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A novel implementation of the QR decomposition based recursive least squares (RLS) algorithm on Altera Stratix FPGAs is presented. CORDIC (coordinate rotation by digital computer) operators are efficiently time-shared to perform the QR decomposition while consuming minimal resources. Back substitution is then performed on the embedded soft Nios processor by(More)
The experiment KASCADE observes simultaneously the electron±photon, muon, and hadron components of high-energy extensive air showers (EAS). The analysis of EAS observables for an estimate of energy and mass of the primary particle invokes extensive Monte Carlo simulations of the EAS development for preparing reference patterns. The present studies utilize(More)
The number of hadrons and their energy sum in extensive air showers has been measured using the KASCADE hadron calorimeter. Shower size spectra of the hadronic component have been derived using both observables. The spectra can be described by a power law and exhibit a change in the spectral index at energies around 5 PeV. The primary cosmic–ray flux(More)
The temporal structure of the extensive air shower (EAS) muon component (E thres ˆ 2:4 GeV) is studied at sea level by measurements of the muon arrival time distributions using the muon detection facilities of the KASCADE central detector. Data have been analysed for EAS core distances up to 110 m for primary energies around the knee region. The time(More)
Severe hypokalemia (2.6 mEq/l), hypomagnesemia (0.6 mg/dl), mild hypercalcemia (10.9 mg/dl), and secondary hyperaldosteronism developed in a patient receiving viomycin for pulmonary tuberculosis. Reversible renal wasting of both potassium (K+) and magnesium (Mg++) was documented. Viomycin administered to 40 rats resulted in severe damage to the proximal(More)
The analysis of extensive air shower (EAS) data depends strongly on simulations of the air shower development in the atmosphere. The most critical point are the hadronic interaction models used in shower simulation codes for energies far above collider energies. The investigation of the hadronic component of EAS allows a detailed study of interaction(More)
In a recent publication Schatz [Astropart. Phys. (2003), this issue] argues that unambiguous results about energy distributions of primary cosmic-ray mass groups can only be obtained from measured air shower observables if their mutual correlations are explicitly taken into account. This statement is used to challenge preliminary results presented by the(More)
The extensive air shower (EAS) experiment KASCADE has started data taking at the laboratory site of the Forschungszentrum Karlsruhe. The major goal is to determine the elemental composition of the primary cosmic ray particles in the energy range around and above the knee at E k ≈ 5 · 10 15 eV. Here, we shall discuss some results on tests of hadronic(More)
A system of large-area position sensitive multiwire proportional chambers (MWPC), installed below the hadron calorimeter of the KASCADE (KArlsruhe Shower Core and Array DEtector) central detector is able to observe the density distributions of the high energy muons and hadrons penetrating the calorimeter. By use of a classification in terms of multifractal(More)
J. Engler1, T. Antoni1, W.D. Apel1, F. Badea2, K. Bekk1, K. Bernlöhr1, E. Bollmann1, H. Bozdog2, I.M. Brancus2, A. Chilingarian3, K. Daumiller4, P. Doll1, F. Feßler1, H.J. Gils1, R. Glasstetter4 , R. Haeusler1, W. Hafemann1, A. Haungs1, D. Heck1, J.R. Hörandel1z, T. Holst1, K.-H. Kampert1;4, H. Keim1, J. Kempa5, H.O. Klages1, J. Knapp4x, H.J. Mathes1, H.J.(More)