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 89 for “"Second-Moment"”.
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Minimum-correction second-moment matching : theory, algorithms and applications
… a given U under the constraint that a prescribed second-moment matrix P̃ must be matched, i.e.Ũ[T superscript]Ũ . We obtain a closed-form formula for the unique global optimizer Ũ for the full-rank case, which is related to U by an SPD (symmetric positive definite) linear transform. This result is …
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Complexity and second moment of the mathematical theory of communication
The performance of an error correcting code is evaluated by its block error probability, code rate, and encoding and decoding complexity. The performance of a series of codes is evaluated by, as the block lengths approach infinity, whether their block error probabilities decay to zero, whether …
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A Basic Three-Dimensional Turbulent Boundary Layer Experiment To Test Second-Moment Closure Models
In this work, a three-dimensional turbulent boundary layer experiment was set up with alternating stream-wise and span-wise pressure gradients. The pressure gradients are generated as a result of the test section wavy side wall shape. Each side had six sine waves with a trough to peak magnitude to …
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Explicit Formula for the Mean Square of Dirichlet L-Functions to Prime Power Moduli
… primes are distributed, estimates such as power moments provide critical input about L-functions. We derive an explicit formula for the second moment in the family of Dirichlet L- functions to a prime power modulus. Motohashi derived explicit formulas for the second and fourth moments of the …
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A Methodology to Assess Data Variability and Risk in a Pavement Design System for Bangladesh.
… in this research utilizes the first order second moment theory and an analytical model based on the method of equivalent thickness. For the risk analysis of embankments the first order second moment method was also identified as suitable in the context. An integrated example of the proposed …
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A magnetic resonance study of the screening of electric fields in metals
… resonance or by a system composed of nuclear moments in local magnetic fields with additional weak quadrupole splittings. The two systems are weakly coupled together so that heat flows from one system to the other whenever there is a temperature imbalance. A cross relaxation time was …
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Confiabilidade de estruturas reticuladas em ambientes de processamento paralelo
ln this work application of the First Order Second Moment reliability theory was used to asses the nominal failure probability of framed structures. A elast-plastic limit state function to structural elements and specialists methods were used for this purpose. A method to identify the most likely …
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Conduction noise in sliding charge-density waves
… power spectra of these fluctuations (i.e. the second spectra), and their correlation functions all indicate that the ac signal accompanying CDW conduction is Gaussian noise. An important consequence of the Gaussian statistics is that the size of the conduction noise is completely characterized …
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Modeling Conditional Heteroskedasticity in Time Series and Spatial Analysis
… show the importance of modeling the conditional second moment in spatial context.
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Probability-based stability analysis of a laminated composite plate under combined in-plane loads
… plate are obtained by employing the first-order second-moment method of reliability analysis. Uncertainties associated with material mechanical properties and fiber orientations of individual layers are modeled as statistically independent random variables. Numerical results are presented for …
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Time Series Analysis of the A0 Supergiant HR 1040
… increases in Si II equivalent width and second moment, with the atmospheric changes indicated by the H¿¿ line lagging the photospheric changes seen in Si II by an interval of 13 to 23 days. The observed HVAs were found to be preceded by Si II radial velocity oscillations by an interval of …
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Image processing in echography and MRI
… ratio, co-occurrence<br/>matrix, asymmetric second moment, homodyned k-distribution and a proposed specklet<br/>detector. For left ventricle detection, template matching was used. Forvortex detection,<br/>a data processing framework is presented that consists of three main steps: …
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Modelling of turbulent swirling flows
… models are presented along with the LRR and SSG second-moment closure models for isothermal and variable density flows. The effect of anisotropy in the Reynolds stress dissipation rate tensor is accounted for by the inclusion of an algebraic model for the dissipation anistropy tensor dependent 0n …
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Reciprocity of Sight: The Rhetorics of Contestation and Commemoration on the National Mall
… commemoration. The dissertation takes up three moments in the history of the National Mall when negotiation about contestation and commemoration manifested as public conversations about the meaning of the National Mall. The first moment is the Senate Park Commission's Plan of 1900 and 1901, also …
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Reliability of reinforced concrete beams in torsion
… members is evaluated. Advanced first-order, second-moment reliability analysis is used to compute the reliability index. Reinforced concrete beams, subjected to both equilibrium and compatibility torsion, are analyzed. The uncertainties associated with the various torsion design parameters …
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System reliability optimization of aircraft wings
… the level III, and the advanced first order, second moment (AFOSM) method are employed to evaluate the probability of failure of each failure element of the system representing the wing. In the level III method the statistical correlation between failure modes is neglected. The AFOSM method …
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Proton magnetic resonance of wood and water in wood
… in the wood cell walls and lumens. A lineshape second moment study found the second moment of protons in oven dry wood to be about 23% lower than the rigid lattice calculation, indicating a rigid structure with some anisotropic molecular motion of the polymeric constituents. Above 5% moisture …
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Reliability-based design of a retaining wall
… were computed by using Advanced First Order Second Moment method. With the safety indices the probabilities of failure for the three limit states were calculated and the probabilistically optimized design could be achieved by using the probability of failure. The influence of the coefficient …
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