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  1. 2 Acta Physica Polonica A

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  1. 2 2012

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  1. 2 Hatzikraniotis E.

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Models for the Analysis of~IR Reflectivity in TlBiTe_2 with Different Size of Twins

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Hatzikraniotis E.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 1
284-286
EN
In this work TlBiTe_2 were grown by a modified Bridgman technique and examined samples had different lateral dimensions of twins, ranging from 0.1 μm to 1 μm. The average lateral size of the twins seems to affect free carrier concentration and plasma frequency. Infrared spectra were analyzed by two models, the extended Drude model and a generalized empirical model of frequency-dependent damping factor. Increase in size of twins affects the electronic properties and hence plasma reflectivity and free carrier concentration of TlBiTe_2.
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On the Recovery of Wasted Heat Using a Commercial Thermoelectric Device

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Hatzikraniotis E.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 1
287-289
EN
Waste heat recovery from car's exhaust gases provides an opportunity to significantly improve the overall car engine efficiency. One approach for recovering energy from the exhaust gases is to generate electrical power through thermoelectric conversion. A thermoelectric device, using a commercially available thermoelectric generator module was made, in order to measure the gained power and efficiency at different places of the exhaust pipe of a small size car (Toyota Starlet, 1300cc), for various engine loads. With the use of a modeling approach, we evaluated the thermal contact resistances and their influence on the final device efficiency.
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