Testing a KrCl excilamp as new enhanced UV source for 4-chlorophenol degradation: Experimental results and kinetic model

2010 ◽  
Vol 49 (1) ◽  
pp. 113-119 ◽  
Author(s):  
M. Gomez ◽  
M.D. Murcia ◽  
J.L. Gomez ◽  
G. Matafonova ◽  
V. Batoev ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Experimental Results

Nitrate and chloride formation in chloramination

1994 ◽  
Vol 30 (9) ◽  
pp. 101-110
Author(s):  
V. Diyamandoglu
Keyword(s):  
Kinetic Model ◽  
Analytical Method ◽  
Kinetic Data ◽  
Experimental Results ◽  
Mass Balances ◽  
Time Profiles ◽  
Slow Decay ◽  
Concentration Time ◽  
End Products ◽  
Chlorine Residuals

The formation of nitrate and chloride as end-products of chloramination (combined chlorination) was investigated at pH ranging between 6.9 and 9.6 at 25°C. The experimental results comprised concentration-time profiles of combined chlorine residuals along with nitrate and chloride. Nitrite, if present, was always below the detectibility limit of the analytical method used (25 ppb). Mass balances on chlorine species depicted that chloride formed during the slow decay of combined chlorine residuals does not account for all the chlorine lost. This substantiates the formation of other reaction end-products which are yet to be identified. A kinetic model for chloramination is proposed based on the kinetic data obtained in this study.

On the Impossibility of an OH-Radical Model for Photosynthetic Water Oxidation / Über die Unmöglichkeit eines OH-Radikalmodells für die photosynthetische Wasseroxidation

1972 ◽  
Vol 27 (2) ◽  
pp. 172-176 ◽  
Author(s):  
Gerhard Vierke
Keyword(s):  
Kinetic Model ◽  
Water Oxidation ◽  
Photosynthetic Apparatus ◽  
Experimental Results ◽  
Oh Radicals ◽  
Oh Radical ◽  
Inherent Property ◽  
Evolving System ◽  
Photosynthetic Water Oxidation ◽  
Radical Model

If it is assumed that the oscillating O2 flash yield sequence of algae and chloroplasts predominantly reflects an inherent property of the O2 evolving system of the photosynthetic apparatus it is shown that the OH-radical model (O2 production by recombination of four OH radicals) is contradictory to the experimental results because it predicts an aperiodic O2 flash yield sequence.Several experimental facts already known strongly indicate that the OH-radical model is not consistent with the kinetic model for O2 evolution of KOK et al. either.

A New Kinetic Model for The Nucleation and Growth of Self-Interstitial Clusters in Silicon

2001 ◽  
Vol 669 ◽  
Author(s):  
Christophe J. Ortiz ◽  
Daniel Mathiot
Keyword(s):  
Kinetic Model ◽  
Inverse Modeling ◽  
Nucleation And Growth ◽  
Experimental Results ◽  
Physical Parameters ◽  
Formation Energies ◽  
Good Agreement

ABSTRACTA model for nucleation and growth of {311} defects is proposed on the basis of thermodynamic and kinetic considerations. Simulated results are discussed and compared to experimental results found in the literature. According to our model it is found that formation energies of self-interstitial clusters depends on the local interstitial supersaturation. Physical parameters extracted from experimental results by inverse modeling are in good agreement with recent values published in the literature.

scholarly journals Kinetic Analysis for Agglomeration-Flotation of Finely Ground Chalcopyrite: Comparison of First Order Kinetic Model and Experimental Results

2020 ◽  
Vol 61 (10) ◽  
pp. 1940-1948
Author(s):  
Vothy Hornn ◽  
Mayumi Ito ◽  
Ryosuke Yamazawa ◽  
Hiromasa Shimada ◽  
Carlito Baltazar Tabelin ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Kinetic Analysis ◽  
Experimental Results ◽  
Order Kinetic ◽  
First Order ◽  
Order Kinetic Model

A kinetic model of superoxide production from single pulmonary alveolar macrophages

1989 ◽  
Vol 256 (2) ◽  
pp. C405-C412 ◽  
Author(s):  
K. A. DiGregorio ◽  
E. V. Cilento ◽  
R. C. Lantz
Keyword(s):  
Superoxide Dismutase ◽  
Kinetic Model ◽  
Cell Surface ◽  
Nadph Oxidase ◽  
Alveolar Macrophages ◽  
Experimental Results ◽  
Model Predictions ◽  
Pulmonary Alveolar Macrophages ◽  
Positively Charged ◽  
Steric Hindrances

A kinetic model was developed to describe the production of superoxide (O2-) by single pulmonary alveolar macrophages (PAM). Model predictions were compared with experimental results obtained from single rat PAM. The O2- was quantified by measuring the reduction of nitro blue tetrazolium (NBT) to a diformazan precipitate (NBTH2) from video-recorded images of individual cells. The kinetic model considered three reactions: 1) the production of extracellular O2- from the reduction of oxygen by NADPH oxidase using intracellular NADPH as the substrate, 2) the subsequent dismutation of O2- to form H2O2, and 3) the reaction of O2- and NBT to form diformazan. NBT specificity for O2- was analyzed by comparing results in the presence and absence of superoxide dismutase (SOD) that catalyzes the dismutation of O2- to H2O2. Measured PAM heterogeneity was accounted for by varying the concentration of intracellular NADPH, its rate of depletion, and the concentration of intracellular NADPH oxidase in the kinetic model. Model predictions compared favorably with experimental results except when SOD was present. This discrepancy may be due to diffusional limitations because NBT is a relatively small molecule (818 mol wt) compared with SOD (34,000 mol wt). In addition, the cell surface is both ruffled and negatively charged, which may introduce steric hindrances and/or electrostatic effects, since SOD is also negatively charged, whereas NBT is positively charged.

scholarly journals Zur Lumineszenzschädigung von ZnS/Cu

1969 ◽  
Vol 24 (6) ◽  
pp. 937-942 ◽  
Author(s):  
R. Grasser ◽  
A. Scharmann
Keyword(s):  
Kinetic Model ◽  
Radiation Damage ◽  
Green Emission ◽  
Experimental Results ◽  
Mass Energy ◽  
Proposed Model ◽  
Luminescent Centers

The resistance to radiation damage of the blue and green emission bands of ZnS/Cu is found to vary with mass, energy and dose of incident ions. The experimental results are discussed with Schön’s kinetic model and our proposed model for luminescent centers in ZnS.

A Kinetic Model for the Strain Relaxation in Heteroepitaxial Thin Film Systems

2001 ◽  
Vol 673 ◽  
Author(s):  
Y.W. Zhang ◽  
T.C. Wang ◽  
S.J. Chua
Keyword(s):  
Thin Film ◽  
Surface Roughness ◽  
Kinetic Model ◽  
Strain Relaxation ◽  
Experimental Results ◽  
Threading Dislocation ◽  
Threading Dislocations ◽  
Misfit Dislocations ◽  
Dislocation Reduction ◽  
Wide Range

ABSTRACTA kinetic model is presented to simulate the strain relaxation in the GexSi1−x/Si(100) systems. In the model, the nucleation, propagation and annihilation of threading dislocations, the interaction between threading dislocations and misfit dislocations, and surface roughness are taken into account. The model reproduces a wide range of experimental results. The implications of its predictions on the threading dislocation reduction during the growth processes of the heteoepitaxial thin film systems are discussed.

Kinetics of anaerobic cometabolism of 2,4-dinitrotoluene with ethanol as the primary substrate

1997 ◽  
Vol 36 (6-7) ◽  
pp. 271-278 ◽  
Author(s):  
Jiayang Cheng ◽  
Makram T. Suidan ◽  
Albert D. Venosa
Keyword(s):  
Kinetic Model ◽  
Kinetic Parameters ◽  
Competitive Inhibition ◽  
Methanogenic Bacteria ◽  
Experimental Results ◽  
Marquardt Algorithm ◽  
Levenberg Marquardt ◽  
Kinetics Of ◽  
Primary Substrate

A kinetic model that describes the anaerobic cometabolism of 2,4-dinitrtoluene (DNT) with ethanol as the primary substrate has been developed based on experimental results. The kinetic parameters were estimated using the Levenberg-Marquardt algorithm. 2,4-DNT is anaerobically biotransformed to 2,4-diaminotoluene (DAT) via 4-amino-2-nitrotoluene (4-A-2-NT) and 2-amino-4-nitrotoluene (2-A-4-NT) by the bacteria whose growth is supported by utilizing ethanol. 2,4-DNT shows inhibition to its own biotransformation. It also exhibits a very strong competitive inhibition to further biotransformation of 4-A-2-NT and 2-A-4-NT. All the aromatics in the system, 2,4-DNT, 4-A-2-NT, 2-A-4-NT, and 2,4-DAT, inhibit the conversion of ethanol. Hydrogen produced from the acetogenesis of ethanol is utilized for the transformation of the nitroaromatics. The utilization of hydrogen and acetate by methanogenic bacteria is very strongly inhibited by the presence of the nitroaromatics. Acetate exhibits strong competitive inhibition to the biodegradation of propionate.

Development of an Activity Based Kinetic Model for an Esterification Process with Indion 180 Catalyst

2019 ◽  
Vol 17 (9) ◽  
Author(s):  
Mekala Mallaiah ◽  
Chimmiri Venkateswarlu
Keyword(s):  
Kinetic Model ◽  
Reaction Rate ◽  
Experimental Results ◽  
Catalyst Loading ◽  
Esterification Reaction ◽  
Order Kinetic ◽  
Kinetic Rate ◽  
Model Predictions ◽  
Effects Of Temperature ◽  
Kinetics Of

Abstract The kinetics of esterification reaction between acetic acid and methanol was studied with the Indion 180 catalyst in the temperature range between 323.15 and 353.15K, and the catalyst loading between 0.01 g/cc to0.05 g/cc. The effects of temperature, catalyst loading, size of the catalyst and agitation speed on the reaction rate were investigated. The experimental results have shown the negligible effect of mass transfer resistances on the reaction rate. A second order kinetic rate expression was used to correlate the experimental data. An activity based kinetic model was also developed for the esterification process, which was validated against experimental results. The activity based model is found advantageous as it involves only two reaction rate parameters which were determined based on the kinetic rate parameters of the concentration based model. The comparison of the model predictions with the experimental results for different temperature and catalyst loading conditions has shown the better suitability of the activity based kinetic model for the esterification process with Indion 180 catalyst.

Kinetic model and experimental results for H2O and OH production rates on Pt

1987 ◽  
Vol 189-190 ◽  
pp. A443
Author(s):  
B. Hellsing ◽  
B. Kasemo ◽  
S. Ljungström ◽  
A. Rosén ◽  
T. Wahnström
Keyword(s):  
Kinetic Model ◽  
Experimental Results ◽  
Production Rates
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