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 19 of 19 for “"square-law"”.
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Nonlinear PDE and Optical Surfaces Design
… in radiometry, taking into account the inverse square law of irradiance. The problem leads to a Monge-Ampere type inequality. The surfaces in the first model are strictly convex and require to be far from the source to avoid obstruction. In the second model, the reflectors are neither convex nor …
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Characterizing The Acoustic Properties Of The Jet Lab At The National Center For Physical Acoustics
… are within the allotolerance of the inverse square law.
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Development of a test of Newton's law of gravitation at micrometer distances using a superconducting spherical torsion balance
… as string theory, predict violations of inverse square law (ISL) of gravity at sub millimetre distances. To search for such experimental signatures we developed a magnetically levitated cryogenic torsion balance, the SSTB, and a set of masses with modulated density across their surfaces. The …
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Multi-Slot Cooperative Spectrum Sensing for Cognitive Radio Networks
… is evaluated based on two decision strategies, ‘Square Law Combining' Soft fusion, and ‘Majority Rule' Hard fusion sensing. The choice of applying energy detection for local spectrum sensing is due to its efficiency and simplicity in implementation. Simulations of the modelled cognitive radio …
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Modulation techniques for GPR system radargram
… Full-Wave (AFW) and Asynchronous Real Square Law (ARSL). The Pulse Modulation (PM), Stepped Frequency Continuous Wave (SFCW) and Hybrid GPR system simulation are modeled using CST Studio Suite and MATLAB software. The selected fractional bandwidth of the GPR system simulation modeled is …
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Intrinsic degradation mechanisms of barium titanate based multilayer ceramic capacitors
… The 3/2 dependance was observed to shift to a square law behavior with degradation. This change was attributed to a increase in conductivity of the dielectric near the cathode, blunting the effect of electrode protuberances. Z5U capacitors were found to have ohmic behavior. No Schottky or Poole …
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Redução do Eletroencefalograma durante monitorização contínua de paciente crítico
… obtained by means of 2nd order Butterworth using Square Law and No Gain. Hilbert envelope resembles the original signal and highlights better the seizure segments in relation to background activity compared to Butterworth. The frequency range within 2-15 Hz can omit epileptic characteristics."
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The design, construction, and test of a simplex carrier current system
… over which the tube is operating; thus, for "square-law" or second order modulation, which occurs over the parabolic portion of the characteristic curve, n = 2; for third order modulation, n = 3; etc.
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Distribution-independent hierarchical N-body methods
… of mutual force fields based on an inverse square Law; The problem has applications in several domains including astrophysics, molecular dynamics, fluid dynamics, radiosity methods in computer graphics and numerical complex analysis. Research efforts have focused on reducing the …
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Path-integral analysis of passive, graded-index waveguides applicable to integrated optics
… geometries considered are the general power-law geometry, the linear, parabolic, inverse-square-law, and exponential tapers. Closed form expressions describing the propagation of a centred Gaussian beam in these tapers have also been derived. The approximate propagator of two parallel, …
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Passive gust load alleviation through bend-twist coupling of composite beams on typical commercial airplane wings
… such as the 777 due to the effects of the cube-square law.
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Limitations and Improvement of Subcarrier Multiplexed Systems over Optical Fiber
… detection of the subcarrier system using a square-law photodetector. Using a modified optical local oscillator to coherently detect the subcarrier channel this power fading can be eliminated. An optical local oscillator is centered at the optical carrier in order to perform homodyne …
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Interband quantum tunneling at the band-edges in III-V semiconductor heterojunctions for low-power logic and detectors
… as well as nonlinear analog components such as square-law detectors. In the former application, density-of-states switching can potentially allow for transistor subthreshold slopes steeper than the room-temperature thermal limit of 60 mV/decade in a device known as a tunnel field effect …
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Correlator for a Basis-Space Architecture Ultra-Wideband Receiver
… for the 0.13$um RF process showed that square-law assumptions were not valid for constructing circuits. Instead, a design point approach was used. Individual circuits in the initial implementation are detailed in the thesis and include a wide bandwidth two stage op-amp and a …
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Novel opto-electronic and plastic fibre sensors
… and differential sensor based on the inverse square law and is insensitive to source intensity variations. It can, in principle, be implemented using only opto-electronic components or it can incorporate optical fibres to allow for EMI free and remote operation. The sensor is implemented using …
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Effects of solar particle events on Geospace
… and recombination process should deviate from a square law, there is actually no evidence for this in the observations. The D- and E-region effects of a co-rotating interaction region associated with the meridional crossing of a trans-equatorial coronal hole during late June 2005 have been …
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The consequences and implications of ecology on body size distributions in social insects
… is growing interest in co-opting Lanchester’s laws, originally designed for human warfare, to predict the outcomes of aggressive interactions in ants. In Chapter Four, I use a foraging experiment and field surveys to test the predictions of Lanchester’s laws in interference competition with the …
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Settling-Time Improvements in Positioning Machines Subject to Nonlinear Friction Using Adaptive Impulse Control
A new method of adaptive impulse control is developed to precisely and quickly control the position of machine components subject to friction. Friction dominates the forces affecting fine positioning dynamics. Friction can depend on payload, velocity, step size, path, initial position, temperature, …