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 224 for “"Coaxial"”.
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Coaxial contrarotating twin rotor aerodynamics
The modelling of a Coaxial Contrarotating Twin Rotor (CCTR) system has been developed from single rotor modelling techniques. Particular attention has been paid to the characteristics of the tip vortex, namely, vortex strength, structure and decay. Equations are presented which describe both the …
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Coaxial air core electromagnetic accelerators
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1982.
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Experimental investigation of a coaxial gyrotron oscillator
… results of a megawatt power level, 140 GHz coaxial gyrotron oscillator. The coaxial gyrotron has the potential to transport very high power electron beams and thus achieve higher microwave output power levels than conventional gyrotrons. A TE2 ,3 coaxial gyrotron was designed to operate at …
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High current coaxial ion beam/laser beam spectrometer
… the ion beam and laser beam overlap in a coaxial geometry. The machine has much higher ion current than an apparatus previous used. The laser beam induces transitions between internal states of the molecular ion. The transitions are detected by allowing the ion beam to collide with …
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Analytical and Experimental Study on Coaxial Borehole Heat Exchangers
… of direct-use geothermal energy considering a coaxial borehole heat exchanger (BHE) as a major component in a ground-source heat pump (GSHP) system. A GSHP system is a sustainable energy system that transfers thermal energy between the surrounding ground and the conditioned space of a building. …
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Resonant UPS topologies for the emerging hybrid fiber coaxial networks
… critical loads, the emerging hybrid fiber-coaxial networks have created the need for specific types of UPS topologies. For example, galvanic isolation for the load and the battery, small size, high input power factor, and trapezoidal output voltage waveforms are among the required features …
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Coaxial double-walled microspheres for drug and gene delivery applications
… double-walled microspheres were developed by coaxial electrohydrodynamic atomization (CEHDA) and precision particle fabrication (PPF) techniques. Here, we focus on double-walled microspheres consisting of a poly(D,L-lactic-co-glycolic acid) (PLGA) core surrounded by a poly(D,L-lactic acid) …
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A low-frequency instability mechanism in a coaxial dump combustor
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Optimization of micro-coaxial wire routing in complex microelectronic systems
… we work with new technology that utilizes coaxial wires, allowing the construction of single-layered chips. Though the single layer lends itself well to optimization techniques, this approach generates novel challenges of its own. We design and implement multiple global routing algorithms …
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Improved gust rejection for a micro coaxial helicopter in urban environments
… on this topic by assessing how to design a micro coaxial helicopter with improved gust response in complex urban environments. Both experimental flight tests and modeling and simulation tools are developed and executed to analytically understand the challenges and potential solutions to enable …
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Modeling, Control, and Hardware Development of a Thrust-Vector Coaxial UAV
<p>This thesis introduces a unique thrust vector coaxial unmanned aerial vehicle (UAV) configuration and presents a comprehensive investigation encompassing dynamics modeling, hardware design, and controller development. Using the Newton-Euler method, a dynamic model for the UAV is derived to gain …
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Performance Analysis of a Coaxial Helicopter in Hover and Forward Flight
<p>The performance of a coaxial rotor system has been analyzed by establishing a proper basis of comparison between a conventional single rotor and coaxial rotor. An attempt has also been made to better understand the complicated aerodynamic interactions associated with coaxial rotor wakes by using …
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Characterization of mixing in a coaxial jet mixer for nanoparticle fabrication
Mixing in a micro-scale coaxial turbulent jet mixer for the fabrication of nanoparticles for drug delivery was experimentally characterized. Rapid mixing due to turbulence offers improved control of nanoparticle production over conventional bulk nanoprecipitation methods. Mixing time was determined …
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Studies of coaxial multipactor in the presence of a magnetic field
… work investigates multipactor discharges in the coaxial geometry in the presence of a constant and uniform magnetic field transverse to the direction of electromagnetic wave propagation. Studies on the Coaxial Multipactor Experiment (CMX) show that the magnetic field decreases the degree to which …
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Formability of Sheet Metal Under Non-Coaxial and Zig Zag Strain Paths
… drawing, the deformation in the work-piece is coaxial owing to axial symmetry; in other words, during the forming operation, the principal axes of stress and strain coincide with each other and are fixed with respect to the material. The directions of the principal axes are along the meridional …
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Design and Characterization of a Coaxial Plasma Railgun for Jet Collision Experiments
… the design and characterization of a small coaxial plasma railgun intended to accelerate argon-helium plasma jets. The railgun will be used for the study of plasma shocks in jet collisions. The railgun is mounted on a KF-40 vacuum port and operated using a 90 kA, 11 kV LC pulse forming …
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Feasibility of supercritical CO2 coaxial heat exchanger geothermal well conversion with ECO2G technology
… wells to closed loop supercritical CO2 coaxial heat exchanger using ECO2G technology was analyzed for two heat exchanger scenarios. The first scenario, Case A, utilizes the existing production casing as the heat exchanger and plugs the well at 1000 m depth to create the closed loop. The …
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