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 124 for “"energy deposition"”.
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Laser Finishing of Components by Directed Energy Deposition
L'abstract è presente nell'allegato / the abstract is in the attachment
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Wire Direct Energy Deposition of Cobalt Iron Alloy
… research explores the Wire-Laser Direct Energy Deposition of Fe17Co alloy for soft magnetic applications. Process parameters starting from power, feed speed, and feed/scan ratios were optimized where a high confidence multi-factor regression model was developed correlating the processing …
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Laser Directed Energy Deposition for Processing and Repairing Steels
L'abstract è presente nell'allegato / the abstract is in the attachment
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Directed Energy Deposition Additive Manufacturing Supplier Sourcing for Aerospace
… P&W wants to explore the potential of Directed Energy Deposition (DED), an AM technology that could be used for bigger parts and adding features to existing parts. The project objective is to bring on DED suppliers to enable the acquisition of development metal hardware for P&W’s advanced …
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Directed energy deposition of tool steel/copper alloy multi-material structures
… the potential of MMSs fabricated by directed energy deposition (DED) using tool steel and copper alloy. Specifically, AISI H13 hot work tool steel is deposited on copper-beryllium alloy (CuBe) substrate using three deposition strategies: directly depositing H13 on CuBe (H13/CuBe), SS316L …
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Feasibility Assessment of Repairing Tools and Dies via Directed Energy Deposition
L'abstract è presente nell'allegato / the abstract is in the attachment
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Energy deposition into heavy gas plasma via pulsed inductive theta-pinch
… specifically the coupling of stored capacitive energy into plasma via formation in a theta pinch coil. To aid in this research, the Missouri Plasmoid Experiment Mk. I (and later Mk. II) was created.</p> <p>In the first paper, the construction of differential magnetic field probes are discussed. …
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Layer-to-Layer Feedback Control for Direct Energy Deposition Additive Manufacturing
… parts repeatably. More specifically, direct energy deposition (DED) of metal powders is a process capable of producing and repairing parts with complex geometries; however, it is not widely used in industry due to challenges with quality control. In this process, metal powder is dispensed …
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Energy deposition in the lower auroral ionosphere through energetic particle precipitation
… and satellite instruments to investigate high-energy precipitation in the auroral zone. There are two dominant precipitation regimes in the auroral zone which lead to enhanced high frequency radio absorption; high energy electrons (> keV) from closed field lines, and protons (> MeV) penetrating …
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An Investigation of Polymer Support Structures In Metal Directed Energy Deposition
Metal directed energy deposition (DED) can create complex components and has a high deposition rate compared to other metal additive manufacturing (AM) processes. As a result, DED is of interest to die and mold, energy, and aerospace industries, among others. However, the design space of DED is …
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Fusion Product Energy Deposition and Advanced Fuel Burn Performance for Inertial Confinement Fusion Targets
Made available in DSpace on 2017-07-06T18:48:23Z (GMT). No. of bitstreams: 3 Harris_David_B_MS.pdf: 27893410 bytes, checksum: 04c95497517e095a9bdc3d6268e4f02c (MD5) Harris_David_B_MS_ABS.pdf: 490059 bytes, checksum: eb262a8a9ff388e34dd29d0a130d47ec (MD5) license.txt: 4813 bytes, checksum: …
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Stability analysis of CICCs by measurement of energy deposition due to pulsed current disturbances
Thesis (Nucl. E.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1996.
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Solidification behavior and texture of laser-wire directed energy deposition of 316L austenitic stainless steel
… of AM 316L produced using a laser-wire directed energy deposition (DED-LB) process was investigated and delta-ferrite morphology was utilized to determine the solidification pathway of AM 316L. Variations in shielding gas set-up and build type, single versus multi-track walls, resulted in …
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Laser Directed Energy Deposition of tool steels; Investigating the heat treatment strategies and other potentialities of LDED
… Ferro55), fabricated through Laser Directed Energy Deposition (LDED). The as-built microstructure of these steels comprises a martensitic matrix with ~10 vol.% retained austenite (RA) as a consequence of microsegregation at cellular\dendrite boundaries. The tempering behavior is studied …
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Response Of Plasma Facing Components In Tokamaks Due To Intense Energy Deposition Using Particle-In-Cell(pic) Methods
… concern for the successful development of fusion energy and represents a significant research obstacle in the community. It is of great importance to fully understand the behavior and lifetime expectancy of PFC under both low energy cycles during normal events and highly energetic events as …
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Simulation, design and construction of a gas electron multiplier for particle tracking
… of gas ionization devices to measure deposited energy. The Gas Electron Multiplier (GEM) has been used since 1997 for tracking particles and for the determination of particle energy. In general, the GEM detector works in either tracking or energy deposition mode. The instrument proposed here is …
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Irradiators for measuring the biological effects of low dose-rate ionizing radiation fields
… differs with radiation field. Particle type, energy spectrum, and dose-rate all affect biological response per unit dose. This thesis describes methods of spectral analysis, dosimetry, biological assays, and mathematical modeling for determining the relative biological response for low …
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Yeast-based impedance biodosimetry for retrospective assessment of radiation exposures
… the local environment influences the radiative energy deposition in yeast cells. This is due to the primary and secondary photoelectrons and Compton electrons that are produced within these materials, which contribute to additional energy deposition and increase damage to cells. This effect was …
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Multi-scale modeling of laser induced breakdown in non-equilibrium plasmas
… of quantities of interest (e.g., absorbed energy and plasma emission) predicted by the Laser-Induced Breakdown (LIB) model with the corresponding experimental measurements in a wide range of operating conditions. For single-pulse and single-mode discharges, the laser generated plasma …
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Optimizing graphene oxide reduction via laser irradiation
… at various laser powers, scan speeds, and total energy deposition, in an attempt to optimize this single step reduction. The quality of the finished product was determined by two probe multimeter resistance measurements, and carbon to oxygen ratios given by X-ray microanalysis.
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