Two-dimensional, supersonic mixing of hydrogen and air near a wall

Two dimensional, supersonic mixing of hydrogen injected from wall slot into airstrea

Application of two-dimensional unsteady aerodynamic to a free-tip rotor response analysis

The free-tip rotor utilizes a rotor blade tip which is structurally decoupled from the blade inboard section. The tip is free to pitch about its own pitch axis to respond to the local flow angularity changes. The tip also experiences the heaving motion due to the flapping of the rotor blade. For an airfoil in any pitching and heaving motion which can be expanded into a Fourier series, the lift and moment calculated by Theodoren's theory is simply the linear combination of the lift and moment calculated for each harmonic. These lift and moment are then used to determine the response of the free-tip rotor. A parametric study is performed to determine the effect of mechanical damping, mechanical spring, sweep, friction, and a constant control moment on the free-tip rotor response characteristics and the resulting azimuthal lift distributions. The results showed that the free-tip has the capability to suppress the oscillatory lift distribution around the azimuth and to eliminate a significant negative life peak on the advancing tip. This result agrees with the result of the previous analysis based on the steady aerodynamics

Courts and Executives

William Howard Taft was both our twenty-seventh president and the tenth Chief Justice of the U.S. Supreme Court -- the only person to have ever held both high positions in our country. He once famously commented that presidents may come and go, but the Supreme Court goes on forever (Pringle 1998). His remark reminds us that presidents serve only four-year terms (and are now limited to two of them), but justices of the Supreme court are appointed for life and leave a legacy of precedent-setting cases after departing the High Court. Of course, presidents also leave a legacy of important decisions, not the least of which being their appointment of federal judges. [excerpt

Barrows in the cultural imagination of later Medieval England

When history has gone beyond memory, and where there is little or no written record, then objects in the landscape are used and interpreted in order both to understand the past, and to tie the past to the present. This thesis explores the places of barrows in the cultural imagination of later medieval England, following the interdisciplinary approaches of Sarah Semple (Perceptions of the Prehistoric in Anglo-Saxon England: Religion, Ritual, and Rulership in the Landscape, 2013) and Anwen Cooper (Other Types of Meaning: Relationships between Round Barrows and Landscapes from 1500 BC-AC 1086, 2016). This thesis identifies and examines a range of historical sources to explore an area of research which has not previously been studied in depth. Whilst it is the case that barrows appear in texts relatively infrequently during the later medieval period, this thesis argues that these references were included specifically because they had significance and meaning both for the writer and the intended audience. Those writers who included barrows in their work anticipated that their intended audience would be able to recognise them, and to be aware of their significance. The intended audience for many of the texts discussed in this thesis was primarily aristocratic elites and the clergy, and therefore the texts speak to their interests and concerns, with barrows often being connected to themes of exemplary kingship. The past is also used to talk about the present; here barrows become symbols of the past, both ‘historic’, and at times mythical, having links to the supernatural. They act as focal points through which wider, contemporary issues can be explored, thus allowing authors access to the past and to a landscape onto which they can project the concerns of the present, and therefore talk about them more freel

The determination of the topological structure of skin friction lines on a rectangular wing-body combination

A short tutorial in the application of topological ideas to the intepretation of oil flow patterns is presented. Topological concepts such as critical points, phase portraits, topological stability, and indexing are discussed. These concepts are used in an ordered procedure to construct phase portraits of skin friction lines with oil flow patterns for a wing-body combination and two angles of attack. The relationship between the skin friction phase portrait and planar cuts of the velocity field is also discussed

The generation of a Gaussian random process in a position parameter

Analog computer method for approximating stationary Gaussian random process depending only on position paramete

Geometry requirements for unsteady aerodynamics in aeroelastic analysis and design

Aircraft geometry requirements for unsteady aerodynamic computations are discussed and differences between requirements for steady and unsteady flow are emphasized within the framework of a general potential-flow aerodynamic formulation. Its implementation in a computer program called SOUSSA (Steady, Oscillatory, and Unsteady Subsonic and Supersonic Aerodynamic is detailed

Brushless d.c. torque motor first quarterly report, 25 jun. - 25 sep. 1964

Brushless direct current torque moto