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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 131 for “"pulsing"”.
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The S-Process in Thermally Pulsing Stars
… environment: intermediate mass, thermally pulsing stars. A superficial study of the physical conditions of such stars appears to indicate a neutron environment inconsistent with the production of s-process nuclei with the relative abundances which are observed in the Solar System. This …
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Computational neutronics analysis of TRIGA reactors during power pulsing
Training, Research, Isotopes, General Atomics (TRIGA) reactors have the unique capability of generating high neutron flux environments with the removal of a transient control rod, creating conditions observed in fast fission reactors. Recently, several TRIGA reactors have had issues with the …
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Optimized pulsing of high-intensity focused ultrasound for enhanced therapeutic window
High intensity focused ultrasound (HIFU) provides a unique modality to perform non-invasive surgeries. The thermal ablation technique relies on focusing the non-ionizing acoustic wave within soft tissues to produce a small lesion. HIFU operations are typically attempted by continuous-wave (CW) …
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Pressure Pulsing Potential During Waterflooding and CO2 Flooding of Heavy Oil Reservoirs
… unfriendly and expensive. Pressure Pulsing Technology (PPT) does not change the properties of the hydrocarbons or reservoir, it changes the flow behavior and displacement mechanism. PPT has traditionally been used during waterflooding, but due to positive results of heavy oil …
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Cycled Pulsing for Prostate Tumor to Mitigate Thermal Damage, While Conserving the Ablation Area
… of Joule heating exists during treatment. Cycled pulsing of IRE is a technique to mitigate thermal damage through partitioning of pulses and adding interpulse delays. The purpose of this thesis was to investigate the effects of segmenting the pulses and adding delays to regular IRE pulse schemes …
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Development of an on-demand beam pulsing system for Pixe-analysis of thick targets
… facility. The characteristics of the beam pulsing system and its counting rate capabilities were evaluated by observing the ion-induced X-ray emission from pure thick copper targets, with and without beam pulsing operation. The characteristic X-rays were detected with a high resolution …
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Nano- and Micro-Second Electrical Pulsing of B16-F10 Mouse Melanoma Cells: Plasma Membrane and Sub-Cellular Organelle Changes
… membrane and organelle changes immediately after pulsing with high voltage electric field application. Different pulse durations, nanosecond (ns) and microsecond (µs), and field magnitudes, 60 kV/cm and 1.2 kV/cm, were applied to mouse melanoma B16-F10 cells. Two different ns durations (60 and 300 …
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The Application of The Kinetics Equations Solved in Temperature to The Short-Interval Series Pulsing of a Triga Reactor
Made available in DSpace on 2014-12-09T19:52:26Z (GMT). No. of bitstreams: 1 6901377.pdf: 8056283 bytes, checksum: a622b576fe592d8ef8e6fc72282b58a3 (MD5) Previous issue date: 1968
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The reduction of supersonic jet noise using pulsed microjet injection
… increases with duty cycle. In particular, for pulsing at a 50% duty cycle, pulsing achieves comparable noise reduction as compared to steady injection at all of the temperatures tested while using only 66% of the mass flow rate. The most dramatic result was achieved at 17000F for pulsing at a …
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Focused Ultrasound Methods for the treatment of Tendon Injuries
… of work that includes the development of FUS pulsing to precisely target murine Achilles tendons and emphasize distinct bioeffects (thermal-dominant and mechanical-dominant). We investigated the feasibility of applying FUS pulsing to murine Achilles tendons ex vivo and in vivo and demonstrated …
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Deep structure ultrasound imaging using fundamental and third harmonic coded excitation techniques
… experiments were conducted using conventional pulsing, 1, 3 chirp compounding, 1, 3 REC compounding, and Golay codes with a 1, 3 REC compounding chip. The first experiment tested the ability to image small differences in positive and negative contrast targets. Golay coding with 1, 3 REC …
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Longevidade de Heliconia psittacorum x H. spathocircinata 'Golden Torch' e H. bihai em resposta ao uso de reguladores de crescimento.
… e do aminoetoxivinilglicina (0, 1, 2 e 4 mg L-1; pulsing por 18 horas) na senescência de Heliconia psittacorum x H. spathocircinata Golden Torch e de Heliconia bihai, bem como estudar o efeito da benziladenina (0, 200, 300 e 400 mg L-1; pulverização ou pulsing por 18 horas) e do ácido giberélico …
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Investigation of Histotripsy Cavitation and Acoustic Droplet Vaporization From Perfluorocarbon Nanoparticles
… of these nanoparticles with different pulsing parameters such as cycle number and frequency in order to better predict and understand the mechanisms underlying NMH. In this thesis, I investigate the ability of new nanodroplets and nanocone clusters to reduce histotripsy cavitation …
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An Assessment of Community-Scale Electrodialysis Desalination Systems and Improved Scale Mitigation through Pulsed Operation
… heavily relies on the appropriate selection of pulsing parameters. The effects of these parameters on desalination rate and energy consumption were first investigated in the absence of scale precipitating components. The theoretical and experimental results indicate that pulsed operation …
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An Experimental Study of Transient Flows in Pulse Combustors
… concluded that combustor displayed the steady, pulsing and flame-out modes. The pulse combustor behaved just like any other combustion engine in terms of its efficiency with respect to ambient temperature and pressure. It was deduced that the inlet pressures dictated the achievement of the …
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Real-time characterization of transient dynamics in thulium-doped mode-locked fiber laser
… transition dynamics between consecutive multi-pulsing states through adjusting pump power with a constant rate in an erbium-doped fiber laser, specifically the build-up and annihilation of soliton pulses between a double pulsing and a three-pulse state utilizing DFT. To investigate real-time …
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Active noise control of supersonic impinging jet using pulsed microjets
… were introduced; one with a rotating cap, pulsing at 16 - 100Hz, and the other developed based on the principle of Hartmann tube, pulsing at 4.4 - 6.1kHz, referred to as high frequency actuator. Control parameters related to pulsed microjet injection with rotating cap were varied to …
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Design of mechanical arterial simulator
… can be independently controlled to simulate the pulsing of a real human heart. Measurements were taken of the force applied to the probe for static pressures to demonstrate the force varying linearly with pressure. Further measurements were taken with fluid flowing through the vessel at various …
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Investigation of the regulatory interactions and dynamics between the circadian clock and sigma factors in the cyanobacterium Synechococcus elongatus
… We then investigated the mechanism of rpoD4 pulsing at cell division and its potential function. Using promoters of different lengths we showed that the cis-regulatory elements of rpoD4 transcription are located within 100 bp upstream of its start codon. In addition, deletion of each …
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Sources of thermally generated vacancies in single-crystal and polycrystalline gold
… studied and least understood. The electrical pulsing work of Jackson (1960), Lund (1964) and Koehler (1960, 1964) pioneered the study of vacan¬cy generation at high temperatures, when a lattice is subjected to a sudden and large subsaturation of vacancies. Their experiments indicated that …
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