نتایج جستجو برای: positive temperature coefficient

تعداد نتایج: 1233903  

2015
HoSung Lee

The formulation of the classical basic equations for a thermoelectric cooler from the Thomson relations to the non-linear differential equation with Onsager’s reciprocal relations was performed to basically study the Thomson effect in conjunction with the ideal equation. The ideal equation is obtained when the Thomson coefficient is assumed to be zero. The exact solutions derived for a commerci...

2006
Hui Chen Tianquan Lü Chuanwen Chen Wenwu Cao

Using a Ginzburg–Landau–Devonshire type model, the pyroelectric property and hysteresis loop are studied for a composite ferroelectric thin film that contains an insertion of a different type of ferroelectric material in parallel connection with the host ferroelectric film material. If these two types of ferroelectric materials are polarized along the same direction, there are two peaks occur i...

Journal: :Physical review. B, Condensed matter 1993
Rathnayaka Hennings Naugle

The resistivity of codeposited amorphous Til „Al films has been measured from 1.5 to 300 K over the composition range 0.4~x ~0.92, and the Hall coefficient has been measured at 4 K. The resistivity exhibits a relatively small temperature dependence. The magnitude of the room-temperature resistivity varies appreciably with composition, with a broad maximum around 250 pQ cm near x =0.5. The Hall ...

Journal: :The Journal of chemical physics 2012
Jürgen Troe Thomas M Miller Nicholas S Shuman Albert A Viggiano

Experimental data from the literature for cross sections and rate constants for dissociative electron attachment to CF(3)Br, with separately varied electron and gas temperatures, are analyzed by a kinetic modeling approach. The analysis suggests that electronic and nuclear contributions to the rate constants can be roughly separated, the former leading to a negative temperature coefficient, the...

2008
Gerald Dunne Changhai Lu

We compute the exact finite temperature effective action in a 0+1dimensional field theory containing a topological Chern-Simons term, which has many features in common with 2+1-dimensional Chern-Simons theories. This exact result explains the origin and meaning of puzzling temperature dependent coefficients found in various naive perturbative computations in the higher dimensional models. There...

Journal: :Proceedings of the National Academy of Sciences 1929

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