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1.
For an annular cathode in a coaxial diode it has been shown that the averaged electric field strength at the end face of the
cathode, En, depends on the edge thickness h as
. It has been found that the field strength varies with distance from the edge approximately as
. The problem of the electric field strength at the edge of the cathode in a magnetically insulated coaxial diode has been
solved for the case where the cathode emissivity is limited with the use of a model assuming a given internal resistance of
the voltage source.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 71–76, March, 2008. 相似文献
2.
Min Chen 《International Journal of Theoretical Physics》1998,37(5):1547-1567
In this paper, we present several systematicways to find exact traveling-wave solutions of thesystems
where a, b, c, and d are real constants. These systems,derived by Bona, Saut and Toland for describingsmall-amplitude long waves in a water channel, areformally equivalent to the classical Boussinesq systemand correct through first order with regard to asmall parameter characterizing the typicalamplitude-todepth ratio. Exact solutions for a largeclass of systems are presented. The existence of theexact traveling-wave solutions is in general extremely helpful inthe theoretical and numerical study of thesystems. 相似文献
3.
Shi-Hai Dong 《International Journal of Theoretical Physics》2000,39(6):1529-1541
The Levinson theorem for the one-dimensional Schrödinger equation with both local and the nonlocal symmetric potentials is established by the Sturm–Liouville theorem. The critical case where the Schro;audinger equation has a finite zero-energy solution is also analyzed. It is shown that the number n
+ (n
–) of bound states with even (odd) parity is related to the phase shift +(0)[–(0)] of the scattering states with the same parity at zero momentum as
and
The problems on the positive-energy bound states and the physically redundant state related to the nonlocal interaction are also discussed. 相似文献
4.
The L Collaboration 《The European Physical Journal C - Particles and Fields》2006,45(3):569-587
The mass and the total decay width of the W boson are measured with the L3 detector at the LEP e+e– collider using W-boson pairs produced in 0.7 fb–1 of data collected at centre-of-mass energies between 161 and 209 GeV. Combining semi-leptonic and fully-hadronic final states,
the mass and the width of the W boson are determined to be
where the first uncertainty is statistical and the second systematic. 相似文献
5.
We consider a family of Hamiltonian systems
and we prove that it is integrable for
. To show this we use the normal variational equation. 相似文献
6.
We prove the existence of bubbling solutions for the following Chern-Simons-Higgs equation:
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$ \Delta u +\frac{1}{\varepsilon^2} e^u(1-e^u) =4\pi \sum_{j=1}^N \delta_{p_j},\quad {\rm in}
\, \Omega, $ \Delta u +\frac{1}{\varepsilon^2} e^u(1-e^u) =4\pi \sum_{j=1}^N \delta_{p_j},\quad {\rm in}
\, \Omega, 相似文献
7.
Maximal Inequalities for CIR Processes 总被引：1，自引：0，他引：1
Let X be a Cox—Ingersoll—Ross (CIR) process given by
8.
According to the Einstein-Mayer theory of the Riemanniann space-time with Einstein-Cartan teleparallelism, the local Lorentz
invariance is broken by the gravitational field defining Machian reference systems. This breaking of symmetry implies the
occurrence of “hidden matter” in the Einstein equations of gravity. The hidden matter is described by the non-Lorentz-invariant
energy-momentum tensor
satisfying the relation
. The tensor
is formed from the Einstein-Cartan torsion field given by the anholonomy objects, FAik=2hA[i,k], and appears together with Hilbert’s energy-momentum tensor T*
ik and Poincaré’s pressure λgik on the right-hand side of Einstein’s equations so that one has
9.
Daniel Maerten 《Letters in Mathematical Physics》2008,86(1):1-18
Eigenvalue estimate for the Dirac–Witten operator is given on bounded domains (with smooth boundary) of spacelike spin hypersurfaces
satisfying the dominant energy condition, under four natural boundary conditions (MIT, APS, modified APS and chiral conditions).
Roughly speaking, any eigenvalue of the Dirac–Witten operator satisfies
10.
Dong Li 《Journal of statistical physics》2007,129(2):265-287
It has been shown in E and Li (Comm. Pure. Appl. Math., 2007, in press) that the Andersen dynamics is uniformly ergodic. Exponential convergence to the invariant measure is established
with an error bound of the form
11.
L. R. Abramo L. Brenig E. Gunzig Alberto Saa 《International Journal of Theoretical Physics》2003,42(6):1145-1152
We investigate the dynamics of Einstein equations in the vicinity of the two recently described types of singularity of anisotropic and homogeneous cosmological models described by the action
12.
We find that the Laplace sequences of surfaces of period n in projective space P
n–1 have two types, while type II occurs only for even n. The integrability condition of the fundamental equations of these two types have the same form
13.
We consider the Zakharov equation in space dimension two
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