Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Knife-edge"”.
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Propagation over knife edge obstacles on a spherical earth
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Flying between obstacles with an autonomous knife-edge maneuver
… performing a high speed (7m/s or 16 MPH) "knife-edge" maneuver through a gap that is smaller than the aircraft's wingspan. The maneuver consists of flying towards a gap, rolling to a significant angle, accurately navigating between the obstacles, and rolling back to horizontal. The speed …
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Semi-Automated Reconstruction of Vascular Networks in Knife-Edge Scanning Microscope Mouse Brain Data
The KnifeEdge Scanning Microscope (KESM) enables imaging of an entire mouse brain at sub-micrometer resolution. The data from KESM can be used in the reconstruction of neuronal and vascular structures in the mouse brain. Tracing the vascular network of the brain and reconstructing the topology …
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Velocity measurement of laser energy induced Rayleigh surface waves on bulk substrates employing the optical beam deflection (knife-edge detection) method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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The development of an optically active laser Schlieren system with application to high pressure solid propellant combustion
… aperture in place of the conventional knife edge, was developed and applied to high pressure solid propellant combustion studies. Advantages and limitations of the system are discussed. Ammonium perchlorate deflagration was observed to pressures of 2500 psi. Distinct surface reaction …
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Radijo bangų difrakcijos ir spindulių trasavimo metodų palyginimas urbanizuotose vietovėse /
… [8]. Methods used in this paper are: single knife edge diffraction, Bullington diffraction, Deygout diffraction, Geometrical theory of diffraction, Uniform theory of diffraction and the modern ray tracing technique which has its roots in graphical processing. The aim of this work is to …
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The diffraction of monsters from complex apertures
… Lamb’s ingenious solution to the classic knife-edge problem, known for over a century. Maxwell’s equations are solved for an incoming plane wave (subjectto appropriate boundary conditions on a perfectly-conducting semi-infinite screen of negligible thickness) and this building-block …
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Global Formulation and Control of a Class of Nonholonomic Systems
… examples with nonholonomic constraint i-e knife edge or pizza cutter, a circular disk rolling without slipping, and rolling sphere. For each example, the kinematics equations of the system are defined without the use of local coordinates, such that the model is globally defined on the …
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Experimental investigation of internal tide generation by two-dimensional topography using synthetic Schlieren
… and Keady's [15] super-critical solution for a knife-edge. The former was modified to account for the effects of viscosity in the propagating wave beams. The experiment set up comprised a wave-tank with a linear salt-water stratification and a sliding stage on which the topography oscillated …
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Algorithms for Generation and Tracking of Fast and Agile Flight Trajectories
… that enable highly accurate maneuvering at the edge of the vehicle’s capability. These algorithms must overcome challenges particular to fast and agile flight, such as complex dynamics effects including significant unsteady aerodynamics and challenging conditions like post-stall and …
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Characterization and application of simultaneously spatio-temporally focused ultrafast laser pulses
… imaging of single molecules. An intimate knowledge of ultrafast optical pulses, the ability to manipulate an optical spectrum and generate an optical pulse of a specic temporal shape, allows us to continue pushing these elds forward as well as open new ones. This thesis investigates the …
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A direct current differential relay
… Since the armature of the relay is balanced on a knife edge, the force of attraction between core and armature which is caused by the flux passing from one to the other will move the armature, and in so doing close a pair of contacts. A model relay was built which operates on this principle. …
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RF and GIS: Field Strength Prediction for Frequencies between 900 MHz and 28 GHz
… The model approximates diffraction using the knife-edge concept and equations proposed by Lee (1985). LOS pathways are calculated using the Bresenham algorithm and the corresponding elevations are obtained from a 30m DEM base map. The base map was generated by the procedure outlined in Rose …
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Scattering of internal gravity waves
… with those with square-wave, sawtooth and pseudo knife-edge profiles, which have discontinuous slopes. Far-field structures of scattered wavefields are compared with linear analytical models. Scatter to high wavenumbers is found to be controlled predominantly by the relative slopes and …
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Propagation and Scattering of Waves by Terrain Features
… scattering of waves. It begins with the rough knife obstruction case, moves into rough surfaces and finally concludes with several approaches to a foliage covered rough surface. Each of these problems is encountered in radar, remote sensing and communication systems. The first topic in this …
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Flexural strength and shear bond strength of self-etching/self-adhesive resin luting agents
… of time (24 hours or 90 days), and then a knife edge shear test was performed on a universal testing machine. The 90 day groups were thermocycled. A Weibull-distribution survival analysis was performed. The results revealed significant differences in the FS of all materials tested at 24 …
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Max Horkheimer, Theodor W. Adorno, . . . and C. S. Lewis? Two Revolutionary Philosophical, Moral, and Cultural Critiques
… the fate of Western civilization rests on a knife edge, while the diagnosis, prognosis, and proposed solutions they prescribe could not be more drastically different in their final analysis. The authors approach the past and present unfolding of this human drama from two radically different …
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The numerical and experimental investigation of gyro-multiplier configurations
… harmonic signal. The design and simulation of a knife-edge electron gun and kicker system has also been performed, with the final beam predicted to have a velocity spread of ~ 19%. In order to demonstrate the "cold" response of the interaction region to the 2nd harmonic signal, the design, …
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Bremsstrahlung radiation and fast electron transport in laser-plasma interactions
… length - reducing the inherent uncertainty in knife edge techniques. The foil was calibrated to ensure accurate measurements at x-ray energies > 100 keV and applied throughout the research herein to characterise the emitted profile. The first experimental chapter explores the spatial …
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The numerical and experimental investigation of gyro-multiplier configurations
… harmonic signal. The design and simulation of a knife-edge electron gun and kicker system has also been performed, with the final beam predicted to have a velocity spread of ~19%. In order to demonstrate the “cold” response of the interaction region to the 2nd harmonic signal, the design, …
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