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  • 11
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of rigid-rod star-block copolymers of a varying number of arms (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 1373-1376 
    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/ma00031a001
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  • 12
    Electronic Resource
    Electronic Resource
    Solvent evaporation induced torsad texture of sheared liquid-crystalline polymers (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 4942-4947 
    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/ma00017a034
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  • 13
    Electronic Resource
    Electronic Resource
    Interaction of enriched CO2 and water stress on the physiology of and biomass production in sweet potato grown in open-top chambers (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 13 (1990), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. The objective of this study was to investigate the effects of water stress in sweet potato (Ipomoea batatas L. [Lam] ‘Georgia Jet’) on biomass production and plant-water relationships in an enriched CO2 atmosphere. Plants were grown in pots containing sandy loam soil (Typic Paleudult) at two concentrations of elevated CO2 and two water regimes in open-top field chambers. During the first 12 d of water stress, leaf xylem potentials were higher in plants grown in a CO2 concentration of 438 and 666 μmol mol−1 than in plants grown at 364 μmol mol−1. The 364 μmol mol−1 CO2 grown plants had to be rewatered 2 d earlier than the high CO2-grown plants in response to water stress. For plants grown under water stress, the yield of storage roots and root: shoot ratio were greater at high CO2 than at 364 μmol mol−1; the increase, however, was not linear with increasing CO2 concentrations. In well-watered plants, biomass production and storage root yield increased at elevated CO2, and these were greater as compared to water-stressed plants grown at the same CO2 concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1990.tb01983.x
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  • 14
    Electronic Resource
    Electronic Resource
    Generation of synthetic seismograms with layer reduction (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 111 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The surface motion in a plane multilayered half-space has been considered. Layer matrices of SH and P-SV motions are written as sums of matrices. Using these it is seen that when shear wave velocity of a layer, say the lth, is greater than the phase velocity, and layer thickness is large compared to wavelength, the surface motion can be written with the lth layer as the terminating half-space. Thus in computation of surface motion, the depth of the terminating half-space in a given structure depends on phase velocity and frequency. Further, if the source is below the terminating half-space, it has no contribution to surface motion at that phase velocity and frequency for which the terminating half-space has been obtained. This layer reduction formulation is applied in the generation of synthetic seismograms. As this generation requires computation over large ranges of phase velocity and frequency, the present method is important in avoiding excess computation time for unnecessary layers and in avoiding overflow due to the above mentioned lth layer. The method is most useful in low phase velocity and high frequency ranges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb00556.x
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  • 15
    Electronic Resource
    Electronic Resource
    Polymerization of acrylamide initiated by Ce4+/L-cysteine redox system (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 954-959 
    Details
    ISSN: 1435-1536
    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: Summary The polymerization of acrylamide initiated by Ce 44+/L-cysteine redox system has been studied at 35 ± 0.2 °C in dark under nitrogen atmosphere. The effect of monomer,L-cysteine, Ce4+ and sulphuric acid concentration and temperature on the rate of polymerization has been studied. The rate may be expressed by the following equation:R p α[M] [Ce4+]0.5 [Cysteine]0.44 The overall energy of activation is 4.78 kcal/deg/mole in the investigated range of temperature 30–50 °C. Molecular weight of the polymer is independent of catalyst concentration but increases with increasing monomer concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01584927
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  • 16
    Electronic Resource
    Electronic Resource
    Rheological study of black coal-oil suspensions (1984)
    Springer
    Rheologica acta 23 (1984), S. 195-206 
    Details
    ISSN: 1435-1528
    Keywords: Black coal ; oil ; suspension ; ageing ; power-law model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The rheological study of coal-oil suspensions is very important because of their application in many industries as alternative fuels to petroleum oil. In this work, the flow behaviour of black coal-oil suspension was studied for a range of coal volume fractions from 0.0378 to 0.427. Shear stresses were measured for shear rates up to 200 s−1 using a Weissenberg Rheogoniometer. All the suspensions behaved like non-Newtonian liquids and exhibited significant increases in apparent viscosity on storage. The flow behaviour of both freshly prepared and aged suspensions was able to be described by power-law models. A model similar to that given by Chong was used to establish relation between the relative apparent viscosity and coal volume fraction for freshly prepared as well as all aged suspensions. A correlation was also established between ageing time and maximum coal volume fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332075
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  • 17
    Electronic Resource
    Electronic Resource
    Hydration behavior of mixed ligand chromium complexes. Part I: partial molar volumes and partial molar adiabatic compressibilities of oxalato and mixed oxalato — Ethylxanthato chromate(III) complexes (1992)
    Springer
    Journal of solution chemistry 21 (1992), S. 699-710 
    Details
    ISSN: 1572-8927
    Keywords: Partial molar volume and adiabatic compressibility ; hydration number ; potassium ethylxanthate ; dioxalato ethylxanthato chromate ion ; K[Cr(ox)2(H2O)2] ; K3[Cr(ox)3] ; K2[Cr(ox)2SSCOC2H5]
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Densities and ultrasonic velocities in aqueous solutions of cis-K[Cr(ox)2(H2O)2], K3[Cr(ox)3] and KSSCOC2H5 and a mixed ligand complex K2[Cr(ox)2SSCOC2H5], where SSCOC2H5 is the ethylxanthate ligand, have been measured at 25, 35 and 45°C. Limiting partial molar volumes, partial molar adiabatic compressibilities and hydration numbers of the complex salts as well as of the ligand have been calculated. The implication of the findings are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650762
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  • 18
    Electronic Resource
    Electronic Resource
    The imaginary part of the nucleon-nucleus optical potential (1983)
    Springer
    The European physical journal 313 (1983), S. 99-103 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Volume integrals of the imaginary part of the proton and the neutron optical potentials obtained from the existing phenomenological analyses for the mass number range of 12–209 and for a range of nucleon energies (E p =10–180 MeV,E n =8–150 MeV) have been fitted with an empirical expression. The isoscalar, the isovector and the Coulomb components determined empirically have been compared with those obtained from the microscopic approach. Though there is qualitative agreement between the two predictions, there are differences when compared quantitatively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02115847
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  • 19
    Electronic Resource
    Electronic Resource
    Ising model on self-avoiding walk chains (1984)
    Springer
    The European physical journal 57 (1984), S. 151-155 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phase transitions of nearest-neighbour interacting Ising models on self-avoiding walk (SAW) chains on square and triangular lattices have been studied using Monte Carlo technique. To estimate the transition temperature (T c) bounds, the average number of nearest-neighbours (Z eff) of spins on SAWs have been determined using the computer simulation results, and the percolation thresholds (p c) for site dilution on SAWs have been determined using Monte Carlo methods. We find, for SAWs on square and triangular lattices respectively,Z eff=2.330 and 3.005 (which compare very well with our previous theoretically estimated values) andp c=0.022±0.003 and 0.045±0.005. When put in Bethe-Peierls approximations, the above values ofZ eff givekT c/J〈1.06 and 1.65 for Ising models on SAWs on square and triangular lattices respectively, while, using the semi-empirical relation connecting the Ising modelT c's andp c's for the same lattices, we findkT c/J≳0.57 and 0.78 for the respective models. Using the computer simulation results for the shortest connecting path lengths in SAWs on both kinds of lattices, and integrating the spin correlations on them, we find the susceptibility exponent γ=1.024±0.007, for the model on SAWs on two dimensional lattices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02071965
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  • 20
    Electronic Resource
    Electronic Resource
    Phenomenological analysis of intermediate mass fragments emission in alpha induced reactions (1993)
    Springer
    The European physical journal 346 (1993), S. 281-284 
    Details
    ISSN: 1434-601X
    Keywords: 25.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Intermediate mass fragment emission in α induced reactions on Al and Ti at 60 and 104 MeV, respectively has been analysed using phenomenological moving source model. Fragment emission at backward angles is found to be well explained by a single fusion-like source, whereas for forward angles an additional intermediate velocity source is required to explain the data. The relative contribution of the intermediate velocity source decreases sharply with angle for lower energies and it extends significantly to larger angles in the higher energy reaction. The fractional momentum transfer for the fusion-like source is in agreement with the corresponding Viola systematics value in the case of α+Al reaction, whereas for α+Ti reaction, it is larger than that obtained from the Viola systematics. The degree of incompleteness (in momentum transfer) is found to be fragment dependent; incompleteness being more for lighter fragments and vice-versa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292518
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