Conventional gm-c filters have limited voltage swings in low voltage operation. CMOS companding filters replace gm-c filters in low voltage environment for high dynamic range. The square-root domain filter and log-domain filter belongs to this companding filter category. In this thesis, a second order low pass square root domain filter (SRD filter) based on the up-down TL (translinear loop) circuit structure is presented. The SRD filter consists of four geometric-mean cells and three squarer/divider cells. The advantages of the proposed circuits are low supply voltage, low power consumption, high bandwidth, and low total harmonic distortion (THD). The circuit has been fabricated with 0.35£gm CMOS technology. It operates with a supply voltage of 1.5V, and the bias current varies from 0.5£gA to 30£gA. Measurement results show that the cutoff frequency can be tuned from 3.12MHz to 8.11MHz when the Capacitance (C) is 5pF.The total harmonic distortion is 0.28%, and the power consumption is 1.09mW.

none

This dissertation is a study of the construction of meaning below the word level, specifically how roots and morphemes combine to create verbs, and the contribution of each to the meaning that a verb construes. It uses data from the verb system of Modern Standard Arabic to bring together the theory that roots combine with different structures to produce verbs describing different types of event, and the observation that many roots cannot form verbs on their own, and must combine with other morphemes do to so. The thesis is that Arabic roots lexicalize events, states or things, but remain free to create new meaning in combination with the different verb stems of Arabic, each of which contains one or more morphemes that determine the type of event that a root may come to describe. The findings are that the morphemes present in the different verb stems of Arabic condition verb meaning in four main ways: through reflexivization; through providing an Actor subject argument; through marking plural event phases; and through marking the presence of two relations construed as one event. A root combines with a morpheme that determines the type of event that a verb may describe, and it contributes meaning within the limits set by that morpheme. Thus morphemes do not modify a fixed concept, but root and morpheme create verb meaning together. The implication of this for a theory of meaning below the word level is that the semantic concepts which humans communicate remain relatively constant, but they are expressed at different levels of granularity: at the root level; by combining roots below the word level; by combining roots with morphemes below the word level; and by combining words at the clause level. This opens up avenues for further research to establish the differences, if any, between the meanings construed at these different levels of granularity. / text

published_or_final_version / Endodontics / Master / Master of Dental Surgery

No description available.

No description available.

No description available.

No description available.

This dissertation investigates the mental representation of the root in the Moroccan dialect of spoken Arabic. While morphemes like roots have traditionally been defined as the smallest unit of sound-meaning correspondence, this definition has been long known to be problematic (Hockett, 1954). Other theories suggest that roots may be abstract units devoid of phonological or semantic content (Pfau, 2009; Harley, 2012) or that words are the basic unit of the mental lexicon (Aronoff, 1994, 2007; Blevins, 2006). The root of Moroccan words is examined with auditory priming experiments, using auditory lexical decision tasks, including the subliminal speech priming technique (Kouider and Dupoux, 2005). Chapter 2 shows that the subliminal speech priming technique should be modified with primes compressed uniformly to 240ms for Moroccan Arabic (the compression rate varies to achieve the uniform 240ms prime duration).Chapters 3 and 4 apply supraliminal and subliminal speech priming technique to Moroccan Arabic. The priming effect of words that share a root are found to be robust and distinct from words which simply share semantic or phonological content. Furthermore, roots which are instantiated as novel coinages produce priming effects, which further suggests that the root is a structural unit. Each related word in a morphological family, however, does not prime all of its relatives, contradicting the idea of a root as a structural unit. These subliminal effects also differ from supraliminal effects, where overlap in phonological form between the prime and target results in facilitation when identifying the target. The results of these experiments suggest that the word is the basic unit of speech perception, rather than the root. The root is is not an mental unit but a property of words or relationship among a morphological family. Competition from phonological neighbors is a late effect, since shared phonology facilitates only with the supraliminal technique but not the subliminal technique. Finally, realizational theories of morphology are supported, since take the word as the basic unit of the lexicon. While the root may not have phonological content per se, root phonology is important for deriving morphological families. Chapter 4 uses weak roots (which do not consistently show three root consonants in each derived form) to show that semi-vowels are encoded as root consonants.

No description available.