The formula of the all-pole low-pass frequency filter transfer function fractional order (N + α) designated for implementation by non-cascade multiple-feedback analogue structures is presented. aim to determine coefficients this and its possible variants depending on distribution fractional-order terms in function. Optimization algorithm used approximate target Butterworth magnitude response, w...

INTERSTELLAR DUST COLLECTION. T. Stephan, A. L. Butterworth, C. J. Snead, R. Srama, and A. J. Westphal, Institut für Planetologie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany ([email protected]), Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA 94720, USA, Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117...

Introduction: Measurement of the complex 3D radiation dose distribution created with advanced radiotherapy techniques such as IMRT and SRS became very important. Polymer gel dosimetry (PGD) is proposed method to recording this dose distribution. MRI, X-ray CT, ultrasound, spectrophotometry and optical CT scanners can be used for readout of Polymer gel dosimeters. Although MRI i...

We present a detailed procedure for treating data cubes obtained with the Near-Infrared Integral Field Spectrograph (NIFS) of the Gemini North telescope. This process includes the following steps: correction of the differential atmospheric refraction, spatial re-sampling, Butterworth spatial filtering, ‘instrumental fingerprint’ removal and Richardson–Lucy deconvolution. The clearer contours of...

Frequency transformation is one of the well-known techniques for design of analog and digital filters [1, 2]. This technique is based on variable substitution in a transfer function and allows us to easily convert a given prototype low-pass filter into any kind of frequency selective filter such as low-pass filters of different cutoff frequencies, high-pass filters, band-pass filters, and band-...

Explicit solutions are given for the rational function P (z) for two classes of IIR orthogonal 2-band wavelet bases, for which the scaling lter is maximally at. P (z) denotes the rational transfer function H(z)H(1=z) where H(z) is the (lowpass) scaling lter. The rst is the class of solutions that are intermediate , between the Daubechies and the Butterworth wavelets. It is found that the Daubec...

In Section 2, we give a brief introduction tcl the RS; in Section 3, we introduce an adaptive implemlentation of the RS and derive an approximate expression for convergence time linearized techniques comedy used in the analysis of phase lock loops and other nonlinear circuits; in section 4, we describe a new analog RS circuit with an adaptive tenth-order Butterworth lovv. pass filter (LPF) and ...

What precursor abilities form the building blocks of numerical representations? Two abilities were investigated: the ability to mentally represent small numerosities, indexed by subitizing speed (Butterworth, 1999), and the ability to mentally represent one’s fingers, indexed by finger gnosis (Butterworth, 1999; Penner-Wilger & Anderson, 2008). We examined the longitudinal relation between thes...

Performance analog filters depend strongly values of discrete components (Resistors and capacitors) which are selected from the series following constant values chosen. Exhaustive search on all possible combinations of value choices for an optimized design is not feasible. The metaheuristics have proved a capacity to treat such problem effectively. In this paper, we present an optimization algo...