Showing papers in "Physica D: Nonlinear Phenomena in 1940"

TL;DR: In this article, a particle which is caught in a potential hole and which, through the shuttling action of Brownian motion, can escape over a potential barrier yields a suitable model for elucidating the applicability of the transition state method for calculating the rate of chemical reactions.

TL;DR: In this article, the Lagrangeschen Funktion L in an Eichinvarianz von Lagrangesche Funktion (LFG) is discussed, and the Postulat der EichInvarianz of L in einer etwas abweichenden Weise is formuliert.

TL;DR: In this article, a new attack on the order-disorder problem is made on the basis of Bethe's hypothesis of nearest neighbour action, which has the form of a non-linear finite difference equation, which proves to be a powerful mathematical tool, governing the properties above and below the critical transition temperature.

TL;DR: In this article, it was shown that in the case of an infinite number of interacting particles, no density fluctuations occur, and a general proof of the existence of an "excitation energy" which is necessary to give one particle a motion relatively to the others was given.

TL;DR: In this article, the authors compared the probability of electron ionization for the crypton, le crypton and le xenon with the probability for theargon and le neutron and showed that the latter is more intense than the former.

TL;DR: Theorie der Elektronenbeugung an Kristallen von H. Bethe wird fur den Fall der Durchstrahlung von dunnen Kristallblattchen entwickelt as discussed by the authors.

TL;DR: In this paper, the authors show that the kurzwellige Grenze der Emissionsbanden fallt with der langwelligen Grenze of fundamental Absorptionsbanden zusammen, i.e. the kombinationsfrequenzen eines Elektronenuberganges with einer Vibration.

TL;DR: In this paper, a definition rigoureuse du concept, introduced by Bethe, de groupes doubles de rhomboedre and tetraedre is introduced. But the definition of groupes double is not defined.

TL;DR: In this paper, the specific heats of four copper-nickel alloys, containing approximately 20, 40, 60 and 80 percent of copper respectively, and three iron-nicels, including 15, 20, 20 and 50 percent of iron respectively, have been measured in the temperature ranges obtainable with liquid helium and liquid hydrogen.

TL;DR: The authors untersucht, in wie weit Spekulationen uber die Statistik willkurlicher, hypothetischer Teilchen in einer relativistisch invarianten Theorie moglich sind, wenn alle oder ein Teil der folgenden drei Postulate vorausgesetzt werden: (I) the Energie is positiv; (II) Observable an verschiedenen Raum-Zeitpunkten with raumartiger Verbindung

TL;DR: In this article, the magnetization of MnSO4, Cr2(SO4)3, CrCl3, CuF2 and CuSO4 at temperatures down to 14°K was reported.

TL;DR: In this paper, the main problems regarding the shower formation by fast electrons are reviewed on the basis of a simplified model first proposed by Furry, and a general method is developed for calculating the fluctuation in the number of particles after a thickness x of matter, which is shown in § 4 that N 2 (x) can always be found when the average energy distribution F(E, x) is known.

TL;DR: In this article, the authors examined the dependence of the heat conductivity of liquid helium II, under about its saturated pressure, on the temperature and on the heat flow, in the range between 1.2°K and the λ-point.

TL;DR: In this paper, Weyl, Bargmann u.a.f. fur gewisse Arten von Grossen gegebenen Definitionen der kovarianten Ableitung werden verallgemeinert zu einem Ausdruck.

TL;DR: In this paper, the authors computed the viscosity of neon, deuterium, hydrogen and helium as a function of the temperature, at room temperature and at temperatures obtainable with liquid oxygen and liquid hydrogen.

TL;DR: In this paper, the results of measurements on the thermal conductivity of lead at temperatures between 2 and 20°K were given, and two curves were found, one for the metal in the superconducting state, the other in transversal magnetic fields.

TL;DR: In this article, the authors used the oscillating disc method to measure the viscosity of H2, D2, Ne and He as a function of pressure (10 mm-10−3 mm) at room temperature and at temperatures obtainable with liquid oxygen and liquid hydrogen.

TL;DR: In this article, a method is described which makes it possible to investigate whether for superconducting mercury in bulk the penetration depth of a magnetic field shows a variation with temperature, and it is found that such a change, if it exists, must be much smaller than that derived from the experiments of Appleyard c.s. and of Shoenberg on thin films and on colloidal mercury.

TL;DR: In this article, it was found that the temperatures calculated from the magnetic susceptibilities of three different paramagnetic salts are in agreement with the temperature scale of Bleaney and Simon, and that the specific heat of K2Cu(SO4)2.6H2O does not obey a 1 T 2 law and is much higher than might be expected from magnetic interaction only.

TL;DR: In this paper, the authors made measurements on the absorption of sound between room temperature and about 90°C, first on pure CO2 gas, and then on CO 2 gas to which small quantities of H2O or D2O-vapour were added.

TL;DR: In this article, the specific heat of the spin system and the relaxation time of spin-lattice equilibrium have been computed for iron ammonium alum and chromium potassium alum.

TL;DR: In this article, einige Beobachtungen an ZnSCdS Einkristallen bei monochromatischer beleuchtung unter dem Mikroskop are discussed, ausgehend von den von Nottingham mitgeteilten Daten uber Sattigung bei Elektronenanregung, die Anzahl der Zentren pro Volumeneinheit und der Wirkungsquerschnitt eines Zentrums berechnet.

TL;DR: In this paper, a serie de recherches sur la dispersion paramagnetique de quelques sels de la famille du fer were presented, tandis que les solutions of sels hydrates manganeux ne donnent un effet positif a la temperature ambiante.

TL;DR: In this article, an interpretation of the magnetic properties of the anhydrous salts of the iron group is discussed based on the assumption of a partial ferromagnetism and the experimental results given in two preceding papers are shown to be compatible with this assumption.

TL;DR: Schallabsorptionsmessungen wurden ausgefuhrt in leichten Gasen (H2, D2, He) bei verschieden Drucken and Temperaturen (0°-100°C) as mentioned in this paper.

TL;DR: In this paper, the authors measured the coefficient of diffusion of cadmium vapour in nitrogen under a pressure of 2 mms. Hg and at room temperature, and found that the diffusion coefficient was 0.17 cms.

TL;DR: In this article, the Quantentheorie der Wellenfelder fur Einstein-Bose and FermiDirac Teilchen with Wechselwirkung wird erweitert.

TL;DR: In this article, the K-emission spectra of the pure elements and their oxides were investigated using a vacuum spectrograph with concave grating in tangential incidence.