Results 221 to 230 of about 8,575 (264)
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Chemicals in the Air: The Atmospheric System and Dispersal of Chemicals
1975Field studies are required to validate any numerical model of pesticide dispersion. The various complications which may arise must be considered in the design of the validation study.
R. L. Pitter, E. J. Baum
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Chemical Exfoliation of Vermiculite and the Production of Colloidal Dispersions
Science, 1967Chemical treatments involving ion exchange cause gross one-dimensional swelling in water of single crystals of vermiculite minerals. A delicate balance of forces holds the individual silicate layers (10 angstroms thick) parallel to one another although separated by several hundred angstroms.
G F, Walker, W G, Garrett
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Pheromones and Chemical Ecology of Dispersal and Foraging in Termites
2010Pheromones play a crucial role in the ecology of dispersal and foraging in termites. Sex-pairing pheromones possess a double role of long-range attraction to unite sexual partners and a short-range or contact attraction to maintain the pair during the tandem behaviour.
Bordereau, Christian, Pasteels, Jacques
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Chemical Investigation of Disperse Dyes in Patch Test Preparations
Dermatitis, 2007Background: Contact allergy to textile dyes is not uncommon. The allergy is detected by patch testing patients with commercial patch test preparations.Objective: To investigate 8 disperse dyes (DDs) used for patch testing in the departments in Malmö and in Leuven and to compare them with test preparations used at various dermatology departments ...
Kristina, Ryberg +7 more
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A Lagrangian dispersion model with chemical reactions
International Journal of Environment and Pollution, 2011A Lagrangian stochastic (single particle) model is modified in order to account for simple chemistry reactions and tested against measured wind tunnel data. These data refers to a reactive plume generated by a single point source of NO inside a turbulent grid flow doped with ozone.
Alessandrini S, Ferrero E, Belfiore G
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BIODEGRADATION OF A CHEMICALLY DISPERSED CRUDE OIL
International Oil Spill Conference Proceedings, 1981ABSTRACT The n-alkane fraction of Prudhoe Bay crude oil dispersed with Corexit 9527 disappeared rapidly from the water column directly beneath a seawater surface slick contained by an enclosure. Biodegradation appeared to be more important than nonbiological volatilization or photooxidation processes.
W. J. Cretney +5 more
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Chemicals in the Environment, Dispersive Transport
2012Dispersion is the enhanced mixing of material through spatial variations in velocity. When it is of interest (when we are not keeping track of the three-dimensional mixing), dispersion is typically one or two orders of magnitude greater than turbulent diffusion.
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Evaluation Of The Effectiveness Of Oil-Dispersing Chemicals
International Oil Spill Conference Proceedings, 1969Abstract A procedure for evaluating the effectiveness of oil-dispersing chemicals has been developed. Using the apparatus originally designed for the Navy specification for solvent-emulsifiers, test conditions were adapted to correspond more closely to typical environmental conditions.
T.A. Murphy, L.T. McCarthy
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Effect of passive chemical reaction on turbulent dispersion.
AIAA Journal, 1968As the injection velocity increases (decreasing values of m) the thermal layer is blown further away from the wall since T]T = Q(l/Pr m). For a sufficiently small value of m, the thermal layer will be far from the wall where the series expansion for / will not be valid. This value of m is found by rewriting Eq.
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Chemical Kinetics in Dispersed-Phase Reactors
International Journal of Chemical Reactor Engineering, 2003Many chemical engineering processes occur under conditions when a dispersed phase undergoes fragmentation (breakup) and/or aggregation (coalescence). It is of considerable interest to model a chemical process that occurs at the interface and therefore depends on the evolving size distribution of the dispersed phase.
Ben J McCoy, Giridhar Madras
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