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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 4322 for “"modulation"”.
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Studies of Rectangular-Wave Modulation and Pulse-Interval Modulation Systems
Rectangular-wave modulation (RWM) and pulse-interval modulation (PIM) systems were first reported in 1966 and 1967 respectively. Both RWM and PIM are asynchronous pulse modulation schemes. The two modulators are self-oscillating and produce a zero-signal output in the absence of any modulation. The …
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Modulation informational masking
… variations in amplitude across time (amplitude modulation or AM) inherent to many behaviorally relevant sounds are of fundamental importance to auditory perception and communication. This is true for listeners with normal hearing, listeners with hearing loss, and, in particular, for listeners …
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Generalized frequency modulation
In frequency modulation (FM) systems, a continuous-time information signal is modulated onto a sinusoidal carrier wave by using the information signal to modulate the frequency of the carrier wave. In this thesis, a more general type of modulation is developed, of which FM is a special case, that …
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Fractal Modulation and Encryption
… in digital transmission systems. Fractal coding modulation is used to camouflage transmission in which Random Scaling Fractal Signals are used for simulating background noise. This form of 'data camoulaging' is important in the transmission of sensitive information (in military communications …
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Efficient frequency modulation systems
[114] leaves. 2 reprints
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Serotonergic modulation of cognition
Action control arises from the interaction of two anatomically distinct decision-making systems, namely goal-directed and habitual behaviour. Goal-directed behaviour is characterized by the consideration of future choices and respective outcomes whereas habitual responding is driven by …
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Absorbance modulation optical lithography
In this thesis, the concept of absorbance-modulation optical lithography (AMOL) is described, and the feasibility experimentally verified. AMOL is an implementation of nodal lithography, which is not bounded by the diffraction limit of incident lights. Experimental results showed promising …
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GRAND-assisted Optimal Modulation
… peak and average power constraints the optimal modulation (OM) schemes are known to have nonuniform probability distributions over the signal points. An established way to obtain these distributions is assigning different number of bits to different constellation points. However, this method …
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Space vector pulse-width modulation for multilevel inverters and solution to modulation dependent problems
The Space vector PWM (SVPWM) is a prominent modulation technique for multilevel inverters similar to two-level inverters. However, due to complex geometry of the space vector diagram and a large number of switching states, the implementation of SVPWM for multilevel inverters is considered complex. …
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Linearity of some modulation circuits.
… of a detailed study of the methods of analogue modulation and demodulation of electrical carrier waves by amplitude and frequency, with the object of presenting improved techniques where necessary. The thesis is divided into five parts, of which the last is devoted to the conclusions. The first …
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Maternal Modulation of Neonatal Immunity
<p>Although the neonatal immune system is functionally immature, immune response capabilities are not the same in all newborns. The objective of this thesis was to determine development of immunocompetence and test the hypothesis that activation of maternal inflammatory immunity during pregnancy …
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Antigenic modulation in Bordetella pertussis
Summary available: p. ii.
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Affective Modulation of Executive Control
<p>Emotions are pervasive in daily life, and a rich literature has documented how emotional stimuli and events disrupt ongoing processing and place heightened demands on control. Yet the executive control mechanisms that subsequently resolve that interference have not been well characterized. …
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Pulse Time-Code Modulation System
In conventional systems of pulse-code modulation (PCM), the signal is sampled at a constant frequency, and pulse groups representing the signal amplitude are transmitted. The sampling frequency has to be related to the highest frequency in the signal; consequently, the sampling frequency is higher …
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Pulse time-code modulation system
… The new method has been called pulse time-code modulation (PTCM).The sampling in PTCM is achieved by dividing the full range of the signal amplitude into quantizing levels. When the signal crosses one of these levels the time measurement starts. It continues until another crossing of the …
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Deflection Modulation and Millimeter Waves
Made available in DSpace on 2014-12-04T21:03:37Z (GMT). No. of bitstreams: 1 6402857.pdf: 2471312 bytes, checksum: b0d1124420068782440971a01354bcb7 (MD5) Previous issue date: 1963
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Surface acoustic wave optical modulation
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Velocity modulation of electromagnetic waves
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1956
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Environmental modulation of microbial communities
Microbial communities are crucial to the health of all ecosystems, and their vast diversity constitutes the majority of species on Earth. A single sample of such a community immediately reveals its complexity, but simultaneously the challenges to understanding its form and function. First, a sample …
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Magnetothermal Modulation of Nerve Growth
… provide several mechanisms for wireless neuromodulation. MNPs under applied AC magnetic fields (AMFs) exhibit hysteresis loss, which can activate heat-sensitive ion channels such as TRPV1. This magnetothermal modulation requires AMFs with peak field strengths of up to 40 kA/m and frequencies …
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