Showing papers in "Physica D: Nonlinear Phenomena in 1963"

TL;DR: In this article, the problems of unitarity, causality and renormalizability are treated in a field theory containing an unstable particle, and the S -matrix constructed with these propagators and connecting stable particle states only is shown to be unitary, renormalizable and causal.

TL;DR: In this article, it was shown that the Born-Green-Yvon and Kirkwood integral equations can be embedded in exact equations by using the appropriate form of an exact relationship between the three-particle distribution function and g(r) of a classical fluid.

TL;DR: In this article, the authors review and extend the explanation of the resistivity anomalies observed in certain magnetic metals and alloys in terms of spin-dependent scattering of the conduction electrons, for this purpose, the usual theory of electrical conductivity has been extended to include inelastic collisions with and without spin flip.

TL;DR: In this paper, the authors examined the thermal diffusion data of Moran and Watson for Kr and Xe, determined with a Trennschaukel as a function of temperature, and found that the experimental values were consistently smaller than the calculated theoretical values.

TL;DR: In this paper, the enumeration of complete selfavoiding walks on a lattice, or close-packed polymer configurations, is discussed and it is shown that if the lines along which the walks proceed are directed (one-way) lines, and the graph formed by the lattice points and these lines is the covering graph of a closed graph, the number of Hamilton walks can be expressed in terms of a determinant and hence calculated explicitly.

TL;DR: In this paper, the principle of minimum entropy production is applied to obtain bounds on the diffusion coefficient of a solute in a suspension of solid particles, as well as on the viscosity of the suspension.

TL;DR: In this article, the viscosity of argon, carbon dioxide, helium, neon and nitrogen in the range of temperatures 25 −270°C and pressures 1 −150 atm.

TL;DR: In this article, the authors examined l’energie rayonnee in fonction of the pression de mercure, de la pression d’argon and du courant electrique.

TL;DR: In this article, the thermal conductivity coefficient λ of compressed argon has been measured with a parallel plate method described previously, and the experimental data for λ and η are confronted with the values predicted from the theory of Enskog.

TL;DR: In this article, the results of eleven isotherms between 90°K and 148°K for argon and fourteen for methane were calculated in two regions for each liquid for comparison with the vapour tension curves established by different authors.

TL;DR: In this article, the crystal statistics of the Ising model diamond lattice were investigated by series methods and the specific heat and spontaneous magnetisation were estimated within narrow limits. But the results were limited to the case where the crystal lattice has low temperature expansions that converge up to the Curie point and the spontaneous magnetization vanishes as Tc − T h where h = 0.312 ± 0.002.

TL;DR: In this article, the specific heat and susceptibility of two ferromagnetic copper compounds have been measured between 0.04 and 1.5°K and the transition temperatures Tc as derived from both specific heat versus temperature curves are in excellent agreement with the theory of spin waves, as formulated by Dyson.

TL;DR: In this article, the thermodynamic theory for viscosity and plasticity phenomena, given by the author in some previous papers, is further developed and a rather general Theological equation is derived from which the rheological equations for Poynting-Thomson, Jeffreys, Maxwell, Kelvin, Hooke, Newton, Prandtl-Reuss, and Bingham media may be considered as degeneracies.

TL;DR: In this paper, a relatively simple expression for the thermal diffusion factor αij(tern) of two components i and j of a ternary mixture was derived, which is the equivalent to the first Chapman-Cowling approximation.

TL;DR: In this article, the authors described the details and results of a precise, absolute determination of the viscosity of argon-helium mixtures at 20°C and at 30°C, both from 1 to 50 atm pressure.

TL;DR: In this paper, the relationship between the master equation derived by L. Van Hove and by I. Prigogine and the author is analyzed, and it is shown that the difference between the two approaches essentially lies in a different definition of the irreducible contributions defining the transition probabilities.

TL;DR: In this paper, the α-particle yield from proton bombardment of 23 Na, 27 Al, 31 P, and 35,37 Cl was investigated in the energy range E p = 200 − 850 keV.

TL;DR: In this article, the half-lives of the first excited states of some even-even nuclei have been measured by means of the delayed coincidence method and the results are: Nucleus Half-life of first excited state 102RU (1.22 ± 0.20) ± 10−11 s 126Xe (4.13± 0.14) × 10− 11 s 196Hg(1.732 ±0.037)× 10−9 s

TL;DR: In this paper, Hartshorn bridge measurements at low temperatures on dysprosium and ytterbium ethylsulphate are presented and discussed, showing that the spin-lattice relaxation times in DyES are in good agreement with those from other authors and, above 1.7°K, with Orbach's theory for the two-phonon resonance process.

TL;DR: In this paper, the volume contraction on mixing has been measured for binary mixtures of normal alkanes in the range between n −C 6 H 14 and n -C 62 H 126 for temperatures from 51°C up to 126°C.

TL;DR: In this article, the eigenvalue problem of the exponential time decay of a thermal neutron distribution is investigated and it is shown that the decay constant is bounded whenever the neutron transit time is unbounded.

TL;DR: In this paper, the simultaneous absorption of two r.f. quanta has been observed in the electron resonance spectrum of phenanthrene in its lowest triplet (phosphorescent) state.

TL;DR: In this article, the Yang-Lee distribution of roots for two examples of repulsive potentials, viz. one-dimensional hard rods and weak long range repulsion, is calculated.

TL;DR: In this article, the authors measured the optical excitation function of the line spectrum of a line of helium atoms with a beam of electrons of adjustable velocity in helium, and the beam current was low (10 − 50 μA) and the helium pressure was also low (about 5 × 10−3 Torr).

TL;DR: In this paper, the determinant elements which occur in the Chapman-Cowling second approximation formula for the viscosity of binary gas mixtures have been evaluated, and preliminary calculations indicate that the contribution of the second approximation is about 1% but deserves consideration in view of the high precision attainable in viscoity measurements.

TL;DR: In this paper, a theory of freezing was developed from the point of view of molecular field theory, which neglects the enhancement of fluctuations before f reezing, and the value for the freezing point at fixed density is: kTF = −v(G) HS.

TL;DR: In this paper, the wave function for a vector boson in a Coulomb field is obtained in a high energy approximation, and the Furry wave function is extended by taking into account a term hitherto neglected.

TL;DR: In this article, one hundred and twenty resonances have been found in the reaction 26Mg(p, γ) 27Al with protons in the energy range Ep = 0.2-3.0 MeV.

TL;DR: In this article, experimental results on thermal diffusion in mixtures of two isotopes with one nonisotopic component are compared with the theory developed in paper I10) and the agreement between theory and experiment is satisfactory.