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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
161

Optical Parametric Amplification in Orientation-Patterned GaAs Waveguides

DeShano, Bradley R. 23 May 2016 (has links)
No description available.
162

QUASI-LINEAR DYNAMIC MODELS OF HYDRAULIC ENGINE MOUNT WITH FOCUS ON INTERFACIAL FORCE ESTIMATION

Yoon, Jongyun 07 October 2010 (has links)
No description available.
163

Discerning Harmonic Progressions in the First Movement of Zoltán Kodály's String Quartet No. 1, Op. 2 in C Minor (1910)

Ross, Martin 23 November 2015 (has links) (PDF)
Zoltán Kodály’s String Quartet No. 1 in C Minor is one of his earliest compositions. Kodály composed this as a tonal work, emulating the style used by nineteenth century composers. Kodály creates highly polyphonic textures and a complex harmonic language within the C minor tonality. Although this piece is considered tonal, Kodály deviates from the prototypical norms of tonal composition. As in most tonal music, harmonic progressions tend to support the overall tonal syntax. This includes chords, chord progressions, and key areas. The goal of this thesis is to categorize harmonic progressions in the first movement of Kodály’s String Quartet. In order for harmonic progressions to take place at the level of the chord, harmonic function must be present. I will break down the function of each chord by using Daniel Harrison’s scale degree theory from his book Harmonic Function in Chromatic Music. Some harmonic progressions follow a prototypical model that was utilized in common practice music. There are also chords in harmonic progressions that have an altered function—yet are still considered harmonic—which I will call “quasi-harmonic.” Lastly, some progressions are purely linear, and therefore the function is discerned on the macro level.
164

Quasi-Distributed Intrinsic Fabry-Perot Interferometric Fiber Sensor for Temperature and Strain Sensing

Huang, Zhengyu 23 March 2006 (has links)
The motivation of this research is to meet the growing demand for the measurand high-resolution, high-spatial resolution, attenuation insensitive and low-cost quasi-distributed temperature and strain sensors that can reliably work under harsh environment or in extended structures. There are two main drives for distributed fiber sensor research. The first is to lower cost-per-sensor so that the fiber sensors may become price-competitive against electrical sensors in order to gain widespread acceptance. The second is to obtain spatial distribution of the measurand. This dissertation presents detailed research on the design, modeling, analysis, system implementation, sensor fabrication, performance evaluation, sensor field test and noise analysis of a quasi-distributed intrinsic Fabry-Perot interferometric (IFPI) fiber sensor suitable for temperature and strain measurement. For the first time to our knowledge, an IFPI sensor using a different type of fiber spliced in between two single-mode fibers is proposed and tested. The proposed sensor has high measurement accuracy, excellent repeatability, a large working range and a low insertion-loss. It requests no annealing after the sensor is made, and the sensor is calibration-free. The sensor fabrication is low-cost and has a high yield rate. The goal for this research is to bring this sensor to a level where it will become commercially viable for quasi-distributed sensing applications. / Ph. D.
165

Channel Estimation Strategies for Coded MIMO Systems

Trepkowski, Rose E. 17 August 2004 (has links)
High transmission data rate, spectral efficiency, and reliability are necessary for future wireless communications systems. In a multipath-rich wireless channel, deploying multiple antennas at both the transmitter and receiver achieves high data rate, without increasing the total transmission power or bandwidth. When perfect knowledge of the wireless channel conditions is available at the receiver, the capacity has been shown to grow linearly with the number of antennas. However, the channel conditions must be estimated since perfect channel knowledge is never known a priori. In practice, the channel estimation procedure can be aided by transmitting pilot symbols that are known at the receiver. System performance depends on the quality of channel estimate, and the number of pilot symbols. It is desirable to limit the number of transmitted pilot symbols because pilot symbols reduce spectral efficiency. This thesis analyzes the system performance of coded multiple-input multiple-output (MIMO) systems for the quasi-static fading channel. The assumption that perfect channel knowledge is available at the receiver must be removed, in order to more accurately examine the system performance. Emphasis is placed on developing channel estimation strategies for an iterative Vertical Bell-Labs Layered Space Time (V-BLAST) architecture. The channel estimate can be sequentially improved between successive iterations of the iterative V-BLAST algorithm. For both the coded and uncoded systems, at high signal to noise ratio only a minimum number of pilot symbols per transmit antenna are required to achieve perfect channel knowledge performance. / Master of Science
166

Measuring the impact of specific activities to improve innovation capacity of teams in a German insurance company

Ter Haar, Philipp Jeroen 21 April 2020 (has links)
[ES] Fostering innovativeness in every team of a company is essential in order to stay competitive today. However, little is known about the real effect of measures to improve a team's innovativeness. The purpose of this dissertation is to test the impact of such measures to support human resource development. A mixed method triangulation research strategy was applied. Two approaches for measuring innovation performance were developed based on a structured literature review and qualitative expert interviews: One based on the idea of counting innovations along the steps of the innovation process (counting tool) and one which also integrates the value of the innovations into the assessment (valuing tool). A pretest-posttest control group design was used while conducting a quasi-experiment with 18 teams of a German insurance company. Findings were two-fold: On the one hand the validity of the counting tool to measure innovation performance of teams could be proven. Despite strongly correlating results this was not possible with regard to the valuing tool. On the other hand, they suggest a statistically significant effect of the measures on innovativeness, particularly implementing a pin board and providing employees with time for innovations can be recommended. The results provide a new perspective on measuring innovativeness and extends existing frameworks for future academic investigations. Additionally, it can be used by managers to invest in and select effective measures to improve the innovativeness of teams. / [CA] Fomentar la innovación en todos los equipos de una empresa es esencial para seguir siendo competitivo hoy en día. Sin embargo, se sabe poco sobre el efecto real de las medidas para mejorar la capacidad de innovación de un equipo. El propósito de este trabajo es probar el impacto de tales medidas para apoyar el desarrollo de los recursos humanos. Se aplicó una estrategia de investigación de triangulación con métodos mixtos. Se desarrollaron dos enfoques para medir el rendimiento de la innovación basados en una revisión estructurada de la literatura y en entrevistas cualitativas con expertos: Una basada en la idea de contar el número de las innovaciones a lo largo de los pasos del proceso de innovación (herramienta de recuento) y otra basada en la integración del valor de las innovaciones en la evaluación (herramienta de valoración). Se utilizó un diseño de grupo de control antes y después de la prueba mientras se realizaba un cuasi-experimento con 18 equipos de una compañía de seguros alemana. Los resultados fueron dobles: Por un lado, se pudo comprobar la validez de la herramienta de recuento para medir el rendimiento de innovación de los equipos. A pesar de la fuerte correlación de los resultados, esto no fue posible con respecto a la herramienta de valoración. Por otra parte, sugieren un efecto estadísticamente significativo de las medidas sobre la capacidad de innovación, en particular la implantación de un tablón de anuncios y la concesión de tiempo a los empleados para innovar. Los resultados proporcionan una nueva perspectiva para medir la capacidad de innovación y amplían los marcos existentes para futuras investigaciones académicas. Además, pueden ser utilizados por los directivos para invertir y seleccionar medidas eficaces para mejorar la capacidad de innovación de los equipos. / [EN] Fomentar la innovació en tots els equips d'una empresa és essencial per continuar sent competitiu avui en dia. No obstant això, se sap poc sobre l'efecte real de les mesures per a millorar la capacitat d'innovació d'un equip. El propòsit d'aquest treball és provar l'impacte d'aquestes mesures per donar suport al desenvolupament dels recursos humans. Es va aplicar una estratègia d'investigació de triangulació amb mètodes mixtes. Es van desenvolupar dos enfocaments per mesurar el rendiment de la innovació basats en una revisió estructurada de la literatura i en entrevistes qualitatives amb experts: Una basada en la idea de comptar el nombre de les innovacions al llarg dels passos del procés d'innovació (eina de recompte) i una altra basada en la integració del valor de les innovacions en l'avaluació (eina de valoració). Es va utilitzar un disseny de grup de control abans i després de la prova mentre es realitzava un quasi-experiment amb 18 equips d'una companyia d'assegurances alemanya. Els resultats van ser dobles: D'una banda, es va poder comprovar la validesa de l'eina de recompte per mesurar el rendiment d'innovació dels equips. Tot i la forta correlació dels resultats, això no va ser possible pel que fa a l'eina de valoració. D'altra banda, suggereixen un efecte estadísticament significatiu de les mesures sobre la capacitat d'innovació, en particular la implantació d'un tauler d'anuncis i la concessió de temps als empleats per innovar. Els resultats proporcionen una nova perspectiva per mesurar la capacitat d'innovació i amplien els marcs existents per a futures investigacions acadèmiques. A més, poden ser utilitzats pels directius per invertir i seleccionar mesures eficaces per millorar la capacitat d'innovació dels equips. / Ter Haar, PJ. (2020). Measuring the impact of specific activities to improve innovation capacity of teams in a German insurance company [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/141083
167

The validity of ipsative and quasi-ipsative forced-choice personality inventories for different occupational groups: a comprehensive meta-analysis

Salgado, J.F., Anderson, Neil, Tauriz, G. 2014 December 1917 (has links)
Yes / A comprehensive meta‐analysis of two types of forced‐choice (FC) personality inventories (ipsative and quasi‐ipsative) across nine occupational groups (Clerical, Customer Service, Health Care, Managerial, Military, Police, Sales, Skilled Manual, and Supervisory) is reported. Quasi‐ipsative measures showed substantially higher operational validity coefficients and validity generalization across all occupations than ipsative measures. Results also showed that, compared with the findings of previous meta‐analyses, quasi‐ipsative personality inventories are better predictors of job performance than previously thought and that operational validities for ipsative measures are notably congruent with past findings. We conclude that quasi‐ipsative scale formats are superior for predicting job performance for all occupational groups. Theoretical and practical implications of these findings for personnel selection are discussed in 4.4. / Ministry of Economy and Competitiveness. Grant Number: PSI2011‐27943. Leverhulme Trust. Grant Number: IN‐2012‐095
168

Applications quasiconformes et soudure conforme

Fortier Bourque, Maxime 16 April 2018 (has links)
Tableau d’honneur de la Faculté des études supérieures et postdoctorales, 2010-2011 / On expose les grandes lignes de la théorie des applications quasiconformes. On traite notamment en détail du théorème de Beurling-Ahlfors sur le prolongement à la frontière des homéomorphismes quasiconformes du demi-plan supérieur. On utilise ensuite ce résultat ainsi que le théorème d'existence et d'unicité de Morrey, également connu sous le nom de théorème de Riemann mesurable, pour démontrer le théorème fondamental de la soudure conforme. Ce dernier affirme que toute quasisymétrie de la droite réelle est la fonction soudante d'un quasidisque essentiellement unique. Finalement, on montre comment toutes ces idées sont reliées à travers l'espace de Teichmùller universel.
169

The quasi two-day wave

Fröhlich, Kristina, Jacobi, Christoph, Lange, Martin, Pogoreltsev, Alexander 05 January 2017 (has links) (PDF)
The quasi two-day wave (QTDW), a prominent feature of the mesosphere mainly around solstices, is simulated with the COMMA-LIM Model (Cologne Model of the Middle Atmosphere - Leipzig Institute for Meteorology). The calculations are made approximately one month after the summer solstice in the Northern Hemisphere when the QTDW reaches its maximum in the mesosphere and lower thermosphere. The results show that the QTDW produces a moderate westward forcing of the zonally averaged flow and a poleward driving of the residual mean meridional circulation. / Die Quasi Zwei-Tage Welle (QTDW), eine deutliche Erscheinung in der Mesosphäre kurz nach dem Sommer Solstitium, wird mit dem COMMA-LIM Modell (Cologne Model of the Middle Atmosphere - Leipzig Institute for Meteorology) simuliert. Die Zwei-Tage Welle wurde unter Juli-Bedingungen an der unteren Modellgrenze angeregt, zu der Zeit, zu der sie ihr Maximum in der Mesosphäre und unteren Thermosphäre erreicht. Die Ergebnisse zeigen eine sich westwärts ausbreitende Welle, die auf den Grundstrom eine moderate Beschleunigung nach Westen ausübt. Die residuelle mittlere Meridional Zirkulation erfährt dadurch eine zum Pol gerichtete Triebkraft.
170

Processus de Poisson généralisé autorégressif d'ordre 1

Najem, El-Halla January 2004 (has links)
Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

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