Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model

We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO's second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h095%=3.47×10-25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering. © 2019 American Physical Society

Military engine condition monitoring systems The UK experience

Paper at AGARD PEP 71. Symp. on Condition Monitoring 30 May-3 Jun 1988Available from British Library Document Supply Centre- DSC:8019.3153(PNR--90512) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

Numerical predictions for the flow induced by an enclosed rotating disc

Paper at 33. ASME Gas Turbine Conf., Amsterdam (NL) Jun 1988Available from British Library Document Supply Centre- DSC:6015.42F(N--88-28281)(microfiche) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

Hot deformation and recrystallization of austenitic stainless steel: part 1. dynamic recrystallization

The hot deformation behavior of a 304 austenitic stainless steel was investigated to characterize the evolution of the dynamically recrystallized structure as a starting point for studies of the postdeformation&nbsp; recrystallization behavior. The effect of different deformation parameters such as strain, strain rate, and temperature were investigated. The flow curves showed typical signs of dynamic recrystallization (DRX) over a wide range of temperatures and strain rates (i.e., different Zener&ndash;Hollomon (Z) values). However, under very high or very low Z values, the flow curves&rsquo; shapes changed toward those of the dynamic recovery and multiple peaks, respectively. The results showed that while DRX starts at a strain as low as 60 pct of the peak strain, a fully DRX microstructure needs a high strain of almost 4.5 times the initiation strain. The DRX average grain size showed power-law functions with both the Zener&ndash;Hollomon parameter and the peak stress, although power-law breakdown was observed at high Z values. <br /