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  • 2020-2021
  • 1980-1984  (46)
  • 1970-1974
  • 1984  (30)
  • 1982  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Sulfazecin analogs. Preparation of 4-fluoromethyl-1-sulfo-2-azetidinone derivatives (1984)
    s.l. : American Chemical Society
    The @journal of organic chemistry 49 (1984), S. 1427-1430 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00182a021
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  • 2
    Electronic Resource
    Electronic Resource
    Penicillin-binding proteins in Mycobacterium smegmatis (1984)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 25 (1984), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The penicillin-binding proteins (PBPs) of Mycobacterium smegmatis were studied. Five PBPs ranging in Mr from approx. 114000 to 25000 were detected in the cytoplasmic membrane. The affinities of the PBPs for selected β-lactam antibiotics were determined. Most of the antibiotics bound to PBPs 3 and 4 at low concentrations. A penicillin-susceptible mutant and a cefmetazole-resistant mutant were isolated by selection in vitro. The PBPs of these mutants were identical to those of the parent strain. The affinity of cefmetazole for the individual PBPs was identical in each mutant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1984.tb01477.x
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  • 3
    Electronic Resource
    Electronic Resource
    Holomorphic projective structures on compact complex surfaces. II (1984)
    Springer
    Mathematische Annalen 255 (1984), S. 519-521 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01451931
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  • 4
    Electronic Resource
    Electronic Resource
    Tensile fracture of centre-notched angle ply (0/±45/0)S and (0/90)2S graphite — epoxy composites (1982)
    Springer
    Journal of materials science 17 (1982), S. 417-428 
    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 centre-notched (0/± 45/0)S and (0/90)2S laminates with increasing notch length has been studied. Two test series have been investigated: specimens of constant width (W=20 mm) and small notch length (2a ⩽ 12 mm), and specimens with various notch lengths (5 ⩽ 2a ⩽ 35 mm) and a constant relative notch length (2a/W=0.5). An X-ray technique showed that the damage at the notch tip, which is formed at increasing load, consists mainly of subcracks parallel to the fibres of the constituent layers. The damage zone causes the crack opening displacement (COD) to deviate from the original linearity. TheK R curve concept has been applied assuming that the COD deviation from linearity is completely the result of original crack extension. This approach fails to describe the notch length effect, because a tangent point between theK R andK curves was not found and because of a strong dependency of the maximum fracture resistanceK Rmax on notch length. The fracture behaviour of 20 mm wide specimens could be explained with the point and average stress criteria, based on characteristic lengths which are independent of notch length. At various notch lengths at a constant 2a/W=0.5, however, the characteristic lengths increased with increasing notch length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00591477
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and mechanical properties of a Fe90Zr10 amorphous alloy (1984)
    Springer
    Journal of materials science 19 (1984), S. 1917-1929 
    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 structure of a Fe90Zr10 amorphous alloy was investigated by means of small angle X-ray scattering as well as large-angle diffraction measurements. For as-quenched specimens, SAXS was found to be relatively weak, but spread over a wide scattering angle. After quantitative analysis, it was concluded that a compositional fluctuation occurs on a fine scale of about 0.6 nm. When the specimen was heat treated below the crystallization temperature, the amorphous structure changed to a more stable dual structure consisting of pure iron and a structure similar to Fe3Zr. By prolonged heat treatment, the iron-rich regions crystallized initially from the amorphous state. An apparent correspondence was found to exist between the changes in the amorphous structure and in the mechanical properties. The microscopic phase separation within the amorphous state resulted in an increase of ultimate tensile strength and fracture toughness. The deterioration of mechanical properties was suggested to be attributed to the gradual crystallization of iron-rich regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550262
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  • 6
    Electronic Resource
    Electronic Resource
    Quark-gluon plasma formation in the central rapidity region and finite size effects of colliding nuclei (1984)
    Springer
    The European physical journal 23 (1984), S. 391-403 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energy density of the central products in the ultra-relativistic heavy ion collisions are calculated. In our estimation, the special attention is paid to the space-time extension of the emission points of the secondary hadrons which are originate in the successive nucleon-nucleon interactions within the finite size of colliding nuclei. The average collision number per produced particle, in the final state interaction, is also calculated and is used as a criterion whether the system is thermalized or not. It turns out that the attainable energy density in the central heavy ion collision is sensitive to the spacetime extension of the emission points. However, if the incident energy and the mass numbers of colliding nuclei are high and large, we can get high enough energy density for the phase transition from a hadronic state to a quark-gluon plasma state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01572664
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  • 7
    Electronic Resource
    Electronic Resource
    Inclusive production ofK s 0 , K s 0 K s 0 andK *±(892) in $$\bar pp$$ interactions at 3.0, 3.5, 4.0 and 4.5 GeV/c (1984)
    Springer
    The European physical journal 23 (1984), S. 369-375 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract InclusiveK s 0 andK s 0 K s 0 production in $$\bar pp$$ interactions at 3.0, 3.5, 4.0 and 4.5 GeV/c are studied. Cross sections ofK s 0 , K s 0 K s 0 andK *±(892) are presented for each incident momentum. The production ofK s 0 andK *±(892) through annihilation process is investigated. It is found that the annihilation process is dominant but decreases with incident momentum. The annihilation process is compared withe + e − interactions. Remarkable similarity between them is found in the $${{x_0 = 2E(K_s^0 )} \mathord{\left/ {\vphantom {{x_0 = 2E(K_s^0 )} {\sqrt s }}} \right. \kern-\nulldelimiterspace} {\sqrt s }}$$ distribution. Events with two detectedK s 0 's are analyzed. The result shows theK s 0 K s 0 pairs are produced in the central region of c.m. system and there is a clearS * signal in theK s 0 K s 0 effective mass distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01572662
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  • 8
    Electronic Resource
    Electronic Resource
    Inclusive Λ production in $$\bar p$$ p interactions at 3.0, 3.5, 4.0 and 4.5 GeV/c (1984)
    Springer
    The European physical journal 24 (1984), S. 297-304 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Inclusive Λ production in $$\bar p$$ p interactions at 3.0, 3.5, 4.0 and 4.5 GeV/c is studied. The inclusive cross sections for Λ and Λ $$\bar \Lambda $$ production are measured. The differential cross sections as functions ofx, y, andP T 2 are given for each beam momentum. It is found that the contribution of indirect production of Λ from resonance decay is considerably enhanced in the region of higher missing mass against Λ. The negative polarization is observed for Λ with largerP T and lower missing mass, and is found to be mainly from two body reactions. Inclusive cross sections for∑ ±(1385) production and the fraction of indirect Λ from∑ ±(1385) decay are measured. The ratio between the cross sections for∑ +(1385) and∑ −(1385) productions is found to be almost constant for wide range of beam momenta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410368
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of notch length, specimen thickness, ply thickness and type of defect on the fracture behaviour of angle-ply graphite-epoxy composites (1982)
    Springer
    Journal of materials science 17 (1982), S. 2324-2336 
    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 An experimental study was carried out on the effects of notch length, specimen thickness, ply thickness and type of defect (centre-notch or hole) on the fracture toughness of graphite-epoxy composites with lay-up sequences of 0/±45°/0 and 0/90°. Three fracture-mechanical concepts were applied: the Waddoups-Eisenmann-Kaminski (WEK) model, the Whitney-Nuismer model (point and average stress cirteria) and the K R-curve method. An increase of notch length as well as an increase of ply thickness led to a higher toughness, whereas a change in specimen thickness did not noticeably affect the toughness. Furthermore, the hole caused a smaller strength reduction than a notch. The applicability of the above-mentioned concepts is probably restricted mainly because of the fact that they do not, or do only insufficiently, regard the damage zone near the border of the defect, if a large damage zone usually leads to larger material parameters of the investigated concepts, namely the inherent flaw size, the characteristic lengths of the point and average stress criterions and the K R -value at fracture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543741
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  • 10
    Electronic Resource
    Electronic Resource
    Viscosity behavior of the polyelectrolyte poly(vinyl alcohol) having some intrachain crosslinks (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 167-172 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The viscosity behavior of aqueous poly(vinyl alcohol) (PVA)-borax-NaCl systems was investigated. The intrinsic viscosity [η] of PVA in borax solution increases with increasing borax concentration. In solutions containing both borax and NaCl, on the other hand, [η] decreases with increasing concentration of NaCl, and at high NaCl concentration phase separation is observed. In the absence of borax, [η] is nearly independent of the NaCl concentration. These results are interpreted in terms of a limited chain expansion due to charges and intrachain crosslinks simultaneously introduced in the PVA chain when the chain is complexed with negatively charged tetrahedral borate ions. The crosslinking density was estimated from the intrinsic viscosity [η]∞ at infinite ionic strength using the Kuhn and Majer equation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850115
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