimum values of ultrasonic waves, which were emitted from the edge of the polarized ceramic transducers.
Źródło:
Acta Physica Polonica A; 1992, 81, 4-5; 527-533
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydration of the Zwitterionic Forms οf Amino Acids from the Acoustic Passynski Method
Autorzy:
Burakowski, A.
Gliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811531.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.Bf
43.35.+d
61.20.-p
61.20.Qg
Opis:
In this communication, we report the compressibility measurements made on amino acids in water at 25°C, compared with aqueous short-chained amines and carboxylic acids. The effect of the charge caused by protonation of the amino group and/or deprotonation of the carboxylic one was tested. The concept of additivity of the hydration number with the constituents of solute molecule was applied and discussed.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-39-A-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Refractive Indices Dispersion on Parameters of Imaging AOTFs Operating with Non-Polarized Light
Autorzy:
Yukhnevich, T. V.
Voloshinov, V. B.
Pritulenko, I. G.
Powiązania:
https://bibliotekanauki.pl/articles/2048161.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Fx
42.25.Ja
42.25.Lc
42.30.Va
42.79.Jq
43.38.+n
43.35.+d
Opis:
The paper presents results on investigation of paratellurite based imaging tunable acousto-optic filters operating with arbitrary polarized light. We analyzed influence of dispersion of refractive indices in the crystal on a simultaneous satisfaction of the Bragg matching condition for ordinary and extraordinary polarized optical beams. The analysis was carried out at different optical wavelengths over the wide tuning range of the filters 400-1150 nm. Theoretical and experimental analysis of the problem proves that in a paratellurite tunable acousto-optic filter, the Bragg matching angle common for the two optical polarizations is varying in the limits up to 0.3°. This variation of the incidence angle may be as wide as a quarter of the filter angular aperture thus proving that the examined phenomenon should be considered in design of the imaging tunable acousto-optic filters.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 78-80
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of a GaN-Based SAW Oscillator with respect to UV Illumination and Temperature
Autorzy:
Miškinis, R.
Jokubauskis, D.
Urba, E.
Smirnov, D.
Gaidamovičiūtė, L.
Mikalauskas, K.
Sereika, A.
Rimeika, R.
Čiplys, D.
Powiązania:
https://bibliotekanauki.pl/articles/1383507.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.+d
Opis:
Oscillation frequency of a GaN-based surface acoustic wave delay-line oscillator is investigated in the temperature range from -20°C to +38°C, with and without UV illumination. The results imply that such an oscillator may be used for temperature sensing with the resolution of up to 1 mK. On the other hand, as the frequency downshift due to UV illumination does not exhibit a significant dependence on temperature, it may be expected that such a system, when used as a UV sensor, would not require applying a correction for temperature.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 90-92
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Adiabatic Compressibility and Ultrasonic Relaxation in Aqueous Solutions of N, N-Diisopropylacetamide and Zinc Acetate
Autorzy:
Miecznik, P.
Powiązania:
https://bibliotekanauki.pl/articles/1931802.pdf
Data publikacji:
1994-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.+d
Opis:
Measurements of velocity at frequency of 1 MHz and absorption coefficient of ultrasonic waves within the range 3-50 MHz in aqueous solutions of N,N-diisopropylacetamide (D-i-PA) and zinc acetate ((CH3$\text{}_{C}$OO)$\text{}_{2}$Zn) were made. Additionally, the density of the solutions was measured. The adopted method for making the solutions helped to change the ratio of the number of non-electrolyte molecules to that of electrolyte molecules, with a constant number of water molecules. Measurements of the velocity of ultrasonic waves in the solutions under study were conducted by means of an impulse-phase interferometer. Measurements of the absorption coefficient of ultrasonic waves were conducted by means of an ultrasonic high frequency system, type Matec Instruments (USA) Model 7700. All the measurements were conducted at a constant temperature of 20°C. On the basis of the analysis of excess functions of the molar volume and the adiabatic compressibility, the formation of solvatomers composed of [(D-i-PA)$\text{}_{2}$Zn(H$\text{}_{2}$O)$\text{}_{2}$]$\text{}^{2+}$ and [(D-i-PA)Zn(H$\text{}_{2}$O)$\text{}_{3}$]$\text{}^{2+}$ was found. Also the complex [Zn(CH$\text{}_{3}$COO)$\text{}_{4}$]$\text{}^{2-}$ can be recognised. The results of measurements of sound absorption indicate the occurrence of the relaxation process in the solutions under study and the frequency range used. On the basis of the relaxation theory, relaxation parameters of the process under study were calculated. The relaxation processes discovered in the system (D-i-PA)-H$\text{}_{2}$O(CH$\text{}_{3}$COO)$\text{}_{2}$Zn were assigned to the formation and disintegration of solvatomers composed of [(D-i-PA)Zn(H$\text{}_{2}$O)$\text{}_{3}$]$\text{}^{2+}$ and probably complexes mentioned before.
Źródło:
Acta Physica Polonica A; 1994, 86, 6; 895-906
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement System for Parameter Estimation and Diagnostic of Ultrasonic Transducers
Autorzy:
Kluk, P.
Milewski, A.
Kardyś, W.
Kogut, P.
Michalski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1399367.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.-c
43.35.+d
43.38.+n
43.38.-p
84.37.+q
07.10.-h
46.40.-f
07.20.Dt
Opis:
The paper presents an architecture and design of measurement system and methods for parameter estimation and diagnostic of ultrasonic transducers used in ultrasonic welding and cutting systems manufactured by Tele and Radio Research Institute. The key element of the ultrasonic welding and cutting system is a high power ultrasonic transducer implemented as a sandwich transducer consisting of a stack of piezoelectric ceramic rings mounted between two masses. High quality welding and cutting demand predetermined frequency characteristic of transducer impedance. Also important are: high energy efficiency, high coupling coefficient, low dielectric loss, and the optimal radiation pattern. In order to manufacture high quality and long-life transducers the piezoelectric rings must be selected and the sandwich transducers diagnosed on the basis of their measured parameters. Presented measurement system takes advantage of the virtual instrument technique in the NI LabVIEW environment. It uses Agilent U2761A Function Generator, U2531A Data Acquisition Unit, and the linear amplifier to measure impedance frequency characteristic in the frequency range of 10 kHz to 100 kHz. Moreover, the system can measure the vibration amplitude in the range of 1 μm up to 100 μm, using an optical sensor, and the temperature of the transducer using a pyrometer sensor.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 468-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Interaction Study of Binary Mixtures of THF with Methanol and o-Cresol - an Optical and Ultrasonic Study
Autorzy:
Parveen, S.
Singh, S.
Shukla, D.
Singh, K.
Gupta, M.
Shukla, J.
Powiązania:
https://bibliotekanauki.pl/articles/1585019.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.+d
62.60.+v
82.60.Lf
Opis:
The refractive indices, densities and ultrasonic velocities of binary liquid mixtures of tetrahydrofuran (THF) with methanol and o-cresol over the entire composition range have been measured at 293, 303 and 313 K. Refractive index, density and ultrasonic velocity data have been used to evaluate the molar refraction deviation $ΔR_{m}$, deviation in ultrasonic velocity Δu, excess internal pressure $π_{i}^{E}$, excess molar enthalpy $H_{m}^{E}$ and excess free volume $V_{f}^{E}$. The computed results of $ΔR_{m}$, Δu, $π_{i}^{E}$, $H_{m}^{E}$ and $V_{f}^{E}$ were fitted to the Redlich-Kister polynomial equation. These results suggest that specific strong interactions are taking place in THF + o-cresol mixture while dispersive forces seem to be responsible for behaviour of THF + methanol mixture. Further, experimental refractive index and density data of these mixtures were also used to test the validity of the empirical/semi-empirical relations and models for refractive index and density, respectively.
Źródło:
Acta Physica Polonica A; 2009, 116, 6; 1011-1017
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Acousto-Optic Regime of Interaction in Media Possessing Strong Elastic Anisotropy
Autorzy:
Voloshinov, V.
Djakonov, E.
Polikarpova, N.
Powiązania:
https://bibliotekanauki.pl/articles/1383161.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Hp
42.79.Jq
43.35.Sx
43.35.+d
Opis:
We present results on theoretical and first experimental investigation of a new regime of acousto-optic interaction existing in acoustically anisotropic medium. We defined the new regime as "semi-collinear" or "mixed interaction" since it combined properties of the traditional non-collinear diffraction and the pure collinear interaction. The peculiar phenomenon was registered in the tellurium dioxide crystal due to the extremely strong elastic anisotropy of the material. Application of a specific cut of the crystal provided observation of the effect in the middle infrared at the optical wavelength 3.39 μm and at the acoustic frequencies limited to 300 MHz. The observed interaction was characterized by a non-collinear propagation of incident light with respect to acoustic energy flow and simultaneously a collinear propagation of diffracted radiation along the acoustic energy flow. A brief theoretical analysis of the interaction based on wave vector diagrams and two-dimensional coupled wave equations is included in the presentation. Finally, we describe in the paper, the setup and basic details of the carried out acousto-optic experiment.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 36-42
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Method to Calculate Spatial Distribution of Acousto-Optic Figure of Merit in Crystals
Autorzy:
Muromets, A.
Trushin, A.
Powiązania:
https://bibliotekanauki.pl/articles/1383519.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.hb
42.79.Jq
43.35.Cg
62.30.+d
46.15.-x
78.20.Bh
Opis:
We propose a novel method to calculate acousto-optic figure of merit in crystals. Calculations are performed in laboratory coordinate system where Z'-axis is collinear with wave vector of ultrasound and the Fresnel equation is considered as an equation on the third component of refractive index vector. The method is applicable to both uniaxial and biaxial crystals. In this paper, we compared obtained values of acousto-optic figure of merit with values from literature data for uniaxial crystals such as paratellurite, lithium niobate, tellurium and for biaxial crystals such as lead and strontium tetraborates. Calculations in paratellurite were carried out for slow-shear acoustic wave propagating along [110] crystal axis. In lithium niobate crystal, we perform comparison with results for geometry of acousto-optic interaction where acoustic wave vector forms 88° angle with X crystal axis and 150.4° angle with Z crystal axis. In tellurium crystal, we investigate geometries applied in infrared deflectors. In $SrB_4O_7$ and $PbB_4O_7$ crystals we analyze acousto-optic characteristics of slow-shear mode propagating along [100] crystal axis. Spatial distributions of acousto-optic figure of merit and acoustic frequency for the mentioned acousto-optic interaction geometries are presented.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 93-95
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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