摘要:

AbstractIncorporating the dependence on transverse position co‐ordinatexof both recombination and optical absorption in a light emitting diode (LED) with laser structure, a theoretical study has been made of phase relations between a sinusoidal driving current and the light output. The theory yields a phase variation withxaccordant to a carrier‐diffusion controlled recombination wave, including the diode transient behavior due to charge storage. The phase selection by an appropriate absorption profile transverse to the recombination region is found to be of extraordinary importance for the bowing of the optical wave front at the radiating a

ISSN:0003-3804    

DOI:10.1002/andp.19730290102

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractBy use of SOMMERFELDexpansionsT3‐corrections of the degenerate electron gas specific heat are obtained. Comparisons with the results of GSELL‐MSANN[2] and KSIRKWOODand CSOWAN[6] are m

ISSN:0003-3804    

DOI:10.1002/andp.19730290103

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractThe scalar wave equation in an external gravitational field is considered. In the weakfield approximation, the time‐symmetric GREEN's function is built up via the invariant defining equation to first order in the perturbation parameter. The coefficients of the distributions are represented by four‐dimensional FOURIER integrals containing the FOURIER transform of the first‐order gravitational potential and KUMMER's func

ISSN:0003-3804    

DOI:10.1002/andp.19730290104

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractThe propagation equations for small perturbations of a background gravitational field satisfying the EINSTEINequations are considered. For the perturbation potential the covariantly generalized EINSTEIN‐HILBERTgauge is chosen. With the aid of the method used in [10], bitensor GREEN's functions for the propagation equations in a weak vacuum field are given explicitly. The tail term is obtained to be an integral of the first‐order RIEMANNcurvature tensor. As an application of the formulae, GREEN's functions for perturbations of the SCHWARZSCHILDmetric are calculated to first order in the mass parame

ISSN:0003-3804    

DOI:10.1002/andp.19730290105

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractAus einer kombinierten BOLTZMANN‐ und FOKKER‐PLANCK‐Gleichung zur Beschreibung elastischer, anregender und COULOMBscher Stöße der Elektronen mit den Neon‐Atomen bzw. miteinander werden für reduzierte elektrische Feldstärken von 0,1 bis 13 V/(cm Torr) und Ionisierungsgrade von 10−9bis 10−2der Isotropteil der Geschwindigkeitsverteilungsfunktion und die Bilanzgrößen mittlere Energie, Diffusionskoeffizient, Beweglichkeit, Transportstoßfrequenz, Stoßfrequenz für die Anregung, Stoßfrequenz für die Stufen‐ und Direktionisation und elastische und anregende Energieverluste der Elektronen berechnet sowie die gewonnenen Ergebnisse diskutiert. Zur Lösung des Problems findet ein numerisches Berechnungsverfahren Verwendung, welches in der vorausgehenden Untersuchung [2] aus

ISSN:0003-3804    

DOI:10.1002/andp.19730290106

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractAn investigation is made of the effect of a homogeneous plasma‐vacuum narrow transition region on the nature of surface wave propagation along the vacuum channel boundary. Dispersion equations, taking into account the collision damping of surface waves in the region where the wave frequency is equal to LANGMUIR frequency have been obtained. The expressions for damping coefficients of surface waves have been found both for the plane and the cylindrical geometry. Transformation of surface waves into longitudinal oscillations in the transition layer is also obtained. For a period of time, determined by the transition layer width, the surface waves, caused by initial perturbation, have been demonstrated to transform into longitudinal oscillations concentrated in the plasma‐vacuum transition layer and directed along the gradient of plasma dens

ISSN:0003-3804    

DOI:10.1002/andp.19730290107

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractFür elektronenoptische Felder mit rotationssymmetrischem elektrischem Anteil, elektrischem Vierpolanteil und magnetischem Vierpolanteil wird angegeben, wie in paraxialer Näherung und auf wellenmechanischer Grundlage aus der Wellenfunktion in der Objektebene die Intensitätsverteilung in einer beliebigen, hinter der Objektebene liegenden Einstellebene gefunden wird. Als Spezialfall ist die paraxiale wellenmechanische Abbildung in elektrischen Zylinderlinsen und in reinen Quadrupollinsen enthalt

ISSN:0003-3804    

DOI:10.1002/andp.19730290108

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

摘要:

AbstractOn the basis of our 3‐dimensional conceptions of the electromagnetic quantities [1] the MAXWELLtheory is represented in a rotating frame of reference. For such a frame the MAXWELLequations obtain additional terms depending on the angular velocity (analogous to the CORIOLISterm etc. in NEWTONian mechanics). Using these results with the help of the DIRACequation we investigate quantum mechanics in a rotating frame of reference. Also in this case we obtain interesting additional terms depending on the angular velocity. The need for such a theory is obvious for many reasons: 1. Our Earth is such a rotating laboratory. Later the rotation effects must not be neglected. 2. In magnetic resonance physics theoretical questions with respect to rotating systems are important. 3. Interesting statements result for a rotational JOSEPHSONeffect of superconductors. — All our calculations are carried out up to the first order in the angular veloc

ISSN:0003-3804    

DOI:10.1002/andp.19730290109

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

ISSN:0003-3804    

DOI:10.1002/andp.19730290110

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY

ISSN:0003-3804    

DOI:10.1002/andp.19730290101

出版商:WILEY‐VCH Verlag    

年代:1973

数据来源: WILEY