CO OZNACZA SŁOWO PYROELECTRICITY
Pyroelectricity
Pyroelectricity to zdolność niektórych materiałów do generowania tymczasowego napięcia, gdy są ogrzewane lub chłodzone. Zmiana temperatury zmienia położenie atomów nieco wewnątrz struktury krystalicznej, tak że polaryzacja materiału ulega zmianie. Ta zmiana polaryzacji powoduje napięcie w całym krysztale. Jeśli temperatura będzie utrzymywać się na stałej wartości, napięcie piroelektryczne stopniowo zanika z powodu prądu upływu. Pyroelectricity nie powinny być mylone z termoelektrycznością: w typowej demonstracji piroelektryczności, cały kryształ jest zmieniany z jednej temperatury na inny, a wynik jest tymczasowym napięciem przez kryształ. W typowej demonstracji termoelektryczności jedna część urządzenia jest utrzymywana w jednej temperaturze, a druga w innej temperaturze, a wynik jest stałym napięciem w urządzeniu, o ile występuje różnica temperatur.
Definicja słowa pyroelectricity w słowniku
Definicja piroelektryczności w słowniku jest rozwinięciem przeciwnych ładunków na końcach osi pewnych kryształów hemiehedralnych, takich jak turmalin, w wyniku zmiany temperatury.
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Physics, Chemistry and Technology of Solid State Gas Sensor ...
Pyroelectricity: A 2300- Year History The phenomenon of pyroelectricity is not
new; it has some 2300 years of history. The first description of the pyroelectric
effect was published by the Greek philosopher Theophrastus (ca. 372-287 B.C.)
in his ...
High Quality Content by WIKIPEDIA articles! Pyroelectricity (from the Greek pyr, fire, and electricity) is the ability of certain materials to generate a temporary voltage when they are heated or cooled.
Jesse Russell, Ronald Cohn,
2012
3
The Beginnings of Piezoelectricity: A Study in Mundane Physics
Pyroelectricity As mentioned, Voigt assumed that like piezoelectricity,
pyroelectricity is due to innerdeformations in the crystals caused by
thermalexpansion. The Curies, R ̈ontgen, and Friedel had already advanced
the hypothesis that ...
Appendix. 4. Pyroelectricity. and. the. Electrocaloric. Effect. Table 1. Papers
presenting physical properties of specific materials for. Thermal changes in the
nonzero polarization of ferroelec- trics are described by the pyroelectric effect
and its ...
Carol Zwick Rosen, Basavaraj V. Hiremath, Robert Everest Newnham,
1992
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Systematic Study of
Pyroelectricity. Ferroelectricity and ...
The relation between ferroelectricity and pyroelectricity in the perovskites is explored using Devonshire's phenomenological theory of ferroelectricity and a new microscopic theory obtained by generalizing the conventional molecular field ...
M. I. Bell, P. M. Raccah, BELFER GRADUATE SCHOOL OF SCIENCE NEW YORK.,
1975
Pyroelectricity. The pyroelectric effect is defined as the change in spontaneous
polarisation, Ps, as a function of temperature, T. The pyroelectric coefficient, p, is
mathematically defined as shown in equation 1.4. p1⁄4 dPs dT ð1:4Þ The ...
Duncan W. Bruce, Dermot O'Hare, Richard I. Walton,
2011
CONCLUSIONS AND SOME SPECULATIONS We have two major objectives in
this chapter: (1) to concisely summarize the physics of pyroelectricity and closely
related effects and describe the techniques for measuring them; and (2) to ...
8
Mechanism of
Pyroelectricity in Polyvinylidene Fluoride Films
The objectives of this study were the exploration of the mechanisms(s) of pyroelectricity in polymers in order to achieve the highest possible pyroelectric coefficients with polar polymers, a determination of whether or not polyvinylidene ...
K. Takahashi, M. M. Labes, R. E. Salomon,
1978
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A Study of the Mechanism of
Pyroelectricity in Polymer Films
A study was undertaken of both theoretical and experimental aspects of the phenomenon of pyroelectricity in polymer films, focussing on polyvinylidene fluoride.
B. Oh, A. I. Baise, R. E. Salomon,
1975
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Pyroelectricity and Piezoelectricity in Nylon 11
Pyroelectric and piezoelectric properties of poly(vinylidene fluoride) have been widely reported in the literature. Investigations on similar properties in other classes of polymers have been relatively restricted.
Morton H. Litt, Che-hsiung Hsu, P. Basu,
1976
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pyroelectricity w wiadomościach.
Kansai University and Teijin develop first piezoelectric fabrics for …
Pyroelectricity is the ability of certain materials to generate a voltage and charge following a change in temperature. The existence of pyroelectricity is a very ... «Innovation in Textiles, Sty 15»
Apple Granted Patents for a Cellular Data Connected Smart Pen, the …
The patent notes that the device's rechargeable battery may also incorporate pyroelectricity and a custom-built solar cell. Most notably the pen could double as ... «Patently Apple, Kwi 14»
Harvesting free energy from the environment with polymer magic
Its remarkable properties, including extreme pyroelectricity and piezoelectricity, have lent its use to everything from thermal camera sensors to electrodes for ... «ExtremeTech, Kwi 14»
Will Apple iPen beat Galaxy S4?
The patent notes that the device's rechargeable battery may also incorporate pyroelectricity and a custom-built solar cell. The Cregle iPen, byt the way, isn't a ... «Emirates 24/7, Mar 13»
Smaller is Better – Understanding Pyroelectric Nanomaterials
“Measuring the pyroelectric response of thin films is difficult and has restricted the understanding of the physics of pyroelectricity, prompting some to label it as ... «The Green Optimistic, Sty 13»
Feeling the heat of pyroelectricity
Engineered pyroelectric materials represent a powerful approach to innovative applications in areas such as renewable energy and the development of new ... «nanotechweb.org, Cze 12»
Killer crystals turn pyroelectricity on bacteria
The crystal powders, which convert warmth into electrical energy and then chemical energy via the pyroelectric effect, could one day be used to disinfect air or ... «Chemistry World, Mar 12»
The band of health
... (pyroelectricity) or when pressure is applied to its surface (piezoelectricity); your body naturally emits heat which warms the power band and thus activating the ... «Daily News & Analysis, Lut 12»
Murata Tactile Controller TV remote hands-on (video)
The company's prototype remote uses touch-pressure pads and pyroelectricity to analyze the position of a piezoelectric film. In English: a plastic film produces ... «Engadget, Paz 11»
Bendable Remote Will Control Your TV
Ordinarily any piezoelectric substance is also subject to another effect called “pyroelectricity,” when a change in temperature creates a current. The problem is ... «Discovery News, Wrz 11»