Showing papers in "Physica D: Nonlinear Phenomena in 1937"

TL;DR: In this article, the London-v.d. interaction between two spherical particles is computed as a function of the diameters and the distance separating them, and a table is calculated which enables numerical application of the formulae derived.

TL;DR: In this article, the second virial coefficient B (T) was extended by taking into account the influence of Bose or Fermi statistics and of discrete quantum states (existence of polarization molecules, § 3).

TL;DR: In this paper, a discussion is given of Mayer's theory of the condensation phenomenon, which is not restricted to classical statistical mechanics, nor that it is necessary to assume the additivity property of the intermolecular forces.

TL;DR: In this paper, the authors determine the quantites γ (nombre d'electrons supplementaires sortant de la cathode a la suite du choc d'un ion positif) and V (une correction a ajouter a la tension d'amorcage, calculee avec les valeurs de, α et γ).

TL;DR: In this paper, a manometer for low gas pressures, especially between 10−5 and 10−8 mm, consisting of a glow discharge tube in a magnetic field, is described.

TL;DR: In this paper, ausammenfassung auf Grund des Sommerfei d-Bloch'schen Metallmodells ergeben sich bei tiefen Temperaturen grosse Unterschiede zwischen der spezifischen Warme der Elektronen eines unendlich grossen Metalles and derjenigen kleiner Metallteilchen.

TL;DR: The crystal structure of the hexagonal ethylsulphates of the rare earthes La, Ce, Pr, Nd, Sm, Gd, Dy and yttrium was investigated with X-rays as discussed by the authors.

TL;DR: In this article, a simple method, due to Kramers, of approximate evaluation of the partition function (Zustandssumme) in the case when kT > ¦ J ¦ (J = the exchange integral), but μH/kT arbitrary, is explained and applied to discuss some questions related to ferromagnetism (J > 0) and to the adiabatic demagnetization experiments at low temperatures.

TL;DR: In this article, a method for the determination of the refractive index of compressed gases was given for measurements on CO 2 up to 2400 Atm. at 25°, 32°, 50° and 100°C, and λ = 6678, 5876, 5016, 4922, 4713 and 4471 a

TL;DR: In this paper, the density of energy levels ρ(E) of a nucleus has been extended for the case of equidistant individual energy levels and the influence of the incompleteness of the degeneration is investigated.

TL;DR: In this paper, the probabilite qu'un electron and an atome de neon excite produit pendant sa vie un ion d'argon is calculated. But, the probability of collision entre electron and atome of neon is not aprobable.

TL;DR: In this article, a discharge tube was described for the excitation of neutrons by bombardment of a (Zr-D)-target with D 2 -ions, which was used as ion-source, at a pressure of only 10 −3 mm (and a potential difference of a few kV), so that no pumping is needed between the ion source and the part of the tube where the ions are accelerated.

TL;DR: In this article, a liquid diffraction ring with an angle of deviation of 28° (CuKα-rays) was found for liquid helium I at 2.5°K and 1.6°K, which corresponds to the formula one of us and De Smedt found valid for substances with simple spherical molecules.

TL;DR: In this article, folgende Umwandlungs-temperaturen wurden gefunden: CH4 CH3D CD4 α⇒β 20, 4° 15,5° 21,4° abs α ⇒ β - 22, 6° 26,3° abs 4-6 Fur CH4 stimmen die statistisch und die kalorisch ermittelte Entropieen innerhalb der Fehlergrenzen uberein.

TL;DR: In this article, the influence of a magnetic field perpendicular to the direction of propagation on the velocity and the absorption of sound in gaseous oxygen, nitrogen and hydrogen at ordinary and at low temperatures is studied.

TL;DR: In this article, the authors investigated the thermal resistance of crystals of KBr and KCl in the region of liquid helium and found that the increase in thermal resistance is a general property of matter.

TL;DR: In this paper, the critical point, boiling point, and triple point of krypton have been determined and expressed in a formula, and the critical points, boiling points and triple points are given.

TL;DR: In this paper, a few latent heat measurements were carried out on tin while it was passing from the superconductive to the normal state by increasing the external magnetic field at constant temperature.

TL;DR: In this paper, a methode, which permits d'etudier des susceptibilites paramagnetiques dans un champ alternatif de haute frequence, is decrit.

TL;DR: In this paper, the experimental formulae which express the dependence of the viscosity on the temperature may be divided into two classes, viz., through the expansion of the liquid.

TL;DR: In this article, ausammenfassung auf Grund des Heisenbergschen Modells eines Ferromagnetikums is discussed, in which Bloch folgendes Gesetz fur die Sattigungsmagnetisierung bei tiefen Temperaturen gefunden: σ/σ 0 = 1−c(T/Θ) 3/2.

TL;DR: In this paper, a system simultaner Differentialgleichungen fur die Lichtzerstreuung an Ultraschallwellen is abgeleitet, das unmittelbar zu de Raman-Nathschen bzw. zu der Extermann-Wannierschen Losung fuhrt.

TL;DR: In this paper, it was shown that above the normal transition point from the superconductive to the non-superconductive state the atomic heat can be represented by Cv=D (419/T)+00003484 T cal/degree mol.

TL;DR: In this paper, a general continuity equation for the time dependence of the energy distribution of particles going through matter was derived for neutrons going through paraffine when the protons can be considered at rest.

TL;DR: In this article, the authors have carried out new measurements on the velocity and absorption of sound in gases like O2, H2 and CO as a function of temperature and pressure.