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 83 for “"Systematic Error"”.
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An evaluation of systematic error in the estimation of fish population size
Various estimation models and numerous sampling methods were used to estimate the size of a pumpkinseed sunfish (<i>Lepomis gibbosus</i>) population in a 1.16 hectare Virginia farm pond. After estimates were obtained, the pond was drained in order to compare estimated population size with actual …
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Study of Systematic Error in Biaxial Torque, and Magnetic Characterization of Strontium Ferrite
Magnetic anisotropy (MA) describes how the magnetic properties of materials, such as ferri- and ferromagnetic thin films and composites, change with the field angle. To determine a sample’s magnetic anisotropy constant, torque curves are used, obtained either directly with a torque magnetometer …
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Companion dog nutrition epidemiology
… is that statisticians are concerned with random error, while epidemiologists are concerned with systematic error." The purpose of this thesis is to identify common causes of systematic error in canine nutrition research, especially studies conducted in large populations of dogs, to exemplify such …
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Error analysis for distributed fibre optic sensing technology based on Brillouin scattering
This dissertation describes the work conducted on error analysis for Brillouin Optical Time Domain Reflectometry (BOTDR), a distributed strain sensing technology used for monitoring the structural performance of infrastructures. Although BOTDR has been recently applied to many infrastructure …
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Polarization in neutron-proton elastic scattering at 21.6 MEV
… so as to minimise perceived sources of systematic error. These included improvements both in instrumental design and data reduction techniques.
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A two-ion balance for high precision mass spectrometry
… (e.g. of the magnetic field). To minimize the systematic error associated with the Coulomb interaction between the two ions, we keep them about 1 mm apart from each other, on a common magnetron orbit. We have developed novel techniques to measure and control all three normal modes of motion of …
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Indirect measurement of the electrocaloric effect
… a thermometer). However, there was no obvious systematic error: sometimes the indirect temperature change was larger and sometimes smaller. The discrepancies were beyond the experimental errors. The majority of the present thesis is dedicated to careful reexamination of some of the assumptions …
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A kinematic-coupling-based adaptive fixture for high precision positioning applications in flexible manufacturing systems
… Given the many sources of time variable errors in fixture alignment (i.e. thermal, load, vibration), the integration of actuators and sensors within fixtures will be necessary to achieve real-time error compensation. This thesis examines the fundamental issues and design challenges …
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A measurement of the mean life of the positive muon to a precision of 11 parts per million
… experimental procedure, data analysis, and systematic error analysis for this measurement.
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The effect of differential color refraction on astrometric observations of Solar System bodies and Earth satellites from ground-based optical telescopes
… from ground-based optical telescopes to systematic bias from differential color refraction (DCR). This bias is evident in Minor Planet Center observations of asteroids with known spectral types and in observations of GPS and GLONASS satellites. DCR bias is on the order of 0.1 arcsec, and …
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Reproducing the line-shape of a Doppler-broadened Gamma-line in 10Be following the beta-decay of 11Li using Geant4
… to be 991 fs, well within statistical error of the value published in \cite{mattoon2009}: 983 $\pm 27$(stat.) $^{+200}_{-120}$(syst.) fs. Using G4 for simulating DSAM allows easy access to several pre-existing energy loss models. The results of DSAM are very sensitive to the energy loss …
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An Experimental Investigation of Thermal Boundary Layer Structure and Heat Transfer in Oscillating Flows Using CARS Spectroscopy and Cold -Wire Anemometry
… to CARS, at the expense of an ambiguous, systematic error associated with the intrusive nature of the probe. The cold-wire technique is used to investigate oscillating boundary layer flows with differing degrees of periodic flow reversal. Local, time-averaged Nusselt number results for the …
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Optimum experimental designs for models with a skewed error distribution: with an application to stochastic frontier models
… for a statistical model possessing a skewed error distribution are considered, with particular interest in investigating possible parameter dependence of the optimum designs. The skewness in the distribution of the error arises from its assumed structure. The error consists of two components …
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Search for the onset of color transparency through neutral rho meson electroproduction on nuclei
… different targets simultaneously to reduce the systematic error and achieve a more precise measurement.The Nuclear Transparency was measured as a function of Q2 and Coherence Length (l c), and was found to be independent of the (l c on the range scanned in the experiment. The increase in Nuclear …
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A Validation Study: Fitbit Charge 2 Heart Rate Measurement at Rest and During Cognitive-Emotional Stressors
… HR underestimated ECG HR as indicated by a mean error bias = -1.1 bpm (95% limits of agreement, -5.62 to 3.42), mean absolute percentage error 1.34 (SD = 1.85) %. Bland-Altman limits of agreement plot indicated minimal systematic error in the measurement range of 54 bpm to 117 bpm. When compared …
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Production of K+K - and ppbar pairs in high energy photoproduction
… to be 8.0 ± 2.8 nb/nucleon, with an additional systematic error of 16%. Measurements are made of its production characteristics. The most probable interpretation of this state is a radial excitation of the phi, or phi-prime. Production of ppbar pairs is measured. The ppbar mass spectrum displays …
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Integration of VMC++ into a Commercial Treatment Planning System
… without introducing a significant amount of systematic error. Also, independent validation of VMC++ for photon beams is of interest since this has not been performed previously in literature. This study included several tests required to integrate VMC++. Output factor normalization was …
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Measurement Of Neutron Radius In Lead By Parity Violating Scattering Flash ADC DAQ
… the upgrade of Moller polarimetery to reduce the systematic error for PREx. The hardware setup and the results of the FADC DAQ analysis are presented.</p>
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Online Raman spectroscopy for bioprocess monitoring
… to determine sources of instability and systematic error. A complete first-order error analysis was conducted to determine the theoretical sensitivity of the instrument. A suite of improvements and new features, including an online estimation of optical density and biomass, a method to …
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Stability enhancement of atomic timekeeping using Raman adiabatic rapid passage
… atoms. However, this method suffers from serious systematic error sources, e.g., AC Stark shift and Zeeman shift, which alter the atomic resonance frequency. A new method based on adiabatic rapid passage (ARP) has been recently demonstrated at Draper which has significantly reduced phase …
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