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 69 for “"in-beam"”.
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RF wave observations in beam-plasma discharge
The Beam Plasma. Discharge (BPD) has been produced in the large vacuum chamber at Johnson Space Center (2 x 3 m) using an energetic electron beam of moderately high perveance (K ~ 1.4 x 1^-6 A V^-3/2). A more complete expression of the threshold current IC taking into account the pitch angle …
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Anwendung des in-beam PET Therapiemonitorings auf Präzisionsbestrahlungen mit Helium-Ionen
Das Hauptziel einer Strahlentherapie, die möglichst vollständige Vernichtung des Tumorgewebes bei einer höchstmöglichen Schonung des umliegenden Gewebes und der Risikoorgane, kann mit Kohlenstoffionen besser als mit Elektronen oder Gammastrahlung erreicht werden. Ionen haben ein inverses …
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Phytoplankton growth and diel variations in beam attenuation through individual cell analysis
A number of investigators have observed diel variations in the bulk water inherent optical property beam attenuation, with a minimum near dawn and a maximum near dusk, and have assumed them to be caused by the phytoplankton. In an attempt to understand these patterns, mean forward light scatter of …
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System Solution for In-Beam Positron Emission Tomography Monitoring of Radiation Therapy
In-beam Positron Emission Tomography (PET) is a system for monitoring high precision radiation therapy which is in the most cases applied to the tumors near organs at risk. High quality and fast availability of in-beam PET images are, therefore, extremely important for successful verification of …
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Phytoplankton growth and diel variations in beam attenuation through individual cell analysis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1995.
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Application of Chebyshev Formalism to Identify Nonlinear Magnetic Field Components in Beam Transport System
… experiment was conducted at Jefferson Lab's Continuous Electron Beam Accelerator Facility to develop a beam-based technique for characterizing the extent of the nonlinearity of the magnetic fields of a beam transport system. Horizontally and vertically oriented pairs of air-core kicker magnets …
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Crack path selection and shear toughening effects due to mixed mode loading and varied surface properties in beam-like adhesively bonded joints
… yet occasional failures can occur, often resulting from improper bonding procedures or joint design, overload or other detrimental service situations, or in response to a variety of environmental challenges. In these situations, cracks can start within the adhesive layer or debonds can initiate …
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Attitude control of an underwater vehicle subjected to waves
This paper presents a method for estimating the spectra of water wave disturbances on five of the six axes of a stationary, slender body underwater vehicle in an inertia dominated wave force regime, both in head seas and in beam seas. Inertia dominated wave forces are typical of those encountered …
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Asymptotic Wave Solutions for Euler-Bernoulli and Timoshenko Beam by Ray Method and Stationary Phase Method
The behavior of flexural (bending, transverse) waves in beam structures is of basic importance in the stress wave theory and has been studied for many years. Many methods have been attempted to understand the flexural waves in beams based on Euler-Bernoulli and Timoshenko beam theories. Accurate …
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Investigation of Time-Dependent Deflection in Long Span, High Strength, Prestressed Concrete Bridge Beams
Accurate camber prediction in prestressed concrete bridge beams is important to all parties involved in bridge design and construction. Many current prestress loss prediction methods, necessary for proper camber calculation, were developed many years ago and are predicated on assumptions that may …
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CEBAF Upgrade Bunch Length Measurements
… use short electron bunches and measuring the bunch length is important for efficient operations. CEBAF needs a suitable bunch length because bunches that are too long will result in beam interruption to the halls due to excessive energy spread and beam loss. In this work, bunch length …
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Reliability of reinforced concrete beams in torsion
… Standard 318-83 design criteria for torsional reinforced concrete members is evaluated. Advanced first-order, second-moment reliability analysis is used to compute the reliability index. Reinforced concrete beams, subjected to both equilibrium and compatibility torsion, are analyzed. The …
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Study of Condition Monitoring of Bridges Using Genetic Algorithms
… through non-destructive evaluation techniques using genetic algorithms. System identification techniques are used to establish the mathematical model of the real structural system through parametric methods. The problem of structural condition monitoring is formulated as an optimization problem. …
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Liquid lens beam steering and environmental testing for the miniature optical steered antenna for inter-satellite communication
We investigate the feasibility of using a series of deformable liquid lenses to achieve wide-angle beam steering for CubeSat laser communication (lasercom) crosslinks. Liquid lenses are lenses that can non-mechanically alter focal length based on an applied voltage or current. We evaluate two …
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Compensation Techniques in Accelerator Physics
… physics is one of the most diverse multidisciplinary fields of physics, wherein the dynamics of particle beams is studied. It takes more than the understanding of basic electromagnetic interactions to be able to predict the beam dynamics, and to be able to develop new techniques to produce, …
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A novel torsional spring design for knee prostheses and exoskeletons
In this thesis, a novel torsion spring design for use in knee prostheses and exoskeletons is presented and analyzed. The planar spring design features an outer hub and an inner hub, which are connected by slender beams and store torsion energy in beam bending. The beams are fixed to the outer hub …
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A Multi-DOF Soft Robot Mechanism for Patient Motion Correction and Beam Orientation Selection in Cancer Radiation Therapy
Accurate patient immobilization in conformal radiation therapy is crucial for efficient cancer treatment. Good treatment outcomes require accurate patient immobilization and a good choice of beam orientations. State-of-the-art immobilization systems rely on metallic or rigid masks which lack …
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Metasurfaces and Their Applications in Photonic Devices
… nanostructures. They can manipulate light in unprecedented ways by altering amplitude, phase, and polarization at subwavelength scales. The ability of these two-dimensional elements to perform multiple optical functions within compact optical systems—while offering high functionality, small …
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Application-driven Intersections between Information Theory and Machine Learning
Machine learning has been tremendously successful in the past decade. In this thesis, we introduce guidance and insights from information theory to practical machine learning algorithms. In particular, we study three application domains and demonstrate the algorithmic gain of integrating machine …
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