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We evaluate three open source enterprise service buses (ESBs) Fuse, Mule and OpenESB, focusing on their support of high availability. Since high availability for the these ESBs relies on transactional Java messaging service (JMS) in a staged event driven architecture (SEDA), we review JMSs first. On this base, we evaluate and rate the ESBs on their support(More)
—The extended Kalman filter (EKF) can be used for the purpose of training nonlinear neural networks to perform desired input–output mappings. To improve the computational requirements of the EKF, Puskorius et al. proposed the decoupled EKF (DEKF) as a practical remedy for the proper management of computational resources. This approach, however, sacrifices(More)
A high signal-to-noise spectrum covering the largest number of hydrogen lines (90 H(2) lines and 6 HD lines) in a high-redshift object was analyzed from an observation along the sight line to the bright quasar source J2123-005 with the Ultraviolet and Visual Echelle Spectrograph on the European Southern Observatory Very Large Telescope (Paranal, Chile).(More)
A molecular hydrogen absorber at a lookback time of 12.4 billion years, corresponding to 10% of the age of the Universe today, is analyzed to put a constraint on a varying proton-electron mass ratio, μ. A high resolution spectrum of the J1443+2724 quasar, which was observed with the Very Large Telescope, is used to create an accurate model of 89 Lyman and(More)
Spectra of molecular hydrogen (H2) are employed to search for a possible proton-to-electron mass ratio (μ) dependence on gravity. The Lyman transitions of H2, observed with the Hubble Space Telescope towards white dwarf stars that underwent a gravitational collapse, are compared to accurate laboratory spectra taking into account the high temperature(More)
" I should mention also the great scientific value [of Buldir]; a strictly isolated island with an isolated fauna in which the elements may interact unhindered. This will be of great value and interest to the biologist of the future "-Olaus Murie, 1936 in Biological investigations of the Aleutian Islands and southwestern Alaska " We were a weather station,(More)