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  • 11
    Electronic Resource
    Electronic Resource
    The effects of various cure cycles upon the viability ofBacillus subtilis var.niger spores within solid propellant (1972)
    Springer
    Origins of life and evolution of the biospheres 3 (1972), S. 198-205 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Survivor curves forBacillus subtilis var.Niger spores were determined during cure within à solid propellant containing a saturated hydrocarbon binder. Cure temperatures of 82, 93, 105, and 115°C were selected for evaluation. Upon completion of the propellant mix, samples of approximately 5 g were weighed, placed into aluminum planchets, and subjected to dry heat cure. The results indicated that the survivor curves were polyphasic at all cure temperatures evaluated. The polyphasic nature of the survivor curves reflect the physico-chemical changes occuring during polymerization. Selected portions of each survivor curve were delineated and subjected to linear regression analysis. D values were calculated for selected portions of each survivor curve at each test temperature. Sterility (considering the nature and consistency of the propellant system under investigation, sterility has been defined as no viable particles recovered-N.V.P.R.) was not achieved with samples cured at 82 and 93°C for 7 day. Samples cured at 105°C experienced a four-log reduction in number of spores within 4 h; however, sterility was not achieved by 48-h cure. A temperature of 115°C was necessary to achieve sterility within 12 h. The results indicated that thermally stable binders will permit the sterilization of solid propellant motors during routine cure cycles, prior to terminal sterilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928164
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  • 12
    Electronic Resource
    Electronic Resource
    NMR detected by Mössbauer-effect, applied to the system57CoFe (1974)
    Springer
    The European physical journal 270 (1974), S. 233-237 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The detection of NMR in oriented nuclei via the Mößbauer effect in the daughter state is described and its specific advantages and drawbacks compared to other methods. As an example, the NMR of57Co in Fe was observed in external fields of 0–8 kG. The zero field frequency yields a magnetic momentμ 57/μ n =4.708±0.012. The different value found from the slope of the resonance frequency vs. external field is attributed to a Knight shift of (+2.9±1.2)%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01680415
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  • 13
    Electronic Resource
    Electronic Resource
    Nuclear quadrupole alignment in Zn, Lu, and Re and the quadrupole moments of69m Zn and177m Lu (1983)
    Springer
    The European physical journal 310 (1983), S. 233-241 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report low-temperature nuclear quadrupole alignment of69m Zn,177m, g Lu and186, 188Re in the corresponding metal single crystal hosts. A comparison with data on these systems from other laboratories is given, and sources of systematic error discussed. In the Lu system, measurements on in situ irradiated and implanted samples are found to be in agreement. From the measured quadrupole frequencies, we derive the following quadrupole moments: Q(69m Zn, 13.86 h, 9/2+)=−0.45(7)b,Q(177m Lu, 161 d, 23/2−) =4.23(67)b,Q(186Re, 90h, 1−)=0.57(9)b, andQ(188Re, 16.7h, 1−)=0.38(17)b.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415228
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  • 14
    Electronic Resource
    Electronic Resource
    Critical field for superconductivity and low-temperature normal-state heat capacity of tungsten (1973)
    Springer
    Journal of low temperature physics 12 (1973), S. 499-518 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the critical magnetic field for superconductivity in tungsten from 5.5 to 15 mK using a γ-ray anisotropy thermometer, and we have measured the heat capacity between 0.35 and 25 K. Analysis of the data givesH o =1.237 Oe for the 0 K critical field,T c =16.0 mK for the critical temperature, γ=1.008 mJ/mole · K 2 for the coefficient of the electronic heat capacity, and Θ o =383 K for the 0 K Debye temperature. The measured values of the critical fieldH c are consistently higher than those reported by Black, Johnson, and Wheatley (BJW) on the CMN temperature scale, but the temperature dependence is similar. This discrepancy and the temperature dependence ofH c suggest that both sets ofH c data are affected by magnetic impurities. Use of the calorimetric γ value permits an improved test of the CMN temperature scale with the very-low-temperatureH c data obtained by BJW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654953
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  • 15
    Electronic Resource
    Electronic Resource
    Search for superconductivity in lithium and magnesium (1970)
    Springer
    Journal of low temperature physics 3 (1970), S. 589-602 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent theoretical work suggests that magnesium and lithium should be superconducting in the m°K temperature range. We have cooled samples of each of these metals to a temperature of 4 m°K, measured by a gamma-ray anisotropy thermometer. Although the magnetic field was less than 10−2 Oe, no superconducting transitions were observed. The use of a nuclear orientation thermometer employing60Co in single crystal (hcp) cobalt is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628336
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  • 16
    Electronic Resource
    Electronic Resource
    Nuclear orientation of thermally prepared114mInCu by the brute-force method (1983)
    Springer
    Hyperfine interactions 13 (1983), S. 249-255 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the results of brute-force orientation experiments on several alloys of114mInCu prepared by different thermal methods, with the goal of clarifying the origins of the deviations from the theoretical nuclear orientation effect reported by several groups for this system. In particular, using thin diffused samples we obtain essentially the same attenuation as previously reported for both114mIn and111In implanted into Cu crystals and foils. Thicker diffused or melted samples show less or more attenuation, respectively. We find no evidence for thermal gradients between samples and thermometers as a cause for the observed deviations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01027254
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  • 17
    Electronic Resource
    Electronic Resource
    Nuclear spin-lattice relaxation of dilute Mn in Cu, Ag, and Au (1983)
    Springer
    Hyperfine interactions 16 (1983), S. 585-588 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have developed a new method of determining nuclear spinlattice relaxation times of dilute impurity nuclei in non-magnetic host metals. Direct measurement of these extremely rapid relaxation times has hitherto been difficult. The present method is based on fast pulsed heating of a sample containing oriented radioactive nuclei and is applicable to a wide range of impurity-host combinations and over a large range of applied magnetic fields. Results are presented for extremely dilute Mn in noble metal hosts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02147321
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  • 18
    Electronic Resource
    Electronic Resource
    Nuclear resonance studies of95NbFe (1977)
    Springer
    Hyperfine interactions 3 (1977), S. 321-338 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dilute alloys of 35-day95Nb in polycrystalline iron have been studied by nuclear magnetic resonance on oriented nuclei (NMR/ON) using frequency modulation and fast passage techniques. Comparison of resonance frequencies with nuclear orientation results confirms the spin 9/2 for the95Nb ground state. The zero-field resonance frequency is 275.29(9) MHz, leading to ag-factor of 1.3653(25) if the hyperfine field from spin-echo measurements on93NbFe is used. Relaxation times, line shapes, and the frequencyversus field behavior are discussed. A summary of data for CoFe alloys, used here for calibration purposes, is also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021563
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  • 19
    Electronic Resource
    Electronic Resource
    Nuclear orientation of AgMn alloys (1978)
    Springer
    Hyperfine interactions 4 (1978), S. 415-419 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021863
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  • 20
    Electronic Resource
    Electronic Resource
    Nuclear orientation of48V in Fe and Co and NMR of48VFe (1980)
    Springer
    Hyperfine interactions 8 (1980), S. 59-70 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of the anisotropies of the 984 and 1312 keV γ-rays from48VFe and48VCo in fields up to 4 T and temperatures down to 4 mK show extremely long nuclear spin-lattice relaxation times (3–4 h in Fe, 8 h in Co host) and indicate negative hyperfine fields in both hosts. The Fe measurements show a magnetic moment for the48V 4+ ground state considerably larger than previously reported. This is confirmed by NO/NMR of48VFe, giving μ(4+)=2.012(11) μN. The advantages of pulsed NMR techniques, especially in systems with slow relaxation, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026858
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