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  • 1
    Electronic Resource
    Electronic Resource
    Recherche statistique paramétrique du rapport résistance-indice sclérométrique: essai de définition de la classe des bétons (1985)
    Springer
    Materials and structures 18 (1985), S. 67-73 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Summary In this research an analysis is made of the strength-sclerometric index correlations in respect to the most common parameters which characterize the concrete and which are easy to identify during test on the finished structure. It is shown that the type of aggregate, the type of cement and the curing time have an effect on the results. The analysis was undertaken on 2583 standard cubes examined at the official laboratory of the University of Rome. With the statistical study it is possible to determine ten regressive functions and the related curves, each of which is associated with the coefficients to determine the dispersion coefficient of the given data. The analysis indicates that reference to one curve alone is not reliable because the different parameters of the concrete exert non-negligible influence on the sclerometer impact response. The authors propose an evaluation of the characteristic strength of the concrete by using the curves mentioned, also considering the data scatter, standard deviation from the series of measurements taken and the equivalence coefficient between conventional and in-situ strength.
    Notes: Résumé Dans cette recherche on analyse les corrélations résistance-indice sclérométrique, par rapport aux paramètres les plus communs qui caractérisent l'agglomérat et qui sont faciles à identifier au cours des essais sur les structures finies. On a mis en évidence le type de granulat, le type de ciment, la durée de vieillissement. L'analyse a été effectuée sur 2583 cubes standard, examinés au Laboratoire Officiel de l'Université de Rome. La recherche statistique a permis de déterminer 10 fonctions de régression et les courbes relatives; à chacune de ces courbes ont été associés le coefficient de détermination et le coefficient de dispersion des données. L'analyse a montré qu'on ne peut se fier à une seule courbe de corrélation étant donné que les différents paramètres du béton ont une influence non négligeable sur la réponse sclérométrique. Les auteurs proposent même une évaluation de la résistance caractéristique de l'agglomérat au moyen des courbes déjà indiquées en tenant aussi compte des coefficients de dispersion des données, de l'écart-type de la série de mesures effectuées, et encore du coefficient d'équivalence entre la résistance conventionnelle et la résistancein situ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02473366
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  • 2
    Electronic Resource
    Electronic Resource
    Using laser micro mass spectrometry with the LAMMA-1000 instrument for monitoring relative elemental concentrations in vitrinite (1988)
    Springer
    Microchimica acta 96 (1988), S. 105-118 
    Details
    ISSN: 1436-5073
    Keywords: LAMMS ; LAMM A ; coal ; vitrinite ; elemental concentration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The variation in relative elemental concentrations among a series of coal macerals belonging to the vitrinite maceral group was determined using laser micro mass spectrometry (LAMMS). Variations in Ba, Cr, Ga, Sr, Ti, and V concentrations among the coals were determined using the LAMM A-1000 instrument. LAMMS analysis is not limited to these elements; their selection illustrates the application of the technique. Ba, Cr, Ga, Sr, Ti, and V have minimal site-to-site variance in the vitrinite macerals of the studied coals as measured by LAMMS. The LAMMS data were compared with bulk elemental data obtained by instrumental neutron activation analysis (INAA) and D. C. arc optical emission spectroscopy (DCAS) in order to determine the reliability of the LAMMS data. The complex nature of the ionization phenomena in LAMMS and the lack of standards characterized on a microscale makes obtaining quantitative elemental data within the ionization microvolume difficult; however, we demonstrate that the relative variation of an element among vitrinites from different coal beds in the eastern United States can be observed using LAMMS in a “bulk” mode by accumulating signal intensities over several microareas of each vitrinite. Our studies indicate gross changes (greater than a factor of 2 to 5 depending on the element) can be monitored when the elemental concentration is significantly above the detection limit. “Bulk” mode analysis was conducted to evaluate the accuracy of future elemental LAMMS microanalyses. The primary advantage of LAMMS is the inherent spatial resolution, ~ 20μm for coal. Two different vitrite bands in the Lower Bakerstown coal bed (CLB-1) were analyzed. The analysis did not establish any certain concentration differences in Ba, Cr, Ga, Sr, Ti, and V between the two bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01236096
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  • 3
    Electronic Resource
    Electronic Resource
    Quality control of the cure process of thermosetting resins by means of differential scanning calorimetry (1985)
    Springer
    Journal of thermal analysis and calorimetry 30 (1985), S. 1349-1357 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die kalorimetrische und rheologische Charakterisierung der Ansätze von hitzhärtbarem Harz wird beschrieben. Die Ansätze enthalten ein mit 60–120% methyliertem Maleinsäure-Adduktanhydrid gehärtetes Novolackepoxidharz. Die kalorimetrisch bestimmte Epoxid-konversion wurde auf die theoretisch aus der nicht-linearen Flory'schen Kopolymerisationstheorie berechneten und experimentell durch rheologische Tests bestätigten Erstarrungsgrenzen bezogen.
    Abstract: Резюме Описаны калориметри ческие и реологическ ие характеристики терм ореактивных резин, содержащих нов олак-эпокси резину со вместно с ангидридом метилиро ванной малеиновой кислоты в качестве от вердителя. Превращен ие эпокси-резины, опреде ленное калориметрич еским методом, взаимосвяза но с пределами гелеоб разования, вычисленных по теори и Флори для нелинейной копол имеризации и экспери ментально подтвержденных в рео логических испытаниях.
    Notes: Abstract Calorimetric and rheological characterizations of thermosetting resin formulations containing a novalac epoxy resin hardened with 60 to 120 parts per hundred of methylated maleic acid adduct anhydride are described. The calorimetrically determined epoxy conversion has been related to the gelation limits theoretically calculated from Flory's non-linear copolymerization theory and experimentally verified in rheological tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914306
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  • 4
    Electronic Resource
    Electronic Resource
    Hypomethylation of repair patches in HeLa cells (1985)
    Springer
    Molecular biology reports 10 (1985), S. 177-182 
    Details
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In HeLa cells, under conditions where normal semiconservative synthesis is suppressed by hydroxyurea, the excision repair process after irradiation by UV results in a small amount of incorporation of nucleotides into nonreplicated DNA. By labelling the cytosine moieties of these repair patches, and measuring the ratio between cytosine and 5-methylcytosine, we have found that the level of methylation of cytosine in repair patches five hours after UV-irradiation of the cells is about half of that observed in normal semiconservatively synthesized DNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00778526
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  • 5
    Electronic Resource
    Electronic Resource
    Stable crack growth, instability, fatigue and fracture of a 50/50 blend of poly(2,6-dimethyl-1,4-phenylene oxide) and polystyrene (1989)
    Springer
    Journal of materials science 24 (1989), S. 2221-2230 
    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 The fracture behaviour of a 50/50 blend of poly(2,6-dimethyl-1,4-phenylene oxide)/poly-styrene has been studied. The crack propagation behaviour is strongly influenced by the temperature, crack driving force and the nature of the crack tip craze zone. A fracture map outlining the regions of stable crack growth as a function of temperature, crack velocity and crack driving force has been determined. At high temperatures and low crack growth velocities, stable crack propagation proceeds through a single-craze crack tip damage zone, while at lower temperatures and high crack velocities, a multiple-craze crack tip zone is observed. Corresponding behaviour can be observed under fatigue loading conditions. An instability leading to very high-speed fracture occurs at a critical crack velocity, thus limiting the stable crack propagation regime to lower velocities. The various reported measures of fracture toughness, such as those based on crack initiation, peak load and the onset of crack instability, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385445
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  • 6
    Electronic Resource
    Electronic Resource
    Inversion and deletion mutants in Bacillus subtilis bacteriophage SPP1 as a consequence of cloning (1985)
    Springer
    Molecular genetics and genomics 198 (1985), S. 537-539 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Properties of an inversion and a deletion mutant of B. subtilis phage SPP1 which arose during cloning are described. The results are related to the biology of this bacteriophage. In preceding communications from our laboratories (Heilmann and Reeve 1982, Behrens et al. 1983) we reported the properties of genetically engineered SPP1 bacteriophages, which could be used as cloning vehicles in B. subtilis. These phages contain a unique restriction site within a dispensable region of their genomes. In the course of cloning experiments using these phage vectors, we have occasionally observed the appearance of not only the original vector and desired hybrid phages, but also of SPP1 phages which had undergone extensive genomic rearrangements. Properties of two such phages, SPP1 inv1, which was found to contain a large inversion and of SPP1 delV, a deletion mutant, which defines an additional dispensable region of the SPP1 genome, are described in this communication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332954
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  • 7
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    Hypomethylation of repair patches in HeLa cells (1985)
    Springer
    Details
    Publication Date: 1985-04-01
    Print ISSN: 0301-4851
    Electronic ISSN: 1573-4978
    Topics: Biology
    Published by Springer
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  • 8
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    Using laser micro mass spectrometry with the LAMMA-1000 instrument for monitoring relative elemental concentrations in vitrinite (1988)
    Springer
    Details
    Publication Date: 1988-01-01
    Print ISSN: 0026-3672
    Electronic ISSN: 1436-5073
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 9
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    Stable crack growth, instability, fatigue and fracture of a 50/50 blend of poly(2,6-dimethyl-1,4-phenylene oxide) and polystyrene (1989)
    Springer
    Details
    Publication Date: 1989-06-01
    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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