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.
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Showing 1 to 20 of 48 for “"second mode"”.
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Seismic Design and Evaluation of Multistory Buildings Using Yield Point Spectra
… shapes of the building based on the first mode shape and combinations of the first and second mode shapes.
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Secondary instabilities of boundary layers
… plate is investigated using the resonant triad model and the Floquet model. The primary wave is taken in the form of a two-dimensional (2-0) Tollmien-Schlichting (T-S) wave. The subharmonic wave is taken in the form of a three-dimensional (3-D) wave. Results from both models are presented and …
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Observations of ocean fluctuations between 15 and 23 hour periods in the Pacific
… which are caused by barotropic (or first or second mode baroclinic) flu ctuations in the ocean. It is shown that these fluctuations cannot be local processes isolated to either the source or to the receivers. It is further shown that resonant barotropic gravity wave modes (Platzman et al., …
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Photolysis of (Halomethyl)naphthalenes: An Investigation of the Heterolysis and Homolysis of Carbon-Halogen Bonds in (Arylmethyl)halides
… spectroscopy. Evidence is presented for three modes of heterolytic bond cleavage. The first originates from an excited singlet state, and may be direct or may involve an exciplex formed during sensitization. The second mode is through an exciplex of the (halomethyl)naphthalene and a triplet …
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Description and Dynamics of 50-Day Oscillations in the Western Tropical Region of the CME Model
<p>The WOCE Community Modelling Effort (CME) general circulation model of the north Atlantic was used to investigate the behavior, nature and dynamics of 50-day oscillations seen in the meridional component of velocity between 35° and 55°W and between 5° and 11°N. Validation studies showed that the …
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Effect of suction and cooling on the stability of subsonic and supersonic boundary layers
… and reduces the optimum wall temperature. Second, the effect of suction on the stability of compressible flows over backward-facing steps is investigated. Mach numbers up to 0.8 are considered. As expected, suction considerably reduces the separation region. The results show that continuous …
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Numerical Investigation of Crossflow Instability on the HIFiRE-5
… Analysis Code (LASTRAC) on a 38.1% scale model of the HIFiRE-5 elliptic-cone forebody to study crossflow-induced transition in hypersonic boundary layers. A resolution study consisting of three grids (30e6, 45e6, and 91e6 points) indicated that the fine grid was sufficiently resolved. …
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Modeling and Analysis of Micro -End Milling Dynamics
… milling. Experimental validation of the model has been performed, and the model is shown to predict cutting forces and micro-end mill deflections within an average of 15%. Effects of process faults on micro-end mill vibrations have been studied varying feedrates for which the cutting …
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Probability of derailment under earthquake conditions
… conditions is presented. Two derailment modes are considered: by vibratory motion - during the ground motion - and by permanent track deformation - after the motion ended. Criteria for derailment that apply to both modes are derived in terms of peak transversal acceleration and peak …
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Photoinduced, refractive-index gratings in germanium-doped two-mode, elliptical-core optical fibers
… the longitudinal axis of germanium-doped, two-mode, elliptical-core fibers are found to affect the differential phase modulation between the co-propagating LP₀₁ and LP₁₁ even modes. The modal beat length of a two-mode fiber grating is found to vary inversely with strain induced to the fiber and …
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Passive motion control of super tall buildings : tuned mass and viscous dampers in Taipei 101.
… performance of the two damping schemes. It was modeled in a two-dimensional scheme in SAP2000 and a TMD was placed on its top to study its effect on the structural response due to wind and seismic excitations and confirm with the actual results. A sensitivity study was then performed to study …
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Making Art Work: A Pragmaticistic Interpretation of Art
… of interpretations of a work of art. The first mode is the aesthetic interpretation that focuses on the quality or the degree of feeling of unique presence. The second mode is the semiotic interpretation that focuses on the sign function of a work of art. The aesthetic interpretation is founded …
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The Preparation and Properties of Silicon-Carbohydrate Compounds
… of the type (CHy)4Si which might serve as models for natural silicon derivatives. Two main modes of approach to these syntheses were followed. The first was to react unprotected monosaccharides with new and modified silylating agents, the second mode involved the reaction of protected …
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Supply chain coordination and influenza vaccination
… yield issues. In this thesis we present two models in the interface of operations and supply chain management and public health policy. In the first model, we focus on a supply chain with a government and a manufacturer. We show that production risks, taken currently by the vaccine …
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Design of, and initial experiments with, a MIMO plate control testbed
… actuator and sensor materials and architecture, modeling approaches and requirements, and initial control experiments. The piezoelectric sensors and actuators are arranged on the plate to control the first five vibration modes. The sensors measure plate positions using a high impedance signal …
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Generating Low-Pressure Shock Waves for Calibrating High-Frequency Pressure Sensors
Measurements of hypersonic boundary-layer instabilities have recently been performed
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Summer sea surface temperature variability off Vancouver Island from satellite data, 1984-1991
… summer images was performed. The first EOF mode, which resembled the mean of all images, showed a strong cool water band located at the northwest corner of Vancouver Island, a cool tongue extending seaward from the Strait of Juan de Fuca and a warm patch off Barkley Sound. The second mode …
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MIT Skywalker : a novel robot for gait rehabilitation of stroke and cerebral palsy patients
… gaits. It can operate in three unique modes. The first promotes the rhythmicity of walking by removing the floor constraint during the swing phase of walking. The second mode fosters discrete start and stop movements and focuses on the accuracy of heel placement. Finally, a balance …
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Bayesian Belief Network (BBN)-based advisory system development for steam generator replacement project management
… Belief Network (BBN) approach was selected to model the steam generator replacement proj ect management problem, where the situation holds inherently large uncertainty and complexities, since it has a superior ability to treat complexities, uncertainty management, systematic decision making, …
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On the development of computer code for aircraft flight dynamics analysis
… of the aircraft can be evaluated in two flight modes: longitudinal stability analysis and the lateral – directional stability analysis. The present work focused on the second mode of flight. The stability analysis carried out by evaluates the behavior of three flight parameters if their aircraft …
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