Search Results - (Author, Cooperation:M. B. Madsen)
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1R. M. Williams ; J. P. Grotzinger ; W. E. Dietrich ; S. Gupta ; D. Y. Sumner ; R. C. Wiens ; N. Mangold ; M. C. Malin ; K. S. Edgett ; S. Maurice ; O. Forni ; O. Gasnault ; A. Ollila ; H. E. Newsom ; G. Dromart ; M. C. Palucis ; R. A. Yingst ; R. B. Anderson ; K. E. Herkenhoff ; S. Le Mouelic ; W. Goetz ; M. B. Madsen ; A. Koefoed ; J. K. Jensen ; J. C. Bridges ; S. P. Schwenzer ; K. W. Lewis ; K. M. Stack ; D. Rubin ; L. C. Kah ; J. F. Bell, 3rd ; J. D. Farmer ; R. Sullivan ; T. Van Beek ; D. L. Blaney ; O. Pariser ; R. G. Deen
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-06-01Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
2D. F. Blake ; R. V. Morris ; G. Kocurek ; S. M. Morrison ; R. T. Downs ; D. Bish ; D. W. Ming ; K. S. Edgett ; D. Rubin ; W. Goetz ; M. B. Madsen ; R. Sullivan ; R. Gellert ; I. Campbell ; A. H. Treiman ; S. M. McLennan ; A. S. Yen ; J. Grotzinger ; D. T. Vaniman ; S. J. Chipera ; C. N. Achilles ; E. B. Rampe ; D. Sumner ; P. Y. Meslin ; S. Maurice ; O. Forni ; O. Gasnault ; M. Fisk ; M. Schmidt ; P. Mahaffy ; L. A. Leshin ; D. Glavin ; A. Steele ; C. Freissinet ; R. Navarro-Gonzalez ; R. A. Yingst ; L. C. Kah ; N. Bridges ; K. W. Lewis ; T. F. Bristow ; J. D. Farmer ; J. A. Crisp ; E. M. Stolper ; D. J. Des Marais ; P. Sarrazin
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-09-28Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
3P. Y. Meslin ; O. Gasnault ; O. Forni ; S. Schroder ; A. Cousin ; G. Berger ; S. M. Clegg ; J. Lasue ; S. Maurice ; V. Sautter ; S. Le Mouelic ; R. C. Wiens ; C. Fabre ; W. Goetz ; D. Bish ; N. Mangold ; B. Ehlmann ; N. Lanza ; A. M. Harri ; R. Anderson ; E. Rampe ; T. H. McConnochie ; P. Pinet ; D. Blaney ; R. Leveille ; D. Archer ; B. Barraclough ; S. Bender ; D. Blake ; J. G. Blank ; N. Bridges ; B. C. Clark ; L. DeFlores ; D. Delapp ; G. Dromart ; M. D. Dyar ; M. Fisk ; B. Gondet ; J. Grotzinger ; K. Herkenhoff ; J. Johnson ; J. L. Lacour ; Y. Langevin ; L. Leshin ; E. Lewin ; M. B. Madsen ; N. Melikechi ; A. Mezzacappa ; M. A. Mischna ; J. E. Moores ; H. Newsom ; A. Ollila ; R. Perez ; N. Renno ; J. B. Sirven ; R. Tokar ; M. de la Torre ; L. d'Uston ; D. Vaniman ; A. Yingst
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-09-28Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
4Madsen, M. B. ; Mørup, S. ; Costa, T. V. V. ; Knudsen, J. M. ; Olsen, M.
[s.l.] : Nature Publishing Group
Published 1986Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The sample of the carbonaceous chondrite Orgueil was ground into a powder and a Mossbauer absorber was prepared in a plexiglass absorber holder. Mossbauer spectra were obtained at various applied magnetic fields and temperatures. Figure 1 shows a series of Mossbauer spectra of the meteorite ...Type of Medium: Electronic ResourceURL: -
5Koch, C. Bender ; Oxborrow, C. A. ; Mørup, S. ; Madsen, M. B. ; Quinn, A. J. ; Coey, J. M. D.
Springer
Published 1995Staff ViewISSN: 1432-2021Source: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyGeosciencesPhysicsNotes: Abstract Magnetization curves and high-field Mössbauer spectra are used to deduce a model for the magnetic order in synthetic samples of δ-FeOOH (feroxyhyte), which takes account of the changes in magnetization when the samples are heated at 105 °C. Feroxyhyte is essentially a planar antiferromagnet with the net sublattice moments aligned parallel or antiparallel to c. Each particle acquires a net moment due to the very small number of layers along the c-direction, and the presence of surface steps causing the formation of ferrimagnetic domains with an odd number of layers. There is some spin canting which is related to the crystallinity of the sample. The decrease in magnetization following heating is mainly due to an increase in the extent of antiferromagnetic coupling between the closely packed ferrimagnetic particles, but changes in the spin canting within the bulk may also contribute. A typical, rather well crystallized specimen has magnetization σ=14 JT−1 kg−1 and Curie temperature T c=455 K.Type of Medium: Electronic ResourceURL: -
6Staff View
ISSN: 1572-9540Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract A ferrofluid with ultrasmall magnetic particles (d≅3.3 nm) of amorphous Fe1−x C x has been studied by Mössbauer spectroscopy and electron microscopy. The values of the particle size estimated by the two methods are in good agreement. The magnetic anisotropy energy constant,K=(1.0±0.3)×105 J m−3 has been estimated.Type of Medium: Electronic ResourceURL: -
7Lipka, J. ; Jensen, H. G. ; Knudsen, J. M. ; Madsen, M. B. ; Bentzon, M. D. ; Koch, C. B. ; Mørup, S.
Springer
Published 1992Staff ViewISSN: 1572-9540Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The iron mineralogy of samples of the Monturaqui impactite has been studied by Mössbauer spectroscopy. Magnetite, maghemite, goethite and a ferrous glass phase were identified. In a magnetic separate a bcc-structured iron-nickel alloy was identified in addition to the oxide phases. The oxides have formed by weathering of iron-nickel alloys.Type of Medium: Electronic ResourceURL: -
8Knudsen, J. M. ; Madsen, M. B. ; Olsen, M. ; Vistisen, L. ; Koch, C. B. ; Mørup, S. ; Kankeleit, E. ; Klingelhöfer, G. ; Evlanov, E. N. ; Khromov, V. N. ; Mukhin, L. M. ; Prilutski, O. F. ; Zubkov, B. ; Smirnov, G. V. ; Juchniewicz, J.
Springer
Published 1992Staff ViewISSN: 1572-9540Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract A Mössbauer spectrometer is included in the preliminary payload of a rover to be placed on the surface of Mars in the Soviet mission to the planct in 1996/1,2/. In counection with the American planctary program it has also been suggested to construct a Mössbauer spectrometer to be landed on Mars /3, 4/. The objective is to study the iron compounds of the Martian soil and rocks by backscattering Mössbauer spectroscopy. The paper describes the significance of the element iron in the study of the evolution of the planetary system and what we might expect to learn from Mössbauer spectroscopy of the surface materials of Mars. The study of Mars is expected to expand substantially in the coming decades, probably culminating with a manned flight to the planet. The international Mössbauer community may contribute significantly to the preparation of these events.Type of Medium: Electronic ResourceURL: -
9Staff View
ISSN: 1572-9540Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The meteorite Orgueil is a carbonaceous chondrite of type CI. Carbonaceous chondrites contain Fe(III), Fe(II) and in some cases metallic iron, indicating that they are in a state far from thermodynamic equilibrium. In Orgueil about 40% of the iron is present in magnetite (Fe3O4). In this work a sample of magnetite grains extracted from Orgueil has been studied by Mössbauer spectroscopy. It has been found that the magnetic phase contains about 11% of maghemite and that the remaining magnetite has a vacancy concentration smaller than 0.006, corresponding to the formula Fe2.994O4.Type of Medium: Electronic ResourceURL: -
10Madsen, M. B. ; Agerkvist, D. P. ; Gunnlaugsson, H. P. ; Hviid, S. Faurschou ; Knudsen, J. M. ; Vistisen, L.
Springer
Published 1995Staff ViewISSN: 1572-9540Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The significance of the element titanium for the study of the magnetic mineral in the surface dust of Mars is described.Type of Medium: Electronic ResourceURL: -
11Staff View
ISSN: 1572-9540Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract Magnetite is the most common magnetic phase in carbonaceous chondrites. Comprehensive and detailed investigations of this magnetite with X-ray diffraction and electron microprobe have revealed minute amounts of substitutional impurities (e.g. Ni) in the magnetite, but no other magnetic oxides have been found in these meteorites. Using an external magnetic field and Mössbauer spectroscopy, we have found a component in the Mössbauer spectrum that we attribute to maghemite. The relative area of this component implies that maghemite accounts for approximately 12% of the magnetic oxides in Orgueil.Type of Medium: Electronic ResourceURL: -
12Hviid, S. Faurschou ; Agerkvist, D. P. ; Olsen, M. ; Koch, C. Bender ; Madsen, M. B.
Springer
Published 1994Staff ViewISSN: 1572-9540Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract We have modified the iron-containing layer silicate nontronite into a magnetic sample by heat treatment at 900Type of Medium: Electronic ResourceURL: -
13Staff View
ISSN: 1572-9540Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The meteorites called carbonaceous chondrites are the least altered samples we have of the material which formed our solar system. Using57Fe Mössbauer spectroscopy we show that the carbonaceous chondrite Murchison contains a compound exhibiting superparamagnetic relaxation below 80 K.Type of Medium: Electronic ResourceURL: