Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 4

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

Search:
in the keywords:  77.65.Bn
help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

The Influence of Alarm Siren Structure Parameters on Output Sound Pressure Level

100%
Wiciak J., Dąbrowski K.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 1A
A-136-A-141
EN
The paper is a discussion of the construction of an alarm siren based on the active piezoelectric element. The influence of various parameters on the loudness of the siren was investigated. Efforts to increase the efficiency of selected design were made. The simulations carried out based on an ANSYS. Individual dimensions of a piezoelectric transducer were selected as well as a collaborate diaphragm. The possibility of using different piezoelectric materials was also analyzed. All tasks and computer simulations were aimed at receiving a siren structure able to obtain the highest sound pressure level at selected frequency.
2
Content available remote

Piezoelectric Effect in Strained CdTe-Based Heterostructures

100%
Cibert J., Andre R., Dang L. S.
Acta Physica Polonica A
|
1995
|
vol. 88
|
issue 4
591-600
EN
Strained III-V or II-VI heterostructures grown along a polar axis in­corporate a piezoelectric field which strongly alters their electronic prop­erties. We review some experimental studies of this built-in field, and its consequences, in CdTe-CdMnTe and CdTe-CdZnTe heterostructures. This includes: (i) the measure of the built-in field, with as an example the depen­dence of the piezoelectric coefficient on bond length; (ii) the description of the exciton formed by an electron and a hole which can be continuously sep­arated in space by the piezoelectric field; (iii) some examples of the extreme sensitivity to any additional electric field.
3
Content available remote

Influence of the sample orientation in Sn2P2S6 crystals on the hydrostatic piezoelectric coefficients

100%
Panoŝ S., Panoŝová D.
Open Physics
|
2003
|
vol. 1
|
issue 1
91-99
EN
The influence of the sample orientation on the effective value of the hydrostatic piezoelectric coefficients dh(i) of Sn2P2S6 crystals has been studied. The hydrostatic piezoelectric coefficients dh(1) and d′h(3), were measured, dh(1)=(244±3) pC/N and d′h(3)=(92±1) pC/N. The hydrostatic piezoelectric coefficient d h(3) for orthogonal axis system was calculated to be dh(3)=(87±2) pC/N. The, optimal orientation of the sample has been found as (Xy l)−20°-cut. Maximal value of the effective hydrostatic piezoelectric coefficient d h(1) equals 260 pC/N. Double rotated samples were also studied. The orientation of the samples insensitive to the pressure has been found. The theoretical mean value of hydrostatic piezoelectric coefficient (d h)mean corresponding to randomly oriented Sn2P2S6 grains in a poled composite has been calculated to be (d h)mean=136 pC/N.
4
Content available remote

Electrical, Electromechanical and Piezoelectric Properties of Ca₃TaGa₃Si₂O₁₄ Resonators at Elevated Temperatures

100%
Suhak Y., Schulz M., Sotnikov A., Schmidt H., Fritze H.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 4
1069-1073
EN
The electrical conductivity, resonance frequency and piezoelectric strain constants are determined for ordered piezoelectric Ca₃TaGa₃Si₂O₁₄ (CTGS) single crystals from room temperature to 900°C. The latter result from three independent methods, namely resonant, ultrasonic pulse-echo, and laser Doppler vibrometry techniques, which allows validating the results. Further, the long-term behaviour of fundamental materials properties including electrical conductivity and resonance frequency are examined at 1000°C for CTGS crystals, grown by different manufacturers. After an initial period of about 500 h, the conductivity is found to remain nearly constant for at least 1500 h. In a period of 2000-5000 h a decrease of conductivity by only 20% is observed. The resonance frequency is found to decrease almost linearly in a period of 500-5000 h for all investigated samples.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.