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.
Results
Showing 1 to 20 of 1535 for “"Trap"”.
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Surface trap for ytterbium ions
… an experiment to load a shallow planar ion trap from a cold atom source of Ytterbium using photoionization. The surface trap consisted of a three-rod radio frequency Paul trap fabricated using standard printed circuit board techniques. The cold atom source was an isotope-selective …
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Overdue Debt as a Poverty Trap
… to better understand the dynamics of poverty trap induced by overdue debt but also enhances the rediscussing of current policy tools. Our research is based on data collected with targeted questionnaires in March and April 2019 by the Soreco Research Kft. Data were recorded with a personal …
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Design methodology for electron-trap memory cells
… on design methodologies for SET based Electron-Trap which is a basic memory cell that has been recently fabricated. Given a circuit topology and the corresponding targeted behaviour, the proposed methodology assists the circuit designer in deriving the circuit parameters in an analytical way. …
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The development of a concentrating solar trap
… other an important family of concentrating solar trap has been overlooked. This class of collector has combined together the advantages of some of the other collector types by overcoming their individual disadvantages. A concentrating solar trap acts like a non-focussing radiation funnel which by …
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A quasi-electrostatic trap for neutral atoms
Im Rahmen dieser Arbeit wurde eine `quasi-elektrostatische' Atomfalle (QUEST) fuer neutrale Atome realisiert. Caesium und Lithium wurden gemeinsam gespeichert und damit erstmals die Mischung verschiedener Spezies in einer optischen Dipolfalle demonstriert. Die Falle wird durch den Fokus eines …
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Measuring acoustic fields in an optical trap
… thesis describes progress in the use of optical traps for measurement of acoustic fields, a first step toward acoustic micromanipulation in fluids. The optical trap used throughout this study is carefully characterized. Eccentricity of measured distributions of thermal fluctuations of trapped …
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Design of a dual beam optical trap
Dual beam optical traps use radiation pressure from two counterpropagating laser beams to manipulate microscopic particles. Typical traps use optical fibers to guide those beams. This thesis proposes a design for the coaxial alignment of optical fibers that allows for the fibers to translate along …
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Penning trap mass spectroscopy at 0.1 ppb
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1993.
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Development of a Laminar Construction Quadrupole Ion Trap
The three-dimensional quadrupole ion trap (QIT) is an extraordinary device. It functions both as an ion store in which gaseous ions can be confined for a period of time and as a mass spectrometer of considerable mass range and variable mass resolution. Over the past few decades, it has evolved into …
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ION TRAP SYSTEM TOWARDS 176LU+ 3D2 CLOCK TRANSITION
… thesis focuses on the development of a new ion trap system allowing for 3D1 clock comparison at the low 10-19 and the calibration of systematics for the 3D2 transition. The first part details the design, construction, and characterization of the upgraded trap system, which replaces the previous …
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On-trap derivatization of short-chain fatty acids
… studies by others using multibed-sorbent traps, solid phase microextraction (SPME), and on-fiber derivatization with SPME showed that it is possible to achieve low limits of detection (LODs) for the gas chromatographic (GC) headspace analysis of SCFAs. The goal of this project was to …
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Scalable trap technology for quantum computing with ions
… such as the electronic or spin state of a trapped atomic ion. Physics experiments with single atomic ions acting as "quantum bits" have demonstrated many of the ingredients for a quantum computer. But to perform useful computations these experimental systems will need to be vastly …
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China’s One Belt One Road Initiative—A Debt Trap?
<p>Infrastructure has been a bottleneck for industrialization of developing countries. After decades of economic growth led by investment in infrastructure, China released its first global strategy in 2013, One Belt One Road (BRI), to improve infrastructure in less developed countries along the …
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The evolution and functional morphology of trap-jaw ants
… innovation in the diversification of “trap-jaw” ants: power-amplified mandibles used for prey capture, nest defense, and individual escape from predators. Insects are the most diverse and numerically abundant animal group on the planet. One feature that contributed to their evolutionary …
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Trap modelling and injection effects in GaN power devices
… are (i) substrate leakage, (ii) buffer and trap modelling and (iii) hole injection effects. Characterization has been performed on small and large area test structures and transistors by means of static and dynamic measurements. Based on temperature dependent leakage measurements, the …
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Effects of Surface Ion Milling on Ion Trap Heating
Ions trapped above a surface electrode chip are a viable candidate for a scalable qubit architecture. The internal electronic state of the ions serve as qubits, while the shared motional modes of ions in a lattice serve as a quantum bus by which information can be shared. Gate operations are …
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The penning trap electron gun for the KATRIN experiment
… sources for this experiment: the Penning trap electron gun. This calibration source will use ion storage techniques usually used in high resolution mass spectroscopy to store and excite electrons to a known energy and then release them with a user-controlled angular distribution. These …
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Towards a cryogenic planar ion trap for Sr-88
This thesis describes experiments with ion traps constructed with electrodes in a single two-dimensional plane, and ion traps operated in a cryogenic environment at 77K and 4K temperatures. These two technologies address needs which arise in developing potentially scalable approaches to quantum …
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Design and Implementation of Position-Encoded Microfluidic Microsphere-Trap Arrays
… microfluidic technology and a hydrodynamic trapping mechanism. We call our device microfluidic microsphere-trap arrays. To fully realize the potential of the device in biomedical applications, we utilize statistical performance analysis, mathematical optimization, and finite element fluid …
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