Degenerate perturbation theory is used to calculate energy levels of stationary states of the quantized discrete self-trapping (QDST) equation in the weak dispersion limit. Two specific applications are described: (1)...
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The University College London Global Thermospheric Model and the Sheffield University High-Latitude Ionospheric Convection Model have been integrated and improved to simulate the self-consistent interaction of the the...
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The University College London Global Thermospheric Model and the Sheffield University High-Latitude Ionospheric Convection Model have been integrated and improved to simulate the self-consistent interaction of the thermosphere and ionosphere at high latitudes. For mid- and low-latitudes, equatorward of 65 degrees geomagnetic, the neutral thermospheric code maintains the use of an empirical description of plasma densities. The neutral thermospheric wind velocity, composition, density, and energy budget are computed, including their full interactions with the high-latitude ion drift and the evolution of the plasma densities of O+, H+, NO+, N2
+, and O2
+. Two 24 hr Universal Time (UT) simulations have been performed at high solar activity, for a level of moderate geomagnetic activity, at the June and December solstices, to investigate the UT and seasonal response of the coupled system. During winter, the diurnal migration of the polar convection pattern into and out of sunlight, together with ion transport, plays a major role in the plasma density structure at F-region altitudes. Only during those UT periods, when the entire geomagnetic polar region is in total darkness, is the effect of auroral oval precipitation imprinted on the F-region. In summer, the increase in the proportion of molecular to atomic species, created by the global seasonal circulation and augmented by the geomagnetic forcing, is effective in controlling the plasma densities at all Universal Times. The increased destruction of atomic oxygen ions in summer reduces the mean level of F-region ionization to similar mean levels seen in winter, despite the increased level of solar insolation. The UT variation exceeds the seasonal differences, implying a longitudinal dependency in what can be described as a high-latitude winter ionospheric anomaly. Below 200 km summer plasma densities exceed winter values at all times, and are responsible for the larger summer conductivities, Joule heating, and consequent
The boundary element (BE) technique is used to analyze the effect of defect structures upon desorption processes on two-dimensional chemically active surfaces. The standard BE algorithm for diffusion is modified to in...
Modular scintillation cameras are gamma cameras with relatively small crystal faces, a small number of photomultiplier tubes (PMTs), and independent processing electronics. Our prototypical module has a 10 cm square c...
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For standard mapping, we calculate analytically the values of non-integrable parameter where the period 1 to 4 orbits variate their stability via tangent bifurcation, period doubling bifurcation and period equal bifur...
For standard mapping, we calculate analytically the values of non-integrable parameter where the period 1 to 4 orbits variate their stability via tangent bifurcation, period doubling bifurcation and period equal bifurcation. Hence, the analytical stable windows of periodic orbits are given and a complete picture can be seen for the behaviour of bifurcation of periodic motion in standard mapping.
作者：
M. SteslickaM. RadnyS. G. DavisonQuantum Theory Group
Department of Applied Mathematics and Department of Physics University of Waterloo Waterloo Ontario Canada N2L?1 and Guelph-Waterloo Program for Graduate Work in Physics University of Guelph Guelph Ontario Canada N1G?1
The effective-range approximation is adopted to study surface states of a linear array of scattering centers. It is shown that, depending on the values of the scattering length and effective range for the surface atom...
The effective-range approximation is adopted to study surface states of a linear array of scattering centers. It is shown that, depending on the values of the scattering length and effective range for the surface atom, two, one, or zero surface states can exist in the forbidden energy gap. The possibility of a smooth transition from true (stationary) surface states to virtual (decaying) states is discussed. A comparison is also made with the crystal-potential approach.
We examine a nontopological model for stable scalar solitons in 3+1 dimensions. Making the complex scalar field satisfy a local virial constraint we look into the possibility of obtaining nonsingular stationary soluti...
We examine a nontopological model for stable scalar solitons in 3+1 dimensions. Making the complex scalar field satisfy a local virial constraint we look into the possibility of obtaining nonsingular stationary solutions.
We examine a particle-production mechanism for scalar λϕ4 theory in de Sitter space which has the feature that the rate of particle production is proportional to the number of particles present, yielding an exponenti...
We examine a particle-production mechanism for scalar λϕ4 theory in de Sitter space which has the feature that the rate of particle production is proportional to the number of particles present, yielding an exponentially increasing rate of production. General arguments strongly suggest that this process is generic to any renormalizable interacting theory on de Sitter space. The interpretation of this process and its relation to the response of freely falling "particle detectors" is discussed.
In 1964 Chadwick and Windle published a detailed investigation of the secular equation governing the propagation of surface waves in a semi-infinite, isotropic, heat-conducting elastic body the surface of which is tra...
Together, both Volume I and Volume II will greatly benefit mathematical graduate students and researchers interested in mean field games. The authors provide a detailed road map through the book allowing different acc...
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ISBN:
(数字)9783319564364
ISBN:
(纸本)9783319564357;9783030132590
Together, both Volume I and Volume II will greatly benefit mathematical graduate students and researchers interested in mean field games. The authors provide a detailed road map through the book allowing different access points for different readers and building up the level of technical detail. The accessible approach and overview will allow interested researchers in the applied sciences to obtain a clear overview of the state of the art in mean field games.
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