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 36 for “"point-by-point"”.
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Point by point gain calibration of the Dark Matter Time Projection Chamber
… of dark matter. Once a simple proposition by Fritz Zwicky to explain discrepancies in the virial motion of galaxy clusters, dark matter can now explain galactic rotation curves, the hierarchical structure of the universe, and the gravitational lensing of the bullet cluster. Nonetheless, the …
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Investigation of Bragg Gratings in Few-Mode Fibers with a Femtosecond Laser Point-by-Point Technique
… In particular, with femtosecond (FS) laser point-by-point (PbP) inscription technique which opens up a unique possibility to explore the HOMs for device innovation, we design, fabricate, and characterize novel-structured fiber Bragg gratings (FBGs) written in the step-index two-mode fibers. …
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Inscription of in-fibre photonic devices by an infrared femtosecond laser
In this work, a point by point method for the inscription of fibre Bragg gratings using a tightly focused infrared femtosecond laser is implemented for the first time. Fibre Bragg gratings are wavelength-selective, retro-reflectors which have become a key component in optical communications as well …
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An analysis of defence policies. Nuclear and non-nuclear options reviewed.
… I pp 7-30) . The two rationales are then related point by point , to give the analytical framework used in the subsequent interviews (pp 31-9) . Each pair of points is expanded and commented upon , and detailed references are given to the books and articles from which the analysis was drawn (pp …
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TOWARDS A POINTAL ECCLESIOLOGY: ZIZEK AND BADIOU IN THEOLOGICAL CONVERSATION
… understanding of “faithful subject,” followed by an examination of Slavoj Zizek’s materialist theology, undertaken with a view to what they can say to inform the modem Western Church. Though the thrust of their work is primarily political and ethical in nature, Zizek and Badiou will be drawn …
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Accuracy of Automated Analysis of Language Samples from Persons with Deafness or Hearing Impairment
… analysis was then performed on the samples. Point-by-point accuracy for DSS and for each level of LARSP was reported. Characteristics of the participants' language at the clause, phrase, and word levels were described and discussed, including the implications for clinicians working with this …
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Measurements of Surface Displacements During Stress Wave Propagation in Opaque Solids Using Pulsed Laser Speckle Photography
… The system consists of combining a pulsed ruby laser source and an optical speckle photography recording scheme. The set-up is capable of measuring surface displacements due to stress waves and propagating cracks in solids. A double exposure recording allows the comparison of object points to …
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Thermionic emission from a recrystallized tungsten filament
"A projection diode similar to the one developed by Gardner (]6) was constructed to measure the point-by-point thermionic emission parameters of a tungsten single crystal with {110} zone 8° to 10° off filament axis. Pecrystallization of the filament was achieved by the Robinson (27) method of …
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An acoustic bubble density measurement technique for surface ship waters
… Pump Method of acoustically determining point by point bubble cloud densities was studied to determine the practicality of using this acoustic technique to determine bubble densities in surface ship wakes. The dual frequency technique of acoustically detecting bubbles utilizes a high and …
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Lattice Boltzmann Methods for Diffuse and Mobile Interfaces
… LB models are formulated and validated through point-by-point comparison with limiting benchmark flows. Finally, the modified LB models are used to study a complex swirling flow in the strongly non-linear regime and to elucidate the physics of vapor-liquid flows near the critical point. The …
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Memory for structural information across eye movements
… time. To compensate, the eyes move around from point to point in space, and can be directed to objects or regions of interest. Since information is picked up from the world only during eye fixations, these intervening eye movements (i.e., saccades) disrupt the inflow of information, thereby …
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A pneumatic conveying powder delivery system for continuously heterogeneous material deposition in solid freeform fabrication
… additive building process, building parts layer-by-layer or even point-by-point, adjusting material composition throughout the entire part, in all three dimensions, is feasible. The use of fine powders as its build material provides the potential for the Selective Laser Sintering (SLS), …
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Accuracy Of Parental Report On Phonological Inventories Of Toddlers
… SSD and data from the 20-minute speech sample. A point-by-point reliability analysis of the speech sounds on the SSD compared to those produced in the speech sample revealed an overall parental accuracy of 75%. Further, no differences were found between parent reports and transcribed accounts for …
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Development of a scanning system for use in the Terahertz region of the Electromagnetic Spectrum
… the Electromagnetic spectrum. The approach used by the prototype developed, utilises two tilting mirrors for the purposes of scanning a target under investigation. An object is scanned by tilting an incident beam of radiation to a point of interest on the target, on this basis an image can be …
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Economic and technological advantages of using high speed sintering as a rapid manufacturing alternative in footwear applications
… Selective Laser Sintering, only allows for a point-by-point sintering process to construct the 3D representations of CAD models. This makes for long processing periods and is ineffective for high volume manufacturing. However, a new process called high-speed sintering uses infrared energy to …
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Fabrication of intensity-based Long-Period-Gratings fiber sensor with CO2 Laser
… long period grating (LPG) fiber sensors with point-by-point irradiation under a CO2 laser beam. The type of fiber sensor under examination is desirable to be highly sensitive to the variation of the thickness and refractive index of a thin film deposited on the LPGs, making it a promising …
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Volumetric additive manufacturing of polymer structures by holographically projected light fields
… and overhang elements). Moving beyond point-by-point and layer-by-layer approaches, the ability to generate a complex 3D volume as a unit operation has the potential to overcome these limitations. Since holography has been extensively studied as a means for storage and retrieval of 3D …
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High resolution interferometric measurements of residual strains in composites
… of local deformation of composites on a ply·by-ply basis, or give point-by-point and averaged information. Also they are incapable of resolving the complexity of combined effect of different residual stress components. I n order to measure residual strains more effectively, a new method of …
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Optical Coherence Sensors in Multimode Fibers
… sensors in MMFs. With the femtosecond laser point-by-point inscription method, parallel fiber Bragg gratings (pFBGs), scattering array interferometers (SAIs), and densely multiplexable scattering array interferometers (DMSAIs) in sapphire fibers are proposed, fabricated and characterized, …
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Development of a Platform for Surface Enhanced Raman Scattering Endoscopy
… improvement in local recurrence rates. By performing such early-stage resections endoscopically, patients may benefit from lower morbidity rates as compared to traditional open approaches. Molecular imaging using surface enhanced Raman scattering (SERS) nanoparticles represents a …
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