Hub loads analysis of the SA349/2 helicopter

The forces and moments at the rotor hub of an Aerospatiale SA349/2 helicopter were investigated. The study included three main topics. First, measured hub forces and moments for a range of level flight conditions (mu = 0.14 to 0.37) were compared with predictions from a comprehensive rotorcraft analysis to examine the influence of the wake model on the correlations. Second, the effect of changing the blade mass distribution and blade chordwise center of gravity location on the 3/rev nonrotating frame hub loads was studied for a high-speed flight condition (mu = 0.37). Third, the use of higher harmonic control to reduce nonrotating frame 3/rev hub shear forces was investigated. The last two topics were theoretical studies only

Globalising cartography?:the International Map of the World, the International Geographical Union, and the United Nations

Few maps mirror the history of the twentieth century as closely as the International Map of the World (IMW). A proposal for a map of the entire globe on a scale of 1:1 million, using standard conventional signs, was presented at the Fifth International Geographical Congress in Berne in 1891 by the German geographer Albrecht Penck. More than two decades later, the final specification was finally published shortly before the outbreak of the First World War, a crisis that brought a halt to the international collaboration on which the project depended. The IMW’s fortunes waxed and waned over the next three decades, necessitating a major review of its continuing value after the Second World War. A new IMW Executive Commission under the chairmanship of John Kirtland Wright, Director of the American Geographical Society, was established at the 1949 Lisbon conference of the International Geographical Union. Drawing on Wright’s correspondence in the AGS archives, this paper examines the debates between the national cartographic agencies and related societies involved in the future of the IMW, with particular reference to the transfer of the project’s Central Bureau from the British Ordnance Survey in Southampton to the United Nations in New York in the early 1950s. This discussion, which focused mainly on the need to combine the IMW with an internationalized version of the US-dominated 1:1 million World Aeronautical Chart, reveals the on-going tensions between the ideals of scientific internationalism embodied in the IMW’s original proposal and the harsh realities of national self-interest in the early years of the Cold War

Acute Effects of High-Intensity Exercise on Peripheral Conduit Artery Blood Flow

Please refer to the pdf version of the abstract located adjacent to the title

The Effects of Acute Resistance Exercise on Vascular and Cognitive Function

Please refer to the pdf version of the abstract located adjacent to the title

Discovery and Assessment of New Target Sites for Anti-HIV Therapies

Human immunodeficiency virus (HIV) infects cells by endocytosis and takes over parts of the cell’s reaction pathways in order to reproduce itself and spread the infection. One such pathway taken over by HIV becomes the inflammatory pathway which uses Nuclear Factor κB (NF-κB) as the principal transcription factor. Therefore, knocking out the NF-κB pathway would prevent HIV from reproducing itself. In this report, our goal is to produce a simple model for this pathway with which we can identify potential targets for anti-HIV therapies and test out various hypotheses. We present a very simple model with four coupled first-order ODEs and see what happens if we treat IκK concentration as a parameter that can be controlled (by some unspecified means). In Section 3, we augment this model to account for activation and deactivation of IκK, which is controlled (again, by some unspecified means) by TNF

Hub and blade structural loads measurements of an SA349/2 helicopter

Data from 23 flight conditions, including level flights ranging from advance ratio mu = 0.14 to 0.37 and steady turning flights from advance ratio mu = 0.26 to 0.35, are presented for an Aerospatiale SA349/2 Gazelle helicopter. The data include hub loads data (for 6 of the 23 conditions), blade structural data at eleven different blade radial stations, and fuselage structural data. All dynamic data are presented as harmonic analysis coefficients (ten harmonics per rotor revolution). The data acquisition and reduction procedures are also documented. Blade structural and inertial properties are provided in addition to control system geometry and properties

Wing force and surface pressure data from a hover test of a 0.658-scale V-22 rotor and wing

A hover test of a 0.658-scale V-22 rotor and wing was conducted in the 40 x 80 foot wind tunnel at Ames Research Center. The principal objective of the test was to measure the surface pressures and total download on a large scale V-22 wing in hover. The test configuration consisted of a single rotor and semispan wing on independent balance systems. A large image plane was used to represent the aircraft plane of symmetry. Wing flap angles ranging from 45 to 90 degrees were examined. Data were acquired for both directions of the rotor rotation relative to the wing. Steady and unsteady wing surface pressures, total wing forces, and rotor performance data are presented for all of the configurations that were tested