ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV / We address the problem of detection in orbital angular momentum (OAM). The focus of our analysis will be on the power efficient Q-ary Pulse Position Modulation (Q - PPM). Free space optical signals sent through wireless channels are degraded by atmospheric turbulence. In this paper a novel detection approach based on a factor graph representation of OAM Q-PPM signalling is presented to equalize for the crosstalk among orbital angular momentum vortices. It will be shown that our proposed detection algorithm significantly outperforms the separate detection scenario in terms of error rate performance.

This dissertation consists of three independent chapters, each of which use microeconomic data and methods to inform an analysis of macroeconomic models and questions. The first two chapters study the short-run dynamics of housing markets, while the last chapter studies fluctuations in labor markets. / Economics

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Magistro darbo autorius: Andrius Samuolis Magistro darbo pavadinimas: Judesio kiekio momento ryšio schemos grafo transformacija Vadovas: doc. dr. A. Deveikis Darbas pristatytas: Vytauto Didžiojo Universitetas, Informatikos fakultetas, Kaunas, 2011 birželis. Puslapių skaičius: 46 Lentelių skaičius: 2 Paveikslų skaičius: 43 Priedų skaičius: 3 Sudaromas supaprastintas judesio kiekio momento grafinis metodas skirtas transformacijos matricų vaizdavimui ir supaprastinimui. Siūlomas metodas apibendrina Vilniaus teorinės fizikos mokyklos sukurto grafinio metodo praktinio taikymo patirtį ir apima tik daţniausiai taikomas jo taisykles. Transformacijos matrica supaprastinama suvedant jos pavidalą į 6j ir 9j koeficientus. Metodo taisyklės yra pakankamai paprastos ir gali būti naudojamos atitinkamų kompiuterinių įrankių kūrimui. / Author of Master Thesis: Andrius Samuolis Full title of Master Thesis: Transformation of the angular momentum coupling graph Supervisor: doc. dr. A. Deveikis Presented at: Vytautas Magnus University, Faculty of Informatics, Kaunas, June 2011. Number of pages: 46 Number of tables: 2 Number of pictures: 43 Number of appendices: 3 Establishes a simplified graphical angular momentum method, which is intended to represent and simplified transformation matrix. Suggest method summarizes graphic method practical experience and includes only the most common form of the rules, which were created by Vilnius school of Theoretical Physics. The transformation matrix is simplified when it’s shape is reduced to 6j and 9j coefficients. Principle rules are simple and can be used in the development of computer tools.

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It is well understood through previous literature that strategies, which buy past winning stocks and sell past losing stocks, can generate significant positive returns. This phenomenon is known as the momentum effect in the stock market. Furthermore, there is a common accounting practice used by portfolio managers called tax loss harvesting.Tax loss harvesting is the practice of selling a security in order to create a benefit for tax purposes. This paper attempts to build upon previous literature by explaining why the momentum effect is different at the beginning of the calendar year than in the middle and assessing whether or not tax loss harvesting may play a role. A trading strategy was created which calculates the returns of winning and losing portfolios intra industry groups, around different months of the year, in attempt to explain fluctuations in the momentum effect. Evidence in support of the hypothesis that tax loss harvesting played a role in impacting momentum strategies did not prove to be statistically significant.

Coaxial jet flows have a considerable practical application area as water jet pumps. Efficiency of such systems is affected by complex turbulence mechanisms and large-scale vortex structures formed in the mixing regions. An experimental setup is constructed to estimate the momentum exchange rates and mixing of the two jet flows from the coaxial pipes. Pressure distributions along the mixing pipe wall are measured for different flow ratios of the jets. In addition to present experiments, numerical data of two experimental studies from the literature are considered as test cases. Numerical solutions for the test cases are obtained using FLUENT. Experimental and numerical results are compared and adequacy of FLUENT solution is illustrated.

Environmental, aesthetic and political pressures continue to push for siting off-shore wind turbines beyond sight of land, where waters tend to be deeper, and use of floating structures is likely to be considered. Savings could potentially be realized by reducing hull size, which would allow more compliance with the wind thrust force in the pitch direction. On the other hand, these structures with large-amplitude motions will make dynamic analysis both more challenging and more critical. Prior to the present work, there were no existing dynamic simulation tools specifically intended for compliant wind turbine design. Development and application of a new computational method underlying a new time-domain simulation tool is presented in this dissertation. The compliant floating wind turbine system is considered as a multibody system including tower, nacelle, rotor and other moving parts. Euler's equations of motion are first applied to the compliant design to investigate the large-amplitude motions. Then, a new formulation of multibody dynamics is developed through application of the conservation of both linear momentum and angular momentum to the entire system directly. A base body is prescribed within the compliant wind turbine system, and the equations of motion (EOMs) of the system are projected into the coordinate system associated with this body. Only six basic EOMs of the system are required to capture 6 unknown degrees of freedom (DOFs) of the base body when mechanical DOFs between contiguous bodies are prescribed. The 6 x 6 mass matrix is actually composed of two decoupled 3 x 3 mass matrices for translation and rotation, respectively. Each element within the matrix includes the inertial effects of all bodies. This condensation decreases the coupling between elements in the mass matrix, and so minimizes the computational demand. The simulation results are verified by critical comparison with those of the popular wind turbine dynamics software FAST. The new formulation is generalized to form the momentum cloud method (M- CM), which is particularly well suited to the serial mechanical N-body systems connected by revolute joints with prescribed relative rotation. The MCM is then expanded to multibody systems with more complicated joints and connection types.

Thesis (Ph.D.); Submitted to New Mexico State Univ., Las Cruces, NM (US); 1 May 2003. / Published through the Information Bridge: DOE Scientific and Technical Information. "JLAB-PHY-03-22" "DOE/ER/40150-2731" David McKee. 05/01/2003. Report is also available in paper and microfiche from NTIS.

Includes bibliographical references (p. 10). / "Physics and Mathematics" -t.p. "TID-4500 (15th Ed.)" -t.p.