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  • 1
    Electronic Resource
    Electronic Resource
    Phase changes in plasma-sprayed zinc-nickel ferrite : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5355-5357 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic and crystalline properties of a plasma-sprayed coating of the microwave absorbing zinc-nickel ferrite, (Zn0.41Ni0.59 )Fe2O4 have been studied at 300 K using the Mössbauer effect and x-ray diffraction (XRD). Both techniques indicate that the plasma-sprayed material separated into two phases. The first is a nickel-rich phase with magnetic fields of 47.5 and 44.5 T at the tetrahedral and octahedral sites, respectively. The second is a zinc-rich phase, zinc meta-ferrite, having a small magnetic field of 4.2 T. The quadrupole splitting of this second phase is ΔE=0.34 mm s−1, which is the same as in pure nonmagnetic zinc ferrite. XRD analysis shows that the zinc-rich phase remains cubic with a0= 8.389 A(ring) and the zinc meta-ferrite phase is tetragonal with the same lattice parameters as the cubic phase except for one elongated axis given by c0 =8.488 A(ring). This is much larger than the spacing for any of the series of zinc-nickel ferrites. The isomer shift of the zinc meta-ferrite is 0.710 mm s−1, which indicates that a large fraction of Fe3+ was reduced during the spraying process. Annealing the sprayed coating at temperatures less than 400 °C converted the zinc meta-ferrite into a magnetic phase that now exhibits magnetic fields close to those in the nickel-rich phase. However, the large isomer shift remains, indicating that the ferrous iron is still present. XRD shows that the phase is now cubic. Annealing up to 650 °C gradually oxidized all of the Fe2+ in the material and restored the magnetic and crystalline properties of the plasma-sprayed coating to very close to those of the unsprayed ferrite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348027
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic-field distributions in zinc-nickel ferrite : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5352-5354 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Mössbauer effect has been used to study the microscopic magnetic properties of the cubic microwave ferrite (Zn0.41Ni0.59)Fe2O4 at 300 K. The magnetically split spectrum is broad and unresolved due to the overlap of the hyperfine magnetic fields at the tetrahedral and octahedral sites. This is caused by a distribution of magnetic fields at each site. The distribution is especially large and asymmetric at the octahedral site and is due to the fact that the iron atoms at this site are influenced by the presence of both iron and zinc at the tetrahedral site. The octahedral site is more sensitive to changes in the number of zinc neighbors than is the tetrahedral site. Assuming a random distribution of the zinc at the tetrahedral site, and knowing the fraction of zinc in the ferrite, the binomial distribution has been used to calculate the expected magnetic-field distribution at the octahedral site as a function of the number of zinc neighbors. These figures have been compared with the magnetic-field distribution profile determined from the fit to the Mössbauer spectrum. Sufficiently good agreement has been found to allow us to isolate the magnetic-field contribution due to most of the different numbers, between zero and six, of neighboring zinc atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348026
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  • 3
    Electronic Resource
    Electronic Resource
    The formation of jets from shaped charges in the presence of asymmetry (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2136-2143 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The jet from a nominally axisymmetric shaped charge is formed by the collapse of the typically conical liner under the high pressures resulting from detonation of the explosive around it. Where asymmetries are present the velocities imparted to the elements of the liner at a given axial distance from the cone tip will vary as a function of the azimuthal angle among other variables. In general these elements will not meet at all. Conversely a pair of liner elements that do meet will in general have started from different axial positions, and will meet away from the nominal axis of symmetry of the charge. This effect renders the formation process asymmetrical. Consequently the jet particles have an off-axis velocity component which can substantially degrade the penetrative capability of the charge. A complete analysis of asymmetrical liner collapse and jet formation is presented for the case where the liner is axisymmetric, but there is an azimuthal variation in liner projection velocity. The classical analysis of symmetric liner collapse and jet formation is extended to include this type of asymmetry. Earlier work on linear shaped charges, particularly a model for asymmetric jet formation, is drawn upon to consider plane sections of the liner individually. A fully three-dimensional analysis is then achieved by the combination of the results for these sections. This analysis is implemented in a computational model and example results are presented and compared in as far as is possible and meaningful with previous theoretical and experimental results. Good agreement with the previous theoretical work is obtained, and the values of the off-axis velocity components predicted are of the orders observed in the limited experimental data as yet available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352329
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  • 4
    Electronic Resource
    Electronic Resource
    The Howard Hughes Medical Institute cassette for storage phosphor plates (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 608-611 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: New cassettes for 201 mm×252 mm (8‘×10‘) and 201 mm×400 mm (8‘×15.75‘) storage phosphor plates have been developed at the Synchrotron Resource of the Howard Hughes Medical Institute. The purpose for this work was mainly twofold. Firstly, to diminish the number of manual operations when putting the storage phosphor plate into the cassette or when extracting it from the cassette. Secondly, to render such a cassette much lighter than the former metal cassette previously in use. These two goals were achieved by making new cassettes that are operated as one piece instead of two or three independent parts as with the former systems. The cassettes have been extensively tested and found to be very useful.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145125
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  • 5
    Electronic Resource
    Electronic Resource
    Mössbauer effect determination of relative recoilless fractions for iron oxides (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 329-332 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The relative recoilless fraction (F-value) of each of six iron oxides, defined as the ratio of the recoil-free fractions of two different materials, was experimentally determined relative to hematite at 300 K and 77 K by Mössbauer spectroscopy. Using the relative recoil-free fractions compared to that of hematite, the relative recoilless fractions between all pairs of the seven iron oxides were determined. The F-values can allow conversion of Mössbauer subspectral areas to the relative atomic, molecular, or weight fractions of each iron oxide present in a mixed oxide phase sample. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369451
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  • 6
    Electronic Resource
    Electronic Resource
    Killed but metabolically active microbes: a new vaccine paradigm for eliciting effector T-cell responses and protective immunity (2005)
    [s.l.] : Nature Publishing Group
    Nature medicine 11 (2005), S. 853-860 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] We developed a new class of vaccines, based on killed but metabolically active (KBMA) bacteria, that simultaneously takes advantage of the potency of live vaccines and the safety of killed vaccines. We removed genes required for nucleotide excision repair (uvrAB), rendering microbial-based vaccines ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm1276
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  • 7
    Electronic Resource
    Electronic Resource
    Compounds containing Mercury – Iron Bonds (1965)
    [s.l.] : Nature Publishing Group
    Nature 205 (1965), S. 589-590 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We find that although the compounds Fe(CO)4Hg2Xa are sufficiently soluble in polar solvents to permit recrystal-lization, they do not give sufficiently concentrated solutions for mol. wt. or dipole moment determination. Their elemental analyses and infra-red spectra (2,200175 cm1) can be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/205589b0
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  • 8
    Electronic Resource
    Electronic Resource
    Infrared emission spectra of candidate interstellar aromatic molecules (1996)
    [s.l.] : Nature Publishing Group
    Nature 380 (1996), S. 227-229 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The unidentified infrared bands (UIRs) are generally associated with interstellar molecular clouds that are subjected to intense ultraviolet and optical radiation6"11; one such example is the Trapezium region of the Orion Nebula, where the massive young stars (such as 01 Orioni C) have ionized the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/380227a0
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  • 9
    Electronic Resource
    Electronic Resource
    Relief in microscopy (1983)
    [s.l.] : Nature Publishing Group
    Nature 306 (1983), S. 428-428 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - The illumination systems and techniques involved in the production of the photomicrographic image are complex and radically different from those encountered in everyday life, and ambiguities and misinterpretations can arise if the brain interprets the apparently simple image in the same way ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/306428b0
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature-dependent interconversion of histamine H 1 and H 2 receptors in guinea pig ileum (1974)
    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 54-55 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During studies of the effects of changes in temperature on the blocking action of some competitive H1 antagonists, we found that below 18 C promethazine ceased to be competitive and appeared to act Bon-oompetitively. Since pro-methazine can act as a non-competitive antagonist of the H2 receptor in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/252054a0
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