Autor: Linde, B. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Experimental Methods Necessary in Acoustic Spectroscopy
Autorzy:: Linde, B.
Skrodzka, E.
Tematy:: 43.35.Bf
43.35.Fj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1383730.pdf Link otwiera się w nowym oknie
Opis:: The paper is an overview of a theory and experimental methods used in acoustic spectroscopy. Theoretical discussion about the ultrasonic relaxation process related to energy transfer between translational and vibrational degrees of freedom as well as to the existing of chemical isomerism is presented. Two basic ultrasonic measurements methods of absorption and velocity in very wide frequency range from hundreds kHz to tens GHz are described. Several experimental examples of advantage of the ultrasonic spectroscopy are also shown.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: In Memoriam Professor Czesław Lewa
Autorzy:: Śliwiński, A.
Linde, B.
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177908.pdf Link otwiera się w nowym oknie
Opis:: Professor Czesław Lewa – retired professor of the University of Gdańsk passed away after his long illness on the 9th of August 2016.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of Bass Bar Tension on Modal Parameters of a Violin’s Top Plate
Autorzy:: Skrodzka, E. B.
Linde, B.B.J.
Krupa, A.
Tematy:: violin
modal analysis
bass bar tension; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177670.pdf Link otwiera się w nowym oknie
Opis:: Experimental modal analysis of a violin with three different tensions of a bass bar has been performed. The bass bar tension is the only intentionally introduced modification of the instrument. The aim of the study was to find differences and similarities between top plate modal parameters determined by a bass bar perfectly fitting the shape of the top plate, the bass bar with a tension usually applied by luthiers (normal), and the tension higher than the normal value. In the modal analysis four signature modes are taken into account. Bass bar tension does not change the sequence of mode shapes. Changes in modal damping are insignificant. An increase in bass bar tension causes an increase in modal frequencies A0 and B(1+) and does not change the frequencies of modes CBR and B(1−).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Modal Parameters of Two Violins with Different Varnish Layers and Subjective Evaluation of Their Sound Quality
Autorzy:: Skrodzka, E. B.
Linde, B.B.J.
Krupa, A.
Tematy:: violin
modal analysis
varnish
subjective sound quality evaluation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/176852.pdf Link otwiera się w nowym oknie
Opis:: Two violins were investigated. The only intentionally introduced difference between them was the type of varnish. One of the instruments was covered with a spirit varnish, the other was oil varnished. Experimental modal analysis was done for unvarnished/varnished violins and a questionnaire inquiry on the instrument’s sound quality was performed. The aim of both examinations was to find differences and similarities between the two instruments in the objective (modal parameters) and subjective domain (subjective evaluation of sound quality). In the modal analysis, three strongly radiating signature modes were taken into account. Varnishing did not change the sequence of mode shapes. Modal frequencies A0 and B(1+) were not changed by oil varnishing compared to the unvarnished condition. For the oil varnished instrument, the frequency of mode B(1+) was lower than that of the same mode of the spirit varnished instrument. Our two violins were not excellent instruments, but before varnishing they were practically identical. However, after varnishing it appeared that the oil-varnished violin was better than the spirit-varnished instrument. Therefore, it can be assumed with a fairly high probability that also in general, the oil-varnished violins sound somewhat better than initially identical spirit-varnished ones.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Modal Analysis of a Trapezoidal Violin Built after the Description of Félix Savart
Autorzy:: Duerinck, T.
Skrodzka, E.
Linde, B.B.J.
Tematy:: trapezoidal violin
modal analysis
mode shapes; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177176.pdf Link otwiera się w nowym oknie
Opis:: One-dimensional experimental modal analysis of an unvarnished trapezoidal violin built after the description of F. Savart and an anonymous trapezoidal violin on display in the Music Instrument Museum of Brussels is described. The analysis has revealed ten prominent modes. A mode that may potentially play a role of the “tonal barometer” of the instrument is pointed out. The mode shapes are symmetric and of high amplitude, due to the construction of the instrument. Subjective evaluation of the sound quality demonstrated no pronounced difference between the trapezoidal violin and normal violin.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Characterization of Temperature Field Distribution in Large-Size Paratellurite Crystals Applied in Acousto-Optic Devices
Autorzy:: Tretiakov, S.
Grechishkin, R.
Kolesnikov, A.
Kaplunov, I.
Yushkov, K.
Molchanov, V.
Linde, B.
Tematy:: 42.70.-a
42.79.-e
65.40.-b
07.20.-n; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1383374.pdf Link otwiera się w nowym oknie
Opis:: Temporal and spatial distribution of temperature field was studied in operating acousto-optic devices on base of large-size paratellurite crystals. The study was carried out in real time by means of thermal imaging technique. Dynamics of heat release in a hot deflector and a hot tunable filter was examined at different frequencies and driving electric power levels applied to piezoelectric transducers. The study was also based on measurements of standing wave ratio and analysis of the Smith charts.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A Study of Optical Uniformity of Lithium Niobate and Paratellurite Crystals by the Method of Conoscopy
Autorzy:: Kolesnikov, A.
Tretiakov, S.
Grechishkin, R.
Morozova, K.
Yushkov, K.
Molchanov, V.
Linde, B.
Tematy:: 42.79.Jq
65.40.-b; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1383456.pdf Link otwiera się w nowym oknie
Opis:: An exact equation of the isochromatic fringes of uniaxial crystals derived without usually adopted simplifications is presented. It enables to calculate the optical conoscopic figures for ideal crystals with different angular orientations of the optical axis with respect to the normal to the crystal surface. Conoscopic figures of large-size single crystals of lithium niobate and paratellurite were examined experimentally making use of a laser-based setup. The conoscopic figure evolution in operating acousto-optic devices was studied.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Detection of wavy sea surface oil-derivative contamination with forward specular high-frequency scattering
Autorzy:: Pogorzelski, Stanisław
Rochowski, Paweł
Grzegorczyk, Maciej
Linde, Bogumił B. J.
Skrodzka, Ewa
Bielasiewicz, Łukasz
Tematy:: crude oil contamination
capillary wave damping
acoustic surface scattering
statistical-frequency analyses
at-sea pollution detection; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/260616.pdf Link otwiera się w nowym oknie
Opis:: A spectrum of low-frequency (20‒30 Hz) amplitude fluctuations of the ultrasonic (10 MHz) signal specularly scattered from water surfaces covered with monomolecular and thicker crude oil origin films of well-defined, oceanographically relevant viscoelastic properties was examined in laboratory and at-sea conditions. The relationship between the Surface water wave (30 Hz) damping coefficient and the oil layer thickness was established, and compared to the one predicted by the classical Stokes theory. The depression of the spectral energy density of wind-driven waves by surface films was inferred from the ratio of acoustic signal fluctuations spectra with/without films, and compared to that resulting from the Marangoni damping theory applicable to monolayers of particular surface viscoelasticity. The agreement between the theory and experimental data was satisfactory. As shown in at-sea experiments performed with a free-floating, buoy-like acoustic system, and an artificial oil slick spread over the Baltic Sea surface, the film’s rheological Surface properties can be recovered from acoustic surface probing, as well as oil spill edge detection. Simultaneous statistical analyses of the scattered signal amplitude distribution parameters turned out to be unequivocally related to the oil substance fraction weight, oil layer thickness, and the form of oil contamination.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Photoacoustic Method as a Tool for Analysis of Concentration-Dependent Thermal Effusivity in a Mixture of Methyl Alcohol and Water
Autorzy:: Ponikwicki, Nikodem
Szczepanik, Łukasz
Gondek, Joanna
Linde, Bogumił B.J.
Skrodzka, Ewa Barbara
Molchanov, Vladimir
Yushkov, Konstantin B.
Grechishkin, Rostislav
Tematy:: thermal effusivity
aqueous solutions
methanol
photoacoustic technique; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/177617.pdf Link otwiera się w nowym oknie
Opis:: It has been shown in the present paper that exploitation of the experimental potential of a photoacoustic technique can provide information on a type of intermolecular interactions in aqueous mixtures containing organic liquids, when the basic parameters of these mixtures, such as density, ρ, specific heat, c_p, or thermal conductivity, λ, are unknown. Earlier investigations of concentration dependence of effusivity in different aqueous solutions of organic liquids demonstrated that the photoacoustics method is a sensitive tool to identify hydrophobic properties of such liquids. In our experiment this suggestion was exploited for a solution of methanol which is known to display much weaker hydrophobicity than other alcohols. It was confirmed that the location of extreme deviations from linearity for the thermal effusivity, Δe, agrees well with that of characteristic points for the isentropic compressibility coefficient, κ_S, and the excess molar volume, V^E_m , as a function of the concentration.
Dostawca treści:: Biblioteka Nauki

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