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  • 1
    Electronic Resource
    Electronic Resource
    Ternary Systems with Ammonium Nitrate and Guanidine Nitrate. (1949)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 53 (1949), S. 1009-1015 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150472a003
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  • 2
    Electronic Resource
    Electronic Resource
    The X-ray/Gamma-ray Spectrometer on the Near Earth Asteroid Rendezvous Mission (1997)
    Springer
    Space science reviews 82 (1997), S. 169-216 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An X-ray/gamma-ray spectrometer has been developed as part of a rendezvous mission with the near-Earth asteroid, 433 Eros, in an effort to answer fundamental questions about the nature and origin of asteroids and comets. During about 10 months of orbital operations commencing in early 1999, the X-ray/Gamma-ray Spectrometer will develop global maps of the elemental composition of the surface of Eros. The instrument remotely senses characteristic X-ray and gamma-ray emissions to determine composition. Solar excited X-ray fluorescence in the 1 to 10 keV range will be used to measure the surface abundances of Mg, Al, Si, Ca, Ti, and Fe with spatial resolutions down to 2 km. Gamma-ray emissions in the 0.1 to 10 MeV range will be used to measure cosmic-ray excited elements O, Si, Fe, H and naturally radioactive elements K, Th, U to surface depths on the order of 10 cm. The X-ray spectrometer consists of three gas-filled proportional counters with a collimated field of view of 5° and an energy resolution of 850 eV @ 5.9 keV. Two sunward looking X-ray detectors monitor the incident solar flux, one of which is the first flight of a new, miniature solid-state detector which achieves 600 eV resolution @ 5.9 keV. The gamma-ray spectrometer consists of a NaI(Tl) scintillator situated within a Bismuth Germanate (BGO) cup, which provides both active and passive shielding to confine the field of view and eliminate the need for a massive and costly boom. New coincidence techniques enable recovery of single and double escape events in the central detector. The NaI(Tl) and BGO detectors achieve energy resolutions of 8.7% and 14%, respectively @ 0.662 MeV. A data processing unit based on an RTX2010 microprocessor provides the spacecraft interface and produces 256-channel spectra for X-ray detectors and 1024-channel spectra for the raw, coincident, and anti-coincident gamma-ray modes. This paper presents a detailed overview of the X-ray/Gamma-ray Spectrometer and describes the science objectives, measurement objectives, instrument design, and shows some results from early in-flight data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005052720796
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  • 3
    Electronic Resource
    Electronic Resource
    The origin of selected lunar geochemical anomalies: Implications for early volcanism and the formation of light plains (1985)
    Springer
    Earth, moon and planets 32 (1985), S. 257-273 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The Apollo orbital geochemistry, photogeologic, and other remote sensing data sets were used to identify and characterize geochemical anomalies on the eastern limb and farside of the Moon and to investigate the processes responsible for their formation. The anomalies are located in the following regions: (1) Balmer basin, (2) terrain northeast of Mare Smythii, (3) near Langemak crater, (4) Pasteur crater, (5) terrain northwest of Milne basin, (6) northeast of Mendeleev basin, (7) north and northeast of Korolev basin, (8) terrain north of Taruntius crater, and (9) terrain north of Orientale basin. The anomalies are commonly associated with Imbrian- or Nectarian-aged light plains units which exhibit dark-haloed impact craters. The results of recent spectral reflectance studies of dark-haloed impact craters plus consideration of the surface chemistry of the anomalies strongly indicate that those geochemical anomalies associated with light plains deposits which display dark-haloed impact craters result from the presence of basaltic units that are either covered by varying thickness of highland debris or have a surface contaminated with significant amounts of highlands material. The burial or contamination of ancient volcanic surfaces by varying amounts of highland material appears to have been an important (though not the dominant) process in the formation of lunar light plains. Basaltic volcanism on the eastern limb and farside of the Moon was more extensive in both space and time than has been accepted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054216
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  • 4
    Electronic Resource
    Electronic Resource
    The relationship between geology and geochemistry in the Undarum/Spumans/Balmer region of the Moon (1987)
    Springer
    Earth, moon and planets 38 (1987), S. 97-112 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A detailed study of geochemical variation in the Undarum/Spumans/Balmer region identifies major rock components which form the region's regolith. The northern portion of the region contains numerous small mare deposits, which cluster in the Undarum and Spumans areas particularly. In the southern portion of the region lies the Balmer basin chemical anomaly, which correlates with extensive plains deposits. Regional maps of the orbital geochemical variables (Mg, Al, Fe, Ti, and Th) are examined individually, then correlated to one another and to the most recent geological map of the region. Results of the study indicate the presence of basalt components, which show considerable variation in character and which are correlated with both mare and plains features in a region otherwise dominated by ANT suite material. The northeastern area is the most characteristically anorthositic part of the region and mare plains deposits from this area have relatively anorthositic composition. A basalt intermediate in composition between mare basalt and Fra Mauro basalt is proposed as a probable component of the Balmer plains deposits. Southeastern Crisium basalts, and the parts of other mare deposits that are distributed along a structurally-related ring have a similar character. The major basalt deposits around the eastern part of Fecunditatis appear to have a different character. All deposits, particularly those in the northeastern area, appear to be mare basalt contiminated with ANT suite material from the surrounding highlands. In general, the surface geochemistry of the Undarum/Spumans/Balmer region is quite heterogeneous, showing a distinct north/south dichotomy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00119678
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  • 5
    Electronic Resource
    Electronic Resource
    Mössbauer study of Fe-Cr-Co magnetic alloys (1978)
    Springer
    Journal of materials science 13 (1978), S. 155-166 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Mössbauer spectroscopy has been used to investigate the hyperfine fields in an Fe-27.5% Cr-17.5% Co-0.5% Al alloy for different heat treatments. Spectra for the as-cast condition consist of two superimposed 6 line spectra and a central peak and reveal the three distinct iron environments ofα 1,α 2, andγ phases respectively. Following homogenization a broad distribution of hyperfine fields associated with broad isomer shift distribution is indicative of randomized atomic distribution within a single phase. Upon isothermal heat treatment at 620° C theα phase spinodally decomposes into 2 ferromagnetic environments: a Fe-Co richα 1 phase withH eff ≈ 350 kOe and a Cr-richα 2 phase withH eff ≈ 200 kOe. Evidence of a third ferromagnetic iron rich environment (α 3 phase withH eff ≈ 325 kOe) is also found as a transition phase which forms prior to subsequent ageing. The progressive reduction in ageing temperature from 600 to 540° C to improve coercivity transforms theα 1 andα 2 modulated structure into a paramagnetic Cr-rich precipitate giving a single line spectrum and a highly ferromagnetic Fe-Co rich matrix givingH eff ≈ 350 kOe. Anisotropy of the Fe-Co matrix introduced by isothermal decomposition under the influence of the external magnetic field is clearly observable after the ageing process through changes to the Mössbauer spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00739286
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  • 6
    Electronic Resource
    Electronic Resource
    Applications of Mössbauer spectroscopy to the coals of Central Queensland (1988)
    Springer
    Hyperfine interactions 41 (1988), S. 839-841 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The importance of mineral deposits in coal has been appreciated for some time especially in the subsequent processing of coal after it has been mined. In this paper use has been made of iron-57 Mossbauer spectroscopy at room temperature to analyse black coals from the Central Queensland area. The key components of these spectra are the sulphates and sulphides of iron. The components of these spectra are modified upon heat treatment up to 150°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02400521
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  • 7
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    Ternary Systems with Ammonium Nitrate and Guanidine Nitrate. (1949)
    American Chemical Society
    Details
    Publication Date: 1949-07-01
    Print ISSN: 0022-3654
    Electronic ISSN: 1541-5740
    Topics: Chemistry and Pharmacology , Physics
    Published by American Chemical Society
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  • 8
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    M�ssbauer study of Fe-Cr-Co magnetic alloys (1978)
    Springer
    Details
    Publication Date: 1978-01-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 9
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    A computer program for plotting nmr spectra (1972)
    American Chemical Society
    Details
    Publication Date: 1972-05-01
    Print ISSN: 0021-9584
    Electronic ISSN: 1938-1328
    Topics: Chemistry and Pharmacology , Education
    Published by American Chemical Society
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  • 10
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    The relationship between geology and geochemistry in the Undarum/Spumans/Balmer region of the Moon (1987)
    Springer
    Details
    Publication Date: 1987-06-01
    Print ISSN: 0167-9295
    Electronic ISSN: 1573-0794
    Topics: Geosciences , Physics
    Published by Springer
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