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 38 for “"two-step method."”.
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Development of a copper-catalyzed amidation-base-promoted cyclization sequence for the synthesis of 2-aryl- and 2-vinyl1-4 quinolones
A direct two-step method for the preparation of 2-aryl- and 2-vinyl-4-quinolones that utilizes a copper-catalyzed amidation of ortho-halophenones followed by a base-promoted Camps cyclization of the resulting N-(2-keto-aryl)amides is described. With Cul, a diamine ligand, and base as the catalyst …
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Uniqueness and Estimation of Three-Dimensional Motion Parameters of Rigid Objects
… is restricted to be planar, we show that given two image frames, one can determine uniquely eight "pure parameters" which are nonlinear functions of the actual motion parameters. There are two different ways to estimate these pure parameters. The first is the direct method and the second, …
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Simulation of temperature history and estimation of thermal properties of food materials during freezing
Freezing is a very common method of food preservation around the world. Accurate simulation of the freezing process in food materials is very important for the design of superior freezing processes and more efficient refrigeration equipment. The accuracy of numerical methods is very significant for …
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Two step runge-KUTTA-nystrom method for solving second-order ordinary differential equations
In this research, methods that will be able to solve the second order initial value problem (IVP) directly are developed. These methods are in the scheme of a multi-step method which is known as the two-step method. The two-step method has an advantage as it can estimate the solution with less …
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Evaluation of a direct time integration scheme for dynamic analysis
… trapezoidal rule. It is favored because it is a method that requires single steps and its results are second-order accurate. However, in cases where there are large deformations and longer integration times, the trapezoidal rule fails. A new composite method scheme shows promise in maintaining …
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Developing transition metal dichalcogenide alloys for applications to integrated photonics
… at temperature as low as 500 °C using a scalable two-step method of metal film deposition, followed by sulfurization in an H₂S gas furnace. We demonstrate different roughening processes for each case and optimize the morphology.
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Microneedles for Drug Delivery in Aquaculture
… environmental concerns from traditional fishing methods. However, a major challenge in aquaculture is the spread of disease from close quarters of the fish. Current fish vaccination methods include oral, immersion, and injection, with injection being the most effective but also the most …
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Expressions of psychological stress on Twitter: detection and characterisation
… a word-vector based word sense disambiguation method, the TensiStrength lexicon was modified to include the stress scores of the different senses of the same word. On a dataset of 1000 tweets containing ambiguous stress-related words, the accuracy of the modified TensiStrength increased by …
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Identification of Atomic Propositions in English Instructions for Flexible Translation to Robot Planning Representations
… In this thesis, we propose and implement a two-step method for identifying atomic propositions in a representation-agnostic way. Given an instruction in natural English, we first identify the spans of that instruction that may potentially be atomic propositions, and then carry out a …
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Using Stable Limit Cycles to Model p53-Mdm2 Protein Interactions in the Presence of DNA Damage
… loop, therefore preventing the binding of these two proteins, as a method to reactivate the p53 function is a promising cancer therapeutic strategy. To study the oscillatory behavior of p53 and Mdm2, several mathematical models have been developed. These models often only show oscillations for …
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Chemical Surface Modification of Polycarbonate to Increase Hydrophilicity
… air. Contact angles were taken using the sessile method on an optical tensiometer. Temperature, reaction time, concentration, solvent, and oxidation levels were varied to determine optimal reaction conditions. Using 0.01 wt% PPD at 80 ℃ for 2 hours, contact angles were reduced to 33°, but PPD dyed …
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Smooth regression quantile estimation
… of smoothing parameters. Chapter 2 studies two estimators, first a single-kernel estimator based on "check function" and a bandwidth selection rule is proposed based on the asymptotic MSE of this estimator. Second a recursive double-kernel estimator which extends Fan et al's (1996) density …
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Environmental Remediation Through Tailings Solvent Recovery Unit (TSRU) Waste: Synthesizing Activated Carbon-Zeolite (ACZ) Composites for Enhanced Carbon Dioxide Capture
… carbon-zeolite (ACZ) composite. In this thesis two different methods used for the synthetization of the ACZ composite. Where, two-step method (activation followed by hydrothermal synthetization) and fusion-assisted methods have been studied in this report. TSRU tailings waste contains quartz and …
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Rice straw fiber polymer composites: thermal and mechanical performance
… decomposition process of rice straw fibers. A method proposed by Málek, Šesták, and co-workers was used to investigate and model thermal decomposition process of common natural fibers with detailed analysis on rice straw system. Assuming a global model occurring within the entire degradation of …
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Photocrosslinkable polyimide and poly(imide siloxane) homo- and copolymers: synthesis and characterization
… The polyimides were synthesized by the classical two step method of first preparing soluble poly(amic acid) prepolymers by the reaction of various aromatic dianhydrides with aromatic diamines. The siloxane modified copolymers were synthesized by reacting single or mixed components of the aromatic …
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SERVICE LEARNING: AN INSTITUTIONAL LOGICS APPROACH
… and inclusion measures are introduced? A mixed method approach involving a two-step method of data collection and analysis was used in this study. Information from websites were used to create interview guidelines for interviews with faculty, administrators, and students at two US-based urban …
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Quantitative Analysis of Non-Linear Probabilistic State Estimation Filters for Deployment on Dynamic Unmanned Systems
… ultra-wide band (UWB) based communication network. This system functioned through statically situated beacon nodes used to localise a dynamically operating node. The simultaneous deployment of this UWB network, an unmanned system and a Robotic Total Station (RTS) with active and remote …
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An Analysis Of Shift Work: Compensating Differentials And Local Economic Conditions
… The model is estimated using both the lee two-step method and maximum likelihood. Two measures of local economic conditions, the local unemployment rate and the state leading index, are used. The models provide evidence that shift differentials and local economic conditions significantly …
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Detailed Population Balance Modelling of Titanium Dioxide Nanoparticle Synthesis
… in a lab-scale hot wall reactor is simulated. A two-step simulation methodology is presented to apply the model to a stagnation flame. The methodology extends an existing two-step method, where a detailed population balance model is applied as a post-processing step to flame profiles obtained …
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Data, models and decisions for large-scale stochastic optimization problems
… In the first chapter, we propose a new solution method for a general class of Markov decision processes (MDPs) called decomposable MDPs. We propose a novel linear optimization formulation that exploits the decomposable nature of the problem data to obtain a heuristic for the true problem. We show …
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