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 423 for “"sampling methods"”.
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Comparative particulate sampling methods
At present, there are several methods of determining the mass concentration of suspended particulate matter in ambient air. Most of these methods, including the EPA reference method, require manual filtering and weighing of the collected sample. This is both costly and time-consuming and is subject …
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Field comparison of groundwater sampling methods
Most ground-water sampling methods require the investigator to purge a large quantity of stagnant water from a well prior to collecting a sample. The use of in situ ground-water sampling devices which minimize or eliminate the need for purging would help to alleviate these problems. In this field …
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Sampling methods for case-crossover designs
Includes bibliographical references (page 40).
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Sampling Methods in Ray-Based Global Illumination
… are collectively known as Global Illumination methods. The most versatile of these are based on ray tracing (following ray paths through a scene), and numerical integration using random or quasi-random sampling. While ray tracing and sampling methods in global illumination have progressed much …
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Experience sampling methods (ESM) in organizations: a review
… of observations, response rates, recruitment methods and incentives, survey timing factors (study duration, signal frequency, times of day), signaling strategies and reminder technologies, survey media, survey items (number of items, item sampling, constructs measured), and analytic strategies …
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Sampling Methods for Fast and Versatile GNN Training
… training with sampled neighborhoods. Numerous sampling algorithms have emerged, some tailored for specific GNN applications. In this thesis, I explore ways to improve the efficiency and expressivity of existing and emerging sampling schemes. First, I explore system solutions to facilitate the …
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Cluster sampling methods for monitoring route-level transit ridership
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1991.
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Advanced Sampling Methods for Solving Large-Scale Inverse Problems
… and inverse problems. The majority of the methods in these two approaches are derived (at least implicitly) under the assumption that the underlying probability distributions are Gaussian. It is well accepted, however, that the Gaussianity assumption is too restrictive when applied to large …
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Efficient Sampling Methods for Forest Inventories and Growth Projections
… With time and costs constraints, appropriate sampling designs and models are required to perform the inventory efficiently, as well as to obtain reliable estimates for the variables needed to make projections. In this dissertation research, a simulation study was conducted to extensively …
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Towards More Efficient Enhanced Sampling Methods To Study Phase Transitions
… they can be applied. </p> <p>Current simulation methods used to accomplish this task, such as the grand canonical and Gibbs ensemble Monte Carlo methods, employ the concept of particles insertion and deletion moves or requires the knowledge of at least one point at coexistence. These types of …
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Developing aggregative soil sampling methods to improve preharvest produce safety
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Efficient Sampling Methods of, by, and for Stochastic Dynamical Systems
… tools for dynamical systems to create methods for efficient rare event simulation in nonlinear SDEs. Our approach exploits the relationship between the stochastic Koopman operator and the Kolmogorov backward equation to derive optimal importance sampling and multilevel splitting …
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Novel opposition-based sampling methods for efficiently solving challenging optimization problems
… problems, candidate initialization and sampling play a key role, but are not deeply investigated. It is of interest to know if the entire search space has the same quality for candidate-solutions during solving different type of optimization problems. In this thesis, a comprehensive …
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Comparative Phylogeography of Central African Duikers Using Non-invasive Sampling Methods
… African duikers (subfamily Cephalophinae). The sampling strategy consisted of collecting geo-referenced duiker feces across 43 sites and seven countries. However, several challenges related to the use of non-invasive samples needed to be addressed prior to large scale DNA amplification. First, …
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Spatial Allocation, Imputation, and Sampling Methods for Timber Product Output Data
… for Georgia were explored to determine new methods for handling missing data and finding suitable sampling estimators. Mean roundwood volume receipts per mill for the year 2003 were calculated using the methods developed by Rubin (1987). Mean receipts per mill ranged from 4.4 to 14.2 million …
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Evaluation and resolution of two sampling methods for airborne aromatic diisocyanate monomers
To view the abstract, please see the full text of the document.
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Enhancing Robustness of Neural Network Interatomic Potentials through Sampling Methods and Uncertainty Quantification
… costs compared to quantum mechanical methods. Without relying on predefined interaction parameters, NNIPs offers greater flexibility and adaptability than classical force fields, and can be used for atomistic simulations of complex materials and biological systems. However, NNIPs face …
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Population Characteristics and Sampling Methods of Catfish for the James and Big Sioux Rivers
… caught on modified circle hooks. The best sampling gears for collecting channel catfish in South Dakota rivers were soybean baited hoop nets, but for flathead catfish a combination of electro fishing and live baited trotlines was most effective. Catfish populations of both the Big Sioux and …
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DEVELOPMENT OF FECAL DNA SAMPLING METHODS TO ASSESS GENETIC POPULATION STRUCTURE OF GREATER YELLOWSTONE BISON
… herds. I evaluated the feasibility of fecal DNA sampling for genetic analyses of wild bison populations. I used matched blood and fecal samples from eight radio-collared bison from Hayden Valley breeding group (YNP), and multiplex polymerase chain reaction (PCR) of four microsatellite loci to …
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DEVELOPMENT OF FECAL DNA SAMPLING METHODS TO ASSESS GENETIC POPULATION STRUCTURE OF GREATER YELLOWSTONE BISON
… herds. I evaluated the feasibility of fecal DNA sampling for genetic analyses of wild bison populations. I used matched blood and fecal samples from eight radio-collared bison from Hayden Valley breeding group (YNP), and multiplex polymerase chain reaction (PCR) of four microsatellite loci to …
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