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 36 for “"Calculation-based"”.
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Sample Size Calculation Based on the Semiparametric Analysis of Short-term and Long-term Hazard Ratios
… is often used for the sample size and power calculation. With covariate adjustment, the approaches are often based on the score test statistic for the Cox proportional hazards model. Such methods, however, are inappropriate when the proportional hazards assumption is violated. We develop …
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Comprehensive Calculation-Based Imrt Qa Using R&V Data, Treatment Records, and A Second Treatment Planning System
… are labor intensive and consume machine time. Calculation-based IMRT QA methods typically are not comprehensive. We have developed a comprehensive calculation-based IMRT QA method to detect uncertainties introduced by the initial dose calculation, the data transfer through the Record-and-Verify …
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Neutron-neutron angular correlation in 252Cf spontaneous fission
… correlation is compared with a theoretical calculation based on the evaporation model of neutron emission. It is found that the evaporation model is unable to account for the observed strong peaking in the n-n angular correlation at small angles. Preliminary calculations show that two of the …
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An Agent-Based Model of the International Nuclear System
… I investigate this phenomenon using an Agent Based Model to represent the interactions among seven states and the four calculation-based attributes: cooperation, acquisition, proliferation, and use. Each state is affected differently by the actions of others and defined by a slightly different …
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Modeling Roughness of Rock Discontinuity Surfaces
… condition of roughness through the physically based modeling approach of signal analysis. The development of this method came about after investigation into the use of qualitative categorizations of roughness from the RMR rating system within rock engineering system matrices. In an attempt to …
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Vyšetření pacienta v ordinaci dentální hygienistky
… number 1 was not confirmed. According to the calculation based on the gathered data, the average patient examination time of dental hygienist is 9 minutes. The hypothesis number 2 was not confirmed. 89% of respondents check tongue and its base, but 66% of the respondents check only base of …
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A Multilevel Fast Multipole Algorithm for Analyzing Radiation and Scattering From Wire Antennas in a Complex Environment
… spectral integrals are derived for efficient calculation of the fringe capacitances, which contribute to the main differences of delta-gap and magnetic frill sources in high-frequency simulation. In addition, physics-based preconditioners and basis reduction schemes are developed to reduce …
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Math Games in Teaching Resources in Grade 1-6 Education in China and Canada
… study employs a qualitative research approach based on constructivist and social constructivist learning theories. Thematic analysis is used to examine the design and use of math games in China and Canada. This research shows that although there are more math games in Canada than in China, …
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Density functional theory study of adsorption of cronconate dyes on TiO2 Anatase (010) and (100) surfaces
… in this study by employing first principle calculation based on DFT using a plane-wave pseudo potential method. The generalized gradient approximation (GGA) was used in the scheme of Perdew-Burke Ernzerhof to describe the exchange -correlation function as implemented in the CASTEP package in …
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Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B->Xu l nu and an Improved Determination of the Quark-Mixing Matrix Element |V_ub|
… measured $\Delta \tilde{\BR}$ using theoretical calculation based on Heavy Quark Expansion. The result is $|V_{ub}| = (4.19 \pm 0.18{}^{+0.26}_{-0.20} {}^{+0.26}_{-0.25}) \times 10^{-3}, where the errors represent experimental uncertainties, uncertainties from HQE parameters and theoretical …
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Multi-Objective Design Optimization Considering Uncertainty in a Multi-Disciplinary Ship Synthesis Model
… quantified using a "confidence of success" (CoS) calculation based on the mean value method. CoS is the probability that a design will satisfy all constraints and meet performance objectives. This work proves that the CoS concept can be applied to synthesis models to estimate uncertainty early in …
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A Comparison of Control Methods for Spacecraft Maneuvering With Run Time Assurance
… controls field. Controllers designed using data-based approaches like artificial intelligence must uphold the same levels of safety expected from modern controllers, such as Linear Quadratic Regulators. This is accomplished with the application of Run Time Assurance, which ensures the system …
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A Comparison of Control Methods for Spacecraft Maneuvering With Run Time Assurance
… controls field. Controllers designed using data-based approaches like artificial intelligence must uphold the same levels of safety expected from modern controllers, such as Linear Quadratic Regulators. This is accomplished with the application of Run Time Assurance, which ensures the system …
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Isotope Investigation of Nitrate in Soils and Agricultural Drain Waters of the Lower Yakima Valley, Washington
… nearby Hanford Site, Washington. A mass balance calculation based on Δ<sup>17</sup>O data suggests that there is a ~9% atmospheric contribution to nitrate in soil accumulations below caliche layers at several locations. This atmospheric input was consistent across multiple sites. We argue that …
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Global EDF Scheduling for Parallel Real-Time Tasks
… test for GEDF; this test uses a carry-in work calculation based on the proof for the capacity bound. Finally, we present and evaluate a prototype platform --- called PGEDF --- for scheduling parallel tasks using GEDF. PGEDF is built by combining the GNU OpenMP runtime system and the LITMUS_RT …
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Material properties related to fire spalling of concrete
… fire exposure are presented. A verification calculation, based on the measured values of temperature in the cross-section of the fire exposed concrete, was compared with results from a full-scale fire test with the same concrete. Good correlation was obtained. Using a measurement system …
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Simultaneous chemical reaction and distillation of formaldehyde
… component system. The vapour-liquid equilibrium calculations were performed by solving iteratively the thermodynamic relationships expressing the phase equilibria with the stoichiometric equations expressing the chemical equilibria. Using optimisation techniques, the Wilson single parameters and …
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Gravity selector-enabled kenaf recirculation and reuse as a renewable ballasting agent for sludge settleability enhancement in a municipal wastewater secondary process: A real wastewater pilot-scale study
… This idea was tested by dosing kenaf, a plant-based renewable migrating carrier in a pilot-scale plug flow reactor equipped with a gravity selector to mimic a hydrocyclone. Results showed that kenaf could gradually reduce the sludge volume index from 170 to 50 mL/g and increase zone settling …
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Micromagnetic modelling of thin film media
… equation. The most time consuming calculation in the modelling process is the magnetostatic field calculation. Therefore, continuous research into more efficient methods of calculating this field is carried out. The model initially uses a dipole approximation to calculate the total …
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EFFICIENT SOLUTION METHODS FOR NONLINEAR FINITE ELEMENT ANALYSIS (DESIGN, GEOMETRIC MATERIAL, POST-BUCKLING, STRUCTURAL, MECHANICS, NUMERICAL).
… in the total Lagrangian formation are derived, based on continuum mechanics principles and by invoking the principle of virtual work. A general purpose computer program, modular in structure, and interactive in nature, is developed, based on the theoretical formulation presented. A brief review …
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