93,149 research outputs found
Interferometric Missions: Applications within ASI Space Programs
No full textThe Italian Space Agency (ASI), together with Ministry of Defence (I-AD), is involved in the realization of the COSMO-Skymed program that foresees the deployment of a constellation of 4 SAR satellites in Low Earth Orbit, dedicated to the management, control and exploitation of Earth resources for civilian and defence applications. ASI is responsible for the definition, implementation and management of the Program, while Alcatel Alenia Space Italia is the Prime Contractor responsible for the design, development and verification of the entire system. The nominal phasing of the satellites on the orbit plane has been selected in order to achieve the optimisation of the performance in terms of accessibility and revisit time w.r.t. the number of satellites. Moreover COSMO-SkyMed system is able to perform interferometric acquisitions, which yield three dimensional images and/or provide various information on land conformation change, subsidence, land-slides and so on. Then, periodically, one of the four satellites will be moved to a fixed distance with respect to another for reaching the interferometric configuration. In order to increase the operating capacity of the COSMO-Skymed system, ASI intends to start the definition of a complementary civilian program with the purpose of covering bi-static and across-track/along-across interferometry applications. Such a mission will be referred as “SABRINA”, acronym of “System for Advanced Bistatic and Radar INterferometry Applications”, based on the use of a “passive” satellite (“BISSAT”, acronym for “Bistatic and Interferometric SAR SATellite”). This satellite will fly in formation with COSMO-Skymed and then a suitable strategy shall be determined for reaching and maintaining the interferometric configuration. The paper will describe the manoeuvre strategies necessary for reaching the interferometric configuration, both for COSMO-Skymed and for BISSAT. Such strategies have been defined taking into account all the constraints coming from the satellite (Δv size, minimum interval time between two consecutive manoeuvres, propulsion S/S performance, AOC requirements). After the description of the manoeuvres requested for achieving the interferometric configurations foreseen for COSMO-Skymed (tandem and “tandem-like”), the paper will focus on the configuration requested for the BISSAT satellite for flying in formation with a single COSMO-SkyMed satellite. Two formation configurations will be selected: pendulum or cartwheel. The mission will carry out interferometric acquisitions in the following configurations: 1. Across track interferometry 2. Along track interferometry The mission will carry out bistatic acquisition multi-angle and multi-polarization with a baseline variable in the range 100-500 km
Tommy F. Robinson papers, 1950-1992
No full textThis collection contains newspaper articles, photographs, correspondence, and campaign materials related to Tommy F. Robinson's campaigns and career.Tommy F. Robinson papers, 1950-199
Samuel F. Wyman letters
No full textThis collection contains five letters written by Samuel F. Wyman while serving in Company I of the 3rd Minnesota Infantry, as well as three letters written prior to the war, all to his cousin, Susan Wyman of West Cambridge, Massachusetts
ASI Sprint Report Series
No full textThe ASI Sprint Report Series serves as a conduit for exploring the phenomenon of ‘appification’ and its various societal, cultural, and political-economic impacts worldwide. Dedicated to critical app studies inquiry, this series showcases ongoing research efforts conducted by researchers associated with the App Studies Initiative (ASI) in collaboration with Master's students, such as those enrolled in the course ‘Appification: The Cultures and Economies of Apps’, offered within the Department of Media Studies at the University of Amsterdam. Published by the ASI, each report features the latest research generated during recent ‘sprints’, with the aim of disseminating ongoing research within the broader app and platform studies research community. DOI: https://doi.org/10.17605/osf.io/hv34x. Series URL: https://appstudies.org/research-output/publications/asi-sprint-report-series/.
The App Studies Initiative (ASI) is an international research network comprising academic experts in app-related media research who contribute to the study of apps and platforms. The research network involves researchers and faculty from the University of Amsterdam and Utrecht University (the Netherlands), the University of Warwick and Goldsmiths, University of London (United Kingdom), Concordia University and the University of Toronto (Canada), amongst others. Its directors are Anne Helmond, David Nieborg, Fernando van der Vlist, and Esther Weltevrede. Contact: @appstudies; https://appstudies.org/
Open access self-archiving: An author study
No full textThis, our second author international, cross-disciplinary study on open access had 1296 respondents. Its focus was on self-archiving. Almost half (49%) of the respondent population have self-archived at least one article during the last three years. Use of institutional repositories for this purpose has doubled and usage has increased by almost 60% for subject-based repositories. Self-archiving activity is greatest amongst those who publish the largest number of papers. There is still a substantial proportion of authors unaware of the possibility of providing open access to their work by self-archiving. Of the authors who have not yet self-archived any articles, 71% remain unaware of the option. With 49% of the author population having self-archived in some way, this means that 36% of the total author population (71% of the remaining 51%), has not yet been appraised of this way of providing open access. Authors have frequently expressed reluctance to self-archive because of the perceived time required and possible technical difficulties in carrying out this activity, yet findings here show that only 20% of authors found some degree of difficulty with the first act of depositing an article in a repository, and that this dropped to 9% for subsequent deposits. Another author worry is about infringing agreed copyright agreements with publishers, yet only 10% of authors currently know of the SHERPA/RoMEO list of publisher permissions policies with respect to self-archiving, where clear guidance as to what a publisher permits is provided. Where it is not known if permission is required, however, authors are not seeking it and are self-archiving without it. Communicating their results to peers remains the primary reason for scholars publishing their work; in other words,
researchers publish to have an impact on their field. The vast majority of authors (81%) would willingly comply with a mandate from their employer or research funder to deposit copies of their articles in an institutional or subject-based repository. A further 13% would comply reluctantly; 5% would not comply with such a mandate
John F. Donelson Korean War collection
No full textThis collection contains an oral history interview with John F. Donelson from December 9, 2010
ASI values for six simulated artifact distributions from no mixing (a) to severe mixing (f).
No full textASI values for six simulated artifact distributions from no mixing (a) to severe mixing (f).</p
William F. Howard Civil War letter
No full textThis collection consists of a letter written by William F. Howard while he served with the 59th Illinois Infantry
James F. Birtcher Vietnam War collection [DIGITAL CONTENT]
No full textThis collection records the service of James F. Birtcher in the Vietnam War
William F. Schafer Civil War letters
No full textThis collection contains thirty-nine letters or fragments of letters written by William F. Schafer of the 46th Indiana Infantry to his wife and one letter written to Schafer by his sister Anna
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