Process Modeling for Dynamic Disperse Particle Separation and Deposition Processes

2020 ◽  
pp. 3-35
Author(s):  
Sören Sander ◽  
Lizoel Buss ◽  
Udo Fritsching
Keyword(s):  
Process Modeling ◽  
Disperse Particle ◽  
Particle Separation ◽  
Deposition Processes

Chemical and Electrochemical Heteroepitaxial Growth of Chalcogenide Semiconductors from Solutions

1996 ◽  
Vol 451 ◽  
Author(s):  
D. Lincot ◽  
M. J. Furlong ◽  
M. Froment ◽  
R. Cortes ◽  
M. C. Bernard
Keyword(s):  
Heteroepitaxial Growth ◽  
X Ray Diffraction ◽  
Basic Principles ◽  
Lattice Match ◽  
X Ray ◽  
Chalcogenide Semiconductors ◽  
Influence Of Temperature On ◽  
Deposition Processes ◽  
A Site ◽  
Site Selective

ABSTRACTChalcogenide semiconductors have been deposited epitaxially from aqueous solutions either chemically or electrochemically at growth rates of up to 0.7 μmhr−1. After recalling the basic principles of these deposition processes, results are presented concerning chemically deposited CdS on InP, GaP and CuInSe2 substrates, electrodeposited CdTe on InP, and CdSAnP heterostructures. Characterisation of these structures by RHEED, TEM, HRTEM, and glazing angle X ray diffraction allows to analyse the effects of substrate orientation, polarity, lattice match plus the influence of temperature on epitaxial growth. These results are discussed in terms of self organisation and a site selective growth mechanisms due to the free enegy of formation of each compound.

Synthesis of dispersed mesoporous powders solid solution Zr0.88Ce0.12O2 for catalyst carrier of the conversion of methane to synthesis –gas

2020 ◽  
pp. 73-83
Author(s):  
L. V. Morozova ◽  
◽  
I. A. Drozdova ◽  
Keyword(s):  
Solid Solution ◽  
Total Pore Volume ◽  
Nitrogen Adsorption ◽  
Primary Crystal ◽  
X Ray ◽  
Catalyst Carrier ◽  
Conversion Of Methane ◽  
Deposition Processes ◽  
Zirconia Oxide ◽  
Coprecipitation Of Hydroxides

The xerogels in the system 0.88 mol.% ZrO2 − 0.12 mol.% CeO2 were obtained by the method of coprecipitation in a neutral (pH = 7) and slightly alkaline (pH = 9) medium under the influence of ultrasound with the size of the agglomerates 70 – 230 nm. It is shown that the coprecipitation of hydroxides of zirconium and cerium at pH = 9 with the use of ultrasonic treatment facilitates the formation of a primary crystal is symbolic of the particles in the xerogel, whose size is ~ 5 nm, whereas the xerogel synthesized in a neutral environment consists only of the x-ray amorphous phase. The effect of pH-precipitation on deposition processes of dehydration of the xerogels and crystallization solid solution based on zirconia oxide in the metastable pseudocubic modification (с′-ZrO2) was discovered. It was found that in the temperature range 500 – 800 °C there is a phase transition с′-ZrO2 → t-ZrO2, the size of the crystallites of the formed tetragonal solid solutions is 8 and 11 nm. The method of low-temperature nitrogen adsorption were investigated dispersion properties and characteristics of the pore structure of the powders of the solid solution Zr0.88Ce0.12O2. It is determined that the specific surface area of t-ZrO2 samples obtained after firing at 800 °C is 117 and 178 m2/g, the total pore volume reaches 0.300 − 0.325 cm3/g, the pore size distribution is monomodal and is in the range of 2 − 8 nm. The effect of thermal “aging” at a temperature of 800 °C (40 h) on the structure and dispersion of the solid solution t-ZrO2 powders was studied.

Process modeling using Sugars(TM) – Beet factory

2016 ◽  
pp. 505-513
Author(s):  
L. Warner Weiss
Keyword(s):  
Process Modeling ◽  
Microsoft Excel

Das Programm Sugars™ für Windows® erstellt komplett die Massen-, Energie- und Farbbilanzen für Rüben- und Rohrzuckerfabriken sowie Raffinerien. Das Programm simuliert nahezu jeden Prozess der Zuckergewinnung. In diesem Beitrag wird die Simulation einer Rübenzuckerfabrik mit Melasseentzuckerung mittels chromatographischer Trennung vorgestellt. Das vollständig integrierte Modell beinhaltet die in die Schneidemaschinen gelangenden Schnitzel bis hin zur chromatographischen Abtrennung der Saccharose aus Melasse und der Einengung von Extrakt, Betain und Raffinat. Außerdem enthält es Angaben zur Dampf- und Stromerzeugung. Sugars stellt Schnittstellen für den Datenimport und -export bereit. Ein Beispiel zeigt den Export der Turbogeneratordaten des Modells nach Microsoft Excel®. Hierbei wird der isentrope Wirkungsgrad unter Verwendung der Willans-Linie modifiziert, um die Leistungsfähigkeit des Turbogenerators zu verändern. Der so berechnete isentrope Wirkungsgrad wird zur Neubilanzierung des Modells von Excel wieder nach Sugars exportiert.

Formalized Approach for Componentized Software Process Modeling

2011 ◽  
Vol 22 (1) ◽  
pp. 1-16
Author(s):  
Jian ZHAI ◽  
Qiu-Song YANG ◽  
Jun-Chao XIAO ◽  
Ming-Shu LI
Keyword(s):  
Process Modeling ◽  
Software Process ◽  
Software Process Modeling
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