In this thesis I address two different topics in quantum theory. The first one is the long discussed Schrodinger's cat problem, and the issues related to having a macroscopic superposition state. I show that the quantum theory provides full explanation to the problem. In the second part, I discuss the time measurement related issues in quantum mechanics. Since there does not exist any time operator in quantum mechanics generally, time is not directly measurable. Therefore we should devise other methods to register time. We study different time-energy relations and will find that accurate clocks have high energy uncertainties. If we use accurate clocks in quantum systems to observe their time evolutions, their high energy uncertainties interfere with system's normal evolution and slows it down. I also provide a formal proof to a previously suggested limiting accuracy relation on the measurements of the time-of-arrival experiments.

Thesis (Ph. D. in engineering science)--Washington State University. / Includes bibliographical references.

No description available.

In this thesis I address two different topics in quantum theory. The first one is the long discussed Schrodinger's cat problem, and the issues related to having a macroscopic superposition state. I show that the quantum theory provides full explanation to the problem. In the second part, I discuss the time measurement related issues in quantum mechanics. Since there does not exist any time operator in quantum mechanics generally, time is not directly measurable. Therefore we should devise other methods to register time. We study different time-energy relations and will find that accurate clocks have high energy uncertainties. If we use accurate clocks in quantum systems to observe their time evolutions, their high energy uncertainties interfere with system's normal evolution and slows it down. I also provide a formal proof to a previously suggested limiting accuracy relation on the measurements of the time-of-arrival experiments.

No description available.

Thesis (Ph. D.)--University of Alabama at Birmingham, 2008. / Additional advisors: Jerry Aldridge, Lois Christensen, Lynn Kirkland, Maryann Manning. Description based on contents viewed Oct. 7, 2008; title from PDF t.p. Includes bibliographical references (p. 66-68).

Thesis (M. Eng.)(Mechanical)--University of Pretoria, 2005. / Includes bibliographical references. Available on the Internet via the World Wide Web.

In this thesis I address two different topics in quantum theory. The first one is the long discussed Schrodinger's cat problem, and the issues related to having a macroscopic superposition state. I show that the quantum theory provides full explanation to the problem. In the second part, I discuss the time measurement related issues in quantum mechanics. Since there does not exist any time operator in quantum mechanics generally, time is not directly measurable. Therefore we should devise other methods to register time. We study different time-energy relations and will find that accurate clocks have high energy uncertainties. If we use accurate clocks in quantum systems to observe their time evolutions, their high energy uncertainties interfere with system's normal evolution and slows it down. I also provide a formal proof to a previously suggested limiting accuracy relation on the measurements of the time-of-arrival experiments. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

This thesis explores a Time-Difference-of-Arrival (TDOA) approach to radio direction finding, utilizing picosecond-resolution Time-to-Digital Converters (TDCs). By measuring the relative time of arrival of a pulsed RF signal impinging on an antenna array, direction of arrival (DOA) can be ascertained. This technology enables versatile DOA calculation on platforms only several meters in length, and offers various size, weight, power, and cost advantages when compared to present DF technologies. A short baseline S-band TDOA DF system utilizing TDCs is designed, fabricated, and tested in a laboratory environment. This research suggests that such a DF system based on TDCs provides sufficient accuracy and precision to resolve Angle-ofArrival (AOA) within several degrees.

This research focused on an important aspect of production, machine changeover, or setup time. Setup time is defined as the elapsed time between producing the last part from the most recent lot to the first part of an incoming lot. The research had four objectives. First, an existing method to reduce machine changeover time was evaluated in a high-precision machine cell (HPMC). Second, the causes and effects of setup problems in an HPMC were identified. Third, a method to reduce setup time was developed to more fully address some of the identified problems. Fourth, the developed method was evaluated in another HPMC. After reviewing published setup reduction methodologies, the Single Minute Exchange of Dies (SMED) approach was selected for evaluation in machine cells. According to its developer, SMED can typically reduce setup time by 70 to 90%. The case study did not fully support this claim. Possible explanations for the mixed results were developed. Also, a number of setup problems were not fully corrected. These problems included machine and tooling failures, delays from tasks not completed at the machine area, and labor-related problems. A method to reduce setup time was developed. The method applied the work simplification approach to reduce setup time. The developed setup reduction method consisted of five steps: (1) document the existing method, (2) simplify the current method while using the same tooling and procedures, (3) identify opportunities to reduce setup time, (4) prioritize the opportunities and (5) implement the prioritized projects. The method includes the basic setup reduction principles of SMED and addresses problems that were not fully corrected by SMED. The developed method was tested in another high-precision machine cell. An additional 22% reduction in setup time occurred as a result of correcting problems not fully addressed by SMED. It was concluded that because the new method focused on the manpower, materials, and methodology used during a changeover, it reduced setup time further than existing methods. / Master of Science