Algorithm for Calculating the Initial Defect Structure of Semiconductor Silicon
Vitalyi Igorevich Talanin,
Igor Evgenievich Talanin,
Vladislav Igorevich Lashko
Issue:
Volume 2, Issue 5, October 2017
Pages:
77-88
Received:
5 June 2017
Accepted:
21 June 2017
Published:
28 November 2017
Abstract: An algorithm for calculating the defect structure of semiconductor silicon crystals was proposed. The proposed approach makes it possible to calculate the sizes, distribution densities of grown-in microdefects at any point of the crystal. Calculations are performed by using and analyzing the thermal conditions of crystal growth in the temperature range from 1683 K to 300 K. The algorithm flowchart is given.
Abstract: An algorithm for calculating the defect structure of semiconductor silicon crystals was proposed. The proposed approach makes it possible to calculate the sizes, distribution densities of grown-in microdefects at any point of the crystal. Calculations are performed by using and analyzing the thermal conditions of crystal growth in the temperature r...
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Comparative Analysis Between Cam and Cam-less Valve Actuating for Automotive System
Aliyu Bhar Kisabo,
Musa James Ibrahim,
Opasina Ayodele Oluwafemi
Issue:
Volume 2, Issue 5, October 2017
Pages:
89-98
Received:
15 March 2017
Accepted:
17 April 2017
Published:
28 November 2017
Abstract: A promising alternative of the conventional camshaft in internal combustion engines is one that replaces the camshaft with electromagnetic actuators. This so-called camless system provides great opportunities for the automotive industry. To investigate the advantage of the system against the cam system firstly, we modelled the lift profiles of both systems with novel mathematical expressions. For the camless system we modelled an Electromagnetic Valve Actuating (EMVA) system that captures a plant transfer function and a PID controller with a set-point tracking scheme. Simulation result in MATLAB/Simulink of the theoretical camless lift profile was imported into Curve Fitting (CF) Toolbox of MATLAB and the novel mathematical model was realized. Experimentally measured data for the camless lift profile were then fitted with this model and a tuned experimental model was realized. While for the cam system, the mathematical model was developed directly from experimental data via Curve Fitting Toolbox of MATLAB. Secondly, we computed volumetric efficiencies of both systems using the novel mathematical lift profiles at different engine speeds. The camless system was observed to outperform the cam system.
Abstract: A promising alternative of the conventional camshaft in internal combustion engines is one that replaces the camshaft with electromagnetic actuators. This so-called camless system provides great opportunities for the automotive industry. To investigate the advantage of the system against the cam system firstly, we modelled the lift profiles of both...
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