Mechanical vibration signals are always composed of harmonics of different order. A novel estimator is proposed for estimating the frequency of sinusoidal signals from measurements corrupted by White ...Gaussian noise with zero mean. Also low frequency sinusoidal signal is considered along with third and fifth order harmonics in presence of noise for estimating amplitudes and phases of different harmonics. The proposed estimator known as complex H∞ filter is applied to a noisy sinusoidal signal model. State space modeling with two and three state variables is used for estimation of frequency in presence of white noise. Various comparisons in terms of simulation results for time varying frequency reveal that the proposed adaptive filter has significant improvement in noise rejection and estimation accuracy. Comparison in performance between two and three states modeling is presented in terms of mean square error (MSE) under different SNR conditions .The computer simulations clearly indicate that two states modeling based on Hilbert transform performs better than three states modeling under high noisy condition. Frequency estimation performance of the proposed filter is also being compared with extended complex Kalman filter (ECKF) under same noisy conditions through simulations.
The effect of strange interactions in neutron star matter and the role of the strange meson-hyperon couplings are studied in a relativistic quark model where the confining interaction for quarks ...inside a baryon is represented by a phenomenological average potential in an equally mixed scalar-vector harmonic form. The hadron-hadron interaction in nuclear matter is then realized by introducing additional quark couplings to \(\sigma\), \(\omega\), \(\rho\), \(\sigma^*\) and \(\phi\) mesons through mean-field approximations. The meson-baryon couplings are fixed through the SU(6) spin-flavor symmetry and the SU(3) flavor symmetry to determine the hadronic equation of state (EoS). We find that the SU(3) coupling set gives the potential depth between \(\Lambda\)s around \(-5\) MeV and favours a stiffer EoS.The radius for the canonical neutron star lies within a range of \(12.7\) to \(13.1\) km.
Developments of SOI monolithic pixel detectors Arai, Y.; Miyoshi, T.; Unno, Y. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2010, Volume:
623, Issue:
1
Journal Article
Peer reviewed
A monolithic pixel detector with 0.2μm silicon-on-insulator (SOI) CMOS technology has been developed. It has both a thick high-resistivity sensor layer and thin LSI circuit layer on a single chip. ...Integration-type and counting-type pixel detectors are fabricated and tested with light and X-rays. The process is open to many researchers through Multi Project Wafer (MPW) runs operated by KEK. Further improvements of the fabrication technologies are also under investigation by using a buried p-well and 3D integration technologies.
We report the first observation of the decay Λ c+ → pK+π- using a 980 fb-1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e- collider. This is the first observation of a ...doubly Cabibbo-suppressed decay of a charmed baryon. We measure the branching ratio of this decay with respect to its Cabibbo-favored counterpart to be B ( Λ c+ → pK+π- ) / B ( Λ c+ → pK-π+ ) = ( 2.35±0.27±0.21 ) ×10-3 , where the uncertainties are statistical and systematic, respectively.
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