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 226 for “"drifts"”.
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Shallow Hydrogeology of Glacial Drifts in Northeastern Illinois
Made available in DSpace on 2014-12-09T20:34:25Z (GMT). No. of bitstreams: 1 6612454.pdf: 5413348 bytes, checksum: c3ebb62a0db2980a342fc640c31b67e8 (MD5) Previous issue date: 1966
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Towards Estimating Friction Factors of Mine Drifts from Low Density Point Clouds
The standard for estimating roughness for the purposes of underground mine ventilation planning is to choose values found in a variety of textbooks that attempt to match the excavation type. These values are then used in the Atkinson equation made popular in 1935 by McElroy to determine pressure …
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A Study on Several Radar Techniques Used for the Estimation of Ionospheric Plasma Drifts
… between the two methods. The 3-m irregularity drifts are also found to be in good accord with the bulk plasma motion during spread-F events.
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Cenozoic Variations in the Deep Western Boundary Current as Recorded in the Seismic Stratigraphy of Contourite Drifts, Newfoundland Ridge, Offshore Canada
A contourite drift complex on the J-Anomaly Ridge (JAR) and Southeast Newfoundland Ridge (SENR), offshore eastern Canada, records an extensive archive of North Atlantic circulatory and sedimentary dynamics formed under the influence of the Deep Western Boundary Current (DWBC). Seismic-reflection …
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Non-destructive analysis of popular cigarette brands utilizing attenuated total reflectance (ATR) and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) and chemometrics
… Fourier Transform Infrared Spectroscopy (DRIFTS) and transmission FTIR. When combined with chemometrics, a mathematical approach to finding similarities and differences among samples, infrared analysis can be used to distinguish between samples and classify unknowns. This research explores …
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On some aspects of portfolio management
… of the parameters that are in our case drifts and volatilities. We present some procedures to estimate the parameters dynamically. The problem of estimating drifts is inherently very hard as the noise (volatility) overwhelms the drifts. Volatilities are easier to estimate than the drifts …
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Online ensemble learning in the presence of concept drift
… of why they can be helpful for dealing with drifts and which of their features can contribute for that. The thesis mainly investigates how ensemble diversity affects accuracy in online learning in the presence of concept drift and how to use diversity in order to improve accuracy in changing …
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Investigation of the Winds and Electron Concentration Variability in the D Region of the Ionosphere by the Partial-Reflection Radar Technique
… and first observations of the partial-reflection drifts experiment at Urbana, Illinois (40(DEGREES)N) are described. The winds data from the drifts experiment are compared with electron concentration data obtained by the differential-absorption technique to study the possible meteorological causes …
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Lithium pellet injection into high pressure magnetically confined plasmas
… Significant differences appeared in the filament drifts in RF heated H-mode plasmas compared to ohmic L-mode plasmas. Filaments in ohmic L-mode plasmas moved in both the electron and ion diamagnetic directions while filaments in H-mode move only in the electron diamagnetic direction. Furthermore, …
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Thermo-analytical and spectroscopic characterisation of pore lining minerals in reservoir rocks.
… Infrared Fourier Transform Spectroscopy (DRIFTS) to distinguish the constituent minerals of a reservoir rock using characteristic bands in their vibrational spectra. Spectra collected from reservoir rocks that have undergone various sample preparations have shown that the spectra are …
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Forensic Discrimination, Age Estimation, and Spectral Optimization For Trace Detection of Blood On Textile Substrates Using Infrared Spectroscopy and Chemometrics
… infrared Fourier transform spectroscopy (DRIFTS). Reflectance spectra of bloodstains contain distinctive amide bands due to the proteins in blood. Amide I, II, and III bands (1650, 1540, and 1200-1350 cm<sup>-1</sup> respectively) were used to differentiate between neat and blood-doped …
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Effect of ceria and zirconia on nanoparticulate rhodium catalysts
… Infrared Fourier Transform Spectroscopy (DRIFTS), Mass Spectrometry (MS) and Energy Dispersive X-ray Absorption Fine Structure (EDE) techniques in a synchronous, time-resolved manner has been applied to determine the complementary information about structural and kinetic changes of the …
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New probabilistic approaches for detecting and evaluating concept drift in data streams
… distribution-based approaches may miss subtle drifts or respond to non-critical changes (virtual drift), while performance-based methods, which detect shifts impacting model accuracy (real drift), can overreact to transient noise, leading to unnecessary adaptations. These challenges underscore …
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Seismic Response of Short Period Structures and the Development of a Self-Centering Truss Moment Frame with Energy Dissipating Elements for Improved Performance
… displacement concept, which states that peak drifts for an inelastic system will be approximately equal to the peak drifts of an elastic system with the same initial stiffness for a given dynamic loading. This is a concept that has been shown to work for structures with natural period greater …
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Quantification of swelling clays in mineral mixtures and rocks using infrared spectroscopy.
… infrared Fourier transform spectroscopy (DRIFTS) was developed for the quantification of minerals in synthetic mixtures and sandstone rocks. Particular emphasis was directed towards quantifying swelling clays since the proportion of swelling minerals present in a reservoir rock influence …
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Glacial geology of northern Logan County, south-central North Dakota
… sandstone, and mudstone, and by three surface drifts, the Napoleon (lower part of the Wisconsin Stage), the Long Lake, and the Burnstad (upper part of the Wisconsin Stage) Drifts.</p> <p>Landforms of the area southwest of the Coteau include ground moraine, outwash plains, outwash topography of …
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A comparative study on the seismic performance of concrete and steel Diagrid structures
… in terms of natural period and controlling top drifts while concrete was tested to be better at controlling top accelerations. Comparing to outrigger and moment frame systems, both concrete and steel Diagrid structures were tested to be stiffer and more effective in restraining top drifts but …
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Seismic Response of Low -Rise Shear Wall Structures With Flexible Diaphragms
… to more accurately estimate peak interstory drifts that account for higher mode effects are described for low-rise perimeter shear wall structures. The proposed methods are based on the principal modes obtained from a principal components analysis (PCA) of computed inelastic dynamic …
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