A systematic approach for the design of Switched Current (SI) ladder filters is described. The specifications of the filter in z-domain are used to obtain continued fraction expansions (CFE). Signal Flow Graphs (SFG) of each row of the expansion is derived and then these SFG are directly transformed into switched current structures (integrators and amplifiers). The SI blocks thus obtained are c...

In cooperation with IVECO Magirus for the new generation of fire turntable ladders a trajectory tracking control was developed to avoid swaying of the cage especially in case of large ladder lengths. Beside the active damping of the upcoming oscillations as a new functionality a automated mode for the ladder operation was implemented. This automated mode has to provide time indexed reference fu...

Bethe-Salpeter (BS) equation in Minkowski space for scalar particles is solved for a kernel given by a sum of ladder and cross-ladder exchanges. The solution of corresponding Light-Front (LF) equation, where we add the time-ordered stretched boxes, is also obtained. Cross-ladder contributions are found to be very large and attractive, whereas the influence of stretched boxes is negligible. Both...

Physical nature of dimensional crossovers in coupled one-dimensional systems has currently provoked a great deal of controversy. Recent discovery of the superconductivity in the doped spin ladder under pressure has stimulated us to study the dimensional crossover problem in the weakly coupled ladder system. In the present work, based on the perturbative renormarization-group approach (PRG) deve...

Fully conjugated ladder polymers (cLPs), in which all the backbone units on the polymer main-chain are π-conjugated and fused, have attracted great interest owing to their intriguing properties, remarkable chemical and thermal stability, and potential suitability as functional organic materials. The synthesis of cLPs can be, in general, achieved by two main strategies: single-step ladderization...

In this paper, we introduce a new model of the crystal B(Λ0) of c sl`. We briefly describe some of the properties of this crystal and compare it to the combinatorial model of Misra and Miwa. Résumé. Dans cet article on propose un nouveau modèle du cristal B(Λ0) de c sl`. On décrit brièvement les propriétés du cristal et on le compare avec le modèle combinatoire de Misra et Miwa.

BACKGROUND It is widely assumed that poor health lowers life satisfaction when ageing. Yet, research suggests this relationship is not straightforward. This study investigated how older people evaluate their life when facing disease and disabilities. METHODS The Leiden 85-plus Study, a prospectively followed cohort of a cohort of a middle-sized city in the Netherlands, all aged 85 years, that...

Abstract : In this paper we derive first−order sensitivity expressions for constant−resistance analog filters, that can be used in tree−structured analog filter banks. It is shown that the passband sensitivity is approximately equal to that of a singly resistively terminated ladder network, but weighted with the squared magnitude of the frequency response in the stopband. This makes properly de...

We derive theWard-Takahashi identity obeyed by the fermion-antifermiongauge boson vertex in ladder QED in the presence of a constant magnetic field. The general structure in momentum space of the fermion mass operator with external electromagnetic field is discussed. Using it we find the solutions of the ladder WT identity with magnetic field. The consistency of our results with the solutions o...