Assuming ideal synchronization at the receivers, an approach to calculating the approximate theoretical bit-error rate (BER) of a coherent chaos-shift-keying (CSK) digital communication system under an additive white Gaussian noise environment is presented. The operation of a single-user coherent CSK system is reviewed and the BER is derived. Using a simple cubic map as the chaos generator, it ...

The bers produced by co-evaporation of C 60 and potassium, and subsequent treatment in toluene, have been investigated by electron microscopy and optical spectroscopy. The electron diiraction pattern can be indexed in terms of the known orthorhombic (KC 60) n structure. The frequencies of the vibrational modes indicate charge transfer between the K and the C 60 , similar to bulk samples; no ani...

With science and digitalisation emphasised further in the new Swedish preschool curriculum, there is a need to clarify teachers’ role educating children about these areas. research pointing out importance of conscious language use STEM teaching, we here focus on words used by teachers during inquiry-based activities five different preschools. Bers’ powerful ideas early childhood computational t...

We consider complex one-dimensional Bers–Maskit slices through the deformation space of quasifuchsian groups which uniformize a pair of punctured tori. In these slices, the pleating locus on one of the components of the convex hull boundary of the quotient three-manifold has constant rational pleating and constant hyperbolic length. We show that the boundary of such a slice is a Jordan curve wh...

This chapter highlights various processing methodologies that may be utilized to create a variety of structural forms from the protein fi broin, which is derived from the Bombyx mori silkworm cocoon. Modulation of fi broin material properties will be considered with respect to induced protein secondary structure formation. Additional considerations will be explored for sericin removal and fi br...

Let E=Q(T) be a one-parameter family of elliptic curves. Assuming various standard conjectures, we give an upper bound for the average rank of the bers E t (Q) with t 2 Z, improving earlier estimates of Fouvry-Pomykala and Michel. We also show how certain assumptions about the distribution of zeros of L-series might help explain the experimentally observed fact that the average rank of the bers...

A linear stability analysis is performed on a two-dimensional version of the \immersed ber problem", formulated by C. Peskin to model the ow of uid in the presence of a mesh of moving, elastic bers. The purpose of the analysis is to isolate the modes in the solution which are associated with the ber, and thereby determine the eeect of the presence of a ber on the uid. The results are used not o...

We study two boundaries for the Teichmüller space of a surface Teich(S) due to Bers and Thurston. Each point in Bers’ boundary is a hyperbolic 3-manifold with an associated geodesic lamination on S, its endinvariant, while each point in Thurston’s is a measured geodesic lamination, up to scale. We show that when dimC(Teich(S)) > 1 the end-invariant is not a continuous map to Thurston’s boundary...