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 39 for “"Loss models"”.
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A comparison of ASTRAL and RAYMODE propagation loss models and their use in air ASW platforms
… will entail the installation of propagation loss models on ASW aircraft. The decision to put either a range dependent or range independent model in the system will affect the predic
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Yield Loss Models for Foliar Diseases of Alfalfa and Evaluation of Chemical and Cultural Disease Control Methods
Regression models relating various measures of disease level to yield were developed for the complex of fungi which cause foliar disease on alfalfa (Medicago sativa). The accuracy and precision of the models was evaluated using data other than those from which the models were constructed. Linear …
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Finite kinematics in radiative energy loss
… implemented in sophisticated QCD-based energy loss models, but that the exact large-x kinematics in the toy theory are more complicated than those implemented in those same QCD-based energy loss models. We compute the differential cross-section for various values of the parent parton energy and …
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Flow losses in supersonic compressor cascades
Loss models used in compression system performance prediction codes are often developed from the study of two-dimensional cascades. The physical mechanisms that affect the flow in supersonic compressor cascades have been reviewed, including the changes in shock geometry that will occur with back …
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Design and Numerical Evaluation of a Counter- Rotating Compressor in the Absence of Boundary Layer Control: Part I
… design move forward and more accurate flow and loss models were used. The final three dimensional analysis, which was limited to the individual blade analysis, predicted pressure ratios of 2.26 and 1.60 for the second and third stage rotors at 0.91 and 0.85 adiabatic efficiencies. Stator blade …
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Investigation of Aerodynamic Profile Losses for a Low-Reaction Steam Turbine Blade
… refinement of a proprietary empirical profile loss model. A review of the literature shows that experimental data on this type of blade is not openly available. The continued efficacy of empirical loss models to low-reaction steam turbine blades requires data from experiments such as the …
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Development of a Methodology for Virtual Efficiency Evaluation of Electric Drive Modules
… on the mechanical characteristics, i.e, the loss that arises in the reduction unit needed to adapt the Electric Motor (EM) characteristics to the vehicle requirements that are commonly split into load losses and non-load losses, depending on their variability with the applied torque. Two …
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An interactive site modeling tool for estimating coverage regions for wireless communication systems in multifloored indoor environments
… interprets the floor plan and uses simple path loss models to estimate coverage regions for each transceiver. These regions are highlighted, enabling the user to assess the total coverage. This thesis describes the methodology used to compute the coverage regions for multifloored buildings. The …
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Investigation of the Time-Dependent Longitudinal Flexural Behavior of the Varina-Enon Bridge
… The accurate estimation of this prestress loss is vital for making good decisions about the remaining capacity of a structure and the infrastructure system at large. The Varina-Enon Bridge is a post-tensioned concrete box-girder bridge in Richmond Virginia. Cracks in the bridge prompted an …
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Determination of a Simplified High-Order Vortex Equation for Radial Equilibrium with CFD Verification
… simple radial equilibrium vortex models into a higher order equation that will establish the basis for a more flow-accurate model. In this paper, we will discuss the basis and derivation of these vortex models, the shortcomings of current techniques, and verification of the new …
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Indoor Propagation Modeling at 2.4 GHz for IEEE 802.11 Networks
… out inside two different buildings. Then, path loss exponents from log-distance path loss model and standard deviations from log-normal shadowing, which statistically describe the path loss models for a different transmitter receiver separations and scenarios, are determined. The purpose of this …
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Energy loss and theoretical uncertainties in small quark-gluon plasmas
… is to systematically improve current energy loss models, particularly in how they pertain to small systems. We present a perturbative Quantum Chromodynamics (pQCD) based energy loss model which receives small system size corrections to both the radiative and elastic energy loss, and which …
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INCREASING LONG TERM WEIGHT LOSS SUCCESS: AN INDIVIDUALIZED, HOLISTIC, SELF-CARE MODEL
<p>Despite the many weight loss options available, the majority of overweight and obese individuals who try to lose or maintain weight loss are unsuccessful. This lack of success has been the focus of extensive research. In an attempt to develop more effective modalities, researchers have …
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An Antenna Specific Site Modeling Tool for Interactive Computation of Coverage Regions for Indoor Wireless Communication
… floor plan, the system uses simple path-loss models to predict coverage regions for each transceiver. The coverage regions are highlighted to indicate expected coverage. Earlier work assumed isotropic transceivers and had limited directional transmitter support. This thesis describes how …
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Accurate range free localization in multi-hop wireless sensor networks
… established corresponding to the channel path-loss models in which the noise is mostly expected to shadow Gaussian distributions. In this thesis, we signify the applied additive noise by the Gaussian mixture model and improve a localization algorithm depend on the received signal intensity to …
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The Evolution of Massive Stars: The Influence of Initial Composition and Mass Loss
… stars with Y = 0.28, Z = 0.0002. These models have been evolved through core helium burning up to the point of carbon ignition. All models were evolved with and without the inclusion of mass loss. We have used a moderate mass loss rate with different efficiency factors for main sequence …
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Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak
… is the major contributor of transmission loss in the ocean. In shallow water, available propagation paths most often include bottom interaction. Perturbations in the ocean sound speed field can cause changes in the angle of incidence of sound rays with the bottom, which can result in …
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Modeling of Industrial Air Compressor System Energy Consumption and Effectiveness of Various Energy Saving on the System
… thermodynamic approach. Furthermore, pressure loss models of individual components along with pipe friction loss were included in the system overall efficiency calculation. The efficiency analysis methods and effectiveness approach discussed in this study were used to optimize energy …
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Improving Bluetooth-based Indoor Positioning Using Vision and Artificial Networks
… This thesis presents methods to compensate for losses in the RSSI values by applying ANN algorithms to RSSI measurements from three BLE advertising channels. The resulting improved RSSI values are then converted into ranges using path loss models and trilateration is applied to obtain indoor …
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Environmental analysis and prediction of transmission loss in the region of the New England Shelfbreak
… is the major contributor of transmission loss in the ocean. In shallow water, available propagation paths most often include bottom interaction. Perturbations in the ocean sound speed field can cause changes in the angle of incidence of sound rays with the bottom, which can result in …
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