No description available.

No description available.

学位授与大学：京都大学 ; 取得学位: 博士(工学) ; 学位授与年月日: 2007-09-25 ; 学位の種類: 新制・課程博士 ; 学位記番号: 工博第2843号 ; 請求記号: 新制/工/1418 ; 整理番号: 25528 / The unsteady buffeting forces and the gust response prediction of bridges in the atmospheric turbulent flows is recently attracted more attention due to uncertainties in both experiment and analytical theory. The correction functions such as the aerodynamic admittance function and the spatial coherence function have been supplemented to cope with limitations of the quasi-steady theory and strip one so far. Concretely, so-called single-variate quasi-steady aerodynamic admittance functions as the transfer functions between the wind turbulence and induced buffeting forces, as well as coherence of wind turbulence has been widely applied for the gust response prediction. Recent literatures, however, pointed out that the coherence of force exhibits higher than that of turbulence. These correction functions, in the other words, contain their uncertainties which are required to be more understanding. Proper orthogonal decomposition (POD), known as the Karhunen-Loeve decomposition has been applied popularly in many engineering fields. Main advantage of the POD is that the multi-variate correlated random fields/processes can be decomposed and described in such simplified way as a combination of limited number of orthogonally low-order dominant eigenvectors (or turbulent modes) which is convenient and applicable for order-reduced representation, simulation of the random fields/processes such as the turbulent fields, turbulent-induced force fields and stochastic response prediction as well. The POD and its proper transformations based on either zero-time-lag covariance matrix or cross spectral one of random fields/processes have been branched by either the covariance proper transformation (CPT) in the time domain or the spectral proper transformation (SPT) in the frequency domain. So far, the covariance matrix-based POD and its covariance proper transformation in the time domain has been used almost in the wind engineering topics due to its simplification in computation and interpretation. In this research, the unsteady buffeting forces and the gust response prediction of bridges with emphasis on the POD applications have been discussed. Investigations on the admittance function of turbulent-induced buffeting forces and the coherence one of the surface pressure as well as the spatial distribution and correlation of the unsteady pressure fields around some typically rectangular cylinders in the different unsteady flows have been carried out thanks to physical measurements in the wind tunnel. This research indicated effect of the bluff body flow and the wind-structure interaction on the higher coherence of buffeting forces than the coherence of turbulence, thus this effect should be accounted and undated for recent empirical formulae of the coherence function of the unsteady buffeting forces. Especially, the multi-variate nonlinear aerodynamic admittance function has been proposed in this research, as well as the temporo-spectral structure of the coherence functions of the wind turbulence and the buffeting forces has been firstly here using the wavelet transform-based coherence in order to detect intermittent characteristics and temporal correspondence of these coherence functions. In POD applications, three potential topics in the wind engineering field have been discussed in the research: (i) analysis and identification, modeling of unsteady pressure fields around model sections; (ii) representation and simulation of multi-variate correlated turbulent fields and (iii) stochastic response prediction of structures and bridges. Especially, both POD branches and their proper transformations in the time domain and the frequency one have been used in these applications. It found from these studies that only few low-order orthogonal dominant modes are enough accuracy for representing, modeling, simulating the correlated random fields (turbulence and unsteady surface pressure, unsteady buffeting forces), as well as predicting stochastic response of bridges in the time and frequency domains. The gust response prediction of bridges has been formulated in the time domain at the first time in this research using the covariance matrix-based POD and its covariance proper transformation which is very promising to solve the problems of the nonlinear and unsteady aerodynamics. Furthermore, the physical linkage between these low-order modes and physical causes occurring on physical models has been interpreted in some investigated cases. / Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(工学) / 甲第13372号 / 工博第2843号 / 新制||工||1418(附属図書館) / 25528 / UT51-2007-Q773 / 京都大学大学院工学研究科社会基盤工学専攻 / (主査)教授 松本 勝, 教授 河井 宏允, 准教授 白土 博通 / 学位規則第4条第1項該当

The present study investigated whether encoding manipulations which were supposed to make source monitoring of critical lures difficult could alter the levels of false recall for peoples names used as lures in the Deese-Roediger-McDermott list learning paradigm. The results demonstrated that most of manipulations used in the present experiments failed to increase the levels of false recall for the critical lures that were peoples names as it is assumed that, at the same time, the manipulations attenuated semantic encoding around the critical lures, and consequently lowered their activation levels, which is assumed to be essential to obtain high false recall of critical lures. On the other hand, manipulations which resulted in keeping participants from realizing the nature of the list organization, at least, hindered the decrease of false recall level. The question of why false recall for peoples names is rarely elicited in general was discussed.

Formulación espectral de la radiación en coordenadas cartesianas, cilíndricas y esféricas. Aplicación de la formulación a problemas de diagnostico de antenas, análisis del efecto de radomos y transformación campo próximo campo lejano.Estudio del efecto de errores de medida en campo próximo cilíndrico sobre el diagrama de radiación. Se aplican los desarrollos realizados al diseño, construcción y validación de un campo próximo de medida de antenas en coordenadas cilíndricas. / A unified approach of radiation of sources (antennas) in Cartesian, cylindrical and spherical coordinates is presented. The relationship between model expansions is developed and major characteristics of each modal expansion are discussed.The formulation is applied to the near to far field transformation in cylindrical coordinates and design expressions for the implementation of a cylindrical near-field range are developed. These design expressions allow to specify the measuring system in terms of positioning errors and required signal to noise ratio to achieve a certain degree of accuracy in the far field radiation pattern.Finally, a practical design of a cylindrical near field range operating in S band is presented.

The purpose of this paper is to compose reduced proper motion diagram (RPMD) and to perform its analysis. The stars that has MKK system or those belonging to the group of subdwarf, white dwarf and metal-deficient. From possessed data catalog known binary stars were excluded. Color excess EB-V in this paper was calculated in the following two ways: •Using MKK system; •Using Shlegel method (including distance to the star). Color excess average that was calculated from EB-V results found using two above presented ways was used for 1-5 luminosity classes. calculated according to Shlegel method was used for subdwarf and metal-deficient stars. Taking into account that white dwarfs are near stars, EB-V was equated to 0. Following parameters were calculated in this paper: interstellar extinction AV, reduced proper motion HV, and absolute magnitude MV. Accuracy of used parameters was analysed. Having composed RPMD separately for each luminosity class, distribution areas of the stars were localysed by two intersecting lines. Obtained RPMD was compared to the Jones reduced proper motion diagram. Identified relation between MV and HV was approximated with line.

ALENCAR, Valdetonio Pereira de. O significado dos nomes próprios. 2007. 98f. – Dissertação (Mestrado) – Universidade Federal do Ceará, Programa de Pós-graduação em Filosofia, Fortaleza (CE), 2007. / Submitted by Gustavo Daher (gdaherufc@hotmail.com) on 2017-09-27T12:10:48Z No. of bitstreams: 1 2007_dis_vpalencar.pdf: 478414 bytes, checksum: 3b9be3b826fbc0f421d30fca52f5a553 (MD5) / Approved for entry into archive by Márcia Araújo (marcia_m_bezerra@yahoo.com.br) on 2017-09-29T13:40:15Z (GMT) No. of bitstreams: 1 2007_dis_vpalencar.pdf: 478414 bytes, checksum: 3b9be3b826fbc0f421d30fca52f5a553 (MD5) / Made available in DSpace on 2017-09-29T13:40:16Z (GMT). No. of bitstreams: 1 2007_dis_vpalencar.pdf: 478414 bytes, checksum: 3b9be3b826fbc0f421d30fca52f5a553 (MD5) Previous issue date: 2007 / My work is divided in two parts First I explain the theories (about proper names) of Frege Russell Searle and Kripke Second my approach is more systematical I wanted to introduce a definite description that it has the same behavior semantic of the proper name (co-extensional with the definite description) However I pretended to maintain the fundamental aspects of the theory of Kripke about the proper names. / A dissertação trata do problema dos nomes próprios Ela se divide em duas partes Na primeira as teorias de Frege Russell Searle e Kripke são examinadas de forma analítica e crítica Na segunda trato de forma sistemática meu tema Procurei introduzir uma descrição definida que possui o mesmo comportamento semântico dos respectivos nomes próprios mas mantendo os aspectos fundamentais da teoria de Kripke acerca dos nomes próprios.

No description available.

There are two critical research needs for the study of hydrocarbon combustion in high speed flows: 1) combustion diagnostics with adequate temporal and spatial resolution, and 2) mathematical techniques that can extract key information from large datasets. The goal of this work is to address these needs, respectively, by the use of high speed and multi-perspective chemiluminescence and advanced mathematical algorithms. To obtain the measurements, this work explored the application of high speed chemiluminescence diagnostics and the use of fiber-based endoscopes (FBEs) for non-intrusive and multi-perspective chemiluminescence imaging up to 20 kHz. Non-intrusive and full-field imaging measurements provide a wealth of information for model validation and design optimization of propulsion systems. However, it is challenging to obtain such measurements due to various implementation difficulties such as optical access, thermal management, and equipment cost. This work therefore explores the application of FBEs for non-intrusive imaging to supersonic propulsion systems. The FBEs used in this work are demonstrated to overcome many of the aforementioned difficulties and provided datasets from multiple angular positions up to 20 kHz in a supersonic combustor. The combustor operated on ethylene fuel at Mach 2 with an inlet stagnation temperature and pressure of approximately 640 degrees Fahrenheit and 70 psia, respectively. The imaging measurements were obtained from eight perspectives simultaneously, providing full-field datasets under such flow conditions for the first time, allowing the possibility of inferring multi-dimensional measurements. Due to the high speed and multi-perspective nature, such new diagnostic capability generates a large volume of data and calls for analysis algorithms that can process the data and extract key physics effectively. To extract the key combustion dynamics from the measurements, three mathematical methods were investigated in this work: Fourier analysis, proper orthogonal decomposition (POD), and wavelet analysis (WA). These algorithms were first demonstrated and tested on imaging measurements obtained from one perspective in a sub-sonic combustor (up to Mach 0.2). The results show that these algorithms are effective in extracting the key physics from large datasets, including the characteristic frequencies of flow—flame interactions especially during transient processes such as lean blow off and ignition. After these relatively simple tests and demonstrations, these algorithms were applied to process the measurements obtained from multi-perspective in the supersonic combustor. compared to past analyses (which have been limited to data obtained from one perspective only), the availability of data at multiple perspective provide further insights into the flame and flow structures in high speed flows. In summary, this work shows that high speed chemiluminescence is a simple yet powerful combustion diagnostic. Especially when combined with FBEs and the analyses algorithms described in this work, such diagnostics provide full-field imaging at high repetition rate in challenging flows. Based on such measurements, a wealth of information can be obtained from proper analysis algorithms, including characteristic frequency, dominating flame modes, and even multi-dimensional flame and flow structures. / Ph. D.

In this thesis we conduct a numerical study of the 1D viscous Burgers' equation and several Reduced Order Models (ROMs) over a range of parameter values. This study is motivated by the need for robust reduced order models that can be used both for design and control. Thus the model should first, allow for selection of optimal parameter values in a trade space and second, identify impacts from changes of parameter values that occur during development, production and sustainment of the designs. To facilitate this study we apply a Finite Element Method (FEM) and where applicable, the Group Finite Element Method (GFE) due its demonstrated stability and reduced complexity over the standard FEM. We also utilize Proper Orthogonal Decomposition (POD) as a model reduction technique and modifications of POD that include Global POD, and the sensitivity based modifications Extrapolated POD and Expanded POD. We then use a single baseline parameter in the parameter range to develop a ROM basis for each method above and investigate the error of each ROM method against a full order "truth" solution for the full parameter range. / Master of Science