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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Software for modeling concentration profiles during the process of ion implantation and thermal diffusion
 Nespěchal, Marek ; Vaněk, Jiří (referee) ; Chladil, Ladislav (advisor)
This thesis deals with the design and development of the CPCalc application used for the visualization of concentration profiles during the process of thermal diffusion and ion implantation. The application was designed with regard to its planned use in the laboratory teaching of material-oriented subjects at the UETE. The theoretical part of the thesis summarizes the technological process of semiconductor manufacturing and deals in detail with the technological processes for doping semiconductors – diffusion and ion implantation. The thesis presents the basic functioning and individual blocks of the CPCalc application, which is developed in the Python programming language in combination with the Tkinter library, a brief characterization of which is also included in this text.
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Stationary- and sliding beds in pipe flows of settling slurry
 Matoušek, Václav ; Krupička, Jan ; Chára, Zdeněk
Investigations are discussed on the effect of stationary- and sliding beds on a behavior of settling slurry flows. Results are presented of our recent experiments with two fractions of ballotini in a 100-mm-pipe loop. Experimental work contained measurements of concentration profiles and velocity profiles. The experimental results for flows with stationary deposits are compared with predictions using our formulae for solids transport and bed friction in layered flows. CFD simulations are included to validate the velocityprofile measurements and to verify the bed roughness predictions in the flows with stationary beds. Furthermore, the measured velocity profiles are compared to profiles predicted using the log law of the wall with boundary shear velocities determined from the linear distribution of shear stress across the pipe flow. The approach is successful in the flow below the upper wall of the pipe but fails above the top of the deposit where the stress distribution is different as verified by the CFD simulation. The concept of the linear-distribution of shear stress is well applicable in flows with sliding beds. An example is given of a solution for a partially-stratified flow with sliding bed using the 1-D Stress- Distribution based Model.
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