88,608 research outputs found
Relief and Drainage Integration as Geomorphic Expressions of Regional Uplift and Local Footwall Flexure in a Portion of Sila Massif, Southern Apennines (Calabria, Italy)
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Perforated fairings for landing gear noise control
No full textLanding gears of commercial aircraft make an important contribution to total aircraft noise in the approach configuration. Using fairings to shield components from high speed impingement reduces noise. Furthermore, perforating these fairings has been confirmed by flight tests to further enable noise reduction. Following a more fundamental study on the application of perforated fairings, a study has been performed to investigate and optimize the benefits of bleeding air through landing gear fairings. By means of wind tunnel tests, an aerodynamic and acoustic survey has been performed on a simplified generic main landing gear to explore the influence of (perforated) fairings on the lower part of the gear. The results show that for this specific case, the application of impermeable fairings reduces noise in the mid- and high frequency range by shielding sharp edged components from high velocity impingement. However, below 1 kHz the noise is shown to increase significantly. Application of the perforations is shown to diminish this low frequency increase whilst maintaining the reduction in the mid- and high frequency range. The aerodynamic and acoustic measurements point in the direction of the separated flow of the fairings interacting with the downstream gear components responsible for the low frequency noise increase. Bleeding of the air through the fairings reduces the large scale turbulence in the proximity of these components and hence diminishes the low frequency increase. A sharp noise increase is present in the ground view direction at the 500 Hz centred tertsband for the solid fairing, which is confirmed to originate from the articulation link fairing. The flow around the wheels remains largely unaltered by application of the fairings. Furthermore the application of fairings is shown to suppress vortex shedding from the lower part of the main leg. A study on the effectiveness of perforation location reveals that the stagnation area perforations are responsible for most of the low frequency noise decrease. Both articulation link and undertray fairing contribute to the reduction. Exposing the perforate outside the stagnation area induces perforate self-noise, most significantly on the sides of the lower articulation link fairing. Agreeing with previous studies, the phenomenon scales with the local component of the shearing flow velocity and orifice diameter
American Indial Educational Opportunities Program at Hampton University
No full textThe American Indian Educational Opportunities Program (AIEOP) at Hampton University was formed to provide scholarship and other support to eligible students from state and federally recognized tribal groups on campus. During the reporting period, AIEOP worked to enhance American Indian participation at Hampton through a variety of means, including recruitment and retention of students, outreach activities, curatorial efforts, course instruction, and sponsorship of educational programs. Dr. Paulette F. Molin, a member of the Minnesota Chippewa Tribe, served as the program's director
Une "note de service des chemins de fer couverte d’esquisses musicales". Étude de F-Pn, Mus. N.L.a 32bis [9]
No full textThe "memorandum" F-Pn, Mus. N.L.a 32bis [9] from the State Railways, dated 5 September 1914, helped to "facilitate the trip" from Paris to Angers "of M. Debussy and 4 people". Seldom mentioned before 1980, this document has never before been studied nor reproduced in its entirety, despite being covered in musical sketches. While the sketches for the "étude Pour les notes répétées" were knows since 1933, the others were, until now, neglected: they relate to the incomplete version of the "étude Pour les arpèges composés" and to the "Sonate pour violoncelle et piano"
FIGURE 14a–f in The South American species of Chalcis Fabricius (Hymenoptera: Chalcididae)
No full textFIGURE 14a–f. Chalcis pilicauda (Cameron), female: a, habitus, lateral; b, habitus, dorsal; c, head, frontal; d, head and antenna, frontolateral; e, pro- and mesopleura; f, protarsus.Published as part of Saguiah, Pâmella Machado, Molin, Ana Dal & Tavares, Marcelo Teixeira, 2020, The South American species of Chalcis Fabricius (Hymenoptera: Chalcididae), pp. 353-383 in Zootaxa 4885 (3) on page 373, DOI: 10.11646/zootaxa.4885.3.3, http://zenodo.org/record/429669
Statistic analysis of thermometric and pluviometric trends along the Adriatic side of the Italian peninsula
No full textFIGURE 19a–f in The South American species of Chalcis Fabricius (Hymenoptera: Chalcididae)
No full textFIGURE 19a–f. Chalcis winstonae sp. nov., holotype female: a, habitus, lateral; b, habitus, dorsal; c, head, frontal; d, antenna, inner face; e, metafemur, outer face; f, propodeum.Published as part of Saguiah, Pâmella Machado, Molin, Ana Dal & Tavares, Marcelo Teixeira, 2020, The South American species of Chalcis Fabricius (Hymenoptera: Chalcididae), pp. 353-383 in Zootaxa 4885 (3) on page 378, DOI: 10.11646/zootaxa.4885.3.3, http://zenodo.org/record/429669
«A Wave of Ultra-Modern Music». Venezia e oltre. Manoscritti e documenti dagli archivi musicali della Fondazione Giorgio Cini / «A Wave of Ultra-Modern Music». Venice and beyond. Manuscripts and Documents from the Giorgio Cini Foundation Music Archives. Giovanni Morelli in Memoriam.
No full textThe Giorgio Cini Foundation Institute of Music works to safeguard and make the best possible use of its 20th- and 21st-century archives with a special focus on those created by leading figures from the worlds of music, dance and audiovisual production. The documents on show come from eight archives, which are separate but interrelated in documentary and historical terms. Arranged according to the order of events, six showcases document stays in Venice or visits to the international Venetian scene by Alfredo Casella, Gian Francesco Malipiero, Aurel Milloss, Luigi Cortese, Gino Gorini, Alberto Bruni Tedeschi, Camillo Togni and Nino Rota. They thus range from Arnold Schönberg’s Venetian stage on his celebrated Italian tour with Pierrot Lunaire and Casella’s Concerto for String Quartet to the world première of Camillo Togni’s Gesang zur Nacht, but also include Malipiero composing for film and writing on Stravinsky. The overall effect is a polyphonic chorus of music history, albeit with some irreconcilable or not yet reconciled features between works such as Gorini’s Sonata for Piano and Cello and Cortese’s Cinque momenti musicali, or, surprisingly, Bruni Tedeschi’s Diagramma circolare and Mario Monicelli’s The Great War. The last showcase is devoted to Rota’s music for The Godfather
Morphometric study of the central Apennines topography (Italy): the evidence of the linkage between deep and surface earth processes
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