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  • Articles  (46)
  • viscosity  (24)
  • phase transition  (22)
  • Springer  (46)
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  • American Geophysical Union
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  • 2000-2004  (33)
  • 1970-1974  (13)
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  • Physics  (42)
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  • Articles  (46)
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  • Springer  (46)
  • American Chemical Society
  • American Geophysical Union
  • EDP Sciences
  • Emerald
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  • 1
    Electronic Resource
    Electronic Resource
    Rheology of Lyocell Solutions from Different Cellulose Sources (2000)
    Springer
    Journal of polymers and the environment 8 (2000), S. 151-154 
    Details
    ISSN: 1572-8900
    Keywords: Lyocell ; cellulose ; rheology ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Rheological measurements were used to characterize the behavior of lyocell solutions, i.e., cellulose dissolved in N-methymorpholine-N-oxide. Cellulose sources included dissolving pulp, kraft pulp, sugar cane fibers, and kenaf fibers. The dominance of viscous behavior, G′ values, over elastic behavior, G″ values, is affected by cellulose concentration and molecular weight. At lower concentrations and degrees of polymerization (DP), dissolving pulp solutions show viscous, inelastic behavior at low frequencies. At higher concentration and DP, dissolving pulp solutions are more elastic at higher frequencies. Solutions prepared with kenaf and sugar cane fibers show similar properties to those using pure dissolving pulp, and comparisons suggest the molecular weight and/or the presence of other substances such as lignin in the cellulose from these alternative sources affect the rheology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1014881901010
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Starch Granule Size on Viscosity of Starch-Filled Poly(hydroxy ester ether) Composites (2000)
    Springer
    Journal of polymers and the environment 8 (2000), S. 145-150 
    Details
    ISSN: 1572-8900
    Keywords: Starch ; particle size ; composite ; viscosity ; polyester
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of starch granule size on the viscosity of starch-filled poly(hydroxy ester ether) (PHEE) composites was characterized using size-fractionated potato starch, as well as unfractionated starches (rice, corn, wheat, and potato). Potato starch was separated using an air classifier into four particle size fractions: 〈18 μm, 18-24 μm, 24-30 μm, and 〉30 μm. The starch was dried to a moisture content of 0.5% to minimize moisture effects on composite rheology. PHEE and potato starch were extruded with starch volume fractions of 0.46 and 0.66. Stress relaxation, frequency and strain sweep, and temperature-dependence measurements were carried out. Although small variations in viscosity were seen with the different potato starch fractions, differences were not significant at a volume fraction of 0.46. Viscosity differences between the different particle size fractions were more pronounced at a volume fraction of 0.66. The temperature dependence could be described by an Arrhenius relation, with an apparent activation energy of 84 kJ/mole. At a volume fraction of 0.46, the starch/PHEE viscosities increased in the order potato starch 〈 wheat starch ≃ corn starch 〈 rice starch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1014829916940
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  • 3
    Electronic Resource
    Electronic Resource
    Ferromagnetism in the single-band Hubbard model: An exact high-temperature expansion (1974)
    Springer
    Journal of statistical physics 11 (1974), S. 159-167 
    Details
    ISSN: 1572-9613
    Keywords: Hubbard model ; ferromagnetism ; high-temperature expansion ; phase transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The first ten terms of the high-temperature expansion of the susceptibility of the single-band Hubbard model in the strong correlation limit are obtained for arbitrary electron density. The series is analyzed by ratio methods and Padé approximants. A critical temperature is found for 0.2 ⩽ρ ⩽ 0.8; forρ 〉 1 further terms in the series are required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012517
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  • 4
    Electronic Resource
    Electronic Resource
    Bose-Einstein condensation in one- and two-dimensional gases (1974)
    Springer
    Journal of statistical physics 10 (1974), S. 299-319 
    Details
    ISSN: 1572-9613
    Keywords: Bose-Einstein condensation ; phase transition ; helium thin films ; one-dimensional systems ; two-dimensional systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that the one- and two-dimensional ideal Bose gases undergo a phase transition if the temperature is lowered at constant pressure. At the pressure-dependent transition temperature Tc (P) and in their thermodynamic limit the specific heat at constant pressure cp and the particle densityn diverge, the entropyS and specific heat at constant volumec v fall off sharply but continuously to zero, and the fraction of particles in the ground state N0/N jumps discontinuously from zero to one. This Bose-Einstein condensation provides a remarkable example of a transition which has most of the properties of a second-order phase transition, except that the order parameter is discontinuous. The nature of the condensed state is described in the large but finiteN regime, and the width of the transition region is estimated. The effects of interactions in real one- and two-dimensional Bose systems and recent experiments on submonolayer helium films are discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012253
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  • 5
    Electronic Resource
    Electronic Resource
    Phase transition of hard hexagons on a triangular lattice (1973)
    Springer
    Journal of statistical physics 9 (1973), S. 23-44 
    Details
    ISSN: 1572-9613
    Keywords: Lattice gas ; phase transition ; Peierls' argument
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Systems of hard hexagons on a triangular lattice are investigated. The orientation of the hexagons is kept fixed, while the size of the hexagons is varied. The existence of a phase transition is proved for all sizes by means of the Peierls'argument. The proof does not imply a phase transition in the continuous limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01016795
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  • 6
    Electronic Resource
    Electronic Resource
    Discrete Symmetry Breaking for Certain Short-Range Interactions (2000)
    Springer
    Journal of statistical physics 98 (2000), S. 1049-1061 
    Details
    ISSN: 1572-9613
    Keywords: Gibbs measure ; phase transition ; lattice spin system ; discrete symmetry breaking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Georgii's theorem ensures that, restricted to two-dimensional planes, a single ocean (i.e., infinite connected component) of a ground state and islands (i.e., finite connected components) are observed in lattice spin systems at sufficiently low temperature. This paper extends his results for higher dimensional hyperplanes. Our proof is mainly based on a kind of Peierls argument and is different from Georgii's, which relies on the percolation method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018607526690
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of density fluctuations on the equation of state (1974)
    Springer
    Journal of statistical physics 10 (1974), S. 471-484 
    Details
    ISSN: 1572-9613
    Keywords: Equation of state ; internal virial ; density fluctuations ; mean-square fluctuation ; probability ; probability distribution function ; phase transition ; isotherm ; critical region
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of inhomogeneity of particle density on the equation of state has been considered in the approximation of homogeneous fluctuations. The formula for the relative mean square fluctuation has been derived taking into account intermolecular interaction. It has been shown that the density fluctuations cannot be neglected near the coexistence curve. This curve has been obtained without recourse to the Maxwell construction; unphysical parts of the van der Waals isotherms in fact never appear in the theory. Experimental parameters have not been used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020402
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  • 8
    Electronic Resource
    Electronic Resource
    Lattice models for hydrogen-bonded solvents (1972)
    Springer
    Journal of statistical physics 4 (1972), S. 15-41 
    Details
    ISSN: 1572-9613
    Keywords: Polymer ; hydrogen bond ; phase transition ; zeros of partition function ; lattice model ; binary mixture ; ice-rule ferroelectric
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A class of lattice models for a binary mixture is defined by assuming that one of the components may form bonds to neighboring molecules of the same species. It is assumed that the fugacity of a molecule depends on the number of bonds which connect the molecule to other molecules. If no molecule is allowed to be connected by more than two bonds to other molecules, then no phase transition occurs, while phase transition can occur if more than two bonds are allowed. If only two or no bonds are allowed, then the model can be solved rigorously for certain planar lattices by transforming it to a dimer covering problem; this model shows behavior similar to the Ising model in zero magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008469
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  • 9
    Electronic Resource
    Electronic Resource
    Phenomenological equations for multicomponent fluids (1972)
    Springer
    Journal of statistical physics 5 (1972), S. 113-125 
    Details
    ISSN: 1572-9613
    Keywords: Nonequilibrium thermodynamics ; electrolyte solution ; high-temperature plasma ; state variable ; forces and fluxes ; nonlocal linear relation ; Onsager reciprocity ; hydrodynamic equation of motion for component ; Navier-Stokes equation ; diffusion ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ahydrodynamic equation of motion for each component of a multicomponent fluid is derived on the basis of nonequilibrium thermodynamics. Special care has been directed to the choice of state variables. In some limiting cases, this equation leads to customary phenomenological equations, such as the equation for diffusion and the Navier-Stokes equation. The viscosity is a consequence of nonlocal coupling of forces and fluxes. The reciprocity between the linear coefficients is examined closely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008374
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  • 10
    Electronic Resource
    Electronic Resource
    The correlation function in Wilson's theory of phase transitions: Above and below the transition (1973)
    Springer
    Journal of statistical physics 9 (1973), S. 317-329 
    Details
    ISSN: 1572-9613
    Keywords: Correlation function ; ɛ-expansion ; ordered state ; phase transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The correlation function and the correlation length are discussed in the theoretical framework of the Wilson-Feynman diagram expansion for small ε=4−d. It is shown explicitly that to order ε2 the scaling relation γ= ν(2−η) is satisfied and that the correlation function is a homogeneous function ofk and ξ. The explicit form of the scaled correlation function is exhibited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012164
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