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Systematic and statistical errors in correlation estimators obtained from various digital correlators (1999)

Kojro, Z. ; Riede, A. ; Schubert, M. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 70 (1999), S. 4487-4496

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: A number of commercially available digital correlators is discussed with respect to algorithms, systematic errors, and statistical errors. Special attention has been paid to the determination of an influence of the temporal integration of measured signals on autocorrelation functions measured in digital correlators. A calculation of the standard deviation for statistical errors in correlation estimators has been performed. The result is compared with the experiment. Favorable noise properties of the multiple-tau correlator which have been reported in the literature are not confirmed. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1150101

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Polyaniline dispersions 7. Dynamic light scattering study of particle formation (1997)

Riede, A. ; Helmstedt, M. ; Riede, V. ; [et al.]

Springer

Colloid & polymer science 275 (1997), S. 814-820

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ISSN: 1435-1536

Keywords: Key words Dynamic light scattering ; polyaniline ; dispersions ; dispersion polymerization ; colloidal silica ; submicrometer particles

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract When aniline is oxidized in the presence of colloidal silica, composite polyaniline–silica particles of submicrometer size are obtained. Dynamic light scattering was used to monitor the course of dispersion polymerization of aniline and the formation of particles. The increase of a hydrodynamic radius of particles was observed as polyaniline had been produced. Additional increase in particle size after polymerization has also been recorded. The rate of aniline polymerization was found to increase with increasing temperature in the range 0–50 °C. Well-defined particles are formed below 30 °C while above this temperature the colloidal stability of the resulting systems is limited. The activation energy of aniline polymerization was estimated.