18 research outputs found
Nonlinear Discrete Systems with Nonanalytic Dispersion Relations
A discrete system of coupled waves (with nonanalytic dispersion relation) is
derived in the context of the spectral transform theory for the Ablowitz Ladik
spectral problem (discrete version of the Zakharov-Shabat system). This 3-wave
evolution problem is a discrete version of the stimulated Raman scattering
equations, and it is shown to be solvable for arbitrary boundary value of the
two radiation fields and initial value of the medium state. The spectral
transform is constructed on the basis of the D-bar approach.Comment: RevTex file, to appear in Journ. Math. Phy
Small-amplitude excitations in a deformable discrete nonlinear Schroedinger equation
A detailed analysis of the small-amplitude solutions of a deformed discrete
nonlinear Schr\"{o}dinger equation is performed. For generic deformations the
system possesses "singular" points which split the infinite chain in a number
of independent segments. We show that small-amplitude dark solitons in the
vicinity of the singular points are described by the Toda-lattice equation
while away from the singular points are described by the Korteweg-de Vries
equation. Depending on the value of the deformation parameter and of the
background level several kinds of solutions are possible. In particular we
delimit the regions in the parameter space in which dark solitons are stable in
contrast with regions in which bright pulses on nonzero background are
possible. On the boundaries of these regions we find that shock waves and
rapidly spreading solutions may exist.Comment: 18 pages (RevTex), 13 figures available upon reques
Proposal for SPS beam time for the baby MIND and TASD neutrino detector prototypes
The design, construction and testing of neutrino detector prototypes at CERN
are ongoing activities. This document reports on the design of solid state baby
MIND and TASD detector prototypes and outlines requirements for a test beam at
CERN to test these, tentatively planned on the H8 beamline in the North Area,
which is equipped with a large aperture magnet. The current proposal is
submitted to be considered in light of the recently approved projects related
to neutrino activities with the SPS in the North Area in the medium term
2015-2020
Studies of HTO washout and deposition in the vicinity of emission source
There are presented in the report research results of HTO wash-out and the model of HTO atmosphere concentration in the vicinity of a long-term HT and HTO emission source. The site of the scavenging experiments was around a 30 m emission source. The sampling arcs were chosen at 150-300 m from the base of the source to minimize dry deposition on the precipitation collectors. To study dependence of scavenging of tritium on raindrops characteristics, an optical device was constructed and used to measure the distribution of the drop radii and velocities during the period of experiment. The wash-out model, used for assessments, takes into account dispersion, deposition and re-emission. Soil surface is considered as secondary area source. Primary source is characterized as a source of infinite duration and permanent strength. Ingress of HTO to soil from primary source is occurred due to both dry and wet deposition. The model of HTO wet deposition is taken into account kinetics of HTO exchange between vapor and liquid phase with parameters such as rain drop spectra, rain intensity, condensation-evaporation on drop's interface Ingress of HT in soil is only due to HT dry deposition. Gauss type formulae for permanent emission source is used to calculate HTO atmosphere concentration. Averaged real meteorological data are used as input parameters for modeling
Effect of impregnation on the structure of niobium oxide/alumina catalysts studied by multinuclear solid-state NMR, FTIR, and quantum chemical calculations
Multinuclear solid-state 1H, 27Al, and 93Nb NMR experiments and DFT calculations were carried out for structura
On the theory of carrier-induced ferromagnetism in diluted magnetic semiconductors
Two different approaches (presented in the literature as alternative approximations) to the problem of carrier-induced ferromagnetism in the system of disordered magnetic ions of a diluted magnetic semiconductor are analyzed. They are based on a self-consistent procedure for the mean exchange fields and the RKKY interaction. Calculations in the framework of exactly solvable model are carried out, and it shows that these approaches stem from two different contributions to the magnetic susceptibility. One stems from the diagonal part of the carrier-ion exchange interaction and corresponds to mean field approximation. The other one stems from the off-diagonal part of the same interaction and describes the indirect interaction between localized spins via free carriers. These two contributions can be responsible for the different magnetic properties. Thus, the aforementioned contributions are complementary but not alternative to each other. A general approach is proposed and compared with different approximations to the problem under consideration
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Studies of HT and HTO Behavior in the Vicinity of Long-Term Emission Source: Model - Experiment Intercomparison
There are presented in the research results of HT and HTO deposition and the model of HT (HTO) atmosphere concentration in the vicinity of a long-term HT and HTO emission source. Scavenging of HTO by precipitations was studied in 6 field experiments. The site of the scavenging experiments was around a 30 m emission source. The sampling arcs were chosen at 150-300 m from the base of the source to minimize dry deposition on the precipitation collectors. Data of the scavenging experiments are presented. Kinetics of HT deposition to soil through its oxidation has been studied in laboratory conditions. The activity of HTO converted in the soil sample during a certain period of time was used to determine the oxidation rate. This rate varies, depending on the catalytic and/or biological activity of the soil material. Theoretical considerations have shown that the deposition rate can be expressed by the effective rate of oxidation, which formally corresponds to the first-order HT oxidation. HT deposition rates are reported. The model, used for assessments, takes into account atmospheric dispersion, deposition and reemission. The model of HTO wet deposition is taken into account kinetics of HTO exchange between vapor and liquid phase with parameters such as rain drop spectra, rain intensity, condensation-evaporation on drop's interface. Gauss type formulae for continuous emission source is used to calculate HTO atmospheric concentration. Meteorological data are used as input parameters for modeling. The data presented on HT deposition to soil and HTO washout by precipitation is required for assessment of consequences of HT (HTO) release into the atmosphere
Effect of Impregnation on the Structure of Niobium Oxide/Alumina Catalysts Studied by Multinuclear Solid-State NMR, FTIR, and Quantum Chemical Calculations
Multinuclear solid-state <sup>1</sup>H, <sup>27</sup>Al, and <sup>93</sup>Nb NMR experiments and DFT calculations
were carried out
for structural characterization of alumina-supported niobium oxide
catalysts with high niobium content following an every stage in the
catalyst preparation. It was found that the first stage of the impregnation
procedure plays a key role in determining the catalyst structure and
acidity. In order to monitor the presence in catalysts of aluminum
niobate phase, AlNbO<sub>4</sub>, a series of <sup>27</sup>Al and <sup>93</sup>Nb NMR experiments was performed for several different individual
AlNbO<sub>4</sub> samples. Aluminum and niobium NMR parameters were
determined for AlNbO<sub>4</sub>, which crystal structure contains
two different crystallographic sites for each element. The compound
was investigated through a combination of experimental <sup>93</sup>Nb and <sup>27</sup>Al NMR spectroscopy methods at several magnetic
field strengths (9.4, 11.7, 19.4, and 21.1 T) and complemented by
ab initio quantum chemical calculations of NMR parameters for these
nuclei. The chemical shielding and the quadrupole coupling tensor
parameters were determined for both <sup>93</sup>Nb and <sup>27</sup>Al