307,580 research outputs found
MOONS : The New Multi-Object Spectrograph for the VLT
No full textMOONS is the new Multi-Object Optical and Near-infrared Spectrograph currently under construction for the Very Large Telescope (VLT) at ESO. This remarkable instrument combines, for the first time, the collecting power of an 8-m telescope, 1000 fibres with individual robotic positioners, and both low- and high-resolution simultaneous spectral coverage across the 0.64-1.8 micron wavelength range. This facility will provide the astronomical community with a powerful, world-leading instrument able to serve a wide range of Galactic, extragalactic and cosmological studies. Construction is now proceeding full steam ahead and this overview article presents some of the science goals and the technical description of the MOONS instrument. More detailed information on the MOONS surveys is provided in the other dedicated articles in this Messenger issue
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Searching for Exomoons signatures on the Rossiter-McLaughlin effect
No full textopenThe diversity and the quantity of moons in the Solar System suggest a variety of natural satellites exist around extrasolar planets. Of particular interest from an astrobiological perspective, the number of a recently predicted class of Mars-mass moons in the stellar habitable zones with day-night cycles may outnumber planets in these circumstellar regions. These large moons could be several times as massive as Ganymede, the most massive moon in the Solar System, up to
0.5 Earth masses, and are potentially detectable with current or near-future technology around the largest planets outside the Solar System. In fact, current instruments and theoretical methods are allowing the detection of sub-Earth sized extrasolar planets, down to Mercury-sized ones. Thus, the first detection of a massive extrasolar moon appears feasible and it is probably only a matter of time. The detection of these moons would not only provide insights into planet formation
and evolution but will revolutionize our understanding of life in the Universe and exoplanet science as well. In this thesis, I summarize the formation channels of massive moons, the conditions of habitability of exomoons and the techniques
that have been proposed in the past to search for them. Most notably, this thesis is focused on detecting exomoons from shape deformation or deviations on the Rossiter-McLaughlin signal of an exoplanet.The diversity and the quantity of moons in the Solar System suggest a variety of natural satellites exist around extrasolar planets. Of particular interest from an astrobiological perspective, the number of a recently predicted class of Mars-mass moons in the stellar habitable zones with day-night cycles may outnumber planets in these circumstellar regions. These large moons could be several times as massive as Ganymede, the most massive moon in the Solar System, up to
0.5 Earth masses, and are potentially detectable with current or near-future technology around the largest planets outside the Solar System. In fact, current instruments and theoretical methods are allowing the detection of sub-Earth sized extrasolar planets, down to Mercury-sized ones. Thus, the first detection of a massive extrasolar moon appears feasible and it is probably only a matter of time. The detection of these moons would not only provide insights into planet formation
and evolution but will revolutionize our understanding of life in the Universe and exoplanet science as well. In this thesis, I summarize the formation channels of massive moons, the conditions of habitability of exomoons and the techniques
that have been proposed in the past to search for them. Most notably, this thesis is focused on detecting exomoons from shape deformation or deviations on the Rossiter-McLaughlin signal of an exoplanet
Discovery of a transient radiation belt at Saturn
No full textRadiation belts have been detected in situ at five planets. Only at Earth however has any variability in their intensity been heretofore observed, in indirect response to solar eruptions and high altitude nuclear explosions. The Cassini spacecraft's MIMI/LEMMS instrument has now detected systematic radiation belt variability elsewhere. We report three sudden increases in energetic ion intensity around Saturn, in the vicinity of the moons Dione and Tethys, each lasting for several weeks, in response to interplanetary events caused by solar eruptions. However, the intensifications, which could create temporary satellite atmospheres at the aforementioned moons, were sharply restricted outside the orbit of Tethys. Unlike Earth, Saturn has almost unchanging inner ion radiation belts: due to Saturn's near-symmetrical magnetic field, Tethys and Dione inhibit inward radial transport of energetic ions, shielding the planet's main, inner radiation belt from solar wind influences
The Moons
No full textThe Moons, video che avrebbe dovuto fare parte del più ampio progetto poi realizzato We used to call it: Moon, consiste oggi in cinque brevi film, quasi delle bozze, che riprendono a camera fissa la stessa scena, con differenti illuminazioni e musiche in sottofondo. In questa scena, uno strano paesaggio costituito da piccolo sculture che sembrano rimandare a monumenti vede spostarsi al suo interno due sfere di legno, che rappresentano le due lune a cui fa riferimento il titolo.Abstract:
The Moons is a video that should have been part of a larger, realised project We used to call it: Moon. It consists of five short films which are almost drafts. The same scene is shot from the same standpoint, but with different lights and background music. In this scene, a strange landscape is composed of small sculptures that look like monuments. Two wooden spheres move and change position, representing the two moons of the title
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Integrating order picking and vehicle routing decisions
No full textB2C e-commerce is still growing annually and e-commerce customers have high expectations concerning their online purchase and its delivery. Consequently, the logistics activities of companies are under pressure, especially the order picking and vehicle routing operations. Companies have to thoroughly redesign their processes and activities. Integrating order picking and vehicle routing operations lead to larger improvements than optimising each individual subproblem separately. In this dissertation, the integrated order picking-vehicle routing problem (I-OP-VRP) is introduced and described in detail. A heuristic algorithm using a record-to-record travel framework is proposed. Experiments are conducted to quantify the value of integration. By integrating both subproblems, the service level offered to the customers can be improved and cost savings can be obtained
Titan Trek and IcyMoons Trek: Two New Online NASA Visualization and Analysis Portals for Saturn's Moons
No full textSaturns moons are the focus of two new online visualization and analysis tools produced by NASA. The Solar System Treks family of online portals provides a suite of interactive visualization and analysis tools. These enable mission planners, lunar scientists, engineers, students, and the general public to access mapped data products from past and current missions for a growing number of planetary bodies. They integrate data from a variety of instruments aboard a number of missions. This presentation will introduce two new portals in the Solar System Trek suite. Titan Trek highlights Saturns largest moon, and IcyMoons Trek features a number of Saturns other moons as studied by the Cassini mission
Associação e memória em The moons of Jupiter, de Alice Munro
No full textThis thesis aims to demonstrate that the unifying central point of the short stories Chaddeleys and Flemings and The Moons of Jupiter, from the volume The Moons of Jupiter, by Alice Munro, is the use of associations that link the return to the past through the narrative of the adult protagonist, who retells some facts occurred in childhood and those related to family life. In this trajectory, what is revealed is the women's conflict by seeking other roles than that of wife and mother. The narrative strategies used by the Canadian author to achieve this result are founded in the use of memory by her characters. To show how that works in Munro's text, Freudian studies are used in the analysis, emphasizing the work of the unconscious force manifested in the exercise of anamnesis of the protagonist-narrator.Este trabalho tem como objetivo demonstrar que o ponto central unificador dos contos Chaddeleys and Flemings e The Moons of Jupiter, do volume The Moons of Jupiter, de Alice Munro, é o uso das associações que ligam o retorno ao passado através da narrativa de uma protagonista adulta, que reconta alguns fatos ocorridos em sua infância e em sua vida familiar. Nesta trajetória, o que é revelado é o conflito feminino na busca por outros papeis além de esposa e mãe. As estratégias narrativas usadas pela autora canadense para obter este resultado estão fundamentadas no uso da memória por suas personagens. Para demonstrar como isso funciona no texto de Munro, os estudos freudianos são utilizados na análise, enfatizando o trabalho e a força do inconsciente manifesta no exercício de anamnese da protagonista-narradora.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Emerging Leaders in the Americas Program (ELAP
If All Moons Were Honeymoons
No full textFirst Line: You dear old moon I'm wonderingFirst Line of Chorus: If all the moons were honeymoonsTitle of Larger Work: The Goddess of LibertyKey: F Majo
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