Application of solid-phase concentration-dependent HSDM to the acid dye adsorption system

AIChE Journal ◽  
2004 ◽  
Vol 51 (1) ◽  
pp. 323-332 ◽  
Author(s):  
Vinci K. C. Lee ◽  
John F. Porter ◽  
Gordon McKay ◽  
Alexander P. Mathews
Keyword(s):  
Solid Phase ◽  
Dye Adsorption ◽  
Adsorption System ◽  
Acid Dye ◽  
Phase Concentration ◽  
Solid Phase Concentration

Doping and Alloying of Hydrogenated Amorphous Germanium Films Prepared by DC-Magnetron Sputtering

1993 ◽  
Vol 297 ◽  
Author(s):  
T. DrÜsedau ◽  
A. Annen ◽  
B. SchrÖder
Keyword(s):  
Solid Phase ◽  
Dark Conductivity ◽  
Concentration Addition ◽  
Phase Concentration ◽  
N Doping ◽  
Solid Phase Concentration ◽  
Donor States ◽  
B Doping ◽  
Si Content ◽  
High Level

In this paper we present a detailed study of doping and alloying effects in a-Ge:H due to the incorporation of phosphorus, nitrogen, oxygen, boron, carbon and silicon. The film characterization was performed by means of quantitative analysis , optical absorption in the band and subband range and conductivity measurements. N and O were found to form donor states resulting in an increase of the dark conductivity up to five orders of magnitude. The maximum value of 0.3 (Ωcm)-1 has been obtained by N-doping of about 1 at% solid phase concentration, which exceeds the effect of P doping. B doping causes a decrease of the dark conductivity to a minimum of 10-6 (Ωcm)-1 at 150 ppm solid phase concentration. Addition of Si and C up to concentrations of about 5 at % does not influence the subgap absorption, where best values of E0<50 meV and α(0.6 eV)<10 cm-1 were obtained for the Urbach energy and midgap absorption, respectively. A Si content of 1 at % decreases the dark conductivity, whereas the normalized photoconductivity remains at a high level of ŋμτ=10-5 cm2V-1.

Wash-out of solid phase from the mechanically stirred charge

1980 ◽  
Vol 45 (8) ◽  
pp. 2152-2163 ◽  
Author(s):  
Václav Machoň ◽  
Vladimír Kudrna ◽  
Vlasta Hudcová
Keyword(s):  
Time Dependence ◽  
Fresh Water ◽  
Theoretical Approach ◽  
Solid Phase ◽  
Material Balance ◽  
Sufficient Accuracy ◽  
Experimental Measurements ◽  
Simple Material ◽  
Phase Concentration ◽  
Solid Phase Concentration

Experimental measurements were performed of the time dependence of solid phase concentration in suspension at the outlet from the apparatus with the mechanically stirred charge. Suspension was being withdrawn continuously with fresh water supplied into the charge. Validity of the theoretical approach proposed earlier has been verified by the performed experiments. It has been demonstrated that the studied effect can be under certain conditions described with sufficient accuracy by a simple material balance of the solid phase in the system.

Distribution of solid particles in a mixed vessel

1990 ◽  
Vol 55 (9) ◽  
pp. 2169-2181 ◽  
Author(s):  
Petr Bílek ◽  
František Rieger
Keyword(s):  
Solid Phase ◽  
Solid Particles ◽  
Concentration Measurement ◽  
Concentration Profiles ◽  
Conductivity Method ◽  
Phase Concentration ◽  
Solid Phase Concentration ◽  
Vessel Bottom ◽  
Vessel Axis

The aim of our research was to study the axial, radial and tangential solid phase concentration profiles in a mixed vessel. The conductivity method was used for the concentration measurement. We accomplished the measurement in eleven points in five heights above the vessel bottom. The points were situated on three vertical planes passing through the vessel axis and on five values of radii. It was determined by means of statistic test of variance if it was possible to measure the concentration only in one point in each distance from the vessel bottom and neglect the radial and tangential concentration differences.

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