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 63 for “"spurs"”.
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The Evolution and Development of Nectar Spurs
Nectar spurs are tubular structures usually borne from perianth tissue, which contain, or appear to contain, a floral reward such as nectar or oil. Nectar spurs have convergently evolved in many disparate angiosperm lineages, often in association with long-proboscid pollinators. The spur provides a …
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The Evolution and Development of Nectar Spurs
Nectar spurs (tubular outgrowths of a floral organ which contain or give the appearance of containing nectar) are hypothesized to be a ‘key innovation’ which can lead to rapid speciation within a lineage, because they are involved in pollinator specificity. However, given that there are no …
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Role of KNOX genes in the evolution and development of floral nectar spurs
… capable of inducing structures similar to nectar spurs in a heterologous host. Interestingly, KNOX gene expression is high in the ovary of all study taxa, suggesting that KNOX proteins may also have been involved in the evolution of this key angiosperm feature. Although principally involved in …
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Tutorial on designing and simulating a truncation spurs-free direct digital synthesizer (DDS) on a field-programmable gate array (FPGA)
… this process will generate spurious frequencies (spurs), which degrade the quality of the output signals. It is considered one of the main signal integrity issues in the DDS design. Previous research introduces a novel spurs-free truncation method for compressing the lookup table to avoid using …
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“Acid-spike” effect in spurs/tracks of the low/high linear energy transfer radiolysis of water : potential implications for radiobiology and nuclear industry
Hydronium ions (H3O+) are formed within spurs or tracks of the low or high linear energy transfer (LET) radiolysis of pure, deaerated water at early times. The in situ radiolytic formation of H3O+ renders the spur and track regions temporarily more acid than the surrounding medium. Although …
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New strategies for low noise, agile PLL frequency synthesis
… components of identical form to fractional spurs caused in quantisation process. This effect directly introduces high spurs on some channels of the synthesiser output. Numerical and analytic results describing this effect are presented and amplitude and distribution of the resulting …
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ACED: Automatic Concourse Event Detection
Fans of the San Antonio Spurs often face long delays when traversing the arena or waiting for food. Automatic Concourse Event Detection (ACED) is a novel system designed for tracking these statistics in the Spurs’ arena in real time. We use existing machine learning models and introduce novel …
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Phase noise and spur reduction in an array of direct digital synthesizers
… errors, including phase noise, phase truncation spurs, quantization noise spurs, and quantizer nonlinearity spurs. Measurements to determine the level of correlation among DDS channels were made on a custom 14-channel DDS testbed. The investigation of the phase noise of a DDS array indicates that …
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Anatomical Variations and Degenerative Features of the Coracoacromial Ligament (CAL) in Shoulders with Rotator Cuff Tears
… changes include acromial and coracoid spurs and attrition lesions at the undersurface of the acromion.<br/><br/>Results: the multiple banded ligament was the most commonly observed type and was seen in 101 (46%) specimens. The attachment sites of the ligament varied as the size or …
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An integer-N charge-pump phase-locked loop with controllable phase offset
… need to be minimized to reduce the reference spurs at the output. However, in certain applications such as multi-buses, we would like to control this offset so we can align the clock with the data. This thesis will explore the idea of controlling the phase-offset at the output of a charge-pump …
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Some factors influencing fruitfulness in apples
… study of the behavior of individual apple fruit spurs of six commercial varieties, as contrasted with previous opinions based upon casual observation of the entire tree or entire orchard, leads to the- following conclusions: - Jonathan, Grimes and Winesap possess: the ability to develop a fairly …
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Canopy light environment influences apple leaf physiology and fruit quality
… quality. Defoliation of nongirdled flowering spurs had no effect on nectar production or composition, while defoliation of girdled spurs induced nectar sugar concentration by 24%. Canopy position had no influence on nectar production or composition. At full bloom there were differences in …
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Financial System in Economic Development: The Nature and Role of a Robust Financial System in the Economic Transformation of Uganda
… Financial Model (the 3-R Financial Model), spurs the entrepreneurial revolution, offers debt and equity financing, and enhances economic transformation. It also highlights the basic conditions for the success of the 3-R Financial Model, which are awareness and attitude change, information …
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Physics of diurnal warm layers : turbulence, internal waves, and lateral mixing
… Processes in the Upper ocean Regional Study (SPURS-I). Momentum transferred from the atmosphere to the ocean through wind stress becomes trapped within the DWL, generating shear across the layer. During SPURS-I, strong diurnal shear across the DWL was coincident with enhanced turbulent kinetic …
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Physics of diurnal warm layers : turbulence, internal waves, and lateral mixing
… Processes in the Upper ocean Regional Study (SPURS-I). Momentum transferred from the atmosphere to the ocean through wind stress becomes trapped within the DWL, generating shear across the layer. During SPURS-I, strong diurnal shear across the DWL was coincident with enhanced turbulent kinetic …
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Tutorial on designing and implementing a direct digital synthesizer (DDS) on a field programmable gate array (FPGA)
… the final results and shows the unwanted spurs that are generated. Since this is purely a digital design, it does not implement a digital-to-analog converter (DAC) or a low-pass filter. Using a Virtex 6 design for the FPGA, one can achieve close to perfect sinusoids, without any phase …
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A Cornucopia Of Labeled Diagrams And Their Generating Polynomials
… between tableaux and rook boards, which spurs some further exploration of quasi-Yamanouchi tableaux as combinatorial objects of their own merit. We then move to the general polynomial ring and two of its bases, key and lock polynomials. These are each generating polynomials of certain …
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The optimal placement of switching devices on rural medium-voltage systems
… of up to 300 km of line, taking into account spurs, which makes fault detection difficult and increases customer outage time. Protective devices such as reclosers, sectionalisers and fuses are place on distribution systems to reduce the number of customers that will not have service at one …
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Fractional-N PLL-Based Waveform Synthesis for FMCW SAR
… this were identified to be ramp non-linearity, spurs and phase noise. Phase noise was the primary concern for this work since sufficient ramp linearity was achieved by the synthesiser and spurs have been addressed in another author's work on the miloSAR. Two independent synthesisers were, in …
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Primary Market Dynamic Pricing for Sports Tickets: Theory and Application
… market ticket data provided by the San Antonio Spurs. Using dynamic programming and matrix completion for modeling customer demand, we provide optimal price recommendations for all time periods before a game. We use these recommendations, along with information on current prices, to provide a …
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