897 research outputs found
Questions to objects/ Vragen aan objecten
No full textQuestions to objects/ Vragen aan objecten is a bilingual artist book written by Vlad Ionescu about the artistic research project of Nedda El-Asmar, professor at PXL MAD. School of Arts. Nedda El-Amsar is hereby recognised as co-author of the book. The book deals with the tranformative process of melting donated gold and turning it into a newly designed object.
https://www.borgerhoff-lamberigts.be/mer/shop/books/nedda-el-asmar-questions-to-objects-vragen-aan-objecte
MORE: An advanced tracking experiment for the exploration of Mercury with the mission BepiColombo
No full textPrecise microwave tracking of interplanetary spacecraft has been a crucial tool in solar system exploration. Range and range rate measurements, the main observable quantities in spacecraft orbit determination and navigation, have been widely used to refine the dynamical model of the solar system and to probe planetary interiors. Thanks to the use of Ka-band and multifrequency radio links, a significant improvement in microwave tracking systems has been demonstrated by the radio science experiments of the Cassini mission to Saturn. The Cassini radio system has been used to carry out the most accurate test of general relativity to date. Further developments in the radio instrumentation have been recently started for the Mercury Orbiter Radio Experiment (MORE), selected for the ESA mission to Mercury, BepiColombo. MORE addresses the mission's scientific goals in geodesy, geophysics and fundamental physics. In addition, MORE will carry out a navigation experiment, aiming to a precise assessment of the orbit determination accuracies attainable with the use of the novel instrumentation. The key instrument is a Ka/Ka band digital transponder enabling a high phase coherence between uplink and downlink carriers and supporting a wideband ranging tone. The onboard instrumentation is complemented by a ground system based upon the simultaneous transmission and reception of multiple frequencies at X- and Ka-band. The new wideband ranging system is designed for an end-to-end accuracy of 20 cm using integration times of a few seconds. Two-way range rate measurements are expected to be accurate to 3 mu m/s, thanks to nearly complete cancellation or calibration of the propagation noise from interplanetary plasma and troposphere. We review the experimental configuration of the experiment and outline its scientific goals and expected results. (C) 2009 Published by Elsevier Ltd
Plans for Investigating Mercury Interior Structure with the BepiColombo Radio Science Experiment
No full textBusiness continuity readiness : the case of Lebanon - by Fadi Zouhair El-Asmar.
No full textProject (M.B.A.)--American University of Beirut, Suliman S. Olayan School of Business, 2011.;"First Reader : Dr. Philippe Zgheib, Assistant Professor, Suliman S. Olayan School of Business Second Reader : Dr. Reina Arakji, Assistant Professor, Suliman S.Includes bibliographical references (leaves 54-56)The aim of this research is to assess Lebanese companies’ readiness to continue operations in case of a disaster and highlight the necessity of business continuity and disaster recovery planning in a country that is prone to high risk events such as Leba
Owner's inscription in The tales of the genii, or, The delightful lessons of Horam the son of Asmar
No full textabstract: Owner's inscription in The tales of the genii, or, The delightful lessons of Horam the son of Asmar. Volume 1: Lady Bute from Lord Dart[mouth]. Volume 2: Lady ButePages were clipped when this book was rebound. Morell, Charles, Sir, 1736-1765
MORE: an advanced tracking experiment for the exploration of Mercury with the mission BepiColombo
No full textPrecise microwave tracking of interplanetary spacecraft has been a crucial tool in solar system exploration. Range and range rate measurements, the main observable quantities in spacecraft orbit determination and navigation, have been widely used to refine the dynamical model of the solar system and to probe planetary interiors. Thanks to the use of Ka-band and multifrequency radio links, a significant improvement in microwave tracking systems has been demonstrated by the radio science experiments of the Cassini mission to Saturn. The Cassini radio system has been used to carry out the most accurate test of General Relativity to date. Further developments in the radio instrumentation have been recently started for the MORE experiment, selected for the ESA mission to Mercury, BepiColombo. MORE addresses the mission's scientific goals in geodesy, geophysics and fundamental physics. In addition, MORE will carry out a navigation experiment, aiming to a precise assessment of the orbit determination accuracies attainable with the use of the novel instrumentation. The key instrument is a Ka/Ka band digital transponder enabling a high phase coherence between uplink and downlink carriers and supporting a wideband ranging tone. The onboard instrumentation is complemented by a ground system based upon the simultaneous transmission and reception of multiple frequencies at X and Ka-band. The new wideband ranging system is designed for an end-to-end accuracy of 20 cm using integration times of a few seconds. Two-way range rate measurements are expected to be accurate to 3 micron/s, thanks to nearly complete cancellation or calibration of the propagation noise from interplanetary plasma and troposphere. We review the experimental configuration of the experiment and outline its scientific goals and expected results
Reducing Doppler noise with multi-station tracking: The Cassini test case
No full textDoppler tracking of Solar System probes is used for spacecraft navigation, planetary geodesy, and tests of the theory of General Relativity. The spacecraft radial velocity is measured by observing the Doppler shift of a radio signal transmitted from an Earth station to the spacecraft and then re-transmitted back, while preserving phase coherence, to the same station (two-way link) or to a different station (three-way link). Specialized orbit determination software is then used to reconstruct the spacecraft trajectory and estimate planetary gravity field coefficients or relativistic parameters. The measurement noise is a crucial element for the accuracy of the final estimates, thus considerable effort has been devoted to improve the range rate accuracy by adopting higher frequency links to reduce the dispersive noise from interplanetary and ionospheric plasmas, and by calibrating the tropospheric path delays with microwave radiometers. While Ka-band radio links (32–34 GHz) allowed a successful suppression of plasma noise, reducing tropospheric noise and ground antenna mechanical noise has been more challenging. The Time-Delay Mechanical noise Cancellation (TDMC) technique is a promising method to reduce mechanical and tropospheric noises and to improve further the accuracy of Doppler measurements. The TDMC is a linear combination of simultaneous Doppler data from a main antenna providing the two-way link and a three-way antenna (generally smaller and stiffer). If the listen-only, three-way antenna is also located in a particularly dry site, the TDMC can considerably reduce both tropospheric and antenna mechanical noises, which are the leading disturbances in two-way Ka-band radio links. For an operational test of this method, we applied the TDMC to Doppler data at X-band (7.2–8.4 GHz) from the Cassini spacecraft acquired during the Saturn tour phase of the mission. Although X-band links are generally dominated by the highly-variable interplanetary plasma noise and are not suitable for the TDMC, we found that, when local noises are particularly large at the two-way antenna, this technique may still lead to up to a factor-of-three noise reduction (at 60-s integration time) with respect to the two-way link. The TDMC can maximize the data quality during unique events, mainly planetary or satellite flybys (such as those considered in the Europa Clipper and JUICE missions), where the scientific results could be severely hampered by adverse conditions at the tracking station
Spacecraft Doppler tracking: Noise budget and accuracy achievable in precision radio science observations
No full textThe Determination of Jupiter’s Angular Momentum from the Lense-Thirring Precession of the Juno Spacecraft
No full textStreaming difference(s): Netflix and the branding of diversity
No full textSince 2020, Netflix has emphasised the diversity of representation the platform provides through its content. Following the publication of its diversity report, the streamer positions itself as a driver of inclusion for underrepresented communities in film and television industries. This article examines how Netflix rhetorically frames the emphasis on diversity in its corporate communication. Based on a thematic analysis of Netflix�s press releases, it explores how Netflix uses its branding of diversity to generate a transnational appeal. The article outlines four strategies which highlight the cultural and industrial practices deployed by the streamer to gain competitive advantages. In 2021, Netflix published its first diversity report detailing the make-up of its talents across all US commissioned films and series released between 2018 and 2019. The report shows that, overall, Netflix is outpacing the global entertainment industry with regards to the representation and inclusion of underrepresented groups
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