The magnetic excitations in the stripe phase of high-Tc superconductors are investigated in a model of spin ladders which are effectively coupled via charged stripes. Starting from the effective single-triplon model for the isolated spin ladder, the quasi-one-dimensional spin system can be described straightforwardly. Very good agreement is obtained with recent neutron scattering data on La15/8...

modern world revolutions have created some instruments known as ‎quasi-negotiable instruments which are different from negotiable ones, ‎despite having some similarities to them. commercial custom recognizes ‎them as quasi-negotiable instruments. the principle is that we don’t ‎need new legal regime for this new category because they are right in ‎personam when they are created and rights in re...

In this paper we investigate for the first time the near-field optical behavior of two-dimensional Fibonacci plasmonic lattices fabricated by electron-beam lithography on transparent quartz substrates. In particular, by performing near-field optical microscopy measurements and three dimensional Finite Difference Time Domain simulations we demonstrate that near-field coupling of nanoparticle dim...

Maxwell equations are posed as variational boundary value problems in the function space H(curl) and are discretized by Nédélec finite elements. In Beck et al., 2000, a residual type a posteriori error estimator was proposed and analyzed under certain conditions onto the domain. In the present paper, we prove the reliability of that error estimator on Lipschitz domains. The key is to establish ...

We give a characterization of all (quasi) aane frames in L 2 (R n) which have a (quasi) aane dual in terms of the two simple equations in the Fourier transform domain. In particular, if the dual frame is the same as the original system, i.e. it is a tight frame, we obtain the well known characterization of wavelets. Although these equations have already been proven under some special conditions...

In paper PI (Znojil M, Yanovich D and Gerdt V P 2003 J. Phys. A: Math. Gen. 36 6531), a q−parametric class of oscillators in D dimensions was found quasi-exactly solvable up to q = 3 in D → ∞ limit (with an unfinished extension up to q = 5). Here, a certain clarification of the existence and structure of these solutions is offered using an upside-down symmetry of their definition. The construct...

Improved multimedia capabilities of information technology have resulted in increased interest in e-learning programs. Consequently, researchers and practitioners are investigating ways for design and development of effective e-learning programs. The prevailing tendency seems to be to use “richer” medium, in the progression from text to graphics to audio to video. It is not clear, however, if a...

Quasi-Monte Carlo methods are based on the idea that random Monte Carlo techniques can often be improved by replacing the underlying source of random numbers with a more uniformly distributed deterministic sequence. Quasi-Monte Carlo methods often include standard approaches of variance reduction, although such techniques do not necessarily directly translate. In this paper we present a quasi-M...

Prolog’s support for dynamic programming, meta programming and text processing using context free grammars make the language highly suitable for defining domain specific languages (DSL) as well as analysing, refactoring or generating expression states in other (programming) languages. Well known DSLs are the DCG (Definite Clause Grammar) notation and constraint languages such as CHR. These exte...

A. N. Artemyev† 1,2, A. Surzhykov1,2, P. Indelicato3, G. Plunien4, and Th. Stöhlker1,2,5 1University of Heidelberg, Germany; 2GSI, Darmstadt, Germany; 3École Normale Supérieure, Paris, France; 4TU Dresden, Germany; 5Helmholtz-Institut Jena, Germany With the recent experimental advances in accelerator and storage ring techniques, novel opportunities arise to study slow collisions between heavy, ...