Learn More
but the transfer function is not totally flat, like in the simulations. The reason of this difference between simulations and measurements is caused by the imperfections of the OSSB filter. After the experiments of the OSSB modulation, the effect of the mode filter is measured as well. The SMF patchcord theoretically filters off every mode groups except(More)
It is common for industrial installations to be in operation for several decades, which means that upgrading the control systems of these plants is an imperative for several reasons. As new hardware and software solutions become available, spares are increasingly hard to find and technical support for the old hardware is dropped by the vendors. Lost or(More)
This paper proposes an improvement on the read-out and networking of the sputter ion pump (VPI) controllers, used in CERN accelerators for ultra-high vacuum pumping and measurement. The vacuum control systems are built around PLCs (Programmable Logic Controllers), which communicate through Profibus with several distributed IO-stations. The VPI controllers(More)
CERN is an International Organization whose chief goal is to perform fundamental particle physics research. The main tool used for such research is a complex network of particle accelerators and detectors with very demanding requirements for vacuum levels in the beam pipes, detectors, and cryogenic insulation elements. Vacuum is partly assured by(More)
We studied the vegetation of two crystalline rock outcrops in the Atlantic Forest of northeastern Brazil. We recorded typically rupicolous species, which are rare or classified as extremely endangered, such as Aechmea guainumbiorum, found exclusively in one of the study sites. In both areas there was a predominance of therophytes over other life-forms, in(More)
  • 1