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 24 for “"Low-IF"”.
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Isolation and characterization of cytochrome P450s from Papilio polyxenes and Papilio glaucus
… amounts of linear furanocoumarins and low, if any, amount of angular furanocoumarins. The polyphagous Papilio glaucus rarely encounters furanocoumarin-containing plants and yet it contains low constitutive levels of cytochrome P450s capable of metabolizing furanocoumarins, which …
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Human Health Risk Assessment for Petroleum Refining Industry of the Remaining Air Toxics after MACT I Emissions Reductions
… applying EPA criteria, where cancer risks are 'low' if the probability is. 1/1, 000, 000, and non-cancer risks are harmful when hazard quotient is > 1. It was demonstrated that fugitive emissions have more impact on human health than the verticals because of their significant portion of the …
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Conceptual relations of architecture, painting, color, and education and their application in an elementary school
If the theories of Piaget (stages of cognitive development) and Bruner (anything can be taught to anyone as long as it is taught in their language) are combined and applied to an elementary school the resulting conclusion is very quickly hands-on learning. Or, more simply, elementary-aged children …
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Mobility modeling and management for next generation wireless networks
… to as the level of mobility, such as "high" or "low" mobility. This dissertation presents an information theoretic approach to mobility modeling and management, in which mobility is considered as a measure of uncertainty in mobile's trajectory, that is, the mobility is low if the trajectory of a …
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BPSK system analysis using MEMS filters
… These small filters are post-CMOS compatible, allowing hundreds of high-Q filters to be incorporated over a typical RF transceiver die. Selection of these filters allows the band, channel, and bandwidth to be rapidly changed in operation. Having integrated Microelectromechanical Systems (MEMS) …
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Design and Characterization of RFIC Voltage Controlled Oscillators in Silicon Germanium HBT and Submicron MOS Technologies
… striving for market acceptance, requiring low-cost, low-power, and compact solutions. One approach to meet these demands is system-on-a-chip (SoC) integration, where RF/analog and digital circuitry reside on the same chip, creating a mixed-signal environment. Concurrently, there is …
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Radio frequency digital to analog converter
… energy to a higher frequency. An image of a low IF input signal can therefore be output directly at a high IF or RF frequency for transmit communications applications. A narrow-band sigma-delta DAC with eight unit elements is chosen to demonstrate the radio frequency digital-to-analog …
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RF hardware design of a stepped frequency continuous wave ground penetrating radar
… by the University of Stellenbosch for the specific use of ground penetrating radar. Measurements with the first generation system proved the concept of SFCW GPR and thus a dedicated second generation system was planned. A SFCW GPR system was designed to replace the first generation system. …
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Algorithms for verifying the integrity of untrusted storage
This work addresses the problem of verifying that untrusted storage behaves like valid storage. The problem is important in a system such as a network file system or database where a client accesses data stored remotely on an untrusted server. Past systems have used a hash tree-based checker to …
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What is holding back women from reaching CEO positions in Iceland? : does it depend on company size?
… the ratio of female CEOs remains tremendously low. If the ratio of female CEOs in Iceland is analyzed a pattern rises, the number of female CEOs decreases with the increased size of the company. Understanding why the ratio of women in the position of CEO is so low and what assembles the pattern …
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The Role of Backreef Soundscapes and their Spatial Structure for Recruitment of Tropical Marine Larvae
… sound over such a large area allowed me to experimentally test in situ the response of fish and invertebrate larvae to broadcasted sounds at different distances from their source. I first measured sound recording from healthy hardbottom habitat at seven distances from an …
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Motivation, Trust, Leadership, and Technology: Predictors of Knowledge Sharing Behavior in the Workplace
… is a critical resource for the organization, and if it is not shared, it is lost to other employees and the organization. However, knowledge sharing (KS) does not happen easily; KS is a personal choice that cannot be forced. This study employs Self-Determination Theory (SDT) as a theoretical …
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Architecture and design of an RF receiver front-end and transmitter for wireless sensor networks, healthcare and smart energy systems
… utilizing RF transceivers which consume the lowest possible energy. The thesis focuses on the architecture, design, implementation and evaluation of an RF transmitter and receiver front-end which are part of the foundations of a commercial RF system on a chip. The use of a number of …
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The influence of probability of detection when modeling species occurrence using GIS and survey data
… of habitat models created from data of differing reliability. Because the reliability is dependent on the probability of detecting the species, I experimented to estimate detectability for a salamander species. Based on these estimates, I investigated the sensitivity of habitat models to …
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The geochemistry of late Precambrian weathering profile northwest Scotland
… place at the present time, samples weathered to different degrees have been taken at various distances immediately below the Cambrian Unconformity. These samples have been subjected to chemical analysis by X-ray fluorescence spectometry and wet analysis, and to mineralogical analysis by X-ray …
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Regional integration in SADC: the role of BRICS countries
… SADC countries are not compatible with the specified targets for SADC regional economic integration. While Russia and Brazil are BRICS countries with low trade volumes within SADC region, China has the largest portion of bilateral trade with SADC region. This investigation also found that it is …
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Low-Power RF Front-End Design for Wireless Body Area Networks
… a meager amount of power consumption poses significant design challenges. In order to address these issues, IEEE has recently developed a draft of IEEE 802.15.6 standard dedicated to low bit-rate short-range wireless communications on, in, or around the human body. Commercially available SoC …
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Modeling and design of digital current-mode constant on-time control
… DPWM (Digital Pulse Width Modulator) model is verified in simulation, which shows what effects the digital control brings to the conventional Pulse Width Modulator. In CPES, the constant on-time control concept is introduced into the digital control of the voltage regulator module. This provides a …
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Comportamiento de vigas hiperestáticas de hormigón armado corroídas y reparadas con mortero : pérdida de propiedades mecánicas del acero de refuerzo y fisuración del recubrimiento de hormigón por corrosión
… La durabilidad se puede ver afectada por diferentes deterioros ya que el hormigón es permeable a líquidos y gases. Una de las principales causas del deterioro prematuro de las estructuras de hormigón es la corrosión de las armaduras. Dado que el proceso corrosivo supone la disolución del …
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A 5-6 Ghz Silicon-Germanium Vco With Tunable Polyphase Outputs
… architectures, such as direct conversion or low-IF, either for vector modulation and demodulation, negative frequency recovery in direct conversion receivers, or image rejection. If imbalance between the I and Q channels exists, the bit-error-rate (BER) of the transceiver and/or the image …
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