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 29 for “"Frequency variation"”.
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Multiple voltage scheme with frequency variation for power minimization of pipelined circuits at high-level synthesis
High-Level Synthesis (HLS) is defined as a translation process from a behavioral description into structural description. The high-level synthesis process consists of three interdependent phases: scheduling, allocation and binDing The order of the three phases varies depending on the design flow. …
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Mitigating variability in HPC systems and applications for performance and power efficiency
… of HPC systems include thermal, power, and frequency variations among processors. Smart and adaptive runtime systems have great potential to handle these challenges transparently from the application. In this dissertation, I first analyze frequency, temperature, and power variations in …
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Fault location on EHV lines using wideband spread spectrum techniques
… on a digital computer taking into account the frequency variation of the PLC interface and line parameters over the spread spectrum bandwidth. The effect of waveform characteristics, fault location and resistance are examined for a 100 km double transposed line with a single phase to ground …
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Design techniques for temperature insensitive, low phase noise oscillator
… against temperature, voltage and process variation. However, due to incompatibility with silicon integration and high power consumption, they are not suitable for biomedical devices which require long battery lifetime, low cost and especially small size but do not require near-crystal …
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Development of switchable planar reflectors for beam shaping realization
… of planar reflectors within X-band and Ku-band frequency ranges. The objective of this work was to investigate the feasibility of using strategic slot embedded patch element configurations for an efficient reconfigurable reflectarray antenna design. PIN diodes were incorporated with single and …
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Zero Voltage Switching (ZVS) Turn-on Triangular Current Mode (TCM) Control for AC/DC and DC/AC Converters
… filters can be reduced by pushing the switching frequency higher. High frequency operation (> 300 kHz) leads to a size in reduction of EMI filters though it also leads to an increase in switching losses thus compromising on efficiency. Thus, soft switching becomes necessary to reduce the losses, …
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Force-induced calcium concentration change and focal adhesion translocation : effects of force amplitude and frequency
… to basal surface focal adhesion sites. Frequency variation between 0.1 and 50 Hz altered focal adhesion translocation and
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Padrão vocal de reconhecimento específico em Troglodytes musculus (Aves: Passeriformes: Troglodytidae) no Rio de Janeiro
… of the song of T. musculus and quantified the variation of some of its acoustic properties, in order to look for those possibly responsible for transmitting that species-specific information. Two very distinct parts may be recognized in this species' song. The first (and significantly longer) …
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A characteristic mode perturbation approach for antenna loading design
… of characteristic modes with respect to frequency or reactive loading are currently understood only qualitatively, and insight into their behavior must be developed through experience. In this thesis, a novel characteristic mode perturbation approach is developed that provides a …
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Investigation of selective optical properties of Si/SiO2 nanostructures generated by pulsed laser ablation as-deposited and post-treated
… of the effect of manufacturing parameters as frequency, power, pulse duration and scanning speed on optical properties of samples generated. By and large, an increase in the values for repetition rate and scanning speed produces a corresponding increase in optical data intensity, while an …
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Hydrogen Permeation Through Nickel And Nickel Alloys: Surface Reactions And Trapping
The frequency variations of attenuation and phase lag of the modulated gas flow through thin metal foils have characteristic features whether permeation is diffusion controlled, is influenced by surface reactions or affected by internal trapping.<br></br><br></br>Analysis of data obtained for …
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Integrated realizations of reconfigurable low pass and band pass filters for wide band multi-mode receivers
… the filters can exhibit low pass or band pass frequency responses.The idea of reconfigurable frequency parameters has been introduced since the beginning of modern filtering applications due to the required precision of the frequency response. However, the reconfiguration of the parameters was …
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Investigating the effects of genetic variation on heterochromatic crossover events in Arabidopsis thaliana
… control of heterochromatic meiotic crossover frequency by natural genetic variation. Genome-wide effects on crossover frequency were evaluated using natural variation and biotic stress. Significant crossover frequency variation was recorded throughout the genome in Col- 0/relict F1 hybrids. A …
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Understanding Inflammatory Bowel Disease using High-Throughput Sequencing
… identified, largely driven by common genetic variation. Now, with the advent of next-generation sequencing technology, we are able to interrogate rare and low frequency variation in a high throughput manner for the first time. This provides an exciting opportunity to investigate the role of …
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Combined-channel instantaneous frequency analysis for audio source separation based on comodulation
… indicates that detecting common amplitude and frequency variation in acoustic signals plays an important role in the separation process. The physical mechanisms of sound generation in many sources cause common onsets/offsets and correlated increases/decreases in both amplitude and frequency …
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Development of a Plasma Spray Process Monitoring System through Aeroacoustic Signal Analysis
… In this application coating material property variation has a significant cost. In addition to the variation inherent in the process, some of the biggest contributors to coating property variation have been traced to spray gun nozzle wear and powder feed variation[3, 4]. Presented here are …
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Frequency Locking Techniques Based on Envelope Detection for Injection-Locked Signal Sources
Signal generation at high frequency has become increasingly important in numerous wireline and wireless applications. In many gigahertz and millimeter-wave frequency ranges, conventional frequency generation techniques have encountered several design challenges in terms of frequency tuning range, …
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Analysis of noun + noun sequences in discipline-specific published research articles
… research has primarily focused on how the frequency of noun+noun sequences vary across disciplines (Gray, 2015). However, there is a lack of research documenting other characteristics of noun+noun sequences in discipline-specific writing and no pedagogical list of noun+noun sequences. This …
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Derivation of Parabolic Current Control with High Precision, Fast Convergence and Extended Voltage Control Application
… hysteresis current control has a wide switching frequency range, which introduces additional switching loss and impacts the design of harmonic filter. Other nonlinear current control strategies include one-cycle control, non-linear carrier control, peak current control, charge control, and so on. …
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Automatic operational modal analysis: challenges and applications to historic structures and infrastructures
… based on the inspection of any irreversible frequency variation. To such purpose, it is mandatory an extensive correlation study with environmental and operational factors which affect the frequency of the vibration modes. Conversely, one of the proposed strategy aims to use alternative …
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