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  • Articles  (28)
  • Springer  (28)
  • Molecular Diversity Preservation International
  • Taylor & Francis
  • 1985-1989  (28)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (28)
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  • Articles  (28)
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  • 1
    Electronic Resource
    Electronic Resource
    The initiation process in the polymerization of N-vinylcarbazole and 3-1,9-N-vinylcarbazole by trityl salts (1989)
    Springer
    Polymer bulletin 22 (1989), S. 163-167 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The initiation mechanism in the cationic polymerization of N-vinylcarbazole and 3-I,9-N-vinylcarbazole by trityl salts in nitrobenzene, methylene chloride and chlorobenzene has been studied. Spectroscopic studies and molecular weight analysis show that the polymerization mechanism depend on the used solvent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255207
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  • 2
    Electronic Resource
    Electronic Resource
    An estimation of the chain branching effects in butene/ethylene copolymers from microhardness measurements (1989)
    Springer
    Polymer bulletin 21 (1989), S. 513-516 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this work a simple microhardness test to evaluate the degree of chain braching in butene-ethylene copolymers is proposed. The random introduction into the chain of co-units, reduces the level of crystallinity in the copolymer, a characteristic easily measurable through indentation experiments. A comparative study between density and microhardness values in samples with different concentration of chain braching is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271975
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  • 3
    Electronic Resource
    Electronic Resource
    Electrophoretic behaviour of calcium oxalate monohydrate in liquid mixtures (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 941-947 
    Details
    ISSN: 1435-1536
    Keywords: Electrophoretic mobility ; calcium oxalate monohydrate ; liquid mixture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An experimental investigation on electrophoresis of calcium oxalate monohydrate in several liquid mixtures (methanol-, ethanol-, 2-propanol-, and methanol-acetonewater) is described. The electrophoretic transport is considered from the view-point of the Thermodynamics of Irreversible Processes. Linear relations have always been found between the mass flux and the applied electric field. The ζ-potential of the interface C.O.M./liquid mixture has been estimated by using the classial theory of electrophoretic mobility of colloidal particles. The influence of the composition of the mixture on the electrophoretic coefficient has been discussed on the basis of the variation of ζ-potential, viscosity and dielectric constant with the molar fraction of alcohol for binary mixtures and acetone for ternary mixtures. The concentration dependence of the electrophoretic coefficient is found to be linear only in the latter case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01469634
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  • 4
    Electronic Resource
    Electronic Resource
    On the electrophoretic mobility and zeta potential of montmorillonite in non-aqueous media (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 435-438 
    Details
    ISSN: 1435-1536
    Keywords: Electrophoresis ; montmorillonite ; zeta potential ; double layer thickness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Experimental results on the electrophoretic velocity and mobility of Ca-montmorillonite in 2-propanol are reported. The variation of the electrophoretic velocity with the externally applied electric field and the particle size range, at constant volume fraction and temperature, is considered. Given the difficulties for determining the types and concentrations of ions present in these liquid media, two methods are discussed for the estimation of the double layer thickness and hence the productκα, necessary for the determination of the zeta potential (ζ) of the interface. Although both methods of calculation yield different values ofκα, the results for the zeta potential are very similar in the regions ofκα andζ characteristic of our systems. The application to the experimental data of three theoretical relations between electrophoretic mobility and zeta potential is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419547
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrogen sulphide doping of GaAs and AlxGa1−xAs grown by molecular beam epitaxy (MBE) (1985)
    Springer
    Applied physics 36 (1985), S. 147-151 
    Details
    ISSN: 1432-0630
    Keywords: 68.55 ; 73.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract H2S gas has been used during molecular beam epitaxy (MBE) growth of GaAs and Al x Ga1−x As as sulphur vector forn-type doping. Doping efficiencies are less than 10−3 at usual growth temperatures, and are limited by an incorporation competitive surface process, probably 2Ga+H2S→Ga2S+H2. In AlxGa1−x As forx≧0.2 the doping efficiency is further reduced by carrier freeze-out at deep levels. Measured thermal activation energies depend on growth conditions and remain relatively low even up to the direct-indirect bandgap crossover for substrate temperatures in the 585–645
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624935
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  • 6
    Electronic Resource
    Electronic Resource
    Atomic layer molecular beam epitaxy growth of InAs on GaAs substrates (1989)
    Springer
    Applied physics 49 (1989), S. 543-545 
    Details
    ISSN: 1432-0630
    Keywords: 68.55.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract InAs layers with thickness ranging from 0.1 to 2.5 μm have been grown directly on highly mismatched (7.4%) (001) GaAs substrates by atomic layer molecular beam epitaxy (ALMBE). This growth method, based on the modulated deposition of one or both component species, provides InAs layers with excellent flat morphology, independently of the total thickness. A detailed study of the evolution of the electron diffraction (RHEED) pattern indicates that a complete decoupling between the InAs epitaxial layer and the GaAs substrate is reached in less that 10 monolayers. Evidence is obtained that layer-by-layer nucleation takes place from the beginning of the growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617022
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  • 7
    Electronic Resource
    Electronic Resource
    Silicon migration during MBE growth of doped (A1, Ga)As films (1986)
    Springer
    Applied physics 41 (1986), S. 237-241 
    Details
    ISSN: 1432-0630
    Keywords: 68.55 ; 66.30J
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Silicon migration during MBE growth of (Al, Ga)As and (Al, Ga)As/GaAs or AlAs/GaAs superlattices has been studied by electrochemical C-V and secondary ion mass spectrometry (SIMS) concentration-depth profiling. It is found to be concentration dependent, with no preferential migration towards or away from the growth front. At high concentrations, superlattice disordering during growth is observed using photovoltage and transmission electron microscopy (TEM) techniques. On the basis of C-V, SIMS and TEM data we propose that silicon migration occurs as the result of a concentration-dependent diffusion process. This is substantiated by measurements of the two-dimensional electron-gas mobility in selectively doped heterojunctions as a function of growth temperature and silicon concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616845
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  • 8
    Electronic Resource
    Electronic Resource
    Atomic layer molecular beam epitaxy (Almbe) of III–V compounds: Growth modes and applications (1989)
    Springer
    Applied physics 49 (1989), S. 729-737 
    Details
    ISSN: 1432-0630
    Keywords: 68.55.+ b ; 82.40.Dm ; 61.14.Hg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A new development of molecular beam epitaxy (MBE) for III–V compounds is described, based on cyclic perturbation of the growth front at atomic layer level by periodic pulsing, alternating or interrupting the molecular beams. The modification of the growth mechanism caused by this perturbations is discussed and related to periodic changes of surface stoichiometry which induce 2D growth mechanism by enhanced layer nucleation. Under appropriate modulation conditions, an atomic layer by layer growth mode can be achieved. A practical implementention of this mode, that we denote atomic layer MBE (ALMBE), is considered in which only group V beams are pulsed in a specially designed effusion cell. A number of growth applications of ALMBE are presented, including growth of highly mismatched heterostructures and short period superlattices containing two different group V elements such as arsenic and phosphorous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617001
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  • 9
    Electronic Resource
    Electronic Resource
    Simple method to estimate nitride and nitrogen contents in self-shielded FCAW weld metal (1987)
    Springer
    Journal of materials science 6 (1987), S. 111-112 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729448
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  • 10
    Electronic Resource
    Electronic Resource
    Phase separation in Li2O-SiO2 glasses with additions of V2O5, MnO2 and Cr2O3 (1988)
    Springer
    Journal of materials science 23 (1988), S. 2512-2516 
    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 A number of lithium silicate glasses, inside and just outside the miscibility gap, containing low percentages of V2O5, MnO2 and Cr2O3 were examined by electron microscopy techniques. Upon heat treatment in the range 450 to 550° C these glasses exhibited phase separation preceding extensive crystallization. The Li2O contents (mol%) of the base glass compositions were: 26 (C-I), 30 (C-II), 34 (C-III) and 37 (C-IV). The V2O5 and MnO2 additions were 1 mol% and the Cr2O3 addition was 0.1 mol%. Globular or sectorized domains were obtained for compositions C-I to C-III containing V2O5, for formulations C-II to C-IV containing Cr2O3 and for glass C-I containing MnO2. In nearly every case a much finer liquid-phase separation of droplet type was also detected. The results indicate that V2O5 and MnO2 widen the Li2O-SiO2 miscibility gap and that the Cr2O3 may cause fine-scale crystallization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01111910
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