The interaction between multiple nanophase iron particles changes the slope of lunar reflectance spectra

2021 ◽  
Author(s):  
Mirza Arnaut ◽  
Kay Wohlfarth ◽  
Christian Wöhler
Keyword(s):  
Reflectance Spectra ◽  
Iron Particles ◽  
Nanophase Iron

scholarly journals Rigorous light-scattering simulations of nanophase iron space-weathering effects on reflectance spectra of olivine grains

Icarus ◽  
2020 ◽  
Vol 345 ◽  
pp. 113727 ◽  
Author(s):  
Antti Penttilä ◽  
Timo Väisänen ◽  
Johannes Markkanen ◽  
Julia Martikainen ◽  
Tomáš Kohout ◽  
...  
Keyword(s):  
Light Scattering ◽  
Reflectance Spectra ◽  
Space Weathering ◽  
Weathering Effects ◽  
Nanophase Iron

A MÖssbauer Study of Nanophase iron Produced by Mechanical Alloying

1992 ◽  
Vol 286 ◽  
Author(s):  
Yanxia Lu ◽  
R. C. Reno ◽  
L. Takacs
Keyword(s):  
Mechanical Alloying ◽  
Milling Time ◽  
Milling Process ◽  
Displacement Reaction ◽  
Iron Particles ◽  
Mössbauer Study ◽  
Bcc Iron ◽  
Magnetite Particles ◽  
Ferromagnetic Iron ◽  
Nanophase Iron

ABSTRACTBall milling has been used to mechanically induce the displacement reaction 3Fe3O4 + 8 Al → 9 Fe + 4 A12O3, in which fine magnetite particles (Fe3O4) are reduced to nanophase iron particles. The presence of initial, intermediate, and final phases are easily identified by Mössbauer spectroscopy on samples taken at various stages of the milling process.Our measurements confirm the gradual progress of the above reaction and also verify the presence of FeAl2O4 at intermediate milling times. The concentration of this phase reaches a maximum of 42% at a milling time of 100 minutes. After five hours, the sample is fully reduced and contains ferromagnetic bcc-iron and superparamagnetic iron particles. Further milling reduces the amount of ferromagnetic iron and increases the proportion of the superparamagnetic phase.

scholarly journals Simulations of Effects of Nanophase Iron Space Weather Products on Lunar Regolith Reflectance Spectra

2018 ◽  
Vol 853 (1) ◽  
pp. 71 ◽  
Author(s):  
J. Escobar-Cerezo ◽  
A. Penttilä ◽  
T. Kohout ◽  
O. Muñoz ◽  
F. Moreno ◽  
...  
Keyword(s):  
Space Weather ◽  
Lunar Regolith ◽  
Reflectance Spectra ◽  
Nanophase Iron

Structural Investigation of Iron Particles Used for Magnetic Recording Media

1980 ◽  
Vol 38 ◽  
pp. 406-407
Author(s):  
Alfred Baltz
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Microscope ◽  
Structural Investigation ◽  
Magnetic Interaction ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Recording Medium ◽  
Iron Particles ◽  
Transmission Electron

As part of a program to develop iron particles for next generation recording disk medium, their structural properties were investigated using transmission electron microscopy and electron diffraction. Iron particles are a more desirable recording medium than iron oxide, the most widely used material in disk manufacturing, because they offer a higher magnetic output and a higher coercive force. The particles were prepared by a method described elsewhere. Because of their strong magnetic interaction, a method had to be developed to separate the particles on the electron microscope grids.

Co FERRITE COATING EFFECT ON FINE IRON PARTICLES

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1839-C8-1840
Author(s):  
H.-X. Lu ◽  
X.-Y. Mao ◽  
Y.-W. Du ◽  
W. Yu ◽  
W.-F. Chen
Keyword(s):  
Iron Particles ◽  
Fine Iron

Study of vegetation red edge indices of reflectance spectra for crops of winter wheat cultivated in the steppe zone of Ukraine

2012 ◽  
Vol 18 (4(77)) ◽  
pp. 45-51
Author(s):  
G.M. Zholobak ◽  
◽  
Z.M. Shportiuk ◽  
O.N. Sibirtseva ◽  
S.S. Dugin ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Steppe Zone ◽  
Reflectance Spectra ◽  
Red Edge

FORMATION OF PYROPHORIC IRON PARTICLES BY H2 REDUCTION OF OXALATE AND OXIDES

2008 ◽  
Vol 7 (2) ◽  
pp. 87-97
Author(s):  
Rajesh V. Shende ◽  
Alok Vats ◽  
Zachary D. Doorenbos ◽  
Deepak Kapoor ◽  
Darold Martin ◽  
...  
Keyword(s):  
Iron Particles

Color Space Transformation using Neural Networks

2019 ◽  
Vol 2019 (1) ◽  
pp. 153-158
Author(s):  
Lindsay MacDonald
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Color Space ◽  
Reflectance Spectra ◽  
Network Architectures ◽  
Color Spaces ◽  
Natural Materials ◽  
Space Transformation ◽  
Color Space Transformation

We investigated how well a multilayer neural network could implement the mapping between two trichromatic color spaces, specifically from camera R,G,B to tristimulus X,Y,Z. For training the network, a set of 800,000 synthetic reflectance spectra was generated. For testing the network, a set of 8,714 real reflectance spectra was collated from instrumental measurements on textiles, paints and natural materials. Various network architectures were tested, with both linear and sigmoidal activations. Results show that over 85% of all test samples had color errors of less than 1.0 ΔE2000 units, much more accurate than could be achieved by regression.

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