The Influence of X Radiation on the Stability of Ferric Oxide Sol

1936 ◽  
Vol 9 (106) ◽  
pp. 631-636 ◽  
Author(s):  
J. A. Crowther ◽  
H. Liebmann ◽  
C. C. Mills
Keyword(s):  
Ferric Oxide ◽  
The Stability

scholarly journals Development and validation of analytical methodology with focus on the qualification of powder mixers

2015 ◽  
Vol 51 (2) ◽  
pp. 273-284 ◽  
Author(s):  
Pedro de Freitas Fiorante ◽  
Rodrigo Dias Martins ◽  
Mauri Sergio Alves Palma
Keyword(s):  
Hydrochloric Acid ◽  
Ferric Oxide ◽  
Analytical Procedure ◽  
Maximum Deviation ◽  
Hydrochloric Acid Concentration ◽  
Intermediate Precision ◽  
Analytical Methodology ◽  
Relative Standard ◽  
Performance Qualification ◽  
The Stability

<p>This study aims at developing an analytical procedure capable of quantifying the ferric oxide present in the mixture of ferric oxide/lactose monohydrate (0.4% w/w). The analytical procedure was checked for specificity, linearity, precision (system repeatability, procedure repeatability and intermediate precision), accuracy, stability of solutions and robustness of the procedure. The concentration of Fe (III) was determined by spectrophotometry at 480 nm based on calibration curves. The specificity was verified. The linearity was obtained in the range of 11.2 to 16.8 µg of ferric oxide/mL. The relative standard deviation (RSD) of the system repeatability, procedure repeatability and intermediate precision, were not more than 2%. The RSD of the accuracy values were less than 0.75%. The stability of the samples was checked over a 24 hours assay. In the robustness evaluation, the wavelength and the concentration of hydrochloric acid varied. The maximum absorbance deviation due to wavelength variation was 0.14 percent, and the maximum deviation due to the hydrochloric acid concentration variation was 2.4%, indicating that the concentration of hydrochloric acid is critical to the analysis of ferric oxide. The procedure developed was validated and is suitable to the performance qualification of powder mixers.</p>

FERRIC SALT AS THE “SOLUTION LINK” IN THE STABILITY OF FERRIC OXIDE HYDROSOL1

1923 ◽  
Vol 45 (11) ◽  
pp. 2522-2532 ◽  
Author(s):  
Arthur W. Thomas ◽  
Alexander Frieden
Keyword(s):  
Ferric Oxide ◽  
Ferric Salt ◽  
The Stability

scholarly journals The study of stability of the ferric oxide sols by zeta /ζ/ potential

2014 ◽  
Vol 15 ◽  
pp. 85-88
Author(s):  
D Bayarmaa ◽  
Kh Khureltogoo
Keyword(s):  
Ferric Oxide ◽  
Ζ Potential ◽  
Membrane Filters ◽  
Zeta Potentials ◽  
The Stability ◽  
Electrolyte Ph

In this study ferric oxide sols solutions were prepared in presence of different electrolyte and their zeta potentials were measured by simplified electrophoreses method with protective semi membrane filters. The stability of these sols solution was affected by particles size and electrolyte pH. DOI: http://doi.dx.org/10.5564/mjc.v15i0.329 Mongolian Journal of Chemistry 15 (41), 2014, p85-88

Effect of urea on the stability of ferric oxide hydrosols

1997 ◽  
Vol 125 (1) ◽  
pp. 1-3 ◽  
Author(s):  
H. Amhamdi ◽  
F. Dumont ◽  
C. Buess-Herman
Keyword(s):  
Ferric Oxide ◽  
The Stability

Open discussion

1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti
Keyword(s):  
Buenos Aires ◽  
Large Mass ◽  
List Type ◽  
Common Phenomenon ◽  
Open Discussion ◽  
The Stability ◽  
Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

Symmetric Multistep Methods Revisited: II. Numerical Experiments

1999 ◽  
Vol 173 ◽  
pp. 309-314 ◽  
Author(s):  
T. Fukushima
Keyword(s):  
Multistep Methods ◽  
Computational Time ◽  
Integration Time ◽  
Implicit Methods ◽  
Symmetric Methods ◽  
Celestial Bodies ◽  
The Stability ◽  
Predictor Corrector ◽  
Symmetric Multistep Methods ◽  
Integration Errors

AbstractBy using the stability condition and general formulas developed by Fukushima (1998 = Paper I) we discovered that, just as in the case of the explicit symmetric multistep methods (Quinlan and Tremaine, 1990), when integrating orbital motions of celestial bodies, the implicit symmetric multistep methods used in the predictor-corrector manner lead to integration errors in position which grow linearly with the integration time if the stepsizes adopted are sufficiently small and if the number of corrections is sufficiently large, say two or three. We confirmed also that the symmetric methods (explicit or implicit) would produce the stepsize-dependent instabilities/resonances, which was discovered by A. Toomre in 1991 and confirmed by G.D. Quinlan for some high order explicit methods. Although the implicit methods require twice or more computational time for the same stepsize than the explicit symmetric ones do, they seem to be preferable since they reduce these undesirable features significantly.

Uniformity of Magnification from Different Electron Microscopes

1967 ◽  
Vol 25 ◽  
pp. 32-33
Author(s):  
Godfrey C. Hoskins ◽  
V. Williams ◽  
V. Allison
Keyword(s):  
Diffraction Grating ◽  
The Other ◽  
Carbon Replica ◽  
Electron Microscopes ◽  
The Stability

The method demonstrated is an adaptation of a proven procedure for accurately determining the magnification of light photomicrographs. Because of the stability of modern electrical lenses, the method is shown to be directly applicable for providing precise reproducibility of magnification in various models of electron microscopes.A readily recognizable area of a carbon replica of a crossed-line diffraction grating is used as a standard. The same area of the standard was photographed in Phillips EM 200, Hitachi HU-11B2, and RCA EMU 3F electron microscopes at taps representative of the range of magnification of each. Negatives from one microscope were selected as guides and printed at convenient magnifications; then negatives from each of the other microscopes were projected to register with these prints. By deferring measurement to the print rather than comparing negatives, correspondence of magnification of the specimen in the three microscopes could be brought to within 2%.

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