Search Results - (Author, Cooperation:E. Fried)
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Publication Date: 2014-04-25Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Clinical Trials as Topic/*methods ; Humans ; *National Institute of Mental Health (U.S.) ; Neurobiology/*methods ; Psychiatry/*methodsPublished by: -
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ISSN: 0167-2789Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
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ISSN: 0167-2789Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: PhysicsType of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsNotes: Abstract This paper gives characterisations of properties of varieties such as congruence-distributivity (CD), filtrality (FI), CD and having complemented principal congruences — these last two properties are shown to be equivalent- and having restricted equationally definable principal congruences (REDPC), in terms of the existence of some kind of polynomials. These are generalisations both of Jónsson's famous theorem characterizing CD as well as results concerning the (dual) discriminator. The methods are applied to show that REDPC implies CD, which was a problem asked in [2]. A generalisation of the concept of the Mal'cev condition — the so called Pixley-condition — is defined, and it is shown that filtrality and REDPC are Pixley-conditions. The relations between several concepts connected with the above ones are also investigated. The definitions can be found in section 2, and the results are contained in section 4, section 5, and section 6. We call attention to the figure at the end of the paper, which contains most of our results and gives a survey of the concepts examined.Type of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsType of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsType of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsNotes: Abstract In this paper we introduce a lattice construction, calledmultipasting, which is a common generalization of gluing, pasting, andS-glued sums. We give a Characterization Theorem which generalizes results for earlier constructions. Multipasting is too general to prove the analogues of many known results. Therefore, we investigate in some detail three special cases: strong multipasting, multipasting of convex sublattices, and multipasting with the Interpolation Property.Type of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsType of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsType of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsType of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsType of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsNotes: Abstract For every algebraU there is an algebraU * with (up to isomorphism) the same endomorphism, subalgebra and congruence structure as that ofU, for which every finitely generated subalgebra and every finitely generated congruence ofU * is singly generated. The theorem is proved in a somewhat more general category theoretic context.Type of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Source: Springer Online Journal Archives 1860-2000Topics: MathematicsType of Medium: Electronic ResourceURL: -
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ISSN: 1420-8911Keywords: Key words and phrases: Cover preserving, Distributive lattices, Subdirect Products.Source: Springer Online Journal Archives 1860-2000Topics: MathematicsNotes: Abstract. In this paper we investigate the Cover-Preserving-Embedding-Property, for finite distributive lattices with respect to the variety of modular lattices and give a sufficient condition.Type of Medium: Electronic ResourceURL: -
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ISSN: 1432-0959Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract This investigation is directed toward understanding the role of coupled mechanical and thermal effects in the linear stability of an isothermal antiplane shear motion which involves a steadily propagatingnormal planar phase boundary in anon-elliptic thermoelastic material. When the relevant process is static — so that the phase boundary does not move prior to the imposition of the disturbance —it is shown to be linearly stable. However, when the process involves a moving phase boundary it may be linearly unstable. Various conditions sufficient to guarantee the linear instability of the process are obtained. These depend on the monotonicity of thekinetic response function — a constitutively supplied entity which relates thedriving traction acting on a phase boundary to the local absolute temperature and the normal velocity of the phase boundary-and, in certain cases, on the spectrum of wave-numbers associated with the perturbation to which the process is subjected. Inertia is found to play an insignificant role in the qualitative features of the aforementioned sufficient conditions. It is shown, in particular, that instability can arise even when the normal velocity of the phase boundary is an increasing function of the driving traction if the temperature dependence in the kinetic response function is of a suitable nature. The instability which is present in this setting occurs only in thelong waves of the Fourier decomposition of the moving phase boundary, implying that the interface prefers to be highly wrinkled.Type of Medium: Electronic ResourceURL: -
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ISSN: 1432-0959Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract. An Eulerian expression for the dissipation due to a moving surface of discontinuity in mass density, velocity, stress, energy, and heat flux is obtained. This leads to Eulerian measures for energy release and friction– measures that are work conjugate to mass flux and velocity slip, respectively. Constitutive equations involving these quantities are proposed as a means to determine transition kinetics in materials that change phase.Type of Medium: Electronic ResourceURL: -
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ISSN: 1432-0959Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract An Eulerian expression for the dissipation due to a moving surface of discontinuity in mass density, velocity, stress, energy, and heat flux is obtained. This leads to Eulerian measures forenergy release andfriction — measures that are work conjugate tomass flux andvelocity slip, respectively. Constitutive equations involving these quantities are proposed as a means to determine transition kinetics in materials that change phase.Type of Medium: Electronic ResourceURL: -
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ISSN: 1432-0959Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: We obtain an expression for the energy dissipation due to an evolving nonmaterial interface across which the mass density, velocity, stress, energy density, heat flux, entropy density, and temperature may be discontinuous. This expression is a sum of three terms: the product of the interfacial mass flux with the interfacial energy release; the scalar product of the interfacial velocity slip with the interfacial friction; and, the product of the interfacial temperature jump, scaled by the interfacial temperature average, with the interfacial heating. When the surface in question is a phase interface, we propose, on the basis of the interfacial dissipation inequality, supplemental relations that determine the interfacial energy release, the interfacial friction, and the interfacial heating constitutively as functions of the interfacial mass flux, the interfacial velocity slip, and the scaled interfacial temperature jump. As a step toward an understanding of the role that such interfacial relations may serve in theories for phase transitions, we investigate a problem involving the solidification of a pure substance in the absence of flow.Type of Medium: Electronic ResourceURL: -
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ISSN: 0044-2275Keywords: Key words. Solute transport, convection and diffusion, Smoluchowski equation.Source: Springer Online Journal Archives 1860-2000Topics: MathematicsPhysicsNotes: Abstract. A generalized continuum framework for the theory of solute transport in fluids is proposed and systematically developed. This framework rests on the introduction of a generic force balance for the solute, a balance distinct from the macroscopic momentum balance associated with the mixture. Special forms of such a force balance have been proposed and used going back at least as far as Nernst's 1888 theory of diffusion. Under certain circumstances, this force balance yields a Fickian constitutive relation for the diffusive solute flux, and, in conjunction with the solute mass balance, provides a generalized Smoluchowski equation for the mass fraction. Our format furnishes a systematic procedure for generalizing convection-diffusion models of solute transport, allowing for constitutive nonlinearities, external forces acting on the diffusing constituents, and coupling between convection and diffusion.Type of Medium: Electronic ResourceURL: -
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ISSN: 1588-2632Source: Springer Online Journal Archives 1860-2000Topics: MathematicsType of Medium: Electronic ResourceURL: