Coupling between Rydberg states and Landau levels of electrons trapped on liquid helium

We investigate the coupling between Rydberg states of electrons trapped on a liquid Helium surface and Landau levels induced by a perpendicular magnetic field. We show that this realises a prototype quantum system equivalent to an atom in a cavity, where their coupling strength can be tuned by a parallel magnetic field. We determine experimentally the renormalisation of the atomic transition energies induced by the coupling to the cavity, which can be seen as an analogue of the Lamb shift. When the coupling is sufficiently strong the transition between the ground and first excited Rydberg states splits into two resonances corresponding to dressed states with vacuum and one photon in the cavity. Our results are in quantitative agreement with the energy shifts predicted by the effective atom in a cavity model where all parameters are known with high accuracy

REVIEW OF THE LONGITARSUS ASPERIFOLIARUM GROUP OF SPECIES (COLEOPTERA: CHRYSOMELIDAE: ALTICINAE)

The Longitarsus asperifoliarum species group is reviewed. Four new species are de- scribed: L. hissaricus Lopatin, new species (Tadzhikistan), L. marguzoricus Konstanti- nov, new species (Tadzhikistan), L. tishechkini Konstantinov, new species (Kazakhstan), and L. violentoides Konstantinov, new species (Armenia). Longitarsus afghanicus Lo- patin is elevated to species status from its former status as L. asperifoliarum afghanicus. A key to the species and diagnostic characters for the group are provided. The setation of the apical and preapical abdominal tergites of females is recognized as a novel source of characters. Host plant and distributional data are included

On Possible Measurement of Gravitational Interaction Parameters on Board a Satellite

The recently suggested SEE (Satellite Energy Exchange) method of measuring the gravitational constant $G$, possible equivalence principle violation (measured by the E\"{o}tv\"{o}s parameter $\eta$) and the hypothetic 5th force parameters $\alpha$ and $\lambda$ on board a drag-free Earth's satellite is discussed and further developed. Various particle trajectories near a heavy ball are numerically simulated. Some basic sources of error are analysed. The $G$ measurement procedure is modelled by noise insertion to a ``true'' trajectory. It is concluded that the present knowledge of $G, \alpha$ (for $\lambda \geq 1$ m) and $\eta$ can be improved by at least two orders of magnitude.Comment: (only two misprints on title page) 7 page

Mathematical model of message delivery in a mobile ad hoc network

Analytic expressions for calculating the average time for delivery of a message, taking into account the effect of subscriber mobility and destructive factors are obtained. The effect of premature discontinuities of virtual connections on the efficiency of data delivery is studie

Model of neuro-fuzzy prediction of confirmation timeout in a mobile ad hoc network

This article represents an RTT prediction model based on application of fuzzy neural network theory. This model relies upon zeroorder Sugeno-Type Fuzzy Inference algorith

Method for obtaining ingots of the A34 solder based on an investigation into the relation between the structure and properties of liquid and solid metals

A comparative analysis of the influence of the modifying method on the structure and phase composition of the ingots of the A34 solder is performed. Modification is performed by force of heating the melt to 1000°C and introducing the fine-crystalline remelt in an amount of 5% of the charge amount into the melt. The investigation is performed using DTA and metallographic analysis. The structure of the ingot of the A34 solder is additionally investigated at elevated temperatures (150 and 300°C) by the sc-AFM method using the NTEGRA Therma probe nanolaboratory, and recommendations are given to optimize the modes of casting and thermal treatment. © 2013 Allerton Press, Inc