Determination of a Mathematical Discrete Model for the Study of Thermoelectric Materials with the Use of the Microprobe

2006 ◽  
Author(s):  
Antonio Lopez ◽  
Francisco Villasevil ◽  
Rafael Pindado ◽  
German Noriega ◽  
Dieter Platzek
Keyword(s):  
Thermoelectric Materials ◽  
Discrete Model

scholarly journals Determination of host and dopant ion distribution in Mg2Si1−x Sn x thermoelectric materials by electron channelling

2019 ◽  
Vol 75 (a2) ◽  
pp. e321-e321
Author(s):  
Andreas Delimitis ◽  
Vidar Hansen ◽  
Elli Symeou ◽  
Theodora Kyratsi ◽  
Mona Wetrhus Minde ◽  
...  
Keyword(s):  
Thermoelectric Materials ◽  
Ion Distribution ◽  
Electron Channelling

scholarly journals Analytical Method for Determination of Internal Forces of Mechanisms and Manipulators

Robotics ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 53 ◽  
Author(s):  
Muratulla Utenov ◽  
Tarek Sobh ◽  
Zhumadil Baigunchekov ◽  
Saltanat Zhilkibayeva ◽  
Sarosh Patel
Keyword(s):  
Cross Sections ◽  
Discrete Model ◽  
Discrete Models ◽  
Dynamic Loads ◽  
Dynamic Equations ◽  
Analytical Determination ◽  
Kinematic Characteristics ◽  
Internal Forces ◽  
Rigid Joints

This paper presents a theory for the analytical determination of internal forces in the links of planar linkage mechanisms and manipulators with statically determinate structures, considering the distributed dynamic loads. Linkage mechanisms and manipulators were divided into elements and joints. Discrete models were created for both the elements and the entire mechanism. The dynamic equations of equilibrium for the discrete model of the elements and the hinged and rigid joints, under the action of longitudinal and transverse distributed dynamic trapezoidal loads, were derived. In the dynamic equations of the equilibrium of the discrete model of the elements and joints, the connections between the components of the force vector in the calculated cross-sections and the geometric, physical, and kinematic characteristics of the element were established for its plane-parallel motion. According to the developed technique, programs were created in the Maple system, and animations of the motion of the mechanisms were produced. The links were constructed with the intensity of transverse- and longitudinal-distributed dynamic loads, bending moments, and shearing and normal forces, depending on the kinematic characteristics of the links.

scholarly journals Fast, accurate and non-empirical determination of the lattice thermal conductivities of I-III-VI2 chalcopyrite semiconductors

2021 ◽  
Author(s):  
Jose J. Plata ◽  
Victor Posligua ◽  
Antonio Marquez ◽  
Javier Fernández Sanz ◽  
Ricardo Grau-Crespo
Keyword(s):  
Thermoelectric Materials ◽  
Density Functional ◽  
Computational Cost ◽  
Large Family ◽  
Density Functional Theory Calculations ◽  
Boltzmann Transport ◽  
Empirical Determination ◽  
Thermal Conductivities

The use of computer simulation to predict the lattice thermal conductivity of materials has the potential to accelerate the discovery of new thermoelectric materials. However, the accurate prediction of this property from first principles, without input from experiment, is very computationally demanding, which limits the use of high-throughput strategies in thermoelectric materials design. We present here an accurate, fast, and non-empirical determination of the lattice thermal conductivities of a large family of semiconductors, with composition ABX2 (I-III-VI2), with A=Cu, Ag; B=Al, Ga, In, Tl; and X=S, Se, Te. We solve the Boltzmann transport equation with force constants derived from density functional theory calculations and machine-learning-based regression algorithms, reducing between one and two orders of magnitude the computational cost with respect to conventional approaches of the same accuracy. The results are in good agreement with available experimental data and allow us to rationalize the role of chemical composition, temperature and nanostructuring on the thermal conductivities across this important family of semiconductors.

Sign in / Sign up

Export Citation Format

Share Document