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    Wyświetlanie 1-3 z 3
    Tytuł:
    Theoretical simulation of temperature distribution in a gun barrel based on the DPL model
    Autorzy:
    Talaee, Mohammad Reza
    Hosseinli, Seyed Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/280853.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    DPL model
    closed form solution
    gun barrel
    exponential decaying heat flux
    Opis:
    In this paper, an exact closed form solution is introduced for the heat conduction equation in cylindrical coordinates under consecutive inner time dependent surface heat flux by both the Fourier and dual-phase-lag (DPL) models. The solution is used to calculate the temperature distribution in a gun barrel subjected to single and consecutive shoots, and the results are compared with literature. The parametrical study is done using the analytical solution to show the effect of shooting frequency which leads to different heat power from each fire shoot and temperature distribution. The result shows good ability of analytical solution for estimation of temperature distribution in the gun barrel, especially under consecutive shoots in which unexpected incidents such as barrel melting is so probable. The closed form solution can be applied for verification of other numerical works in this area.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 685-696
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Area equivalent WKB Compact modeling approach for tunneling probability in Hetero-Junction TFETs including ambipolar behaviour
    Autorzy:
    Horst, Fabian
    Farokhnejad, Atieh
    Darbandy, Ghader
    Iñíguez, Benjamín
    Kloes, Alexander
    Powiązania:
    https://bibliotekanauki.pl/articles/397787.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    TFET
    tunneling probability
    WKB approximation
    heterojunction
    compact modeling
    closed-form
    double-gate
    DG
    ambipolarity
    modelowanie kompaktowe
    dwubiegunowość
    Opis:
    This paper introduces an innovative modeling approach for calculating the band-to-band (B2B) tunneling probability in tunnel-field effect transistors (TFETs). The field of application is the usage in TFET compact models. Looking at a tunneling process in TFETs, carriers try to tunnel through an energy barrier which is defined by the device band diagram. The tunneling energy barrier is approximated by an approach which assumes an area equivalent (AE) triangular shaped energy profile. The simplified energy triangle is suitable to be used in the Wentzel-Kramers-Brillouin (WKB) approximation. Referring to the area instead of the electric field at individual points is shown to be a more robust approach in terms of numerical stability. The derived AE approach is implemented in an existing compact model for double-gate (DG) TFETs. In order to verify and show the numerical stability of this approach, modeling results are compared to TCAD Sentaurus simulation data for various sets of device parameters, whereby the simulations include both ON- and AMBIPOLAR-state of the TFET. In addition to the various device dimensions, the source material is also changed to demonstrate the feasibility of simulating hetero-junctions. Comparing the modeling approach with TCAD data shows a good match. Apart the limitations demonstrated and discussed in this paper, the main advantage of the AE approach is the simplicity and a better fit to TCAD data in comparison to the quasi-2D WKB approach.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2018, 9, 2; 47-59
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bessel matrix differential equations: explicit solutions of initial and two-point boundary value problems
    Autorzy:
    Navarro, Enrique
    Company, Rafael
    Jódar, Lucas
    Powiązania:
    https://bibliotekanauki.pl/articles/1340656.pdf
    Data publikacji:
    1993
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    initial value problem
    closed form solution
    fundamental set
    boundary value problem
    Bessel matrix equation
    Opis:
    In this paper we consider Bessel equations of the type $t^2 X^{(2)}(t) + t X^{(1)}(t) + (t^2 I - A^2)X(t) = 0$, where A is an n$\times$n complex matrix and X(t) is an n$\times$m matrix for t > 0. Following the ideas of the scalar case we introduce the concept of a fundamental set of solutions for the above equation expressed in terms of the data dimension. This concept allows us to give an explicit closed form solution of initial and two-point boundary value problems related to the Bessel equation.
    Źródło:
    Applicationes Mathematicae; 1993-1995, 22, 1; 11-23
    1233-7234
    Pojawia się w:
    Applicationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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