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  • 1
    Electronic Resource
    Electronic Resource
    Enthalpy relaxation in polymer glasses: evaluation and interpretation of the Tool-Narayanaswamy parameter x for poly(vinyl chloride) (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 1084-1089 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00029a012
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  • 2
    Electronic Resource
    Electronic Resource
    The National Institute of Standards and Technology glow discharge resonance ionization mass spectrometry system (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 509-515 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new resonance ionization mass spectrometry system at the National Institute of Standards and Technology using glow discharge atomization and continuous-wave lasers has been developed. Low concentrations of 133Cs in a silver matrix have been measured using this new system. In addition a detailed characterization of the glow discharge source and laser ionization processes are made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150252
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  • 3
    Electronic Resource
    Electronic Resource
    Iron-57 NMR: relaxation mechanisms and chemical shifts (1984)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 106 (1984), S. 2444-2446 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00320a042
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  • 4
    Electronic Resource
    Electronic Resource
    An auditory guide to the extradural space (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 29 (1974), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1974.tb00773.x
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  • 5
    Electronic Resource
    Electronic Resource
    Microstress mechanism for the time dependence of the modulus of crystalline polymers following an imposed change in volume (1974)
    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 295-296 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is known that in polycrystalline solids with anisotropic thermal expansion coefficients, a change in temperature produces profound changes in both the plastic properties of the solid and the creep compliance2-6. This effect is attributed to the thermally induced generation of microstresses. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/252295a0
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  • 6
    Electronic Resource
    Electronic Resource
    The application of modulated differential scanning calorimetry to the glass transition (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 103-115 
    Details
    ISSN: 1572-8943
    Keywords: glass transition ; MDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The modulated differential scanning calorimetry (MDSC) technique superimposes upon the conventional DSC heating rate a sinusoidally varying modulation. The result of this modulation of the heating rate is a periodically varying heat flow, which can be analysed in various ways. In particular, MDSC yields two components (‘reversing’ and ‘non reversing’) of the heat flow, and a phase angle. These each show a characteristic behaviour in the glass transition region, but their interpretation has hitherto been unclear. The present work clarifies this situation by a theoretical analysis of the technique of MDSC, which introduces a kinetic response of the glass in the transition region. This analysis is able to describe all the usual features observed by MDSC in the glass transition region. In addition, the model is also able to predict the effects of the modulation variables, and some of these are discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01982690
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  • 7
    Electronic Resource
    Electronic Resource
    The use of DSC to characterize structural relaxation in thermosetting polymers (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 79-85 
    Details
    ISSN: 1572-8943
    Keywords: cross-linking degree ; DSC ; enthalpy relaxation ; epoxy resins ; physical aging ; reactive diluent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Structural relaxation in different epoxy-anhydride and epoxy-diamine resins has been investigated by differential scanning calorimetry using annealing and cooling rate experiments. The annealing experiments lead to the determination of enthalpy loss,δH, at an equivalent annealing temperatureT a=T g-20, and for periods of annealing time, ta, between 1 h and 4 months. The variation ofδH with logta, defines a relaxation rate per decade,rrpd, which is very sensitive to changes of the epoxy network. The cooling rate experiments allow the determination of the apparent activation energy,δh *. The effect of the degree of crosslinking, the addition of a reactive diluent, which acts as flexibilizer, and the length of cross-link onrrpd and δh* was studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987423
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  • 8
    Electronic Resource
    Electronic Resource
    Heterozygous diploids ofPenicillium Chrysogenum and their segregation patterns (1965)
    Springer
    Genetica 36 (1965), S. 378-397 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several heterozygous diploids were made between genetically labelled derivatives of two strains ofPenicillium chrysogenum which produced relatively large amounts of penicillin and were of divergent lineage. The derivatives were labelled with spore colour and nutritional mutations. The diploids, although uniform in having wild type spore colour and being prototrophic, ranged from types having penicillin yields close to that of the original parents to types having less than a quarter of this titre level. Intermediate types had titre levels of about half to threequarters that of the high yielding diploids. Segregants were selected which had arisen naturally and also after nitrogen mustard treatment; most had the spore colour and auxotrophic phenotype of one or other immediate parent. From diploids of low and intermediate titre only haploid segregants with the genetical markers of one parent could be recovered with intact penicillin yield; haploids with the genetic markers of the other showed a marked reduction in yield. However, from diploids of high yield, both parental types could be recovered showing no loss of their original penicillin yield. The bearing of these results is discussed on the suggestion that different degrees of homozygosity between diploids may account for the titre variation observed. An alternative suggestion that mutations suppressive to penicillin titre might cause such variation is also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01557170
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  • 9
    Electronic Resource
    Electronic Resource
    Properties of heterozygous diploids between strains ofPenicillium chrysogenum selected for high penicillin yield (1964)
    Springer
    Antonie van Leeuwenhoek 30 (1964), S. 209-224 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three strains ofPenicillium chrysogenum selected for high penicillin yield and of independent lineage were marked with suitable genetical characters prior to the synthesis of several heterozygous diploids. These parental strains had domestic codes, C, D and Y. Two diploids, between differently labelled mutants of strain C and Y, produced similar amounts of penicillin to strain C, which was less than that produced by strain Y. Previous work had indicated that genes responsible for increased penicillin yield were recessive and the present results suggested that such genes in strains C and Y were allelic, apart from the presence of one or more additional recessive mutations leading to greater penicillin production in the higher yielding parent. Three diploids made between mutants of strains D and Y were lower in penicillin yield than either original parent and only in the case of one diploid compared with one of the parental strains was this difference not significant. In strains D and Y, therefore, there may have been some recessive genes concerned with increasing penicillin yield which were non-allelic. However, no first order segregants arising spontaneously or subsequent to X-ray treatment produced higher levels of penicillin than the better yielding original parent in any cross.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02046727
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  • 10
    Electronic Resource
    Electronic Resource
    A bone ash standard for90Sr,210Pb,210Po, uranium and the actinides (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 177 (1994), S. 5-18 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A bone ash standard for a number of radionuclides is required as a quality control sample in dosimetry studies with bone as the critical organ. The procedures that were used to prepare a candidate bone ash standard are given with some initial encouraging measurements that the candidate sample will meet the requirements of NIST standard reference manual.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02132406
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